Re: [PATCH v7] drm/bridge: add it6505 driver

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Hey Allen,

Sorry about the slow reviewing, let's have a look at this driver.

Running 'checkpatch --strict' reveals a few checks and warnings that
should be fixed.

On Fri, 16 Jul 2021 at 09:38, allen <allen.chen@xxxxxxxxxx> wrote:
>
> This adds support for the iTE IT6505.
> This device can convert DPI signal to DP output.
>
> From: Allen Chen <allen.chen@xxxxxxxxxx>
> Tested-by: Hsin-yi Wang <hsinyi@xxxxxxxxxxxx>
> Signed-off-by: Hermes Wu <hermes.wu@xxxxxxxxxx>
> Signed-off-by: Allen Chen <allen.chen@xxxxxxxxxx>
> ---

I would like to see a changelog between patch submission versions
here. It really makes reviewers' lives easier. 'git send-email
--annotate' is what you want to use.

>  drivers/gpu/drm/bridge/Kconfig      |    7 +
>  drivers/gpu/drm/bridge/Makefile     |    1 +
>  drivers/gpu/drm/bridge/ite-it6505.c | 3300 +++++++++++++++++++++++++++
>  3 files changed, 3308 insertions(+)
>  create mode 100644 drivers/gpu/drm/bridge/ite-it6505.c
>
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index 85b673613687d..f009ea5bd4047 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -74,6 +74,13 @@ config DRM_DISPLAY_CONNECTOR
>           on ARM-based platforms. Saying Y here when this driver is not needed
>           will not cause any issue.
>
> +config DRM_ITE_IT6505
> +        tristate "ITE IT6505 DisplayPort bridge"
> +        depends on OF
> +        select DRM_KMS_HELPER

There is a dependency on EXTCON, which should be reflected with 'select EXTCON'.

> +        help
> +          ITE IT6505 DisplayPort bridge chip driver.
> +
>  config DRM_LONTIUM_LT8912B
>         tristate "Lontium LT8912B DSI/HDMI bridge"
>         depends on OF
> diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
> index f2c73683cfcb7..425844c304953 100644
> --- a/drivers/gpu/drm/bridge/Makefile
> +++ b/drivers/gpu/drm/bridge/Makefile
> @@ -4,6 +4,7 @@ obj-$(CONFIG_DRM_CHIPONE_ICN6211) += chipone-icn6211.o
>  obj-$(CONFIG_DRM_CHRONTEL_CH7033) += chrontel-ch7033.o
>  obj-$(CONFIG_DRM_CROS_EC_ANX7688) += cros-ec-anx7688.o
>  obj-$(CONFIG_DRM_DISPLAY_CONNECTOR) += display-connector.o
> +obj-$(CONFIG_DRM_ITE_IT6505) += ite-it6505.o
>  obj-$(CONFIG_DRM_LONTIUM_LT8912B) += lontium-lt8912b.o
>  obj-$(CONFIG_DRM_LONTIUM_LT9611) += lontium-lt9611.o
>  obj-$(CONFIG_DRM_LONTIUM_LT9611UXC) += lontium-lt9611uxc.o
> diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
> new file mode 100644
> index 0000000000000..593472096c8a6
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/ite-it6505.c
> @@ -0,0 +1,3300 @@
> +// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +/*
> + * Copyright (c) 2020, The Linux Foundation. All rights reserved.
> + */
> +#include <linux/bits.h>
> +#include <linux/delay.h>
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/extcon.h>
> +#include <linux/fs.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/types.h>
> +#include <linux/wait.h>
> +
> +#include <crypto/hash.h>
> +
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_bridge.h>
> +#include <drm/drm_crtc.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_dp_helper.h>
> +#include <drm/drm_edid.h>
> +#include <drm/drm_hdcp.h>
> +#include <drm/drm_print.h>
> +#include <drm/drm_probe_helper.h>
> +
> +#include <sound/hdmi-codec.h>
> +
> +#define REG_IC_VER 0x04
> +
> +#define REG_RESET_CTRL 0x05
> +#define VIDEO_RESET BIT(0)
> +#define AUDIO_RESET BIT(1)
> +#define ALL_LOGIC_RESET BIT(2)
> +#define AUX_RESET BIT(3)
> +#define HDCP_RESET BIT(4)
> +
> +#define INT_STATUS_01 0x06
> +#define INT_MASK_01 0x09
> +#define INT_HPD_CHANGE 0
> +#define INT_RECEIVE_HPD_IRQ 1
> +#define INT_SCDT_CHANGE 2
> +#define INT_HDCP_FAIL 3
> +#define INT_HDCP_DONE 4
> +#define BIT_OFFSET(x) ((x - INT_STATUS_01) * BITS_PER_BYTE)
> +#define BIT_INT_HPD INT_HPD_CHANGE
> +#define BIT_INT_HPD_IRQ INT_RECEIVE_HPD_IRQ
> +#define BIT_INT_SCDT INT_SCDT_CHANGE
> +#define BIT_INT_HDCP_FAIL INT_HDCP_FAIL
> +#define BIT_INT_HDCP_DONE INT_HDCP_DONE
> +
> +#define INT_STATUS_02 0x07
> +#define INT_MASK_02 0x0A
> +#define INT_AUX_CMD_FAIL 0
> +#define INT_HDCP_KSV_CHECK 1
> +#define INT_AUDIO_FIFO_ERROR 2
> +#define BIT_INT_AUX_CMD_FAIL (BIT_OFFSET(0x07) + INT_AUX_CMD_FAIL)
> +#define BIT_INT_HDCP_KSV_CHECK (BIT_OFFSET(0x07) + INT_HDCP_KSV_CHECK)
> +#define BIT_INT_AUDIO_FIFO_ERROR (BIT_OFFSET(0x07) + INT_AUDIO_FIFO_ERROR)
> +
> +#define INT_STATUS_03 0x08
> +#define INT_MASK_03 0x0B
> +#define INT_LINK_TRAIN_FAIL 4
> +#define INT_VID_FIFO_ERROR 5
> +#define INT_IO_LATCH_FIFO_OVERFLOW 7
> +#define BIT_INT_LINK_TRAIN_FAIL (BIT_OFFSET(0x08) + INT_LINK_TRAIN_FAIL)
> +#define BIT_INT_VID_FIFO_ERROR (BIT_OFFSET(0x08) + INT_VID_FIFO_ERROR)
> +#define BIT_INT_IO_FIFO_OVERFLOW (BIT_OFFSET(0x08) + INT_IO_LATCH_FIFO_OVERFLOW)
> +
> +#define REG_SYSTEM_STS 0x0D
> +#define INT_STS BIT(0)
> +#define HPD_STS BIT(1)
> +#define VIDEO_STB BIT(2)
> +
> +#define REG_LINK_TRAIN_STS 0x0E
> +#define LINK_STATE_CR BIT(2)
> +#define LINK_STATE_EQ BIT(3)
> +#define LINK_STATE_NORP BIT(4)
> +
> +#define REG_BANK_SEL 0x0F
> +#define REG_CLK_CTRL0 0x10
> +#define M_PCLK_DELAY 0x03
> +
> +#define REG_AUX_OPT 0x11
> +#define AUX_AUTO_RST BIT(0)
> +#define AUX_FIX_FREQ BIT(3)
> +
> +#define REG_DATA_CTRL0 0x12
> +#define VIDEO_LATCH_EDGE BIT(4)
> +#define ENABLE_PCLK_COUNTER BIT(7)
> +
> +#define REG_PCLK_COUNTER_VALUE 0x13
> +
> +#define REG_501_FIFO_CTRL 0x15
> +#define RST_501_FIFO BIT(1)
> +
> +#define REG_TRAIN_CTRL0 0x16
> +#define FORCE_LBR BIT(0)
> +#define LANE_COUNT_MASK 0x06
> +#define LANE_SWAP BIT(3)
> +#define SPREAD_AMP_5 BIT(4)
> +#define FORCE_CR_DONE BIT(5)
> +#define FORCE_EQ_DONE BIT(6)
> +
> +#define REG_TRAIN_CTRL1 0x17
> +#define AUTO_TRAIN BIT(0)
> +#define MANUAL_TRAIN BIT(1)
> +#define FORCE_RETRAIN BIT(2)
> +
> +#define REG_AUX_CTRL 0x23
> +#define CLR_EDID_FIFO BIT(0)
> +#define AUX_USER_MODE BIT(1)
> +#define AUX_NO_SEGMENT_WR BIT(6)
> +#define AUX_EN_FIFO_READ BIT(7)
> +
> +#define REG_AUX_ADR_0_7 0x24
> +#define REG_AUX_ADR_8_15 0x25
> +#define REG_AUX_ADR_16_19 0x26
> +#define REG_AUX_OUT_DATA0 0x27
> +
> +#define REG_AUX_CMD_REQ 0x2B
> +#define AUX_BUSY BIT(5)
> +
> +#define REG_AUX_DATA_0_7 0x2C
> +#define REG_AUX_DATA_8_15 0x2D
> +#define REG_AUX_DATA_16_23 0x2E
> +#define REG_AUX_DATA_24_31 0x2F
> +
> +#define REG_AUX_DATA_FIFO 0x2F
> +
> +#define REG_AUX_ERROR_STS 0x9F
> +#define M_AUX_REQ_FAIL 0x03
> +
> +#define REG_HDCP_CTRL1 0x38
> +#define HDCP_CP_ENABLE BIT(0)
> +
> +#define REG_HDCP_TRIGGER 0x39
> +#define HDCP_TRIGGER_START  BIT(0)
> +#define HDCP_TRIGGER_CPIRQ  BIT(1)
> +#define HDCP_TRIGGER_KSV_DONE  BIT(4)
> +#define HDCP_TRIGGER_KSV_FAIL BIT(5)
> +
> +#define REG_HDCP_CTRL2 0x3A
> +#define HDCP_AN_SEL BIT(0)
> +#define HDCP_AN_GEN BIT(1)
> +#define HDCP_HW_HPDIRQ_ACT BIT(2)
> +#define HDCP_EN_M0_READ BIT(5)
> +
> +#define REG_M0_0_7 0x4C
> +#define REG_AN_0_7 0x4C
> +#define REG_SP_CTRL0 0x58
> +#define REG_IP_CTRL1 0x59
> +#define REG_IP_CTRL2 0x5A
> +
> +#define REG_LINK_DRV 0x5C
> +#define DRV_HS BIT(1)
> +
> +#define REG_DRV_LN_DATA_SEL 0x5D
> +
> +#define REG_AUX 0x5E
> +
> +#define REG_VID_BUS_CTRL0 0x60
> +#define IN_DDR BIT(2)
> +#define DDR_CD (0x01 << 6)
> +
> +#define REG_VID_BUS_CTRL1 0x61
> +#define TX_FIFO_RESET BIT(1)
> +
> +#define REG_INPUT_CTRL 0xA0
> +#define INPUT_HSYNC_POL BIT(0)
> +#define INPUT_VSYNC_POL BIT(2)
> +#define INPUT_INTERLACED BIT(4)
> +
> +#define REG_INPUT_HTOTAL 0xA1
> +#define REG_INPUT_HACTIVE_START 0xA3
> +#define REG_INPUT_HACTIVE_WIDTH 0xA5
> +#define REG_INPUT_HFRONT_PORCH 0xA7
> +#define REG_INPUT_HSYNC_WIDTH 0xA9
> +#define REG_INPUT_VTOTAL 0xAB
> +#define REG_INPUT_VACTIVE_START 0xAD
> +#define REG_INPUT_VACTIVE_WIDTH 0xAF
> +#define REG_INPUT_VFRONT_PORCH 0xB1
> +#define REG_INPUT_VSYNC_WIDTH 0xB3
> +
> +#define REG_AUDIO_SRC_CTRL 0xB8
> +#define M_AUDIO_I2S_EN 0x0F
> +#define EN_I2S0 BIT(0)
> +#define EN_I2S1 BIT(1)
> +#define EN_I2S2 BIT(2)
> +#define EN_I2S3 BIT(3)
> +#define AUDIO_FIFO_RESET BIT(7)
> +
> +#define REG_AUDIO_FMT 0xB9
> +#define REG_AUDIO_FIFO_SEL 0xBA
> +
> +#define REG_AUDIO_CTRL0 0xBB
> +#define AUDIO_FULL_PKT BIT(4)
> +#define AUDIO_16B_BOUND BIT(5)
> +
> +#define REG_AUDIO_CTRL1 0xBC
> +#define REG_AUDIO_INPUT_FREQ 0xBE
> +
> +#define REG_IEC958_STS0 0xBF
> +#define REG_IEC958_STS1 0xC0
> +#define REG_IEC958_STS2 0xC1
> +#define REG_IEC958_STS3 0xC2
> +#define REG_IEC958_STS4 0xC3
> +
> +#define REG_HPD_IRQ_TIME 0xC9
> +#define REG_AUX_DEBUG_MODE 0xCA
> +#define REG_AUX_OPT2 0xCB
> +#define REG_HDCP_OPT 0xCE
> +#define REG_USER_DRV_PRE 0xCF
> +
> +#define REG_DATA_MUTE_CTRL 0xD3
> +#define ENABLE_ENHANCED_FRAME BIT(0)
> +#define ENABLE_AUTO_VIDEO_FIFO_RESET BIT(1)
> +#define EN_VID_MUTE BIT(4)
> +#define EN_AUD_MUTE BIT(5)
> +
> +#define REG_TIME_STMP_CTRL 0xD4
> +#define EN_ENHANCE_VID_STMP BIT(0)
> +#define EN_ENHANCE_AUD_STMP BIT(2)
> +#define M_STAMP_STEP 0x30
> +#define EN_SSC_GAT BIT(6)
> +
> +#define REG_INFOFRAME_CTRL 0xE8
> +#define EN_AVI_PKT BIT(0)
> +#define EN_AUD_PKT BIT(1)
> +#define EN_MPG_PKT BIT(2)
> +#define EN_GEN_PKT BIT(3)
> +#define EN_VID_TIME_STMP BIT(4)
> +#define EN_AUD_TIME_STMP BIT(5)
> +#define EN_VID_CTRL_PKT (EN_AVI_PKT | EN_VID_TIME_STMP)
> +#define EN_AUD_CTRL_PKT (EN_AUD_PKT | EN_AUD_TIME_STMP)
> +
> +#define REG_AUDIO_N_0_7 0xDE
> +#define REG_AUDIO_N_8_15 0xDF
> +#define REG_AUDIO_N_16_23 0xE0
> +
> +#define REG_AVI_INFO_DB1 0xE9
> +#define REG_AVI_INFO_DB2 0xEA
> +#define REG_AVI_INFO_DB3 0xEB
> +#define REG_AVI_INFO_DB4 0xEC
> +#define REG_AVI_INFO_DB5 0xED
> +#define REG_AVI_INFO_SUM 0xF6
> +
> +#define REG_AUD_INFOFRAM_DB1 0xF7
> +#define REG_AUD_INFOFRAM_DB2 0xF8
> +#define REG_AUD_INFOFRAM_DB3 0xF9
> +#define REG_AUD_INFOFRAM_DB4 0xFA
> +#define REG_AUD_INFOFRAM_SUM 0xFB
> +
> +/* the following six registers are in bank1 */
> +#define REG_DRV_0_DB_800_MV 0x7E
> +#define REG_PRE_0_DB_800_MV 0x7F
> +#define REG_PRE_3P5_DB_800_MV 0x81
> +#define REG_SSC_CTRL0 0x88
> +#define REG_SSC_CTRL1 0x89
> +#define REG_SSC_CTRL2 0x8A
> +
> +#define RBR DP_LINK_BW_1_62
> +#define HBR DP_LINK_BW_2_7
> +#define HBR2 DP_LINK_BW_5_4
> +#define HBR3 DP_LINK_BW_8_1
> +
> +#define MISC_VERB 0xF0
> +#define MISC_VERC 0x70
> +#define I2S_INPUT_FORMAT_STANDARD 0
> +#define I2S_INPUT_FORMAT_32BIT 1
> +#define I2S_INPUT_LEFT_JUSTIFIED 0
> +#define I2S_INPUT_RIGHT_JUSTIFIED 1
> +#define I2S_DATA_1T_DELAY 0
> +#define I2S_DATA_NO_DELAY 1
> +#define I2S_WS_LEFT_CHANNEL 0
> +#define I2S_WS_RIGHT_CHANNEL 1
> +#define I2S_DATA_MSB_FIRST 0
> +#define I2S_DATA_LSB_FIRST 1
> +#define WORD_LENGTH_16BIT 0
> +#define WORD_LENGTH_18BIT 1
> +#define WORD_LENGTH_20BIT 2
> +#define WORD_LENGTH_24BIT 3
> +
> +/* Vendor option */
> +#define HDCP_DESIRED 1
> +#define MAX_LANE_COUNT 4
> +#define MAX_LINK_RATE HBR
> +#define AUTO_TRAIN_RETRY 3
> +#define MAX_HDCP_DOWN_STREAM_COUNT 10
> +#define MAX_CR_LEVEL 0x03
> +#define MAX_EQ_LEVEL 0x03
> +#define AUX_WAIT_TIMEOUT_MS 15
> +#define AUX_FIFO_MAX_SIZE 32
> +#define PIXEL_CLK_DELAY 1
> +#define PIXEL_CLK_INVERSE 0
> +#define ADJUST_PHASE_THRESHOLD 80000
> +#define DPI_PIXEL_CLK_MAX 95000
> +#define HDCP_SHA1_FIFO_LEN (MAX_HDCP_DOWN_STREAM_COUNT * 5 + 10)
> +#define DEFAULT_PWR_ON 0
> +#define DEFAULT_DRV_HOLD 0
> +
> +#define AUDIO_SELECT I2S
> +#define AUDIO_TYPE LPCM
> +#define AUDIO_SAMPLE_RATE SAMPLE_RATE_48K
> +#define AUDIO_CHANNEL_COUNT 2
> +#define I2S_INPUT_FORMAT I2S_INPUT_FORMAT_32BIT
> +#define I2S_JUSTIFIED I2S_INPUT_LEFT_JUSTIFIED
> +#define I2S_DATA_DELAY I2S_DATA_1T_DELAY
> +#define I2S_WS_CHANNEL I2S_WS_LEFT_CHANNEL
> +#define I2S_DATA_SEQUENCE I2S_DATA_MSB_FIRST
> +#define AUDIO_WORD_LENGTH WORD_LENGTH_24BIT
> +
> +enum aux_cmd_type {
> +       CMD_AUX_NATIVE_READ = 0x0,
> +       CMD_AUX_NATIVE_WRITE = 0x5,
> +       CMD_AUX_I2C_EDID_READ = 0xB,
> +};
> +
> +enum aux_cmd_reply {
> +       REPLY_ACK,
> +       REPLY_NACK,
> +       REPLY_DEFER,
> +};
> +
> +enum link_train_status {
> +       LINK_IDLE,
> +       LINK_BUSY,
> +       LINK_OK,
> +};
> +
> +enum hdcp_state {
> +       HDCP_AUTH_IDLE,
> +       HDCP_AUTH_GOING,
> +       HDCP_AUTH_DONE,
> +};
> +
> +struct it6505_platform_data {
> +       struct regulator *pwr18;
> +       struct regulator *ovdd;
> +       struct gpio_desc *gpiod_reset;
> +};
> +
> +enum it6505_audio_select {
> +       I2S = 0,
> +       SPDIF,
> +};
> +
> +enum it6505_audio_sample_rate {
> +       SAMPLE_RATE_24K = 0x6,
> +       SAMPLE_RATE_32K = 0x3,
> +       SAMPLE_RATE_48K = 0x2,
> +       SAMPLE_RATE_96K = 0xA,
> +       SAMPLE_RATE_192K = 0xE,
> +       SAMPLE_RATE_44_1K = 0x0,
> +       SAMPLE_RATE_88_2K = 0x8,
> +       SAMPLE_RATE_176_4K = 0xC,
> +};
> +
> +enum it6505_audio_type {
> +       LPCM = 0,
> +       NLPCM,
> +       DSS,
> +};
> +
> +struct it6505_audio_data {
> +       enum it6505_audio_select select;
> +       enum it6505_audio_sample_rate sample_rate;
> +       enum it6505_audio_type type;
> +       u8 word_length;
> +       u8 channel_count;
> +       u8 i2s_input_format;
> +       u8 i2s_justified;
> +       u8 i2s_data_delay;
> +       u8 i2s_ws_channel;
> +       u8 i2s_data_sequence;
> +};
> +
> +struct it6505_audio_sample_rate_map {
> +       enum it6505_audio_sample_rate rate;
> +       int sample_rate_value;
> +};
> +
> +struct it6505_drm_dp_link {
> +       unsigned char revision;
> +       unsigned int rate;
> +       unsigned int num_lanes;
> +       unsigned long capabilities;
> +};
> +
> +struct it6505 {
> +       struct drm_dp_aux aux;
> +       struct drm_bridge bridge;
> +       struct i2c_client *client;
> +       struct edid *edid;
> +       struct it6505_drm_dp_link link;
> +       struct it6505_platform_data pdata;
> +       struct mutex extcon_lock;
> +       struct mutex mode_lock;
> +       struct mutex aux_lock;
> +       struct regmap *regmap;
> +       struct drm_display_mode source_output_mode;
> +       struct drm_display_mode video_info;
> +       struct notifier_block event_nb;
> +       struct extcon_dev *extcon;
> +       struct work_struct extcon_wq;
> +       enum drm_connector_status connector_status;
> +       enum link_train_status link_state;
> +       struct work_struct link_works;
> +       u8 dpcd[DP_RECEIVER_CAP_SIZE];
> +       u8 lane_count;
> +       u8 link_rate_bw_code;
> +       u8 sink_count;
> +       bool step_train;
> +       bool branch_device;
> +       bool enable_ssc;
> +       bool lane_swap_disabled;
> +       bool lane_swap;
> +       bool powered;
> +       bool hpd_state;
> +       u32 afe_setting;
> +       enum hdcp_state hdcp_status;
> +       struct delayed_work hdcp_work;
> +       struct work_struct hdcp_wait_ksv_list;
> +       struct completion wait_edid_complete;
> +       u8 auto_train_retry;
> +       bool hdcp_desired;
> +       bool is_repeater;
> +       u8 hdcp_down_stream_count;
> +       u8 bksvs[DRM_HDCP_KSV_LEN];
> +       u8 sha1_input[HDCP_SHA1_FIFO_LEN];
> +       bool enable_enhanced_frame;
> +       hdmi_codec_plugged_cb plugged_cb;
> +       struct device *codec_dev;
> +       struct delayed_work delayed_audio;
> +       struct it6505_audio_data audio;
> +
> +       /* it6505 driver hold option */
> +       bool enable_drv_hold;
> +};
> +
> +struct it6505_step_train_para {
> +       u8 voltage_swing[MAX_LANE_COUNT];
> +       u8 pre_emphasis[MAX_LANE_COUNT];
> +};
> +
> +/*
> + * Vendor option afe settings for different platforms
> + * 0: without FPC cable
> + * 1: with FPC cable
> + */
> +
> +static u8 const afe_setting_table[][3] = {
> +       {0x82, 0x00, 0x45},
> +       {0x93, 0x2A, 0x85}
> +};
> +
> +static const struct it6505_audio_sample_rate_map audio_sample_rate_map[] = {
> +       {SAMPLE_RATE_24K, 24000},
> +       {SAMPLE_RATE_32K, 32000},
> +       {SAMPLE_RATE_48K, 48000},
> +       {SAMPLE_RATE_96K, 96000},
> +       {SAMPLE_RATE_192K, 192000},
> +       {SAMPLE_RATE_44_1K, 44100},
> +       {SAMPLE_RATE_88_2K, 88200},
> +       {SAMPLE_RATE_176_4K, 176400},
> +};
> +
> +static const struct regmap_range it6505_bridge_volatile_ranges[] = {
> +       { .range_min = 0, .range_max = 0xFF },
> +};
> +
> +static const struct regmap_access_table it6505_bridge_volatile_table = {
> +       .yes_ranges = it6505_bridge_volatile_ranges,
> +       .n_yes_ranges = ARRAY_SIZE(it6505_bridge_volatile_ranges),
> +};
> +
> +static const struct regmap_config it6505_regmap_config = {
> +       .reg_bits = 8,
> +       .val_bits = 8,
> +       .volatile_table = &it6505_bridge_volatile_table,
> +       .cache_type = REGCACHE_NONE,
> +};
> +
> +static int it6505_read(struct it6505 *it6505, unsigned int reg_addr)
> +{
> +       unsigned int value;
> +       int err;
> +       struct device *dev = &it6505->client->dev;
> +
> +       err = regmap_read(it6505->regmap, reg_addr, &value);
> +       if (err < 0) {
> +               DRM_DEV_ERROR(dev, "read failed reg[0x%x] err: %d", reg_addr,
> +                             err);
> +               return err;
> +       }
> +
> +       return value;
> +}
> +
> +static int it6505_write(struct it6505 *it6505, unsigned int reg_addr,
> +                     unsigned int reg_val)
> +{
> +       int err;
> +       struct device *dev = &it6505->client->dev;
> +
> +       err = regmap_write(it6505->regmap, reg_addr, reg_val);
> +
> +       if (err < 0) {
> +               DRM_DEV_ERROR(dev, "write failed reg[0x%x] = 0x%x err = %d",
> +                             reg_addr, reg_val, err);
> +               return err;
> +       }
> +
> +       return 0;
> +}
> +
> +static int it6505_set_bits(struct it6505 *it6505, unsigned int reg,
> +                        unsigned int mask, unsigned int value)
> +{
> +       int err;
> +       struct device *dev = &it6505->client->dev;
> +
> +       err = regmap_update_bits(it6505->regmap, reg, mask, value);
> +       if (err < 0) {
> +               DRM_DEV_ERROR(
> +                       dev, "write reg[0x%x] = 0x%x mask = 0x%x failed err %d",
> +                       reg, value, mask, err);
> +               return err;
> +       }
> +
> +       return 0;
> +}
> +
> +static void it6505_debug_print(struct it6505 *it6505, unsigned int reg,
> +                            const char *prefix)
> +{
> +       struct device *dev = &it6505->client->dev;
> +       int val;
> +
> +       if (likely(!(__drm_debug & DRM_UT_DRIVER)))
> +               return;
> +
> +       val = it6505_read(it6505, reg);
> +       if (val < 0)
> +               DRM_DEV_DEBUG_DRIVER(dev, "%s reg[%02x] read error (%d)",
> +                                    prefix, reg, val);
> +       else
> +               DRM_DEV_DEBUG_DRIVER(dev, "%s reg[%02x] = 0x%02x", prefix, reg,
> +                                    val);
> +}
> +
> +static int it6505_dpcd_read(struct it6505 *it6505, unsigned long offset)
> +{
> +       u8 value;
> +       int ret;
> +       struct device *dev = &it6505->client->dev;
> +
> +       ret = drm_dp_dpcd_readb(&it6505->aux, offset, &value);
> +       if (ret < 0) {
> +               DRM_DEV_ERROR(dev, "DPCD read failed [0x%lx] ret: %d", offset,
> +                             ret);
> +               return ret;
> +       }
> +       return value;
> +}
> +
> +static int it6505_dpcd_write(struct it6505 *it6505, unsigned long offset,
> +                            unsigned long datain)
> +{

