drm: xlnx: DRM/KMS driver for Xilinx ZynqMP DisplayPort Subsystem

The Xilinx ZynqMP SoC has a hardened display pipeline named DisplayPort
Subsystem. It includes a buffer manager, a video pipeline renderer
(blender), an audio mixer and a DisplayPort source controller
(transmitter). The DMA engine the provide data to the buffer manager, as
well as the DisplayPort PHYs that drive the lanes, are external to the
subsystem and interfaced using the DMA engine and PHY APIs respectively.

This driver supports the DisplayPort Subsystem and implements

- Two planes, for graphics and video
- One CRTC that supports alpha blending
- One encoder for the DisplayPort transmitter
- One connector for an external monitor

It currently doesn't support

- Color keying
- Test pattern generation
- Audio
- Live input from the Programmable Logic (FPGA)
- Output to the Programmable Logic (FPGA)

Signed-off-by: Hyun Kwon <[e-mail]>
Signed-off-by: Laurent Pinchart <[e-mail]>

MAINTAINERS

···
 F:	Documentation/gpu/xen-front.rst
 F:	drivers/gpu/drm/xen/
 
+DRM DRIVERS FOR XILINX
+M:	Hyun Kwon <[e-mail]>
+M:	Laurent Pinchart <[e-mail]>
+L:	[e-mail]
+S:	Maintained
+T:	git git://anongit.freedesktop.org/drm/drm-misc
+F:	Documentation/devicetree/bindings/display/xlnx/
+F:	drivers/gpu/drm/xlnx/
+
 DRM DRIVERS FOR ZTE ZX
 M:	Shawn Guo <[e-mail]>
 L:	[e-mail]

drivers/gpu/drm/Kconfig

···
 
 source "drivers/gpu/drm/tidss/Kconfig"
 
+source "drivers/gpu/drm/xlnx/Kconfig"
+
 # Keep legacy drivers last
 
 menuconfig DRM_LEGACY

drivers/gpu/drm/Makefile

···
 obj-$(CONFIG_DRM_ASPEED_GFX) += aspeed/
 obj-$(CONFIG_DRM_MCDE) += mcde/
 obj-$(CONFIG_DRM_TIDSS) += tidss/
+obj-y			+= xlnx/

drivers/gpu/drm/xlnx/Kconfig

···
+config DRM_ZYNQMP_DPSUB
+	tristate "ZynqMP DisplayPort Controller Driver"
+	depends on ARCH_ZYNQMP || COMPILE_TEST
+	depends on COMMON_CLK && DRM && OF
+	select DMA_ENGINE
+	select DRM_GEM_CMA_HELPER
+	select DRM_KMS_CMA_HELPER
+	select DRM_KMS_HELPER
+	select GENERIC_PHY
+	help
+	  This is a DRM/KMS driver for ZynqMP DisplayPort controller. Choose
+	  this option if you have a Xilinx ZynqMP SoC with DisplayPort
+	  subsystem.

drivers/gpu/drm/xlnx/Makefile

···
+zynqmp-dpsub-y := zynqmp_disp.o zynqmp_dpsub.o zynqmp_dp.o
+obj-$(CONFIG_DRM_ZYNQMP_DPSUB) += zynqmp-dpsub.o

