drm/mediatek: Add MT8195 Embedded DisplayPort driver

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>
Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220901044149.16782-4-rex-bc.chen@mediatek.com

1 files changed, 1999 insertions, 0 deletions

diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/mtk_dp.c
new file mode 100644
index 000000000000..e2ec9b02b1aa
--- /dev/null
+++ b/drivers/gpu/drm/mediatek/mtk_dp.c
@@ -0,0 +1,1999 @@
+// 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/media-bus-format.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 <linux/soc/mediatek/mtk_sip_svc.h>
+#include <video/videomode.h>
+
+#include "mtk_dp_reg.h"
+
+#define MTK_DP_SIP_CONTROL_AARCH32	MTK_SIP_SMC_CMD(0x523)
+#define MTK_DP_SIP_ATF_EDP_VIDEO_UNMUTE	(BIT(0) | BIT(5))
+
+#define MTK_DP_THREAD_CABLE_STATE_CHG	BIT(0)
+#define MTK_DP_THREAD_HPD_EVENT		BIT(1)
+
+#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_TBC_BUF_READ_START_ADDR 0x8
+#define MTK_DP_TRAIN_VOLTAGE_LEVEL_RETRY 5
+#define MTK_DP_TRAIN_DOWNSCALE_RETRY 10
+
+enum {
+	MTK_DP_CAL_GLB_BIAS_TRIM = 0,
+	MTK_DP_CAL_CLKTX_IMPSE,
+	MTK_DP_CAL_LN_TX_IMPSEL_PMOS_0,
+	MTK_DP_CAL_LN_TX_IMPSEL_PMOS_1,
+	MTK_DP_CAL_LN_TX_IMPSEL_PMOS_2,
+	MTK_DP_CAL_LN_TX_IMPSEL_PMOS_3,
+	MTK_DP_CAL_LN_TX_IMPSEL_NMOS_0,
+	MTK_DP_CAL_LN_TX_IMPSEL_NMOS_1,
+	MTK_DP_CAL_LN_TX_IMPSEL_NMOS_2,
+	MTK_DP_CAL_LN_TX_IMPSEL_NMOS_3,
+	MTK_DP_CAL_MAX,
+};
+
+struct mtk_dp_train_info {
+	bool sink_ssc;
+	bool cable_plugged_in;
+	/* link_rate is in multiple of 0.27Gbps */
+	int link_rate;
+	int lane_count;
+	unsigned int channel_eq_pattern;
+};
+
+struct mtk_dp_info {
+	enum dp_pixelformat format;
+	struct videomode vm;
+};
+
+struct mtk_dp_efuse_fmt {
+	unsigned short idx;
+	unsigned short shift;
+	unsigned short mask;
+	unsigned short min_val;
+	unsigned short max_val;
+	unsigned short default_val;
+};
+
+struct mtk_dp {
+	bool enabled;
+	u8 max_lanes;
+	u8 max_linkrate;
+	u8 rx_cap[DP_RECEIVER_CAP_SIZE];
+	u32 cal_data[MTK_DP_CAL_MAX];
+	u32 irq_thread_handle;
+	/* irq_thread_lock is used to protect irq_thread_handle */
+	spinlock_t irq_thread_lock;
+
+	struct device *dev;
+	struct drm_bridge bridge;
+	struct drm_bridge *next_bridge;
+	struct drm_connector *conn;
+	struct drm_device *drm_dev;
+	struct drm_dp_aux aux;
+
+	struct mtk_dp_info info;
+	struct mtk_dp_train_info train_info;
+
+	struct platform_device *phy_dev;
+	struct phy *phy;
+	struct regmap *regs;
+};
+
+static const struct mtk_dp_efuse_fmt mtk_dp_efuse_data[MTK_DP_CAL_MAX] = {
+	[MTK_DP_CAL_GLB_BIAS_TRIM] = {
+		.idx = 3,
+		.shift = 27,
+		.mask = 0x1f,
+		.min_val = 1,
+		.max_val = 0x1e,
+		.default_val = 0xf,
+	},
+	[MTK_DP_CAL_CLKTX_IMPSE] = {
+		.idx = 0,
+		.shift = 9,
+		.mask = 0xf,
+		.min_val = 1,
+		.max_val = 0xe,
+		.default_val = 0x8,
+	},
+	[MTK_DP_CAL_LN_TX_IMPSEL_PMOS_0] = {
+		.idx = 2,
+		.shift = 28,
+		.mask = 0xf,
+		.min_val = 1,
+		.max_val = 0xe,
+		.default_val = 0x8,
+	},
+	[MTK_DP_CAL_LN_TX_IMPSEL_PMOS_1] = {
+		.idx = 2,
+		.shift = 20,
+		.mask = 0xf,
+		.min_val = 1,
+		.max_val = 0xe,
+		.default_val = 0x8,
+	},
+	[MTK_DP_CAL_LN_TX_IMPSEL_PMOS_2] = {
+		.idx = 2,
+		.shift = 12,
+		.mask = 0xf,
+		.min_val = 1,
+		.max_val = 0xe,
+		.default_val = 0x8,
+	},
+	[MTK_DP_CAL_LN_TX_IMPSEL_PMOS_3] = {
+		.idx = 2,
+		.shift = 4,
+		.mask = 0xf,
+		.min_val = 1,
+		.max_val = 0xe,
+		.default_val = 0x8,
+	},
+	[MTK_DP_CAL_LN_TX_IMPSEL_NMOS_0] = {
+		.idx = 2,
+		.shift = 24,
+		.mask = 0xf,
+		.min_val = 1,
+		.max_val = 0xe,
+		.default_val = 0x8,
+	},
+	[MTK_DP_CAL_LN_TX_IMPSEL_NMOS_1] = {
+		.idx = 2,
+		.shift = 16,
+		.mask = 0xf,
+		.min_val = 1,
+		.max_val = 0xe,
+		.default_val = 0x8,
+	},
+	[MTK_DP_CAL_LN_TX_IMPSEL_NMOS_2] = {
+		.idx = 2,
+		.shift = 8,
+		.mask = 0xf,
+		.min_val = 1,
+		.max_val = 0xe,
+		.default_val = 0x8,
+	},
+	[MTK_DP_CAL_LN_TX_IMPSEL_NMOS_3] = {
+		.idx = 2,
+		.shift = 0,
+		.mask = 0xf,
+		.min_val = 1,
+		.max_val = 0xe,
+		.default_val = 0x8,