datain should probably be a u8, since that is the data type that
drm_dp_dpcd_writeb() takes.

> +       int ret;
> +       struct device *dev = &it6505->client->dev;
> +
> +       ret = drm_dp_dpcd_writeb(&it6505->aux, offset, datain);
> +       if (ret < 0) {
> +               DRM_DEV_ERROR(dev, "DPCD write failed [0x%lx] ret: %d", offset,
> +                             ret);
> +               return ret;
> +       }
> +       return 0;
> +}
> +
> +static int it6505_get_dpcd(struct it6505 *it6505, int offset, u8 *dpcd, int num)
> +{
> +       int ret;
> +       struct device *dev = &it6505->client->dev;
> +
> +       ret = drm_dp_dpcd_read(&it6505->aux, offset, dpcd, num);
> +
> +       if (ret < 0)
> +               return ret;
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "ret = %d DPCD[0x%x] = 0x%*ph", ret, offset,
> +                            num, dpcd);
> +
> +       return 0;
> +}
> +
> +static void it6505_dump(struct it6505 *it6505)
> +{
> +       unsigned int i, j;
> +       u8 regs[16];
> +       struct device *dev = &it6505->client->dev;
> +
> +       for (i = 0; i <= 0xff; i += 16) {
> +               for (j = 0; j < 16; j++)
> +                       regs[j] = it6505_read(it6505, i + j);
> +
> +               DRM_DEV_DEBUG_DRIVER(dev, "[0x%02x] = %16ph", i, regs);
> +       }
> +}
> +
> +static bool it6505_get_sink_hpd_status(struct it6505 *it6505)
> +{
> +       int reg_0d;
> +
> +       reg_0d = it6505_read(it6505, REG_SYSTEM_STS);
> +
> +       if (reg_0d < 0)
> +               return false;
> +
> +       return reg_0d & HPD_STS;
> +}
> +
> +static int it6505_read_word(struct it6505 *it6505, unsigned int reg)
> +{
> +       int val0, val1;
> +
> +       val0 = it6505_read(it6505, reg);
> +       if (val0 < 0)
> +               return val0;
> +
> +       val1 = it6505_read(it6505, reg + 1);
> +       if (val1 < 0)
> +               return val1;
> +
> +       return (val1 << 8) | val0;
> +}
> +
> +static void it6505_calc_video_info(struct it6505 *it6505)
> +{
> +       struct device *dev = &it6505->client->dev;
> +       int hsync_pol, vsync_pol, interlaced;
> +       int htotal, hdes, hdew, hfph, hsyncw;
> +       int vtotal, vdes, vdew, vfph, vsyncw;
> +       int rddata, i, pclk, sum = 0;
> +
> +       usleep_range(10000, 15000);
> +       rddata = it6505_read(it6505, REG_INPUT_CTRL);
> +       hsync_pol = rddata & INPUT_HSYNC_POL;
> +       vsync_pol = (rddata & INPUT_VSYNC_POL) >> 2;
> +       interlaced = (rddata & INPUT_INTERLACED) >> 4;
> +
> +       htotal = it6505_read_word(it6505, REG_INPUT_HTOTAL) & 0x1FFF;
> +       hdes = it6505_read_word(it6505, REG_INPUT_HACTIVE_START) & 0x1FFF;
> +       hdew = it6505_read_word(it6505, REG_INPUT_HACTIVE_WIDTH) & 0x1FFF;
> +       hfph = it6505_read_word(it6505, REG_INPUT_HFRONT_PORCH) & 0x1FFF;
> +       hsyncw = it6505_read_word(it6505, REG_INPUT_HSYNC_WIDTH) & 0x1FFF;
> +
> +       vtotal = it6505_read_word(it6505, REG_INPUT_VTOTAL) & 0xFFF;
> +       vdes = it6505_read_word(it6505, REG_INPUT_VACTIVE_START) & 0xFFF;
> +       vdew = it6505_read_word(it6505, REG_INPUT_VACTIVE_WIDTH) & 0xFFF;
> +       vfph = it6505_read_word(it6505, REG_INPUT_VFRONT_PORCH) & 0xFFF;
> +       vsyncw = it6505_read_word(it6505, REG_INPUT_VSYNC_WIDTH) & 0xFFF;
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "hsync_pol:%d, vsync_pol:%d, interlaced:%d",
> +                            hsync_pol, vsync_pol, interlaced);
> +       DRM_DEV_DEBUG_DRIVER(dev, "hactive_start:%d, vactive_start:%d",
> +                            hdes, vdes);
> +
> +       for (i = 0; i < 10; i++) {
> +               it6505_set_bits(it6505, REG_DATA_CTRL0, ENABLE_PCLK_COUNTER,
> +                               ENABLE_PCLK_COUNTER);
> +               usleep_range(10000, 15000);
> +               it6505_set_bits(it6505, REG_DATA_CTRL0, ENABLE_PCLK_COUNTER,
> +                               0x00);
> +               rddata = it6505_read_word(it6505, REG_PCLK_COUNTER_VALUE) &
> +                        0xFFF;
> +
> +               sum += rddata;
> +       }
> +
> +       if (sum == 0) {
> +               DRM_DEV_DEBUG_DRIVER(dev, "calc video timing error");
> +               return;
> +       }
> +
> +       sum /= 10;
> +       pclk = 13500 * 2048 / sum;
> +       it6505->video_info.clock = pclk;
> +       it6505->video_info.hdisplay = hdew;
> +       it6505->video_info.hsync_start = hdew + hfph;
> +       it6505->video_info.hsync_end = hdew + hfph + hsyncw;
> +       it6505->video_info.htotal = htotal;
> +       it6505->video_info.vdisplay = vdew;
> +       it6505->video_info.vsync_start = vdew + vfph;
> +       it6505->video_info.vsync_end = vdew + vfph + vsyncw;
> +       it6505->video_info.vtotal = vtotal;
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, DRM_MODE_FMT,
> +                            DRM_MODE_ARG(&it6505->video_info));
> +}
> +
> +static int it6505_drm_dp_link_probe(struct drm_dp_aux *aux,
> +                                   struct it6505_drm_dp_link *link)
> +{
> +       u8 values[3];
> +       int err;
> +
> +       memset(link, 0, sizeof(*link));
> +
> +       err = drm_dp_dpcd_read(aux, DP_DPCD_REV, values, sizeof(values));
> +       if (err < 0)
> +               return err;
> +
> +       link->revision = values[0];
> +       link->rate = drm_dp_bw_code_to_link_rate(values[1]);
> +       link->num_lanes = values[2] & DP_MAX_LANE_COUNT_MASK;
> +
> +       if (values[2] & DP_ENHANCED_FRAME_CAP)
> +               link->capabilities = 1;

The capabilities variable seems to only represent the enhanced frame
cap. I'd suggest either renaming the variable, or better yet instead
of assigning '1' assigning 'DP_ENHANCED_FRAME_CAP'.

> +
> +       return 0;
> +}
> +
> +static int it6505_drm_dp_link_power_up(struct drm_dp_aux *aux,
> +                                      struct it6505_drm_dp_link *link)
> +{
> +       u8 value;
> +       int err;
> +
> +       /* DP_SET_POWER register is only available on DPCD v1.1 and later */
> +       if (link->revision < 0x11)

Please replace 0x11 with a #define, to improve legibility.

> +               return 0;
> +
> +       err = drm_dp_dpcd_readb(aux, DP_SET_POWER, &value);
> +       if (err < 0)
> +               return err;
> +
> +       value &= ~DP_SET_POWER_MASK;
> +       value |= DP_SET_POWER_D0;
> +
> +       err = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value);
> +       if (err < 0)
> +               return err;
> +
> +       /*
> +        * According to the DP 1.1 specification, a "Sink Device must exit the
> +        * power saving state within 1 ms" (Section 2.5.3.1, Table 5-52, "Sink
> +        * Control Field" (register 0x600).
> +        */
> +       usleep_range(1000, 2000);
> +
> +       return 0;
> +}
> +
> +static void it6505_clear_int(struct it6505 *it6505)
> +{
> +       it6505_write(it6505, INT_STATUS_01, 0xFF);
> +       it6505_write(it6505, INT_STATUS_02, 0xFF);
> +       it6505_write(it6505, INT_STATUS_03, 0xFF);
> +}
> +
> +static void it6505_int_mask_enable(struct it6505 *it6505)
> +{
> +       it6505_write(it6505, INT_MASK_01, 0x1F);
> +       it6505_write(it6505, INT_MASK_02, 0x07);
> +       it6505_write(it6505, INT_MASK_03, 0xB0);

Documenting the individual bits of the interrupt mask values would be nice.