drivers/gpu/drm/xlnx/zynqmp_disp.c

···
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ZynqMP Display Controller Driver
+ *
+ * Copyright (C) 2017 - 2020 Xilinx, Inc.
+ *
+ * Authors:
+ * - Hyun Woo Kwon <[e-mail]>
+ * - Laurent Pinchart <[e-mail]>
+ */
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_atomic_uapi.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_device.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_framebuffer.h>
+#include <drm/drm_managed.h>
+#include <drm/drm_plane.h>
+#include <drm/drm_plane_helper.h>
+#include <drm/drm_vblank.h>
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_dma.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/spinlock.h>
+
+#include "zynqmp_disp.h"
+#include "zynqmp_disp_regs.h"
+#include "zynqmp_dp.h"
+#include "zynqmp_dpsub.h"
+
+/*
+ * Overview
+ * --------
+ *
+ * The display controller part of ZynqMP DP subsystem, made of the Audio/Video
+ * Buffer Manager, the Video Rendering Pipeline (blender) and the Audio Mixer.
+ *
+ *              +------------------------------------------------------------+
+ * +--------+   | +----------------+     +-----------+                       |
+ * | DPDMA  | --->|                | --> |   Video   | Video +-------------+ |
+ * | 4x vid |   | |                |     | Rendering | -+--> |             | |   +------+
+ * | 2x aud |   | |  Audio/Video   | --> | Pipeline  |  |    | DisplayPort |---> | PHY0 |
+ * +--------+   | | Buffer Manager |     +-----------+  |    |   Source    | |   +------+
+ *              | |    and STC     |     +-----------+  |    | Controller  | |   +------+
+ * Live Video --->|                | --> |   Audio   | Audio |             |---> | PHY1 |
+ *              | |                |     |   Mixer   | --+-> |             | |   +------+
+ * Live Audio --->|                | --> |           |  ||   +-------------+ |
+ *              | +----------------+     +-----------+  ||                   |
+ *              +---------------------------------------||-------------------+
+ *                                                      vv
+ *                                                Blended Video and
+ *                                                Mixed Audio to PL
+ *
+ * Only non-live input from the DPDMA and output to the DisplayPort Source
+ * Controller are currently supported. Interface with the programmable logic
+ * for live streams is not implemented.
+ *
+ * The display controller code creates planes for the DPDMA video and graphics
+ * layers, and a CRTC for the Video Rendering Pipeline.
+ */
+
+#define ZYNQMP_DISP_AV_BUF_NUM_VID_GFX_BUFFERS		4
+#define ZYNQMP_DISP_AV_BUF_NUM_BUFFERS			6
+
+#define ZYNQMP_DISP_NUM_LAYERS				2
+#define ZYNQMP_DISP_MAX_NUM_SUB_PLANES			3
+
+/**
+ * struct zynqmp_disp_format - Display subsystem format information
+ * @drm_fmt: DRM format (4CC)
+ * @buf_fmt: AV buffer format
+ * @bus_fmt: Media bus formats (live formats)
+ * @swap: Flag to swap R & B for RGB formats, and U & V for YUV formats
+ * @sf: Scaling factors for color components
+ */
+struct zynqmp_disp_format {
+	u32 drm_fmt;
+	u32 buf_fmt;
+	u32 bus_fmt;
+	bool swap;
+	const u32 *sf;
+};
+
+/**
+ * enum zynqmp_disp_id - Layer identifier
+ * @ZYNQMP_DISP_LAYER_VID: Video layer
+ * @ZYNQMP_DISP_LAYER_GFX: Graphics layer
+ */
+enum zynqmp_disp_layer_id {
+	ZYNQMP_DISP_LAYER_VID,
+	ZYNQMP_DISP_LAYER_GFX
+};
+
+/**
+ * enum zynqmp_disp_layer_mode - Layer mode
+ * @ZYNQMP_DISP_LAYER_NONLIVE: non-live (memory) mode
+ * @ZYNQMP_DISP_LAYER_LIVE: live (stream) mode
+ */
+enum zynqmp_disp_layer_mode {
+	ZYNQMP_DISP_LAYER_NONLIVE,
+	ZYNQMP_DISP_LAYER_LIVE
+};
+
+/**
+ * struct zynqmp_disp_layer_dma - DMA channel for one data plane of a layer
+ * @chan: DMA channel
+ * @xt: Interleaved DMA descriptor template
+ * @sgl: Data chunk for dma_interleaved_template
+ */
+struct zynqmp_disp_layer_dma {
+	struct dma_chan *chan;
+	struct dma_interleaved_template xt;
+	struct data_chunk sgl;
+};
+
+/**
+ * struct zynqmp_disp_layer_info - Static layer information
+ * @formats: Array of supported formats
+ * @num_formats: Number of formats in @formats array
+ * @num_channels: Number of DMA channels
+ */
+struct zynqmp_disp_layer_info {
+	const struct zynqmp_disp_format *formats;
+	unsigned int num_formats;
+	unsigned int num_channels;
+};
+
+/**
+ * struct zynqmp_disp_layer - Display layer (DRM plane)
+ * @plane: DRM plane
+ * @id: Layer ID
+ * @disp: Back pointer to struct zynqmp_disp
+ * @info: Static layer information
+ * @dmas: DMA channels
+ * @disp_fmt: Current format information
+ * @drm_fmt: Current DRM format information
+ * @mode: Current operation mode
+ */
+struct zynqmp_disp_layer {
+	struct drm_plane plane;
+	enum zynqmp_disp_layer_id id;
+	struct zynqmp_disp *disp;
+	const struct zynqmp_disp_layer_info *info;
+
+	struct zynqmp_disp_layer_dma dmas[ZYNQMP_DISP_MAX_NUM_SUB_PLANES];
+
+	const struct zynqmp_disp_format *disp_fmt;
+	const struct drm_format_info *drm_fmt;
+	enum zynqmp_disp_layer_mode mode;
+};
+
+/**
+ * struct zynqmp_disp_blend - Blender
+ * @base: Registers I/O base address
+ */
+struct zynqmp_disp_blend {
+	void __iomem *base;
+};
+
+/**
+ * struct zynqmp_disp_avbuf - Audio/video buffer manager
+ * @base: Registers I/O base address
+ */
+struct zynqmp_disp_avbuf {
+	void __iomem *base;
+};
+
+/**
+ * struct zynqmp_disp_audio - Audio mixer
+ * @base: Registers I/O base address
+ * @clk: Audio clock
+ * @clk_from_ps: True of the audio clock comes from PS, false from PL
+ */
+struct zynqmp_disp_audio {
+	void __iomem *base;
+	struct clk *clk;
+	bool clk_from_ps;
+};
+
+/**
+ * struct zynqmp_disp - Display controller
+ * @dev: Device structure
+ * @drm: DRM core
+ * @dpsub: Display subsystem
+ * @crtc: DRM CRTC
+ * @blend: Blender (video rendering pipeline)
+ * @avbuf: Audio/video buffer manager
+ * @audio: Audio mixer
+ * @layers: Layers (planes)
+ * @event: Pending vblank event request
+ * @pclk: Pixel clock
+ * @pclk_from_ps: True of the video clock comes from PS, false from PL
+ */
+struct zynqmp_disp {
+	struct device *dev;
+	struct drm_device *drm;
+	struct zynqmp_dpsub *dpsub;
+
+	struct drm_crtc crtc;
+
+	struct zynqmp_disp_blend blend;
+	struct zynqmp_disp_avbuf avbuf;
+	struct zynqmp_disp_audio audio;
+
+	struct zynqmp_disp_layer layers[ZYNQMP_DISP_NUM_LAYERS];
+
+	struct drm_pending_vblank_event *event;
+
+	struct clk *pclk;
+	bool pclk_from_ps;
+};
+
+/* -----------------------------------------------------------------------------
+ * Audio/Video Buffer Manager
+ */
+
+static const u32 scaling_factors_444[] = {
+	ZYNQMP_DISP_AV_BUF_4BIT_SF,
+	ZYNQMP_DISP_AV_BUF_4BIT_SF,
+	ZYNQMP_DISP_AV_BUF_4BIT_SF,
+};
+
+static const u32 scaling_factors_555[] = {
+	ZYNQMP_DISP_AV_BUF_5BIT_SF,
+	ZYNQMP_DISP_AV_BUF_5BIT_SF,
+	ZYNQMP_DISP_AV_BUF_5BIT_SF,
+};
+
+static const u32 scaling_factors_565[] = {
+	ZYNQMP_DISP_AV_BUF_5BIT_SF,
+	ZYNQMP_DISP_AV_BUF_6BIT_SF,
+	ZYNQMP_DISP_AV_BUF_5BIT_SF,
+};
+
+static const u32 scaling_factors_666[] = {
+	ZYNQMP_DISP_AV_BUF_6BIT_SF,
+	ZYNQMP_DISP_AV_BUF_6BIT_SF,
+	ZYNQMP_DISP_AV_BUF_6BIT_SF,
+};
+
+static const u32 scaling_factors_888[] = {
+	ZYNQMP_DISP_AV_BUF_8BIT_SF,
+	ZYNQMP_DISP_AV_BUF_8BIT_SF,
+	ZYNQMP_DISP_AV_BUF_8BIT_SF,
+};
+
+static const u32 scaling_factors_101010[] = {
+	ZYNQMP_DISP_AV_BUF_10BIT_SF,
+	ZYNQMP_DISP_AV_BUF_10BIT_SF,
+	ZYNQMP_DISP_AV_BUF_10BIT_SF,
+};
+
+/* List of video layer formats */
+static const struct zynqmp_disp_format avbuf_vid_fmts[] = {
+	{
+		.drm_fmt	= DRM_FORMAT_VYUY,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_VID_VYUY,
+		.swap		= true,
+		.sf		= scaling_factors_888,
+	}, {
+		.drm_fmt	= DRM_FORMAT_UYVY,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_VID_VYUY,
+		.swap		= false,
+		.sf		= scaling_factors_888,
+	}, {
+		.drm_fmt	= DRM_FORMAT_YUYV,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YUYV,
+		.swap		= false,
+		.sf		= scaling_factors_888,
+	}, {
+		.drm_fmt	= DRM_FORMAT_YVYU,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YUYV,
+		.swap		= true,
+		.sf		= scaling_factors_888,
+	}, {
+		.drm_fmt	= DRM_FORMAT_YUV422,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YV16,
+		.swap		= false,
+		.sf		= scaling_factors_888,
+	}, {
+		.drm_fmt	= DRM_FORMAT_YVU422,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YV16,
+		.swap		= true,
+		.sf		= scaling_factors_888,
+	}, {
+		.drm_fmt	= DRM_FORMAT_YUV444,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YV24,
+		.swap		= false,
+		.sf		= scaling_factors_888,
+	}, {
+		.drm_fmt	= DRM_FORMAT_YVU444,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YV24,
+		.swap		= true,
+		.sf		= scaling_factors_888,
+	}, {
+		.drm_fmt	= DRM_FORMAT_NV16,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YV16CI,
+		.swap		= false,
+		.sf		= scaling_factors_888,
+	}, {
+		.drm_fmt	= DRM_FORMAT_NV61,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YV16CI,
+		.swap		= true,
+		.sf		= scaling_factors_888,
+	}, {
+		.drm_fmt	= DRM_FORMAT_BGR888,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_VID_RGB888,
+		.swap		= false,
+		.sf		= scaling_factors_888,
+	}, {
+		.drm_fmt	= DRM_FORMAT_RGB888,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_VID_RGB888,
+		.swap		= true,
+		.sf		= scaling_factors_888,
+	}, {
+		.drm_fmt	= DRM_FORMAT_XBGR8888,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_VID_RGBA8880,
+		.swap		= false,
+		.sf		= scaling_factors_888,
+	}, {
+		.drm_fmt	= DRM_FORMAT_XRGB8888,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_VID_RGBA8880,
+		.swap		= true,
+		.sf		= scaling_factors_888,
+	}, {
+		.drm_fmt	= DRM_FORMAT_XBGR2101010,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_VID_RGB888_10,
+		.swap		= false,
+		.sf		= scaling_factors_101010,
+	}, {
+		.drm_fmt	= DRM_FORMAT_XRGB2101010,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_VID_RGB888_10,
+		.swap		= true,
+		.sf		= scaling_factors_101010,
+	}, {
+		.drm_fmt	= DRM_FORMAT_YUV420,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YV16_420,
+		.swap		= false,
+		.sf		= scaling_factors_888,
+	}, {
+		.drm_fmt	= DRM_FORMAT_YVU420,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YV16_420,
+		.swap		= true,
+		.sf		= scaling_factors_888,
+	}, {
+		.drm_fmt	= DRM_FORMAT_NV12,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YV16CI_420,
+		.swap		= false,
+		.sf		= scaling_factors_888,
+	}, {
+		.drm_fmt	= DRM_FORMAT_NV21,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YV16CI_420,
+		.swap		= true,
+		.sf		= scaling_factors_888,
+	},
+};
+
+/* List of graphics layer formats */
+static const struct zynqmp_disp_format avbuf_gfx_fmts[] = {
+	{
+		.drm_fmt	= DRM_FORMAT_ABGR8888,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_RGBA8888,
+		.swap		= false,
+		.sf		= scaling_factors_888,
+	}, {
+		.drm_fmt	= DRM_FORMAT_ARGB8888,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_RGBA8888,
+		.swap		= true,
+		.sf		= scaling_factors_888,
+	}, {
+		.drm_fmt	= DRM_FORMAT_RGBA8888,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_ABGR8888,
+		.swap		= false,
+		.sf		= scaling_factors_888,
+	}, {
+		.drm_fmt	= DRM_FORMAT_BGRA8888,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_ABGR8888,
+		.swap		= true,
+		.sf		= scaling_factors_888,
+	}, {
+		.drm_fmt	= DRM_FORMAT_BGR888,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_RGB888,
+		.swap		= false,
+		.sf		= scaling_factors_888,
+	}, {
+		.drm_fmt	= DRM_FORMAT_RGB888,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_BGR888,
+		.swap		= false,
+		.sf		= scaling_factors_888,
+	}, {
+		.drm_fmt	= DRM_FORMAT_RGBA5551,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_RGBA5551,
+		.swap		= false,
+		.sf		= scaling_factors_555,
+	}, {
+		.drm_fmt	= DRM_FORMAT_BGRA5551,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_RGBA5551,
+		.swap		= true,
+		.sf		= scaling_factors_555,
+	}, {
+		.drm_fmt	= DRM_FORMAT_RGBA4444,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_RGBA4444,
+		.swap		= false,
+		.sf		= scaling_factors_444,
+	}, {
+		.drm_fmt	= DRM_FORMAT_BGRA4444,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_RGBA4444,
+		.swap		= true,
+		.sf		= scaling_factors_444,
+	}, {
+		.drm_fmt	= DRM_FORMAT_RGB565,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_RGB565,
+		.swap		= false,
+		.sf		= scaling_factors_565,
+	}, {
+		.drm_fmt	= DRM_FORMAT_BGR565,
+		.buf_fmt	= ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_RGB565,
+		.swap		= true,
+		.sf		= scaling_factors_565,
+	},
+};
+
+static u32 zynqmp_disp_avbuf_read(struct zynqmp_disp_avbuf *avbuf, int reg)
+{
+	return readl(avbuf->base + reg);
+}
+
+static void zynqmp_disp_avbuf_write(struct zynqmp_disp_avbuf *avbuf,
+				    int reg, u32 val)
+{
+	writel(val, avbuf->base + reg);
+}
+
+/**
+ * zynqmp_disp_avbuf_set_format - Set the input format for a layer
+ * @avbuf: Audio/video buffer manager
+ * @layer: The layer ID
+ * @fmt: The format information
+ *
+ * Set the video buffer manager format for @layer to @fmt.
+ */
+static void zynqmp_disp_avbuf_set_format(struct zynqmp_disp_avbuf *avbuf,
+					 enum zynqmp_disp_layer_id layer,
+					 const struct zynqmp_disp_format *fmt)
+{
+	unsigned int i;
+	u32 val;
+
+	val = zynqmp_disp_avbuf_read(avbuf, ZYNQMP_DISP_AV_BUF_FMT);
+	val &= layer == ZYNQMP_DISP_LAYER_VID
+	    ? ~ZYNQMP_DISP_AV_BUF_FMT_NL_VID_MASK
+	    : ~ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_MASK;
+	val |= fmt->buf_fmt;
+	zynqmp_disp_avbuf_write(avbuf, ZYNQMP_DISP_AV_BUF_FMT, val);
+
+	for (i = 0; i < ZYNQMP_DISP_AV_BUF_NUM_SF; i++) {
+		unsigned int reg = layer == ZYNQMP_DISP_LAYER_VID
+				 ? ZYNQMP_DISP_AV_BUF_VID_COMP_SF(i)
+				 : ZYNQMP_DISP_AV_BUF_GFX_COMP_SF(i);
+
+		zynqmp_disp_avbuf_write(avbuf, reg, fmt->sf[i]);
+	}
+}
+
+/**
+ * zynqmp_disp_avbuf_set_clocks_sources - Set the clocks sources
+ * @avbuf: Audio/video buffer manager
+ * @video_from_ps: True if the video clock originates from the PS
+ * @audio_from_ps: True if the audio clock originates from the PS
+ * @timings_internal: True if video timings are generated internally
+ *
+ * Set the source for the video and audio clocks, as well as for the video
+ * timings. Clocks can originate from the PS or PL, and timings can be
+ * generated internally or externally.
+ */
+static void
+zynqmp_disp_avbuf_set_clocks_sources(struct zynqmp_disp_avbuf *avbuf,
+				     bool video_from_ps, bool audio_from_ps,
+				     bool timings_internal)
+{
+	u32 val = 0;
+
+	if (video_from_ps)
+		val |= ZYNQMP_DISP_AV_BUF_CLK_SRC_VID_FROM_PS;
+	if (audio_from_ps)
+		val |= ZYNQMP_DISP_AV_BUF_CLK_SRC_AUD_FROM_PS;
+	if (timings_internal)
+		val |= ZYNQMP_DISP_AV_BUF_CLK_SRC_VID_INTERNAL_TIMING;
+
+	zynqmp_disp_avbuf_write(avbuf, ZYNQMP_DISP_AV_BUF_CLK_SRC, val);
+}
+
+/**
+ * zynqmp_disp_avbuf_enable_channels - Enable buffer channels
+ * @avbuf: Audio/video buffer manager
+ *
+ * Enable all (video and audio) buffer channels.
+ */
+static void zynqmp_disp_avbuf_enable_channels(struct zynqmp_disp_avbuf *avbuf)
+{
+	unsigned int i;
+	u32 val;
+
+	val = ZYNQMP_DISP_AV_BUF_CHBUF_EN |
+	      (ZYNQMP_DISP_AV_BUF_CHBUF_BURST_LEN_MAX <<
+	       ZYNQMP_DISP_AV_BUF_CHBUF_BURST_LEN_SHIFT);
+
+	for (i = 0; i < ZYNQMP_DISP_AV_BUF_NUM_VID_GFX_BUFFERS; i++)
+		zynqmp_disp_avbuf_write(avbuf, ZYNQMP_DISP_AV_BUF_CHBUF(i),
+					val);
+
+	val = ZYNQMP_DISP_AV_BUF_CHBUF_EN |
+	      (ZYNQMP_DISP_AV_BUF_CHBUF_BURST_LEN_AUD_MAX <<
+	       ZYNQMP_DISP_AV_BUF_CHBUF_BURST_LEN_SHIFT);
+
+	for (; i < ZYNQMP_DISP_AV_BUF_NUM_BUFFERS; i++)
+		zynqmp_disp_avbuf_write(avbuf, ZYNQMP_DISP_AV_BUF_CHBUF(i),
+					val);
+}
+
+/**
+ * zynqmp_disp_avbuf_disable_channels - Disable buffer channels
+ * @avbuf: Audio/video buffer manager
+ *
+ * Disable all (video and audio) buffer channels.
+ */
+static void zynqmp_disp_avbuf_disable_channels(struct zynqmp_disp_avbuf *avbuf)
+{
+	unsigned int i;
+
+	for (i = 0; i < ZYNQMP_DISP_AV_BUF_NUM_BUFFERS; i++)
+		zynqmp_disp_avbuf_write(avbuf, ZYNQMP_DISP_AV_BUF_CHBUF(i),
+					ZYNQMP_DISP_AV_BUF_CHBUF_FLUSH);
+}
+
+/**
+ * zynqmp_disp_avbuf_enable_audio - Enable audio
+ * @avbuf: Audio/video buffer manager
+ *
+ * Enable all audio buffers with a non-live (memory) source.
+ */
+static void zynqmp_disp_avbuf_enable_audio(struct zynqmp_disp_avbuf *avbuf)
+{
+	u32 val;
+
+	val = zynqmp_disp_avbuf_read(avbuf, ZYNQMP_DISP_AV_BUF_OUTPUT);
+	val &= ~ZYNQMP_DISP_AV_BUF_OUTPUT_AUD1_MASK;
+	val |= ZYNQMP_DISP_AV_BUF_OUTPUT_AUD1_MEM;
+	val |= ZYNQMP_DISP_AV_BUF_OUTPUT_AUD2_EN;
+	zynqmp_disp_avbuf_write(avbuf, ZYNQMP_DISP_AV_BUF_OUTPUT, val);
+}
+
+/**
+ * zynqmp_disp_avbuf_disable_audio - Disable audio
+ * @avbuf: Audio/video buffer manager
+ *
+ * Disable all audio buffers.
+ */
+static void zynqmp_disp_avbuf_disable_audio(struct zynqmp_disp_avbuf *avbuf)
+{
+	u32 val;
+
+	val = zynqmp_disp_avbuf_read(avbuf, ZYNQMP_DISP_AV_BUF_OUTPUT);
+	val &= ~ZYNQMP_DISP_AV_BUF_OUTPUT_AUD1_MASK;
+	val |= ZYNQMP_DISP_AV_BUF_OUTPUT_AUD1_DISABLE;
+	val &= ~ZYNQMP_DISP_AV_BUF_OUTPUT_AUD2_EN;
+	zynqmp_disp_avbuf_write(avbuf, ZYNQMP_DISP_AV_BUF_OUTPUT, val);
+}
+
+/**
+ * zynqmp_disp_avbuf_enable_video - Enable a video layer
+ * @avbuf: Audio/video buffer manager
+ * @layer: The layer ID
+ * @mode: Operating mode of layer
+ *
+ * Enable the video/graphics buffer for @layer.
+ */
+static void zynqmp_disp_avbuf_enable_video(struct zynqmp_disp_avbuf *avbuf,
+					   enum zynqmp_disp_layer_id layer,
+					   enum zynqmp_disp_layer_mode mode)
+{
+	u32 val;
+
+	val = zynqmp_disp_avbuf_read(avbuf, ZYNQMP_DISP_AV_BUF_OUTPUT);
+	if (layer == ZYNQMP_DISP_LAYER_VID) {
+		val &= ~ZYNQMP_DISP_AV_BUF_OUTPUT_VID1_MASK;
+		if (mode == ZYNQMP_DISP_LAYER_NONLIVE)
+			val |= ZYNQMP_DISP_AV_BUF_OUTPUT_VID1_MEM;
+		else
+			val |= ZYNQMP_DISP_AV_BUF_OUTPUT_VID1_LIVE;
+	} else {
+		val &= ~ZYNQMP_DISP_AV_BUF_OUTPUT_VID2_MASK;
+		val |= ZYNQMP_DISP_AV_BUF_OUTPUT_VID2_MEM;
+		if (mode == ZYNQMP_DISP_LAYER_NONLIVE)
+			val |= ZYNQMP_DISP_AV_BUF_OUTPUT_VID2_MEM;
+		else
+			val |= ZYNQMP_DISP_AV_BUF_OUTPUT_VID2_LIVE;
+	}
+	zynqmp_disp_avbuf_write(avbuf, ZYNQMP_DISP_AV_BUF_OUTPUT, val);
+}
+
+/**
+ * zynqmp_disp_avbuf_disable_video - Disable a video layer
+ * @avbuf: Audio/video buffer manager
+ * @layer: The layer ID
+ *
+ * Disable the video/graphics buffer for @layer.
+ */
+static void zynqmp_disp_avbuf_disable_video(struct zynqmp_disp_avbuf *avbuf,
+					    enum zynqmp_disp_layer_id layer)
+{
+	u32 val;
+
+	val = zynqmp_disp_avbuf_read(avbuf, ZYNQMP_DISP_AV_BUF_OUTPUT);
+	if (layer == ZYNQMP_DISP_LAYER_VID) {
+		val &= ~ZYNQMP_DISP_AV_BUF_OUTPUT_VID1_MASK;
+		val |= ZYNQMP_DISP_AV_BUF_OUTPUT_VID1_NONE;
+	} else {
+		val &= ~ZYNQMP_DISP_AV_BUF_OUTPUT_VID2_MASK;
+		val |= ZYNQMP_DISP_AV_BUF_OUTPUT_VID2_DISABLE;
+	}
+	zynqmp_disp_avbuf_write(avbuf, ZYNQMP_DISP_AV_BUF_OUTPUT, val);
+}
+
+/**
+ * zynqmp_disp_avbuf_enable - Enable the video pipe
+ * @avbuf: Audio/video buffer manager
+ *
+ * De-assert the video pipe reset.
+ */
+static void zynqmp_disp_avbuf_enable(struct zynqmp_disp_avbuf *avbuf)
+{
+	zynqmp_disp_avbuf_write(avbuf, ZYNQMP_DISP_AV_BUF_SRST_REG, 0);
+}
+
+/**
+ * zynqmp_disp_avbuf_disable - Disable the video pipe
+ * @avbuf: Audio/video buffer manager
+ *
+ * Assert the video pipe reset.
+ */
+static void zynqmp_disp_avbuf_disable(struct zynqmp_disp_avbuf *avbuf)
+{
+	zynqmp_disp_avbuf_write(avbuf, ZYNQMP_DISP_AV_BUF_SRST_REG,
+				ZYNQMP_DISP_AV_BUF_SRST_REG_VID_RST);
+}
+
+/* -----------------------------------------------------------------------------
+ * Blender (Video Pipeline)
+ */
+
+static void zynqmp_disp_blend_write(struct zynqmp_disp_blend *blend,
+				    int reg, u32 val)
+{
+	writel(val, blend->base + reg);
+}
+
+/*
+ * Colorspace conversion matrices.
+ *
+ * Hardcode RGB <-> YUV conversion to full-range SDTV for now.
+ */
+static const u16 csc_zero_matrix[] = {
+	0x0,    0x0,    0x0,
+	0x0,    0x0,    0x0,
+	0x0,    0x0,    0x0
+};
+
+static const u16 csc_identity_matrix[] = {
+	0x1000, 0x0,    0x0,
+	0x0,    0x1000, 0x0,
+	0x0,    0x0,    0x1000
+};
+
+static const u32 csc_zero_offsets[] = {
+	0, 0, 0
+};
+
+static const u16 csc_rgb_to_sdtv_matrix[] = {
+	0x4c9,  0x864,  0x1d3,
+	0x7d4d, 0x7ab3, 0x800,
+	0x800,  0x794d, 0x7eb3
+};
+
+static const u32 csc_rgb_to_sdtv_offsets[] = {
+	0x0, 0x8000000, 0x8000000
+};
+
+static const u16 csc_sdtv_to_rgb_matrix[] = {
+	0x1000, 0x166f, 0x0,
+	0x1000, 0x7483, 0x7a7f,
+	0x1000, 0x0,    0x1c5a
+};
+
+static const u32 csc_sdtv_to_rgb_offsets[] = {
+	0x0, 0x1800, 0x1800
+};
+
+/**
+ * zynqmp_disp_blend_set_output_format - Set the output format of the blender
+ * @blend: Blender object
+ * @format: Output format
+ *
+ * Set the output format of the blender to @format.
+ */
+static void zynqmp_disp_blend_set_output_format(struct zynqmp_disp_blend *blend,
+						enum zynqmp_dpsub_format format)
+{
+	static const unsigned int blend_output_fmts[] = {
+		[ZYNQMP_DPSUB_FORMAT_RGB] = ZYNQMP_DISP_V_BLEND_OUTPUT_VID_FMT_RGB,
+		[ZYNQMP_DPSUB_FORMAT_YCRCB444] = ZYNQMP_DISP_V_BLEND_OUTPUT_VID_FMT_YCBCR444,
+		[ZYNQMP_DPSUB_FORMAT_YCRCB422] = ZYNQMP_DISP_V_BLEND_OUTPUT_VID_FMT_YCBCR422
+					       | ZYNQMP_DISP_V_BLEND_OUTPUT_VID_FMT_EN_DOWNSAMPLE,
+		[ZYNQMP_DPSUB_FORMAT_YONLY] = ZYNQMP_DISP_V_BLEND_OUTPUT_VID_FMT_YONLY,
+	};
+
+	u32 fmt = blend_output_fmts[format];
+	const u16 *coeffs;
+	const u32 *offsets;
+	unsigned int i;
+
+	zynqmp_disp_blend_write(blend, ZYNQMP_DISP_V_BLEND_OUTPUT_VID_FMT, fmt);
+	if (fmt == ZYNQMP_DISP_V_BLEND_OUTPUT_VID_FMT_RGB) {
+		coeffs = csc_identity_matrix;
+		offsets = csc_zero_offsets;
+	} else {
+		coeffs = csc_rgb_to_sdtv_matrix;
+		offsets = csc_rgb_to_sdtv_offsets;
+	}
+
+	for (i = 0; i < ZYNQMP_DISP_V_BLEND_NUM_COEFF; i++)
+		zynqmp_disp_blend_write(blend,
+					ZYNQMP_DISP_V_BLEND_RGB2YCBCR_COEFF(i),
+					coeffs[i]);
+
+	for (i = 0; i < ZYNQMP_DISP_V_BLEND_NUM_OFFSET; i++)
+		zynqmp_disp_blend_write(blend,
+					ZYNQMP_DISP_V_BLEND_OUTCSC_OFFSET(i),
+					offsets[i]);
+}
+
+/**
+ * zynqmp_disp_blend_set_bg_color - Set the background color
+ * @blend: Blender object
+ * @rcr: Red/Cr color component
+ * @gy: Green/Y color component
+ * @bcb: Blue/Cb color component
+ *
+ * Set the background color to (@rcr, @gy, @bcb), corresponding to the R, G and
+ * B or Cr, Y and Cb components respectively depending on the selected output
+ * format.
+ */
+static void zynqmp_disp_blend_set_bg_color(struct zynqmp_disp_blend *blend,
+					   u32 rcr, u32 gy, u32 bcb)
+{
+	zynqmp_disp_blend_write(blend, ZYNQMP_DISP_V_BLEND_BG_CLR_0, rcr);
+	zynqmp_disp_blend_write(blend, ZYNQMP_DISP_V_BLEND_BG_CLR_1, gy);
+	zynqmp_disp_blend_write(blend, ZYNQMP_DISP_V_BLEND_BG_CLR_2, bcb);
+}
+
+/**
+ * zynqmp_disp_blend_set_global_alpha - Configure global alpha blending
+ * @blend: Blender object
+ * @enable: True to enable global alpha blending
+ * @alpha: Global alpha value (ignored if @enabled is false)
+ */
+static void zynqmp_disp_blend_set_global_alpha(struct zynqmp_disp_blend *blend,
+					       bool enable, u32 alpha)
+{
+	zynqmp_disp_blend_write(blend, ZYNQMP_DISP_V_BLEND_SET_GLOBAL_ALPHA,
+				ZYNQMP_DISP_V_BLEND_SET_GLOBAL_ALPHA_VALUE(alpha) |
+				(enable ? ZYNQMP_DISP_V_BLEND_SET_GLOBAL_ALPHA_EN : 0));
+}
+
+/**
+ * zynqmp_disp_blend_layer_set_csc - Configure colorspace conversion for layer
+ * @blend: Blender object
+ * @layer: The layer
+ * @coeffs: Colorspace conversion matrix
+ * @offsets: Colorspace conversion offsets
+ *
+ * Configure the input colorspace conversion matrix and offsets for the @layer.
+ * Columns of the matrix are automatically swapped based on the input format to
+ * handle RGB and YCrCb components permutations.
+ */
+static void zynqmp_disp_blend_layer_set_csc(struct zynqmp_disp_blend *blend,
+					    struct zynqmp_disp_layer *layer,
+					    const u16 *coeffs,
+					    const u32 *offsets)
+{
+	unsigned int swap[3] = { 0, 1, 2 };
+	unsigned int reg;
+	unsigned int i;
+
+	if (layer->disp_fmt->swap) {
+		if (layer->drm_fmt->is_yuv) {
+			/* Swap U and V. */
+			swap[1] = 2;
+			swap[2] = 1;
+		} else {
+			/* Swap R and B. */
+			swap[0] = 2;
+			swap[2] = 0;
+		}
+	}
+
+	if (layer->id == ZYNQMP_DISP_LAYER_VID)
+		reg = ZYNQMP_DISP_V_BLEND_IN1CSC_COEFF(0);
+	else
+		reg = ZYNQMP_DISP_V_BLEND_IN2CSC_COEFF(0);
+
+	for (i = 0; i < ZYNQMP_DISP_V_BLEND_NUM_COEFF; i += 3, reg += 12) {
