[PATCH v4 2/2] drm/bridge: Add ITE IT6162 MIPI DSI to HDMI bridge driver

[Hermes Wu via B4 Relay <devnull+Hermes.wu.ite.com.tw@kernel.org>]

From: Hermes Wu <Hermes.wu@ite.com.tw>

Add support for the ITE IT6162 MIPI DSI to HDMI 2.0 bridge chip.
The IT6162 is an I2C-controlled bridge that supports the following
configurations:

  - Single MIPI DSI input: up to 4K @ 30Hz
  - Dual MIPI DSI input (combined): up to 4K @ 60Hz

The driver implements the DRM bridge and connector frameworks,
including mode setting, EDID retrieval, and HPD support.

Also add a MAINTAINERS entry for the newly introduced ITE IT6162 MIPI DSI
to HDMI bridge driver, covering the driver source file and the
device tree binding document.

Signed-off-by: Hermes Wu <Hermes.wu@ite.com.tw>
---
Changes in v4
  * Drop struc it6162_audio
  * Add HDCP_AUTO in enum hdcp_ver{}, FW enable HDCP by sink capability.
  * Call drm_atomic_helper_connector_hdmi_clear_audio_infoframe()
    in it6162_bridge_hdmi_audio_shutdown()
  * Drop  it6162_bridge_hdmi_audio_startup()
  * Add hdmi_clear_hdmi_infoframe and hdmi_write_hdmi_infoframe
  * Drop it6162_parse_dt() due to "ite,support-hdcp" is removed from DT.
  * Add DRM_BRIDGE_OP_HDMI to it6162->bridge.ops

Changes in v3:
  * Fix OFFSET_VERSION_H register offset from 0x03 to 0x05
  * Add MIPI_PORT_EN_MASK macro combining MIPI_PORT1_EN_MASK and MIPI_PORT0_EN_MASK
  * Rename HDCP enums: NO_HDCP -> HDCP_DISABLE, NO_HDCP_STATE -> HDCP_STATE_IDLE,
    AUTH_DONE -> HDCP_STATE_AUTH_DONE, AUTH_FAIL -> HDCP_STATE_AUTH_FAIL
  * Rename it6162_infoblock_complete() to it6162_wait_command_complete()
  * Rename it6162_infoblock_host_set() to it6162_infoblock_trigger()
  * Remove it6162_infoblock_mipi_config() and it6162_infoblock_write_msg()
    wrappers, inline into it6162_reset_init() and
    it6162_mipi_set_video_timing() respectively
  * Remove it6162_set_default_config() wrapper, inline into
    it6162_reset_init()
  * Fix typo: hdcp_encyption -> hdcp_encryption
  * Fix typo: it6162_hdcp_read_infomation -> it6162_hdcp_read_information
  * Remove dev_err_probe() usage outside of probe path
  * Remove verbose success-path dev_info/dev_dbg logging throughout
  * Replace __func__ usage in error messages with descriptive strings
  * Fix double error printing in probe for it6162_init_pdata failure path
  * Fix uninitialized variable warning: initialize cp_status to
    DRM_MODE_CONTENT_PROTECTION_DESIRED at declaration; move
    drm_hdcp_update_content_protection() inside the state-change block
  * Fix audio sample width mapping: case 20 now maps to WORD_LENGTH_20BIT,
    case 24 to WORD_LENGTH_24BIT
  * Remove stray drm_dbg("it6162_bridge_atomic_disable") call
  * Remove drm_dbg() calls from it6162_display_mode_to_settings()
  * Drop unused struct it6162 * parameter from it6162_avi_to_video_setting()
    and it6162_display_mode_to_settings()
  * Fold it6162_set_default_config() body directly into it6162_reset_init(),
    removing the wrapper
  * Fix it6162_infoblock_request_data(): split command complete polling and
    buffer status check into two steps; use wait_event_timeout() for
    data_buf_sts since it is updated asynchronously by the interrupt
    handler; add wait_queue_head_t data_buf_wait to struct it6162 and
    wake_up() in interrupt handler
---
 MAINTAINERS                         |    7 +
 drivers/gpu/drm/bridge/Kconfig      |   17 +
 drivers/gpu/drm/bridge/Makefile     |    1 +
 drivers/gpu/drm/bridge/ite-it6162.c | 1628 +++++++++++++++++++++++++++++++++++
 4 files changed, 1653 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 30f3472c72933c93b9237d93ad35802d6dda75f1..9c6e7c02227e810f280d2bfaa73e0eb572db0119 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -13640,6 +13640,13 @@ W:	https://linuxtv.org
 Q:	http://patchwork.linuxtv.org/project/linux-media/list/
 F:	drivers/media/tuners/it913x*
 
+ITE IT6162 MIPI DSI TO HDMI BRIDGE DRIVER
+M:	Hermes Wu <Hermes.wu@ite.com.tw>
+L:	dri-devel@lists.freedesktop.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/display/bridge/ite,it6162.yaml
+F:	drivers/gpu/drm/bridge/ite-it6162.c
+
 ITE IT6263 LVDS TO HDMI BRIDGE DRIVER
 M:	Liu Ying <victor.liu@nxp.com>
 L:	dri-devel@lists.freedesktop.org
diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 1cabfa1d2b2efc6fca68619eea6050fe96a892e8..1a8fe59506cf60958babb48429b842ca3aecc755 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -107,6 +107,23 @@ config DRM_INNO_HDMI
 	select DRM_DISPLAY_HELPER
 	select DRM_KMS_HELPER
 
+config DRM_ITE_IT6162
+	tristate "iTE IT6162 DSI to HDMI bridge"
+	depends on OF
+	select REGMAP_I2C
+	select DRM_MIPI_DSI
+	select DRM_PANEL_BRIDGE
+	select DRM_KMS_HELPER
+	select DRM_HDMI_HELPER
+	select DRM_DISPLAY_HDMI_HELPER
+	select DRM_DISPLAY_HDCP_HELPER
+	select DRM_DISPLAY_HELPER
+	help
+	  Driver for iTE IT6162 DSI to HDMI bridge
+	  chip driver that converts DSI to HDMI signals
+	  support up to 4k60 with 2 MIPI DSI
+	  Please say Y if you have such hardware.
+
 config DRM_ITE_IT6263
 	tristate "ITE IT6263 LVDS/HDMI bridge"
 	depends on OF
diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
index fb0cf0bf88756bed8323830c80f3f1d066b51e36..3a199b27b3bbe8294a5bef6c82cfee4cd7b8a34e 100644
--- a/drivers/gpu/drm/bridge/Makefile
+++ b/drivers/gpu/drm/bridge/Makefile
@@ -11,6 +11,7 @@ tda998x-y := tda998x_drv.o
 obj-$(CONFIG_DRM_I2C_NXP_TDA998X) += tda998x.o
 
 obj-$(CONFIG_DRM_INNO_HDMI) += inno-hdmi.o
+obj-$(CONFIG_DRM_ITE_IT6162) += ite-it6162.o
 obj-$(CONFIG_DRM_ITE_IT6263) += ite-it6263.o
 obj-$(CONFIG_DRM_ITE_IT6505) += ite-it6505.o
 obj-$(CONFIG_DRM_LONTIUM_LT8912B) += lontium-lt8912b.o
diff --git a/drivers/gpu/drm/bridge/ite-it6162.c b/drivers/gpu/drm/bridge/ite-it6162.c
new file mode 100644
index 0000000000000000000000000000000000000000..09274468dc73f8fbe786dc983d9340c77b70ed48
--- /dev/null
+++ b/drivers/gpu/drm/bridge/ite-it6162.c
@@ -0,0 +1,1628 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2024 ITE Tech. Inc.