Maybe something along the lines of the below snippet.

#define BIT_INT_TYPE_1 0
#define BIT_INT_TYPE_2 1
#define BIT_INT_TYPE_3 2

it6505_write(it6505, INT_MASK_01,
         BIT(BIT_INT_TYPE_1) ||
         BIT(BIT_INT_TYPE_3));

> +}
> +
> +static void it6505_int_mask_disable(struct it6505 *it6505)
> +{
> +       it6505_write(it6505, INT_MASK_01, 0x00);
> +       it6505_write(it6505, INT_MASK_02, 0x00);
> +       it6505_write(it6505, INT_MASK_03, 0x00);
> +}
> +
> +static void it6505_lane_termination_on(struct it6505 *it6505)
> +{
> +       int regcf;
> +
> +       regcf = it6505_read(it6505, REG_USER_DRV_PRE);
> +
> +       if (regcf == MISC_VERB)
> +               it6505_set_bits(it6505, REG_DRV_LN_DATA_SEL, 0x80, 0x00);
> +
> +       if (regcf == MISC_VERC) {
> +               if (it6505->lane_swap) {
> +                       switch (it6505->lane_count) {
> +                       case 1:
> +                       case 2:
> +                               it6505_set_bits(it6505, REG_DRV_LN_DATA_SEL,
> +                                               0x0C, 0x08);
> +                               break;
> +                       default:
> +                               it6505_set_bits(it6505, REG_DRV_LN_DATA_SEL,
> +                                               0x0C, 0x0C);
> +                               break;
> +                       }
> +               } else {
> +                       switch (it6505->lane_count) {
> +                       case 1:
> +                       case 2:
> +                               it6505_set_bits(it6505, REG_DRV_LN_DATA_SEL,
> +                                               0x0C, 0x04);
> +                               break;
> +                       default:
> +                               it6505_set_bits(it6505, REG_DRV_LN_DATA_SEL,
> +                                               0x0C, 0x0C);
> +                               break;
> +                       }
> +               }
> +       }
> +}
> +
> +static void it6505_lane_termination_off(struct it6505 *it6505)
> +{
> +       int regcf;
> +
> +       regcf = it6505_read(it6505, REG_USER_DRV_PRE);
> +
> +       if (regcf == MISC_VERB)
> +               it6505_set_bits(it6505, REG_DRV_LN_DATA_SEL, 0x80, 0x80);
> +
> +       if (regcf == MISC_VERC)
> +               it6505_set_bits(it6505, REG_DRV_LN_DATA_SEL, 0x0C, 0x00);
> +}
> +
> +static void it6505_lane_power_on(struct it6505 *it6505)
> +{
> +       it6505_set_bits(it6505, REG_LINK_DRV, 0xF1,
> +                       (it6505->lane_swap ?
> +                                GENMASK(7, 8 - it6505->lane_count) :
> +                                GENMASK(3 + it6505->lane_count, 4)) |
> +                               0x01);
> +}
> +
> +static void it6505_lane_power_off(struct it6505 *it6505)
> +{
> +       it6505_set_bits(it6505, REG_LINK_DRV, 0xF0, 0x00);
> +}
> +
> +static void it6505_lane_off(struct it6505 *it6505)
> +{
> +       it6505_lane_power_off(it6505);
> +       it6505_lane_termination_off(it6505);
> +}
> +
> +static void it6505_aux_termination_on(struct it6505 *it6505)
> +{
> +       int regcf;
> +
> +       regcf = it6505_read(it6505, REG_USER_DRV_PRE);
> +
> +       if (regcf == MISC_VERB)
> +               it6505_lane_termination_on(it6505);
> +
> +       if (regcf == MISC_VERC)
> +               it6505_set_bits(it6505, REG_DRV_LN_DATA_SEL, 0x80, 0x80);
> +}
> +
> +static void it6505_aux_power_on(struct it6505 *it6505)
> +{
> +       it6505_set_bits(it6505, REG_AUX, 0x02, 0x02);
> +}
> +
> +static void it6505_aux_on(struct it6505 *it6505)
> +{
> +       it6505_aux_power_on(it6505);
> +       it6505_aux_termination_on(it6505);
> +}
> +
> +static void it6505_aux_reset(struct it6505 *it6505)
> +{
> +       it6505_set_bits(it6505, REG_RESET_CTRL, AUX_RESET, AUX_RESET);
> +       it6505_set_bits(it6505, REG_RESET_CTRL, AUX_RESET, 0x00);
> +}
> +
> +static void it6505_reset_logic(struct it6505 *it6505)
> +{
> +       regmap_write(it6505->regmap, REG_RESET_CTRL, ALL_LOGIC_RESET);
> +       usleep_range(1000, 1500);
> +}
> +
> +static bool it6505_aux_op_finished(struct it6505 *it6505)
> +{
> +       int reg2b = it6505_read(it6505, REG_AUX_CMD_REQ);
> +
> +       if (reg2b < 0)
> +               return false;
> +
> +       return (reg2b & AUX_BUSY) == 0;
> +}
> +
> +static int it6505_aux_wait(struct it6505 *it6505)
> +{
> +       int status;
> +       unsigned long timeout;
> +       struct device *dev = &it6505->client->dev;
> +
> +       timeout = jiffies + msecs_to_jiffies(AUX_WAIT_TIMEOUT_MS) + 1;
> +
> +       while (!it6505_aux_op_finished(it6505)) {
> +               if (time_after(jiffies, timeout)) {
> +                       DRM_DEV_ERROR(dev, "Timed out waiting AUX to finish");
> +                       return -ETIMEDOUT;
> +               }
> +               usleep_range(1000, 2000);
> +       }
> +
> +       status = it6505_read(it6505, REG_AUX_ERROR_STS);
> +       if (status < 0) {
> +               DRM_DEV_ERROR(dev, "Failed to read AUX channel: %d", status);
> +               return status;
> +       }
> +
> +       return 0;
> +}
> +
> +static ssize_t it6505_aux_operation(struct it6505 *it6505,
> +                                   enum aux_cmd_type cmd,
> +                                   unsigned int address, u8 *buffer,
> +                                   size_t size, enum aux_cmd_reply *reply)
> +{
> +       int i, ret;
> +       bool aux_write_check = false;
> +
> +       if (!it6505_get_sink_hpd_status(it6505))
> +               return -EIO;
> +
> +       /* set AUX user mode */
> +       it6505_set_bits(it6505, REG_AUX_CTRL, AUX_USER_MODE, AUX_USER_MODE);
> +
> +aux_op_start:
> +       if (cmd == CMD_AUX_I2C_EDID_READ) {
> +               /* AUX EDID FIFO has max length of AUX_FIFO_MAX_SIZE bytes. */
> +               size = min_t(size_t, size, AUX_FIFO_MAX_SIZE);
> +               /* Enable AUX FIFO read back and clear FIFO */
> +               it6505_set_bits(it6505, REG_AUX_CTRL,
> +                               AUX_EN_FIFO_READ | CLR_EDID_FIFO,
> +                               AUX_EN_FIFO_READ | CLR_EDID_FIFO);
> +
> +               it6505_set_bits(it6505, REG_AUX_CTRL,
> +                               AUX_EN_FIFO_READ | CLR_EDID_FIFO,
> +                               AUX_EN_FIFO_READ);
> +       } else {
> +               /* The DP AUX transmit buffer has 4 bytes. */
> +               size = min_t(size_t, size, 4);
> +               it6505_set_bits(it6505, REG_AUX_CTRL, AUX_NO_SEGMENT_WR,
> +                               AUX_NO_SEGMENT_WR);
> +       }
> +
> +       /* Start Address[7:0] */
> +       it6505_write(it6505, REG_AUX_ADR_0_7, (address >> 0) & 0xFF);
> +       /* Start Address[15:8] */
> +       it6505_write(it6505, REG_AUX_ADR_8_15, (address >> 8) & 0xFF);
> +       /* WriteNum[3:0]+StartAdr[19:16] */
> +       it6505_write(it6505, REG_AUX_ADR_16_19,
> +                    ((address >> 16) & 0x0F) | ((size - 1) << 4));
> +
> +       if (cmd == CMD_AUX_NATIVE_WRITE)
> +               regmap_bulk_write(it6505->regmap, REG_AUX_OUT_DATA0, buffer,
> +                                 size);
> +
> +       /* Aux Fire */
> +       it6505_write(it6505, REG_AUX_CMD_REQ, cmd);
> +
> +       ret = it6505_aux_wait(it6505);
> +       if (ret < 0)
> +               goto aux_op_err;
> +
> +       ret = it6505_read(it6505, REG_AUX_ERROR_STS);
> +       if (ret < 0)
> +               goto aux_op_err;
> +
> +       switch ((ret >> 6) & 0x3) {
> +       case 0:
> +               *reply = REPLY_ACK;
> +               break;
> +       case 1:
> +               *reply = REPLY_DEFER;
> +               ret = -EAGAIN;
> +               goto aux_op_err;
> +       case 2:
> +               *reply = REPLY_NACK;
> +               ret = -EIO;
> +               goto aux_op_err;
> +       case 3:
> +               ret = -ETIMEDOUT;
> +               goto aux_op_err;
> +       }
> +
> +       /* Read back Native Write data */
> +       if (cmd == CMD_AUX_NATIVE_WRITE) {
> +               aux_write_check = true;
> +               cmd = CMD_AUX_NATIVE_READ;
> +               goto aux_op_start;
> +       }
> +
> +       if (cmd == CMD_AUX_I2C_EDID_READ) {
> +               for (i = 0; i < size; i++) {
> +                       ret = it6505_read(it6505, REG_AUX_DATA_FIFO);
> +                       if (ret < 0)
> +                               goto aux_op_err;
> +                       buffer[i] = ret;
> +               }
> +       } else {
> +               for (i = 0; i < size; i++) {
> +                       ret = it6505_read(it6505, REG_AUX_DATA_0_7 + i);
> +                       if (ret < 0)
> +                               goto aux_op_err;
> +
> +                       if (aux_write_check && buffer[size - 1 - i] != ret) {
> +                               ret = -EINVAL;
> +                               goto aux_op_err;
> +                       }
> +
> +                       buffer[size - 1 - i] = ret;
> +               }
> +       }
> +
> +       ret = i;
> +
> +aux_op_err:
> +       if (cmd == CMD_AUX_I2C_EDID_READ) {
> +               /* clear AUX FIFO */
> +               it6505_set_bits(it6505, REG_AUX_CTRL,
> +                               AUX_EN_FIFO_READ | CLR_EDID_FIFO,
> +                               AUX_EN_FIFO_READ | CLR_EDID_FIFO);
> +               it6505_set_bits(it6505, REG_AUX_CTRL,
> +                               AUX_EN_FIFO_READ | CLR_EDID_FIFO, 0x00);
> +       }
> +
> +       /* Leave AUX user mode */
> +       it6505_set_bits(it6505, REG_AUX_CTRL, AUX_USER_MODE, 0);
> +
> +       return ret;
> +}
> +
> +static ssize_t it6505_aux_do_transfer(struct it6505 *it6505,
> +                                     enum aux_cmd_type cmd,
> +                                     unsigned int address, u8 *buffer,
> +                                     size_t size, enum aux_cmd_reply *reply)
> +{
> +       int i, ret_size, ret = 0, request_size;
> +
> +       mutex_lock(&it6505->aux_lock);
> +       for (i = 0; i < size; i += 4) {
> +               request_size = min((int)size - i, 4);
> +               ret_size = it6505_aux_operation(it6505, cmd, address + i,
> +                                               buffer + i, request_size,
> +                                               reply);
> +               if (ret_size < 0) {
> +                       ret = ret_size;
> +                       goto aux_op_err;
> +               }
> +
> +               ret += ret_size;
> +       }
> +
> +aux_op_err:
> +       mutex_unlock(&it6505->aux_lock);
> +       return ret;
> +}
> +
> +static ssize_t it6505_aux_transfer(struct drm_dp_aux *aux,
> +                                  struct drm_dp_aux_msg *msg)
> +{
> +       struct it6505 *it6505 = container_of(aux, struct it6505, aux);
> +       u8 cmd;
> +       bool is_i2c = !(msg->request & DP_AUX_NATIVE_WRITE);
> +       int ret;
> +       enum aux_cmd_reply reply;
> +
> +       /* IT6505 doesn't support arbitrary I2C read / write. */
> +       if (is_i2c)
> +               return -EINVAL;
> +
> +       switch (msg->request) {
> +       case DP_AUX_NATIVE_READ:
> +               cmd = CMD_AUX_NATIVE_READ;
> +               break;
> +       case DP_AUX_NATIVE_WRITE:
> +               cmd = CMD_AUX_NATIVE_WRITE;
> +               break;
> +       default:
> +               return -EINVAL;
> +       }
> +
> +       ret = it6505_aux_do_transfer(it6505, cmd, msg->address, msg->buffer,
> +                                    msg->size, &reply);
> +       if (ret < 0)
> +               return ret;
> +
> +       switch (reply) {
> +       case REPLY_ACK:
> +               msg->reply = DP_AUX_NATIVE_REPLY_ACK;
> +               break;
> +       case REPLY_NACK:
> +               msg->reply = DP_AUX_NATIVE_REPLY_NACK;
> +               break;
> +       case REPLY_DEFER:
> +               msg->reply = DP_AUX_NATIVE_REPLY_DEFER;
> +               break;
> +       }
> +
> +       return ret;
> +}
> +
> +static int it6505_get_edid_block(void *data, u8 *buf, unsigned int block,
> +                                size_t len)
> +{
> +       struct it6505 *it6505 = data;
> +       struct device *dev = &it6505->client->dev;
> +       enum aux_cmd_reply reply;
> +       int offset, ret, aux_retry = 100;
> +
> +       it6505_aux_reset(it6505);
> +       DRM_DEV_DEBUG_DRIVER(dev, "block number = %d", block);
> +
> +       for (offset = 0; offset < EDID_LENGTH;) {
> +               ret = it6505_aux_do_transfer(it6505, CMD_AUX_I2C_EDID_READ,
> +                                            block * EDID_LENGTH + offset,
> +                                            buf + offset, 8, &reply);
> +
> +               if (ret < 0 && ret != -EAGAIN)
> +                       return ret;
> +
> +               switch (reply) {
> +               case REPLY_ACK:
> +                       DRM_DEV_DEBUG_DRIVER(dev, "[0x%02x]: %8ph", offset,
> +                                            buf + offset);
> +                       offset += 8;
> +                       aux_retry = 100;
> +                       break;
> +               case REPLY_NACK:
> +                       return -EIO;
> +               case REPLY_DEFER:
> +                       msleep(20);
> +                       if (!(--aux_retry))
> +                               return -EIO;
> +               }
> +       }
> +
> +       return 0;
> +}
> +
> +static void it6505_variable_config(struct it6505 *it6505)
> +{
> +       it6505->link_rate_bw_code = HBR;
> +       it6505->lane_count = MAX_LANE_COUNT;
> +       it6505->link_state = LINK_IDLE;
> +       it6505->hdcp_desired = HDCP_DESIRED;
> +       it6505->auto_train_retry = AUTO_TRAIN_RETRY;
> +       it6505->audio.select = AUDIO_SELECT;
> +       it6505->audio.sample_rate = AUDIO_SAMPLE_RATE;
> +       it6505->audio.channel_count = AUDIO_CHANNEL_COUNT;
> +       it6505->audio.type = AUDIO_TYPE;
> +       it6505->audio.i2s_input_format = I2S_INPUT_FORMAT;
> +       it6505->audio.i2s_justified = I2S_JUSTIFIED;
> +       it6505->audio.i2s_data_delay = I2S_DATA_DELAY;
> +       it6505->audio.i2s_ws_channel = I2S_WS_CHANNEL;
> +       it6505->audio.i2s_data_sequence = I2S_DATA_SEQUENCE;
> +       it6505->audio.word_length = AUDIO_WORD_LENGTH;
> +       memset(it6505->sha1_input, 0, sizeof(it6505->sha1_input));
> +       memset(it6505->bksvs, 0, sizeof(it6505->bksvs));
> +}
> +
> +static int it6505_send_video_infoframe(struct it6505 *it6505,
> +                                      struct hdmi_avi_infoframe *frame)
> +{
> +       u8 buffer[HDMI_INFOFRAME_HEADER_SIZE + HDMI_AVI_INFOFRAME_SIZE];
> +       int err;
> +       struct device *dev = &it6505->client->dev;
> +
> +       err = hdmi_avi_infoframe_pack(frame, buffer, sizeof(buffer));
> +       if (err < 0) {
> +               DRM_DEV_ERROR(dev, "Failed to pack AVI infoframe: %d", err);
> +               return err;
> +       }
> +
> +       err = it6505_set_bits(it6505, REG_INFOFRAME_CTRL, EN_AVI_PKT, 0x00);
> +       if (err)
> +               return err;
> +
> +       err = regmap_bulk_write(it6505->regmap, REG_AVI_INFO_DB1,
> +                               buffer + HDMI_INFOFRAME_HEADER_SIZE,
> +                               frame->length);
> +       if (err)
> +               return err;
> +
> +       err = it6505_set_bits(it6505, REG_INFOFRAME_CTRL, EN_AVI_PKT,
> +                             EN_AVI_PKT);
> +       if (err)
> +               return err;
> +
> +       return 0;
> +}
> +
> +static void it6505_get_extcon_property(struct it6505 *it6505)
> +{
> +       int err;
> +       union extcon_property_value property;
> +       struct device *dev = &it6505->client->dev;
> +
> +       if (it6505->extcon && !it6505->lane_swap_disabled) {
> +               err = extcon_get_property(it6505->extcon, EXTCON_DISP_DP,
> +                                         EXTCON_PROP_USB_TYPEC_POLARITY,
> +                                         &property);
> +               if (err) {
> +                       DRM_DEV_ERROR(dev, "get property fail!");
> +                       return;
> +               }
> +               it6505->lane_swap = property.intval;
> +       }
> +}
> +
> +static void it6505_clk_phase_adjustment(struct it6505 *it6505,
> +                                       const struct drm_display_mode *mode)
> +{
> +       it6505_set_bits(it6505, REG_CLK_CTRL0, M_PCLK_DELAY,
> +               mode->clock < ADJUST_PHASE_THRESHOLD ? PIXEL_CLK_DELAY : 0);
> +       it6505_set_bits(it6505, REG_DATA_CTRL0, VIDEO_LATCH_EDGE,
> +                       PIXEL_CLK_INVERSE << 4);
> +}
> +
> +static void it6505_link_reset_step_train(struct it6505 *it6505)
> +{
> +       it6505_set_bits(it6505, REG_TRAIN_CTRL0,
> +                       FORCE_CR_DONE | FORCE_EQ_DONE, 0x00);
> +       it6505_dpcd_write(it6505, DP_TRAINING_PATTERN_SET,