+		zynqmp_disp_blend_write(blend, reg + 0, coeffs[i + swap[0]]);
+		zynqmp_disp_blend_write(blend, reg + 4, coeffs[i + swap[1]]);
+		zynqmp_disp_blend_write(blend, reg + 8, coeffs[i + swap[2]]);
+	}
+
+	if (layer->id == ZYNQMP_DISP_LAYER_VID)
+		reg = ZYNQMP_DISP_V_BLEND_IN1CSC_OFFSET(0);
+	else
+		reg = ZYNQMP_DISP_V_BLEND_IN2CSC_OFFSET(0);
+
+	for (i = 0; i < ZYNQMP_DISP_V_BLEND_NUM_OFFSET; i++)
+		zynqmp_disp_blend_write(blend, reg + i * 4, offsets[i]);
+}
+
+/**
+ * zynqmp_disp_blend_layer_enable - Enable a layer
+ * @blend: Blender object
+ * @layer: The layer
+ */
+static void zynqmp_disp_blend_layer_enable(struct zynqmp_disp_blend *blend,
+					   struct zynqmp_disp_layer *layer)
+{
+	const u16 *coeffs;
+	const u32 *offsets;
+	u32 val;
+
+	val = (layer->drm_fmt->is_yuv ?
+	       0 : ZYNQMP_DISP_V_BLEND_LAYER_CONTROL_RGB) |
+	      (layer->drm_fmt->hsub > 1 ?
+	       ZYNQMP_DISP_V_BLEND_LAYER_CONTROL_EN_US : 0);
+
+	zynqmp_disp_blend_write(blend,
+				ZYNQMP_DISP_V_BLEND_LAYER_CONTROL(layer->id),
+				val);
+
+	if (layer->drm_fmt->is_yuv) {
+		coeffs = csc_sdtv_to_rgb_matrix;
+		offsets = csc_sdtv_to_rgb_offsets;
+	} else {
+		coeffs = csc_identity_matrix;
+		offsets = csc_zero_offsets;
+	}
+
+	zynqmp_disp_blend_layer_set_csc(blend, layer, coeffs, offsets);
+}
+
+/**
+ * zynqmp_disp_blend_layer_disable - Disable a layer
+ * @blend: Blender object
+ * @layer: The layer
+ */
+static void zynqmp_disp_blend_layer_disable(struct zynqmp_disp_blend *blend,
+					    struct zynqmp_disp_layer *layer)
+{
+	zynqmp_disp_blend_write(blend,
+				ZYNQMP_DISP_V_BLEND_LAYER_CONTROL(layer->id),
+				0);
+
+	zynqmp_disp_blend_layer_set_csc(blend, layer, csc_zero_matrix,
+					csc_zero_offsets);
+}
+
+/* -----------------------------------------------------------------------------
+ * Audio Mixer
+ */
+
+static void zynqmp_disp_audio_write(struct zynqmp_disp_audio *audio,
+				  int reg, u32 val)
+{
+	writel(val, audio->base + reg);
+}
+
+/**
+ * zynqmp_disp_audio_enable - Enable the audio mixer
+ * @audio: Audio mixer
+ *
+ * Enable the audio mixer by de-asserting the soft reset. The audio state is set to
+ * default values by the reset, set the default mixer volume explicitly.
+ */
+static void zynqmp_disp_audio_enable(struct zynqmp_disp_audio *audio)
+{
+	/* Clear the audio soft reset register as it's an non-reset flop. */
+	zynqmp_disp_audio_write(audio, ZYNQMP_DISP_AUD_SOFT_RESET, 0);
+	zynqmp_disp_audio_write(audio, ZYNQMP_DISP_AUD_MIXER_VOLUME,
+				ZYNQMP_DISP_AUD_MIXER_VOLUME_NO_SCALE);
+}
+
+/**
+ * zynqmp_disp_audio_disable - Disable the audio mixer
+ * @audio: Audio mixer
+ *
+ * Disable the audio mixer by asserting its soft reset.
+ */
+static void zynqmp_disp_audio_disable(struct zynqmp_disp_audio *audio)
+{
+	zynqmp_disp_audio_write(audio, ZYNQMP_DISP_AUD_SOFT_RESET,
+				ZYNQMP_DISP_AUD_SOFT_RESET_AUD_SRST);
+}
+
+static void zynqmp_disp_audio_init(struct device *dev,
+				   struct zynqmp_disp_audio *audio)
+{
+	/* Try the live PL audio clock. */
+	audio->clk = devm_clk_get(dev, "dp_live_audio_aclk");
+	if (!IS_ERR(audio->clk)) {
+		audio->clk_from_ps = false;
+		return;
+	}
+
+	/* If the live PL audio clock is not valid, fall back to PS clock. */
+	audio->clk = devm_clk_get(dev, "dp_aud_clk");
+	if (!IS_ERR(audio->clk)) {
+		audio->clk_from_ps = true;
+		return;
+	}
+
+	dev_err(dev, "audio disabled due to missing clock\n");
+}
+
+/* -----------------------------------------------------------------------------
+ * ZynqMP Display external functions for zynqmp_dp
+ */
+
+/**
+ * zynqmp_disp_handle_vblank - Handle the vblank event
+ * @disp: Display controller
+ *
+ * This function handles the vblank interrupt, and sends an event to
+ * CRTC object. This will be called by the DP vblank interrupt handler.
+ */
+void zynqmp_disp_handle_vblank(struct zynqmp_disp *disp)
+{
+	struct drm_crtc *crtc = &disp->crtc;
+
+	drm_crtc_handle_vblank(crtc);
+}
+
+/**
+ * zynqmp_disp_audio_enabled - If the audio is enabled
+ * @disp: Display controller
+ *
+ * Return if the audio is enabled depending on the audio clock.
+ *
+ * Return: true if audio is enabled, or false.
+ */
+bool zynqmp_disp_audio_enabled(struct zynqmp_disp *disp)
+{
+	return !!disp->audio.clk;
+}
+
+/**
+ * zynqmp_disp_get_audio_clk_rate - Get the current audio clock rate
+ * @disp: Display controller
+ *
+ * Return: the current audio clock rate.
+ */
+unsigned int zynqmp_disp_get_audio_clk_rate(struct zynqmp_disp *disp)
+{
+	if (zynqmp_disp_audio_enabled(disp))
+		return 0;
+	return clk_get_rate(disp->audio.clk);
+}
+
+/**
+ * zynqmp_disp_get_crtc_mask - Return the CRTC bit mask
+ * @disp: Display controller
+ *
+ * Return: the crtc mask of the zyqnmp_disp CRTC.
+ */
+uint32_t zynqmp_disp_get_crtc_mask(struct zynqmp_disp *disp)
+{
+	return drm_crtc_mask(&disp->crtc);
+}
+
+/* -----------------------------------------------------------------------------
+ * ZynqMP Display Layer & DRM Plane
+ */
+
+/**
+ * zynqmp_disp_layer_find_format - Find format information for a DRM format
+ * @layer: The layer
+ * @drm_fmt: DRM format to search
+ *
+ * Search display subsystem format information corresponding to the given DRM
+ * format @drm_fmt for the @layer, and return a pointer to the format
+ * descriptor.
+ *
+ * Return: A pointer to the format descriptor if found, NULL otherwise
+ */
+static const struct zynqmp_disp_format *
+zynqmp_disp_layer_find_format(struct zynqmp_disp_layer *layer,
+			      u32 drm_fmt)
+{
+	unsigned int i;
+
+	for (i = 0; i < layer->info->num_formats; i++) {
+		if (layer->info->formats[i].drm_fmt == drm_fmt)
+			return &layer->info->formats[i];
+	}
+
+	return NULL;
+}
+
+/**
+ * zynqmp_disp_layer_enable - Enable a layer
+ * @layer: The layer
+ *
+ * Enable the @layer in the audio/video buffer manager and the blender. DMA
+ * channels are started separately by zynqmp_disp_layer_update().
+ */
+static void zynqmp_disp_layer_enable(struct zynqmp_disp_layer *layer)
+{
+	zynqmp_disp_avbuf_enable_video(&layer->disp->avbuf, layer->id,
+				       ZYNQMP_DISP_LAYER_NONLIVE);
+	zynqmp_disp_blend_layer_enable(&layer->disp->blend, layer);
+
+	layer->mode = ZYNQMP_DISP_LAYER_NONLIVE;
+}
+
+/**
+ * zynqmp_disp_layer_disable - Disable the layer
+ * @layer: The layer
+ *
+ * Disable the layer by stopping its DMA channels and disabling it in the
+ * audio/video buffer manager and the blender.
+ */
+static void zynqmp_disp_layer_disable(struct zynqmp_disp_layer *layer)
+{
+	unsigned int i;
+
+	for (i = 0; i < layer->drm_fmt->num_planes; i++)
+		dmaengine_terminate_sync(layer->dmas[i].chan);
+
+	zynqmp_disp_avbuf_disable_video(&layer->disp->avbuf, layer->id);
+	zynqmp_disp_blend_layer_disable(&layer->disp->blend, layer);
+}
+
+/**
+ * zynqmp_disp_layer_set_format - Set the layer format
+ * @layer: The layer
+ * @state: The plane state
+ *
+ * Set the format for @layer based on @state->fb->format. The layer must be
+ * disabled.
+ */
+static void zynqmp_disp_layer_set_format(struct zynqmp_disp_layer *layer,
+					 struct drm_plane_state *state)
+{
+	const struct drm_format_info *info = state->fb->format;
+	unsigned int i;
+
+	layer->disp_fmt = zynqmp_disp_layer_find_format(layer, info->format);
+	layer->drm_fmt = info;
+
+	zynqmp_disp_avbuf_set_format(&layer->disp->avbuf, layer->id,
+				     layer->disp_fmt);
+
+	/*
+	 * Set slave_id for each DMA channel to indicate they're part of a
+	 * video group.
+	 */
+	for (i = 0; i < info->num_planes; i++) {
+		struct zynqmp_disp_layer_dma *dma = &layer->dmas[i];
+		struct dma_slave_config config = {
+			.direction = DMA_MEM_TO_DEV,
+			.slave_id = 1,
+		};
+
+		dmaengine_slave_config(dma->chan, &config);
+	}
+}
+
+/**
+ * zynqmp_disp_layer_update - Update the layer framebuffer
+ * @layer: The layer
+ * @state: The plane state
+ *
+ * Update the framebuffer for the layer by issuing a new DMA engine transaction
+ * for the new framebuffer.
+ *
+ * Return: 0 on success, or the DMA descriptor failure error otherwise
+ */
+static int zynqmp_disp_layer_update(struct zynqmp_disp_layer *layer,
+				    struct drm_plane_state *state)
+{
+	const struct drm_format_info *info = layer->drm_fmt;
+	unsigned int i;
+
+	for (i = 0; i < layer->drm_fmt->num_planes; i++) {
+		unsigned int width = state->crtc_w / (i ? info->hsub : 1);
+		unsigned int height = state->crtc_h / (i ? info->vsub : 1);
+		struct zynqmp_disp_layer_dma *dma = &layer->dmas[i];
+		struct dma_async_tx_descriptor *desc;
+		dma_addr_t paddr;
+
+		paddr = drm_fb_cma_get_gem_addr(state->fb, state, i);
+
+		dma->xt.numf = height;
+		dma->sgl.size = width * info->cpp[i];
+		dma->sgl.icg = state->fb->pitches[i] - dma->sgl.size;
+		dma->xt.src_start = paddr;
+		dma->xt.frame_size = 1;
+		dma->xt.dir = DMA_MEM_TO_DEV;
+		dma->xt.src_sgl = true;
+		dma->xt.dst_sgl = false;
+
+		desc = dmaengine_prep_interleaved_dma(dma->chan, &dma->xt,
+						      DMA_CTRL_ACK |
+						      DMA_PREP_REPEAT |
+						      DMA_PREP_LOAD_EOT);
+		if (!desc) {
+			dev_err(layer->disp->dev,
+				"failed to prepare DMA descriptor\n");
+			return -ENOMEM;
+		}
+
+		dmaengine_submit(desc);
+		dma_async_issue_pending(dma->chan);
+	}
+
+	return 0;
+}
+
+static inline struct zynqmp_disp_layer *plane_to_layer(struct drm_plane *plane)
+{
+	return container_of(plane, struct zynqmp_disp_layer, plane);
+}
+
+static int
+zynqmp_disp_plane_atomic_check(struct drm_plane *plane,
+			       struct drm_plane_state *state)
+{
+	struct drm_crtc_state *crtc_state;
+
+	if (!state->crtc)
+		return 0;
+
+	crtc_state = drm_atomic_get_crtc_state(state->state, state->crtc);
+	if (IS_ERR(crtc_state))
+		return PTR_ERR(crtc_state);
+
+	return drm_atomic_helper_check_plane_state(state, crtc_state,
+						   DRM_PLANE_HELPER_NO_SCALING,
+						   DRM_PLANE_HELPER_NO_SCALING,
+						   false, false);
+}
+
+static void
+zynqmp_disp_plane_atomic_disable(struct drm_plane *plane,
+				 struct drm_plane_state *old_state)
+{
+	struct zynqmp_disp_layer *layer = plane_to_layer(plane);
+
+	if (!old_state->fb)
+		return;
+
+	zynqmp_disp_layer_disable(layer);
+}
+
+static void
+zynqmp_disp_plane_atomic_update(struct drm_plane *plane,
+				struct drm_plane_state *old_state)
+{
+	struct zynqmp_disp_layer *layer = plane_to_layer(plane);
+	bool format_changed = false;
+
+	if (!old_state->fb ||
+	    old_state->fb->format->format != plane->state->fb->format->format)
+		format_changed = true;
+
+	/*
+	 * If the format has changed (including going from a previously
+	 * disabled state to any format), reconfigure the format. Disable the
+	 * plane first if needed.
+	 */
+	if (format_changed) {
+		if (old_state->fb)
+			zynqmp_disp_layer_disable(layer);
+
+		zynqmp_disp_layer_set_format(layer, plane->state);
+	}
+
+	zynqmp_disp_layer_update(layer, plane->state);
+
+	/* Enable or re-enable the plane is the format has changed. */
+	if (format_changed)
+		zynqmp_disp_layer_enable(layer);
+}
+
+static const struct drm_plane_helper_funcs zynqmp_disp_plane_helper_funcs = {
+	.atomic_check		= zynqmp_disp_plane_atomic_check,
+	.atomic_update		= zynqmp_disp_plane_atomic_update,
+	.atomic_disable		= zynqmp_disp_plane_atomic_disable,
+};
+
+static const struct drm_plane_funcs zynqmp_disp_plane_funcs = {
+	.update_plane		= drm_atomic_helper_update_plane,
+	.disable_plane		= drm_atomic_helper_disable_plane,
+	.destroy		= drm_plane_cleanup,
+	.reset			= drm_atomic_helper_plane_reset,
+	.atomic_duplicate_state	= drm_atomic_helper_plane_duplicate_state,
+	.atomic_destroy_state	= drm_atomic_helper_plane_destroy_state,
+};
+
+static int zynqmp_disp_create_planes(struct zynqmp_disp *disp)
+{
+	unsigned int i, j;
+	int ret;
+
+	for (i = 0; i < ZYNQMP_DISP_NUM_LAYERS; i++) {
+		struct zynqmp_disp_layer *layer = &disp->layers[i];
+		enum drm_plane_type type;
+		u32 *drm_formats;
+
+		drm_formats = drmm_kcalloc(disp->drm, sizeof(*drm_formats),
+					   layer->info->num_formats,
+					   GFP_KERNEL);
+		if (!drm_formats)
+			return -ENOMEM;
+
+		for (j = 0; j < layer->info->num_formats; ++j)
+			drm_formats[j] = layer->info->formats[j].drm_fmt;
+
+		/* Graphics layer is primary, and video layer is overlay. */
+		type = i == ZYNQMP_DISP_LAYER_GFX
+		     ? DRM_PLANE_TYPE_PRIMARY : DRM_PLANE_TYPE_OVERLAY;
+		ret = drm_universal_plane_init(disp->drm, &layer->plane, 0,
+					       &zynqmp_disp_plane_funcs,
+					       drm_formats,
+					       layer->info->num_formats,
+					       NULL, type, NULL);
+		if (ret)
+			return ret;
+
+		drm_plane_helper_add(&layer->plane,
+				     &zynqmp_disp_plane_helper_funcs);
+	}
+
+	return 0;
+}
+
+/**
+ * zynqmp_disp_layer_release_dma - Release DMA channels for a layer
+ * @disp: Display controller
+ * @layer: The layer
+ *
+ * Release the DMA channels associated with @layer.
+ */
+static void zynqmp_disp_layer_release_dma(struct zynqmp_disp *disp,
+					  struct zynqmp_disp_layer *layer)
+{
+	unsigned int i;
+
+	if (!layer->info)
+		return;
+
+	for (i = 0; i < layer->info->num_channels; i++) {
+		struct zynqmp_disp_layer_dma *dma = &layer->dmas[i];
+
+		if (!dma->chan)
+			continue;
+
+		/* Make sure the channel is terminated before release. */
+		dmaengine_terminate_sync(dma->chan);
+		dma_release_channel(dma->chan);
+	}
+}
+
+/**
+ * zynqmp_disp_destroy_layers - Destroy all layers
+ * @disp: Display controller
+ */
+static void zynqmp_disp_destroy_layers(struct zynqmp_disp *disp)
+{
+	unsigned int i;
+
+	for (i = 0; i < ZYNQMP_DISP_NUM_LAYERS; i++)
+		zynqmp_disp_layer_release_dma(disp, &disp->layers[i]);
+}
+
+/**
+ * zynqmp_disp_layer_request_dma - Request DMA channels for a layer
+ * @disp: Display controller
+ * @layer: The layer
+ *
+ * Request all DMA engine channels needed by @layer.
+ *
+ * Return: 0 on success, or the DMA channel request error otherwise
+ */
+static int zynqmp_disp_layer_request_dma(struct zynqmp_disp *disp,
+					 struct zynqmp_disp_layer *layer)
+{
+	static const char * const dma_names[] = { "vid", "gfx" };
+	unsigned int i;
+	int ret;
+
+	for (i = 0; i < layer->info->num_channels; i++) {
+		struct zynqmp_disp_layer_dma *dma = &layer->dmas[i];
+		char dma_channel_name[16];
+
+		snprintf(dma_channel_name, sizeof(dma_channel_name),
+			 "%s%u", dma_names[layer->id], i);
+		dma->chan = of_dma_request_slave_channel(disp->dev->of_node,
+							 dma_channel_name);
+		if (IS_ERR(dma->chan)) {
+			dev_err(disp->dev, "failed to request dma channel\n");
+			ret = PTR_ERR(dma->chan);
+			dma->chan = NULL;
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+/**
+ * zynqmp_disp_create_layers - Create and initialize all layers
+ * @disp: Display controller
+ *
+ * Return: 0 on success, or the DMA channel request error otherwise
+ */
+static int zynqmp_disp_create_layers(struct zynqmp_disp *disp)
+{
+	static const struct zynqmp_disp_layer_info layer_info[] = {
+		[ZYNQMP_DISP_LAYER_VID] = {
+			.formats = avbuf_vid_fmts,
+			.num_formats = ARRAY_SIZE(avbuf_vid_fmts),
+			.num_channels = 3,
+		},
+		[ZYNQMP_DISP_LAYER_GFX] = {
+			.formats = avbuf_gfx_fmts,
+			.num_formats = ARRAY_SIZE(avbuf_gfx_fmts),
+			.num_channels = 1,
+		},
+	};
+
+	unsigned int i;
+	int ret;
+
+	for (i = 0; i < ZYNQMP_DISP_NUM_LAYERS; i++) {
+		struct zynqmp_disp_layer *layer = &disp->layers[i];
+
+		layer->id = i;
+		layer->disp = disp;
+		layer->info = &layer_info[i];
+
+		ret = zynqmp_disp_layer_request_dma(disp, layer);
+		if (ret)
+			goto err;
+	}
+
+	return 0;
+
+err:
+	zynqmp_disp_destroy_layers(disp);
+	return ret;
+}
+
+/* -----------------------------------------------------------------------------
+ * ZynqMP Display & DRM CRTC
+ */
+
+/**
+ * zynqmp_disp_enable - Enable the display controller
+ * @disp: Display controller
+ */
+static void zynqmp_disp_enable(struct zynqmp_disp *disp)
+{
+	zynqmp_disp_avbuf_enable(&disp->avbuf);
+	/* Choose clock source based on the DT clock handle. */
+	zynqmp_disp_avbuf_set_clocks_sources(&disp->avbuf, disp->pclk_from_ps,
+					     disp->audio.clk_from_ps, true);
+	zynqmp_disp_avbuf_enable_channels(&disp->avbuf);
+	zynqmp_disp_avbuf_enable_audio(&disp->avbuf);
+
+	zynqmp_disp_audio_enable(&disp->audio);
+}
+
+/**
+ * zynqmp_disp_disable - Disable the display controller
+ * @disp: Display controller
+ */
+static void zynqmp_disp_disable(struct zynqmp_disp *disp)
+{
+	struct drm_crtc *crtc = &disp->crtc;
+
+	zynqmp_disp_audio_disable(&disp->audio);
+
+	zynqmp_disp_avbuf_disable_audio(&disp->avbuf);
+	zynqmp_disp_avbuf_disable_channels(&disp->avbuf);
+	zynqmp_disp_avbuf_disable(&disp->avbuf);
+
+	/* Mark the flip is done as crtc is disabled anyway */
+	if (crtc->state->event) {
+		complete_all(crtc->state->event->base.completion);
+		crtc->state->event = NULL;
+	}
+}
+
+static inline struct zynqmp_disp *crtc_to_disp(struct drm_crtc *crtc)
+{
+	return container_of(crtc, struct zynqmp_disp, crtc);
+}
+
+static int zynqmp_disp_crtc_setup_clock(struct drm_crtc *crtc,
+					struct drm_display_mode *adjusted_mode)
+{
+	struct zynqmp_disp *disp = crtc_to_disp(crtc);
+	unsigned long mode_clock = adjusted_mode->clock * 1000;
+	unsigned long rate;
+	long diff;
+	int ret;
+
+	ret = clk_set_rate(disp->pclk, mode_clock);
+	if (ret) {
+		dev_err(disp->dev, "failed to set a pixel clock\n");
+		return ret;
+	}
+
+	rate = clk_get_rate(disp->pclk);
+	diff = rate - mode_clock;
+	if (abs(diff) > mode_clock / 20)
+		dev_info(disp->dev,
+			 "requested pixel rate: %lu actual rate: %lu\n",
+			 mode_clock, rate);
+	else
+		dev_dbg(disp->dev,
+			"requested pixel rate: %lu actual rate: %lu\n",
+			mode_clock, rate);
+
+	return 0;
+}
+
+static void
+zynqmp_disp_crtc_atomic_enable(struct drm_crtc *crtc,
+			       struct drm_crtc_state *old_crtc_state)
+{
+	struct zynqmp_disp *disp = crtc_to_disp(crtc);
+	struct drm_display_mode *adjusted_mode = &crtc->state->adjusted_mode;
+	int ret, vrefresh;
+
+	zynqmp_disp_crtc_setup_clock(crtc, adjusted_mode);
+
+	pm_runtime_get_sync(disp->dev);
+	ret = clk_prepare_enable(disp->pclk);
+	if (ret) {
+		dev_err(disp->dev, "failed to enable a pixel clock\n");
+		pm_runtime_put_sync(disp->dev);
+		return;
+	}
+
+	zynqmp_disp_blend_set_output_format(&disp->blend,
+					    ZYNQMP_DPSUB_FORMAT_RGB);
+	zynqmp_disp_blend_set_bg_color(&disp->blend, 0, 0, 0);
+	zynqmp_disp_blend_set_global_alpha(&disp->blend, false, 0);
+
+	zynqmp_disp_enable(disp);
+
+	/* Delay of 3 vblank intervals for timing gen to be stable */
+	vrefresh = (adjusted_mode->clock * 1000) /
+		   (adjusted_mode->vtotal * adjusted_mode->htotal);
+	msleep(3 * 1000 / vrefresh);
+}
+
+static void
+zynqmp_disp_crtc_atomic_disable(struct drm_crtc *crtc,
+				struct drm_crtc_state *old_crtc_state)
+{
+	struct zynqmp_disp *disp = crtc_to_disp(crtc);
+	struct drm_plane_state *old_plane_state;
+
+	/*
+	 * Disable the plane if active. The old plane state can be NULL in the
+	 * .shutdown() path if the plane is already disabled, skip
+	 * zynqmp_disp_plane_atomic_disable() in that case.
+	 */
+	old_plane_state = drm_atomic_get_old_plane_state(old_crtc_state->state,
+							 crtc->primary);
+	if (old_plane_state)
+		zynqmp_disp_plane_atomic_disable(crtc->primary, old_plane_state);
+
+	zynqmp_disp_disable(disp);
+
+	drm_crtc_vblank_off(&disp->crtc);
+
+	clk_disable_unprepare(disp->pclk);
+	pm_runtime_put_sync(disp->dev);
+}
+
+static int zynqmp_disp_crtc_atomic_check(struct drm_crtc *crtc,
+					 struct drm_crtc_state *state)
+{
+	return drm_atomic_add_affected_planes(state->state, crtc);
+}
+
+static void
+zynqmp_disp_crtc_atomic_begin(struct drm_crtc *crtc,
+			      struct drm_crtc_state *old_crtc_state)
+{
+	drm_crtc_vblank_on(crtc);
+}
+
+static void
+zynqmp_disp_crtc_atomic_flush(struct drm_crtc *crtc,
+			      struct drm_crtc_state *old_crtc_state)
+{
+	if (crtc->state->event) {
+		struct drm_pending_vblank_event *event;
+
+		/* Consume the flip_done event from atomic helper. */
+		event = crtc->state->event;
+		crtc->state->event = NULL;
+
+		event->pipe = drm_crtc_index(crtc);
+
+		WARN_ON(drm_crtc_vblank_get(crtc) != 0);
+
+		spin_lock_irq(&crtc->dev->event_lock);
+		drm_crtc_arm_vblank_event(crtc, event);
+		spin_unlock_irq(&crtc->dev->event_lock);
+	}
+}
+
+static const struct drm_crtc_helper_funcs zynqmp_disp_crtc_helper_funcs = {
+	.atomic_enable	= zynqmp_disp_crtc_atomic_enable,
+	.atomic_disable	= zynqmp_disp_crtc_atomic_disable,
+	.atomic_check	= zynqmp_disp_crtc_atomic_check,
+	.atomic_begin	= zynqmp_disp_crtc_atomic_begin,
+	.atomic_flush	= zynqmp_disp_crtc_atomic_flush,
+};
+
+static int zynqmp_disp_crtc_enable_vblank(struct drm_crtc *crtc)
+{
+	struct zynqmp_disp *disp = crtc_to_disp(crtc);
+
+	zynqmp_dp_enable_vblank(disp->dpsub->dp);
+
+	return 0;
+}
+
+static void zynqmp_disp_crtc_disable_vblank(struct drm_crtc *crtc)
+{
+	struct zynqmp_disp *disp = crtc_to_disp(crtc);
+
+	zynqmp_dp_disable_vblank(disp->dpsub->dp);
+}
+
+static const struct drm_crtc_funcs zynqmp_disp_crtc_funcs = {
+	.destroy		= drm_crtc_cleanup,
+	.set_config		= drm_atomic_helper_set_config,
+	.page_flip		= drm_atomic_helper_page_flip,
+	.reset			= drm_atomic_helper_crtc_reset,
+	.atomic_duplicate_state	= drm_atomic_helper_crtc_duplicate_state,
+	.atomic_destroy_state	= drm_atomic_helper_crtc_destroy_state,
+	.enable_vblank		= zynqmp_disp_crtc_enable_vblank,
+	.disable_vblank		= zynqmp_disp_crtc_disable_vblank,
+};
+
+static int zynqmp_disp_create_crtc(struct zynqmp_disp *disp)
+{
+	struct drm_plane *plane = &disp->layers[ZYNQMP_DISP_LAYER_GFX].plane;
+	int ret;
+
+	ret = drm_crtc_init_with_planes(disp->drm, &disp->crtc, plane,
+					NULL, &zynqmp_disp_crtc_funcs, NULL);
+	if (ret < 0)
+		return ret;
+
+	drm_crtc_helper_add(&disp->crtc, &zynqmp_disp_crtc_helper_funcs);
+
+	/* Start with vertical blanking interrupt reporting disabled. */
+	drm_crtc_vblank_off(&disp->crtc);
+
+	return 0;
+}
+
+static void zynqmp_disp_map_crtc_to_plane(struct zynqmp_disp *disp)
+{
+	u32 possible_crtcs = drm_crtc_mask(&disp->crtc);
+	unsigned int i;
+
+	for (i = 0; i < ZYNQMP_DISP_NUM_LAYERS; i++)
+		disp->layers[i].plane.possible_crtcs = possible_crtcs;
+}
+
+/* -----------------------------------------------------------------------------
+ * Initialization & Cleanup
+ */
+
+int zynqmp_disp_drm_init(struct zynqmp_dpsub *dpsub)
+{
+	struct zynqmp_disp *disp = dpsub->disp;
+	int ret;
+
+	ret = zynqmp_disp_create_planes(disp);
+	if (ret)
+		return ret;
+
+	ret = zynqmp_disp_create_crtc(disp);
+	if (ret < 0)
+		return ret;
+
+	zynqmp_disp_map_crtc_to_plane(disp);
+
+	return 0;
+}
+
+int zynqmp_disp_probe(struct zynqmp_dpsub *dpsub, struct drm_device *drm)
+{
+	struct platform_device *pdev = to_platform_device(dpsub->dev);
+	struct zynqmp_disp *disp;
+	struct zynqmp_disp_layer *layer;
+	struct resource *res;
+	int ret;
+
+	disp = drmm_kzalloc(drm, sizeof(*disp), GFP_KERNEL);
+	if (!disp)
+		return -ENOMEM;
+
+	disp->dev = &pdev->dev;
+	disp->dpsub = dpsub;
+	disp->drm = drm;
+
+	dpsub->disp = disp;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "blend");
+	disp->blend.base = devm_ioremap_resource(disp->dev, res);
+	if (IS_ERR(disp->blend.base))
+		return PTR_ERR(disp->blend.base);
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "av_buf");
+	disp->avbuf.base = devm_ioremap_resource(disp->dev, res);
+	if (IS_ERR(disp->avbuf.base))
+		return PTR_ERR(disp->avbuf.base);
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "aud");
+	disp->audio.base = devm_ioremap_resource(disp->dev, res);
+	if (IS_ERR(disp->audio.base))
+		return PTR_ERR(disp->audio.base);
+
+	/* Try the live PL video clock */
+	disp->pclk = devm_clk_get(disp->dev, "dp_live_video_in_clk");
+	if (!IS_ERR(disp->pclk))
+		disp->pclk_from_ps = false;
+	else if (PTR_ERR(disp->pclk) == -EPROBE_DEFER)
+		return PTR_ERR(disp->pclk);
+
+	/* If the live PL video clock is not valid, fall back to PS clock */
+	if (IS_ERR_OR_NULL(disp->pclk)) {
+		disp->pclk = devm_clk_get(disp->dev, "dp_vtc_pixel_clk_in");
+		if (IS_ERR(disp->pclk)) {
+			dev_err(disp->dev, "failed to init any video clock\n");
+			return PTR_ERR(disp->pclk);
+		}
+		disp->pclk_from_ps = true;
+	}
+
+	zynqmp_disp_audio_init(disp->dev, &disp->audio);
+
+	ret = zynqmp_disp_create_layers(disp);
+	if (ret)
+		return ret;
+
+	layer = &disp->layers[ZYNQMP_DISP_LAYER_VID];
+	dpsub->dma_align = 1 << layer->dmas[0].chan->device->copy_align;
+
+	return 0;
+}
+
+void zynqmp_disp_remove(struct zynqmp_dpsub *dpsub)
+{
+	struct zynqmp_disp *disp = dpsub->disp;
+
+	zynqmp_disp_destroy_layers(disp);
+}

