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From: Bo-Chen Chen <rex-bc.chen@mediatek.com>
To: <chunkuang.hu@kernel.org>, <p.zabel@pengutronix.de>, <daniel@ffwll.ch>,
 <robh+dt@kernel.org>, <krzysztof.kozlowski+dt@linaro.org>,
 <mripard@kernel.org>, <tzimmermann@suse.de>, <matthias.bgg@gmail.com>,
 <deller@gmx.de>, <airlied@linux.ie>
Subject: [PATCH v12 05/10] drm/mediatek: Add MT8195 Embedded DisplayPort
 driver
Date: Mon, 27 Jun 2022 16:03:36 +0800
Message-ID: <20220627080341.5087-6-rex-bc.chen@mediatek.com>
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Cc: devicetree@vger.kernel.org, linux-fbdev@vger.kernel.org,
 granquet@baylibre.com, jitao.shi@mediatek.com, linux-kernel@vger.kernel.org,
 dri-devel@lists.freedesktop.org, msp@baylibre.com,
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 angelogioacchino.delregno@collabora.com
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From: Markus Schneider-Pargmann <msp@baylibre.com>

This patch adds a embedded displayport driver for the MediaTek mt8195 SoC.

It supports the MT8195, the embedded DisplayPort units. It offers
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
Jitao shi <jitao.shi@mediatek.com>

Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
[Bo-Chen: Cleanup the drivers and modify comments from reviewers]
Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com>
---
 drivers/gpu/drm/mediatek/Kconfig       |   10 +
 drivers/gpu/drm/mediatek/Makefile      |    1 +
 drivers/gpu/drm/mediatek/mtk_dp.c      | 2198 ++++++++++++++++++++++++
 drivers/gpu/drm/mediatek/mtk_dp_reg.h  |  543 ++++++
 drivers/gpu/drm/mediatek/mtk_drm_drv.c |    3 +
 drivers/gpu/drm/mediatek/mtk_drm_drv.h |    3 +
 6 files changed, 2758 insertions(+)
 create mode 100644 drivers/gpu/drm/mediatek/mtk_dp.c
 create mode 100644 drivers/gpu/drm/mediatek/mtk_dp_reg.h

diff --git a/drivers/gpu/drm/mediatek/Kconfig b/drivers/gpu/drm/mediatek/Kconfig
index 2976d21e9a34..6d3af73e7e8c 100644
--- a/drivers/gpu/drm/mediatek/Kconfig
+++ b/drivers/gpu/drm/mediatek/Kconfig
@@ -15,12 +15,22 @@ config DRM_MEDIATEK
 	select MTK_SMI
 	select PHY_MTK_MIPI_DSI
 	select VIDEOMODE_HELPERS
+	select DRM_MEDIATEK_DP
 	help
 	  Choose this option if you have a Mediatek SoCs.
 	  The module will be called mediatek-drm
 	  This driver provides kernel mode setting and
 	  buffer management to userspace.
 
+config DRM_MEDIATEK_DP
+	tristate "DRM DPTX Support for MediaTek SoCs"
+	depends on DRM_MEDIATEK
+	select PHY_MTK_DP
+	select DRM_DISPLAY_HELPER
+	select DRM_DISPLAY_DP_HELPER
+	help
+	  DRM/KMS Display Port driver for MediaTek SoCs.
+
 config DRM_MEDIATEK_HDMI
 	tristate "DRM HDMI Support for Mediatek SoCs"
 	depends on DRM_MEDIATEK
diff --git a/drivers/gpu/drm/mediatek/Makefile b/drivers/gpu/drm/mediatek/Makefile
index 3abd27d7c91d..4871abecbf49 100644
--- a/drivers/gpu/drm/mediatek/Makefile
+++ b/drivers/gpu/drm/mediatek/Makefile
@@ -14,6 +14,7 @@ mediatek-drm-y := mtk_disp_aal.o \
 		  mtk_drm_gem.o \
 		  mtk_drm_plane.o \
 		  mtk_dsi.o \
+		  mtk_dp.o \
 		  mtk_dpi.o \
 		  mtk_ethdr.o \
 		  mtk_mdp_rdma.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..9e9b516409e2
--- /dev/null
+++ b/drivers/gpu/drm/mediatek/mtk_dp.c
@@ -0,0 +1,2198 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2019-2022 MediaTek Inc.
+ * Copyright (c) 2022 BayLibre
+ */
+
+#include <drm/display/drm_dp.h>
+#include <drm/display/drm_dp_helper.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_crtc.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/nvmem-consumer.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_SIP_CONTROL_AARCH32 0x82000523
+
+#define MTK_VDOSYS1_MAX_FRAMERATE 60
+#define MTK_DP_4P1T 4
+#define MTK_DP_HDE 2
+#define MTK_DP_PIX_PER_ADDR 2
+#define MTK_DP_AUX_WAIT_REPLY_COUNT 20
+#define MTK_DP_CHECK_SINK_CAP_TIMEOUT_COUNT 3
+#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_DP_VERSION_11 0x11
+
+enum mtk_dp_train_state {
+	MTK_DP_TRAIN_STATE_TRAINING,
+	MTK_DP_TRAIN_STATE_NORMAL,
+};
+
+struct mtk_dp_timings {
+	struct videomode vm;
+	u8 frame_rate;
+};
+
+struct mtk_dp_irq_sta {
+	bool hpd_disconnect;
+	bool hpd_inerrupt;
+};
+
+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;
+	struct mtk_dp_irq_sta irq_sta;
+};
+
+struct mtk_dp_info {
+	u32 depth;
+	enum dp_pixelformat format;
+	struct mtk_dp_timings timings;
+};
+
+struct dp_cal_data {
+	unsigned int glb_bias_trim;
+	unsigned int clktx_impse;
+
+	unsigned int ln_tx_impsel_pmos[4];
+	unsigned int ln_tx_impsel_nmos[4];
+};
+
+struct mtk_dp {
+	struct device *dev;
+	struct platform_device *phy_dev;
+	struct phy *phy;
+	struct dp_cal_data cal_data;
+	u8 max_lanes;
+	u8 max_linkrate;
+
+	struct drm_device *drm_dev;
+	struct drm_bridge bridge;
+	struct drm_bridge *next_bridge;
+	struct drm_dp_aux aux;
+
+	u8 rx_cap[DP_RECEIVER_CAP_SIZE];
+
+	struct mtk_dp_info info;
+
+	struct mtk_dp_train_info train_info;
+	enum mtk_dp_train_state train_state;
+
+	struct regmap *regs;
+
+	bool enabled;
+
+	struct drm_connector *conn;
+};
+
+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 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)
+{
+	if (regmap_write(mtk_dp->regs, offset, val))
+		dev_err(mtk_dp->dev,
+			"Failed to write register 0x%x with value 0x%x\n",
+			offset, val);
+}
+
+static void mtk_dp_update_bits(struct mtk_dp *mtk_dp, u32 offset,
+			       u32 val, u32 mask)
+{
+	if (regmap_update_bits(mtk_dp->regs, offset, mask, val))
+		dev_err(mtk_dp->dev,
+			"Failed to update register 0x%x with value 0x%x, mask 0x%x\n",
+			offset, val, mask);
+}
+
+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(struct mtk_dp *mtk_dp,
+					 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);
+
+	dev_dbg(mtk_dp->dev, "sip cmd 0x%x, p1 0x%x, ret 0x%lx-0x%lx",
+		cmd, para, res.a0, res.a1);
+
+	return res.a1;
+}
+
+static void mtk_dp_msa_bypass_disable(struct mtk_dp *mtk_dp)
+{
+	u16 val = 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, val, val);
+}
+
+static void mtk_dp_set_msa(struct mtk_dp *mtk_dp)
+{
+	struct drm_display_mode mode;
+	struct mtk_dp_timings *timings = &mtk_dp->info.timings;
+
+	drm_display_mode_from_videomode(&timings->vm, &mode);
+
+	/* horizontal */
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3010,
+			   mode.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);
+
+	/* vertical */
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3014,
+			   mode.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);
+
+	/* horizontal */
+	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,
+			   mode.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);
+
+	/* vertical */
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3168,
+			   mode.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 dp_pixelformat 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 DP_PIXELFORMAT_YUV422:
+		val = PIXEL_ENCODE_FORMAT_DP_ENC0_P0_YCBCR422;
+		break;
+	case DP_PIXELFORMAT_YUV420:
+		val = PIXEL_ENCODE_FORMAT_DP_ENC0_P0_YCBCR420;
+		break;
+	case DP_PIXELFORMAT_RGB:
+	case DP_PIXELFORMAT_YUV444:
+		val = PIXEL_ENCODE_FORMAT_DP_ENC0_P0_RGB;
+		break;
+	case DP_PIXELFORMAT_Y_ONLY:
+	case DP_PIXELFORMAT_RAW:
+	case DP_PIXELFORMAT_RESERVED:
+	default:
+		drm_warn(mtk_dp->drm_dev, "Unsupported color format: %d\n",
+			 color_format);
+		return;
+	}
+
+	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)
+{
+	u32 val;
+	/* Only support 8 bits currently */
+	u32 color_depth = DP_MSA_MISC_8_BPC;
+
+	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_MASK);
+
+	switch (color_depth) {
+	case DP_MSA_MISC_6_BPC:
+		val = VIDEO_COLOR_DEPTH_DP_ENC0_P0_6BIT;
+		break;
+	case DP_MSA_MISC_8_BPC:
+		val = VIDEO_COLOR_DEPTH_DP_ENC0_P0_8BIT;
+		break;
+	case DP_MSA_MISC_10_BPC:
+		val = VIDEO_COLOR_DEPTH_DP_ENC0_P0_10BIT;
+		break;
+	case DP_MSA_MISC_12_BPC:
+		val = VIDEO_COLOR_DEPTH_DP_ENC0_P0_12BIT;
+		break;
+	case DP_MSA_MISC_16_BPC:
+		val = VIDEO_COLOR_DEPTH_DP_ENC0_P0_16BIT;
+		break;
+	default:
+		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);
+	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);
+	mtk_dp_write(mtk_dp, MTK_DP_ENC1_P0_3368,
+		     BIT(VIDEO_SRAM_FIFO_CNT_RESET_SEL_DP_ENC1_P0_SHIFT) |
+		     BIT(VIDEO_STABLE_CNT_THRD_DP_ENC1_P0_SHIFT) |
+		     BIT(SDP_DP13_EN_DP_ENC1_P0_SHIFT) |
+		     BIT(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);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_31B0,
+			   4 << PGEN_PATTERN_SEL_SHIFT, PGEN_PATTERN_SEL_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_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);