+	},
+};
+
+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 int mtk_dp_write(struct mtk_dp *mtk_dp, u32 offset, u32 val)
+{
+	int 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\n",
+			offset, val);
+	return ret;
+}
+
+static int mtk_dp_update_bits(struct mtk_dp *mtk_dp, u32 offset,
+			      u32 val, u32 mask)
+{
+	int 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\n",
+			offset, val, mask);
+	return ret;
+}
+
+static void mtk_dp_bulk_16bit_write(struct mtk_dp *mtk_dp, u32 offset, u8 *buf,
+				    size_t length)
+{
+	int i;
+
+	/* 2 bytes per register */
+	for (i = 0; i < length; i += 2) {
+		u32 val = buf[i] | (i + 1 < length ? buf[i + 1] << 8 : 0);
+
+		if (mtk_dp_write(mtk_dp, offset + i * 2, val))
+			return;
+	}
+}
+
+static void mtk_dp_msa_bypass_enable(struct mtk_dp *mtk_dp, bool enable)
+{
+	u32 mask = HTOTAL_SEL_DP_ENC0_P0 | VTOTAL_SEL_DP_ENC0_P0 |
+		   HSTART_SEL_DP_ENC0_P0 | VSTART_SEL_DP_ENC0_P0 |
+		   HWIDTH_SEL_DP_ENC0_P0 | VHEIGHT_SEL_DP_ENC0_P0 |
+		   HSP_SEL_DP_ENC0_P0 | HSW_SEL_DP_ENC0_P0 |
+		   VSP_SEL_DP_ENC0_P0 | VSW_SEL_DP_ENC0_P0;
+
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3030, enable ? 0 : mask, mask);
+}
+
+static void mtk_dp_set_msa(struct mtk_dp *mtk_dp)
+{
+	struct drm_display_mode mode;
+	struct videomode *vm = &mtk_dp->info.vm;
+
+	drm_display_mode_from_videomode(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,
+			   vm->hsync_len + vm->hback_porch,
+			   HSTART_SW_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3028,
+			   vm->hsync_len, 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,
+			   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,
+			   vm->vsync_len + vm->vback_porch,
+			   VSTART_SW_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_302C,
+			   vm->vsync_len, 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,
+			   vm->vactive, VHEIGHT_SW_DP_ENC0_P0_MASK);
+
+	/* horizontal */
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3064,
+			   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,
+			   vm->hfront_porch,
+			   PGEN_HSYNC_RISING_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_315C,
+			   vm->hsync_len,
+			   PGEN_HSYNC_PULSE_WIDTH_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3160,
+			   vm->hback_porch + vm->hsync_len,
+			   PGEN_HFDE_START_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3164,
+			   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,
+			   vm->vfront_porch,
+			   PGEN_VSYNC_RISING_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3170,
+			   vm->vsync_len,
+			   PGEN_VSYNC_PULSE_WIDTH_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3174,
+			   vm->vback_porch + vm->vsync_len,
+			   PGEN_VFDE_START_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3178,
+			   vm->vactive,
+			   PGEN_VFDE_ACTIVE_WIDTH_DP_ENC0_P0_MASK);
+}
+
+static int mtk_dp_set_color_format(struct mtk_dp *mtk_dp,
+				   enum dp_pixelformat color_format)
+{
+	u32 val;
+
+	/* 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_RGB:
+		val = PIXEL_ENCODE_FORMAT_DP_ENC0_P0_RGB;
+		break;
+	default:
+		drm_warn(mtk_dp->drm_dev, "Unsupported color format: %d\n",
+			 color_format);
+		return -EINVAL;
+	}
+
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_303C,
+			   val, PIXEL_ENCODE_FORMAT_DP_ENC0_P0_MASK);
+	return 0;
+}
+
+static void mtk_dp_set_color_depth(struct mtk_dp *mtk_dp)
+{
+	/* Only support 8 bits currently */
+	/* Update MISC0 */
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3034,
+			   DP_MSA_MISC_8_BPC, DP_TEST_BIT_DEPTH_MASK);
+
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_303C,
+			   VIDEO_COLOR_DEPTH_DP_ENC0_P0_8BIT,
+			   VIDEO_COLOR_DEPTH_DP_ENC0_P0_MASK);
+}
+
+static void mtk_dp_config_mn_mode(struct mtk_dp *mtk_dp)
+{
+	/* 0: hw mode, 1: sw mode */
+	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_MASK);
+}
+
+static void mtk_dp_setup_encoder(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_303C,