+ */
+#include <linux/bitfield.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_graph.h>
+#include <linux/of_irq.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <drm/display/drm_hdcp_helper.h>
+#include <drm/display/drm_hdmi_helper.h>
+#include <drm/display/drm_hdmi_state_helper.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_bridge_connector.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_of.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_print.h>
+#include <video/videomode.h>
+#include <sound/hdmi-codec.h>
+
+#define DATA_BUFFER_DEPTH 32
+
+#define OFFSET_CHIP_ID_L 0x00
+#define OFFSET_CHIP_ID_M 0x01
+#define OFFSET_CHIP_ID_H 0x02
+#define OFFSET_VERSION_L 0x03
+#define OFFSET_VERSION_M 0x04
+#define OFFSET_VERSION_H 0x05
+
+#define OFFSET_MIPI_CONFIG_L 0x06
+#define MIPI_CLOCK_MODE_MASK BIT(6)
+#define MIPI_PORT1_EN_MASK BIT(5)
+#define MIPI_PORT0_EN_MASK BIT(4)
+#define MIPI_LANE_SWAP_MASK BIT(3)
+#define MIPI_PN_SWAP_MASK BIT(2)
+#define MIPI_LANE_NUM_MASK 0x3
+#define MIPI_PORT_EN_MASK (MIPI_PORT1_EN_MASK | MIPI_PORT0_EN_MASK)
+
+#define OFFSET_MIPI_CONFIG_H 0x07
+#define OFFSET_TX_CONFIG 0x08
+
+#define OFFSET_TX_SETTING 0x09
+#define TX_HDCP_VER_MASK 0xC0
+#define TX_HDCP_ENCRYP_MASK BIT(5)
+#define TX_STREAM_TYPE_MASK BIT(4)
+
+#define OFFSET_MIPI_STATUS 0x0A
+#define OFFSET_TX_STATUS 0x0C
+#define B_TX_STATUS_HPD 7
+#define B_TX_STATUS_VIDEO_STB 6
+#define B_TX_STATUS_HDCP 4
+#define M_TX_STATUS_HDCP 0x30
+
+#define TX_VIDEO_STB BIT(B_TX_STATUS_VIDEO_STB)
+#define TX_STATUS_HPD BIT(B_TX_STATUS_HPD)
+
+#define GET_TX_HPD_STATUS(x) (((x) & TX_STATUS_HPD) >> B_TX_STATUS_HPD)
+#define GET_TX_VIDEO_STATUS(x) (((x) & TX_VIDEO_STB) >> B_TX_STATUS_VIDEO_STB)
+#define GET_TX_HDCP_STATUS(x) (((x) & M_TX_STATUS_HDCP) >> B_TX_STATUS_HDCP)
+
+#define OFFSET_SINK_CAP 0x0D
+#define B_SINK_CAP_HDCP_VER 4
+#define M_SINK_CAP_HDCP_VER 0x30
+
+#define GET_SINK_CAP_HDCP_VER(x) (((x) & M_SINK_CAP_HDCP_VER) >> B_SINK_CAP_HDCP_VER)
+
+#define OFFSET_DRIVER_DATA 0x0E
+
+#define OFFSET_DATA_TYPE_IDX 0x0F
+#define OFFSET_DATA_BUFFER 0x20
+
+#define OFFSET_AUDIO_CTRL0 0x3C
+#define MASK_AUDIO_CHANNEL_NUM 0x0F
+#define MASK_AUDIO_SELECT 0x30
+#define MASK_AUDIO_TYPE 0xC0
+
+#define OFFSET_AUDIO_CTRL1 0x3D
+#define OFFSET_AUDIO_CTRL2 0x3E
+#define MASK_I2S_BUS_MODE 0x1F
+#define MASK_I2S_WORD_LEN 0x60
+#define MASK_I2S_VALID 0x80
+
+#define OFFSET_HOST_SET 0xFE
+#define B_CONFIG_CHG BIT(7)
+#define B_SET_CHG BIT(6)
+#define HOST_SET_VIDEO_INFO (1)
+#define HOST_SET_AUDIO_INFO (2)
+#define HOST_SET_VIDEO_AUDIO_INFO (3)
+#define HOST_SET_EDID_R (0x04)
+#define HOST_SET_HDCP_R (0x05)
+#define HOST_SET_CEA_INFOFRAME (0x0E)
+
+#define OFFSET_EVENT_CHG 0xFF
+#define B_EVENT_CHG_BUFFER 4
+#define M_EVENT_CHG_BUFFER_STS (0x30)
+
+#define B_EVENT_CHG 1
+#define B_EVENT_IC_READY 0
+
+#define EVENT_CHG BIT(B_EVENT_CHG)
+#define EVENT_READY BIT(B_EVENT_IC_READY)
+
+#define GET_BUFFER_STATUS(x) (((x) & M_EVENT_CHG_BUFFER_STS) >> B_EVENT_CHG_BUFFER)
+
+#define TIMEOUT_INFOBLOCK_MS 1800
+
+enum it6162_audio_select {
+	I2S = 0,
+	SPDIF,
+};
+
+enum it6162_audio_word_length {
+	WORD_LENGTH_16BIT = 0x0,
+	WORD_LENGTH_18BIT = 0x1,
+	WORD_LENGTH_20BIT = 0x2,
+	WORD_LENGTH_24BIT = 0x3,
+};
+
+enum it6162_audio_sample_rate {
+	SAMPLE_RATE_32K = 0x3,
+	SAMPLE_RATE_48K = 0x2,
+	SAMPLE_RATE_64K = 0xB,
+	SAMPLE_RATE_96K = 0xA,
+	SAMPLE_RATE_192K = 0xE,
+	SAMPLE_RATE_44_1K = 0x0,
+	SAMPLE_RATE_88_2K = 0x8,
+	SAMPLE_RATE_176_4K = 0xC,
+};
+
+enum it6162_audio_type {
+	LPCM = 0,
+	NLPCM,
+};
+
+enum data_buf_sts {
+	NO_STS = 0x00,
+	BUF_READY = 0x01,
+	BUF_FAIL = 0x02,
+};
+
+enum hdcp_state {
+	HDCP_STATE_IDLE = 0x00,
+	HDCP_STATE_AUTH_DONE = 0x01,
+	HDCP_STATE_AUTH_FAIL = 0x02,
+};
+
+enum hdcp_ver {
+	HDCP_DISABLE = 0x0,
+	HDCP_14 = 0x1,
+	HDCP_23 = 0x2,
+	HDCP_AUTO = 0x3,
+};
+
+struct it6162_chip_info {
+	u32 chip_id;
+	u32 version;
+};
+
+struct it6162_video_settings {
+	u8 vic;
+	u32 clock;
+	u16 htotal;
+	u16 hfp;
+	u16 hsw;
+	u16 hbp;
+	u16 hdew;
+	u16 vtotal;
+	u16 vfp;
+	u16 vsw;
+	u16 vbp;
+	u16 vdew;
+	u8 hpol;
+	u8 vpol;
+	u8 prog;
+	u16 v_aspect;
+	u16 h_aspect;
+	u8 pix_rep;
+	u8 colorspace;
+};
+
+enum sync_mode {
+	SYNC_EVENT = 0x0,
+	SYNC_PULSE = 0x1,
+	SYNC_AUTO = 0x2,
+};
+
+struct it6162_mipi_cfg {
+	bool en_port[2];
+	u8 lane_num;
+	bool pn_swap;
+	bool lane_swap;
+	bool continuous_clk;
+	enum sync_mode mode;
+	enum mipi_dsi_pixel_format format;
+	unsigned long mode_flags;
+};
+
+struct it6162_hdcp_cfg {
+	enum hdcp_ver hdcp_version;
+	bool hdcp_encryption;
+	u8 stream_ID;
+};
+
+struct it6162_infoblock_msg {
+	u8 action;
+	int len;
+	u8 msg[32];
+};
+
+struct it6162 {
+	struct drm_bridge bridge;
+	struct device *dev;
+	struct drm_connector *connector;
+	enum drm_connector_status connector_status;
+	struct drm_device *drm;
+
+	struct i2c_client *it6162_i2c;
+	struct regmap *regmap;
+
+	struct regulator *pwr1833;
+	struct regulator *ovdd;
+	struct regulator *ivdd;
+	struct gpio_desc *gpiod_reset;
+
+	bool power_on;
+	bool en_hdcp;
+
+	/*lock the infoblock write setting and buffer access*/
+	struct mutex lock;
+
+	enum data_buf_sts data_buf_sts;
+	wait_queue_head_t data_buf_wait;
+
+	/* it6162 DSI RX related params */
+	struct mipi_dsi_device *dsi;
+	struct it6162_mipi_cfg mipi_cfg;
+
+	struct delayed_work hdcp_work;
+	enum hdcp_state hdcp_sts;
+	enum hdcp_ver hdcp_version;
+	struct it6162_hdcp_cfg hdcp_cfg;
+
+	unsigned int content_protection;
+};
+
+static struct it6162 *bridge_to_it6162(struct drm_bridge *bridge)
+{
+	return container_of(bridge, struct it6162, bridge);
+}
+
+static const struct regmap_config it6162_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = 0xff,
+	.cache_type = REGCACHE_NONE,
