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From: Markus Schneider-Pargmann <msp@baylibre.com>
To: Chun-Kuang Hu <chunkuang.hu@kernel.org>,
 Philipp Zabel <p.zabel@pengutronix.de>
Cc: Sam Ravnborg <sam@ravnborg.org>, dri-devel@lists.freedesktop.org,
 linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org,
 Markus Schneider-Pargmann <msp@baylibre.com>
Subject: [PATCH v2 6/6] drm/mediatek: Add mt8195 DisplayPort driver
Date: Mon, 20 Sep 2021 10:44:24 +0200
Message-Id: <20210920084424.231825-7-msp@baylibre.com>
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 linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org

This patch adds a DisplayPort driver for the Mediatek mt8195 SoC and a
according phy driver mediatek-dp-phy.

It supports both functional units on the mt8195, the embedded
DisplayPort as well as the external DisplayPort units. It offers
hot-plug-detection, audio up to 8 channels, and DisplayPort 1.4 with up
to 4 lanes.

The driver creates a child device for the phy. The child device will
never exist without the parent being active. As they are sharing a
register range, the parent passes a regmap pointer to the child so that
both can work with the same register range. The phy driver sets device
data that is read by the parent to get the phy device that can be used
to control the phy properties.

This driver is based on an initial version by
Jason-JH.Lin <jason-jh.lin@mediatek.com>.

Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
---

Notes:
    Changes v1 -> v2:
    - Fix checkpatch --strict suggestions
    - General cleanups of the code.
    - Remove all remaining non-atomic functions.
    - Remove unused includes and sort them.
    - Remove unused select GENERIC_PHY
    - Rename phy registers DP_PHY -> MTK_DP_PHY
    - Replace usage of delays with usleep_range.
    - Split the phy register accesses into a separate phy driver.
    - Use a lock to guard access to mtk_dp->edid as it can be allocated/used/freed
      in different threads
    - use struct dp_sdp for sdp packets.
    
    Changes RFC -> v1:
    - Removed unused register definitions.
    - Replaced workqueue with threaded irq.
    - Removed connector code.
    - Move to atomic_* drm functions.
    - General cleanups of the code.
    - Remove unused select GENERIC_PHY.

 drivers/gpu/drm/mediatek/Kconfig       |    7 +
 drivers/gpu/drm/mediatek/Makefile      |    2 +
 drivers/gpu/drm/mediatek/mtk_dp.c      | 2855 ++++++++++++++++++++++++
 drivers/gpu/drm/mediatek/mtk_dp_reg.h  |  498 +++++
 drivers/gpu/drm/mediatek/mtk_drm_drv.c |    1 +
 drivers/gpu/drm/mediatek/mtk_drm_drv.h |    1 +
 drivers/phy/mediatek/Kconfig           |    8 +
 drivers/phy/mediatek/Makefile          |    1 +
 drivers/phy/mediatek/phy-mtk-dp.c      |  218 ++
 include/linux/soc/mediatek/mtk-mmsys.h |    2 +
 10 files changed, 3593 insertions(+)
 create mode 100644 drivers/gpu/drm/mediatek/mtk_dp.c
 create mode 100644 drivers/gpu/drm/mediatek/mtk_dp_reg.h
 create mode 100644 drivers/phy/mediatek/phy-mtk-dp.c

diff --git a/drivers/gpu/drm/mediatek/Kconfig b/drivers/gpu/drm/mediatek/Kconfig
index 2976d21e9a34..029b94c71613 100644
--- a/drivers/gpu/drm/mediatek/Kconfig
+++ b/drivers/gpu/drm/mediatek/Kconfig
@@ -28,3 +28,10 @@ config DRM_MEDIATEK_HDMI
 	select PHY_MTK_HDMI
 	help
 	  DRM/KMS HDMI driver for Mediatek SoCs
+
+config MTK_DPTX_SUPPORT
+	tristate "DRM DPTX Support for Mediatek SoCs"
+	depends on DRM_MEDIATEK
+	select PHY_MTK_DP
+	help
+	  DRM/KMS Display Port driver for Mediatek SoCs.
diff --git a/drivers/gpu/drm/mediatek/Makefile b/drivers/gpu/drm/mediatek/Makefile
index 29098d7c8307..d86a6406055e 100644
--- a/drivers/gpu/drm/mediatek/Makefile
+++ b/drivers/gpu/drm/mediatek/Makefile
@@ -21,3 +21,5 @@ mediatek-drm-hdmi-objs := mtk_cec.o \
 			  mtk_hdmi_ddc.o
 
 obj-$(CONFIG_DRM_MEDIATEK_HDMI) += mediatek-drm-hdmi.o
+
+obj-$(CONFIG_MTK_DPTX_SUPPORT) += mtk_dp.o
diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/mtk_dp.c
new file mode 100644
index 000000000000..5d95ff68b0df
--- /dev/null
+++ b/drivers/gpu/drm/mediatek/mtk_dp.c
@@ -0,0 +1,2855 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2019 MediaTek Inc.
+ * Copyright (c) 2021 BayLibre
+ */
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_dp_helper.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_of.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_print.h>
+#include <drm/drm_probe_helper.h>
+#include <linux/arm-smccc.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <sound/hdmi-codec.h>
+#include <video/videomode.h>
+
+#include "mtk_dp_reg.h"
+
+#define MTK_DP_AUX_WAIT_REPLY_COUNT		20000
+#define MTK_DP_CHECK_SINK_CAP_TIMEOUT_COUNT	3
+
+#define MTK_DP_MAX_LANES			4
+#define MTK_DP_MAX_LINK_RATE			MTK_DP_LINKRATE_HBR3
+
+#define MTK_DP_TBC_BUF_READ_START_ADDR		0x08
+
+#define MTK_DP_TRAIN_RETRY_LIMIT		8
+#define MTK_DP_TRAIN_MAX_ITERATIONS		5
+
+#define MTK_DP_AUX_WRITE_READ_WAIT_TIME_US	20
+
+#define MTK_DP_DP_VERSION_11			0x11
+
+enum mtk_dp_state {
+	MTK_DP_STATE_INITIAL,
+	MTK_DP_STATE_IDLE,
+	MTK_DP_STATE_PREPARE,
+	MTK_DP_STATE_NORMAL,
+};
+
+enum mtk_dp_train_state {
+	MTK_DP_TRAIN_STATE_STARTUP = 0,
+	MTK_DP_TRAIN_STATE_CHECKCAP,
+	MTK_DP_TRAIN_STATE_CHECKEDID,
+	MTK_DP_TRAIN_STATE_TRAINING_PRE,
+	MTK_DP_TRAIN_STATE_TRAINING,
+	MTK_DP_TRAIN_STATE_CHECKTIMING,
+	MTK_DP_TRAIN_STATE_NORMAL,
+	MTK_DP_TRAIN_STATE_POWERSAVE,
+	MTK_DP_TRAIN_STATE_DPIDLE,
+};
+
+struct mtk_dp_timings {
+	struct videomode vm;
+
+	u16 htotal;
+	u16 vtotal;
+	u8 frame_rate;
+	u32 pix_rate_khz;
+};
+
+struct mtk_dp_train_info {
+	bool tps3;
+	bool tps4;
+	bool sink_ssc;
+	bool cable_plugged_in;
+	bool cable_state_change;
+	bool cr_done;
+	bool eq_done;
+
+	// link_rate is in multiple of 0.27Gbps
+	int link_rate;
+	int lane_count;
+
+	int irq_status;
+	int check_cap_count;
+};
+
+// Same values as used by the DP Spec for MISC0 bits 1 and 2
+enum mtk_dp_color_format {
+	MTK_DP_COLOR_FORMAT_RGB_444     = 0,
+	MTK_DP_COLOR_FORMAT_YUV_422     = 1,
+	MTK_DP_COLOR_FORMAT_YUV_444     = 2,
+	MTK_DP_COLOR_FORMAT_YUV_420     = 3,
+	MTK_DP_COLOR_FORMAT_YONLY       = 4,
+	MTK_DP_COLOR_FORMAT_RAW         = 5,
+	MTK_DP_COLOR_FORMAT_RESERVED    = 6,
+	MTK_DP_COLOR_FORMAT_DEFAULT     = MTK_DP_COLOR_FORMAT_RGB_444,
+	MTK_DP_COLOR_FORMAT_UNKNOWN     = 15,
+};
+
+// Multiple of 0.27Gbps
+enum mtk_dp_linkrate {
+	MTK_DP_LINKRATE_RBR	=  0x6,
+	MTK_DP_LINKRATE_HBR	=  0xA,
+	MTK_DP_LINKRATE_HBR2	= 0x14,
+	MTK_DP_LINKRATE_HBR25	= 0x19,
+	MTK_DP_LINKRATE_HBR3	= 0x1E,
+};
+
+// Same values as used for DP Spec MISC0 bits 5,6,7
+enum mtk_dp_color_depth {
+	MTK_DP_COLOR_DEPTH_6BIT       = 0,
+	MTK_DP_COLOR_DEPTH_8BIT       = 1,
+	MTK_DP_COLOR_DEPTH_10BIT      = 2,
+	MTK_DP_COLOR_DEPTH_12BIT      = 3,
+	MTK_DP_COLOR_DEPTH_16BIT      = 4,
+	MTK_DP_COLOR_DEPTH_UNKNOWN    = 5,
+};
+
+struct mtk_dp_audio_cfg {
+	int sample_rate;
+	int word_length_bits;
+	int channels;
+};
+
+struct mtk_dp_info {
+	enum mtk_dp_color_depth depth;
+	enum mtk_dp_color_format format;
+	struct mtk_dp_audio_cfg audio_caps;
+	struct mtk_dp_timings timings;
+};
+
+struct mtk_dp_driver_data {
+	bool is_edp;
+};
+
+struct mtk_dp {
+	const struct mtk_dp_driver_data *driver_data;
+	struct device *dev;
+	struct platform_device *phy_dev;
+	struct phy *phy;
+
+	struct drm_device *drm_dev;
+	struct drm_bridge bridge;
+	struct drm_bridge *next_bridge;
+	struct drm_dp_aux aux;
+
+	struct mutex edid_lock;
+	struct edid *edid;
+
+	u8 rx_cap[DP_RECEIVER_CAP_SIZE];
+
+	struct mtk_dp_info info;
+	enum mtk_dp_state state;
+
+	struct mtk_dp_train_info train_info;
+	enum mtk_dp_train_state train_state;
+
+	struct regmap *regs;
+	struct clk *dp_tx_clk;
+
+	// TODO: These look kind of similar partly. Also doesn't the state give
+	// that info?
+	bool enabled;
+	bool audio_enable;
+
+	bool has_fec;
+	struct mutex dp_lock;
+
+	struct mutex update_plugged_status_lock;
+
+	hdmi_codec_plugged_cb plugged_cb;
+	struct device *codec_dev;
+	u8 connector_eld[MAX_ELD_BYTES];
+};
+
+enum mtk_dp_sdp_type {
+	MTK_DP_SDP_NONE = 0x00,
+	MTK_DP_SDP_ACM  = 0x01,
+	MTK_DP_SDP_ISRC = 0x02,
+	MTK_DP_SDP_AVI  = 0x03,
+	MTK_DP_SDP_AUI  = 0x04,
+	MTK_DP_SDP_SPD  = 0x05,
+	MTK_DP_SDP_MPEG = 0x06,
+	MTK_DP_SDP_NTSC = 0x07,
+	MTK_DP_SDP_VSP  = 0x08,
+	MTK_DP_SDP_VSC  = 0x09,
+	MTK_DP_SDP_EXT  = 0x0A,
+	MTK_DP_SDP_PPS0 = 0x0B,
+	MTK_DP_SDP_PPS1 = 0x0C,
+	MTK_DP_SDP_PPS2 = 0x0D,
+	MTK_DP_SDP_PPS3 = 0x0E,
+	MTK_DP_SDP_DRM  = 0x10,
+	MTK_DP_SDP_MAX_NUM
+};
+
+struct mtk_dp_sdp_packet {
+	enum mtk_dp_sdp_type type;
+	struct dp_sdp sdp;
+};
+
+#define MTK_DP_IEC_CHANNEL_STATUS_LEN 5
+union mtk_dp_audio_channel_status {
+	struct {
+		u8 rev : 1;
+		u8 is_lpcm : 1;
+		u8 copy_right : 1;
+		u8 additional_format_info : 3;
+		u8 channel_status_mode : 2;
+		u8 category_code;
+		u8 src_num : 4;
+		u8 channel_num : 4;
+		u8 sampling_freq : 4;
+		u8 clk_accuracy : 2;
+		u8 rev2 : 2;
+		u8 word_len : 4;
+		u8 original_sampling_freq : 4;
+	} iec;
+
+	u8 buf[MTK_DP_IEC_CHANNEL_STATUS_LEN];
+};
+
+static struct regmap_config mtk_dp_regmap_config = {
+	.reg_bits	= 32,
+	.val_bits	= 32,
+	.reg_stride	= 4,
+	.max_register	= SEC_OFFSET + 0x90,
+	.name		= "mtk-dp-registers",
+};
+
+static inline struct mtk_dp *mtk_dp_from_bridge(struct drm_bridge *b)
+{
+	return container_of(b, struct mtk_dp, bridge);
+}
+
+static u32 mtk_dp_read(struct mtk_dp *mtk_dp, u32 offset)
+{
+	u32 read_val;
+	int ret;
+
+	ret = regmap_read(mtk_dp->regs, offset, &read_val);
+	if (ret) {
+		dev_err(mtk_dp->dev, "Failed to read register 0x%x: %d\n",
+			offset, ret);
+		return 0;
+	}
+
+	return read_val;
+}
+
+static void mtk_dp_write(struct mtk_dp *mtk_dp, u32 offset, u32 val)
+{
+	int ret;
+
+	ret = regmap_write(mtk_dp->regs, offset, val);
+	if (ret)
+		dev_err(mtk_dp->dev,
+			"Failed to write register 0x%x with value 0x%x: %d\n",
+			offset, val, ret);
+}
+
+static void mtk_dp_update_bits(struct mtk_dp *mtk_dp, u32 offset, u32 val,
+			       u32 mask)
+{
+	int ret;
+
+	ret = regmap_update_bits(mtk_dp->regs, offset, mask, val);
+	if (ret)
+		dev_err(mtk_dp->dev,
+			"Failed to update register 0x%x with value 0x%x, mask 0x%x: %d\n",
+			offset, val, mask, ret);
+}
+
+static void mtk_dp_bulk_16bit_write(struct mtk_dp *mtk_dp, u32 offset, u8 *buf,
+				    size_t length)
+{
+	int i;
+	int num_regs = (length + 1) / 2;
+
+	// 2 bytes per register
+	for (i = 0; i < num_regs; i++) {
+		u32 val = buf[i * 2] |
+			  (i * 2 + 1 < length ? buf[i * 2 + 1] << 8 : 0);
+
+		mtk_dp_write(mtk_dp, offset + i * 4, val);
+	}
+}
+
+static unsigned long mtk_dp_sip_atf_call(unsigned int cmd, unsigned int para)
+{
+	struct arm_smccc_res res;
+
+	arm_smccc_smc(MTK_DP_SIP_CONTROL_AARCH32, cmd, para, 0, 0, 0, 0, 0,
+		      &res);
+
+	pr_debug("[DPTX]%s cmd 0x%x, p1 0x%x, ret 0x%lx-0x%lx", __func__, cmd,
+		 para, res.a0, res.a1);
+	return res.a1;
+}
+
+static void mtk_dp_msa_bypass_disable(struct mtk_dp *mtk_dp)
+{
+	const u16 bits_to_set = BIT(HTOTAL_SEL_DP_ENC0_P0_SHIFT) |
+				BIT(VTOTAL_SEL_DP_ENC0_P0_SHIFT) |
+				BIT(HSTART_SEL_DP_ENC0_P0_SHIFT) |
+				BIT(VSTART_SEL_DP_ENC0_P0_SHIFT) |
+				BIT(HWIDTH_SEL_DP_ENC0_P0_SHIFT) |
+				BIT(VHEIGHT_SEL_DP_ENC0_P0_SHIFT) |
+				BIT(HSP_SEL_DP_ENC0_P0_SHIFT) |
+				BIT(HSW_SEL_DP_ENC0_P0_SHIFT) |
+				BIT(VSP_SEL_DP_ENC0_P0_SHIFT) |
+				BIT(VSW_SEL_DP_ENC0_P0_SHIFT);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3030, bits_to_set,
+			   bits_to_set);
+}
+
+static void mtk_dp_set_msa(struct mtk_dp *mtk_dp)
+{
+	struct mtk_dp_timings *timings = &mtk_dp->info.timings;
+
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3010, timings->htotal,
+			   HTOTAL_SW_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3018,
+			   timings->vm.hsync_len + timings->vm.hback_porch,
+			   HSTART_SW_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3028,
+			   timings->vm.hsync_len << HSW_SW_DP_ENC0_P0_SHIFT,
+			   HSW_SW_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3028, 0,
+			   HSP_SW_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3020, timings->vm.hactive,
+			   HWIDTH_SW_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3014, timings->vtotal,
+			   VTOTAL_SW_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_301C,
+			   timings->vm.vsync_len + timings->vm.vback_porch,
+			   VSTART_SW_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_302C,
+			   timings->vm.vsync_len << VSW_SW_DP_ENC0_P0_SHIFT,
+			   VSW_SW_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_302C, 0,
+			   VSP_SW_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3024, timings->vm.vactive,
+			   VHEIGHT_SW_DP_ENC0_P0_MASK);
+
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3064, timings->vm.hactive,
+			   HDE_NUM_LAST_DP_ENC0_P0_MASK);
+
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3154, timings->htotal,
+			   PGEN_HTOTAL_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3158,
+			   timings->vm.hfront_porch,
+			   PGEN_HSYNC_RISING_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_315C, timings->vm.hsync_len,
+			   PGEN_HSYNC_PULSE_WIDTH_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3160,
+			   timings->vm.hback_porch + timings->vm.hsync_len,
+			   PGEN_HFDE_START_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3164, timings->vm.hactive,
+			   PGEN_HFDE_ACTIVE_WIDTH_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3168, timings->vtotal,
+			   PGEN_VTOTAL_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_316C,
+			   timings->vm.vfront_porch,
+			   PGEN_VSYNC_RISING_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3170, timings->vm.vsync_len,
+			   PGEN_VSYNC_PULSE_WIDTH_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3174,
+			   timings->vm.vback_porch + timings->vm.vsync_len,
+			   PGEN_VFDE_START_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3178, timings->vm.vactive,
+			   PGEN_VFDE_ACTIVE_WIDTH_DP_ENC0_P0_MASK);
+}
+
+static void mtk_dp_set_color_format(struct mtk_dp *mtk_dp,
+				    enum mtk_dp_color_format color_format)
+{
+	u32 val;
+
+	mtk_dp->info.format = color_format;
+
+	// Update MISC0
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3034,
+			   color_format << DP_TEST_COLOR_FORMAT_SHIFT,
+			   DP_TEST_COLOR_FORMAT_MASK);
+
+	switch (color_format) {
+	case MTK_DP_COLOR_FORMAT_YUV_422:
+		val = PIXEL_ENCODE_FORMAT_DP_ENC0_P0_YCBCR422;
+		break;
+	case MTK_DP_COLOR_FORMAT_YUV_420:
+		val = PIXEL_ENCODE_FORMAT_DP_ENC0_P0_YCBCR420;
+		break;
+	case MTK_DP_COLOR_FORMAT_YONLY:
+	case MTK_DP_COLOR_FORMAT_RAW:
+	case MTK_DP_COLOR_FORMAT_RESERVED:
+	case MTK_DP_COLOR_FORMAT_UNKNOWN:
+		drm_warn(mtk_dp->drm_dev, "Unsupported color format: %d\n",
+			 color_format);
+		fallthrough;
+	case MTK_DP_COLOR_FORMAT_RGB_444:
+	case MTK_DP_COLOR_FORMAT_YUV_444:
+		val = PIXEL_ENCODE_FORMAT_DP_ENC0_P0_RGB;
+		break;
+	}
+
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_303C, val,
+			   PIXEL_ENCODE_FORMAT_DP_ENC0_P0_MASK);
+}
+
+static void mtk_dp_set_color_depth(struct mtk_dp *mtk_dp,
+				   enum mtk_dp_color_depth color_depth)
+{
+	u32 val;
+
+	mtk_dp->info.depth = color_depth;
+
+	// Update MISC0
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3034,
+			   color_depth << DP_TEST_BIT_DEPTH_SHIFT,
+			   DP_TEST_BIT_DEPTH_MASK);
+
+	switch (color_depth) {
+	case MTK_DP_COLOR_DEPTH_6BIT:
+		val = VIDEO_COLOR_DEPTH_DP_ENC0_P0_6BIT;
+		break;
+	case MTK_DP_COLOR_DEPTH_8BIT:
+		val = VIDEO_COLOR_DEPTH_DP_ENC0_P0_8BIT;
+		break;
+	case MTK_DP_COLOR_DEPTH_10BIT:
+		val = VIDEO_COLOR_DEPTH_DP_ENC0_P0_10BIT;
+		break;
+	case MTK_DP_COLOR_DEPTH_12BIT:
+		val = VIDEO_COLOR_DEPTH_DP_ENC0_P0_12BIT;
+		break;
+	case MTK_DP_COLOR_DEPTH_16BIT:
+		val = VIDEO_COLOR_DEPTH_DP_ENC0_P0_16BIT;
+		break;
+	case MTK_DP_COLOR_DEPTH_UNKNOWN:
+		drm_warn(mtk_dp->drm_dev, "Unsupported color depth %d\n",
+			 color_depth);
+		return;
+	}
+
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_303C, val,
+			   VIDEO_COLOR_DEPTH_DP_ENC0_P0_MASK);
+}
+
+static void mtk_dp_mn_overwrite_disable(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3004, 0,
+			   VIDEO_M_CODE_SEL_DP_ENC0_P0_MASK);
+}
+
+static void mtk_dp_set_sram_read_start(struct mtk_dp *mtk_dp, u32 val)
+{
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_303C,
+			   val << SRAM_START_READ_THRD_DP_ENC0_P0_SHIFT,
+			   SRAM_START_READ_THRD_DP_ENC0_P0_MASK);
+}
+
+static void mtk_dp_setup_encoder(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_303C,
+			   BIT(VIDEO_MN_GEN_EN_DP_ENC0_P0_SHIFT),
+			   VIDEO_MN_GEN_EN_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3040,
+			   0x20 << SDP_DOWN_CNT_INIT_DP_ENC0_P0_SHIFT,
+			   SDP_DOWN_CNT_INIT_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3364,
+			   0x20 << SDP_DOWN_CNT_INIT_IN_HBLANK_DP_ENC1_P0_SHIFT,
+			   SDP_DOWN_CNT_INIT_IN_HBLANK_DP_ENC1_P0_MASK);
+	// TODO(scosu): 2 is undocumented
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3300,
+			   2 << VIDEO_AFIFO_RDY_SEL_DP_ENC1_P0_SHIFT,
+			   VIDEO_AFIFO_RDY_SEL_DP_ENC1_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3364,
+			   4 << FIFO_READ_START_POINT_DP_ENC1_P0_SHIFT,
+			   FIFO_READ_START_POINT_DP_ENC1_P0_MASK);
+	// TODO(scosu): This sets values that are set at other points as well
+	mtk_dp_write(mtk_dp, MTK_DP_ENC1_P0_3368,
+		     1 << VIDEO_SRAM_FIFO_CNT_RESET_SEL_DP_ENC1_P0_SHIFT |
+			     1 << VIDEO_STABLE_CNT_THRD_DP_ENC1_P0_SHIFT |
+			     BIT(SDP_DP13_EN_DP_ENC1_P0_SHIFT) |
+			     1 << BS2BS_MODE_DP_ENC1_P0_SHIFT);
+}
+
+static void mtk_dp_pg_disable(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3038, 0,
+			   VIDEO_SOURCE_SEL_DP_ENC0_P0_MASK);
+
+	// TODO(scosu): Undocumented
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_31B0, BIT(6), BIT(6));
+}
+
+static void mtk_dp_audio_setup_channels(struct mtk_dp *mtk_dp,
+					struct mtk_dp_audio_cfg *cfg)
+{
+	u32 channel_enable_bits;
+
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3324,
+			   AUDIO_SOURCE_MUX_DP_ENC1_P0_DPRX,
+			   AUDIO_SOURCE_MUX_DP_ENC1_P0_MASK);
+
+	// TODO(scosu): undocumented, what does it do?