+			   VIDEO_MN_GEN_EN_DP_ENC0_P0,
+			   VIDEO_MN_GEN_EN_DP_ENC0_P0);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3040,
+			   SDP_DOWN_CNT_DP_ENC0_P0_VAL,
+			   SDP_DOWN_CNT_INIT_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3364,
+			   SDP_DOWN_CNT_IN_HBLANK_DP_ENC1_P0_VAL,
+			   SDP_DOWN_CNT_INIT_IN_HBLANK_DP_ENC1_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3300,
+			   VIDEO_AFIFO_RDY_SEL_DP_ENC1_P0_VAL << 8,
+			   VIDEO_AFIFO_RDY_SEL_DP_ENC1_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC1_P0_3364,
+			   FIFO_READ_START_POINT_DP_ENC1_P0_VAL << 12,
+			   FIFO_READ_START_POINT_DP_ENC1_P0_MASK);
+	mtk_dp_write(mtk_dp, MTK_DP_ENC1_P0_3368, DP_ENC1_P0_3368_VAL);
+}
+
+static void mtk_dp_pg_enable(struct mtk_dp *mtk_dp, bool enable)
+{
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3038,
+			   enable ? VIDEO_SOURCE_SEL_DP_ENC0_P0_MASK : 0,
+			   VIDEO_SOURCE_SEL_DP_ENC0_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_31B0,
+			   PGEN_PATTERN_SEL_VAL << 4, PGEN_PATTERN_SEL_MASK);
+}
+
+static void mtk_dp_aux_irq_clear(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_write(mtk_dp, MTK_DP_AUX_P0_3640, DP_AUX_P0_3640_VAL);
+}
+
+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_clear_fifo(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_3650,
+			   MCU_ACK_TRAN_COMPLETE_AUX_TX_P0,
+			   MCU_ACK_TRAN_COMPLETE_AUX_TX_P0 |
+			   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,
+			   AUX_TX_REQUEST_READY_AUX_TX_P0,
+			   AUX_TX_REQUEST_READY_AUX_TX_P0);
+}
+
+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,
+				   AUX_RX_FIFO_READ_PULSE_TX_P0,
+				   AUX_RX_FIFO_READ_PULSE_TX_P0);
+
+		/* 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);
+	}
+}
+
+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) << 12,
+				   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 |
+				   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,
+				   AUX_NO_LENGTH_AUX_TX_P0,
+				   AUX_NO_LENGTH_AUX_TX_P0 |
+				   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_AUX_RECV_COMPLETE_IRQ_AUX_TX_P0)
+			return 0;
+
+		if (aux_irq_status & AUX_400US_TIMEOUT_IRQ_AUX_TX_P0)
+			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,
+				   AUX_TX_FIFO_NEW_MODE_EN_AUX_TX_P0,
+				   AUX_TX_FIFO_NEW_MODE_EN_AUX_TX_P0);
+
+	/* We need to clear fifo and irq before sending commands to the sink device. */
+	mtk_dp_aux_clear_fifo(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_WDATA_NEW_MODE_T_AUX_TX_P0_MASK,
+				   AUX_TX_FIFO_WDATA_NEW_MODE_T_AUX_TX_P0_MASK);
+	}
+
+	mtk_dp_aux_request_ready(mtk_dp);
+
+	/* Wait for feedback from sink device. */
+	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;
+		}
+
+		return -ETIMEDOUT;
+	}
+
+	if (!length) {
+		mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_362C,
+				   0,
+				   AUX_NO_LENGTH_AUX_TX_P0 |
+				   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);
+	}
+
+	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) >> 12;
+
+	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,
+			   FEC_CLOCK_EN_MODE_DP_TRANS_P0,
+			   FEC_CLOCK_EN_MODE_DP_TRANS_P0);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_31EC,
+			   AUDIO_CH_SRC_SEL_DP_ENC0_P0,
+			   AUDIO_CH_SRC_SEL_DP_ENC0_P0);
+	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_MASK);
+
+	val = (HPD_INT_THD_DP_TRANS_P0_LOWER_500US |
+	       HPD_INT_THD_DP_TRANS_P0_UPPER_1100US) << 4;
+	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 << 8) | (5 << 12);
+	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,
+			   AUX_TIMEOUT_THR_AUX_TX_P0_VAL,
+			   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,
+			   AUX_TX_OVER_SAMPLE_RATE_FOR_26M << 8,
+			   AUX_TX_OVER_SAMPLE_RATE_AUX_TX_P0_MASK);
+	/* 13 for 26M */
+	mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_3614,
+			   AUX_RX_UI_CNT_THR_AUX_FOR_26M,