+
+		/* Hardware needs time to update the data */
+		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;
+
+		/* Give the hardware a chance to reach completion before retrying */
+		usleep_range(100, 500);
+	}
+
+	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);
+
+	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");
+			return -EIO;
+		}
+
+		mtk_dp_aux_cmd_complete(mtk_dp);
+		mtk_dp_aux_irq_clear(mtk_dp);
+
+		return -ETIMEDOUT;
+	}
+
+	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);
+
+	return 0;
+}
+
+static void 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;
+
+	dev_dbg(mtk_dp->dev,
+		"link training: swing_val = 0x%x, pre-emphasis = 0x%x\n",
+		swing_val, preemphasis);
+
+	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);
+}
+
+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 u32 mtk_dp_swirq_get_clear(struct mtk_dp *mtk_dp)
+{
+	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)
+{
+	u32 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)
+{
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3418,
+			   enable ? 0 :
+			   IRQ_MASK_DP_TRANS_P0_DISC_IRQ |
+			   IRQ_MASK_DP_TRANS_P0_CONN_IRQ |
+			   IRQ_MASK_DP_TRANS_P0_INT_IRQ,
+			   IRQ_MASK_DP_TRANS_P0_MASK);
+}
+
+static void mtk_dp_initialize_settings(struct mtk_dp *mtk_dp)
+{
+	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)
+{
+	u32 val;
+	/* 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);
+
+	val = (HPD_INT_THD_DP_TRANS_P0_LOWER_500US |
+	       HPD_INT_THD_DP_TRANS_P0_UPPER_1100US)
+	      << HPD_INT_THD_DP_TRANS_P0_SHIFT;
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3410,
+			   val, 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
+	 */
+	val = (5 << HPD_DISC_THD_DP_TRANS_P0_SHIFT) |
+	      (5 << HPD_CONN_THD_DP_TRANS_P0_SHIFT);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3410,
+			   val,
+			   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 = 0x1595 */
+	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, DP_PIXELFORMAT_RGB);
+	mtk_dp_set_color_depth(mtk_dp);
+
+	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);
+
+	/* Wait for sw reset to complete */
+	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);
+
+	/* Wait for sw reset to complete */
+	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)
+{
+	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, u32 linkrate)
+{
+	switch (linkrate) {
+	case DP_LINK_BW_1_62:
+		return 1620;
+	case DP_LINK_BW_2_7:
+		return 2700;
+	case DP_LINK_BW_5_4:
+		return 5400;
+	case DP_LINK_BW_8_1:
+		return 8100;
+	default:
+		drm_err(mtk_dp->drm_dev,
+			"Implementation error, unknown linkrate %d\n",
+			linkrate);
+		return -EINVAL;
+	}
+}
+
+static void use_cal_default_val(struct mtk_dp *mtk_dp)
+{
+	struct dp_cal_data *cal_data = &mtk_dp->cal_data;
+	int i;
+
+	dev_warn(mtk_dp->dev, "Use default calibration data\n");
+
+	cal_data->glb_bias_trim = 0xf;
+	cal_data->clktx_impse = 0x8;
+
+	for (i = 0; i < 4; i++) {
+		cal_data->ln_tx_impsel_pmos[i] = 0x8;
+		cal_data->ln_tx_impsel_nmos[i] = 0x8;
+	}
+}
+
+static u32 check_cal_data_valid(struct mtk_dp *mtk_dp, u32 min, u32 max,
+				u32 val, u32 default_val)
+{
+	if (val < min || val > max) {
+		dev_warn(mtk_dp->dev,
+			 "invalid calibration data: %d, use value: %d\n",
+			 val, default_val);
+		return default_val;
+	}
+
+	return val;
+}
+
+static void mtk_dp_get_calibration_data(struct mtk_dp *mtk_dp)
+{
+	struct dp_cal_data *cal_data = &mtk_dp->cal_data;
+	struct device *dev = mtk_dp->dev;
+	struct nvmem_cell *cell;
+	u32 *buf;
+	size_t len;
+
+	cell = nvmem_cell_get(dev, "dp_calibration_data");
+	if (IS_ERR(cell)) {
+		dev_warn(dev,
+			 "Error: Failed to get nvmem cell dp_calibration_data\n");
+		use_cal_default_val(mtk_dp);
+		return;
+	}
+
+	buf = (u32 *)nvmem_cell_read(cell, &len);
+	nvmem_cell_put(cell);
+
+	if (IS_ERR(buf) || ((len / sizeof(u32)) != 4)) {
+		dev_warn(dev, "Failed to read nvmem_cell_read\n");
+		use_cal_default_val(mtk_dp);
+		return;
+	}
+
+	cal_data->glb_bias_trim =
+		check_cal_data_valid(mtk_dp, 1, 0x1e,
+				     (buf[3] >> 27) & 0x1f, 0xf);
+	cal_data->clktx_impse =
+		check_cal_data_valid(mtk_dp, 1, 0xe,
+				     (buf[0] >> 9) & 0xf, 0x8);
+	cal_data->ln_tx_impsel_pmos[0] =
+		check_cal_data_valid(mtk_dp, 1, 0xe,
+				     (buf[2] >> 28) & 0xf, 0x8);
+	cal_data->ln_tx_impsel_nmos[0] =
+		check_cal_data_valid(mtk_dp, 1, 0xe,
+				     (buf[2] >> 24) & 0xf, 0x8);
+	cal_data->ln_tx_impsel_pmos[1] =
+		check_cal_data_valid(mtk_dp, 1, 0xe,
+				     (buf[2] >> 20) & 0xf, 0x8);
+	cal_data->ln_tx_impsel_nmos[1] =
+		check_cal_data_valid(mtk_dp, 1, 0xe,
+				     (buf[2] >> 16) & 0xf, 0x8);
+	cal_data->ln_tx_impsel_pmos[2] =
+		check_cal_data_valid(mtk_dp, 1, 0xe,
+				     (buf[2] >> 12) & 0xf, 0x8);
+	cal_data->ln_tx_impsel_nmos[2] =
+		check_cal_data_valid(mtk_dp, 1, 0xe,
+				     (buf[2] >> 8) & 0xf, 0x8);
+	cal_data->ln_tx_impsel_pmos[3] =
+		check_cal_data_valid(mtk_dp, 1, 0xe,
+				     (buf[2] >> 4) & 0xf, 0x8);
+	cal_data->ln_tx_impsel_nmos[3] =
+		check_cal_data_valid(mtk_dp, 1, 0xe, buf[2] & 0xf, 0x8);
+
+	kfree(buf);
+}
+
+static void mtk_dp_set_cal_data(struct mtk_dp *mtk_dp)
+{
+	struct dp_cal_data *cal_data = &mtk_dp->cal_data;
+
+	mtk_dp_update_bits(mtk_dp, DP_PHY_GLB_DPAUX_TX,
+			   cal_data->clktx_impse << 20, RG_CKM_PT0_CKTX_IMPSEL);
+	mtk_dp_update_bits(mtk_dp, DP_PHY_GLB_BIAS_GEN_00,
+			   cal_data->glb_bias_trim << 16,
+			   RG_XTP_GLB_BIAS_INTR_CTRL);
+	mtk_dp_update_bits(mtk_dp, DP_PHY_LANE_TX_0,
+			   cal_data->ln_tx_impsel_pmos[0] << 12,
+			   RG_XTP_LN0_TX_IMPSEL_PMOS);
+	mtk_dp_update_bits(mtk_dp, DP_PHY_LANE_TX_0,
+			   cal_data->ln_tx_impsel_nmos[0] << 16,
+			   RG_XTP_LN0_TX_IMPSEL_NMOS);
+	mtk_dp_update_bits(mtk_dp, DP_PHY_LANE_TX_1,
+			   cal_data->ln_tx_impsel_pmos[1] << 12,
+			   RG_XTP_LN1_TX_IMPSEL_PMOS);
+	mtk_dp_update_bits(mtk_dp, DP_PHY_LANE_TX_1,
+			   cal_data->ln_tx_impsel_nmos[1] << 16,
+			   RG_XTP_LN1_TX_IMPSEL_NMOS);
+	mtk_dp_update_bits(mtk_dp, DP_PHY_LANE_TX_2,
+			   cal_data->ln_tx_impsel_pmos[2] << 12,
+			   RG_XTP_LN2_TX_IMPSEL_PMOS);
+	mtk_dp_update_bits(mtk_dp, DP_PHY_LANE_TX_2,
+			   cal_data->ln_tx_impsel_nmos[2] << 16,
+			   RG_XTP_LN2_TX_IMPSEL_NMOS);
+	mtk_dp_update_bits(mtk_dp, DP_PHY_LANE_TX_3,
+			   cal_data->ln_tx_impsel_pmos[3] << 12,
+			   RG_XTP_LN3_TX_IMPSEL_PMOS);
+	mtk_dp_update_bits(mtk_dp, DP_PHY_LANE_TX_3,
+			   cal_data->ln_tx_impsel_nmos[3] << 16,
+			   RG_XTP_LN3_TX_IMPSEL_NMOS);
+}
+
+static int mtk_dp_phy_configure(struct mtk_dp *mtk_dp,
+				u32 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);
+
+	if (ret)
+		return ret;
+
+	mtk_dp_set_cal_data(mtk_dp);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
+			   DP_PWR_STATE_BANDGAP_TPLL_LANE, DP_PWR_STATE_MASK);
+
+	return 0;
+}
+
+static void mtk_dp_set_idle_pattern(struct mtk_dp *mtk_dp, bool enable)
+{
+	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)
+{
+	/* TPS1 */
+	if (pattern == 1)
+		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) |
+		  (enable ? BIT(VIDEO_MUTE_SW_DP_ENC0_P0_SHIFT) : 0);
+
+	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);
+
+	mtk_dp_sip_atf_call(mtk_dp, MTK_DP_SIP_ATF_EDP_VIDEO_UNMUTE, enable);
+}
+
+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);
+
+	/* Wait for power enable */
+	usleep_range(10, 200);
+
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_RESET_AND_PROBE,
+			   SW_RST_B_PHYD, SW_RST_B_PHYD);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
+			   DP_PWR_STATE_BANDGAP_TPLL, DP_PWR_STATE_MASK);
+}
+
+static void mtk_dp_power_disable(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_write(mtk_dp, MTK_DP_TOP_PWR_STATE, 0);
+
+	mtk_dp_write(mtk_dp, MTK_DP_0034,
+		     DA_CKM_CKTX0_EN_FORCE_EN |
+		     DA_CKM_BIAS_LPF_EN_FORCE_VAL |
+		     DA_CKM_BIAS_EN_FORCE_VAL |
+		     DA_XTP_GLB_LDO_EN_FORCE_VAL |
+		     DA_XTP_GLB_AVD10_ON_FORCE_VAL);
+
+	/* Disable RX */
+	mtk_dp_write(mtk_dp, MTK_DP_1040, 0);
+	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 = DP_LINK_BW_5_4;
+	mtk_dp->train_info.lane_count = mtk_dp->max_lanes;
+	mtk_dp->train_info.cable_plugged_in = false;
+	mtk_dp->train_info.cable_state_change = false;
+	memset(&mtk_dp->train_info.irq_sta, 0, sizeof(struct mtk_dp_irq_sta));
+
+	mtk_dp->train_state = MTK_DP_TRAIN_STATE_TRAINING;
+
+	mtk_dp->info.format = DP_PIXELFORMAT_RGB;
+	mtk_dp->info.depth = DP_MSA_MISC_8_BPC;
