Merge tag 'pci-v6.18-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci

Pull pci updates from Bjorn Helgaas:
"Enumeration:

- Add PCI_FIND_NEXT_CAP() and PCI_FIND_NEXT_EXT_CAP() macros that
take config space accessor functions.

Implement pci_find_capability(), pci_find_ext_capability(), and
dwc, dwc endpoint, and cadence capability search interfaces with
them (Hans Zhang)

- Leave parent unit address 0 in 'interrupt-map' so that when we
build devicetree nodes to describe PCI functions that contain
multiple peripherals, we can build this property even when
interrupt controllers lack 'reg' properties (Lorenzo Pieralisi)

- Add a Xeon 6 quirk to disable Extended Tags and limit Max Read
Request Size to 128B to avoid a performance issue (Ilpo Järvinen)

- Add sysfs 'serial_number' file to expose the Device Serial Number
(Matthew Wood)

- Fix pci_acpi_preserve_config() memory leak (Nirmoy Das)

Resource management:

- Align m68k pcibios_enable_device() with other arches (Ilpo
Järvinen)

- Remove sparc pcibios_enable_device() implementations that don't do
anything beyond what pci_enable_resources() does (Ilpo Järvinen)

- Remove mips pcibios_enable_resources() and use
pci_enable_resources() instead (Ilpo Järvinen)

- Clean up bridge window sizing and assignment (Ilpo Järvinen),
including:

- Leave non-claimed bridge windows disabled

- Enable bridges even if a window wasn't assigned because not all
windows are required by downstream devices

- Preserve bridge window type when releasing the resource, since
the type is needed for reassignment

- Consolidate selection of bridge windows into two new
interfaces, pbus_select_window() and
pbus_select_window_for_type(), so this is done consistently

- Compute bridge window start and end earlier to avoid logging
stale information

MSI:

- Add quirk to disable MSI on RDC PCI to PCIe bridges (Marcos Del Sol
Vives)

Error handling:

- Align AER with EEH by allowing drivers to request a Bus Reset on
Non-Fatal Errors (in addition to the reset on Fatal Errors that we
already do) (Lukas Wunner)

- If error recovery fails, emit FAILED_RECOVERY uevents for the
devices, not for the bridge leading to them.

This makes them correspond to BEGIN_RECOVERY uevents (Lukas Wunner)

- Align AER with EEH by calling err_handler.error_detected()
callbacks to notify drivers if error recovery fails (Lukas Wunner)

- Align AER with EEH by restoring device error_state to
pci_channel_io_normal before the err_handler.slot_reset() callback.

This is earlier than before the err_handler.resume() callback
(Lukas Wunner)

- Emit a BEGIN_RECOVERY uevent when driver's
err_handler.error_detected() requests a reset, as well as when it
says recovery is complete or can be done without a reset (Niklas
Schnelle)

- Align s390 with AER and EEH by emitting uevents during error
recovery (Niklas Schnelle)

- Align EEH with AER and s390 by emitting BEGIN_RECOVERY,
SUCCESSFUL_RECOVERY, or FAILED_RECOVERY uevents depending on the
result of err_handler.error_detected() (Niklas Schnelle)

- Fix a NULL pointer dereference in aer_ratelimit() when ACPI GHES
error information identifies a device without an AER Capability
(Breno Leitao)

- Update error decoding and TLP Log printing for new errors in
current PCIe base spec (Lukas Wunner)

- Update error recovery documentation to match the current code
and use consistent nomenclature (Lukas Wunner)

ASPM:

- Enable all ClockPM and ASPM states for devicetree platforms, since
there's typically no firmware that enables ASPM

This is a risky change that may uncover hardware or configuration
defects at boot-time rather than when users enable ASPM via sysfs
later. Booting with "pcie_aspm=off" prevents this enabling
(Manivannan Sadhasivam)

- Remove the qcom code that enabled ASPM (Manivannan Sadhasivam)

Power management:

- If a device has already been disconnected, e.g., by a hotplug
removal, don't bother trying to resume it to D0 when detaching the
driver.

This avoids annoying "Unable to change power state from D3cold to
D0" messages (Mario Limonciello)

- Ensure devices are powered up before config reads for
'max_link_width', 'current_link_speed', 'current_link_width',
'secondary_bus_number', and 'subordinate_bus_number' sysfs files.

This prevents using invalid data (~0) in drivers or lspci and,
depending on how the PCIe controller reports errors, may avoid
error interrupts or crashes (Brian Norris)

Virtualization:

- Add rescan/remove locking when enabling/disabling SR-IOV, which
avoids list corruption on s390, where disabling SR-IOV also
generates hotplug events (Niklas Schnelle)

Peer-to-peer DMA:

- Free struct p2p_pgmap, not a member within it, in the
pci_p2pdma_add_resource() error path (Sungho Kim)

Endpoint framework:

- Document sysfs interface for BAR assignment of vNTB endpoint
functions (Jerome Brunet)

- Fix array underflow in endpoint BAR test case (Dan Carpenter)

- Skip endpoint IRQ test if the IRQ is out of range to avoid false
errors (Christian Bruel)

- Fix endpoint test case for controllers with fixed-size BARs smaller
than requested by the test (Marek Vasut)

- Restore inbound translation when disabling doorbell so the endpoint
doorbell test case can be run more than once (Niklas Cassel)

- Avoid a NULL pointer dereference when releasing DMA channels in
endpoint DMA test case (Shin'ichiro Kawasaki)

- Convert tegra194 interrupt number to MSI vector to fix endpoint
Kselftest MSI_TEST test case (Niklas Cassel)

- Reset tegra194 BARs when running in endpoint mode so the BAR tests
don't overwrite the ATU settings in BAR4 (Niklas Cassel)

- Handle errors in tegra194 BPMP transactions so we don't mistakenly
skip future PERST# assertion (Vidya Sagar)

AMD MDB PCIe controller driver:

- Update DT binding example to separate PERST# to a Root Port stanza
to make multiple Root Ports possible in the future (Sai Krishna
Musham)

- Add driver support for PERST# being described in a Root Port
stanza, falling back to the host bridge if not found there (Sai
Krishna Musham)

Freescale i.MX6 PCIe controller driver:

- Enable the 3.3V Vaux supply if available so devices can request
wakeup with either Beacon or WAKE# (Richard Zhu)

MediaTek PCIe Gen3 controller driver:

- Add optional sys clock ready time setting to avoid sys_clk_rdy
signal glitching in MT6991 and MT8196 (AngeloGioacchino Del Regno)

- Add DT binding and driver support for MT6991 and MT8196
(AngeloGioacchino Del Regno)

NVIDIA Tegra PCIe controller driver:

- When asserting PERST#, disable the controller instead of mistakenly
disabling the PLL twice (Nagarjuna Kristam)

- Convert struct tegra_msi mask_lock to raw spinlock to avoid a lock
nesting error (Marek Vasut)

Qualcomm PCIe controller driver:

- Select PCI Power Control Slot driver so slot voltage rails can be
turned on/off if described in Root Port devicetree node (Qiang Yu)

- Parse only PCI bridge child nodes in devicetree, skipping unrelated
nodes such as OPP (Operating Performance Points), which caused
probe failures (Krishna Chaitanya Chundru)

- Add 8.0 GT/s and 32.0 GT/s equalization settings (Ziyue Zhang)

- Consolidate Root Port 'phy' and 'reset' properties in struct
qcom_pcie_port, regardless of whether we got them from the Root
Port node or the host bridge node (Manivannan Sadhasivam)

- Fetch and map the ELBI register space in the DWC core rather than
in each driver individually (Krishna Chaitanya Chundru)

- Enable ECAM mechanism in DWC core by setting up iATU with 'CFG
Shift Feature' and use this in the qcom driver (Krishna Chaitanya
Chundru)

- Add SM8750 compatible to qcom,pcie-sm8550.yaml (Krishna Chaitanya
Chundru)

- Update qcom,pcie-x1e80100.yaml to allow fifth PCIe host on Qualcomm
Glymur, which is compatible with X1E80100 but doesn't have the
cnoc_sf_axi clock (Qiang Yu)

Renesas R-Car PCIe controller driver:

- Fix a typo that prevented correct PHY initialization (Marek Vasut)

- Add a missing 1ms delay after PWR reset assertion as required by
the V4H manual (Marek Vasut)

- Assure reset has completed before DBI access to avoid SError (Marek
Vasut)

- Fix inverted PHY initialization check, which sometimes led to
timeouts and failure to start the controller (Marek Vasut)

- Pass the correct IRQ domain to generic_handle_domain_irq() to fix a
regression when converting to msi_create_parent_irq_domain()
(Claudiu Beznea)

- Drop the spinlock protecting the PMSR register - it's no longer
required since pci_lock already serializes accesses (Marek Vasut)

- Convert struct rcar_msi mask_lock to raw spinlock to avoid a lock
nesting error (Marek Vasut)

SOPHGO PCIe controller driver:

- Check for existence of struct cdns_pcie.ops before using it to
allow Cadence drivers that don't need to supply ops (Chen Wang)

- Add DT binding and driver for the SOPHGO SG2042 PCIe controller
(Chen Wang)

STMicroelectronics STM32MP25 PCIe controller driver:

- Update pinctrl documentation of initial states and use in runtime
suspend/resume (Christian Bruel)

- Add pinctrl_pm_select_init_state() for use by stm32 driver, which
needs it during resume (Christian Bruel)

- Add devicetree bindings and drivers for the STMicroelectronics
STM32MP25 in host and endpoint modes (Christian Bruel)

Synopsys DesignWare PCIe controller driver:

- Add support for x16 in devicetree 'num-lanes' property (Konrad
Dybcio)

- Verify that if DT specifies a single IRQ for all eDMA channels, it
is named 'dma' (Niklas Cassel)

TI J721E PCIe driver:

- Add MODULE_DEVICE_TABLE() so driver can be autoloaded (Siddharth
Vadapalli)

- Power controller off before configuring the glue layer so the
controller latches the correct values on power-on (Siddharth
Vadapalli)

TI Keystone PCIe controller driver:

- Use devm_request_irq() so 'ks-pcie-error-irq' is freed when driver
exits with error (Siddharth Vadapalli)

- Add Peripheral Virtualization Unit (PVU), which restricts DMA from
PCIe devices to specific regions of host memory, to the ti,am65
binding (Jan Kiszka)

Xilinx NWL PCIe controller driver:

- Clear bootloader E_ECAM_CONTROL before merging in the new driver
value to avoid writing invalid values (Jani Nurminen)"

* tag 'pci-v6.18-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci: (141 commits)
PCI/AER: Avoid NULL pointer dereference in aer_ratelimit()
MAINTAINERS: Add entry for ST STM32MP25 PCIe drivers
PCI: stm32-ep: Add PCIe Endpoint support for STM32MP25
dt-bindings: PCI: Add STM32MP25 PCIe Endpoint bindings
PCI: stm32: Add PCIe host support for STM32MP25
PCI: xilinx-nwl: Fix ECAM programming
PCI: j721e: Fix incorrect error message in probe()
PCI: keystone: Use devm_request_irq() to free "ks-pcie-error-irq" on exit
dt-bindings: PCI: qcom,pcie-x1e80100: Set clocks minItems for the fifth Glymur PCIe Controller
PCI: dwc: Support 16-lane operation
PCI: Add lockdep assertion in pci_stop_and_remove_bus_device()
PCI/IOV: Add PCI rescan-remove locking when enabling/disabling SR-IOV
PCI: rcar-host: Convert struct rcar_msi mask_lock into raw spinlock
PCI: tegra194: Rename 'root_bus' to 'root_port_bus' in tegra_pcie_downstream_dev_to_D0()
PCI: tegra: Convert struct tegra_msi mask_lock into raw spinlock
PCI: rcar-gen4: Fix inverted break condition in PHY initialization
PCI: rcar-gen4: Assure reset occurs before DBI access
PCI: rcar-gen4: Add missing 1ms delay after PWR reset assertion
PCI: Set up bridge resources earlier
PCI: rcar-host: Drop PMSR spinlock
...

Documentation/ABI/testing/sysfs-bus-pci

···
 
 		  # ls doe_features
 		  0001:01        0001:02        doe_discovery
+
+What:		/sys/bus/pci/devices/.../serial_number
+Date:		December 2025
+Contact:	Matthew Wood <[e-mail]>
+Description:
+		This is visible only for PCI devices that support the serial
+		number extended capability. The file is read only and due to
+		the possible sensitivity of accessible serial numbers, admin
+		only.

Documentation/PCI/endpoint/pci-vntb-howto.rst

···
 attributes that can be configured by the user::
 
 	# ls functions/pci_epf_vntb/func1/pci_epf_vntb.0/
-	db_count    mw1         mw2         mw3         mw4         num_mws
-	spad_count
+	ctrl_bar  db_count  mw1_bar  mw2_bar  mw3_bar  mw4_bar	spad_count
+	db_bar	  mw1	    mw2      mw3      mw4      num_mws	vbus_number
+	vntb_vid  vntb_pid
 
 A sample configuration for NTB function is given below::
 
···
 	# echo 128 > functions/pci_epf_vntb/func1/pci_epf_vntb.0/spad_count
 	# echo 1 > functions/pci_epf_vntb/func1/pci_epf_vntb.0/num_mws
 	# echo 0x100000 > functions/pci_epf_vntb/func1/pci_epf_vntb.0/mw1
+
+By default, each construct is assigned a BAR, as needed and in order.
+Should a specific BAR setup be required by the platform, BAR may be assigned
+to each construct using the related ``XYZ_bar`` entry.
 
 A sample configuration for virtual NTB driver for virtual PCI bus::
 

Documentation/PCI/pci-error-recovery.rst

···
 Many PCI bus controllers are able to detect a variety of hardware
 PCI errors on the bus, such as parity errors on the data and address
 buses, as well as SERR and PERR errors.  Some of the more advanced
-chipsets are able to deal with these errors; these include PCI-E chipsets,
+chipsets are able to deal with these errors; these include PCIe chipsets,
 and the PCI-host bridges found on IBM Power4, Power5 and Power6-based
 pSeries boxes. A typical action taken is to disconnect the affected device,
 halting all I/O to it.  The goal of a disconnection is to avoid system
···
 if it implements any, it must implement error_detected(). If a callback
 is not implemented, the corresponding feature is considered unsupported.
 For example, if mmio_enabled() and resume() aren't there, then it
-is assumed that the driver is not doing any direct recovery and requires
-a slot reset.  Typically a driver will want to know about
+is assumed that the driver does not need these callbacks
+for recovery.  Typically a driver will want to know about
 a slot_reset().
 
 The actual steps taken by a platform to recover from a PCI error
···
 is isolated, in that all I/O is blocked: all reads return 0xffffffff,
 all writes are ignored.
 
+Similarly, on platforms supporting Downstream Port Containment
+(PCIe r7.0 sec 6.2.11), the link to the sub-hierarchy with the
+faulting device is disabled. Any device in the sub-hierarchy
+becomes inaccessible.
 
 STEP 1: Notification
 --------------------
···
 All drivers participating in this system must implement this call.
 The driver must return one of the following result codes:
 
+  - PCI_ERS_RESULT_RECOVERED
+      Driver returns this if it thinks the device is usable despite
+      the error and does not need further intervention.
   - PCI_ERS_RESULT_CAN_RECOVER
       Driver returns this if it thinks it might be able to recover
       the HW by just banging IOs or if it wants to be given
···
 all drivers on a segment agree that they can try to recover and if no automatic
 link reset was performed by the HW. If the platform can't just re-enable IOs
 without a slot reset or a link reset, it will not call this callback, and
-instead will have gone directly to STEP 3 (Link Reset) or STEP 4 (Slot Reset)
+instead will have gone directly to STEP 3 (Link Reset) or STEP 4 (Slot Reset).
+
+.. note::
+
+   On platforms supporting Advanced Error Reporting (PCIe r7.0 sec 6.2),
+   the faulting device may already be accessible in STEP 1 (Notification).
+   Drivers should nevertheless defer accesses to STEP 2 (MMIO Enabled)
+   to be compatible with EEH on powerpc and with s390 (where devices are
+   inaccessible until STEP 2).
+
+   On platforms supporting Downstream Port Containment, the link to the
+   sub-hierarchy with the faulting device is re-enabled in STEP 3 (Link
+   Reset). Hence devices in the sub-hierarchy are inaccessible until
+   STEP 4 (Slot Reset).
+
+   For errors such as Surprise Down (PCIe r7.0 sec 6.2.7), the device
+   may not even be accessible in STEP 4 (Slot Reset). Drivers can detect
+   accessibility by checking whether reads from the device return all 1's
+   (PCI_POSSIBLE_ERROR()).
 
 .. note::
 
···
 
 The next step taken depends on the results returned by the drivers.
 If all drivers returned PCI_ERS_RESULT_RECOVERED, then the platform
-proceeds to either STEP3 (Link Reset) or to STEP 5 (Resume Operations).
+proceeds to either STEP 3 (Link Reset) or to STEP 5 (Resume Operations).
 
 If any driver returned PCI_ERS_RESULT_NEED_RESET, then the platform
 proceeds to STEP 4 (Slot Reset)
 
 STEP 3: Link Reset
 ------------------
-The platform resets the link.  This is a PCI-Express specific step
+The platform resets the link.  This is a PCIe specific step
 and is done whenever a fatal error has been detected that can be
 "solved" by resetting the link.
 
···
 power-on followed by power-on BIOS/system firmware initialization.
 Soft reset is also known as hot-reset.
 
-Powerpc fundamental reset is supported by PCI Express cards only
+Powerpc fundamental reset is supported by PCIe cards only
 and results in device's state machines, hardware logic, port states and
 configuration registers to initialize to their default conditions.
 
 For most PCI devices, a soft reset will be sufficient for recovery.
 Optional fundamental reset is provided to support a limited number
-of PCI Express devices for which a soft reset is not sufficient
+of PCIe devices for which a soft reset is not sufficient
 for recovery.
 
 If the platform supports PCI hotplug, then the reset might be
···
 	- PCI_ERS_RESULT_DISCONNECT
 	  Same as above.
 
-Drivers for PCI Express cards that require a fundamental reset must
+Drivers for PCIe cards that require a fundamental reset must
 set the needs_freset bit in the pci_dev structure in their probe function.
 For example, the QLogic qla2xxx driver sets the needs_freset bit for certain
 PCI card types::

Documentation/PCI/pcieaer-howto.rst

···
 ----------------
 
 When a PCIe AER error is captured, an error message will be output to
-console. If it's a correctable error, it is output as an info message.
+console. If it's a correctable error, it is output as a warning message.
 Otherwise, it is printed as an error. So users could choose different
 log level to filter out correctable error messages.
 
 Below shows an example::
 
-  0000:50:00.0: PCIe Bus Error: severity=Uncorrected (Fatal), type=Transaction Layer, id=0500(Requester ID)
+  0000:50:00.0: PCIe Bus Error: severity=Uncorrectable (Fatal), type=Transaction Layer, (Requester ID)
   0000:50:00.0:   device [8086:0329] error status/mask=00100000/00000000
-  0000:50:00.0:    [20] Unsupported Request    (First)
-  0000:50:00.0:   TLP Header: 04000001 00200a03 05010000 00050100
+  0000:50:00.0:    [20] UnsupReq               (First)
+  0000:50:00.0:   TLP Header: 0x04000001 0x00200a03 0x05010000 0x00050100
 
 In the example, 'Requester ID' means the ID of the device that sent
 the error message to the Root Port. Please refer to PCIe specs for other
···
 an error. The Root Port, upon receiving an error reporting message,
 internally processes and logs the error message in its AER
 Capability structure. Error information being logged includes storing
-the error reporting agent's requestor ID into the Error Source
+the error reporting agent's Requester ID into the Error Source
 Identification Registers and setting the error bits of the Root Error
 Status Register accordingly. If AER error reporting is enabled in the Root
 Error Command Register, the Root Port generates an interrupt when an
···
 Provide callbacks
 -----------------
 
-callback reset_link to reset PCIe link
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-This callback is used to reset the PCIe physical link when a
-fatal error happens. The Root Port AER service driver provides a
-default reset_link function, but different Upstream Ports might
-have different specifications to reset the PCIe link, so
-Upstream Port drivers may provide their own reset_link functions.
-
-Section 3.2.2.2 provides more detailed info on when to call
-reset_link.
-
 PCI error-recovery callbacks
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
···
 Data struct pci_driver has a pointer, err_handler, to point to
 pci_error_handlers who consists of a couple of callback function
 pointers. The AER driver follows the rules defined in
-pci-error-recovery.rst except PCIe-specific parts (e.g.
-reset_link). Please refer to pci-error-recovery.rst for detailed
+pci-error-recovery.rst except PCIe-specific parts (see
+below). Please refer to pci-error-recovery.rst for detailed
 definitions of the callbacks.
 
 The sections below specify when to call the error callback functions.
···
 require any recovery actions. The AER driver clears the device's
 correctable error status register accordingly and logs these errors.
 
-Non-correctable (non-fatal and fatal) errors
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Uncorrectable (non-fatal and fatal) errors
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-If an error message indicates a non-fatal error, performing link reset
+The AER driver performs a Secondary Bus Reset to recover from
+uncorrectable errors. The reset is applied at the port above
+the originating device: If the originating device is an Endpoint,
+only the Endpoint is reset. If on the other hand the originating
+device has subordinate devices, those are all affected by the
+reset as well.
+
+If the originating device is a Root Complex Integrated Endpoint,
+there's no port above where a Secondary Bus Reset could be applied.
+In this case, the AER driver instead applies a Function Level Reset.
+
+If an error message indicates a non-fatal error, performing a reset
 at upstream is not required. The AER driver calls error_detected(dev,
 pci_channel_io_normal) to all drivers associated within a hierarchy in
 question. For example::
···
 
 A driver may return PCI_ERS_RESULT_CAN_RECOVER,
 PCI_ERS_RESULT_DISCONNECT, or PCI_ERS_RESULT_NEED_RESET, depending on
-whether it can recover or the AER driver calls mmio_enabled as next.
+whether it can recover without a reset, considers the device unrecoverable
+or needs a reset for recovery. If all affected drivers agree that they can
+recover without a reset, it is skipped. Should one driver request a reset,
+it overrides all other drivers.
 
 If an error message indicates a fatal error, kernel will broadcast
 error_detected(dev, pci_channel_io_frozen) to all drivers within
-a hierarchy in question. Then, performing link reset at upstream is
-necessary. As different kinds of devices might use different approaches
-to reset link, AER port service driver is required to provide the
-function to reset link via callback parameter of pcie_do_recovery()
-function. If reset_link is not NULL, recovery function will use it
-to reset the link. If error_detected returns PCI_ERS_RESULT_CAN_RECOVER
-and reset_link returns PCI_ERS_RESULT_RECOVERED, the error handling goes
-to mmio_enabled.
+a hierarchy in question. Then, performing a reset at upstream is
+necessary. If error_detected returns PCI_ERS_RESULT_CAN_RECOVER
+to indicate that recovery without a reset is possible, the error
+handling goes to mmio_enabled, but afterwards a reset is still
+performed.
 
-Frequent Asked Questions
-------------------------
+In other words, for non-fatal errors, drivers may opt in to a reset.
+But for fatal errors, they cannot opt out of a reset, based on the
+assumption that the link is unreliable.
+
+Frequently Asked Questions
+--------------------------
 
 Q:
   What happens if a PCIe device driver does not provide an
   error recovery handler (pci_driver->err_handler is equal to NULL)?
 
 A:
-  The devices attached with the driver won't be recovered. If the
-  error is fatal, kernel will print out warning messages. Please refer
-  to section 3 for more information.
-
-Q:
-  What happens if an upstream port service driver does not provide
-  callback reset_link?
-
-A:
-  Fatal error recovery will fail if the errors are reported by the
-  upstream ports who are attached by the service driver.
+  The devices attached with the driver won't be recovered.
+  The kernel will print out informational messages to identify
+  unrecoverable devices.
 
 
 Software error injection

Documentation/devicetree/bindings/pci/amd,versal2-mdb-host.yaml

···
       - "#address-cells"
       - "#interrupt-cells"
 
+patternProperties:
+  '^pcie@[0-2],0$':
+    type: object
+    $ref: /schemas/pci/pci-pci-bridge.yaml#
+
+    properties:
+      reg:
+        maxItems: 1
+
+    unevaluatedProperties: false
+
 required:
   - reg
   - reg-names
···
   - |
     #include <dt-bindings/interrupt-controller/arm-gic.h>
     #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/gpio/gpio.h>
 
     soc {
         #address-cells = <2>;
···
             #size-cells = <2>;
             #interrupt-cells = <1>;
             device_type = "pci";
+
+            pcie@0,0 {
+                device_type = "pci";
+                reg = <0x0 0x0 0x0 0x0 0x0>;
+                reset-gpios = <&tca6416_u37 7 GPIO_ACTIVE_LOW>;
+                #address-cells = <3>;
+                #size-cells = <2>;
+                ranges;
+            };
+
             pcie_intc_0: interrupt-controller {
                 #address-cells = <0>;
                 #interrupt-cells = <1>;
                 interrupt-controller;
-           };
+            };
         };
     };

Documentation/devicetree/bindings/pci/mediatek-pcie-gen3.yaml

···
               - mediatek,mt8188-pcie
               - mediatek,mt8195-pcie
           - const: mediatek,mt8192-pcie
+      - items:
+          - enum:
+              - mediatek,mt6991-pcie
+          - const: mediatek,mt8196-pcie
       - const: mediatek,mt8192-pcie
+      - const: mediatek,mt8196-pcie
       - const: airoha,en7581-pcie
 
   reg:
···
         reset-names:
           minItems: 1
           maxItems: 2
+
+        mediatek,pbus-csr: false
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - mediatek,mt8196-pcie
+    then:
+      properties:
+        clocks:
+          minItems: 6
+
+        clock-names:
+          items:
+            - const: pl_250m
+            - const: tl_26m
+            - const: bus
+            - const: low_power
+            - const: peri_26m
+            - const: peri_mem
+
+        resets:
+          minItems: 2
+
+        reset-names:
+          items:
+            - const: phy
+            - const: mac
 
         mediatek,pbus-csr: false
 

Documentation/devicetree/bindings/pci/qcom,pcie-sa8255p.yaml

···
         #size-cells = <2>;
 
         pci@1c00000 {
-           compatible = "qcom,pcie-sa8255p";
-           reg = <0x4 0x00000000 0 0x10000000>;
-           device_type = "pci";
-           #address-cells = <3>;
-           #size-cells = <2>;
-           ranges = <0x02000000 0x0 0x40100000 0x0 0x40100000 0x0 0x1ff00000>,
-                    <0x43000000 0x4 0x10100000 0x4 0x10100000 0x0 0x40000000>;
-           bus-range = <0x00 0xff>;
-           dma-coherent;
-           linux,pci-domain = <0>;
-           power-domains = <&scmi5_pd 0>;
-           iommu-map = <0x0 &pcie_smmu 0x0000 0x1>,
-                       <0x100 &pcie_smmu 0x0001 0x1>;
-           interrupt-parent = <&intc>;
-           interrupts = <GIC_SPI 307 IRQ_TYPE_LEVEL_HIGH>,
-                        <GIC_SPI 308 IRQ_TYPE_LEVEL_HIGH>,
-                        <GIC_SPI 309 IRQ_TYPE_LEVEL_HIGH>,
-                        <GIC_SPI 312 IRQ_TYPE_LEVEL_HIGH>,
-                        <GIC_SPI 313 IRQ_TYPE_LEVEL_HIGH>,
-                        <GIC_SPI 314 IRQ_TYPE_LEVEL_HIGH>,
-                        <GIC_SPI 374 IRQ_TYPE_LEVEL_HIGH>,
-                        <GIC_SPI 375 IRQ_TYPE_LEVEL_HIGH>;
-           interrupt-names = "msi0", "msi1", "msi2", "msi3",
-                                  "msi4", "msi5", "msi6", "msi7";
+            compatible = "qcom,pcie-sa8255p";
+            reg = <0x4 0x00000000 0 0x10000000>;
+            device_type = "pci";
+            #address-cells = <3>;
+            #size-cells = <2>;
+            ranges = <0x02000000 0x0 0x40100000 0x0 0x40100000 0x0 0x1ff00000>,
+                     <0x43000000 0x4 0x10100000 0x4 0x10100000 0x0 0x40000000>;
+            bus-range = <0x00 0xff>;
+            dma-coherent;
+            linux,pci-domain = <0>;
+            power-domains = <&scmi5_pd 0>;
+            iommu-map = <0x0 &pcie_smmu 0x0000 0x1>,
+                        <0x100 &pcie_smmu 0x0001 0x1>;
+            interrupt-parent = <&intc>;
+            interrupts = <GIC_SPI 307 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 308 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 309 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 312 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 313 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 314 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 374 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 375 IRQ_TYPE_LEVEL_HIGH>;
+            interrupt-names = "msi0", "msi1", "msi2", "msi3",
+                                   "msi4", "msi5", "msi6", "msi7";
 
-           #interrupt-cells = <1>;
-           interrupt-map-mask = <0 0 0 0x7>;
-           interrupt-map = <0 0 0 1 &intc GIC_SPI 148 IRQ_TYPE_LEVEL_HIGH>,
-                           <0 0 0 2 &intc GIC_SPI 149 IRQ_TYPE_LEVEL_HIGH>,
-                           <0 0 0 3 &intc GIC_SPI 150 IRQ_TYPE_LEVEL_HIGH>,
-                           <0 0 0 4 &intc GIC_SPI 151 IRQ_TYPE_LEVEL_HIGH>;
+            #interrupt-cells = <1>;
+            interrupt-map-mask = <0 0 0 0x7>;
+            interrupt-map = <0 0 0 1 &intc GIC_SPI 148 IRQ_TYPE_LEVEL_HIGH>,
+                            <0 0 0 2 &intc GIC_SPI 149 IRQ_TYPE_LEVEL_HIGH>,
+                            <0 0 0 3 &intc GIC_SPI 150 IRQ_TYPE_LEVEL_HIGH>,
+                            <0 0 0 4 &intc GIC_SPI 151 IRQ_TYPE_LEVEL_HIGH>;
 
-           pcie@0 {
-                   device_type = "pci";
-                   reg = <0x0 0x0 0x0 0x0 0x0>;
-                   bus-range = <0x01 0xff>;
+            pcie@0 {
+                device_type = "pci";
+                reg = <0x0 0x0 0x0 0x0 0x0>;
+                bus-range = <0x01 0xff>;
 
-                   #address-cells = <3>;
-                   #size-cells = <2>;
-                   ranges;
+                #address-cells = <3>;
+                #size-cells = <2>;
+                ranges;
             };
         };
     };

Documentation/devicetree/bindings/pci/qcom,pcie-sm8550.yaml

···
           - enum:
               - qcom,sar2130p-pcie
               - qcom,pcie-sm8650
+              - qcom,pcie-sm8750
           - const: qcom,pcie-sm8550
 
   reg:

Documentation/devicetree/bindings/pci/qcom,pcie-x1e80100.yaml

···
       - const: mhi # MHI registers
 
   clocks:
-    minItems: 7
+    minItems: 6
     maxItems: 7
 
   clock-names:
+    minItems: 6
     items:
       - const: aux # Auxiliary clock
       - const: cfg # Configuration clock

Documentation/devicetree/bindings/pci/sophgo,sg2042-pcie-host.yaml

···
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pci/sophgo,sg2042-pcie-host.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Sophgo SG2042 PCIe Host (Cadence PCIe Wrapper)
+
+description:
+  Sophgo SG2042 PCIe host controller is based on the Cadence PCIe core.
+
+maintainers:
+  - Chen Wang <[e-mail]>
+
+properties:
+  compatible:
+    const: sophgo,sg2042-pcie-host
+
+  reg:
+    maxItems: 2
+
+  reg-names:
+    items:
+      - const: reg
+      - const: cfg
+
+  vendor-id:
+    const: 0x1f1c
+
+  device-id:
+    const: 0x2042
+
+  msi-parent: true
+
+allOf:
+  - $ref: cdns-pcie-host.yaml#
+
+required:
+  - compatible
+  - reg
+  - reg-names
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    pcie@62000000 {
+      compatible = "sophgo,sg2042-pcie-host";
+      device_type = "pci";
+      reg = <0x62000000  0x00800000>,
+            <0x48000000  0x00001000>;
+      reg-names = "reg", "cfg";
+      #address-cells = <3>;
+      #size-cells = <2>;
+      ranges = <0x81000000 0 0x00000000 0xde000000 0 0x00010000>,
+               <0x82000000 0 0xd0400000 0xd0400000 0 0x0d000000>;
+      bus-range = <0x00 0xff>;
+      vendor-id = <0x1f1c>;
+      device-id = <0x2042>;
+      cdns,no-bar-match-nbits = <48>;
+      msi-parent = <&msi>;
+    };

Documentation/devicetree/bindings/pci/st,stm32-pcie-common.yaml

···
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pci/st,stm32-pcie-common.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: STM32MP25 PCIe RC/EP controller
+
+maintainers:
+  - Christian Bruel <[e-mail]>
+
+description:
+  STM32MP25 PCIe RC/EP common properties
+
+properties:
+  clocks:
+    maxItems: 1
+    description: PCIe system clock
+
+  resets:
+    maxItems: 1
+
+  power-domains:
+    maxItems: 1
+
+  access-controllers:
+    maxItems: 1
+
+required:
+  - clocks
+  - resets
+
+additionalProperties: true

Documentation/devicetree/bindings/pci/st,stm32-pcie-ep.yaml

···
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pci/st,stm32-pcie-ep.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: STMicroelectronics STM32MP25 PCIe Endpoint
+
+maintainers:
+  - Christian Bruel <[e-mail]>
+
+description:
+  PCIe endpoint controller based on the Synopsys DesignWare PCIe core.
+
+allOf:
+  - $ref: /schemas/pci/snps,dw-pcie-ep.yaml#
+  - $ref: /schemas/pci/st,stm32-pcie-common.yaml#
+
+properties:
+  compatible:
+    const: st,stm32mp25-pcie-ep
+
+  reg:
+    items:
+      - description: Data Bus Interface (DBI) registers.
+      - description: Data Bus Interface (DBI) shadow registers.
+      - description: Internal Address Translation Unit (iATU) registers.
+      - description: PCIe configuration registers.
+
+  reg-names:
+    items:
+      - const: dbi
+      - const: dbi2
+      - const: atu
+      - const: addr_space
+
+  reset-gpios:
+    description: GPIO controlled connection to PERST# signal
+    maxItems: 1
+
+  phys:
+    maxItems: 1
+
+required:
+  - phys
+  - reset-gpios
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/st,stm32mp25-rcc.h>
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/phy/phy.h>
+    #include <dt-bindings/reset/st,stm32mp25-rcc.h>
+
+    pcie-ep@48400000 {
+        compatible = "st,stm32mp25-pcie-ep";
+        reg = <0x48400000 0x400000>,
+              <0x48500000 0x100000>,
+              <0x48700000 0x80000>,
+              <0x10000000 0x10000000>;
+        reg-names = "dbi", "dbi2", "atu", "addr_space";
+        clocks = <&rcc CK_BUS_PCIE>;
+        phys = <&combophy PHY_TYPE_PCIE>;
+        resets = <&rcc PCIE_R>;
+        pinctrl-names = "default", "init";
+        pinctrl-0 = <&pcie_pins_a>;
+        pinctrl-1 = <&pcie_init_pins_a>;
+        reset-gpios = <&gpioj 8 GPIO_ACTIVE_LOW>;
+        access-controllers = <&rifsc 68>;
+        power-domains = <&CLUSTER_PD>;
+    };