+			   AUX_RX_UI_CNT_THR_AUX_TX_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_37C8,
+			   MTK_ATOP_EN_AUX_TX_P0,
+			   MTK_ATOP_EN_AUX_TX_P0);
+}
+
+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_update_bits(mtk_dp, MTK_DP_ENC1_P0_3368,
+			   BS2BS_MODE_DP_ENC1_P0_VAL << 12,
+			   BS2BS_MODE_DP_ENC1_P0_MASK);
+
+	/* dp tx encoder reset all sw */
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3004,
+			   DP_TX_ENCODER_4P_RESET_SW_DP_ENC0_P0,
+			   DP_TX_ENCODER_4P_RESET_SW_DP_ENC0_P0);
+
+	/* 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);
+}
+
+static void mtk_dp_digital_sw_reset(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_340C,
+			   DP_TX_TRANSMITTER_4P_RESET_SW_DP_TRANS_P0,
+			   DP_TX_TRANSMITTER_4P_RESET_SW_DP_TRANS_P0);
+
+	/* 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);
+}
+
+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 : DP_TRANS_DUMMY_RW_0,
+			   DP_TRANS_DUMMY_RW_0_MASK);
+	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 << 2, LANE_NUM_DP_TRANS_P0_MASK);
+}
+
+static void mtk_dp_get_calibration_data(struct mtk_dp *mtk_dp)
+{
+	const struct mtk_dp_efuse_fmt *fmt;
+	struct device *dev = mtk_dp->dev;
+	struct nvmem_cell *cell;
+	u32 *cal_data = mtk_dp->cal_data;
+	u32 *buf;
+	int i;
+	size_t len;
+
+	cell = nvmem_cell_get(dev, "dp_calibration_data");
+	if (IS_ERR(cell)) {
+		dev_warn(dev, "Failed to get nvmem cell dp_calibration_data\n");
+		goto use_default_val;
+	}
+
+	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");
+
+		if (!IS_ERR(buf))
+			kfree(buf);
+
+		goto use_default_val;
+	}
+
+	for (i = 0; i < MTK_DP_CAL_MAX; i++) {
+		fmt = &mtk_dp_efuse_data[i];
+		cal_data[i] = (buf[fmt->idx] >> fmt->shift) & fmt->mask;
+
+		if (cal_data[i] < fmt->min_val || cal_data[i] > fmt->max_val) {
+			dev_warn(mtk_dp->dev, "Invalid efuse data, idx = %d\n", i);
+			kfree(buf);
+			goto use_default_val;
+		}
+	}
+	kfree(buf);
+
+	return;
+
+use_default_val:
+	dev_warn(mtk_dp->dev, "Use default calibration data\n");
+	for (i = 0; i < MTK_DP_CAL_MAX; i++)
+		cal_data[i] = mtk_dp_efuse_data[i].default_val;
+}
+
+static void mtk_dp_set_calibration_data(struct mtk_dp *mtk_dp)
+{
+	u32 *cal_data = mtk_dp->cal_data;
+
+	mtk_dp_update_bits(mtk_dp, DP_PHY_GLB_DPAUX_TX,
+			   cal_data[MTK_DP_CAL_CLKTX_IMPSE] << 20,
+			   RG_CKM_PT0_CKTX_IMPSEL);
+	mtk_dp_update_bits(mtk_dp, DP_PHY_GLB_BIAS_GEN_00,
+			   cal_data[MTK_DP_CAL_GLB_BIAS_TRIM] << 16,
+			   RG_XTP_GLB_BIAS_INTR_CTRL);
+	mtk_dp_update_bits(mtk_dp, DP_PHY_LANE_TX_0,
+			   cal_data[MTK_DP_CAL_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[MTK_DP_CAL_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[MTK_DP_CAL_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[MTK_DP_CAL_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[MTK_DP_CAL_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[MTK_DP_CAL_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[MTK_DP_CAL_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[MTK_DP_CAL_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 = drm_dp_bw_code_to_link_rate(link_rate) / 100,
+			.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_calibration_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) << 12 : 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)
+{
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3000,
+			   ENHANCED_FRAME_EN_DP_ENC0_P0,
+			   ENHANCED_FRAME_EN_DP_ENC0_P0);
+}
+
+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)
+{
+	struct arm_smccc_res res;
+	u32 val = VIDEO_MUTE_SEL_DP_ENC0_P0 |
+		  (enable ? VIDEO_MUTE_SW_DP_ENC0_P0 : 0);
+
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3000,
+			   val,
+			   VIDEO_MUTE_SEL_DP_ENC0_P0 |
+			   VIDEO_MUTE_SW_DP_ENC0_P0);
+
+	arm_smccc_smc(MTK_DP_SIP_CONTROL_AARCH32,
+		      MTK_DP_SIP_ATF_EDP_VIDEO_UNMUTE, enable,
+		      0, 0, 0, 0, 0, &res);
+
+	dev_dbg(mtk_dp->dev, "smc cmd: 0x%x, p1: 0x%x, ret: 0x%lx-0x%lx\n",
+		MTK_DP_SIP_ATF_EDP_VIDEO_UNMUTE, enable, res.a0, res.a1);