+	memset(&mtk_dp->info.timings, 0, sizeof(struct mtk_dp_timings));
+	mtk_dp->info.timings.frame_rate = 60;
+}
+
+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 /
+					MTK_DP_4P1T / MTK_DP_HDE / MTK_DP_PIX_PER_ADDR);
+		mtk_dp_set_sram_read_start(mtk_dp, sram_read_start);
+	}
+
+	mtk_dp_setup_encoder(mtk_dp);
+}
+
+static void mtk_dp_calculate_pixrate(struct mtk_dp *mtk_dp)
+{
+	u8 target_frame_rate = 60;
+	u32 target_pixel_clk;
+	struct drm_display_mode mode;
+	struct mtk_dp_timings *timings = &mtk_dp->info.timings;
+
+	drm_display_mode_from_videomode(&timings->vm, &mode);
+
+	if (mtk_dp->info.timings.frame_rate > 0) {
+		target_frame_rate = mtk_dp->info.timings.frame_rate;
+		target_pixel_clk = mode.htotal * mode.vtotal *
+				   target_frame_rate;
+	} else {
+		target_pixel_clk = mode.htotal * mode.vtotal *
+				   target_frame_rate;
+	}
+}
+
+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 ssize_t mtk_dp_hpd_sink_event(struct mtk_dp *mtk_dp)
+{
+	ssize_t ret;
+	u8 sink_count;
+	bool locked;
+	u8 link_status[DP_LINK_STATUS_SIZE] = {};
+	u32 sink_count_reg = DP_SINK_COUNT_ESI;
+	u32 link_status_reg = DP_LANE0_1_STATUS;
+
+	ret = drm_dp_dpcd_readb(&mtk_dp->aux, sink_count_reg, &sink_count);
+	if (ret < 0) {
+		drm_err(mtk_dp->drm_dev, "Read sink count failed\n");
+		return ret;
+	}
+
+	ret = drm_dp_dpcd_read(&mtk_dp->aux, link_status_reg, link_status,
+			       sizeof(link_status));
+	if (!ret) {
+		drm_err(mtk_dp->drm_dev, "Read link status failed\n");
+		return ret;
+	}
+
+	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)
+		mtk_dp->train_state = MTK_DP_TRAIN_STATE_TRAINING;
+
+	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->train_state = MTK_DP_TRAIN_STATE_TRAINING;
+		msleep(20);
+	}
+
+	return 0;
+}
+
+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);
+	}
+}
+
+static int mtk_dp_train_tps_1(struct mtk_dp *mtk_dp, u8 target_lane_count,
+			      int *iteration_count, u8 *lane_adjust,
+			      int *status_control, u8 *prev_lane_adjust)
+{
+	u8 val;
+	u8 link_status[DP_LINK_STATUS_SIZE] = {};
+
+	mtk_dp_training_set_scramble(mtk_dp, false);
+
+	if (*status_control == 0) {
+		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) * 2);
+
+		mtk_dp_train_update_swing_pre(mtk_dp,
+					      target_lane_count, lane_adjust);
+		*status_control = 1;
+		(*iteration_count)++;
+	}
+
+	drm_dp_link_train_clock_recovery_delay(&mtk_dp->aux, mtk_dp->rx_cap);
+	drm_dp_dpcd_read_link_status(&mtk_dp->aux, link_status);
+
+	if (drm_dp_clock_recovery_ok(link_status,
+				     target_lane_count)) {
+		mtk_dp->train_info.cr_done = true;
+		*iteration_count = 1;
+		dev_dbg(mtk_dp->dev, "Link train CR pass\n");
+		return 0;
+	} else if (*prev_lane_adjust == link_status[4]) {
+		(*iteration_count)++;
+		if (*prev_lane_adjust & DP_ADJUST_VOLTAGE_SWING_LANE0_MASK) {
+			dev_dbg(mtk_dp->dev, "Link train CQ fail\n");
+			return -EINVAL;
+		}
+	} else {
+		*prev_lane_adjust = link_status[4];
+	}
+	return -EAGAIN;
+}
+
+static int mtk_dp_train_tps_2_3(struct mtk_dp *mtk_dp, u8 target_linkrate,
+				u8 target_lane_count, int *iteration_count,
+				u8 *lane_adjust,  int *status_control,
+				u8 *prev_lane_adjust)
+{
+	u8 val;
+	u8 link_status[DP_LINK_STATUS_SIZE] = {};
+
+	if (*status_control == 1) {
+		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) * 2);
+
+		mtk_dp_train_update_swing_pre(mtk_dp,
+					      target_lane_count, lane_adjust);
+		*status_control = 2;
+		(*iteration_count)++;
+	}
+
+	drm_dp_link_train_channel_eq_delay(&mtk_dp->aux, mtk_dp->rx_cap);
+
+	drm_dp_dpcd_read_link_status(&mtk_dp->aux, 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;
+		dev_dbg(mtk_dp->dev, "Link train EQ fail\n");
+		return -EINVAL;
+	}
+
+	if (drm_dp_channel_eq_ok(link_status, target_lane_count)) {
+		mtk_dp->train_info.eq_done = true;
+		dev_dbg(mtk_dp->dev, "Link train EQ pass\n");
+		return 0;
+	}
+
+	if (*prev_lane_adjust == link_status[4])
+		(*iteration_count)++;
+	else
+		*prev_lane_adjust = link_status[4];
+
+	return -EAGAIN;
+}
+
+static int mtk_dp_train_flow(struct mtk_dp *mtk_dp, u8 target_link_rate,
+			     u8 target_lane_count)
+{
+	u8 lane_adjust[2] = {};
+	bool pass_tps1 = false;
+	bool pass_tps2_3 = false;
+	int train_retries;
+	int status_control;
+	int iteration_count;
+	int ret;
+	u8 prev_lane_adjust;
+
+	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);
+	ret = mtk_dp_phy_configure(mtk_dp, target_link_rate, target_lane_count);
+	if (ret)
+		return -EINVAL;
+
+	dev_dbg(mtk_dp->dev,
+		"Link train target_link_rate = 0x%x, target_lane_count = 0x%x\n",
+		target_link_rate, target_lane_count);
+
+	do {
+		train_retries++;
+		if (!mtk_dp->train_info.cable_plugged_in)
+			return -ENODEV;
+
+		if (!pass_tps1) {
+			ret = mtk_dp_train_tps_1(mtk_dp, target_lane_count,
+						 &iteration_count, lane_adjust,
+						 &status_control,
+						 &prev_lane_adjust);
+			if (!ret) {
+				pass_tps1 = true;
+				train_retries = 0;
+			} else if (ret == -EINVAL) {
+				break;
+			}
+		} else {
+			ret = mtk_dp_train_tps_2_3(mtk_dp, target_link_rate,
+						   target_lane_count,
+						   &iteration_count,
+						   lane_adjust, &status_control,
+						   &prev_lane_adjust);
+			if (!ret) {
+				pass_tps2_3 = true;
+				break;
+			} else if (ret == -EINVAL) {
+				break;
+			}
+		}
+
+		drm_dp_dpcd_read(&mtk_dp->aux, DP_ADJUST_REQUEST_LANE0_1,
+				 lane_adjust, sizeof(lane_adjust));
+		mtk_dp_train_update_swing_pre(mtk_dp, target_lane_count,
+					      lane_adjust);
+	} 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)
+		return -ETIMEDOUT;
+
+	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 ret;
+}
+
+static int mtk_dp_parse_capabilities(struct mtk_dp *mtk_dp)
+{
+	u8 val;
+	struct mtk_dp_train_info *train_info = &mtk_dp->train_info;
+
+	drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
+	usleep_range(2000, 5000);
+
+	drm_dp_read_dpcd_caps(&mtk_dp->aux, mtk_dp->rx_cap);
+
+	train_info->link_rate = min_t(int, mtk_dp->max_linkrate,
+				      drm_dp_max_link_rate(mtk_dp->rx_cap));
+	train_info->lane_count = min_t(int, mtk_dp->max_lanes,
+				       drm_dp_max_lane_count(mtk_dp->rx_cap));
+
+	train_info->tps3 = drm_dp_tps3_supported(mtk_dp->rx_cap);
+	train_info->tps4 = drm_dp_tps4_supported(mtk_dp->rx_cap);
+
+	train_info->sink_ssc = drm_dp_max_downspread(mtk_dp->rx_cap);
+
+	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 0;
+}
+
+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);
+}
+
+static int mtk_dp_train_start(struct mtk_dp *mtk_dp)
+{
+	int ret = 0;
+	u8 lane_count;
+	u8 link_rate;
+	u8 train_limit;
+	u8 max_link_rate;
+
+	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_linkrate, 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 DP_LINK_BW_1_62:
+	case DP_LINK_BW_2_7:
+	case DP_LINK_BW_5_4:
+	case DP_LINK_BW_8_1:
+		break;
+	default:
+		mtk_dp->train_info.link_rate = DP_LINK_BW_8_1;
+		break;
+	};
+
+	max_link_rate = link_rate;
+	for (train_limit = 6; train_limit > 0; 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 == -EINVAL || ret == -ENODEV)
+			return ret;
+
+		if (!mtk_dp->train_info.cr_done) {
+			switch (link_rate) {
+			case DP_LINK_BW_1_62:
+				lane_count = lane_count / 2;
+				link_rate = max_link_rate;
+				if (lane_count == 0)
+					return -EIO;
+				break;
+			case DP_LINK_BW_2_7:
+				link_rate = DP_LINK_BW_1_62;
+				break;
+			case DP_LINK_BW_5_4:
+				link_rate = DP_LINK_BW_2_7;
+				break;
+			case DP_LINK_BW_8_1:
+				link_rate = DP_LINK_BW_5_4;
+				break;
+			default:
+				return -EINVAL;
+			};
+		} else if (!mtk_dp->train_info.eq_done) {
+			if (lane_count == 0)
+				return -EIO;
+
+			lane_count /= 2;
+		} else {
+			break;
+		}
+	}
+
+	if (train_limit == 0)
+		return -ETIMEDOUT;
+
+	return 0;
+}
+
+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_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_set_color_format(mtk_dp, mtk_dp->info.format);
+}
+
+static int mtk_dp_training(struct mtk_dp *mtk_dp)
+{
+	bool training_done = false;
+	short max_retry = 50;
+	int ret = 0;
+
+	do {
+		switch (mtk_dp->train_state) {
+		case MTK_DP_TRAIN_STATE_TRAINING:
+			ret = mtk_dp_train_start(mtk_dp);
+			if (!ret)
+				mtk_dp->train_state = MTK_DP_TRAIN_STATE_NORMAL;
+			break;
+		case MTK_DP_TRAIN_STATE_NORMAL:
+			mtk_dp_video_config(mtk_dp);
+			mtk_dp_video_enable(mtk_dp, true);
+			training_done = true;
+			break;
+		default:
+			break;
+		}
+
+		if (ret) {
+			if (ret == -EAGAIN)
+				continue;
+			/*
+			 * If we get any other error number, it doesn't
+			 * make any sense to keep iterating.
