drivers/gpu/drm/bridge/ite-it6505.c

   1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
   2 /*
   3  * Copyright (c) 2020, The Linux Foundation. All rights reserved.
   4  */
   5 #include <linux/bits.h>
   6 #include <linux/delay.h>
   7 #include <linux/device.h>
   8 #include <linux/err.h>
   9 #include <linux/extcon.h>
  10 #include <linux/fs.h>
  11 #include <linux/gpio/consumer.h>
  12 #include <linux/i2c.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/pm_runtime.h>
  17 #include <linux/regmap.h>
  18 #include <linux/regulator/consumer.h>
  19 #include <linux/types.h>
  20 #include <linux/wait.h>
  21
  22 #include <crypto/hash.h>
  23
  24 #include <drm/display/drm_dp_helper.h>
  25 #include <drm/display/drm_hdcp_helper.h>
  26 #include <drm/drm_atomic_helper.h>
  27 #include <drm/drm_bridge.h>
  28 #include <drm/drm_crtc.h>
  29 #include <drm/drm_edid.h>
  30 #include <drm/drm_print.h>
  31 #include <drm/drm_probe_helper.h>
  32
  33 #include <sound/hdmi-codec.h>
  34
  35 #define REG_IC_VER 0x04
  36
  37 #define REG_RESET_CTRL 0x05
  38 #define VIDEO_RESET BIT(0)
  39 #define AUDIO_RESET BIT(1)
  40 #define ALL_LOGIC_RESET BIT(2)
  41 #define AUX_RESET BIT(3)
  42 #define HDCP_RESET BIT(4)
  43
  44 #define INT_STATUS_01 0x06
  45 #define INT_MASK_01 0x09
  46 #define INT_HPD_CHANGE 0
  47 #define INT_RECEIVE_HPD_IRQ 1
  48 #define INT_SCDT_CHANGE 2
  49 #define INT_HDCP_FAIL 3
  50 #define INT_HDCP_DONE 4
  51 #define BIT_OFFSET(x) (((x) - INT_STATUS_01) * BITS_PER_BYTE)
  52 #define BIT_INT_HPD INT_HPD_CHANGE
  53 #define BIT_INT_HPD_IRQ INT_RECEIVE_HPD_IRQ
  54 #define BIT_INT_SCDT INT_SCDT_CHANGE
  55 #define BIT_INT_HDCP_FAIL INT_HDCP_FAIL
  56 #define BIT_INT_HDCP_DONE INT_HDCP_DONE
  57
  58 #define INT_STATUS_02 0x07
  59 #define INT_MASK_02 0x0A
  60 #define INT_AUX_CMD_FAIL 0
  61 #define INT_HDCP_KSV_CHECK 1
  62 #define INT_AUDIO_FIFO_ERROR 2
  63 #define BIT_INT_AUX_CMD_FAIL (BIT_OFFSET(0x07) + INT_AUX_CMD_FAIL)
  64 #define BIT_INT_HDCP_KSV_CHECK (BIT_OFFSET(0x07) + INT_HDCP_KSV_CHECK)
  65 #define BIT_INT_AUDIO_FIFO_ERROR (BIT_OFFSET(0x07) + INT_AUDIO_FIFO_ERROR)
  66
  67 #define INT_STATUS_03 0x08
  68 #define INT_MASK_03 0x0B
  69 #define INT_LINK_TRAIN_FAIL 4
  70 #define INT_VID_FIFO_ERROR 5
  71 #define INT_IO_LATCH_FIFO_OVERFLOW 7
  72 #define BIT_INT_LINK_TRAIN_FAIL (BIT_OFFSET(0x08) + INT_LINK_TRAIN_FAIL)
  73 #define BIT_INT_VID_FIFO_ERROR (BIT_OFFSET(0x08) + INT_VID_FIFO_ERROR)
  74 #define BIT_INT_IO_FIFO_OVERFLOW (BIT_OFFSET(0x08) + INT_IO_LATCH_FIFO_OVERFLOW)
  75
  76 #define REG_SYSTEM_STS 0x0D
  77 #define INT_STS BIT(0)
  78 #define HPD_STS BIT(1)
  79 #define VIDEO_STB BIT(2)
  80
  81 #define REG_LINK_TRAIN_STS 0x0E
  82 #define LINK_STATE_CR BIT(2)
  83 #define LINK_STATE_EQ BIT(3)
  84 #define LINK_STATE_NORP BIT(4)
  85
  86 #define REG_BANK_SEL 0x0F
  87 #define REG_CLK_CTRL0 0x10
  88 #define M_PCLK_DELAY 0x03
  89
  90 #define REG_AUX_OPT 0x11
  91 #define AUX_AUTO_RST BIT(0)
  92 #define AUX_FIX_FREQ BIT(3)
  93
  94 #define REG_DATA_CTRL0 0x12
  95 #define VIDEO_LATCH_EDGE BIT(4)
  96 #define ENABLE_PCLK_COUNTER BIT(7)
  97
  98 #define REG_PCLK_COUNTER_VALUE 0x13
  99
 100 #define REG_501_FIFO_CTRL 0x15
 101 #define RST_501_FIFO BIT(1)
 102
 103 #define REG_TRAIN_CTRL0 0x16
 104 #define FORCE_LBR BIT(0)
 105 #define LANE_COUNT_MASK 0x06
 106 #define LANE_SWAP BIT(3)
 107 #define SPREAD_AMP_5 BIT(4)
 108 #define FORCE_CR_DONE BIT(5)
 109 #define FORCE_EQ_DONE BIT(6)
 110
 111 #define REG_TRAIN_CTRL1 0x17
 112 #define AUTO_TRAIN BIT(0)
 113 #define MANUAL_TRAIN BIT(1)
 114 #define FORCE_RETRAIN BIT(2)
 115
 116 #define REG_AUX_CTRL 0x23
 117 #define CLR_EDID_FIFO BIT(0)
 118 #define AUX_USER_MODE BIT(1)
 119 #define AUX_NO_SEGMENT_WR BIT(6)
 120 #define AUX_EN_FIFO_READ BIT(7)
 121
 122 #define REG_AUX_ADR_0_7 0x24
 123 #define REG_AUX_ADR_8_15 0x25
 124 #define REG_AUX_ADR_16_19 0x26
 125 #define REG_AUX_OUT_DATA0 0x27
 126
 127 #define REG_AUX_CMD_REQ 0x2B
 128 #define AUX_BUSY BIT(5)
 129
 130 #define REG_AUX_DATA_0_7 0x2C
 131 #define REG_AUX_DATA_8_15 0x2D
 132 #define REG_AUX_DATA_16_23 0x2E
 133 #define REG_AUX_DATA_24_31 0x2F
 134
 135 #define REG_AUX_DATA_FIFO 0x2F
 136
 137 #define REG_AUX_ERROR_STS 0x9F
 138 #define M_AUX_REQ_FAIL 0x03
 139
 140 #define REG_HDCP_CTRL1 0x38
 141 #define HDCP_CP_ENABLE BIT(0)
 142
 143 #define REG_HDCP_TRIGGER 0x39
 144 #define HDCP_TRIGGER_START  BIT(0)
 145 #define HDCP_TRIGGER_CPIRQ  BIT(1)
 146 #define HDCP_TRIGGER_KSV_DONE  BIT(4)
 147 #define HDCP_TRIGGER_KSV_FAIL BIT(5)
 148
 149 #define REG_HDCP_CTRL2 0x3A
 150 #define HDCP_AN_SEL BIT(0)
 151 #define HDCP_AN_GEN BIT(1)
 152 #define HDCP_HW_HPDIRQ_ACT BIT(2)
 153 #define HDCP_EN_M0_READ BIT(5)
 154
 155 #define REG_M0_0_7 0x4C
 156 #define REG_AN_0_7 0x4C
 157 #define REG_SP_CTRL0 0x58
 158 #define REG_IP_CTRL1 0x59
 159 #define REG_IP_CTRL2 0x5A
 160
 161 #define REG_LINK_DRV 0x5C
 162 #define DRV_HS BIT(1)
 163
 164 #define REG_DRV_LN_DATA_SEL 0x5D
 165
 166 #define REG_AUX 0x5E
 167
 168 #define REG_VID_BUS_CTRL0 0x60
 169 #define IN_DDR BIT(2)
 170 #define DDR_CD (0x01 << 6)
 171
 172 #define REG_VID_BUS_CTRL1 0x61
 173 #define TX_FIFO_RESET BIT(1)
 174
 175 #define REG_INPUT_CTRL 0xA0
 176 #define INPUT_HSYNC_POL BIT(0)
 177 #define INPUT_VSYNC_POL BIT(2)
 178 #define INPUT_INTERLACED BIT(4)
 179
 180 #define REG_INPUT_HTOTAL 0xA1
 181 #define REG_INPUT_HACTIVE_START 0xA3
 182 #define REG_INPUT_HACTIVE_WIDTH 0xA5
 183 #define REG_INPUT_HFRONT_PORCH 0xA7
 184 #define REG_INPUT_HSYNC_WIDTH 0xA9
 185 #define REG_INPUT_VTOTAL 0xAB
 186 #define REG_INPUT_VACTIVE_START 0xAD
 187 #define REG_INPUT_VACTIVE_WIDTH 0xAF
 188 #define REG_INPUT_VFRONT_PORCH 0xB1
 189 #define REG_INPUT_VSYNC_WIDTH 0xB3
 190
 191 #define REG_AUDIO_SRC_CTRL 0xB8
 192 #define M_AUDIO_I2S_EN 0x0F
 193 #define EN_I2S0 BIT(0)
 194 #define EN_I2S1 BIT(1)
 195 #define EN_I2S2 BIT(2)
 196 #define EN_I2S3 BIT(3)
 197 #define AUDIO_FIFO_RESET BIT(7)
 198
 199 #define REG_AUDIO_FMT 0xB9
 200 #define REG_AUDIO_FIFO_SEL 0xBA
 201
 202 #define REG_AUDIO_CTRL0 0xBB
 203 #define AUDIO_FULL_PKT BIT(4)
 204 #define AUDIO_16B_BOUND BIT(5)
 205
 206 #define REG_AUDIO_CTRL1 0xBC
 207 #define REG_AUDIO_INPUT_FREQ 0xBE
 208
 209 #define REG_IEC958_STS0 0xBF
 210 #define REG_IEC958_STS1 0xC0
 211 #define REG_IEC958_STS2 0xC1
 212 #define REG_IEC958_STS3 0xC2
 213 #define REG_IEC958_STS4 0xC3
 214
 215 #define REG_HPD_IRQ_TIME 0xC9
 216 #define REG_AUX_DEBUG_MODE 0xCA
 217 #define REG_AUX_OPT2 0xCB
 218 #define REG_HDCP_OPT 0xCE
 219 #define REG_USER_DRV_PRE 0xCF
 220
 221 #define REG_DATA_MUTE_CTRL 0xD3
 222 #define ENABLE_ENHANCED_FRAME BIT(0)
 223 #define ENABLE_AUTO_VIDEO_FIFO_RESET BIT(1)
 224 #define EN_VID_MUTE BIT(4)
 225 #define EN_AUD_MUTE BIT(5)
 226
 227 #define REG_TIME_STMP_CTRL 0xD4
 228 #define EN_ENHANCE_VID_STMP BIT(0)
 229 #define EN_ENHANCE_AUD_STMP BIT(2)
 230 #define M_STAMP_STEP 0x30
 231 #define EN_SSC_GAT BIT(6)
 232
 233 #define REG_INFOFRAME_CTRL 0xE8
 234 #define EN_AVI_PKT BIT(0)
 235 #define EN_AUD_PKT BIT(1)
 236 #define EN_MPG_PKT BIT(2)
 237 #define EN_GEN_PKT BIT(3)
 238 #define EN_VID_TIME_STMP BIT(4)
 239 #define EN_AUD_TIME_STMP BIT(5)
 240 #define EN_VID_CTRL_PKT (EN_AVI_PKT | EN_VID_TIME_STMP)
 241 #define EN_AUD_CTRL_PKT (EN_AUD_PKT | EN_AUD_TIME_STMP)
 242
 243 #define REG_AUDIO_N_0_7 0xDE
 244 #define REG_AUDIO_N_8_15 0xDF
 245 #define REG_AUDIO_N_16_23 0xE0
 246
 247 #define REG_AVI_INFO_DB1 0xE9
 248 #define REG_AVI_INFO_DB2 0xEA
 249 #define REG_AVI_INFO_DB3 0xEB
 250 #define REG_AVI_INFO_DB4 0xEC
 251 #define REG_AVI_INFO_DB5 0xED
 252 #define REG_AVI_INFO_SUM 0xF6
 253
 254 #define REG_AUD_INFOFRAM_DB1 0xF7
 255 #define REG_AUD_INFOFRAM_DB2 0xF8
 256 #define REG_AUD_INFOFRAM_DB3 0xF9
 257 #define REG_AUD_INFOFRAM_DB4 0xFA
 258 #define REG_AUD_INFOFRAM_SUM 0xFB
 259
 260 /* the following six registers are in bank1 */
 261 #define REG_DRV_0_DB_800_MV 0x17E
 262 #define REG_PRE_0_DB_800_MV 0x17F
 263 #define REG_PRE_3P5_DB_800_MV 0x181
 264 #define REG_SSC_CTRL0 0x188
 265 #define REG_SSC_CTRL1 0x189
 266 #define REG_SSC_CTRL2 0x18A
 267
 268 #define RBR DP_LINK_BW_1_62
 269 #define HBR DP_LINK_BW_2_7
 270 #define HBR2 DP_LINK_BW_5_4
 271 #define HBR3 DP_LINK_BW_8_1
 272
 273 #define DPCD_V_1_1 0x11
 274 #define MISC_VERB 0xF0
 275 #define MISC_VERC 0x70
 276 #define I2S_INPUT_FORMAT_STANDARD 0
 277 #define I2S_INPUT_FORMAT_32BIT 1
 278 #define I2S_INPUT_LEFT_JUSTIFIED 0
 279 #define I2S_INPUT_RIGHT_JUSTIFIED 1
 280 #define I2S_DATA_1T_DELAY 0
 281 #define I2S_DATA_NO_DELAY 1
 282 #define I2S_WS_LEFT_CHANNEL 0
 283 #define I2S_WS_RIGHT_CHANNEL 1
 284 #define I2S_DATA_MSB_FIRST 0
 285 #define I2S_DATA_LSB_FIRST 1
 286 #define WORD_LENGTH_16BIT 0
 287 #define WORD_LENGTH_18BIT 1
 288 #define WORD_LENGTH_20BIT 2
 289 #define WORD_LENGTH_24BIT 3
 290 #define DEBUGFS_DIR_NAME "it6505-debugfs"
 291 #define READ_BUFFER_SIZE 400
 292
 293 /* Vendor option */
 294 #define HDCP_DESIRED 1
 295 #define MAX_LANE_COUNT 4
 296 #define MAX_LINK_RATE HBR
 297 #define AUTO_TRAIN_RETRY 3
 298 #define MAX_HDCP_DOWN_STREAM_COUNT 10
 299 #define MAX_CR_LEVEL 0x03
 300 #define MAX_EQ_LEVEL 0x03
 301 #define AUX_WAIT_TIMEOUT_MS 15
 302 #define AUX_FIFO_MAX_SIZE 32
 303 #define PIXEL_CLK_DELAY 1
 304 #define PIXEL_CLK_INVERSE 0
 305 #define ADJUST_PHASE_THRESHOLD 80000
 306 #define DPI_PIXEL_CLK_MAX 95000
 307 #define HDCP_SHA1_FIFO_LEN (MAX_HDCP_DOWN_STREAM_COUNT * 5 + 10)
 308 #define DEFAULT_PWR_ON 0
 309 #define DEFAULT_DRV_HOLD 0
 310
 311 #define AUDIO_SELECT I2S
 312 #define AUDIO_TYPE LPCM
 313 #define AUDIO_SAMPLE_RATE SAMPLE_RATE_48K
 314 #define AUDIO_CHANNEL_COUNT 2
 315 #define I2S_INPUT_FORMAT I2S_INPUT_FORMAT_32BIT
 316 #define I2S_JUSTIFIED I2S_INPUT_LEFT_JUSTIFIED
 317 #define I2S_DATA_DELAY I2S_DATA_1T_DELAY
 318 #define I2S_WS_CHANNEL I2S_WS_LEFT_CHANNEL
 319 #define I2S_DATA_SEQUENCE I2S_DATA_MSB_FIRST
 320 #define AUDIO_WORD_LENGTH WORD_LENGTH_24BIT
 321
 322 enum aux_cmd_type {
 323         CMD_AUX_NATIVE_READ = 0x0,
 324         CMD_AUX_NATIVE_WRITE = 0x5,
 325         CMD_AUX_I2C_EDID_READ = 0xB,
 326 };
 327
 328 enum aux_cmd_reply {
 329         REPLY_ACK,
 330         REPLY_NACK,
 331         REPLY_DEFER,
 332 };
 333
 334 enum link_train_status {
 335         LINK_IDLE,
 336         LINK_BUSY,
 337         LINK_OK,
 338 };
 339
 340 enum hdcp_state {
 341         HDCP_AUTH_IDLE,
 342         HDCP_AUTH_GOING,
 343         HDCP_AUTH_DONE,
 344 };
 345
 346 struct it6505_platform_data {
 347         struct regulator *pwr18;
 348         struct regulator *ovdd;
 349         struct gpio_desc *gpiod_reset;
 350 };
 351
 352 enum it6505_audio_select {
 353         I2S = 0,
 354         SPDIF,
 355 };
 356
 357 enum it6505_audio_sample_rate {
 358         SAMPLE_RATE_24K = 0x6,
 359         SAMPLE_RATE_32K = 0x3,
 360         SAMPLE_RATE_48K = 0x2,
 361         SAMPLE_RATE_96K = 0xA,
 362         SAMPLE_RATE_192K = 0xE,
 363         SAMPLE_RATE_44_1K = 0x0,
 364         SAMPLE_RATE_88_2K = 0x8,
 365         SAMPLE_RATE_176_4K = 0xC,
 366 };
 367
 368 enum it6505_audio_type {
 369         LPCM = 0,
 370         NLPCM,
 371         DSS,
 372 };
 373
 374 struct it6505_audio_data {
 375         enum it6505_audio_select select;
 376         enum it6505_audio_sample_rate sample_rate;
 377         enum it6505_audio_type type;
 378         u8 word_length;
 379         u8 channel_count;
 380         u8 i2s_input_format;
 381         u8 i2s_justified;
 382         u8 i2s_data_delay;
 383         u8 i2s_ws_channel;
 384         u8 i2s_data_sequence;
 385 };
 386
 387 struct it6505_audio_sample_rate_map {
 388         enum it6505_audio_sample_rate rate;
 389         int sample_rate_value;
 390 };
 391
 392 struct it6505_drm_dp_link {
 393         unsigned char revision;
 394         unsigned int rate;
 395         unsigned int num_lanes;
 396         unsigned long capabilities;
 397 };
 398
 399 struct debugfs_entries {
 400         char *name;
 401         const struct file_operations *fops;
 402 };
 403
 404 struct it6505 {
 405         struct drm_dp_aux aux;
 406         struct drm_bridge bridge;
 407         struct device *dev;
 408         struct it6505_drm_dp_link link;
 409         struct it6505_platform_data pdata;
 410         /*
 411          * Mutex protects extcon and interrupt functions from interfering
 412          * each other.