> +                         DP_TRAINING_PATTERN_DISABLE);
> +}
> +
> +static void it6505_init(struct it6505 *it6505)
> +{
> +       it6505_write(it6505, REG_AUX_OPT, AUX_AUTO_RST | AUX_FIX_FREQ);
> +       it6505_write(it6505, REG_AUX_CTRL, AUX_NO_SEGMENT_WR);
> +       it6505_write(it6505, REG_HDCP_CTRL2, HDCP_AN_SEL | HDCP_HW_HPDIRQ_ACT);
> +       it6505_write(it6505, REG_VID_BUS_CTRL0, IN_DDR | DDR_CD);
> +       it6505_write(it6505, REG_VID_BUS_CTRL1, 0x01);
> +       it6505_write(it6505, REG_AUDIO_CTRL0, AUDIO_16B_BOUND);
> +
> +       /* chip internal setting, don't modify */
> +       it6505_write(it6505, REG_HPD_IRQ_TIME, 0xF5);
> +       it6505_write(it6505, REG_AUX_DEBUG_MODE, 0x4D);
> +       it6505_write(it6505, REG_AUX_OPT2, 0x17);
> +       it6505_write(it6505, REG_HDCP_OPT, 0x60);
> +       it6505_write(it6505, REG_DATA_MUTE_CTRL,
> +                    EN_VID_MUTE | EN_AUD_MUTE | ENABLE_AUTO_VIDEO_FIFO_RESET);
> +       it6505_write(it6505, REG_TIME_STMP_CTRL,
> +                    EN_SSC_GAT | EN_ENHANCE_VID_STMP | EN_ENHANCE_AUD_STMP);
> +       it6505_write(it6505, REG_INFOFRAME_CTRL, 0x00);
> +       it6505_write(it6505, REG_BANK_SEL, 0x01);
> +       it6505_write(it6505, REG_DRV_0_DB_800_MV,
> +                    afe_setting_table[it6505->afe_setting][0]);
> +       it6505_write(it6505, REG_PRE_0_DB_800_MV,
> +                    afe_setting_table[it6505->afe_setting][1]);
> +       it6505_write(it6505, REG_PRE_3P5_DB_800_MV,
> +                    afe_setting_table[it6505->afe_setting][2]);
> +       it6505_write(it6505, REG_SSC_CTRL0, 0x9E);
> +       it6505_write(it6505, REG_SSC_CTRL1, 0x1C);
> +       it6505_write(it6505, REG_SSC_CTRL2, 0x42);
> +       it6505_write(it6505, REG_BANK_SEL, 0x00);
> +}
> +
> +static void it6505_video_disable(struct it6505 *it6505)
> +{
> +       it6505_set_bits(it6505, REG_DATA_MUTE_CTRL, EN_VID_MUTE, EN_VID_MUTE);
> +       it6505_set_bits(it6505, REG_INFOFRAME_CTRL, EN_VID_CTRL_PKT, 0x00);
> +       it6505_set_bits(it6505, REG_RESET_CTRL, VIDEO_RESET, VIDEO_RESET);
> +}
> +
> +static void it6505_video_reset(struct it6505 *it6505)
> +{
> +       it6505_link_reset_step_train(it6505);
> +       it6505_set_bits(it6505, REG_DATA_MUTE_CTRL, EN_VID_MUTE, EN_VID_MUTE);
> +       it6505_set_bits(it6505, REG_INFOFRAME_CTRL, EN_VID_CTRL_PKT, 0x00);
> +       it6505_set_bits(it6505, REG_RESET_CTRL, VIDEO_RESET, VIDEO_RESET);
> +       it6505_set_bits(it6505, REG_501_FIFO_CTRL, RST_501_FIFO, RST_501_FIFO);
> +       it6505_set_bits(it6505, REG_501_FIFO_CTRL, RST_501_FIFO, 0x00);
> +       it6505_set_bits(it6505, REG_RESET_CTRL, VIDEO_RESET, 0x00);
> +}
> +
> +static void it6505_update_video_parameter(struct it6505 *it6505,
> +                                         const struct drm_display_mode *mode)
> +{
> +       it6505_clk_phase_adjustment(it6505, mode);
> +       it6505_video_disable(it6505);
> +}
> +
> +static bool it6505_audio_input(struct it6505 *it6505)
> +{
> +       int reg05, regbe;
> +
> +       reg05 = it6505_read(it6505, REG_RESET_CTRL);
> +       it6505_set_bits(it6505, REG_RESET_CTRL, AUDIO_RESET, 0x00);
> +       usleep_range(3000, 4000);
> +       regbe = it6505_read(it6505, REG_AUDIO_INPUT_FREQ);
> +       it6505_write(it6505, REG_RESET_CTRL, reg05);
> +
> +       return regbe != 0xFF;
> +}
> +
> +static void it6505_setup_audio_channel_status(struct it6505 *it6505)
> +{
> +       enum it6505_audio_sample_rate sample_rate = it6505->audio.sample_rate;
> +       u8 audio_word_length_map[] = { 0x02, 0x04, 0x03, 0x0B };
> +
> +       /* Channel Status */
> +       it6505_write(it6505, REG_IEC958_STS0, it6505->audio.type << 1);
> +       it6505_write(it6505, REG_IEC958_STS1, 0x00);
> +       it6505_write(it6505, REG_IEC958_STS2, 0x00);
> +       it6505_write(it6505, REG_IEC958_STS3, sample_rate);
> +       it6505_write(it6505, REG_IEC958_STS4, (~sample_rate << 4) |
> +                    audio_word_length_map[it6505->audio.word_length]);
> +}
> +
> +static void it6505_setup_audio_format(struct it6505 *it6505)
> +{
> +       /* I2S MODE */
> +       it6505_write(it6505, REG_AUDIO_FMT,
> +                    (it6505->audio.word_length << 5) |
> +                    (it6505->audio.i2s_data_sequence << 4) |
> +                    (it6505->audio.i2s_ws_channel << 3) |
> +                    (it6505->audio.i2s_data_delay << 2) |
> +                    (it6505->audio.i2s_justified << 1) |
> +                    it6505->audio.i2s_input_format);
> +       if (it6505->audio.select == SPDIF) {
> +               it6505_write(it6505, REG_AUDIO_FIFO_SEL, 0x00);
> +               /* 0x30 = 128*FS */
> +               it6505_set_bits(it6505, REG_AUX_OPT, 0xF0, 0x30);
> +       } else {
> +               it6505_write(it6505, REG_AUDIO_FIFO_SEL, 0xE4);
> +       }
> +
> +       it6505_write(it6505, REG_AUDIO_CTRL0, 0x20);
> +       it6505_write(it6505, REG_AUDIO_CTRL1, 0x00);
> +}
> +
> +static void it6505_enable_audio_source(struct it6505 *it6505)
> +{
> +       unsigned int audio_source_count;
> +
> +       audio_source_count = BIT(DIV_ROUND_UP(it6505->audio.channel_count, 2))
> +                                - 1;
> +
> +       audio_source_count |= it6505->audio.select << 4;
> +
> +       it6505_write(it6505, REG_AUDIO_SRC_CTRL, audio_source_count);
> +}
> +
> +static void it6505_enable_audio_infoframe(struct it6505 *it6505)
> +{
> +       struct device *dev = &it6505->client->dev;
> +       u8 audio_info_ca[] = { 0x00, 0x00, 0x01, 0x03, 0x07, 0x0B, 0x0F, 0x1F };
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "infoframe channel_allocation:0x%02x",
> +                            audio_info_ca[it6505->audio.channel_count - 1]);
> +
> +       it6505_write(it6505, REG_AUD_INFOFRAM_DB1, it6505->audio.channel_count
> +                    - 1);
> +       it6505_write(it6505, REG_AUD_INFOFRAM_DB2, 0x00);
> +       it6505_write(it6505, REG_AUD_INFOFRAM_DB3,
> +                    audio_info_ca[it6505->audio.channel_count - 1]);
> +       it6505_write(it6505, REG_AUD_INFOFRAM_DB4, 0x00);
> +       it6505_write(it6505, REG_AUD_INFOFRAM_SUM, 0x00);
> +
> +       /* Enable Audio InfoFrame */
> +       it6505_set_bits(it6505, REG_INFOFRAME_CTRL, EN_AUD_CTRL_PKT,
> +                       EN_AUD_CTRL_PKT);
> +}
> +
> +static void it6505_disable_audio(struct it6505 *it6505)
> +{
> +       it6505_set_bits(it6505, REG_DATA_MUTE_CTRL, EN_AUD_MUTE, EN_AUD_MUTE);
> +       it6505_set_bits(it6505, REG_AUDIO_SRC_CTRL, M_AUDIO_I2S_EN, 0x00);
> +       it6505_set_bits(it6505, REG_INFOFRAME_CTRL, EN_AUD_CTRL_PKT, 0x00);
> +       it6505_set_bits(it6505, REG_RESET_CTRL, AUDIO_RESET, AUDIO_RESET);
> +}
> +
> +static void it6505_enable_audio(struct it6505 *it6505)
> +{
> +       struct device *dev = &it6505->client->dev;
> +       int regbe;
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "start");
> +       it6505_disable_audio(it6505);
> +
> +       it6505_setup_audio_channel_status(it6505);
> +       it6505_setup_audio_format(it6505);
> +       it6505_enable_audio_source(it6505);
> +       it6505_enable_audio_infoframe(it6505);
> +
> +       it6505_write(it6505, REG_AUDIO_N_0_7, 0x00);
> +       it6505_write(it6505, REG_AUDIO_N_8_15, 0x80);
> +       it6505_write(it6505, REG_AUDIO_N_16_23, 0x00);
> +
> +       it6505_set_bits(it6505, REG_AUDIO_SRC_CTRL, AUDIO_FIFO_RESET,
> +                       AUDIO_FIFO_RESET);
> +       it6505_set_bits(it6505, REG_AUDIO_SRC_CTRL, AUDIO_FIFO_RESET, 0x00);
> +       it6505_set_bits(it6505, REG_RESET_CTRL, AUDIO_RESET, 0x00);
> +       regbe = it6505_read(it6505, REG_AUDIO_INPUT_FREQ);
> +       DRM_DEV_DEBUG_DRIVER(dev, "regbe:0x%02x audio input fs: %d.%d kHz",
> +                            regbe, 6750 / regbe, (6750 % regbe) * 10 / regbe);
> +       it6505_set_bits(it6505, REG_DATA_MUTE_CTRL, EN_AUD_MUTE, 0x00);
> +}
> +
> +static bool it6505_use_step_train_check(struct it6505 *it6505)
> +{
> +       if (it6505->link.revision >= 0x12)
> +               return it6505->dpcd[DP_TRAINING_AUX_RD_INTERVAL] >= 0x01;
> +
> +       return true;
> +}
> +
> +static void it6505_parse_link_capabilities(struct it6505 *it6505)
> +{
> +       struct device *dev = &it6505->client->dev;
> +       struct it6505_drm_dp_link *link = &it6505->link;
> +       int bcaps;
> +
> +       if (it6505->dpcd[0] == 0) {
> +               it6505_aux_on(it6505);
> +               it6505_get_dpcd(it6505, DP_DPCD_REV, it6505->dpcd,
> +                               ARRAY_SIZE(it6505->dpcd));
> +       }
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "DPCD Rev.: %d.%d",
> +                            link->revision >> 4, link->revision & 0x0F);
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "Sink max link rate: %d.%02d Gbps per lane",
> +                            link->rate / 100000, link->rate / 1000 % 100);
> +
> +       it6505->link_rate_bw_code = drm_dp_link_rate_to_bw_code(link->rate);
> +       DRM_DEV_DEBUG_DRIVER(dev, "link rate bw code:0x%02x",
> +                            it6505->link_rate_bw_code);
> +       it6505->link_rate_bw_code = min((int)it6505->link_rate_bw_code,
> +                                       MAX_LINK_RATE);
> +
> +       it6505->lane_count = link->num_lanes;
> +       DRM_DEV_DEBUG_DRIVER(dev, "Sink support %d lanes training",
> +                            it6505->lane_count);
> +       it6505->lane_count = min((int)it6505->lane_count, MAX_LANE_COUNT);
> +
> +       it6505->branch_device = drm_dp_is_branch(it6505->dpcd);
> +       DRM_DEV_DEBUG_DRIVER(dev, "Sink %sbranch device",
> +                            it6505->branch_device ? "" : "Not ");
> +
> +       it6505->enable_enhanced_frame = link->capabilities;
> +       DRM_DEV_DEBUG_DRIVER(dev, "Sink %sSupport Enhanced Framing",
> +                            it6505->enable_enhanced_frame ? "" : "Not ");
> +
> +       it6505->enable_ssc = (it6505->dpcd[DP_MAX_DOWNSPREAD] &
> +                               DP_MAX_DOWNSPREAD_0_5);
> +       DRM_DEV_DEBUG_DRIVER(dev, "Maximum Down-Spread: %s, %ssupport SSC!",
> +                            it6505->enable_ssc ? "0.5" : "0",
> +                            it6505->enable_ssc ? "" : "Not ");
> +
> +       it6505->step_train = it6505_use_step_train_check(it6505);
> +       if (it6505->step_train)
> +               DRM_DEV_DEBUG_DRIVER(dev, "auto train fail, will step train");
> +
> +       bcaps = it6505_dpcd_read(it6505, DP_AUX_HDCP_BCAPS);
> +       DRM_DEV_DEBUG_DRIVER(dev, "bcaps:0x%02x", bcaps);
> +       if (bcaps & DP_BCAPS_HDCP_CAPABLE) {
> +               it6505->is_repeater = (bcaps & DP_BCAPS_REPEATER_PRESENT);
> +               DRM_DEV_DEBUG_DRIVER(dev, "Support HDCP! Downstream is %s!",
> +                                    it6505->is_repeater ? "repeater" :
> +                                    "receiver");
> +       } else {
> +               DRM_DEV_DEBUG_DRIVER(dev, "Sink not support HDCP!");
> +               it6505->hdcp_desired = false;
> +       }
> +       DRM_DEV_DEBUG_DRIVER(dev, "HDCP %s",
> +                            it6505->hdcp_desired ? "desired" : "undesired");
> +}
> +
> +static void it6505_setup_ssc(struct it6505 *it6505)
> +{
> +       it6505_set_bits(it6505, REG_TRAIN_CTRL0, SPREAD_AMP_5,
> +                       it6505->enable_ssc ? SPREAD_AMP_5 : 0x00);
> +       if (it6505->enable_ssc) {
> +               it6505_write(it6505, REG_BANK_SEL, 0x01);
> +               it6505_write(it6505, REG_SSC_CTRL0, 0x9E);
> +               it6505_write(it6505, REG_SSC_CTRL1, 0x1C);
> +               it6505_write(it6505, REG_SSC_CTRL2, 0x42);
> +               it6505_write(it6505, REG_BANK_SEL, 0x00);
> +               it6505_write(it6505, REG_SP_CTRL0, 0x07);
> +               it6505_write(it6505, REG_IP_CTRL1, 0x29);
> +               it6505_write(it6505, REG_IP_CTRL2, 0x03);
> +               /* Stamp Interrupt Step */
> +               it6505_set_bits(it6505, REG_TIME_STMP_CTRL, M_STAMP_STEP,
> +                               0x10);
> +               it6505_dpcd_write(it6505, DP_DOWNSPREAD_CTRL,
> +                                 DP_SPREAD_AMP_0_5);
> +       } else {
> +               it6505_dpcd_write(it6505, DP_DOWNSPREAD_CTRL, 0x00);
> +               it6505_set_bits(it6505, REG_TIME_STMP_CTRL, M_STAMP_STEP,
> +                               0x00);
> +       }
> +}
> +
> +static inline void it6505_link_rate_setup(struct it6505 *it6505)
> +{
> +       it6505_set_bits(it6505, REG_TRAIN_CTRL0, FORCE_LBR,
> +                       (it6505->link_rate_bw_code == RBR) ? FORCE_LBR : 0x00);
> +       it6505_set_bits(it6505, REG_LINK_DRV, DRV_HS,
> +                       (it6505->link_rate_bw_code == RBR) ? 0x00 : DRV_HS);
> +}
> +
> +static void it6505_lane_count_setup(struct it6505 *it6505)
> +{
> +       it6505_get_extcon_property(it6505);
> +       it6505_set_bits(it6505, REG_TRAIN_CTRL0, LANE_SWAP,
> +                       it6505->lane_swap ? LANE_SWAP : 0x00);
> +       it6505_set_bits(it6505, REG_TRAIN_CTRL0, LANE_COUNT_MASK,
> +                       (it6505->lane_count - 1) << 1);
> +}
> +
> +static void it6505_link_training_setup(struct it6505 *it6505)
> +{
> +       struct device *dev = &it6505->client->dev;
> +
> +       if (it6505->enable_enhanced_frame)
> +               it6505_set_bits(it6505, REG_DATA_MUTE_CTRL,
> +                               ENABLE_ENHANCED_FRAME, ENABLE_ENHANCED_FRAME);
> +
> +       it6505_link_rate_setup(it6505);
> +       it6505_lane_count_setup(it6505);
> +       it6505_setup_ssc(it6505);
> +       DRM_DEV_DEBUG_DRIVER(dev,
> +                            "%s, %d lanes, %sable ssc, %sable enhanced frame",
> +                            it6505->link_rate_bw_code != RBR ? "HBR" : "RBR",
> +                            it6505->lane_count,
> +                            it6505->enable_ssc ? "en" : "dis",
> +                            it6505->enable_enhanced_frame ? "en" : "dis");
> +}
> +
> +static bool it6505_link_start_auto_train(struct it6505 *it6505)
> +{
> +       int timeout = 500, link_training_state;
> +       bool state = false;
> +
> +       mutex_lock(&it6505->aux_lock);
> +       it6505_set_bits(it6505, REG_TRAIN_CTRL0,
> +                               FORCE_CR_DONE | FORCE_EQ_DONE, 0x00);
> +       it6505_write(it6505, REG_TRAIN_CTRL1, FORCE_RETRAIN);
> +       it6505_write(it6505, REG_TRAIN_CTRL1, AUTO_TRAIN);
> +
> +       while (timeout > 0) {
> +               usleep_range(1000, 2000);
> +               link_training_state = it6505_read(it6505, REG_LINK_TRAIN_STS);
> +
> +               if ((link_training_state > 0) &&
> +                   (link_training_state & LINK_STATE_NORP)) {
> +                       state = true;
> +                       goto unlock;
> +               }
> +
> +               timeout--;
> +       }
> +unlock:
> +       mutex_unlock(&it6505->aux_lock);
> +
> +       return state;
> +}
> +
> +static int it6505_drm_dp_link_configure(struct it6505 *it6505)
> +{
> +       u8 values[2];
> +       int err;
> +       struct drm_dp_aux *aux = &it6505->aux;
> +
> +       values[0] = it6505->link_rate_bw_code;
> +       values[1] = it6505->lane_count;
> +
> +       if (it6505->enable_enhanced_frame)
> +               values[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
> +
> +       err = drm_dp_dpcd_write(aux, DP_LINK_BW_SET, values, sizeof(values));
> +       if (err < 0)
> +               return err;
> +
> +       return 0;
> +}
> +
> +static bool it6505_check_voltage_swing_max(u8 lane_voltage_swing_pre_emphasis)
> +{
> +       return ((lane_voltage_swing_pre_emphasis & 0x03) == MAX_CR_LEVEL);
> +}
> +
> +static bool it6505_check_pre_emphasis_max(u8 lane_voltage_swing_pre_emphasis)
> +{
> +       return ((lane_voltage_swing_pre_emphasis & 0x03) == MAX_EQ_LEVEL);
> +}
> +
> +static bool it6505_check_max_voltage_swing_reached(u8 *lane_voltage_swing,
> +                                                  u8 lane_count)
> +{
> +       u8 i;
> +
> +       for (i = 0; i < lane_count; i++) {
> +               if (lane_voltage_swing[i] & DP_TRAIN_MAX_SWING_REACHED)
> +                       return true;
> +       }
> +
> +       return false;
> +}
> +
> +static bool it6505_step_train_lane_voltage_pre_emphasis_set(
> +       struct it6505 *it6505,
> +       struct it6505_step_train_para *lane_voltage_pre_emphasis,
> +       u8 *lane_voltage_pre_emphasis_set)
> +{
> +       u8 i;
> +
> +       for (i = 0; i < it6505->lane_count; i++) {
> +               lane_voltage_pre_emphasis->voltage_swing[i] &= 0x03;
> +               lane_voltage_pre_emphasis_set[i] =
> +                       lane_voltage_pre_emphasis->voltage_swing[i];
> +               if (it6505_check_voltage_swing_max(
> +                           lane_voltage_pre_emphasis->voltage_swing[i]))
> +                       lane_voltage_pre_emphasis_set[i] |=