Documentation/devicetree/bindings/pci/st,stm32-pcie-host.yaml

···
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pci/st,stm32-pcie-host.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: STMicroelectronics STM32MP25 PCIe Root Complex
+
+maintainers:
+  - Christian Bruel <[e-mail]>
+
+description:
+  PCIe root complex controller based on the Synopsys DesignWare PCIe core.
+
+allOf:
+  - $ref: /schemas/pci/snps,dw-pcie.yaml#
+  - $ref: /schemas/pci/st,stm32-pcie-common.yaml#
+
+properties:
+  compatible:
+    const: st,stm32mp25-pcie-rc
+
+  reg:
+    items:
+      - description: Data Bus Interface (DBI) registers.
+      - description: PCIe configuration registers.
+
+  reg-names:
+    items:
+      - const: dbi
+      - const: config
+
+  msi-parent:
+    maxItems: 1
+
+patternProperties:
+  '^pcie@[0-2],0$':
+    type: object
+    $ref: /schemas/pci/pci-pci-bridge.yaml#
+
+    properties:
+      reg:
+        maxItems: 1
+
+      phys:
+        maxItems: 1
+
+      reset-gpios:
+        description: GPIO controlled connection to PERST# signal
+        maxItems: 1
+
+      wake-gpios:
+        description: GPIO used as WAKE# input signal
+        maxItems: 1
+
+    required:
+      - phys
+      - ranges
+
+    unevaluatedProperties: false
+
+required:
+  - interrupt-map
+  - interrupt-map-mask
+  - ranges
+  - dma-ranges
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/st,stm32mp25-rcc.h>
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/phy/phy.h>
+    #include <dt-bindings/reset/st,stm32mp25-rcc.h>
+
+    pcie@48400000 {
+        compatible = "st,stm32mp25-pcie-rc";
+        device_type = "pci";
+        reg = <0x48400000 0x400000>,
+              <0x10000000 0x10000>;
+        reg-names = "dbi", "config";
+        #interrupt-cells = <1>;
+        interrupt-map-mask = <0 0 0 7>;
+        interrupt-map = <0 0 0 1 &intc 0 0 GIC_SPI 264 IRQ_TYPE_LEVEL_HIGH>,
+                        <0 0 0 2 &intc 0 0 GIC_SPI 265 IRQ_TYPE_LEVEL_HIGH>,
+                        <0 0 0 3 &intc 0 0 GIC_SPI 266 IRQ_TYPE_LEVEL_HIGH>,
+                        <0 0 0 4 &intc 0 0 GIC_SPI 267 IRQ_TYPE_LEVEL_HIGH>;
+        #address-cells = <3>;
+        #size-cells = <2>;
+        ranges = <0x01000000 0x0 0x00000000 0x10010000 0x0 0x10000>,
+                 <0x02000000 0x0 0x10020000 0x10020000 0x0 0x7fe0000>,
+                 <0x42000000 0x0 0x18000000 0x18000000 0x0 0x8000000>;
+        dma-ranges = <0x42000000 0x0 0x80000000 0x80000000 0x0 0x80000000>;
+        clocks = <&rcc CK_BUS_PCIE>;
+        resets = <&rcc PCIE_R>;
+        msi-parent = <&v2m0>;
+        access-controllers = <&rifsc 68>;
+        power-domains = <&CLUSTER_PD>;
+
+        pcie@0,0 {
+            device_type = "pci";
+            reg = <0x0 0x0 0x0 0x0 0x0>;
+            phys = <&combophy PHY_TYPE_PCIE>;
+            wake-gpios = <&gpioh 5 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
+            reset-gpios = <&gpioj 8 GPIO_ACTIVE_LOW>;
+            #address-cells = <3>;
+            #size-cells = <2>;
+            ranges;
+        };
+    };

Documentation/devicetree/bindings/pci/ti,am65-pci-host.yaml

···
       - ti,keystone-pcie
 
   reg:
-    maxItems: 4
+    minItems: 4
+    maxItems: 6
 
   reg-names:
+    minItems: 4
     items:
       - const: app
       - const: dbics
       - const: config
       - const: atu
+      - const: vmap_lp
+      - const: vmap_hp
 
   interrupts:
     maxItems: 1
···
     items:
       pattern: '^pcie-phy[0-1]$'
 
+  memory-region:
+    maxItems: 1
+    description: |
+      phandle to a restricted DMA pool to be used for all devices behind
+      this controller. The regions should be defined according to
+      reserved-memory/shared-dma-pool.yaml.
+      Note that enforcement via the PVU will only be available to
+      ti,am654-pcie-rc devices.
+
 required:
   - compatible
   - reg
···
     - power-domains
     - msi-map
     - num-viewport
+else:
+  properties:
+    reg:
+      maxItems: 4
+
+    reg-names:
+      maxItems: 4
 
 unevaluatedProperties: false
 
···
         reg =  <0x5500000 0x1000>,
                <0x5501000 0x1000>,
                <0x10000000 0x2000>,
-               <0x5506000 0x1000>;
-        reg-names = "app", "dbics", "config", "atu";
+               <0x5506000 0x1000>,
+               <0x2900000 0x1000>,
+               <0x2908000 0x1000>;
+        reg-names = "app", "dbics", "config", "atu", "vmap_lp", "vmap_hp";
         power-domains = <&k3_pds 120 TI_SCI_PD_EXCLUSIVE>;
         #address-cells = <3>;
         #size-cells = <2>;

Documentation/driver-api/pin-control.rst

···
 Pin control requests from drivers
 =================================
 
-When a device driver is about to probe the device core will automatically
-attempt to issue ``pinctrl_get_select_default()`` on these devices.
+When a device driver is about to probe, the device core attaches the
+standard states if they are defined in the device tree by calling
+``pinctrl_bind_pins()`` on these devices.
+Possible standard state names are: "default", "init", "sleep" and "idle".
+
+- if ``default`` is defined in the device tree, it is selected before
+  device probe.
+
+- if ``init`` and ``default`` are defined in the device tree, the "init"
+  state is selected before the driver probe and the "default" state is
+  selected after the driver probe.
+
+- the ``sleep`` and ``idle`` states are for power management and can only
+  be selected with the PM API bellow.
+
+PM interfaces
+=================
+PM runtime suspend/resume might need to execute the same init sequence as
+during probe. Since the predefined states are already attached to the
+device, the driver can activate these states explicitly with the
+following helper functions:
+
+- ``pinctrl_pm_select_default_state()``
+- ``pinctrl_pm_select_init_state()``
+- ``pinctrl_pm_select_sleep_state()``
+- ``pinctrl_pm_select_idle_state()``
+
+For example, if resuming the device depend on certain pinmux states
+
+.. code-block:: c
+
+	foo_suspend()
+	{
+		/* suspend device */
+		...
+
+		pinctrl_pm_select_sleep_state(dev);
+	}
+
+	foo_resume()
+	{
+		pinctrl_pm_select_init_state(dev);
+
+		/* resuming device */
+		...
+
+		pinctrl_pm_select_default_state(dev);
+	}
+
 This way driver writers do not need to add any of the boilerplate code
 of the type found below. However when doing fine-grained state selection
 and not using the "default" state, you may have to do some device driver
···
 operation and going to sleep, moving from the ``PINCTRL_STATE_DEFAULT`` to
 ``PINCTRL_STATE_SLEEP`` at runtime, re-biasing or even re-muxing pins to save
 current in sleep mode.
+
+Another case is when the pinctrl needs to switch to a certain mode during
+probe and then revert to the default state at the end of probe. For example
+a PINMUX may need to be configured as a GPIO during probe. In this case, use
+``PINCTRL_STATE_INIT`` to switch state before probe, then move to
+``PINCTRL_STATE_DEFAULT`` at the end of probe for normal operation.
 
 A driver may request a certain control state to be activated, usually just the
 default state like this:

MAINTAINERS

···
 S:	Maintained
 F:	drivers/pci/controller/dwc/pci-exynos.c
 
+PCI DRIVER FOR STM32MP25
+M:	Christian Bruel <[e-mail]>
+L:	[e-mail]
+S:	Maintained
+F:	Documentation/devicetree/bindings/pci/st,stm32-pcie-*.yaml
+F:	drivers/pci/controller/dwc/*stm32*
+
 PCI DRIVER FOR SYNOPSYS DESIGNWARE
 M:	Jingoo Han <[e-mail]>
 M:	Manivannan Sadhasivam <[e-mail]>

arch/m68k/kernel/pcibios.c

···
  */
 int pcibios_enable_device(struct pci_dev *dev, int mask)
 {
-	struct resource *r;
 	u16 cmd, newcmd;
-	int idx;
+	int ret;
 
-	pci_read_config_word(dev, PCI_COMMAND, &cmd);
-	newcmd = cmd;
-
-	for (idx = 0; idx < 6; idx++) {
-		/* Only set up the requested stuff */
-		if (!(mask & (1 << idx)))
-			continue;
-
-		r = dev->resource + idx;
-		if (!r->start && r->end) {
-			pr_err("PCI: Device %s not available because of resource collisions\n",
-				pci_name(dev));
-			return -EINVAL;
-		}
-		if (r->flags & IORESOURCE_IO)
-			newcmd |= PCI_COMMAND_IO;
-		if (r->flags & IORESOURCE_MEM)
-			newcmd |= PCI_COMMAND_MEMORY;
-	}
+	ret = pci_enable_resources(dev, mask);
+	if (ret < 0)
+		return ret;
 
 	/*
 	 * Bridges (eg, cardbus bridges) need to be fully enabled
 	 */
-	if ((dev->class >> 16) == PCI_BASE_CLASS_BRIDGE)
+	if ((dev->class >> 16) == PCI_BASE_CLASS_BRIDGE) {
+		pci_read_config_word(dev, PCI_COMMAND, &cmd);
 		newcmd |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY;
-
-
-	if (newcmd != cmd) {
-		pr_info("PCI: enabling device %s (0x%04x -> 0x%04x)\n",
-			pci_name(dev), cmd, newcmd);
-		pci_write_config_word(dev, PCI_COMMAND, newcmd);
+		if (newcmd != cmd) {
+			pr_info("PCI: enabling bridge %s (0x%04x -> 0x%04x)\n",
+				pci_name(dev), cmd, newcmd);
+			pci_write_config_word(dev, PCI_COMMAND, newcmd);
+		}
 	}
 	return 0;
 }

arch/mips/pci/pci-legacy.c

···
 
 subsys_initcall(pcibios_init);
 
-static int pcibios_enable_resources(struct pci_dev *dev, int mask)
-{
-	u16 cmd, old_cmd;
-	int idx;
-	struct resource *r;
-
-	pci_read_config_word(dev, PCI_COMMAND, &cmd);
-	old_cmd = cmd;
-	pci_dev_for_each_resource(dev, r, idx) {
-		/* Only set up the requested stuff */
-		if (!(mask & (1<<idx)))
-			continue;
-
-		if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
-			continue;
-		if ((idx == PCI_ROM_RESOURCE) &&
-				(!(r->flags & IORESOURCE_ROM_ENABLE)))
-			continue;
-		if (!r->start && r->end) {
-			pci_err(dev,
-				"can't enable device: resource collisions\n");
-			return -EINVAL;
-		}
-		if (r->flags & IORESOURCE_IO)
-			cmd |= PCI_COMMAND_IO;
-		if (r->flags & IORESOURCE_MEM)
-			cmd |= PCI_COMMAND_MEMORY;
-	}
-	if (cmd != old_cmd) {
-		pci_info(dev, "enabling device (%04x -> %04x)\n", old_cmd, cmd);
-		pci_write_config_word(dev, PCI_COMMAND, cmd);
-	}
-	return 0;
-}
-
 int pcibios_enable_device(struct pci_dev *dev, int mask)
 {
-	int err = pcibios_enable_resources(dev, mask);
+	int err;
 
+	err = pci_enable_resources(dev, mask);
 	if (err < 0)
 		return err;
 

arch/powerpc/kernel/eeh_driver.c

···
 	rc = driver->err_handler->error_detected(pdev, pci_channel_io_frozen);
 
 	edev->in_error = true;
-	pci_uevent_ers(pdev, PCI_ERS_RESULT_NONE);
+	pci_uevent_ers(pdev, rc);
 	return rc;
 }
 

arch/s390/pci/pci_event.c

···
 	pci_ers_result_t ers_res = PCI_ERS_RESULT_DISCONNECT;
 
 	ers_res = driver->err_handler->error_detected(pdev,  pdev->error_state);
+	pci_uevent_ers(pdev, ers_res);
 	if (ers_result_indicates_abort(ers_res))
 		pr_info("%s: Automatic recovery failed after initial reporting\n", pci_name(pdev));
 	else if (ers_res == PCI_ERS_RESULT_NEED_RESET)
···
 		ers_res = PCI_ERS_RESULT_RECOVERED;
 
 	if (ers_res != PCI_ERS_RESULT_RECOVERED) {
+		pci_uevent_ers(pdev, PCI_ERS_RESULT_DISCONNECT);
 		pr_err("%s: Automatic recovery failed; operator intervention is required\n",
 		       pci_name(pdev));
 		status_str = "failed (driver can't recover)";
···
 	pr_info("%s: The device is ready to resume operations\n", pci_name(pdev));
 	if (driver->err_handler->resume)
 		driver->err_handler->resume(pdev);
+	pci_uevent_ers(pdev, PCI_ERS_RESULT_RECOVERED);
 out_unlock:
 	pci_dev_unlock(pdev);
 	zpci_report_status(zdev, "recovery", status_str);

arch/sparc/kernel/leon_pci.c

···
 	pci_assign_unassigned_resources();
 	pci_bus_add_devices(root_bus);
 }
-
-int pcibios_enable_device(struct pci_dev *dev, int mask)
-{
-	struct resource *res;
-	u16 cmd, oldcmd;
-	int i;
-
-	pci_read_config_word(dev, PCI_COMMAND, &cmd);
-	oldcmd = cmd;
-
-	pci_dev_for_each_resource(dev, res, i) {
-		/* Only set up the requested stuff */
-		if (!(mask & (1<<i)))
-			continue;
-
-		if (res->flags & IORESOURCE_IO)
-			cmd |= PCI_COMMAND_IO;
-		if (res->flags & IORESOURCE_MEM)
-			cmd |= PCI_COMMAND_MEMORY;
-	}
-
-	if (cmd != oldcmd) {
-		pci_info(dev, "enabling device (%04x -> %04x)\n", oldcmd, cmd);
-		pci_write_config_word(dev, PCI_COMMAND, cmd);
-	}
-	return 0;
-}

arch/sparc/kernel/pci.c

···
 	return bus;
 }
 
-int pcibios_enable_device(struct pci_dev *dev, int mask)
-{
-	struct resource *res;
-	u16 cmd, oldcmd;
-	int i;
-
-	pci_read_config_word(dev, PCI_COMMAND, &cmd);
-	oldcmd = cmd;
-
-	pci_dev_for_each_resource(dev, res, i) {
-		/* Only set up the requested stuff */
-		if (!(mask & (1<<i)))
-			continue;
-
-		if (res->flags & IORESOURCE_IO)
-			cmd |= PCI_COMMAND_IO;
-		if (res->flags & IORESOURCE_MEM)
-			cmd |= PCI_COMMAND_MEMORY;
-	}
-
-	if (cmd != oldcmd) {
-		pci_info(dev, "enabling device (%04x -> %04x)\n", oldcmd, cmd);
-		pci_write_config_word(dev, PCI_COMMAND, cmd);
-	}
-	return 0;
-}
-
 /* Platform support for /proc/bus/pci/X/Y mmap()s. */
 int pci_iobar_pfn(struct pci_dev *pdev, int bar, struct vm_area_struct *vma)
 {

arch/sparc/kernel/pcic.c

···
 	}
 }
 
-int pcibios_enable_device(struct pci_dev *dev, int mask)
-{
-	struct resource *res;
-	u16 cmd, oldcmd;
-	int i;
-
-	pci_read_config_word(dev, PCI_COMMAND, &cmd);
-	oldcmd = cmd;
-
-	pci_dev_for_each_resource(dev, res, i) {
-		/* Only set up the requested stuff */
-		if (!(mask & (1<<i)))
-			continue;
-
-		if (res->flags & IORESOURCE_IO)
-			cmd |= PCI_COMMAND_IO;
-		if (res->flags & IORESOURCE_MEM)
-			cmd |= PCI_COMMAND_MEMORY;
-	}
-
-	if (cmd != oldcmd) {
-		pci_info(dev, "enabling device (%04x -> %04x)\n", oldcmd, cmd);
-		pci_write_config_word(dev, PCI_COMMAND, cmd);
-	}
-	return 0;
-}
-
 /* Makes compiler happy */
 static volatile int pcic_timer_dummy;
 

arch/x86/pci/fixup.c

···
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_MCH_PC1,	pcie_rootport_aspm_quirk);
 
 /*
+ * PCIe devices underneath Xeon 6 PCIe Root Port bifurcated to x2 have lower
+ * performance with Extended Tags and MRRS > 128B. Work around the performance
+ * problems by disabling Extended Tags and limiting MRRS to 128B.
+ *
+ * https://cdrdv2.intel.com/v1/dl/getContent/837176
+ */
+static int limit_mrrs_to_128(struct pci_host_bridge *b, struct pci_dev *pdev)
+{
+	int readrq = pcie_get_readrq(pdev);
+
+	if (readrq > 128)
+		pcie_set_readrq(pdev, 128);
+
+	return 0;
+}
+
+static void pci_xeon_x2_bifurc_quirk(struct pci_dev *pdev)
+{
+	struct pci_host_bridge *bridge = pci_find_host_bridge(pdev->bus);
+	u32 linkcap;
+
+	pcie_capability_read_dword(pdev, PCI_EXP_LNKCAP, &linkcap);
+	if (FIELD_GET(PCI_EXP_LNKCAP_MLW, linkcap) != 0x2)
+		return;
+
+	bridge->no_ext_tags = 1;
+	bridge->enable_device = limit_mrrs_to_128;
+	pci_info(pdev, "Disabling Extended Tags and limiting MRRS to 128B (performance reasons due to x2 PCIe link)\n");
+}
+
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x0db0, pci_xeon_x2_bifurc_quirk);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x0db1, pci_xeon_x2_bifurc_quirk);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x0db2, pci_xeon_x2_bifurc_quirk);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x0db3, pci_xeon_x2_bifurc_quirk);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x0db6, pci_xeon_x2_bifurc_quirk);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x0db7, pci_xeon_x2_bifurc_quirk);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x0db8, pci_xeon_x2_bifurc_quirk);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x0db9, pci_xeon_x2_bifurc_quirk);
+
+/*
  * Fixup to mark boot BIOS video selected by BIOS before it changes
  *
  * From information provided by "Jon Smirl" <[e-mail]>

drivers/misc/pci_endpoint_test.c

···
 {
 	struct pci_dev *pdev = test->pdev;
 	u32 val;
-	int ret;
+	int irq;
+
+	irq = pci_irq_vector(pdev, msi_num - 1);
+	if (irq < 0)
+		return irq;
 
 	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_TYPE,
 				 msix ? PCITEST_IRQ_TYPE_MSIX :
···
 	if (!val)
 		return -ETIMEDOUT;
 
-	ret = pci_irq_vector(pdev, msi_num - 1);
-	if (ret < 0)
-		return ret;
-
-	if (ret != test->last_irq)
+	if (irq != test->last_irq)
 		return -EIO;
 
 	return 0;
···
 	switch (cmd) {
 	case PCITEST_BAR:
 		bar = arg;
-		if (bar > BAR_5)
+		if (bar <= NO_BAR || bar > BAR_5)
 			goto ret;
 		if (is_am654_pci_dev(pdev) && bar == BAR_0)
 			goto ret;
···
 	if (!test)
 		return -ENOMEM;
 
-	test->test_reg_bar = 0;
-	test->alignment = 0;
 	test->pdev = pdev;
 	test->irq_type = PCITEST_IRQ_TYPE_UNDEFINED;
 

drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c

···
 	struct qlcnic_adapter *adapter = pci_get_drvdata(pdev);
 	int err = 0;
 
-	pdev->error_state = pci_channel_io_normal;
 	err = pci_enable_device(pdev);
 	if (err)
 		goto disconnect;

drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c

···
 	struct qlcnic_adapter *adapter = pci_get_drvdata(pdev);
 	struct net_device *netdev = adapter->netdev;
 
-	pdev->error_state = pci_channel_io_normal;
-
 	err = pci_enable_device(pdev);
 	if (err)
 		return err;

drivers/net/ethernet/sfc/efx_common.c

···
 
 /* For simplicity and reliability, we always require a slot reset and try to
  * reset the hardware when a pci error affecting the device is detected.
- * We leave both the link_reset and mmio_enabled callback unimplemented:
- * with our request for slot reset the mmio_enabled callback will never be
- * called, and the link_reset callback is not used by AER or EEH mechanisms.
  */
 const struct pci_error_handlers efx_err_handlers = {
 	.error_detected = efx_io_error_detected,

drivers/net/ethernet/sfc/falcon/efx.c

···
 
 /* For simplicity and reliability, we always require a slot reset and try to
  * reset the hardware when a pci error affecting the device is detected.
- * We leave both the link_reset and mmio_enabled callback unimplemented:
- * with our request for slot reset the mmio_enabled callback will never be
- * called, and the link_reset callback is not used by AER or EEH mechanisms.
  */
 static const struct pci_error_handlers ef4_err_handlers = {
 	.error_detected = ef4_io_error_detected,

drivers/net/ethernet/sfc/siena/efx_common.c

···
 
 /* For simplicity and reliability, we always require a slot reset and try to
  * reset the hardware when a pci error affecting the device is detected.
- * We leave both the link_reset and mmio_enabled callback unimplemented:
- * with our request for slot reset the mmio_enabled callback will never be
- * called, and the link_reset callback is not used by AER or EEH mechanisms.
  */
 const struct pci_error_handlers efx_siena_err_handlers = {
 	.error_detected = efx_io_error_detected,

drivers/pci/bus.c

···
 		if (!r)
 			continue;
 
+		if (r->flags & (IORESOURCE_UNSET|IORESOURCE_DISABLED))
+			continue;
+
 		/* type_mask must match */
 		if ((res->flags ^ r->flags) & type_mask)
 			continue;
···
 	 * before PCI client drivers.
 	 */
 	pdev = of_find_device_by_node(dn);
-	if (pdev && of_pci_supply_present(dn)) {
-		if (!device_link_add(&dev->dev, &pdev->dev,
-				     DL_FLAG_AUTOREMOVE_CONSUMER))
-			pci_err(dev, "failed to add device link to power control device %s\n",
-				pdev->name);
+	if (pdev) {
+		if (of_pci_supply_present(dn)) {
+			if (!device_link_add(&dev->dev, &pdev->dev,
+					     DL_FLAG_AUTOREMOVE_CONSUMER)) {
+				pci_err(dev, "failed to add device link to power control device %s\n",
+					pdev->name);
+			}
+		}
+		put_device(&pdev->dev);
 	}
 
 	if (!dn || of_device_is_available(dn))

drivers/pci/controller/cadence/Kconfig

···
 	  endpoint mode. This PCIe controller may be embedded into many
 	  different vendors SoCs.
 
+config PCIE_SG2042_HOST
+	tristate "Sophgo SG2042 PCIe controller (host mode)"
+	depends on OF && (ARCH_SOPHGO || COMPILE_TEST)
+	select PCIE_CADENCE_HOST
+	help
+	  Say Y here if you want to support the Sophgo SG2042 PCIe platform
+	  controller in host mode. Sophgo SG2042 PCIe controller uses Cadence
+	  PCIe core.
+
 config PCI_J721E
 	tristate
 	select PCIE_CADENCE_HOST if PCI_J721E_HOST != n
···
 	  Say Y here if you want to support the TI J721E PCIe platform
 	  controller in endpoint mode. TI J721E PCIe controller uses Cadence PCIe
 	  core.
+
 endmenu

drivers/pci/controller/cadence/Makefile

···
 obj-$(CONFIG_PCIE_CADENCE_EP) += pcie-cadence-ep.o
 obj-$(CONFIG_PCIE_CADENCE_PLAT) += pcie-cadence-plat.o
 obj-$(CONFIG_PCI_J721E) += pci-j721e.o
+obj-$(CONFIG_PCIE_SG2042_HOST) += pcie-sg2042.o

drivers/pci/controller/cadence/pci-j721e.c

···
 	if (!ret)
 		offset = args.args[0];
 
+	/*
+	 * The PCIe Controller's registers have different "reset-values"
+	 * depending on the "strap" settings programmed into the PCIEn_CTRL
+	 * register within the CTRL_MMR memory-mapped register space.
+	 * The registers latch onto a "reset-value" based on the "strap"
+	 * settings sampled after the PCIe Controller is powered on.
+	 * To ensure that the "reset-values" are sampled accurately, power
+	 * off the PCIe Controller before programming the "strap" settings
+	 * and power it on after that. The runtime PM APIs namely
+	 * pm_runtime_put_sync() and pm_runtime_get_sync() will decrement and
+	 * increment the usage counter respectively, causing GENPD to power off
+	 * and power on the PCIe Controller.
+	 */
+	ret = pm_runtime_put_sync(dev);
+	if (ret < 0) {
+		dev_err(dev, "Failed to power off PCIe Controller\n");
+		return ret;
+	}
+
 	ret = j721e_pcie_set_mode(pcie, syscon, offset);
 	if (ret < 0) {
 		dev_err(dev, "Failed to set pci mode\n");
···
 	ret = j721e_pcie_set_lane_count(pcie, syscon, offset);
 	if (ret < 0) {
 		dev_err(dev, "Failed to set num-lanes\n");
+		return ret;
+	}
+
+	ret = pm_runtime_get_sync(dev);
+	if (ret < 0) {
+		dev_err(dev, "Failed to power on PCIe Controller\n");
 		return ret;
 	}
 
···
 	},
 	{},
 };
+MODULE_DEVICE_TABLE(of, of_j721e_pcie_match);
 
 static int j721e_pcie_probe(struct platform_device *pdev)
 {
···
 
 	ret = j721e_pcie_ctrl_init(pcie);
 	if (ret < 0) {
-		dev_err_probe(dev, ret, "pm_runtime_get_sync failed\n");
+		dev_err_probe(dev, ret, "j721e_pcie_ctrl_init failed\n");
 		goto err_get_sync;
 	}
 

drivers/pci/controller/cadence/pcie-cadence-ep.c

···
 
 static u8 cdns_pcie_get_fn_from_vfn(struct cdns_pcie *pcie, u8 fn, u8 vfn)
 {
-	u32 cap = CDNS_PCIE_EP_FUNC_SRIOV_CAP_OFFSET;
 	u32 first_vf_offset, stride;
+	u16 cap;
 
 	if (vfn == 0)
 		return fn;
 
+	cap = cdns_pcie_find_ext_capability(pcie, PCI_EXT_CAP_ID_SRIOV);
 	first_vf_offset = cdns_pcie_ep_fn_readw(pcie, fn, cap + PCI_SRIOV_VF_OFFSET);
 	stride = cdns_pcie_ep_fn_readw(pcie, fn, cap +  PCI_SRIOV_VF_STRIDE);
 	fn = fn + first_vf_offset + ((vfn - 1) * stride);
···
 				     struct pci_epf_header *hdr)
 {
 	struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
-	u32 cap = CDNS_PCIE_EP_FUNC_SRIOV_CAP_OFFSET;
 	struct cdns_pcie *pcie = &ep->pcie;
 	u32 reg;
+	u16 cap;
 
+	cap = cdns_pcie_find_ext_capability(pcie, PCI_EXT_CAP_ID_SRIOV);
 	if (vfn > 1) {
 		dev_err(&epc->dev, "Only Virtual Function #1 has deviceID\n");
 		return -EINVAL;
···
 	struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
 	struct cdns_pcie *pcie = &ep->pcie;
 	u8 mmc = order_base_2(nr_irqs);
-	u32 cap = CDNS_PCIE_EP_FUNC_MSI_CAP_OFFSET;
 	u16 flags;
+	u8 cap;
 
+	cap = cdns_pcie_find_capability(pcie, PCI_CAP_ID_MSI);
 	fn = cdns_pcie_get_fn_from_vfn(pcie, fn, vfn);
 
 	/*
···
 {
 	struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
 	struct cdns_pcie *pcie = &ep->pcie;
-	u32 cap = CDNS_PCIE_EP_FUNC_MSI_CAP_OFFSET;
 	u16 flags, mme;
+	u8 cap;
 
+	cap = cdns_pcie_find_capability(pcie, PCI_CAP_ID_MSIX);
 	fn = cdns_pcie_get_fn_from_vfn(pcie, fn, vfn);
 
 	/* Validate that the MSI feature is actually enabled. */
···
 {
 	struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
 	struct cdns_pcie *pcie = &ep->pcie;
-	u32 cap = CDNS_PCIE_EP_FUNC_MSIX_CAP_OFFSET;
 	u32 val, reg;
+	u8 cap;
 
+	cap = cdns_pcie_find_capability(pcie, PCI_CAP_ID_MSIX);
 	func_no = cdns_pcie_get_fn_from_vfn(pcie, func_no, vfunc_no);
 
 	reg = cap + PCI_MSIX_FLAGS;
···
 {
 	struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
 	struct cdns_pcie *pcie = &ep->pcie;
-	u32 cap = CDNS_PCIE_EP_FUNC_MSIX_CAP_OFFSET;
 	u32 val, reg;
+	u8 cap;
 
+	cap = cdns_pcie_find_capability(pcie, PCI_CAP_ID_MSIX);
 	fn = cdns_pcie_get_fn_from_vfn(pcie, fn, vfn);
 
 	reg = cap + PCI_MSIX_FLAGS;
···
 				     u8 interrupt_num)
 {
 	struct cdns_pcie *pcie = &ep->pcie;
-	u32 cap = CDNS_PCIE_EP_FUNC_MSI_CAP_OFFSET;
 	u16 flags, mme, data, data_mask;
-	u8 msi_count;
 	u64 pci_addr, pci_addr_mask = 0xff;
+	u8 msi_count, cap;
 
+	cap = cdns_pcie_find_capability(pcie, PCI_CAP_ID_MSI);
 	fn = cdns_pcie_get_fn_from_vfn(pcie, fn, vfn);
 
 	/* Check whether the MSI feature has been enabled by the PCI host. */
···
 				    u32 *msi_addr_offset)
 {
 	struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
-	u32 cap = CDNS_PCIE_EP_FUNC_MSI_CAP_OFFSET;
 	struct cdns_pcie *pcie = &ep->pcie;
 	u64 pci_addr, pci_addr_mask = 0xff;
 	u16 flags, mme, data, data_mask;
-	u8 msi_count;
+	u8 msi_count, cap;
 	int ret;
 	int i;
 
+	cap = cdns_pcie_find_capability(pcie, PCI_CAP_ID_MSI);
 	fn = cdns_pcie_get_fn_from_vfn(pcie, fn, vfn);
 
 	/* Check whether the MSI feature has been enabled by the PCI host. */
···
 static int cdns_pcie_ep_send_msix_irq(struct cdns_pcie_ep *ep, u8 fn, u8 vfn,
 				      u16 interrupt_num)
 {
-	u32 cap = CDNS_PCIE_EP_FUNC_MSIX_CAP_OFFSET;
 	u32 tbl_offset, msg_data, reg;
 	struct cdns_pcie *pcie = &ep->pcie;
 	struct pci_epf_msix_tbl *msix_tbl;
 	struct cdns_pcie_epf *epf;
 	u64 pci_addr_mask = 0xff;
 	u64 msg_addr;
+	u8 bir, cap;
 	u16 flags;
-	u8 bir;
 
+	cap = cdns_pcie_find_capability(pcie, PCI_CAP_ID_MSIX);
 	epf = &ep->epf[fn];
 	if (vfn > 0)
 		epf = &epf->epf[vfn - 1];
···
 	int max_epfs = sizeof(epc->function_num_map) * 8;
 	int ret, epf, last_fn;
 	u32 reg, value;
+	u8 cap;
 
+	cap = cdns_pcie_find_capability(pcie, PCI_CAP_ID_EXP);
 	/*
 	 * BIT(0) is hardwired to 1, hence function 0 is always enabled
 	 * and can't be disabled anyway.
···
 				continue;
 
 			value = cdns_pcie_ep_fn_readl(pcie, epf,
-					CDNS_PCIE_EP_FUNC_DEV_CAP_OFFSET +
-					PCI_EXP_DEVCAP);
+						      cap + PCI_EXP_DEVCAP);
 			value &= ~PCI_EXP_DEVCAP_FLR;
 			cdns_pcie_ep_fn_writel(pcie, epf,
-					CDNS_PCIE_EP_FUNC_DEV_CAP_OFFSET +
-					PCI_EXP_DEVCAP, value);
+					       cap + PCI_EXP_DEVCAP, value);
 		}
 	}
 
···
 }
 
 static const struct pci_epc_features cdns_pcie_epc_vf_features = {
-	.linkup_notifier = false,
 	.msi_capable = true,
 	.msix_capable = true,
 	.align = 65536,
 };
 
 static const struct pci_epc_features cdns_pcie_epc_features = {
-	.linkup_notifier = false,
 	.msi_capable = true,
 	.msix_capable = true,
 	.align = 256,

drivers/pci/controller/cadence/pcie-cadence-host.c

···
 	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_PCI_ADDR1(0), addr1);
 	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_DESC1(0), desc1);
 
-	if (pcie->ops->cpu_addr_fixup)
+	if (pcie->ops && pcie->ops->cpu_addr_fixup)
 		cpu_addr = pcie->ops->cpu_addr_fixup(pcie, cpu_addr);
 
 	addr0 = CDNS_PCIE_AT_OB_REGION_CPU_ADDR0_NBITS(12) |

drivers/pci/controller/cadence/pcie-cadence.c

···
 #include <linux/of.h>
 
 #include "pcie-cadence.h"
+#include "../../pci.h"
+
+u8 cdns_pcie_find_capability(struct cdns_pcie *pcie, u8 cap)
+{
+	return PCI_FIND_NEXT_CAP(cdns_pcie_read_cfg, PCI_CAPABILITY_LIST,
+				 cap, pcie);
+}
+EXPORT_SYMBOL_GPL(cdns_pcie_find_capability);
+
+u16 cdns_pcie_find_ext_capability(struct cdns_pcie *pcie, u8 cap)
+{
+	return PCI_FIND_NEXT_EXT_CAP(cdns_pcie_read_cfg, 0, cap, pcie);
+}
+EXPORT_SYMBOL_GPL(cdns_pcie_find_ext_capability);
 
 void cdns_pcie_detect_quiet_min_delay_set(struct cdns_pcie *pcie)
 {
···
 	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_DESC1(r), desc1);
 
 	/* Set the CPU address */
-	if (pcie->ops->cpu_addr_fixup)
+	if (pcie->ops && pcie->ops->cpu_addr_fixup)
 		cpu_addr = pcie->ops->cpu_addr_fixup(pcie, cpu_addr);
 
 	addr0 = CDNS_PCIE_AT_OB_REGION_CPU_ADDR0_NBITS(nbits) |
···
 	}
 
 	/* Set the CPU address */
-	if (pcie->ops->cpu_addr_fixup)
+	if (pcie->ops && pcie->ops->cpu_addr_fixup)
 		cpu_addr = pcie->ops->cpu_addr_fixup(pcie, cpu_addr);
 
 	addr0 = CDNS_PCIE_AT_OB_REGION_CPU_ADDR0_NBITS(17) |

drivers/pci/controller/cadence/pcie-cadence.h

···
  */
 #define CDNS_PCIE_EP_FUNC_BASE(fn)	(((fn) << 12) & GENMASK(19, 12))
 
-#define CDNS_PCIE_EP_FUNC_MSI_CAP_OFFSET	0x90
-#define CDNS_PCIE_EP_FUNC_MSIX_CAP_OFFSET	0xb0
-#define CDNS_PCIE_EP_FUNC_DEV_CAP_OFFSET	0xc0
-#define CDNS_PCIE_EP_FUNC_SRIOV_CAP_OFFSET	0x200
-
 /*
  * Endpoint PF Registers
  */
···
 	return readl(pcie->reg_base + reg);
 }
 