 413          */
 414         struct mutex extcon_lock;
 415         struct mutex mode_lock; /* used to bridge_detect */
 416         struct mutex aux_lock; /* used to aux data transfers */
 417         struct regmap *regmap;
 418         struct drm_display_mode source_output_mode;
 419         struct drm_display_mode video_info;
 420         struct notifier_block event_nb;
 421         struct extcon_dev *extcon;
 422         struct work_struct extcon_wq;
 423         int extcon_state;
 424         enum drm_connector_status connector_status;
 425         enum link_train_status link_state;
 426         struct work_struct link_works;
 427         u8 dpcd[DP_RECEIVER_CAP_SIZE];
 428         u8 lane_count;
 429         u8 link_rate_bw_code;
 430         u8 sink_count;
 431         bool step_train;
 432         bool branch_device;
 433         bool enable_ssc;
 434         bool lane_swap_disabled;
 435         bool lane_swap;
 436         bool powered;
 437         bool hpd_state;
 438         u32 afe_setting;
 439         u32 max_dpi_pixel_clock;
 440         u32 max_lane_count;
 441         enum hdcp_state hdcp_status;
 442         struct delayed_work hdcp_work;
 443         struct work_struct hdcp_wait_ksv_list;
 444         struct completion extcon_completion;
 445         u8 auto_train_retry;
 446         bool hdcp_desired;
 447         bool is_repeater;
 448         u8 hdcp_down_stream_count;
 449         u8 bksvs[DRM_HDCP_KSV_LEN];
 450         u8 sha1_input[HDCP_SHA1_FIFO_LEN];
 451         bool enable_enhanced_frame;
 452         hdmi_codec_plugged_cb plugged_cb;
 453         struct device *codec_dev;
 454         struct delayed_work delayed_audio;
 455         struct it6505_audio_data audio;
 456         struct dentry *debugfs;
 457
 458         /* it6505 driver hold option */
 459         bool enable_drv_hold;
 460
 461         struct edid *cached_edid;
 462 };
 463
 464 struct it6505_step_train_para {
 465         u8 voltage_swing[MAX_LANE_COUNT];
 466         u8 pre_emphasis[MAX_LANE_COUNT];
 467 };
 468
 469 /*
 470  * Vendor option afe settings for different platforms
 471  * 0: without FPC cable
 472  * 1: with FPC cable
 473  */
 474
 475 static const u8 afe_setting_table[][3] = {
 476         {0x82, 0x00, 0x45},
 477         {0x93, 0x2A, 0x85}
 478 };
 479
 480 static const struct it6505_audio_sample_rate_map audio_sample_rate_map[] = {
 481         {SAMPLE_RATE_24K, 24000},
 482         {SAMPLE_RATE_32K, 32000},
 483         {SAMPLE_RATE_48K, 48000},
 484         {SAMPLE_RATE_96K, 96000},
 485         {SAMPLE_RATE_192K, 192000},
 486         {SAMPLE_RATE_44_1K, 44100},
 487         {SAMPLE_RATE_88_2K, 88200},
 488         {SAMPLE_RATE_176_4K, 176400},
 489 };
 490
 491 static const struct regmap_range it6505_bridge_volatile_ranges[] = {
 492         { .range_min = 0, .range_max = 0x1FF },
 493 };
 494
 495 static const struct regmap_access_table it6505_bridge_volatile_table = {
 496         .yes_ranges = it6505_bridge_volatile_ranges,
 497         .n_yes_ranges = ARRAY_SIZE(it6505_bridge_volatile_ranges),
 498 };
 499
 500 static const struct regmap_range_cfg it6505_regmap_banks[] = {
 501         {
 502                 .name = "it6505",
 503                 .range_min = 0x00,
 504                 .range_max = 0x1FF,
 505                 .selector_reg = REG_BANK_SEL,
 506                 .selector_mask = 0x1,
 507                 .selector_shift = 0,
 508                 .window_start = 0x00,
 509                 .window_len = 0x100,
 510         },
 511 };
 512
 513 static const struct regmap_config it6505_regmap_config = {
 514         .reg_bits = 8,
 515         .val_bits = 8,
 516         .volatile_table = &it6505_bridge_volatile_table,
 517         .cache_type = REGCACHE_NONE,
 518         .ranges = it6505_regmap_banks,
 519         .num_ranges = ARRAY_SIZE(it6505_regmap_banks),
 520         .max_register = 0x1FF,
 521 };
 522
 523 static int it6505_read(struct it6505 *it6505, unsigned int reg_addr)
 524 {
 525         unsigned int value;
 526         int err;
 527         struct device *dev = it6505->dev;
 528
 529         if (!it6505->powered)
 530                 return -ENODEV;
 531
 532         err = regmap_read(it6505->regmap, reg_addr, &value);
 533         if (err < 0) {
 534                 dev_err(dev, "read failed reg[0x%x] err: %d", reg_addr, err);
 535                 return err;
 536         }
 537
 538         return value;
 539 }
 540
 541 static int it6505_write(struct it6505 *it6505, unsigned int reg_addr,
 542                         unsigned int reg_val)
 543 {
 544         int err;
 545         struct device *dev = it6505->dev;
 546
 547         if (!it6505->powered)
 548                 return -ENODEV;
 549
 550         err = regmap_write(it6505->regmap, reg_addr, reg_val);
 551
 552         if (err < 0) {
 553                 dev_err(dev, "write failed reg[0x%x] = 0x%x err = %d",
 554                         reg_addr, reg_val, err);
 555                 return err;
 556         }
 557
 558         return 0;
 559 }
 560
 561 static int it6505_set_bits(struct it6505 *it6505, unsigned int reg,
 562                            unsigned int mask, unsigned int value)
 563 {
 564         int err;
 565         struct device *dev = it6505->dev;
 566
 567         if (!it6505->powered)
 568                 return -ENODEV;
 569
 570         err = regmap_update_bits(it6505->regmap, reg, mask, value);
 571         if (err < 0) {
 572                 dev_err(dev, "write reg[0x%x] = 0x%x mask = 0x%x failed err %d",
 573                         reg, value, mask, err);
 574                 return err;
 575         }
 576
 577         return 0;
 578 }
 579
 580 static void it6505_debug_print(struct it6505 *it6505, unsigned int reg,
 581                                const char *prefix)
 582 {
 583         struct device *dev = it6505->dev;
 584         int val;
 585
 586         if (!drm_debug_enabled(DRM_UT_DRIVER))
 587                 return;
 588
 589         val = it6505_read(it6505, reg);
 590         if (val < 0)
 591                 DRM_DEV_DEBUG_DRIVER(dev, "%s reg[%02x] read error (%d)",
 592                                      prefix, reg, val);
 593         else
 594                 DRM_DEV_DEBUG_DRIVER(dev, "%s reg[%02x] = 0x%02x", prefix, reg,
 595                                      val);
 596 }
 597
 598 static int it6505_dpcd_read(struct it6505 *it6505, unsigned long offset)
 599 {
 600         u8 value;
 601         int ret;
 602         struct device *dev = it6505->dev;
 603
 604         ret = drm_dp_dpcd_readb(&it6505->aux, offset, &value);
 605         if (ret < 0) {
 606                 dev_err(dev, "DPCD read failed [0x%lx] ret: %d", offset, ret);
 607                 return ret;
 608         }
 609         return value;
 610 }
 611
 612 static int it6505_dpcd_write(struct it6505 *it6505, unsigned long offset,
 613                              u8 datain)
 614 {
 615         int ret;
 616         struct device *dev = it6505->dev;
 617
 618         ret = drm_dp_dpcd_writeb(&it6505->aux, offset, datain);
 619         if (ret < 0) {
 620                 dev_err(dev, "DPCD write failed [0x%lx] ret: %d", offset, ret);
 621                 return ret;
 622         }
 623         return 0;
 624 }
 625
 626 static int it6505_get_dpcd(struct it6505 *it6505, int offset, u8 *dpcd, int num)
 627 {
 628         int ret;
 629         struct device *dev = it6505->dev;
 630
 631         ret = drm_dp_dpcd_read(&it6505->aux, offset, dpcd, num);
 632
 633         if (ret < 0)
 634                 return ret;
 635
 636         DRM_DEV_DEBUG_DRIVER(dev, "ret = %d DPCD[0x%x] = 0x%*ph", ret, offset,
 637                              num, dpcd);
 638
 639         return 0;
 640 }
 641
 642 static void it6505_dump(struct it6505 *it6505)
 643 {
 644         unsigned int i, j;
 645         u8 regs[16];
 646         struct device *dev = it6505->dev;
 647
 648         for (i = 0; i <= 0xff; i += 16) {
 649                 for (j = 0; j < 16; j++)
 650                         regs[j] = it6505_read(it6505, i + j);
 651
 652                 DRM_DEV_DEBUG_DRIVER(dev, "[0x%02x] = %16ph", i, regs);
 653         }
 654 }
 655
 656 static bool it6505_get_sink_hpd_status(struct it6505 *it6505)
 657 {
 658         int reg_0d;
 659
 660         reg_0d = it6505_read(it6505, REG_SYSTEM_STS);
 661
 662         if (reg_0d < 0)
 663                 return false;
 664
 665         return reg_0d & HPD_STS;
 666 }
 667
 668 static int it6505_read_word(struct it6505 *it6505, unsigned int reg)
 669 {
 670         int val0, val1;
 671
 672         val0 = it6505_read(it6505, reg);
 673         if (val0 < 0)
 674                 return val0;
 675
 676         val1 = it6505_read(it6505, reg + 1);
 677         if (val1 < 0)
 678                 return val1;
 679
 680         return (val1 << 8) | val0;
 681 }
 682
 683 static void it6505_calc_video_info(struct it6505 *it6505)
 684 {
 685         struct device *dev = it6505->dev;
 686         int hsync_pol, vsync_pol, interlaced;
 687         int htotal, hdes, hdew, hfph, hsyncw;
 688         int vtotal, vdes, vdew, vfph, vsyncw;
 689         int rddata, i, pclk, sum = 0;
 690
 691         usleep_range(10000, 15000);
 692         rddata = it6505_read(it6505, REG_INPUT_CTRL);
 693         hsync_pol = rddata & INPUT_HSYNC_POL;
 694         vsync_pol = (rddata & INPUT_VSYNC_POL) >> 2;
 695         interlaced = (rddata & INPUT_INTERLACED) >> 4;
 696
 697         htotal = it6505_read_word(it6505, REG_INPUT_HTOTAL) & 0x1FFF;
 698         hdes = it6505_read_word(it6505, REG_INPUT_HACTIVE_START) & 0x1FFF;
 699         hdew = it6505_read_word(it6505, REG_INPUT_HACTIVE_WIDTH) & 0x1FFF;
 700         hfph = it6505_read_word(it6505, REG_INPUT_HFRONT_PORCH) & 0x1FFF;
 701         hsyncw = it6505_read_word(it6505, REG_INPUT_HSYNC_WIDTH) & 0x1FFF;
 702
 703         vtotal = it6505_read_word(it6505, REG_INPUT_VTOTAL) & 0xFFF;
 704         vdes = it6505_read_word(it6505, REG_INPUT_VACTIVE_START) & 0xFFF;
 705         vdew = it6505_read_word(it6505, REG_INPUT_VACTIVE_WIDTH) & 0xFFF;
 706         vfph = it6505_read_word(it6505, REG_INPUT_VFRONT_PORCH) & 0xFFF;
 707         vsyncw = it6505_read_word(it6505, REG_INPUT_VSYNC_WIDTH) & 0xFFF;
 708
 709         DRM_DEV_DEBUG_DRIVER(dev, "hsync_pol:%d, vsync_pol:%d, interlaced:%d",
 710                              hsync_pol, vsync_pol, interlaced);
 711         DRM_DEV_DEBUG_DRIVER(dev, "hactive_start:%d, vactive_start:%d",
 712                              hdes, vdes);
 713
 714         for (i = 0; i < 3; i++) {
 715                 it6505_set_bits(it6505, REG_DATA_CTRL0, ENABLE_PCLK_COUNTER,
 716                                 ENABLE_PCLK_COUNTER);
 717                 usleep_range(10000, 15000);
 718                 it6505_set_bits(it6505, REG_DATA_CTRL0, ENABLE_PCLK_COUNTER,
 719                                 0x00);
 720                 rddata = it6505_read_word(it6505, REG_PCLK_COUNTER_VALUE) &
 721                          0xFFF;
 722
 723                 sum += rddata;
 724         }
 725
 726         if (sum == 0) {
 727                 DRM_DEV_DEBUG_DRIVER(dev, "calc video timing error");
 728                 return;
 729         }
 730
 731         sum /= 3;
 732         pclk = 13500 * 2048 / sum;
 733         it6505->video_info.clock = pclk;
 734         it6505->video_info.hdisplay = hdew;
 735         it6505->video_info.hsync_start = hdew + hfph;
 736         it6505->video_info.hsync_end = hdew + hfph + hsyncw;
 737         it6505->video_info.htotal = htotal;
 738         it6505->video_info.vdisplay = vdew;
 739         it6505->video_info.vsync_start = vdew + vfph;
 740         it6505->video_info.vsync_end = vdew + vfph + vsyncw;
 741         it6505->video_info.vtotal = vtotal;
 742
 743         DRM_DEV_DEBUG_DRIVER(dev, DRM_MODE_FMT,
 744                              DRM_MODE_ARG(&it6505->video_info));
 745 }
 746
 747 static int it6505_drm_dp_link_set_power(struct drm_dp_aux *aux,
 748                                         struct it6505_drm_dp_link *link,
 749                                         u8 mode)
 750 {
 751         u8 value;
 752         int err;
 753
 754         /* DP_SET_POWER register is only available on DPCD v1.1 and later */
 755         if (link->revision < DPCD_V_1_1)
 756                 return 0;
 757
 758         err = drm_dp_dpcd_readb(aux, DP_SET_POWER, &value);
 759         if (err < 0)
 760                 return err;
 761
 762         value &= ~DP_SET_POWER_MASK;
 763         value |= mode;
 764
 765         err = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value);
 766         if (err < 0)
 767                 return err;
 768
 769         if (mode == DP_SET_POWER_D0) {
 770                 /*
 771                  * According to the DP 1.1 specification, a "Sink Device must
 772                  * exit the power saving state within 1 ms" (Section 2.5.3.1,
 773                  * Table 5-52, "Sink Control Field" (register 0x600).
 774                  */
 775                 usleep_range(1000, 2000);
 776         }
 777
 778         return 0;
 779 }
 780
 781 static void it6505_clear_int(struct it6505 *it6505)
 782 {
 783         it6505_write(it6505, INT_STATUS_01, 0xFF);
 784         it6505_write(it6505, INT_STATUS_02, 0xFF);
 785         it6505_write(it6505, INT_STATUS_03, 0xFF);
 786 }
 787
 788 static void it6505_int_mask_enable(struct it6505 *it6505)
 789 {
 790         it6505_write(it6505, INT_MASK_01, BIT(INT_HPD_CHANGE) |
 791                      BIT(INT_RECEIVE_HPD_IRQ) | BIT(INT_SCDT_CHANGE) |
 792                      BIT(INT_HDCP_FAIL) | BIT(INT_HDCP_DONE));
 793
 794         it6505_write(it6505, INT_MASK_02, BIT(INT_AUX_CMD_FAIL) |
 795                      BIT(INT_HDCP_KSV_CHECK) | BIT(INT_AUDIO_FIFO_ERROR));
 796
 797         it6505_write(it6505, INT_MASK_03, BIT(INT_LINK_TRAIN_FAIL) |
 798                      BIT(INT_VID_FIFO_ERROR) | BIT(INT_IO_LATCH_FIFO_OVERFLOW));
 799 }
 800
 801 static void it6505_int_mask_disable(struct it6505 *it6505)
 802 {
 803         it6505_write(it6505, INT_MASK_01, 0x00);
 804         it6505_write(it6505, INT_MASK_02, 0x00);
 805         it6505_write(it6505, INT_MASK_03, 0x00);
 806 }
 807
 808 static void it6505_lane_termination_on(struct it6505 *it6505)
 809 {
 810         int regcf;
 811
 812         regcf = it6505_read(it6505, REG_USER_DRV_PRE);
 813
 814         if (regcf == MISC_VERB)
 815                 it6505_set_bits(it6505, REG_DRV_LN_DATA_SEL, 0x80, 0x00);
 816
 817         if (regcf == MISC_VERC) {
 818                 if (it6505->lane_swap) {
 819                         switch (it6505->lane_count) {
 820                         case 1:
 821                         case 2:
 822                                 it6505_set_bits(it6505, REG_DRV_LN_DATA_SEL,
 823                                                 0x0C, 0x08);
 824                                 break;
 825                         default:
 826                                 it6505_set_bits(it6505, REG_DRV_LN_DATA_SEL,
 827                                                 0x0C, 0x0C);
 828                                 break;
 829                         }
 830                 } else {
 831                         switch (it6505->lane_count) {
 832                         case 1:
 833                         case 2:
 834                                 it6505_set_bits(it6505, REG_DRV_LN_DATA_SEL,
 835                                                 0x0C, 0x04);
 836                                 break;
 837                         default:
 838                                 it6505_set_bits(it6505, REG_DRV_LN_DATA_SEL,
 839                                                 0x0C, 0x0C);
 840                                 break;
 841                         }
 842                 }
 843         }
 844 }
 845
 846 static void it6505_lane_termination_off(struct it6505 *it6505)
 847 {
 848         int regcf;
 849
 850         regcf = it6505_read(it6505, REG_USER_DRV_PRE);
 851
 852         if (regcf == MISC_VERB)
 853                 it6505_set_bits(it6505, REG_DRV_LN_DATA_SEL, 0x80, 0x80);
 854
 855         if (regcf == MISC_VERC)
 856                 it6505_set_bits(it6505, REG_DRV_LN_DATA_SEL, 0x0C, 0x00);
 857 }
 858
 859 static void it6505_lane_power_on(struct it6505 *it6505)
 860 {
 861         it6505_set_bits(it6505, REG_LINK_DRV, 0xF1,
 862                         (it6505->lane_swap ?