+};
+
+static inline int it6162_i2c_regmap_init(struct i2c_client *client,
+					 struct it6162 *it6162)
+{
+	it6162->it6162_i2c = client;
+	i2c_set_clientdata(client, it6162);
+	it6162->regmap = devm_regmap_init_i2c(it6162->it6162_i2c,
+					      &it6162_regmap_config);
+	if (IS_ERR(it6162->regmap))
+		return PTR_ERR(it6162->regmap);
+
+	return 0;
+}
+
+static int it6162_wait_command_complete(struct it6162 *it6162)
+{
+	struct device *dev = it6162->dev;
+	struct regmap *regmap = it6162->regmap;
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(regmap, OFFSET_HOST_SET, &val);
+	if (ret < 0) {
+		dev_err(dev, "read failed rx reg[0x%x]", OFFSET_HOST_SET);
+		return ret;
+	}
+	return val;
+}
+
+static int it6162_infoblock_trigger(struct it6162 *it6162, u8 setting)
+{
+	struct device *dev = it6162->dev;
+	int status;
+	int val;
+
+	regmap_write(it6162->regmap, OFFSET_HOST_SET, setting);
+	/* OFFSET_HOST_SET is cleared by firmware when the command is processed */
+	status = readx_poll_timeout(it6162_wait_command_complete, it6162, val,
+				    val <= 0, 50 * 1000,
+				    TIMEOUT_INFOBLOCK_MS * 1000);
+	if (status < 0 || val != 0) {
+		dev_err(dev, "infoblock command timeout: status=%d val=%d",
+			status, val);
+		return -ETIMEDOUT;
+	}
+
+	return 0;
+}
+
+static int it6162_infoblock_request_data(struct it6162 *it6162,
+					 u8 request_type, u8 index, u8 *buf)
+{
+	struct device *dev = it6162->dev;
+	int status;
+
+	it6162->data_buf_sts = NO_STS;
+	regmap_write(it6162->regmap, OFFSET_DATA_TYPE_IDX, index);
+	status = it6162_infoblock_trigger(it6162, request_type);
+	if (status < 0)
+		return status;
+	/* data_buf_sts is updated asynchronously by the interrupt handler */
+	if (wait_event_timeout(it6162->data_buf_wait,
+			       it6162->data_buf_sts != NO_STS,
+			       msecs_to_jiffies(TIMEOUT_INFOBLOCK_MS)) == 0) {
+		dev_err(dev, "timeout waiting for data buffer");
+		return -ETIMEDOUT;
+	}
+
+	if (it6162->data_buf_sts != BUF_READY) {
+		dev_err(dev, "data buffer not ready: sts=%d",
+			it6162->data_buf_sts);
+		return -EIO;
+	}
+
+	regmap_bulk_read(it6162->regmap, OFFSET_DATA_BUFFER, buf,
+			 DATA_BUFFER_DEPTH);
+	return 0;
+}
+
+static void it6162_mipi_disable(struct it6162 *it6162)
+{
+	guard(mutex)(&it6162->lock);
+	regmap_update_bits(it6162->regmap, OFFSET_MIPI_CONFIG_L,
+			   MIPI_PORT_EN_MASK, 0x00);
+	it6162_infoblock_trigger(it6162, B_CONFIG_CHG);
+}
+
+static void it6162_mipi_enable(struct it6162 *it6162)
+{
+	unsigned int cfg_val = 0;
+
+	cfg_val = FIELD_PREP(MIPI_PORT1_EN_MASK, it6162->mipi_cfg.en_port[1]) |
+		  FIELD_PREP(MIPI_PORT0_EN_MASK, it6162->mipi_cfg.en_port[0]);
+
+	guard(mutex)(&it6162->lock);
+	regmap_update_bits(it6162->regmap, OFFSET_MIPI_CONFIG_L,
+			   MIPI_PORT_EN_MASK, cfg_val);
+	it6162_infoblock_trigger(it6162, B_CONFIG_CHG);
+}
+
+static void it6162_tx_hdcp_enable(struct it6162 *it6162,
+				  struct it6162_hdcp_cfg *tx_out)
+{
+	int val;
+	struct regmap *regmap = it6162->regmap;
+
+	guard(mutex)(&it6162->lock);
+	it6162->hdcp_sts = HDCP_STATE_IDLE;
+
+	regmap_read(regmap, OFFSET_TX_SETTING, &val);
+	val &= 0x0F;
+	val |= FIELD_PREP(TX_HDCP_VER_MASK, tx_out->hdcp_version) |
+	       FIELD_PREP(TX_HDCP_ENCRYP_MASK, tx_out->hdcp_encryption) |
+	       FIELD_PREP(TX_STREAM_TYPE_MASK, tx_out->stream_ID);
+
+	regmap_write(regmap, OFFSET_TX_SETTING, val);
+	it6162_infoblock_trigger(it6162, B_SET_CHG);
+}
+
+static void it6162_tx_hdcp_disable(struct it6162 *it6162)
+{
+	int val;
+	struct regmap *regmap = it6162->regmap;
+
+	it6162->hdcp_sts = HDCP_STATE_IDLE;
+	it6162->hdcp_version = HDCP_DISABLE;
+
+	guard(mutex)(&it6162->lock);
+	regmap_read(regmap, OFFSET_TX_SETTING, &val);
+	regmap_write(it6162->regmap, OFFSET_TX_SETTING, val & 0x0F);
+	it6162_infoblock_trigger(it6162, B_SET_CHG);
+}
+
+static void
+it6162_tx_hdcp_setup(struct it6162 *it6162, u8 ver, bool encryption)
+{
+	struct it6162_hdcp_cfg tx_out;
+
+	if (ver != HDCP_DISABLE) {
+		tx_out.hdcp_version = ver;
+		tx_out.hdcp_encryption = encryption;
+		tx_out.stream_ID = 0;
+		it6162_tx_hdcp_enable(it6162, &tx_out);
+	} else {
+		it6162_tx_hdcp_disable(it6162);
+	}
+}
+
+static void it6162_tx_enable(struct it6162 *it6162)
+{
+	if (it6162->en_hdcp)
+		it6162->hdcp_version = it6162->hdcp_cfg.hdcp_version;
+	else
+		it6162->hdcp_version = HDCP_DISABLE;
+}
+
+static void it6162_tx_disable(struct it6162 *it6162)
+{
+	cancel_delayed_work_sync(&it6162->hdcp_work);
+	it6162_tx_hdcp_setup(it6162, HDCP_DISABLE, false);
+}
+
+static inline void
+it6162_pack_video_setting(struct it6162 *it6162,
+			  struct it6162_video_settings *settings,
+			  struct it6162_infoblock_msg *msg)
+{
+	msg->msg[0x00] = settings->hdew & 0xFF;
+	msg->msg[0x01] = (settings->hdew >> 8) & 0x3F;
+	msg->msg[0x02] = settings->vdew & 0xFF;
+	msg->msg[0x03] = (settings->vdew >> 8) & 0x3F;
+	msg->msg[0x04] = settings->clock  & 0xFF;
+	msg->msg[0x05] = (settings->clock >> 8) & 0xFF;
+	msg->msg[0x06] = (settings->clock >> 16) & 0xFF;
+	msg->msg[0x07] = (settings->clock >> 24) & 0xFF;
+	msg->msg[0x08] = settings->hfp & 0xFF;
+	msg->msg[0x09] = (settings->hfp >> 8) & 0x3F;
+	msg->msg[0x0A] = settings->hsw & 0xFF;
+	msg->msg[0x0B] = (settings->hsw >> 8) & 0x3F;
+	msg->msg[0x0C] = settings->hbp & 0xFF;
+	msg->msg[0x0D] = (settings->hbp >> 8) & 0x3F;
+	msg->msg[0x0E] = settings->vfp & 0xFF;
+	msg->msg[0x0F] = (settings->vfp >> 8) & 0x3F;
+	msg->msg[0x10] = settings->vsw & 0xFF;
+	msg->msg[0x11] = (settings->vsw >> 8) & 0x3F;
+	msg->msg[0x12] = settings->vbp & 0xFF;
+	msg->msg[0x13] = (settings->vbp >> 8) & 0x3F;
+	msg->msg[0x14] = (settings->prog << 2) |
+			 (settings->vpol << 1) |
+			  settings->hpol;
+
+	msg->msg[0x15] = settings->v_aspect;
