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linux
ata: Fix SATA_MOBILE_LPM_POLICY description in Kconfig
Improve the description of the possible default SATA link power
management policies and add the missing description for policy 5.
No functional changes.
Fixes: a5ec5a7bfd1f ("ata: ahci: Support state with min power but Partial low power state")
Cc: stable@vger.kernel.org
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Niklas Cassel <cassel@kernel.org>
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drivers/ata/Kconfig
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-8
drivers/ata/Kconfig
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config SATA_MOBILE_LPM_POLICY
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int "Default SATA Link Power Management policy"
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range 0 4
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range 0 5
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default 3
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depends on SATA_AHCI
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help
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Select the Default SATA Link Power Management (LPM) policy to use
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for chipsets / "South Bridges" supporting low-power modes. Such
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chipsets are ubiquitous across laptops, desktops and servers.
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Each policy combines power saving states and features:
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- Partial: The Phy logic is powered but is in a reduced power
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state. The exit latency from this state is no longer than
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10us).
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- Slumber: The Phy logic is powered but is in an even lower power
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state. The exit latency from this state is potentially
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longer, but no longer than 10ms.
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- DevSleep: The Phy logic may be powered down. The exit latency from
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this state is no longer than 20 ms, unless otherwise
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specified by DETO in the device Identify Device Data log.
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- HIPM: Host Initiated Power Management (host automatically
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transitions to partial and slumber).
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- DIPM: Device Initiated Power Management (device automatically
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transitions to partial and slumber).
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The value set has the following meanings:
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The possible values for the default SATA link power management
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policies are:
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0 => Keep firmware settings
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1 => Maximum performance
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2 => Medium power
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3 => Medium power with Device Initiated PM enabled
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4 => Minimum power
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1 => No power savings (maximum performance)
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2 => HIPM (Partial)
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3 => HIPM (Partial) and DIPM (Partial and Slumber)
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4 => HIPM (Partial and DevSleep) and DIPM (Partial and Slumber)
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5 => HIPM (Slumber and DevSleep) and DIPM (Partial and Slumber)
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Note "Minimum power" is known to cause issues, including disk
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corruption, with some disks and should not be used.
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Excluding the value 0, higher values represent policies with higher
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power savings.
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config SATA_AHCI_PLATFORM
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tristate "Platform AHCI SATA support"