 863                                  GENMASK(7, 8 - it6505->lane_count) :
 864                                  GENMASK(3 + it6505->lane_count, 4)) |
 865                                 0x01);
 866 }
 867
 868 static void it6505_lane_power_off(struct it6505 *it6505)
 869 {
 870         it6505_set_bits(it6505, REG_LINK_DRV, 0xF0, 0x00);
 871 }
 872
 873 static void it6505_lane_off(struct it6505 *it6505)
 874 {
 875         it6505_lane_power_off(it6505);
 876         it6505_lane_termination_off(it6505);
 877 }
 878
 879 static void it6505_aux_termination_on(struct it6505 *it6505)
 880 {
 881         int regcf;
 882
 883         regcf = it6505_read(it6505, REG_USER_DRV_PRE);
 884
 885         if (regcf == MISC_VERB)
 886                 it6505_lane_termination_on(it6505);
 887
 888         if (regcf == MISC_VERC)
 889                 it6505_set_bits(it6505, REG_DRV_LN_DATA_SEL, 0x80, 0x80);
 890 }
 891
 892 static void it6505_aux_power_on(struct it6505 *it6505)
 893 {
 894         it6505_set_bits(it6505, REG_AUX, 0x02, 0x02);
 895 }
 896
 897 static void it6505_aux_on(struct it6505 *it6505)
 898 {
 899         it6505_aux_power_on(it6505);
 900         it6505_aux_termination_on(it6505);
 901 }
 902
 903 static void it6505_aux_reset(struct it6505 *it6505)
 904 {
 905         it6505_set_bits(it6505, REG_RESET_CTRL, AUX_RESET, AUX_RESET);
 906         it6505_set_bits(it6505, REG_RESET_CTRL, AUX_RESET, 0x00);
 907 }
 908
 909 static void it6505_reset_logic(struct it6505 *it6505)
 910 {
 911         regmap_write(it6505->regmap, REG_RESET_CTRL, ALL_LOGIC_RESET);
 912         usleep_range(1000, 1500);
 913 }
 914
 915 static bool it6505_aux_op_finished(struct it6505 *it6505)
 916 {
 917         int reg2b = it6505_read(it6505, REG_AUX_CMD_REQ);
 918
 919         if (reg2b < 0)
 920                 return false;
 921
 922         return (reg2b & AUX_BUSY) == 0;
 923 }
 924
 925 static int it6505_aux_wait(struct it6505 *it6505)
 926 {
 927         int status;
 928         unsigned long timeout;
 929         struct device *dev = it6505->dev;
 930
 931         timeout = jiffies + msecs_to_jiffies(AUX_WAIT_TIMEOUT_MS) + 1;
 932
 933         while (!it6505_aux_op_finished(it6505)) {
 934                 if (time_after(jiffies, timeout)) {
 935                         dev_err(dev, "Timed out waiting AUX to finish");
 936                         return -ETIMEDOUT;
 937                 }
 938                 usleep_range(1000, 2000);
 939         }
 940
 941         status = it6505_read(it6505, REG_AUX_ERROR_STS);
 942         if (status < 0) {
 943                 dev_err(dev, "Failed to read AUX channel: %d", status);
 944                 return status;
 945         }
 946
 947         return 0;
 948 }
 949
 950 static ssize_t it6505_aux_operation(struct it6505 *it6505,
 951                                     enum aux_cmd_type cmd,
 952                                     unsigned int address, u8 *buffer,
 953                                     size_t size, enum aux_cmd_reply *reply)
 954 {
 955         int i, ret;
 956         bool aux_write_check = false;
 957
 958         if (!it6505_get_sink_hpd_status(it6505))
 959                 return -EIO;
 960
 961         /* set AUX user mode */
 962         it6505_set_bits(it6505, REG_AUX_CTRL, AUX_USER_MODE, AUX_USER_MODE);
 963
 964 aux_op_start:
 965         if (cmd == CMD_AUX_I2C_EDID_READ) {
 966                 /* AUX EDID FIFO has max length of AUX_FIFO_MAX_SIZE bytes. */
 967                 size = min_t(size_t, size, AUX_FIFO_MAX_SIZE);
 968                 /* Enable AUX FIFO read back and clear FIFO */
 969                 it6505_set_bits(it6505, REG_AUX_CTRL,
 970                                 AUX_EN_FIFO_READ | CLR_EDID_FIFO,
 971                                 AUX_EN_FIFO_READ | CLR_EDID_FIFO);
 972
 973                 it6505_set_bits(it6505, REG_AUX_CTRL,
 974                                 AUX_EN_FIFO_READ | CLR_EDID_FIFO,
 975                                 AUX_EN_FIFO_READ);
 976         } else {
 977                 /* The DP AUX transmit buffer has 4 bytes. */
 978                 size = min_t(size_t, size, 4);
 979                 it6505_set_bits(it6505, REG_AUX_CTRL, AUX_NO_SEGMENT_WR,
 980                                 AUX_NO_SEGMENT_WR);
 981         }
 982
 983         /* Start Address[7:0] */
 984         it6505_write(it6505, REG_AUX_ADR_0_7, (address >> 0) & 0xFF);
 985         /* Start Address[15:8] */
 986         it6505_write(it6505, REG_AUX_ADR_8_15, (address >> 8) & 0xFF);
 987         /* WriteNum[3:0]+StartAdr[19:16] */
 988         it6505_write(it6505, REG_AUX_ADR_16_19,
 989                      ((address >> 16) & 0x0F) | ((size - 1) << 4));
 990
 991         if (cmd == CMD_AUX_NATIVE_WRITE)
 992                 regmap_bulk_write(it6505->regmap, REG_AUX_OUT_DATA0, buffer,
 993                                   size);
 994
 995         /* Aux Fire */
 996         it6505_write(it6505, REG_AUX_CMD_REQ, cmd);
 997
 998         ret = it6505_aux_wait(it6505);
 999         if (ret < 0)
1000                 goto aux_op_err;
1001
1002         ret = it6505_read(it6505, REG_AUX_ERROR_STS);
1003         if (ret < 0)
1004                 goto aux_op_err;
1005
1006         switch ((ret >> 6) & 0x3) {
1007         case 0:
1008                 *reply = REPLY_ACK;
1009                 break;
1010         case 1:
1011                 *reply = REPLY_DEFER;
1012                 ret = -EAGAIN;
1013                 goto aux_op_err;
1014         case 2:
1015                 *reply = REPLY_NACK;
1016                 ret = -EIO;
1017                 goto aux_op_err;
1018         case 3:
1019                 ret = -ETIMEDOUT;
1020                 goto aux_op_err;
1021         }
1022
1023         /* Read back Native Write data */
1024         if (cmd == CMD_AUX_NATIVE_WRITE) {
1025                 aux_write_check = true;
1026                 cmd = CMD_AUX_NATIVE_READ;
1027                 goto aux_op_start;
1028         }
1029
1030         if (cmd == CMD_AUX_I2C_EDID_READ) {
1031                 for (i = 0; i < size; i++) {
1032                         ret = it6505_read(it6505, REG_AUX_DATA_FIFO);
1033                         if (ret < 0)
1034                                 goto aux_op_err;
1035                         buffer[i] = ret;
1036                 }
1037         } else {
1038                 for (i = 0; i < size; i++) {
1039                         ret = it6505_read(it6505, REG_AUX_DATA_0_7 + i);
1040                         if (ret < 0)
1041                                 goto aux_op_err;
1042
1043                         if (aux_write_check && buffer[size - 1 - i] != ret) {
1044                                 ret = -EINVAL;
1045                                 goto aux_op_err;
1046                         }
1047
1048                         buffer[size - 1 - i] = ret;
1049                 }
1050         }
1051
1052         ret = i;
1053
1054 aux_op_err:
1055         if (cmd == CMD_AUX_I2C_EDID_READ) {
1056                 /* clear AUX FIFO */
1057                 it6505_set_bits(it6505, REG_AUX_CTRL,
1058                                 AUX_EN_FIFO_READ | CLR_EDID_FIFO,
1059                                 AUX_EN_FIFO_READ | CLR_EDID_FIFO);
1060                 it6505_set_bits(it6505, REG_AUX_CTRL,
1061                                 AUX_EN_FIFO_READ | CLR_EDID_FIFO, 0x00);
1062         }
1063
1064         /* Leave AUX user mode */
1065         it6505_set_bits(it6505, REG_AUX_CTRL, AUX_USER_MODE, 0);
1066
1067         return ret;
1068 }
1069
1070 static ssize_t it6505_aux_do_transfer(struct it6505 *it6505,
1071                                       enum aux_cmd_type cmd,
1072                                       unsigned int address, u8 *buffer,
1073                                       size_t size, enum aux_cmd_reply *reply)
1074 {
1075         int i, ret_size, ret = 0, request_size;
1076
1077         mutex_lock(&it6505->aux_lock);
1078         for (i = 0; i < size; i += 4) {
1079                 request_size = min((int)size - i, 4);
1080                 ret_size = it6505_aux_operation(it6505, cmd, address + i,
1081                                                 buffer + i, request_size,
1082                                                 reply);
1083                 if (ret_size < 0) {
1084                         ret = ret_size;
1085                         goto aux_op_err;
1086                 }
1087
1088                 ret += ret_size;
1089         }
1090
1091 aux_op_err:
1092         mutex_unlock(&it6505->aux_lock);
1093         return ret;
1094 }
1095
1096 static ssize_t it6505_aux_transfer(struct drm_dp_aux *aux,
1097                                    struct drm_dp_aux_msg *msg)
1098 {
1099         struct it6505 *it6505 = container_of(aux, struct it6505, aux);
1100         u8 cmd;
1101         bool is_i2c = !(msg->request & DP_AUX_NATIVE_WRITE);
1102         int ret;
1103         enum aux_cmd_reply reply;
1104
1105         /* IT6505 doesn't support arbitrary I2C read / write. */
1106         if (is_i2c)
1107                 return -EINVAL;
1108
1109         switch (msg->request) {
1110         case DP_AUX_NATIVE_READ:
1111                 cmd = CMD_AUX_NATIVE_READ;
1112                 break;
1113         case DP_AUX_NATIVE_WRITE:
1114                 cmd = CMD_AUX_NATIVE_WRITE;
1115                 break;
1116         default:
1117                 return -EINVAL;
1118         }
1119
1120         ret = it6505_aux_do_transfer(it6505, cmd, msg->address, msg->buffer,
1121                                      msg->size, &reply);
1122         if (ret < 0)
1123                 return ret;
1124
1125         switch (reply) {
1126         case REPLY_ACK:
1127                 msg->reply = DP_AUX_NATIVE_REPLY_ACK;
1128                 break;
1129         case REPLY_NACK:
1130                 msg->reply = DP_AUX_NATIVE_REPLY_NACK;
1131                 break;
1132         case REPLY_DEFER:
1133                 msg->reply = DP_AUX_NATIVE_REPLY_DEFER;
1134                 break;
1135         }
1136
1137         return ret;
1138 }
1139
1140 static int it6505_get_edid_block(void *data, u8 *buf, unsigned int block,
1141                                  size_t len)
1142 {
1143         struct it6505 *it6505 = data;
1144         struct device *dev = it6505->dev;
1145         enum aux_cmd_reply reply;
1146         int offset, ret, aux_retry = 100;
1147
1148         it6505_aux_reset(it6505);
1149         DRM_DEV_DEBUG_DRIVER(dev, "block number = %d", block);
1150
1151         for (offset = 0; offset < EDID_LENGTH;) {
1152                 ret = it6505_aux_do_transfer(it6505, CMD_AUX_I2C_EDID_READ,
1153                                              block * EDID_LENGTH + offset,
1154                                              buf + offset, 8, &reply);
1155
1156                 if (ret < 0 && ret != -EAGAIN)
1157                         return ret;
1158
1159                 switch (reply) {
1160                 case REPLY_ACK:
1161                         DRM_DEV_DEBUG_DRIVER(dev, "[0x%02x]: %8ph", offset,
1162                                              buf + offset);
1163                         offset += 8;
1164                         aux_retry = 100;
1165                         break;
1166                 case REPLY_NACK:
1167                         return -EIO;
1168                 case REPLY_DEFER:
1169                         msleep(20);
1170                         if (!(--aux_retry))
1171                                 return -EIO;
1172                 }
1173         }
1174
1175         return 0;
1176 }
1177
1178 static void it6505_variable_config(struct it6505 *it6505)
1179 {
1180         it6505->link_rate_bw_code = HBR;
1181         it6505->lane_count = MAX_LANE_COUNT;
1182         it6505->link_state = LINK_IDLE;
1183         it6505->hdcp_desired = HDCP_DESIRED;
1184         it6505->auto_train_retry = AUTO_TRAIN_RETRY;
1185         it6505->audio.select = AUDIO_SELECT;
1186         it6505->audio.sample_rate = AUDIO_SAMPLE_RATE;
1187         it6505->audio.channel_count = AUDIO_CHANNEL_COUNT;
1188         it6505->audio.type = AUDIO_TYPE;
1189         it6505->audio.i2s_input_format = I2S_INPUT_FORMAT;
1190         it6505->audio.i2s_justified = I2S_JUSTIFIED;
1191         it6505->audio.i2s_data_delay = I2S_DATA_DELAY;
1192         it6505->audio.i2s_ws_channel = I2S_WS_CHANNEL;
1193         it6505->audio.i2s_data_sequence = I2S_DATA_SEQUENCE;
1194         it6505->audio.word_length = AUDIO_WORD_LENGTH;
1195         memset(it6505->sha1_input, 0, sizeof(it6505->sha1_input));
1196         memset(it6505->bksvs, 0, sizeof(it6505->bksvs));
1197 }
1198
1199 static int it6505_send_video_infoframe(struct it6505 *it6505,
1200                                        struct hdmi_avi_infoframe *frame)
1201 {
1202         u8 buffer[HDMI_INFOFRAME_HEADER_SIZE + HDMI_AVI_INFOFRAME_SIZE];
1203         int err;
1204         struct device *dev = it6505->dev;
1205
1206         err = hdmi_avi_infoframe_pack(frame, buffer, sizeof(buffer));
1207         if (err < 0) {
1208                 dev_err(dev, "Failed to pack AVI infoframe: %d", err);
1209                 return err;
1210         }
1211
1212         err = it6505_set_bits(it6505, REG_INFOFRAME_CTRL, EN_AVI_PKT, 0x00);
1213         if (err)
1214                 return err;
1215
1216         err = regmap_bulk_write(it6505->regmap, REG_AVI_INFO_DB1,
1217                                 buffer + HDMI_INFOFRAME_HEADER_SIZE,
1218                                 frame->length);
1219         if (err)
1220                 return err;
1221
1222         err = it6505_set_bits(it6505, REG_INFOFRAME_CTRL, EN_AVI_PKT,
1223                               EN_AVI_PKT);
1224         if (err)
1225                 return err;
1226
1227         return 0;
1228 }
1229
1230 static void it6505_get_extcon_property(struct it6505 *it6505)
1231 {
1232         int err;
1233         union extcon_property_value property;
1234         struct device *dev = it6505->dev;
1235
1236         if (it6505->extcon && !it6505->lane_swap_disabled) {
1237                 err = extcon_get_property(it6505->extcon, EXTCON_DISP_DP,
1238                                           EXTCON_PROP_USB_TYPEC_POLARITY,
1239                                           &property);
1240                 if (err) {
1241                         dev_err(dev, "get property fail!");
1242                         return;
1243                 }
1244                 it6505->lane_swap = property.intval;
1245         }
1246 }
1247
1248 static void it6505_clk_phase_adjustment(struct it6505 *it6505,
1249                                         const struct drm_display_mode *mode)
1250 {
1251         int clock = mode->clock;
1252
1253         it6505_set_bits(it6505, REG_CLK_CTRL0, M_PCLK_DELAY,
1254                         clock < ADJUST_PHASE_THRESHOLD ? PIXEL_CLK_DELAY : 0);
1255         it6505_set_bits(it6505, REG_DATA_CTRL0, VIDEO_LATCH_EDGE,
1256                         PIXEL_CLK_INVERSE << 4);
1257 }
1258
1259 static void it6505_link_reset_step_train(struct it6505 *it6505)
1260 {
1261         it6505_set_bits(it6505, REG_TRAIN_CTRL0,
1262                         FORCE_CR_DONE | FORCE_EQ_DONE, 0x00);
1263         it6505_dpcd_write(it6505, DP_TRAINING_PATTERN_SET,
1264                           DP_TRAINING_PATTERN_DISABLE);
1265 }
1266
1267 static void it6505_init(struct it6505 *it6505)
1268 {
1269         it6505_write(it6505, REG_AUX_OPT, AUX_AUTO_RST | AUX_FIX_FREQ);
1270         it6505_write(it6505, REG_AUX_CTRL, AUX_NO_SEGMENT_WR);
1271         it6505_write(it6505, REG_HDCP_CTRL2, HDCP_AN_SEL | HDCP_HW_HPDIRQ_ACT);
1272         it6505_write(it6505, REG_VID_BUS_CTRL0, IN_DDR | DDR_CD);
1273         it6505_write(it6505, REG_VID_BUS_CTRL1, 0x01);
1274         it6505_write(it6505, REG_AUDIO_CTRL0, AUDIO_16B_BOUND);
1275
1276         /* chip internal setting, don't modify */
1277         it6505_write(it6505, REG_HPD_IRQ_TIME, 0xF5);
1278         it6505_write(it6505, REG_AUX_DEBUG_MODE, 0x4D);
1279         it6505_write(it6505, REG_AUX_OPT2, 0x17);
1280         it6505_write(it6505, REG_HDCP_OPT, 0x60);
1281         it6505_write(it6505, REG_DATA_MUTE_CTRL,
1282                      EN_VID_MUTE | EN_AUD_MUTE | ENABLE_AUTO_VIDEO_FIFO_RESET);
1283         it6505_write(it6505, REG_TIME_STMP_CTRL,
1284                      EN_SSC_GAT | EN_ENHANCE_VID_STMP | EN_ENHANCE_AUD_STMP);
1285         it6505_write(it6505, REG_INFOFRAME_CTRL, 0x00);
1286         it6505_write(it6505, REG_DRV_0_DB_800_MV,
1287                      afe_setting_table[it6505->afe_setting][0]);
1288         it6505_write(it6505, REG_PRE_0_DB_800_MV,
1289                      afe_setting_table[it6505->afe_setting][1]);
1290         it6505_write(it6505, REG_PRE_3P5_DB_800_MV,
1291                      afe_setting_table[it6505->afe_setting][2]);
1292         it6505_write(it6505, REG_SSC_CTRL0, 0x9E);
1293         it6505_write(it6505, REG_SSC_CTRL1, 0x1C);
1294         it6505_write(it6505, REG_SSC_CTRL2, 0x42);
1295 }
1296
1297 static void it6505_video_disable(struct it6505 *it6505)
1298 {
1299         it6505_set_bits(it6505, REG_DATA_MUTE_CTRL, EN_VID_MUTE, EN_VID_MUTE);
1300         it6505_set_bits(it6505, REG_INFOFRAME_CTRL, EN_VID_CTRL_PKT, 0x00);
1301         it6505_set_bits(it6505, REG_RESET_CTRL, VIDEO_RESET, VIDEO_RESET);
1302 }
1303
1304 static void it6505_video_reset(struct it6505 *it6505)
1305 {
1306         it6505_link_reset_step_train(it6505);