+			 */
+			break;
+		}
+	} while (!training_done || --max_retry);
+
+	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;
+	u8 buf[DP_RECEIVER_CAP_SIZE] = {};
+
+	if (mtk_dp->train_info.cable_state_change) {
+		mtk_dp->train_info.cable_state_change = false;
+
+		mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
+				   DP_PWR_STATE_BANDGAP_TPLL_LANE,
+				   DP_PWR_STATE_MASK);
+		drm_dp_read_dpcd_caps(&mtk_dp->aux, buf);
+		mtk_dp->train_info.link_rate =
+			min_t(int, mtk_dp->max_linkrate,
+			      buf[mtk_dp->max_linkrate]);
+		mtk_dp->train_info.lane_count =
+			min_t(int, mtk_dp->max_lanes,
+			      drm_dp_max_lane_count(buf));
+	}
+
+	if (mtk_dp->train_info.irq_sta.hpd_inerrupt) {
+		dev_dbg(mtk_dp->dev, "MTK_DP_HPD_INTERRUPT\n");
+		mtk_dp->train_info.irq_sta.hpd_inerrupt = false;
+		mtk_dp_hpd_sink_event(mtk_dp);
+	}
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * We need to handle HPD signal in eDP even though eDP is a always connected
+ * device. Besides connected status, there is another feature for HPD signal -
+ * HPD pulse: it presents an IRQ from sink devices to source devices (Refer to
+ * 5.1.4 of DP1.4 spec).
+ */
+static irqreturn_t mtk_dp_hpd_isr_handler(struct mtk_dp *mtk_dp)
+{
+	bool connected;
+	bool hpd_connect_sta;
+	u32 irq_status = mtk_dp_swirq_get_clear(mtk_dp) |
+			 mtk_dp_hwirq_get_clear(mtk_dp);
+	struct mtk_dp_train_info *train_info = &mtk_dp->train_info;
+
+	if (irq_status & MTK_DP_HPD_INTERRUPT)
+		train_info->irq_sta.hpd_inerrupt = true;
+	if (irq_status & MTK_DP_HPD_CONNECT)
+		hpd_connect_sta = true;
+	if (irq_status & MTK_DP_HPD_DISCONNECT)
+		train_info->irq_sta.hpd_disconnect = true;
+
+	if (!irq_status)
+		return IRQ_HANDLED;
+
+	connected = mtk_dp_plug_state(mtk_dp);
+	if (connected || !train_info->cable_plugged_in)
+		train_info->irq_sta.hpd_disconnect  = false;
+	else if (!connected || train_info->cable_plugged_in)
+		hpd_connect_sta = false;
+
+	if (!(hpd_connect_sta || train_info->irq_sta.hpd_disconnect))
+		return IRQ_WAKE_THREAD;
+
+	if (hpd_connect_sta) {
+		hpd_connect_sta = false;
+		train_info->cable_plugged_in = true;
+	} else {
+		train_info->irq_sta.hpd_disconnect = false;
+		train_info->cable_plugged_in = false;
+		mtk_dp->train_state = MTK_DP_TRAIN_STATE_TRAINING;
+	}
+	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(struct mtk_dp *mtk_dp,
+			   struct platform_device *pdev)
+{
+	struct device_node *of_node = pdev->dev.of_node;
+	struct device *dev = &pdev->dev;
+	int ret = 0;
+	void __iomem *base;
+	u32 linkrate;
+	int len;
+
+	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);
+
+	len = of_property_count_elems_of_size(of_node,
+					      "data-lanes", sizeof(u32));
+	if (len < 0 || len > 4 || len == 3) {
+		dev_err(dev, "invalid data lane size: %d\n", len);
+		return -EINVAL;
+	}
+
+	mtk_dp->max_lanes = len;
+
+	ret = device_property_read_u32(dev, "max-linkrate-mhz", &linkrate);
+	if (ret) {
+		dev_err(dev, "failed to read max linkrate: %d\n", ret);
+		return ret;
+	}
+
+	switch (linkrate) {
+	case 8100: /* 8.1G */
+		mtk_dp->max_linkrate = DP_LINK_BW_8_1;
+		break;
+	case 5400: /* 5.4G */
+		mtk_dp->max_linkrate = DP_LINK_BW_5_4;
+		break;
+	case 2700: /* 2.7G */
+		mtk_dp->max_linkrate = DP_LINK_BW_2_7;
+		break;
+	case 1620: /* 1.62G */
+		mtk_dp->max_linkrate = DP_LINK_BW_1_62;
+		break;
+	default:
+		dev_err(dev, "invalid linkrate: %d\n", linkrate);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+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);
+
+	drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
+	usleep_range(2000, 5000);
+
+	new_edid = drm_get_edid(connector, &mtk_dp->aux.ddc);
+
+	if (!enabled)
+		drm_bridge_chain_post_disable(bridge);
+
+	return new_edid;
+}
+
+static ssize_t mtk_dp_aux_transfer(struct drm_dp_aux *mtk_aux,
+				   struct drm_dp_aux_msg *msg)
+{
+	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) {
+		ret = -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);
+		ret = -EINVAL;
+		goto err;
+	}
+
+	if (msg->size == 0) {
+		ret = mtk_dp_aux_do_transfer(mtk_dp, is_read, request,
+					     msg->address + accessed_bytes,
+					     msg->buffer + accessed_bytes, 0);
+	} else {
+		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);
+
+			if (ret) {
+				drm_info(mtk_dp->drm_dev,
+					 "Failed to do AUX transfer: %d\n", ret);
+				break;
+			}
+			accessed_bytes += to_access;
+		}
+	}
+err:
+	if (ret) {
+		msg->reply = DP_AUX_NATIVE_REPLY_NACK | DP_AUX_I2C_REPLY_NACK;
+		return ret;
+	}
+
+	msg->reply = DP_AUX_NATIVE_REPLY_ACK | DP_AUX_I2C_REPLY_ACK;
+	return msg->size;
+}
+
+static void mtk_dp_poweroff(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_hwirq_enable(mtk_dp, false);
+	mtk_dp_power_disable(mtk_dp);
+	phy_exit(mtk_dp->phy);
+}
+
+static int mtk_dp_poweron(struct mtk_dp *mtk_dp)
+{
+	int ret = 0;
+
+	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, DP_LINK_BW_1_62, 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);
+
+err_phy_config:
+	phy_exit(mtk_dp->phy);
+err_phy_init:
+	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;
+	}
+
+	mtk_dp->aux.drm_dev = bridge->dev;
+	ret = drm_dp_aux_register(&mtk_dp->aux);
+	if (ret) {
+		dev_err(mtk_dp->dev,
+			"failed to register DP AUX channel: %d\n", ret);
+		return ret;
+	}
+
+	ret = mtk_dp_poweron(mtk_dp);
+	if (ret)
+		goto err_aux_register;
+
+	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;
+		}
+
+		/* eDP is connected */
+		drm_helper_hpd_irq_event(mtk_dp->bridge.dev);
+	}
+
+	mtk_dp->drm_dev = bridge->dev;
+
+	mtk_dp_hwirq_enable(mtk_dp, true);
+
+	return 0;
+
+err_bridge_attach:
+	mtk_dp_poweroff(mtk_dp);
+err_aux_register:
+	drm_dp_aux_unregister(&mtk_dp->aux);
+	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;
+	drm_dp_aux_unregister(&mtk_dp->aux);
+	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_video_mute(mtk_dp, true);
+	mtk_dp->train_state = MTK_DP_TRAIN_STATE_TRAINING;
+
+	mtk_dp->enabled = false;
+	/* Ensure the sink is muted */
+	msleep(20);
+}
+
+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 = drm_mode_vrefresh(mode);
+}
+
+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);
+
+	mtk_dp->conn = drm_atomic_get_new_connector_for_encoder(old_state->base.state,
+								bridge->encoder);
+	if (!mtk_dp->conn) {
+		drm_err(mtk_dp->drm_dev,
+			"Can't enable bridge as connector is missing\n");
+		return;
+	}
+
+	mtk_dp_video_mute(mtk_dp, true);
+
+	if (mtk_dp_parse_capabilities(mtk_dp)) {
+		drm_err(mtk_dp->drm_dev, "Can't parse capabilities\n");
+		return;
+	}
+
+	/* Training */
+	if (mtk_dp_training(mtk_dp)) {
+		drm_err(mtk_dp->drm_dev, "Training failed\n");
+		return;
+	}
+
+	mtk_dp->enabled = true;
+}
+
+static enum drm_mode_status
+mtk_dp_bridge_mode_valid(struct drm_bridge *bridge,
+			 const struct drm_display_info *info,
+			 const struct drm_display_mode *mode)
+{
+	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