drivers/gpu/drm/xlnx/zynqmp_disp.h

···
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * ZynqMP Display Driver
+ *
+ * Copyright (C) 2017 - 2020 Xilinx, Inc.
+ *
+ * Authors:
+ * - Hyun Woo Kwon <[e-mail]>
+ * - Laurent Pinchart <[e-mail]>
+ */
+
+#ifndef _ZYNQMP_DISP_H_
+#define _ZYNQMP_DISP_H_
+
+#include <linux/types.h>
+
+/*
+ * 3840x2160 is advertised as the maximum resolution, but almost any
+ * resolutions under a 300Mhz pixel rate would work. Pick 4096x4096.
+ */
+#define ZYNQMP_DISP_MAX_WIDTH				4096
+#define ZYNQMP_DISP_MAX_HEIGHT				4096
+
+/* The DPDMA is limited to 44 bit addressing. */
+#define ZYNQMP_DISP_MAX_DMA_BIT				44
+
+struct device;
+struct drm_device;
+struct platform_device;
+struct zynqmp_disp;
+struct zynqmp_dpsub;
+
+void zynqmp_disp_handle_vblank(struct zynqmp_disp *disp);
+bool zynqmp_disp_audio_enabled(struct zynqmp_disp *disp);
+unsigned int zynqmp_disp_get_audio_clk_rate(struct zynqmp_disp *disp);
+uint32_t zynqmp_disp_get_crtc_mask(struct zynqmp_disp *disp);
+
+int zynqmp_disp_drm_init(struct zynqmp_dpsub *dpsub);
+int zynqmp_disp_probe(struct zynqmp_dpsub *dpsub, struct drm_device *drm);
+void zynqmp_disp_remove(struct zynqmp_dpsub *dpsub);
+
+#endif /* _ZYNQMP_DISP_H_ */

drivers/gpu/drm/xlnx/zynqmp_disp_regs.h

···
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * ZynqMP Display Controller Driver - Register Definitions
+ *
+ * Copyright (C) 2017 - 2020 Xilinx, Inc.
+ *
+ * Authors:
+ * - Hyun Woo Kwon <[e-mail]>
+ * - Laurent Pinchart <[e-mail]>
+ */
+
+#ifndef _ZYNQMP_DISP_REGS_H_
+#define _ZYNQMP_DISP_REGS_H_
+
+#include <linux/bits.h>
+
+/* Blender registers */
+#define ZYNQMP_DISP_V_BLEND_BG_CLR_0			0x0
+#define ZYNQMP_DISP_V_BLEND_BG_CLR_1			0x4
+#define ZYNQMP_DISP_V_BLEND_BG_CLR_2			0x8
+#define ZYNQMP_DISP_V_BLEND_BG_MAX			0xfff
+#define ZYNQMP_DISP_V_BLEND_SET_GLOBAL_ALPHA		0xc
+#define ZYNQMP_DISP_V_BLEND_SET_GLOBAL_ALPHA_VALUE(n)	((n) << 1)
+#define ZYNQMP_DISP_V_BLEND_SET_GLOBAL_ALPHA_EN		BIT(0)
+#define ZYNQMP_DISP_V_BLEND_OUTPUT_VID_FMT		0x14
+#define ZYNQMP_DISP_V_BLEND_OUTPUT_VID_FMT_RGB		0x0
+#define ZYNQMP_DISP_V_BLEND_OUTPUT_VID_FMT_YCBCR444	0x1
+#define ZYNQMP_DISP_V_BLEND_OUTPUT_VID_FMT_YCBCR422	0x2
+#define ZYNQMP_DISP_V_BLEND_OUTPUT_VID_FMT_YONLY	0x3
+#define ZYNQMP_DISP_V_BLEND_OUTPUT_VID_FMT_XVYCC	0x4
+#define ZYNQMP_DISP_V_BLEND_OUTPUT_VID_FMT_EN_DOWNSAMPLE	BIT(4)
+#define ZYNQMP_DISP_V_BLEND_LAYER_CONTROL(n)		(0x18 + ((n) * 4))
+#define ZYNQMP_DISP_V_BLEND_LAYER_CONTROL_EN_US		BIT(0)
+#define ZYNQMP_DISP_V_BLEND_LAYER_CONTROL_RGB		BIT(1)
+#define ZYNQMP_DISP_V_BLEND_LAYER_CONTROL_BYPASS	BIT(8)
+#define ZYNQMP_DISP_V_BLEND_NUM_COEFF			9
+#define ZYNQMP_DISP_V_BLEND_NUM_OFFSET			3
+#define ZYNQMP_DISP_V_BLEND_RGB2YCBCR_COEFF(n)		(0x20 + ((n) * 4))
+#define ZYNQMP_DISP_V_BLEND_IN1CSC_COEFF(n)		(0x44 + ((n) * 4))
+#define ZYNQMP_DISP_V_BLEND_IN1CSC_OFFSET(n)		(0x68 + ((n) * 4))
+#define ZYNQMP_DISP_V_BLEND_OUTCSC_OFFSET(n)		(0x74 + ((n) * 4))
+#define ZYNQMP_DISP_V_BLEND_IN2CSC_COEFF(n)		(0x80 + ((n) * 4))
+#define ZYNQMP_DISP_V_BLEND_IN2CSC_OFFSET(n)		(0xa4 + ((n) * 4))
+#define ZYNQMP_DISP_V_BLEND_CHROMA_KEY_ENABLE		0x1d0
+#define ZYNQMP_DISP_V_BLEND_CHROMA_KEY_COMP1		0x1d4
+#define ZYNQMP_DISP_V_BLEND_CHROMA_KEY_COMP2		0x1d8
+#define ZYNQMP_DISP_V_BLEND_CHROMA_KEY_COMP3		0x1dc
+
+/* AV buffer manager registers */
+#define ZYNQMP_DISP_AV_BUF_FMT				0x0
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_VID_SHIFT		0
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_VID_MASK		(0x1f << 0)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_VID_UYVY		(0 << 0)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_VID_VYUY		(1 << 0)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YVYU		(2 << 0)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YUYV		(3 << 0)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YV16		(4 << 0)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YV24		(5 << 0)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YV16CI		(6 << 0)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_VID_MONO		(7 << 0)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YV16CI2		(8 << 0)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YUV444		(9 << 0)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_VID_RGB888		(10 << 0)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_VID_RGBA8880		(11 << 0)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_VID_RGB888_10		(12 << 0)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YUV444_10		(13 << 0)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YV16CI2_10	(14 << 0)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YV16CI_10		(15 << 0)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YV16_10		(16 << 0)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YV24_10		(17 << 0)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YONLY_10		(18 << 0)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YV16_420		(19 << 0)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YV16CI_420	(20 << 0)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YV16CI2_420	(21 << 0)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YV16_420_10	(22 << 0)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YV16CI_420_10	(23 << 0)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_VID_YV16CI2_420_10	(24 << 0)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_SHIFT		8
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_MASK		(0xf << 8)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_RGBA8888		(0 << 8)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_ABGR8888		(1 << 8)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_RGB888		(2 << 8)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_BGR888		(3 << 8)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_RGBA5551		(4 << 8)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_RGBA4444		(5 << 8)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_RGB565		(6 << 8)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_8BPP		(7 << 8)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_4BPP		(8 << 8)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_2BPP		(9 << 8)
+#define ZYNQMP_DISP_AV_BUF_FMT_NL_GFX_1BPP		(10 << 8)
+#define ZYNQMP_DISP_AV_BUF_NON_LIVE_LATENCY		0x8
+#define ZYNQMP_DISP_AV_BUF_CHBUF(n)			(0x10 + ((n) * 4))
+#define ZYNQMP_DISP_AV_BUF_CHBUF_EN			BIT(0)
+#define ZYNQMP_DISP_AV_BUF_CHBUF_FLUSH			BIT(1)
+#define ZYNQMP_DISP_AV_BUF_CHBUF_BURST_LEN_SHIFT	2
+#define ZYNQMP_DISP_AV_BUF_CHBUF_BURST_LEN_MASK		(0xf << 2)
+#define ZYNQMP_DISP_AV_BUF_CHBUF_BURST_LEN_MAX		0xf
+#define ZYNQMP_DISP_AV_BUF_CHBUF_BURST_LEN_AUD_MAX	0x3
+#define ZYNQMP_DISP_AV_BUF_STATUS			0x28
+#define ZYNQMP_DISP_AV_BUF_STC_CTRL			0x2c
+#define ZYNQMP_DISP_AV_BUF_STC_CTRL_EN			BIT(0)
+#define ZYNQMP_DISP_AV_BUF_STC_CTRL_EVENT_SHIFT		1
+#define ZYNQMP_DISP_AV_BUF_STC_CTRL_EVENT_EX_VSYNC	0
+#define ZYNQMP_DISP_AV_BUF_STC_CTRL_EVENT_EX_VID	1
+#define ZYNQMP_DISP_AV_BUF_STC_CTRL_EVENT_EX_AUD	2
+#define ZYNQMP_DISP_AV_BUF_STC_CTRL_EVENT_INT_VSYNC	3
+#define ZYNQMP_DISP_AV_BUF_STC_INIT_VALUE0		0x30
+#define ZYNQMP_DISP_AV_BUF_STC_INIT_VALUE1		0x34
+#define ZYNQMP_DISP_AV_BUF_STC_ADJ			0x38
+#define ZYNQMP_DISP_AV_BUF_STC_VID_VSYNC_TS0		0x3c
+#define ZYNQMP_DISP_AV_BUF_STC_VID_VSYNC_TS1		0x40
+#define ZYNQMP_DISP_AV_BUF_STC_EXT_VSYNC_TS0		0x44
+#define ZYNQMP_DISP_AV_BUF_STC_EXT_VSYNC_TS1		0x48
+#define ZYNQMP_DISP_AV_BUF_STC_CUSTOM_EVENT_TS0		0x4c
+#define ZYNQMP_DISP_AV_BUF_STC_CUSTOM_EVENT_TS1		0x50
+#define ZYNQMP_DISP_AV_BUF_STC_CUSTOM_EVENT2_TS0	0x54
+#define ZYNQMP_DISP_AV_BUF_STC_CUSTOM_EVENT2_TS1	0x58
+#define ZYNQMP_DISP_AV_BUF_STC_SNAPSHOT0		0x60
+#define ZYNQMP_DISP_AV_BUF_STC_SNAPSHOT1		0x64
+#define ZYNQMP_DISP_AV_BUF_OUTPUT			0x70
+#define ZYNQMP_DISP_AV_BUF_OUTPUT_VID1_SHIFT		0
+#define ZYNQMP_DISP_AV_BUF_OUTPUT_VID1_MASK		(0x3 << 0)
+#define ZYNQMP_DISP_AV_BUF_OUTPUT_VID1_LIVE		(0 << 0)
+#define ZYNQMP_DISP_AV_BUF_OUTPUT_VID1_MEM		(1 << 0)
+#define ZYNQMP_DISP_AV_BUF_OUTPUT_VID1_PATTERN		(2 << 0)
+#define ZYNQMP_DISP_AV_BUF_OUTPUT_VID1_NONE		(3 << 0)
+#define ZYNQMP_DISP_AV_BUF_OUTPUT_VID2_SHIFT		2
+#define ZYNQMP_DISP_AV_BUF_OUTPUT_VID2_MASK		(0x3 << 2)
+#define ZYNQMP_DISP_AV_BUF_OUTPUT_VID2_DISABLE		(0 << 2)
+#define ZYNQMP_DISP_AV_BUF_OUTPUT_VID2_MEM		(1 << 2)
+#define ZYNQMP_DISP_AV_BUF_OUTPUT_VID2_LIVE		(2 << 2)
+#define ZYNQMP_DISP_AV_BUF_OUTPUT_VID2_NONE		(3 << 2)
+#define ZYNQMP_DISP_AV_BUF_OUTPUT_AUD1_SHIFT		4
+#define ZYNQMP_DISP_AV_BUF_OUTPUT_AUD1_MASK		(0x3 << 4)
+#define ZYNQMP_DISP_AV_BUF_OUTPUT_AUD1_PL		(0 << 4)
+#define ZYNQMP_DISP_AV_BUF_OUTPUT_AUD1_MEM		(1 << 4)
+#define ZYNQMP_DISP_AV_BUF_OUTPUT_AUD1_PATTERN		(2 << 4)
+#define ZYNQMP_DISP_AV_BUF_OUTPUT_AUD1_DISABLE		(3 << 4)
+#define ZYNQMP_DISP_AV_BUF_OUTPUT_AUD2_EN		BIT(6)
+#define ZYNQMP_DISP_AV_BUF_HCOUNT_VCOUNT_INT0		0x74
+#define ZYNQMP_DISP_AV_BUF_HCOUNT_VCOUNT_INT1		0x78
+#define ZYNQMP_DISP_AV_BUF_PATTERN_GEN_SELECT		0x100
+#define ZYNQMP_DISP_AV_BUF_CLK_SRC			0x120
+#define ZYNQMP_DISP_AV_BUF_CLK_SRC_VID_FROM_PS		BIT(0)
+#define ZYNQMP_DISP_AV_BUF_CLK_SRC_AUD_FROM_PS		BIT(1)
+#define ZYNQMP_DISP_AV_BUF_CLK_SRC_VID_INTERNAL_TIMING	BIT(2)
+#define ZYNQMP_DISP_AV_BUF_SRST_REG			0x124
+#define ZYNQMP_DISP_AV_BUF_SRST_REG_VID_RST		BIT(1)
+#define ZYNQMP_DISP_AV_BUF_AUDIO_CH_CONFIG		0x12c
+#define ZYNQMP_DISP_AV_BUF_GFX_COMP_SF(n)		(0x200 + ((n) * 4))
+#define ZYNQMP_DISP_AV_BUF_VID_COMP_SF(n)		(0x20c + ((n) * 4))
+#define ZYNQMP_DISP_AV_BUF_LIVD_VID_COMP_SF(n)		(0x218 + ((n) * 4))
+#define ZYNQMP_DISP_AV_BUF_LIVE_VID_CONFIG		0x224
+#define ZYNQMP_DISP_AV_BUF_LIVD_GFX_COMP_SF(n)		(0x228 + ((n) * 4))
+#define ZYNQMP_DISP_AV_BUF_LIVE_GFX_CONFIG		0x234
+#define ZYNQMP_DISP_AV_BUF_4BIT_SF			0x11111
+#define ZYNQMP_DISP_AV_BUF_5BIT_SF			0x10842
+#define ZYNQMP_DISP_AV_BUF_6BIT_SF			0x10410
+#define ZYNQMP_DISP_AV_BUF_8BIT_SF			0x10101
+#define ZYNQMP_DISP_AV_BUF_10BIT_SF			0x10040
+#define ZYNQMP_DISP_AV_BUF_NULL_SF			0
+#define ZYNQMP_DISP_AV_BUF_NUM_SF			3
+#define ZYNQMP_DISP_AV_BUF_LIVE_CONFIG_BPC_6		0x0
+#define ZYNQMP_DISP_AV_BUF_LIVE_CONFIG_BPC_8		0x1
+#define ZYNQMP_DISP_AV_BUF_LIVE_CONFIG_BPC_10		0x2
+#define ZYNQMP_DISP_AV_BUF_LIVE_CONFIG_BPC_12		0x3
+#define ZYNQMP_DISP_AV_BUF_LIVE_CONFIG_BPC_MASK		GENMASK(2, 0)
+#define ZYNQMP_DISP_AV_BUF_LIVE_CONFIG_FMT_RGB		0x0
+#define ZYNQMP_DISP_AV_BUF_LIVE_CONFIG_FMT_YUV444	0x1
+#define ZYNQMP_DISP_AV_BUF_LIVE_CONFIG_FMT_YUV422	0x2
+#define ZYNQMP_DISP_AV_BUF_LIVE_CONFIG_FMT_YONLY	0x3
+#define ZYNQMP_DISP_AV_BUF_LIVE_CONFIG_FMT_MASK		GENMASK(5, 4)
+#define ZYNQMP_DISP_AV_BUF_LIVE_CONFIG_CB_FIRST		BIT(8)
+#define ZYNQMP_DISP_AV_BUF_PALETTE_MEMORY		0x400
+
+/* Audio registers */
+#define ZYNQMP_DISP_AUD_MIXER_VOLUME			0x0
+#define ZYNQMP_DISP_AUD_MIXER_VOLUME_NO_SCALE		0x20002000
+#define ZYNQMP_DISP_AUD_MIXER_META_DATA			0x4
+#define ZYNQMP_DISP_AUD_CH_STATUS0			0x8
+#define ZYNQMP_DISP_AUD_CH_STATUS1			0xc
+#define ZYNQMP_DISP_AUD_CH_STATUS2			0x10
+#define ZYNQMP_DISP_AUD_CH_STATUS3			0x14
+#define ZYNQMP_DISP_AUD_CH_STATUS4			0x18
+#define ZYNQMP_DISP_AUD_CH_STATUS5			0x1c
+#define ZYNQMP_DISP_AUD_CH_A_DATA0			0x20
+#define ZYNQMP_DISP_AUD_CH_A_DATA1			0x24
+#define ZYNQMP_DISP_AUD_CH_A_DATA2			0x28
+#define ZYNQMP_DISP_AUD_CH_A_DATA3			0x2c
+#define ZYNQMP_DISP_AUD_CH_A_DATA4			0x30
+#define ZYNQMP_DISP_AUD_CH_A_DATA5			0x34
+#define ZYNQMP_DISP_AUD_CH_B_DATA0			0x38
+#define ZYNQMP_DISP_AUD_CH_B_DATA1			0x3c
+#define ZYNQMP_DISP_AUD_CH_B_DATA2			0x40
+#define ZYNQMP_DISP_AUD_CH_B_DATA3			0x44
+#define ZYNQMP_DISP_AUD_CH_B_DATA4			0x48
+#define ZYNQMP_DISP_AUD_CH_B_DATA5			0x4c
+#define ZYNQMP_DISP_AUD_SOFT_RESET			0xc00
+#define ZYNQMP_DISP_AUD_SOFT_RESET_AUD_SRST		BIT(0)
+
+#endif /* _ZYNQMP_DISP_REGS_H_ */