1307         it6505_set_bits(it6505, REG_DATA_MUTE_CTRL, EN_VID_MUTE, EN_VID_MUTE);
1308         it6505_set_bits(it6505, REG_INFOFRAME_CTRL, EN_VID_CTRL_PKT, 0x00);
1309         it6505_set_bits(it6505, REG_RESET_CTRL, VIDEO_RESET, VIDEO_RESET);
1310         it6505_set_bits(it6505, REG_501_FIFO_CTRL, RST_501_FIFO, RST_501_FIFO);
1311         it6505_set_bits(it6505, REG_501_FIFO_CTRL, RST_501_FIFO, 0x00);
1312         it6505_set_bits(it6505, REG_RESET_CTRL, VIDEO_RESET, 0x00);
1313 }
1314
1315 static void it6505_update_video_parameter(struct it6505 *it6505,
1316                                           const struct drm_display_mode *mode)
1317 {
1318         it6505_clk_phase_adjustment(it6505, mode);
1319         it6505_video_disable(it6505);
1320 }
1321
1322 static bool it6505_audio_input(struct it6505 *it6505)
1323 {
1324         int reg05, regbe;
1325
1326         reg05 = it6505_read(it6505, REG_RESET_CTRL);
1327         it6505_set_bits(it6505, REG_RESET_CTRL, AUDIO_RESET, 0x00);
1328         usleep_range(3000, 4000);
1329         regbe = it6505_read(it6505, REG_AUDIO_INPUT_FREQ);
1330         it6505_write(it6505, REG_RESET_CTRL, reg05);
1331
1332         return regbe != 0xFF;
1333 }
1334
1335 static void it6505_setup_audio_channel_status(struct it6505 *it6505)
1336 {
1337         enum it6505_audio_sample_rate sample_rate = it6505->audio.sample_rate;
1338         u8 audio_word_length_map[] = { 0x02, 0x04, 0x03, 0x0B };
1339
1340         /* Channel Status */
1341         it6505_write(it6505, REG_IEC958_STS0, it6505->audio.type << 1);
1342         it6505_write(it6505, REG_IEC958_STS1, 0x00);
1343         it6505_write(it6505, REG_IEC958_STS2, 0x00);
1344         it6505_write(it6505, REG_IEC958_STS3, sample_rate);
1345         it6505_write(it6505, REG_IEC958_STS4, (~sample_rate << 4) |
1346                      audio_word_length_map[it6505->audio.word_length]);
1347 }
1348
1349 static void it6505_setup_audio_format(struct it6505 *it6505)
1350 {
1351         /* I2S MODE */
1352         it6505_write(it6505, REG_AUDIO_FMT,
1353                      (it6505->audio.word_length << 5) |
1354                      (it6505->audio.i2s_data_sequence << 4) |
1355                      (it6505->audio.i2s_ws_channel << 3) |
1356                      (it6505->audio.i2s_data_delay << 2) |
1357                      (it6505->audio.i2s_justified << 1) |
1358                      it6505->audio.i2s_input_format);
1359         if (it6505->audio.select == SPDIF) {
1360                 it6505_write(it6505, REG_AUDIO_FIFO_SEL, 0x00);
1361                 /* 0x30 = 128*FS */
1362                 it6505_set_bits(it6505, REG_AUX_OPT, 0xF0, 0x30);
1363         } else {
1364                 it6505_write(it6505, REG_AUDIO_FIFO_SEL, 0xE4);
1365         }
1366
1367         it6505_write(it6505, REG_AUDIO_CTRL0, 0x20);
1368         it6505_write(it6505, REG_AUDIO_CTRL1, 0x00);
1369 }
1370
1371 static void it6505_enable_audio_source(struct it6505 *it6505)
1372 {
1373         unsigned int audio_source_count;
1374
1375         audio_source_count = BIT(DIV_ROUND_UP(it6505->audio.channel_count, 2))
1376                                  - 1;
1377
1378         audio_source_count |= it6505->audio.select << 4;
1379
1380         it6505_write(it6505, REG_AUDIO_SRC_CTRL, audio_source_count);
1381 }
1382
1383 static void it6505_enable_audio_infoframe(struct it6505 *it6505)
1384 {
1385         struct device *dev = it6505->dev;
1386         u8 audio_info_ca[] = { 0x00, 0x00, 0x01, 0x03, 0x07, 0x0B, 0x0F, 0x1F };
1387
1388         DRM_DEV_DEBUG_DRIVER(dev, "infoframe channel_allocation:0x%02x",
1389                              audio_info_ca[it6505->audio.channel_count - 1]);
1390
1391         it6505_write(it6505, REG_AUD_INFOFRAM_DB1, it6505->audio.channel_count
1392                      - 1);
1393         it6505_write(it6505, REG_AUD_INFOFRAM_DB2, 0x00);
1394         it6505_write(it6505, REG_AUD_INFOFRAM_DB3,
1395                      audio_info_ca[it6505->audio.channel_count - 1]);
1396         it6505_write(it6505, REG_AUD_INFOFRAM_DB4, 0x00);
1397         it6505_write(it6505, REG_AUD_INFOFRAM_SUM, 0x00);
1398
1399         /* Enable Audio InfoFrame */
1400         it6505_set_bits(it6505, REG_INFOFRAME_CTRL, EN_AUD_CTRL_PKT,
1401                         EN_AUD_CTRL_PKT);
1402 }
1403
1404 static void it6505_disable_audio(struct it6505 *it6505)
1405 {
1406         it6505_set_bits(it6505, REG_DATA_MUTE_CTRL, EN_AUD_MUTE, EN_AUD_MUTE);
1407         it6505_set_bits(it6505, REG_AUDIO_SRC_CTRL, M_AUDIO_I2S_EN, 0x00);
1408         it6505_set_bits(it6505, REG_INFOFRAME_CTRL, EN_AUD_CTRL_PKT, 0x00);
1409         it6505_set_bits(it6505, REG_RESET_CTRL, AUDIO_RESET, AUDIO_RESET);
1410 }
1411
1412 static void it6505_enable_audio(struct it6505 *it6505)
1413 {
1414         struct device *dev = it6505->dev;
1415         int regbe;
1416
1417         DRM_DEV_DEBUG_DRIVER(dev, "start");
1418         it6505_disable_audio(it6505);
1419
1420         it6505_setup_audio_channel_status(it6505);
1421         it6505_setup_audio_format(it6505);
1422         it6505_enable_audio_source(it6505);
1423         it6505_enable_audio_infoframe(it6505);
1424
1425         it6505_write(it6505, REG_AUDIO_N_0_7, 0x00);
1426         it6505_write(it6505, REG_AUDIO_N_8_15, 0x80);
1427         it6505_write(it6505, REG_AUDIO_N_16_23, 0x00);
1428
1429         it6505_set_bits(it6505, REG_AUDIO_SRC_CTRL, AUDIO_FIFO_RESET,
1430                         AUDIO_FIFO_RESET);
1431         it6505_set_bits(it6505, REG_AUDIO_SRC_CTRL, AUDIO_FIFO_RESET, 0x00);
1432         it6505_set_bits(it6505, REG_RESET_CTRL, AUDIO_RESET, 0x00);
1433         regbe = it6505_read(it6505, REG_AUDIO_INPUT_FREQ);
1434         DRM_DEV_DEBUG_DRIVER(dev, "regbe:0x%02x audio input fs: %d.%d kHz",
1435                              regbe, 6750 / regbe, (6750 % regbe) * 10 / regbe);
1436         it6505_set_bits(it6505, REG_DATA_MUTE_CTRL, EN_AUD_MUTE, 0x00);
1437 }
1438
1439 static bool it6505_use_step_train_check(struct it6505 *it6505)
1440 {
1441         if (it6505->link.revision >= 0x12)
1442                 return it6505->dpcd[DP_TRAINING_AUX_RD_INTERVAL] >= 0x01;
1443
1444         return true;
1445 }
1446
1447 static void it6505_parse_link_capabilities(struct it6505 *it6505)
1448 {
1449         struct device *dev = it6505->dev;
1450         struct it6505_drm_dp_link *link = &it6505->link;
1451         int bcaps;
1452
1453         if (it6505->dpcd[0] == 0) {
1454                 dev_err(dev, "DPCD is not initialized");
1455                 return;
1456         }
1457
1458         memset(link, 0, sizeof(*link));
1459
1460         link->revision = it6505->dpcd[0];
1461         link->rate = drm_dp_bw_code_to_link_rate(it6505->dpcd[1]);
1462         link->num_lanes = it6505->dpcd[2] & DP_MAX_LANE_COUNT_MASK;
1463
1464         if (it6505->dpcd[2] & DP_ENHANCED_FRAME_CAP)
1465                 link->capabilities = DP_ENHANCED_FRAME_CAP;
1466
1467         DRM_DEV_DEBUG_DRIVER(dev, "DPCD Rev.: %d.%d",
1468                              link->revision >> 4, link->revision & 0x0F);
1469
1470         DRM_DEV_DEBUG_DRIVER(dev, "Sink max link rate: %d.%02d Gbps per lane",
1471                              link->rate / 100000, link->rate / 1000 % 100);
1472
1473         it6505->link_rate_bw_code = drm_dp_link_rate_to_bw_code(link->rate);
1474         DRM_DEV_DEBUG_DRIVER(dev, "link rate bw code:0x%02x",
1475                              it6505->link_rate_bw_code);
1476         it6505->link_rate_bw_code = min_t(int, it6505->link_rate_bw_code,
1477                                           MAX_LINK_RATE);
1478
1479         it6505->lane_count = link->num_lanes;
1480         DRM_DEV_DEBUG_DRIVER(dev, "Sink support %d lanes training",
1481                              it6505->lane_count);
1482         it6505->lane_count = min_t(int, it6505->lane_count,
1483                                    it6505->max_lane_count);
1484
1485         it6505->branch_device = drm_dp_is_branch(it6505->dpcd);
1486         DRM_DEV_DEBUG_DRIVER(dev, "Sink %sbranch device",
1487                              it6505->branch_device ? "" : "Not ");
1488
1489         it6505->enable_enhanced_frame = link->capabilities;
1490         DRM_DEV_DEBUG_DRIVER(dev, "Sink %sSupport Enhanced Framing",
1491                              it6505->enable_enhanced_frame ? "" : "Not ");
1492
1493         it6505->enable_ssc = (it6505->dpcd[DP_MAX_DOWNSPREAD] &
1494                                 DP_MAX_DOWNSPREAD_0_5);
1495         DRM_DEV_DEBUG_DRIVER(dev, "Maximum Down-Spread: %s, %ssupport SSC!",
1496                              it6505->enable_ssc ? "0.5" : "0",
1497                              it6505->enable_ssc ? "" : "Not ");
1498
1499         it6505->step_train = it6505_use_step_train_check(it6505);
1500         if (it6505->step_train)
1501                 DRM_DEV_DEBUG_DRIVER(dev, "auto train fail, will step train");
1502
1503         bcaps = it6505_dpcd_read(it6505, DP_AUX_HDCP_BCAPS);
1504         DRM_DEV_DEBUG_DRIVER(dev, "bcaps:0x%02x", bcaps);
1505         if (bcaps & DP_BCAPS_HDCP_CAPABLE) {
1506                 it6505->is_repeater = (bcaps & DP_BCAPS_REPEATER_PRESENT);
1507                 DRM_DEV_DEBUG_DRIVER(dev, "Support HDCP! Downstream is %s!",
1508                                      it6505->is_repeater ? "repeater" :
1509                                      "receiver");
1510         } else {
1511                 DRM_DEV_DEBUG_DRIVER(dev, "Sink not support HDCP!");
1512                 it6505->hdcp_desired = false;
1513         }
1514         DRM_DEV_DEBUG_DRIVER(dev, "HDCP %s",
1515                              it6505->hdcp_desired ? "desired" : "undesired");
1516 }
1517
1518 static void it6505_setup_ssc(struct it6505 *it6505)
1519 {
1520         it6505_set_bits(it6505, REG_TRAIN_CTRL0, SPREAD_AMP_5,
1521                         it6505->enable_ssc ? SPREAD_AMP_5 : 0x00);
1522         if (it6505->enable_ssc) {
1523                 it6505_write(it6505, REG_SSC_CTRL0, 0x9E);
1524                 it6505_write(it6505, REG_SSC_CTRL1, 0x1C);
1525                 it6505_write(it6505, REG_SSC_CTRL2, 0x42);
1526                 it6505_write(it6505, REG_SP_CTRL0, 0x07);
1527                 it6505_write(it6505, REG_IP_CTRL1, 0x29);
1528                 it6505_write(it6505, REG_IP_CTRL2, 0x03);
1529                 /* Stamp Interrupt Step */
1530                 it6505_set_bits(it6505, REG_TIME_STMP_CTRL, M_STAMP_STEP,
1531                                 0x10);
1532                 it6505_dpcd_write(it6505, DP_DOWNSPREAD_CTRL,
1533                                   DP_SPREAD_AMP_0_5);
1534         } else {
1535                 it6505_dpcd_write(it6505, DP_DOWNSPREAD_CTRL, 0x00);
1536                 it6505_set_bits(it6505, REG_TIME_STMP_CTRL, M_STAMP_STEP,
1537                                 0x00);
1538         }
1539 }
1540
1541 static inline void it6505_link_rate_setup(struct it6505 *it6505)
1542 {
1543         it6505_set_bits(it6505, REG_TRAIN_CTRL0, FORCE_LBR,
1544                         (it6505->link_rate_bw_code == RBR) ? FORCE_LBR : 0x00);
1545         it6505_set_bits(it6505, REG_LINK_DRV, DRV_HS,
1546                         (it6505->link_rate_bw_code == RBR) ? 0x00 : DRV_HS);
1547 }
1548
1549 static void it6505_lane_count_setup(struct it6505 *it6505)
1550 {
1551         it6505_get_extcon_property(it6505);
1552         it6505_set_bits(it6505, REG_TRAIN_CTRL0, LANE_SWAP,
1553                         it6505->lane_swap ? LANE_SWAP : 0x00);
1554         it6505_set_bits(it6505, REG_TRAIN_CTRL0, LANE_COUNT_MASK,
1555                         (it6505->lane_count - 1) << 1);
1556 }
1557
1558 static void it6505_link_training_setup(struct it6505 *it6505)
1559 {
1560         struct device *dev = it6505->dev;
1561
1562         if (it6505->enable_enhanced_frame)
1563                 it6505_set_bits(it6505, REG_DATA_MUTE_CTRL,
1564                                 ENABLE_ENHANCED_FRAME, ENABLE_ENHANCED_FRAME);
1565
1566         it6505_link_rate_setup(it6505);
1567         it6505_lane_count_setup(it6505);
1568         it6505_setup_ssc(it6505);
1569         DRM_DEV_DEBUG_DRIVER(dev,
1570                              "%s, %d lanes, %sable ssc, %sable enhanced frame",
1571                              it6505->link_rate_bw_code != RBR ? "HBR" : "RBR",
1572                              it6505->lane_count,
1573                              it6505->enable_ssc ? "en" : "dis",
1574                              it6505->enable_enhanced_frame ? "en" : "dis");
1575 }
1576
1577 static bool it6505_link_start_auto_train(struct it6505 *it6505)
1578 {
1579         int timeout = 500, link_training_state;
1580         bool state = false;
1581
1582         mutex_lock(&it6505->aux_lock);
1583         it6505_set_bits(it6505, REG_TRAIN_CTRL0,
1584                         FORCE_CR_DONE | FORCE_EQ_DONE, 0x00);
1585         it6505_write(it6505, REG_TRAIN_CTRL1, FORCE_RETRAIN);
1586         it6505_write(it6505, REG_TRAIN_CTRL1, AUTO_TRAIN);
1587
1588         while (timeout > 0) {
1589                 usleep_range(1000, 2000);
1590                 link_training_state = it6505_read(it6505, REG_LINK_TRAIN_STS);
1591
1592                 if (link_training_state > 0 &&
1593                     (link_training_state & LINK_STATE_NORP)) {
1594                         state = true;
1595                         goto unlock;
1596                 }
1597
1598                 timeout--;
1599         }
1600 unlock:
1601         mutex_unlock(&it6505->aux_lock);
1602
1603         return state;
1604 }
1605
1606 static int it6505_drm_dp_link_configure(struct it6505 *it6505)
1607 {
1608         u8 values[2];
1609         int err;
1610         struct drm_dp_aux *aux = &it6505->aux;
1611
1612         values[0] = it6505->link_rate_bw_code;
1613         values[1] = it6505->lane_count;
1614
1615         if (it6505->enable_enhanced_frame)
1616                 values[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
1617
1618         err = drm_dp_dpcd_write(aux, DP_LINK_BW_SET, values, sizeof(values));
1619         if (err < 0)
1620                 return err;
1621
1622         return 0;
1623 }
1624
1625 static bool it6505_check_voltage_swing_max(u8 lane_voltage_swing_pre_emphasis)
1626 {
1627         return ((lane_voltage_swing_pre_emphasis & 0x03) == MAX_CR_LEVEL);
1628 }
1629
1630 static bool it6505_check_pre_emphasis_max(u8 lane_voltage_swing_pre_emphasis)
1631 {
1632         return ((lane_voltage_swing_pre_emphasis & 0x03) == MAX_EQ_LEVEL);
1633 }
1634
1635 static bool it6505_check_max_voltage_swing_reached(u8 *lane_voltage_swing,
1636                                                    u8 lane_count)
1637 {
1638         u8 i;
1639
1640         for (i = 0; i < lane_count; i++) {
1641                 if (lane_voltage_swing[i] & DP_TRAIN_MAX_SWING_REACHED)
1642                         return true;
1643         }
1644
1645         return false;
1646 }
1647
1648 static bool
1649 step_train_lane_voltage_para_set(struct it6505 *it6505,
1650                                  struct it6505_step_train_para
1651                                  *lane_voltage_pre_emphasis,
1652                                  u8 *lane_voltage_pre_emphasis_set)
1653 {
1654         u8 *voltage_swing = lane_voltage_pre_emphasis->voltage_swing;
1655         u8 *pre_emphasis = lane_voltage_pre_emphasis->pre_emphasis;
1656         u8 i;
1657
1658         for (i = 0; i < it6505->lane_count; i++) {
1659                 voltage_swing[i] &= 0x03;
1660                 lane_voltage_pre_emphasis_set[i] = voltage_swing[i];
1661                 if (it6505_check_voltage_swing_max(voltage_swing[i]))
1662                         lane_voltage_pre_emphasis_set[i] |=
1663                                 DP_TRAIN_MAX_SWING_REACHED;
1664
1665                 pre_emphasis[i] &= 0x03;
1666                 lane_voltage_pre_emphasis_set[i] |= pre_emphasis[i]
1667                         << DP_TRAIN_PRE_EMPHASIS_SHIFT;
1668                 if (it6505_check_pre_emphasis_max(pre_emphasis[i]))
1669                         lane_voltage_pre_emphasis_set[i] |=
1670                                 DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
1671                 it6505_dpcd_write(it6505, DP_TRAINING_LANE0_SET + i,
1672                                   lane_voltage_pre_emphasis_set[i]);
1673
1674                 if (lane_voltage_pre_emphasis_set[i] !=
1675                     it6505_dpcd_read(it6505, DP_TRAINING_LANE0_SET + i))
1676                         return false;
1677         }
1678
1679         return true;
1680 }
1681
1682 static bool
1683 it6505_step_cr_train(struct it6505 *it6505,
1684                      struct it6505_step_train_para *lane_voltage_pre_emphasis)
1685 {
1686         u8 loop_count = 0, i = 0, j;
1687         u8 link_status[DP_LINK_STATUS_SIZE] = { 0 };
1688         u8 lane_level_config[MAX_LANE_COUNT] = { 0 };
1689         int pre_emphasis_adjust = -1, voltage_swing_adjust = -1;
1690         const struct drm_dp_aux *aux = &it6505->aux;
1691
1692         it6505_dpcd_write(it6505, DP_DOWNSPREAD_CTRL,
1693                           it6505->enable_ssc ? DP_SPREAD_AMP_0_5 : 0x00);
1694         it6505_dpcd_write(it6505, DP_TRAINING_PATTERN_SET,
1695                           DP_TRAINING_PATTERN_1);
1696
1697         while (loop_count < 5 && i < 10) {
1698                 i++;
1699                 if (!step_train_lane_voltage_para_set(it6505,
1700                                                       lane_voltage_pre_emphasis,