+	u32 rx_linkrate = (u32)mtk_dp->train_info.link_rate * 27000;
+	u32 bpp = info->color_formats & DRM_COLOR_FORMAT_YCBCR422 ? 16 : 24;
+
+	if (rx_linkrate * mtk_dp->train_info.lane_count < mode->clock * bpp / 8)
+		return MODE_CLOCK_HIGH;
+
+	if (mode->clock > 600000)
+		return MODE_CLOCK_HIGH;
+
+	if ((mode->clock * 1000) / (mode->htotal * mode->vtotal) >
+	    MTK_VDOSYS1_MAX_FRAMERATE)
+		return MODE_CLOCK_HIGH;
+
+	return MODE_OK;
+}
+
+static u32 *mtk_dp_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
+						     struct drm_bridge_state *bridge_state,
+						     struct drm_crtc_state *crtc_state,
+						     struct drm_connector_state *conn_state,
+						     unsigned int *num_output_fmts)
+{
+	u32 *output_fmts;
+
+	*num_output_fmts = 0;
+	output_fmts = kmalloc(sizeof(*output_fmts), GFP_KERNEL);
+	if (!output_fmts)
+		return NULL;
+	*num_output_fmts = 1;
+	output_fmts[0] = MEDIA_BUS_FMT_FIXED;
+	return output_fmts;
+}
+
+static const u32 mt8195_input_fmts[] = {
+	MEDIA_BUS_FMT_RGB888_1X24,
+	MEDIA_BUS_FMT_YUV8_1X24,
+	MEDIA_BUS_FMT_YUYV8_1X16,
+};
+
+static u32 *mtk_dp_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
+						    struct drm_bridge_state *bridge_state,
+						    struct drm_crtc_state *crtc_state,
+						    struct drm_connector_state *conn_state,
+						    u32 output_fmt,
+						    unsigned int *num_input_fmts)
+{
+	u32 *input_fmts;
+	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
+	struct drm_display_mode *mode = &crtc_state->adjusted_mode;
+	struct drm_display_info *display_info =
+		&conn_state->connector->display_info;
+	u32 rx_linkrate = (u32)mtk_dp->train_info.link_rate * 27000;
+
+	*num_input_fmts = 0;
+
+	if (((rx_linkrate * mtk_dp->train_info.lane_count) <
+	     (mode->clock * 24 / 8)) &&
+	    ((rx_linkrate * mtk_dp->train_info.lane_count) >
+	     (mode->clock * 16 / 8)) &&
+	    (display_info->color_formats & DRM_COLOR_FORMAT_YCBCR422)) {
+		input_fmts = kcalloc(1, sizeof(*input_fmts), GFP_KERNEL);
+		if (!input_fmts)
+			return NULL;
+		*num_input_fmts = 1;
+		input_fmts[0] = MEDIA_BUS_FMT_YUYV8_1X16;
+	} else {
+		input_fmts = kcalloc(ARRAY_SIZE(mt8195_input_fmts),
+				     sizeof(*input_fmts),
+				     GFP_KERNEL);
+		if (!input_fmts)
+			return NULL;
+
+		*num_input_fmts = ARRAY_SIZE(mt8195_input_fmts);
+		memcpy(input_fmts, mt8195_input_fmts, sizeof(mt8195_input_fmts));
+	}
+
+	return input_fmts;
+}
+
+static int mtk_dp_bridge_atomic_check(struct drm_bridge *bridge,
+				      struct drm_bridge_state *bridge_state,
+				      struct drm_crtc_state *crtc_state,
+				      struct drm_connector_state *conn_state)
+{
+	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
+	struct drm_crtc *crtc = conn_state->crtc;
+	unsigned int input_bus_format;
+
+	input_bus_format = bridge_state->input_bus_cfg.format;
+
+	dev_dbg(mtk_dp->dev, "input format 0x%04x, output format 0x%04x\n",
+		bridge_state->input_bus_cfg.format,
+		 bridge_state->output_bus_cfg.format);
+
+	if (input_bus_format == MEDIA_BUS_FMT_YUYV8_1X16)
+		mtk_dp->info.format = DP_PIXELFORMAT_YUV422;
+	else
+		mtk_dp->info.format = DP_PIXELFORMAT_RGB;
+
+	if (!crtc) {
+		drm_err(mtk_dp->drm_dev,
+			"Can't enable bridge as connector state doesn't have a crtc\n");
+		return -EINVAL;
+	}
+
+	mtk_dp_parse_drm_mode_timings(mtk_dp, &crtc_state->adjusted_mode);
+	if (mtk_dp_parse_capabilities(mtk_dp)) {
+		drm_err(mtk_dp->drm_dev,
+			"Can't enable bridge as nothing is plugged in\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static const struct drm_bridge_funcs mtk_dp_bridge_funcs = {
+	.atomic_check = mtk_dp_bridge_atomic_check,
+	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
+	.atomic_get_output_bus_fmts = mtk_dp_bridge_atomic_get_output_bus_fmts,
+	.atomic_get_input_bus_fmts = mtk_dp_bridge_atomic_get_input_bus_fmts,
+	.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,
+	.mode_valid = mtk_dp_bridge_mode_valid,
+	.get_edid = mtk_dp_get_edid,
+};
+
+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;
+
+	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)
+		return dev_err_probe(dev, irq_num,
+				     "failed to request dp irq resource\n");
+
+	mtk_dp->next_bridge = devm_drm_of_get_bridge(dev, dev->of_node, 1, 0);
+	if (IS_ERR(mtk_dp->next_bridge))
+		return dev_err_probe(dev, PTR_ERR(mtk_dp->next_bridge),
+				     "Failed to get bridge\n");
+
+	ret = mtk_dp_dt_parse(mtk_dp, pdev);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to parse dt\n");
+
+	drm_dp_aux_init(&mtk_dp->aux);
+	mtk_dp->aux.name = "aux_mtk_dp";
+	mtk_dp->aux.transfer = mtk_dp_aux_transfer;
+
+	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)
+		return dev_err_probe(dev, -EPROBE_DEFER,
+				     "failed to request mediatek dptx irq\n");
+
+	platform_set_drvdata(pdev, mtk_dp);
+
+	mtk_dp->phy_dev = platform_device_register_data(dev, "mediatek-dp-phy",
+							PLATFORM_DEVID_AUTO,
+							&mtk_dp->regs,
+							sizeof(struct regmap *));
+	if (IS_ERR(mtk_dp->phy_dev))
+		return dev_err_probe(dev, PTR_ERR(mtk_dp->phy_dev),
+				     "Failed to create device mediatek-dp-phy\n");
+
+	mtk_dp_get_calibration_data(mtk_dp);
+
+	mtk_dp->phy = devm_phy_get(&mtk_dp->phy_dev->dev, "dp");
+
+	if (IS_ERR(mtk_dp->phy)) {
+		platform_device_unregister(mtk_dp->phy_dev);
+		return dev_err_probe(dev, PTR_ERR(mtk_dp->phy),
+				     "Failed to get phy\n");
+	}
+
+	mtk_dp->bridge.funcs = &mtk_dp_bridge_funcs;
+	mtk_dp->bridge.of_node = dev->of_node;
+
+	mtk_dp->bridge.ops =
+		DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_HPD;
+	mtk_dp->bridge.type = DRM_MODE_CONNECTOR_eDP;
+
+	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);
+
+	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_hwirq_enable(mtk_dp, true);
+	mtk_dp_power_enable(mtk_dp);
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(mtk_dp_pm_ops, mtk_dp_suspend, mtk_dp_resume);
+
+static const struct of_device_id mtk_dp_of_match[] = {
+	{ .compatible = "mediatek,mt8195-edp-tx" },
+	{},
+};
+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,
+	},
+};
+
+MODULE_AUTHOR("Jitao Shi <jitao.shi@mediatek.com>");
+MODULE_AUTHOR("Markus Schneider-Pargmann <msp@baylibre.com>");
+MODULE_DESCRIPTION("MediaTek DisplayPort Driver");
+MODULE_LICENSE("GPL");
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..8171e5b03264
--- /dev/null
+++ b/drivers/gpu/drm/mediatek/mtk_dp_reg.h
@@ -0,0 +1,543 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2019-2022 MediaTek Inc.
+ * Copyright (c) 2022 BayLibre
+ */
+#ifndef _MTK_DP_REG_H_
+#define _MTK_DP_REG_H_
+
+#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_SIP_ATF_VIDEO_UNMUTE	BIT(5)
+#define MTK_DP_SIP_ATF_EDP_VIDEO_UNMUTE	(BIT(0) | BIT(5))
+
+#define DP_PHY_GLB_BIAS_GEN_00		0
+#define RG_XTP_GLB_BIAS_INTR_CTRL	GENMASK(20, 16)
+
+#define DP_PHY_GLB_DPAUX_TX		0x8
+#define RG_CKM_PT0_CKTX_IMPSEL		GENMASK(23, 20)
+
+#define DP_PHY_LANE_TX_0		0x104
+#define RG_XTP_LN0_TX_IMPSEL_PMOS	GENMASK(15, 12)
+#define RG_XTP_LN0_TX_IMPSEL_NMOS	GENMASK(19, 16)