+	msg->msg[0x16] = settings->h_aspect & 0xFF;
+	msg->msg[0x17] = settings->h_aspect >> 8;
+	msg->msg[0x18] = settings->pix_rep;
+	msg->msg[0x19] = settings->vic;
+	msg->msg[0x1A] = settings->colorspace;
+	msg->msg[0x1B] = 1;
+
+	msg->len = 0x1C;
+	msg->action = HOST_SET_VIDEO_INFO;
+}
+
+static void it6162_mipi_set_video_timing(struct it6162 *it6162,
+					 struct it6162_video_settings *mode)
+{
+	struct it6162_infoblock_msg msg;
+
+	it6162_pack_video_setting(it6162, mode, &msg);
+	guard(mutex)(&it6162->lock);
+	regmap_bulk_write(it6162->regmap, OFFSET_DATA_BUFFER, &msg.msg,
+			  msg.len);
+	it6162_infoblock_trigger(it6162, msg.action);
+}
+
+static int
+it6162_hdcp_read_information(struct it6162 *it6162, u8 *status, u8 *bksv)
+{
+	u8 buf[DATA_BUFFER_DEPTH];
+	int ret;
+
+	guard(mutex)(&it6162->lock);
+	ret = it6162_infoblock_request_data(it6162, HOST_SET_HDCP_R, 0x00,
+					    buf);
+	if (ret < 0)
+		return ret;
+
+	memcpy(status, buf, 2);
+	memcpy(bksv, buf + 2, 5);
+	return 0;
+}
+
+static int it6162_hdcp_read_list(struct it6162 *it6162,
+				 u8 *ksv_list,
+				 int dev_count)
+{
+	u8 buf[DATA_BUFFER_DEPTH];
+	int i, j, ret;
+
+	if (!ksv_list || dev_count <= 0)
+		return -EINVAL;
+
+	guard(mutex)(&it6162->lock);
+	for (i = 0; i < (dev_count / 6 + 1); i++) {
+		ret = it6162_infoblock_request_data(it6162, HOST_SET_HDCP_R,
+						    i + 1, buf);
+		if (ret < 0)
+			return ret;
+
+		for (j = 0; j < 30; j += 5) {
+			if ((i * 6 + j / 5) >= dev_count)
+				break;
+
+			memcpy(&ksv_list[(i * 6 + j / 5) * 5], &buf[j], 5);
+		}
+	}
+	return dev_count;
+}
+
+static void it6162_update_hdcp14(struct it6162 *it6162)
+{
+	struct drm_device *drm = it6162->drm;
+	int dev_count;
+	u8 bksv[5];
+	u8 bstatus[2];
+	u8 ksvlist[5 * 30];
+	int ret;
+
+	ret = it6162_hdcp_read_information(it6162, bstatus, bksv);
+	if (ret < 0) {
+		drm_err(drm, "fail to read Bstatus");
+		return;
+	}
+
+	dev_count = DRM_HDCP_NUM_DOWNSTREAM(bstatus[0]);
+	if (dev_count == 0)
+		return;
+
+	if (DRM_HDCP_MAX_DEVICE_EXCEEDED(bstatus[0]) ||
+	    DRM_HDCP_MAX_CASCADE_EXCEEDED(bstatus[1])) {
+		drm_err(drm, "HDCP1.4 Max Topology Limit Exceeded");
+		return;
+	}
+
+	dev_count = dev_count > 30 ? 30 : dev_count;
+	ret = it6162_hdcp_read_list(it6162, ksvlist, dev_count);
+	if (ret < 0) {
+		drm_err(drm, "fail to read KSV list");
+		return;
+	}
+}
+
+static void it6162_update_hdcp23(struct it6162 *it6162)
+{
+	struct drm_device *drm = it6162->drm;
+	int dev_count;
+	u8 rxid[5];
+	u8 rxinfo[2];
+	u8 rxid_list[5 * 30];
+	int ret;
+
+	ret = it6162_hdcp_read_information(it6162, rxinfo, rxid);
+	if (ret < 0) {
+		drm_err(drm, "fail to read Rxinfo");
+		return;
+	}
+
+	dev_count = (HDCP_2_2_DEV_COUNT_HI(rxinfo[0]) << 4 |
+		     HDCP_2_2_DEV_COUNT_LO(rxinfo[1]));
+	if (dev_count == 0)
+		return;
+
+	if (HDCP_2_2_MAX_CASCADE_EXCEEDED(rxinfo[1]) ||
+	    HDCP_2_2_MAX_DEVS_EXCEEDED(rxinfo[1])) {
+		drm_err(drm, "HDCP2.3 Topology Max Size Exceeded");
+		return;
+	}
+
+	dev_count = dev_count > 30 ? 30 : dev_count;
+	ret = it6162_hdcp_read_list(it6162, rxid_list, dev_count);
+	if (ret < 0) {
+		drm_err(drm, "fail to read RxID list");
+		return;
+	}
+}
+
+static void it6162_update_hdcp(struct it6162 *it6162, u8 version)
+{
+	if (version == HDCP_23)
+		it6162_update_hdcp23(it6162);
+	else
+		it6162_update_hdcp14(it6162);
+}
+
+static void it6162_hdcp_handler(struct it6162 *it6162)
+{
+	struct regmap *regmap = it6162->regmap;
+	unsigned int tx_status, sink_cap;
+	enum hdcp_state hdcp_sts;
+	struct it6162_hdcp_cfg *hdcp_cfg = &it6162->hdcp_cfg;
+	u8 hdcp_ver;
+	u64 cp_status = DRM_MODE_CONTENT_PROTECTION_DESIRED;
+
+	if (hdcp_cfg->hdcp_version == HDCP_DISABLE || !it6162->en_hdcp)
+		return;
+
+	if (it6162->hdcp_version != HDCP_DISABLE) {
+		regmap_read(regmap, OFFSET_TX_STATUS, &tx_status);
+		regmap_read(regmap, OFFSET_SINK_CAP, &sink_cap);
+		if (!GET_TX_VIDEO_STATUS(tx_status)) {
+			drm_dbg(it6162->drm, "video not stable, skip hdcp check");
+			return;
+		}
+
+		hdcp_sts = GET_TX_HDCP_STATUS(tx_status);
+		hdcp_ver = GET_SINK_CAP_HDCP_VER(sink_cap);
+		if (it6162->hdcp_sts != hdcp_sts ||
+		    it6162->hdcp_sts == HDCP_STATE_IDLE) {
+			it6162->hdcp_sts = hdcp_sts;
+			switch (hdcp_sts) {
+			case HDCP_STATE_AUTH_DONE:
+				it6162_update_hdcp(it6162, hdcp_ver);
+				cp_status = DRM_MODE_CONTENT_PROTECTION_ENABLED;
+				break;
+			case HDCP_STATE_AUTH_FAIL:
+				if (hdcp_ver == HDCP_23)
+					it6162_tx_hdcp_setup(it6162, HDCP_14,
+							     true);
+				else
+					it6162_tx_hdcp_disable(it6162);
+
+				break;
+			default:
+				it6162_tx_hdcp_setup(it6162,
+						     it6162->hdcp_version,
+						     true);
+				break;
+			}
+			drm_hdcp_update_content_protection(it6162->connector,
+							   cp_status);
+		}
+	}
+}
+
+static void it6162_interrupt_handler(struct it6162 *it6162)
+{
+	unsigned int int_status, tx_status;
+	enum drm_connector_status connector_status;
+	struct device *dev = it6162->dev;
+	struct regmap *regmap = it6162->regmap;
+	int err;
+
+	err = regmap_read(regmap, OFFSET_EVENT_CHG, &int_status);
+	if (err < 0) {
+		dev_err(dev, "read failed rx reg[0x%x] err: %d",
+			OFFSET_EVENT_CHG, err);
+		return;
+	}
+
+	regmap_write(it6162->regmap, OFFSET_EVENT_CHG, 0xFF);
+
+	if (!!GET_BUFFER_STATUS(int_status)) {
+		regmap_write(it6162->regmap, OFFSET_DRIVER_DATA, int_status);
+		it6162->data_buf_sts = GET_BUFFER_STATUS(int_status);
+		wake_up(&it6162->data_buf_wait);
+	}
+
+	if (!(int_status & EVENT_CHG))
+		return;
+
+	err = regmap_read(regmap, OFFSET_TX_STATUS, &tx_status);
+	if (err < 0) {
+		dev_err(dev, "read failed rx reg[0x%x] err: %d",
+			OFFSET_TX_STATUS, err);
+		return;
+	}
+
+	connector_status = GET_TX_HPD_STATUS(tx_status) ?