1701                                                       lane_level_config))
1702                         continue;
1703                 drm_dp_link_train_clock_recovery_delay(aux, it6505->dpcd);
1704                 drm_dp_dpcd_read_link_status(&it6505->aux, link_status);
1705
1706                 if (drm_dp_clock_recovery_ok(link_status, it6505->lane_count)) {
1707                         it6505_set_bits(it6505, REG_TRAIN_CTRL0, FORCE_CR_DONE,
1708                                         FORCE_CR_DONE);
1709                         return true;
1710                 }
1711                 DRM_DEV_DEBUG_DRIVER(it6505->dev, "cr not done");
1712
1713                 if (it6505_check_max_voltage_swing_reached(lane_level_config,
1714                                                            it6505->lane_count))
1715                         goto cr_train_fail;
1716
1717                 for (j = 0; j < it6505->lane_count; j++) {
1718                         lane_voltage_pre_emphasis->voltage_swing[j] =
1719                                 drm_dp_get_adjust_request_voltage(link_status,
1720                                                                   j) >>
1721                                 DP_TRAIN_VOLTAGE_SWING_SHIFT;
1722                         lane_voltage_pre_emphasis->pre_emphasis[j] =
1723                         drm_dp_get_adjust_request_pre_emphasis(link_status,
1724                                                                j) >>
1725                                         DP_TRAIN_PRE_EMPHASIS_SHIFT;
1726                         if (voltage_swing_adjust ==
1727                              lane_voltage_pre_emphasis->voltage_swing[j] &&
1728                             pre_emphasis_adjust ==
1729                              lane_voltage_pre_emphasis->pre_emphasis[j]) {
1730                                 loop_count++;
1731                                 continue;
1732                         }
1733
1734                         voltage_swing_adjust =
1735                                 lane_voltage_pre_emphasis->voltage_swing[j];
1736                         pre_emphasis_adjust =
1737                                 lane_voltage_pre_emphasis->pre_emphasis[j];
1738                         loop_count = 0;
1739
1740                         if (voltage_swing_adjust + pre_emphasis_adjust >
1741                             MAX_EQ_LEVEL)
1742                                 lane_voltage_pre_emphasis->voltage_swing[j] =
1743                                         MAX_EQ_LEVEL -
1744                                         lane_voltage_pre_emphasis
1745                                                 ->pre_emphasis[j];
1746                 }
1747         }
1748
1749 cr_train_fail:
1750         it6505_dpcd_write(it6505, DP_TRAINING_PATTERN_SET,
1751                           DP_TRAINING_PATTERN_DISABLE);
1752
1753         return false;
1754 }
1755
1756 static bool
1757 it6505_step_eq_train(struct it6505 *it6505,
1758                      struct it6505_step_train_para *lane_voltage_pre_emphasis)
1759 {
1760         u8 loop_count = 0, i, link_status[DP_LINK_STATUS_SIZE] = { 0 };
1761         u8 lane_level_config[MAX_LANE_COUNT] = { 0 };
1762         const struct drm_dp_aux *aux = &it6505->aux;
1763
1764         it6505_dpcd_write(it6505, DP_TRAINING_PATTERN_SET,
1765                           DP_TRAINING_PATTERN_2);
1766
1767         while (loop_count < 6) {
1768                 loop_count++;
1769
1770                 if (!step_train_lane_voltage_para_set(it6505,
1771                                                       lane_voltage_pre_emphasis,
1772                                                       lane_level_config))
1773                         continue;
1774
1775                 drm_dp_link_train_channel_eq_delay(aux, it6505->dpcd);
1776                 drm_dp_dpcd_read_link_status(&it6505->aux, link_status);
1777
1778                 if (!drm_dp_clock_recovery_ok(link_status, it6505->lane_count))
1779                         goto eq_train_fail;
1780
1781                 if (drm_dp_channel_eq_ok(link_status, it6505->lane_count)) {
1782                         it6505_dpcd_write(it6505, DP_TRAINING_PATTERN_SET,
1783                                           DP_TRAINING_PATTERN_DISABLE);
1784                         it6505_set_bits(it6505, REG_TRAIN_CTRL0, FORCE_EQ_DONE,
1785                                         FORCE_EQ_DONE);
1786                         return true;
1787                 }
1788                 DRM_DEV_DEBUG_DRIVER(it6505->dev, "eq not done");
1789
1790                 for (i = 0; i < it6505->lane_count; i++) {
1791                         lane_voltage_pre_emphasis->voltage_swing[i] =
1792                                 drm_dp_get_adjust_request_voltage(link_status,
1793                                                                   i) >>
1794                                 DP_TRAIN_VOLTAGE_SWING_SHIFT;
1795                         lane_voltage_pre_emphasis->pre_emphasis[i] =
1796                         drm_dp_get_adjust_request_pre_emphasis(link_status,
1797                                                                i) >>
1798                                         DP_TRAIN_PRE_EMPHASIS_SHIFT;
1799
1800                         if (lane_voltage_pre_emphasis->voltage_swing[i] +
1801                                     lane_voltage_pre_emphasis->pre_emphasis[i] >
1802                             MAX_EQ_LEVEL)
1803                                 lane_voltage_pre_emphasis->voltage_swing[i] =
1804                                         0x03 - lane_voltage_pre_emphasis
1805                                                        ->pre_emphasis[i];
1806                 }
1807         }
1808
1809 eq_train_fail:
1810         it6505_dpcd_write(it6505, DP_TRAINING_PATTERN_SET,
1811                           DP_TRAINING_PATTERN_DISABLE);
1812         return false;
1813 }
1814
1815 static bool it6505_link_start_step_train(struct it6505 *it6505)
1816 {
1817         int err;
1818         struct it6505_step_train_para lane_voltage_pre_emphasis = {
1819                 .voltage_swing = { 0 },
1820                 .pre_emphasis = { 0 },
1821         };
1822
1823         DRM_DEV_DEBUG_DRIVER(it6505->dev, "start");
1824         err = it6505_drm_dp_link_configure(it6505);
1825
1826         if (err < 0)
1827                 return false;
1828         if (!it6505_step_cr_train(it6505, &lane_voltage_pre_emphasis))
1829                 return false;
1830         if (!it6505_step_eq_train(it6505, &lane_voltage_pre_emphasis))
1831                 return false;
1832         return true;
1833 }
1834
1835 static bool it6505_get_video_status(struct it6505 *it6505)
1836 {
1837         int reg_0d;
1838
1839         reg_0d = it6505_read(it6505, REG_SYSTEM_STS);
1840
1841         if (reg_0d < 0)
1842                 return false;
1843
1844         return reg_0d & VIDEO_STB;
1845 }
1846
1847 static void it6505_reset_hdcp(struct it6505 *it6505)
1848 {
1849         it6505->hdcp_status = HDCP_AUTH_IDLE;
1850         /* Disable CP_Desired */
1851         it6505_set_bits(it6505, REG_HDCP_CTRL1, HDCP_CP_ENABLE, 0x00);
1852         it6505_set_bits(it6505, REG_RESET_CTRL, HDCP_RESET, HDCP_RESET);
1853 }
1854
1855 static void it6505_start_hdcp(struct it6505 *it6505)
1856 {
1857         struct device *dev = it6505->dev;
1858
1859         DRM_DEV_DEBUG_DRIVER(dev, "start");
1860         it6505_reset_hdcp(it6505);
1861         queue_delayed_work(system_wq, &it6505->hdcp_work,
1862                            msecs_to_jiffies(2400));
1863 }
1864
1865 static void it6505_stop_hdcp(struct it6505 *it6505)
1866 {
1867         it6505_reset_hdcp(it6505);
1868         cancel_delayed_work(&it6505->hdcp_work);
1869 }
1870
1871 static bool it6505_hdcp_is_ksv_valid(u8 *ksv)
1872 {
1873         int i, ones = 0;
1874
1875         /* KSV has 20 1's and 20 0's */
1876         for (i = 0; i < DRM_HDCP_KSV_LEN; i++)
1877                 ones += hweight8(ksv[i]);
1878         if (ones != 20)
1879                 return false;
1880         return true;
1881 }
1882
1883 static void it6505_hdcp_part1_auth(struct it6505 *it6505)
1884 {
1885         struct device *dev = it6505->dev;
1886         u8 hdcp_bcaps;
1887
1888         it6505_set_bits(it6505, REG_RESET_CTRL, HDCP_RESET, 0x00);
1889         /* Disable CP_Desired */
1890         it6505_set_bits(it6505, REG_HDCP_CTRL1, HDCP_CP_ENABLE, 0x00);
1891
1892         usleep_range(1000, 1500);
1893         hdcp_bcaps = it6505_dpcd_read(it6505, DP_AUX_HDCP_BCAPS);
1894         DRM_DEV_DEBUG_DRIVER(dev, "DPCD[0x68028]: 0x%02x",
1895                              hdcp_bcaps);
1896
1897         if (!hdcp_bcaps)
1898                 return;
1899
1900         /* clear the repeater List Chk Done and fail bit */
1901         it6505_set_bits(it6505, REG_HDCP_TRIGGER,
1902                         HDCP_TRIGGER_KSV_DONE | HDCP_TRIGGER_KSV_FAIL,
1903                         0x00);
1904
1905         /* Enable An Generator */
1906         it6505_set_bits(it6505, REG_HDCP_CTRL2, HDCP_AN_GEN, HDCP_AN_GEN);
1907         /* delay1ms(10);*/
1908         usleep_range(10000, 15000);
1909         /* Stop An Generator */
1910         it6505_set_bits(it6505, REG_HDCP_CTRL2, HDCP_AN_GEN, 0x00);
1911
1912         it6505_set_bits(it6505, REG_HDCP_CTRL1, HDCP_CP_ENABLE, HDCP_CP_ENABLE);
1913
1914         it6505_set_bits(it6505, REG_HDCP_TRIGGER, HDCP_TRIGGER_START,
1915                         HDCP_TRIGGER_START);
1916
1917         it6505->hdcp_status = HDCP_AUTH_GOING;
1918 }
1919
1920 static int it6505_sha1_digest(struct it6505 *it6505, u8 *sha1_input,
1921                               unsigned int size, u8 *output_av)
1922 {
1923         struct shash_desc *desc;
1924         struct crypto_shash *tfm;
1925         int err;
1926         struct device *dev = it6505->dev;
1927
1928         tfm = crypto_alloc_shash("sha1", 0, 0);
1929         if (IS_ERR(tfm)) {
1930                 dev_err(dev, "crypto_alloc_shash sha1 failed");
1931                 return PTR_ERR(tfm);
1932         }
1933         desc = kzalloc(sizeof(*desc) + crypto_shash_descsize(tfm), GFP_KERNEL);
1934         if (!desc) {
1935                 crypto_free_shash(tfm);
1936                 return -ENOMEM;
1937         }
1938
1939         desc->tfm = tfm;
1940         err = crypto_shash_digest(desc, sha1_input, size, output_av);
1941         if (err)
1942                 dev_err(dev, "crypto_shash_digest sha1 failed");
1943
1944         crypto_free_shash(tfm);
1945         kfree(desc);
1946         return err;
1947 }
1948
1949 static int it6505_setup_sha1_input(struct it6505 *it6505, u8 *sha1_input)
1950 {
1951         struct device *dev = it6505->dev;
1952         u8 binfo[2];
1953         int down_stream_count, i, err, msg_count = 0;
1954
1955         err = it6505_get_dpcd(it6505, DP_AUX_HDCP_BINFO, binfo,
1956                               ARRAY_SIZE(binfo));
1957
1958         if (err < 0) {
1959                 dev_err(dev, "Read binfo value Fail");
1960                 return err;
1961         }
1962
1963         down_stream_count = binfo[0] & 0x7F;
1964         DRM_DEV_DEBUG_DRIVER(dev, "binfo:0x%*ph", (int)ARRAY_SIZE(binfo),
1965                              binfo);
1966
1967         if ((binfo[0] & BIT(7)) || (binfo[1] & BIT(3))) {
1968                 dev_err(dev, "HDCP max cascade device exceed");
1969                 return 0;
1970         }
1971
1972         if (!down_stream_count ||
1973             down_stream_count > MAX_HDCP_DOWN_STREAM_COUNT) {
1974                 dev_err(dev, "HDCP down stream count Error %d",
1975                         down_stream_count);
1976                 return 0;
1977         }
1978
1979         for (i = 0; i < down_stream_count; i++) {
1980                 err = it6505_get_dpcd(it6505, DP_AUX_HDCP_KSV_FIFO +
1981                                       (i % 3) * DRM_HDCP_KSV_LEN,
1982                                       sha1_input + msg_count,
1983                                       DRM_HDCP_KSV_LEN);
1984
1985                 if (err < 0)
1986                         return err;
1987
1988                 msg_count += 5;
1989         }
1990
1991         it6505->hdcp_down_stream_count = down_stream_count;
1992         sha1_input[msg_count++] = binfo[0];
1993         sha1_input[msg_count++] = binfo[1];
1994
1995         it6505_set_bits(it6505, REG_HDCP_CTRL2, HDCP_EN_M0_READ,
1996                         HDCP_EN_M0_READ);
1997
1998         err = regmap_bulk_read(it6505->regmap, REG_M0_0_7,
1999                                sha1_input + msg_count, 8);
2000
2001         it6505_set_bits(it6505, REG_HDCP_CTRL2, HDCP_EN_M0_READ, 0x00);
2002
2003         if (err < 0) {
2004                 dev_err(dev, " Warning, Read M value Fail");
2005                 return err;
2006         }
2007
2008         msg_count += 8;
2009
2010         return msg_count;
2011 }
2012
2013 static bool it6505_hdcp_part2_ksvlist_check(struct it6505 *it6505)
2014 {
2015         struct device *dev = it6505->dev;
2016         u8 av[5][4], bv[5][4];
2017         int i, err;
2018
2019         i = it6505_setup_sha1_input(it6505, it6505->sha1_input);
2020         if (i <= 0) {
2021                 dev_err(dev, "SHA-1 Input length error %d", i);
2022                 return false;
2023         }
2024
2025         it6505_sha1_digest(it6505, it6505->sha1_input, i, (u8 *)av);
2026
2027         err = it6505_get_dpcd(it6505, DP_AUX_HDCP_V_PRIME(0), (u8 *)bv,
2028                               sizeof(bv));
2029
2030         if (err < 0) {
2031                 dev_err(dev, "Read V' value Fail");
2032                 return false;
2033         }
2034
2035         for (i = 0; i < 5; i++)
2036                 if (bv[i][3] != av[i][0] || bv[i][2] != av[i][1] ||
2037                     bv[i][1] != av[i][2] || bv[i][0] != av[i][3])
2038                         return false;
2039
2040         DRM_DEV_DEBUG_DRIVER(dev, "V' all match!!");
2041         return true;
2042 }
2043
2044 static void it6505_hdcp_wait_ksv_list(struct work_struct *work)
2045 {
2046         struct it6505 *it6505 = container_of(work, struct it6505,
2047                                              hdcp_wait_ksv_list);
2048         struct device *dev = it6505->dev;
2049         unsigned int timeout = 5000;
2050         u8 bstatus = 0;
2051         bool ksv_list_check;
2052
2053         timeout /= 20;
2054         while (timeout > 0) {
2055                 if (!it6505_get_sink_hpd_status(it6505))
2056                         return;
2057
2058                 bstatus = it6505_dpcd_read(it6505, DP_AUX_HDCP_BSTATUS);
2059
2060                 if (bstatus & DP_BSTATUS_READY)
2061                         break;
2062
2063                 msleep(20);
2064                 timeout--;
2065         }
2066
2067         if (timeout == 0) {
2068                 DRM_DEV_DEBUG_DRIVER(dev, "timeout and ksv list wait failed");
2069                 goto timeout;
2070         }
2071
2072         ksv_list_check = it6505_hdcp_part2_ksvlist_check(it6505);
2073         DRM_DEV_DEBUG_DRIVER(dev, "ksv list ready, ksv list check %s",
2074                              ksv_list_check ? "pass" : "fail");
2075         if (ksv_list_check) {
2076                 it6505_set_bits(it6505, REG_HDCP_TRIGGER,
2077                                 HDCP_TRIGGER_KSV_DONE, HDCP_TRIGGER_KSV_DONE);
2078                 return;
2079         }
2080 timeout:
2081         it6505_set_bits(it6505, REG_HDCP_TRIGGER,
2082                         HDCP_TRIGGER_KSV_DONE | HDCP_TRIGGER_KSV_FAIL,
2083                         HDCP_TRIGGER_KSV_DONE | HDCP_TRIGGER_KSV_FAIL);
2084 }
2085
2086 static void it6505_hdcp_work(struct work_struct *work)
2087 {
2088         struct it6505 *it6505 = container_of(work, struct it6505,
2089                                              hdcp_work.work);
2090         struct device *dev = it6505->dev;
2091         int ret;
2092         u8 link_status[DP_LINK_STATUS_SIZE] = { 0 };
2093
2094         DRM_DEV_DEBUG_DRIVER(dev, "start");
2095
2096         if (!it6505_get_sink_hpd_status(it6505))
2097                 return;
2098
2099         ret = drm_dp_dpcd_read_link_status(&it6505->aux, link_status);
2100         DRM_DEV_DEBUG_DRIVER(dev, "ret: %d link_status: %*ph", ret,
2101                              (int)sizeof(link_status), link_status);
2102
2103         if (ret < 0 || !drm_dp_channel_eq_ok(link_status, it6505->lane_count) ||
2104             !it6505_get_video_status(it6505)) {
2105                 DRM_DEV_DEBUG_DRIVER(dev, "link train not done or no video");
2106                 return;
2107         }
2108
2109         ret = it6505_get_dpcd(it6505, DP_AUX_HDCP_BKSV, it6505->bksvs,
2110                               ARRAY_SIZE(it6505->bksvs));
2111         if (ret < 0) {
2112                 dev_err(dev, "fail to get bksv  ret: %d", ret);
2113                 it6505_set_bits(it6505, REG_HDCP_TRIGGER,
2114                                 HDCP_TRIGGER_KSV_FAIL, HDCP_TRIGGER_KSV_FAIL);
2115         }
2116
2117         DRM_DEV_DEBUG_DRIVER(dev, "bksv = 0x%*ph",
2118                              (int)ARRAY_SIZE(it6505->bksvs), it6505->bksvs);
2119
2120         if (!it6505_hdcp_is_ksv_valid(it6505->bksvs)) {
2121                 dev_err(dev, "Display Port bksv not valid");
2122                 it6505_set_bits(it6505, REG_HDCP_TRIGGER,
2123                                 HDCP_TRIGGER_KSV_FAIL, HDCP_TRIGGER_KSV_FAIL);
2124         }
2125
2126         it6505_hdcp_part1_auth(it6505);