+
+#define DP_PHY_LANE_TX_1		0x204
+#define RG_XTP_LN1_TX_IMPSEL_PMOS	GENMASK(15, 12)
+#define RG_XTP_LN1_TX_IMPSEL_NMOS	GENMASK(19, 16)
+
+#define DP_PHY_LANE_TX_2		0x304
+#define RG_XTP_LN2_TX_IMPSEL_PMOS	GENMASK(15, 12)
+#define RG_XTP_LN2_TX_IMPSEL_NMOS	GENMASK(19, 16)
+
+#define DP_PHY_LANE_TX_3		0x404
+#define RG_XTP_LN3_TX_IMPSEL_PMOS	GENMASK(15, 12)
+#define RG_XTP_LN3_TX_IMPSEL_NMOS	GENMASK(19, 16)
+
+#define MTK_DP_HPD_DISCONNECT	BIT(1)
+#define MTK_DP_HPD_CONNECT	BIT(2)
+#define MTK_DP_HPD_INTERRUPT	BIT(3)
+
+#define MTK_DP_0034			0x34
+#define DA_XTP_GLB_CKDET_EN_FORCE_VAL	BIT(15)
+#define DA_XTP_GLB_CKDET_EN_FORCE_EN	BIT(14)
+#define DA_CKM_INTCKTX_EN_FORCE_VAL	BIT(13)
+#define DA_CKM_INTCKTX_EN_FORCE_EN	BIT(12)
+#define DA_CKM_CKTX0_EN_FORCE_VAL	BIT(11)
+#define DA_CKM_CKTX0_EN_FORCE_EN	BIT(10)
+#define DA_CKM_XTAL_CK_FORCE_VAL	BIT(9)
+#define DA_CKM_XTAL_CK_FORCE_EN		BIT(8)
+#define DA_CKM_BIAS_LPF_EN_FORCE_VAL	BIT(7)
+#define DA_CKM_BIAS_LPF_EN_FORCE_EN	BIT(6)
+#define DA_CKM_BIAS_EN_FORCE_VAL	BIT(5)
+#define DA_CKM_BIAS_EN_FORCE_EN		BIT(4)
+#define DA_XTP_GLB_AVD10_ON_FORCE_VAL	BIT(3)
+#define DA_XTP_GLB_AVD10_ON_FORCE	BIT(2)
+#define DA_XTP_GLB_LDO_EN_FORCE_VAL	BIT(1)
+#define DA_XTP_GLB_LDO_EN_FORCE_EN	BIT(0)
+
+#define MTK_DP_1040			0x1040
+#define RG_DPAUX_RX_VALID_DEGLITCH_EN	BIT(2)
+#define RG_XTP_GLB_CKDET_EN		BIT(1)
+#define RG_DPAUX_RX_EN			BIT(0)
+
+#define MTK_DP_ENC0_P0_3000			(ENC0_OFFSET + 0x00)
+#define LANE_NUM_DP_ENC0_P0_MASK		GENMASK(1, 0)
+#define VIDEO_MUTE_SW_DP_ENC0_P0_MASK		BIT(2)
+#define VIDEO_MUTE_SW_DP_ENC0_P0_SHIFT		BIT(1)
+#define VIDEO_MUTE_SEL_DP_ENC0_P0_MASK		BIT(3)
+#define VIDEO_MUTE_SEL_DP_ENC0_P0_SHIFT		GENMASK(1, 0)
+#define ENHANCED_FRAME_EN_DP_ENC0_P0_MASK	BIT(4)
+#define ENHANCED_FRAME_EN_DP_ENC0_P0_SHIFT	BIT(2)
+
+#define MTK_DP_ENC0_P0_3004				(ENC0_OFFSET + 0x04)
+#define VIDEO_M_CODE_SEL_DP_ENC0_P0_MASK		BIT(8)
+#define VIDEO_M_CODE_SEL_DP_ENC0_P0_SHIFT		BIT(3)
+#define DP_TX_ENCODER_4P_RESET_SW_DP_ENC0_P0_MASK	BIT(9)
+#define DP_TX_ENCODER_4P_RESET_SW_DP_ENC0_P0_SHIFT	(BIT(0) | BIT(3))
+
+#define MTK_DP_ENC0_P0_3008			(ENC0_OFFSET + 0x08)
+#define VIDEO_M_CODE_SW_0_DP_ENC0_P0_MASK	GENMASK(15, 0)
+
+#define MTK_DP_ENC0_P0_300C			(ENC0_OFFSET + 0x0C)
+#define VIDEO_M_CODE_SW_1_DP_ENC0_P0_MASK	GENMASK(7, 0)
+
+#define MTK_DP_ENC0_P0_3010		(ENC0_OFFSET + 0x10)
+#define HTOTAL_SW_DP_ENC0_P0_MASK	GENMASK(15, 0)
+
+#define MTK_DP_ENC0_P0_3014		(ENC0_OFFSET + 0x14)
+#define VTOTAL_SW_DP_ENC0_P0_MASK	GENMASK(15, 0)
+
+#define MTK_DP_ENC0_P0_3018		(ENC0_OFFSET + 0x18)
+#define HSTART_SW_DP_ENC0_P0_MASK	GENMASK(15, 0)
+
+#define MTK_DP_ENC0_P0_301C		(ENC0_OFFSET + 0x1C)
+#define VSTART_SW_DP_ENC0_P0_MASK	GENMASK(15, 0)
+
+#define MTK_DP_ENC0_P0_3020		(ENC0_OFFSET + 0x20)
+#define HWIDTH_SW_DP_ENC0_P0_MASK	GENMASK(15, 0)
+
+#define MTK_DP_ENC0_P0_3024		(ENC0_OFFSET + 0x24)
+#define VHEIGHT_SW_DP_ENC0_P0_MASK	GENMASK(15, 0)
+
+#define MTK_DP_ENC0_P0_3028	(ENC0_OFFSET + 0x28)
+#define HSW_SW_DP_ENC0_P0_MASK	GENMASK(14, 0)
+#define HSW_SW_DP_ENC0_P0_SHIFT	0
+#define HSP_SW_DP_ENC0_P0_MASK	BIT(15)
+
+#define MTK_DP_ENC0_P0_302C	(ENC0_OFFSET + 0x2C)
+#define VSW_SW_DP_ENC0_P0_MASK	GENMASK(14, 0)
+#define VSW_SW_DP_ENC0_P0_SHIFT	0
+#define VSP_SW_DP_ENC0_P0_MASK	BIT(15)
+
+#define MTK_DP_ENC0_P0_3030			(ENC0_OFFSET + 0x30)
+#define HTOTAL_SEL_DP_ENC0_P0_SHIFT		0
+#define VTOTAL_SEL_DP_ENC0_P0_SHIFT		BIT(0)
+#define HSTART_SEL_DP_ENC0_P0_SHIFT		BIT(1)
+#define VSTART_SEL_DP_ENC0_P0_SHIFT		GENMASK(1, 0)
+#define HWIDTH_SEL_DP_ENC0_P0_SHIFT		BIT(2)
+#define VHEIGHT_SEL_DP_ENC0_P0_SHIFT		(BIT(0) | BIT(2))
+#define HSP_SEL_DP_ENC0_P0_SHIFT		GENMASK(2, 1)
+#define HSW_SEL_DP_ENC0_P0_SHIFT		GENMASK(2, 0)
+#define VSP_SEL_DP_ENC0_P0_SHIFT		BIT(3)
+#define VSW_SEL_DP_ENC0_P0_SHIFT		(BIT(0) | BIT(3))
+#define VBID_AUDIO_MUTE_FLAG_SW_DP_ENC0_P0_MASK	BIT(11)
+#define VBID_AUDIO_MUTE_SW_DP_ENC0_P0_SHIFT	(BIT(0) | BIT(1) | BIT(3))
+#define VBID_AUDIO_MUTE_FLAG_SEL_DP_ENC0_P0_MASK	BIT(12)
+#define VBID_AUDIO_MUTE_SEL_DP_ENC0_P0_SHIFT	GENMASK(3, 2)
+
+#define MTK_DP_ENC0_P0_3034	(ENC0_OFFSET + 0x34)
+
+#define MTK_DP_ENC0_P0_3038			(ENC0_OFFSET + 0x38)
+#define VIDEO_SOURCE_SEL_DP_ENC0_P0_MASK	BIT(11)
+#define VIDEO_SOURCE_SEL_DP_ENC0_P0_SHIFT	(BIT(0) | BIT(1) | BIT(3))
+
+#define MTK_DP_ENC0_P0_303C			(ENC0_OFFSET + 0x3C)
+#define SRAM_START_READ_THRD_DP_ENC0_P0_MASK	GENMASK(5, 0)
+#define SRAM_START_READ_THRD_DP_ENC0_P0_SHIFT	0
+#define VIDEO_COLOR_DEPTH_DP_ENC0_P0_MASK	GENMASK(10, 8)
+#define VIDEO_COLOR_DEPTH_DP_ENC0_P0_SHIFT	BIT(3)
+
+#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	GENMASK(14, 12)
+#define PIXEL_ENCODE_FORMAT_DP_ENC0_P0_SHIFT	GENMASK(3, 2)
+#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	 BIT(15)
+#define VIDEO_MN_GEN_EN_DP_ENC0_P0_SHIFT	GENMASK(3, 0)
+
+#define MTK_DP_ENC0_P0_3040			(ENC0_OFFSET + 0x40)
+#define SDP_DOWN_CNT_INIT_DP_ENC0_P0_MASK	GENMASK(11, 0)
+#define SDP_DOWN_CNT_INIT_DP_ENC0_P0_SHIFT	0
+
+#define MTK_DP_ENC0_P0_3044		(ENC0_OFFSET + 0x44)
+#define VIDEO_N_CODE_0_DP_ENC0_P0_MASK	GENMASK(15, 0)
+
+#define MTK_DP_ENC0_P0_3048		(ENC0_OFFSET + 0x48)
+#define VIDEO_N_CODE_1_DP_ENC0_P0_MASK	GENMASK(7, 0)
+
+#define MTK_DP_ENC0_P0_304C			(ENC0_OFFSET + 0x4C)
+#define VBID_VIDEO_MUTE_DP_ENC0_P0_MASK		BIT(2)
+#define SDP_VSYNC_RISING_MASK_DP_ENC0_P0_MASK	BIT(8)
+
+#define MTK_DP_ENC0_P0_3050			(ENC0_OFFSET + 0x50)
+#define VIDEO_N_CODE_MN_GEN_0_DP_ENC0_P0_MASK	GENMASK(15, 0)
+
+#define MTK_DP_ENC0_P0_3054			(ENC0_OFFSET + 0x54)
+#define VIDEO_N_CODE_MN_GEN_1_DP_ENC0_P0_MASK	GENMASK(7, 0)
+
+#define MTK_DP_ENC0_P0_3064		(ENC0_OFFSET + 0x64)
+#define HDE_NUM_LAST_DP_ENC0_P0_MASK	GENMASK(15, 0)
+
+#define MTK_DP_ENC0_P0_3088		(ENC0_OFFSET + 0x88)
+#define AU_EN_DP_ENC0_P0_MASK		BIT(6)
+#define AU_EN_DP_ENC0_P0_SHIFT		GENMASK(2, 1)
+#define AUDIO_8CH_EN_DP_ENC0_P0_MASK	BIT(7)
+#define AUDIO_8CH_SEL_DP_ENC0_P0_MASK	BIT(8)
+#define AUDIO_2CH_EN_DP_ENC0_P0_MASK	BIT(14)
+#define AUDIO_2CH_SEL_DP_ENC0_P0_MASK	BIT(15)
+
+#define MTK_DP_ENC0_P0_308C		(ENC0_OFFSET + 0x8C)
+#define CH_STATUS_0_DP_ENC0_P0_MASK	GENMASK(15, 0)
+
+#define MTK_DP_ENC0_P0_3090		(ENC0_OFFSET + 0x90)
+#define CH_STATUS_1_DP_ENC0_P0_MASK	GENMASK(15, 0)
+
+#define MTK_DP_ENC0_P0_3094		(ENC0_OFFSET + 0x94)
+#define CH_STATUS_2_DP_ENC0_P0_MASK	GENMASK(7, 0)
+
+#define MTK_DP_ENC0_P0_30A0		(ENC0_OFFSET + 0xA0)
+#define MTK_DP_ENC0_P0_30A4		(ENC0_OFFSET + 0xA4)
+#define AU_TS_CFG_DP_ENC0_P0_MASK	GENMASK(7, 0)
+#define MTK_DP_ENC0_P0_30A8		(ENC0_OFFSET + 0xA8)
+#define MTK_DP_ENC0_P0_30AC		(ENC0_OFFSET + 0xAC)
+#define MTK_DP_ENC0_P0_30B0		(ENC0_OFFSET + 0xB0)
+
+#define MTK_DP_ENC0_P0_30B4		(ENC0_OFFSET + 0xB4)
+#define ISRC_CFG_DP_ENC0_P0_MASK	GENMASK(15, 8)
+#define ISRC_CFG_DP_ENC0_P0_SHIFT	BIT(3)
+
+#define MTK_DP_ENC0_P0_30B8		(ENC0_OFFSET + 0xB8)
+
+#define MTK_DP_ENC0_P0_30BC		(ENC0_OFFSET + 0xBC)
+#define ISRC_CONT_DP_ENC0_P0_MASK	BIT(0)
+#define ISRC_CONT_DP_ENC0_P0_SHIFT	0