+	//audio channel count change reset
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_33F4, BIT(9), BIT(9));
+
+	// TODO(scosu): undocumented what does it do?
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3304,
+			   AU_PRTY_REGEN_DP_ENC1_P0_MASK,
+			   AU_PRTY_REGEN_DP_ENC1_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3304,
+			   AU_CH_STS_REGEN_DP_ENC1_P0_MASK,
+			   AU_CH_STS_REGEN_DP_ENC1_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3304,
+			   AUDIO_SAMPLE_PRSENT_REGEN_DP_ENC1_P0_MASK,
+			   AUDIO_SAMPLE_PRSENT_REGEN_DP_ENC1_P0_MASK);
+
+	switch (cfg->channels) {
+	case 2:
+		channel_enable_bits = AUDIO_2CH_SEL_DP_ENC0_P0_MASK |
+				      AUDIO_2CH_EN_DP_ENC0_P0_MASK;
+		break;
+	case 8:
+	default:
+		channel_enable_bits = AUDIO_8CH_SEL_DP_ENC0_P0_MASK |
+				      AUDIO_8CH_EN_DP_ENC0_P0_MASK;
+		break;
+	}
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3088,
+			   channel_enable_bits | AU_EN_DP_ENC0_P0_MASK,
+			   AUDIO_2CH_SEL_DP_ENC0_P0_MASK |
+			   AUDIO_2CH_EN_DP_ENC0_P0_MASK |
+			   AUDIO_8CH_SEL_DP_ENC0_P0_MASK |
+			   AUDIO_8CH_EN_DP_ENC0_P0_MASK |
+			   AU_EN_DP_ENC0_P0_MASK);
+
+	// TODO(scosu): undocumented, what does it do?
+	//audio channel count change reset
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_33F4, 0, BIT(9));
+
+	// TODO(scosu): undocumented, what does it do?
+	//enable audio reset
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_33F4, BIT(0), BIT(0));
+}
+
+static void mtk_dp_audio_channel_status_set(struct mtk_dp *mtk_dp,
+					    struct mtk_dp_audio_cfg *cfg)
+{
+	union mtk_dp_audio_channel_status channel_status;
+
+	memset(&channel_status, 0, sizeof(channel_status));
+
+	switch (cfg->sample_rate) {
+	case 32000:
+		channel_status.iec.sampling_freq = 3;
+		break;
+	case 44100:
+		channel_status.iec.sampling_freq = 0;
+		break;
+	case 48000:
+		channel_status.iec.sampling_freq = 2;
+		break;
+	case 88200:
+		channel_status.iec.sampling_freq = 8;
+		break;
+	case 96000:
+		channel_status.iec.sampling_freq = 0xA;
+		break;
+	case 192000:
+		channel_status.iec.sampling_freq = 0xE;
+		break;
+	default:
+		channel_status.iec.sampling_freq = 0x1;
+		break;
+	}
+
+	switch (cfg->word_length_bits) {
+	case 16:
+		channel_status.iec.word_len = 0x02;
+		break;
+	case 20:
+		channel_status.iec.word_len = 0x03;
+		break;
+	case 24:
+		channel_status.iec.word_len = 0x0B;
+		break;
+		// TODO(scosu): default?
+	}
+
+	// TODO(scosu): what are these registers, not documented
+	// IEC 60958 consumer channel status bits ?
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_308C,
+			   channel_status.buf[1] << 8 | channel_status.buf[0],
+			   CH_STATUS_0_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3090,
+			   channel_status.buf[3] << 8 | channel_status.buf[2],
+			   CH_STATUS_1_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3094, channel_status.buf[4],
+			   CH_STATUS_2_DP_ENC0_P0_MASK);
+}
+
+static void mtk_dp_audio_sdp_asp_set_channels(struct mtk_dp *mtk_dp,
+					      int channels)
+{
+	if (channels != 2 && channels != 8)
+		channels = 8;
+
+	// TODO(scosu): What is this doing? header bytes for AUI are setup in a
+	// different call. These are ASP header bytes
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_312C,
+			   (channels - 1) << ASP_HB3_DP_ENC0_P0_SHIFT,
+			   ASP_HB2_DP_ENC0_P0_MASK | ASP_HB3_DP_ENC0_P0_MASK);
+}
+
+static void mtk_dp_audio_set_divider(struct mtk_dp *mtk_dp, u8 divider)
+{
+	// TODO(scosu): undocumented register, what does it do?
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_30BC,
+			   divider <<
+			   AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_SHIFT,
+			   AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_MASK);
+}
+
+static bool mtk_dp_plug_state(struct mtk_dp *mtk_dp)
+{
+	return !!(mtk_dp_read(mtk_dp, MTK_DP_TRANS_P0_3414) &
+		  HPD_DB_DP_TRANS_P0_MASK);
+}
+
+static void mtk_dp_sdp_trigger_packet(struct mtk_dp *mtk_dp,
+				      enum mtk_dp_sdp_type type)
+{
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3280, type,
+			   SDP_PACKET_TYPE_DP_ENC1_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3280, SDP_PACKET_W_DP_ENC1_P0,
+			   SDP_PACKET_W_DP_ENC1_P0);
+}
+
+static void mtk_dp_sdp_set_data(struct mtk_dp *mtk_dp, u8 *data_bytes)
+{
+	mtk_dp_bulk_16bit_write(mtk_dp, MTK_DP_ENC1_P0_3200, data_bytes, 0x10);
+}
+
+static void mtk_dp_sdp_set_header(struct mtk_dp *mtk_dp,
+				  enum mtk_dp_sdp_type type,
+				  struct dp_sdp_header *header)
+{
+	u32 db_addr;
+
+	switch (type) {
+	case MTK_DP_SDP_DRM:
+		db_addr = MTK_DP_ENC0_P0_3138;
+		break;
+	case MTK_DP_SDP_PPS0:
+	case MTK_DP_SDP_PPS1:
+	case MTK_DP_SDP_PPS2:
+	case MTK_DP_SDP_PPS3:
+		db_addr = MTK_DP_ENC0_P0_3130;
+		break;
+	default:
+		db_addr = MTK_DP_ENC0_P0_30D8 + (type - MTK_DP_SDP_ACM) * 8;
+	}
+
+	mtk_dp_bulk_16bit_write(mtk_dp, db_addr, (u8 *)header, 4);
+}
+
+// TODO: Does this off by one work?
+static const u32 mtk_dp_sdp_type_to_reg[MTK_DP_SDP_MAX_NUM] = {
+	/* MTK_DP_SDP_NONE => */ 0x0,
+	/* MTK_DP_SDP_ACM  => */ MTK_DP_ENC0_P0_30B4,
+	/* MTK_DP_SDP_ISRC => */ MTK_DP_ENC0_P0_30B4 + 1,
+	/* MTK_DP_SDP_AVI  => */ MTK_DP_ENC0_P0_30A4 + 1,
+	/* MTK_DP_SDP_AUI  => */ MTK_DP_ENC0_P0_30A8,
+	/* MTK_DP_SDP_SPD  => */ MTK_DP_ENC0_P0_30A8 + 1,
+	/* MTK_DP_SDP_MPEG => */ MTK_DP_ENC0_P0_30AC,
+	/* MTK_DP_SDP_NTSC => */ MTK_DP_ENC0_P0_30AC + 1,
+	/* MTK_DP_SDP_VSP  => */ MTK_DP_ENC0_P0_30B0,
+	/* MTK_DP_SDP_VSC  => */ MTK_DP_ENC0_P0_30B8,
+	/* MTK_DP_SDP_EXT  => */ MTK_DP_ENC0_P0_30B0 + 1,
+	/* MTK_DP_SDP_PPS0 => */ MTK_DP_ENC0_P0_31E8,
+	/* MTK_DP_SDP_PPS1 => */ MTK_DP_ENC0_P0_31E8,
+	/* MTK_DP_SDP_PPS2 => */ MTK_DP_ENC0_P0_31E8,
+	/* MTK_DP_SDP_PPS3 => */ MTK_DP_ENC0_P0_31E8,
+	/* MTK_DP_SDP_DRM  => */ MTK_DP_ENC0_P0_31DC,
+};
+
+static void mtk_dp_disable_sdp(struct mtk_dp *mtk_dp,
+			       enum mtk_dp_sdp_type type)
+{
+	if (type == MTK_DP_SDP_NONE)
+		return;
+
+	// Disable periodic send
+	mtk_dp_update_bits(mtk_dp, mtk_dp_sdp_type_to_reg[type], 0, 0xFF);
+}
+
+static void mtk_dp_setup_sdp(struct mtk_dp *mtk_dp,
+			     struct mtk_dp_sdp_packet *packet)
+{
+	mtk_dp_sdp_set_data(mtk_dp, packet->sdp.db);
+	mtk_dp_sdp_set_header(mtk_dp, packet->type, &packet->sdp.sdp_header);
+
+	mtk_dp_disable_sdp(mtk_dp, packet->type);
+
+	switch (packet->type) {
+	case MTK_DP_SDP_NONE:
+		break;
+	case MTK_DP_SDP_ISRC:
+		// TODO(scosu): check what 0x1c is
+		mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_31EC,
+				   0x1C << ISRC1_HB3_DP_ENC0_P0_SHIFT,
+				   ISRC1_HB3_DP_ENC0_P0_MASK);
+		mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3280, MTK_DP_SDP_ISRC,
+				   SDP_PACKET_TYPE_DP_ENC1_P0_MASK);
+
+		if (packet->sdp.sdp_header.HB3 & BIT(2))
+			mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_30BC,
+					   BIT(ISRC_CONT_DP_ENC0_P0_SHIFT),
+					   ISRC_CONT_DP_ENC0_P0_MASK);
+		else
+			mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_30BC, 0,
+					   ISRC_CONT_DP_ENC0_P0_MASK);
+
+		mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3280,
+				   SDP_PACKET_W_DP_ENC1_P0,
+				   SDP_PACKET_W_DP_ENC1_P0);
+		mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_30B4,
+				   5 << ISRC_CFG_DP_ENC0_P0_SHIFT,
+				   ISRC_CFG_DP_ENC0_P0_MASK);
+		break;
+	case MTK_DP_SDP_DRM:
+		mtk_dp_sdp_trigger_packet(mtk_dp, packet->type);
+		mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_31DC,
+				   5 << HDR0_CFG_DP_ENC0_P0_SHIFT,
+				   HDR0_CFG_DP_ENC0_P0_MASK);
+		break;
+	case MTK_DP_SDP_ACM:
+	case MTK_DP_SDP_AVI:
+	case MTK_DP_SDP_AUI:
+	case MTK_DP_SDP_SPD:
+	case MTK_DP_SDP_MPEG:
+	case MTK_DP_SDP_NTSC:
+	case MTK_DP_SDP_VSP:
+	case MTK_DP_SDP_VSC:
+	case MTK_DP_SDP_EXT:
+	case MTK_DP_SDP_PPS0:
+	case MTK_DP_SDP_PPS1:
+	case MTK_DP_SDP_PPS2:
+	case MTK_DP_SDP_PPS3:
+		mtk_dp_sdp_trigger_packet(mtk_dp, packet->type);
+		// Enable periodic sending
+		mtk_dp_update_bits(mtk_dp, mtk_dp_sdp_type_to_reg[packet->type],
+				   0x05, 0xff);
+		break;
+	default:
+		break;
+	}
+}
+
+static void mtk_dp_sdp_vsc_ext_disable(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_30A0, 0,
+			   BIT(7) | BIT(8) | BIT(12));
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_328C, 0, BIT(7));
+}
+
+static void mtk_dp_aux_irq_clear(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_write(mtk_dp, MTK_DP_AUX_P0_3640,
+		     BIT(AUX_400US_TIMEOUT_IRQ_AUX_TX_P0_SHIFT) |
+		     BIT(AUX_RX_DATA_RECV_IRQ_AUX_TX_P0_SHIFT) |
+		     BIT(AUX_RX_ADDR_RECV_IRQ_AUX_TX_P0_SHIFT) |
+		     BIT(AUX_RX_CMD_RECV_IRQ_AUX_TX_P0_SHIFT) |
+		     BIT(AUX_RX_MCCS_RECV_COMPLETE_IRQ_AUX_TX_P0_SHIFT) |
+		     BIT(AUX_RX_EDID_RECV_COMPLETE_IRQ_AUX_TX_P0_SHIFT) |
+		     BIT(AUX_RX_AUX_RECV_COMPLETE_IRQ_AUX_TX_P0_SHIFT));
+}
+
+static void mtk_dp_aux_set_cmd(struct mtk_dp *mtk_dp, u8 cmd, u32 addr)
+{
+	mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_3644, cmd,
+			   MCU_REQUEST_COMMAND_AUX_TX_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_3648, addr,
+			   MCU_REQUEST_ADDRESS_LSB_AUX_TX_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_364C, addr >> 16,
+			   MCU_REQUEST_ADDRESS_MSB_AUX_TX_P0_MASK);
+}
+
+static void mtk_dp_aux_cmd_complete(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_3650,
+			   BIT(MCU_ACK_TRAN_COMPLETE_AUX_TX_P0_SHIFT),
+			   MCU_ACK_TRAN_COMPLETE_AUX_TX_P0_MASK |
+				   PHY_FIFO_RST_AUX_TX_P0_MASK |
+				   MCU_REQ_DATA_NUM_AUX_TX_P0_MASK);
+}
+
+static void mtk_dp_aux_request_ready(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_3630,
+			   BIT(AUX_TX_REQUEST_READY_AUX_TX_P0_SHIFT),
+			   AUX_TX_REQUEST_READY_AUX_TX_P0_MASK);
+}
+
+static void mtk_dp_aux_fill_write_fifo(struct mtk_dp *mtk_dp, u8 *buf,
+				       size_t length)
+{
+	mtk_dp_bulk_16bit_write(mtk_dp, MTK_DP_AUX_P0_3708, buf, length);
+}
+
+static void mtk_dp_aux_read_rx_fifo(struct mtk_dp *mtk_dp, u8 *buf,
+				    size_t length, int read_delay)
+{
+	int read_pos;
+
+	mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_3620, 0,
+			   AUX_RD_MODE_AUX_TX_P0_MASK);
+
+	for (read_pos = 0; read_pos < length; read_pos++) {
+		mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_3620,
+				   BIT(AUX_RX_FIFO_R_PULSE_TX_P0_SHIFT),
+				   AUX_RX_FIFO_READ_PULSE_TX_P0_MASK);
+		usleep_range(read_delay, read_delay * 2);
+		buf[read_pos] =
+			(u8)(mtk_dp_read(mtk_dp, MTK_DP_AUX_P0_3620) &
+			     AUX_RX_FIFO_READ_DATA_AUX_TX_P0_MASK >>
+				     AUX_RX_FIFO_READ_DATA_AUX_TX_P0_SHIFT);
+	}
+}
+
+static void mtk_dp_aux_set_length(struct mtk_dp *mtk_dp, size_t length)
+{
+	if (length > 0) {
+		mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_3650,
+				   (length - 1)
+					   << MCU_REQ_DATA_NUM_AUX_TX_P0_SHIFT,
+				   MCU_REQ_DATA_NUM_AUX_TX_P0_MASK);
+		mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_362C, 0,
+				   AUX_NO_LENGTH_AUX_TX_P0_MASK |
+					   AUX_TX_AUXTX_OV_EN_AUX_TX_P0_MASK |
+					   AUX_RESERVED_RW_0_AUX_TX_P0_MASK);
+	} else {
+		mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_362C,
+				   BIT(AUX_NO_LENGTH_AUX_TX_P0_SHIFT),
+				   AUX_NO_LENGTH_AUX_TX_P0_MASK |
+					   AUX_TX_AUXTX_OV_EN_AUX_TX_P0_MASK |
+					   AUX_RESERVED_RW_0_AUX_TX_P0_MASK);
+	}
+}
+
+static int mtk_dp_aux_wait_for_completion(struct mtk_dp *mtk_dp, bool is_read)
+{
+	int wait_reply = MTK_DP_AUX_WAIT_REPLY_COUNT;
+
+	while (--wait_reply) {
+		u32 aux_irq_status;
+
+		if (is_read) {
+			u32 fifo_status =
+				mtk_dp_read(mtk_dp, MTK_DP_AUX_P0_3618);
+
+			if (fifo_status &
+			    (AUX_RX_FIFO_WRITE_POINTER_AUX_TX_P0_MASK |
+			     AUX_RX_FIFO_FULL_AUX_TX_P0_MASK)) {
+				return 0;
+			}
+		}
+
+		aux_irq_status = mtk_dp_read(mtk_dp, MTK_DP_AUX_P0_3640);
+		if (aux_irq_status & AUX_RX_RECV_COMPLETE_IRQ_TX_P0_MASK)
+			return 0;
+
+		if (aux_irq_status & AUX_400US_TIMEOUT_IRQ_AUX_TX_P0_MASK)
+			return -ETIMEDOUT;
+
+		usleep_range(1000, 5000);
+	}
+
+	return -ETIMEDOUT;
+}
+
+static int mtk_dp_aux_do_transfer(struct mtk_dp *mtk_dp, bool is_read, u8 cmd,
+				  u32 addr, u8 *buf, size_t length)
+{
+	int ret;
+	u32 reply_cmd;
+
+	if (is_read && (length > DP_AUX_MAX_PAYLOAD_BYTES ||
+			(cmd == DP_AUX_NATIVE_READ && !length)))
+		return -EINVAL;
+
+	if (!is_read)
+		mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_3704,
+				   BIT(AUX_TX_FIFO_NEW_MODE_EN_AUX_TX_P0_SHIFT),
+				   AUX_TX_FIFO_NEW_MODE_EN_AUX_TX_P0_MASK);
+
+	mtk_dp_aux_cmd_complete(mtk_dp);
+	mtk_dp_aux_irq_clear(mtk_dp);
+	usleep_range(MTK_DP_AUX_WRITE_READ_WAIT_TIME_US,
+		     MTK_DP_AUX_WRITE_READ_WAIT_TIME_US * 2);
+
+	mtk_dp_aux_set_cmd(mtk_dp, cmd, addr);
+	mtk_dp_aux_set_length(mtk_dp, length);
+
+	if (!is_read) {
+		if (length)
+			mtk_dp_aux_fill_write_fifo(mtk_dp, buf, length);
+
+		mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_3704,
+				   AUX_TX_FIFO_WRITE_DATA_NEW_MODE_TOGGLE_AUX_TX_P0_MASK,
+				   AUX_TX_FIFO_WRITE_DATA_NEW_MODE_TOGGLE_AUX_TX_P0_MASK);
+	}
+
+	mtk_dp_aux_request_ready(mtk_dp);
+
+	ret = mtk_dp_aux_wait_for_completion(mtk_dp, is_read);
+
+	reply_cmd = mtk_dp_read(mtk_dp, MTK_DP_AUX_P0_3624) &
+		    AUX_RX_REPLY_COMMAND_AUX_TX_P0_MASK;
+	if (ret || reply_cmd) {
+		u32 phy_status = mtk_dp_read(mtk_dp, MTK_DP_AUX_P0_3628) &
+				 AUX_RX_PHY_STATE_AUX_TX_P0_MASK;
+		if (phy_status != AUX_RX_PHY_STATE_AUX_TX_P0_RX_IDLE) {
+			drm_err(mtk_dp->drm_dev,
+				"AUX Rx Aux hang, need SW reset\n");
+			ret = -EIO;
+		}
+
+		mtk_dp_aux_cmd_complete(mtk_dp);
+		mtk_dp_aux_irq_clear(mtk_dp);
+
+		usleep_range(MTK_DP_AUX_WRITE_READ_WAIT_TIME_US,
+			     MTK_DP_AUX_WRITE_READ_WAIT_TIME_US * 2);
+		return ret;
+	}
+
+	if (!length) {
+		mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_362C, 0,
+				   AUX_NO_LENGTH_AUX_TX_P0_MASK |
+					   AUX_TX_AUXTX_OV_EN_AUX_TX_P0_MASK |
+					   AUX_RESERVED_RW_0_AUX_TX_P0_MASK);
+	} else if (is_read) {
+		int read_delay;
+
+		if (cmd == (DP_AUX_I2C_READ | DP_AUX_I2C_MOT) ||
+		    cmd == DP_AUX_I2C_READ)
+			read_delay = 500;
+		else
+			read_delay = 100;
+
+		mtk_dp_aux_read_rx_fifo(mtk_dp, buf, length, read_delay);
+	}
+
+	mtk_dp_aux_cmd_complete(mtk_dp);
+	mtk_dp_aux_irq_clear(mtk_dp);
+	usleep_range(MTK_DP_AUX_WRITE_READ_WAIT_TIME_US,
+		     MTK_DP_AUX_WRITE_READ_WAIT_TIME_US * 2);
+
+	return 0;
+}
+
+static bool mtk_dp_set_swing_pre_emphasis(struct mtk_dp *mtk_dp, int lane_num,
+					  int swing_val, int preemphasis)
+{
+	u32 lane_shift = lane_num * DP_TX1_VOLT_SWING_SHIFT;
+
+	if (lane_num < 0 || lane_num > 3)
+		return false;
+
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_SWING_EMP,
+			   swing_val << (DP_TX0_VOLT_SWING_SHIFT + lane_shift),
+			   DP_TX0_VOLT_SWING_MASK << lane_shift);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_SWING_EMP,
+			   preemphasis << (DP_TX0_PRE_EMPH_SHIFT + lane_shift),
+			   DP_TX0_PRE_EMPH_MASK << lane_shift);
+
+	return true;
+}
+
+static void mtk_dp_reset_swing_pre_emphasis(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_SWING_EMP, 0,
+			   DP_TX0_VOLT_SWING_MASK | DP_TX1_VOLT_SWING_MASK |
+				   DP_TX2_VOLT_SWING_MASK |
+				   DP_TX3_VOLT_SWING_MASK |
+				   DP_TX0_PRE_EMPH_MASK | DP_TX1_PRE_EMPH_MASK |
+				   DP_TX2_PRE_EMPH_MASK | DP_TX3_PRE_EMPH_MASK);
+}
+
+static void mtk_dp_fec_enable(struct mtk_dp *mtk_dp, bool enable)
+{
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3540,
+			   enable ? BIT(FEC_EN_DP_TRANS_P0_SHIFT) : 0,
+			   FEC_EN_DP_TRANS_P0_MASK);
+}
+
+static u32 mtk_dp_swirq_get_clear(struct mtk_dp *mtk_dp)
+{
+	// TODO(scosu): documentation about register for SW irq is missing
+	u32 irq_status = mtk_dp_read(mtk_dp, MTK_DP_TRANS_P0_35D0) &
+			 SW_IRQ_FINAL_STATUS_DP_TRANS_P0_MASK;
+
+	if (irq_status) {
+		mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_35C8, irq_status,
+				   SW_IRQ_CLR_DP_TRANS_P0_MASK);
+		mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_35C8, 0,
+				   SW_IRQ_CLR_DP_TRANS_P0_MASK);
+	}
+
+	return irq_status;
+}
+
+static u32 mtk_dp_hwirq_get_clear(struct mtk_dp *mtk_dp)
+{
+	u8 irq_status = (mtk_dp_read(mtk_dp, MTK_DP_TRANS_P0_3418) &
+			 IRQ_STATUS_DP_TRANS_P0_MASK) >>
+			IRQ_STATUS_DP_TRANS_P0_SHIFT;
+
+	if (irq_status) {
+		mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3418, irq_status,
+				   IRQ_CLR_DP_TRANS_P0_MASK);
+		mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3418, 0,
+				   IRQ_CLR_DP_TRANS_P0_MASK);
+	}
+
+	return irq_status;
+}
+
+static void mtk_dp_hwirq_enable(struct mtk_dp *mtk_dp, bool enable)
+{
+	u32 val = 0;
+
+	if (!enable)
+		val = IRQ_MASK_DP_TRANS_P0_DISC_IRQ |
+		      IRQ_MASK_DP_TRANS_P0_CONN_IRQ |
+		      IRQ_MASK_DP_TRANS_P0_INT_IRQ;
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3418, val,
+			   IRQ_MASK_DP_TRANS_P0_MASK);
+}
+
+void mtk_dp_initialize_settings(struct mtk_dp *mtk_dp)
+{
+	// TODO(scosu): where does this default come from?