2127 }
2128
2129 static void it6505_show_hdcp_info(struct it6505 *it6505)
2130 {
2131         struct device *dev = it6505->dev;
2132         int i;
2133         u8 *sha1 = it6505->sha1_input;
2134
2135         DRM_DEV_DEBUG_DRIVER(dev, "hdcp_status: %d is_repeater: %d",
2136                              it6505->hdcp_status, it6505->is_repeater);
2137         DRM_DEV_DEBUG_DRIVER(dev, "bksv = 0x%*ph",
2138                              (int)ARRAY_SIZE(it6505->bksvs), it6505->bksvs);
2139
2140         if (it6505->is_repeater) {
2141                 DRM_DEV_DEBUG_DRIVER(dev, "hdcp_down_stream_count: %d",
2142                                      it6505->hdcp_down_stream_count);
2143                 DRM_DEV_DEBUG_DRIVER(dev, "sha1_input: 0x%*ph",
2144                                      (int)ARRAY_SIZE(it6505->sha1_input),
2145                                      it6505->sha1_input);
2146                 for (i = 0; i < it6505->hdcp_down_stream_count; i++) {
2147                         DRM_DEV_DEBUG_DRIVER(dev, "KSV_%d = 0x%*ph", i,
2148                                              DRM_HDCP_KSV_LEN, sha1);
2149                         sha1 += DRM_HDCP_KSV_LEN;
2150                 }
2151                 DRM_DEV_DEBUG_DRIVER(dev, "binfo: 0x%2ph M0: 0x%8ph",
2152                                      sha1, sha1 + 2);
2153         }
2154 }
2155
2156 static void it6505_stop_link_train(struct it6505 *it6505)
2157 {
2158         it6505->link_state = LINK_IDLE;
2159         cancel_work_sync(&it6505->link_works);
2160         it6505_write(it6505, REG_TRAIN_CTRL1, FORCE_RETRAIN);
2161 }
2162
2163 static void it6505_link_train_ok(struct it6505 *it6505)
2164 {
2165         struct device *dev = it6505->dev;
2166
2167         it6505->link_state = LINK_OK;
2168         /* disalbe mute enable avi info frame */
2169         it6505_set_bits(it6505, REG_DATA_MUTE_CTRL, EN_VID_MUTE, 0x00);
2170         it6505_set_bits(it6505, REG_INFOFRAME_CTRL,
2171                         EN_VID_CTRL_PKT, EN_VID_CTRL_PKT);
2172
2173         if (it6505_audio_input(it6505)) {
2174                 DRM_DEV_DEBUG_DRIVER(dev, "Enable audio!");
2175                 it6505_enable_audio(it6505);
2176         }
2177
2178         if (it6505->hdcp_desired)
2179                 it6505_start_hdcp(it6505);
2180 }
2181
2182 static void it6505_link_step_train_process(struct it6505 *it6505)
2183 {
2184         struct device *dev = it6505->dev;
2185         int ret, i, step_retry = 3;
2186
2187         DRM_DEV_DEBUG_DRIVER(dev, "Start step train");
2188
2189         if (it6505->sink_count == 0) {
2190                 DRM_DEV_DEBUG_DRIVER(dev, "it6505->sink_count:%d, force eq",
2191                                      it6505->sink_count);
2192                 it6505_set_bits(it6505, REG_TRAIN_CTRL0, FORCE_EQ_DONE,
2193                                 FORCE_EQ_DONE);
2194                 return;
2195         }
2196
2197         if (!it6505->step_train) {
2198                 DRM_DEV_DEBUG_DRIVER(dev, "not support step train");
2199                 return;
2200         }
2201
2202         /* step training start here */
2203         for (i = 0; i < step_retry; i++) {
2204                 it6505_link_reset_step_train(it6505);
2205                 ret = it6505_link_start_step_train(it6505);
2206                 DRM_DEV_DEBUG_DRIVER(dev, "step train %s, retry:%d times",
2207                                      ret ? "pass" : "failed", i + 1);
2208                 if (ret) {
2209                         it6505_link_train_ok(it6505);
2210                         return;
2211                 }
2212         }
2213
2214         DRM_DEV_DEBUG_DRIVER(dev, "training fail");
2215         it6505->link_state = LINK_IDLE;
2216         it6505_video_reset(it6505);
2217 }
2218
2219 static void it6505_link_training_work(struct work_struct *work)
2220 {
2221         struct it6505 *it6505 = container_of(work, struct it6505, link_works);
2222         struct device *dev = it6505->dev;
2223         int ret;
2224
2225         DRM_DEV_DEBUG_DRIVER(dev, "it6505->sink_count: %d",
2226                              it6505->sink_count);
2227
2228         if (!it6505_get_sink_hpd_status(it6505))
2229                 return;
2230
2231         it6505_link_training_setup(it6505);
2232         it6505_reset_hdcp(it6505);
2233         it6505_aux_reset(it6505);
2234
2235         if (it6505->auto_train_retry < 1) {
2236                 it6505_link_step_train_process(it6505);
2237                 return;
2238         }
2239
2240         ret = it6505_link_start_auto_train(it6505);
2241         DRM_DEV_DEBUG_DRIVER(dev, "auto train %s, auto_train_retry: %d",
2242                              ret ? "pass" : "failed", it6505->auto_train_retry);
2243         it6505->auto_train_retry--;
2244
2245         if (ret) {
2246                 it6505_link_train_ok(it6505);
2247                 return;
2248         }
2249
2250         it6505_dump(it6505);
2251 }
2252
2253 static void it6505_plugged_status_to_codec(struct it6505 *it6505)
2254 {
2255         enum drm_connector_status status = it6505->connector_status;
2256
2257         if (it6505->plugged_cb && it6505->codec_dev)
2258                 it6505->plugged_cb(it6505->codec_dev,
2259                                    status == connector_status_connected);
2260 }
2261
2262 static void it6505_remove_edid(struct it6505 *it6505)
2263 {
2264         kfree(it6505->cached_edid);
2265         it6505->cached_edid = NULL;
2266 }
2267
2268 static int it6505_process_hpd_irq(struct it6505 *it6505)
2269 {
2270         struct device *dev = it6505->dev;
2271         int ret, dpcd_sink_count, dp_irq_vector, bstatus;
2272         u8 link_status[DP_LINK_STATUS_SIZE];
2273
2274         if (!it6505_get_sink_hpd_status(it6505)) {
2275                 DRM_DEV_DEBUG_DRIVER(dev, "HPD_IRQ HPD low");
2276                 it6505->sink_count = 0;
2277                 return 0;
2278         }
2279
2280         ret = it6505_dpcd_read(it6505, DP_SINK_COUNT);
2281         if (ret < 0)
2282                 return ret;
2283
2284         dpcd_sink_count = DP_GET_SINK_COUNT(ret);
2285         DRM_DEV_DEBUG_DRIVER(dev, "dpcd_sink_count: %d it6505->sink_count:%d",
2286                              dpcd_sink_count, it6505->sink_count);
2287
2288         if (it6505->branch_device && dpcd_sink_count != it6505->sink_count) {
2289                 memset(it6505->dpcd, 0, sizeof(it6505->dpcd));
2290                 it6505->sink_count = dpcd_sink_count;
2291                 it6505_reset_logic(it6505);
2292                 it6505_int_mask_enable(it6505);
2293                 it6505_init(it6505);
2294                 it6505_remove_edid(it6505);
2295                 return 0;
2296         }
2297
2298         dp_irq_vector = it6505_dpcd_read(it6505, DP_DEVICE_SERVICE_IRQ_VECTOR);
2299         if (dp_irq_vector < 0)
2300                 return dp_irq_vector;
2301
2302         DRM_DEV_DEBUG_DRIVER(dev, "dp_irq_vector = 0x%02x", dp_irq_vector);
2303
2304         if (dp_irq_vector & DP_CP_IRQ) {
2305                 it6505_set_bits(it6505, REG_HDCP_TRIGGER, HDCP_TRIGGER_CPIRQ,
2306                                 HDCP_TRIGGER_CPIRQ);
2307
2308                 bstatus = it6505_dpcd_read(it6505, DP_AUX_HDCP_BSTATUS);
2309                 if (bstatus < 0)
2310                         return bstatus;
2311
2312                 DRM_DEV_DEBUG_DRIVER(dev, "Bstatus = 0x%02x", bstatus);
2313         }
2314
2315         ret = drm_dp_dpcd_read_link_status(&it6505->aux, link_status);
2316         if (ret < 0) {
2317                 dev_err(dev, "Fail to read link status ret: %d", ret);
2318                 return ret;
2319         }
2320
2321         DRM_DEV_DEBUG_DRIVER(dev, "link status = 0x%*ph",
2322                              (int)ARRAY_SIZE(link_status), link_status);
2323
2324         if (!drm_dp_channel_eq_ok(link_status, it6505->lane_count)) {
2325                 it6505->auto_train_retry = AUTO_TRAIN_RETRY;
2326                 it6505_video_reset(it6505);
2327         }
2328
2329         return 0;
2330 }
2331
2332 static void it6505_irq_hpd(struct it6505 *it6505)
2333 {
2334         struct device *dev = it6505->dev;
2335         int dp_sink_count;
2336
2337         it6505->hpd_state = it6505_get_sink_hpd_status(it6505);
2338         DRM_DEV_DEBUG_DRIVER(dev, "hpd change interrupt, change to %s",
2339                              it6505->hpd_state ? "high" : "low");
2340
2341         if (it6505->hpd_state) {
2342                 wait_for_completion_timeout(&it6505->extcon_completion,
2343                                             msecs_to_jiffies(1000));
2344                 it6505_aux_on(it6505);
2345                 if (it6505->dpcd[0] == 0) {
2346                         it6505_get_dpcd(it6505, DP_DPCD_REV, it6505->dpcd,
2347                                         ARRAY_SIZE(it6505->dpcd));
2348                         it6505_variable_config(it6505);
2349                         it6505_parse_link_capabilities(it6505);
2350                 }
2351                 it6505->auto_train_retry = AUTO_TRAIN_RETRY;
2352
2353                 it6505_drm_dp_link_set_power(&it6505->aux, &it6505->link,
2354                                              DP_SET_POWER_D0);
2355                 dp_sink_count = it6505_dpcd_read(it6505, DP_SINK_COUNT);
2356                 it6505->sink_count = DP_GET_SINK_COUNT(dp_sink_count);
2357
2358                 DRM_DEV_DEBUG_DRIVER(dev, "it6505->sink_count: %d",
2359                                      it6505->sink_count);
2360
2361                 it6505_lane_termination_on(it6505);
2362                 it6505_lane_power_on(it6505);
2363
2364                 /*
2365                  * for some dongle which issue HPD_irq
2366                  * when sink count change from  0->1
2367                  * it6505 not able to receive HPD_IRQ
2368                  * if HW never go into trainig done
2369                  */
2370
2371                 if (it6505->branch_device && it6505->sink_count == 0)
2372                         schedule_work(&it6505->link_works);
2373
2374                 if (!it6505_get_video_status(it6505))
2375                         it6505_video_reset(it6505);
2376         } else {
2377                 memset(it6505->dpcd, 0, sizeof(it6505->dpcd));
2378                 it6505_remove_edid(it6505);
2379
2380                 if (it6505->hdcp_desired)
2381                         it6505_stop_hdcp(it6505);
2382
2383                 it6505_video_disable(it6505);
2384                 it6505_disable_audio(it6505);
2385                 it6505_stop_link_train(it6505);
2386                 it6505_lane_off(it6505);
2387                 it6505_link_reset_step_train(it6505);
2388         }
2389
2390         if (it6505->bridge.dev)
2391                 drm_helper_hpd_irq_event(it6505->bridge.dev);
2392 }
2393
2394 static void it6505_irq_hpd_irq(struct it6505 *it6505)
2395 {
2396         struct device *dev = it6505->dev;
2397
2398         DRM_DEV_DEBUG_DRIVER(dev, "hpd_irq interrupt");
2399
2400         if (it6505_process_hpd_irq(it6505) < 0)
2401                 DRM_DEV_DEBUG_DRIVER(dev, "process hpd_irq fail!");
2402 }
2403
2404 static void it6505_irq_scdt(struct it6505 *it6505)
2405 {
2406         struct device *dev = it6505->dev;
2407         bool data;
2408
2409         data = it6505_get_video_status(it6505);
2410         DRM_DEV_DEBUG_DRIVER(dev, "video stable change interrupt, %s",
2411                              data ? "stable" : "unstable");
2412         it6505_calc_video_info(it6505);
2413         it6505_link_reset_step_train(it6505);
2414
2415         if (data)
2416                 schedule_work(&it6505->link_works);
2417 }
2418
2419 static void it6505_irq_hdcp_done(struct it6505 *it6505)
2420 {
2421         struct device *dev = it6505->dev;
2422
2423         DRM_DEV_DEBUG_DRIVER(dev, "hdcp done interrupt");
2424         it6505->hdcp_status = HDCP_AUTH_DONE;
2425         it6505_show_hdcp_info(it6505);
2426 }
2427
2428 static void it6505_irq_hdcp_fail(struct it6505 *it6505)
2429 {
2430         struct device *dev = it6505->dev;
2431
2432         DRM_DEV_DEBUG_DRIVER(dev, "hdcp fail interrupt");
2433         it6505->hdcp_status = HDCP_AUTH_IDLE;
2434         it6505_show_hdcp_info(it6505);
2435         it6505_start_hdcp(it6505);
2436 }
2437
2438 static void it6505_irq_aux_cmd_fail(struct it6505 *it6505)
2439 {
2440         struct device *dev = it6505->dev;
2441
2442         DRM_DEV_DEBUG_DRIVER(dev, "AUX PC Request Fail Interrupt");
2443 }
2444
2445 static void it6505_irq_hdcp_ksv_check(struct it6505 *it6505)
2446 {
2447         struct device *dev = it6505->dev;
2448
2449         DRM_DEV_DEBUG_DRIVER(dev, "HDCP event Interrupt");
2450         schedule_work(&it6505->hdcp_wait_ksv_list);
2451 }
2452
2453 static void it6505_irq_audio_fifo_error(struct it6505 *it6505)
2454 {
2455         struct device *dev = it6505->dev;
2456
2457         DRM_DEV_DEBUG_DRIVER(dev, "audio fifo error Interrupt");
2458
2459         if (it6505_audio_input(it6505))
2460                 it6505_enable_audio(it6505);
2461 }
2462
2463 static void it6505_irq_link_train_fail(struct it6505 *it6505)
2464 {
2465         struct device *dev = it6505->dev;
2466
2467         DRM_DEV_DEBUG_DRIVER(dev, "link training fail interrupt");
2468         schedule_work(&it6505->link_works);
2469 }
2470
2471 static void it6505_irq_video_fifo_error(struct it6505 *it6505)
2472 {
2473         struct device *dev = it6505->dev;
2474
2475         DRM_DEV_DEBUG_DRIVER(dev, "video fifo overflow interrupt");
2476         it6505->auto_train_retry = AUTO_TRAIN_RETRY;
2477         flush_work(&it6505->link_works);
2478         it6505_stop_hdcp(it6505);
2479         it6505_video_reset(it6505);
2480 }
2481
2482 static void it6505_irq_io_latch_fifo_overflow(struct it6505 *it6505)
2483 {
2484         struct device *dev = it6505->dev;
2485
2486         DRM_DEV_DEBUG_DRIVER(dev, "IO latch fifo overflow interrupt");
2487         it6505->auto_train_retry = AUTO_TRAIN_RETRY;
2488         flush_work(&it6505->link_works);
2489         it6505_stop_hdcp(it6505);
2490         it6505_video_reset(it6505);
2491 }
2492
2493 static bool it6505_test_bit(unsigned int bit, const unsigned int *addr)
2494 {
2495         return 1 & (addr[bit / BITS_PER_BYTE] >> (bit % BITS_PER_BYTE));
2496 }
2497
2498 static irqreturn_t it6505_int_threaded_handler(int unused, void *data)
2499 {
2500         struct it6505 *it6505 = data;
2501         struct device *dev = it6505->dev;
2502         static const struct {
2503                 int bit;
2504                 void (*handler)(struct it6505 *it6505);
2505         } irq_vec[] = {
2506                 { BIT_INT_HPD, it6505_irq_hpd },
2507                 { BIT_INT_HPD_IRQ, it6505_irq_hpd_irq },
2508                 { BIT_INT_SCDT, it6505_irq_scdt },
2509                 { BIT_INT_HDCP_FAIL, it6505_irq_hdcp_fail },
2510                 { BIT_INT_HDCP_DONE, it6505_irq_hdcp_done },
2511                 { BIT_INT_AUX_CMD_FAIL, it6505_irq_aux_cmd_fail },
2512                 { BIT_INT_HDCP_KSV_CHECK, it6505_irq_hdcp_ksv_check },
2513                 { BIT_INT_AUDIO_FIFO_ERROR, it6505_irq_audio_fifo_error },
2514                 { BIT_INT_LINK_TRAIN_FAIL, it6505_irq_link_train_fail },
2515                 { BIT_INT_VID_FIFO_ERROR, it6505_irq_video_fifo_error },
2516                 { BIT_INT_IO_FIFO_OVERFLOW, it6505_irq_io_latch_fifo_overflow },
2517         };
2518         int int_status[3], i;
2519
2520         if (it6505->enable_drv_hold || !it6505->powered)
2521                 return IRQ_HANDLED;
2522
2523         pm_runtime_get_sync(dev);
2524
2525         int_status[0] = it6505_read(it6505, INT_STATUS_01);
2526         int_status[1] = it6505_read(it6505, INT_STATUS_02);
2527         int_status[2] = it6505_read(it6505, INT_STATUS_03);
2528
2529         it6505_write(it6505, INT_STATUS_01, int_status[0]);
2530         it6505_write(it6505, INT_STATUS_02, int_status[1]);
2531         it6505_write(it6505, INT_STATUS_03, int_status[2]);
2532
2533         DRM_DEV_DEBUG_DRIVER(dev, "reg06 = 0x%02x", int_status[0]);
2534         DRM_DEV_DEBUG_DRIVER(dev, "reg07 = 0x%02x", int_status[1]);
2535         DRM_DEV_DEBUG_DRIVER(dev, "reg08 = 0x%02x", int_status[2]);
2536         it6505_debug_print(it6505, REG_SYSTEM_STS, "");
2537
2538         if (it6505_test_bit(irq_vec[0].bit, (unsigned int *)int_status))
2539                 irq_vec[0].handler(it6505);
2540
2541         if (it6505->hpd_state) {
2542                 for (i = 1; i < ARRAY_SIZE(irq_vec); i++) {
2543                         if (it6505_test_bit(irq_vec[i].bit, (unsigned int *)int_status))
2544                                 irq_vec[i].handler(it6505);
2545                 }
2546         }
2547
2548         pm_runtime_put_sync(dev);
2549
2550         return IRQ_HANDLED;
2551 }
2552
2553 static int it6505_poweron(struct it6505 *it6505)
2554 {
2555         struct device *dev = it6505->dev;
2556         struct it6505_platform_data *pdata = &it6505->pdata;
2557         int err;
2558
2559         DRM_DEV_DEBUG_DRIVER(dev, "it6505 start powered on");
2560
2561         if (it6505->powered) {
2562                 DRM_DEV_DEBUG_DRIVER(dev, "it6505 already powered on");
2563                 return 0;
2564         }
2565
2566         if (pdata->pwr18) {
2567                 err = regulator_enable(pdata->pwr18);
2568                 if (err) {
2569                         DRM_DEV_DEBUG_DRIVER(dev, "Failed to enable VDD18: %d",