+#define AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_MASK	GENMASK(10, 8)
+#define AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_SHIFT	BIT(3)
+#define AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_MUL_2 \
+		(1 << AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_SHIFT)
+#define AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_MUL_4 \
+		(2 << AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_SHIFT)
+#define AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_MUL_8 \
+		(3 << AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_SHIFT)
+#define AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_DIV_2 \
+		(5 << AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_SHIFT)
+#define AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_DIV_4 \
+		(6 << AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_SHIFT)
+#define AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_DIV_8 \
+		(7 << AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_SHIFT)
+
+#define MTK_DP_ENC0_P0_30D8		(ENC0_OFFSET + 0xD8)
+#define MTK_DP_ENC0_P0_312C		(ENC0_OFFSET + 0x12C)
+#define ASP_HB2_DP_ENC0_P0_MASK		GENMASK(7, 0)
+#define ASP_HB3_DP_ENC0_P0_MASK		GENMASK(15, 8)
+#define ASP_HB3_DP_ENC0_P0_SHIFT	BIT(3)
+
+#define MTK_DP_ENC0_P0_3154			(ENC0_OFFSET + 0x154)
+#define PGEN_HTOTAL_DP_ENC0_P0_MASK		GENMASK(13, 0)
+#define MTK_DP_ENC0_P0_3158			(ENC0_OFFSET + 0x158)
+#define PGEN_HSYNC_RISING_DP_ENC0_P0_MASK	GENMASK(13, 0)
+#define MTK_DP_ENC0_P0_315C			(ENC0_OFFSET + 0x15C)
+#define PGEN_HSYNC_PULSE_WIDTH_DP_ENC0_P0_MASK	GENMASK(13, 0)
+#define MTK_DP_ENC0_P0_3160			(ENC0_OFFSET + 0x160)
+#define PGEN_HFDE_START_DP_ENC0_P0_MASK		GENMASK(13, 0)
+#define MTK_DP_ENC0_P0_3164			(ENC0_OFFSET + 0x164)
+#define PGEN_HFDE_ACTIVE_WIDTH_DP_ENC0_P0_MASK	GENMASK(13, 0)
+#define MTK_DP_ENC0_P0_3168			(ENC0_OFFSET + 0x168)
+#define PGEN_VTOTAL_DP_ENC0_P0_MASK		GENMASK(12, 0)
+#define MTK_DP_ENC0_P0_316C			(ENC0_OFFSET + 0x16C)
+#define PGEN_VSYNC_RISING_DP_ENC0_P0_MASK	GENMASK(12, 0)
+#define MTK_DP_ENC0_P0_3170			(ENC0_OFFSET + 0x170)
+#define PGEN_VSYNC_PULSE_WIDTH_DP_ENC0_P0_MASK	GENMASK(12, 0)
+#define MTK_DP_ENC0_P0_3174			(ENC0_OFFSET + 0x174)
+#define PGEN_VFDE_START_DP_ENC0_P0_MASK		GENMASK(12, 0)
+#define MTK_DP_ENC0_P0_3178			(ENC0_OFFSET + 0x178)
+#define PGEN_VFDE_ACTIVE_WIDTH_DP_ENC0_P0_MASK	GENMASK(12, 0)
+#define MTK_DP_ENC0_P0_31B0			(ENC0_OFFSET + 0x1B0)
+#define PGEN_PATTERN_SEL_SHIFT			BIT(2)
+#define PGEN_PATTERN_SEL_MASK			GENMASK(6, 4)
+
+#define MTK_DP_ENC0_P0_31C8			(ENC0_OFFSET + 0x1C8)
+#define VSC_EXT_VESA_HB0_DP_ENC0_P0_MASK	GENMASK(7, 0)
+#define VSC_EXT_VESA_HB1_DP_ENC0_P0_MASK	GENMASK(15, 8)
+#define VSC_EXT_VESA_HB1_DP_ENC0_P0_SHIFT	BIT(3)
+
+#define MTK_DP_ENC0_P0_31CC			(ENC0_OFFSET + 0x1CC)
+#define VSC_EXT_VESA_HB2_DP_ENC0_P0_MASK	GENMASK(7, 0)
+#define VSC_EXT_VESA_HB2_DP_ENC0_P0_SHIFT	0
+#define VSC_EXT_VESA_HB3_DP_ENC0_P0_MASK	GENMASK(15, 8)
+
+#define MTK_DP_ENC0_P0_31D0			(ENC0_OFFSET + 0x1D0)
+#define VSC_EXT_CEA_HB0_DP_ENC0_P0_MASK		GENMASK(7, 0)
+#define VSC_EXT_CEA_HB1_DP_ENC0_P0_MASK		GENMASK(15, 8)
+#define VSC_EXT_CEA_HB1_DP_ENC0_P0_SHIFT	BIT(3)
+
+#define MTK_DP_ENC0_P0_31D4			(ENC0_OFFSET + 0x1D4)
+#define VSC_EXT_CEA_HB2_DP_ENC0_P0_MASK		GENMASK(7, 0)
+#define VSC_EXT_CEA_HB2_DP_ENC0_P0_SHIFT	0
+#define VSC_EXT_CEA_HB3_DP_ENC0_P0_MASK		GENMASK(15, 8)
+
+#define MTK_DP_ENC0_P0_31D8			(ENC0_OFFSET + 0x1D8)
+#define VSC_EXT_VESA_NUM_DP_ENC0_P0_MASK	GENMASK(5, 0)
+#define VSC_EXT_VESA_NUM_DP_ENC0_P0_SHIFT	0
+#define VSC_EXT_CEA_NUM_DP_ENC0_P0_MASK		GENMASK(13, 8)
+#define VSC_EXT_CEA_NUM_DP_ENC0_P0_SHIFT	BIT(3)
+
+#define MTK_DP_ENC0_P0_31DC			(ENC0_OFFSET + 0x1DC)
+#define HDR0_CFG_DP_ENC0_P0_MASK		GENMASK(7, 0)
+#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	BIT(4)
+#define AUDIO_CH_SRC_SEL_DP_ENC0_P0_SHIFT	BIT(2)
+#define ISRC1_HB3_DP_ENC0_P0_MASK		GENMASK(15, 8)
+#define ISRC1_HB3_DP_ENC0_P0_SHIFT		BIT(3)
+
+#define MTK_DP_ENC1_P0_3200		(ENC1_OFFSET + 0x00)
+#define MTK_DP_ENC1_P0_3280		(ENC1_OFFSET + 0x80)
+#define SDP_PACKET_TYPE_DP_ENC1_P0_MASK	GENMASK(4, 0)
+#define SDP_PACKET_W_DP_ENC1_P0		BIT(5)
+#define SDP_PACKET_W_DP_ENC1_P0_MASK	BIT(5)
+#define SDP_PACKET_W_DP_ENC1_P0_SHIFT	(BIT(0) | BIT(2))
+
+#define MTK_DP_ENC1_P0_328C	(ENC1_OFFSET + 0x8C)
+#define MTK_DP_ENC1_P0_3290	(ENC1_OFFSET + 0x90)
+#define MTK_DP_ENC1_P0_32A0	(ENC1_OFFSET + 0xA0)
+#define MTK_DP_ENC1_P0_32A4	(ENC1_OFFSET + 0xA4)
+
+#define MTK_DP_ENC1_P0_3300			(ENC1_OFFSET + 0x100)
+#define VIDEO_AFIFO_RDY_SEL_DP_ENC1_P0_MASK	GENMASK(9, 8)
+#define VIDEO_AFIFO_RDY_SEL_DP_ENC1_P0_SHIFT	BIT(3)
+
+#define MTK_DP_ENC1_P0_3304				(ENC1_OFFSET + 0x104)
+#define AU_PRTY_REGEN_DP_ENC1_P0_MASK			BIT(8)
+#define AU_CH_STS_REGEN_DP_ENC1_P0_MASK			BIT(9)
+#define AUDIO_SAMPLE_PRSENT_REGEN_DP_ENC1_P0_MASK	(BIT(12))
+
+#define MTK_DP_ENC1_P0_3324			(ENC1_OFFSET + 0x124)
+#define AUDIO_SOURCE_MUX_DP_ENC1_P0_MASK	GENMASK(9, 8)
+#define AUDIO_SOURCE_MUX_DP_ENC1_P0_SHIFT	BIT(3)
+#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	GENMASK(11, 0)
+#define SDP_DOWN_CNT_INIT_IN_HBLANK_DP_ENC1_P0_SHIFT	0
+#define FIFO_READ_START_POINT_DP_ENC1_P0_MASK		GENMASK(15, 12)
+#define FIFO_READ_START_POINT_DP_ENC1_P0_SHIFT		GENMASK(3, 2)
+
+#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		BIT(2)
+#define SDP_DP13_EN_DP_ENC1_P0_SHIFT			BIT(3)
+#define BS2BS_MODE_DP_ENC1_P0_MASK			GENMASK(13, 12)
+#define BS2BS_MODE_DP_ENC1_P0_SHIFT			GENMASK(3, 2)
+
+#define MTK_DP_ENC1_P0_33F4	(ENC1_OFFSET + 0x1F4)
+
+#define MTK_DP_TRANS_P0_3400		(TRANS_OFFSET + 0)
+#define PATTERN1_EN_DP_TRANS_P0_MASK	BIT(12)
+#define PATTERN1_EN_DP_TRANS_P0_SHIFT	GENMASK(3, 2)
+#define PATTERN2_EN_DP_TRANS_P0_MASK	BIT(13)
+#define PATTERN3_EN_DP_TRANS_P0_MASK	BIT(14)
+#define PATTERN4_EN_DP_TRANS_P0_MASK	BIT(15)
+
+#define MTK_DP_TRANS_P0_3404		(TRANS_OFFSET + 0x4)
+#define DP_SCR_EN_DP_TRANS_P0_MASK	BIT(0)
+
+#define MTK_DP_TRANS_P0_340C				(TRANS_OFFSET + 0xC)
+#define DP_TX_TRANSMITTER_4P_RESET_SW_DP_TRANS_P0_MASK	BIT(13)
+#define DP_TX_TRANSMITTER_4P_RESET_SW_DP_TRANS_P0_SHIFT \
+		(BIT(0) | BIT(2) | BIT(3))
+
+#define MTK_DP_TRANS_P0_3410			(TRANS_OFFSET + 0x10)
+#define HPD_DEB_THD_DP_TRANS_P0_MASK		GENMASK(3, 0)
+#define HPD_DEB_THD_DP_TRANS_P0_SHIFT		0
+#define HPD_INT_THD_DP_TRANS_P0_MASK		GENMASK(7, 4)
+#define HPD_INT_THD_DP_TRANS_P0_SHIFT		BIT(2)
+#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	GENMASK(11, 8)
+#define HPD_DISC_THD_DP_TRANS_P0_SHIFT	BIT(3)
+#define HPD_CONN_THD_DP_TRANS_P0_MASK	GENMASK(15, 12)
+#define HPD_CONN_THD_DP_TRANS_P0_SHIFT	GENMASK(3, 2)
+
+#define MTK_DP_TRANS_P0_3414	(TRANS_OFFSET + 0x14)
+#define HPD_DB_DP_TRANS_P0_MASK	BIT(2)
+
+#define MTK_DP_TRANS_P0_3418		(TRANS_OFFSET + 0x18)
+#define IRQ_CLR_DP_TRANS_P0_MASK	GENMASK(3, 0)
+#define IRQ_MASK_DP_TRANS_P0_MASK	GENMASK(7, 4)
+#define IRQ_MASK_DP_TRANS_P0_SHIFT	BIT(2)
+#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	GENMASK(15, 12)