+}
+
+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);
+	mtk_dp_write(mtk_dp, MTK_DP_1040,
+		     RG_DPAUX_RX_VALID_DEGLITCH_EN | RG_XTP_GLB_CKDET_EN |
+		     RG_DPAUX_RX_EN);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_0034, 0, DA_CKM_CKTX0_EN_FORCE_EN);
+}
+
+static void mtk_dp_power_disable(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_write(mtk_dp, MTK_DP_TOP_PWR_STATE, 0);
+
+	mtk_dp_update_bits(mtk_dp, MTK_DP_0034,
+			   DA_CKM_CKTX0_EN_FORCE_EN, DA_CKM_CKTX0_EN_FORCE_EN);
+
+	/* Disable RX */
+	mtk_dp_write(mtk_dp, MTK_DP_1040, 0);
+	mtk_dp_write(mtk_dp, MTK_DP_TOP_MEM_PD,
+		     0x550 | FUSE_SEL | MEM_ISO_EN);
+}
+
+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->info.format = DP_PIXELFORMAT_RGB;
+	memset(&mtk_dp->info.vm, 0, sizeof(struct videomode));
+}
+
+static void mtk_dp_setup_tu(struct mtk_dp *mtk_dp)
+{
+	u32 sram_read_start = min_t(u32, MTK_DP_TBC_BUF_READ_START_ADDR,
+				    mtk_dp->info.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_set_tx_out(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_setup_tu(mtk_dp);
+}
+
+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 void mtk_dp_pattern(struct mtk_dp *mtk_dp, bool is_tps1)
+{
+	int pattern;
+	unsigned int aux_offset;
+
+	if (is_tps1) {
+		pattern = 1;
+		aux_offset = DP_LINK_SCRAMBLING_DISABLE | DP_TRAINING_PATTERN_1;
+	} else {
+		aux_offset = mtk_dp->train_info.channel_eq_pattern;
+
+		switch (mtk_dp->train_info.channel_eq_pattern) {
+		case DP_TRAINING_PATTERN_4:
+			pattern = 4;
+			break;
+		case DP_TRAINING_PATTERN_3:
+			pattern = 3;
+			aux_offset |= DP_LINK_SCRAMBLING_DISABLE;
+			break;
+		case DP_TRAINING_PATTERN_2:
+		default:
+			pattern = 2;
+			aux_offset |= DP_LINK_SCRAMBLING_DISABLE;
+			break;
+		}
+	}
+
+	mtk_dp_train_set_pattern(mtk_dp, pattern);
+	drm_dp_dpcd_writeb(&mtk_dp->aux, DP_TRAINING_PATTERN_SET, aux_offset);
+}
+
+static int mtk_dp_train_setting(struct mtk_dp *mtk_dp, u8 target_link_rate,
+				u8 target_lane_count)
+{
+	int ret;
+
+	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);
+
+	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 ret;
+
+	dev_dbg(mtk_dp->dev,
+		"Link train target_link_rate = 0x%x, target_lane_count = 0x%x\n",
+		target_link_rate, target_lane_count);
+
+	return 0;
+}
+
+static int mtk_dp_train_cr(struct mtk_dp *mtk_dp, u8 target_lane_count)
+{
+	u8 lane_adjust[2] = {};
+	u8 link_status[DP_LINK_STATUS_SIZE] = {};
+	u8 prev_lane_adjust = 0xff;
+	int train_retries = 0;
+	int voltage_retries = 0;
+
+	mtk_dp_pattern(mtk_dp, true);
+
+	/* In DP spec 1.4, the retry count of CR is defined as 10. */
+	do {
+		train_retries++;
+		if (!mtk_dp->train_info.cable_plugged_in) {
+			mtk_dp_train_set_pattern(mtk_dp, 0);
+			return -ENODEV;
+		}
+
+		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);
+
+		drm_dp_link_train_clock_recovery_delay(&mtk_dp->aux,
+						       mtk_dp->rx_cap);
+
+		/* check link status from sink device */
+		drm_dp_dpcd_read_link_status(&mtk_dp->aux, link_status);
+		if (drm_dp_clock_recovery_ok(link_status,
+					     target_lane_count)) {
+			dev_dbg(mtk_dp->dev, "Link train CR pass\n");
+			return 0;
+		}
+
+		/*
+		 * In DP spec 1.4, if current voltage level is the same
+		 * with previous voltage level, we need to retry 5 times.
+		 */
+		if (prev_lane_adjust == link_status[4]) {
+			voltage_retries++;
+			/*
+			 * Condition of CR fail:
+			 * 1. Failed to pass CR using the same voltage
+			 *    level over five times.
+			 * 2. Failed to pass CR when the current voltage
+			 *    level is the same with previous voltage
+			 *    level and reach max voltage level (3).
+			 */
+			if (voltage_retries > MTK_DP_TRAIN_VOLTAGE_LEVEL_RETRY ||
+			    (prev_lane_adjust & DP_ADJUST_VOLTAGE_SWING_LANE0_MASK) == 3) {
+				dev_dbg(mtk_dp->dev, "Link train CR fail\n");
+				break;
+			}
+		} else {
+			/*
+			 * If the voltage level is changed, we need to
+			 * re-calculate this retry count.