2570                                              err);
2571                         return err;
2572                 }
2573         }
2574
2575         if (pdata->ovdd) {
2576                 /* time interval between IVDD and OVDD at least be 1ms */
2577                 usleep_range(1000, 2000);
2578                 err = regulator_enable(pdata->ovdd);
2579                 if (err) {
2580                         regulator_disable(pdata->pwr18);
2581                         return err;
2582                 }
2583         }
2584         /* time interval between OVDD and SYSRSTN at least be 10ms */
2585         if (pdata->gpiod_reset) {
2586                 usleep_range(10000, 20000);
2587                 gpiod_set_value_cansleep(pdata->gpiod_reset, 0);
2588                 usleep_range(1000, 2000);
2589                 gpiod_set_value_cansleep(pdata->gpiod_reset, 1);
2590                 usleep_range(10000, 20000);
2591         }
2592
2593         it6505->powered = true;
2594         it6505_reset_logic(it6505);
2595         it6505_int_mask_enable(it6505);
2596         it6505_init(it6505);
2597         it6505_lane_off(it6505);
2598
2599         return 0;
2600 }
2601
2602 static int it6505_poweroff(struct it6505 *it6505)
2603 {
2604         struct device *dev = it6505->dev;
2605         struct it6505_platform_data *pdata = &it6505->pdata;
2606         int err;
2607
2608         DRM_DEV_DEBUG_DRIVER(dev, "it6505 start power off");
2609
2610         if (!it6505->powered) {
2611                 DRM_DEV_DEBUG_DRIVER(dev, "power had been already off");
2612                 return 0;
2613         }
2614
2615         if (pdata->gpiod_reset)
2616                 gpiod_set_value_cansleep(pdata->gpiod_reset, 0);
2617
2618         if (pdata->pwr18) {
2619                 err = regulator_disable(pdata->pwr18);
2620                 if (err)
2621                         return err;
2622         }
2623
2624         if (pdata->ovdd) {
2625                 err = regulator_disable(pdata->ovdd);
2626                 if (err)
2627                         return err;
2628         }
2629
2630         it6505->powered = false;
2631         it6505->sink_count = 0;
2632
2633         return 0;
2634 }
2635
2636 static enum drm_connector_status it6505_detect(struct it6505 *it6505)
2637 {
2638         struct device *dev = it6505->dev;
2639         enum drm_connector_status status = connector_status_disconnected;
2640         int dp_sink_count;
2641
2642         DRM_DEV_DEBUG_DRIVER(dev, "it6505->sink_count:%d powered:%d",
2643                              it6505->sink_count, it6505->powered);
2644
2645         mutex_lock(&it6505->mode_lock);
2646
2647         if (!it6505->powered)
2648                 goto unlock;
2649
2650         if (it6505->enable_drv_hold) {
2651                 status = it6505->hpd_state ? connector_status_connected :
2652                                              connector_status_disconnected;
2653                 goto unlock;
2654         }
2655
2656         if (it6505->hpd_state) {
2657                 it6505_drm_dp_link_set_power(&it6505->aux, &it6505->link,
2658                                              DP_SET_POWER_D0);
2659                 dp_sink_count = it6505_dpcd_read(it6505, DP_SINK_COUNT);
2660                 it6505->sink_count = DP_GET_SINK_COUNT(dp_sink_count);
2661                 DRM_DEV_DEBUG_DRIVER(dev, "it6505->sink_count:%d branch:%d",
2662                                      it6505->sink_count, it6505->branch_device);
2663
2664                 if (it6505->branch_device) {
2665                         status = (it6505->sink_count != 0) ?
2666                                  connector_status_connected :
2667                                  connector_status_disconnected;
2668                 } else {
2669                         status = connector_status_connected;
2670                 }
2671         } else {
2672                 it6505->sink_count = 0;
2673                 memset(it6505->dpcd, 0, sizeof(it6505->dpcd));
2674         }
2675
2676 unlock:
2677         if (it6505->connector_status != status) {
2678                 it6505->connector_status = status;
2679                 it6505_plugged_status_to_codec(it6505);
2680         }
2681
2682         mutex_unlock(&it6505->mode_lock);
2683
2684         return status;
2685 }
2686
2687 static int it6505_extcon_notifier(struct notifier_block *self,
2688                                   unsigned long event, void *ptr)
2689 {
2690         struct it6505 *it6505 = container_of(self, struct it6505, event_nb);
2691
2692         schedule_work(&it6505->extcon_wq);
2693         return NOTIFY_DONE;
2694 }
2695
2696 static void it6505_extcon_work(struct work_struct *work)
2697 {
2698         struct it6505 *it6505 = container_of(work, struct it6505, extcon_wq);
2699         struct device *dev = it6505->dev;
2700         int state, ret;
2701
2702         if (it6505->enable_drv_hold)
2703                 return;
2704
2705         mutex_lock(&it6505->extcon_lock);
2706
2707         state = extcon_get_state(it6505->extcon, EXTCON_DISP_DP);
2708         DRM_DEV_DEBUG_DRIVER(dev, "EXTCON_DISP_DP = 0x%02x", state);
2709
2710         if (state == it6505->extcon_state || unlikely(state < 0))
2711                 goto unlock;
2712         it6505->extcon_state = state;
2713         if (state) {
2714                 DRM_DEV_DEBUG_DRIVER(dev, "start to power on");
2715                 msleep(100);
2716                 ret = pm_runtime_get_sync(dev);
2717
2718                 /*
2719                  * On system resume, extcon_work can be triggered before
2720                  * pm_runtime_force_resume re-enables runtime power management.
2721                  * Handling the error here to make sure the bridge is powered on.
2722                  */
2723                 if (ret < 0)
2724                         it6505_poweron(it6505);
2725
2726                 complete_all(&it6505->extcon_completion);
2727         } else {
2728                 DRM_DEV_DEBUG_DRIVER(dev, "start to power off");
2729                 pm_runtime_put_sync(dev);
2730                 reinit_completion(&it6505->extcon_completion);
2731
2732                 drm_helper_hpd_irq_event(it6505->bridge.dev);
2733                 memset(it6505->dpcd, 0, sizeof(it6505->dpcd));
2734                 DRM_DEV_DEBUG_DRIVER(dev, "power off it6505 success!");
2735         }
2736
2737 unlock:
2738         mutex_unlock(&it6505->extcon_lock);
2739 }
2740
2741 static int it6505_use_notifier_module(struct it6505 *it6505)
2742 {
2743         int ret;
2744         struct device *dev = it6505->dev;
2745
2746         it6505->event_nb.notifier_call = it6505_extcon_notifier;
2747         INIT_WORK(&it6505->extcon_wq, it6505_extcon_work);
2748         ret = devm_extcon_register_notifier(it6505->dev,
2749                                             it6505->extcon, EXTCON_DISP_DP,
2750                                             &it6505->event_nb);
2751         if (ret) {
2752                 dev_err(dev, "failed to register notifier for DP");
2753                 return ret;
2754         }
2755
2756         schedule_work(&it6505->extcon_wq);
2757
2758         return 0;
2759 }
2760
2761 static void it6505_remove_notifier_module(struct it6505 *it6505)
2762 {
2763         if (it6505->extcon) {
2764                 devm_extcon_unregister_notifier(it6505->dev,
2765                                                 it6505->extcon, EXTCON_DISP_DP,
2766                                                 &it6505->event_nb);
2767
2768                 flush_work(&it6505->extcon_wq);
2769         }
2770 }
2771
2772 static void __maybe_unused it6505_delayed_audio(struct work_struct *work)
2773 {
2774         struct it6505 *it6505 = container_of(work, struct it6505,
2775                                              delayed_audio.work);
2776
2777         DRM_DEV_DEBUG_DRIVER(it6505->dev, "start");
2778
2779         if (!it6505->powered)
2780                 return;
2781
2782         if (!it6505->enable_drv_hold)
2783                 it6505_enable_audio(it6505);
2784 }
2785
2786 static int __maybe_unused it6505_audio_setup_hw_params(struct it6505 *it6505,
2787                                                        struct hdmi_codec_params
2788                                                        *params)
2789 {
2790         struct device *dev = it6505->dev;
2791         int i = 0;
2792
2793         DRM_DEV_DEBUG_DRIVER(dev, "%s %d Hz, %d bit, %d channels\n", __func__,
2794                              params->sample_rate, params->sample_width,
2795                              params->cea.channels);
2796
2797         if (!it6505->bridge.encoder)
2798                 return -ENODEV;
2799
2800         if (params->cea.channels <= 1 || params->cea.channels > 8) {
2801                 DRM_DEV_DEBUG_DRIVER(dev, "channel number: %d not support",
2802                                      it6505->audio.channel_count);
2803                 return -EINVAL;
2804         }
2805
2806         it6505->audio.channel_count = params->cea.channels;
2807
2808         while (i < ARRAY_SIZE(audio_sample_rate_map) &&
2809                params->sample_rate !=
2810                        audio_sample_rate_map[i].sample_rate_value) {
2811                 i++;
2812         }
2813         if (i == ARRAY_SIZE(audio_sample_rate_map)) {
2814                 DRM_DEV_DEBUG_DRIVER(dev, "sample rate: %d Hz not support",
2815                                      params->sample_rate);
2816                 return -EINVAL;
2817         }
2818         it6505->audio.sample_rate = audio_sample_rate_map[i].rate;
2819
2820         switch (params->sample_width) {
2821         case 16:
2822                 it6505->audio.word_length = WORD_LENGTH_16BIT;
2823                 break;
2824         case 18:
2825                 it6505->audio.word_length = WORD_LENGTH_18BIT;
2826                 break;
2827         case 20:
2828                 it6505->audio.word_length = WORD_LENGTH_20BIT;
2829                 break;
2830         case 24:
2831         case 32:
2832                 it6505->audio.word_length = WORD_LENGTH_24BIT;
2833                 break;
2834         default:
2835                 DRM_DEV_DEBUG_DRIVER(dev, "wordlength: %d bit not support",
2836                                      params->sample_width);
2837                 return -EINVAL;
2838         }
2839
2840         return 0;
2841 }
2842
2843 static void __maybe_unused it6505_audio_shutdown(struct device *dev, void *data)
2844 {
2845         struct it6505 *it6505 = dev_get_drvdata(dev);
2846
2847         if (it6505->powered)
2848                 it6505_disable_audio(it6505);
2849 }
2850
2851 static int __maybe_unused it6505_audio_hook_plugged_cb(struct device *dev,
2852                                                        void *data,
2853                                                        hdmi_codec_plugged_cb fn,
2854                                                        struct device *codec_dev)
2855 {
2856         struct it6505 *it6505 = data;
2857
2858         it6505->plugged_cb = fn;
2859         it6505->codec_dev = codec_dev;
2860         it6505_plugged_status_to_codec(it6505);
2861
2862         return 0;
2863 }
2864
2865 static inline struct it6505 *bridge_to_it6505(struct drm_bridge *bridge)
2866 {
2867         return container_of(bridge, struct it6505, bridge);
2868 }
2869
2870 static int it6505_bridge_attach(struct drm_bridge *bridge,
2871                                 enum drm_bridge_attach_flags flags)
2872 {
2873         struct it6505 *it6505 = bridge_to_it6505(bridge);
2874         struct device *dev = it6505->dev;
2875         int ret;
2876
2877         if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
2878                 DRM_ERROR("DRM_BRIDGE_ATTACH_NO_CONNECTOR must be supplied");
2879                 return -EINVAL;
2880         }
2881
2882         if (!bridge->encoder) {
2883                 dev_err(dev, "Parent encoder object not found");
2884                 return -ENODEV;
2885         }
2886
2887         /* Register aux channel */
2888         it6505->aux.drm_dev = bridge->dev;
2889
2890         ret = drm_dp_aux_register(&it6505->aux);
2891
2892         if (ret < 0) {
2893                 dev_err(dev, "Failed to register aux: %d", ret);
2894                 return ret;
2895         }
2896
2897         if (it6505->extcon) {
2898                 ret = it6505_use_notifier_module(it6505);
2899                 if (ret < 0) {
2900                         dev_err(dev, "use notifier module failed");
2901                         return ret;
2902                 }
2903         }
2904
2905         return 0;
2906 }
2907
2908 static void it6505_bridge_detach(struct drm_bridge *bridge)
2909 {
2910         struct it6505 *it6505 = bridge_to_it6505(bridge);
2911
2912         flush_work(&it6505->link_works);
2913         it6505_remove_notifier_module(it6505);
2914 }
2915
2916 static enum drm_mode_status
2917 it6505_bridge_mode_valid(struct drm_bridge *bridge,
2918                          const struct drm_display_info *info,
2919                          const struct drm_display_mode *mode)
2920 {
2921         struct it6505 *it6505 = bridge_to_it6505(bridge);
2922
2923         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
2924                 return MODE_NO_INTERLACE;
2925
2926         if (mode->clock > it6505->max_dpi_pixel_clock)
2927                 return MODE_CLOCK_HIGH;
2928
2929         it6505->video_info.clock = mode->clock;
2930
2931         return MODE_OK;
2932 }
2933
2934 static void it6505_bridge_atomic_enable(struct drm_bridge *bridge,
2935                                         struct drm_bridge_state *old_state)
2936 {
2937         struct it6505 *it6505 = bridge_to_it6505(bridge);
2938         struct device *dev = it6505->dev;
2939         struct drm_atomic_state *state = old_state->base.state;
2940         struct hdmi_avi_infoframe frame;
2941         struct drm_crtc_state *crtc_state;
2942         struct drm_connector_state *conn_state;
2943         struct drm_display_mode *mode;
2944         struct drm_connector *connector;
2945         int ret;
2946
2947         DRM_DEV_DEBUG_DRIVER(dev, "start");
2948
2949         connector = drm_atomic_get_new_connector_for_encoder(state,
2950                                                              bridge->encoder);
2951
2952         if (WARN_ON(!connector))
2953                 return;
2954
2955         conn_state = drm_atomic_get_new_connector_state(state, connector);
2956
2957         if (WARN_ON(!conn_state))
2958                 return;
2959
2960         crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
2961
2962         if (WARN_ON(!crtc_state))
2963                 return;
2964
2965         mode = &crtc_state->adjusted_mode;
2966
2967         if (WARN_ON(!mode))
2968                 return;
2969
2970         ret = drm_hdmi_avi_infoframe_from_display_mode(&frame,
2971                                                        connector,
2972                                                        mode);
2973         if (ret)
2974                 dev_err(dev, "Failed to setup AVI infoframe: %d", ret);
2975
2976         it6505_update_video_parameter(it6505, mode);
2977
2978         ret = it6505_send_video_infoframe(it6505, &frame);
2979
2980         if (ret)
2981                 dev_err(dev, "Failed to send AVI infoframe: %d", ret);
2982
2983         it6505_int_mask_enable(it6505);
2984         it6505_video_reset(it6505);
2985
2986         it6505_drm_dp_link_set_power(&it6505->aux, &it6505->link,
2987                                      DP_SET_POWER_D0);
2988 }
2989
2990 static void it6505_bridge_atomic_disable(struct drm_bridge *bridge,
2991                                          struct drm_bridge_state *old_state)
2992 {
2993         struct it6505 *it6505 = bridge_to_it6505(bridge);
2994         struct device *dev = it6505->dev;
2995
2996         DRM_DEV_DEBUG_DRIVER(dev, "start");
2997
2998         if (it6505->powered) {
2999                 it6505_drm_dp_link_set_power(&it6505->aux, &it6505->link,
3000                                              DP_SET_POWER_D3);
3001                 it6505_video_disable(it6505);
3002         }
3003 }
3004
3005 static void it6505_bridge_atomic_pre_enable(struct drm_bridge *bridge,
3006                                             struct drm_bridge_state *old_state)
3007 {
3008         struct it6505 *it6505 = bridge_to_it6505(bridge);
3009         struct device *dev = it6505->dev;
3010
3011         DRM_DEV_DEBUG_DRIVER(dev, "start");
3012
3013         pm_runtime_get_sync(dev);
3014 }
3015
3016 static void it6505_bridge_atomic_post_disable(struct drm_bridge *bridge,
3017                                               struct drm_bridge_state *old_state)
3018 {
3019         struct it6505 *it6505 = bridge_to_it6505(bridge);
3020         struct device *dev = it6505->dev;
3021
3022         DRM_DEV_DEBUG_DRIVER(dev, "start");
3023
3024         pm_runtime_put_sync(dev);
3025 }
3026
3027 static enum drm_connector_status
3028 it6505_bridge_detect(struct drm_bridge *bridge)
3029 {
3030         struct it6505 *it6505 = bridge_to_it6505(bridge);
3031
3032         return it6505_detect(it6505);
3033 }
3034
3035 static struct edid *it6505_bridge_get_edid(struct drm_bridge *bridge,
3036                                            struct drm_connector *connector)
3037 {
3038         struct it6505 *it6505 = bridge_to_it6505(bridge);