+static inline u16 cdns_pcie_readw(struct cdns_pcie *pcie, u32 reg)
+{
+	return readw(pcie->reg_base + reg);
+}
+
+static inline u8 cdns_pcie_readb(struct cdns_pcie *pcie, u32 reg)
+{
+	return readb(pcie->reg_base + reg);
+}
+
+static inline int cdns_pcie_read_cfg_byte(struct cdns_pcie *pcie, int where,
+					  u8 *val)
+{
+	*val = cdns_pcie_readb(pcie, where);
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static inline int cdns_pcie_read_cfg_word(struct cdns_pcie *pcie, int where,
+					  u16 *val)
+{
+	*val = cdns_pcie_readw(pcie, where);
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static inline int cdns_pcie_read_cfg_dword(struct cdns_pcie *pcie, int where,
+					   u32 *val)
+{
+	*val = cdns_pcie_readl(pcie, where);
+	return PCIBIOS_SUCCESSFUL;
+}
+
 static inline u32 cdns_pcie_read_sz(void __iomem *addr, int size)
 {
 	void __iomem *aligned_addr = PTR_ALIGN_DOWN(addr, 0x4);
···
 
 static inline int cdns_pcie_start_link(struct cdns_pcie *pcie)
 {
-	if (pcie->ops->start_link)
+	if (pcie->ops && pcie->ops->start_link)
 		return pcie->ops->start_link(pcie);
 
 	return 0;
···
 
 static inline void cdns_pcie_stop_link(struct cdns_pcie *pcie)
 {
-	if (pcie->ops->stop_link)
+	if (pcie->ops && pcie->ops->stop_link)
 		pcie->ops->stop_link(pcie);
 }
 
 static inline bool cdns_pcie_link_up(struct cdns_pcie *pcie)
 {
-	if (pcie->ops->link_up)
+	if (pcie->ops && pcie->ops->link_up)
 		return pcie->ops->link_up(pcie);
 
 	return true;
···
 {
 }
 #endif
+
+u8 cdns_pcie_find_capability(struct cdns_pcie *pcie, u8 cap);
+u16 cdns_pcie_find_ext_capability(struct cdns_pcie *pcie, u8 cap);
 
 void cdns_pcie_detect_quiet_min_delay_set(struct cdns_pcie *pcie);
 

drivers/pci/controller/cadence/pcie-sg2042.c

···
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * pcie-sg2042 - PCIe controller driver for Sophgo SG2042 SoC
+ *
+ * Copyright (C) 2025 Sophgo Technology Inc.
+ * Copyright (C) 2025 Chen Wang <[e-mail]>
+ */
+
+#include <linux/mod_devicetable.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+#include "pcie-cadence.h"
+
+/*
+ * SG2042 only supports 4-byte aligned access, so for the rootbus (i.e. to
+ * read/write the Root Port itself, read32/write32 is required. For
+ * non-rootbus (i.e. to read/write the PCIe peripheral registers, supports
+ * 1/2/4 byte aligned access, so directly using read/write should be fine.
+ */
+
+static struct pci_ops sg2042_pcie_root_ops = {
+	.map_bus	= cdns_pci_map_bus,
+	.read		= pci_generic_config_read32,
+	.write		= pci_generic_config_write32,
+};
+
+static struct pci_ops sg2042_pcie_child_ops = {
+	.map_bus	= cdns_pci_map_bus,
+	.read		= pci_generic_config_read,
+	.write		= pci_generic_config_write,
+};
+
+static int sg2042_pcie_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct pci_host_bridge *bridge;
+	struct cdns_pcie *pcie;
+	struct cdns_pcie_rc *rc;
+	int ret;
+
+	bridge = devm_pci_alloc_host_bridge(dev, sizeof(*rc));
+	if (!bridge)
+		return dev_err_probe(dev, -ENOMEM, "Failed to alloc host bridge!\n");
+
+	bridge->ops = &sg2042_pcie_root_ops;
+	bridge->child_ops = &sg2042_pcie_child_ops;
+
+	rc = pci_host_bridge_priv(bridge);
+	pcie = &rc->pcie;
+	pcie->dev = dev;
+
+	platform_set_drvdata(pdev, pcie);
+
+	pm_runtime_set_active(dev);
+	pm_runtime_no_callbacks(dev);
+	devm_pm_runtime_enable(dev);
+
+	ret = cdns_pcie_init_phy(dev, pcie);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to init phy!\n");
+
+	ret = cdns_pcie_host_setup(rc);
+	if (ret) {
+		dev_err_probe(dev, ret, "Failed to setup host!\n");
+		cdns_pcie_disable_phy(pcie);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void sg2042_pcie_remove(struct platform_device *pdev)
+{
+	struct cdns_pcie *pcie = platform_get_drvdata(pdev);
+	struct device *dev = &pdev->dev;
+	struct cdns_pcie_rc *rc;
+
+	rc = container_of(pcie, struct cdns_pcie_rc, pcie);
+	cdns_pcie_host_disable(rc);
+
+	cdns_pcie_disable_phy(pcie);
+
+	pm_runtime_disable(dev);
+}
+
+static int sg2042_pcie_suspend_noirq(struct device *dev)
+{
+	struct cdns_pcie *pcie = dev_get_drvdata(dev);
+
+	cdns_pcie_disable_phy(pcie);
+
+	return 0;
+}
+
+static int sg2042_pcie_resume_noirq(struct device *dev)
+{
+	struct cdns_pcie *pcie = dev_get_drvdata(dev);
+	int ret;
+
+	ret = cdns_pcie_enable_phy(pcie);
+	if (ret) {
+		dev_err(dev, "failed to enable PHY\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static DEFINE_NOIRQ_DEV_PM_OPS(sg2042_pcie_pm_ops,
+			       sg2042_pcie_suspend_noirq,
+			       sg2042_pcie_resume_noirq);
+
+static const struct of_device_id sg2042_pcie_of_match[] = {
+	{ .compatible = "sophgo,sg2042-pcie-host" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, sg2042_pcie_of_match);
+
+static struct platform_driver sg2042_pcie_driver = {
+	.driver = {
+		.name		= "sg2042-pcie",
+		.of_match_table	= sg2042_pcie_of_match,
+		.pm		= pm_sleep_ptr(&sg2042_pcie_pm_ops),
+	},
+	.probe		= sg2042_pcie_probe,
+	.remove		= sg2042_pcie_remove,
+};
+module_platform_driver(sg2042_pcie_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("PCIe controller driver for SG2042 SoCs");
+MODULE_AUTHOR("Chen Wang <[e-mail]>");

drivers/pci/controller/dwc/Kconfig

···
 	bool
 	select PCIE_DW
 	select IRQ_MSI_LIB
+	select PCI_HOST_COMMON
 
 config PCIE_DW_EP
 	bool
···
 	select CRC8
 	select PCIE_QCOM_COMMON
 	select PCI_HOST_COMMON
+	select PCI_PWRCTRL_SLOT
 	help
 	  Say Y here to enable PCIe controller support on Qualcomm SoCs. The
 	  PCIe controller uses the DesignWare core plus Qualcomm-specific
···
 	select PCIE_DW_HOST
 	help
 	  Say Y here if you want PCIe support on SPEAr13XX SoCs.
+
+config PCIE_STM32_HOST
+	tristate "STMicroelectronics STM32MP25 PCIe Controller (host mode)"
+	depends on ARCH_STM32 || COMPILE_TEST
+	depends on PCI_MSI
+	select PCIE_DW_HOST
+	help
+	  Enables Root Complex (RC) support for the DesignWare core based PCIe
+	  controller found in STM32MP25 SoC.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called pcie-stm32.
+
+config PCIE_STM32_EP
+	tristate "STMicroelectronics STM32MP25 PCIe Controller (endpoint mode)"
+	depends on ARCH_STM32 || COMPILE_TEST
+	depends on PCI_ENDPOINT
+	select PCIE_DW_EP
+	help
+	  Enables Endpoint (EP) support for the DesignWare core based PCIe
+	  controller found in STM32MP25 SoC.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called pcie-stm32-ep.
 
 config PCI_DRA7XX
 	tristate

drivers/pci/controller/dwc/Makefile

···
 obj-$(CONFIG_PCIE_UNIPHIER_EP) += pcie-uniphier-ep.o
 obj-$(CONFIG_PCIE_VISCONTI_HOST) += pcie-visconti.o
 obj-$(CONFIG_PCIE_RCAR_GEN4) += pcie-rcar-gen4.o
+obj-$(CONFIG_PCIE_STM32_HOST) += pcie-stm32.o
+obj-$(CONFIG_PCIE_STM32_EP) += pcie-stm32-ep.o
 
 # The following drivers are for devices that use the generic ACPI
 # pci_root.c driver but don't support standard ECAM config access.

drivers/pci/controller/dwc/pci-dra7xx.c

···
 static const struct pci_epc_features dra7xx_pcie_epc_features = {
 	.linkup_notifier = true,
 	.msi_capable = true,
-	.msix_capable = false,
 };
 
 static const struct pci_epc_features*

drivers/pci/controller/dwc/pci-exynos.c

···
 
 struct exynos_pcie {
 	struct dw_pcie			pci;
-	void __iomem			*elbi_base;
 	struct clk_bulk_data		*clks;
 	struct phy			*phy;
 	struct regulator_bulk_data	supplies[2];
···
 
 static void exynos_pcie_sideband_dbi_w_mode(struct exynos_pcie *ep, bool on)
 {
+	struct dw_pcie *pci = &ep->pci;
 	u32 val;
 
-	val = exynos_pcie_readl(ep->elbi_base, PCIE_ELBI_SLV_AWMISC);
+	val = exynos_pcie_readl(pci->elbi_base, PCIE_ELBI_SLV_AWMISC);
 	if (on)
 		val |= PCIE_ELBI_SLV_DBI_ENABLE;
 	else
 		val &= ~PCIE_ELBI_SLV_DBI_ENABLE;
-	exynos_pcie_writel(ep->elbi_base, val, PCIE_ELBI_SLV_AWMISC);
+	exynos_pcie_writel(pci->elbi_base, val, PCIE_ELBI_SLV_AWMISC);
 }
 
 static void exynos_pcie_sideband_dbi_r_mode(struct exynos_pcie *ep, bool on)
 {
+	struct dw_pcie *pci = &ep->pci;
 	u32 val;
 
-	val = exynos_pcie_readl(ep->elbi_base, PCIE_ELBI_SLV_ARMISC);
+	val = exynos_pcie_readl(pci->elbi_base, PCIE_ELBI_SLV_ARMISC);
 	if (on)
 		val |= PCIE_ELBI_SLV_DBI_ENABLE;
 	else
 		val &= ~PCIE_ELBI_SLV_DBI_ENABLE;
-	exynos_pcie_writel(ep->elbi_base, val, PCIE_ELBI_SLV_ARMISC);
+	exynos_pcie_writel(pci->elbi_base, val, PCIE_ELBI_SLV_ARMISC);
 }
 
 static void exynos_pcie_assert_core_reset(struct exynos_pcie *ep)
 {
+	struct dw_pcie *pci = &ep->pci;
 	u32 val;
 
-	val = exynos_pcie_readl(ep->elbi_base, PCIE_CORE_RESET);
+	val = exynos_pcie_readl(pci->elbi_base, PCIE_CORE_RESET);
 	val &= ~PCIE_CORE_RESET_ENABLE;
-	exynos_pcie_writel(ep->elbi_base, val, PCIE_CORE_RESET);
-	exynos_pcie_writel(ep->elbi_base, 0, PCIE_STICKY_RESET);
-	exynos_pcie_writel(ep->elbi_base, 0, PCIE_NONSTICKY_RESET);
+	exynos_pcie_writel(pci->elbi_base, val, PCIE_CORE_RESET);
+	exynos_pcie_writel(pci->elbi_base, 0, PCIE_STICKY_RESET);
+	exynos_pcie_writel(pci->elbi_base, 0, PCIE_NONSTICKY_RESET);
 }
 
 static void exynos_pcie_deassert_core_reset(struct exynos_pcie *ep)
 {
+	struct dw_pcie *pci = &ep->pci;
 	u32 val;
 
-	val = exynos_pcie_readl(ep->elbi_base, PCIE_CORE_RESET);
+	val = exynos_pcie_readl(pci->elbi_base, PCIE_CORE_RESET);
 	val |= PCIE_CORE_RESET_ENABLE;
 
-	exynos_pcie_writel(ep->elbi_base, val, PCIE_CORE_RESET);
-	exynos_pcie_writel(ep->elbi_base, 1, PCIE_STICKY_RESET);
-	exynos_pcie_writel(ep->elbi_base, 1, PCIE_NONSTICKY_RESET);
-	exynos_pcie_writel(ep->elbi_base, 1, PCIE_APP_INIT_RESET);
-	exynos_pcie_writel(ep->elbi_base, 0, PCIE_APP_INIT_RESET);
+	exynos_pcie_writel(pci->elbi_base, val, PCIE_CORE_RESET);
+	exynos_pcie_writel(pci->elbi_base, 1, PCIE_STICKY_RESET);
+	exynos_pcie_writel(pci->elbi_base, 1, PCIE_NONSTICKY_RESET);
+	exynos_pcie_writel(pci->elbi_base, 1, PCIE_APP_INIT_RESET);
+	exynos_pcie_writel(pci->elbi_base, 0, PCIE_APP_INIT_RESET);
 }
 
 static int exynos_pcie_start_link(struct dw_pcie *pci)
 {
-	struct exynos_pcie *ep = to_exynos_pcie(pci);
 	u32 val;
 
-	val = exynos_pcie_readl(ep->elbi_base, PCIE_SW_WAKE);
+	val = exynos_pcie_readl(pci->elbi_base, PCIE_SW_WAKE);
 	val &= ~PCIE_BUS_EN;
-	exynos_pcie_writel(ep->elbi_base, val, PCIE_SW_WAKE);
+	exynos_pcie_writel(pci->elbi_base, val, PCIE_SW_WAKE);
 
 	/* assert LTSSM enable */
-	exynos_pcie_writel(ep->elbi_base, PCIE_ELBI_LTSSM_ENABLE,
+	exynos_pcie_writel(pci->elbi_base, PCIE_ELBI_LTSSM_ENABLE,
 			  PCIE_APP_LTSSM_ENABLE);
 	return 0;
 }
 
 static void exynos_pcie_clear_irq_pulse(struct exynos_pcie *ep)
 {
-	u32 val = exynos_pcie_readl(ep->elbi_base, PCIE_IRQ_PULSE);
+	struct dw_pcie *pci = &ep->pci;
 
-	exynos_pcie_writel(ep->elbi_base, val, PCIE_IRQ_PULSE);
+	u32 val = exynos_pcie_readl(pci->elbi_base, PCIE_IRQ_PULSE);
+
+	exynos_pcie_writel(pci->elbi_base, val, PCIE_IRQ_PULSE);
 }
 
 static irqreturn_t exynos_pcie_irq_handler(int irq, void *arg)
···
 
 static void exynos_pcie_enable_irq_pulse(struct exynos_pcie *ep)
 {
+	struct dw_pcie *pci = &ep->pci;
+
 	u32 val = IRQ_INTA_ASSERT | IRQ_INTB_ASSERT |
 		  IRQ_INTC_ASSERT | IRQ_INTD_ASSERT;
 
-	exynos_pcie_writel(ep->elbi_base, val, PCIE_IRQ_EN_PULSE);
-	exynos_pcie_writel(ep->elbi_base, 0, PCIE_IRQ_EN_LEVEL);
-	exynos_pcie_writel(ep->elbi_base, 0, PCIE_IRQ_EN_SPECIAL);
+	exynos_pcie_writel(pci->elbi_base, val, PCIE_IRQ_EN_PULSE);
+	exynos_pcie_writel(pci->elbi_base, 0, PCIE_IRQ_EN_LEVEL);
+	exynos_pcie_writel(pci->elbi_base, 0, PCIE_IRQ_EN_SPECIAL);
 }
 
 static u32 exynos_pcie_read_dbi(struct dw_pcie *pci, void __iomem *base,
···
 
 static bool exynos_pcie_link_up(struct dw_pcie *pci)
 {
-	struct exynos_pcie *ep = to_exynos_pcie(pci);
-	u32 val = exynos_pcie_readl(ep->elbi_base, PCIE_ELBI_RDLH_LINKUP);
+	u32 val = exynos_pcie_readl(pci->elbi_base, PCIE_ELBI_RDLH_LINKUP);
 
 	return val & PCIE_ELBI_XMLH_LINKUP;
 }
···
 	ep->phy = devm_of_phy_get(dev, np, NULL);
 	if (IS_ERR(ep->phy))
 		return PTR_ERR(ep->phy);
-
-	/* External Local Bus interface (ELBI) registers */
-	ep->elbi_base = devm_platform_ioremap_resource_byname(pdev, "elbi");
-	if (IS_ERR(ep->elbi_base))
-		return PTR_ERR(ep->elbi_base);
 
 	ret = devm_clk_bulk_get_all_enabled(dev, &ep->clks);
 	if (ret < 0)

drivers/pci/controller/dwc/pci-imx6.c

···
 }
 
 static const struct pci_epc_features imx8m_pcie_epc_features = {
-	.linkup_notifier = false,
 	.msi_capable = true,
-	.msix_capable = false,
 	.bar[BAR_1] = { .type = BAR_RESERVED, },
 	.bar[BAR_3] = { .type = BAR_RESERVED, },
 	.bar[BAR_4] = { .type = BAR_FIXED, .fixed_size = SZ_256, },
···
 };
 
 static const struct pci_epc_features imx8q_pcie_epc_features = {
-	.linkup_notifier = false,
 	.msi_capable = true,
-	.msix_capable = false,
 	.bar[BAR_1] = { .type = BAR_RESERVED, },
 	.bar[BAR_3] = { .type = BAR_RESERVED, },
 	.bar[BAR_5] = { .type = BAR_RESERVED, },
···
 	/* Limit link speed */
 	pci->max_link_speed = 1;
 	of_property_read_u32(node, "fsl,max-link-speed", &pci->max_link_speed);
+
+	ret = devm_regulator_get_enable_optional(&pdev->dev, "vpcie3v3aux");
+	if (ret < 0 && ret != -ENODEV)
+		return dev_err_probe(dev, ret, "failed to enable Vaux supply\n");
 
 	imx_pcie->vpcie = devm_regulator_get_optional(&pdev->dev, "vpcie");
 	if (IS_ERR(imx_pcie->vpcie)) {

drivers/pci/controller/dwc/pci-keystone.c

···
 }
 
 static const struct pci_epc_features ks_pcie_am654_epc_features = {
-	.linkup_notifier = false,
 	.msi_capable = true,
 	.msix_capable = true,
 	.bar[BAR_0] = { .type = BAR_RESERVED, },
···
 	if (irq < 0)
 		return irq;
 
-	ret = request_irq(irq, ks_pcie_err_irq_handler, IRQF_SHARED,
-			  "ks-pcie-error-irq", ks_pcie);
+	ret = devm_request_irq(dev, irq, ks_pcie_err_irq_handler, IRQF_SHARED,
+			       "ks-pcie-error-irq", ks_pcie);
 	if (ret < 0) {
 		dev_err(dev, "failed to request error IRQ %d\n",
 			irq);
···
 	if (ret)
 		num_lanes = 1;
 
-	phy = devm_kzalloc(dev, sizeof(*phy) * num_lanes, GFP_KERNEL);
+	phy = devm_kcalloc(dev, num_lanes, sizeof(*phy), GFP_KERNEL);
 	if (!phy)
 		return -ENOMEM;
 
-	link = devm_kzalloc(dev, sizeof(*link) * num_lanes, GFP_KERNEL);
+	link = devm_kcalloc(dev, num_lanes, sizeof(*link), GFP_KERNEL);
 	if (!link)
 		return -ENOMEM;
 

drivers/pci/controller/dwc/pcie-al.c

···
 		return -ENOENT;
 	}
 	al_pcie->ecam_size = resource_size(ecam_res);
+	pci->pp.native_ecam = true;
 
 	controller_res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 						      "controller");

drivers/pci/controller/dwc/pcie-amd-mdb.c

···
 #include <linux/resource.h>
 #include <linux/types.h>
 
+#include "../../pci.h"
 #include "pcie-designware.h"
 
 #define AMD_MDB_TLP_IR_STATUS_MISC		0x4C0
···
  * @slcr: MDB System Level Control and Status Register (SLCR) base
  * @intx_domain: INTx IRQ domain pointer
  * @mdb_domain: MDB IRQ domain pointer
+ * @perst_gpio: GPIO descriptor for PERST# signal handling
  * @intx_irq: INTx IRQ interrupt number
  */
 struct amd_mdb_pcie {
···
 	void __iomem			*slcr;
 	struct irq_domain		*intx_domain;
 	struct irq_domain		*mdb_domain;
+	struct gpio_desc		*perst_gpio;
 	int				intx_irq;
 };
 
···
 	struct device_node *pcie_intc_node;
 	int err;
 
-	pcie_intc_node = of_get_next_child(node, NULL);
+	pcie_intc_node = of_get_child_by_name(node, "interrupt-controller");
 	if (!pcie_intc_node) {
 		dev_err(dev, "No PCIe Intc node found\n");
 		return -ENODEV;
···
 	return 0;
 }
 
+static int amd_mdb_parse_pcie_port(struct amd_mdb_pcie *pcie)
+{
+	struct device *dev = pcie->pci.dev;
+	struct device_node *pcie_port_node __maybe_unused;
+
+	/*
+	 * This platform currently supports only one Root Port, so the loop
+	 * will execute only once.
+	 * TODO: Enhance the driver to handle multiple Root Ports in the future.
+	 */
+	for_each_child_of_node_with_prefix(dev->of_node, pcie_port_node, "pcie") {
+		pcie->perst_gpio = devm_fwnode_gpiod_get(dev, of_fwnode_handle(pcie_port_node),
+							 "reset", GPIOD_OUT_HIGH, NULL);
+		if (IS_ERR(pcie->perst_gpio))
+			return dev_err_probe(dev, PTR_ERR(pcie->perst_gpio),
+					     "Failed to request reset GPIO\n");
+		return 0;
+	}
+
+	return -ENODEV;
+}
+
 static int amd_mdb_add_pcie_port(struct amd_mdb_pcie *pcie,
 				 struct platform_device *pdev)
 {
···
 
 	pp->ops = &amd_mdb_pcie_host_ops;
 
+	if (pcie->perst_gpio) {
+		mdelay(PCIE_T_PVPERL_MS);
+		gpiod_set_value_cansleep(pcie->perst_gpio, 0);
+		mdelay(PCIE_RESET_CONFIG_WAIT_MS);
+	}
+
 	err = dw_pcie_host_init(pp);
 	if (err) {
 		dev_err(dev, "Failed to initialize host, err=%d\n", err);
···
 	struct device *dev = &pdev->dev;
 	struct amd_mdb_pcie *pcie;
 	struct dw_pcie *pci;
+	int ret;
 
 	pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
 	if (!pcie)
···
 	pci->dev = dev;
 
 	platform_set_drvdata(pdev, pcie);
+
+	ret = amd_mdb_parse_pcie_port(pcie);
+	/*
+	 * If amd_mdb_parse_pcie_port returns -ENODEV, it indicates that the
+	 * PCIe Bridge node was not found in the device tree. This is not
+	 * considered a fatal error and will trigger a fallback where the
+	 * reset GPIO is acquired directly from the PCIe Host Bridge node.
+	 */
+	if (ret) {
+		if (ret != -ENODEV)
+			return ret;
+
+		pcie->perst_gpio = devm_gpiod_get_optional(dev, "reset",
+							   GPIOD_OUT_HIGH);
+		if (IS_ERR(pcie->perst_gpio))
+			return dev_err_probe(dev, PTR_ERR(pcie->perst_gpio),
+					     "Failed to request reset GPIO\n");
+	}
 
 	return amd_mdb_add_pcie_port(pcie, pdev);
 }

drivers/pci/controller/dwc/pcie-artpec6.c

···
 }
 
 static const struct pci_epc_features artpec6_pcie_epc_features = {
-	.linkup_notifier = false,
 	.msi_capable = true,
-	.msix_capable = false,
 };
 
 static const struct pci_epc_features *

drivers/pci/controller/dwc/pcie-designware-ep.c

···
 }
 EXPORT_SYMBOL_GPL(dw_pcie_ep_reset_bar);
 
-static u8 __dw_pcie_ep_find_next_cap(struct dw_pcie_ep *ep, u8 func_no,
-				     u8 cap_ptr, u8 cap)
-{
-	u8 cap_id, next_cap_ptr;
-	u16 reg;
-
-	if (!cap_ptr)
-		return 0;
-
-	reg = dw_pcie_ep_readw_dbi(ep, func_no, cap_ptr);
-	cap_id = (reg & 0x00ff);
-
-	if (cap_id > PCI_CAP_ID_MAX)
-		return 0;
-
-	if (cap_id == cap)
-		return cap_ptr;
-
-	next_cap_ptr = (reg & 0xff00) >> 8;
-	return __dw_pcie_ep_find_next_cap(ep, func_no, next_cap_ptr, cap);
-}
-
 static u8 dw_pcie_ep_find_capability(struct dw_pcie_ep *ep, u8 func_no, u8 cap)
 {
-	u8 next_cap_ptr;
-	u16 reg;
-
-	reg = dw_pcie_ep_readw_dbi(ep, func_no, PCI_CAPABILITY_LIST);
-	next_cap_ptr = (reg & 0x00ff);
-
-	return __dw_pcie_ep_find_next_cap(ep, func_no, next_cap_ptr, cap);
+	return PCI_FIND_NEXT_CAP(dw_pcie_ep_read_cfg, PCI_CAPABILITY_LIST,
+				 cap, ep, func_no);
 }
 
 /**

drivers/pci/controller/dwc/pcie-designware-host.c

···
  * Author: Jingoo Han <[e-mail]>
  */
 
+#include <linux/align.h>
 #include <linux/iopoll.h>
 #include <linux/irqchip/chained_irq.h>
 #include <linux/irqchip/irq-msi-lib.h>
···
 #define DW_PCIE_MSI_FLAGS_SUPPORTED (MSI_FLAG_MULTI_PCI_MSI		| \
 				     MSI_FLAG_PCI_MSIX			| \
 				     MSI_GENERIC_FLAGS_MASK)
+
+#define IS_256MB_ALIGNED(x) IS_ALIGNED(x, SZ_256M)
 
 static const struct msi_parent_ops dw_pcie_msi_parent_ops = {
 	.required_flags		= DW_PCIE_MSI_FLAGS_REQUIRED,
···
 	}
 }
 
+static int dw_pcie_config_ecam_iatu(struct dw_pcie_rp *pp)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+	struct dw_pcie_ob_atu_cfg atu = {0};
+	resource_size_t bus_range_max;
+	struct resource_entry *bus;
+	int ret;
+
+	bus = resource_list_first_type(&pp->bridge->windows, IORESOURCE_BUS);
+
+	/*
+	 * Root bus under the host bridge doesn't require any iATU configuration
+	 * as DBI region will be used to access root bus config space.
+	 * Immediate bus under Root Bus, needs type 0 iATU configuration and
+	 * remaining buses need type 1 iATU configuration.
+	 */
+	atu.index = 0;
+	atu.type = PCIE_ATU_TYPE_CFG0;
+	atu.parent_bus_addr = pp->cfg0_base + SZ_1M;
+	/* 1MiB is to cover 1 (bus) * 32 (devices) * 8 (functions) */
+	atu.size = SZ_1M;
+	atu.ctrl2 = PCIE_ATU_CFG_SHIFT_MODE_ENABLE;
+	ret = dw_pcie_prog_outbound_atu(pci, &atu);
+	if (ret)
+		return ret;
+
+	bus_range_max = resource_size(bus->res);
+
+	if (bus_range_max < 2)
+		return 0;
+
+	/* Configure remaining buses in type 1 iATU configuration */
+	atu.index = 1;
+	atu.type = PCIE_ATU_TYPE_CFG1;
+	atu.parent_bus_addr = pp->cfg0_base + SZ_2M;
+	atu.size = (SZ_1M * bus_range_max) - SZ_2M;
+	atu.ctrl2 = PCIE_ATU_CFG_SHIFT_MODE_ENABLE;
+
+	return dw_pcie_prog_outbound_atu(pci, &atu);
+}
+
+static int dw_pcie_create_ecam_window(struct dw_pcie_rp *pp, struct resource *res)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+	struct device *dev = pci->dev;
+	struct resource_entry *bus;
+
+	bus = resource_list_first_type(&pp->bridge->windows, IORESOURCE_BUS);
+	if (!bus)
+		return -ENODEV;
+
+	pp->cfg = pci_ecam_create(dev, res, bus->res, &pci_generic_ecam_ops);
+	if (IS_ERR(pp->cfg))
+		return PTR_ERR(pp->cfg);
+
+	pci->dbi_base = pp->cfg->win;
+	pci->dbi_phys_addr = res->start;
+
+	return 0;
+}
+
+static bool dw_pcie_ecam_enabled(struct dw_pcie_rp *pp, struct resource *config_res)
+{
+	struct resource *bus_range;
+	u64 nr_buses;
+
+	/* Vendor glue drivers may implement their own ECAM mechanism */
+	if (pp->native_ecam)
+		return false;
+
+	/*
+	 * PCIe spec r6.0, sec 7.2.2 mandates the base address used for ECAM to
+	 * be aligned on a 2^(n+20) byte boundary, where n is the number of bits
+	 * used for representing 'bus' in BDF. Since the DWC cores always use 8
+	 * bits for representing 'bus', the base address has to be aligned to
+	 * 2^28 byte boundary, which is 256 MiB.
+	 */
+	if (!IS_256MB_ALIGNED(config_res->start))
+		return false;
+
+	bus_range = resource_list_first_type(&pp->bridge->windows, IORESOURCE_BUS)->res;
+	if (!bus_range)
+		return false;
+
+	nr_buses = resource_size(config_res) >> PCIE_ECAM_BUS_SHIFT;
+
+	return nr_buses >= resource_size(bus_range);
+}
+
 static int dw_pcie_host_get_resources(struct dw_pcie_rp *pp)
 {
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
···
 	struct resource_entry *win;
 	struct resource *res;
 	int ret;
-
-	ret = dw_pcie_get_resources(pci);
-	if (ret)
-		return ret;
 
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config");
 	if (!res) {
···
 	pp->cfg0_size = resource_size(res);
 	pp->cfg0_base = res->start;
 
-	pp->va_cfg0_base = devm_pci_remap_cfg_resource(dev, res);
-	if (IS_ERR(pp->va_cfg0_base))
-		return PTR_ERR(pp->va_cfg0_base);
+	pp->ecam_enabled = dw_pcie_ecam_enabled(pp, res);
+	if (pp->ecam_enabled) {
+		ret = dw_pcie_create_ecam_window(pp, res);
+		if (ret)
+			return ret;
+
+		pp->bridge->ops = (struct pci_ops *)&pci_generic_ecam_ops.pci_ops;
+		pp->bridge->sysdata = pp->cfg;
+		pp->cfg->priv = pp;
+	} else {
+		pp->va_cfg0_base = devm_pci_remap_cfg_resource(dev, res);
+		if (IS_ERR(pp->va_cfg0_base))
+			return PTR_ERR(pp->va_cfg0_base);
+
+		/* Set default bus ops */
+		pp->bridge->ops = &dw_pcie_ops;
+		pp->bridge->child_ops = &dw_child_pcie_ops;
+		pp->bridge->sysdata = pp;
+	}
+
+	ret = dw_pcie_get_resources(pci);
+	if (ret) {
+		if (pp->cfg)
+			pci_ecam_free(pp->cfg);
+		return ret;
+	}
 
 	/* Get the I/O range from DT */
 	win = resource_list_first_type(&pp->bridge->windows, IORESOURCE_IO);
···
 	if (ret)
 		return ret;
 
-	/* Set default bus ops */
-	bridge->ops = &dw_pcie_ops;
-	bridge->child_ops = &dw_child_pcie_ops;
-
 	if (pp->ops->init) {
 		ret = pp->ops->init(pp);
 		if (ret)
-			return ret;
+			goto err_free_ecam;
 	}
 
 	if (pci_msi_enabled()) {
···
 	if (ret)
 		goto err_free_msi;
 
+	if (pp->ecam_enabled) {
+		ret = dw_pcie_config_ecam_iatu(pp);
+		if (ret) {
+			dev_err(dev, "Failed to configure iATU in ECAM mode\n");
+			goto err_free_msi;
+		}
+	}
+
 	/*
 	 * Allocate the resource for MSG TLP before programming the iATU
 	 * outbound window in dw_pcie_setup_rc(). Since the allocation depends
···
 		/* Ignore errors, the link may come up later */
 		dw_pcie_wait_for_link(pci);
 
-	bridge->sysdata = pp;
-
 	ret = pci_host_probe(bridge);
 	if (ret)
 		goto err_stop_link;
···
 	if (pp->ops->deinit)
 		pp->ops->deinit(pp);
 
+err_free_ecam:
+	if (pp->cfg)
+		pci_ecam_free(pp->cfg);
+
 	return ret;
 }
 EXPORT_SYMBOL_GPL(dw_pcie_host_init);
···
 
 	if (pp->ops->deinit)
 		pp->ops->deinit(pp);
+
+	if (pp->cfg)
+		pci_ecam_free(pp->cfg);
 }
 EXPORT_SYMBOL_GPL(dw_pcie_host_deinit);
 

drivers/pci/controller/dwc/pcie-designware-plat.c

···
 }
 
 static const struct pci_epc_features dw_plat_pcie_epc_features = {
-	.linkup_notifier = false,
 	.msi_capable = true,
 	.msix_capable = true,
 };

drivers/pci/controller/dwc/pcie-designware.c

···
 		}
 	}
 
+	/* ELBI is an optional resource */
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "elbi");
+	if (res) {
+		pci->elbi_base = devm_ioremap_resource(pci->dev, res);
+		if (IS_ERR(pci->elbi_base))
+			return PTR_ERR(pci->elbi_base);
+	}
+
 	/* LLDD is supposed to manually switch the clocks and resets state */
 	if (dw_pcie_cap_is(pci, REQ_RES)) {
 		ret = dw_pcie_get_clocks(pci);
···
 		pci->type = ver;
 }
 
-/*
- * These interfaces resemble the pci_find_*capability() interfaces, but these
- * are for configuring host controllers, which are bridges *to* PCI devices but
- * are not PCI devices themselves.
- */
-static u8 __dw_pcie_find_next_cap(struct dw_pcie *pci, u8 cap_ptr,
-				  u8 cap)
-{
-	u8 cap_id, next_cap_ptr;
-	u16 reg;
-
-	if (!cap_ptr)
-		return 0;
-
-	reg = dw_pcie_readw_dbi(pci, cap_ptr);
-	cap_id = (reg & 0x00ff);
-
-	if (cap_id > PCI_CAP_ID_MAX)
-		return 0;
-
-	if (cap_id == cap)
-		return cap_ptr;
-
-	next_cap_ptr = (reg & 0xff00) >> 8;
-	return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap);
-}
-
 u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap)
 {
-	u8 next_cap_ptr;
-	u16 reg;
-
-	reg = dw_pcie_readw_dbi(pci, PCI_CAPABILITY_LIST);
-	next_cap_ptr = (reg & 0x00ff);
-
-	return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap);
+	return PCI_FIND_NEXT_CAP(dw_pcie_read_cfg, PCI_CAPABILITY_LIST, cap,
+				 pci);
 }
 EXPORT_SYMBOL_GPL(dw_pcie_find_capability);
 
-static u16 dw_pcie_find_next_ext_capability(struct dw_pcie *pci, u16 start,
-					    u8 cap)
-{
-	u32 header;
-	int ttl;
-	int pos = PCI_CFG_SPACE_SIZE;
-
-	/* minimum 8 bytes per capability */
-	ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8;
-
-	if (start)
-		pos = start;
-
-	header = dw_pcie_readl_dbi(pci, pos);
-	/*
-	 * If we have no capabilities, this is indicated by cap ID,
-	 * cap version and next pointer all being 0.
-	 */
-	if (header == 0)
-		return 0;
-
-	while (ttl-- > 0) {
-		if (PCI_EXT_CAP_ID(header) == cap && pos != start)
-			return pos;
-
-		pos = PCI_EXT_CAP_NEXT(header);
-		if (pos < PCI_CFG_SPACE_SIZE)
-			break;
-
-		header = dw_pcie_readl_dbi(pci, pos);
-	}
-
-	return 0;
-}
-
 u16 dw_pcie_find_ext_capability(struct dw_pcie *pci, u8 cap)
 {
-	return dw_pcie_find_next_ext_capability(pci, 0, cap);
+	return PCI_FIND_NEXT_EXT_CAP(dw_pcie_read_cfg, 0, cap, pci);
 }
 EXPORT_SYMBOL_GPL(dw_pcie_find_ext_capability);
 
···
 	if (vendor_id != dw_pcie_readw_dbi(pci, PCI_VENDOR_ID))
 		return 0;
 
-	while ((vsec = dw_pcie_find_next_ext_capability(pci, vsec,
-						       PCI_EXT_CAP_ID_VNDR))) {
+	while ((vsec = PCI_FIND_NEXT_EXT_CAP(dw_pcie_read_cfg, vsec,
+					     PCI_EXT_CAP_ID_VNDR, pci))) {
 		header = dw_pcie_readl_dbi(pci, vsec + PCI_VNDR_HEADER);
 		if (PCI_VNDR_HEADER_ID(header) == vsec_id)
 			return vsec;
···
 		val = dw_pcie_enable_ecrc(val);
 	dw_pcie_writel_atu_ob(pci, atu->index, PCIE_ATU_REGION_CTRL1, val);
 
-	val = PCIE_ATU_ENABLE;
+	val = PCIE_ATU_ENABLE | atu->ctrl2;
 	if (atu->type == PCIE_ATU_TYPE_MSG) {
 		/* The data-less messages only for now */
 		val |= PCIE_ATU_INHIBIT_PAYLOAD | atu->code;
···
 	case 8:
 		plc |= PORT_LINK_MODE_8_LANES;
 		break;
+	case 16:
+		plc |= PORT_LINK_MODE_16_LANES;
+		break;
 	default:
 		dev_err(pci->dev, "num-lanes %u: invalid value\n", num_lanes);
 		return;
···
 	char name[15];
 	int ret;
 