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_342C,
+			   XTAL_FREQ_DP_TRANS_P0_DEFAULT,
+			   XTAL_FREQ_DP_TRANS_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3540,
+			   BIT(FEC_CLOCK_EN_MODE_DP_TRANS_P0_SHIFT),
+			   FEC_CLOCK_EN_MODE_DP_TRANS_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_31EC,
+			   BIT(AUDIO_CH_SRC_SEL_DP_ENC0_P0_SHIFT),
+			   AUDIO_CH_SRC_SEL_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_304C, 0,
+			   SDP_VSYNC_RISING_MASK_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_IRQ_MASK, IRQ_MASK_AUX_TOP_IRQ,
+			   IRQ_MASK_AUX_TOP_IRQ);
+}
+
+static void mtk_dp_initialize_hpd_detect_settings(struct mtk_dp *mtk_dp)
+{
+	// Debounce threshold
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3410,
+			   8 << HPD_DEB_THD_DP_TRANS_P0_SHIFT,
+			   HPD_DEB_THD_DP_TRANS_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3410,
+			   (HPD_INT_THD_DP_TRANS_P0_LOWER_500US |
+			    HPD_INT_THD_DP_TRANS_P0_UPPER_1100US)
+				   << HPD_INT_THD_DP_TRANS_P0_SHIFT,
+			   HPD_INT_THD_DP_TRANS_P0_MASK);
+
+	// Connect threshold 1.5ms + 5 x 0.1ms = 2ms
+	// Disconnect threshold 1.5ms + 5 x 0.1ms = 2ms
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3410,
+			   (5 << HPD_DISC_THD_DP_TRANS_P0_SHIFT) |
+				   (5 << HPD_CONN_THD_DP_TRANS_P0_SHIFT),
+			   HPD_DISC_THD_DP_TRANS_P0_MASK |
+				   HPD_CONN_THD_DP_TRANS_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3430,
+			   HPD_INT_THD_ECO_DP_TRANS_P0_HIGH_BOUND_EXT,
+			   HPD_INT_THD_ECO_DP_TRANS_P0_MASK);
+}
+
+static void mtk_dp_initialize_aux_settings(struct mtk_dp *mtk_dp)
+{
+	// modify timeout threshold = 1595 [12 : 8]
+	mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_360C, 0x1595,
+			   AUX_TIMEOUT_THR_AUX_TX_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_3658, 0,
+			   AUX_TX_OV_EN_AUX_TX_P0_MASK);
+	// 25 for 26M
+	mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_3634,
+			   25 << AUX_TX_OVER_SAMPLE_RATE_AUX_TX_P0_SHIFT,
+			   AUX_TX_OVER_SAMPLE_RATE_AUX_TX_P0_MASK);
+	// 13 for 26M
+	mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_3614,
+			   13 << AUX_RX_UI_CNT_THR_AUX_TX_P0_SHIFT,
+			   AUX_RX_UI_CNT_THR_AUX_TX_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_37C8,
+			   BIT(MTK_ATOP_EN_AUX_TX_P0_SHIFT),
+			   MTK_ATOP_EN_AUX_TX_P0_MASK);
+}
+
+static void mtk_dp_initialize_digital_settings(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_304C, 0,
+			   VBID_VIDEO_MUTE_DP_ENC0_P0_MASK);
+	mtk_dp_set_color_format(mtk_dp, MTK_DP_COLOR_FORMAT_RGB_444);
+	mtk_dp_set_color_depth(mtk_dp, MTK_DP_COLOR_DEPTH_8BIT);
+	// TODO(scosu): unexplained register
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3368,
+			   1 << BS2BS_MODE_DP_ENC1_P0_SHIFT,
+			   BS2BS_MODE_DP_ENC1_P0_MASK);
+
+	// dp tx encoder reset all sw
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3004,
+			   BIT(DP_TX_ENCODER_4P_RESET_SW_DP_ENC0_P0_SHIFT),
+			   DP_TX_ENCODER_4P_RESET_SW_DP_ENC0_P0_MASK);
+	usleep_range(1000, 5000);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3004, 0,
+			   DP_TX_ENCODER_4P_RESET_SW_DP_ENC0_P0_MASK);
+}
+
+static void mtk_dp_digital_sw_reset(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_340C,
+			   BIT(DP_TX_TRANSMITTER_4P_RESET_SW_DP_TRANS_P0_SHIFT),
+			   DP_TX_TRANSMITTER_4P_RESET_SW_DP_TRANS_P0_MASK);
+	usleep_range(1000, 5000);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_340C, 0,
+			   DP_TX_TRANSMITTER_4P_RESET_SW_DP_TRANS_P0_MASK);
+}
+
+static void mtk_dp_set_lanes(struct mtk_dp *mtk_dp, int lanes)
+{
+	// TODO(scosu): undocumented bits
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_35F0,
+			   lanes == 0 ? 0 : BIT(3), BIT(3) | BIT(2));
+
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3000, lanes,
+			   LANE_NUM_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_34A4,
+			   lanes << LANE_NUM_DP_TRANS_P0_SHIFT,
+			   LANE_NUM_DP_TRANS_P0_MASK);
+}
+
+static int link_rate_to_mb_per_s(struct mtk_dp *mtk_dp,
+				 enum mtk_dp_linkrate linkrate)
+{
+	switch (linkrate) {
+	default:
+		drm_err(mtk_dp->drm_dev,
+			"Implementation error, unknown linkrate %d\n",
+			linkrate);
+		fallthrough;
+	case MTK_DP_LINKRATE_RBR:
+		return 1620;
+	case MTK_DP_LINKRATE_HBR:
+		return 2700;
+	case MTK_DP_LINKRATE_HBR2:
+		return 5400;
+	case MTK_DP_LINKRATE_HBR3:
+		return 8100;
+	}
+}
+
+static int mtk_dp_phy_configure(struct mtk_dp *mtk_dp,
+				 enum mtk_dp_linkrate link_rate, int lane_count)
+{
+	int ret;
+	union phy_configure_opts phy_opts = {
+		.dp = {
+			.link_rate = link_rate_to_mb_per_s(mtk_dp, link_rate),
+			.set_rate = 1,
+			.lanes = lane_count,
+			.set_lanes = 1,
+			.ssc = mtk_dp->train_info.sink_ssc,
+		}
+	};
+
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE, DP_PWR_STATE_BANDGAP,
+			   DP_PWR_STATE_MASK);
+
+	ret = phy_configure(mtk_dp->phy, &phy_opts);
+
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
+			   DP_PWR_STATE_BANDGAP_TPLL_LANE, DP_PWR_STATE_MASK);
+	return ret;
+}
+
+static void mtk_dp_set_idle_pattern(struct mtk_dp *mtk_dp, bool enable)
+{
+	const u32 val = POST_MISC_DATA_LANE0_OV_DP_TRANS_P0_MASK |
+			POST_MISC_DATA_LANE1_OV_DP_TRANS_P0_MASK |
+			POST_MISC_DATA_LANE2_OV_DP_TRANS_P0_MASK |
+			POST_MISC_DATA_LANE3_OV_DP_TRANS_P0_MASK;
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3580, enable ? val : 0, val);
+}
+
+static void mtk_dp_train_set_pattern(struct mtk_dp *mtk_dp, int pattern)
+{
+	if (pattern < 0 || pattern > 4) {
+		drm_err(mtk_dp->drm_dev,
+			"Implementation error, no such pattern %d\n", pattern);
+		return;
+	}
+
+	if (pattern == 1) // TPS1
+		mtk_dp_set_idle_pattern(mtk_dp, false);
+
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3400,
+			   pattern ?
+			   BIT(pattern - 1) << PATTERN1_EN_DP_TRANS_P0_SHIFT :
+			   0,
+			   PATTERN1_EN_DP_TRANS_P0_MASK |
+			   PATTERN2_EN_DP_TRANS_P0_MASK |
+			   PATTERN3_EN_DP_TRANS_P0_MASK |
+			   PATTERN4_EN_DP_TRANS_P0_MASK);
+}
+
+static void mtk_dp_set_enhanced_frame_mode(struct mtk_dp *mtk_dp, bool enable)
+{
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3000,
+			   enable ? BIT(ENHANCED_FRAME_EN_DP_ENC0_P0_SHIFT) : 0,
+			   ENHANCED_FRAME_EN_DP_ENC0_P0_MASK);
+}
+
+static void mtk_dp_training_set_scramble(struct mtk_dp *mtk_dp, bool enable)
+{
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3404,
+			   enable ? DP_SCR_EN_DP_TRANS_P0_MASK : 0,
+			   DP_SCR_EN_DP_TRANS_P0_MASK);
+}
+
+static void mtk_dp_video_mute(struct mtk_dp *mtk_dp, bool enable)
+{
+	u32 val = BIT(VIDEO_MUTE_SEL_DP_ENC0_P0_SHIFT);
+
+	if (enable)
+		val |= BIT(VIDEO_MUTE_SW_DP_ENC0_P0_SHIFT);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3000, val,
+			   VIDEO_MUTE_SEL_DP_ENC0_P0_MASK |
+				   VIDEO_MUTE_SW_DP_ENC0_P0_MASK);
+
+	if (mtk_dp->driver_data->is_edp)
+		mtk_dp_sip_atf_call(MTK_DP_SIP_ATF_EDP_VIDEO_UNMUTE, enable);
+	else
+		mtk_dp_sip_atf_call(MTK_DP_SIP_ATF_VIDEO_UNMUTE, enable);
+}
+
+static void mtk_dp_audio_mute(struct mtk_dp *mtk_dp, bool mute)
+{
+	if (mute) {
+		mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3030,
+				   BIT(VBID_AUDIO_MUTE_SW_DP_ENC0_P0_SHIFT) |
+				   BIT(VBID_AUDIO_MUTE_SEL_DP_ENC0_P0_SHIFT),
+				   VBID_AUDIO_MUTE_FLAG_SW_DP_ENC0_P0_MASK |
+				   VBID_AUDIO_MUTE_FLAG_SEL_DP_ENC0_P0_MASK);
+
+		mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3088, 0,
+				   AU_EN_DP_ENC0_P0_MASK);
+		mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_30A4, 0,
+				   AU_TS_CFG_DP_ENC0_P0_MASK);
+
+	} else {
+		mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3030, 0,
+				   VBID_AUDIO_MUTE_FLAG_SW_DP_ENC0_P0_MASK |
+				   VBID_AUDIO_MUTE_FLAG_SEL_DP_ENC0_P0_MASK);
+
+		mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3088,
+				   BIT(AU_EN_DP_ENC0_P0_SHIFT),
+				   AU_EN_DP_ENC0_P0_MASK);
+		// Send one every two frames
+		mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_30A4, 0x0F,
+				   AU_TS_CFG_DP_ENC0_P0_MASK);
+	}
+}
+
+static void mtk_dp_power_enable(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_RESET_AND_PROBE, 0,
+			   SW_RST_B_PHYD);
+	usleep_range(10, 200);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_RESET_AND_PROBE, SW_RST_B_PHYD,
+			   SW_RST_B_PHYD);
+}
+
+static void mtk_dp_power_disable(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_write(mtk_dp, MTK_DP_TOP_PWR_STATE, 0);
+	usleep_range(10, 200);
+	// TODO(scosu): not documented, what does it do?
+	mtk_dp_write(mtk_dp, 0x0034, 0x4AA);
+	// TODO(scosu): 1040 disables RX probably
+	mtk_dp_write(mtk_dp, 0x1040, 0x0);
+	// TODO(scosu): 0x550 not documented?
+	mtk_dp_write(mtk_dp, MTK_DP_TOP_MEM_PD,
+		     0x550 | BIT(FUSE_SEL_SHIFT) | BIT(MEM_ISO_EN_SHIFT));
+}
+
+static void mtk_dp_initialize_priv_data(struct mtk_dp *mtk_dp)
+{
+	mtk_dp->train_info.link_rate = MTK_DP_LINKRATE_HBR2;
+	mtk_dp->train_info.lane_count = MTK_DP_MAX_LANES;
+	mtk_dp->train_info.irq_status = 0;
+	mtk_dp->train_info.cable_plugged_in = false;
+	mtk_dp->train_info.cable_state_change = false;
+	mtk_dp->train_state = MTK_DP_TRAIN_STATE_STARTUP;
+	mtk_dp->state = MTK_DP_STATE_INITIAL;
+
+	mtk_dp->info.format = MTK_DP_COLOR_FORMAT_RGB_444;
+	mtk_dp->info.depth = MTK_DP_COLOR_DEPTH_8BIT;
+	memset(&mtk_dp->info.timings, 0, sizeof(struct mtk_dp_timings));
+	mtk_dp->info.timings.frame_rate = 60;
+
+	mtk_dp->has_fec = false;
+	mtk_dp->audio_enable = false;
+}
+
+static void mtk_dp_sdp_set_down_cnt_init(struct mtk_dp *mtk_dp,
+					 u32 sram_read_start)
+{
+	u32 sdp_down_cnt_init = 0;
+	u32 dc_offset;
+
+	if (mtk_dp->info.timings.pix_rate_khz > 0)
+		sdp_down_cnt_init = sram_read_start *
+				    mtk_dp->train_info.link_rate * 2700 * 8 /
+				    (mtk_dp->info.timings.pix_rate_khz * 4);
+
+	switch (mtk_dp->train_info.lane_count) {
+	case 1:
+		sdp_down_cnt_init = sdp_down_cnt_init > 0x1A ?
+			sdp_down_cnt_init : 0x1A;  //26
+		break;
+	case 2:
+		// case for LowResolution && High Audio Sample Rate
+		dc_offset = mtk_dp->info.timings.vtotal <= 525 ?
+			0x04 : 0x00;
+		sdp_down_cnt_init = sdp_down_cnt_init > 0x10 ?
+			sdp_down_cnt_init : 0x10 + dc_offset; //20 or 16
+		break;
+	case 4:
+	default:
+		sdp_down_cnt_init = sdp_down_cnt_init > 0x06 ?
+			sdp_down_cnt_init : 0x06; //6
+		break;
+	}
+
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3040,
+			   sdp_down_cnt_init
+				   << SDP_DOWN_CNT_INIT_DP_ENC0_P0_SHIFT,
+			   SDP_DOWN_CNT_INIT_DP_ENC0_P0_MASK);
+}
+
+static void mtk_dp_sdp_set_down_cnt_init_in_hblank(struct mtk_dp *mtk_dp)
+{
+	int pix_clk_mhz;
+	u32 dc_offset;
+	u32 spd_down_cnt_init = 0;
+
+	pix_clk_mhz = mtk_dp->info.format == MTK_DP_COLOR_FORMAT_YUV_420 ?