+			   connector_status_connected :
+			   connector_status_disconnected;
+
+	if (it6162->connector_status != connector_status) {
+		it6162->connector_status = connector_status;
+		drm_bridge_hpd_notify(&it6162->bridge,
+				      it6162->connector_status);
+	}
+
+	if (it6162->en_hdcp && GET_TX_VIDEO_STATUS(tx_status) &&
+	    connector_status == connector_status_connected)
+		queue_delayed_work(system_wq, &it6162->hdcp_work,
+				   msecs_to_jiffies(2000));
+}
+
+static int it6162_wait_ready_event(struct it6162 *it6162)
+{
+	unsigned int val;
+	int ret;
+	struct device *dev = it6162->dev;
+	struct regmap *regmap = it6162->regmap;
+
+	ret = regmap_read(regmap, OFFSET_EVENT_CHG, &val);
+	if (ret < 0) {
+		dev_err(dev, "read failed rx reg[0x%x] err: %d",
+			OFFSET_EVENT_CHG, ret);
+		return ret;
+	}
+
+	return val & EVENT_READY;
+}
+
+static bool it6162_wait_mcu_ready(struct it6162 *it6162)
+{
+	int ret, val;
+
+	ret = readx_poll_timeout(it6162_wait_ready_event, it6162, val,
+				 val == EVENT_READY, 100 * 1000, 1500 * 1000);
+	if (ret) {
+		dev_err(it6162->dev, "timeout waiting for MCU ready");
+		return false;
+	}
+
+	return true;
+}
+
+static void it6162_reset_init(struct it6162 *it6162)
+{
+	struct it6162_mipi_cfg *cfg = &it6162->mipi_cfg;
+	u8 cfg_val = 0;
+
+	cfg_val = FIELD_PREP(MIPI_CLOCK_MODE_MASK, cfg->continuous_clk) |
+		  FIELD_PREP(MIPI_LANE_SWAP_MASK, cfg->lane_swap) |
+		  FIELD_PREP(MIPI_PN_SWAP_MASK, cfg->pn_swap) |
+		  FIELD_PREP(MIPI_LANE_NUM_MASK, cfg->lane_num - 1);
+
+	guard(mutex)(&it6162->lock);
+	regmap_write(it6162->regmap, OFFSET_MIPI_CONFIG_L, cfg_val);
+	regmap_write(it6162->regmap, OFFSET_MIPI_CONFIG_H, cfg->mode);
+	regmap_write(it6162->regmap, OFFSET_TX_CONFIG, 0x00);
+	regmap_write(it6162->regmap, OFFSET_TX_SETTING, 0x00);
+	it6162_infoblock_trigger(it6162, B_CONFIG_CHG | B_SET_CHG);
+}
+
+static int it6162_platform_set_power(struct it6162 *it6162)
+{
+	int err;
+
+	err = regulator_enable(it6162->ivdd);
+	if (err)
+		return err;
+
+	err = regulator_enable(it6162->pwr1833);
+	if (err)
+		return err;
+
+	err = regulator_enable(it6162->ovdd);
+	if (err)
+		return err;
+
+	usleep_range(10000, 20000);
+	gpiod_set_value_cansleep(it6162->gpiod_reset, 1);
+	usleep_range(1000, 2000);
+	gpiod_set_value_cansleep(it6162->gpiod_reset, 0);
+	usleep_range(10000, 20000);
+
+	return 0;
+}
+
+static int it6162_platform_clear_power(struct it6162 *it6162)
+{
+	int err;
+
+	err = regulator_disable(it6162->ivdd);
+	if (err)
+		return err;
+
+	usleep_range(2000, 3000);
+
+	err = regulator_disable(it6162->pwr1833);
+	if (err)
+		return err;
+
+	err = regulator_disable(it6162->ovdd);
+	if (err)
+		return err;
+
+	return 0;
+}
+
+static int it6162_detect_devices(struct it6162 *it6162)
+{
+	struct device *dev = it6162->dev;
+	const struct it6162_chip_info *chip_info;
+	u32 chip_id, version;
+	u8 buf[6];
+
+	if (it6162_platform_set_power(it6162) < 0)
+		return -ENODEV;
+
+	/* Firmware must finish booting before register access is valid */
+	if (!it6162_wait_mcu_ready(it6162))
+		return -ENODEV;
+
+	chip_info = of_device_get_match_data(dev);
+	regmap_bulk_read(it6162->regmap, OFFSET_CHIP_ID_L, &buf[0], 6);
+	chip_id = (buf[0] << 16) | (buf[1] << 8) | (buf[2]);
+	version = (buf[3] << 16) | (buf[4] << 8) | (buf[5]);
+	if (chip_id == chip_info->chip_id && version >= chip_info->version)
+		return 0;
+
+	dev_err(dev, "chip mismatch: id=0x%06x ver=0x%06x", chip_id, version);
+	return -ENODEV;
+}
+
+static int __maybe_unused it6162_poweron(struct it6162 *it6162)
+{
+	int err;
+
+	err = it6162_platform_set_power(it6162);
+	if (err < 0)
+		return err;
+
+	if (!it6162_wait_mcu_ready(it6162))
+		return -ENODEV;
+
+	it6162->connector_status = connector_status_disconnected;
+	it6162_reset_init(it6162);
+	enable_irq(it6162->it6162_i2c->irq);
+	it6162->power_on = true;
+	return 0;
+}
+
+static int __maybe_unused it6162_poweroff(struct it6162 *it6162)
+{
+	int err;
+
+	disable_irq(it6162->it6162_i2c->irq);
+	err = it6162_platform_clear_power(it6162);
+	if (err < 0)
+		return err;
+
+	it6162->power_on = false;
+	return 0;
+}
+
+static void it6162_config_default(struct it6162 *it6162)
+{
+	struct it6162_mipi_cfg *mipi_cfg = &it6162->mipi_cfg;
+	struct it6162_hdcp_cfg *hdcp_cfg = &it6162->hdcp_cfg;
+
+	mipi_cfg->lane_num = 4;
+	mipi_cfg->pn_swap = false;
+	mipi_cfg->lane_swap = false;
+	mipi_cfg->en_port[0] = false;
+	mipi_cfg->en_port[1] = false;
+	mipi_cfg->continuous_clk = true;
+	mipi_cfg->mode = SYNC_EVENT;
+	mipi_cfg->format = MIPI_DSI_FMT_RGB888;
+	mipi_cfg->mode_flags = MIPI_DSI_MODE_VIDEO;
+
+	it6162->en_hdcp = false;
+	hdcp_cfg->hdcp_version = HDCP_AUTO;
+	hdcp_cfg->hdcp_encryption = true;
+	hdcp_cfg->stream_ID = 0;
+
+	it6162->connector_status = connector_status_disconnected;
+}
+
+static enum drm_connector_status it6162_detect(struct it6162 *it6162)
+{
+	struct regmap *regmap = it6162->regmap;
+	unsigned int tx_status;
+
+	regmap_read(regmap, OFFSET_TX_STATUS, &tx_status);
+	it6162->connector_status = GET_TX_HPD_STATUS(tx_status) ?