-	if (pci->edma.nr_irqs == 1)
-		return 0;
-	else if (pci->edma.nr_irqs > 1)
+	if (pci->edma.nr_irqs > 1)
 		return pci->edma.nr_irqs != ch_cnt ? -EINVAL : 0;
 
 	ret = platform_get_irq_byname_optional(pdev, "dma");

drivers/pci/controller/dwc/pcie-designware.h

···
 #include <linux/irq.h>
 #include <linux/msi.h>
 #include <linux/pci.h>
+#include <linux/pci-ecam.h>
 #include <linux/reset.h>
 
 #include <linux/pci-epc.h>
···
 #define PORT_LINK_MODE_2_LANES		PORT_LINK_MODE(0x3)
 #define PORT_LINK_MODE_4_LANES		PORT_LINK_MODE(0x7)
 #define PORT_LINK_MODE_8_LANES		PORT_LINK_MODE(0xf)
+#define PORT_LINK_MODE_16_LANES		PORT_LINK_MODE(0x1f)
 
 #define PCIE_PORT_LANE_SKEW		0x714
 #define PORT_LANE_SKEW_INSERT_MASK	GENMASK(23, 0)
···
 #define GEN3_RELATED_OFF_GEN3_EQ_DISABLE	BIT(16)
 #define GEN3_RELATED_OFF_RATE_SHADOW_SEL_SHIFT	24
 #define GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK	GENMASK(25, 24)
-#define GEN3_RELATED_OFF_RATE_SHADOW_SEL_16_0GT	0x1
 
 #define GEN3_EQ_CONTROL_OFF			0x8A8
 #define GEN3_EQ_CONTROL_OFF_FB_MODE		GENMASK(3, 0)
···
 #define GEN3_EQ_FB_MODE_DIR_CHANGE_OFF		0x8AC
 #define GEN3_EQ_FMDC_T_MIN_PHASE23		GENMASK(4, 0)
 #define GEN3_EQ_FMDC_N_EVALS			GENMASK(9, 5)
-#define GEN3_EQ_FMDC_MAX_PRE_CUSROR_DELTA	GENMASK(13, 10)
-#define GEN3_EQ_FMDC_MAX_POST_CUSROR_DELTA	GENMASK(17, 14)
+#define GEN3_EQ_FMDC_MAX_PRE_CURSOR_DELTA	GENMASK(13, 10)
+#define GEN3_EQ_FMDC_MAX_POST_CURSOR_DELTA	GENMASK(17, 14)
 
 #define PCIE_PORT_MULTI_LANE_CTRL	0x8C0
 #define PORT_MLTI_UPCFG_SUPPORT		BIT(7)
···
 #define PCIE_ATU_REGION_CTRL2		0x004
 #define PCIE_ATU_ENABLE			BIT(31)
 #define PCIE_ATU_BAR_MODE_ENABLE	BIT(30)
+#define PCIE_ATU_CFG_SHIFT_MODE_ENABLE	BIT(28)
 #define PCIE_ATU_INHIBIT_PAYLOAD	BIT(22)
 #define PCIE_ATU_FUNC_NUM_MATCH_EN      BIT(19)
 #define PCIE_ATU_LOWER_BASE		0x008
···
 	u8 func_no;
 	u8 code;
 	u8 routing;
+	u32 ctrl2;
 	u64 parent_bus_addr;
 	u64 pci_addr;
 	u64 size;
···
 	struct resource		*msg_res;
 	bool			use_linkup_irq;
 	struct pci_eq_presets	presets;
+	struct pci_config_window *cfg;
+	bool			ecam_enabled;
+	bool			native_ecam;
 };
 
 struct dw_pcie_ep_ops {
···
 	resource_size_t		dbi_phys_addr;
 	void __iomem		*dbi_base2;
 	void __iomem		*atu_base;
+	void __iomem		*elbi_base;
 	resource_size_t		atu_phys_addr;
 	size_t			atu_size;
 	resource_size_t		parent_bus_offset;
···
 	dw_pcie_write_dbi2(pci, reg, 0x4, val);
 }
 
+static inline int dw_pcie_read_cfg_byte(struct dw_pcie *pci, int where,
+					u8 *val)
+{
+	*val = dw_pcie_readb_dbi(pci, where);
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static inline int dw_pcie_read_cfg_word(struct dw_pcie *pci, int where,
+					u16 *val)
+{
+	*val = dw_pcie_readw_dbi(pci, where);
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static inline int dw_pcie_read_cfg_dword(struct dw_pcie *pci, int where,
+					 u32 *val)
+{
+	*val = dw_pcie_readl_dbi(pci, where);
+	return PCIBIOS_SUCCESSFUL;
+}
+
 static inline unsigned int dw_pcie_ep_get_dbi_offset(struct dw_pcie_ep *ep,
 						     u8 func_no)
 {
···
 				      u32 reg)
 {
 	return dw_pcie_ep_read_dbi(ep, func_no, reg, 0x1);
+}
+
+static inline int dw_pcie_ep_read_cfg_byte(struct dw_pcie_ep *ep, u8 func_no,
+					   int where, u8 *val)
+{
+	*val = dw_pcie_ep_readb_dbi(ep, func_no, where);
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static inline int dw_pcie_ep_read_cfg_word(struct dw_pcie_ep *ep, u8 func_no,
+					   int where, u16 *val)
+{
+	*val = dw_pcie_ep_readw_dbi(ep, func_no, where);
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static inline int dw_pcie_ep_read_cfg_dword(struct dw_pcie_ep *ep, u8 func_no,
+					    int where, u32 *val)
+{
+	*val = dw_pcie_ep_readl_dbi(ep, func_no, where);
+	return PCIBIOS_SUCCESSFUL;
 }
 
 static inline unsigned int dw_pcie_ep_get_dbi2_offset(struct dw_pcie_ep *ep,

drivers/pci/controller/dwc/pcie-dw-rockchip.c

···
 	.linkup_notifier = true,
 	.msi_capable = true,
 	.msix_capable = true,
-	.intx_capable = false,
 	.align = SZ_64K,
 	.bar[BAR_0] = { .type = BAR_RESIZABLE, },
 	.bar[BAR_1] = { .type = BAR_RESIZABLE, },
···
 	.linkup_notifier = true,
 	.msi_capable = true,
 	.msix_capable = true,
-	.intx_capable = false,
 	.align = SZ_64K,
 	.bar[BAR_0] = { .type = BAR_RESIZABLE, },
 	.bar[BAR_1] = { .type = BAR_RESIZABLE, },

drivers/pci/controller/dwc/pcie-keembay.c

···
 }
 
 static const struct pci_epc_features keembay_pcie_epc_features = {
-	.linkup_notifier	= false,
 	.msi_capable		= true,
 	.msix_capable		= true,
 	.bar[BAR_0]		= { .only_64bit = true, },

drivers/pci/controller/dwc/pcie-qcom-common.c

···
 #include "pcie-designware.h"
 #include "pcie-qcom-common.h"
 
-void qcom_pcie_common_set_16gt_equalization(struct dw_pcie *pci)
+void qcom_pcie_common_set_equalization(struct dw_pcie *pci)
 {
+	struct device *dev = pci->dev;
 	u32 reg;
+	u16 speed;
 
 	/*
 	 * GEN3_RELATED_OFF register is repurposed to apply equalization
···
 	 * determines the data rate for which these equalization settings are
 	 * applied.
 	 */
-	reg = dw_pcie_readl_dbi(pci, GEN3_RELATED_OFF);
-	reg &= ~GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL;
-	reg &= ~GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK;
-	reg |= FIELD_PREP(GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK,
-			  GEN3_RELATED_OFF_RATE_SHADOW_SEL_16_0GT);
-	dw_pcie_writel_dbi(pci, GEN3_RELATED_OFF, reg);
 
-	reg = dw_pcie_readl_dbi(pci, GEN3_EQ_FB_MODE_DIR_CHANGE_OFF);
-	reg &= ~(GEN3_EQ_FMDC_T_MIN_PHASE23 |
-		GEN3_EQ_FMDC_N_EVALS |
-		GEN3_EQ_FMDC_MAX_PRE_CUSROR_DELTA |
-		GEN3_EQ_FMDC_MAX_POST_CUSROR_DELTA);
-	reg |= FIELD_PREP(GEN3_EQ_FMDC_T_MIN_PHASE23, 0x1) |
-		FIELD_PREP(GEN3_EQ_FMDC_N_EVALS, 0xd) |
-		FIELD_PREP(GEN3_EQ_FMDC_MAX_PRE_CUSROR_DELTA, 0x5) |
-		FIELD_PREP(GEN3_EQ_FMDC_MAX_POST_CUSROR_DELTA, 0x5);
-	dw_pcie_writel_dbi(pci, GEN3_EQ_FB_MODE_DIR_CHANGE_OFF, reg);
+	for (speed = PCIE_SPEED_8_0GT; speed <= pcie_link_speed[pci->max_link_speed]; speed++) {
+		if (speed > PCIE_SPEED_32_0GT) {
+			dev_warn(dev, "Skipped equalization settings for unsupported data rate\n");
+			break;
+		}
 
-	reg = dw_pcie_readl_dbi(pci, GEN3_EQ_CONTROL_OFF);
-	reg &= ~(GEN3_EQ_CONTROL_OFF_FB_MODE |
-		GEN3_EQ_CONTROL_OFF_PHASE23_EXIT_MODE |
-		GEN3_EQ_CONTROL_OFF_FOM_INC_INITIAL_EVAL |
-		GEN3_EQ_CONTROL_OFF_PSET_REQ_VEC);
-	dw_pcie_writel_dbi(pci, GEN3_EQ_CONTROL_OFF, reg);
+		reg = dw_pcie_readl_dbi(pci, GEN3_RELATED_OFF);
+		reg &= ~GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL;
+		reg &= ~GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK;
+		reg |= FIELD_PREP(GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK,
+			  speed - PCIE_SPEED_8_0GT);
+		dw_pcie_writel_dbi(pci, GEN3_RELATED_OFF, reg);
+
+		reg = dw_pcie_readl_dbi(pci, GEN3_EQ_FB_MODE_DIR_CHANGE_OFF);
+		reg &= ~(GEN3_EQ_FMDC_T_MIN_PHASE23 |
+			GEN3_EQ_FMDC_N_EVALS |
+			GEN3_EQ_FMDC_MAX_PRE_CURSOR_DELTA |
+			GEN3_EQ_FMDC_MAX_POST_CURSOR_DELTA);
+		reg |= FIELD_PREP(GEN3_EQ_FMDC_T_MIN_PHASE23, 0x1) |
+			FIELD_PREP(GEN3_EQ_FMDC_N_EVALS, 0xd) |
+			FIELD_PREP(GEN3_EQ_FMDC_MAX_PRE_CURSOR_DELTA, 0x5) |
+			FIELD_PREP(GEN3_EQ_FMDC_MAX_POST_CURSOR_DELTA, 0x5);
+		dw_pcie_writel_dbi(pci, GEN3_EQ_FB_MODE_DIR_CHANGE_OFF, reg);
+
+		reg = dw_pcie_readl_dbi(pci, GEN3_EQ_CONTROL_OFF);
+		reg &= ~(GEN3_EQ_CONTROL_OFF_FB_MODE |
+			GEN3_EQ_CONTROL_OFF_PHASE23_EXIT_MODE |
+			GEN3_EQ_CONTROL_OFF_FOM_INC_INITIAL_EVAL |
+			GEN3_EQ_CONTROL_OFF_PSET_REQ_VEC);
+		dw_pcie_writel_dbi(pci, GEN3_EQ_CONTROL_OFF, reg);
+	}
 }
-EXPORT_SYMBOL_GPL(qcom_pcie_common_set_16gt_equalization);
+EXPORT_SYMBOL_GPL(qcom_pcie_common_set_equalization);
 
 void qcom_pcie_common_set_16gt_lane_margining(struct dw_pcie *pci)
 {

drivers/pci/controller/dwc/pcie-qcom-common.h

···
 
 struct dw_pcie;
 
-void qcom_pcie_common_set_16gt_equalization(struct dw_pcie *pci);
+void qcom_pcie_common_set_equalization(struct dw_pcie *pci);
 void qcom_pcie_common_set_16gt_lane_margining(struct dw_pcie *pci);
 
 #endif

drivers/pci/controller/dwc/pcie-qcom-ep.c

···
  * struct qcom_pcie_ep - Qualcomm PCIe Endpoint Controller
  * @pci: Designware PCIe controller struct
  * @parf: Qualcomm PCIe specific PARF register base
- * @elbi: Designware PCIe specific ELBI register base
  * @mmio: MMIO register base
  * @perst_map: PERST regmap
  * @mmio_res: MMIO region resource
···
 	struct dw_pcie pci;
 
 	void __iomem *parf;
-	void __iomem *elbi;
 	void __iomem *mmio;
 	struct regmap *perst_map;
 	struct resource *mmio_res;
···
 
 static bool qcom_pcie_dw_link_up(struct dw_pcie *pci)
 {
-	struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci);
 	u32 reg;
 
-	reg = readl_relaxed(pcie_ep->elbi + ELBI_SYS_STTS);
+	reg = readl_relaxed(pci->elbi_base + ELBI_SYS_STTS);
 
 	return reg & XMLH_LINK_UP;
 }
···
 static void qcom_pcie_dw_write_dbi2(struct dw_pcie *pci, void __iomem *base,
 				    u32 reg, size_t size, u32 val)
 {
-	struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci);
 	int ret;
 
-	writel(1, pcie_ep->elbi + ELBI_CS2_ENABLE);
+	writel(1, pci->elbi_base + ELBI_CS2_ENABLE);
 
 	ret = dw_pcie_write(pci->dbi_base2 + reg, size, val);
 	if (ret)
 		dev_err(pci->dev, "Failed to write DBI2 register (0x%x): %d\n", reg, ret);
 
-	writel(0, pcie_ep->elbi + ELBI_CS2_ENABLE);
+	writel(0, pci->elbi_base + ELBI_CS2_ENABLE);
 }
 
 static void qcom_pcie_ep_icc_update(struct qcom_pcie_ep *pcie_ep)
···
 		goto err_disable_resources;
 	}
 
-	if (pcie_link_speed[pci->max_link_speed] == PCIE_SPEED_16_0GT) {
-		qcom_pcie_common_set_16gt_equalization(pci);
+	qcom_pcie_common_set_equalization(pci);
+
+	if (pcie_link_speed[pci->max_link_speed] == PCIE_SPEED_16_0GT)
 		qcom_pcie_common_set_16gt_lane_margining(pci);
-	}
 
 	/*
 	 * The physical address of the MMIO region which is exposed as the BAR
···
 	if (IS_ERR(pci->dbi_base))
 		return PTR_ERR(pci->dbi_base);
 	pci->dbi_base2 = pci->dbi_base;
-
-	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "elbi");
-	pcie_ep->elbi = devm_pci_remap_cfg_resource(dev, res);
-	if (IS_ERR(pcie_ep->elbi))
-		return PTR_ERR(pcie_ep->elbi);
 
 	pcie_ep->mmio_res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 							 "mmio");
···
 static const struct pci_epc_features qcom_pcie_epc_features = {
 	.linkup_notifier = true,
 	.msi_capable = true,
-	.msix_capable = false,
 	.align = SZ_4K,
 	.bar[BAR_0] = { .only_64bit = true, },
 	.bar[BAR_1] = { .type = BAR_RESERVED, },
···
 	pcie_ep->pci.dev = dev;
 	pcie_ep->pci.ops = &pci_ops;
 	pcie_ep->pci.ep.ops = &pci_ep_ops;
-	pcie_ep->pci.edma.nr_irqs = 1;
 
 	pcie_ep->cfg = of_device_get_match_data(dev);
 	if (pcie_ep->cfg && pcie_ep->cfg->hdma_support) {

drivers/pci/controller/dwc/pcie-qcom.c

···
 #define PARF_AXI_MSTR_WR_ADDR_HALT_V2		0x1a8
 #define PARF_Q2A_FLUSH				0x1ac
 #define PARF_LTSSM				0x1b0
+#define PARF_SLV_DBI_ELBI			0x1b4
 #define PARF_INT_ALL_STATUS			0x224
 #define PARF_INT_ALL_CLEAR			0x228
 #define PARF_INT_ALL_MASK			0x22c
···
 #define PARF_DBI_BASE_ADDR_V2_HI		0x354
 #define PARF_SLV_ADDR_SPACE_SIZE_V2		0x358
 #define PARF_SLV_ADDR_SPACE_SIZE_V2_HI		0x35c
+#define PARF_BLOCK_SLV_AXI_WR_BASE		0x360
+#define PARF_BLOCK_SLV_AXI_WR_BASE_HI		0x364
+#define PARF_BLOCK_SLV_AXI_WR_LIMIT		0x368
+#define PARF_BLOCK_SLV_AXI_WR_LIMIT_HI		0x36c
+#define PARF_BLOCK_SLV_AXI_RD_BASE		0x370
+#define PARF_BLOCK_SLV_AXI_RD_BASE_HI		0x374
+#define PARF_BLOCK_SLV_AXI_RD_LIMIT		0x378
+#define PARF_BLOCK_SLV_AXI_RD_LIMIT_HI		0x37c
+#define PARF_ECAM_BASE				0x380
+#define PARF_ECAM_BASE_HI			0x384
 #define PARF_NO_SNOOP_OVERRIDE			0x3d4
 #define PARF_ATU_BASE_ADDR			0x634
 #define PARF_ATU_BASE_ADDR_HI			0x638
···
 
 /* PARF_SYS_CTRL register fields */
 #define MAC_PHY_POWERDOWN_IN_P2_D_MUX_EN	BIT(29)
+#define PCIE_ECAM_BLOCKER_EN			BIT(26)
 #define MST_WAKEUP_EN				BIT(13)
 #define SLV_WAKEUP_EN				BIT(12)
 #define MSTR_ACLK_CGC_DIS			BIT(10)
···
 
 /* PARF_LTSSM register fields */
 #define LTSSM_EN				BIT(8)
+
+/* PARF_SLV_DBI_ELBI */
+#define SLV_DBI_ELBI_ADDR_BASE			GENMASK(11, 0)
 
 /* PARF_INT_ALL_{STATUS/CLEAR/MASK} register fields */
 #define PARF_INT_ALL_LINK_UP			BIT(13)
···
 	int (*get_resources)(struct qcom_pcie *pcie);
 	int (*init)(struct qcom_pcie *pcie);
 	int (*post_init)(struct qcom_pcie *pcie);
-	void (*host_post_init)(struct qcom_pcie *pcie);
 	void (*deinit)(struct qcom_pcie *pcie);
 	void (*ltssm_enable)(struct qcom_pcie *pcie);
 	int (*config_sid)(struct qcom_pcie *pcie);
···
 struct qcom_pcie {
 	struct dw_pcie *pci;
 	void __iomem *parf;			/* DT parf */
-	void __iomem *elbi;			/* DT elbi */
 	void __iomem *mhi;
 	union qcom_pcie_resources res;
-	struct phy *phy;
-	struct gpio_desc *reset;
 	struct icc_path *icc_mem;
 	struct icc_path *icc_cpu;
 	const struct qcom_pcie_cfg *cfg;
···
 	struct qcom_pcie_port *port;
 	int val = assert ? 1 : 0;
 
-	if (list_empty(&pcie->ports))
-		gpiod_set_value_cansleep(pcie->reset, val);
-	else
-		list_for_each_entry(port, &pcie->ports, list)
-			gpiod_set_value_cansleep(port->reset, val);
+	list_for_each_entry(port, &pcie->ports, list)
+		gpiod_set_value_cansleep(port->reset, val);
 
 	usleep_range(PERST_DELAY_US, PERST_DELAY_US + 500);
 }
···
 	qcom_perst_assert(pcie, false);
 }
 
+static void qcom_pci_config_ecam(struct dw_pcie_rp *pp)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+	struct qcom_pcie *pcie = to_qcom_pcie(pci);
+	u64 addr, addr_end;
+	u32 val;
+
+	writel_relaxed(lower_32_bits(pci->dbi_phys_addr), pcie->parf + PARF_ECAM_BASE);
+	writel_relaxed(upper_32_bits(pci->dbi_phys_addr), pcie->parf + PARF_ECAM_BASE_HI);
+
+	/*
+	 * The only device on the root bus is a single Root Port. If we try to
+	 * access any devices other than Device/Function 00.0 on Bus 0, the TLP
+	 * will go outside of the controller to the PCI bus. But with CFG Shift
+	 * Feature (ECAM) enabled in iATU, there is no guarantee that the
+	 * response is going to be all F's. Hence, to make sure that the
+	 * requester gets all F's response for accesses other than the Root
+	 * Port, configure iATU to block the transactions starting from
+	 * function 1 of the root bus to the end of the root bus (i.e., from
+	 * dbi_base + 4KB to dbi_base + 1MB).
+	 */
+	addr = pci->dbi_phys_addr + SZ_4K;
+	writel_relaxed(lower_32_bits(addr), pcie->parf + PARF_BLOCK_SLV_AXI_WR_BASE);
+	writel_relaxed(upper_32_bits(addr), pcie->parf + PARF_BLOCK_SLV_AXI_WR_BASE_HI);
+
+	writel_relaxed(lower_32_bits(addr), pcie->parf + PARF_BLOCK_SLV_AXI_RD_BASE);
+	writel_relaxed(upper_32_bits(addr), pcie->parf + PARF_BLOCK_SLV_AXI_RD_BASE_HI);
+
+	addr_end = pci->dbi_phys_addr + SZ_1M - 1;
+
+	writel_relaxed(lower_32_bits(addr_end), pcie->parf + PARF_BLOCK_SLV_AXI_WR_LIMIT);
+	writel_relaxed(upper_32_bits(addr_end), pcie->parf + PARF_BLOCK_SLV_AXI_WR_LIMIT_HI);
+
+	writel_relaxed(lower_32_bits(addr_end), pcie->parf + PARF_BLOCK_SLV_AXI_RD_LIMIT);
+	writel_relaxed(upper_32_bits(addr_end), pcie->parf + PARF_BLOCK_SLV_AXI_RD_LIMIT_HI);
+
+	val = readl_relaxed(pcie->parf + PARF_SYS_CTRL);
+	val |= PCIE_ECAM_BLOCKER_EN;
+	writel_relaxed(val, pcie->parf + PARF_SYS_CTRL);
+}
+
 static int qcom_pcie_start_link(struct dw_pcie *pci)
 {
 	struct qcom_pcie *pcie = to_qcom_pcie(pci);
 
-	if (pcie_link_speed[pci->max_link_speed] == PCIE_SPEED_16_0GT) {
-		qcom_pcie_common_set_16gt_equalization(pci);
+	qcom_pcie_common_set_equalization(pci);
+
+	if (pcie_link_speed[pci->max_link_speed] == PCIE_SPEED_16_0GT)
 		qcom_pcie_common_set_16gt_lane_margining(pci);
-	}
 
 	/* Enable Link Training state machine */
 	if (pcie->cfg->ops->ltssm_enable)
···
 
 static void qcom_pcie_2_1_0_ltssm_enable(struct qcom_pcie *pcie)
 {
+	struct dw_pcie *pci = pcie->pci;
 	u32 val;
 
+	if (!pci->elbi_base) {
+		dev_err(pci->dev, "ELBI is not present\n");
+		return;
+	}
 	/* enable link training */
-	val = readl(pcie->elbi + ELBI_SYS_CTRL);
+	val = readl(pci->elbi_base + ELBI_SYS_CTRL);
 	val |= ELBI_SYS_CTRL_LT_ENABLE;
-	writel(val, pcie->elbi + ELBI_SYS_CTRL);
+	writel(val, pci->elbi_base + ELBI_SYS_CTRL);
 }
 
 static int qcom_pcie_get_resources_2_1_0(struct qcom_pcie *pcie)
···
 	return 0;
 }
 
-static int qcom_pcie_enable_aspm(struct pci_dev *pdev, void *userdata)
-{
-	/*
-	 * Downstream devices need to be in D0 state before enabling PCI PM
-	 * substates.
-	 */
-	pci_set_power_state_locked(pdev, PCI_D0);
-	pci_enable_link_state_locked(pdev, PCIE_LINK_STATE_ALL);
-
-	return 0;
-}
-
-static void qcom_pcie_host_post_init_2_7_0(struct qcom_pcie *pcie)
-{
-	struct dw_pcie_rp *pp = &pcie->pci->pp;
-
-	pci_walk_bus(pp->bridge->bus, qcom_pcie_enable_aspm, NULL);
-}
-
 static void qcom_pcie_deinit_2_7_0(struct qcom_pcie *pcie)
 {
 	struct qcom_pcie_resources_2_7_0 *res = &pcie->res.v2_7_0;
···
 	return val & PCI_EXP_LNKSTA_DLLLA;
 }
 
-static void qcom_pcie_phy_exit(struct qcom_pcie *pcie)
-{
-	struct qcom_pcie_port *port;
-
-	if (list_empty(&pcie->ports))
-		phy_exit(pcie->phy);
-	else
-		list_for_each_entry(port, &pcie->ports, list)
-			phy_exit(port->phy);
-}
-
 static void qcom_pcie_phy_power_off(struct qcom_pcie *pcie)
 {
 	struct qcom_pcie_port *port;
 
-	if (list_empty(&pcie->ports)) {
-		phy_power_off(pcie->phy);
-	} else {
-		list_for_each_entry(port, &pcie->ports, list)
-			phy_power_off(port->phy);
-	}
+	list_for_each_entry(port, &pcie->ports, list)
+		phy_power_off(port->phy);
 }
 
 static int qcom_pcie_phy_power_on(struct qcom_pcie *pcie)
 {
 	struct qcom_pcie_port *port;
-	int ret = 0;
+	int ret;
 
-	if (list_empty(&pcie->ports)) {
-		ret = phy_set_mode_ext(pcie->phy, PHY_MODE_PCIE, PHY_MODE_PCIE_RC);
+	list_for_each_entry(port, &pcie->ports, list) {
+		ret = phy_set_mode_ext(port->phy, PHY_MODE_PCIE, PHY_MODE_PCIE_RC);
 		if (ret)
 			return ret;
 
-		ret = phy_power_on(pcie->phy);
-		if (ret)
+		ret = phy_power_on(port->phy);
+		if (ret) {
+			qcom_pcie_phy_power_off(pcie);
 			return ret;
-	} else {
-		list_for_each_entry(port, &pcie->ports, list) {
-			ret = phy_set_mode_ext(port->phy, PHY_MODE_PCIE, PHY_MODE_PCIE_RC);
-			if (ret)
-				return ret;
-
-			ret = phy_power_on(port->phy);
-			if (ret) {
-				qcom_pcie_phy_power_off(pcie);
-				return ret;
-			}
 		}
 	}
 
-	return ret;
+	return 0;
 }
 
 static int qcom_pcie_host_init(struct dw_pcie_rp *pp)
 {
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
 	struct qcom_pcie *pcie = to_qcom_pcie(pci);
+	u16 offset;
 	int ret;
 
 	qcom_ep_reset_assert(pcie);
···
 	ret = pcie->cfg->ops->init(pcie);
 	if (ret)
 		return ret;
+
+	if (pp->ecam_enabled) {
+		/*
+		 * Override ELBI when ECAM is enabled, as when ECAM is enabled,
+		 * ELBI moves under the 'config' space.
+		 */
+		offset = FIELD_GET(SLV_DBI_ELBI_ADDR_BASE, readl(pcie->parf + PARF_SLV_DBI_ELBI));
+		pci->elbi_base = pci->dbi_base + offset;
+
+		qcom_pci_config_ecam(pp);
+	}
 
 	ret = qcom_pcie_phy_power_on(pcie);
 	if (ret)
···
 	pcie->cfg->ops->deinit(pcie);
 }
 
-static void qcom_pcie_host_post_init(struct dw_pcie_rp *pp)
-{
-	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
-	struct qcom_pcie *pcie = to_qcom_pcie(pci);
-
-	if (pcie->cfg->ops->host_post_init)
-		pcie->cfg->ops->host_post_init(pcie);
-}
-
 static const struct dw_pcie_host_ops qcom_pcie_dw_ops = {
 	.init		= qcom_pcie_host_init,
 	.deinit		= qcom_pcie_host_deinit,
-	.post_init	= qcom_pcie_host_post_init,
 };
 
 /* Qcom IP rev.: 2.1.0	Synopsys IP rev.: 4.01a */
···
 	.get_resources = qcom_pcie_get_resources_2_7_0,
 	.init = qcom_pcie_init_2_7_0,
 	.post_init = qcom_pcie_post_init_2_7_0,
-	.host_post_init = qcom_pcie_host_post_init_2_7_0,
 	.deinit = qcom_pcie_deinit_2_7_0,
 	.ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
 	.config_sid = qcom_pcie_config_sid_1_9_0,
···
 	.get_resources = qcom_pcie_get_resources_2_7_0,
 	.init = qcom_pcie_init_2_7_0,
 	.post_init = qcom_pcie_post_init_2_7_0,
-	.host_post_init = qcom_pcie_host_post_init_2_7_0,
 	.deinit = qcom_pcie_deinit_2_7_0,
 	.ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
 };
···
 	int ret = -ENOENT;
 
 	for_each_available_child_of_node_scoped(dev->of_node, of_port) {
+		if (!of_node_is_type(of_port, "pci"))
+			continue;
 		ret = qcom_pcie_parse_port(pcie, of_port);
 		if (ret)
 			goto err_port_del;
···
 	return ret;
 
 err_port_del:
-	list_for_each_entry_safe(port, tmp, &pcie->ports, list)
+	list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
+		phy_exit(port->phy);
 		list_del(&port->list);
+	}
 
 	return ret;
 }
···
 static int qcom_pcie_parse_legacy_binding(struct qcom_pcie *pcie)
 {
 	struct device *dev = pcie->pci->dev;
+	struct qcom_pcie_port *port;
+	struct gpio_desc *reset;
+	struct phy *phy;
 	int ret;
 
-	pcie->phy = devm_phy_optional_get(dev, "pciephy");
-	if (IS_ERR(pcie->phy))
-		return PTR_ERR(pcie->phy);
+	phy = devm_phy_optional_get(dev, "pciephy");
+	if (IS_ERR(phy))
+		return PTR_ERR(phy);
 
-	pcie->reset = devm_gpiod_get_optional(dev, "perst", GPIOD_OUT_HIGH);
-	if (IS_ERR(pcie->reset))
-		return PTR_ERR(pcie->reset);
+	reset = devm_gpiod_get_optional(dev, "perst", GPIOD_OUT_HIGH);
+	if (IS_ERR(reset))
+		return PTR_ERR(reset);
 
-	ret = phy_init(pcie->phy);
+	ret = phy_init(phy);
 	if (ret)
 		return ret;
+
+	port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
+	if (!port)
+		return -ENOMEM;
+
+	port->reset = reset;
+	port->phy = phy;
+	INIT_LIST_HEAD(&port->list);
+	list_add_tail(&port->list, &pcie->ports);
 
 	return 0;
 }
···
 	pcie->parf = devm_platform_ioremap_resource_byname(pdev, "parf");
 	if (IS_ERR(pcie->parf)) {
 		ret = PTR_ERR(pcie->parf);
-		goto err_pm_runtime_put;
-	}
-
-	pcie->elbi = devm_platform_ioremap_resource_byname(pdev, "elbi");
-	if (IS_ERR(pcie->elbi)) {
-		ret = PTR_ERR(pcie->elbi);
 		goto err_pm_runtime_put;
 	}
 
···
 err_host_deinit:
 	dw_pcie_host_deinit(pp);
 err_phy_exit:
-	qcom_pcie_phy_exit(pcie);
-	list_for_each_entry_safe(port, tmp, &pcie->ports, list)
+	list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
+		phy_exit(port->phy);
 		list_del(&port->list);
+	}
 err_pm_runtime_put:
 	pm_runtime_put(dev);
 	pm_runtime_disable(dev);

drivers/pci/controller/dwc/pcie-rcar-gen4.c

···
 		return ret;
 	}
 
-	if (!reset_control_status(dw->core_rsts[DW_PCIE_PWR_RST].rstc))
+	if (!reset_control_status(dw->core_rsts[DW_PCIE_PWR_RST].rstc)) {
 		reset_control_assert(dw->core_rsts[DW_PCIE_PWR_RST].rstc);
+		/*
+		 * R-Car V4H Reference Manual R19UH0186EJ0130 Rev.1.30 Apr.
+		 * 21, 2025 page 585 Figure 9.3.2 Software Reset flow (B)
+		 * indicates that for peripherals in HSC domain, after
+		 * reset has been asserted by writing a matching reset bit
+		 * into register SRCR, it is mandatory to wait 1ms.
+		 */
+		fsleep(1000);
+	}
 
 	val = readl(rcar->base + PCIEMSR0);
 	if (rcar->drvdata->mode == DW_PCIE_RC_TYPE) {
···
 	ret = reset_control_deassert(dw->core_rsts[DW_PCIE_PWR_RST].rstc);
 	if (ret)
 		goto err_unprepare;
+
+	/*
+	 * Assure the reset is latched and the core is ready for DBI access.
+	 * On R-Car V4H, the PCIe reset is asynchronous and does not take
+	 * effect immediately, but needs a short time to complete. In case
+	 * DBI access happens in that short time, that access generates an
+	 * SError. To make sure that condition can never happen, read back the
+	 * state of the reset, which should turn the asynchronous reset into
+	 * synchronous one, and wait a little over 1ms to add additional
+	 * safety margin.
+	 */
+	reset_control_status(dw->core_rsts[DW_PCIE_PWR_RST].rstc);
+	fsleep(1000);
 
 	if (rcar->drvdata->additional_common_init)
 		rcar->drvdata->additional_common_init(rcar);
···
 }
 
 static const struct pci_epc_features rcar_gen4_pcie_epc_features = {
-	.linkup_notifier = false,
 	.msi_capable = true,
-	.msix_capable = false,
 	.bar[BAR_1] = { .type = BAR_RESERVED, },
 	.bar[BAR_3] = { .type = BAR_RESERVED, },
 	.bar[BAR_4] = { .type = BAR_FIXED, .fixed_size = 256 },
···
 	rcar_gen4_pcie_phy_reg_update_bits(rcar, 0x148, GENMASK(23, 22), BIT(22));
 	rcar_gen4_pcie_phy_reg_update_bits(rcar, 0x148, GENMASK(18, 16), GENMASK(17, 16));
 	rcar_gen4_pcie_phy_reg_update_bits(rcar, 0x148, GENMASK(7, 6), BIT(6));
-	rcar_gen4_pcie_phy_reg_update_bits(rcar, 0x148, GENMASK(2, 0), GENMASK(11, 0));
+	rcar_gen4_pcie_phy_reg_update_bits(rcar, 0x148, GENMASK(2, 0), GENMASK(1, 0));
 	rcar_gen4_pcie_phy_reg_update_bits(rcar, 0x1d4, GENMASK(16, 15), GENMASK(16, 15));
 	rcar_gen4_pcie_phy_reg_update_bits(rcar, 0x514, BIT(26), BIT(26));
 	rcar_gen4_pcie_phy_reg_update_bits(rcar, 0x0f8, BIT(16), 0);
···
 	val &= ~APP_HOLD_PHY_RST;
 	writel(val, rcar->base + PCIERSTCTRL1);
 