+				    mtk_dp->info.timings.pix_rate_khz / 2000 :
+				    mtk_dp->info.timings.pix_rate_khz / 1000;
+
+	switch (mtk_dp->train_info.lane_count) {
+	case 1:
+		spd_down_cnt_init = 0x20;
+		break;
+	case 2:
+		dc_offset = (mtk_dp->info.timings.vtotal <= 525) ? 0x14 : 0x00;
+		spd_down_cnt_init = 0x18 + dc_offset;
+		break;
+	case 4:
+	default:
+		dc_offset = (mtk_dp->info.timings.vtotal <= 525) ? 0x08 : 0x00;
+		if (pix_clk_mhz > mtk_dp->train_info.link_rate * 27)
+			spd_down_cnt_init = 0x8;
+		else
+			spd_down_cnt_init = 0x10 + dc_offset;
+		break;
+	}
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3364, spd_down_cnt_init,
+			   SDP_DOWN_CNT_INIT_IN_HBLANK_DP_ENC1_P0_MASK);
+}
+
+static void mtk_dp_setup_tu(struct mtk_dp *mtk_dp)
+{
+	u32 sram_read_start = MTK_DP_TBC_BUF_READ_START_ADDR;
+
+	if (mtk_dp->train_info.lane_count > 0) {
+		sram_read_start =
+			min_t(u32, MTK_DP_TBC_BUF_READ_START_ADDR,
+			      mtk_dp->info.timings.vm.hactive /
+				      (mtk_dp->train_info.lane_count *
+				       4 * 2 * 2));
+		mtk_dp_set_sram_read_start(mtk_dp, sram_read_start);
+	}
+
+	mtk_dp_setup_encoder(mtk_dp);
+	mtk_dp_sdp_set_down_cnt_init_in_hblank(mtk_dp);
+	mtk_dp_sdp_set_down_cnt_init(mtk_dp, sram_read_start);
+}
+
+static void mtk_dp_calculate_pixrate(struct mtk_dp *mtk_dp)
+{
+	int target_frame_rate = 60;
+	int target_pixel_clk;
+
+	if (mtk_dp->info.timings.frame_rate > 0) {
+		target_frame_rate = mtk_dp->info.timings.frame_rate;
+		target_pixel_clk = (int)mtk_dp->info.timings.htotal *
+				   (int)mtk_dp->info.timings.vtotal *
+				   target_frame_rate;
+	} else if (mtk_dp->info.timings.pix_rate_khz > 0) {
+		target_pixel_clk = mtk_dp->info.timings.pix_rate_khz * 1000;
+	} else {
+		target_pixel_clk = (int)mtk_dp->info.timings.htotal *
+				   (int)mtk_dp->info.timings.vtotal *
+				   target_frame_rate;
+	}
+
+	if (target_pixel_clk > 0)
+		mtk_dp->info.timings.pix_rate_khz = target_pixel_clk / 1000;
+}
+
+static void mtk_dp_set_tx_out(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_msa_bypass_disable(mtk_dp);
+	mtk_dp_calculate_pixrate(mtk_dp);
+	mtk_dp_pg_disable(mtk_dp);
+	mtk_dp_setup_tu(mtk_dp);
+}
+
+static void mtk_dp_edid_free(struct mtk_dp *mtk_dp)
+{
+	mutex_lock(&mtk_dp->edid_lock);
+	kfree(mtk_dp->edid);
+	mtk_dp->edid = NULL;
+	mutex_unlock(&mtk_dp->edid_lock);
+}
+
+static void mtk_dp_hpd_sink_event(struct mtk_dp *mtk_dp)
+{
+	ssize_t ret;
+	u8 sink_count;
+	u8 link_status[DP_LINK_STATUS_SIZE] = {};
+	u32 sink_count_reg;
+	u32 link_status_reg;
+	bool locked;
+
+	sink_count_reg = DP_SINK_COUNT_ESI;
+	link_status_reg = DP_LANE0_1_STATUS_ESI;
+
+	ret = drm_dp_dpcd_readb(&mtk_dp->aux, sink_count_reg, &sink_count);
+	if (ret < 0) {
+		drm_info(mtk_dp->drm_dev,
+			 "Read sink count failed: %ld\n", ret);
+		return;
+	}
+
+	ret = drm_dp_dpcd_readb(&mtk_dp->aux, DP_SINK_COUNT, &sink_count);
+	if (ret < 0) {
+		drm_info(mtk_dp->drm_dev,
+			 "Read DP_SINK_COUNT_ESI failed: %ld\n", ret);
+		return;
+	}
+
+	ret = drm_dp_dpcd_read(&mtk_dp->aux, link_status_reg, link_status,
+			       sizeof(link_status));
+	if (!ret) {
+		drm_info(mtk_dp->drm_dev, "Read link status failed: %ld\n",
+			 ret);
+		return;
+	}
+
+	locked = drm_dp_channel_eq_ok(link_status,
+				      mtk_dp->train_info.lane_count);
+	if (!locked && mtk_dp->train_state > MTK_DP_TRAIN_STATE_TRAINING_PRE)
+		mtk_dp->train_state = MTK_DP_TRAIN_STATE_TRAINING_PRE;
+
+	if (link_status[1] & DP_REMOTE_CONTROL_COMMAND_PENDING)
+		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_DEVICE_SERVICE_IRQ_VECTOR,
+				   DP_REMOTE_CONTROL_COMMAND_PENDING);
+
+	if (DP_GET_SINK_COUNT(sink_count) &&
+	    (link_status[2] & DP_DOWNSTREAM_PORT_STATUS_CHANGED)) {
+		mtk_dp_edid_free(mtk_dp);
+		mtk_dp->train_info.check_cap_count = 0;
+		mtk_dp->train_state = MTK_DP_TRAIN_STATE_CHECKEDID;
+		msleep(20);
+	}
+}
+
+static void mtk_dp_sdp_stop_sending(struct mtk_dp *mtk_dp)
+{
+	u8 packet_type;
+
+	for (packet_type = MTK_DP_SDP_ACM; packet_type < MTK_DP_SDP_MAX_NUM;
+	     packet_type++)
+		mtk_dp_disable_sdp(mtk_dp, packet_type);
+
+	mtk_dp_sdp_vsc_ext_disable(mtk_dp);
+}
+
+static int mtk_dp_train_hpd_handle(struct mtk_dp *mtk_dp)
+{
+	int ret = 0;
+
+	if (mtk_dp->train_info.cable_state_change) {
+		mtk_dp->train_info.cable_state_change = false;
+
+		if (!mtk_dp->train_info.cable_plugged_in ||
+		    !mtk_dp_plug_state(mtk_dp)) {
+			mtk_dp_video_mute(mtk_dp, true);
+			mtk_dp_audio_mute(mtk_dp, true);
+
+			mtk_dp_initialize_priv_data(mtk_dp);
+			mtk_dp_set_idle_pattern(mtk_dp, true);
+			if (mtk_dp->has_fec)
+				mtk_dp_fec_enable(mtk_dp, false);
+			mtk_dp_sdp_stop_sending(mtk_dp);
+			mtk_dp_power_disable(mtk_dp);
+			clk_disable_unprepare(mtk_dp->dp_tx_clk);
+
+			mtk_dp_edid_free(mtk_dp);
+
+			ret = -ENODEV;
+		}
+	}
+
+	return ret;
+}
+
+static void mtk_dp_train_update_swing_pre(struct mtk_dp *mtk_dp, int lanes,
+					  u8 dpcd_adjust_req[2])
+{
+	int lane;
+
+	for (lane = 0; lane < lanes; ++lane) {
+		u8 val;
+		u8 swing;
+		u8 preemphasis;
+		int index = lane / 2;
+		int shift = lane % 2 ? DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT : 0;
+
+		swing = (dpcd_adjust_req[index] >> shift) &
+			DP_ADJUST_VOLTAGE_SWING_LANE0_MASK;
+		preemphasis = ((dpcd_adjust_req[index] >> shift) &
+			       DP_ADJUST_PRE_EMPHASIS_LANE0_MASK) >>
+			      DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT;
+		val = swing << DP_TRAIN_VOLTAGE_SWING_SHIFT |
+		      preemphasis << DP_TRAIN_PRE_EMPHASIS_SHIFT;
+
+		if (swing == DP_TRAIN_VOLTAGE_SWING_LEVEL_3)
+			val |= DP_TRAIN_MAX_SWING_REACHED;
+		if (preemphasis == 3)
+			val |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
+
+		mtk_dp_set_swing_pre_emphasis(mtk_dp, lane, swing, preemphasis);
+		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_TRAINING_LANE0_SET + lane,
+				   val);
+	}
+
+	// Wait for the signal to be stable enough
+	usleep_range(2000, 5000);
+}
+
+static void mtk_dp_read_link_status(struct mtk_dp *mtk_dp,
+				    u8 link_status[DP_LINK_STATUS_SIZE])
+{
+	drm_dp_dpcd_read(&mtk_dp->aux, DP_LANE0_1_STATUS, link_status,
+			 DP_LINK_STATUS_SIZE);
+}
+
+static int mtk_dp_train_flow(struct mtk_dp *mtk_dp, int target_link_rate,
+			     int target_lane_count)
+{
+	u8 link_status[DP_LINK_STATUS_SIZE] = {};
+	u8 lane_adjust[2] = {};
+	bool pass_tps1 = false;
+	bool pass_tps2_3 = false;
+	int train_retries;
+	int status_control;
+	int iteration_count;
+	u8 prev_lane_adjust;
+	u8 val;
+
+	// TODO(scosu): This is done over and over. Choose one location
+	drm_dp_dpcd_readb(&mtk_dp->aux, DP_SET_POWER, &val);
+	if (val != DP_SET_POWER_D0) {
+		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
+		usleep_range(1000, 5000);
+	}
+
+	drm_dp_dpcd_writeb(&mtk_dp->aux, DP_LINK_BW_SET, target_link_rate);
+	drm_dp_dpcd_writeb(&mtk_dp->aux, DP_LANE_COUNT_SET,
+			   target_lane_count | DP_LANE_COUNT_ENHANCED_FRAME_EN);
+
+	if (mtk_dp->train_info.sink_ssc)
+		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_DOWNSPREAD_CTRL,
+				   DP_SPREAD_AMP_0_5);
+
+	train_retries = 0;
+	status_control = 0;
+	iteration_count = 1;
+	prev_lane_adjust = 0xFF;
+
+	mtk_dp_set_lanes(mtk_dp, target_lane_count / 2);
+	mtk_dp_phy_configure(mtk_dp, target_link_rate, target_lane_count);
+
+	do {
+		train_retries++;
+		if (!mtk_dp->train_info.cable_plugged_in ||
+		    ((mtk_dp->train_info.irq_status &
+		      MTK_DP_HPD_DISCONNECT) != 0x0)) {
+			return -ENODEV;
+		}
+
+		if (mtk_dp->train_state < MTK_DP_TRAIN_STATE_TRAINING)
+			return -EAGAIN;
+
+		if (!pass_tps1)	{
+			mtk_dp_training_set_scramble(mtk_dp, false);
+
+			if (status_control == 0) {
+				status_control = 1;
+				mtk_dp_train_set_pattern(mtk_dp, 1);
+				val = DP_LINK_SCRAMBLING_DISABLE |
+				      DP_TRAINING_PATTERN_1;
+				drm_dp_dpcd_writeb(&mtk_dp->aux,
+						   DP_TRAINING_PATTERN_SET,
+						   DP_LINK_SCRAMBLING_DISABLE |
+						   DP_TRAINING_PATTERN_1);
+				drm_dp_dpcd_read(&mtk_dp->aux,
+						 DP_ADJUST_REQUEST_LANE0_1,
+						 lane_adjust,
+						 sizeof(lane_adjust));
+				iteration_count++;
+
+				mtk_dp_train_update_swing_pre(mtk_dp,
+							      target_lane_count,
+							      lane_adjust);
+			}
+
+			drm_dp_link_train_clock_recovery_delay(&mtk_dp->aux,
+							       mtk_dp->rx_cap);
+			mtk_dp_read_link_status(mtk_dp, link_status);
+
+			if (drm_dp_clock_recovery_ok(link_status,
+						     target_lane_count)) {
+				mtk_dp->train_info.cr_done = true;
+				pass_tps1 = true;
+				train_retries = 0;
+				iteration_count = 1;
+			} else if (prev_lane_adjust == link_status[4]) {
+				iteration_count++;
+				if (prev_lane_adjust &
+				    DP_ADJUST_VOLTAGE_SWING_LANE0_MASK)
+					break;
+			} else {
+				prev_lane_adjust = link_status[4];
+			}
+		} else if (pass_tps1 && !pass_tps2_3) {
+			if (status_control == 1) {
+				status_control = 2;
+				if (mtk_dp->train_info.tps4) {
+					mtk_dp_train_set_pattern(mtk_dp, 4);
+					val = DP_TRAINING_PATTERN_4;
+				} else if (mtk_dp->train_info.tps3) {
+					mtk_dp_train_set_pattern(mtk_dp, 3);
+					val = DP_LINK_SCRAMBLING_DISABLE |
+					      DP_TRAINING_PATTERN_3;
+				} else {
+					mtk_dp_train_set_pattern(mtk_dp, 2);
+					val = DP_LINK_SCRAMBLING_DISABLE |
+					      DP_TRAINING_PATTERN_2;
+				}
+				drm_dp_dpcd_writeb(&mtk_dp->aux,
+						   DP_TRAINING_PATTERN_SET,
+						   val);
+
+				drm_dp_dpcd_read(&mtk_dp->aux,
+						 DP_ADJUST_REQUEST_LANE0_1,
+						 lane_adjust,
+						 sizeof(lane_adjust));
+
+				iteration_count++;
+				mtk_dp_train_update_swing_pre(mtk_dp,
+							      target_lane_count,
+							      lane_adjust);
+			}
+
+			drm_dp_link_train_channel_eq_delay(&mtk_dp->aux,
+							   mtk_dp->rx_cap);
+
+			mtk_dp_read_link_status(mtk_dp, link_status);
+
+			if (!drm_dp_clock_recovery_ok(link_status,
+						      target_lane_count)) {
+				mtk_dp->train_info.cr_done = false;
+				mtk_dp->train_info.eq_done = false;
+				break;
+			}
+
+			if (drm_dp_channel_eq_ok(link_status,
+						 target_lane_count)) {
+				mtk_dp->train_info.eq_done = true;
+				pass_tps2_3 = true;
+				break;
+			}
+
+			if (prev_lane_adjust == link_status[4])
+				iteration_count++;
+			else
+				prev_lane_adjust = link_status[4];
+		}
+	} while (train_retries < MTK_DP_TRAIN_RETRY_LIMIT &&
+		 iteration_count < MTK_DP_TRAIN_MAX_ITERATIONS);
+
+	drm_dp_dpcd_writeb(&mtk_dp->aux, DP_TRAINING_PATTERN_SET,
+			   DP_TRAINING_PATTERN_DISABLE);
+	mtk_dp_train_set_pattern(mtk_dp, 0);
+
+	if (pass_tps2_3) {
+		mtk_dp->train_info.link_rate = target_link_rate;
+		mtk_dp->train_info.lane_count = target_lane_count;
+
+		mtk_dp_training_set_scramble(mtk_dp, true);
+
+		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_LANE_COUNT_SET,
+				   target_lane_count |
+					   DP_LANE_COUNT_ENHANCED_FRAME_EN);
+		mtk_dp_set_enhanced_frame_mode(mtk_dp, true);
+
+		return 0;
+	}
+
+	return -ETIMEDOUT;
+}
+
+static void mtk_dp_fec_set_capabilities(struct mtk_dp *mtk_dp)
+{
+	u8 fec_capabilities;
+
+	drm_dp_dpcd_readb(&mtk_dp->aux, DP_FEC_CAPABILITY, &fec_capabilities);
+
+	mtk_dp->has_fec = !!(fec_capabilities & DP_FEC_CAPABLE);
+	if (!mtk_dp->has_fec)
+		return;
+
+	drm_dp_dpcd_writeb(&mtk_dp->aux, DP_FEC_CONFIGURATION,
+			   DP_FEC_BIT_ERROR_COUNT | DP_FEC_READY);
+}
+
+static bool mtk_dp_parse_capabilities(struct mtk_dp *mtk_dp)
+{
+	u8 buf[DP_RECEIVER_CAP_SIZE] = {};
+	u8 val;
+	struct mtk_dp_train_info *train_info = &mtk_dp->train_info;
+
+	if (!mtk_dp_plug_state(mtk_dp))
+		return false;
+
+	drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
+	usleep_range(2000, 5000);
+
+	drm_dp_dpcd_read(&mtk_dp->aux, DP_DPCD_REV, buf, sizeof(buf));
+
+	memcpy(mtk_dp->rx_cap, buf, min(sizeof(mtk_dp->rx_cap), sizeof(buf)));
+	mtk_dp->rx_cap[DP_TRAINING_AUX_RD_INTERVAL] &= DP_TRAINING_AUX_RD_MASK;
+
+	if (buf[DP_DPCD_REV] >= DP_DPCD_REV_14)
+		mtk_dp_fec_set_capabilities(mtk_dp);
+
+	// TODO(scosu): duplicated with training start
+	train_info->link_rate =
+		min_t(int, MTK_DP_MAX_LINK_RATE, buf[DP_MAX_LINK_RATE]);
+	train_info->lane_count =
+		min_t(int, MTK_DP_MAX_LANES, drm_dp_max_lane_count(buf));
+
+	train_info->tps3 = drm_dp_tps3_supported(buf);
+	train_info->tps4 = drm_dp_tps4_supported(buf);
+
+	train_info->sink_ssc =
+		!!(buf[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5);
+
+	drm_dp_dpcd_readb(&mtk_dp->aux, DP_MSTM_CAP, &val);
+	if (val & DP_MST_CAP) {
+		// Clear DP_DEVICE_SERVICE_IRQ_VECTOR_ESI0
+		drm_dp_dpcd_readb(&mtk_dp->aux,
+				  DP_DEVICE_SERVICE_IRQ_VECTOR_ESI0, &val);
+		if (val)
+			drm_dp_dpcd_writeb(&mtk_dp->aux,
+					   DP_DEVICE_SERVICE_IRQ_VECTOR_ESI0,
+					   val);
+	}
+
+	return true;
+}
+
+static int mtk_dp_edid_parse_audio_capabilities(struct mtk_dp *mtk_dp,
+						struct mtk_dp_audio_cfg *cfg)
+{
+	struct cea_sad *sads;
+	int sad_count;
+	int i;
+	int ret = 0;
+
+	mutex_lock(&mtk_dp->edid_lock);
+	if (!mtk_dp->edid) {
+		mutex_unlock(&mtk_dp->edid_lock);
+		dev_err(mtk_dp->dev, "EDID not found!\n");
+		return -EINVAL;
+	}
+
+	sad_count = drm_edid_to_sad(mtk_dp->edid, &sads);
+	mutex_unlock(&mtk_dp->edid_lock);
+	if (sad_count <= 0) {
+		drm_info(mtk_dp->drm_dev, "The SADs is NULL\n");
+		return 0;
+	}
+
+	for (i = 0; i < sad_count; i++) {
+		int sample_rate;
+		int word_length;
+		// Only PCM supported at the moment
+		if (sads[i].format != HDMI_AUDIO_CODING_TYPE_PCM)
+			continue;
+
+		sample_rate = drm_cea_sad_get_sample_rate(&sads[i]);
+		word_length =
+			drm_cea_sad_get_uncompressed_word_length(&sads[i]);
+		if (sample_rate <= 0 || word_length <= 0)
+			continue;
+
+		cfg->channels = sads[i].channels;
+		cfg->word_length_bits = word_length;
+		cfg->sample_rate = sample_rate;
+		ret = 1;
+		break;
+	}
+	kfree(sads);
+
+	return ret;
+}
+
+static void mtk_dp_train_change_mode(struct mtk_dp *mtk_dp)
+{
+	phy_reset(mtk_dp->phy);
+	mtk_dp_reset_swing_pre_emphasis(mtk_dp);
+
+	usleep_range(2000, 5000);
+}
+
+static int mtk_dp_train_start(struct mtk_dp *mtk_dp)
+{
+	int ret = 0;
+	int lane_count;
+	int link_rate;
+	int train_limit;
+	int max_link_rate;
+	int plug_wait;
+
+	for (plug_wait = 7; !mtk_dp_plug_state(mtk_dp) && plug_wait > 0;
+	     --plug_wait)
+		usleep_range(1000, 5000);
+	if (plug_wait == 0) {
+		mtk_dp->train_state = MTK_DP_TRAIN_STATE_DPIDLE;
+		return -ENODEV;
+	}
+
+	drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
+
+	// TODO(scosu): maybe call mtk_dp_parse_capabilities before to do this
+	// stuff?