+#define IRQ_STATUS_DP_TRANS_P0_SHIFT	GENMASK(3, 2)
+
+#define MTK_DP_TRANS_P0_342C		(TRANS_OFFSET + 0x2C)
+#define XTAL_FREQ_DP_TRANS_P0_DEFAULT	(BIT(0) | BIT(3) | BIT(5) | BIT(6))
+#define XTAL_FREQ_DP_TRANS_P0_MASK	GENMASK(7, 0)
+
+#define MTK_DP_TRANS_P0_3430				(TRANS_OFFSET + 0x30)
+#define HPD_INT_THD_ECO_DP_TRANS_P0_MASK		GENMASK(1, 0)
+#define HPD_INT_THD_ECO_DP_TRANS_P0_HIGH_BOUND_EXT	BIT(1)
+
+#define MTK_DP_TRANS_P0_34A4		(TRANS_OFFSET + 0xA4)
+#define LANE_NUM_DP_TRANS_P0_MASK	GENMASK(3, 2)
+#define LANE_NUM_DP_TRANS_P0_SHIFT	BIT(1)
+
+#define MTK_DP_TRANS_P0_3540			(TRANS_OFFSET + 0x140)
+#define FEC_EN_DP_TRANS_P0_MASK			BIT(0)
+#define FEC_EN_DP_TRANS_P0_SHIFT		0
+#define FEC_CLOCK_EN_MODE_DP_TRANS_P0_MASK	BIT(3)
+#define FEC_CLOCK_EN_MODE_DP_TRANS_P0_SHIFT	GENMASK(1, 0)
+
+#define MTK_DP_TRANS_P0_3580				(TRANS_OFFSET + 0x180)
+#define POST_MISC_DATA_LANE0_OV_DP_TRANS_P0_MASK	BIT(8)
+#define POST_MISC_DATA_LANE1_OV_DP_TRANS_P0_MASK	BIT(9)
+#define POST_MISC_DATA_LANE2_OV_DP_TRANS_P0_MASK	(BIT(10))
+#define POST_MISC_DATA_LANE3_OV_DP_TRANS_P0_MASK	(BIT(11))
+
+#define MTK_DP_TRANS_P0_35C4		(TRANS_OFFSET + 0x1C4)
+#define SW_IRQ_MASK_DP_TRANS_P0_MASK	GENMASK(15, 0)
+
+#define MTK_DP_TRANS_P0_35C8		(TRANS_OFFSET + 0x1C8)
+#define SW_IRQ_CLR_DP_TRANS_P0_MASK	GENMASK(15, 0)
+
+#define SW_IRQ_STATUS_DP_TRANS_P0_MASK	GENMASK(15, 0)
+#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	GENMASK(15, 0)
+
+#define MTK_DP_TRANS_P0_35F0	(TRANS_OFFSET + 0x1F0)
+
+#define MTK_DP_AUX_P0_360C		(AUX_OFFSET + 0xC)
+#define AUX_TIMEOUT_THR_AUX_TX_P0_MASK	GENMASK(12, 0)
+
+#define MTK_DP_AUX_P0_3614			(AUX_OFFSET + 0x14)
+#define AUX_RX_UI_CNT_THR_AUX_TX_P0_MASK	GENMASK(6, 0)
+#define AUX_RX_UI_CNT_THR_AUX_TX_P0_SHIFT	0
+
+#define MTK_DP_AUX_P0_3618				(AUX_OFFSET + 0x18)
+#define AUX_RX_FIFO_FULL_AUX_TX_P0_MASK			BIT(9)
+#define AUX_RX_FIFO_WRITE_POINTER_AUX_TX_P0_MASK	GENMASK(3, 0)
+
+#define MTK_DP_AUX_P0_3620			(AUX_OFFSET + 0x20)
+#define AUX_RD_MODE_AUX_TX_P0_MASK		BIT(9)
+#define AUX_RX_FIFO_READ_PULSE_TX_P0_MASK	BIT(8)
+#define AUX_RX_FIFO_R_PULSE_TX_P0_SHIFT		BIT(3)
+#define AUX_RX_FIFO_READ_DATA_AUX_TX_P0_MASK	GENMASK(7, 0)
+#define AUX_RX_FIFO_READ_DATA_AUX_TX_P0_SHIFT	0
+
+#define MTK_DP_AUX_P0_3624			(AUX_OFFSET + 0x24)
+#define AUX_RX_REPLY_COMMAND_AUX_TX_P0_MASK	GENMASK(3, 0)
+
+#define MTK_DP_AUX_P0_3628			(AUX_OFFSET + 0x28)
+#define AUX_RX_PHY_STATE_AUX_TX_P0_MASK		GENMASK(9, 0)
+#define AUX_RX_PHY_STATE_AUX_TX_P0_SHIFT	0
+#define AUX_RX_PHY_STATE_AUX_TX_P0_RX_IDLE \
+		(BIT(0) << AUX_RX_PHY_STATE_AUX_TX_P0_SHIFT)
+
+#define MTK_DP_AUX_P0_362C			(AUX_OFFSET + 0x2C)
+#define AUX_NO_LENGTH_AUX_TX_P0_MASK		BIT(0)
+#define AUX_NO_LENGTH_AUX_TX_P0_SHIFT		0
+#define AUX_TX_AUXTX_OV_EN_AUX_TX_P0_MASK	BIT(1)
+#define AUX_RESERVED_RW_0_AUX_TX_P0_MASK	GENMASK(15, 2)
+
+#define MTK_DP_AUX_P0_3630			(AUX_OFFSET + 0x30)
+#define AUX_TX_REQUEST_READY_AUX_TX_P0_MASK	BIT(3)
+#define AUX_TX_REQUEST_READY_AUX_TX_P0_SHIFT	GENMASK(1, 0)
+
+#define MTK_DP_AUX_P0_3634			(AUX_OFFSET + 0x34)
+#define AUX_TX_OVER_SAMPLE_RATE_AUX_TX_P0_MASK	GENMASK(15, 8)
+#define AUX_TX_OVER_SAMPLE_RATE_AUX_TX_P0_SHIFT	BIT(3)
+
+#define MTK_DP_AUX_P0_3640				(AUX_OFFSET + 0x40)
+#define AUX_RX_RECV_COMPLETE_IRQ_TX_P0_MASK		BIT(6)
+#define AUX_RX_AUX_RECV_COMPLETE_IRQ_AUX_TX_P0_SHIFT	GENMASK(2, 1)
+#define AUX_RX_EDID_RECV_COMPLETE_IRQ_AUX_TX_P0_SHIFT	(BIT(0) | BIT(2))
+#define AUX_RX_MCCS_RECV_COMPLETE_IRQ_AUX_TX_P0_SHIFT	BIT(2)
+#define AUX_RX_CMD_RECV_IRQ_AUX_TX_P0_SHIFT		GENMASK(1, 0)
+#define AUX_RX_ADDR_RECV_IRQ_AUX_TX_P0_SHIFT		BIT(1)
+#define AUX_RX_DATA_RECV_IRQ_AUX_TX_P0_SHIFT		BIT(0)
+#define AUX_400US_TIMEOUT_IRQ_AUX_TX_P0_MASK		BIT(0)
+#define AUX_400US_TIMEOUT_IRQ_AUX_TX_P0_SHIFT		0
+
+#define MTK_DP_AUX_P0_3644			(AUX_OFFSET + 0x44)
+#define MCU_REQUEST_COMMAND_AUX_TX_P0_MASK	GENMASK(3, 0)
+
+#define MTK_DP_AUX_P0_3648			(AUX_OFFSET + 0x48)
+#define MCU_REQUEST_ADDRESS_LSB_AUX_TX_P0_MASK	GENMASK(15, 0)
+
+#define MTK_DP_AUX_P0_364C			(AUX_OFFSET + 0x4C)
+#define MCU_REQUEST_ADDRESS_MSB_AUX_TX_P0_MASK	GENMASK(3, 0)
+
+#define MTK_DP_AUX_P0_3650			(AUX_OFFSET + 0x50)
+#define MCU_REQ_DATA_NUM_AUX_TX_P0_MASK		GENMASK(15, 12)
+#define MCU_REQ_DATA_NUM_AUX_TX_P0_SHIFT	GENMASK(3, 2)
+#define PHY_FIFO_RST_AUX_TX_P0_MASK		BIT(9)
+#define MCU_ACK_TRAN_COMPLETE_AUX_TX_P0_MASK	BIT(8)
+#define MCU_ACK_TRAN_COMPLETE_AUX_TX_P0_SHIFT	BIT(3)
+
+#define MTK_DP_AUX_P0_3658			(AUX_OFFSET + 0x58)
+#define AUX_TX_OV_EN_AUX_TX_P0_MASK		BIT(0)
+#define MTK_DP_AUX_P0_3690			(AUX_OFFSET + 0x90)
+#define RX_REPLY_COMPLETE_MODE_AUX_TX_P0_MASK	BIT(8)
+#define RX_REPLY_COMPLETE_MODE_AUX_TX_P0_SHIFT	BIT(3)
+#define MTK_DP_AUX_P0_3704			(AUX_OFFSET + 0x104)
+
+#define AUX_TX_FIFO_WRITE_DATA_NEW_MODE_TOGGLE_AUX_TX_P0_MASK	BIT(1)
+#define AUX_TX_FIFO_NEW_MODE_EN_AUX_TX_P0_MASK			BIT(2)
+#define AUX_TX_FIFO_NEW_MODE_EN_AUX_TX_P0_SHIFT			BIT(1)
+
+#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	BIT(0)
+#define MTK_ATOP_EN_AUX_TX_P0_SHIFT	0
+
+#define MTK_DP_TOP_PWR_STATE		(TOP_OFFSET + 0x0)
+#define DP_PWR_STATE_MASK		GENMASK(1, 0)
+#define DP_PWR_STATE_BANDGAP		BIT(0)
+#define DP_PWR_STATE_BANDGAP_TPLL	BIT(1)
+#define DP_PWR_STATE_BANDGAP_TPLL_LANE	GENMASK(1, 0)
+
+#define MTK_DP_TOP_SWING_EMP	(TOP_OFFSET + 0x4)
+#define DP_TX0_VOLT_SWING_MASK	GENMASK(1, 0)
+#define DP_TX0_VOLT_SWING_SHIFT	0
+#define DP_TX0_PRE_EMPH_MASK	GENMASK(3, 2)
+#define DP_TX0_PRE_EMPH_SHIFT	BIT(1)
+#define DP_TX1_VOLT_SWING_MASK	GENMASK(9, 8)
+#define DP_TX1_VOLT_SWING_SHIFT	BIT(3)
+#define DP_TX1_PRE_EMPH_MASK	GENMASK(11, 10)
+#define DP_TX2_VOLT_SWING_MASK	GENMASK(17, 16)
+#define DP_TX2_PRE_EMPH_MASK	GENMASK(19, 18)
+#define DP_TX3_VOLT_SWING_MASK	GENMASK(25, 24)
+#define DP_TX3_PRE_EMPH_MASK	GENMASK(27, 26)
+
+#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		BIT(1)
+
+#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 78e79c8449c8..8023f1bd5f7e 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
@@ -1033,6 +1033,9 @@ static struct platform_driver * const mtk_drm_drivers[] = {
 	&mtk_disp_ovl_driver,
 	&mtk_disp_rdma_driver,
 	&mtk_dpi_driver,
+#if IS_REACHABLE(CONFIG_DRM_MEDIATEK_DP)
+	&mtk_dp_driver,
+#endif
 	&mtk_drm_platform_driver,
 	&mtk_dsi_driver,
 	&mtk_ethdr_driver,
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.h b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
index acbf14b597db..0f96f76f6a51 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
@@ -67,6 +67,9 @@ extern struct platform_driver mtk_disp_ovl_adaptor_driver;
 extern struct platform_driver mtk_disp_ovl_driver;
 extern struct platform_driver mtk_disp_rdma_driver;
 extern struct platform_driver mtk_dpi_driver;
+#if IS_REACHABLE(CONFIG_DRM_MEDIATEK_DP)
+extern struct platform_driver mtk_dp_driver;
+#endif
 extern struct platform_driver mtk_dsi_driver;
 extern struct platform_driver mtk_ethdr_driver;
 extern struct platform_driver mtk_mdp_rdma_driver;