-	ret = readl_poll_timeout(rcar->phy_base + 0x0f8, val, !(val & BIT(18)), 100, 10000);
+	ret = readl_poll_timeout(rcar->phy_base + 0x0f8, val, val & BIT(18), 100, 10000);
 	if (ret < 0)
 		return ret;
 

drivers/pci/controller/dwc/pcie-stm32-ep.c

···
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * STMicroelectronics STM32MP25 PCIe endpoint driver.
+ *
+ * Copyright (C) 2025 STMicroelectronics
+ * Author: Christian Bruel <[e-mail]>
+ */
+
+#include <linux/clk.h>
+#include <linux/mfd/syscon.h>
+#include <linux/of_platform.h>
+#include <linux/of_gpio.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include "pcie-designware.h"
+#include "pcie-stm32.h"
+
+struct stm32_pcie {
+	struct dw_pcie pci;
+	struct regmap *regmap;
+	struct reset_control *rst;
+	struct phy *phy;
+	struct clk *clk;
+	struct gpio_desc *perst_gpio;
+	unsigned int perst_irq;
+};
+
+static void stm32_pcie_ep_init(struct dw_pcie_ep *ep)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+	enum pci_barno bar;
+
+	for (bar = 0; bar < PCI_STD_NUM_BARS; bar++)
+		dw_pcie_ep_reset_bar(pci, bar);
+}
+
+static int stm32_pcie_enable_link(struct dw_pcie *pci)
+{
+	struct stm32_pcie *stm32_pcie = to_stm32_pcie(pci);
+
+	regmap_update_bits(stm32_pcie->regmap, SYSCFG_PCIECR,
+			   STM32MP25_PCIECR_LTSSM_EN,
+			   STM32MP25_PCIECR_LTSSM_EN);
+
+	return dw_pcie_wait_for_link(pci);
+}
+
+static void stm32_pcie_disable_link(struct dw_pcie *pci)
+{
+	struct stm32_pcie *stm32_pcie = to_stm32_pcie(pci);
+
+	regmap_update_bits(stm32_pcie->regmap, SYSCFG_PCIECR, STM32MP25_PCIECR_LTSSM_EN, 0);
+}
+
+static int stm32_pcie_start_link(struct dw_pcie *pci)
+{
+	struct stm32_pcie *stm32_pcie = to_stm32_pcie(pci);
+	int ret;
+
+	dev_dbg(pci->dev, "Enable link\n");
+
+	ret = stm32_pcie_enable_link(pci);
+	if (ret) {
+		dev_err(pci->dev, "PCIe cannot establish link: %d\n", ret);
+		return ret;
+	}
+
+	enable_irq(stm32_pcie->perst_irq);
+
+	return 0;
+}
+
+static void stm32_pcie_stop_link(struct dw_pcie *pci)
+{
+	struct stm32_pcie *stm32_pcie = to_stm32_pcie(pci);
+
+	dev_dbg(pci->dev, "Disable link\n");
+
+	disable_irq(stm32_pcie->perst_irq);
+
+	stm32_pcie_disable_link(pci);
+}
+
+static int stm32_pcie_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
+				unsigned int type, u16 interrupt_num)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+
+	switch (type) {
+	case PCI_IRQ_INTX:
+		return dw_pcie_ep_raise_intx_irq(ep, func_no);
+	case PCI_IRQ_MSI:
+		return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);
+	default:
+		dev_err(pci->dev, "UNKNOWN IRQ type\n");
+		return -EINVAL;
+	}
+}
+
+static const struct pci_epc_features stm32_pcie_epc_features = {
+	.msi_capable = true,
+	.align = SZ_64K,
+};
+
+static const struct pci_epc_features*
+stm32_pcie_get_features(struct dw_pcie_ep *ep)
+{
+	return &stm32_pcie_epc_features;
+}
+
+static const struct dw_pcie_ep_ops stm32_pcie_ep_ops = {
+	.init = stm32_pcie_ep_init,
+	.raise_irq = stm32_pcie_raise_irq,
+	.get_features = stm32_pcie_get_features,
+};
+
+static const struct dw_pcie_ops dw_pcie_ops = {
+	.start_link = stm32_pcie_start_link,
+	.stop_link = stm32_pcie_stop_link,
+};
+
+static int stm32_pcie_enable_resources(struct stm32_pcie *stm32_pcie)
+{
+	int ret;
+
+	ret = phy_init(stm32_pcie->phy);
+	if (ret)
+		return ret;
+
+	ret = clk_prepare_enable(stm32_pcie->clk);
+	if (ret)
+		phy_exit(stm32_pcie->phy);
+
+	return ret;
+}
+
+static void stm32_pcie_disable_resources(struct stm32_pcie *stm32_pcie)
+{
+	clk_disable_unprepare(stm32_pcie->clk);
+
+	phy_exit(stm32_pcie->phy);
+}
+
+static void stm32_pcie_perst_assert(struct dw_pcie *pci)
+{
+	struct stm32_pcie *stm32_pcie = to_stm32_pcie(pci);
+	struct dw_pcie_ep *ep = &stm32_pcie->pci.ep;
+	struct device *dev = pci->dev;
+
+	dev_dbg(dev, "PERST asserted by host\n");
+
+	pci_epc_deinit_notify(ep->epc);
+
+	stm32_pcie_disable_resources(stm32_pcie);
+
+	pm_runtime_put_sync(dev);
+}
+
+static void stm32_pcie_perst_deassert(struct dw_pcie *pci)
+{
+	struct stm32_pcie *stm32_pcie = to_stm32_pcie(pci);
+	struct device *dev = pci->dev;
+	struct dw_pcie_ep *ep = &pci->ep;
+	int ret;
+
+	dev_dbg(dev, "PERST de-asserted by host\n");
+
+	ret = pm_runtime_resume_and_get(dev);
+	if (ret < 0) {
+		dev_err(dev, "Failed to resume runtime PM: %d\n", ret);
+		return;
+	}
+
+	ret = stm32_pcie_enable_resources(stm32_pcie);
+	if (ret) {
+		dev_err(dev, "Failed to enable resources: %d\n", ret);
+		goto err_pm_put_sync;
+	}
+
+	/*
+	 * Reprogram the configuration space registers here because the DBI
+	 * registers were reset by the PHY RCC during phy_init().
+	 */
+	ret = dw_pcie_ep_init_registers(ep);
+	if (ret) {
+		dev_err(dev, "Failed to complete initialization: %d\n", ret);
+		goto err_disable_resources;
+	}
+
+	pci_epc_init_notify(ep->epc);
+
+	return;
+
+err_disable_resources:
+	stm32_pcie_disable_resources(stm32_pcie);
+
+err_pm_put_sync:
+	pm_runtime_put_sync(dev);
+}
+
+static irqreturn_t stm32_pcie_ep_perst_irq_thread(int irq, void *data)
+{
+	struct stm32_pcie *stm32_pcie = data;
+	struct dw_pcie *pci = &stm32_pcie->pci;
+	u32 perst;
+
+	perst = gpiod_get_value(stm32_pcie->perst_gpio);
+	if (perst)
+		stm32_pcie_perst_assert(pci);
+	else
+		stm32_pcie_perst_deassert(pci);
+
+	irq_set_irq_type(gpiod_to_irq(stm32_pcie->perst_gpio),
+			 (perst ? IRQF_TRIGGER_HIGH : IRQF_TRIGGER_LOW));
+
+	return IRQ_HANDLED;
+}
+
+static int stm32_add_pcie_ep(struct stm32_pcie *stm32_pcie,
+			     struct platform_device *pdev)
+{
+	struct dw_pcie_ep *ep = &stm32_pcie->pci.ep;
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	ret = regmap_update_bits(stm32_pcie->regmap, SYSCFG_PCIECR,
+				 STM32MP25_PCIECR_TYPE_MASK,
+				 STM32MP25_PCIECR_EP);
+	if (ret)
+		return ret;
+
+	reset_control_assert(stm32_pcie->rst);
+	reset_control_deassert(stm32_pcie->rst);
+
+	ep->ops = &stm32_pcie_ep_ops;
+
+	ret = dw_pcie_ep_init(ep);
+	if (ret) {
+		dev_err(dev, "Failed to initialize ep: %d\n", ret);
+		return ret;
+	}
+
+	ret = stm32_pcie_enable_resources(stm32_pcie);
+	if (ret) {
+		dev_err(dev, "Failed to enable resources: %d\n", ret);
+		dw_pcie_ep_deinit(ep);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int stm32_pcie_probe(struct platform_device *pdev)
+{
+	struct stm32_pcie *stm32_pcie;
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	stm32_pcie = devm_kzalloc(dev, sizeof(*stm32_pcie), GFP_KERNEL);
+	if (!stm32_pcie)
+		return -ENOMEM;
+
+	stm32_pcie->pci.dev = dev;
+	stm32_pcie->pci.ops = &dw_pcie_ops;
+
+	stm32_pcie->regmap = syscon_regmap_lookup_by_compatible("st,stm32mp25-syscfg");
+	if (IS_ERR(stm32_pcie->regmap))
+		return dev_err_probe(dev, PTR_ERR(stm32_pcie->regmap),
+				     "No syscfg specified\n");
+
+	stm32_pcie->phy = devm_phy_get(dev, NULL);
+	if (IS_ERR(stm32_pcie->phy))
+		return dev_err_probe(dev, PTR_ERR(stm32_pcie->phy),
+				     "failed to get pcie-phy\n");
+
+	stm32_pcie->clk = devm_clk_get(dev, NULL);
+	if (IS_ERR(stm32_pcie->clk))
+		return dev_err_probe(dev, PTR_ERR(stm32_pcie->clk),
+				     "Failed to get PCIe clock source\n");
+
+	stm32_pcie->rst = devm_reset_control_get_exclusive(dev, NULL);
+	if (IS_ERR(stm32_pcie->rst))
+		return dev_err_probe(dev, PTR_ERR(stm32_pcie->rst),
+				     "Failed to get PCIe reset\n");
+
+	stm32_pcie->perst_gpio = devm_gpiod_get(dev, "reset", GPIOD_IN);
+	if (IS_ERR(stm32_pcie->perst_gpio))
+		return dev_err_probe(dev, PTR_ERR(stm32_pcie->perst_gpio),
+				     "Failed to get reset GPIO\n");
+
+	ret = phy_set_mode(stm32_pcie->phy, PHY_MODE_PCIE);
+	if (ret)
+		return ret;
+
+	platform_set_drvdata(pdev, stm32_pcie);
+
+	pm_runtime_get_noresume(dev);
+
+	ret = devm_pm_runtime_enable(dev);
+	if (ret < 0) {
+		pm_runtime_put_noidle(&pdev->dev);
+		return dev_err_probe(dev, ret, "Failed to enable runtime PM\n");
+	}
+
+	stm32_pcie->perst_irq = gpiod_to_irq(stm32_pcie->perst_gpio);
+
+	/* Will be enabled in start_link when device is initialized. */
+	irq_set_status_flags(stm32_pcie->perst_irq, IRQ_NOAUTOEN);
+
+	ret = devm_request_threaded_irq(dev, stm32_pcie->perst_irq, NULL,
+					stm32_pcie_ep_perst_irq_thread,
+					IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
+					"perst_irq", stm32_pcie);
+	if (ret) {
+		pm_runtime_put_noidle(&pdev->dev);
+		return dev_err_probe(dev, ret, "Failed to request PERST IRQ\n");
+	}
+
+	ret = stm32_add_pcie_ep(stm32_pcie, pdev);
+	if (ret)
+		pm_runtime_put_noidle(&pdev->dev);
+
+	return ret;
+}
+
+static void stm32_pcie_remove(struct platform_device *pdev)
+{
+	struct stm32_pcie *stm32_pcie = platform_get_drvdata(pdev);
+	struct dw_pcie *pci = &stm32_pcie->pci;
+	struct dw_pcie_ep *ep = &pci->ep;
+
+	dw_pcie_stop_link(pci);
+
+	pci_epc_deinit_notify(ep->epc);
+	dw_pcie_ep_deinit(ep);
+
+	stm32_pcie_disable_resources(stm32_pcie);
+
+	pm_runtime_put_sync(&pdev->dev);
+}
+
+static const struct of_device_id stm32_pcie_ep_of_match[] = {
+	{ .compatible = "st,stm32mp25-pcie-ep" },
+	{},
+};
+
+static struct platform_driver stm32_pcie_ep_driver = {
+	.probe = stm32_pcie_probe,
+	.remove = stm32_pcie_remove,
+	.driver = {
+		.name = "stm32-ep-pcie",
+		.of_match_table = stm32_pcie_ep_of_match,
+	},
+};
+
+module_platform_driver(stm32_pcie_ep_driver);
+
+MODULE_AUTHOR("Christian Bruel <[e-mail]>");
+MODULE_DESCRIPTION("STM32MP25 PCIe Endpoint Controller driver");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(of, stm32_pcie_ep_of_match);

drivers/pci/controller/dwc/pcie-stm32.c

···
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * STMicroelectronics STM32MP25 PCIe root complex driver.
+ *
+ * Copyright (C) 2025 STMicroelectronics
+ * Author: Christian Bruel <[e-mail]>
+ */
+
+#include <linux/clk.h>
+#include <linux/mfd/syscon.h>
+#include <linux/of_platform.h>
+#include <linux/phy/phy.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/pm_wakeirq.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include "pcie-designware.h"
+#include "pcie-stm32.h"
+#include "../../pci.h"
+
+struct stm32_pcie {
+	struct dw_pcie pci;
+	struct regmap *regmap;
+	struct reset_control *rst;
+	struct phy *phy;
+	struct clk *clk;
+	struct gpio_desc *perst_gpio;
+	struct gpio_desc *wake_gpio;
+};
+
+static void stm32_pcie_deassert_perst(struct stm32_pcie *stm32_pcie)
+{
+	if (stm32_pcie->perst_gpio) {
+		msleep(PCIE_T_PVPERL_MS);
+		gpiod_set_value(stm32_pcie->perst_gpio, 0);
+	}
+
+	msleep(PCIE_RESET_CONFIG_WAIT_MS);
+}
+
+static void stm32_pcie_assert_perst(struct stm32_pcie *stm32_pcie)
+{
+	gpiod_set_value(stm32_pcie->perst_gpio, 1);
+}
+
+static int stm32_pcie_start_link(struct dw_pcie *pci)
+{
+	struct stm32_pcie *stm32_pcie = to_stm32_pcie(pci);
+
+	return regmap_update_bits(stm32_pcie->regmap, SYSCFG_PCIECR,
+				  STM32MP25_PCIECR_LTSSM_EN,
+				  STM32MP25_PCIECR_LTSSM_EN);
+}
+
+static void stm32_pcie_stop_link(struct dw_pcie *pci)
+{
+	struct stm32_pcie *stm32_pcie = to_stm32_pcie(pci);
+
+	regmap_update_bits(stm32_pcie->regmap, SYSCFG_PCIECR,
+			   STM32MP25_PCIECR_LTSSM_EN, 0);
+}
+
+static int stm32_pcie_suspend_noirq(struct device *dev)
+{
+	struct stm32_pcie *stm32_pcie = dev_get_drvdata(dev);
+	int ret;
+
+	ret = dw_pcie_suspend_noirq(&stm32_pcie->pci);
+	if (ret)
+		return ret;
+
+	stm32_pcie_assert_perst(stm32_pcie);
+
+	clk_disable_unprepare(stm32_pcie->clk);
+
+	if (!device_wakeup_path(dev))
+		phy_exit(stm32_pcie->phy);
+
+	return pinctrl_pm_select_sleep_state(dev);
+}
+
+static int stm32_pcie_resume_noirq(struct device *dev)
+{
+	struct stm32_pcie *stm32_pcie = dev_get_drvdata(dev);
+	int ret;
+
+	/*
+	 * The core clock is gated with CLKREQ# from the COMBOPHY REFCLK,
+	 * thus if no device is present, must deassert it with a GPIO from
+	 * pinctrl pinmux before accessing the DBI registers.
+	 */
+	ret = pinctrl_pm_select_init_state(dev);
+	if (ret) {
+		dev_err(dev, "Failed to activate pinctrl pm state: %d\n", ret);
+		return ret;
+	}
+
+	if (!device_wakeup_path(dev)) {
+		ret = phy_init(stm32_pcie->phy);
+		if (ret) {
+			pinctrl_pm_select_default_state(dev);
+			return ret;
+		}
+	}
+
+	ret = clk_prepare_enable(stm32_pcie->clk);
+	if (ret)
+		goto err_phy_exit;
+
+	stm32_pcie_deassert_perst(stm32_pcie);
+
+	ret = dw_pcie_resume_noirq(&stm32_pcie->pci);
+	if (ret)
+		goto err_disable_clk;
+
+	pinctrl_pm_select_default_state(dev);
+
+	return 0;
+
+err_disable_clk:
+	stm32_pcie_assert_perst(stm32_pcie);
+	clk_disable_unprepare(stm32_pcie->clk);
+
+err_phy_exit:
+	phy_exit(stm32_pcie->phy);
+	pinctrl_pm_select_default_state(dev);
+
+	return ret;
+}
+
+static const struct dev_pm_ops stm32_pcie_pm_ops = {
+	NOIRQ_SYSTEM_SLEEP_PM_OPS(stm32_pcie_suspend_noirq,
+				  stm32_pcie_resume_noirq)
+};
+
+static const struct dw_pcie_host_ops stm32_pcie_host_ops = {
+};
+
+static const struct dw_pcie_ops dw_pcie_ops = {
+	.start_link = stm32_pcie_start_link,
+	.stop_link = stm32_pcie_stop_link
+};
+
+static int stm32_add_pcie_port(struct stm32_pcie *stm32_pcie)
+{
+	struct device *dev = stm32_pcie->pci.dev;
+	unsigned int wake_irq;
+	int ret;
+
+	ret = phy_set_mode(stm32_pcie->phy, PHY_MODE_PCIE);
+	if (ret)
+		return ret;
+
+	ret = phy_init(stm32_pcie->phy);
+	if (ret)
+		return ret;
+
+	ret = regmap_update_bits(stm32_pcie->regmap, SYSCFG_PCIECR,
+				 STM32MP25_PCIECR_TYPE_MASK,
+				 STM32MP25_PCIECR_RC);
+	if (ret)
+		goto err_phy_exit;
+
+	stm32_pcie_deassert_perst(stm32_pcie);
+
+	if (stm32_pcie->wake_gpio) {
+		wake_irq = gpiod_to_irq(stm32_pcie->wake_gpio);
+		ret = dev_pm_set_dedicated_wake_irq(dev, wake_irq);
+		if (ret) {
+			dev_err(dev, "Failed to enable wakeup irq %d\n", ret);
+			goto err_assert_perst;
+		}
+		irq_set_irq_type(wake_irq, IRQ_TYPE_EDGE_FALLING);
+	}
+
+	return 0;
+
+err_assert_perst:
+	stm32_pcie_assert_perst(stm32_pcie);
+
+err_phy_exit:
+	phy_exit(stm32_pcie->phy);
+
+	return ret;
+}
+
+static void stm32_remove_pcie_port(struct stm32_pcie *stm32_pcie)
+{
+	dev_pm_clear_wake_irq(stm32_pcie->pci.dev);
+
+	stm32_pcie_assert_perst(stm32_pcie);
+
+	phy_exit(stm32_pcie->phy);
+}
+
+static int stm32_pcie_parse_port(struct stm32_pcie *stm32_pcie)
+{
+	struct device *dev = stm32_pcie->pci.dev;
+	struct device_node *root_port;
+
+	root_port = of_get_next_available_child(dev->of_node, NULL);
+
+	stm32_pcie->phy = devm_of_phy_get(dev, root_port, NULL);
+	if (IS_ERR(stm32_pcie->phy)) {
+		of_node_put(root_port);
+		return dev_err_probe(dev, PTR_ERR(stm32_pcie->phy),
+				     "Failed to get pcie-phy\n");
+	}
+
+	stm32_pcie->perst_gpio = devm_fwnode_gpiod_get(dev, of_fwnode_handle(root_port),
+						       "reset", GPIOD_OUT_HIGH, NULL);
+	if (IS_ERR(stm32_pcie->perst_gpio)) {
+		if (PTR_ERR(stm32_pcie->perst_gpio) != -ENOENT) {
+			of_node_put(root_port);
+			return dev_err_probe(dev, PTR_ERR(stm32_pcie->perst_gpio),
+					     "Failed to get reset GPIO\n");
+		}
+		stm32_pcie->perst_gpio = NULL;
+	}
+
+	stm32_pcie->wake_gpio = devm_fwnode_gpiod_get(dev, of_fwnode_handle(root_port),
+						      "wake", GPIOD_IN, NULL);
+
+	if (IS_ERR(stm32_pcie->wake_gpio)) {
+		if (PTR_ERR(stm32_pcie->wake_gpio) != -ENOENT) {
+			of_node_put(root_port);
+			return dev_err_probe(dev, PTR_ERR(stm32_pcie->wake_gpio),
+					     "Failed to get wake GPIO\n");
+		}
+		stm32_pcie->wake_gpio = NULL;
+	}
+
+	of_node_put(root_port);
+
+	return 0;
+}
+
+static int stm32_pcie_probe(struct platform_device *pdev)
+{
+	struct stm32_pcie *stm32_pcie;
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	stm32_pcie = devm_kzalloc(dev, sizeof(*stm32_pcie), GFP_KERNEL);
+	if (!stm32_pcie)
+		return -ENOMEM;
+
+	stm32_pcie->pci.dev = dev;
+	stm32_pcie->pci.ops = &dw_pcie_ops;
+	stm32_pcie->pci.pp.ops = &stm32_pcie_host_ops;
+
+	stm32_pcie->regmap = syscon_regmap_lookup_by_compatible("st,stm32mp25-syscfg");
+	if (IS_ERR(stm32_pcie->regmap))
+		return dev_err_probe(dev, PTR_ERR(stm32_pcie->regmap),
+				     "No syscfg specified\n");
+
+	stm32_pcie->clk = devm_clk_get(dev, NULL);
+	if (IS_ERR(stm32_pcie->clk))
+		return dev_err_probe(dev, PTR_ERR(stm32_pcie->clk),
+				     "Failed to get PCIe clock source\n");
+
+	stm32_pcie->rst = devm_reset_control_get_exclusive(dev, NULL);
+	if (IS_ERR(stm32_pcie->rst))
+		return dev_err_probe(dev, PTR_ERR(stm32_pcie->rst),
+				     "Failed to get PCIe reset\n");
+
+	ret = stm32_pcie_parse_port(stm32_pcie);
+	if (ret)
+		return ret;
+
+	platform_set_drvdata(pdev, stm32_pcie);
+
+	ret = stm32_add_pcie_port(stm32_pcie);
+	if (ret)
+		return ret;
+
+	reset_control_assert(stm32_pcie->rst);
+	reset_control_deassert(stm32_pcie->rst);
+
+	ret = clk_prepare_enable(stm32_pcie->clk);
+	if (ret) {
+		dev_err(dev, "Core clock enable failed %d\n", ret);
+		goto err_remove_port;
+	}
+
+	ret = pm_runtime_set_active(dev);
+	if (ret < 0) {
+		dev_err_probe(dev, ret, "Failed to activate runtime PM\n");
+		goto err_disable_clk;
+	}
+
+	pm_runtime_no_callbacks(dev);
+
+	ret = devm_pm_runtime_enable(dev);
+	if (ret < 0) {
+		dev_err_probe(dev, ret, "Failed to enable runtime PM\n");
+		goto err_disable_clk;
+	}
+
+	ret = dw_pcie_host_init(&stm32_pcie->pci.pp);
+	if (ret)
+		goto err_disable_clk;
+
+	if (stm32_pcie->wake_gpio)
+		device_init_wakeup(dev, true);
+
+	return 0;
+
+err_disable_clk:
+	clk_disable_unprepare(stm32_pcie->clk);
+
+err_remove_port:
+	stm32_remove_pcie_port(stm32_pcie);
+
+	return ret;
+}
+
+static void stm32_pcie_remove(struct platform_device *pdev)
+{
+	struct stm32_pcie *stm32_pcie = platform_get_drvdata(pdev);
+	struct dw_pcie_rp *pp = &stm32_pcie->pci.pp;
+
+	if (stm32_pcie->wake_gpio)
+		device_init_wakeup(&pdev->dev, false);
+
+	dw_pcie_host_deinit(pp);
+
+	clk_disable_unprepare(stm32_pcie->clk);
+
+	stm32_remove_pcie_port(stm32_pcie);
+
+	pm_runtime_put_noidle(&pdev->dev);
+}
+
+static const struct of_device_id stm32_pcie_of_match[] = {
+	{ .compatible = "st,stm32mp25-pcie-rc" },
+	{},
+};
+
+static struct platform_driver stm32_pcie_driver = {
+	.probe = stm32_pcie_probe,
+	.remove = stm32_pcie_remove,
+	.driver = {
+		.name = "stm32-pcie",
+		.of_match_table = stm32_pcie_of_match,
+		.pm = &stm32_pcie_pm_ops,
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
+	},
+};
+
+module_platform_driver(stm32_pcie_driver);
+
+MODULE_AUTHOR("Christian Bruel <[e-mail]>");
+MODULE_DESCRIPTION("STM32MP25 PCIe Controller driver");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(of, stm32_pcie_of_match);

drivers/pci/controller/dwc/pcie-stm32.h

···
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * ST PCIe driver definitions for STM32-MP25 SoC
+ *
+ * Copyright (C) 2025 STMicroelectronics - All Rights Reserved
+ * Author: Christian Bruel <[e-mail]>
+ */
+
+#define to_stm32_pcie(x)	dev_get_drvdata((x)->dev)
+
+#define STM32MP25_PCIECR_TYPE_MASK	GENMASK(11, 8)
+#define STM32MP25_PCIECR_EP		0
+#define STM32MP25_PCIECR_LTSSM_EN	BIT(2)
+#define STM32MP25_PCIECR_RC		BIT(10)
+
+#define SYSCFG_PCIECR			0x6000

drivers/pci/controller/dwc/pcie-tegra194.c

···
 	struct mrq_uphy_response resp;
 	struct tegra_bpmp_message msg;
 	struct mrq_uphy_request req;
+	int err;
 
 	/*
 	 * Controller-5 doesn't need to have its state set by BPMP-FW in
···
 	msg.rx.data = &resp;
 	msg.rx.size = sizeof(resp);
 
-	return tegra_bpmp_transfer(pcie->bpmp, &msg);
+	err = tegra_bpmp_transfer(pcie->bpmp, &msg);
+	if (err)
+		return err;
+	if (msg.rx.ret)
+		return -EINVAL;
+
+	return 0;
 }
 
 static int tegra_pcie_bpmp_set_pll_state(struct tegra_pcie_dw *pcie,
···
 	struct mrq_uphy_response resp;
 	struct tegra_bpmp_message msg;
 	struct mrq_uphy_request req;
+	int err;
 
 	memset(&req, 0, sizeof(req));
 	memset(&resp, 0, sizeof(resp));
···
 	msg.rx.data = &resp;
 	msg.rx.size = sizeof(resp);
 
-	return tegra_bpmp_transfer(pcie->bpmp, &msg);
+	err = tegra_bpmp_transfer(pcie->bpmp, &msg);
+	if (err)
+		return err;
+	if (msg.rx.ret)
+		return -EINVAL;
+
+	return 0;
 }
 
 static void tegra_pcie_downstream_dev_to_D0(struct tegra_pcie_dw *pcie)
 {
 	struct dw_pcie_rp *pp = &pcie->pci.pp;
-	struct pci_bus *child, *root_bus = NULL;
+	struct pci_bus *child, *root_port_bus = NULL;
 	struct pci_dev *pdev;
 
 	/*
···
 	 */
 
 	list_for_each_entry(child, &pp->bridge->bus->children, node) {
-		/* Bring downstream devices to D0 if they are not already in */
 		if (child->parent == pp->bridge->bus) {
-			root_bus = child;
+			root_port_bus = child;
 			break;
 		}
 	}
 
-	if (!root_bus) {
-		dev_err(pcie->dev, "Failed to find downstream devices\n");
+	if (!root_port_bus) {
+		dev_err(pcie->dev, "Failed to find downstream bus of Root Port\n");
 		return;
 	}
 
-	list_for_each_entry(pdev, &root_bus->devices, bus_list) {
+	/* Bring downstream devices to D0 if they are not already in */
+	list_for_each_entry(pdev, &root_port_bus->devices, bus_list) {
 		if (PCI_SLOT(pdev->devfn) == 0) {
 			if (pci_set_power_state(pdev, PCI_D0))
 				dev_err(pcie->dev,
···
 				ret);
 	}
 
-	ret = tegra_pcie_bpmp_set_pll_state(pcie, false);
+	ret = tegra_pcie_bpmp_set_ctrl_state(pcie, false);
 	if (ret)
-		dev_err(pcie->dev, "Failed to turn off UPHY: %d\n", ret);
+		dev_err(pcie->dev, "Failed to disable controller: %d\n", ret);
 
 	pcie->ep_state = EP_STATE_DISABLED;
 	dev_dbg(pcie->dev, "Uninitialization of endpoint is completed\n");
···
 	return IRQ_HANDLED;
 }
 
+static void tegra_pcie_ep_init(struct dw_pcie_ep *ep)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+	enum pci_barno bar;
+
+	for (bar = 0; bar < PCI_STD_NUM_BARS; bar++)
+		dw_pcie_ep_reset_bar(pci, bar);
+};
+
 static int tegra_pcie_ep_raise_intx_irq(struct tegra_pcie_dw *pcie, u16 irq)
 {
 	/* Tegra194 supports only INTA */
···
 
 static int tegra_pcie_ep_raise_msi_irq(struct tegra_pcie_dw *pcie, u16 irq)
 {
-	if (unlikely(irq > 31))
+	if (unlikely(irq > 32))
 		return -EINVAL;
 
-	appl_writel(pcie, BIT(irq), APPL_MSI_CTRL_1);
+	appl_writel(pcie, BIT(irq - 1), APPL_MSI_CTRL_1);
 
 	return 0;
 }
···
 
 static const struct pci_epc_features tegra_pcie_epc_features = {
 	.linkup_notifier = true,
-	.msi_capable = false,
-	.msix_capable = false,
+	.msi_capable = true,
 	.bar[BAR_0] = { .type = BAR_FIXED, .fixed_size = SZ_1M,
 			.only_64bit = true, },
 	.bar[BAR_1] = { .type = BAR_RESERVED, },
···
 }
 
 static const struct dw_pcie_ep_ops pcie_ep_ops = {
+	.init = tegra_pcie_ep_init,
 	.raise_irq = tegra_pcie_ep_raise_irq,
 	.get_features = tegra_pcie_ep_get_features,
 };

drivers/pci/controller/pci-hyperv.c

···
 /**
  * hv_msi_free() - Free the MSI.
  * @domain:	The interrupt domain pointer
- * @info:	Extra MSI-related context
  * @irq:	Identifies the IRQ.
  *
  * The Hyper-V parent partition and hypervisor are tracking the
···
  * table up to date.  This callback sends a message that frees
  * the IRT entry and related tracking nonsense.
  */
-static void hv_msi_free(struct irq_domain *domain, struct msi_domain_info *info,
-			unsigned int irq)
+static void hv_msi_free(struct irq_domain *domain, unsigned int irq)
 {
 	struct hv_pcibus_device *hbus;
 	struct hv_pci_dev *hpdev;
···
 
 static void hv_pcie_domain_free(struct irq_domain *d, unsigned int virq, unsigned int nr_irqs)
 {
-	struct msi_domain_info *info = d->host_data;
-
 	for (int i = 0; i < nr_irqs; i++)
-		hv_msi_free(d, info, virq + i);
+		hv_msi_free(d, virq + i);
 
 	irq_domain_free_irqs_top(d, virq, nr_irqs);
 }

drivers/pci/controller/pci-tegra.c

···
  */
 
 #include <linux/clk.h>
+#include <linux/cleanup.h>
 #include <linux/debugfs.h>
 #include <linux/delay.h>
 #include <linux/export.h>
···
 	DECLARE_BITMAP(used, INT_PCI_MSI_NR);
 	struct irq_domain *domain;
 	struct mutex map_lock;
-	spinlock_t mask_lock;
+	raw_spinlock_t mask_lock;
 	void *virt;
 	dma_addr_t phys;
 	int irq;
···
 	unsigned int i;
 	int err;
 
-	port->phys = devm_kcalloc(dev, sizeof(phy), port->lanes, GFP_KERNEL);
+	port->phys = devm_kcalloc(dev, port->lanes, sizeof(phy), GFP_KERNEL);
 	if (!port->phys)
 		return -ENOMEM;
 
···
 	struct tegra_msi *msi = irq_data_get_irq_chip_data(d);
 	struct tegra_pcie *pcie = msi_to_pcie(msi);
 	unsigned int index = d->hwirq / 32;
-	unsigned long flags;
 	u32 value;
 
-	spin_lock_irqsave(&msi->mask_lock, flags);
-	value = afi_readl(pcie, AFI_MSI_EN_VEC(index));
-	value &= ~BIT(d->hwirq % 32);
-	afi_writel(pcie, value, AFI_MSI_EN_VEC(index));
-	spin_unlock_irqrestore(&msi->mask_lock, flags);
+	scoped_guard(raw_spinlock_irqsave, &msi->mask_lock) {
+		value = afi_readl(pcie, AFI_MSI_EN_VEC(index));
+		value &= ~BIT(d->hwirq % 32);
+		afi_writel(pcie, value, AFI_MSI_EN_VEC(index));
+	}
 }
 
 static void tegra_msi_irq_unmask(struct irq_data *d)
···
 	struct tegra_msi *msi = irq_data_get_irq_chip_data(d);
 	struct tegra_pcie *pcie = msi_to_pcie(msi);
 	unsigned int index = d->hwirq / 32;
-	unsigned long flags;
 	u32 value;
 
-	spin_lock_irqsave(&msi->mask_lock, flags);
-	value = afi_readl(pcie, AFI_MSI_EN_VEC(index));
-	value |= BIT(d->hwirq % 32);
-	afi_writel(pcie, value, AFI_MSI_EN_VEC(index));
-	spin_unlock_irqrestore(&msi->mask_lock, flags);
+	scoped_guard(raw_spinlock_irqsave, &msi->mask_lock) {
+		value = afi_readl(pcie, AFI_MSI_EN_VEC(index));
+		value |= BIT(d->hwirq % 32);
+		afi_writel(pcie, value, AFI_MSI_EN_VEC(index));
+	}
 }
 
 static void tegra_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
···
 	int err;
 
 	mutex_init(&msi->map_lock);
-	spin_lock_init(&msi->mask_lock);
+	raw_spin_lock_init(&msi->mask_lock);
 
 	if (IS_ENABLED(CONFIG_PCI_MSI)) {
 		err = tegra_allocate_domains(msi);

drivers/pci/controller/pci-xgene-msi.c

···
 		msi_val = xgene_msi_int_read(xgene_msi, i);
 		if (msi_val) {
 			dev_err(&pdev->dev, "Failed to clear spurious IRQ\n");
-			return EINVAL;
+			return -EINVAL;
 		}
 
 		irq = platform_get_irq(pdev, i);

drivers/pci/controller/pcie-mediatek-gen3.c

···
 #define PCIE_MSI_SET_ADDR_HI_BASE	0xc80
 #define PCIE_MSI_SET_ADDR_HI_OFFSET	0x04
 
+#define PCIE_RESOURCE_CTRL_REG		0xd2c
+#define PCIE_RSRC_SYS_CLK_RDY_TIME_MASK	GENMASK(7, 0)
+
 #define PCIE_ICMD_PM_REG		0x198
 #define PCIE_TURN_OFF_LINK		BIT(4)
 
···
  * struct mtk_gen3_pcie_pdata - differentiate between host generations
  * @power_up: pcie power_up callback
  * @phy_resets: phy reset lines SoC data.
+ * @sys_clk_rdy_time_us: System clock ready time override (microseconds)
  * @flags: pcie device flags.
  */
 struct mtk_gen3_pcie_pdata {
···
 		const char *id[MAX_NUM_PHY_RESETS];
 		int num_resets;
 	} phy_resets;
+	u8 sys_clk_rdy_time_us;
 	u32 flags;
 };
 
···
 		val &= ~PCIE_CONF_LINK2_LCR2_LINK_SPEED;
 		val |= FIELD_PREP(PCIE_CONF_LINK2_LCR2_LINK_SPEED, pcie->max_link_speed);
 		writel_relaxed(val, pcie->base + PCIE_CONF_LINK2_CTL_STS);
+	}
+
+	/* If parameter is present, adjust SYS_CLK_RDY_TIME to avoid glitching */
+	if (pcie->soc->sys_clk_rdy_time_us) {
+		val = readl_relaxed(pcie->base + PCIE_RESOURCE_CTRL_REG);
+		FIELD_MODIFY(PCIE_RSRC_SYS_CLK_RDY_TIME_MASK, &val,
+			     pcie->soc->sys_clk_rdy_time_us);
+		writel_relaxed(val, pcie->base + PCIE_RESOURCE_CTRL_REG);
 	}
 
 	/* Set class code */
···
 	},
 };
 
+static const struct mtk_gen3_pcie_pdata mtk_pcie_soc_mt8196 = {
+	.power_up = mtk_pcie_power_up,
+	.phy_resets = {
+		.id[0] = "phy",
+		.num_resets = 1,
+	},
+	.sys_clk_rdy_time_us = 10,
+};
+
 static const struct mtk_gen3_pcie_pdata mtk_pcie_soc_en7581 = {
 	.power_up = mtk_pcie_en7581_power_up,
 	.phy_resets = {
···
 static const struct of_device_id mtk_pcie_of_match[] = {
 	{ .compatible = "airoha,en7581-pcie", .data = &mtk_pcie_soc_en7581 },
 	{ .compatible = "mediatek,mt8192-pcie", .data = &mtk_pcie_soc_mt8192 },
+	{ .compatible = "mediatek,mt8196-pcie", .data = &mtk_pcie_soc_mt8196 },
 	{},
 };
 MODULE_DEVICE_TABLE(of, mtk_pcie_of_match);

drivers/pci/controller/pcie-rcar-ep.c

···
 }
 
 static const struct pci_epc_features rcar_pcie_epc_features = {
-	.linkup_notifier = false,
 	.msi_capable = true,
-	.msix_capable = false,
 	/* use 64-bit BARs so mark BAR[1,3,5] as reserved */
 	.bar[BAR_0] = { .type = BAR_FIXED, .fixed_size = 128,
 			.only_64bit = true, },

drivers/pci/controller/pcie-rcar-host.c

···
  */
 
 #include <linux/bitops.h>
+#include <linux/cleanup.h>
 #include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/delay.h>
···
 	DECLARE_BITMAP(used, INT_PCI_MSI_NR);
 	struct irq_domain *domain;
 	struct mutex map_lock;
-	spinlock_t mask_lock;
+	raw_spinlock_t mask_lock;
 	int irq1;
 	int irq2;
 };
···
 	int			(*phy_init_fn)(struct rcar_pcie_host *host);
 };
 