+			 */
+			voltage_retries = 0;
+		}
+		prev_lane_adjust = link_status[4];
+	} while (train_retries < MTK_DP_TRAIN_DOWNSCALE_RETRY);
+
+	/* Failed to train CR, and disable pattern. */
+	drm_dp_dpcd_writeb(&mtk_dp->aux, DP_TRAINING_PATTERN_SET,
+			   DP_TRAINING_PATTERN_DISABLE);
+	mtk_dp_train_set_pattern(mtk_dp, 0);
+
+	return -ETIMEDOUT;
+}
+
+static int mtk_dp_train_eq(struct mtk_dp *mtk_dp, u8 target_lane_count)
+{
+	u8 lane_adjust[2] = {};
+	u8 link_status[DP_LINK_STATUS_SIZE] = {};
+	int train_retries = 0;
+
+	mtk_dp_pattern(mtk_dp, false);
+
+	do {
+		train_retries++;
+		if (!mtk_dp->train_info.cable_plugged_in) {
+			mtk_dp_train_set_pattern(mtk_dp, 0);
+			return -ENODEV;
+		}
+
+		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);
+
+		drm_dp_link_train_channel_eq_delay(&mtk_dp->aux,
+						   mtk_dp->rx_cap);
+
+		/* check link status from sink device */
+		drm_dp_dpcd_read_link_status(&mtk_dp->aux, link_status);
+		if (drm_dp_channel_eq_ok(link_status, target_lane_count)) {
+			dev_dbg(mtk_dp->dev, "Link train EQ pass\n");
+
+			/* Training done, and disable pattern. */
+			drm_dp_dpcd_writeb(&mtk_dp->aux, DP_TRAINING_PATTERN_SET,
+					   DP_TRAINING_PATTERN_DISABLE);
+			mtk_dp_train_set_pattern(mtk_dp, 0);
+			return 0;
+		}
+		dev_dbg(mtk_dp->dev, "Link train EQ fail\n");
+	} while (train_retries < MTK_DP_TRAIN_DOWNSCALE_RETRY);
+
+	/* Failed to train EQ, and disable pattern. */
+	drm_dp_dpcd_writeb(&mtk_dp->aux, DP_TRAINING_PATTERN_SET,
+			   DP_TRAINING_PATTERN_DISABLE);
+	mtk_dp_train_set_pattern(mtk_dp, 0);
+
+	return -ETIMEDOUT;
+}
+
+static int mtk_dp_parse_capabilities(struct mtk_dp *mtk_dp)
+{
+	u8 val;
+	ssize_t ret;
+
+	drm_dp_read_dpcd_caps(&mtk_dp->aux, mtk_dp->rx_cap);
+
+	if (drm_dp_tps4_supported(mtk_dp->rx_cap))
+		mtk_dp->train_info.channel_eq_pattern = DP_TRAINING_PATTERN_4;
+	else if (drm_dp_tps3_supported(mtk_dp->rx_cap))
+		mtk_dp->train_info.channel_eq_pattern = DP_TRAINING_PATTERN_3;
+	else
+		mtk_dp->train_info.channel_eq_pattern = DP_TRAINING_PATTERN_2;
+
+	mtk_dp->train_info.sink_ssc = drm_dp_max_downspread(mtk_dp->rx_cap);
+
+	ret = drm_dp_dpcd_readb(&mtk_dp->aux, DP_MSTM_CAP, &val);
+	if (ret < 1) {
+		drm_err(mtk_dp->drm_dev, "Read mstm cap failed\n");
+		return ret == 0 ? -EIO : ret;
+	}
+
+	if (val & DP_MST_CAP) {
+		/* Clear DP_DEVICE_SERVICE_IRQ_VECTOR_ESI0 */
+		ret = drm_dp_dpcd_readb(&mtk_dp->aux,
+					DP_DEVICE_SERVICE_IRQ_VECTOR_ESI0,
+					&val);
+		if (ret < 1) {
+			drm_err(mtk_dp->drm_dev, "Read irq vector failed\n");
+			return ret == 0 ? -EIO : ret;
+		}
+
+		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_training(struct mtk_dp *mtk_dp)
+{
+	int ret;
+	u8 lane_count, link_rate, train_limit, max_link_rate;
+
+	link_rate = min_t(u8, mtk_dp->max_linkrate,
+			  mtk_dp->rx_cap[DP_MAX_LINK_RATE]);
+	max_link_rate = link_rate;
+	lane_count = min_t(u8, mtk_dp->max_lanes,
+			   drm_dp_max_lane_count(mtk_dp->rx_cap));
+
+	/*
+	 * TPS are generated by the hardware pattern generator. From the
+	 * hardware setting we need to disable this scramble setting before
+	 * use the TPS pattern generator.