+	link_rate = mtk_dp->rx_cap[1];
+	lane_count = mtk_dp->rx_cap[2] & 0x1F;
+
+	mtk_dp->train_info.link_rate = min(MTK_DP_MAX_LINK_RATE, link_rate);
+	mtk_dp->train_info.lane_count =
+		min(MTK_DP_MAX_LANES, lane_count);
+	link_rate = mtk_dp->train_info.link_rate;
+	lane_count = mtk_dp->train_info.lane_count;
+
+	switch (link_rate) {
+	case MTK_DP_LINKRATE_RBR:
+	case MTK_DP_LINKRATE_HBR:
+	case MTK_DP_LINKRATE_HBR2:
+	case MTK_DP_LINKRATE_HBR25:
+	case MTK_DP_LINKRATE_HBR3:
+		break;
+	default:
+		mtk_dp->train_info.link_rate = MTK_DP_LINKRATE_HBR3;
+		break;
+	};
+
+	max_link_rate = link_rate;
+	for (train_limit = 0; train_limit <= 6; ++train_limit) {
+		mtk_dp->train_info.cr_done = false;
+		mtk_dp->train_info.eq_done = false;
+
+		mtk_dp_train_change_mode(mtk_dp);
+		ret = mtk_dp_train_flow(mtk_dp, link_rate, lane_count);
+		if (ret == -ENODEV || ret == -EAGAIN)
+			return ret;
+
+		if (!mtk_dp->train_info.cr_done) {
+			switch (link_rate) {
+			case MTK_DP_LINKRATE_RBR:
+				lane_count = lane_count / 2;
+				link_rate = max_link_rate;
+				if (lane_count == 0x0) {
+					mtk_dp->train_state =
+						MTK_DP_TRAIN_STATE_DPIDLE;
+					return -EIO;
+				}
+				break;
+			case MTK_DP_LINKRATE_HBR:
+				link_rate = MTK_DP_LINKRATE_RBR;
+				break;
+			case MTK_DP_LINKRATE_HBR2:
+				link_rate = MTK_DP_LINKRATE_HBR;
+				break;
+			case MTK_DP_LINKRATE_HBR3:
+				link_rate = MTK_DP_LINKRATE_HBR2;
+				break;
+			default:
+				return -EINVAL;
+			};
+		} else if (!mtk_dp->train_info.eq_done) {
+			lane_count /= 2;
+			if (lane_count == 0)
+				return -EIO;
+		} else {
+			return 0;
+		}
+	}
+
+	return -ETIMEDOUT;
+}
+
+static int mtk_dp_train_handler(struct mtk_dp *mtk_dp)
+{
+	int ret = 0;
+
+	ret = mtk_dp_train_hpd_handle(mtk_dp);
+
+	if (!mtk_dp->train_info.cable_plugged_in)
+		return -ENODEV;
+
+	if (mtk_dp->train_state == MTK_DP_TRAIN_STATE_NORMAL)
+		return ret;
+
+	switch (mtk_dp->train_state) {
+	case MTK_DP_TRAIN_STATE_STARTUP:
+		mtk_dp->train_state = MTK_DP_TRAIN_STATE_CHECKCAP;
+		break;
+
+	case MTK_DP_TRAIN_STATE_CHECKCAP:
+		if (mtk_dp_parse_capabilities(mtk_dp)) {
+			mtk_dp->train_info.check_cap_count = 0;
+			mtk_dp->train_state = MTK_DP_TRAIN_STATE_CHECKEDID;
+		} else {
+			mtk_dp->train_info.check_cap_count++;
+
+			if (mtk_dp->train_info.check_cap_count >
+			    MTK_DP_CHECK_SINK_CAP_TIMEOUT_COUNT) {
+				mtk_dp->train_info.check_cap_count = 0;
+				mtk_dp->train_state = MTK_DP_TRAIN_STATE_DPIDLE;
+				ret = -ETIMEDOUT;
+			}
+		}
+		break;
+
+	case MTK_DP_TRAIN_STATE_CHECKEDID:
+		{
+			int caps_found =
+				mtk_dp_edid_parse_audio_capabilities(mtk_dp,
+								     &mtk_dp->info.audio_caps);
+			mtk_dp->audio_enable = caps_found > 0;
+			if (!mtk_dp->audio_enable)
+				memset(&mtk_dp->info.audio_caps, 0,
+				       sizeof(mtk_dp->info.audio_caps));
+		}
+
+		mtk_dp->train_state = MTK_DP_TRAIN_STATE_TRAINING_PRE;
+		break;
+
+	case MTK_DP_TRAIN_STATE_TRAINING_PRE:
+		mtk_dp->train_state = MTK_DP_TRAIN_STATE_TRAINING;
+		break;
+
+	case MTK_DP_TRAIN_STATE_TRAINING:
+		ret = mtk_dp_train_start(mtk_dp);
+		if (!ret) {
+			mtk_dp_video_mute(mtk_dp, true);
+			mtk_dp_audio_mute(mtk_dp, true);
+			mtk_dp->train_state = MTK_DP_TRAIN_STATE_CHECKTIMING;
+			mtk_dp_fec_enable(mtk_dp, mtk_dp->has_fec);
+		} else if (ret != -EAGAIN) {
+			mtk_dp->train_state = MTK_DP_TRAIN_STATE_DPIDLE;
+		}
+
+		ret = 0;
+		break;
+
+	case MTK_DP_TRAIN_STATE_CHECKTIMING:
+		mtk_dp->train_state = MTK_DP_TRAIN_STATE_NORMAL;
+		break;
+	case MTK_DP_TRAIN_STATE_NORMAL:
+		break;
+	case MTK_DP_TRAIN_STATE_POWERSAVE:
+		break;
+	case MTK_DP_TRAIN_STATE_DPIDLE:
+		break;
+	default:
+		break;
+	}
+
+	return ret;
+}
+
+static void mtk_dp_video_enable(struct mtk_dp *mtk_dp, bool enable)
+{
+	if (enable) {
+		mtk_dp_set_tx_out(mtk_dp);
+		mtk_dp_video_mute(mtk_dp, false);
+	} else {
+		mtk_dp_video_mute(mtk_dp, true);
+	}
+}
+
+static void mtk_dp_audio_sdp_setup(struct mtk_dp *mtk_dp,
+				   struct mtk_dp_audio_cfg *cfg)
+{
+	struct mtk_dp_sdp_packet packet;
+	struct hdmi_audio_infoframe frame;
+
+	hdmi_audio_infoframe_init(&frame);
+	frame.coding_type = HDMI_AUDIO_CODING_TYPE_PCM;
+	frame.channels = cfg->channels;
+	frame.sample_frequency = cfg->sample_rate;
+
+	switch (cfg->word_length_bits) {
+	case 16:
+		frame.sample_size = HDMI_AUDIO_SAMPLE_SIZE_16;
+		break;
+	case 20:
+		frame.sample_size = HDMI_AUDIO_SAMPLE_SIZE_20;
+		break;
+	case 24:
+	default:
+		frame.sample_size = HDMI_AUDIO_SAMPLE_SIZE_24;
+		break;
+	}
+
+	packet.type = MTK_DP_SDP_AUI;
+	hdmi_audio_infoframe_pack_for_dp(&frame, &packet.sdp,
+					 MTK_DP_DP_VERSION_11);
+
+	mtk_dp_audio_sdp_asp_set_channels(mtk_dp, cfg->channels);
+	mtk_dp_setup_sdp(mtk_dp, &packet);
+}
+
+static void mtk_dp_audio_setup(struct mtk_dp *mtk_dp,
+			       struct mtk_dp_audio_cfg *cfg)
+{
+	mtk_dp_audio_sdp_setup(mtk_dp, cfg);
+	mtk_dp_audio_channel_status_set(mtk_dp, cfg);
+
+	mtk_dp_audio_setup_channels(mtk_dp, cfg);
+	// TODO(scosu): setting divider hardcoded to 5 is probably wrong
+	mtk_dp_audio_set_divider(mtk_dp, 5);
+}
+
+static void mtk_dp_video_config(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_mn_overwrite_disable(mtk_dp);
+
+	mtk_dp_set_msa(mtk_dp);
+
+	mtk_dp_set_color_depth(mtk_dp, mtk_dp->info.depth);
+	mtk_dp_set_color_format(mtk_dp, mtk_dp->info.format);
+}
+
+static int mtk_dp_state_handler(struct mtk_dp *mtk_dp)
+{
+	int ret = 0;
+
+	if (!mtk_dp->train_info.cable_plugged_in)
+		return -ENODEV;
+
+	switch (mtk_dp->state) {
+	case MTK_DP_STATE_INITIAL:
+		mtk_dp_video_mute(mtk_dp, true);
+		mtk_dp_audio_mute(mtk_dp, true);
+		mtk_dp->state = MTK_DP_STATE_IDLE;
+		break;
+
+	case MTK_DP_STATE_IDLE:
+		if (mtk_dp->train_state == MTK_DP_TRAIN_STATE_NORMAL)
+			mtk_dp->state = MTK_DP_STATE_PREPARE;
+		break;
+
+	case MTK_DP_STATE_PREPARE:
+		mtk_dp_video_config(mtk_dp);
+		mtk_dp_video_enable(mtk_dp, true);
+
+		if (mtk_dp->audio_enable) {
+			mtk_dp_audio_setup(mtk_dp, &mtk_dp->info.audio_caps);
+			mtk_dp_audio_mute(mtk_dp, false);
+		}
+
+		mtk_dp->state = MTK_DP_STATE_NORMAL;
+		break;
+
+	case MTK_DP_STATE_NORMAL:
+		if (mtk_dp->train_state != MTK_DP_TRAIN_STATE_NORMAL) {
+			mtk_dp_video_mute(mtk_dp, true);
+			mtk_dp_audio_mute(mtk_dp, true);
+			mtk_dp_sdp_stop_sending(mtk_dp);
+			mtk_dp->state = MTK_DP_STATE_IDLE;
+		}
+		break;
+
+	default:
+		break;
+	}
+
+	return ret;
+}
+
+static void mtk_dp_init_port(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_set_idle_pattern(mtk_dp, true);
+	mtk_dp_initialize_priv_data(mtk_dp);
+
+	mtk_dp_initialize_settings(mtk_dp);
+	mtk_dp_initialize_aux_settings(mtk_dp);
+	mtk_dp_initialize_digital_settings(mtk_dp);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_3690,
+			   BIT(RX_REPLY_COMPLETE_MODE_AUX_TX_P0_SHIFT),
+			   RX_REPLY_COMPLETE_MODE_AUX_TX_P0_MASK);
+	mtk_dp_initialize_hpd_detect_settings(mtk_dp);
+
+	mtk_dp_digital_sw_reset(mtk_dp);
+}
+
+static irqreturn_t mtk_dp_hpd_event_thread(int hpd, void *dev)
+{
+	struct mtk_dp *mtk_dp = dev;
+	int event;
+
+	event = mtk_dp_plug_state(mtk_dp) ? connector_status_connected :
+		connector_status_disconnected;
+
+	if (event < 0)
+		return IRQ_HANDLED;
+
+	if (mtk_dp->drm_dev)
+		drm_helper_hpd_irq_event(mtk_dp->bridge.dev);
+
+	if (mtk_dp->train_info.irq_status & MTK_DP_HPD_INTERRUPT) {
+		dev_info(mtk_dp->dev, "MTK_DP_HPD_INTERRUPT\n");
+		mtk_dp->train_info.irq_status &= ~MTK_DP_HPD_INTERRUPT;
+		mtk_dp_hpd_sink_event(mtk_dp);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t mtk_dp_hpd_isr_handler(struct mtk_dp *mtk_dp)
+{
+	bool connected;
+	u16 swirq_status = mtk_dp_swirq_get_clear(mtk_dp);
+	u8 hwirq_status =  mtk_dp_hwirq_get_clear(mtk_dp);
+	struct mtk_dp_train_info *train_info = &mtk_dp->train_info;
+
+	train_info->irq_status |= hwirq_status | swirq_status;
+
+	if (!train_info->irq_status)
+		return IRQ_HANDLED;
+
+	connected = mtk_dp_plug_state(mtk_dp);
+	if (connected || !train_info->cable_plugged_in)
+		train_info->irq_status &= ~MTK_DP_HPD_DISCONNECT;
+	else if (!connected || train_info->cable_plugged_in)
+		train_info->irq_status &= ~MTK_DP_HPD_CONNECT;
+
+	if (!(train_info->irq_status &
+	      (MTK_DP_HPD_CONNECT | MTK_DP_HPD_DISCONNECT)))
+		return IRQ_HANDLED;
+
+	if (train_info->irq_status & MTK_DP_HPD_CONNECT) {
+		train_info->irq_status &= ~MTK_DP_HPD_CONNECT;
+		train_info->cable_plugged_in = true;
+	} else {
+		train_info->irq_status &= ~MTK_DP_HPD_DISCONNECT;
+		train_info->cable_plugged_in = false;
+		mtk_dp->train_state = MTK_DP_TRAIN_STATE_STARTUP;
+	}
+	train_info->cable_state_change = true;
+	return IRQ_WAKE_THREAD;
+}
+
+static irqreturn_t mtk_dp_hpd_event(int hpd, void *dev)
+{
+	struct mtk_dp *mtk_dp = dev;
+	u32 irq_status;
+
+	irq_status = mtk_dp_read(mtk_dp, MTK_DP_TOP_IRQ_STATUS);
+
+	if (!irq_status)
+		return IRQ_HANDLED;
+
+	if (irq_status & RGS_IRQ_STATUS_TRANSMITTER)
+		return mtk_dp_hpd_isr_handler(mtk_dp);
+
+	return IRQ_HANDLED;
+}
+
+static int mtk_dp_dt_parse_pdata(struct mtk_dp *mtk_dp,
+				 struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	int ret = 0;
+	void __iomem *base;
+
+	base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	mtk_dp->regs = devm_regmap_init_mmio(dev, base, &mtk_dp_regmap_config);
+	if (IS_ERR(mtk_dp->regs))
+		return PTR_ERR(mtk_dp->regs);
+
+	mtk_dp->dp_tx_clk = devm_clk_get(dev, "faxi");
+	if (IS_ERR(mtk_dp->dp_tx_clk)) {
+		ret = PTR_ERR(mtk_dp->dp_tx_clk);
+		dev_err(dev, "Failed to get dptx clock: %d\n", ret);
+		mtk_dp->dp_tx_clk = NULL;
+	}
+
+	return 0;
+}
+
+static void mtk_dp_update_plugged_status(struct mtk_dp *mtk_dp)
+{
+	bool connected;
+
+	mutex_lock(&mtk_dp->update_plugged_status_lock);
+	connected = mtk_dp_plug_state(mtk_dp);
+	if (mtk_dp->plugged_cb && mtk_dp->codec_dev)
+		mtk_dp->plugged_cb(mtk_dp->codec_dev, connected);
+	mutex_unlock(&mtk_dp->update_plugged_status_lock);
+}
+
+static enum drm_connector_status mtk_dp_bdg_detect(struct drm_bridge *bridge)
+{
+	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
+	enum drm_connector_status ret;
+
+	ret = mtk_dp_plug_state(mtk_dp) ? connector_status_connected :
+			connector_status_disconnected;
+
+	if (mtk_dp->driver_data->is_edp)
+		return connector_status_connected;
+
+	mtk_dp_update_plugged_status(mtk_dp);
+	return ret;
+}
+
+static struct edid *mtk_dp_get_edid(struct drm_bridge *bridge,
+				    struct drm_connector *connector)
+{
+	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
+	bool enabled = mtk_dp->enabled;
+	struct edid *new_edid = NULL;
+
+	if (!enabled)
+		drm_bridge_chain_pre_enable(bridge);
+
+	if (mtk_dp_plug_state(mtk_dp))
+		new_edid = drm_get_edid(connector, &mtk_dp->aux.ddc);
+
+	if (!enabled)
+		drm_bridge_chain_post_disable(bridge);
+
+	mutex_lock(&mtk_dp->edid_lock);
+	kfree(mtk_dp->edid);
+	if (!new_edid)
+		return NULL;
+
+	mtk_dp->edid = drm_edid_duplicate(new_edid);
+	mutex_unlock(&mtk_dp->edid_lock);
+
+	return new_edid;
+}
+
+static ssize_t mtk_dp_aux_transfer(struct drm_dp_aux *mtk_aux,
+				   struct drm_dp_aux_msg *msg)
+{
+	ssize_t err = -EAGAIN;
+	struct mtk_dp *mtk_dp;
+	bool is_read;
+	u8 request;
+	size_t accessed_bytes = 0;
+	int ret = 0;
+
+	mtk_dp = container_of(mtk_aux, struct mtk_dp, aux);
+
+	if (!mtk_dp->train_info.cable_plugged_in ||
+	    mtk_dp->train_info.irq_status & MTK_DP_HPD_DISCONNECT) {
+		mtk_dp->train_state = MTK_DP_TRAIN_STATE_CHECKCAP;
+		err = -EAGAIN;
+		goto err;
+	}
+
+	switch (msg->request) {
+	case DP_AUX_I2C_MOT:
+	case DP_AUX_I2C_WRITE:
+	case DP_AUX_NATIVE_WRITE:
+	case DP_AUX_I2C_WRITE_STATUS_UPDATE:
+	case DP_AUX_I2C_WRITE_STATUS_UPDATE | DP_AUX_I2C_MOT:
+		request = msg->request & ~DP_AUX_I2C_WRITE_STATUS_UPDATE;
+		is_read = false;
+		break;
+	case DP_AUX_I2C_READ:
+	case DP_AUX_NATIVE_READ:
+	case DP_AUX_I2C_READ | DP_AUX_I2C_MOT:
+		request = msg->request;
+		is_read = true;
+		break;
+	default:
+		drm_err(mtk_aux->drm_dev, "invalid aux cmd = %d\n",
+			msg->request);
+		err = -EINVAL;
+		goto err;
+	}
+
+	while (accessed_bytes < msg->size) {
+		size_t to_access = min_t(size_t, DP_AUX_MAX_PAYLOAD_BYTES,
+				       msg->size - accessed_bytes);
+
+		ret = mtk_dp_aux_do_transfer(mtk_dp, is_read, request,
+					     msg->address + accessed_bytes,
+					     msg->buffer + accessed_bytes,
+					     to_access);
+		accessed_bytes += to_access;
+		if (ret) {
+			drm_info(mtk_dp->drm_dev,
+				 "Failed to do AUX transfer: %d\n", ret);
+			break;
+		}
+	}
+
+err:
+	if (!ret) {
+		msg->reply = DP_AUX_NATIVE_REPLY_ACK | DP_AUX_I2C_REPLY_ACK;
+		ret = msg->size;
+	} else {
+		msg->reply = DP_AUX_NATIVE_REPLY_NACK | DP_AUX_I2C_REPLY_NACK;
+		return err;
+	}
+
+	msg->reply = DP_AUX_NATIVE_REPLY_ACK | DP_AUX_I2C_REPLY_ACK;
+	return msg->size;
+}
+
+static void mtk_dp_aux_init(struct mtk_dp *mtk_dp)
+{
+	// TODO(scosu): maybe needs a call to drm_dp_aux_register?
+	drm_dp_aux_init(&mtk_dp->aux);
+	mtk_dp->aux.name = "aux_mtk_dp";
+	mtk_dp->aux.transfer = mtk_dp_aux_transfer;
+}
+
+static void mtk_dp_poweroff(struct mtk_dp *mtk_dp)
+{
+	mutex_lock(&mtk_dp->dp_lock);
+
+	mtk_dp_hwirq_enable(mtk_dp, false);
+	mtk_dp_power_disable(mtk_dp);
+	phy_exit(mtk_dp->phy);
+	clk_disable_unprepare(mtk_dp->dp_tx_clk);
+
+	mutex_unlock(&mtk_dp->dp_lock);
+}
+
+static int mtk_dp_poweron(struct mtk_dp *mtk_dp)
+{
+	int ret = 0;
+
+	mutex_lock(&mtk_dp->dp_lock);
+
+	ret = clk_prepare_enable(mtk_dp->dp_tx_clk);
+	if (ret < 0) {
+		dev_err(mtk_dp->dev, "Fail to enable clock: %d\n", ret);
+		goto err;
+	}
+	ret = phy_init(mtk_dp->phy);
+	if (ret) {
+		dev_err(mtk_dp->dev, "Failed to initialize phy: %d\n", ret);
+		goto err_phy_init;
+	}
+
+	ret = mtk_dp_phy_configure(mtk_dp, MTK_DP_LINKRATE_RBR, 1);
+	if (ret) {
+		dev_err(mtk_dp->dev, "Failed to configure phy: %d\n", ret);
+		goto err_phy_config;
+	}
+
+	mtk_dp_init_port(mtk_dp);
+	mtk_dp_power_enable(mtk_dp);
+	mtk_dp_hwirq_enable(mtk_dp, true);
+
+err_phy_config:
+	phy_exit(mtk_dp->phy);
+err_phy_init:
+	clk_disable_unprepare(mtk_dp->dp_tx_clk);
+err:
+	mutex_unlock(&mtk_dp->dp_lock);
+	return ret;
+}
+
+static int mtk_dp_bridge_attach(struct drm_bridge *bridge,
+				enum drm_bridge_attach_flags flags)
+{
+	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
+	int ret;
+
+	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
+		dev_err(mtk_dp->dev, "Driver does not provide a connector!");
+		return -EINVAL;
+	}
+
+	ret = mtk_dp_poweron(mtk_dp);
+	if (ret)
+		return ret;
+
+	if (mtk_dp->next_bridge) {
+		ret = drm_bridge_attach(bridge->encoder, mtk_dp->next_bridge,
+					&mtk_dp->bridge, flags);
+		if (ret) {
+			drm_warn(mtk_dp->drm_dev,
+				 "Failed to attach external bridge: %d\n", ret);
+			goto err_bridge_attach;
+		}
+	}
+
+	mtk_dp->drm_dev = bridge->dev;
+
+	return 0;
+
+err_bridge_attach:
+	mtk_dp_poweroff(mtk_dp);
+	return ret;
+}
+
+static void mtk_dp_bridge_detach(struct drm_bridge *bridge)
+{
+	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
+
+	mtk_dp->drm_dev = NULL;
+
+	mtk_dp_poweroff(mtk_dp);
+}
+
+static void mtk_dp_bridge_atomic_disable(struct drm_bridge *bridge,
+					 struct drm_bridge_state *old_state)
+{
+	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
+
+	mtk_dp->enabled = false;
+}
+
+static void mtk_dp_parse_drm_mode_timings(struct mtk_dp *mtk_dp,
+					  struct drm_display_mode *mode)
+{
+	struct mtk_dp_timings *timings = &mtk_dp->info.timings;
+
+	drm_display_mode_to_videomode(mode, &timings->vm);
+	timings->frame_rate = mode->clock * 1000 / mode->htotal / mode->vtotal;
+	timings->htotal = mode->htotal;
+	timings->vtotal = mode->vtotal;
+}
+
+static void mtk_dp_bridge_atomic_enable(struct drm_bridge *bridge,
+					struct drm_bridge_state *old_state)
+{
+	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
+	struct drm_connector *conn;
+	struct drm_connector_state *conn_state;
+	struct drm_crtc *crtc;
+	struct drm_crtc_state *crtc_state;
+	int ret = 0;
+	int i;
+
+	conn = drm_atomic_get_new_connector_for_encoder(old_state->base.state,
+							bridge->encoder);
+	if (!conn) {
+		drm_err(mtk_dp->drm_dev,
+			"Can't enable bridge as connector is missing\n");
+		return;
+	}
+
+	memcpy(mtk_dp->connector_eld, conn->eld, MAX_ELD_BYTES);
+
+	conn_state =
+		drm_atomic_get_new_connector_state(old_state->base.state, conn);
+	if (!conn_state) {
+		drm_err(mtk_dp->drm_dev,
+			"Can't enable bridge as connector state is missing\n");
+		return;
+	}
+
+	crtc = conn_state->crtc;
+	if (!crtc) {
+		drm_err(mtk_dp->drm_dev,
+			"Can't enable bridge as connector state doesn't have a crtc\n");
+		return;
+	}
+	crtc_state = drm_atomic_get_new_crtc_state(old_state->base.state, crtc);
+	if (!crtc_state) {
+		drm_err(mtk_dp->drm_dev,
+			"Can't enable bridge as crtc state is missing\n");
+		return;
+	}
+
+	mtk_dp_parse_drm_mode_timings(mtk_dp, &crtc_state->adjusted_mode);
+
+	// TODO(scosu): ignores return value
+	mtk_dp_parse_capabilities(mtk_dp);
+	//training
+	for (i = 0; i < 50; i++) {
+		ret = mtk_dp_train_handler(mtk_dp);
+		if (ret) {
+			drm_err(mtk_dp->drm_dev, "Train handler failed %d\n",
+				ret);
+			return;
+		}
+
+		ret = mtk_dp_state_handler(mtk_dp);
+		if (ret) {
+			drm_err(mtk_dp->drm_dev, "State handler failed %d\n",
+				ret);
+			return;
+		}
+	}
+
+	mtk_dp->enabled = true;
+}
+
+static const struct drm_bridge_funcs mtk_dp_bridge_funcs = {
+	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
+	.atomic_reset = drm_atomic_helper_bridge_reset,
+	.attach = mtk_dp_bridge_attach,
+	.detach = mtk_dp_bridge_detach,
+	.atomic_enable = mtk_dp_bridge_atomic_enable,
+	.atomic_disable = mtk_dp_bridge_atomic_disable,
+	.get_edid = mtk_dp_get_edid,
+	.detect = mtk_dp_bdg_detect,
+};
+
+/*
+ * HDMI audio codec callbacks
+ */
+static int mtk_dp_audio_hw_params(struct device *dev, void *data,
+				  struct hdmi_codec_daifmt *daifmt,
+				  struct hdmi_codec_params *params)
+{
+	struct mtk_dp *mtk_dp = dev_get_drvdata(dev);
+	struct mtk_dp_audio_cfg cfg;
+
+	if (!mtk_dp->enabled) {
+		pr_err("%s, DP is not ready!\n", __func__);
+		return -ENODEV;
+	}
+
+	cfg.channels = params->cea.channels;
+	cfg.sample_rate = params->sample_rate;
+	// TODO(scosu): Should this be 24 hardcoded?