drivers/gpu/drm/xlnx/zynqmp_dp.c

···
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ZynqMP DisplayPort Driver
+ *
+ * Copyright (C) 2017 - 2020 Xilinx, Inc.
+ *
+ * Authors:
+ * - Hyun Woo Kwon <[e-mail]>
+ * - Laurent Pinchart <[e-mail]>
+ */
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_connector.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_device.h>
+#include <drm/drm_dp_helper.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_encoder.h>
+#include <drm/drm_managed.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_of.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_simple_kms_helper.h>
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/phy/phy.h>
+#include <linux/reset.h>
+
+#include "zynqmp_disp.h"
+#include "zynqmp_dp.h"
+#include "zynqmp_dpsub.h"
+
+static uint zynqmp_dp_aux_timeout_ms = 50;
+module_param_named(aux_timeout_ms, zynqmp_dp_aux_timeout_ms, uint, 0444);
+MODULE_PARM_DESC(aux_timeout_ms, "DP aux timeout value in msec (default: 50)");
+
+/*
+ * Some sink requires a delay after power on request
+ */
+static uint zynqmp_dp_power_on_delay_ms = 4;
+module_param_named(power_on_delay_ms, zynqmp_dp_power_on_delay_ms, uint, 0444);
+MODULE_PARM_DESC(aux_timeout_ms, "DP power on delay in msec (default: 4)");
+
+/* Link configuration registers */
+#define ZYNQMP_DP_LINK_BW_SET				0x0
+#define ZYNQMP_DP_LANE_COUNT_SET			0x4
+#define ZYNQMP_DP_ENHANCED_FRAME_EN			0x8
+#define ZYNQMP_DP_TRAINING_PATTERN_SET			0xc
+#define ZYNQMP_DP_SCRAMBLING_DISABLE			0x14
+#define ZYNQMP_DP_DOWNSPREAD_CTL			0x18
+#define ZYNQMP_DP_SOFTWARE_RESET			0x1c
+#define ZYNQMP_DP_SOFTWARE_RESET_STREAM1		BIT(0)
+#define ZYNQMP_DP_SOFTWARE_RESET_STREAM2		BIT(1)
+#define ZYNQMP_DP_SOFTWARE_RESET_STREAM3		BIT(2)
+#define ZYNQMP_DP_SOFTWARE_RESET_STREAM4		BIT(3)
+#define ZYNQMP_DP_SOFTWARE_RESET_AUX			BIT(7)
+#define ZYNQMP_DP_SOFTWARE_RESET_ALL			(ZYNQMP_DP_SOFTWARE_RESET_STREAM1 | \
+							 ZYNQMP_DP_SOFTWARE_RESET_STREAM2 | \
+							 ZYNQMP_DP_SOFTWARE_RESET_STREAM3 | \
+							 ZYNQMP_DP_SOFTWARE_RESET_STREAM4 | \
+							 ZYNQMP_DP_SOFTWARE_RESET_AUX)
+
+/* Core enable registers */
+#define ZYNQMP_DP_TRANSMITTER_ENABLE			0x80
+#define ZYNQMP_DP_MAIN_STREAM_ENABLE			0x84
+#define ZYNQMP_DP_FORCE_SCRAMBLER_RESET			0xc0
+#define ZYNQMP_DP_VERSION				0xf8
+#define ZYNQMP_DP_VERSION_MAJOR_MASK			GENMASK(31, 24)
+#define ZYNQMP_DP_VERSION_MAJOR_SHIFT			24
+#define ZYNQMP_DP_VERSION_MINOR_MASK			GENMASK(23, 16)
+#define ZYNQMP_DP_VERSION_MINOR_SHIFT			16
+#define ZYNQMP_DP_VERSION_REVISION_MASK			GENMASK(15, 12)
+#define ZYNQMP_DP_VERSION_REVISION_SHIFT		12
+#define ZYNQMP_DP_VERSION_PATCH_MASK			GENMASK(11, 8)
+#define ZYNQMP_DP_VERSION_PATCH_SHIFT			8
+#define ZYNQMP_DP_VERSION_INTERNAL_MASK			GENMASK(7, 0)
+#define ZYNQMP_DP_VERSION_INTERNAL_SHIFT		0
+
+/* Core ID registers */
+#define ZYNQMP_DP_CORE_ID				0xfc
+#define ZYNQMP_DP_CORE_ID_MAJOR_MASK			GENMASK(31, 24)
+#define ZYNQMP_DP_CORE_ID_MAJOR_SHIFT			24
+#define ZYNQMP_DP_CORE_ID_MINOR_MASK			GENMASK(23, 16)
+#define ZYNQMP_DP_CORE_ID_MINOR_SHIFT			16
+#define ZYNQMP_DP_CORE_ID_REVISION_MASK			GENMASK(15, 8)
+#define ZYNQMP_DP_CORE_ID_REVISION_SHIFT		8
+#define ZYNQMP_DP_CORE_ID_DIRECTION			GENMASK(1)
+
+/* AUX channel interface registers */
+#define ZYNQMP_DP_AUX_COMMAND				0x100
+#define ZYNQMP_DP_AUX_COMMAND_CMD_SHIFT			8
+#define ZYNQMP_DP_AUX_COMMAND_ADDRESS_ONLY		BIT(12)
+#define ZYNQMP_DP_AUX_COMMAND_BYTES_SHIFT		0
+#define ZYNQMP_DP_AUX_WRITE_FIFO			0x104
+#define ZYNQMP_DP_AUX_ADDRESS				0x108
+#define ZYNQMP_DP_AUX_CLK_DIVIDER			0x10c
+#define ZYNQMP_DP_AUX_CLK_DIVIDER_AUX_FILTER_SHIFT	8
+#define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE		0x130
+#define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_HPD		BIT(0)
+#define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REQUEST	BIT(1)
+#define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY		BIT(2)
+#define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT	BIT(3)
+#define ZYNQMP_DP_AUX_REPLY_DATA			0x134
+#define ZYNQMP_DP_AUX_REPLY_CODE			0x138
+#define ZYNQMP_DP_AUX_REPLY_CODE_AUX_ACK		(0)
+#define ZYNQMP_DP_AUX_REPLY_CODE_AUX_NACK		BIT(0)
+#define ZYNQMP_DP_AUX_REPLY_CODE_AUX_DEFER		BIT(1)
+#define ZYNQMP_DP_AUX_REPLY_CODE_I2C_ACK		(0)
+#define ZYNQMP_DP_AUX_REPLY_CODE_I2C_NACK		BIT(2)
+#define ZYNQMP_DP_AUX_REPLY_CODE_I2C_DEFER		BIT(3)
+#define ZYNQMP_DP_AUX_REPLY_COUNT			0x13c
+#define ZYNQMP_DP_REPLY_DATA_COUNT			0x148
+#define ZYNQMP_DP_REPLY_DATA_COUNT_MASK			0xff
+#define ZYNQMP_DP_INT_STATUS				0x3a0
+#define ZYNQMP_DP_INT_MASK				0x3a4
+#define ZYNQMP_DP_INT_EN				0x3a8
+#define ZYNQMP_DP_INT_DS				0x3ac
+#define ZYNQMP_DP_INT_HPD_IRQ				BIT(0)
+#define ZYNQMP_DP_INT_HPD_EVENT				BIT(1)
+#define ZYNQMP_DP_INT_REPLY_RECEIVED			BIT(2)
+#define ZYNQMP_DP_INT_REPLY_TIMEOUT			BIT(3)
+#define ZYNQMP_DP_INT_HPD_PULSE_DET			BIT(4)
+#define ZYNQMP_DP_INT_EXT_PKT_TXD			BIT(5)
+#define ZYNQMP_DP_INT_LIV_ABUF_UNDRFLW			BIT(12)
+#define ZYNQMP_DP_INT_VBLANK_START			BIT(13)
+#define ZYNQMP_DP_INT_PIXEL1_MATCH			BIT(14)
+#define ZYNQMP_DP_INT_PIXEL0_MATCH			BIT(15)
+#define ZYNQMP_DP_INT_CHBUF_UNDERFLW_MASK		0x3f0000
+#define ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK		0xfc00000
+#define ZYNQMP_DP_INT_CUST_TS_2				BIT(28)
+#define ZYNQMP_DP_INT_CUST_TS				BIT(29)
+#define ZYNQMP_DP_INT_EXT_VSYNC_TS			BIT(30)
+#define ZYNQMP_DP_INT_VSYNC_TS				BIT(31)
+#define ZYNQMP_DP_INT_ALL				(ZYNQMP_DP_INT_HPD_IRQ | \
+							 ZYNQMP_DP_INT_HPD_EVENT | \
+							 ZYNQMP_DP_INT_CHBUF_UNDERFLW_MASK | \
+							 ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK)
+
+/* Main stream attribute registers */
+#define ZYNQMP_DP_MAIN_STREAM_HTOTAL			0x180
+#define ZYNQMP_DP_MAIN_STREAM_VTOTAL			0x184
+#define ZYNQMP_DP_MAIN_STREAM_POLARITY			0x188
+#define ZYNQMP_DP_MAIN_STREAM_POLARITY_HSYNC_SHIFT	0
+#define ZYNQMP_DP_MAIN_STREAM_POLARITY_VSYNC_SHIFT	1
+#define ZYNQMP_DP_MAIN_STREAM_HSWIDTH			0x18c
+#define ZYNQMP_DP_MAIN_STREAM_VSWIDTH			0x190
+#define ZYNQMP_DP_MAIN_STREAM_HRES			0x194
+#define ZYNQMP_DP_MAIN_STREAM_VRES			0x198
+#define ZYNQMP_DP_MAIN_STREAM_HSTART			0x19c
+#define ZYNQMP_DP_MAIN_STREAM_VSTART			0x1a0
+#define ZYNQMP_DP_MAIN_STREAM_MISC0			0x1a4
+#define ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK		BIT(0)
+#define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_RGB	(0 << 1)
+#define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_422	(5 << 1)
+#define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_444	(6 << 1)
+#define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_MASK	(7 << 1)
+#define ZYNQMP_DP_MAIN_STREAM_MISC0_DYNAMIC_RANGE	BIT(3)
+#define ZYNQMP_DP_MAIN_STREAM_MISC0_YCBCR_COLR		BIT(4)
+#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_6		(0 << 5)
+#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8		(1 << 5)
+#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_10		(2 << 5)
+#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_12		(3 << 5)
+#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_16		(4 << 5)
+#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_MASK		(7 << 5)
+#define ZYNQMP_DP_MAIN_STREAM_MISC1			0x1a8
+#define ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN		BIT(7)
+#define ZYNQMP_DP_MAIN_STREAM_M_VID			0x1ac
+#define ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE		0x1b0
+#define ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE_TU_SIZE_DEF	64
+#define ZYNQMP_DP_MAIN_STREAM_N_VID			0x1b4
+#define ZYNQMP_DP_USER_PIX_WIDTH			0x1b8
+#define ZYNQMP_DP_USER_DATA_COUNT_PER_LANE		0x1bc
+#define ZYNQMP_DP_MIN_BYTES_PER_TU			0x1c4
+#define ZYNQMP_DP_FRAC_BYTES_PER_TU			0x1c8
+#define ZYNQMP_DP_INIT_WAIT				0x1cc
+
+/* PHY configuration and status registers */
+#define ZYNQMP_DP_PHY_RESET				0x200
+#define ZYNQMP_DP_PHY_RESET_PHY_RESET			BIT(0)
+#define ZYNQMP_DP_PHY_RESET_GTTX_RESET			BIT(1)
+#define ZYNQMP_DP_PHY_RESET_PHY_PMA_RESET		BIT(8)
+#define ZYNQMP_DP_PHY_RESET_PHY_PCS_RESET		BIT(9)
+#define ZYNQMP_DP_PHY_RESET_ALL_RESET			(ZYNQMP_DP_PHY_RESET_PHY_RESET | \
+							 ZYNQMP_DP_PHY_RESET_GTTX_RESET | \
+							 ZYNQMP_DP_PHY_RESET_PHY_PMA_RESET | \
+							 ZYNQMP_DP_PHY_RESET_PHY_PCS_RESET)
+#define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_0		0x210
+#define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_1		0x214
+#define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_2		0x218
+#define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_3		0x21c
+#define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_0		0x220
+#define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_1		0x224
+#define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_2		0x228
+#define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_3		0x22c
+#define ZYNQMP_DP_PHY_CLOCK_SELECT			0x234
+#define ZYNQMP_DP_PHY_CLOCK_SELECT_1_62G		0x1
+#define ZYNQMP_DP_PHY_CLOCK_SELECT_2_70G		0x3
+#define ZYNQMP_DP_PHY_CLOCK_SELECT_5_40G		0x5
+#define ZYNQMP_DP_TX_PHY_POWER_DOWN			0x238
+#define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_0		BIT(0)
+#define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_1		BIT(1)
+#define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_2		BIT(2)
+#define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_3		BIT(3)
+#define ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL			0xf
+#define ZYNQMP_DP_PHY_PRECURSOR_LANE_0			0x23c
+#define ZYNQMP_DP_PHY_PRECURSOR_LANE_1			0x240
+#define ZYNQMP_DP_PHY_PRECURSOR_LANE_2			0x244
+#define ZYNQMP_DP_PHY_PRECURSOR_LANE_3			0x248
+#define ZYNQMP_DP_PHY_POSTCURSOR_LANE_0			0x24c
+#define ZYNQMP_DP_PHY_POSTCURSOR_LANE_1			0x250
+#define ZYNQMP_DP_PHY_POSTCURSOR_LANE_2			0x254
+#define ZYNQMP_DP_PHY_POSTCURSOR_LANE_3			0x258
+#define ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_0		0x24c
+#define ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_1		0x250
+#define ZYNQMP_DP_PHY_STATUS				0x280
+#define ZYNQMP_DP_PHY_STATUS_PLL_LOCKED_SHIFT		4
+#define ZYNQMP_DP_PHY_STATUS_FPGA_PLL_LOCKED		BIT(6)
+
+/* Audio registers */
+#define ZYNQMP_DP_TX_AUDIO_CONTROL			0x300
+#define ZYNQMP_DP_TX_AUDIO_CHANNELS			0x304
+#define ZYNQMP_DP_TX_AUDIO_INFO_DATA			0x308
+#define ZYNQMP_DP_TX_M_AUD				0x328
+#define ZYNQMP_DP_TX_N_AUD				0x32c
+#define ZYNQMP_DP_TX_AUDIO_EXT_DATA			0x330
+
+#define ZYNQMP_DP_MAX_LANES				2
+#define ZYNQMP_MAX_FREQ					3000000
+
+#define DP_REDUCED_BIT_RATE				162000
+#define DP_HIGH_BIT_RATE				270000
+#define DP_HIGH_BIT_RATE2				540000
+#define DP_MAX_TRAINING_TRIES				5
+#define DP_V1_2						0x12
+
+/**
+ * struct zynqmp_dp_link_config - Common link config between source and sink
+ * @max_rate: maximum link rate
+ * @max_lanes: maximum number of lanes
+ */
+struct zynqmp_dp_link_config {
+	int max_rate;
+	u8 max_lanes;
+};
+
+/**
+ * struct zynqmp_dp_mode - Configured mode of DisplayPort
+ * @bw_code: code for bandwidth(link rate)
+ * @lane_cnt: number of lanes
+ * @pclock: pixel clock frequency of current mode
+ * @fmt: format identifier string
+ */
+struct zynqmp_dp_mode {
+	u8 bw_code;
+	u8 lane_cnt;
+	int pclock;
+	const char *fmt;
+};
+
+/**
+ * struct zynqmp_dp_config - Configuration of DisplayPort from DTS
+ * @misc0: misc0 configuration (per DP v1.2 spec)
+ * @misc1: misc1 configuration (per DP v1.2 spec)
+ * @bpp: bits per pixel
+ */
+struct zynqmp_dp_config {
+	u8 misc0;
+	u8 misc1;
+	u8 bpp;
+};
+
+/**
+ * struct zynqmp_dp - Xilinx DisplayPort core
+ * @encoder: the drm encoder structure
+ * @connector: the drm connector structure
+ * @dev: device structure
+ * @dpsub: Display subsystem
+ * @drm: DRM core
+ * @iomem: device I/O memory for register access
+ * @reset: reset controller
+ * @irq: irq
+ * @config: IP core configuration from DTS
+ * @aux: aux channel
+ * @phy: PHY handles for DP lanes
+ * @num_lanes: number of enabled phy lanes
+ * @hpd_work: hot plug detection worker
+ * @status: connection status
+ * @enabled: flag to indicate if the device is enabled
+ * @dpcd: DP configuration data from currently connected sink device
+ * @link_config: common link configuration between IP core and sink device
+ * @mode: current mode between IP core and sink device
+ * @train_set: set of training data
+ */
+struct zynqmp_dp {
+	struct drm_encoder encoder;
+	struct drm_connector connector;
+	struct device *dev;
+	struct zynqmp_dpsub *dpsub;
+	struct drm_device *drm;
+	void __iomem *iomem;
+	struct reset_control *reset;
+	int irq;
+
+	struct zynqmp_dp_config config;
+	struct drm_dp_aux aux;
+	struct phy *phy[ZYNQMP_DP_MAX_LANES];
+	u8 num_lanes;
+	struct delayed_work hpd_work;
+	enum drm_connector_status status;
+	bool enabled;
+
+	u8 dpcd[DP_RECEIVER_CAP_SIZE];
+	struct zynqmp_dp_link_config link_config;
+	struct zynqmp_dp_mode mode;
+	u8 train_set[ZYNQMP_DP_MAX_LANES];
+};
+
+static inline struct zynqmp_dp *encoder_to_dp(struct drm_encoder *encoder)
+{
+	return container_of(encoder, struct zynqmp_dp, encoder);
+}
+
+static inline struct zynqmp_dp *connector_to_dp(struct drm_connector *connector)
+{
+	return container_of(connector, struct zynqmp_dp, connector);
+}
+
+static void zynqmp_dp_write(struct zynqmp_dp *dp, int offset, u32 val)
+{
+	writel(val, dp->iomem + offset);
+}
+
+static u32 zynqmp_dp_read(struct zynqmp_dp *dp, int offset)
+{
+	return readl(dp->iomem + offset);
+}
+
+static void zynqmp_dp_clr(struct zynqmp_dp *dp, int offset, u32 clr)
+{
+	zynqmp_dp_write(dp, offset, zynqmp_dp_read(dp, offset) & ~clr);
+}
+
+static void zynqmp_dp_set(struct zynqmp_dp *dp, int offset, u32 set)
+{
+	zynqmp_dp_write(dp, offset, zynqmp_dp_read(dp, offset) | set);
+}
+
+/* -----------------------------------------------------------------------------
+ * PHY Handling
+ */
+
+#define RST_TIMEOUT_MS			1000
+
+static int zynqmp_dp_reset(struct zynqmp_dp *dp, bool assert)
+{
+	unsigned long timeout;
+
+	if (assert)
+		reset_control_assert(dp->reset);
+	else
+		reset_control_deassert(dp->reset);
+
+	/* Wait for the (de)assert to complete. */
+	timeout = jiffies + msecs_to_jiffies(RST_TIMEOUT_MS);
+	while (!time_after_eq(jiffies, timeout)) {
+		bool status = !!reset_control_status(dp->reset);
+
+		if (assert == status)
+			return 0;
+
+		cpu_relax();
+	}
+
+	dev_err(dp->dev, "reset %s timeout\n", assert ? "assert" : "deassert");
+	return -ETIMEDOUT;
+}
+
+/**
+ * zynqmp_dp_phy_init - Initialize the phy
+ * @dp: DisplayPort IP core structure
+ *
+ * Initialize the phy.
+ *
+ * Return: 0 if the phy instances are initialized correctly, or the error code
+ * returned from the callee functions.
+ */
+static int zynqmp_dp_phy_init(struct zynqmp_dp *dp)
+{
+	int ret;
+	int i;
+
+	for (i = 0; i < dp->num_lanes; i++) {
+		ret = phy_init(dp->phy[i]);
+		if (ret) {
+			dev_err(dp->dev, "failed to init phy lane %d\n", i);
+			return ret;
+		}
+	}
+
+	ret = zynqmp_dp_reset(dp, false);
+	if (ret < 0)
+		return ret;
+
+	zynqmp_dp_clr(dp, ZYNQMP_DP_PHY_RESET, ZYNQMP_DP_PHY_RESET_ALL_RESET);
+
+	/*
+	 * Power on lanes in reverse order as only lane 0 waits for the PLL to
+	 * lock.
+	 */
+	for (i = dp->num_lanes - 1; i >= 0; i--) {
+		ret = phy_power_on(dp->phy[i]);
+		if (ret) {
+			dev_err(dp->dev, "failed to power on phy lane %d\n", i);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+/**
+ * zynqmp_dp_phy_exit - Exit the phy
+ * @dp: DisplayPort IP core structure
+ *
+ * Exit the phy.
+ */
+static void zynqmp_dp_phy_exit(struct zynqmp_dp *dp)
+{
+	unsigned int i;
+	int ret;
+
+	for (i = 0; i < dp->num_lanes; i++) {
+		ret = phy_power_off(dp->phy[i]);
+		if (ret)
+			dev_err(dp->dev, "failed to power off phy(%d) %d\n", i,
+				ret);
+	}
+
+	zynqmp_dp_reset(dp, true);
+
+	for (i = 0; i < dp->num_lanes; i++) {
+		ret = phy_exit(dp->phy[i]);
+		if (ret)
+			dev_err(dp->dev, "failed to exit phy(%d) %d\n", i, ret);
+	}
+}
+
+/**
+ * zynqmp_dp_phy_probe - Probe the PHYs
+ * @dp: DisplayPort IP core structure
+ *
+ * Probe PHYs for all lanes. Less PHYs may be available than the number of
+ * lanes, which is not considered an error as long as at least one PHY is
+ * found. The caller can check dp->num_lanes to check how many PHYs were found.
+ *
+ * Return:
+ * * 0				- Success
+ * * -ENXIO			- No PHY found
+ * * -EPROBE_DEFER		- Probe deferral requested
+ * * Other negative value	- PHY retrieval failure
+ */
+static int zynqmp_dp_phy_probe(struct zynqmp_dp *dp)
+{
+	unsigned int i;
+
+	for (i = 0; i < ZYNQMP_DP_MAX_LANES; i++) {
+		char phy_name[16];
+		struct phy *phy;
+
+		snprintf(phy_name, sizeof(phy_name), "dp-phy%d", i);
+		phy = devm_phy_get(dp->dev, phy_name);
+
+		if (IS_ERR(phy)) {
+			switch (PTR_ERR(phy)) {
+			case -ENODEV:
+				if (dp->num_lanes)
+					return 0;
+
+				dev_err(dp->dev, "no PHY found\n");
+				return -ENXIO;
+
+			case -EPROBE_DEFER:
+				return -EPROBE_DEFER;
+
+			default:
+				dev_err(dp->dev, "failed to get PHY lane %u\n",
+					i);
+				return PTR_ERR(phy);
+			}
+		}
+
+		dp->phy[i] = phy;
+		dp->num_lanes++;
+	}
+
+	return 0;
+}
+
+/**
+ * zynqmp_dp_phy_ready - Check if PHY is ready
+ * @dp: DisplayPort IP core structure
+ *
+ * Check if PHY is ready. If PHY is not ready, wait 1ms to check for 100 times.
+ * This amount of delay was suggested by IP designer.
+ *
+ * Return: 0 if PHY is ready, or -ENODEV if PHY is not ready.
+ */
+static int zynqmp_dp_phy_ready(struct zynqmp_dp *dp)
+{
+	u32 i, reg, ready;
+
+	ready = (1 << dp->num_lanes) - 1;
+
+	/* Wait for 100 * 1ms. This should be enough time for PHY to be ready */
+	for (i = 0; ; i++) {
+		reg = zynqmp_dp_read(dp, ZYNQMP_DP_PHY_STATUS);
+		if ((reg & ready) == ready)
+			return 0;
+
+		if (i == 100) {
+			dev_err(dp->dev, "PHY isn't ready\n");
+			return -ENODEV;
+		}