+	 */
+	mtk_dp_training_set_scramble(mtk_dp, false);
+
+	for (train_limit = 6; train_limit > 0; train_limit--) {
+		mtk_dp_train_change_mode(mtk_dp);
+
+		ret = mtk_dp_train_setting(mtk_dp, link_rate, lane_count);
+		if (ret)
+			return ret;
+
+		ret = mtk_dp_train_cr(mtk_dp, lane_count);
+		if (ret == -ENODEV) {
+			return ret;
+		} else if (ret) {
+			/* reduce link rate */
+			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;
+			};
+			continue;
+		}
+
+		ret = mtk_dp_train_eq(mtk_dp, lane_count);
+		if (ret == -ENODEV) {
+			return ret;
+		} else if (ret) {
+			/* reduce lane count */
+			if (lane_count == 0)
+				return -EIO;
+			lane_count /= 2;
+			continue;
+		}
+
+		/* if we can run to this, training is done. */
+		break;
+	}
+
+	if (train_limit == 0)
+		return -ETIMEDOUT;
+
+	mtk_dp->train_info.link_rate = link_rate;
+	mtk_dp->train_info.lane_count = lane_count;
+
+	/*
+	 * After training done, we need to output normal stream instead of TPS,
+	 * so we need to enable scramble.
+	 */
+	mtk_dp_training_set_scramble(mtk_dp, true);
+	mtk_dp_set_enhanced_frame_mode(mtk_dp);
+
+	return 0;
+}
+
+static void mtk_dp_video_enable(struct mtk_dp *mtk_dp, bool enable)
+{
+	/* the mute sequence is different between enable and disable */
+	if (enable) {
+		mtk_dp_msa_bypass_enable(mtk_dp, false);
+		mtk_dp_pg_enable(mtk_dp, false);
+		mtk_dp_set_tx_out(mtk_dp);
+		mtk_dp_video_mute(mtk_dp, false);
+	} else {
+		mtk_dp_video_mute(mtk_dp, true);
+		mtk_dp_pg_enable(mtk_dp, true);
+		mtk_dp_msa_bypass_enable(mtk_dp, true);
+	}
+}
+
+static int mtk_dp_video_config(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_config_mn_mode(mtk_dp);
+	mtk_dp_set_msa(mtk_dp);
+	mtk_dp_set_color_depth(mtk_dp);
+	return mtk_dp_set_color_format(mtk_dp, mtk_dp->info.format);
+}
+
+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,
+			   RX_REPLY_COMPLETE_MODE_AUX_TX_P0,
+			   RX_REPLY_COMPLETE_MODE_AUX_TX_P0);
+	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;
+	unsigned long flags;
+	u32 status;
+
+	spin_lock_irqsave(&mtk_dp->irq_thread_lock, flags);
+	status = mtk_dp->irq_thread_handle;
+	mtk_dp->irq_thread_handle = 0;
+	spin_unlock_irqrestore(&mtk_dp->irq_thread_lock, flags);
+
+	if (status & MTK_DP_THREAD_CABLE_STATE_CHG)
+		drm_helper_hpd_irq_event(mtk_dp->bridge.dev);
+
+	if (status & MTK_DP_THREAD_HPD_EVENT)
+		dev_dbg(mtk_dp->dev, "Receive IRQ from sink devices\n");
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t mtk_dp_hpd_event(int hpd, void *dev)
+{
+	struct mtk_dp *mtk_dp = dev;
+	bool cable_sta_chg = false;
+	unsigned long flags;
+	u32 irq_status = mtk_dp_swirq_get_clear(mtk_dp) |
+			 mtk_dp_hwirq_get_clear(mtk_dp);
+
+	if (!irq_status)
+		return IRQ_HANDLED;
+
+	spin_lock_irqsave(&mtk_dp->irq_thread_lock, flags);
+
+	if (irq_status & MTK_DP_HPD_INTERRUPT)
+		mtk_dp->irq_thread_handle |= MTK_DP_THREAD_HPD_EVENT;
+
+	/* Cable state is changed. */
+	if (irq_status != MTK_DP_HPD_INTERRUPT) {
+		mtk_dp->irq_thread_handle |= MTK_DP_THREAD_CABLE_STATE_CHG;
+		cable_sta_chg = true;
+	}
+
+	spin_unlock_irqrestore(&mtk_dp->irq_thread_lock, flags);
+
+	if (cable_sta_chg) {
+		if (!!(mtk_dp_read(mtk_dp, MTK_DP_TRANS_P0_3414) &
+		       HPD_DB_DP_TRANS_P0_MASK))
+			mtk_dp->train_info.cable_plugged_in = true;
+		else
+			mtk_dp->train_info.cable_plugged_in = false;
+	}
+
+	return IRQ_WAKE_THREAD;
+}
+
+static int mtk_dp_dt_parse(struct mtk_dp *mtk_dp,
+			   struct platform_device *pdev)
+{
+	struct device_node *endpoint;
+	struct device *dev = &pdev->dev;
+	int ret;
+	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);
+
+	endpoint = of_graph_get_endpoint_by_regs(pdev->dev.of_node, 1, -1);
+	len = of_property_count_elems_of_size(endpoint,
+					      "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;
+	}
+
+	mtk_dp->max_linkrate = drm_dp_link_rate_to_bw_code(linkrate * 100);
+
+	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);
+
+		/* power on aux */
+		mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
+				   DP_PWR_STATE_BANDGAP_TPLL_LANE,
+				   DP_PWR_STATE_MASK);
+
+		/* power on panel */
+		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);
+
+	/*
+	 * Parse capability here to let atomic_get_input_bus_fmts and
+	 * mode_valid use the capability to calculate sink bitrates.