-static DEFINE_SPINLOCK(pmsr_lock);
-
 static int rcar_pcie_wakeup(struct device *pcie_dev, void __iomem *pcie_base)
 {
-	unsigned long flags;
 	u32 pmsr, val;
 	int ret = 0;
 
-	spin_lock_irqsave(&pmsr_lock, flags);
-
-	if (!pcie_base || pm_runtime_suspended(pcie_dev)) {
-		ret = -EINVAL;
-		goto unlock_exit;
-	}
+	if (!pcie_base || pm_runtime_suspended(pcie_dev))
+		return -EINVAL;
 
 	pmsr = readl(pcie_base + PMSR);
 
···
 		writel(L1FAEG | PMEL1RX, pcie_base + PMSR);
 	}
 
-unlock_exit:
-	spin_unlock_irqrestore(&pmsr_lock, flags);
 	return ret;
 }
 
···
 		unsigned int index = find_first_bit(&reg, 32);
 		int ret;
 
-		ret = generic_handle_domain_irq(msi->domain->parent, index);
+		ret = generic_handle_domain_irq(msi->domain, index);
 		if (ret) {
 			/* Unknown MSI, just clear it */
 			dev_dbg(dev, "unexpected MSI\n");
···
 {
 	struct rcar_msi *msi = irq_data_get_irq_chip_data(d);
 	struct rcar_pcie *pcie = &msi_to_host(msi)->pcie;
-	unsigned long flags;
 	u32 value;
 
-	spin_lock_irqsave(&msi->mask_lock, flags);
-	value = rcar_pci_read_reg(pcie, PCIEMSIIER);
-	value &= ~BIT(d->hwirq);
-	rcar_pci_write_reg(pcie, value, PCIEMSIIER);
-	spin_unlock_irqrestore(&msi->mask_lock, flags);
+	scoped_guard(raw_spinlock_irqsave, &msi->mask_lock) {
+		value = rcar_pci_read_reg(pcie, PCIEMSIIER);
+		value &= ~BIT(d->hwirq);
+		rcar_pci_write_reg(pcie, value, PCIEMSIIER);
+	}
 }
 
 static void rcar_msi_irq_unmask(struct irq_data *d)
 {
 	struct rcar_msi *msi = irq_data_get_irq_chip_data(d);
 	struct rcar_pcie *pcie = &msi_to_host(msi)->pcie;
-	unsigned long flags;
 	u32 value;
 
-	spin_lock_irqsave(&msi->mask_lock, flags);
-	value = rcar_pci_read_reg(pcie, PCIEMSIIER);
-	value |= BIT(d->hwirq);
-	rcar_pci_write_reg(pcie, value, PCIEMSIIER);
-	spin_unlock_irqrestore(&msi->mask_lock, flags);
+	scoped_guard(raw_spinlock_irqsave, &msi->mask_lock) {
+		value = rcar_pci_read_reg(pcie, PCIEMSIIER);
+		value |= BIT(d->hwirq);
+		rcar_pci_write_reg(pcie, value, PCIEMSIIER);
+	}
 }
 
 static void rcar_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
···
 	int err;
 
 	mutex_init(&msi->map_lock);
-	spin_lock_init(&msi->mask_lock);
+	raw_spin_lock_init(&msi->mask_lock);
 
 	err = of_address_to_resource(dev->of_node, 0, &res);
 	if (err)

drivers/pci/controller/pcie-rockchip-ep.c

···
 static const struct pci_epc_features rockchip_pcie_epc_features = {
 	.linkup_notifier = true,
 	.msi_capable = true,
-	.msix_capable = false,
 	.intx_capable = true,
 	.align = ROCKCHIP_PCIE_AT_SIZE_ALIGN,
 };

drivers/pci/controller/pcie-xilinx-nwl.c

···
 	nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, E_ECAM_CONTROL) |
 			  E_ECAM_CR_ENABLE, E_ECAM_CONTROL);
 
-	nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, E_ECAM_CONTROL) |
-			  (NWL_ECAM_MAX_SIZE << E_ECAM_SIZE_SHIFT),
-			  E_ECAM_CONTROL);
+	ecam_val = nwl_bridge_readl(pcie, E_ECAM_CONTROL);
+	ecam_val &= ~E_ECAM_SIZE_LOC;
+	ecam_val |= NWL_ECAM_MAX_SIZE << E_ECAM_SIZE_SHIFT;
+	nwl_bridge_writel(pcie, ecam_val, E_ECAM_CONTROL);
 
 	nwl_bridge_writel(pcie, lower_32_bits(pcie->phys_ecam_base),
 			  E_ECAM_BASE_LO);

drivers/pci/controller/plda/pcie-plda-host.c

···
 
 	bridge = devm_pci_alloc_host_bridge(dev, 0);
 	if (!bridge)
-		return dev_err_probe(dev, -ENOMEM,
-				     "failed to alloc bridge\n");
+		return -ENOMEM;
 
 	if (port->host_ops && port->host_ops->host_init) {
 		ret = port->host_ops->host_init(port);

drivers/pci/endpoint/functions/pci-epf-test.c

···
 	if (!epf_test->dma_supported)
 		return;
 
-	dma_release_channel(epf_test->dma_chan_tx);
-	if (epf_test->dma_chan_tx == epf_test->dma_chan_rx) {
+	if (epf_test->dma_chan_tx) {
+		dma_release_channel(epf_test->dma_chan_tx);
+		if (epf_test->dma_chan_tx == epf_test->dma_chan_rx) {
+			epf_test->dma_chan_tx = NULL;
+			epf_test->dma_chan_rx = NULL;
+			return;
+		}
 		epf_test->dma_chan_tx = NULL;
-		epf_test->dma_chan_rx = NULL;
-		return;
 	}
 
-	dma_release_channel(epf_test->dma_chan_rx);
-	epf_test->dma_chan_rx = NULL;
+	if (epf_test->dma_chan_rx) {
+		dma_release_channel(epf_test->dma_chan_rx);
+		epf_test->dma_chan_rx = NULL;
+	}
 }
 
 static void pci_epf_test_print_rate(struct pci_epf_test *epf_test,
···
 	u32 status = le32_to_cpu(reg->status);
 	struct pci_epf *epf = epf_test->epf;
 	struct pci_epc *epc = epf->epc;
+	int ret;
 
 	if (bar < BAR_0)
 		goto set_status_err;
 
 	pci_epf_test_doorbell_cleanup(epf_test);
-	pci_epc_clear_bar(epc, epf->func_no, epf->vfunc_no, &epf_test->db_bar);
+
+	/*
+	 * The doorbell feature temporarily overrides the inbound translation
+	 * to point to the address stored in epf_test->db_bar.phys_addr, i.e.,
+	 * it calls set_bar() twice without ever calling clear_bar(), as
+	 * calling clear_bar() would clear the BAR's PCI address assigned by
+	 * the host. Thus, when disabling the doorbell, restore the inbound
+	 * translation to point to the memory allocated for the BAR.
+	 */
+	ret = pci_epc_set_bar(epc, epf->func_no, epf->vfunc_no, &epf->bar[bar]);
+	if (ret)
+		goto set_status_err;
 
 	status |= STATUS_DOORBELL_DISABLE_SUCCESS;
 	reg->status = cpu_to_le32(status);
···
 		if (bar == test_reg_bar)
 			continue;
 
-		base = pci_epf_alloc_space(epf, bar_size[bar], bar,
+		if (epc_features->bar[bar].type == BAR_FIXED)
+			test_reg_size = epc_features->bar[bar].fixed_size;
+		else
+			test_reg_size = bar_size[bar];
+
+		base = pci_epf_alloc_space(epf, test_reg_size, bar,
 					   epc_features, PRIMARY_INTERFACE);
 		if (!base)
 			dev_err(dev, "Failed to allocate space for BAR%d\n",

drivers/pci/endpoint/pci-ep-msi.c

···
 	struct pci_epf *epf;
 
 	epc = pci_epc_get(dev_name(msi_desc_to_dev(desc)));
-	if (!epc)
+	if (IS_ERR(epc))
 		return;
 
 	epf = list_first_entry_or_null(&epc->pci_epf, struct pci_epf, list);

drivers/pci/hotplug/cpqphp_pci.c

···
 
 			dbg("found io_node(base, length) = %x, %x\n",
 					io_node->base, io_node->length);
-			dbg("populated slot =%d \n", populated_slot);
+			dbg("populated slot = %d\n", populated_slot);
 			if (!populated_slot) {
 				io_node->next = ctrl->io_head;
 				ctrl->io_head = io_node;
···
 
 			dbg("found mem_node(base, length) = %x, %x\n",
 					mem_node->base, mem_node->length);
-			dbg("populated slot =%d \n", populated_slot);
+			dbg("populated slot = %d\n", populated_slot);
 			if (!populated_slot) {
 				mem_node->next = ctrl->mem_head;
 				ctrl->mem_head = mem_node;
···
 			p_mem_node->length = pre_mem_length << 16;
 			dbg("found p_mem_node(base, length) = %x, %x\n",
 					p_mem_node->base, p_mem_node->length);
-			dbg("populated slot =%d \n", populated_slot);
+			dbg("populated slot = %d\n", populated_slot);
 
 			if (!populated_slot) {
 				p_mem_node->next = ctrl->p_mem_head;
···
 			bus_node->length = max_bus - secondary_bus + 1;
 			dbg("found bus_node(base, length) = %x, %x\n",
 					bus_node->base, bus_node->length);
-			dbg("populated slot =%d \n", populated_slot);
+			dbg("populated slot = %d\n", populated_slot);
 			if (!populated_slot) {
 				bus_node->next = ctrl->bus_head;
 				ctrl->bus_head = bus_node;

drivers/pci/hotplug/ibmphp_hpc.c

···
 	unsigned long ultemp;
 	unsigned long data;	// actual data HILO format
 
-	debug_polling("%s - Entry WPGBbar[%p] index[%x] \n", __func__, WPGBbar, index);
+	debug_polling("%s - Entry WPGBbar[%p] index[%x]\n", __func__, WPGBbar, index);
 
 	//--------------------------------------------------------------------
 	// READ - step 1
···
 		ultemp = ultemp << 8;
 		data |= ultemp;
 	} else {
-		err("this controller type is not supported \n");
+		err("this controller type is not supported\n");
 		return HPC_ERROR;
 	}
 
···
 		ultemp = ultemp << 8;
 		data |= ultemp;
 	} else {
-		err("this controller type is not supported \n");
+		err("this controller type is not supported\n");
 		return HPC_ERROR;
 	}
 

drivers/pci/iov.c

···
 	if (dev->no_vf_scan)
 		return 0;
 
+	pci_lock_rescan_remove();
 	for (i = 0; i < num_vfs; i++) {
 		rc = pci_iov_add_virtfn(dev, i);
 		if (rc)
 			goto failed;
 	}
+	pci_unlock_rescan_remove();
 	return 0;
 failed:
 	while (i--)
 		pci_iov_remove_virtfn(dev, i);
+	pci_unlock_rescan_remove();
 
 	return rc;
 }
···
 	struct pci_sriov *iov = dev->sriov;
 	int i;
 
+	pci_lock_rescan_remove();
 	for (i = 0; i < iov->num_VFs; i++)
 		pci_iov_remove_virtfn(dev, i);
+	pci_unlock_rescan_remove();
 }
 
 static void sriov_disable(struct pci_dev *dev)

drivers/pci/of_property.c

···
 			mapp++;
 			*mapp = out_irq[i].np->phandle;
 			mapp++;
-			if (addr_sz[i]) {
-				ret = of_property_read_u32_array(out_irq[i].np,
-								 "reg", mapp,
-								 addr_sz[i]);
-				if (ret)
-					goto failed;
-			}
+
+			/*
+			 * A device address does not affect the device <->
+			 * interrupt-controller HW connection for all
+			 * modern interrupt controllers; moreover, the
+			 * kernel (i.e., of_irq_parse_raw()) ignores the
+			 * values in the parent unit address cells while
+			 * parsing the interrupt-map property because they
+			 * are irrelevant for interrupt mapping in modern
+			 * systems.
+			 *
+			 * Leave the parent unit address initialized to 0 --
+			 * just take into account the #address-cells size
+			 * to build the property properly.
+			 */
 			mapp += addr_sz[i];
 			memcpy(mapp, out_irq[i].args,
 			       out_irq[i].args_count * sizeof(u32));

drivers/pci/p2pdma.c

···
 pages_free:
 	devm_memunmap_pages(&pdev->dev, pgmap);
 pgmap_free:
-	devm_kfree(&pdev->dev, pgmap);
+	devm_kfree(&pdev->dev, p2p_pgmap);
 	return error;
 }
 EXPORT_SYMBOL_GPL(pci_p2pdma_add_resource);
···
  * pci_has_p2pmem - check if a given PCI device has published any p2pmem
  * @pdev: PCI device to check
  */
-bool pci_has_p2pmem(struct pci_dev *pdev)
+static bool pci_has_p2pmem(struct pci_dev *pdev)
 {
 	struct pci_p2pdma *p2pdma;
 	bool res;
···
 
 	return res;
 }
-EXPORT_SYMBOL_GPL(pci_has_p2pmem);
 
 /**
  * pci_p2pmem_find_many - find a peer-to-peer DMA memory device compatible with

drivers/pci/pci-acpi.c

···
 
 bool pci_acpi_preserve_config(struct pci_host_bridge *host_bridge)
 {
+	bool ret = false;
+
 	if (ACPI_HANDLE(&host_bridge->dev)) {
 		union acpi_object *obj;
 
···
 					      1, DSM_PCI_PRESERVE_BOOT_CONFIG,
 					      NULL, ACPI_TYPE_INTEGER);
 		if (obj && obj->integer.value == 0)
-			return true;
+			ret = true;
 		ACPI_FREE(obj);
 	}
 
-	return false;
+	return ret;
 }
 
 /* _HPX PCI Setting Record (Type 0); same as _HPP */

drivers/pci/pci-driver.c

···
 	return 0;
 }
 
-#if defined(CONFIG_PCIEAER) || defined(CONFIG_EEH)
+#if defined(CONFIG_PCIEAER) || defined(CONFIG_EEH) || defined(CONFIG_S390)
 /**
  * pci_uevent_ers - emit a uevent during recovery path of PCI device
  * @pdev: PCI device undergoing error recovery
···
 	switch (err_type) {
 	case PCI_ERS_RESULT_NONE:
 	case PCI_ERS_RESULT_CAN_RECOVER:
+	case PCI_ERS_RESULT_NEED_RESET:
 		envp[idx++] = "ERROR_EVENT=BEGIN_RECOVERY";
 		envp[idx++] = "DEVICE_ONLINE=0";
 		break;

drivers/pci/pci-sysfs.c

···
 #include <linux/msi.h>
 #include <linux/of.h>
 #include <linux/aperture.h>
+#include <linux/unaligned.h>
 #include "pci.h"
 
 #ifndef ARCH_PCI_DEV_GROUPS
···
 
 	for (i = 0; i < max; i++) {
 		struct resource *res =  &pci_dev->resource[i];
+		struct resource zerores = {};
+
+		/* For backwards compatibility */
+		if (i >= PCI_BRIDGE_RESOURCES && i <= PCI_BRIDGE_RESOURCE_END &&
+		    res->flags & (IORESOURCE_UNSET | IORESOURCE_DISABLED))
+			res = &zerores;
+
 		pci_resource_to_user(pci_dev, i, res, &start, &end);
 		len += sysfs_emit_at(buf, len, "0x%016llx 0x%016llx 0x%016llx\n",
 				     (unsigned long long)start,
···
 				   struct device_attribute *attr, char *buf)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
+	ssize_t ret;
 
-	return sysfs_emit(buf, "%u\n", pcie_get_width_cap(pdev));
+	/* We read PCI_EXP_LNKCAP, so we need the device to be accessible. */
+	pci_config_pm_runtime_get(pdev);
+	ret = sysfs_emit(buf, "%u\n", pcie_get_width_cap(pdev));
+	pci_config_pm_runtime_put(pdev);
+
+	return ret;
 }
 static DEVICE_ATTR_RO(max_link_width);
 
···
 	int err;
 	enum pci_bus_speed speed;
 
+	pci_config_pm_runtime_get(pci_dev);
 	err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
+	pci_config_pm_runtime_put(pci_dev);
+
 	if (err)
 		return -EINVAL;
 
···
 	u16 linkstat;
 	int err;
 
+	pci_config_pm_runtime_get(pci_dev);
 	err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
+	pci_config_pm_runtime_put(pci_dev);
+
 	if (err)
 		return -EINVAL;
 
···
 	u8 sec_bus;
 	int err;
 
+	pci_config_pm_runtime_get(pci_dev);
 	err = pci_read_config_byte(pci_dev, PCI_SECONDARY_BUS, &sec_bus);
+	pci_config_pm_runtime_put(pci_dev);
+
 	if (err)
 		return -EINVAL;
 
···
 	u8 sub_bus;
 	int err;
 
+	pci_config_pm_runtime_get(pci_dev);
 	err = pci_read_config_byte(pci_dev, PCI_SUBORDINATE_BUS, &sub_bus);
+	pci_config_pm_runtime_put(pci_dev);
+
 	if (err)
 		return -EINVAL;
 
···
 			     IORESOURCE_ROM_SHADOW));
 }
 static DEVICE_ATTR_RO(boot_vga);
+
+static ssize_t serial_number_show(struct device *dev,
+				  struct device_attribute *attr, char *buf)
+{
+	struct pci_dev *pci_dev = to_pci_dev(dev);
+	u64 dsn;
+	u8 bytes[8];
+
+	dsn = pci_get_dsn(pci_dev);
+	if (!dsn)
+		return -EIO;
+
+	put_unaligned_be64(dsn, bytes);
+	return sysfs_emit(buf, "%8phD\n", bytes);
+}
+static DEVICE_ATTR_ADMIN_RO(serial_number);
 
 static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
 			       const struct bin_attribute *bin_attr, char *buf,
···
 				       const char *buf, size_t count)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
-	unsigned long size, flags;
+	struct pci_bus *bus = pdev->bus;
+	struct resource *b_win, *res;
+	unsigned long size;
 	int ret, i;
 	u16 cmd;
 
 	if (kstrtoul(buf, 0, &size) < 0)
+		return -EINVAL;
+
+	b_win = pbus_select_window(bus, pci_resource_n(pdev, n));
+	if (!b_win)
 		return -EINVAL;
 
 	device_lock(dev);
···
 	pci_write_config_word(pdev, PCI_COMMAND,
 			      cmd & ~PCI_COMMAND_MEMORY);
 
-	flags = pci_resource_flags(pdev, n);
-
 	pci_remove_resource_files(pdev);
 
-	for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) {
-		if (pci_resource_len(pdev, i) &&
-		    pci_resource_flags(pdev, i) == flags)
+	pci_dev_for_each_resource(pdev, res, i) {
+		if (i >= PCI_BRIDGE_RESOURCES)
+			break;
+
+		if (b_win == pbus_select_window(bus, res))
 			pci_release_resource(pdev, i);
 	}
 
 	ret = pci_resize_resource(pdev, n, size);
 
-	pci_assign_unassigned_bus_resources(pdev->bus);
+	pci_assign_unassigned_bus_resources(bus);
 
 	if (pci_create_resource_files(pdev))
 		pci_warn(pdev, "Failed to recreate resource files after BAR resizing\n");
···
 
 static struct attribute *pci_dev_dev_attrs[] = {
 	&dev_attr_boot_vga.attr,
+	&dev_attr_serial_number.attr,
 	NULL,
 };
 
···
 	struct pci_dev *pdev = to_pci_dev(dev);
 
 	if (a == &dev_attr_boot_vga.attr && pci_is_vga(pdev))
+		return a->mode;
+
+	if (a == &dev_attr_serial_number.attr && pci_get_dsn(pdev))
 		return a->mode;
 
 	return 0;

drivers/pci/pci.c

···
 	return 1;
 }
 
-static u8 __pci_find_next_cap_ttl(struct pci_bus *bus, unsigned int devfn,
-				  u8 pos, int cap, int *ttl)
-{
-	u8 id;
-	u16 ent;
-
-	pci_bus_read_config_byte(bus, devfn, pos, &pos);
-
-	while ((*ttl)--) {
-		if (pos < 0x40)
-			break;
-		pos &= ~3;
-		pci_bus_read_config_word(bus, devfn, pos, &ent);
-
-		id = ent & 0xff;
-		if (id == 0xff)
-			break;
-		if (id == cap)
-			return pos;
-		pos = (ent >> 8);
-	}
-	return 0;
-}
-
 static u8 __pci_find_next_cap(struct pci_bus *bus, unsigned int devfn,
 			      u8 pos, int cap)
 {
-	int ttl = PCI_FIND_CAP_TTL;
-
-	return __pci_find_next_cap_ttl(bus, devfn, pos, cap, &ttl);
+	return PCI_FIND_NEXT_CAP(pci_bus_read_config, pos, cap, bus, devfn);
 }
 
 u8 pci_find_next_capability(struct pci_dev *dev, u8 pos, int cap)
···
  */
 u16 pci_find_next_ext_capability(struct pci_dev *dev, u16 start, int cap)
 {
-	u32 header;
-	int ttl;
-	u16 pos = PCI_CFG_SPACE_SIZE;
-
-	/* minimum 8 bytes per capability */
-	ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8;
-
 	if (dev->cfg_size <= PCI_CFG_SPACE_SIZE)
 		return 0;
 
-	if (start)
-		pos = start;
-
-	if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL)
-		return 0;
-
-	/*
-	 * If we have no capabilities, this is indicated by cap ID,
-	 * cap version and next pointer all being 0.
-	 */
-	if (header == 0)
-		return 0;
-
-	while (ttl-- > 0) {
-		if (PCI_EXT_CAP_ID(header) == cap && pos != start)
-			return pos;
-
-		pos = PCI_EXT_CAP_NEXT(header);
-		if (pos < PCI_CFG_SPACE_SIZE)
-			break;
-
-		if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL)
-			break;
-	}
-
-	return 0;
+	return PCI_FIND_NEXT_EXT_CAP(pci_bus_read_config, start, cap,
+				     dev->bus, dev->devfn);
 }
 EXPORT_SYMBOL_GPL(pci_find_next_ext_capability);
 
···
 
 static u8 __pci_find_next_ht_cap(struct pci_dev *dev, u8 pos, int ht_cap)
 {
-	int rc, ttl = PCI_FIND_CAP_TTL;
+	int rc;
 	u8 cap, mask;
 
 	if (ht_cap == HT_CAPTYPE_SLAVE || ht_cap == HT_CAPTYPE_HOST)
···
 	else
 		mask = HT_5BIT_CAP_MASK;
 
-	pos = __pci_find_next_cap_ttl(dev->bus, dev->devfn, pos,
-				      PCI_CAP_ID_HT, &ttl);
+	pos = PCI_FIND_NEXT_CAP(pci_bus_read_config, pos,
+				PCI_CAP_ID_HT, dev->bus, dev->devfn);
 	while (pos) {
 		rc = pci_read_config_byte(dev, pos + 3, &cap);
 		if (rc != PCIBIOS_SUCCESSFUL)
···
 		if ((cap & mask) == ht_cap)
 			return pos;
 
-		pos = __pci_find_next_cap_ttl(dev->bus, dev->devfn,
-					      pos + PCI_CAP_LIST_NEXT,
-					      PCI_CAP_ID_HT, &ttl);
+		pos = PCI_FIND_NEXT_CAP(pci_bus_read_config,
+					pos + PCI_CAP_LIST_NEXT,
+					PCI_CAP_ID_HT, dev->bus,
+					dev->devfn);
 	}
 
 	return 0;
···
 		else
 			dev->current_state = state;
 
+		return -EIO;
+	}
+
+	if (pci_dev_is_disconnected(dev)) {
+		dev->current_state = PCI_D3cold;
 		return -EIO;
 	}
 

drivers/pci/pci.h

···
 #ifndef DRIVERS_PCI_H
 #define DRIVERS_PCI_H
 
+#include <linux/align.h>
+#include <linux/bitfield.h>
 #include <linux/pci.h>
 
 struct pcie_tlp_log;
 
 /* Number of possible devfns: 0.0 to 1f.7 inclusive */
 #define MAX_NR_DEVFNS 256
+#define PCI_MAX_NR_DEVS	32
 
 #define MAX_NR_LANES 16
 
···
 #define PCIE_MSG_CODE_DEASSERT_INTC	0x26
 #define PCIE_MSG_CODE_DEASSERT_INTD	0x27
 
+#define PCI_BUS_BRIDGE_IO_WINDOW	0
+#define PCI_BUS_BRIDGE_MEM_WINDOW	1
+#define PCI_BUS_BRIDGE_PREF_MEM_WINDOW	2
+
 extern const unsigned char pcie_link_speed[];
 extern bool pci_early_dump;
+
+extern struct mutex pci_rescan_remove_lock;
 
 bool pcie_cap_has_lnkctl(const struct pci_dev *dev);
 bool pcie_cap_has_lnkctl2(const struct pci_dev *dev);
 bool pcie_cap_has_rtctl(const struct pci_dev *dev);
+
+/* Standard Capability finder */
+/**
+ * PCI_FIND_NEXT_CAP - Find a PCI standard capability
+ * @read_cfg: Function pointer for reading PCI config space
+ * @start: Starting position to begin search
+ * @cap: Capability ID to find
+ * @args: Arguments to pass to read_cfg function
+ *
+ * Search the capability list in PCI config space to find @cap.
+ * Implements TTL (time-to-live) protection against infinite loops.
+ *
+ * Return: Position of the capability if found, 0 otherwise.
+ */
+#define PCI_FIND_NEXT_CAP(read_cfg, start, cap, args...)		\
+({									\
+	int __ttl = PCI_FIND_CAP_TTL;					\
+	u8 __id, __found_pos = 0;					\
+	u8 __pos = (start);						\
+	u16 __ent;							\
+									\
+	read_cfg##_byte(args, __pos, &__pos);				\
+									\
+	while (__ttl--) {						\
+		if (__pos < PCI_STD_HEADER_SIZEOF)			\
+			break;						\
+									\
+		__pos = ALIGN_DOWN(__pos, 4);				\
+		read_cfg##_word(args, __pos, &__ent);			\
+									\
+		__id = FIELD_GET(PCI_CAP_ID_MASK, __ent);		\
+		if (__id == 0xff)					\
+			break;						\
+									\
+		if (__id == (cap)) {					\
+			__found_pos = __pos;				\
+			break;						\
+		}							\
+									\
+		__pos = FIELD_GET(PCI_CAP_LIST_NEXT_MASK, __ent);	\
+	}								\
+	__found_pos;							\
+})
+
+/* Extended Capability finder */
+/**
+ * PCI_FIND_NEXT_EXT_CAP - Find a PCI extended capability
+ * @read_cfg: Function pointer for reading PCI config space
+ * @start: Starting position to begin search (0 for initial search)
+ * @cap: Extended capability ID to find
+ * @args: Arguments to pass to read_cfg function
+ *
+ * Search the extended capability list in PCI config space to find @cap.
+ * Implements TTL protection against infinite loops using a calculated
+ * maximum search count.
+ *
+ * Return: Position of the capability if found, 0 otherwise.
+ */
+#define PCI_FIND_NEXT_EXT_CAP(read_cfg, start, cap, args...)		\
+({									\
+	u16 __pos = (start) ?: PCI_CFG_SPACE_SIZE;			\
+	u16 __found_pos = 0;						\
+	int __ttl, __ret;						\
+	u32 __header;							\
+									\
+	__ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8;	\
+	while (__ttl-- > 0 && __pos >= PCI_CFG_SPACE_SIZE) {		\
+		__ret = read_cfg##_dword(args, __pos, &__header);	\
+		if (__ret != PCIBIOS_SUCCESSFUL)			\
+			break;						\
+									\
+		if (__header == 0)					\
+			break;						\
+									\
+		if (PCI_EXT_CAP_ID(__header) == (cap) && __pos != start) {\
+			__found_pos = __pos;				\
+			break;						\
+		}							\
+									\
+		__pos = PCI_EXT_CAP_NEXT(__header);			\
+	}								\
+	__found_pos;							\
+})
 
 /* Functions internal to the PCI core code */
 
···
 void pci_put_host_bridge_device(struct device *dev);
 
 unsigned int pci_rescan_bus_bridge_resize(struct pci_dev *bridge);
-int pci_reassign_bridge_resources(struct pci_dev *bridge, unsigned long type);
+int pbus_reassign_bridge_resources(struct pci_bus *bus, struct resource *res);
 int __must_check pci_reassign_resource(struct pci_dev *dev, int i, resource_size_t add_size, resource_size_t align);
 
 int pci_configure_extended_tags(struct pci_dev *dev, void *ign);
···
 	return resno;
 }
 
+struct resource *pbus_select_window(struct pci_bus *bus,
+				    const struct resource *res);
 void pci_reassigndev_resource_alignment(struct pci_dev *dev);
 void pci_disable_bridge_window(struct pci_dev *dev);
 struct pci_bus *pci_bus_get(struct pci_bus *bus);

drivers/pci/pcie/aer.c

···
 #define AER_ERROR_SOURCES_MAX		128
 
 #define AER_MAX_TYPEOF_COR_ERRS		16	/* as per PCI_ERR_COR_STATUS */
-#define AER_MAX_TYPEOF_UNCOR_ERRS	27	/* as per PCI_ERR_UNCOR_STATUS*/
+#define AER_MAX_TYPEOF_UNCOR_ERRS	32	/* as per PCI_ERR_UNCOR_STATUS*/
 
 struct aer_err_source {
 	u32 status;			/* PCI_ERR_ROOT_STATUS */
···
 };
 
 #define AER_LOG_TLP_MASKS		(PCI_ERR_UNC_POISON_TLP|	\
+					PCI_ERR_UNC_POISON_BLK |	\
 					PCI_ERR_UNC_ECRC|		\
 					PCI_ERR_UNC_UNSUP|		\
 					PCI_ERR_UNC_COMP_ABORT|		\
 					PCI_ERR_UNC_UNX_COMP|		\
-					PCI_ERR_UNC_MALF_TLP)
+					PCI_ERR_UNC_ACSV |		\
+					PCI_ERR_UNC_MCBTLP |		\
+					PCI_ERR_UNC_ATOMEG |		\
+					PCI_ERR_UNC_DMWR_BLK |		\
+					PCI_ERR_UNC_XLAT_BLK |		\
+					PCI_ERR_UNC_TLPPRE |		\
+					PCI_ERR_UNC_MALF_TLP |		\
+					PCI_ERR_UNC_IDE_CHECK |		\
+					PCI_ERR_UNC_MISR_IDE |		\
+					PCI_ERR_UNC_PCRC_CHECK)
 
 #define SYSTEM_ERROR_INTR_ON_MESG_MASK	(PCI_EXP_RTCTL_SECEE|	\
 					PCI_EXP_RTCTL_SENFEE|	\
···
 		return;
 
 	dev->aer_info = kzalloc(sizeof(*dev->aer_info), GFP_KERNEL);
+	if (!dev->aer_info) {
+		dev->aer_cap = 0;
+		return;
+	}
 
 	ratelimit_state_init(&dev->aer_info->correctable_ratelimit,
 			     DEFAULT_RATELIMIT_INTERVAL, DEFAULT_RATELIMIT_BURST);
···
 	"AtomicOpBlocked",		/* Bit Position 24	*/
 	"TLPBlockedErr",		/* Bit Position 25	*/
 	"PoisonTLPBlocked",		/* Bit Position 26	*/
-	NULL,				/* Bit Position 27	*/
-	NULL,				/* Bit Position 28	*/
-	NULL,				/* Bit Position 29	*/
-	NULL,				/* Bit Position 30	*/
-	NULL,				/* Bit Position 31	*/
+	"DMWrReqBlocked",		/* Bit Position 27	*/
+	"IDECheck",			/* Bit Position 28	*/
+	"MisIDETLP",			/* Bit Position 29	*/
+	"PCRC_CHECK",			/* Bit Position 30	*/
+	"TLPXlatBlocked",		/* Bit Position 31	*/
 };
 
 static const char *aer_agent_string[] = {
···
 
 static int aer_ratelimit(struct pci_dev *dev, unsigned int severity)
 {
+	if (!dev->aer_info)
+		return 1;
+
 	switch (severity) {
 	case AER_NONFATAL:
 		return __ratelimit(&dev->aer_info->nonfatal_ratelimit);
···
 	default:
 		return 1;	/* Don't ratelimit fatal errors */
 	}
+}
+
+static bool tlp_header_logged(u32 status, u32 capctl)
+{
+	/* Errors for which a header is always logged (PCIe r7.0 sec 6.2.7) */
+	if (status & AER_LOG_TLP_MASKS)
+		return true;
+
+	/* Completion Timeout header is only logged on capable devices */
+	if (status & PCI_ERR_UNC_COMP_TIME &&
+	    capctl & PCI_ERR_CAP_COMP_TIME_LOG)
+		return true;
+
+	return false;
 }
 
 static void __aer_print_error(struct pci_dev *dev, struct aer_err_info *info)
···
 		status = aer->uncor_status;
 		mask = aer->uncor_mask;
 		info.level = KERN_ERR;
-		tlp_header_valid = status & AER_LOG_TLP_MASKS;
+		tlp_header_valid = tlp_header_logged(status, aer->cap_control);
 	}
 
 	info.status = status;
···
 		pci_read_config_dword(dev, aer + PCI_ERR_CAP, &aercc);
 		info->first_error = PCI_ERR_CAP_FEP(aercc);
 
-		if (info->status & AER_LOG_TLP_MASKS) {
+		if (tlp_header_logged(info->status, aercc)) {
 			info->tlp_header_valid = 1;
 			pcie_read_tlp_log(dev, aer + PCI_ERR_HEADER_LOG,
 					  aer + PCI_ERR_PREFIX_LOG,

drivers/pci/pcie/aspm.c

···
 #include <linux/math.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
+#include <linux/of.h>
 #include <linux/pci.h>
 #include <linux/pci_regs.h>
 #include <linux/errno.h>
···
 	u32 aspm_support:7;		/* Supported ASPM state */
 	u32 aspm_enabled:7;		/* Enabled ASPM state */
 	u32 aspm_capable:7;		/* Capable ASPM state with latency */
-	u32 aspm_default:7;		/* Default ASPM state by BIOS */
+	u32 aspm_default:7;		/* Default ASPM state by BIOS or
+					   override */
 	u32 aspm_disable:7;		/* Disabled ASPM state */
 
 	/* Clock PM state */
 	u32 clkpm_capable:1;		/* Clock PM capable? */
 	u32 clkpm_enabled:1;		/* Current Clock PM state */
-	u32 clkpm_default:1;		/* Default Clock PM state by BIOS */
+	u32 clkpm_default:1;		/* Default Clock PM state by BIOS or
+					   override */
 	u32 clkpm_disable:1;		/* Clock PM disabled */
 };
 
···
 	pcie_set_clkpm_nocheck(link, enable);
 }
 
+static void pcie_clkpm_override_default_link_state(struct pcie_link_state *link,
+						   int enabled)
+{
+	struct pci_dev *pdev = link->downstream;
+
+	/* For devicetree platforms, enable ClockPM by default */
+	if (of_have_populated_dt() && !enabled) {
+		link->clkpm_default = 1;
+		pci_info(pdev, "ASPM: DT platform, enabling ClockPM\n");
+	}
+}
+
 static void pcie_clkpm_cap_init(struct pcie_link_state *link, int blacklist)
 {
 	int capable = 1, enabled = 1;
···
 	}
 	link->clkpm_enabled = enabled;
 	link->clkpm_default = enabled;
+	pcie_clkpm_override_default_link_state(link, enabled);
 	link->clkpm_capable = capable;
 	link->clkpm_disable = blacklist ? 1 : 0;
 }
···
 		aspm_calc_l12_info(link, parent_l1ss_cap, child_l1ss_cap);
 }
 