+
+		usleep_range(1000, 1100);
+	}
+
+	return 0;
+}
+
+/* -----------------------------------------------------------------------------
+ * DisplayPort Link Training
+ */
+
+/**
+ * zynqmp_dp_max_rate - Calculate and return available max pixel clock
+ * @link_rate: link rate (Kilo-bytes / sec)
+ * @lane_num: number of lanes
+ * @bpp: bits per pixel
+ *
+ * Return: max pixel clock (KHz) supported by current link config.
+ */
+static inline int zynqmp_dp_max_rate(int link_rate, u8 lane_num, u8 bpp)
+{
+	return link_rate * lane_num * 8 / bpp;
+}
+
+/**
+ * zynqmp_dp_mode_configure - Configure the link values
+ * @dp: DisplayPort IP core structure
+ * @pclock: pixel clock for requested display mode
+ * @current_bw: current link rate
+ *
+ * Find the link configuration values, rate and lane count for requested pixel
+ * clock @pclock. The @pclock is stored in the mode to be used in other
+ * functions later. The returned rate is downshifted from the current rate
+ * @current_bw.
+ *
+ * Return: Current link rate code, or -EINVAL.
+ */
+static int zynqmp_dp_mode_configure(struct zynqmp_dp *dp, int pclock,
+				    u8 current_bw)
+{
+	int max_rate = dp->link_config.max_rate;
+	u8 bws[3] = { DP_LINK_BW_1_62, DP_LINK_BW_2_7, DP_LINK_BW_5_4 };
+	u8 max_lanes = dp->link_config.max_lanes;
+	u8 max_link_rate_code = drm_dp_link_rate_to_bw_code(max_rate);
+	u8 bpp = dp->config.bpp;
+	u8 lane_cnt;
+	s8 i;
+
+	if (current_bw == DP_LINK_BW_1_62) {
+		dev_err(dp->dev, "can't downshift. already lowest link rate\n");
+		return -EINVAL;
+	}
+
+	for (i = ARRAY_SIZE(bws) - 1; i >= 0; i--) {
+		if (current_bw && bws[i] >= current_bw)
+			continue;
+
+		if (bws[i] <= max_link_rate_code)
+			break;
+	}
+
+	for (lane_cnt = 1; lane_cnt <= max_lanes; lane_cnt <<= 1) {
+		int bw;
+		u32 rate;
+
+		bw = drm_dp_bw_code_to_link_rate(bws[i]);
+		rate = zynqmp_dp_max_rate(bw, lane_cnt, bpp);
+		if (pclock <= rate) {
+			dp->mode.bw_code = bws[i];
+			dp->mode.lane_cnt = lane_cnt;
+			dp->mode.pclock = pclock;
+			return dp->mode.bw_code;
+		}
+	}
+
+	dev_err(dp->dev, "failed to configure link values\n");
+
+	return -EINVAL;
+}
+
+/**
+ * zynqmp_dp_adjust_train - Adjust train values
+ * @dp: DisplayPort IP core structure
+ * @link_status: link status from sink which contains requested training values
+ */
+static void zynqmp_dp_adjust_train(struct zynqmp_dp *dp,
+				   u8 link_status[DP_LINK_STATUS_SIZE])
+{
+	u8 *train_set = dp->train_set;
+	u8 voltage = 0, preemphasis = 0;
+	u8 i;
+
+	for (i = 0; i < dp->mode.lane_cnt; i++) {
+		u8 v = drm_dp_get_adjust_request_voltage(link_status, i);
+		u8 p = drm_dp_get_adjust_request_pre_emphasis(link_status, i);
+
+		if (v > voltage)
+			voltage = v;
+
+		if (p > preemphasis)
+			preemphasis = p;
+	}
+
+	if (voltage >= DP_TRAIN_VOLTAGE_SWING_LEVEL_3)
+		voltage |= DP_TRAIN_MAX_SWING_REACHED;
+
+	if (preemphasis >= DP_TRAIN_PRE_EMPH_LEVEL_2)
+		preemphasis |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
+
+	for (i = 0; i < dp->mode.lane_cnt; i++)
+		train_set[i] = voltage | preemphasis;
+}
+
+/**
+ * zynqmp_dp_update_vs_emph - Update the training values
+ * @dp: DisplayPort IP core structure
+ *
+ * Update the training values based on the request from sink. The mapped values
+ * are predefined, and values(vs, pe, pc) are from the device manual.
+ *
+ * Return: 0 if vs and emph are updated successfully, or the error code returned
+ * by drm_dp_dpcd_write().
+ */
+static int zynqmp_dp_update_vs_emph(struct zynqmp_dp *dp)
+{
+	unsigned int i;
+	int ret;
+
+	ret = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET, dp->train_set,
+				dp->mode.lane_cnt);
+	if (ret < 0)
+		return ret;
+
+	for (i = 0; i < dp->mode.lane_cnt; i++) {
+		u32 reg = ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_0 + i * 4;
+		union phy_configure_opts opts = { 0 };
+		u8 train = dp->train_set[i];
+
+		opts.dp.voltage[0] = (train & DP_TRAIN_VOLTAGE_SWING_MASK)
+				   >> DP_TRAIN_VOLTAGE_SWING_SHIFT;
+		opts.dp.pre[0] = (train & DP_TRAIN_PRE_EMPHASIS_MASK)
+			       >> DP_TRAIN_PRE_EMPHASIS_SHIFT;
+
+		phy_configure(dp->phy[i], &opts);
+
+		zynqmp_dp_write(dp, reg, 0x2);
+	}
+
+	return 0;
+}
+
+/**
+ * zynqmp_dp_link_train_cr - Train clock recovery
+ * @dp: DisplayPort IP core structure
+ *
+ * Return: 0 if clock recovery train is done successfully, or corresponding
+ * error code.
+ */
+static int zynqmp_dp_link_train_cr(struct zynqmp_dp *dp)
+{
+	u8 link_status[DP_LINK_STATUS_SIZE];
+	u8 lane_cnt = dp->mode.lane_cnt;
+	u8 vs = 0, tries = 0;
+	u16 max_tries, i;
+	bool cr_done;
+	int ret;
+
+	zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET,
+			DP_TRAINING_PATTERN_1);
+	ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
+				 DP_TRAINING_PATTERN_1 |
+				 DP_LINK_SCRAMBLING_DISABLE);
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * 256 loops should be maximum iterations for 4 lanes and 4 values.
+	 * So, This loop should exit before 512 iterations
+	 */
+	for (max_tries = 0; max_tries < 512; max_tries++) {
+		ret = zynqmp_dp_update_vs_emph(dp);
+		if (ret)
+			return ret;
+
+		drm_dp_link_train_clock_recovery_delay(dp->dpcd);
+		ret = drm_dp_dpcd_read_link_status(&dp->aux, link_status);
+		if (ret < 0)
+			return ret;
+
+		cr_done = drm_dp_clock_recovery_ok(link_status, lane_cnt);
+		if (cr_done)
+			break;
+
+		for (i = 0; i < lane_cnt; i++)
+			if (!(dp->train_set[i] & DP_TRAIN_MAX_SWING_REACHED))
+				break;
+		if (i == lane_cnt)
+			break;
+
+		if ((dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == vs)
+			tries++;
+		else
+			tries = 0;
+
+		if (tries == DP_MAX_TRAINING_TRIES)
+			break;
+
+		vs = dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
+		zynqmp_dp_adjust_train(dp, link_status);
+	}
+
+	if (!cr_done)
+		return -EIO;
+
+	return 0;
+}
+
+/**
+ * zynqmp_dp_link_train_ce - Train channel equalization
+ * @dp: DisplayPort IP core structure
+ *
+ * Return: 0 if channel equalization train is done successfully, or
+ * corresponding error code.
+ */
+static int zynqmp_dp_link_train_ce(struct zynqmp_dp *dp)
+{
+	u8 link_status[DP_LINK_STATUS_SIZE];
+	u8 lane_cnt = dp->mode.lane_cnt;
+	u32 pat, tries;
+	int ret;
+	bool ce_done;
+
+	if (dp->dpcd[DP_DPCD_REV] >= DP_V1_2 &&
+	    dp->dpcd[DP_MAX_LANE_COUNT] & DP_TPS3_SUPPORTED)
+		pat = DP_TRAINING_PATTERN_3;
+	else
+		pat = DP_TRAINING_PATTERN_2;
+
+	zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET, pat);
+	ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
+				 pat | DP_LINK_SCRAMBLING_DISABLE);
+	if (ret < 0)
+		return ret;
+
+	for (tries = 0; tries < DP_MAX_TRAINING_TRIES; tries++) {
+		ret = zynqmp_dp_update_vs_emph(dp);
+		if (ret)
+			return ret;
+
+		drm_dp_link_train_channel_eq_delay(dp->dpcd);
+		ret = drm_dp_dpcd_read_link_status(&dp->aux, link_status);
+		if (ret < 0)
+			return ret;
+
+		ce_done = drm_dp_channel_eq_ok(link_status, lane_cnt);
+		if (ce_done)
+			break;
+
+		zynqmp_dp_adjust_train(dp, link_status);
+	}
+
+	if (!ce_done)
+		return -EIO;
+
+	return 0;
+}
+
+/**
+ * zynqmp_dp_link_train - Train the link
+ * @dp: DisplayPort IP core structure
+ *
+ * Return: 0 if all trains are done successfully, or corresponding error code.
+ */
+static int zynqmp_dp_train(struct zynqmp_dp *dp)
+{
+	u32 reg;
+	u8 bw_code = dp->mode.bw_code;
+	u8 lane_cnt = dp->mode.lane_cnt;
+	u8 aux_lane_cnt = lane_cnt;
+	bool enhanced;
+	int ret;
+
+	zynqmp_dp_write(dp, ZYNQMP_DP_LANE_COUNT_SET, lane_cnt);
+	enhanced = drm_dp_enhanced_frame_cap(dp->dpcd);
+	if (enhanced) {
+		zynqmp_dp_write(dp, ZYNQMP_DP_ENHANCED_FRAME_EN, 1);
+		aux_lane_cnt |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
+	}
+
+	if (dp->dpcd[3] & 0x1) {
+		zynqmp_dp_write(dp, ZYNQMP_DP_DOWNSPREAD_CTL, 1);
+		drm_dp_dpcd_writeb(&dp->aux, DP_DOWNSPREAD_CTRL,
+				   DP_SPREAD_AMP_0_5);
+	} else {
+		zynqmp_dp_write(dp, ZYNQMP_DP_DOWNSPREAD_CTL, 0);
+		drm_dp_dpcd_writeb(&dp->aux, DP_DOWNSPREAD_CTRL, 0);
+	}
+
+	ret = drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET, aux_lane_cnt);
+	if (ret < 0) {
+		dev_err(dp->dev, "failed to set lane count\n");
+		return ret;
+	}
+
+	ret = drm_dp_dpcd_writeb(&dp->aux, DP_MAIN_LINK_CHANNEL_CODING_SET,
+				 DP_SET_ANSI_8B10B);
+	if (ret < 0) {
+		dev_err(dp->dev, "failed to set ANSI 8B/10B encoding\n");
+		return ret;
+	}
+
+	ret = drm_dp_dpcd_writeb(&dp->aux, DP_LINK_BW_SET, bw_code);
+	if (ret < 0) {
+		dev_err(dp->dev, "failed to set DP bandwidth\n");
+		return ret;
+	}
+
+	zynqmp_dp_write(dp, ZYNQMP_DP_LINK_BW_SET, bw_code);
+	switch (bw_code) {
+	case DP_LINK_BW_1_62:
+		reg = ZYNQMP_DP_PHY_CLOCK_SELECT_1_62G;
+		break;
+	case DP_LINK_BW_2_7:
+		reg = ZYNQMP_DP_PHY_CLOCK_SELECT_2_70G;
+		break;
+	case DP_LINK_BW_5_4:
+	default:
+		reg = ZYNQMP_DP_PHY_CLOCK_SELECT_5_40G;
+		break;
+	}
+
+	zynqmp_dp_write(dp, ZYNQMP_DP_PHY_CLOCK_SELECT, reg);
+	ret = zynqmp_dp_phy_ready(dp);
+	if (ret < 0)
+		return ret;
+
+	zynqmp_dp_write(dp, ZYNQMP_DP_SCRAMBLING_DISABLE, 1);
+	memset(dp->train_set, 0, 4);
+	ret = zynqmp_dp_link_train_cr(dp);
+	if (ret)
+		return ret;
+
+	ret = zynqmp_dp_link_train_ce(dp);
+	if (ret)
+		return ret;
+
+	ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
+				 DP_TRAINING_PATTERN_DISABLE);
+	if (ret < 0) {
+		dev_err(dp->dev, "failed to disable training pattern\n");
+		return ret;
+	}
+	zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET,
+			DP_TRAINING_PATTERN_DISABLE);
+
+	zynqmp_dp_write(dp, ZYNQMP_DP_SCRAMBLING_DISABLE, 0);
+
+	return 0;
+}
+
+/**
+ * zynqmp_dp_train_loop - Downshift the link rate during training
+ * @dp: DisplayPort IP core structure
+ *
+ * Train the link by downshifting the link rate if training is not successful.
+ */
+static void zynqmp_dp_train_loop(struct zynqmp_dp *dp)
+{
+	struct zynqmp_dp_mode *mode = &dp->mode;
+	u8 bw = mode->bw_code;
+	int ret;
+
+	do {
+		if (dp->status == connector_status_disconnected ||
+		    !dp->enabled)
+			return;
+
+		ret = zynqmp_dp_train(dp);
+		if (!ret)
+			return;
+
+		ret = zynqmp_dp_mode_configure(dp, mode->pclock, bw);
+		if (ret < 0)
+			goto err_out;
+
+		bw = ret;
+	} while (bw >= DP_LINK_BW_1_62);
+
+err_out:
+	dev_err(dp->dev, "failed to train the DP link\n");
+}
+
+/* -----------------------------------------------------------------------------
+ * DisplayPort AUX
+ */
+
+#define AUX_READ_BIT	0x1
+
+/**
+ * zynqmp_dp_aux_cmd_submit - Submit aux command
+ * @dp: DisplayPort IP core structure
+ * @cmd: aux command
+ * @addr: aux address
+ * @buf: buffer for command data
+ * @bytes: number of bytes for @buf
+ * @reply: reply code to be returned
+ *
+ * Submit an aux command. All aux related commands, native or i2c aux
+ * read/write, are submitted through this function. The function is mapped to
+ * the transfer function of struct drm_dp_aux. This function involves in
+ * multiple register reads/writes, thus synchronization is needed, and it is
+ * done by drm_dp_helper using @hw_mutex. The calling thread goes into sleep
+ * if there's no immediate reply to the command submission. The reply code is
+ * returned at @reply if @reply != NULL.
+ *
+ * Return: 0 if the command is submitted properly, or corresponding error code:
+ * -EBUSY when there is any request already being processed
+ * -ETIMEDOUT when receiving reply is timed out
+ * -EIO when received bytes are less than requested
+ */
+static int zynqmp_dp_aux_cmd_submit(struct zynqmp_dp *dp, u32 cmd, u16 addr,
+				    u8 *buf, u8 bytes, u8 *reply)
+{
+	bool is_read = (cmd & AUX_READ_BIT) ? true : false;
+	u32 reg, i;
+
+	reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE);
+	if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REQUEST)
+		return -EBUSY;
+
+	zynqmp_dp_write(dp, ZYNQMP_DP_AUX_ADDRESS, addr);
+	if (!is_read)
+		for (i = 0; i < bytes; i++)
+			zynqmp_dp_write(dp, ZYNQMP_DP_AUX_WRITE_FIFO,
+					buf[i]);
+
+	reg = cmd << ZYNQMP_DP_AUX_COMMAND_CMD_SHIFT;
+	if (!buf || !bytes)
+		reg |= ZYNQMP_DP_AUX_COMMAND_ADDRESS_ONLY;
+	else
+		reg |= (bytes - 1) << ZYNQMP_DP_AUX_COMMAND_BYTES_SHIFT;
+	zynqmp_dp_write(dp, ZYNQMP_DP_AUX_COMMAND, reg);
+
+	/* Wait for reply to be delivered upto 2ms */
+	for (i = 0; ; i++) {
+		reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE);
+		if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY)
+			break;
+
+		if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT ||
+		    i == 2)
+			return -ETIMEDOUT;
+
+		usleep_range(1000, 1100);
+	}
+
+	reg = zynqmp_dp_read(dp, ZYNQMP_DP_AUX_REPLY_CODE);
+	if (reply)
+		*reply = reg;
+
+	if (is_read &&
+	    (reg == ZYNQMP_DP_AUX_REPLY_CODE_AUX_ACK ||
+	     reg == ZYNQMP_DP_AUX_REPLY_CODE_I2C_ACK)) {
+		reg = zynqmp_dp_read(dp, ZYNQMP_DP_REPLY_DATA_COUNT);
+		if ((reg & ZYNQMP_DP_REPLY_DATA_COUNT_MASK) != bytes)
+			return -EIO;
+
+		for (i = 0; i < bytes; i++)
+			buf[i] = zynqmp_dp_read(dp, ZYNQMP_DP_AUX_REPLY_DATA);
+	}
+
+	return 0;
+}
+
+static ssize_t
+zynqmp_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
+{
+	struct zynqmp_dp *dp = container_of(aux, struct zynqmp_dp, aux);
+	int ret;
+	unsigned int i, iter;
+
+	/* Number of loops = timeout in msec / aux delay (400 usec) */
+	iter = zynqmp_dp_aux_timeout_ms * 1000 / 400;
+	iter = iter ? iter : 1;
+
+	for (i = 0; i < iter; i++) {
+		ret = zynqmp_dp_aux_cmd_submit(dp, msg->request, msg->address,
+					       msg->buffer, msg->size,
+					       &msg->reply);
+		if (!ret) {
+			dev_dbg(dp->dev, "aux %d retries\n", i);
+			return msg->size;
+		}
+
+		if (dp->status == connector_status_disconnected) {
+			dev_dbg(dp->dev, "no connected aux device\n");
+			return -ENODEV;
+		}
+
+		usleep_range(400, 500);
+	}
+
+	dev_dbg(dp->dev, "failed to do aux transfer (%d)\n", ret);
+
+	return ret;
+}
+
+/**
+ * zynqmp_dp_aux_init - Initialize and register the DP AUX
+ * @dp: DisplayPort IP core structure
+ *
+ * Program the AUX clock divider and filter and register the DP AUX adapter.
+ *
+ * Return: 0 on success, error value otherwise
+ */
+static int zynqmp_dp_aux_init(struct zynqmp_dp *dp)
+{
+	unsigned long rate;
+	unsigned int w;
+
+	/*
+	 * The AUX_SIGNAL_WIDTH_FILTER is the number of APB clock cycles
+	 * corresponding to the AUX pulse. Allowable values are 8, 16, 24, 32,
+	 * 40 and 48. The AUX pulse width must be between 0.4µs and 0.6µs,
+	 * compute the w / 8 value corresponding to 0.4µs rounded up, and make
+	 * sure it stays below 0.6µs and within the allowable values.
+	 */
+	rate = clk_get_rate(dp->dpsub->apb_clk);
+	w = DIV_ROUND_UP(4 * rate, 1000 * 1000 * 10 * 8) * 8;
+	if (w > 6 * rate / (1000 * 1000 * 10) || w > 48) {
+		dev_err(dp->dev, "aclk frequency too high\n");
+		return -EINVAL;
+	}
+
+	zynqmp_dp_write(dp, ZYNQMP_DP_AUX_CLK_DIVIDER,
+			(w << ZYNQMP_DP_AUX_CLK_DIVIDER_AUX_FILTER_SHIFT) |
+			(rate / (1000 * 1000)));
+
+	dp->aux.name = "ZynqMP DP AUX";
+	dp->aux.dev = dp->dev;
+	dp->aux.transfer = zynqmp_dp_aux_transfer;
+
+	return drm_dp_aux_register(&dp->aux);
+}
+
+/**
+ * zynqmp_dp_aux_cleanup - Cleanup the DP AUX
+ * @dp: DisplayPort IP core structure
+ *
+ * Unregister the DP AUX adapter.
+ */
+static void zynqmp_dp_aux_cleanup(struct zynqmp_dp *dp)
+{
+	drm_dp_aux_unregister(&dp->aux);
+}
+
+/* -----------------------------------------------------------------------------
+ * DisplayPort Generic Support
+ */
+
+/**
+ * zynqmp_dp_update_misc - Write the misc registers
+ * @dp: DisplayPort IP core structure
+ *
+ * The misc register values are stored in the structure, and this
+ * function applies the values into the registers.
+ */
+static void zynqmp_dp_update_misc(struct zynqmp_dp *dp)
+{
+	zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_MISC0, dp->config.misc0);
+	zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_MISC1, dp->config.misc1);
+}
+
+/**
+ * zynqmp_dp_set_format - Set the input format
+ * @dp: DisplayPort IP core structure
+ * @format: input format
+ * @bpc: bits per component
+ *
+ * Update misc register values based on input @format and @bpc.
+ *
+ * Return: 0 on success, or -EINVAL.
+ */
+static int zynqmp_dp_set_format(struct zynqmp_dp *dp,
+				enum zynqmp_dpsub_format format,
+				unsigned int bpc)
+{
+	static const struct drm_display_info *display;
+	struct zynqmp_dp_config *config = &dp->config;
+	unsigned int num_colors;
+
+	config->misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_MASK;
+	config->misc1 &= ~ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN;
+
+	switch (format) {
+	case ZYNQMP_DPSUB_FORMAT_RGB:
+		config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_RGB;
+		num_colors = 3;
+		break;
+
+	case ZYNQMP_DPSUB_FORMAT_YCRCB444:
+		config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_444;
+		num_colors = 3;
+		break;
+
+	case ZYNQMP_DPSUB_FORMAT_YCRCB422:
+		config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_422;
+		num_colors = 2;
+		break;
+
+	case ZYNQMP_DPSUB_FORMAT_YONLY:
+		config->misc1 |= ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN;
+		num_colors = 1;
+		break;
+
+	default:
+		dev_err(dp->dev, "Invalid colormetry in DT\n");
+		return -EINVAL;
+	}
+
+	display = &dp->connector.display_info;
+	if (display->bpc && bpc > display->bpc) {
+		dev_warn(dp->dev,
+			 "downgrading requested %ubpc to display limit %ubpc\n",
+			 bpc, display->bpc);
+		bpc = display->bpc;
+	}
+
+	config->misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_MASK;
+
+	switch (bpc) {
+	case 6:
+		config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_6;
+		break;
+	case 8:
+		config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8;
+		break;
+	case 10:
+		config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_10;
+		break;
+	case 12:
+		config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_12;