+	 */
+	if (mtk_dp_parse_capabilities(mtk_dp)) {
+		drm_err(mtk_dp->drm_dev, "Can't parse capabilities\n");
+		new_edid = NULL;
+	}
+
+	if (!enabled) {
+		/* power off panel */
+		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D3);
+		usleep_range(2000, 3000);
+
+		/* power off aux */
+		mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
+				   DP_PWR_STATE_BANDGAP_TPLL,
+				   DP_PWR_STATE_MASK);
+
+		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;
+
+	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;
+	}
+
+	do {
+		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);
+			goto err;
+		}
+		accessed_bytes += to_access;
+	} while (accessed_bytes < msg->size);
+
+	msg->reply = DP_AUX_NATIVE_REPLY_ACK | DP_AUX_I2C_REPLY_ACK;
+	return msg->size;
+err:
+	msg->reply = DP_AUX_NATIVE_REPLY_NACK | DP_AUX_I2C_REPLY_NACK;
+	return ret;
+}
+
+static int mtk_dp_poweron(struct mtk_dp *mtk_dp)
+{
+	int ret;
+
+	ret = phy_init(mtk_dp->phy);
+	if (ret) {
+		dev_err(mtk_dp->dev, "Failed to initialize phy: %d\n", ret);
+		return ret;
+	}
+
+	mtk_dp_init_port(mtk_dp);
+	mtk_dp_power_enable(mtk_dp);
+
+	return 0;
+}
+
+static void mtk_dp_poweroff(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_power_disable(mtk_dp);
+	phy_exit(mtk_dp->phy);
+}
+
+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;
+		}
+	}
+
+	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_hwirq_enable(mtk_dp, false);
+	mtk_dp->drm_dev = NULL;
+	mtk_dp_poweroff(mtk_dp);
+	drm_dp_aux_unregister(&mtk_dp->aux);
+}
+
+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);
+	int ret;
+
+	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;
+	}
+
+	/* power on aux */
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
+			   DP_PWR_STATE_BANDGAP_TPLL_LANE,
+			   DP_PWR_STATE_MASK);
+
+	if (mtk_dp->train_info.cable_plugged_in) {
+		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
+		usleep_range(2000, 5000);
+	}
+
+	/* Training */
+	ret = mtk_dp_training(mtk_dp);
+	if (ret) {
+		drm_err(mtk_dp->drm_dev, "Training failed, %d\n", ret);
+		goto power_off_aux;
+	}
+
+	ret = mtk_dp_video_config(mtk_dp);
+	if (ret)
+		goto power_off_aux;
+
+	mtk_dp_video_enable(mtk_dp, true);
+
+	mtk_dp->enabled = true;
+
+	return;
+power_off_aux:
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
+			   DP_PWR_STATE_BANDGAP_TPLL,
+			   DP_PWR_STATE_MASK);
+}
+
+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;
+	mtk_dp_video_enable(mtk_dp, false);
+
+	if (mtk_dp->train_info.cable_plugged_in) {
+		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D3);
+		usleep_range(2000, 3000);
+	}
+
+	/* power off aux */
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
+			   DP_PWR_STATE_BANDGAP_TPLL,
+			   DP_PWR_STATE_MASK);
+
+	/* Ensure the sink is muted */
+	msleep(20);
+}
+
+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 bpp = info->color_formats & DRM_COLOR_FORMAT_YCBCR422 ? 16 : 24;
+	u32 rate = min_t(u32, drm_dp_max_link_rate(mtk_dp->rx_cap) *
+			      drm_dp_max_lane_count(mtk_dp->rx_cap),
+			 drm_dp_bw_code_to_link_rate(mtk_dp->max_linkrate) *
+			 mtk_dp->max_lanes);
+
+	if (rate < mode->clock * bpp / 8)
+		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 rate = min_t(u32, drm_dp_max_link_rate(mtk_dp->rx_cap) *
+			      drm_dp_max_lane_count(mtk_dp->rx_cap),
+			 drm_dp_bw_code_to_link_rate(mtk_dp->max_linkrate) *
+			 mtk_dp->max_lanes);
+
+	*num_input_fmts = 0;
+
+	/*
+	 * If the linkrate is smaller than datarate of RGB888, larger than
+	 * datarate of YUV422 and sink device supports YUV422, we output YUV422
+	 * format. Use this condition, we can support more resolution.
+	 */
+	if ((rate < (mode->clock * 24 / 8)) &&
+	    (rate > (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;
+	}
+
+	drm_display_mode_to_videomode(&crtc_state->adjusted_mode, &mtk_dp->info.vm);
+
+	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, irq_num;
+
+	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;
+
+	spin_lock_init(&mtk_dp->irq_thread_lock);
+
+	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, ret,
+				     "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);
+
+	pm_runtime_put(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+	drm_bridge_remove(&mtk_dp->bridge);
+	platform_device_unregister(mtk_dp->phy_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_platform_driver(mtk_dp_driver);
+
+MODULE_AUTHOR("Jitao Shi <jitao.shi@mediatek.com>");
+MODULE_AUTHOR("Markus Schneider-Pargmann <msp@baylibre.com>");
+MODULE_AUTHOR("Bo-Chen Chen <rex-bc.chen@mediatek.com>");
+MODULE_DESCRIPTION("MediaTek DisplayPort Driver");
+MODULE_LICENSE("GPL");