+#define FLAG(x, y, d)	(((x) & (PCIE_LINK_STATE_##y)) ? d : "")
+
+static void pcie_aspm_override_default_link_state(struct pcie_link_state *link)
+{
+	struct pci_dev *pdev = link->downstream;
+	u32 override;
+
+	/* For devicetree platforms, enable all ASPM states by default */
+	if (of_have_populated_dt()) {
+		link->aspm_default = PCIE_LINK_STATE_ASPM_ALL;
+		override = link->aspm_default & ~link->aspm_enabled;
+		if (override)
+			pci_info(pdev, "ASPM: DT platform, enabling%s%s%s%s%s%s%s\n",
+				 FLAG(override, L0S_UP, " L0s-up"),
+				 FLAG(override, L0S_DW, " L0s-dw"),
+				 FLAG(override, L1, " L1"),
+				 FLAG(override, L1_1, " ASPM-L1.1"),
+				 FLAG(override, L1_2, " ASPM-L1.2"),
+				 FLAG(override, L1_1_PCIPM, " PCI-PM-L1.1"),
+				 FLAG(override, L1_2_PCIPM, " PCI-PM-L1.2"));
+	}
+}
+
 static void pcie_aspm_cap_init(struct pcie_link_state *link, int blacklist)
 {
 	struct pci_dev *child = link->downstream, *parent = link->pdev;
···
 
 	/* Save default state */
 	link->aspm_default = link->aspm_enabled;
+
+	pcie_aspm_override_default_link_state(link);
 
 	/* Setup initial capable state. Will be updated later */
 	link->aspm_capable = link->aspm_support;

drivers/pci/pcie/err.c

···
 	return report_error_detected(dev, pci_channel_io_normal, data);
 }
 
+static int report_perm_failure_detected(struct pci_dev *dev, void *data)
+{
+	struct pci_driver *pdrv;
+	const struct pci_error_handlers *err_handler;
+
+	device_lock(&dev->dev);
+	pdrv = dev->driver;
+	if (!pdrv || !pdrv->err_handler || !pdrv->err_handler->error_detected)
+		goto out;
+
+	err_handler = pdrv->err_handler;
+	err_handler->error_detected(dev, pci_channel_io_perm_failure);
+out:
+	pci_uevent_ers(dev, PCI_ERS_RESULT_DISCONNECT);
+	device_unlock(&dev->dev);
+	return 0;
+}
+
 static int report_mmio_enabled(struct pci_dev *dev, void *data)
 {
 	struct pci_driver *pdrv;
···
 
 	device_lock(&dev->dev);
 	pdrv = dev->driver;
-	if (!pdrv || !pdrv->err_handler || !pdrv->err_handler->slot_reset)
+	if (!pci_dev_set_io_state(dev, pci_channel_io_normal) ||
+	    !pdrv || !pdrv->err_handler || !pdrv->err_handler->slot_reset)
 		goto out;
 
 	err_handler = pdrv->err_handler;
···
 	pci_walk_bridge(bridge, pci_pm_runtime_get_sync, NULL);
 
 	pci_dbg(bridge, "broadcast error_detected message\n");
-	if (state == pci_channel_io_frozen) {
+	if (state == pci_channel_io_frozen)
 		pci_walk_bridge(bridge, report_frozen_detected, &status);
-		if (reset_subordinates(bridge) != PCI_ERS_RESULT_RECOVERED) {
-			pci_warn(bridge, "subordinate device reset failed\n");
-			goto failed;
-		}
-	} else {
+	else
 		pci_walk_bridge(bridge, report_normal_detected, &status);
-	}
 
 	if (status == PCI_ERS_RESULT_CAN_RECOVER) {
 		status = PCI_ERS_RESULT_RECOVERED;
 		pci_dbg(bridge, "broadcast mmio_enabled message\n");
 		pci_walk_bridge(bridge, report_mmio_enabled, &status);
+	}
+
+	if (status == PCI_ERS_RESULT_NEED_RESET ||
+	    state == pci_channel_io_frozen) {
+		if (reset_subordinates(bridge) != PCI_ERS_RESULT_RECOVERED) {
+			pci_warn(bridge, "subordinate device reset failed\n");
+			goto failed;
+		}
 	}
 
 	if (status == PCI_ERS_RESULT_NEED_RESET) {
···
 failed:
 	pci_walk_bridge(bridge, pci_pm_runtime_put, NULL);
 
-	pci_uevent_ers(bridge, PCI_ERS_RESULT_DISCONNECT);
+	pci_walk_bridge(bridge, report_perm_failure_detected, NULL);
 
 	pci_info(bridge, "device recovery failed\n");
 

drivers/pci/probe.c

···
  * PCI detection and setup code
  */
 
+#include <linux/array_size.h>
 #include <linux/kernel.h>
 #include <linux/delay.h>
 #include <linux/init.h>
···
 		limit |= ((unsigned long) io_limit_hi << 16);
 	}
 
+	res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
+
 	if (base <= limit) {
-		res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
 		region.start = base;
 		region.end = limit + io_granularity - 1;
 		pcibios_bus_to_resource(dev->bus, res, &region);
 		if (log)
 			pci_info(dev, "  bridge window %pR\n", res);
+	} else {
+		resource_set_range(res, 0, 0);
+		res->flags |= IORESOURCE_UNSET | IORESOURCE_DISABLED;
 	}
 }
 
···
 	pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
 	base = ((unsigned long) mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
 	limit = ((unsigned long) mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
+
+	res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
+
 	if (base <= limit) {
-		res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
 		region.start = base;
 		region.end = limit + 0xfffff;
 		pcibios_bus_to_resource(dev->bus, res, &region);
 		if (log)
 			pci_info(dev, "  bridge window %pR\n", res);
+	} else {
+		resource_set_range(res, 0, 0);
+		res->flags |= IORESOURCE_UNSET | IORESOURCE_DISABLED;
 	}
 }
 
···
 		return;
 	}
 
+	res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) | IORESOURCE_MEM |
+		     IORESOURCE_PREFETCH;
+	if (res->flags & PCI_PREF_RANGE_TYPE_64)
+		res->flags |= IORESOURCE_MEM_64;
+
 	if (base <= limit) {
-		res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) |
-					 IORESOURCE_MEM | IORESOURCE_PREFETCH;
-		if (res->flags & PCI_PREF_RANGE_TYPE_64)
-			res->flags |= IORESOURCE_MEM_64;
 		region.start = base;
 		region.end = limit + 0xfffff;
 		pcibios_bus_to_resource(dev->bus, res, &region);
 		if (log)
 			pci_info(dev, "  bridge window %pR\n", res);
+	} else {
+		resource_set_range(res, 0, 0);
+		res->flags |= IORESOURCE_UNSET | IORESOURCE_DISABLED;
 	}
 }
 
···
 	}
 	if (io) {
 		bridge->io_window = 1;
-		pci_read_bridge_io(bridge, &res, true);
+		pci_read_bridge_io(bridge,
+				   pci_resource_n(bridge, PCI_BRIDGE_IO_WINDOW),
+				   true);
 	}
 
-	pci_read_bridge_mmio(bridge, &res, true);
+	pci_read_bridge_mmio(bridge,
+			     pci_resource_n(bridge, PCI_BRIDGE_MEM_WINDOW),
+			     true);
 
 	/*
 	 * DECchip 21050 pass 2 errata: the bridge may miss an address
···
 			bridge->pref_64_window = 1;
 	}
 
-	pci_read_bridge_mmio_pref(bridge, &res, true);
+	pci_read_bridge_mmio_pref(bridge,
+				  pci_resource_n(bridge,
+						 PCI_BRIDGE_PREF_MEM_WINDOW),
+				  true);
 }
 
 void pci_read_bridge_bases(struct pci_bus *child)
···
 	for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
 		child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
 
-	pci_read_bridge_io(child->self, child->resource[0], false);
-	pci_read_bridge_mmio(child->self, child->resource[1], false);
-	pci_read_bridge_mmio_pref(child->self, child->resource[2], false);
+	pci_read_bridge_io(child->self,
+			   child->resource[PCI_BUS_BRIDGE_IO_WINDOW], false);
+	pci_read_bridge_mmio(child->self,
+			     child->resource[PCI_BUS_BRIDGE_MEM_WINDOW], false);
+	pci_read_bridge_mmio_pref(child->self,
+				  child->resource[PCI_BUS_BRIDGE_PREF_MEM_WINDOW],
+				  false);
 
 	if (!dev->transparent)
 		return;
···
 
 static void early_dump_pci_device(struct pci_dev *pdev)
 {
-	u32 value[256 / 4];
+	u32 value[PCI_CFG_SPACE_SIZE / sizeof(u32)];
 	int i;
 
 	pci_info(pdev, "config space:\n");
 
-	for (i = 0; i < 256; i += 4)
-		pci_read_config_dword(pdev, i, &value[i / 4]);
+	for (i = 0; i < ARRAY_SIZE(value); i++)
+		pci_read_config_dword(pdev, i * sizeof(u32), &value[i]);
 
 	print_hex_dump(KERN_INFO, "", DUMP_PREFIX_OFFSET, 16, 1,
-		       value, 256, false);
+		       value, ARRAY_SIZE(value) * sizeof(u32), false);
 }
 
 static const char *pci_type_str(struct pci_dev *dev)
···
 	dev->sysdata = dev->bus->sysdata;
 	dev->dev.parent = dev->bus->bridge;
 	dev->dev.bus = &pci_bus_type;
-	dev->hdr_type = hdr_type & 0x7f;
-	dev->multifunction = !!(hdr_type & 0x80);
+	dev->hdr_type = FIELD_GET(PCI_HEADER_TYPE_MASK, hdr_type);
+	dev->multifunction = FIELD_GET(PCI_HEADER_TYPE_MFD, hdr_type);
 	dev->error_state = pci_channel_io_normal;
 	set_pcie_port_type(dev);
 
···
 	struct device_node *np;
 
 	np = of_pci_find_child_device(dev_of_node(&bus->dev), devfn);
-	if (!np || of_find_device_by_node(np))
+	if (!np)
 		return NULL;
+
+	pdev = of_find_device_by_node(np);
+	if (pdev) {
+		put_device(&pdev->dev);
+		goto err_put_of_node;
+	}
 
 	/*
 	 * First check whether the pwrctrl device really needs to be created or
···
 	 */
 	if (!of_pci_supply_present(np)) {
 		pr_debug("PCI/pwrctrl: Skipping OF node: %s\n", np->name);
-		return NULL;
+		goto err_put_of_node;
 	}
 
 	/* Now create the pwrctrl device */
 	pdev = of_platform_device_create(np, NULL, &host->dev);
 	if (!pdev) {
 		pr_err("PCI/pwrctrl: Failed to create pwrctrl device for node: %s\n", np->name);
-		return NULL;
+		goto err_put_of_node;
 	}
 
+	of_node_put(np);
+
 	return pdev;
+
+err_put_of_node:
+	of_node_put(np);
+
+	return NULL;
 }
 #else
 static struct platform_device *pci_pwrctrl_create_device(struct pci_bus *bus, int devfn)
···
 {
 	unsigned int used_buses, normal_bridges = 0, hotplug_bridges = 0;
 	unsigned int start = bus->busn_res.start;
-	unsigned int devfn, cmax, max = start;
+	unsigned int devnr, cmax, max = start;
 	struct pci_dev *dev;
 
 	dev_dbg(&bus->dev, "scanning bus\n");
 
 	/* Go find them, Rover! */
-	for (devfn = 0; devfn < 256; devfn += 8)
-		pci_scan_slot(bus, devfn);
+	for (devnr = 0; devnr < PCI_MAX_NR_DEVS; devnr++)
+		pci_scan_slot(bus, PCI_DEVFN(devnr, 0));
 
 	/* Reserve buses for SR-IOV capability */
 	used_buses = pci_iov_bus_range(bus);
···
  * pci_rescan_bus(), pci_rescan_bus_bridge_resize() and PCI device removal
  * routines should always be executed under this mutex.
  */
-static DEFINE_MUTEX(pci_rescan_remove_lock);
+DEFINE_MUTEX(pci_rescan_remove_lock);
 
 void pci_lock_rescan_remove(void)
 {

drivers/pci/pwrctrl/slot.c

···
 	ret = regulator_bulk_enable(slot->num_supplies, slot->supplies);
 	if (ret < 0) {
 		dev_err_probe(dev, ret, "Failed to enable slot regulators\n");
-		goto err_regulator_free;
+		regulator_bulk_free(slot->num_supplies, slot->supplies);
+		return ret;
 	}
 
 	ret = devm_add_action_or_reset(dev, devm_pci_pwrctrl_slot_power_off,
 				       slot);
 	if (ret)
-		goto err_regulator_disable;
+		return ret;
 
 	clk = devm_clk_get_optional_enabled(dev, NULL);
 	if (IS_ERR(clk)) {
···
 		return dev_err_probe(dev, ret, "Failed to register pwrctrl driver\n");
 
 	return 0;
-
-err_regulator_disable:
-	regulator_bulk_disable(slot->num_supplies, slot->supplies);
-err_regulator_free:
-	regulator_bulk_free(slot->num_supplies, slot->supplies);
-
-	return ret;
 }
 
 static const struct of_device_id pci_pwrctrl_slot_of_match[] = {

drivers/pci/quirks.c

···
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8131_BRIDGE, quirk_disable_msi);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, 0xa238, quirk_disable_msi);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x5a3f, quirk_disable_msi);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_RDC, 0x1031, quirk_disable_msi);
 
 /*
  * The APC bridge device in AMD 780 family northbridges has some random

drivers/pci/remove.c

···
 		return;
 
 	of_device_unregister(pdev);
+	put_device(&pdev->dev);
+
 	of_node_clear_flag(np, OF_POPULATED);
 }
 
···
  */
 void pci_stop_and_remove_bus_device(struct pci_dev *dev)
 {
+	lockdep_assert_held(&pci_rescan_remove_lock);
 	pci_stop_bus_device(dev);
 	pci_remove_bus_device(dev);
 }

drivers/pci/setup-bus.c

···
 #include <linux/acpi.h>
 #include "pci.h"
 
+#define PCI_RES_TYPE_MASK \
+	(IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH |\
+	 IORESOURCE_MEM_64)
+
 unsigned int pci_flags;
 EXPORT_SYMBOL_GPL(pci_flags);
 
···
 	res->flags = dev_res->flags;
 }
 
+/*
+ * Helper function for sizing routines.  Assigned resources have non-NULL
+ * parent resource.
+ *
+ * Return first unassigned resource of the correct type.  If there is none,
+ * return first assigned resource of the correct type.  If none of the
+ * above, return NULL.
+ *
+ * Returning an assigned resource of the correct type allows the caller to
+ * distinguish between already assigned and no resource of the correct type.
+ */
+static struct resource *find_bus_resource_of_type(struct pci_bus *bus,
+						  unsigned long type_mask,
+						  unsigned long type)
+{
+	struct resource *r, *r_assigned = NULL;
+
+	pci_bus_for_each_resource(bus, r) {
+		if (!r || r == &ioport_resource || r == &iomem_resource)
+			continue;
+
+		if ((r->flags & type_mask) != type)
+			continue;
+
+		if (!r->parent)
+			return r;
+		if (!r_assigned)
+			r_assigned = r;
+	}
+	return r_assigned;
+}
+
+/**
+ * pbus_select_window_for_type - Select bridge window for a resource type
+ * @bus: PCI bus
+ * @type: Resource type (resource flags can be passed as is)
+ *
+ * Select the bridge window based on a resource @type.
+ *
+ * For memory resources, the selection is done as follows:
+ *
+ * Any non-prefetchable resource is put into the non-prefetchable window.
+ *
+ * If there is no prefetchable MMIO window, put all memory resources into the
+ * non-prefetchable window.
+ *
+ * If there's a 64-bit prefetchable MMIO window, put all 64-bit prefetchable
+ * resources into it and place 32-bit prefetchable memory into the
+ * non-prefetchable window.
+ *
+ * Otherwise, put all prefetchable resources into the prefetchable window.
+ *
+ * Return: the bridge window resource or NULL if no bridge window is found.
+ */
+static struct resource *pbus_select_window_for_type(struct pci_bus *bus,
+						    unsigned long type)
+{
+	int iores_type = type & IORESOURCE_TYPE_BITS;	/* w/o 64bit & pref */
+	struct resource *mmio, *mmio_pref, *win;
+
+	type &= PCI_RES_TYPE_MASK;			/* with 64bit & pref */
+
+	if ((iores_type != IORESOURCE_IO) && (iores_type != IORESOURCE_MEM))
+		return NULL;
+
+	if (pci_is_root_bus(bus)) {
+		win = find_bus_resource_of_type(bus, type, type);
+		if (win)
+			return win;
+
+		type &= ~IORESOURCE_MEM_64;
+		win = find_bus_resource_of_type(bus, type, type);
+		if (win)
+			return win;
+
+		type &= ~IORESOURCE_PREFETCH;
+		return find_bus_resource_of_type(bus, type, type);
+	}
+
+	switch (iores_type) {
+	case IORESOURCE_IO:
+		return pci_bus_resource_n(bus, PCI_BUS_BRIDGE_IO_WINDOW);
+
+	case IORESOURCE_MEM:
+		mmio = pci_bus_resource_n(bus, PCI_BUS_BRIDGE_MEM_WINDOW);
+		mmio_pref = pci_bus_resource_n(bus, PCI_BUS_BRIDGE_PREF_MEM_WINDOW);
+
+		if (!(type & IORESOURCE_PREFETCH) ||
+		    !(mmio_pref->flags & IORESOURCE_MEM))
+			return mmio;
+
+		if ((type & IORESOURCE_MEM_64) ||
+		    !(mmio_pref->flags & IORESOURCE_MEM_64))
+			return mmio_pref;
+
+		return mmio;
+	default:
+		return NULL;
+	}
+}
+
+/**
+ * pbus_select_window - Select bridge window for a resource
+ * @bus: PCI bus
+ * @res: Resource
+ *
+ * Select the bridge window for @res. If the resource is already assigned,
+ * return the current bridge window.
+ *
+ * For memory resources, the selection is done as follows:
+ *
+ * Any non-prefetchable resource is put into the non-prefetchable window.
+ *
+ * If there is no prefetchable MMIO window, put all memory resources into the
+ * non-prefetchable window.
+ *
+ * If there's a 64-bit prefetchable MMIO window, put all 64-bit prefetchable
+ * resources into it and place 32-bit prefetchable memory into the
+ * non-prefetchable window.
+ *
+ * Otherwise, put all prefetchable resources into the prefetchable window.
+ *
+ * Return: the bridge window resource or NULL if no bridge window is found.
+ */
+struct resource *pbus_select_window(struct pci_bus *bus,
+				    const struct resource *res)
+{
+	if (res->parent)
+		return res->parent;
+
+	return pbus_select_window_for_type(bus, res->flags);
+}
+
 static bool pdev_resources_assignable(struct pci_dev *dev)
 {
 	u16 class = dev->class >> 8, command;
···
 	return true;
 }
 
+static bool pdev_resource_assignable(struct pci_dev *dev, struct resource *res)
+{
+	int idx = pci_resource_num(dev, res);
+
+	if (!res->flags)
+		return false;
+
+	if (idx >= PCI_BRIDGE_RESOURCES && idx <= PCI_BRIDGE_RESOURCE_END &&
+	    res->flags & IORESOURCE_DISABLED)
+		return false;
+
+	return true;
+}
+
+static bool pdev_resource_should_fit(struct pci_dev *dev, struct resource *res)
+{
+	if (res->parent)
+		return false;
+
+	if (res->flags & IORESOURCE_PCI_FIXED)
+		return false;
+
+	return pdev_resource_assignable(dev, res);
+}
+
 /* Sort resources by alignment */
 static void pdev_sort_resources(struct pci_dev *dev, struct list_head *head)
 {
···
 		resource_size_t r_align;
 		struct list_head *n;
 
-		if (r->flags & IORESOURCE_PCI_FIXED)
-			continue;
-
-		if (!(r->flags) || r->parent)
+		if (!pdev_resource_should_fit(dev, r))
 			continue;
 
 		r_align = pci_resource_alignment(dev, r);
···
 	return false;
 }
 
-static inline void reset_resource(struct resource *res)
+static inline void reset_resource(struct pci_dev *dev, struct resource *res)
 {
+	int idx = pci_resource_num(dev, res);
+
+	if (idx >= PCI_BRIDGE_RESOURCES && idx <= PCI_BRIDGE_RESOURCE_END) {
+		res->flags |= IORESOURCE_UNSET;
+		return;
+	}
+
 	res->start = 0;
 	res->end = 0;
 	res->flags = 0;
···
 }
 
 /* Return: @true if assignment of a required resource failed. */
-static bool pci_required_resource_failed(struct list_head *fail_head)
+static bool pci_required_resource_failed(struct list_head *fail_head,
+					 unsigned long type)
 {
 	struct pci_dev_resource *fail_res;
 
+	type &= PCI_RES_TYPE_MASK;
+
 	list_for_each_entry(fail_res, fail_head, list) {
 		int idx = pci_resource_num(fail_res->dev, fail_res->res);
+
+		if (type && (fail_res->flags & PCI_RES_TYPE_MASK) != type)
+			continue;
 
 		if (!pci_resource_is_optional(fail_res->dev, idx))
 			return true;
···
 	struct pci_dev_resource *dev_res, *tmp_res, *dev_res2;
 	struct resource *res;
 	struct pci_dev *dev;
-	const char *res_name;
-	int idx;
 	unsigned long fail_type;
 	resource_size_t add_align, align;
 
···
 	}
 
 	/* Without realloc_head and only optional fails, nothing more to do. */
-	if (!pci_required_resource_failed(&local_fail_head) &&
+	if (!pci_required_resource_failed(&local_fail_head, 0) &&
 	    list_empty(realloc_head)) {
 		list_for_each_entry(save_res, &save_head, list) {
 			struct resource *res = save_res->res;
···
 		res = dev_res->res;
 		dev = dev_res->dev;
 
-		if (!res->parent)
-			continue;
-
-		idx = pci_resource_num(dev, res);
-		res_name = pci_resource_name(dev, idx);
-		pci_dbg(dev, "%s %pR: releasing\n", res_name, res);
-
-		release_resource(res);
+		pci_release_resource(dev, pci_resource_num(dev, res));
 		restore_dev_resource(dev_res);
 	}
 	/* Restore start/end/flags from saved list */
···
 				    0 /* don't care */);
 		}
 
-		reset_resource(res);
+		reset_resource(dev, res);
 	}
 
 	free_list(head);
···
 
 	res = bus->resource[0];
 	pcibios_resource_to_bus(bridge->bus, &region, res);
-	if (res->flags & IORESOURCE_IO) {
+	if (res->parent && res->flags & IORESOURCE_IO) {
 		/*
 		 * The IO resource is allocated a range twice as large as it
 		 * would normally need.  This allows us to set both IO regs.
···
 
 	res = bus->resource[1];
 	pcibios_resource_to_bus(bridge->bus, &region, res);
-	if (res->flags & IORESOURCE_IO) {
+	if (res->parent && res->flags & IORESOURCE_IO) {
 		pci_info(bridge, "  bridge window %pR\n", res);
 		pci_write_config_dword(bridge, PCI_CB_IO_BASE_1,
 					region.start);
···
 
 	res = bus->resource[2];
 	pcibios_resource_to_bus(bridge->bus, &region, res);
-	if (res->flags & IORESOURCE_MEM) {
+	if (res->parent && res->flags & IORESOURCE_MEM) {
 		pci_info(bridge, "  bridge window %pR\n", res);
 		pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_0,
 					region.start);
···
 
 	res = bus->resource[3];
 	pcibios_resource_to_bus(bridge->bus, &region, res);
-	if (res->flags & IORESOURCE_MEM) {
+	if (res->parent && res->flags & IORESOURCE_MEM) {
 		pci_info(bridge, "  bridge window %pR\n", res);
 		pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_1,
 					region.start);
···
 	res = &bridge->resource[PCI_BRIDGE_IO_WINDOW];
 	res_name = pci_resource_name(bridge, PCI_BRIDGE_IO_WINDOW);
 	pcibios_resource_to_bus(bridge->bus, &region, res);
-	if (res->flags & IORESOURCE_IO) {
+	if (res->parent && res->flags & IORESOURCE_IO) {
 		pci_read_config_word(bridge, PCI_IO_BASE, &l);
 		io_base_lo = (region.start >> 8) & io_mask;
 		io_limit_lo = (region.end >> 8) & io_mask;
···
 	res = &bridge->resource[PCI_BRIDGE_MEM_WINDOW];
 	res_name = pci_resource_name(bridge, PCI_BRIDGE_MEM_WINDOW);
 	pcibios_resource_to_bus(bridge->bus, &region, res);
-	if (res->flags & IORESOURCE_MEM) {
+	if (res->parent && res->flags & IORESOURCE_MEM) {
 		l = (region.start >> 16) & 0xfff0;
 		l |= region.end & 0xfff00000;
 		pci_info(bridge, "  %s %pR\n", res_name, res);
···
 	res = &bridge->resource[PCI_BRIDGE_PREF_MEM_WINDOW];
 	res_name = pci_resource_name(bridge, PCI_BRIDGE_PREF_MEM_WINDOW);
 	pcibios_resource_to_bus(bridge->bus, &region, res);
-	if (res->flags & IORESOURCE_PREFETCH) {
+	if (res->parent && res->flags & IORESOURCE_PREFETCH) {
 		l = (region.start >> 16) & 0xfff0;
 		l |= region.end & 0xfff00000;
 		if (res->flags & IORESOURCE_MEM_64) {
···
 	pci_write_config_word(bridge, PCI_BRIDGE_CONTROL, bus->bridge_ctl);
 }
 
+static void pci_setup_one_bridge_window(struct pci_dev *bridge, int resno)
+{
+	switch (resno) {
+	case PCI_BRIDGE_IO_WINDOW:
+		pci_setup_bridge_io(bridge);
+		break;
+	case PCI_BRIDGE_MEM_WINDOW:
+		pci_setup_bridge_mmio(bridge);
+		break;
+	case PCI_BRIDGE_PREF_MEM_WINDOW:
+		pci_setup_bridge_mmio_pref(bridge);
+		break;
+	default:
+		return;
+	}
+}
+
 void __weak pcibios_setup_bridge(struct pci_bus *bus, unsigned long type)
 {
 }
···
 
 int pci_claim_bridge_resource(struct pci_dev *bridge, int i)
 {
+	int ret = -EINVAL;
+
 	if (i < PCI_BRIDGE_RESOURCES || i > PCI_BRIDGE_RESOURCE_END)
 		return 0;
 
···
 	if ((bridge->class >> 8) != PCI_CLASS_BRIDGE_PCI)
 		return 0;
 
-	if (!pci_bus_clip_resource(bridge, i))
-		return -EINVAL;	/* Clipping didn't change anything */
-
-	switch (i) {
-	case PCI_BRIDGE_IO_WINDOW:
-		pci_setup_bridge_io(bridge);
-		break;
-	case PCI_BRIDGE_MEM_WINDOW:
-		pci_setup_bridge_mmio(bridge);
-		break;
-	case PCI_BRIDGE_PREF_MEM_WINDOW:
-		pci_setup_bridge_mmio_pref(bridge);
-		break;
-	default:
+	if (i > PCI_BRIDGE_PREF_MEM_WINDOW)
 		return -EINVAL;
-	}
 
-	if (pci_claim_resource(bridge, i) == 0)
-		return 0;	/* Claimed a smaller window */
+	/* Try to clip the resource and claim the smaller window */
+	if (pci_bus_clip_resource(bridge, i))
+		ret = pci_claim_resource(bridge, i);
 
-	return -EINVAL;
+	pci_setup_one_bridge_window(bridge, i);
+
+	return ret;
 }
 
 /*
···
 					PCI_PREF_RANGE_TYPE_64;
 		}
 	}
-}
-
-/*
- * Helper function for sizing routines.  Assigned resources have non-NULL
- * parent resource.
- *
- * Return first unassigned resource of the correct type.  If there is none,
- * return first assigned resource of the correct type.  If none of the
- * above, return NULL.
- *
- * Returning an assigned resource of the correct type allows the caller to
- * distinguish between already assigned and no resource of the correct type.
- */
-static struct resource *find_bus_resource_of_type(struct pci_bus *bus,
-						  unsigned long type_mask,
-						  unsigned long type)
-{
-	struct resource *r, *r_assigned = NULL;
-
-	pci_bus_for_each_resource(bus, r) {
-		if (r == &ioport_resource || r == &iomem_resource)
-			continue;
-		if (r && (r->flags & type_mask) == type && !r->parent)
-			return r;
-		if (r && (r->flags & type_mask) == type && !r_assigned)
-			r_assigned = r;
-	}
-	return r_assigned;
 }
 
 static resource_size_t calculate_iosize(resource_size_t size,
···
 			 struct list_head *realloc_head)
 {
 	struct pci_dev *dev;
-	struct resource *b_res = find_bus_resource_of_type(bus, IORESOURCE_IO,
-							   IORESOURCE_IO);
+	struct resource *b_res = pbus_select_window_for_type(bus, IORESOURCE_IO);
 	resource_size_t size = 0, size0 = 0, size1 = 0;
 	resource_size_t children_add_size = 0;
 	resource_size_t min_align, align;
···
 
 			if (r->parent || !(r->flags & IORESOURCE_IO))
 				continue;
-			r_size = resource_size(r);
 
+			if (!pdev_resource_assignable(dev, r))
+				continue;
+
+			r_size = resource_size(r);
 			if (r_size < SZ_1K)
 				/* Might be re-aligned for ISA */
 				size += r_size;
···
 	size0 = calculate_iosize(size, min_size, size1, 0, 0,
 			resource_size(b_res), min_align);
 
+	if (size0)
+		b_res->flags &= ~IORESOURCE_DISABLED;
+
 	size1 = size0;
 	if (realloc_head && (add_size > 0 || children_add_size > 0)) {
 		size1 = calculate_iosize(size, min_size, size1, add_size,
···
 		if (bus->self && (b_res->start || b_res->end))
 			pci_info(bus->self, "disabling bridge window %pR to %pR (unused)\n",
 				 b_res, &bus->busn_res);
-		b_res->flags = 0;
+		b_res->flags |= IORESOURCE_DISABLED;
 		return;
 	}
 
 	resource_set_range(b_res, min_align, size0);
 	b_res->flags |= IORESOURCE_STARTALIGN;
 	if (bus->self && size1 > size0 && realloc_head) {
+		b_res->flags &= ~IORESOURCE_DISABLED;
 		add_to_list(realloc_head, bus->self, b_res, size1-size0,
 			    min_align);
 		pci_info(bus->self, "bridge window %pR to %pR add_size %llx\n",
···
 /**
  * pbus_upstream_space_available - Check no upstream resource limits allocation
  * @bus:	The bus
- * @mask:	Mask the resource flag, then compare it with type
- * @type:	The type of resource from bridge
+ * @res:	The resource to help select the correct bridge window
  * @size:	The size required from the bridge window
  * @align:	Required alignment for the resource
  *
- * Checks that @size can fit inside the upstream bridge resources that are
- * already assigned.
+ * Check that @size can fit inside the upstream bridge resources that are
+ * already assigned. Select the upstream bridge window based on the type of
+ * @res.
  *
  * Return: %true if enough space is available on all assigned upstream
  * resources.
  */
-static bool pbus_upstream_space_available(struct pci_bus *bus, unsigned long mask,
-					  unsigned long type, resource_size_t size,
+static bool pbus_upstream_space_available(struct pci_bus *bus,
+					  struct resource *res,
+					  resource_size_t size,
 					  resource_size_t align)
 {
 	struct resource_constraint constraint = {
···
 		.align = align,
 	};
 	struct pci_bus *downstream = bus;
-	struct resource *r;
 
 	while ((bus = bus->parent)) {
 		if (pci_is_root_bus(bus))
 			break;
 
-		pci_bus_for_each_resource(bus, r) {
-			if (!r || !r->parent || (r->flags & mask) != type)
-				continue;
-
-			if (resource_size(r) >= size) {
-				struct resource gap = {};
-
-				if (find_resource_space(r, &gap, size, &constraint) == 0) {
-					gap.flags = type;
-					pci_dbg(bus->self,
-						"Assigned bridge window %pR to %pR free space at %pR\n",
-						r, &bus->busn_res, &gap);
-					return true;
-				}
-			}
-
-			if (bus->self) {
-				pci_info(bus->self,
-					 "Assigned bridge window %pR to %pR cannot fit 0x%llx required for %s bridging to %pR\n",
-					 r, &bus->busn_res,
-					 (unsigned long long)size,
-					 pci_name(downstream->self),
-					 &downstream->busn_res);
-			}
-
+		res = pbus_select_window(bus, res);
+		if (!res)
 			return false;
+		if (!res->parent)
+			continue;
+
+		if (resource_size(res) >= size) {
+			struct resource gap = {};
+
+			if (find_resource_space(res, &gap, size, &constraint) == 0) {
+				gap.flags = res->flags;
+				pci_dbg(bus->self,
+					"Assigned bridge window %pR to %pR free space at %pR\n",
+					res, &bus->busn_res, &gap);
+				return true;
+			}
 		}
+
+		if (bus->self) {
+			pci_info(bus->self,
+				 "Assigned bridge window %pR to %pR cannot fit 0x%llx required for %s bridging to %pR\n",
+				 res, &bus->busn_res,
+				 (unsigned long long)size,
+				 pci_name(downstream->self),
+				 &downstream->busn_res);
+		}
+
+		return false;
 	}
 
 	return true;
···
  * pbus_size_mem() - Size the memory window of a given bus
  *
  * @bus:		The bus
- * @mask:		Mask the resource flag, then compare it with type
- * @type:		The type of free resource from bridge
- * @type2:		Second match type
- * @type3:		Third match type
+ * @type:		The type of bridge resource
  * @min_size:		The minimum memory window that must be allocated
  * @add_size:		Additional optional memory window
  * @realloc_head:	Track the additional memory window on this list
  *
- * Calculate the size of the bus and minimal alignment which guarantees
- * that all child resources fit in this size.
+ * Calculate the size of the bus resource for @type and minimal alignment
+ * which guarantees that all child resources fit in this size.
  *
- * Return -ENOSPC if there's no available bus resource of the desired
- * type.  Otherwise, set the bus resource start/end to indicate the
- * required size, add things to realloc_head (if supplied), and return 0.
+ * Set the bus resource start/end to indicate the required size if there an
+ * available unassigned bus resource of the desired @type.
+ *
+ * Add optional resource requests to the @realloc_head list if it is
+ * supplied.
  */
-static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
-			 unsigned long type, unsigned long type2,
-			 unsigned long type3, resource_size_t min_size,
+static void pbus_size_mem(struct pci_bus *bus, unsigned long type,
+			 resource_size_t min_size,
 			 resource_size_t add_size,
 			 struct list_head *realloc_head)
 {
···
 	resource_size_t min_align, win_align, align, size, size0, size1 = 0;
 	resource_size_t aligns[28]; /* Alignments from 1MB to 128TB */
 	int order, max_order;
-	struct resource *b_res = find_bus_resource_of_type(bus,
-					mask | IORESOURCE_PREFETCH, type);
+	struct resource *b_res = pbus_select_window_for_type(bus, type);
 	resource_size_t children_add_size = 0;
 	resource_size_t children_add_align = 0;
 	resource_size_t add_align = 0;
+	resource_size_t relaxed_align;
+	resource_size_t old_size;
 
 	if (!b_res)
-		return -ENOSPC;
+		return;
 
 	/* If resource is already assigned, nothing more to do */
 	if (b_res->parent)
-		return 0;
+		return;
 
 	memset(aligns, 0, sizeof(aligns));
 	max_order = 0;
···
 			const char *r_name = pci_resource_name(dev, i);
 			resource_size_t r_size;
 
-			if (r->parent || (r->flags & IORESOURCE_PCI_FIXED) ||
-			    ((r->flags & mask) != type &&
-			     (r->flags & mask) != type2 &&
-			     (r->flags & mask) != type3))
+			if (!pdev_resources_assignable(dev) ||
+			    !pdev_resource_should_fit(dev, r))
 				continue;
+			if (b_res != pbus_select_window(bus, r))
+				continue;
+
 			r_size = resource_size(r);
 