> +                               DP_TRAIN_MAX_SWING_REACHED;
> +
> +               lane_voltage_pre_emphasis->pre_emphasis[i] &= 0x03;
> +               lane_voltage_pre_emphasis_set[i] |=
> +                       lane_voltage_pre_emphasis->pre_emphasis[i]
> +                       << DP_TRAIN_PRE_EMPHASIS_SHIFT;
> +               if (it6505_check_pre_emphasis_max(
> +                           lane_voltage_pre_emphasis->pre_emphasis[i]))
> +                       lane_voltage_pre_emphasis_set[i] |=
> +                               DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
> +               it6505_dpcd_write(it6505, DP_TRAINING_LANE0_SET + i,
> +                                 lane_voltage_pre_emphasis_set[i]);
> +
> +               if (lane_voltage_pre_emphasis_set[i] !=
> +                   it6505_dpcd_read(it6505, DP_TRAINING_LANE0_SET + i))
> +                       return false;
> +       }
> +
> +       return true;
> +}
> +
> +static bool
> +it6505_step_cr_train(struct it6505 *it6505,
> +                    struct it6505_step_train_para *lane_voltage_pre_emphasis)
> +{
> +       u8 loop_count = 0, i = 0, j;
> +       u8 link_status[DP_LINK_STATUS_SIZE] = { 0 };
> +       u8 lane_level_config[MAX_LANE_COUNT] = { 0 };
> +       int pre_emphasis_adjust = -1, voltage_swing_adjust = -1;
> +       const struct drm_dp_aux *aux = &it6505->aux;
> +
> +       it6505_dpcd_write(it6505, DP_DOWNSPREAD_CTRL,
> +                         it6505->enable_ssc ? DP_SPREAD_AMP_0_5 : 0x00);
> +       it6505_dpcd_write(it6505, DP_TRAINING_PATTERN_SET,
> +                         DP_TRAINING_PATTERN_1);
> +
> +       while (loop_count < 5 && i < 10) {
> +               i++;
> +               if (!it6505_step_train_lane_voltage_pre_emphasis_set(
> +                           it6505, lane_voltage_pre_emphasis,
> +                           lane_level_config))
> +                       continue;
> +               drm_dp_link_train_clock_recovery_delay(aux, it6505->dpcd);
> +               drm_dp_dpcd_read_link_status(&it6505->aux, link_status);
> +
> +               if (drm_dp_clock_recovery_ok(link_status, it6505->lane_count)) {
> +                       it6505_set_bits(it6505, REG_TRAIN_CTRL0, FORCE_CR_DONE,
> +                                       FORCE_CR_DONE);
> +                       return true;
> +               }
> +               DRM_DEV_DEBUG_DRIVER(&it6505->client->dev, "cr not done");
> +
> +               if (it6505_check_max_voltage_swing_reached(lane_level_config,
> +                                                          it6505->lane_count))
> +                       goto cr_train_fail;
> +
> +               for (j = 0; j < it6505->lane_count; j++) {
> +                       lane_voltage_pre_emphasis->voltage_swing[j] =
> +                               drm_dp_get_adjust_request_voltage(link_status,
> +                                                                 j) >>
> +                               DP_TRAIN_VOLTAGE_SWING_SHIFT;
> +                       lane_voltage_pre_emphasis->pre_emphasis[j] =
> +                               drm_dp_get_adjust_request_pre_emphasis(
> +                                       link_status, j) >>
> +                               DP_TRAIN_PRE_EMPHASIS_SHIFT;
> +                       if ((voltage_swing_adjust ==
> +                            lane_voltage_pre_emphasis->voltage_swing[j]) &&
> +                           (pre_emphasis_adjust ==
> +                            lane_voltage_pre_emphasis->pre_emphasis[j])) {
> +                               loop_count++;
> +                               continue;
> +                       }
> +
> +                       voltage_swing_adjust =
> +                               lane_voltage_pre_emphasis->voltage_swing[j];
> +                       pre_emphasis_adjust =
> +                               lane_voltage_pre_emphasis->pre_emphasis[j];
> +                       loop_count = 0;
> +
> +                       if (voltage_swing_adjust + pre_emphasis_adjust >
> +                           MAX_EQ_LEVEL)
> +                               lane_voltage_pre_emphasis->voltage_swing[j] =
> +                                       MAX_EQ_LEVEL -
> +                                       lane_voltage_pre_emphasis
> +                                               ->pre_emphasis[j];
> +               }
> +       }
> +
> +cr_train_fail:
> +       it6505_dpcd_write(it6505, DP_TRAINING_PATTERN_SET,
> +                         DP_TRAINING_PATTERN_DISABLE);
> +
> +       return false;
> +}
> +
> +static bool
> +it6505_step_eq_train(struct it6505 *it6505,
> +                    struct it6505_step_train_para *lane_voltage_pre_emphasis)
> +{
> +       u8 loop_count = 0, i, link_status[DP_LINK_STATUS_SIZE] = { 0 };
> +       u8 lane_level_config[MAX_LANE_COUNT] = { 0 };
> +       const struct drm_dp_aux *aux = &it6505->aux;
> +
> +       it6505_dpcd_write(it6505, DP_TRAINING_PATTERN_SET,
> +                         DP_TRAINING_PATTERN_2);
> +
> +       while (loop_count < 6) {
> +               loop_count++;
> +
> +               if (!it6505_step_train_lane_voltage_pre_emphasis_set(
> +                           it6505, lane_voltage_pre_emphasis,
> +                           lane_level_config))
> +                       continue;
> +
> +               drm_dp_link_train_channel_eq_delay(aux, it6505->dpcd);
> +               drm_dp_dpcd_read_link_status(&it6505->aux, link_status);
> +
> +               if (!drm_dp_clock_recovery_ok(link_status, it6505->lane_count))
> +                       goto eq_train_fail;
> +
> +               if (drm_dp_channel_eq_ok(link_status, it6505->lane_count)) {
> +                       it6505_dpcd_write(it6505, DP_TRAINING_PATTERN_SET,
> +                                         DP_TRAINING_PATTERN_DISABLE);
> +                       it6505_set_bits(it6505, REG_TRAIN_CTRL0, FORCE_EQ_DONE,
> +                                       FORCE_EQ_DONE);
> +                       return true;
> +               }
> +               DRM_DEV_DEBUG_DRIVER(&it6505->client->dev, "eq not done");
> +
> +               for (i = 0; i < it6505->lane_count; i++) {
> +                       lane_voltage_pre_emphasis->voltage_swing[i] =
> +                               drm_dp_get_adjust_request_voltage(link_status,
> +                                                                 i) >>
> +                               DP_TRAIN_VOLTAGE_SWING_SHIFT;
> +                       lane_voltage_pre_emphasis->pre_emphasis[i] =
> +                               drm_dp_get_adjust_request_pre_emphasis(
> +                                       link_status, i) >>
> +                               DP_TRAIN_PRE_EMPHASIS_SHIFT;
> +
> +                       if (lane_voltage_pre_emphasis->voltage_swing[i] +
> +                                   lane_voltage_pre_emphasis->pre_emphasis[i] >
> +                           MAX_EQ_LEVEL)
> +                               lane_voltage_pre_emphasis->voltage_swing[i] =
> +                                       0x03 - lane_voltage_pre_emphasis
> +                                                      ->pre_emphasis[i];
> +               }
> +       }
> +
> +eq_train_fail:
> +       it6505_dpcd_write(it6505, DP_TRAINING_PATTERN_SET,
> +                         DP_TRAINING_PATTERN_DISABLE);
> +       return false;
> +}
> +
> +static bool it6505_link_start_step_train(struct it6505 *it6505)
> +{
> +       int err;
> +       struct it6505_step_train_para lane_voltage_pre_emphasis = {
> +               .voltage_swing = { 0 },
> +               .pre_emphasis = { 0 },
> +       };
> +
> +       DRM_DEV_DEBUG_DRIVER(&it6505->client->dev, "start");
> +       err = it6505_drm_dp_link_configure(it6505);
> +
> +       if (err < 0)
> +               return false;
> +       if (!it6505_step_cr_train(it6505, &lane_voltage_pre_emphasis))
> +               return false;
> +       if (!it6505_step_eq_train(it6505, &lane_voltage_pre_emphasis))
> +               return false;
> +       return true;
> +}
> +
> +static bool it6505_get_video_status(struct it6505 *it6505)
> +{
> +       int reg_0d;
> +
> +       reg_0d = it6505_read(it6505, REG_SYSTEM_STS);
> +
> +       if (reg_0d < 0)
> +               return false;
> +
> +       return reg_0d & VIDEO_STB;
> +}
> +
> +static void it6505_reset_hdcp(struct it6505 *it6505)
> +{
> +       it6505->hdcp_status = HDCP_AUTH_IDLE;
> +       /* Disable CP_Desired */
> +       it6505_set_bits(it6505, REG_HDCP_CTRL1, HDCP_CP_ENABLE, 0x00);
> +       it6505_set_bits(it6505, REG_RESET_CTRL, HDCP_RESET, HDCP_RESET);
> +}
> +
> +static void it6505_start_hdcp(struct it6505 *it6505)
> +{
> +       struct device *dev = &it6505->client->dev;
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "start");
> +       it6505_reset_hdcp(it6505);
> +       queue_delayed_work(system_wq, &it6505->hdcp_work,
> +                          msecs_to_jiffies(2400));
> +}
> +
> +static void it6505_stop_hdcp(struct it6505 *it6505)
> +{
> +       it6505_reset_hdcp(it6505);
> +       cancel_delayed_work(&it6505->hdcp_work);
> +}
> +
> +static bool it6505_hdcp_is_ksv_valid(u8 *ksv)
> +{
> +       int i, ones = 0;
> +
> +       /* KSV has 20 1's and 20 0's */
> +       for (i = 0; i < DRM_HDCP_KSV_LEN; i++)
> +               ones += hweight8(ksv[i]);
> +       if (ones != 20)
> +               return false;
> +       return true;
> +}
> +
> +static void it6505_hdcp_part1_auth(struct it6505 *it6505)
> +{
> +       struct device *dev = &it6505->client->dev;
> +       u8 hdcp_bcaps;
> +
> +       it6505_set_bits(it6505, REG_RESET_CTRL, HDCP_RESET, 0x00);
> +       /* Disable CP_Desired */
> +       it6505_set_bits(it6505, REG_HDCP_CTRL1, HDCP_CP_ENABLE, 0x00);
> +
> +       usleep_range(1000, 1500);
> +       hdcp_bcaps = it6505_dpcd_read(it6505, DP_AUX_HDCP_BCAPS);
> +       DRM_DEV_DEBUG_DRIVER(dev, "DPCD[0x68028]: 0x%02x",
> +                            hdcp_bcaps);
> +
> +       if (!hdcp_bcaps)
> +               return;
> +
> +       /* clear the repeater List Chk Done and fail bit */
> +       it6505_set_bits(it6505, REG_HDCP_TRIGGER,
> +                       HDCP_TRIGGER_KSV_DONE | HDCP_TRIGGER_KSV_FAIL,
> +                       0x00);
> +
> +       /* Enable An Generator */
> +       it6505_set_bits(it6505, REG_HDCP_CTRL2, HDCP_AN_GEN, HDCP_AN_GEN);
> +       /* delay1ms(10);*/
> +       usleep_range(10000, 15000);
> +       /* Stop An Generator */
> +       it6505_set_bits(it6505, REG_HDCP_CTRL2, HDCP_AN_GEN, 0x00);
> +
> +       it6505_set_bits(it6505, REG_HDCP_CTRL1, HDCP_CP_ENABLE, HDCP_CP_ENABLE);
> +
> +       it6505_set_bits(it6505, REG_HDCP_TRIGGER, HDCP_TRIGGER_START,
> +                       HDCP_TRIGGER_START);
> +
> +       it6505->hdcp_status = HDCP_AUTH_GOING;
> +}
> +
> +static int it6505_sha1_digest(struct it6505 *it6505, u8 *sha1_input,
> +                             unsigned int size, u8 *output_av)
> +{
> +       struct shash_desc *desc;
> +       struct crypto_shash *tfm;
> +       int err;
> +       struct device *dev = &it6505->client->dev;
> +
> +       tfm = crypto_alloc_shash("sha1", 0, 0);
> +       if (IS_ERR(tfm)) {
> +               DRM_DEV_ERROR(dev, "crypto_alloc_shash sha1 failed");
> +               return PTR_ERR(tfm);
> +       }
> +       desc = kzalloc(sizeof(*desc) + crypto_shash_descsize(tfm), GFP_KERNEL);
> +       if (!desc) {
> +               crypto_free_shash(tfm);
> +               return -ENOMEM;
> +       }
> +
> +       desc->tfm = tfm;
> +       err = crypto_shash_digest(desc, sha1_input, size, output_av);
> +       if (err)
> +               DRM_DEV_ERROR(dev, "crypto_shash_digest sha1 failed");
> +
> +       crypto_free_shash(tfm);
> +       kfree(desc);
> +       return err;
> +}
> +
> +static int it6505_setup_sha1_input(struct it6505 *it6505, u8 *sha1_input)
> +{
> +       struct device *dev = &it6505->client->dev;
> +       u8 binfo[2];
> +       int down_stream_count, i, err, msg_count = 0;
> +
> +       err = it6505_get_dpcd(it6505, DP_AUX_HDCP_BINFO, binfo,
> +                             ARRAY_SIZE(binfo));
> +
> +       if (err < 0) {
> +               DRM_DEV_ERROR(dev, "Read binfo value Fail");
> +               return err;
> +       }
> +
> +       down_stream_count = binfo[0] & 0x7F;
> +       DRM_DEV_DEBUG_DRIVER(dev, "binfo:0x%*ph", (int)ARRAY_SIZE(binfo),
> +                            binfo);
> +
> +       if ((binfo[0] & BIT(7)) || (binfo[1] & BIT(3))) {
> +               DRM_DEV_ERROR(dev, "HDCP max cascade device exceed");
> +               return 0;
> +       }
> +
> +       if (!down_stream_count ||
> +           (down_stream_count > MAX_HDCP_DOWN_STREAM_COUNT)) {
> +               DRM_DEV_ERROR(dev, "HDCP down stream count Error %d",
> +                             down_stream_count);
> +               return 0;
> +       }
> +
> +       for (i = 0; i < down_stream_count; i++) {
> +               err = it6505_get_dpcd(it6505, DP_AUX_HDCP_KSV_FIFO +
> +                                     (i % 3) * DRM_HDCP_KSV_LEN,
> +                                     sha1_input + msg_count,
> +                                     DRM_HDCP_KSV_LEN);
> +
> +               if (err < 0)
> +                       return err;
> +
> +               msg_count += 5;
> +       }
> +
> +       it6505->hdcp_down_stream_count = down_stream_count;
> +       sha1_input[msg_count++] = binfo[0];
> +       sha1_input[msg_count++] = binfo[1];
> +
> +       it6505_set_bits(it6505, REG_HDCP_CTRL2, HDCP_EN_M0_READ,
> +                       HDCP_EN_M0_READ);
> +
> +       err = regmap_bulk_read(it6505->regmap, REG_M0_0_7,
> +                              sha1_input + msg_count, 8);
> +
> +       it6505_set_bits(it6505, REG_HDCP_CTRL2, HDCP_EN_M0_READ, 0x00);
> +
> +       if (err < 0) {
> +               DRM_DEV_ERROR(dev, " Warning, Read M value Fail");
> +               return err;
> +       }
> +
> +       msg_count += 8;
> +
> +       return msg_count;
> +}
> +
> +static bool it6505_hdcp_part2_ksvlist_check(struct it6505 *it6505)
> +{
> +       struct device *dev = &it6505->client->dev;
> +       u8 av[5][4], bv[5][4];
> +       int i, err;
> +
> +       i = it6505_setup_sha1_input(it6505, it6505->sha1_input);
> +       if (i <= 0) {
> +               DRM_DEV_ERROR(dev, "SHA-1 Input length error %d", i);
> +               return false;
> +       }
> +
> +       it6505_sha1_digest(it6505, it6505->sha1_input, i, (u8 *)av);
> +
> +       err = it6505_get_dpcd(it6505, DP_AUX_HDCP_V_PRIME(0), (u8 *)bv,
> +                             sizeof(bv));
> +
> +       if (err < 0) {
> +               DRM_DEV_ERROR(dev, "Read V' value Fail");
> +               return false;
> +       }
> +
> +       for (i = 0; i < 5; i++)
> +               if ((bv[i][3] != av[i][0]) || (bv[i][2] != av[i][1]) ||
> +                   (bv[i][1] != av[i][2]) || (bv[i][0] != av[i][3]))
> +                       return false;
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "V' all match!!");
> +       return true;
> +}
> +
> +static void it6505_hdcp_wait_ksv_list(struct work_struct *work)
> +{
> +       struct it6505 *it6505 = container_of(work, struct it6505,
> +                                            hdcp_wait_ksv_list);
> +       struct device *dev = &it6505->client->dev;
> +       unsigned int timeout = 5000;
> +       u8 bstatus = 0;
> +       bool ksv_list_check;
> +
> +       timeout /= 20;
> +       while (timeout > 0) {
> +               if (!it6505_get_sink_hpd_status(it6505))
> +                       return;
> +
> +               bstatus = it6505_dpcd_read(it6505, DP_AUX_HDCP_BSTATUS);
> +
> +               if (bstatus & DP_BSTATUS_READY)
> +                       break;
> +
> +               msleep(20);
> +               timeout--;
> +       }
> +
> +       if (timeout == 0) {
> +               DRM_DEV_DEBUG_DRIVER(dev, "timeout and ksv list wait failed");
> +               goto timeout;
> +       }
> +
> +       ksv_list_check = it6505_hdcp_part2_ksvlist_check(it6505);
> +       DRM_DEV_DEBUG_DRIVER(dev, "ksv list ready, ksv list check %s",
> +                            ksv_list_check ? "pass" : "fail");
> +       if (ksv_list_check) {
> +               it6505_set_bits(it6505, REG_HDCP_TRIGGER,
> +                               HDCP_TRIGGER_KSV_DONE, HDCP_TRIGGER_KSV_DONE);
> +               return;
> +       }
> +timeout:
> +       it6505_set_bits(it6505, REG_HDCP_TRIGGER,
> +                       HDCP_TRIGGER_KSV_DONE | HDCP_TRIGGER_KSV_FAIL,
> +                       HDCP_TRIGGER_KSV_DONE | HDCP_TRIGGER_KSV_FAIL);
> +}
> +
> +static void it6505_hdcp_work(struct work_struct *work)
> +{
> +       struct it6505 *it6505 = container_of(work, struct it6505,
> +                                            hdcp_work.work);