+				   connector_status_connected :
+				   connector_status_disconnected;
+	return it6162->connector_status;
+}
+
+static int it6162_get_edid_block(void *data, u8 *buf, unsigned int block,
+				 size_t len)
+{
+	struct it6162 *it6162 = data;
+	unsigned int i, cnt;
+	int ret;
+	u8 config;
+
+	if (len > EDID_LENGTH)
+		return -EINVAL;
+
+	guard(mutex)(&it6162->lock);
+	for (i = 0, cnt = 0; i < EDID_LENGTH; i += DATA_BUFFER_DEPTH, cnt++) {
+		config = (block << 2) | (cnt);
+		ret = it6162_infoblock_request_data(it6162, HOST_SET_EDID_R,
+						    config, buf + i);
+		if (ret < 0)
+			return -EIO;
+	}
+
+	return 0;
+}
+
+static int it6162_audio_update_hw_params(struct it6162 *it6162,
+					 struct hdmi_codec_daifmt *fmt,
+					 struct hdmi_codec_params *hparms)
+{
+	enum it6162_audio_select select;
+	enum it6162_audio_sample_rate sample_rate;
+	unsigned int sample_width;
+	unsigned int val;
+
+	switch (hparms->sample_rate) {
+	case 32000:
+		sample_rate = SAMPLE_RATE_32K;
+		break;
+	case 44100:
+		sample_rate = SAMPLE_RATE_44_1K;
+		break;
+	case 48000:
+		sample_rate = SAMPLE_RATE_48K;
+		break;
+	case 88200:
+		sample_rate = SAMPLE_RATE_88_2K;
+		break;
+	case 96000:
+		sample_rate = SAMPLE_RATE_96K;
+		break;
+	case 176400:
+		sample_rate = SAMPLE_RATE_176_4K;
+		break;
+	case 192000:
+		sample_rate = SAMPLE_RATE_192K;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	switch (hparms->sample_width) {
+	case 16:
+		sample_width = WORD_LENGTH_16BIT;
+		break;
+	case 18:
+		sample_width = WORD_LENGTH_18BIT;
+		break;
+	case 20:
+		sample_width = WORD_LENGTH_20BIT;
+		break;
+	case 24:
+		sample_width = WORD_LENGTH_24BIT;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	switch (fmt->fmt) {
+	case HDMI_I2S:
+		select = I2S;
+		break;
+	case HDMI_SPDIF:
+		select = SPDIF;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	guard(mutex)(&it6162->lock);
+	val = FIELD_PREP(MASK_AUDIO_CHANNEL_NUM, hparms->channels) |
+	      FIELD_PREP(MASK_AUDIO_SELECT, select) |
+	      FIELD_PREP(MASK_AUDIO_TYPE, LPCM);
+	regmap_write(it6162->regmap, OFFSET_AUDIO_CTRL0, val);
+	regmap_write(it6162->regmap, OFFSET_AUDIO_CTRL1, sample_rate);
+
+	val = FIELD_PREP(MASK_I2S_BUS_MODE, 0) |
+	      FIELD_PREP(MASK_I2S_WORD_LEN, sample_width) |
+	      FIELD_PREP(MASK_I2S_VALID, 1);
+	regmap_write(it6162->regmap, OFFSET_AUDIO_CTRL2, val);
+	return it6162_infoblock_trigger(it6162, HOST_SET_AUDIO_INFO);
+}
+
+static void it6162_disable_audio(struct it6162 *it6162)
+{
+	guard(mutex)(&it6162->lock);
+	regmap_write(it6162->regmap, OFFSET_AUDIO_CTRL0, 0x00);
+	regmap_write(it6162->regmap, OFFSET_AUDIO_CTRL1, 0x00);
+	regmap_write(it6162->regmap, OFFSET_AUDIO_CTRL2, 0x00);
+	it6162_infoblock_trigger(it6162, HOST_SET_AUDIO_INFO);
+}
+
+static irqreturn_t it6162_int_threaded_handler(int unused, void *data)
+{
+	struct it6162 *it6162 = data;
+
+	it6162_interrupt_handler(it6162);
+	return IRQ_HANDLED;
+}
+
+static void it6162_hdcp_work(struct work_struct *work)
+{
+	struct it6162 *it6162 = container_of(work, struct it6162,
+					     hdcp_work.work);
+
+	it6162_hdcp_handler(it6162);
+}
+
+static struct mipi_dsi_host *
+it6162_of_get_dsi_host_by_port(struct it6162 *it6162, int port)
+{
+	struct device_node *of = it6162->dev->of_node;
+	struct device_node *host_node;
+	struct device_node *endpoint;
+	struct mipi_dsi_host *dsi_host;
+
+	endpoint = of_graph_get_endpoint_by_regs(of, port, -1);
+	if (!endpoint)
+		return ERR_PTR(-ENODEV);
+
+	host_node = of_graph_get_remote_port_parent(endpoint);
+	of_node_put(endpoint);
+	if (!host_node)
+		return ERR_PTR(-ENODEV);
+
+	dsi_host = of_find_mipi_dsi_host_by_node(host_node);
+	of_node_put(host_node);
+	if (!dsi_host)
+		return ERR_PTR(-EPROBE_DEFER);
+
+	return dsi_host;
+}
+
+static int it6162_of_get_dsi_host(struct it6162 *it6162)
+{
+	struct mipi_dsi_host *dsi_host;
+	int port, host_count = 0;
+
+	for (port = 0; port < 2; port++) {
+		dsi_host = it6162_of_get_dsi_host_by_port(it6162, port);
+		if (IS_ERR(dsi_host)) {
+			if (PTR_ERR(dsi_host) == -EPROBE_DEFER)
+				return -EPROBE_DEFER;
+			continue;
+		}
+
+		host_count++;
+	}
+
+	return host_count == 0 ? -ENODEV : 0;
+}
+
+static int it6162_load_mipi_pars_from_port(struct it6162 *it6162, int port)
+{
+	struct device_node *of = it6162->dev->of_node;
+	struct device_node *endpoint;
+	struct it6162_mipi_cfg *mipicfg = &it6162->mipi_cfg;
+	u32 data_lanes[4] = {1};
+	u32 lane_polarities[5] = {0};
+	int dsi_lanes;
+
+	endpoint = of_graph_get_endpoint_by_regs(of, port, -1);
+	if (!endpoint)
+		return 0;
+
+	dsi_lanes = drm_of_get_data_lanes_count(endpoint, 1, 4);
+	if (dsi_lanes < 0)
+		return dsi_lanes;
+
+	mipicfg->lane_num = dsi_lanes;
+
+	of_property_read_u32_array(endpoint, "data-lanes", data_lanes,
+				   dsi_lanes);
+	/* only supports full reversal of all lanes, not arbitrary remapping */
+	if (data_lanes[0] == 3)
+		mipicfg->lane_swap  = true;
+
+	of_property_read_u32_array(endpoint, "lane-polarities",
+				   lane_polarities, dsi_lanes + 1);
+	/* applies Dp/Dn swap globally; mixing polarities across lanes is invalid */
+	if (lane_polarities[0] != 0)
+		mipicfg->pn_swap = true;
+
+	if (of_property_present(endpoint, "clock-noncontinuous")) {
+		mipicfg->mode_flags |= MIPI_DSI_CLOCK_NON_CONTINUOUS;
+		mipicfg->continuous_clk = false;
+	}
+
+	of_node_put(endpoint);
+	return dsi_lanes;
+}
+
+static int it6162_attach_dsi(struct it6162 *it6162)
+{
+	struct device *dev = it6162->dev;
+	struct device_node *np = dev->of_node;
+	const struct mipi_dsi_device_info info = {"it6162-mipi", 0, np};
+	struct mipi_dsi_device *dsi;
+	struct mipi_dsi_host *host;
+	struct it6162_mipi_cfg *mipi_cfg = &it6162->mipi_cfg;
+	int ret = 0;
+
+	it6162->dsi = NULL;
+	for (int port = 0; port < 2; port++) {
+		host = it6162_of_get_dsi_host_by_port(it6162, port);
+		if (IS_ERR(host))
+			continue;
+
+		mipi_cfg->en_port[port] = true;
+
+		dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
+		if (IS_ERR(dsi)) {
+			dev_err(dev, "failed to create dsi device");
+			return PTR_ERR(dsi);
+		}
+		/* uses a single DSI configuration for both ports in dual-link mode */
+		if (!it6162->dsi) {
+			ret = it6162_load_mipi_pars_from_port(it6162, port);
+			if (ret <= 0)
+				return ret;
+			it6162->dsi = dsi;
+		}
+
+		dsi->lanes = mipi_cfg->lane_num;
+		dsi->format = mipi_cfg->format;
+		dsi->mode_flags = mipi_cfg->mode_flags;
+		ret = devm_mipi_dsi_attach(dev, dsi);
+		if (ret) {
+			dev_err(dev, "failed to attach dsi device %d", port);
+			return ret;
+		}
+	}
+
+	it6162_poweron(it6162);
+	return 0;
+}
+
+static bool it6162_of_get_audio(struct it6162 *it6162)
+{
+	struct device_node *np = it6162->dev->of_node;
+	struct device_node *audio_port;
+
+	audio_port = of_graph_get_port_by_id(np, 2);
+	if (audio_port) {
+		of_node_put(audio_port);