 			/* Put SRIOV requested res to the optional list */
···
 		}
 	}
 
+	old_size = resource_size(b_res);
 	win_align = window_alignment(bus, b_res->flags);
 	min_align = calculate_mem_align(aligns, max_order);
 	min_align = max(min_align, win_align);
-	size0 = calculate_memsize(size, min_size, 0, 0, resource_size(b_res), min_align);
+	size0 = calculate_memsize(size, min_size, 0, 0, old_size, min_align);
+
+	if (size0) {
+		resource_set_range(b_res, min_align, size0);
+		b_res->flags &= ~IORESOURCE_DISABLED;
+	}
 
 	if (bus->self && size0 &&
-	    !pbus_upstream_space_available(bus, mask | IORESOURCE_PREFETCH, type,
-					   size0, min_align)) {
-		min_align = 1ULL << (max_order + __ffs(SZ_1M));
-		min_align = max(min_align, win_align);
-		size0 = calculate_memsize(size, min_size, 0, 0, resource_size(b_res), win_align);
+	    !pbus_upstream_space_available(bus, b_res, size0, min_align)) {
+		relaxed_align = 1ULL << (max_order + __ffs(SZ_1M));
+		relaxed_align = max(relaxed_align, win_align);
+		min_align = min(min_align, relaxed_align);
+		size0 = calculate_memsize(size, min_size, 0, 0, old_size, win_align);
+		resource_set_range(b_res, min_align, size0);
 		pci_info(bus->self, "bridge window %pR to %pR requires relaxed alignment rules\n",
 			 b_res, &bus->busn_res);
 	}
···
 	if (realloc_head && (add_size > 0 || children_add_size > 0)) {
 		add_align = max(min_align, add_align);
 		size1 = calculate_memsize(size, min_size, add_size, children_add_size,
-					  resource_size(b_res), add_align);
+					  old_size, add_align);
 
 		if (bus->self && size1 &&
-		    !pbus_upstream_space_available(bus, mask | IORESOURCE_PREFETCH, type,
-						   size1, add_align)) {
-			min_align = 1ULL << (max_order + __ffs(SZ_1M));
-			min_align = max(min_align, win_align);
+		    !pbus_upstream_space_available(bus, b_res, size1, add_align)) {
+			relaxed_align = 1ULL << (max_order + __ffs(SZ_1M));
+			relaxed_align = max(relaxed_align, win_align);
+			min_align = min(min_align, relaxed_align);
 			size1 = calculate_memsize(size, min_size, add_size, children_add_size,
-						  resource_size(b_res), win_align);
+						  old_size, win_align);
 			pci_info(bus->self,
 				 "bridge window %pR to %pR requires relaxed alignment rules\n",
 				 b_res, &bus->busn_res);
···
 		if (bus->self && (b_res->start || b_res->end))
 			pci_info(bus->self, "disabling bridge window %pR to %pR (unused)\n",
 				 b_res, &bus->busn_res);
-		b_res->flags = 0;
-		return 0;
+		b_res->flags |= IORESOURCE_DISABLED;
+		return;
 	}
 
 	resource_set_range(b_res, min_align, size0);
 	b_res->flags |= IORESOURCE_STARTALIGN;
 	if (bus->self && size1 > size0 && realloc_head) {
+		b_res->flags &= ~IORESOURCE_DISABLED;
 		add_to_list(realloc_head, bus->self, b_res, size1-size0, add_align);
 		pci_info(bus->self, "bridge window %pR to %pR add_size %llx add_align %llx\n",
 			   b_res, &bus->busn_res,
 			   (unsigned long long) (size1 - size0),
 			   (unsigned long long) add_align);
 	}
-	return 0;
 }
 
 unsigned long pci_cardbus_resource_alignment(struct resource *res)
···
 void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head)
 {
 	struct pci_dev *dev;
-	unsigned long mask, prefmask, type2 = 0, type3 = 0;
 	resource_size_t additional_io_size = 0, additional_mmio_size = 0,
 			additional_mmio_pref_size = 0;
 	struct resource *pref;
 	struct pci_host_bridge *host;
-	int hdr_type, ret;
+	int hdr_type;
 
 	list_for_each_entry(dev, &bus->devices, bus_list) {
 		struct pci_bus *b = dev->subordinate;
···
 		pbus_size_io(bus, realloc_head ? 0 : additional_io_size,
 			     additional_io_size, realloc_head);
 
-		/*
-		 * If there's a 64-bit prefetchable MMIO window, compute
-		 * the size required to put all 64-bit prefetchable
-		 * resources in it.
-		 */
-		mask = IORESOURCE_MEM;
-		prefmask = IORESOURCE_MEM | IORESOURCE_PREFETCH;
-		if (pref && (pref->flags & IORESOURCE_MEM_64)) {
-			prefmask |= IORESOURCE_MEM_64;
-			ret = pbus_size_mem(bus, prefmask, prefmask,
-				prefmask, prefmask,
-				realloc_head ? 0 : additional_mmio_pref_size,
-				additional_mmio_pref_size, realloc_head);
-
-			/*
-			 * If successful, all non-prefetchable resources
-			 * and any 32-bit prefetchable resources will go in
-			 * the non-prefetchable window.
-			 */
-			if (ret == 0) {
-				mask = prefmask;
-				type2 = prefmask & ~IORESOURCE_MEM_64;
-				type3 = prefmask & ~IORESOURCE_PREFETCH;
-			}
+		if (pref) {
+			pbus_size_mem(bus,
+				      IORESOURCE_MEM | IORESOURCE_PREFETCH |
+				      (pref->flags & IORESOURCE_MEM_64),
+				      realloc_head ? 0 : additional_mmio_pref_size,
+				      additional_mmio_pref_size, realloc_head);
 		}
 
-		/*
-		 * If there is no 64-bit prefetchable window, compute the
-		 * size required to put all prefetchable resources in the
-		 * 32-bit prefetchable window (if there is one).
-		 */
-		if (!type2) {
-			prefmask &= ~IORESOURCE_MEM_64;
-			ret = pbus_size_mem(bus, prefmask, prefmask,
-				prefmask, prefmask,
-				realloc_head ? 0 : additional_mmio_pref_size,
-				additional_mmio_pref_size, realloc_head);
-
-			/*
-			 * If successful, only non-prefetchable resources
-			 * will go in the non-prefetchable window.
-			 */
-			if (ret == 0)
-				mask = prefmask;
-			else
-				additional_mmio_size += additional_mmio_pref_size;
-
-			type2 = type3 = IORESOURCE_MEM;
-		}
-
-		/*
-		 * Compute the size required to put everything else in the
-		 * non-prefetchable window. This includes:
-		 *
-		 *   - all non-prefetchable resources
-		 *   - 32-bit prefetchable resources if there's a 64-bit
-		 *     prefetchable window or no prefetchable window at all
-		 *   - 64-bit prefetchable resources if there's no prefetchable
-		 *     window at all
-		 *
-		 * Note that the strategy in __pci_assign_resource() must match
-		 * that used here. Specifically, we cannot put a 32-bit
-		 * prefetchable resource in a 64-bit prefetchable window.
-		 */
-		pbus_size_mem(bus, mask, IORESOURCE_MEM, type2, type3,
+		pbus_size_mem(bus, IORESOURCE_MEM,
 			      realloc_head ? 0 : additional_mmio_size,
 			      additional_mmio_size, realloc_head);
 		break;
···
 	}
 }
 
-#define PCI_RES_TYPE_MASK \
-	(IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH |\
-	 IORESOURCE_MEM_64)
-
 static void pci_bridge_release_resources(struct pci_bus *bus,
-					 unsigned long type)
+					 struct resource *b_win)
 {
 	struct pci_dev *dev = bus->self;
-	struct resource *r;
-	unsigned int old_flags;
-	struct resource *b_res;
-	int idx = 1;
+	int idx, ret;
 
-	b_res = &dev->resource[PCI_BRIDGE_RESOURCES];
-
-	/*
-	 * 1. If IO port assignment fails, release bridge IO port.
-	 * 2. If non pref MMIO assignment fails, release bridge nonpref MMIO.
-	 * 3. If 64bit pref MMIO assignment fails, and bridge pref is 64bit,
-	 *    release bridge pref MMIO.
-	 * 4. If pref MMIO assignment fails, and bridge pref is 32bit,
-	 *    release bridge pref MMIO.
-	 * 5. If pref MMIO assignment fails, and bridge pref is not
-	 *    assigned, release bridge nonpref MMIO.
-	 */
-	if (type & IORESOURCE_IO)
-		idx = 0;
-	else if (!(type & IORESOURCE_PREFETCH))
-		idx = 1;
-	else if ((type & IORESOURCE_MEM_64) &&
-		 (b_res[2].flags & IORESOURCE_MEM_64))
-		idx = 2;
-	else if (!(b_res[2].flags & IORESOURCE_MEM_64) &&
-		 (b_res[2].flags & IORESOURCE_PREFETCH))
-		idx = 2;
-	else
-		idx = 1;
-
-	r = &b_res[idx];
-
-	if (!r->parent)
+	if (!b_win->parent)
 		return;
 
-	/* If there are children, release them all */
-	release_child_resources(r);
-	if (!release_resource(r)) {
-		type = old_flags = r->flags & PCI_RES_TYPE_MASK;
-		pci_info(dev, "resource %d %pR released\n",
-			 PCI_BRIDGE_RESOURCES + idx, r);
-		/* Keep the old size */
-		resource_set_range(r, 0, resource_size(r));
-		r->flags = 0;
+	idx = pci_resource_num(dev, b_win);
 
-		/* Avoiding touch the one without PREF */
-		if (type & IORESOURCE_PREFETCH)
-			type = IORESOURCE_PREFETCH;
-		__pci_setup_bridge(bus, type);
-		/* For next child res under same bridge */
-		r->flags = old_flags;
-	}
+	/* If there are children, release them all */
+	release_child_resources(b_win);
+
+	ret = pci_release_resource(dev, idx);
+	if (ret)
+		return;
+
+	pci_setup_one_bridge_window(dev, idx);
 }
 
 enum release_type {
···
  * a larger window later.
  */
 static void pci_bus_release_bridge_resources(struct pci_bus *bus,
-					     unsigned long type,
+					     struct resource *b_win,
 					     enum release_type rel_type)
 {
 	struct pci_dev *dev;
···
 
 	list_for_each_entry(dev, &bus->devices, bus_list) {
 		struct pci_bus *b = dev->subordinate;
+		struct resource *res;
+
 		if (!b)
 			continue;
 
···
 		if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
 			continue;
 
-		if (rel_type == whole_subtree)
-			pci_bus_release_bridge_resources(b, type,
-						 whole_subtree);
+		if (rel_type != whole_subtree)
+			continue;
+
+		pci_bus_for_each_resource(b, res) {
+			if (res->parent != b_win)
+				continue;
+
+			pci_bus_release_bridge_resources(b, res, rel_type);
+		}
 	}
 
 	if (pci_is_root_bus(bus))
···
 		return;
 
 	if ((rel_type == whole_subtree) || is_leaf_bridge)
-		pci_bridge_release_resources(bus, type);
+		pci_bridge_release_resources(bus, b_win);
 }
 
 static void pci_bus_dump_res(struct pci_bus *bus)
···
 	avail->start = min(avail->start + tmp, avail->end + 1);
 }
 
-static void remove_dev_resources(struct pci_dev *dev, struct resource *io,
-				 struct resource *mmio,
-				 struct resource *mmio_pref)
+static void remove_dev_resources(struct pci_dev *dev,
+				 struct resource available[PCI_P2P_BRIDGE_RESOURCE_NUM])
 {
-	struct resource *res;
+	struct resource *res, *b_win;
+	int idx;
 
 	pci_dev_for_each_resource(dev, res) {
-		if (resource_type(res) == IORESOURCE_IO) {
-			remove_dev_resource(io, dev, res);
-		} else if (resource_type(res) == IORESOURCE_MEM) {
+		b_win = pbus_select_window(dev->bus, res);
+		if (!b_win)
+			continue;
 
-			/*
-			 * Make sure prefetchable memory is reduced from
-			 * the correct resource. Specifically we put 32-bit
-			 * prefetchable memory in non-prefetchable window
-			 * if there is a 64-bit prefetchable window.
-			 *
-			 * See comments in __pci_bus_size_bridges() for
-			 * more information.
-			 */
-			if ((res->flags & IORESOURCE_PREFETCH) &&
-			    ((res->flags & IORESOURCE_MEM_64) ==
-			     (mmio_pref->flags & IORESOURCE_MEM_64)))
-				remove_dev_resource(mmio_pref, dev, res);
-			else
-				remove_dev_resource(mmio, dev, res);
-		}
+		idx = pci_resource_num(dev->bus->self, b_win);
+		idx -= PCI_BRIDGE_RESOURCES;
+
+		remove_dev_resource(&available[idx], dev, res);
 	}
 }
 
···
  * shared with the bridges.
  */
 static void pci_bus_distribute_available_resources(struct pci_bus *bus,
-					    struct list_head *add_list,
-					    struct resource io,
-					    struct resource mmio,
-					    struct resource mmio_pref)
+		    struct list_head *add_list,
+		    struct resource available_in[PCI_P2P_BRIDGE_RESOURCE_NUM])
 {
+	struct resource available[PCI_P2P_BRIDGE_RESOURCE_NUM];
 	unsigned int normal_bridges = 0, hotplug_bridges = 0;
-	struct resource *io_res, *mmio_res, *mmio_pref_res;
 	struct pci_dev *dev, *bridge = bus->self;
-	resource_size_t io_per_b, mmio_per_b, mmio_pref_per_b, align;
+	resource_size_t per_bridge[PCI_P2P_BRIDGE_RESOURCE_NUM];
+	resource_size_t align;
+	int i;
 
-	io_res = &bridge->resource[PCI_BRIDGE_IO_WINDOW];
-	mmio_res = &bridge->resource[PCI_BRIDGE_MEM_WINDOW];
-	mmio_pref_res = &bridge->resource[PCI_BRIDGE_PREF_MEM_WINDOW];
+	for (i = 0; i < PCI_P2P_BRIDGE_RESOURCE_NUM; i++) {
+		struct resource *res = pci_bus_resource_n(bus, i);
 
-	/*
-	 * The alignment of this bridge is yet to be considered, hence it must
-	 * be done now before extending its bridge window.
-	 */
-	align = pci_resource_alignment(bridge, io_res);
-	if (!io_res->parent && align)
-		io.start = min(ALIGN(io.start, align), io.end + 1);
+		available[i] = available_in[i];
 
-	align = pci_resource_alignment(bridge, mmio_res);
-	if (!mmio_res->parent && align)
-		mmio.start = min(ALIGN(mmio.start, align), mmio.end + 1);
+		/*
+		 * The alignment of this bridge is yet to be considered,
+		 * hence it must be done now before extending its bridge
+		 * window.
+		 */
+		align = pci_resource_alignment(bridge, res);
+		if (!res->parent && align)
+			available[i].start = min(ALIGN(available[i].start, align),
+						 available[i].end + 1);
 
-	align = pci_resource_alignment(bridge, mmio_pref_res);
-	if (!mmio_pref_res->parent && align)
-		mmio_pref.start = min(ALIGN(mmio_pref.start, align),
-			mmio_pref.end + 1);
-
-	/*
-	 * Now that we have adjusted for alignment, update the bridge window
-	 * resources to fill as much remaining resource space as possible.
-	 */
-	adjust_bridge_window(bridge, io_res, add_list, resource_size(&io));
-	adjust_bridge_window(bridge, mmio_res, add_list, resource_size(&mmio));
-	adjust_bridge_window(bridge, mmio_pref_res, add_list,
-			     resource_size(&mmio_pref));
+		/*
+		 * Now that we have adjusted for alignment, update the
+		 * bridge window resources to fill as much remaining
+		 * resource space as possible.
+		 */
+		adjust_bridge_window(bridge, res, add_list,
+				     resource_size(&available[i]));
+	}
 
 	/*
 	 * Calculate how many hotplug bridges and normal bridges there
···
 	 */
 	list_for_each_entry(dev, &bus->devices, bus_list) {
 		if (!dev->is_virtfn)
-			remove_dev_resources(dev, &io, &mmio, &mmio_pref);
+			remove_dev_resources(dev, available);
 	}
 
 	/*
···
 	 * split between non-hotplug bridges. This is to allow possible
 	 * hotplug bridges below them to get the extra space as well.
 	 */
-	if (hotplug_bridges) {
-		io_per_b = div64_ul(resource_size(&io), hotplug_bridges);
-		mmio_per_b = div64_ul(resource_size(&mmio), hotplug_bridges);
-		mmio_pref_per_b = div64_ul(resource_size(&mmio_pref),
-					   hotplug_bridges);
-	} else {
-		io_per_b = div64_ul(resource_size(&io), normal_bridges);
-		mmio_per_b = div64_ul(resource_size(&mmio), normal_bridges);
-		mmio_pref_per_b = div64_ul(resource_size(&mmio_pref),
-					   normal_bridges);
+	for (i = 0; i < PCI_P2P_BRIDGE_RESOURCE_NUM; i++) {
+		per_bridge[i] = div64_ul(resource_size(&available[i]),
+					 hotplug_bridges ?: normal_bridges);
 	}
 
 	for_each_pci_bridge(dev, bus) {
···
 		if (hotplug_bridges && !dev->is_hotplug_bridge)
 			continue;
 
-		res = &dev->resource[PCI_BRIDGE_IO_WINDOW];
+		for (i = 0; i < PCI_P2P_BRIDGE_RESOURCE_NUM; i++) {
+			res = pci_bus_resource_n(bus, i);
 
-		/*
-		 * Make sure the split resource space is properly aligned
-		 * for bridge windows (align it down to avoid going above
-		 * what is available).
-		 */
-		align = pci_resource_alignment(dev, res);
-		resource_set_size(&io, ALIGN_DOWN_IF_NONZERO(io_per_b, align));
+			/*
+			 * Make sure the split resource space is properly
+			 * aligned for bridge windows (align it down to
+			 * avoid going above what is available).
+			 */
+			align = pci_resource_alignment(dev, res);
+			resource_set_size(&available[i],
+					  ALIGN_DOWN_IF_NONZERO(per_bridge[i],
+								align));
 
-		/*
-		 * The x_per_b holds the extra resource space that can be
-		 * added for each bridge but there is the minimal already
-		 * reserved as well so adjust x.start down accordingly to
-		 * cover the whole space.
-		 */
-		io.start -= resource_size(res);
+			/*
+			 * The per_bridge holds the extra resource space
+			 * that can be added for each bridge but there is
+			 * the minimal already reserved as well so adjust
+			 * x.start down accordingly to cover the whole
+			 * space.
+			 */
+			available[i].start -= resource_size(res);
+		}
 
-		res = &dev->resource[PCI_BRIDGE_MEM_WINDOW];
-		align = pci_resource_alignment(dev, res);
-		resource_set_size(&mmio,
-				  ALIGN_DOWN_IF_NONZERO(mmio_per_b,align));
-		mmio.start -= resource_size(res);
+		pci_bus_distribute_available_resources(b, add_list, available);
 
-		res = &dev->resource[PCI_BRIDGE_PREF_MEM_WINDOW];
-		align = pci_resource_alignment(dev, res);
-		resource_set_size(&mmio_pref,
-				  ALIGN_DOWN_IF_NONZERO(mmio_pref_per_b, align));
-		mmio_pref.start -= resource_size(res);
-
-		pci_bus_distribute_available_resources(b, add_list, io, mmio,
-						       mmio_pref);
-
-		io.start += io.end + 1;
-		mmio.start += mmio.end + 1;
-		mmio_pref.start += mmio_pref.end + 1;
+		for (i = 0; i < PCI_P2P_BRIDGE_RESOURCE_NUM; i++)
+			available[i].start += available[i].end + 1;
 	}
 }
 
 static void pci_bridge_distribute_available_resources(struct pci_dev *bridge,
 						      struct list_head *add_list)
 {
-	struct resource available_io, available_mmio, available_mmio_pref;
+	struct resource *res, available[PCI_P2P_BRIDGE_RESOURCE_NUM];
+	unsigned int i;
 
 	if (!bridge->is_hotplug_bridge)
 		return;
···
 	pci_dbg(bridge, "distributing available resources\n");
 
 	/* Take the initial extra resources from the hotplug port */
-	available_io = bridge->resource[PCI_BRIDGE_IO_WINDOW];
-	available_mmio = bridge->resource[PCI_BRIDGE_MEM_WINDOW];
-	available_mmio_pref = bridge->resource[PCI_BRIDGE_PREF_MEM_WINDOW];
+	for (i = 0; i < PCI_P2P_BRIDGE_RESOURCE_NUM; i++) {
+		res = pci_resource_n(bridge, PCI_BRIDGE_RESOURCES + i);
+		available[i] = *res;
+	}
 
 	pci_bus_distribute_available_resources(bridge->subordinate,
-					       add_list, available_io,
-					       available_mmio,
-					       available_mmio_pref);
+					       add_list, available);
 }
 
 static bool pci_bridge_resources_not_assigned(struct pci_dev *dev)
···
 	 * enough to contain child device resources.
 	 */
 	list_for_each_entry(fail_res, fail_head, list) {
-		pci_bus_release_bridge_resources(fail_res->dev->bus,
-						 fail_res->flags & PCI_RES_TYPE_MASK,
-						 rel_type);
+		struct pci_bus *bus = fail_res->dev->bus;
+		struct resource *b_win;
+
+		b_win = pbus_select_window_for_type(bus, fail_res->flags);
+		if (!b_win)
+			continue;
+		pci_bus_release_bridge_resources(bus, b_win, rel_type);
 	}
 
 	/* Restore size and flags */
-	list_for_each_entry(fail_res, fail_head, list) {
-		struct resource *res = fail_res->res;
-		struct pci_dev *dev = fail_res->dev;
-		int idx = pci_resource_num(dev, res);
-
+	list_for_each_entry(fail_res, fail_head, list)
 		restore_dev_resource(fail_res);
-
-		if (!pci_is_bridge(dev))
-			continue;
-
-		if (idx >= PCI_BRIDGE_RESOURCES &&
-		    idx <= PCI_BRIDGE_RESOURCE_END)
-			res->flags = 0;
-	}
 
 	free_list(fail_head);
 }
···
 }
 EXPORT_SYMBOL_GPL(pci_assign_unassigned_bridge_resources);
 
-int pci_reassign_bridge_resources(struct pci_dev *bridge, unsigned long type)
+/*
+ * Walk to the root bus, find the bridge window relevant for @res and
+ * release it when possible. If the bridge window contains assigned
+ * resources, it cannot be released.
+ */
+int pbus_reassign_bridge_resources(struct pci_bus *bus, struct resource *res)
 {
+	unsigned long type = res->flags;
 	struct pci_dev_resource *dev_res;
-	struct pci_dev *next;
+	struct pci_dev *bridge;
 	LIST_HEAD(saved);
 	LIST_HEAD(added);
 	LIST_HEAD(failed);
···
 
 	down_read(&pci_bus_sem);
 
-	/* Walk to the root hub, releasing bridge BARs when possible */
-	next = bridge;
-	do {
-		bridge = next;
-		for (i = PCI_BRIDGE_RESOURCES; i < PCI_BRIDGE_RESOURCE_END;
-		     i++) {
-			struct resource *res = &bridge->resource[i];
-			const char *res_name = pci_resource_name(bridge, i);
+	while (!pci_is_root_bus(bus)) {
+		bridge = bus->self;
+		res = pbus_select_window(bus, res);
+		if (!res)
+			break;
 
-			if ((res->flags ^ type) & PCI_RES_TYPE_MASK)
-				continue;
+		i = pci_resource_num(bridge, res);
 
-			/* Ignore BARs which are still in use */
-			if (res->child)
-				continue;
-
+		/* Ignore BARs which are still in use */
+		if (!res->child) {
 			ret = add_to_list(&saved, bridge, res, 0, 0);
 			if (ret)
 				goto cleanup;
 
-			pci_info(bridge, "%s %pR: releasing\n", res_name, res);
+			pci_release_resource(bridge, i);
+		} else {
+			const char *res_name = pci_resource_name(bridge, i);
 
-			if (res->parent)
-				release_resource(res);
-			res->start = 0;
-			res->end = 0;
-			break;
+			pci_warn(bridge,
+				 "%s %pR: was not released (still contains assigned resources)\n",
+				 res_name, res);
 		}
-		if (i == PCI_BRIDGE_RESOURCE_END)
-			break;
 
-		next = bridge->bus ? bridge->bus->self : NULL;
-	} while (next);
+		bus = bus->parent;
+	}
 
 	if (list_empty(&saved)) {
 		up_read(&pci_bus_sem);
···
 		free_list(&added);
 
 	if (!list_empty(&failed)) {
-		ret = -ENOSPC;
-		goto cleanup;
+		if (pci_required_resource_failed(&failed, type)) {
+			ret = -ENOSPC;
+			goto cleanup;
+		}
+		/* Only resources with unrelated types failed (again) */
+		free_list(&failed);
 	}
 
 	list_for_each_entry(dev_res, &saved, list) {

drivers/pci/setup-res.c

···
 
 	res->flags &= ~IORESOURCE_UNSET;
 	res->flags &= ~IORESOURCE_STARTALIGN;
+	if (resno >= PCI_BRIDGE_RESOURCES && resno <= PCI_BRIDGE_RESOURCE_END)
+		res->flags &= ~IORESOURCE_DISABLED;
+
 	pci_info(dev, "%s %pR: assigned\n", res_name, res);
 	if (resno < PCI_BRIDGE_RESOURCES)
 		pci_update_resource(dev, resno);
···
 	return 0;
 }
 
-void pci_release_resource(struct pci_dev *dev, int resno)
+int pci_release_resource(struct pci_dev *dev, int resno)
 {
 	struct resource *res = pci_resource_n(dev, resno);
 	const char *res_name = pci_resource_name(dev, resno);
+	int ret;
 
 	if (!res->parent)
-		return;
+		return 0;
 
 	pci_info(dev, "%s %pR: releasing\n", res_name, res);
 
-	release_resource(res);
+	ret = release_resource(res);
+	if (ret)
+		return ret;
 	res->end = resource_size(res) - 1;
 	res->start = 0;
 	res->flags |= IORESOURCE_UNSET;
+
+	return 0;
 }
 EXPORT_SYMBOL(pci_release_resource);
 
···
 
 	/* Check if the new config works by trying to assign everything. */
 	if (dev->bus->self) {
-		ret = pci_reassign_bridge_resources(dev->bus->self, res->flags);
+		ret = pbus_reassign_bridge_resources(dev->bus, res);
 		if (ret)
 			goto error_resize;
 	}
···
 		if (pci_resource_is_optional(dev, i))
 			continue;
 
-		if (r->flags & IORESOURCE_UNSET) {
-			pci_err(dev, "%s %pR: not assigned; can't enable device\n",
-				r_name, r);
-			return -EINVAL;
+		if (i < PCI_BRIDGE_RESOURCES) {
+			if (r->flags & IORESOURCE_UNSET) {
+				pci_err(dev, "%s %pR: not assigned; can't enable device\n",
+					r_name, r);
+				return -EINVAL;
+			}
+
+			if (!r->parent) {
+				pci_err(dev, "%s %pR: not claimed; can't enable device\n",
+					r_name, r);
+				return -EINVAL;
+			}
 		}
 
-		if (!r->parent) {
-			pci_err(dev, "%s %pR: not claimed; can't enable device\n",
-				r_name, r);
-			return -EINVAL;
+		if (r->parent) {
+			if (r->flags & IORESOURCE_IO)
+				cmd |= PCI_COMMAND_IO;
+			if (r->flags & IORESOURCE_MEM)
+				cmd |= PCI_COMMAND_MEMORY;
 		}
-
-		if (r->flags & IORESOURCE_IO)
-			cmd |= PCI_COMMAND_IO;
-		if (r->flags & IORESOURCE_MEM)
-			cmd |= PCI_COMMAND_MEMORY;
 	}
 
 	if (cmd != old_cmd) {

drivers/pci/switch/switchtec.c

···
 
 	dev_dbg(&stdev->dev, "%s\n", __func__);
 
-	mutex_lock(&stdev->mrpc_mutex);
+	guard(mutex)(&stdev->mrpc_mutex);
 	cancel_delayed_work(&stdev->mrpc_timeout);
 	mrpc_complete_cmd(stdev);
-	mutex_unlock(&stdev->mrpc_mutex);
 }
 
 static void mrpc_error_complete_cmd(struct switchtec_dev *stdev)
···
 	cancel_delayed_work_sync(&stdev->mrpc_timeout);
 
 	/* Mark the hardware as unavailable and complete all completions */
-	mutex_lock(&stdev->mrpc_mutex);
-	stdev->alive = false;
+	scoped_guard (mutex, &stdev->mrpc_mutex) {
+		stdev->alive = false;
 
-	/* Wake up and kill any users waiting on an MRPC request */
-	list_for_each_entry_safe(stuser, tmpuser, &stdev->mrpc_queue, list) {
-		stuser->cmd_done = true;
-		wake_up_interruptible(&stuser->cmd_comp);
-		list_del_init(&stuser->list);
-		stuser_put(stuser);
+		/* Wake up and kill any users waiting on an MRPC request */
+		list_for_each_entry_safe(stuser, tmpuser, &stdev->mrpc_queue, list) {
+			stuser->cmd_done = true;
+			wake_up_interruptible(&stuser->cmd_comp);
+			list_del_init(&stuser->list);
+			stuser_put(stuser);
+		}
+
 	}
-
-	mutex_unlock(&stdev->mrpc_mutex);
 
 	/* Wake up any users waiting on event_wq */
 	wake_up_interruptible(&stdev->event_wq);

drivers/pinctrl/core.c

···
 EXPORT_SYMBOL_GPL(pinctrl_pm_select_default_state);
 
 /**
+ * pinctrl_pm_select_init_state() - select init pinctrl state for PM
+ * @dev: device to select init state for
+ */
+int pinctrl_pm_select_init_state(struct device *dev)
+{
+	if (!dev->pins)
+		return 0;
+
+	return pinctrl_select_bound_state(dev, dev->pins->init_state);
+}
+EXPORT_SYMBOL_GPL(pinctrl_pm_select_init_state);
+
+/**
  * pinctrl_pm_select_sleep_state() - select sleep pinctrl state for PM
  * @dev: device to select sleep state for
  */

drivers/scsi/lpfc/lpfc_init.c

···
  * as desired.
  *
  * Return codes
- * 	PCI_ERS_RESULT_CAN_RECOVER - can be recovered with reset_link
+ *	PCI_ERS_RESULT_CAN_RECOVER - can be recovered without reset
  * 	PCI_ERS_RESULT_NEED_RESET - need to reset before recovery
  * 	PCI_ERS_RESULT_DISCONNECT - device could not be recovered
  **/

drivers/scsi/qla2xxx/qla_os.c

···
 	       "Slot Reset.\n");
 
 	ha->pci_error_state = QLA_PCI_SLOT_RESET;
-	/* Workaround: qla2xxx driver which access hardware earlier
-	 * needs error state to be pci_channel_io_online.
-	 * Otherwise mailbox command timesout.
-	 */
-	pdev->error_state = pci_channel_io_normal;
 
 	pci_restore_state(pdev);
 

include/linux/pci-p2pdma.h

···
 		u64 offset);
 int pci_p2pdma_distance_many(struct pci_dev *provider, struct device **clients,
 			     int num_clients, bool verbose);
-bool pci_has_p2pmem(struct pci_dev *pdev);
 struct pci_dev *pci_p2pmem_find_many(struct device **clients, int num_clients);
 void *pci_alloc_p2pmem(struct pci_dev *pdev, size_t size);
 void pci_free_p2pmem(struct pci_dev *pdev, void *addr, size_t size);
···
 	struct device **clients, int num_clients, bool verbose)
 {
 	return -1;
-}
-static inline bool pci_has_p2pmem(struct pci_dev *pdev)
-{
-	return false;
 }
 static inline struct pci_dev *pci_p2pmem_find_many(struct device **clients,
 						   int num_clients)

include/linux/pci.h

···
 #define PCI_CB_BRIDGE_MEM_1_WINDOW	(PCI_BRIDGE_RESOURCES + 3)
 
 /* Total number of bridge resources for P2P and CardBus */
-#define PCI_BRIDGE_RESOURCE_NUM 4
+#define PCI_P2P_BRIDGE_RESOURCE_NUM	3
+#define PCI_BRIDGE_RESOURCE_NUM		4
 
 	/* Resources assigned to buses behind the bridge */
 	PCI_BRIDGE_RESOURCES,
···
 void pcibios_reset_secondary_bus(struct pci_dev *dev);
 void pci_update_resource(struct pci_dev *dev, int resno);
 int __must_check pci_assign_resource(struct pci_dev *dev, int i);
-void pci_release_resource(struct pci_dev *dev, int resno);
+int pci_release_resource(struct pci_dev *dev, int resno);
 static inline int pci_rebar_bytes_to_size(u64 bytes)
 {
 	bytes = roundup_pow_of_two(bytes);
···
 	return false;
 }
 
-#if defined(CONFIG_PCIEPORTBUS) || defined(CONFIG_EEH)
+#if defined(CONFIG_PCIEPORTBUS) || defined(CONFIG_EEH) || defined(CONFIG_S390)
 void pci_uevent_ers(struct pci_dev *pdev, enum  pci_ers_result err_type);
 #endif
 

include/linux/pinctrl/consumer.h

···
 
 #ifdef CONFIG_PM
 int pinctrl_pm_select_default_state(struct device *dev);
+int pinctrl_pm_select_init_state(struct device *dev);
 int pinctrl_pm_select_sleep_state(struct device *dev);
 int pinctrl_pm_select_idle_state(struct device *dev);
 #else
 static inline int pinctrl_pm_select_default_state(struct device *dev)
+{
+	return 0;
+}
+static inline int pinctrl_pm_select_init_state(struct device *dev)
 {
 	return 0;
 }
···
 }
 
 static inline int pinctrl_pm_select_default_state(struct device *dev)
+{
+	return 0;
+}
+
+static inline int pinctrl_pm_select_init_state(struct device *dev)
 {
 	return 0;
 }

include/uapi/linux/pci_regs.h

···
 
 /* Capability lists */
 
+#define PCI_CAP_ID_MASK		0x00ff	/* Capability ID mask */
+#define PCI_CAP_LIST_NEXT_MASK	0xff00	/* Next Capability Pointer mask */
+
 #define PCI_CAP_LIST_ID		0	/* Capability ID */
 #define  PCI_CAP_ID_PM		0x01	/* Power Management */
 #define  PCI_CAP_ID_AGP		0x02	/* Accelerated Graphics Port */
···
 #define  PCI_ERR_UNC_MCBTLP	0x00800000	/* MC blocked TLP */
 #define  PCI_ERR_UNC_ATOMEG	0x01000000	/* Atomic egress blocked */
 #define  PCI_ERR_UNC_TLPPRE	0x02000000	/* TLP prefix blocked */
+#define  PCI_ERR_UNC_POISON_BLK	0x04000000	/* Poisoned TLP Egress Blocked */
+#define  PCI_ERR_UNC_DMWR_BLK	0x08000000	/* DMWr Request Egress Blocked */
+#define  PCI_ERR_UNC_IDE_CHECK	0x10000000	/* IDE Check Failed */
+#define  PCI_ERR_UNC_MISR_IDE	0x20000000	/* Misrouted IDE TLP */
+#define  PCI_ERR_UNC_PCRC_CHECK	0x40000000	/* PCRC Check Failed */
+#define  PCI_ERR_UNC_XLAT_BLK	0x80000000	/* TLP Translation Egress Blocked */
 #define PCI_ERR_UNCOR_MASK	0x08	/* Uncorrectable Error Mask */
 	/* Same bits as above */
 #define PCI_ERR_UNCOR_SEVER	0x0c	/* Uncorrectable Error Severity */
···
 #define  PCI_ERR_CAP_ECRC_CHKC		0x00000080 /* ECRC Check Capable */
 #define  PCI_ERR_CAP_ECRC_CHKE		0x00000100 /* ECRC Check Enable */
 #define  PCI_ERR_CAP_PREFIX_LOG_PRESENT	0x00000800 /* TLP Prefix Log Present */
+#define  PCI_ERR_CAP_COMP_TIME_LOG	0x00001000 /* Completion Timeout Prefix/Header Log Capable */
 #define  PCI_ERR_CAP_TLP_LOG_FLIT	0x00040000 /* TLP was logged in Flit Mode */
 #define  PCI_ERR_CAP_TLP_LOG_SIZE	0x00f80000 /* Logged TLP Size (only in Flit mode) */
 #define PCI_ERR_HEADER_LOG	0x1c	/* Header Log Register (16 bytes) */

tools/testing/selftests/pci_endpoint/pci_endpoint_test.c

···
 
 	for (i = 1; i <= 32; i++) {
 		pci_ep_ioctl(PCITEST_MSI, i);
+		if (ret == -EINVAL)
+			SKIP(return, "MSI%d is disabled", i);
 		EXPECT_FALSE(ret) TH_LOG("Test failed for MSI%d", i);
 	}
 }
···
 
 	for (i = 1; i <= 2048; i++) {
 		pci_ep_ioctl(PCITEST_MSIX, i);
+		if (ret == -EINVAL)
+			SKIP(return, "MSI-X%d is disabled", i);
 		EXPECT_FALSE(ret) TH_LOG("Test failed for MSI-X%d", i);
 	}
 }