> +       struct device *dev = &it6505->client->dev;
> +       int ret;
> +       u8 link_status[DP_LINK_STATUS_SIZE] = { 0 };
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "start");
> +
> +       if (!it6505_get_sink_hpd_status(it6505))
> +               return;
> +
> +       ret = drm_dp_dpcd_read_link_status(&it6505->aux, link_status);
> +       DRM_DEV_DEBUG_DRIVER(dev, "ret: %d link_status: %*ph", ret,
> +                            (int)sizeof(link_status), link_status);
> +
> +       if ((ret < 0) || !drm_dp_channel_eq_ok(link_status, it6505->lane_count)
> +           || !it6505_get_video_status(it6505)) {
> +               DRM_DEV_DEBUG_DRIVER(dev, "link train not done or no video");
> +               return;
> +       }
> +
> +       ret = it6505_get_dpcd(it6505, DP_AUX_HDCP_BKSV, it6505->bksvs,
> +                             ARRAY_SIZE(it6505->bksvs));
> +       if (ret < 0) {
> +               DRM_DEV_ERROR(dev, "fail to get bksv  ret: %d", ret);
> +               it6505_set_bits(it6505, REG_HDCP_TRIGGER,
> +                               HDCP_TRIGGER_KSV_FAIL, HDCP_TRIGGER_KSV_FAIL);
> +       }
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "bksv = 0x%*ph",
> +                            (int)ARRAY_SIZE(it6505->bksvs), it6505->bksvs);
> +
> +       if (!it6505_hdcp_is_ksv_valid(it6505->bksvs)) {
> +               DRM_DEV_ERROR(dev, "Display Port bksv not valid");
> +               it6505_set_bits(it6505, REG_HDCP_TRIGGER,
> +                               HDCP_TRIGGER_KSV_FAIL, HDCP_TRIGGER_KSV_FAIL);
> +       }
> +
> +       it6505_hdcp_part1_auth(it6505);
> +}
> +
> +static void it6505_show_hdcp_info(struct it6505 *it6505)
> +{
> +       struct device *dev = &it6505->client->dev;
> +       int i;
> +       u8 *sha1 = it6505->sha1_input;
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "hdcp_status: %d is_repeater: %d",
> +                            it6505->hdcp_status, it6505->is_repeater);
> +       DRM_DEV_DEBUG_DRIVER(dev, "bksv = 0x%*ph",
> +                            (int)ARRAY_SIZE(it6505->bksvs), it6505->bksvs);
> +
> +       if (it6505->is_repeater) {
> +               DRM_DEV_DEBUG_DRIVER(dev, "hdcp_down_stream_count: %d",
> +                                    it6505->hdcp_down_stream_count);
> +               DRM_DEV_DEBUG_DRIVER(dev, "sha1_input: 0x%*ph",
> +                                    (int)ARRAY_SIZE(it6505->sha1_input),
> +                                    it6505->sha1_input);
> +               for (i = 0; i < it6505->hdcp_down_stream_count; i++) {
> +                       DRM_DEV_DEBUG_DRIVER(dev, "KSV_%d = 0x%*ph", i,
> +                                            DRM_HDCP_KSV_LEN, sha1);
> +                       sha1 += DRM_HDCP_KSV_LEN;
> +               }
> +               DRM_DEV_DEBUG_DRIVER(dev, "binfo: 0x%2ph M0: 0x%8ph",
> +                                    sha1, sha1 + 2);
> +       }
> +}
> +
> +static void it6505_stop_link_train(struct it6505 *it6505)
> +{
> +       it6505->link_state = LINK_IDLE;
> +       cancel_work_sync(&it6505->link_works);
> +       it6505_write(it6505, REG_TRAIN_CTRL1, FORCE_RETRAIN);
> +}
> +
> +static void it6505_link_train_ok(struct it6505 *it6505)
> +{
> +       struct device *dev = &it6505->client->dev;
> +
> +       it6505->link_state = LINK_OK;
> +       /* disalbe mute enable avi info frame */
> +       it6505_set_bits(it6505, REG_DATA_MUTE_CTRL, EN_VID_MUTE, 0x00);
> +       it6505_set_bits(it6505, REG_INFOFRAME_CTRL,
> +                       EN_VID_CTRL_PKT, EN_VID_CTRL_PKT);
> +
> +       if (it6505_audio_input(it6505)) {
> +               DRM_DEV_DEBUG_DRIVER(dev, "Enable audio!");
> +               it6505_enable_audio(it6505);
> +       }
> +
> +       if (it6505->hdcp_desired)
> +               it6505_start_hdcp(it6505);
> +}
> +
> +static void it6505_link_step_train_process(struct it6505 *it6505)
> +{
> +       struct device *dev = &it6505->client->dev;
> +       int ret, i, step_retry = 3;
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "Start step train");
> +
> +       if (it6505->sink_count == 0) {
> +               DRM_DEV_DEBUG_DRIVER(dev, "it6505->sink_count:%d, force eq",
> +                                    it6505->sink_count);
> +               it6505_set_bits(it6505, REG_TRAIN_CTRL0, FORCE_EQ_DONE,
> +                               FORCE_EQ_DONE);
> +               return;
> +       }
> +
> +       if (!it6505->step_train) {
> +               DRM_DEV_DEBUG_DRIVER(dev, "not support step train");
> +               return;
> +       }
> +
> +       /* step training start here */
> +       for (i = 0; i < step_retry; i++) {
> +               it6505_link_reset_step_train(it6505);
> +               ret = it6505_link_start_step_train(it6505);
> +               DRM_DEV_DEBUG_DRIVER(dev, "step train %s, retry:%d times",
> +                                    ret ? "pass" : "failed", i + 1);
> +               if (ret) {
> +                       it6505_link_train_ok(it6505);
> +                       return;
> +               }
> +       }
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "training fail");
> +       it6505->link_state = LINK_IDLE;
> +       it6505_video_reset(it6505);
> +}
> +
> +static void it6505_link_training_work(struct work_struct *work)
> +{
> +       struct it6505 *it6505 = container_of(work, struct it6505, link_works);
> +       struct device *dev = &it6505->client->dev;
> +       int ret;
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "it6505->sink_count: %d",
> +                            it6505->sink_count);
> +
> +       if (!it6505_get_sink_hpd_status(it6505))
> +               return;
> +
> +       it6505_link_training_setup(it6505);
> +       it6505_reset_hdcp(it6505);
> +       it6505_aux_reset(it6505);
> +
> +       if (it6505->auto_train_retry < 1) {
> +               it6505_link_step_train_process(it6505);
> +               return;
> +       }
> +
> +       ret = it6505_link_start_auto_train(it6505);
> +       DRM_DEV_DEBUG_DRIVER(dev, "auto train %s, auto_train_retry: %d",
> +                            ret ? "pass" : "failed", it6505->auto_train_retry);
> +       it6505->auto_train_retry--;
> +
> +       if (ret) {
> +               it6505_link_train_ok(it6505);
> +               return;
> +       }
> +
> +       it6505_dump(it6505);
> +}
> +
> +static void it6505_plugged_status_to_codec(struct it6505 *it6505)
> +{
> +       enum drm_connector_status status = it6505->connector_status;
> +
> +       if (it6505->plugged_cb && it6505->codec_dev)
> +               it6505->plugged_cb(it6505->codec_dev,
> +                                  status == connector_status_connected);
> +}
> +
> +static int it6505_process_hpd_irq(struct it6505 *it6505)
> +{
> +       struct device *dev = &it6505->client->dev;
> +       int ret, dpcd_sink_count, dp_irq_vector, bstatus;
> +       u8 link_status[DP_LINK_STATUS_SIZE];
> +
> +       if (!it6505_get_sink_hpd_status(it6505)) {
> +               DRM_DEV_DEBUG_DRIVER(dev, "HPD_IRQ HPD low");
> +               it6505->sink_count = 0;
> +               return 0;
> +       }
> +
> +       ret = it6505_dpcd_read(it6505, DP_SINK_COUNT);
> +       if (ret < 0)
> +               return ret;
> +
> +       dpcd_sink_count = DP_GET_SINK_COUNT(ret);
> +       DRM_DEV_DEBUG_DRIVER(dev, "dpcd_sink_count: %d it6505->sink_count:%d",
> +                            dpcd_sink_count, it6505->sink_count);
> +
> +       if (it6505->branch_device && dpcd_sink_count != it6505->sink_count) {
> +               memset(it6505->dpcd, 0, sizeof(it6505->dpcd));
> +               it6505->sink_count = dpcd_sink_count;
> +               kfree(it6505->edid);
> +               it6505->edid = NULL;
> +               it6505_reset_logic(it6505);
> +               it6505_int_mask_enable(it6505);
> +               it6505_init(it6505);
> +               return 0;
> +       }
> +
> +       dp_irq_vector = it6505_dpcd_read(it6505, DP_DEVICE_SERVICE_IRQ_VECTOR);
> +       if (dp_irq_vector < 0)
> +               return dp_irq_vector;
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "dp_irq_vector = 0x%02x", dp_irq_vector);
> +
> +       if (dp_irq_vector & DP_CP_IRQ) {
> +               it6505_set_bits(it6505, REG_HDCP_TRIGGER, HDCP_TRIGGER_CPIRQ,
> +                               HDCP_TRIGGER_CPIRQ);
> +
> +               bstatus = it6505_dpcd_read(it6505, DP_AUX_HDCP_BSTATUS);
> +               if (bstatus < 0)
> +                       return bstatus;
> +
> +               DRM_DEV_DEBUG_DRIVER(dev, "Bstatus = 0x%02x", bstatus);
> +       }
> +
> +       ret = drm_dp_dpcd_read_link_status(&it6505->aux, link_status);
> +       if (ret < 0) {
> +               DRM_DEV_ERROR(dev, "Fail to read link status ret: %d",
> +                             ret);
> +               return ret;
> +       }
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "link status = 0x%*ph",
> +                            (int)ARRAY_SIZE(link_status), link_status);
> +
> +       if (!drm_dp_channel_eq_ok(link_status, it6505->lane_count)) {
> +               it6505->auto_train_retry = AUTO_TRAIN_RETRY;
> +               it6505_video_reset(it6505);
> +       }
> +
> +       return 0;
> +}
> +
> +static void it6505_irq_hpd(struct it6505 *it6505)
> +{
> +       struct device *dev = &it6505->client->dev;
> +
> +       it6505->hpd_state = it6505_get_sink_hpd_status(it6505);
> +       DRM_DEV_DEBUG_DRIVER(dev, "hpd change interrupt, change to %s",
> +                            it6505->hpd_state ? "high" : "low");
> +
> +       if (it6505->bridge.dev)
> +               drm_helper_hpd_irq_event(it6505->bridge.dev);
> +       DRM_DEV_DEBUG_DRIVER(dev, "it6505->sink_count: %d",
> +                            it6505->sink_count);
> +
> +       if (it6505->hpd_state) {
> +               wait_for_completion_timeout(&it6505->wait_edid_complete,
> +                                           msecs_to_jiffies(6000));
> +               it6505_lane_termination_on(it6505);
> +               it6505_lane_power_on(it6505);
> +
> +               /*
> +                * for some dongle which issue HPD_irq
> +                * when sink count change from  0->1
> +                * it6505 not able to receive HPD_IRQ
> +                * if HW never go into trainig done
> +                */
> +
> +               if (it6505->branch_device && it6505->sink_count == 0)
> +                       schedule_work(&it6505->link_works);
> +
> +               if (!it6505_get_video_status(it6505))
> +                       it6505_video_reset(it6505);
> +
> +               it6505_calc_video_info(it6505);
> +       } else {
> +               kfree(it6505->edid);
> +               it6505->edid = NULL;
> +               memset(it6505->dpcd, 0, sizeof(it6505->dpcd));
> +
> +               if (it6505->hdcp_desired)
> +                       it6505_stop_hdcp(it6505);
> +
> +               it6505_video_disable(it6505);
> +               it6505_disable_audio(it6505);
> +               it6505_stop_link_train(it6505);
> +               it6505_lane_off(it6505);
> +               it6505_link_reset_step_train(it6505);
> +       }
> +}
> +
> +static void it6505_irq_hpd_irq(struct it6505 *it6505)
> +{
> +       struct device *dev = &it6505->client->dev;
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "hpd_irq interrupt");
> +
> +       if (it6505_process_hpd_irq(it6505) < 0)
> +               DRM_DEV_DEBUG_DRIVER(dev, "process hpd_irq fail!");
> +}
> +
> +static void it6505_irq_scdt(struct it6505 *it6505)
> +{
> +       struct device *dev = &it6505->client->dev;
> +       bool data;
> +
> +       data = it6505_get_video_status(it6505);
> +       DRM_DEV_DEBUG_DRIVER(dev, "video stable change interrupt, %s",
> +                            data ? "stable" : "unstable");
> +       it6505_calc_video_info(it6505);
> +       it6505_link_reset_step_train(it6505);
> +
> +       if (data)
> +               schedule_work(&it6505->link_works);
> +}
> +
> +static void it6505_irq_hdcp_done(struct it6505 *it6505)
> +{
> +       struct device *dev = &it6505->client->dev;
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "hdcp done interrupt");
> +       it6505->hdcp_status = HDCP_AUTH_DONE;
> +       it6505_show_hdcp_info(it6505);
> +}
> +
> +static void it6505_irq_hdcp_fail(struct it6505 *it6505)
> +{
> +       struct device *dev = &it6505->client->dev;
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "hdcp fail interrupt");
> +       it6505->hdcp_status = HDCP_AUTH_IDLE;
> +       it6505_show_hdcp_info(it6505);
> +       it6505_start_hdcp(it6505);
> +}
> +
> +static void it6505_irq_aux_cmd_fail(struct it6505 *it6505)
> +{
> +       struct device *dev = &it6505->client->dev;
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "AUX PC Request Fail Interrupt");
> +}
> +
> +static void it6505_irq_hdcp_ksv_check(struct it6505 *it6505)
> +{
> +       struct device *dev = &it6505->client->dev;
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "HDCP event Interrupt");
> +       schedule_work(&it6505->hdcp_wait_ksv_list);
> +}
> +
> +static void it6505_irq_audio_fifo_error(struct it6505 *it6505)
> +{
> +       struct device *dev = &it6505->client->dev;
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "audio fifo error Interrupt");
> +
> +       if (it6505_audio_input(it6505))
> +               it6505_enable_audio(it6505);
> +}
> +
> +static void it6505_irq_link_train_fail(struct it6505 *it6505)
> +{
> +       struct device *dev = &it6505->client->dev;
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "link training fail interrupt");
> +       schedule_work(&it6505->link_works);
> +}
> +
> +static void it6505_irq_video_fifo_error(struct it6505 *it6505)
> +{
> +       struct device *dev = &it6505->client->dev;
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "video fifo overflow interrupt");
> +       it6505->auto_train_retry = AUTO_TRAIN_RETRY;
> +       flush_work(&it6505->link_works);
> +       it6505_stop_hdcp(it6505);
> +       it6505_video_reset(it6505);
> +}
> +
> +static void it6505_irq_io_latch_fifo_overflow(struct it6505 *it6505)
> +{
> +       struct device *dev = &it6505->client->dev;
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "IO latch fifo overflow interrupt");
> +       it6505->auto_train_retry = AUTO_TRAIN_RETRY;
> +       flush_work(&it6505->link_works);
> +       it6505_stop_hdcp(it6505);
> +       it6505_video_reset(it6505);
> +}
> +
> +static bool it6505_test_bit(unsigned int bit, const unsigned int *addr)
> +{
> +       return 1 & (addr[bit / BITS_PER_BYTE] >> (bit % BITS_PER_BYTE));
> +}
> +
> +static irqreturn_t it6505_int_threaded_handler(int unused, void *data)
> +{
> +       struct it6505 *it6505 = data;
> +       struct device *dev = &it6505->client->dev;
> +       static const struct {
> +               int bit;
> +               void (*handler)(struct it6505 *it6505);
> +       } irq_vec[] = {
> +               { BIT_INT_HPD, it6505_irq_hpd },
> +               { BIT_INT_HPD_IRQ, it6505_irq_hpd_irq },
> +               { BIT_INT_SCDT, it6505_irq_scdt },
> +               { BIT_INT_HDCP_FAIL, it6505_irq_hdcp_fail },
> +               { BIT_INT_HDCP_DONE, it6505_irq_hdcp_done },
> +               { BIT_INT_AUX_CMD_FAIL, it6505_irq_aux_cmd_fail },
> +               { BIT_INT_HDCP_KSV_CHECK, it6505_irq_hdcp_ksv_check },
> +               { BIT_INT_AUDIO_FIFO_ERROR, it6505_irq_audio_fifo_error },
> +               { BIT_INT_LINK_TRAIN_FAIL, it6505_irq_link_train_fail },
> +               { BIT_INT_VID_FIFO_ERROR, it6505_irq_video_fifo_error },
> +               { BIT_INT_IO_FIFO_OVERFLOW, it6505_irq_io_latch_fifo_overflow },
> +       };
> +       int int_status[3], i;
> +
> +       msleep(100);
> +       mutex_lock(&it6505->extcon_lock);
> +
> +       if (it6505->enable_drv_hold || !it6505->powered)
> +               goto unlock;
> +
> +       int_status[0] = it6505_read(it6505, INT_STATUS_01);
> +       int_status[1] = it6505_read(it6505, INT_STATUS_02);
> +       int_status[2] = it6505_read(it6505, INT_STATUS_03);
> +
> +       it6505_write(it6505, INT_STATUS_01, int_status[0]);
> +       it6505_write(it6505, INT_STATUS_02, int_status[1]);
> +       it6505_write(it6505, INT_STATUS_03, int_status[2]);
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "reg06 = 0x%02x", int_status[0]);
> +       DRM_DEV_DEBUG_DRIVER(dev, "reg07 = 0x%02x", int_status[1]);
> +       DRM_DEV_DEBUG_DRIVER(dev, "reg08 = 0x%02x", int_status[2]);
> +       it6505_debug_print(it6505, REG_SYSTEM_STS, "");
> +
> +       if (it6505_test_bit(irq_vec[0].bit, (unsigned int *)int_status))
> +               irq_vec[0].handler(it6505);
> +
> +       if (!it6505->hpd_state)
> +               goto unlock;
> +
> +       for (i = 1; i < ARRAY_SIZE(irq_vec); i++) {