+	cfg.word_length_bits = 24;
+
+	mtk_dp_audio_setup(mtk_dp, &cfg);
+
+	return 0;
+}
+
+static int mtk_dp_audio_startup(struct device *dev, void *data)
+{
+	struct mtk_dp *mtk_dp = dev_get_drvdata(dev);
+
+	mtk_dp_audio_mute(mtk_dp, false);
+
+	return 0;
+}
+
+static void mtk_dp_audio_shutdown(struct device *dev, void *data)
+{
+	struct mtk_dp *mtk_dp = dev_get_drvdata(dev);
+
+	mtk_dp_audio_mute(mtk_dp, true);
+}
+
+static int mtk_dp_audio_get_eld(struct device *dev, void *data, uint8_t *buf,
+				size_t len)
+{
+	struct mtk_dp *mtk_dp = dev_get_drvdata(dev);
+
+	if (mtk_dp->enabled)
+		memcpy(buf, mtk_dp->connector_eld, len);
+	else
+		memset(buf, 0, len);
+
+	return 0;
+}
+
+static int mtk_dp_audio_hook_plugged_cb(struct device *dev, void *data,
+					hdmi_codec_plugged_cb fn,
+					struct device *codec_dev)
+{
+	struct mtk_dp *mtk_dp = data;
+
+	mutex_lock(&mtk_dp->update_plugged_status_lock);
+	mtk_dp->plugged_cb = fn;
+	mtk_dp->codec_dev = codec_dev;
+	mutex_unlock(&mtk_dp->update_plugged_status_lock);
+
+	mtk_dp_update_plugged_status(mtk_dp);
+
+	return 0;
+}
+
+static const struct hdmi_codec_ops mtk_dp_audio_codec_ops = {
+	.hw_params = mtk_dp_audio_hw_params,
+	.audio_startup = mtk_dp_audio_startup,
+	.audio_shutdown = mtk_dp_audio_shutdown,
+	.get_eld = mtk_dp_audio_get_eld,
+	.hook_plugged_cb = mtk_dp_audio_hook_plugged_cb,
+	.no_capture_mute = 1,
+};
+
+static int mtk_dp_register_audio_driver(struct device *dev)
+{
+	struct mtk_dp *mtk_dp = dev_get_drvdata(dev);
+	struct hdmi_codec_pdata codec_data = {
+		.ops = &mtk_dp_audio_codec_ops,
+		.max_i2s_channels = 8,
+		.i2s = 1,
+		.data = mtk_dp,
+	};
+	struct platform_device *pdev;
+
+	pdev = platform_device_register_data(dev, HDMI_CODEC_DRV_NAME,
+					     PLATFORM_DEVID_AUTO, &codec_data,
+					     sizeof(codec_data));
+	if (IS_ERR(pdev))
+		return PTR_ERR(pdev);
+
+	return 0;
+}
+
+static int mtk_dp_probe(struct platform_device *pdev)
+{
+	struct mtk_dp *mtk_dp;
+	struct device *dev = &pdev->dev;
+	int ret;
+	int irq_num = 0;
+	struct drm_panel *panel;
+
+	mtk_dp = devm_kzalloc(dev, sizeof(*mtk_dp), GFP_KERNEL);
+	if (!mtk_dp)
+		return -ENOMEM;
+
+	mtk_dp->dev = dev;
+
+	irq_num = platform_get_irq(pdev, 0);
+	if (irq_num < 0) {
+		dev_err(dev, "failed to request dp irq resource\n");
+		return -EPROBE_DEFER;
+	}
+
+	mtk_dp->driver_data = of_device_get_match_data(dev);
+	if (!mtk_dp->driver_data)
+		return -EINVAL;
+
+	if (mtk_dp->driver_data->is_edp) {
+		ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0,
+						  &panel, &mtk_dp->next_bridge);
+		if (ret) {
+			dev_err(dev, "Failed to find panel or bridge: %d\n",
+				ret);
+			return -EPROBE_DEFER;
+		}
+
+		if (panel) {
+			mtk_dp->next_bridge =
+				devm_drm_panel_bridge_add(dev, panel);
+			if (IS_ERR(mtk_dp->next_bridge)) {
+				ret = PTR_ERR(mtk_dp->next_bridge);
+				dev_err(dev, "Failed to create bridge: %d\n",
+					ret);
+				return -EPROBE_DEFER;
+			}
+		}
+	}
+
+	ret = mtk_dp_dt_parse_pdata(mtk_dp, pdev);
+	if (ret)
+		return ret;
+
+	mtk_dp_aux_init(mtk_dp);
+
+	ret = devm_request_threaded_irq(dev, irq_num, mtk_dp_hpd_event,
+					mtk_dp_hpd_event_thread,
+					IRQ_TYPE_LEVEL_HIGH,
+					dev_name(dev), mtk_dp);
+	if (ret) {
+		dev_err(dev, "failed to request mediatek dptx irq\n");
+		return -EPROBE_DEFER;
+	}
+
+	mutex_init(&mtk_dp->dp_lock);
+
+	platform_set_drvdata(pdev, mtk_dp);
+
+	if (!mtk_dp->driver_data->is_edp) {
+		mutex_init(&mtk_dp->update_plugged_status_lock);
+		ret = mtk_dp_register_audio_driver(dev);
+		if (ret) {
+			dev_err(dev, "Failed to register audio driver: %d\n",
+				ret);
+			return ret;
+		}
+	}
+
+	mtk_dp->phy_dev = platform_device_register_data(dev, "mediatek-dp-phy",
+							PLATFORM_DEVID_AUTO,
+							&mtk_dp->regs,
+							sizeof(&mtk_dp->regs));
+	if (IS_ERR(mtk_dp->phy_dev)) {
+		dev_err(dev, "Failed to create device mediatek-dp-phy: %ld\n",
+			PTR_ERR(mtk_dp->phy_dev));
+		return PTR_ERR(mtk_dp->phy_dev);
+	}
+
+	mtk_dp->phy = dev_get_drvdata(&mtk_dp->phy_dev->dev);
+	if (IS_ERR(mtk_dp->phy)) {
+		dev_err(dev, "Failed to get phy: %ld\n", PTR_ERR(mtk_dp->phy));
+		platform_device_unregister(mtk_dp->phy_dev);
+		return PTR_ERR(mtk_dp->phy);
+	}
+
+	mtk_dp->bridge.funcs = &mtk_dp_bridge_funcs;
+	mtk_dp->bridge.of_node = dev->of_node;
+	if (mtk_dp->driver_data->is_edp)
+		mtk_dp->bridge.type = DRM_MODE_CONNECTOR_eDP;
+	else
+		mtk_dp->bridge.type = DRM_MODE_CONNECTOR_DisplayPort;
+
+	mtk_dp->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID |
+			     DRM_BRIDGE_OP_HPD;
+	drm_bridge_add(&mtk_dp->bridge);
+
+	pm_runtime_enable(dev);
+	pm_runtime_get_sync(dev);
+
+	return 0;
+}
+
+static int mtk_dp_remove(struct platform_device *pdev)
+{
+	struct mtk_dp *mtk_dp = platform_get_drvdata(pdev);
+
+	platform_device_unregister(mtk_dp->phy_dev);
+
+	mtk_dp_video_mute(mtk_dp, true);
+	mtk_dp_audio_mute(mtk_dp, true);
+
+	pm_runtime_disable(&pdev->dev);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int mtk_dp_suspend(struct device *dev)
+{
+	struct mtk_dp *mtk_dp = dev_get_drvdata(dev);
+
+	mtk_dp_power_disable(mtk_dp);
+	mtk_dp_hwirq_enable(mtk_dp, false);
+
+	pm_runtime_put_sync(dev);
+
+	return 0;
+}
+
+static int mtk_dp_resume(struct device *dev)
+{
+	struct mtk_dp *mtk_dp = dev_get_drvdata(dev);
+
+	pm_runtime_get_sync(dev);
+
+	mtk_dp_init_port(mtk_dp);
+	mtk_dp_power_enable(mtk_dp);
+	mtk_dp_hwirq_enable(mtk_dp, true);
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(mtk_dp_pm_ops,
+		mtk_dp_suspend, mtk_dp_resume);
+
+static const struct mtk_dp_driver_data mt8195_dp_driver_data = {
+	.is_edp = false,
+};
+
+static const struct mtk_dp_driver_data mt8195_edp_driver_data = {
+	.is_edp = true,
+};
+
+static const struct of_device_id mtk_dp_of_match[] = {
+	{
+		.compatible = "mediatek,mt8195-dp_tx",
+		.data = &mt8195_dp_driver_data,
+	},
+	{
+		.compatible = "mediatek,mt8195-edp_tx",
+		.data = &mt8195_edp_driver_data,
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, mtk_dp_of_match);
+
+struct platform_driver mtk_dp_driver = {
+	.probe = mtk_dp_probe,
+	.remove = mtk_dp_remove,
+	.driver = {
+		.name = "mediatek-drm-dp",
+		.of_match_table = mtk_dp_of_match,
+		.pm = &mtk_dp_pm_ops,
+	},
+};
+
diff --git a/drivers/gpu/drm/mediatek/mtk_dp_reg.h b/drivers/gpu/drm/mediatek/mtk_dp_reg.h
new file mode 100644
index 000000000000..9df4e5026946
--- /dev/null
+++ b/drivers/gpu/drm/mediatek/mtk_dp_reg.h
@@ -0,0 +1,498 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2019 MediaTek Inc.
+ * Copyright (c) 2021 BayLibre
+ */
+#ifndef _MTK_DP_REG_H_
+#define _MTK_DP_REG_H_
+
+#define MTK_DP_SIP_CONTROL_AARCH32 0x82000523
+# define MTK_DP_SIP_ATF_VIDEO_UNMUTE 0x20
+# define MTK_DP_SIP_ATF_EDP_VIDEO_UNMUTE 0x21
+
+#define TOP_OFFSET		0x2000
+#define ENC0_OFFSET		0x3000
+#define ENC1_OFFSET		0x3200
+#define TRANS_OFFSET		0x3400
+#define AUX_OFFSET		0x3600
+#define SEC_OFFSET		0x4000
+
+#define MTK_DP_HPD_DISCONNECT	BIT(1)
+#define MTK_DP_HPD_CONNECT	BIT(2)
+#define MTK_DP_HPD_INTERRUPT	BIT(3)
+
+#define MTK_DP_ENC0_P0_3000              (ENC0_OFFSET + 0x000)
+# define LANE_NUM_DP_ENC0_P0_MASK                                      0x3
+# define VIDEO_MUTE_SW_DP_ENC0_P0_MASK                                 0x4
+# define VIDEO_MUTE_SW_DP_ENC0_P0_SHIFT                                2
+# define VIDEO_MUTE_SEL_DP_ENC0_P0_MASK                                0x8
+# define VIDEO_MUTE_SEL_DP_ENC0_P0_SHIFT                               3
+# define ENHANCED_FRAME_EN_DP_ENC0_P0_MASK                             0x10
+# define ENHANCED_FRAME_EN_DP_ENC0_P0_SHIFT                            4
+
+#define MTK_DP_ENC0_P0_3004              (ENC0_OFFSET + 0x004)
+# define VIDEO_M_CODE_SEL_DP_ENC0_P0_MASK                              0x100
+# define VIDEO_M_CODE_SEL_DP_ENC0_P0_SHIFT                             8
+# define DP_TX_ENCODER_4P_RESET_SW_DP_ENC0_P0_MASK                     0x200
+# define DP_TX_ENCODER_4P_RESET_SW_DP_ENC0_P0_SHIFT                    9
+
+#define MTK_DP_ENC0_P0_3008              (ENC0_OFFSET + 0x008)
+# define VIDEO_M_CODE_SW_0_DP_ENC0_P0_MASK                             0xffff
+
+#define MTK_DP_ENC0_P0_300C              (ENC0_OFFSET + 0x00C)
+# define VIDEO_M_CODE_SW_1_DP_ENC0_P0_MASK                             0xff
+
+#define MTK_DP_ENC0_P0_3010              (ENC0_OFFSET + 0x010)
+# define HTOTAL_SW_DP_ENC0_P0_MASK                                     0xffff
+
+#define MTK_DP_ENC0_P0_3014              (ENC0_OFFSET + 0x014)
+# define VTOTAL_SW_DP_ENC0_P0_MASK                                     0xffff
+
+#define MTK_DP_ENC0_P0_3018              (ENC0_OFFSET + 0x018)
+# define HSTART_SW_DP_ENC0_P0_MASK                                     0xffff
+
+#define MTK_DP_ENC0_P0_301C              (ENC0_OFFSET + 0x01C)
+# define VSTART_SW_DP_ENC0_P0_MASK                                     0xffff
+
+#define MTK_DP_ENC0_P0_3020              (ENC0_OFFSET + 0x020)
+# define HWIDTH_SW_DP_ENC0_P0_MASK                                     0xffff
+
+#define MTK_DP_ENC0_P0_3024              (ENC0_OFFSET + 0x024)
+# define VHEIGHT_SW_DP_ENC0_P0_MASK                                    0xffff
+
+#define MTK_DP_ENC0_P0_3028              (ENC0_OFFSET + 0x028)
+# define HSW_SW_DP_ENC0_P0_MASK                                        0x7fff
+# define HSW_SW_DP_ENC0_P0_SHIFT                                       0
+# define HSP_SW_DP_ENC0_P0_MASK                                        0x8000
+
+#define MTK_DP_ENC0_P0_302C              (ENC0_OFFSET + 0x02C)
+# define VSW_SW_DP_ENC0_P0_MASK                                        0x7fff
+# define VSW_SW_DP_ENC0_P0_SHIFT                                       0
+# define VSP_SW_DP_ENC0_P0_MASK                                        0x8000
+
+#define MTK_DP_ENC0_P0_3030              (ENC0_OFFSET + 0x030)
+# define HTOTAL_SEL_DP_ENC0_P0_SHIFT                                   0
+# define VTOTAL_SEL_DP_ENC0_P0_SHIFT                                   1
+# define HSTART_SEL_DP_ENC0_P0_SHIFT                                   2
+# define VSTART_SEL_DP_ENC0_P0_SHIFT                                   3
+# define HWIDTH_SEL_DP_ENC0_P0_SHIFT                                   4
+# define VHEIGHT_SEL_DP_ENC0_P0_SHIFT                                  5
+# define HSP_SEL_DP_ENC0_P0_SHIFT                                      6
+# define HSW_SEL_DP_ENC0_P0_SHIFT                                      7
+# define VSP_SEL_DP_ENC0_P0_SHIFT                                      8
+# define VSW_SEL_DP_ENC0_P0_SHIFT                                      9
+# define VBID_AUDIO_MUTE_FLAG_SW_DP_ENC0_P0_MASK                       0x800
+# define VBID_AUDIO_MUTE_SW_DP_ENC0_P0_SHIFT                           11
+# define VBID_AUDIO_MUTE_FLAG_SEL_DP_ENC0_P0_MASK                      0x1000
+# define VBID_AUDIO_MUTE_SEL_DP_ENC0_P0_SHIFT                          12
+
+#define MTK_DP_ENC0_P0_3034              (ENC0_OFFSET + 0x034)
+
+#define MTK_DP_ENC0_P0_3038              (ENC0_OFFSET + 0x038)
+# define VIDEO_SOURCE_SEL_DP_ENC0_P0_MASK                              0x800
+# define VIDEO_SOURCE_SEL_DP_ENC0_P0_SHIFT                             11
+
+#define MTK_DP_ENC0_P0_303C              (ENC0_OFFSET + 0x03C)
+# define SRAM_START_READ_THRD_DP_ENC0_P0_MASK                          0x3f
+# define SRAM_START_READ_THRD_DP_ENC0_P0_SHIFT                         0
+# define VIDEO_COLOR_DEPTH_DP_ENC0_P0_MASK                             0x700
+# define VIDEO_COLOR_DEPTH_DP_ENC0_P0_SHIFT                            8
+# define VIDEO_COLOR_DEPTH_DP_ENC0_P0_16BIT                            (0 << VIDEO_COLOR_DEPTH_DP_ENC0_P0_SHIFT)
+# define VIDEO_COLOR_DEPTH_DP_ENC0_P0_12BIT                            (1 << VIDEO_COLOR_DEPTH_DP_ENC0_P0_SHIFT)
+# define VIDEO_COLOR_DEPTH_DP_ENC0_P0_10BIT                            (2 << VIDEO_COLOR_DEPTH_DP_ENC0_P0_SHIFT)
+# define VIDEO_COLOR_DEPTH_DP_ENC0_P0_8BIT                             (3 << VIDEO_COLOR_DEPTH_DP_ENC0_P0_SHIFT)
+# define VIDEO_COLOR_DEPTH_DP_ENC0_P0_6BIT                             (4 << VIDEO_COLOR_DEPTH_DP_ENC0_P0_SHIFT)
+# define PIXEL_ENCODE_FORMAT_DP_ENC0_P0_MASK                           0x7000
+# define PIXEL_ENCODE_FORMAT_DP_ENC0_P0_SHIFT                          12
+# define PIXEL_ENCODE_FORMAT_DP_ENC0_P0_RGB                            (0 << PIXEL_ENCODE_FORMAT_DP_ENC0_P0_SHIFT)
+# define PIXEL_ENCODE_FORMAT_DP_ENC0_P0_YCBCR422                       (1 << PIXEL_ENCODE_FORMAT_DP_ENC0_P0_SHIFT)
+# define PIXEL_ENCODE_FORMAT_DP_ENC0_P0_YCBCR420                       (2 << PIXEL_ENCODE_FORMAT_DP_ENC0_P0_SHIFT)
+# define VIDEO_MN_GEN_EN_DP_ENC0_P0_MASK                               0x8000
+# define VIDEO_MN_GEN_EN_DP_ENC0_P0_SHIFT                              15
+
+#define MTK_DP_ENC0_P0_3040              (ENC0_OFFSET + 0x040)
+# define SDP_DOWN_CNT_INIT_DP_ENC0_P0_MASK                             0xfff
+# define SDP_DOWN_CNT_INIT_DP_ENC0_P0_SHIFT                            0
+
+#define MTK_DP_ENC0_P0_3044              (ENC0_OFFSET + 0x044)
+# define VIDEO_N_CODE_0_DP_ENC0_P0_MASK                                0xffff
+
+#define MTK_DP_ENC0_P0_3048              (ENC0_OFFSET + 0x048)
+# define VIDEO_N_CODE_1_DP_ENC0_P0_MASK                                0xff
+
+#define MTK_DP_ENC0_P0_304C              (ENC0_OFFSET + 0x04C)
+# define VBID_VIDEO_MUTE_DP_ENC0_P0_MASK                                 0x4
+# define SDP_VSYNC_RISING_MASK_DP_ENC0_P0_MASK                           0x100
+
+#define MTK_DP_ENC0_P0_3050              (ENC0_OFFSET + 0x050)
+# define VIDEO_N_CODE_MN_GEN_0_DP_ENC0_P0_MASK                           0xffff
+
+#define MTK_DP_ENC0_P0_3054              (ENC0_OFFSET + 0x054)
+# define VIDEO_N_CODE_MN_GEN_1_DP_ENC0_P0_MASK                           0xff
+
+#define MTK_DP_ENC0_P0_3064              (ENC0_OFFSET + 0x064)
+# define HDE_NUM_LAST_DP_ENC0_P0_MASK                                    0xffff
+
+#define MTK_DP_ENC0_P0_3088              (ENC0_OFFSET + 0x088)
+# define AU_EN_DP_ENC0_P0_MASK                                           0x40
+# define AU_EN_DP_ENC0_P0_SHIFT                                          6
+# define AUDIO_8CH_EN_DP_ENC0_P0_MASK                                    0x80
+# define AUDIO_8CH_SEL_DP_ENC0_P0_MASK                                   0x100
+# define AUDIO_2CH_EN_DP_ENC0_P0_MASK                                    0x4000
+# define AUDIO_2CH_SEL_DP_ENC0_P0_MASK                                   0x8000
+
+#define MTK_DP_ENC0_P0_308C              (ENC0_OFFSET + 0x08C)
+# define CH_STATUS_0_DP_ENC0_P0_MASK                                     0xffff
+
+#define MTK_DP_ENC0_P0_3090              (ENC0_OFFSET + 0x090)
+# define CH_STATUS_1_DP_ENC0_P0_MASK                                     0xffff
+
+#define MTK_DP_ENC0_P0_3094              (ENC0_OFFSET + 0x094)
+# define CH_STATUS_2_DP_ENC0_P0_MASK                                     0xff
+
+#define MTK_DP_ENC0_P0_30A0              (ENC0_OFFSET + 0x0A0)