3039         struct device *dev = it6505->dev;
3040
3041         if (!it6505->cached_edid) {
3042                 it6505->cached_edid = drm_do_get_edid(connector, it6505_get_edid_block,
3043                                                       it6505);
3044
3045                 if (!it6505->cached_edid) {
3046                         DRM_DEV_DEBUG_DRIVER(dev, "failed to get edid!");
3047                         return NULL;
3048                 }
3049         }
3050
3051         return drm_edid_duplicate(it6505->cached_edid);
3052 }
3053
3054 static const struct drm_bridge_funcs it6505_bridge_funcs = {
3055         .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
3056         .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
3057         .atomic_reset = drm_atomic_helper_bridge_reset,
3058         .attach = it6505_bridge_attach,
3059         .detach = it6505_bridge_detach,
3060         .mode_valid = it6505_bridge_mode_valid,
3061         .atomic_enable = it6505_bridge_atomic_enable,
3062         .atomic_disable = it6505_bridge_atomic_disable,
3063         .atomic_pre_enable = it6505_bridge_atomic_pre_enable,
3064         .atomic_post_disable = it6505_bridge_atomic_post_disable,
3065         .detect = it6505_bridge_detect,
3066         .get_edid = it6505_bridge_get_edid,
3067 };
3068
3069 static __maybe_unused int it6505_bridge_resume(struct device *dev)
3070 {
3071         struct it6505 *it6505 = dev_get_drvdata(dev);
3072
3073         return it6505_poweron(it6505);
3074 }
3075
3076 static __maybe_unused int it6505_bridge_suspend(struct device *dev)
3077 {
3078         struct it6505 *it6505 = dev_get_drvdata(dev);
3079
3080         return it6505_poweroff(it6505);
3081 }
3082
3083 static const struct dev_pm_ops it6505_bridge_pm_ops = {
3084         SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, pm_runtime_force_resume)
3085         SET_RUNTIME_PM_OPS(it6505_bridge_suspend, it6505_bridge_resume, NULL)
3086 };
3087
3088 static int it6505_init_pdata(struct it6505 *it6505)
3089 {
3090         struct it6505_platform_data *pdata = &it6505->pdata;
3091         struct device *dev = it6505->dev;
3092
3093         /* 1.0V digital core power regulator  */
3094         pdata->pwr18 = devm_regulator_get(dev, "pwr18");
3095         if (IS_ERR(pdata->pwr18)) {
3096                 dev_err(dev, "pwr18 regulator not found");
3097                 return PTR_ERR(pdata->pwr18);
3098         }
3099
3100         pdata->ovdd = devm_regulator_get(dev, "ovdd");
3101         if (IS_ERR(pdata->ovdd)) {
3102                 dev_err(dev, "ovdd regulator not found");
3103                 return PTR_ERR(pdata->ovdd);
3104         }
3105
3106         pdata->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
3107         if (IS_ERR(pdata->gpiod_reset)) {
3108                 dev_err(dev, "gpiod_reset gpio not found");
3109                 return PTR_ERR(pdata->gpiod_reset);
3110         }
3111
3112         return 0;
3113 }
3114
3115 static int it6505_get_data_lanes_count(const struct device_node *endpoint,
3116                                        const unsigned int min,
3117                                        const unsigned int max)
3118 {
3119         int ret;
3120
3121         ret = of_property_count_u32_elems(endpoint, "data-lanes");
3122         if (ret < 0)
3123                 return ret;
3124
3125         if (ret < min || ret > max)
3126                 return -EINVAL;
3127
3128         return ret;
3129 }
3130
3131 static void it6505_parse_dt(struct it6505 *it6505)
3132 {
3133         struct device *dev = it6505->dev;
3134         struct device_node *np = dev->of_node, *ep = NULL;
3135         int len;
3136         u64 link_frequencies;
3137         u32 data_lanes[4];
3138         u32 *afe_setting = &it6505->afe_setting;
3139         u32 *max_lane_count = &it6505->max_lane_count;
3140         u32 *max_dpi_pixel_clock = &it6505->max_dpi_pixel_clock;
3141
3142         it6505->lane_swap_disabled =
3143                 device_property_read_bool(dev, "no-laneswap");
3144
3145         if (it6505->lane_swap_disabled)
3146                 it6505->lane_swap = false;
3147
3148         if (device_property_read_u32(dev, "afe-setting", afe_setting) == 0) {
3149                 if (*afe_setting >= ARRAY_SIZE(afe_setting_table)) {
3150                         dev_err(dev, "afe setting error, use default");
3151                         *afe_setting = 0;
3152                 }
3153         } else {
3154                 *afe_setting = 0;
3155         }
3156
3157         ep = of_graph_get_endpoint_by_regs(np, 1, 0);
3158         of_node_put(ep);
3159
3160         if (ep) {
3161                 len = it6505_get_data_lanes_count(ep, 1, 4);
3162
3163                 if (len > 0 && len != 3) {
3164                         of_property_read_u32_array(ep, "data-lanes",
3165                                                    data_lanes, len);
3166                         *max_lane_count = len;
3167                 } else {
3168                         *max_lane_count = MAX_LANE_COUNT;
3169                         dev_err(dev, "error data-lanes, use default");
3170                 }
3171         } else {
3172                 *max_lane_count = MAX_LANE_COUNT;
3173                 dev_err(dev, "error endpoint, use default");
3174         }
3175
3176         ep = of_graph_get_endpoint_by_regs(np, 0, 0);
3177         of_node_put(ep);
3178
3179         if (ep) {
3180                 len = of_property_read_variable_u64_array(ep,
3181                                                           "link-frequencies",
3182                                                           &link_frequencies, 0,
3183                                                           1);
3184                 if (len >= 0) {
3185                         do_div(link_frequencies, 1000);
3186                         if (link_frequencies > 297000) {
3187                                 dev_err(dev,
3188                                         "max pixel clock error, use default");
3189                                 *max_dpi_pixel_clock = DPI_PIXEL_CLK_MAX;
3190                         } else {
3191                                 *max_dpi_pixel_clock = link_frequencies;
3192                         }
3193                 } else {
3194                         dev_err(dev, "error link frequencies, use default");
3195                         *max_dpi_pixel_clock = DPI_PIXEL_CLK_MAX;
3196                 }
3197         } else {
3198                 dev_err(dev, "error endpoint, use default");
3199                 *max_dpi_pixel_clock = DPI_PIXEL_CLK_MAX;
3200         }
3201
3202         DRM_DEV_DEBUG_DRIVER(dev, "using afe_setting: %u, max_lane_count: %u",
3203                              it6505->afe_setting, it6505->max_lane_count);
3204         DRM_DEV_DEBUG_DRIVER(dev, "using max_dpi_pixel_clock: %u kHz",
3205                              it6505->max_dpi_pixel_clock);
3206 }
3207
3208 static ssize_t receive_timing_debugfs_show(struct file *file, char __user *buf,
3209                                            size_t len, loff_t *ppos)
3210 {
3211         struct it6505 *it6505 = file->private_data;
3212         struct drm_display_mode *vid;
3213         u8 read_buf[READ_BUFFER_SIZE];
3214         u8 *str = read_buf, *end = read_buf + READ_BUFFER_SIZE;
3215         ssize_t ret, count;
3216
3217         if (!it6505)
3218                 return -ENODEV;
3219
3220         it6505_calc_video_info(it6505);
3221         vid = &it6505->video_info;
3222         str += scnprintf(str, end - str, "---video timing---\n");
3223         str += scnprintf(str, end - str, "PCLK:%d.%03dMHz\n",
3224                          vid->clock / 1000, vid->clock % 1000);
3225         str += scnprintf(str, end - str, "HTotal:%d\n", vid->htotal);
3226         str += scnprintf(str, end - str, "HActive:%d\n", vid->hdisplay);
3227         str += scnprintf(str, end - str, "HFrontPorch:%d\n",
3228                          vid->hsync_start - vid->hdisplay);
3229         str += scnprintf(str, end - str, "HSyncWidth:%d\n",
3230                          vid->hsync_end - vid->hsync_start);
3231         str += scnprintf(str, end - str, "HBackPorch:%d\n",
3232                          vid->htotal - vid->hsync_end);
3233         str += scnprintf(str, end - str, "VTotal:%d\n", vid->vtotal);
3234         str += scnprintf(str, end - str, "VActive:%d\n", vid->vdisplay);
3235         str += scnprintf(str, end - str, "VFrontPorch:%d\n",
3236                          vid->vsync_start - vid->vdisplay);
3237         str += scnprintf(str, end - str, "VSyncWidth:%d\n",
3238                          vid->vsync_end - vid->vsync_start);
3239         str += scnprintf(str, end - str, "VBackPorch:%d\n",
3240                          vid->vtotal - vid->vsync_end);
3241
3242         count = str - read_buf;
3243         ret = simple_read_from_buffer(buf, len, ppos, read_buf, count);
3244
3245         return ret;
3246 }
3247
3248 static int force_power_on_off_debugfs_write(void *data, u64 value)
3249 {
3250         struct it6505 *it6505 = data;
3251
3252         if (!it6505)
3253                 return -ENODEV;
3254
3255         if (value)
3256                 it6505_poweron(it6505);
3257         else
3258                 it6505_poweroff(it6505);
3259
3260         return 0;
3261 }
3262
3263 static int enable_drv_hold_debugfs_show(void *data, u64 *buf)
3264 {
3265         struct it6505 *it6505 = data;
3266
3267         if (!it6505)
3268                 return -ENODEV;
3269
3270         *buf = it6505->enable_drv_hold;
3271
3272         return 0;
3273 }
3274
3275 static int enable_drv_hold_debugfs_write(void *data, u64 drv_hold)
3276 {
3277         struct it6505 *it6505 = data;
3278
3279         if (!it6505)
3280                 return -ENODEV;
3281
3282         it6505->enable_drv_hold = drv_hold;
3283
3284         if (it6505->enable_drv_hold) {
3285                 it6505_int_mask_disable(it6505);
3286         } else {
3287                 it6505_clear_int(it6505);
3288                 it6505_int_mask_enable(it6505);
3289
3290                 if (it6505->powered) {
3291                         it6505->connector_status =
3292                                         it6505_get_sink_hpd_status(it6505) ?
3293                                         connector_status_connected :
3294                                         connector_status_disconnected;
3295                 } else {
3296                         it6505->connector_status =
3297                                         connector_status_disconnected;
3298                 }
3299         }
3300
3301         return 0;
3302 }
3303
3304 static const struct file_operations receive_timing_fops = {
3305         .owner = THIS_MODULE,
3306         .open = simple_open,
3307         .read = receive_timing_debugfs_show,
3308         .llseek = default_llseek,
3309 };
3310
3311 DEFINE_DEBUGFS_ATTRIBUTE(fops_force_power, NULL,
3312                          force_power_on_off_debugfs_write, "%llu\n");
3313
3314 DEFINE_DEBUGFS_ATTRIBUTE(fops_enable_drv_hold, enable_drv_hold_debugfs_show,
3315                          enable_drv_hold_debugfs_write, "%llu\n");
3316
3317 static const struct debugfs_entries debugfs_entry[] = {
3318         { "receive_timing", &receive_timing_fops },
3319         { "force_power_on_off", &fops_force_power },
3320         { "enable_drv_hold", &fops_enable_drv_hold },
3321         { NULL, NULL },
3322 };
3323
3324 static void debugfs_create_files(struct it6505 *it6505)
3325 {
3326         int i = 0;
3327
3328         while (debugfs_entry[i].name && debugfs_entry[i].fops) {
3329                 debugfs_create_file(debugfs_entry[i].name, 0644,
3330                                     it6505->debugfs, it6505,
3331                                     debugfs_entry[i].fops);
3332                 i++;
3333         }
3334 }
3335
3336 static void debugfs_init(struct it6505 *it6505)
3337 {
3338         struct device *dev = it6505->dev;
3339
3340         it6505->debugfs = debugfs_create_dir(DEBUGFS_DIR_NAME, NULL);
3341
3342         if (IS_ERR(it6505->debugfs)) {
3343                 dev_err(dev, "failed to create debugfs root");
3344                 return;
3345         }
3346
3347         debugfs_create_files(it6505);
3348 }
3349
3350 static void it6505_debugfs_remove(struct it6505 *it6505)
3351 {
3352         debugfs_remove_recursive(it6505->debugfs);
3353 }
3354
3355 static void it6505_shutdown(struct i2c_client *client)
3356 {
3357         struct it6505 *it6505 = dev_get_drvdata(&client->dev);
3358
3359         if (it6505->powered)
3360                 it6505_lane_off(it6505);
3361 }
3362
3363 static int it6505_i2c_probe(struct i2c_client *client)
3364 {
3365         struct it6505 *it6505;
3366         struct device *dev = &client->dev;
3367         struct extcon_dev *extcon;
3368         int err, intp_irq;
3369
3370         it6505 = devm_kzalloc(&client->dev, sizeof(*it6505), GFP_KERNEL);
3371         if (!it6505)
3372                 return -ENOMEM;
3373
3374         mutex_init(&it6505->extcon_lock);
3375         mutex_init(&it6505->mode_lock);
3376         mutex_init(&it6505->aux_lock);
3377
3378         it6505->bridge.of_node = client->dev.of_node;
3379         it6505->connector_status = connector_status_disconnected;
3380         it6505->dev = &client->dev;
3381         i2c_set_clientdata(client, it6505);
3382
3383         /* get extcon device from DTS */
3384         extcon = extcon_get_edev_by_phandle(dev, 0);
3385         if (PTR_ERR(extcon) == -EPROBE_DEFER)
3386                 return -EPROBE_DEFER;
3387         if (IS_ERR(extcon)) {
3388                 dev_err(dev, "can not get extcon device!");
3389                 return PTR_ERR(extcon);
3390         }
3391
3392         it6505->extcon = extcon;
3393
3394         it6505->regmap = devm_regmap_init_i2c(client, &it6505_regmap_config);
3395         if (IS_ERR(it6505->regmap)) {
3396                 dev_err(dev, "regmap i2c init failed");
3397                 err = PTR_ERR(it6505->regmap);
3398                 return err;
3399         }
3400
3401         err = it6505_init_pdata(it6505);
3402         if (err) {
3403                 dev_err(dev, "Failed to initialize pdata: %d", err);
3404                 return err;
3405         }
3406
3407         it6505_parse_dt(it6505);
3408
3409         intp_irq = client->irq;
3410
3411         if (!intp_irq) {
3412                 dev_err(dev, "Failed to get INTP IRQ");
3413                 err = -ENODEV;
3414                 return err;
3415         }
3416
3417         err = devm_request_threaded_irq(&client->dev, intp_irq, NULL,
3418                                         it6505_int_threaded_handler,
3419                                         IRQF_TRIGGER_LOW | IRQF_ONESHOT,
3420                                         "it6505-intp", it6505);
3421         if (err) {
3422                 dev_err(dev, "Failed to request INTP threaded IRQ: %d", err);
3423                 return err;
3424         }
3425
3426         INIT_WORK(&it6505->link_works, it6505_link_training_work);
3427         INIT_WORK(&it6505->hdcp_wait_ksv_list, it6505_hdcp_wait_ksv_list);
3428         INIT_DELAYED_WORK(&it6505->hdcp_work, it6505_hdcp_work);
3429         init_completion(&it6505->extcon_completion);
3430         memset(it6505->dpcd, 0, sizeof(it6505->dpcd));
3431         it6505->powered = false;
3432         it6505->enable_drv_hold = DEFAULT_DRV_HOLD;
3433
3434         if (DEFAULT_PWR_ON)
3435                 it6505_poweron(it6505);
3436
3437         DRM_DEV_DEBUG_DRIVER(dev, "it6505 device name: %s", dev_name(dev));
3438         debugfs_init(it6505);
3439         pm_runtime_enable(dev);
3440
3441         it6505->aux.name = "DP-AUX";
3442         it6505->aux.dev = dev;
3443         it6505->aux.transfer = it6505_aux_transfer;
3444         drm_dp_aux_init(&it6505->aux);
3445
3446         it6505->bridge.funcs = &it6505_bridge_funcs;
3447         it6505->bridge.type = DRM_MODE_CONNECTOR_DisplayPort;
3448         it6505->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID |
3449                              DRM_BRIDGE_OP_HPD;
3450         drm_bridge_add(&it6505->bridge);
3451
3452         return 0;
3453 }
3454
3455 static void it6505_i2c_remove(struct i2c_client *client)
3456 {
3457         struct it6505 *it6505 = i2c_get_clientdata(client);
3458
3459         drm_bridge_remove(&it6505->bridge);
3460         drm_dp_aux_unregister(&it6505->aux);
3461         it6505_debugfs_remove(it6505);
3462         it6505_poweroff(it6505);
3463         it6505_remove_edid(it6505);
3464 }
3465
3466 static const struct i2c_device_id it6505_id[] = {
3467         { "it6505", 0 },
3468         { }
3469 };
3470
3471 MODULE_DEVICE_TABLE(i2c, it6505_id);
3472
3473 static const struct of_device_id it6505_of_match[] = {
3474         { .compatible = "ite,it6505" },
3475         { }
3476 };
3477
3478 static struct i2c_driver it6505_i2c_driver = {
3479         .driver = {
3480                 .name = "it6505",
3481                 .of_match_table = it6505_of_match,
3482                 .pm = &it6505_bridge_pm_ops,
3483         },
3484         .probe = it6505_i2c_probe,
3485         .remove = it6505_i2c_remove,
3486         .shutdown = it6505_shutdown,
3487         .id_table = it6505_id,
3488 };
3489
3490 module_i2c_driver(it6505_i2c_driver);
3491
3492 MODULE_AUTHOR("Allen Chen <allen.chen@ite.com.tw>");
3493 MODULE_DESCRIPTION("IT6505 DisplayPort Transmitter driver");
3494 MODULE_LICENSE("GPL v2");