> +               if (it6505_test_bit(irq_vec[i].bit, (unsigned int *)int_status))
> +                       irq_vec[i].handler(it6505);
> +       }
> +
> +unlock:
> +       mutex_unlock(&it6505->extcon_lock);
> +
> +       return IRQ_HANDLED;
> +}
> +
> +static int it6505_poweron(struct it6505 *it6505)
> +{
> +       struct device *dev = &it6505->client->dev;
> +       struct it6505_platform_data *pdata = &it6505->pdata;
> +       int err;
> +
> +       if (it6505->powered) {
> +               DRM_DEV_DEBUG_DRIVER(dev, "it6505 already powered on");
> +               return 0;
> +       }
> +
> +       if (pdata->pwr18) {
> +               err = regulator_enable(pdata->pwr18);
> +               if (err) {
> +                       DRM_DEV_DEBUG_DRIVER(dev, "Failed to enable VDD18: %d",
> +                                            err);
> +                       return err;
> +               }
> +       }
> +
> +       if (pdata->ovdd) {
> +               /* time interval between IVDD and OVDD at least be 1ms */
> +               usleep_range(1000, 2000);
> +               err = regulator_enable(pdata->ovdd);
> +               if (err) {
> +                       regulator_disable(pdata->pwr18);
> +                       return err;
> +               }
> +       }
> +       /* time interval between OVDD and SYSRSTN at least be 10ms */
> +       if (pdata->gpiod_reset) {
> +               usleep_range(10000, 20000);
> +               gpiod_set_value_cansleep(pdata->gpiod_reset, 0);
> +               usleep_range(1000, 2000);
> +               gpiod_set_value_cansleep(pdata->gpiod_reset, 1);
> +               usleep_range(10000, 20000);
> +       }
> +
> +       it6505_reset_logic(it6505);
> +       it6505_int_mask_enable(it6505);
> +       it6505_init(it6505);
> +       it6505_lane_off(it6505);
> +
> +       it6505->powered = true;
> +
> +       return 0;
> +}
> +
> +static int it6505_poweroff(struct it6505 *it6505)
> +{
> +       struct device *dev = &it6505->client->dev;
> +       struct it6505_platform_data *pdata = &it6505->pdata;
> +       int err;
> +
> +       if (!it6505->powered) {
> +               DRM_DEV_DEBUG_DRIVER(dev, "power had been already off");
> +               return 0;
> +       }
> +
> +       if (pdata->gpiod_reset)
> +               gpiod_set_value_cansleep(pdata->gpiod_reset, 0);
> +
> +       if (pdata->pwr18) {
> +               err = regulator_disable(pdata->pwr18);
> +               if (err)
> +                       return err;
> +       }
> +
> +       if (pdata->ovdd) {
> +               err = regulator_disable(pdata->ovdd);
> +               if (err)
> +                       return err;
> +       }
> +
> +       it6505->powered = false;
> +       kfree(it6505->edid);
> +       it6505->edid = NULL;
> +       it6505->sink_count = 0;
> +
> +       return 0;
> +}
> +
> +static enum drm_connector_status it6505_detect(struct it6505 *it6505)
> +{
> +       struct device *dev = &it6505->client->dev;
> +       enum drm_connector_status status = connector_status_disconnected;
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "it6505->sink_count:%d powered:%d",
> +                            it6505->sink_count, it6505->powered);
> +
> +       mutex_lock(&it6505->mode_lock);
> +
> +       if (!it6505->powered)
> +               goto unlock;
> +
> +       if (it6505->enable_drv_hold) {
> +               status = it6505_get_sink_hpd_status(it6505) ?
> +                                       connector_status_connected :
> +                                       connector_status_disconnected;
> +               goto unlock;
> +       }
> +
> +       if (it6505_get_sink_hpd_status(it6505)) {
> +               it6505_aux_on(it6505);
> +               it6505_drm_dp_link_probe(&it6505->aux, &it6505->link);
> +               it6505_drm_dp_link_power_up(&it6505->aux, &it6505->link);
> +               it6505->auto_train_retry = AUTO_TRAIN_RETRY;
> +
> +               if (it6505->dpcd[0] == 0) {
> +                       it6505_get_dpcd(it6505, DP_DPCD_REV, it6505->dpcd,
> +                                       ARRAY_SIZE(it6505->dpcd));
> +                       it6505_variable_config(it6505);
> +                       it6505_parse_link_capabilities(it6505);
> +               }
> +
> +               it6505->sink_count = DP_GET_SINK_COUNT(it6505_dpcd_read(it6505,
> +                                                      DP_SINK_COUNT));
> +               DRM_DEV_DEBUG_DRIVER(dev, "it6505->sink_count:%d branch:%d",
> +                                    it6505->sink_count, it6505->branch_device);
> +
> +               if (it6505->branch_device) {
> +                       status = (it6505->sink_count != 0) ?
> +                                connector_status_connected :
> +                                connector_status_disconnected;
> +               } else {
> +                       status = connector_status_connected;
> +               }
> +       } else {
> +               it6505->sink_count = 0;
> +               memset(it6505->dpcd, 0, sizeof(it6505->dpcd));
> +       }
> +
> +unlock:
> +       if (it6505->connector_status != status) {
> +               it6505->connector_status = status;
> +               it6505_plugged_status_to_codec(it6505);
> +       }
> +
> +       mutex_unlock(&it6505->mode_lock);
> +
> +       return status;
> +}
> +
> +static int it6505_extcon_notifier(struct notifier_block *self,
> +                                 unsigned long event, void *ptr)
> +{
> +       struct it6505 *it6505 = container_of(self, struct it6505, event_nb);
> +
> +       schedule_work(&it6505->extcon_wq);
> +       return NOTIFY_DONE;
> +}
> +
> +static void it6505_extcon_work(struct work_struct *work)
> +{
> +       struct it6505 *it6505 = container_of(work, struct it6505, extcon_wq);
> +       struct device *dev = &it6505->client->dev;
> +       int state = extcon_get_state(it6505->extcon, EXTCON_DISP_DP);
> +       unsigned int pwroffretry = 0;
> +
> +       if (it6505->enable_drv_hold)
> +               return;
> +
> +       mutex_lock(&it6505->extcon_lock);
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "EXTCON_DISP_DP = 0x%02x", state);
> +       if (state > 0) {
> +               DRM_DEV_DEBUG_DRIVER(dev, "start to power on");
> +               msleep(100);
> +               it6505_poweron(it6505);
> +       } else {
> +               DRM_DEV_DEBUG_DRIVER(dev, "start to power off");
> +               while (it6505_poweroff(it6505) && pwroffretry++ < 5) {
> +                       DRM_DEV_DEBUG_DRIVER(dev, "power off fail %d times",
> +                                            pwroffretry);
> +               }
> +
> +               drm_helper_hpd_irq_event(it6505->bridge.dev);
> +               memset(it6505->dpcd, 0, sizeof(it6505->dpcd));
> +               DRM_DEV_DEBUG_DRIVER(dev, "power off it6505 success!");
> +       }
> +
> +       mutex_unlock(&it6505->extcon_lock);
> +}
> +
> +static int it6505_use_notifier_module(struct it6505 *it6505)
> +{
> +       int ret;
> +       struct device *dev = &it6505->client->dev;
> +
> +       it6505->event_nb.notifier_call = it6505_extcon_notifier;
> +       INIT_WORK(&it6505->extcon_wq, it6505_extcon_work);
> +       ret = devm_extcon_register_notifier(&it6505->client->dev,
> +                                           it6505->extcon, EXTCON_DISP_DP,
> +                                           &it6505->event_nb);
> +       if (ret) {
> +               DRM_DEV_ERROR(dev, "failed to register notifier for DP");
> +               return ret;
> +       }
> +
> +       schedule_work(&it6505->extcon_wq);
> +
> +       return 0;
> +}
> +
> +static void it6505_remove_notifier_module(struct it6505 *it6505)
> +{
> +       if (it6505->extcon) {
> +               devm_extcon_unregister_notifier(&it6505->client->dev,
> +                                               it6505->extcon, EXTCON_DISP_DP,
> +                                               &it6505->event_nb);
> +
> +               flush_work(&it6505->extcon_wq);
> +       }
> +}
> +
> +static void __maybe_unused it6505_delayed_audio(struct work_struct *work)
> +{
> +       struct it6505 *it6505 = container_of(work, struct it6505,
> +                                            delayed_audio.work);
> +
> +       DRM_DEV_DEBUG_DRIVER(&it6505->client->dev, "start");
> +
> +       if (!it6505->powered)
> +               return;
> +
> +       if (!it6505->enable_drv_hold)
> +               it6505_enable_audio(it6505);
> +}
> +
> +static int __maybe_unused it6505_audio_setup_hw_params(struct it6505 *it6505,
> +                                       struct hdmi_codec_params *params)
> +{
> +       struct device *dev = &it6505->client->dev;
> +       int i = 0;
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "%s %d Hz, %d bit, %d channels\n", __func__,
> +                            params->sample_rate, params->sample_width,
> +                            params->cea.channels);
> +
> +       if (!it6505->bridge.encoder)
> +               return -ENODEV;
> +
> +       if (params->cea.channels <= 1 || params->cea.channels > 8) {
> +               DRM_DEV_DEBUG_DRIVER(dev, "channel number: %d not support",
> +                                    it6505->audio.channel_count);
> +               return -EINVAL;
> +       }
> +
> +       it6505->audio.channel_count = params->cea.channels;
> +
> +       while (i < ARRAY_SIZE(audio_sample_rate_map) &&
> +              params->sample_rate !=
> +                      audio_sample_rate_map[i].sample_rate_value) {
> +               i++;
> +       }
> +       if (i == ARRAY_SIZE(audio_sample_rate_map)) {
> +               DRM_DEV_DEBUG_DRIVER(dev, "sample rate: %d Hz not support",
> +                                    params->sample_rate);
> +               return -EINVAL;
> +       }
> +       it6505->audio.sample_rate = audio_sample_rate_map[i].rate;
> +
> +       switch (params->sample_width) {
> +       case 16:
> +               it6505->audio.word_length = WORD_LENGTH_16BIT;
> +               break;
> +       case 18:
> +               it6505->audio.word_length = WORD_LENGTH_18BIT;
> +               break;
> +       case 20:
> +               it6505->audio.word_length = WORD_LENGTH_20BIT;
> +               break;
> +       case 24:
> +       case 32:
> +               it6505->audio.word_length = WORD_LENGTH_24BIT;
> +               break;
> +       default:
> +               DRM_DEV_DEBUG_DRIVER(dev, "wordlength: %d bit not support",
> +                                    params->sample_width);
> +               return -EINVAL;
> +       }
> +
> +       return 0;
> +}
> +
> +static void __maybe_unused it6505_audio_shutdown(struct device *dev, void *data)
> +{
> +       struct it6505 *it6505 = dev_get_drvdata(dev);
> +
> +       if (it6505->powered)
> +               it6505_disable_audio(it6505);
> +}
> +
> +static int __maybe_unused it6505_audio_hook_plugged_cb(struct device *dev,
> +                                                      void *data,
> +                                                      hdmi_codec_plugged_cb fn,
> +                                                      struct device *codec_dev)
> +{
> +       struct it6505 *it6505 = data;
> +
> +       it6505->plugged_cb = fn;
> +       it6505->codec_dev = codec_dev;
> +       it6505_plugged_status_to_codec(it6505);
> +
> +       return 0;
> +}
> +
> +static inline struct it6505 *bridge_to_it6505(struct drm_bridge *bridge)
> +{
> +       return container_of(bridge, struct it6505, bridge);
> +}
> +
> +static void it6505_bridge_mode_set(struct drm_bridge *bridge,
> +                                  const struct drm_display_mode *mode,
> +                                  const struct drm_display_mode *adjusted_mode)
> +{
> +       struct it6505 *it6505 = bridge_to_it6505(bridge);
> +
> +       if (WARN_ON(!it6505->powered))
> +               return;
> +
> +       mutex_lock(&it6505->mode_lock);
> +
> +       memcpy(&it6505->source_output_mode, adjusted_mode,
> +              sizeof(it6505->source_output_mode));
> +
> +       mutex_unlock(&it6505->mode_lock);
> +}
> +
> +static int it6505_bridge_attach(struct drm_bridge *bridge,
> +                               enum drm_bridge_attach_flags flags)
> +{
> +       struct it6505 *it6505 = bridge_to_it6505(bridge);
> +       struct device *dev = &it6505->client->dev;
> +       int ret;
> +
> +       if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
> +               DRM_ERROR("DRM_BRIDGE_ATTACH_NO_CONNECTOR must be supplied");
> +               return -EINVAL;
> +       }
> +
> +       if (!bridge->encoder) {
> +               DRM_DEV_ERROR(dev, "Parent encoder object not found");
> +               return -ENODEV;
> +       }
> +
> +       if (it6505->extcon) {
> +               ret = it6505_use_notifier_module(it6505);
> +               if (ret < 0) {
> +                       DRM_DEV_ERROR(dev, "use notifier module failed");
> +                       return ret;
> +               }
> +       }
> +
> +       return 0;
> +}
> +
> +static void it6505_bridge_detach(struct drm_bridge *bridge)
> +{
> +       struct it6505 *it6505 = bridge_to_it6505(bridge);
> +
> +       flush_work(&it6505->link_works);
> +       it6505_remove_notifier_module(it6505);
> +}
> +
> +static enum drm_mode_status
> +it6505_bridge_mode_valid(struct drm_bridge *bridge,
> +                        const struct drm_display_info *info,
> +                        const struct drm_display_mode *mode)
> +{
> +       struct it6505 *it6505 = bridge_to_it6505(bridge);
> +
> +       if (mode->flags & DRM_MODE_FLAG_INTERLACE)
> +               return MODE_NO_INTERLACE;
> +
> +       if (mode->clock > DPI_PIXEL_CLK_MAX)
> +               return MODE_CLOCK_HIGH;
> +
> +       it6505->video_info.clock = mode->clock;
> +
> +       return MODE_OK;
> +}
> +
> +static void it6505_bridge_atomic_enable(struct drm_bridge *bridge,
> +                                       struct drm_bridge_state *old_state)
> +{
> +       struct it6505 *it6505 = bridge_to_it6505(bridge);
> +       struct device *dev = &it6505->client->dev;
> +       struct drm_atomic_state *state = old_state->base.state;
> +       struct hdmi_avi_infoframe frame;
> +       struct drm_display_mode *adjusted_mode = &it6505->source_output_mode;
> +       struct drm_connector *connector;
> +       int ret;
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "%s : start", __func__);
> +
> +       connector = drm_atomic_get_new_connector_for_encoder(
> +               state, bridge->encoder);
> +
> +       ret = drm_hdmi_avi_infoframe_from_display_mode(&frame,
> +                                                      connector,
> +                                                      adjusted_mode);
> +       if (ret)
> +               DRM_DEV_ERROR(dev, "Failed to setup AVI infoframe: %d", ret);
> +
> +       it6505_update_video_parameter(it6505, adjusted_mode);
> +
> +       ret = it6505_send_video_infoframe(it6505, &frame);
> +
> +       if (ret)
> +               DRM_DEV_ERROR(dev, "Failed to send AVI infoframe: %d", ret);
> +
> +       it6505_int_mask_enable(it6505);
> +       it6505_video_reset(it6505);
> +}
> +
> +static void it6505_bridge_atomic_disable(struct drm_bridge *bridge,
> +                                        struct drm_bridge_state *old_state)
> +{
> +       struct it6505 *it6505 = bridge_to_it6505(bridge);
> +       struct device *dev = &it6505->client->dev;
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "%s : start", __func__);
> +
> +       if (it6505->powered)
> +               it6505_video_disable(it6505);
> +}
> +
> +static enum drm_connector_status
> +it6505_bridge_detect(struct drm_bridge *bridge)
> +{
> +       struct it6505 *it6505 = bridge_to_it6505(bridge);
> +
> +       return it6505_detect(it6505);
> +}
> +
> +static struct edid *it6505_bridge_get_edid(struct drm_bridge *bridge,
> +                                          struct drm_connector *connector)
> +{
> +       struct it6505 *it6505 = bridge_to_it6505(bridge);
> +       struct device *dev = &it6505->client->dev;
> +       struct edid *edid;
> +
> +       edid = drm_do_get_edid(connector, it6505_get_edid_block, it6505);
> +
> +       if (!edid) {
> +               DRM_DEV_DEBUG_DRIVER(dev, "failed to get edid!");
> +               return NULL;
> +       }
> +
> +       return edid;
> +}
> +
> +static const struct drm_bridge_funcs it6505_bridge_funcs = {
> +       .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
> +       .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
> +       .atomic_reset = drm_atomic_helper_bridge_reset,
> +       .attach = it6505_bridge_attach,
> +       .detach = it6505_bridge_detach,
> +       .mode_valid = it6505_bridge_mode_valid,
> +       .mode_set = it6505_bridge_mode_set,