+
+#define MTK_DP_ENC0_P0_30A4              (ENC0_OFFSET + 0x0A4)
+# define AU_TS_CFG_DP_ENC0_P0_MASK                                       0xff
+
+#define MTK_DP_ENC0_P0_30A8              (ENC0_OFFSET + 0x0A8)
+
+#define MTK_DP_ENC0_P0_30AC              (ENC0_OFFSET + 0x0AC)
+
+#define MTK_DP_ENC0_P0_30B0              (ENC0_OFFSET + 0x0B0)
+
+#define MTK_DP_ENC0_P0_30B4              (ENC0_OFFSET + 0x0B4)
+# define ISRC_CFG_DP_ENC0_P0_MASK                                        0xff00
+# define ISRC_CFG_DP_ENC0_P0_SHIFT                                       8
+
+#define MTK_DP_ENC0_P0_30B8              (ENC0_OFFSET + 0x0B8)
+
+#define MTK_DP_ENC0_P0_30BC              (ENC0_OFFSET + 0x0BC)
+# define ISRC_CONT_DP_ENC0_P0_MASK                                       0x1
+# define ISRC_CONT_DP_ENC0_P0_SHIFT                                      0
+# define AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_MASK                       0x700
+# define AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_SHIFT                      8
+
+#define MTK_DP_ENC0_P0_30D8              (ENC0_OFFSET + 0x0D8)
+
+#define MTK_DP_ENC0_P0_312C              (ENC0_OFFSET + 0x12C)
+# define ASP_HB2_DP_ENC0_P0_MASK                                         0xff
+# define ASP_HB3_DP_ENC0_P0_MASK                                         0xff00
+# define ASP_HB3_DP_ENC0_P0_SHIFT                                        8
+
+#define MTK_DP_ENC0_P0_3130              (ENC0_OFFSET + 0x130)
+
+#define MTK_DP_ENC0_P0_3138              (ENC0_OFFSET + 0x138)
+
+#define MTK_DP_ENC0_P0_3154              (ENC0_OFFSET + 0x154)
+# define PGEN_HTOTAL_DP_ENC0_P0_MASK                                     0x3fff
+
+#define MTK_DP_ENC0_P0_3158              (ENC0_OFFSET + 0x158)
+# define PGEN_HSYNC_RISING_DP_ENC0_P0_MASK                               0x3fff
+
+#define MTK_DP_ENC0_P0_315C              (ENC0_OFFSET + 0x15C)
+# define PGEN_HSYNC_PULSE_WIDTH_DP_ENC0_P0_MASK                          0x3fff
+
+#define MTK_DP_ENC0_P0_3160              (ENC0_OFFSET + 0x160)
+# define PGEN_HFDE_START_DP_ENC0_P0_MASK                                 0x3fff
+
+#define MTK_DP_ENC0_P0_3164              (ENC0_OFFSET + 0x164)
+# define PGEN_HFDE_ACTIVE_WIDTH_DP_ENC0_P0_MASK                          0x3fff
+
+#define MTK_DP_ENC0_P0_3168              (ENC0_OFFSET + 0x168)
+# define PGEN_VTOTAL_DP_ENC0_P0_MASK                                     0x1fff
+
+#define MTK_DP_ENC0_P0_316C              (ENC0_OFFSET + 0x16C)
+# define PGEN_VSYNC_RISING_DP_ENC0_P0_MASK                               0x1fff
+
+#define MTK_DP_ENC0_P0_3170              (ENC0_OFFSET + 0x170)
+# define PGEN_VSYNC_PULSE_WIDTH_DP_ENC0_P0_MASK                          0x1fff
+
+#define MTK_DP_ENC0_P0_3174              (ENC0_OFFSET + 0x174)
+# define PGEN_VFDE_START_DP_ENC0_P0_MASK                                 0x1fff
+
+#define MTK_DP_ENC0_P0_3178              (ENC0_OFFSET + 0x178)
+# define PGEN_VFDE_ACTIVE_WIDTH_DP_ENC0_P0_MASK                          0x1fff
+
+#define MTK_DP_ENC0_P0_31B0              (ENC0_OFFSET + 0x1B0)
+
+#define MTK_DP_ENC0_P0_31C8              (ENC0_OFFSET + 0x1C8)
+# define VSC_EXT_VESA_HB0_DP_ENC0_P0_MASK                                0xff
+# define VSC_EXT_VESA_HB1_DP_ENC0_P0_MASK                                0xff00
+# define VSC_EXT_VESA_HB1_DP_ENC0_P0_SHIFT                               8
+
+#define MTK_DP_ENC0_P0_31CC              (ENC0_OFFSET + 0x1CC)
+# define VSC_EXT_VESA_HB2_DP_ENC0_P0_MASK                                0xff
+# define VSC_EXT_VESA_HB2_DP_ENC0_P0_SHIFT                               0
+# define VSC_EXT_VESA_HB3_DP_ENC0_P0_MASK                                0xff00
+
+#define MTK_DP_ENC0_P0_31D0              (ENC0_OFFSET + 0x1D0)
+# define VSC_EXT_CEA_HB0_DP_ENC0_P0_MASK                                 0xff
+# define VSC_EXT_CEA_HB1_DP_ENC0_P0_MASK                                 0xff00
+# define VSC_EXT_CEA_HB1_DP_ENC0_P0_SHIFT                                8
+
+#define MTK_DP_ENC0_P0_31D4              (ENC0_OFFSET + 0x1D4)
+# define VSC_EXT_CEA_HB2_DP_ENC0_P0_MASK                                 0xff
+# define VSC_EXT_CEA_HB2_DP_ENC0_P0_SHIFT                                0
+# define VSC_EXT_CEA_HB3_DP_ENC0_P0_MASK                                 0xff00
+
+#define MTK_DP_ENC0_P0_31D8              (ENC0_OFFSET + 0x1D8)
+# define VSC_EXT_VESA_NUM_DP_ENC0_P0_MASK                                0x3f
+# define VSC_EXT_VESA_NUM_DP_ENC0_P0_SHIFT                               0
+# define VSC_EXT_CEA_NUM_DP_ENC0_P0_MASK                                 0x3f00
+# define VSC_EXT_CEA_NUM_DP_ENC0_P0_SHIFT                                8
+
+#define MTK_DP_ENC0_P0_31DC              (ENC0_OFFSET + 0x1DC)
+# define HDR0_CFG_DP_ENC0_P0_MASK                                        0xff
+# define HDR0_CFG_DP_ENC0_P0_SHIFT                                       0
+
+#define MTK_DP_ENC0_P0_31E8              (ENC0_OFFSET + 0x1E8)
+
+#define MTK_DP_ENC0_P0_31EC              (ENC0_OFFSET + 0x1EC)
+# define AUDIO_CH_SRC_SEL_DP_ENC0_P0_MASK                                0x10
+# define AUDIO_CH_SRC_SEL_DP_ENC0_P0_SHIFT                               4
+# define ISRC1_HB3_DP_ENC0_P0_MASK                                       0xff00
+# define ISRC1_HB3_DP_ENC0_P0_SHIFT                                      8
+
+#define MTK_DP_ENC1_P0_3200              (ENC1_OFFSET + 0x000)
+
+#define MTK_DP_ENC1_P0_3280              (ENC1_OFFSET + 0x080)
+# define SDP_PACKET_TYPE_DP_ENC1_P0_MASK                                 0x1f
+# define SDP_PACKET_W_DP_ENC1_P0                                         0x20
+# define SDP_PACKET_W_DP_ENC1_P0_MASK                                    0x20
+# define SDP_PACKET_W_DP_ENC1_P0_SHIFT                                   5
+
+#define MTK_DP_ENC1_P0_328C              (ENC1_OFFSET + 0x08C)
+
+#define MTK_DP_ENC1_P0_3290              (ENC1_OFFSET + 0x090)
+
+#define MTK_DP_ENC1_P0_32A0              (ENC1_OFFSET + 0x0A0)
+
+#define MTK_DP_ENC1_P0_32A4              (ENC1_OFFSET + 0x0A4)
+
+#define MTK_DP_ENC1_P0_3300              (ENC1_OFFSET + 0x100)
+# define VIDEO_AFIFO_RDY_SEL_DP_ENC1_P0_MASK                             0x300
+# define VIDEO_AFIFO_RDY_SEL_DP_ENC1_P0_SHIFT                            8
+
+#define MTK_DP_ENC1_P0_3304              (ENC1_OFFSET + 0x104)
+# define AU_PRTY_REGEN_DP_ENC1_P0_MASK                                   0x100
+# define AU_CH_STS_REGEN_DP_ENC1_P0_MASK                                 0x200
+# define AUDIO_SAMPLE_PRSENT_REGEN_DP_ENC1_P0_MASK                       0x1000
+
+#define MTK_DP_ENC1_P0_3324              (ENC1_OFFSET + 0x124)
+# define AUDIO_SOURCE_MUX_DP_ENC1_P0_MASK                                0x300
+# define AUDIO_SOURCE_MUX_DP_ENC1_P0_SHIFT                               8
+# define AUDIO_SOURCE_MUX_DP_ENC1_P0_DPRX                                (0 << AUDIO_SOURCE_MUX_DP_ENC1_P0_SHIFT)
+
+#define MTK_DP_ENC1_P0_3364              (ENC1_OFFSET + 0x164)
+# define SDP_DOWN_CNT_INIT_IN_HBLANK_DP_ENC1_P0_MASK                     0xfff
+# define SDP_DOWN_CNT_INIT_IN_HBLANK_DP_ENC1_P0_SHIFT                    0
+# define FIFO_READ_START_POINT_DP_ENC1_P0_MASK                           0xf000
+# define FIFO_READ_START_POINT_DP_ENC1_P0_SHIFT                          12
+
+#define MTK_DP_ENC1_P0_3368              (ENC1_OFFSET + 0x168)
+# define VIDEO_SRAM_FIFO_CNT_RESET_SEL_DP_ENC1_P0_SHIFT                  0
+# define VIDEO_STABLE_CNT_THRD_DP_ENC1_P0_SHIFT                          4
+# define SDP_DP13_EN_DP_ENC1_P0_SHIFT                                    8
+# define BS2BS_MODE_DP_ENC1_P0_MASK                                      0x3000
+# define BS2BS_MODE_DP_ENC1_P0_SHIFT                                     12
+
+#define MTK_DP_ENC1_P0_33F4              (ENC1_OFFSET + 0x1F4)
+
+#define MTK_DP_TRANS_P0_3400              (TRANS_OFFSET + 0x000)
+# define PATTERN1_EN_DP_TRANS_P0_MASK                                        0x1000
+# define PATTERN1_EN_DP_TRANS_P0_SHIFT                                       12
+# define PATTERN2_EN_DP_TRANS_P0_MASK                                        0x2000
+# define PATTERN3_EN_DP_TRANS_P0_MASK                                        0x4000
+# define PATTERN4_EN_DP_TRANS_P0_MASK                                        0x8000
+
+#define MTK_DP_TRANS_P0_3404              (TRANS_OFFSET + 0x004)
+# define DP_SCR_EN_DP_TRANS_P0_MASK                                          0x1
+
+#define MTK_DP_TRANS_P0_340C              (TRANS_OFFSET + 0x00C)
+# define DP_TX_TRANSMITTER_4P_RESET_SW_DP_TRANS_P0_MASK                      0x2000
+# define DP_TX_TRANSMITTER_4P_RESET_SW_DP_TRANS_P0_SHIFT                     13
+
+#define MTK_DP_TRANS_P0_3410              (TRANS_OFFSET + 0x010)
+# define HPD_DEB_THD_DP_TRANS_P0_MASK                                        0xf
+# define HPD_DEB_THD_DP_TRANS_P0_SHIFT                                       0
+# define HPD_INT_THD_DP_TRANS_P0_MASK                                        0xf0
+# define HPD_INT_THD_DP_TRANS_P0_SHIFT                                       4
+# define HPD_INT_THD_DP_TRANS_P0_LOWER_500US                                 (2 << HPD_INT_THD_DP_TRANS_P0_SHIFT)
+# define HPD_INT_THD_DP_TRANS_P0_UPPER_1100US                                (2 << (HPD_INT_THD_DP_TRANS_P0_SHIFT + 2))
+# define HPD_DISC_THD_DP_TRANS_P0_MASK                                       0xf00
+# define HPD_DISC_THD_DP_TRANS_P0_SHIFT                                      8
+# define HPD_CONN_THD_DP_TRANS_P0_MASK                                       0xf000
+# define HPD_CONN_THD_DP_TRANS_P0_SHIFT                                      12
+
+#define MTK_DP_TRANS_P0_3414              (TRANS_OFFSET + 0x014)
+# define HPD_DB_DP_TRANS_P0_MASK                                             0x4
+
+#define MTK_DP_TRANS_P0_3418              (TRANS_OFFSET + 0x018)
+# define IRQ_CLR_DP_TRANS_P0_MASK                                            0xf
+# define IRQ_MASK_DP_TRANS_P0_MASK                                           0xf0
+# define IRQ_MASK_DP_TRANS_P0_SHIFT                                          4
+# define IRQ_MASK_DP_TRANS_P0_DISC_IRQ                                       (BIT(1) << IRQ_MASK_DP_TRANS_P0_SHIFT)
+# define IRQ_MASK_DP_TRANS_P0_CONN_IRQ                                       (BIT(2) << IRQ_MASK_DP_TRANS_P0_SHIFT)
+# define IRQ_MASK_DP_TRANS_P0_INT_IRQ                                        (BIT(3) << IRQ_MASK_DP_TRANS_P0_SHIFT)
+# define IRQ_STATUS_DP_TRANS_P0_MASK                                         0xf000
+# define IRQ_STATUS_DP_TRANS_P0_SHIFT                                        12
+
+#define MTK_DP_TRANS_P0_342C              (TRANS_OFFSET + 0x02C)
+# define XTAL_FREQ_DP_TRANS_P0_DEFAULT                                       0x69
+# define XTAL_FREQ_DP_TRANS_P0_MASK                                          0xff
+
+#define MTK_DP_TRANS_P0_3430              (TRANS_OFFSET + 0x030)
+# define HPD_INT_THD_ECO_DP_TRANS_P0_MASK                                    0x3
+# define HPD_INT_THD_ECO_DP_TRANS_P0_HIGH_BOUND_EXT                          BIT(1)
+
+#define MTK_DP_TRANS_P0_34A4              (TRANS_OFFSET + 0x0A4)
+# define LANE_NUM_DP_TRANS_P0_MASK                                           0xc
+# define LANE_NUM_DP_TRANS_P0_SHIFT                                          2
+
+#define MTK_DP_TRANS_P0_3540              (TRANS_OFFSET + 0x140)
+# define FEC_EN_DP_TRANS_P0_MASK                                             0x1
+# define FEC_EN_DP_TRANS_P0_SHIFT                                            0
+# define FEC_CLOCK_EN_MODE_DP_TRANS_P0_MASK                                  0x8
+# define FEC_CLOCK_EN_MODE_DP_TRANS_P0_SHIFT                                 3
+
+#define MTK_DP_TRANS_P0_3580              (TRANS_OFFSET + 0x180)
+# define POST_MISC_DATA_LANE0_OV_DP_TRANS_P0_MASK                            0x100
+# define POST_MISC_DATA_LANE1_OV_DP_TRANS_P0_MASK                            0x200
+# define POST_MISC_DATA_LANE2_OV_DP_TRANS_P0_MASK                            0x400
+# define POST_MISC_DATA_LANE3_OV_DP_TRANS_P0_MASK                            0x800
+
+#define MTK_DP_TRANS_P0_35C4              (TRANS_OFFSET + 0x1C4)
+# define SW_IRQ_MASK_DP_TRANS_P0_MASK                                        0xffff
+
+#define MTK_DP_TRANS_P0_35C8              (TRANS_OFFSET + 0x1C8)
+# define SW_IRQ_CLR_DP_TRANS_P0_MASK                                         0xffff
+
+# define SW_IRQ_STATUS_DP_TRANS_P0_MASK                                      0xffff
+# define SW_IRQ_STATUS_DP_TRANS_P0_SHIFT                                     0
+
+#define MTK_DP_TRANS_P0_35D0              (TRANS_OFFSET + 0x1D0)
+# define SW_IRQ_FINAL_STATUS_DP_TRANS_P0_MASK                                0xffff
+
+#define MTK_DP_TRANS_P0_35F0              (TRANS_OFFSET + 0x1F0)
+
+#define MTK_DP_AUX_P0_360C              (AUX_OFFSET + 0x00C)
+# define AUX_TIMEOUT_THR_AUX_TX_P0_MASK                                      0x1fff
+
+#define MTK_DP_AUX_P0_3614              (AUX_OFFSET + 0x014)
+# define AUX_RX_UI_CNT_THR_AUX_TX_P0_MASK                                    0x7f
+# define AUX_RX_UI_CNT_THR_AUX_TX_P0_SHIFT                                   0
+
+#define MTK_DP_AUX_P0_3618              (AUX_OFFSET + 0x018)
+# define AUX_RX_FIFO_FULL_AUX_TX_P0_MASK                                     0x200
+# define AUX_RX_FIFO_WRITE_POINTER_AUX_TX_P0_MASK                            0xf
+
+#define MTK_DP_AUX_P0_3620              (AUX_OFFSET + 0x020)
+# define AUX_RD_MODE_AUX_TX_P0_MASK                                          0x200
+# define AUX_RX_FIFO_READ_PULSE_TX_P0_MASK                                   0x100
+# define AUX_RX_FIFO_R_PULSE_TX_P0_SHIFT                                     8
+# define AUX_RX_FIFO_READ_DATA_AUX_TX_P0_MASK                                0xff
+# define AUX_RX_FIFO_READ_DATA_AUX_TX_P0_SHIFT                               0
+
+#define MTK_DP_AUX_P0_3624              (AUX_OFFSET + 0x024)
+# define AUX_RX_REPLY_COMMAND_AUX_TX_P0_MASK                                 0xf
+
+#define MTK_DP_AUX_P0_3628              (AUX_OFFSET + 0x028)
+# define AUX_RX_PHY_STATE_AUX_TX_P0_MASK                                     0x3ff
+# define AUX_RX_PHY_STATE_AUX_TX_P0_SHIFT                                    0
+# define AUX_RX_PHY_STATE_AUX_TX_P0_RX_IDLE                                  (BIT(1) << AUX_RX_PHY_STATE_AUX_TX_P0_SHIFT)
+
+#define MTK_DP_AUX_P0_362C              (AUX_OFFSET + 0x02C)
+# define AUX_NO_LENGTH_AUX_TX_P0_MASK                                        0x1
+# define AUX_NO_LENGTH_AUX_TX_P0_SHIFT                                       0
+# define AUX_TX_AUXTX_OV_EN_AUX_TX_P0_MASK                                   0x2
+# define AUX_RESERVED_RW_0_AUX_TX_P0_MASK                                    0xfffc
+
+#define MTK_DP_AUX_P0_3630              (AUX_OFFSET + 0x030)
+# define AUX_TX_REQUEST_READY_AUX_TX_P0_MASK                                 0x8