+		break;
+	case 16:
+		config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_16;
+		break;
+	default:
+		dev_warn(dp->dev, "Not supported bpc (%u). fall back to 8bpc\n",
+			 bpc);
+		config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8;
+		bpc = 8;
+		break;
+	}
+
+	/* Update the current bpp based on the format. */
+	config->bpp = bpc * num_colors;
+
+	return 0;
+}
+
+/**
+ * zynqmp_dp_encoder_mode_set_transfer_unit - Set the transfer unit values
+ * @dp: DisplayPort IP core structure
+ * @mode: requested display mode
+ *
+ * Set the transfer unit, and calculate all transfer unit size related values.
+ * Calculation is based on DP and IP core specification.
+ */
+static void
+zynqmp_dp_encoder_mode_set_transfer_unit(struct zynqmp_dp *dp,
+					 struct drm_display_mode *mode)
+{
+	u32 tu = ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE_TU_SIZE_DEF;
+	u32 bw, vid_kbytes, avg_bytes_per_tu, init_wait;
+
+	/* Use the max transfer unit size (default) */
+	zynqmp_dp_write(dp, ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE, tu);
+
+	vid_kbytes = mode->clock * (dp->config.bpp / 8);
+	bw = drm_dp_bw_code_to_link_rate(dp->mode.bw_code);
+	avg_bytes_per_tu = vid_kbytes * tu / (dp->mode.lane_cnt * bw / 1000);
+	zynqmp_dp_write(dp, ZYNQMP_DP_MIN_BYTES_PER_TU,
+			avg_bytes_per_tu / 1000);
+	zynqmp_dp_write(dp, ZYNQMP_DP_FRAC_BYTES_PER_TU,
+			avg_bytes_per_tu % 1000);
+
+	/* Configure the initial wait cycle based on transfer unit size */
+	if (tu < (avg_bytes_per_tu / 1000))
+		init_wait = 0;
+	else if ((avg_bytes_per_tu / 1000) <= 4)
+		init_wait = tu;
+	else
+		init_wait = tu - avg_bytes_per_tu / 1000;
+
+	zynqmp_dp_write(dp, ZYNQMP_DP_INIT_WAIT, init_wait);
+}
+
+/**
+ * zynqmp_dp_encoder_mode_set_stream - Configure the main stream
+ * @dp: DisplayPort IP core structure
+ * @mode: requested display mode
+ *
+ * Configure the main stream based on the requested mode @mode. Calculation is
+ * based on IP core specification.
+ */
+static void zynqmp_dp_encoder_mode_set_stream(struct zynqmp_dp *dp,
+					      const struct drm_display_mode *mode)
+{
+	u8 lane_cnt = dp->mode.lane_cnt;
+	u32 reg, wpl;
+	unsigned int rate;
+
+	zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HTOTAL, mode->htotal);
+	zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VTOTAL, mode->vtotal);
+	zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_POLARITY,
+			(!!(mode->flags & DRM_MODE_FLAG_PVSYNC) <<
+			 ZYNQMP_DP_MAIN_STREAM_POLARITY_VSYNC_SHIFT) |
+			(!!(mode->flags & DRM_MODE_FLAG_PHSYNC) <<
+			 ZYNQMP_DP_MAIN_STREAM_POLARITY_HSYNC_SHIFT));
+	zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HSWIDTH,
+			mode->hsync_end - mode->hsync_start);
+	zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VSWIDTH,
+			mode->vsync_end - mode->vsync_start);
+	zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HRES, mode->hdisplay);
+	zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VRES, mode->vdisplay);
+	zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HSTART,
+			mode->htotal - mode->hsync_start);
+	zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VSTART,
+			mode->vtotal - mode->vsync_start);
+
+	/* In synchronous mode, set the diviers */
+	if (dp->config.misc0 & ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK) {
+		reg = drm_dp_bw_code_to_link_rate(dp->mode.bw_code);
+		zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_N_VID, reg);
+		zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_M_VID, mode->clock);
+		rate = zynqmp_disp_get_audio_clk_rate(dp->dpsub->disp);
+		if (rate) {
+			dev_dbg(dp->dev, "Audio rate: %d\n", rate / 512);
+			zynqmp_dp_write(dp, ZYNQMP_DP_TX_N_AUD, reg);
+			zynqmp_dp_write(dp, ZYNQMP_DP_TX_M_AUD, rate / 1000);
+		}
+	}
+
+	/* Only 2 channel audio is supported now */
+	if (zynqmp_disp_audio_enabled(dp->dpsub->disp))
+		zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CHANNELS, 1);
+
+	zynqmp_dp_write(dp, ZYNQMP_DP_USER_PIX_WIDTH, 1);
+
+	/* Translate to the native 16 bit datapath based on IP core spec */
+	wpl = (mode->hdisplay * dp->config.bpp + 15) / 16;
+	reg = wpl + wpl % lane_cnt - lane_cnt;
+	zynqmp_dp_write(dp, ZYNQMP_DP_USER_DATA_COUNT_PER_LANE, reg);
+}
+
+/* -----------------------------------------------------------------------------
+ * DRM Connector
+ */
+
+static enum drm_connector_status
+zynqmp_dp_connector_detect(struct drm_connector *connector, bool force)
+{
+	struct zynqmp_dp *dp = connector_to_dp(connector);
+	struct zynqmp_dp_link_config *link_config = &dp->link_config;
+	u32 state, i;
+	int ret;
+
+	/*
+	 * This is from heuristic. It takes some delay (ex, 100 ~ 500 msec) to
+	 * get the HPD signal with some monitors.
+	 */
+	for (i = 0; i < 10; i++) {
+		state = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE);
+		if (state & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_HPD)
+			break;
+		msleep(100);
+	}
+
+	if (state & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_HPD) {
+		ret = drm_dp_dpcd_read(&dp->aux, 0x0, dp->dpcd,
+				       sizeof(dp->dpcd));
+		if (ret < 0) {
+			dev_dbg(dp->dev, "DPCD read failes");
+			goto disconnected;
+		}
+
+		link_config->max_rate = min_t(int,
+					      drm_dp_max_link_rate(dp->dpcd),
+					      DP_HIGH_BIT_RATE2);
+		link_config->max_lanes = min_t(u8,
+					       drm_dp_max_lane_count(dp->dpcd),
+					       dp->num_lanes);
+
+		dp->status = connector_status_connected;
+		return connector_status_connected;
+	}
+
+disconnected:
+	dp->status = connector_status_disconnected;
+	return connector_status_disconnected;
+}
+
+static int zynqmp_dp_connector_get_modes(struct drm_connector *connector)
+{
+	struct zynqmp_dp *dp = connector_to_dp(connector);
+	struct edid *edid;
+	int ret;
+
+	edid = drm_get_edid(connector, &dp->aux.ddc);
+	if (!edid)
+		return 0;
+
+	drm_connector_update_edid_property(connector, edid);
+	ret = drm_add_edid_modes(connector, edid);
+	kfree(edid);
+
+	return ret;
+}
+
+static struct drm_encoder *
+zynqmp_dp_connector_best_encoder(struct drm_connector *connector)
+{
+	struct zynqmp_dp *dp = connector_to_dp(connector);
+
+	return &dp->encoder;
+}
+
+static int zynqmp_dp_connector_mode_valid(struct drm_connector *connector,
+					  struct drm_display_mode *mode)
+{
+	struct zynqmp_dp *dp = connector_to_dp(connector);
+	u8 max_lanes = dp->link_config.max_lanes;
+	u8 bpp = dp->config.bpp;
+	int max_rate = dp->link_config.max_rate;
+	int rate;
+
+	if (mode->clock > ZYNQMP_MAX_FREQ) {
+		dev_dbg(dp->dev, "filtered the mode, %s,for high pixel rate\n",
+			mode->name);
+		drm_mode_debug_printmodeline(mode);
+		return MODE_CLOCK_HIGH;
+	}
+
+	/* Check with link rate and lane count */
+	rate = zynqmp_dp_max_rate(max_rate, max_lanes, bpp);
+	if (mode->clock > rate) {
+		dev_dbg(dp->dev, "filtered the mode, %s,for high pixel rate\n",
+			mode->name);
+		drm_mode_debug_printmodeline(mode);
+		return MODE_CLOCK_HIGH;
+	}
+
+	return MODE_OK;
+}
+
+static const struct drm_connector_funcs zynqmp_dp_connector_funcs = {
+	.detect			= zynqmp_dp_connector_detect,
+	.fill_modes		= drm_helper_probe_single_connector_modes,
+	.destroy		= drm_connector_cleanup,
+	.atomic_duplicate_state	= drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state	= drm_atomic_helper_connector_destroy_state,
+	.reset			= drm_atomic_helper_connector_reset,
+};
+
+static const struct drm_connector_helper_funcs
+zynqmp_dp_connector_helper_funcs = {
+	.get_modes	= zynqmp_dp_connector_get_modes,
+	.best_encoder	= zynqmp_dp_connector_best_encoder,
+	.mode_valid	= zynqmp_dp_connector_mode_valid,
+};
+
+/* -----------------------------------------------------------------------------
+ * DRM Encoder
+ */
+
+static void zynqmp_dp_encoder_enable(struct drm_encoder *encoder)
+{
+	struct zynqmp_dp *dp = encoder_to_dp(encoder);
+	unsigned int i;
+	int ret = 0;
+
+	pm_runtime_get_sync(dp->dev);
+	dp->enabled = true;
+	zynqmp_dp_update_misc(dp);
+	if (zynqmp_disp_audio_enabled(dp->dpsub->disp))
+		zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CONTROL, 1);
+	zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN, 0);
+	if (dp->status == connector_status_connected) {
+		for (i = 0; i < 3; i++) {
+			ret = drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER,
+						 DP_SET_POWER_D0);
+			if (ret == 1)
+				break;
+			usleep_range(300, 500);
+		}
+		/* Some monitors take time to wake up properly */
+		msleep(zynqmp_dp_power_on_delay_ms);
+	}
+	if (ret != 1)
+		dev_dbg(dp->dev, "DP aux failed\n");
+	else
+		zynqmp_dp_train_loop(dp);
+	zynqmp_dp_write(dp, ZYNQMP_DP_SOFTWARE_RESET,
+			ZYNQMP_DP_SOFTWARE_RESET_ALL);
+	zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_ENABLE, 1);
+}
+
+static void zynqmp_dp_encoder_disable(struct drm_encoder *encoder)
+{
+	struct zynqmp_dp *dp = encoder_to_dp(encoder);
+
+	dp->enabled = false;
+	cancel_delayed_work(&dp->hpd_work);
+	zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_ENABLE, 0);
+	drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER, DP_SET_POWER_D3);
+	zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN,
+			ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL);
+	if (zynqmp_disp_audio_enabled(dp->dpsub->disp))
+		zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CONTROL, 0);
+	pm_runtime_put_sync(dp->dev);
+}
+
+static void
+zynqmp_dp_encoder_atomic_mode_set(struct drm_encoder *encoder,
+				  struct drm_crtc_state *crtc_state,
+				  struct drm_connector_state *connector_state)
+{
+	struct zynqmp_dp *dp = encoder_to_dp(encoder);
+	struct drm_display_mode *mode = &crtc_state->mode;
+	struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
+	u8 max_lanes = dp->link_config.max_lanes;
+	u8 bpp = dp->config.bpp;
+	int rate, max_rate = dp->link_config.max_rate;
+	int ret;
+
+	zynqmp_dp_set_format(dp, ZYNQMP_DPSUB_FORMAT_RGB, 8);
+
+	/* Check again as bpp or format might have been chagned */
+	rate = zynqmp_dp_max_rate(max_rate, max_lanes, bpp);
+	if (mode->clock > rate) {
+		dev_err(dp->dev, "the mode, %s,has too high pixel rate\n",
+			mode->name);
+		drm_mode_debug_printmodeline(mode);
+	}
+
+	ret = zynqmp_dp_mode_configure(dp, adjusted_mode->clock, 0);
+	if (ret < 0)
+		return;
+
+	zynqmp_dp_encoder_mode_set_transfer_unit(dp, adjusted_mode);
+	zynqmp_dp_encoder_mode_set_stream(dp, adjusted_mode);
+}
+
+#define ZYNQMP_DP_MIN_H_BACKPORCH	20
+
+static int
+zynqmp_dp_encoder_atomic_check(struct drm_encoder *encoder,
+			       struct drm_crtc_state *crtc_state,
+			       struct drm_connector_state *conn_state)
+{
+	struct drm_display_mode *mode = &crtc_state->mode;
+	struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
+	int diff = mode->htotal - mode->hsync_end;
+
+	/*
+	 * ZynqMP DP requires horizontal backporch to be greater than 12.
+	 * This limitation may not be compatible with the sink device.
+	 */
+	if (diff < ZYNQMP_DP_MIN_H_BACKPORCH) {
+		int vrefresh = (adjusted_mode->clock * 1000) /
+			       (adjusted_mode->vtotal * adjusted_mode->htotal);
+
+		dev_dbg(encoder->dev->dev, "hbackporch adjusted: %d to %d",
+			diff, ZYNQMP_DP_MIN_H_BACKPORCH - diff);
+		diff = ZYNQMP_DP_MIN_H_BACKPORCH - diff;
+		adjusted_mode->htotal += diff;
+		adjusted_mode->clock = adjusted_mode->vtotal *
+				       adjusted_mode->htotal * vrefresh / 1000;
+	}
+
+	return 0;
+}
+
+static const struct drm_encoder_helper_funcs zynqmp_dp_encoder_helper_funcs = {
+	.enable			= zynqmp_dp_encoder_enable,
+	.disable		= zynqmp_dp_encoder_disable,
+	.atomic_mode_set	= zynqmp_dp_encoder_atomic_mode_set,
+	.atomic_check		= zynqmp_dp_encoder_atomic_check,
+};
+
+/* -----------------------------------------------------------------------------
+ * Interrupt Handling
+ */
+
+/**
+ * zynqmp_dp_enable_vblank - Enable vblank
+ * @dp: DisplayPort IP core structure
+ *
+ * Enable vblank interrupt
+ */
+void zynqmp_dp_enable_vblank(struct zynqmp_dp *dp)
+{
+	zynqmp_dp_write(dp, ZYNQMP_DP_INT_EN, ZYNQMP_DP_INT_VBLANK_START);
+}
+
+/**
+ * zynqmp_dp_disable_vblank - Disable vblank
+ * @dp: DisplayPort IP core structure
+ *
+ * Disable vblank interrupt
+ */
+void zynqmp_dp_disable_vblank(struct zynqmp_dp *dp)
+{
+	zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, ZYNQMP_DP_INT_VBLANK_START);
+}
+
+static void zynqmp_dp_hpd_work_func(struct work_struct *work)
+{
+	struct zynqmp_dp *dp;
+
+	dp = container_of(work, struct zynqmp_dp, hpd_work.work);
+
+	if (dp->drm)
+		drm_helper_hpd_irq_event(dp->drm);
+}
+
+static irqreturn_t zynqmp_dp_irq_handler(int irq, void *data)
+{
+	struct zynqmp_dp *dp = (struct zynqmp_dp *)data;
+	u32 status, mask;
+
+	status = zynqmp_dp_read(dp, ZYNQMP_DP_INT_STATUS);
+	mask = zynqmp_dp_read(dp, ZYNQMP_DP_INT_MASK);
+	if (!(status & ~mask))
+		return IRQ_NONE;
+
+	/* dbg for diagnostic, but not much that the driver can do */
+	if (status & ZYNQMP_DP_INT_CHBUF_UNDERFLW_MASK)
+		dev_dbg_ratelimited(dp->dev, "underflow interrupt\n");
+	if (status & ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK)
+		dev_dbg_ratelimited(dp->dev, "overflow interrupt\n");
+
+	zynqmp_dp_write(dp, ZYNQMP_DP_INT_STATUS, status);
+
+	if (status & ZYNQMP_DP_INT_VBLANK_START)
+		zynqmp_disp_handle_vblank(dp->dpsub->disp);
+
+	if (status & ZYNQMP_DP_INT_HPD_EVENT)
+		schedule_delayed_work(&dp->hpd_work, 0);
+
+	if (status & ZYNQMP_DP_INT_HPD_IRQ) {
+		int ret;
+		u8 status[DP_LINK_STATUS_SIZE + 2];
+
+		ret = drm_dp_dpcd_read(&dp->aux, DP_SINK_COUNT, status,
+				       DP_LINK_STATUS_SIZE + 2);
+		if (ret < 0)
+			goto handled;
+
+		if (status[4] & DP_LINK_STATUS_UPDATED ||
+		    !drm_dp_clock_recovery_ok(&status[2], dp->mode.lane_cnt) ||
+		    !drm_dp_channel_eq_ok(&status[2], dp->mode.lane_cnt)) {
+			zynqmp_dp_train_loop(dp);
+		}
+	}
+
+handled:
+	return IRQ_HANDLED;
+}
+
+/* -----------------------------------------------------------------------------
+ * Initialization & Cleanup
+ */
+
+int zynqmp_dp_drm_init(struct zynqmp_dpsub *dpsub)
+{
+	struct zynqmp_dp *dp = dpsub->dp;
+	struct drm_encoder *encoder = &dp->encoder;
+	struct drm_connector *connector = &dp->connector;
+	int ret;
+
+	dp->config.misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK;
+	zynqmp_dp_set_format(dp, ZYNQMP_DPSUB_FORMAT_RGB, 8);
+
+	/* Create the DRM encoder and connector. */
+	encoder->possible_crtcs |= zynqmp_disp_get_crtc_mask(dpsub->disp);
+	drm_simple_encoder_init(dp->drm, encoder, DRM_MODE_ENCODER_TMDS);
+	drm_encoder_helper_add(encoder, &zynqmp_dp_encoder_helper_funcs);
+
+	connector->polled = DRM_CONNECTOR_POLL_HPD;
+	ret = drm_connector_init(encoder->dev, connector,
+				 &zynqmp_dp_connector_funcs,
+				 DRM_MODE_CONNECTOR_DisplayPort);
+	if (ret) {
+		dev_err(dp->dev, "failed to create the DRM connector\n");
+		return ret;
+	}
+
+	drm_connector_helper_add(connector, &zynqmp_dp_connector_helper_funcs);
+	drm_connector_register(connector);
+	drm_connector_attach_encoder(connector, encoder);
+
+	/* Initialize and register the AUX adapter. */
+	ret = zynqmp_dp_aux_init(dp);
+	if (ret) {
+		dev_err(dp->dev, "failed to initialize DP aux\n");
+		return ret;
+	}
+
+	/* Now that initialisation is complete, enable interrupts. */
+	zynqmp_dp_write(dp, ZYNQMP_DP_INT_EN, ZYNQMP_DP_INT_ALL);
+
+	return 0;
+}
+
+int zynqmp_dp_probe(struct zynqmp_dpsub *dpsub, struct drm_device *drm)
+{
+	struct platform_device *pdev = to_platform_device(dpsub->dev);
+	struct zynqmp_dp *dp;
+	struct resource *res;
+	int ret;
+
+	dp = drmm_kzalloc(drm, sizeof(*dp), GFP_KERNEL);
+	if (!dp)
+		return -ENOMEM;
+
+	dp->dev = &pdev->dev;
+	dp->dpsub = dpsub;
+	dp->status = connector_status_disconnected;
+	dp->drm = drm;
+
+	INIT_DELAYED_WORK(&dp->hpd_work, zynqmp_dp_hpd_work_func);
+
+	dpsub->dp = dp;
+
+	/* Acquire all resources (IOMEM, IRQ and PHYs). */
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dp");
+	dp->iomem = devm_ioremap_resource(dp->dev, res);
+	if (IS_ERR(dp->iomem))
+		return PTR_ERR(dp->iomem);
+
+	dp->irq = platform_get_irq(pdev, 0);
+	if (dp->irq < 0)
+		return dp->irq;
+
+	dp->reset = devm_reset_control_get(dp->dev, NULL);
+	if (IS_ERR(dp->reset)) {
+		if (PTR_ERR(dp->reset) != -EPROBE_DEFER)
+			dev_err(dp->dev, "failed to get reset: %ld\n",
+				PTR_ERR(dp->reset));
+		return PTR_ERR(dp->reset);
+	}
+
+	ret = zynqmp_dp_phy_probe(dp);
+	if (ret)
+		return ret;
+
+	/* Initialize the hardware. */
+	zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN,
+			ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL);
+	zynqmp_dp_set(dp, ZYNQMP_DP_PHY_RESET, ZYNQMP_DP_PHY_RESET_ALL_RESET);
+	zynqmp_dp_write(dp, ZYNQMP_DP_FORCE_SCRAMBLER_RESET, 1);
+	zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 0);
+	zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, 0xffffffff);
+
+	ret = zynqmp_dp_phy_init(dp);
+	if (ret)
+		return ret;
+
+	zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 1);
+
+	/*
+	 * Now that the hardware is initialized and won't generate spurious
+	 * interrupts, request the IRQ.
+	 */
+	ret = devm_request_threaded_irq(dp->dev, dp->irq, NULL,
+					zynqmp_dp_irq_handler, IRQF_ONESHOT,
+					dev_name(dp->dev), dp);
+	if (ret < 0)
+		goto error;
+
+	dev_dbg(dp->dev, "ZynqMP DisplayPort Tx probed with %u lanes\n",
+		dp->num_lanes);
+
+	return 0;
+
+error:
+	zynqmp_dp_phy_exit(dp);
+	return ret;
+}
+
+void zynqmp_dp_remove(struct zynqmp_dpsub *dpsub)
+{
+	struct zynqmp_dp *dp = dpsub->dp;
+
+	zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, ZYNQMP_DP_INT_ALL);
+	disable_irq(dp->irq);
+
+	cancel_delayed_work_sync(&dp->hpd_work);
+	zynqmp_dp_aux_cleanup(dp);
+
+	zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 0);
+	zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, 0xffffffff);
+
+	zynqmp_dp_phy_exit(dp);
+}