mode_set() is deprecated, let it6505_bridge_atomic_enable() handle the
required functionality.

https://lore.kernel.org/linux-arm-kernel/20210722074200.3pdgt63vmex76oug@gilmour/T/#mc1e8753a6044889dbc0ee7a4c2d26bcfd69288cc

> +       .atomic_enable = it6505_bridge_atomic_enable,
> +       .atomic_disable = it6505_bridge_atomic_disable,
> +       .detect = it6505_bridge_detect,
> +       .get_edid = it6505_bridge_get_edid,
> +};
> +
> +#ifdef CONFIG_PM_SLEEP
> +
> +static int it6505_bridge_resume(struct device *dev)
> +{
> +       struct it6505 *it6505 = dev_get_drvdata(dev);
> +
> +       return it6505_poweron(it6505);
> +}
> +
> +static int it6505_bridge_suspend(struct device *dev)
> +{
> +       struct it6505 *it6505 = dev_get_drvdata(dev);
> +
> +       return it6505_poweroff(it6505);
> +}
> +
> +static SIMPLE_DEV_PM_OPS(it6505_bridge_pm_ops, it6505_bridge_suspend,
> +                        it6505_bridge_resume);
> +
> +#endif
> +
> +static int it6505_init_pdata(struct it6505 *it6505)
> +{
> +       struct it6505_platform_data *pdata = &it6505->pdata;
> +       struct device *dev = &it6505->client->dev;
> +
> +       /* 1.0V digital core power regulator  */
> +       pdata->pwr18 = devm_regulator_get(dev, "pwr18");
> +       if (IS_ERR(pdata->pwr18)) {
> +               DRM_DEV_ERROR(dev, "pwr18 regulator not found");
> +               return PTR_ERR(pdata->pwr18);
> +       }
> +
> +       pdata->ovdd = devm_regulator_get(dev, "ovdd");
> +       if (IS_ERR(pdata->ovdd)) {
> +               DRM_DEV_ERROR(dev, "ovdd regulator not found");
> +               return PTR_ERR(pdata->ovdd);
> +       }
> +
> +       pdata->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> +       if (IS_ERR(pdata->gpiod_reset)) {
> +               DRM_DEV_ERROR(dev, "gpiod_reset gpio not found");
> +               return PTR_ERR(pdata->gpiod_reset);
> +       }
> +
> +       return 0;
> +}
> +
> +static void it6505_parse_dt(struct it6505 *it6505)
> +{
> +       struct device *dev = &it6505->client->dev;
> +       u32 *afe_setting = &it6505->afe_setting;
> +
> +       it6505->lane_swap_disabled =
> +               device_property_read_bool(dev, "no-laneswap");
> +
> +       if (it6505->lane_swap_disabled)
> +               it6505->lane_swap = false;
> +
> +       if (device_property_read_u32(dev, "afe-setting", afe_setting) == 0) {
> +               if (*afe_setting >= ARRAY_SIZE(afe_setting_table)) {
> +                       DRM_DEV_ERROR(dev, "afe setting error, use default");
> +                       *afe_setting = 0;
> +               }
> +       } else {
> +               *afe_setting = 0;
> +       }
> +       DRM_DEV_DEBUG_DRIVER(dev, "using afe_setting: %d", *afe_setting);
> +}
> +
> +static ssize_t print_timing_show(struct device *dev,
> +                                struct device_attribute *attr, char *buf)
> +{
> +       struct it6505 *it6505 = dev_get_drvdata(dev);
> +       struct drm_display_mode *vid = &it6505->video_info;
> +       char *str = buf, *end = buf + PAGE_SIZE;
> +
> +       it6505_calc_video_info(it6505);
> +       str += scnprintf(str, end - str, "---video timing---\n");
> +       str += scnprintf(str, end - str, "PCLK:%d.%03dMHz\n",
> +                        vid->clock / 1000, vid->clock % 1000);
> +       str += scnprintf(str, end - str, "HTotal:%d\n", vid->htotal);
> +       str += scnprintf(str, end - str, "HActive:%d\n", vid->hdisplay);
> +       str += scnprintf(str, end - str, "HFrontPorch:%d\n",
> +                        vid->hsync_start - vid->hdisplay);
> +       str += scnprintf(str, end - str, "HSyncWidth:%d\n",
> +                        vid->hsync_end - vid->hsync_start);
> +       str += scnprintf(str, end - str, "HBackPorch:%d\n",
> +                        vid->htotal - vid->hsync_end);
> +       str += scnprintf(str, end - str, "VTotal:%d\n", vid->vtotal);
> +       str += scnprintf(str, end - str, "VActive:%d\n", vid->vdisplay);
> +       str += scnprintf(str, end - str, "VFrontPorch:%d\n",
> +                        vid->vsync_start - vid->vdisplay);
> +       str += scnprintf(str, end - str, "VSyncWidth:%d\n",
> +                        vid->vsync_end - vid->vsync_start);
> +       str += scnprintf(str, end - str, "VBackPorch:%d\n",
> +                        vid->vtotal - vid->vsync_end);
> +
> +       return str - buf;
> +}
> +
> +static ssize_t force_pwronoff_store(struct device *dev,
> +                                   struct device_attribute *attr,
> +                                   const char *buf, size_t count)
> +{
> +       struct it6505 *it6505 = dev_get_drvdata(dev);
> +       int pwr;
> +
> +       if (kstrtoint(buf, 10, &pwr) < 0)
> +               return -EINVAL;
> +
> +       if (pwr)
> +               it6505_poweron(it6505);
> +       else
> +               it6505_poweroff(it6505);
> +
> +       return count;
> +}
> +
> +static ssize_t enable_drv_hold_show(struct device *dev,
> +                                   struct device_attribute *attr, char *buf)
> +{
> +       struct it6505 *it6505 = dev_get_drvdata(dev);
> +
> +       return scnprintf(buf, PAGE_SIZE, "%d\n", it6505->enable_drv_hold);
> +}
> +
> +static ssize_t enable_drv_hold_store(struct device *dev,
> +                                    struct device_attribute *attr,
> +                                    const char *buf, size_t count)
> +{
> +       struct it6505 *it6505 = dev_get_drvdata(dev);
> +       unsigned int drv_hold;
> +
> +       if (kstrtoint(buf, 10, &drv_hold) < 0)
> +               return -EINVAL;
> +
> +       it6505->enable_drv_hold = drv_hold;
> +
> +       if (it6505->enable_drv_hold) {
> +               it6505_int_mask_disable(it6505);
> +       } else {
> +               it6505_clear_int(it6505);
> +               it6505_int_mask_enable(it6505);
> +
> +               if (it6505->powered) {
> +                       it6505->connector_status =
> +                                       it6505_get_sink_hpd_status(it6505) ?
> +                                       connector_status_connected :
> +                                       connector_status_disconnected;
> +               } else {
> +                       it6505->connector_status =
> +                                       connector_status_disconnected;
> +               }
> +       }
> +       return count;
> +}
> +
> +static DEVICE_ATTR_RO(print_timing);
> +static DEVICE_ATTR_WO(force_pwronoff);
> +static DEVICE_ATTR_RW(enable_drv_hold);
> +
> +static const struct attribute *it6505_attrs[] = {
> +       &dev_attr_print_timing.attr,
> +       &dev_attr_force_pwronoff.attr,
> +       &dev_attr_enable_drv_hold.attr,
> +       NULL,
> +};
> +
> +static void it6505_shutdown(struct i2c_client *client)
> +{
> +       struct it6505 *it6505 = dev_get_drvdata(&client->dev);
> +
> +       kfree(it6505->edid);
> +       it6505->edid = NULL;
> +
> +       if (it6505->powered)
> +               it6505_lane_off(it6505);
> +}
> +
> +static int it6505_i2c_probe(struct i2c_client *client,
> +                           const struct i2c_device_id *id)
> +{
> +       struct it6505 *it6505;
> +       struct device *dev = &client->dev;
> +       struct extcon_dev *extcon;
> +       int err, intp_irq;
> +
> +       it6505 = devm_kzalloc(&client->dev, sizeof(*it6505), GFP_KERNEL);
> +       if (!it6505)
> +               return -ENOMEM;
> +
> +       mutex_init(&it6505->extcon_lock);
> +       mutex_init(&it6505->mode_lock);
> +       mutex_init(&it6505->aux_lock);
> +
> +       it6505->bridge.of_node = client->dev.of_node;
> +       it6505->connector_status = connector_status_disconnected;
> +       it6505->client = client;
> +       i2c_set_clientdata(client, it6505);
> +
> +       /* get extcon device from DTS */
> +       extcon = extcon_get_edev_by_phandle(dev, 0);
> +       if (PTR_ERR(extcon) == -EPROBE_DEFER)
> +               return -EPROBE_DEFER;
> +       if (IS_ERR(extcon)) {
> +               DRM_DEV_ERROR(dev, "can not get extcon device!");
> +               return PTR_ERR(extcon);
> +       }
> +
> +       it6505->extcon = extcon;
> +
> +       it6505->regmap = devm_regmap_init_i2c(client, &it6505_regmap_config);
> +       if (IS_ERR(it6505->regmap)) {
> +               DRM_DEV_ERROR(dev, "regmap i2c init failed");
> +               err = PTR_ERR(it6505->regmap);
> +               return err;
> +       }
> +
> +       err = it6505_init_pdata(it6505);
> +       if (err) {
> +               DRM_DEV_ERROR(dev, "Failed to initialize pdata: %d", err);
> +               return err;
> +       }
> +
> +       it6505_parse_dt(it6505);
> +
> +       intp_irq = client->irq;
> +
> +       if (!intp_irq) {
> +               DRM_DEV_ERROR(dev, "Failed to get INTP IRQ");
> +               err = -ENODEV;
> +               return err;
> +       }
> +
> +       err = devm_request_threaded_irq(&client->dev, intp_irq, NULL,
> +                                       it6505_int_threaded_handler,
> +                                       IRQF_TRIGGER_LOW | IRQF_ONESHOT,
> +                                       "it6505-intp", it6505);
> +       if (err) {
> +               DRM_DEV_ERROR(dev, "Failed to request INTP threaded IRQ: %d",
> +                             err);
> +               return err;
> +       }
> +
> +       /* Register aux channel */
> +       it6505->aux.name = "DP-AUX";
> +       it6505->aux.dev = dev;
> +       it6505->aux.transfer = it6505_aux_transfer;
> +
> +       err = drm_dp_aux_register(&it6505->aux);
> +       if (err < 0) {
> +               DRM_DEV_ERROR(dev, "Failed to register aux: %d", err);
> +               return err;
> +       }
> +
> +       INIT_WORK(&it6505->link_works, it6505_link_training_work);
> +       INIT_WORK(&it6505->hdcp_wait_ksv_list, it6505_hdcp_wait_ksv_list);
> +       INIT_DELAYED_WORK(&it6505->hdcp_work, it6505_hdcp_work);
> +       init_completion(&it6505->wait_edid_complete);
> +       memset(it6505->dpcd, 0, sizeof(it6505->dpcd));
> +       it6505->powered = false;
> +       it6505->enable_drv_hold = DEFAULT_DRV_HOLD;
> +
> +       if (DEFAULT_PWR_ON)
> +               it6505_poweron(it6505);
> +
> +       err = sysfs_create_files(&client->dev.kobj, it6505_attrs);
> +       if (err) {
> +               drm_dp_aux_unregister(&it6505->aux);
> +               return err;
> +       }
> +
> +       it6505->bridge.funcs = &it6505_bridge_funcs;
> +       it6505->bridge.type = DRM_MODE_CONNECTOR_DisplayPort;
> +       it6505->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID |
> +                            DRM_BRIDGE_OP_HPD;
> +       drm_bridge_add(&it6505->bridge);
> +
> +       return 0;
> +}
> +
> +static int it6505_i2c_remove(struct i2c_client *client)
> +{
> +       struct it6505 *it6505 = i2c_get_clientdata(client);
> +
> +       drm_bridge_remove(&it6505->bridge);
> +       drm_dp_aux_unregister(&it6505->aux);
> +       sysfs_remove_files(&client->dev.kobj, it6505_attrs);
> +       it6505_poweroff(it6505);
> +
> +       return 0;
> +}
> +
> +static const struct i2c_device_id it6505_id[] = {
> +       { "it6505", 0 },
> +       { }
> +};
> +
> +MODULE_DEVICE_TABLE(i2c, it6505_id);
> +
> +static const struct of_device_id it6505_of_match[] = {
> +       { .compatible = "ite,it6505" },
> +       { }
> +};
> +
> +static struct i2c_driver it6505_i2c_driver = {
> +       .driver = {
> +               .name = "it6505",
> +               .of_match_table = it6505_of_match,
> +#ifdef CONFIG_PM_SLEEP
> +               .pm = &it6505_bridge_pm_ops,
> +#endif
> +       },
> +       .probe = it6505_i2c_probe,
> +       .remove = it6505_i2c_remove,
> +       .shutdown = it6505_shutdown,
> +       .id_table = it6505_id,
> +};
> +
> +module_i2c_driver(it6505_i2c_driver);
> +
> +MODULE_AUTHOR("Allen Chen <allen.chen@xxxxxxxxxx>");
> +MODULE_DESCRIPTION("IT6505 DisplayPort Transmitter driver");
> +MODULE_LICENSE("GPL v2");


> --
> 2.25.1
>




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