+		return true;
+	}
+
+	return false;
+}
+
+static int it6162_init_pdata(struct it6162 *it6162)
+{
+	struct device *dev = it6162->dev;
+
+	it6162->ivdd = devm_regulator_get(dev, "ivdd");
+	if (IS_ERR(it6162->ivdd))
+		return dev_err_probe(dev, PTR_ERR(it6162->ivdd),
+				     "failed to get ivdd regulator");
+
+	it6162->pwr1833 = devm_regulator_get(dev, "ovdd1833");
+	if (IS_ERR(it6162->pwr1833))
+		return dev_err_probe(dev, PTR_ERR(it6162->pwr1833),
+				     "failed to get ovdd1833 regulator");
+
+	it6162->ovdd = devm_regulator_get(dev, "ovdd");
+	if (IS_ERR(it6162->ovdd))
+		return dev_err_probe(dev, PTR_ERR(it6162->ovdd),
+				     "failed to get ovdd regulator");
+
+	it6162->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(it6162->gpiod_reset))
+		return dev_err_probe(dev, PTR_ERR(it6162->gpiod_reset),
+				     "failed to get reset gpio\n");
+
+	return 0;
+}
+
+static int it6162_bridge_attach(struct drm_bridge *bridge,
+				struct drm_encoder *encoder,
+				enum drm_bridge_attach_flags flags)
+{
+	struct it6162 *it6162 = bridge_to_it6162(bridge);
+	struct drm_device *drm = bridge->dev;
+
+	it6162->drm = drm;
+	if (!drm_core_check_feature(drm, DRIVER_ATOMIC)) {
+		drm_dbg(drm, "it6162 driver only copes with atomic updates");
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static enum drm_mode_status
+it6162_bridge_mode_valid(struct drm_bridge *bridge,
+			 const struct drm_display_info *info,
+			 const struct drm_display_mode *mode)
+{
+	unsigned long long rate;
+
+	rate = drm_hdmi_compute_mode_clock(mode, 8, HDMI_COLORSPACE_RGB);
+	if (rate == 0)
+		return MODE_NOCLOCK;
+
+	return bridge->funcs->hdmi_tmds_char_rate_valid(bridge, mode, rate);
+}
+
+static enum drm_connector_status
+it6162_bridge_detect(struct drm_bridge *bridge,
+		     struct drm_connector *connector)
+{
+	struct it6162 *it6162 = bridge_to_it6162(bridge);
+
+	return it6162->power_on ? it6162_detect(it6162) :
+				connector_status_disconnected;
+}
+
+static inline void
+it6162_avi_to_video_setting(struct hdmi_avi_infoframe *avi_info,
+			    struct it6162_video_settings *video)
+{
+	video->vic = avi_info->video_code;
+
+	switch (avi_info->picture_aspect) {
+	case HDMI_PICTURE_ASPECT_4_3:
+		video->h_aspect = 4;
+		video->v_aspect = 3;
+		break;
+	case HDMI_PICTURE_ASPECT_16_9:
+		video->h_aspect = 16;
+		video->v_aspect = 9;
+		break;
+	case HDMI_PICTURE_ASPECT_64_27:
+		video->h_aspect = 64;
+		video->v_aspect = 27;
+		break;
+	case HDMI_PICTURE_ASPECT_256_135:
+		video->h_aspect = 256;
+		video->v_aspect = 135;
+		break;
+	default:
+		video->h_aspect = 4;
+		video->v_aspect = 3;
+		break;
+	}
+
+	video->pix_rep = avi_info->pixel_repeat + 1;
+}
+
+static inline void
+it6162_display_mode_to_settings(struct drm_display_mode *mode,
+				struct it6162_video_settings *settings)
+{
+	if (mode->flags & DRM_MODE_FLAG_PHSYNC)
+		settings->hpol = 1;
+
+	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
+		settings->vpol = 1;
+
+	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
+		settings->prog = 0;
+
+	settings->clock = mode->clock;
+	settings->hdew = mode->hdisplay;
+	settings->hfp = mode->hsync_start - mode->hdisplay;
+	settings->hsw = mode->hsync_end - mode->hsync_start;
+	settings->hbp = mode->htotal - mode->hsync_end;
+	settings->htotal = mode->htotal;
+	settings->vdew = mode->vdisplay;
+	settings->vfp = mode->vsync_start - mode->vdisplay;
+	settings->vsw = mode->vsync_end - mode->vsync_start;
+	settings->vbp = mode->vtotal - mode->vsync_end;
+	settings->vtotal = mode->vtotal;
+}
+
+static void it6162_bridge_atomic_enable(struct drm_bridge *bridge,
+					struct drm_atomic_state *state)
+{
+	struct it6162 *it6162 = bridge_to_it6162(bridge);
+	struct drm_crtc_state *crtc_state;
+	struct drm_connector_state *conn_state;
+	struct drm_connector *connector;
+	struct hdmi_avi_infoframe *avi;
+	struct it6162_video_settings video_setting;
+
+	connector = drm_atomic_get_new_connector_for_encoder(state,
+							     bridge->encoder);
+	if (!connector)
+		return;
+
+	conn_state = drm_atomic_get_new_connector_state(state, connector);
+	if (!conn_state)
+		return;
+
+	crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
+	if (!crtc_state)
+		return;
+
+	it6162->connector = connector;
+	it6162->content_protection = conn_state->content_protection;
+
+	drm_atomic_helper_connector_hdmi_update_infoframes(connector, state);
+	avi = &conn_state->hdmi.infoframes.avi.data.avi;
+	video_setting.colorspace = conn_state->hdmi.output_format;
+	it6162_avi_to_video_setting(avi, &video_setting);
+	it6162_display_mode_to_settings(&crtc_state->mode, &video_setting);
+
+	it6162_mipi_set_video_timing(it6162, &video_setting);
+	it6162_tx_enable(it6162);
+	it6162_mipi_enable(it6162);
+}
+
+static int it6162_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 drm_display_mode *adj = &crtc_state->adjusted_mode;
+	struct drm_display_mode *mode = &crtc_state->mode;
+	struct it6162 *it6162 = bridge_to_it6162(bridge);
+	u32 hfp, hsw, hbp;
+	u32 clock;
+	u32 hfp_check;
+
+	clock = mode->clock;
+	hfp = mode->hsync_start - mode->hdisplay;
+	hsw = mode->hsync_end - mode->hsync_start;
+	hbp = mode->htotal - mode->hsync_end;
+
+	hfp_check = DIV_ROUND_UP(65 * clock, 1000000) + 4;
+	if (hfp >= hfp_check)
+		return 0;
+
+	if (hbp > hfp_check - hfp) {
+		adj->hsync_start = adj->hdisplay + hfp_check;
+		adj->hsync_end = adj->hsync_start + hsw;
+		drm_dbg(it6162->drm, "adjusted hsync on MIPI bus: %u, %u",
+			adj->hsync_start, adj->hsync_end);
+	}
+
+	return 0;
+}
+
+static void it6162_bridge_atomic_disable(struct drm_bridge *bridge,
+					 struct drm_atomic_state *state)
+{
+	struct it6162 *it6162 = bridge_to_it6162(bridge);
+
+	it6162_tx_disable(it6162);
+	it6162_mipi_disable(it6162);
+}
+
+static const struct drm_edid *
+it6162_bridge_read_edid(struct drm_bridge *bridge,
+			struct drm_connector *connector)
+{
+	struct it6162 *it6162 = bridge_to_it6162(bridge);
+
+	return drm_edid_read_custom(connector, it6162_get_edid_block, it6162);
+}
+
+static int it6162_bridge_hdmi_audio_prepare(struct drm_bridge *bridge,
+					    struct drm_connector *connector,
+					    struct hdmi_codec_daifmt *fmt,
+					    struct hdmi_codec_params *params)
+{
+	struct it6162 *it6162 = bridge_to_it6162(bridge);
+	int ret;
+
+	ret = it6162_audio_update_hw_params(it6162, fmt, params);
+	if (ret < 0)
+		return ret;
+
+	return drm_atomic_helper_connector_hdmi_update_audio_infoframe(connector,
+								       &params->cea);
+}
+
+static void it6162_bridge_hdmi_audio_shutdown(struct drm_bridge *bridge,
+					      struct drm_connector *connector)
+{
+	struct it6162 *it6162 = bridge_to_it6162(bridge);
+
+	drm_atomic_helper_connector_hdmi_clear_audio_infoframe(connector);
+	it6162_disable_audio(it6162);
+}
+
+static enum drm_mode_status