drivers/gpu/drm/xlnx/zynqmp_dp.h

···
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * ZynqMP DisplayPort Driver
+ *
+ * Copyright (C) 2017 - 2020 Xilinx, Inc.
+ *
+ * Authors:
+ * - Hyun Woo Kwon <[e-mail]>
+ * - Laurent Pinchart <[e-mail]>
+ */
+
+#ifndef _ZYNQMP_DP_H_
+#define _ZYNQMP_DP_H_
+
+struct drm_device;
+struct platform_device;
+struct zynqmp_dp;
+struct zynqmp_dpsub;
+
+void zynqmp_dp_enable_vblank(struct zynqmp_dp *dp);
+void zynqmp_dp_disable_vblank(struct zynqmp_dp *dp);
+
+int zynqmp_dp_drm_init(struct zynqmp_dpsub *dpsub);
+int zynqmp_dp_probe(struct zynqmp_dpsub *dpsub, struct drm_device *drm);
+void zynqmp_dp_remove(struct zynqmp_dpsub *dpsub);
+
+#endif /* _ZYNQMP_DP_H_ */

drivers/gpu/drm/xlnx/zynqmp_dpsub.c

···
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ZynqMP DisplayPort Subsystem Driver
+ *
+ * Copyright (C) 2017 - 2020 Xilinx, Inc.
+ *
+ * Authors:
+ * - Hyun Woo Kwon <[e-mail]>
+ * - Laurent Pinchart <[e-mail]>
+ */
+
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/module.h>
+#include <linux/of_reserved_mem.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_device.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_managed.h>
+#include <drm/drm_mode_config.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_vblank.h>
+
+#include "zynqmp_disp.h"
+#include "zynqmp_dp.h"
+#include "zynqmp_dpsub.h"
+
+/* -----------------------------------------------------------------------------
+ * Dumb Buffer & Framebuffer Allocation
+ */
+
+static int zynqmp_dpsub_dumb_create(struct drm_file *file_priv,
+				    struct drm_device *drm,
+				    struct drm_mode_create_dumb *args)
+{
+	struct zynqmp_dpsub *dpsub = to_zynqmp_dpsub(drm);
+	unsigned int pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
+
+	/* Enforce the alignment constraints of the DMA engine. */
+	args->pitch = ALIGN(pitch, dpsub->dma_align);
+
+	return drm_gem_cma_dumb_create_internal(file_priv, drm, args);
+}
+
+static struct drm_framebuffer *
+zynqmp_dpsub_fb_create(struct drm_device *drm, struct drm_file *file_priv,
+		       const struct drm_mode_fb_cmd2 *mode_cmd)
+{
+	struct zynqmp_dpsub *dpsub = to_zynqmp_dpsub(drm);
+	struct drm_mode_fb_cmd2 cmd = *mode_cmd;
+	unsigned int i;
+
+	/* Enforce the alignment constraints of the DMA engine. */
+	for (i = 0; i < ARRAY_SIZE(cmd.pitches); ++i)
+		cmd.pitches[i] = ALIGN(cmd.pitches[i], dpsub->dma_align);
+
+	return drm_gem_fb_create(drm, file_priv, &cmd);
+}
+
+static const struct drm_mode_config_funcs zynqmp_dpsub_mode_config_funcs = {
+	.fb_create		= zynqmp_dpsub_fb_create,
+	.atomic_check		= drm_atomic_helper_check,
+	.atomic_commit		= drm_atomic_helper_commit,
+};
+
+/* -----------------------------------------------------------------------------
+ * DRM/KMS Driver
+ */
+
+DEFINE_DRM_GEM_CMA_FOPS(zynqmp_dpsub_drm_fops);
+
+static struct drm_driver zynqmp_dpsub_drm_driver = {
+	.driver_features		= DRIVER_MODESET | DRIVER_GEM |
+					  DRIVER_ATOMIC,
+
+	.prime_handle_to_fd		= drm_gem_prime_handle_to_fd,
+	.prime_fd_to_handle		= drm_gem_prime_fd_to_handle,
+	.gem_prime_export		= drm_gem_prime_export,
+	.gem_prime_import		= drm_gem_prime_import,
+	.gem_prime_get_sg_table		= drm_gem_cma_prime_get_sg_table,
+	.gem_prime_import_sg_table	= drm_gem_cma_prime_import_sg_table,
+	.gem_prime_vmap			= drm_gem_cma_prime_vmap,
+	.gem_prime_vunmap		= drm_gem_cma_prime_vunmap,
+	.gem_prime_mmap			= drm_gem_cma_prime_mmap,
+	.gem_free_object_unlocked	= drm_gem_cma_free_object,
+	.gem_vm_ops			= &drm_gem_cma_vm_ops,
+	.dumb_create			= zynqmp_dpsub_dumb_create,
+	.dumb_destroy			= drm_gem_dumb_destroy,
+
+	.fops				= &zynqmp_dpsub_drm_fops,
+
+	.name				= "zynqmp-dpsub",
+	.desc				= "Xilinx DisplayPort Subsystem Driver",
+	.date				= "20130509",
+	.major				= 1,
+	.minor				= 0,
+};
+
+static int zynqmp_dpsub_drm_init(struct zynqmp_dpsub *dpsub)
+{
+	struct drm_device *drm = &dpsub->drm;
+	int ret;
+
+	/* Initialize mode config, vblank and the KMS poll helper. */
+	ret = drmm_mode_config_init(drm);
+	if (ret < 0)
+		goto err_dev_put;
+
+	drm->mode_config.funcs = &zynqmp_dpsub_mode_config_funcs;
+	drm->mode_config.min_width = 0;
+	drm->mode_config.min_height = 0;
+	drm->mode_config.max_width = ZYNQMP_DISP_MAX_WIDTH;
+	drm->mode_config.max_height = ZYNQMP_DISP_MAX_HEIGHT;
+
+	ret = drm_vblank_init(drm, 1);
+	if (ret)
+		goto err_dev_put;
+
+	drm->irq_enabled = 1;
+
+	drm_kms_helper_poll_init(drm);
+
+	/*
+	 * Initialize the DISP and DP components. This will creates planes,
+	 * CRTC, encoder and connector. The DISP should be initialized first as
+	 * the DP encoder needs the CRTC.
+	 */
+	ret = zynqmp_disp_drm_init(dpsub);
+	if (ret)
+		goto err_poll_fini;
+
+	ret = zynqmp_dp_drm_init(dpsub);
+	if (ret)
+		goto err_poll_fini;
+
+	/* Reset all components and register the DRM device. */
+	drm_mode_config_reset(drm);
+
+	ret = drm_dev_register(drm, 0);
+	if (ret < 0)
+		goto err_poll_fini;
+
+	/* Initialize fbdev generic emulation. */
+	drm_fbdev_generic_setup(drm, 24);
+
+	return 0;
+
+err_poll_fini:
+	drm_kms_helper_poll_fini(drm);
+err_dev_put:
+	drm_dev_put(drm);
+	return ret;
+}
+
+/* -----------------------------------------------------------------------------
+ * Power Management
+ */
+
+static int __maybe_unused zynqmp_dpsub_suspend(struct device *dev)
+{
+	struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev);
+
+	return drm_mode_config_helper_suspend(&dpsub->drm);
+}
+
+static int __maybe_unused zynqmp_dpsub_resume(struct device *dev)
+{
+	struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev);
+
+	return drm_mode_config_helper_resume(&dpsub->drm);
+}
+
+static const struct dev_pm_ops zynqmp_dpsub_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(zynqmp_dpsub_suspend, zynqmp_dpsub_resume)
+};
+
+/* -----------------------------------------------------------------------------
+ * Probe & Remove
+ */
+
+static int zynqmp_dpsub_init_clocks(struct zynqmp_dpsub *dpsub)
+{
+	int ret;
+
+	dpsub->apb_clk = devm_clk_get(dpsub->dev, "dp_apb_clk");
+	if (IS_ERR(dpsub->apb_clk))
+		return PTR_ERR(dpsub->apb_clk);
+
+	ret = clk_prepare_enable(dpsub->apb_clk);
+	if (ret) {
+		dev_err(dpsub->dev, "failed to enable the APB clock\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int zynqmp_dpsub_probe(struct platform_device *pdev)
+{
+	struct zynqmp_dpsub *dpsub;
+	int ret;
+
+	/* Allocate private data. */
+	dpsub = kzalloc(sizeof(*dpsub), GFP_KERNEL);
+	if (!dpsub)
+		return -ENOMEM;
+
+	dpsub->dev = &pdev->dev;
+	platform_set_drvdata(pdev, dpsub);
+
+	dma_set_mask(dpsub->dev, DMA_BIT_MASK(ZYNQMP_DISP_MAX_DMA_BIT));
+
+	/*
+	 * Initialize the DRM device early, as the DRM core mandates usage of
+	 * the managed memory helpers tied to the DRM device.
+	 */
+	ret = drm_dev_init(&dpsub->drm, &zynqmp_dpsub_drm_driver, &pdev->dev);
+	if (ret < 0) {
+		kfree(dpsub);
+		return ret;
+	}
+
+	drmm_add_final_kfree(&dpsub->drm, dpsub);
+
+	/* Try the reserved memory. Proceed if there's none. */
+	of_reserved_mem_device_init(&pdev->dev);
+
+	ret = zynqmp_dpsub_init_clocks(dpsub);
+	if (ret < 0)
+		goto err_mem;
+
+	pm_runtime_enable(&pdev->dev);
+
+	/*
+	 * DP should be probed first so that the zynqmp_disp can set the output
+	 * format accordingly.
+	 */
+	ret = zynqmp_dp_probe(dpsub, &dpsub->drm);
+	if (ret)
+		goto err_pm;
+
+	ret = zynqmp_disp_probe(dpsub, &dpsub->drm);
+	if (ret)
+		goto err_dp;
+
+	ret = zynqmp_dpsub_drm_init(dpsub);
+	if (ret)
+		goto err_disp;
+
+	dev_info(&pdev->dev, "ZynqMP DisplayPort Subsystem driver probed");
+
+	return 0;
+
+err_disp:
+	zynqmp_disp_remove(dpsub);
+err_dp:
+	zynqmp_dp_remove(dpsub);
+err_pm:
+	pm_runtime_disable(&pdev->dev);
+	clk_disable_unprepare(dpsub->apb_clk);
+err_mem:
+	of_reserved_mem_device_release(&pdev->dev);
+	return ret;
+}
+
+static int zynqmp_dpsub_remove(struct platform_device *pdev)
+{
+	struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev);
+	struct drm_device *drm = &dpsub->drm;
+
+	drm_dev_unregister(drm);
+	drm_atomic_helper_shutdown(drm);
+	drm_kms_helper_poll_fini(drm);
+
+	zynqmp_disp_remove(dpsub);
+	zynqmp_dp_remove(dpsub);
+
+	pm_runtime_disable(&pdev->dev);
+	clk_disable_unprepare(dpsub->apb_clk);
+	of_reserved_mem_device_release(&pdev->dev);
+
+	drm_dev_put(drm);
+
+	return 0;
+}
+
+static void zynqmp_dpsub_shutdown(struct platform_device *pdev)
+{
+	struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev);
+
+	drm_atomic_helper_shutdown(&dpsub->drm);
+}
+
+static const struct of_device_id zynqmp_dpsub_of_match[] = {
+	{ .compatible = "xlnx,zynqmp-dpsub-1.7", },
+	{ /* end of table */ },
+};
+MODULE_DEVICE_TABLE(of, zynqmp_dpsub_of_match);
+
+static struct platform_driver zynqmp_dpsub_driver = {
+	.probe			= zynqmp_dpsub_probe,
+	.remove			= zynqmp_dpsub_remove,
+	.shutdown		= zynqmp_dpsub_shutdown,
+	.driver			= {
+		.name		= "zynqmp-dpsub",
+		.pm		= &zynqmp_dpsub_pm_ops,
+		.of_match_table	= zynqmp_dpsub_of_match,
+	},
+};
+
+module_platform_driver(zynqmp_dpsub_driver);
+
+MODULE_AUTHOR("Xilinx, Inc.");
+MODULE_DESCRIPTION("ZynqMP DP Subsystem Driver");
+MODULE_LICENSE("GPL v2");

drivers/gpu/drm/xlnx/zynqmp_dpsub.h

···
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * ZynqMP DPSUB Subsystem Driver
+ *
+ * Copyright (C) 2017 - 2020 Xilinx, Inc.
+ *
+ * Authors:
+ * - Hyun Woo Kwon <[e-mail]>
+ * - Laurent Pinchart <[e-mail]>
+ */
+
+#ifndef _ZYNQMP_DPSUB_H_
+#define _ZYNQMP_DPSUB_H_
+
+struct clk;
+struct device;
+struct drm_device;
+struct zynqmp_disp;
+struct zynqmp_dp;
+
+enum zynqmp_dpsub_format {
+	ZYNQMP_DPSUB_FORMAT_RGB,
+	ZYNQMP_DPSUB_FORMAT_YCRCB444,
+	ZYNQMP_DPSUB_FORMAT_YCRCB422,
+	ZYNQMP_DPSUB_FORMAT_YONLY,
+};
+
+/**
+ * struct zynqmp_dpsub - ZynqMP DisplayPort Subsystem
+ * @drm: The DRM/KMS device
+ * @dev: The physical device
+ * @apb_clk: The APB clock
+ * @disp: The display controller
+ * @dp: The DisplayPort controller
+ * @dma_align: DMA alignment constraint (must be a power of 2)
+ */
+struct zynqmp_dpsub {
+	struct drm_device drm;
+	struct device *dev;
+
+	struct clk *apb_clk;
+
+	struct zynqmp_disp *disp;
+	struct zynqmp_dp *dp;
+
+	unsigned int dma_align;
+};
+
+static inline struct zynqmp_dpsub *to_zynqmp_dpsub(struct drm_device *drm)
+{
+	return container_of(drm, struct zynqmp_dpsub, drm);
+}
+
+#endif /* _ZYNQMP_DPSUB_H_ */