+# define AUX_TX_REQUEST_READY_AUX_TX_P0_SHIFT                                3
+
+#define MTK_DP_AUX_P0_3634              (AUX_OFFSET + 0x034)
+# define AUX_TX_OVER_SAMPLE_RATE_AUX_TX_P0_MASK                              0xff00
+# define AUX_TX_OVER_SAMPLE_RATE_AUX_TX_P0_SHIFT                             8
+
+#define MTK_DP_AUX_P0_3640              (AUX_OFFSET + 0x040)
+# define AUX_RX_RECV_COMPLETE_IRQ_TX_P0_MASK                                 0x40
+# define AUX_RX_AUX_RECV_COMPLETE_IRQ_AUX_TX_P0_SHIFT                        6
+# define AUX_RX_EDID_RECV_COMPLETE_IRQ_AUX_TX_P0_SHIFT                       5
+# define AUX_RX_MCCS_RECV_COMPLETE_IRQ_AUX_TX_P0_SHIFT                       4
+# define AUX_RX_CMD_RECV_IRQ_AUX_TX_P0_SHIFT                                 3
+# define AUX_RX_ADDR_RECV_IRQ_AUX_TX_P0_SHIFT                                2
+# define AUX_RX_DATA_RECV_IRQ_AUX_TX_P0_SHIFT                                1
+# define AUX_400US_TIMEOUT_IRQ_AUX_TX_P0_MASK                                0x1
+# define AUX_400US_TIMEOUT_IRQ_AUX_TX_P0_SHIFT                               0
+
+#define MTK_DP_AUX_P0_3644              (AUX_OFFSET + 0x044)
+# define MCU_REQUEST_COMMAND_AUX_TX_P0_MASK                                  0xf
+
+#define MTK_DP_AUX_P0_3648              (AUX_OFFSET + 0x048)
+# define MCU_REQUEST_ADDRESS_LSB_AUX_TX_P0_MASK                              0xffff
+
+#define MTK_DP_AUX_P0_364C              (AUX_OFFSET + 0x04C)
+# define MCU_REQUEST_ADDRESS_MSB_AUX_TX_P0_MASK                              0xf
+
+#define MTK_DP_AUX_P0_3650              (AUX_OFFSET + 0x050)
+# define MCU_REQ_DATA_NUM_AUX_TX_P0_MASK                                     0xf000
+# define MCU_REQ_DATA_NUM_AUX_TX_P0_SHIFT                                    12
+# define PHY_FIFO_RST_AUX_TX_P0_MASK                                         0x200
+# define MCU_ACK_TRAN_COMPLETE_AUX_TX_P0_MASK                                0x100
+# define MCU_ACK_TRAN_COMPLETE_AUX_TX_P0_SHIFT                               8
+
+#define MTK_DP_AUX_P0_3658              (AUX_OFFSET + 0x058)
+# define AUX_TX_OV_EN_AUX_TX_P0_MASK                                         0x1
+
+#define MTK_DP_AUX_P0_3690              (AUX_OFFSET + 0x090)
+# define RX_REPLY_COMPLETE_MODE_AUX_TX_P0_MASK                               0x100
+# define RX_REPLY_COMPLETE_MODE_AUX_TX_P0_SHIFT                              8
+
+#define MTK_DP_AUX_P0_3704              (AUX_OFFSET + 0x104)
+# define AUX_TX_FIFO_WRITE_DATA_NEW_MODE_TOGGLE_AUX_TX_P0_MASK               0x2
+# define AUX_TX_FIFO_NEW_MODE_EN_AUX_TX_P0_MASK                              0x4
+# define AUX_TX_FIFO_NEW_MODE_EN_AUX_TX_P0_SHIFT                             2
+
+#define MTK_DP_AUX_P0_3708              (AUX_OFFSET + 0x108)
+
+#define MTK_DP_AUX_P0_37C8              (AUX_OFFSET + 0x1C8)
+# define MTK_ATOP_EN_AUX_TX_P0_MASK                                          0x1
+# define MTK_ATOP_EN_AUX_TX_P0_SHIFT                                         0
+
+#define MTK_DP_TOP_PWR_STATE              (TOP_OFFSET + 0x00)
+# define DP_PWR_STATE_MASK                                                   0x3
+# define DP_PWR_STATE_BANDGAP                                                1
+# define DP_PWR_STATE_BANDGAP_TPLL                                           2
+# define DP_PWR_STATE_BANDGAP_TPLL_LANE                                      3
+
+#define MTK_DP_TOP_SWING_EMP              (TOP_OFFSET + 0x04)
+# define DP_TX0_VOLT_SWING_MASK                                              0x3
+# define DP_TX0_VOLT_SWING_SHIFT                                             0
+# define DP_TX0_PRE_EMPH_MASK                                                0xc
+# define DP_TX0_PRE_EMPH_SHIFT                                               2
+# define DP_TX1_VOLT_SWING_MASK                                              0x300
+# define DP_TX1_VOLT_SWING_SHIFT                                             8
+# define DP_TX1_PRE_EMPH_MASK                                                0xc00
+# define DP_TX2_VOLT_SWING_MASK                                              0x30000
+# define DP_TX2_PRE_EMPH_MASK                                                0xc0000
+# define DP_TX3_VOLT_SWING_MASK                                              0x3000000
+# define DP_TX3_PRE_EMPH_MASK                                                0xc000000
+
+#define MTK_DP_TOP_RESET_AND_PROBE              (TOP_OFFSET + 0x20)
+# define SW_RST_B_SHIFT                                           0
+# define SW_RST_B_PHYD                                            (BIT(4) << SW_RST_B_SHIFT)
+
+#define MTK_DP_TOP_IRQ_STATUS              (TOP_OFFSET + 0x28)
+# define RGS_IRQ_STATUS_SHIFT                                     0
+# define RGS_IRQ_STATUS_TRANSMITTER                               (BIT(1) << RGS_IRQ_STATUS_SHIFT)
+
+#define MTK_DP_TOP_IRQ_MASK              (TOP_OFFSET + 0x2C)
+# define IRQ_MASK_AUX_TOP_IRQ                                     BIT(2)
+
+#define MTK_DP_TOP_MEM_PD              (TOP_OFFSET + 0x38)
+# define MEM_ISO_EN_SHIFT                                         0
+# define FUSE_SEL_SHIFT                                           2
+
+#endif /*_MTK_DP_REG_H_*/
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
index 1ff4e31c8634..65c7ccaaf196 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
@@ -672,6 +672,7 @@ static struct platform_driver * const mtk_drm_drivers[] = {
 	&mtk_disp_ovl_driver,
 	&mtk_disp_rdma_driver,
 	&mtk_dpi_driver,
+	&mtk_dp_driver,
 	&mtk_drm_platform_driver,
 	&mtk_dsi_driver,
 };
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.h b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
index 3e7d1e6fbe01..8926416f4419 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
@@ -53,6 +53,7 @@ extern struct platform_driver mtk_disp_gamma_driver;
 extern struct platform_driver mtk_disp_ovl_driver;
 extern struct platform_driver mtk_disp_rdma_driver;
 extern struct platform_driver mtk_dpi_driver;
+extern struct platform_driver mtk_dp_driver;
 extern struct platform_driver mtk_dsi_driver;
 
 #endif /* MTK_DRM_DRV_H */
diff --git a/drivers/phy/mediatek/Kconfig b/drivers/phy/mediatek/Kconfig
index 55f8e6c048ab..f7ec86059049 100644
--- a/drivers/phy/mediatek/Kconfig
+++ b/drivers/phy/mediatek/Kconfig
@@ -55,3 +55,11 @@ config PHY_MTK_MIPI_DSI
 	select GENERIC_PHY
 	help
 	  Support MIPI DSI for Mediatek SoCs.
+
+config PHY_MTK_DP
+	tristate "MediaTek DP-PHY Driver"
+	depends on ARCH_MEDIATEK || COMPILE_TEST
+	depends on OF
+	select GENERIC_PHY
+	help
+	  Support DisplayPort PHY for Mediatek SoCs.
diff --git a/drivers/phy/mediatek/Makefile b/drivers/phy/mediatek/Makefile
index ace660fbed3a..4ba1e0650434 100644
--- a/drivers/phy/mediatek/Makefile
+++ b/drivers/phy/mediatek/Makefile
@@ -3,6 +3,7 @@
 # Makefile for the phy drivers.
 #
 
+obj-$(CONFIG_PHY_MTK_DP)		+= phy-mtk-dp.o
 obj-$(CONFIG_PHY_MTK_TPHY)		+= phy-mtk-tphy.o
 obj-$(CONFIG_PHY_MTK_UFS)		+= phy-mtk-ufs.o
 obj-$(CONFIG_PHY_MTK_XSPHY)		+= phy-mtk-xsphy.o
diff --git a/drivers/phy/mediatek/phy-mtk-dp.c b/drivers/phy/mediatek/phy-mtk-dp.c
new file mode 100644
index 000000000000..7a1141715ea2
--- /dev/null
+++ b/drivers/phy/mediatek/phy-mtk-dp.c
@@ -0,0 +1,218 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2021 BayLibre
+ * Author: Markus Schneider-Pargmann <msp@baylibre.com>
+ */
+
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#define PHY_OFFSET 0x1000
+
+#define MTK_DP_PHY_DIG_PLL_CTL_1		(PHY_OFFSET + 0x014)
+# define TPLL_SSC_EN				BIT(3)
+
+#define MTK_DP_PHY_DIG_BIT_RATE			(PHY_OFFSET + 0x03C)
+# define BIT_RATE_RBR				0
+# define BIT_RATE_HBR				1
+# define BIT_RATE_HBR2				2
+# define BIT_RATE_HBR3				3
+
+#define MTK_DP_PHY_DIG_SW_RST			(PHY_OFFSET + 0x038)
+# define DP_GLB_SW_RST_PHYD			BIT(0)
+
+#define MTK_DP_LANE0_DRIVING_PARAM_3		(PHY_OFFSET + 0x138)
+#define MTK_DP_LANE1_DRIVING_PARAM_3		(PHY_OFFSET + 0x238)
+#define MTK_DP_LANE2_DRIVING_PARAM_3		(PHY_OFFSET + 0x338)
+#define MTK_DP_LANE3_DRIVING_PARAM_3		(PHY_OFFSET + 0x438)
+# define XTP_LN_TX_LCTXC0_SW0_PRE0_DEFAULT	0x10
+# define XTP_LN_TX_LCTXC0_SW0_PRE1_DEFAULT	(0x14 << 8)
+# define XTP_LN_TX_LCTXC0_SW0_PRE2_DEFAULT	(0x18 << 16)
+# define XTP_LN_TX_LCTXC0_SW0_PRE3_DEFAULT	(0x20 << 24)
+# define DRIVING_PARAM_3_DEFAULT		(XTP_LN_TX_LCTXC0_SW0_PRE0_DEFAULT | \
+						 XTP_LN_TX_LCTXC0_SW0_PRE1_DEFAULT | \
+						 XTP_LN_TX_LCTXC0_SW0_PRE2_DEFAULT | \
+						 XTP_LN_TX_LCTXC0_SW0_PRE3_DEFAULT)
+
+#define MTK_DP_LANE0_DRIVING_PARAM_4		(PHY_OFFSET + 0x13C)
+#define MTK_DP_LANE1_DRIVING_PARAM_4		(PHY_OFFSET + 0x23C)
+#define MTK_DP_LANE2_DRIVING_PARAM_4		(PHY_OFFSET + 0x33C)
+#define MTK_DP_LANE3_DRIVING_PARAM_4		(PHY_OFFSET + 0x43C)
+# define XTP_LN_TX_LCTXC0_SW1_PRE0_DEFAULT	0x18
+# define XTP_LN_TX_LCTXC0_SW1_PRE1_DEFAULT	(0x1e << 8)
+# define XTP_LN_TX_LCTXC0_SW1_PRE2_DEFAULT	(0x24 << 16)
+# define XTP_LN_TX_LCTXC0_SW2_PRE0_DEFAULT	(0x20 << 24)
+# define DRIVING_PARAM_4_DEFAULT		(XTP_LN_TX_LCTXC0_SW1_PRE0_DEFAULT | \
+						 XTP_LN_TX_LCTXC0_SW1_PRE1_DEFAULT | \
+						 XTP_LN_TX_LCTXC0_SW1_PRE2_DEFAULT | \
+						 XTP_LN_TX_LCTXC0_SW2_PRE0_DEFAULT)
+
+#define MTK_DP_LANE0_DRIVING_PARAM_5		(PHY_OFFSET + 0x140)
+#define MTK_DP_LANE1_DRIVING_PARAM_5		(PHY_OFFSET + 0x240)
+#define MTK_DP_LANE2_DRIVING_PARAM_5		(PHY_OFFSET + 0x340)
+#define MTK_DP_LANE3_DRIVING_PARAM_5		(PHY_OFFSET + 0x440)
+# define XTP_LN_TX_LCTXC0_SW2_PRE1_DEFAULT	0x28
+# define XTP_LN_TX_LCTXC0_SW3_PRE0_DEFAULT	(0x30 << 8)
+# define DRIVING_PARAM_5_DEFAULT		(XTP_LN_TX_LCTXC0_SW2_PRE1_DEFAULT | \
+						 XTP_LN_TX_LCTXC0_SW3_PRE0_DEFAULT)
+
+#define MTK_DP_LANE0_DRIVING_PARAM_6		(PHY_OFFSET + 0x144)
+#define MTK_DP_LANE1_DRIVING_PARAM_6		(PHY_OFFSET + 0x244)
+#define MTK_DP_LANE2_DRIVING_PARAM_6		(PHY_OFFSET + 0x344)
+#define MTK_DP_LANE3_DRIVING_PARAM_6		(PHY_OFFSET + 0x444)
+# define XTP_LN_TX_LCTXCP1_SW0_PRE0_DEFAULT	0x00
+# define XTP_LN_TX_LCTXCP1_SW0_PRE1_DEFAULT	(0x04 << 8)
+# define XTP_LN_TX_LCTXCP1_SW0_PRE2_DEFAULT	(0x08 << 16)
+# define XTP_LN_TX_LCTXCP1_SW0_PRE3_DEFAULT	(0x10 << 24)
+# define DRIVING_PARAM_6_DEFAULT		(XTP_LN_TX_LCTXCP1_SW0_PRE0_DEFAULT | \
+						 XTP_LN_TX_LCTXCP1_SW0_PRE1_DEFAULT | \
+						 XTP_LN_TX_LCTXCP1_SW0_PRE2_DEFAULT | \
+						 XTP_LN_TX_LCTXCP1_SW0_PRE3_DEFAULT)
+
+#define MTK_DP_LANE0_DRIVING_PARAM_7		(PHY_OFFSET + 0x148)
+#define MTK_DP_LANE1_DRIVING_PARAM_7		(PHY_OFFSET + 0x248)
+#define MTK_DP_LANE2_DRIVING_PARAM_7		(PHY_OFFSET + 0x348)
+#define MTK_DP_LANE3_DRIVING_PARAM_7		(PHY_OFFSET + 0x448)
+# define XTP_LN_TX_LCTXCP1_SW1_PRE0_DEFAULT	0x00
+# define XTP_LN_TX_LCTXCP1_SW1_PRE1_DEFAULT	(0x06 << 8)
+# define XTP_LN_TX_LCTXCP1_SW1_PRE2_DEFAULT	(0x0c << 16)
+# define XTP_LN_TX_LCTXCP1_SW2_PRE0_DEFAULT	(0x00 << 24)
+# define DRIVING_PARAM_7_DEFAULT		(XTP_LN_TX_LCTXCP1_SW1_PRE0_DEFAULT | \
+						 XTP_LN_TX_LCTXCP1_SW1_PRE1_DEFAULT | \
+						 XTP_LN_TX_LCTXCP1_SW1_PRE2_DEFAULT | \
+						 XTP_LN_TX_LCTXCP1_SW2_PRE0_DEFAULT)
+
+#define MTK_DP_LANE0_DRIVING_PARAM_8		(PHY_OFFSET + 0x14C)
+#define MTK_DP_LANE1_DRIVING_PARAM_8		(PHY_OFFSET + 0x24C)
+#define MTK_DP_LANE2_DRIVING_PARAM_8		(PHY_OFFSET + 0x34C)
+#define MTK_DP_LANE3_DRIVING_PARAM_8		(PHY_OFFSET + 0x44C)
+# define XTP_LN_TX_LCTXCP1_SW2_PRE1_DEFAULT	0x08
+# define XTP_LN_TX_LCTXCP1_SW3_PRE0_DEFAULT	(0x00 << 8)
+# define DRIVING_PARAM_8_DEFAULT		(XTP_LN_TX_LCTXCP1_SW2_PRE1_DEFAULT | \
+						 XTP_LN_TX_LCTXCP1_SW3_PRE0_DEFAULT)
+
+struct mtk_dp_phy {
+	struct regmap *regs;
+};
+
+static int mtk_dp_phy_init(struct phy *phy)
+{
+	struct mtk_dp_phy *dp_phy = phy_get_drvdata(phy);
+	u32 driving_params[] = {
+		DRIVING_PARAM_3_DEFAULT,
+		DRIVING_PARAM_4_DEFAULT,
+		DRIVING_PARAM_5_DEFAULT,
+		DRIVING_PARAM_6_DEFAULT,
+		DRIVING_PARAM_7_DEFAULT,
+		DRIVING_PARAM_8_DEFAULT
+	};
+
+	regmap_bulk_write(dp_phy->regs, MTK_DP_LANE0_DRIVING_PARAM_3,
+			  driving_params, ARRAY_SIZE(driving_params));
+	regmap_bulk_write(dp_phy->regs, MTK_DP_LANE1_DRIVING_PARAM_3,
+			  driving_params, ARRAY_SIZE(driving_params));
+	regmap_bulk_write(dp_phy->regs, MTK_DP_LANE2_DRIVING_PARAM_3,
+			  driving_params, ARRAY_SIZE(driving_params));
+	regmap_bulk_write(dp_phy->regs, MTK_DP_LANE3_DRIVING_PARAM_3,
+			  driving_params, ARRAY_SIZE(driving_params));
+
+	return 0;
+}
+
+static int mtk_dp_phy_configure(struct phy *phy, union phy_configure_opts *opts)
+{
+	struct mtk_dp_phy *dp_phy = phy_get_drvdata(phy);
+	u32 val;
+
+	if (opts->dp.set_rate) {
+		switch (opts->dp.link_rate) {
+		default:
+			dev_err(&phy->dev,
+				"Implementation error, unknown linkrate %x\n",
+				opts->dp.link_rate);
+			return -EINVAL;
+		case 1620:
+			val = BIT_RATE_RBR;
+			break;
+		case 2700:
+			val = BIT_RATE_HBR;
+			break;
+		case 5400:
+			val = BIT_RATE_HBR2;
+			break;
+		case 8100:
+			val = BIT_RATE_HBR3;
+			break;
+		}
+		regmap_write(dp_phy->regs, MTK_DP_PHY_DIG_BIT_RATE, val);
+	}
+
+	regmap_update_bits(dp_phy->regs, MTK_DP_PHY_DIG_BIT_RATE,
+			   TPLL_SSC_EN, opts->dp.ssc ? TPLL_SSC_EN : 0);
+
+	return 0;
+}
+
+static int mtk_dp_phy_reset(struct phy *phy)
+{
+	struct mtk_dp_phy *dp_phy = phy_get_drvdata(phy);
+
+	regmap_update_bits(dp_phy->regs, MTK_DP_PHY_DIG_SW_RST,
+			   DP_GLB_SW_RST_PHYD, 0);
+	usleep_range(50, 200);
+	regmap_update_bits(dp_phy->regs, MTK_DP_PHY_DIG_SW_RST,
+			   DP_GLB_SW_RST_PHYD, 1);
+
+	return 0;
+}
+
+static const struct phy_ops mtk_dp_phy_dev_ops = {
+	.init = mtk_dp_phy_init,
+	.configure = mtk_dp_phy_configure,
+	.reset = mtk_dp_phy_reset,
+	.owner = THIS_MODULE,
+};
+
+static int mtk_dp_phy_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct mtk_dp_phy *dp_phy;
+	struct phy *phy;
+
+	dp_phy = devm_kzalloc(dev, sizeof(*dp_phy), GFP_KERNEL);
+	if (!dp_phy)
+		return -ENOMEM;
+
+	dp_phy->regs = *(struct regmap **)dev->platform_data;
+	if (!dp_phy->regs) {
+		dev_err(dev, "No data passed, requires struct regmap**\n");
+		return -EINVAL;
+	}
+
+	phy = devm_phy_create(dev, NULL, &mtk_dp_phy_dev_ops);
+	if (IS_ERR(phy)) {
+		dev_err(dev, "Failed to create DP PHY: %ld\n", PTR_ERR(phy));
+		return PTR_ERR(phy);
+	}
+	phy_set_drvdata(phy, dp_phy);
+
+	// Set device data to the phy so that mtk-dp can get it easily
+	dev_set_drvdata(dev, phy);
+
+	return 0;
+}
+
+struct platform_driver mtk_dp_phy_driver = {
+	.probe = mtk_dp_phy_probe,
+	.driver = {
+		.name = "mediatek-dp-phy",
+	},
+};
+module_platform_driver(mtk_dp_phy_driver);
+
+MODULE_DESCRIPTION("MediaTek DP PHY Driver");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/soc/mediatek/mtk-mmsys.h b/include/linux/soc/mediatek/mtk-mmsys.h
index 2228bf6133da..920e19968f38 100644
--- a/include/linux/soc/mediatek/mtk-mmsys.h
+++ b/include/linux/soc/mediatek/mtk-mmsys.h
@@ -19,6 +19,8 @@ enum mtk_ddp_comp_id {
 	DDP_COMPONENT_DITHER,
 	DDP_COMPONENT_DPI0,
 	DDP_COMPONENT_DPI1,
+	DDP_COMPONENT_DP_INTF0,
+	DDP_COMPONENT_DP_INTF1,
 	DDP_COMPONENT_DSI0,
 	DDP_COMPONENT_DSI1,
 	DDP_COMPONENT_DSI2,