+it6162_hdmi_tmds_char_rate_valid(const struct drm_bridge *bridge,
+				 const struct drm_display_mode *mode,
+				 unsigned long long tmds_rate)
+{
+	/*IT6162 hdmi supports HDMI2.0 600Mhz*/
+	if (tmds_rate > 600000000)
+		return MODE_CLOCK_HIGH;
+
+	return MODE_OK;
+}
+
+static inline int
+it6162_write_infoframe(struct it6162 *it6162, const u8 *buffer, size_t len)
+{
+	if (len > DATA_BUFFER_DEPTH)
+		return -EINVAL;
+
+	regmap_bulk_write(it6162->regmap, OFFSET_DATA_BUFFER, buffer, len);
+	regmap_write(it6162->regmap, OFFSET_DATA_TYPE_IDX, len);
+	it6162_infoblock_trigger(it6162, HOST_SET_CEA_INFOFRAME);
+	return 0;
+}
+
+static inline int it6162_clear_infoframe(struct it6162 *it6162, u8 type)
+{
+	regmap_write(it6162->regmap, OFFSET_DATA_TYPE_IDX, 3);
+	regmap_write(it6162->regmap, OFFSET_DATA_BUFFER, type);
+	regmap_write(it6162->regmap, OFFSET_DATA_BUFFER + 1, 0x00);
+	regmap_write(it6162->regmap, OFFSET_DATA_BUFFER + 2, 0x00);
+	it6162_infoblock_trigger(it6162, HOST_SET_CEA_INFOFRAME);
+	return 0;
+}
+
+static int
+it6162_bridge_hdmi_write_avi_infoframe(struct drm_bridge *bridge,
+				       const u8 *buffer, size_t len)
+{
+	struct it6162 *it6162 = bridge_to_it6162(bridge);
+
+	return it6162_write_infoframe(it6162, buffer, len);
+}
+
+static int
+it6162_bridge_hdmi_clear_avi_infoframe(struct drm_bridge *bridge)
+{
+	struct it6162 *it6162 = bridge_to_it6162(bridge);
+
+	return it6162_clear_infoframe(it6162, HDMI_INFOFRAME_TYPE_AVI);
+}
+
+static int
+it6162_bridge_hdmi_write_audio_infoframe(struct drm_bridge *bridge,
+					 const u8 *buffer, size_t len)
+{
+	struct it6162 *it6162 = bridge_to_it6162(bridge);
+
+	return it6162_write_infoframe(it6162, buffer, len);
+}
+
+static int
+it6162_bridge_hdmi_clear_audio_infoframe(struct drm_bridge *bridge)
+{
+	struct it6162 *it6162 = bridge_to_it6162(bridge);
+
+	return it6162_clear_infoframe(it6162, HDMI_INFOFRAME_TYPE_AUDIO);
+}
+
+static int
+it6162_bridge_hdmi_write_spd_infoframe(struct drm_bridge *bridge,
+				       const u8 *buffer, size_t len)
+{
+	struct it6162 *it6162 = bridge_to_it6162(bridge);
+
+	return it6162_write_infoframe(it6162, buffer, len);
+}
+
+static int
+it6162_bridge_hdmi_clear_spd_infoframe(struct drm_bridge *bridge)
+{
+	struct it6162 *it6162 = bridge_to_it6162(bridge);
+
+	return it6162_clear_infoframe(it6162, HDMI_INFOFRAME_TYPE_SPD);
+}
+
+static int
+it6162_bridge_hdmi_write_hdmi_infoframe(struct drm_bridge *bridge,
+					const u8 *buffer, size_t len)
+{
+	struct it6162 *it6162 = bridge_to_it6162(bridge);
+
+	return it6162_write_infoframe(it6162, buffer, len);
+}
+
+static int
+it6162_bridge_hdmi_clear_hdmi_infoframe(struct drm_bridge *bridge)
+{
+	struct it6162 *it6162 = bridge_to_it6162(bridge);
+
+	return it6162_clear_infoframe(it6162, HDMI_INFOFRAME_TYPE_VENDOR);
+}
+
+static const struct drm_bridge_funcs it6162_bridge_funcs = {
+	.attach = it6162_bridge_attach,
+	.mode_valid = it6162_bridge_mode_valid,
+	.detect = it6162_bridge_detect,
+
+	.atomic_enable = it6162_bridge_atomic_enable,
+	.atomic_disable = it6162_bridge_atomic_disable,
+	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
+	.atomic_reset = drm_atomic_helper_bridge_reset,
+	.atomic_check = it6162_bridge_atomic_check,
+
+	.edid_read = it6162_bridge_read_edid,
+
+	.hdmi_clear_hdmi_infoframe = it6162_bridge_hdmi_clear_hdmi_infoframe,
+	.hdmi_write_hdmi_infoframe = it6162_bridge_hdmi_write_hdmi_infoframe,
+	.hdmi_clear_avi_infoframe = it6162_bridge_hdmi_clear_avi_infoframe,
+	.hdmi_write_avi_infoframe = it6162_bridge_hdmi_write_avi_infoframe,
+	.hdmi_clear_spd_infoframe = it6162_bridge_hdmi_clear_spd_infoframe,
+	.hdmi_write_spd_infoframe = it6162_bridge_hdmi_write_spd_infoframe,
+	.hdmi_clear_audio_infoframe = it6162_bridge_hdmi_clear_audio_infoframe,
+	.hdmi_write_audio_infoframe = it6162_bridge_hdmi_write_audio_infoframe,
+
+	.hdmi_tmds_char_rate_valid = it6162_hdmi_tmds_char_rate_valid,
+	.hdmi_audio_prepare = it6162_bridge_hdmi_audio_prepare,
+	.hdmi_audio_shutdown = it6162_bridge_hdmi_audio_shutdown,
+};
+
+static int it6162_probe(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	struct device_node *np = dev->of_node;
+	struct it6162 *it6162;
+	int ret;
+
+	it6162 = devm_drm_bridge_alloc(dev, struct it6162, bridge,
+				       &it6162_bridge_funcs);
+	if (IS_ERR(it6162))
+		return PTR_ERR(it6162);
+
+	it6162->dev = dev;
+
+	ret = it6162_of_get_dsi_host(it6162);
+	if (ret < 0)
+		return ret;
+
+	ret = it6162_i2c_regmap_init(client, it6162);
+	if (ret != 0)
+		return ret;
+
+	ret = it6162_init_pdata(it6162);
+	if (ret)
+		return ret;
+
+	it6162_config_default(it6162);
+
+	if (it6162_detect_devices(it6162) < 0)
+		return -ENODEV;
+
+	if (!client->irq) {
+		dev_err(dev, "Failed to get INTP IRQ");
+		return -ENODEV;
+	}
+
+	ret = devm_request_threaded_irq(&client->dev, client->irq, NULL,
+					it6162_int_threaded_handler,
+					IRQF_TRIGGER_LOW | IRQF_ONESHOT |
+					IRQF_NO_AUTOEN,
+					"it6162-intp", it6162);
+	if (ret)
+		return ret;
+
+	INIT_DELAYED_WORK(&it6162->hdcp_work, it6162_hdcp_work);
+	init_waitqueue_head(&it6162->data_buf_wait);
+
+	mutex_init(&it6162->lock);
+
+	it6162->bridge.of_node = np;
+	it6162->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID |
+			     DRM_BRIDGE_OP_HDMI | DRM_BRIDGE_OP_MODES;
+
+	it6162->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
+
+	it6162->bridge.vendor = "ITE";
+	it6162->bridge.product = "IT6162";
+
+	if (it6162_of_get_audio(it6162)) {
+		it6162->bridge.ops |= DRM_BRIDGE_OP_HDMI_AUDIO;
+		it6162->bridge.hdmi_audio_dev = dev;
+		it6162->bridge.hdmi_audio_max_i2s_playback_channels = 8;
+		it6162->bridge.hdmi_audio_dai_port = 2;
+	}
+
+	devm_drm_bridge_add(dev, &it6162->bridge);
+
+	return it6162_attach_dsi(it6162);
+}
+
+static void it6162_remove(struct i2c_client *client)
+{
+	struct it6162 *it6162 = i2c_get_clientdata(client);
+
+	disable_irq(client->irq);
+	cancel_delayed_work_sync(&it6162->hdcp_work);
+	mutex_destroy(&it6162->lock);
+}
+
+static const struct it6162_chip_info it6162_chip_info = {
+	.chip_id = 0x616200,
+	.version = 0x006500,
+};
+
+static const struct of_device_id it6162_dt_ids[] = {
+	{ .compatible = "ite,it6162", .data = &it6162_chip_info},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, it6162_dt_ids);
+
+static const struct i2c_device_id it6162_i2c_ids[] = {
+	{ "it6162", 0 },
+	{ },
+};
+MODULE_DEVICE_TABLE(i2c, it6162_i2c_ids);
+
+static struct i2c_driver it6162_driver = {
+	.driver = {
+		.name = "it6162",
+		.of_match_table = it6162_dt_ids,
+	},
+	.probe = it6162_probe,
+	.remove = it6162_remove,
+	.id_table = it6162_i2c_ids,
+};
+module_i2c_driver(it6162_driver);
+
+MODULE_AUTHOR("Pet Weng <pet.weng@ite.com.tw>");
+MODULE_AUTHOR("Hermes Wu <Hermes.Wu@ite.com.tw>");
+MODULE_DESCRIPTION("it6162 MIPI to HDMI driver");
+MODULE_LICENSE("GPL");

-- 
2.34.1