drivers/gpu/drm/exynos/exynos_dp_core.c

   1 /*
   2  * Samsung SoC DP (Display Port) interface driver.
   3  *
   4  * Copyright (C) 2012 Samsung Electronics Co., Ltd.
   5  * Author: Jingoo Han <jg1.han@samsung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2 of the License, or (at your
  10  * option) any later version.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/err.h>
  16 #include <linux/clk.h>
  17 #include <linux/io.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/delay.h>
  20 #include <linux/of.h>
  21 #include <linux/of_gpio.h>
  22 #include <linux/gpio.h>
  23 #include <linux/component.h>
  24 #include <linux/phy/phy.h>
  25 #include <video/of_display_timing.h>
  26 #include <video/of_videomode.h>
  27
  28 #include <drm/drmP.h>
  29 #include <drm/drm_crtc.h>
  30 #include <drm/drm_crtc_helper.h>
  31 #include <drm/bridge/ptn3460.h>
  32
  33 #include "exynos_drm_drv.h"
  34 #include "exynos_dp_core.h"
  35
  36 #define ctx_from_connector(c)   container_of(c, struct exynos_dp_device, \
  37                                         connector)
  38
  39 struct bridge_init {
  40         struct i2c_client *client;
  41         struct device_node *node;
  42 };
  43
  44 static int exynos_dp_init_dp(struct exynos_dp_device *dp)
  45 {
  46         exynos_dp_reset(dp);
  47
  48         exynos_dp_swreset(dp);
  49
  50         exynos_dp_init_analog_param(dp);
  51         exynos_dp_init_interrupt(dp);
  52
  53         /* SW defined function Normal operation */
  54         exynos_dp_enable_sw_function(dp);
  55
  56         exynos_dp_config_interrupt(dp);
  57         exynos_dp_init_analog_func(dp);
  58
  59         exynos_dp_init_hpd(dp);
  60         exynos_dp_init_aux(dp);
  61
  62         return 0;
  63 }
  64
  65 static int exynos_dp_detect_hpd(struct exynos_dp_device *dp)
  66 {
  67         int timeout_loop = 0;
  68
  69         while (exynos_dp_get_plug_in_status(dp) != 0) {
  70                 timeout_loop++;
  71                 if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) {
  72                         dev_err(dp->dev, "failed to get hpd plug status\n");
  73                         return -ETIMEDOUT;
  74                 }
  75                 usleep_range(10, 11);
  76         }
  77
  78         return 0;
  79 }
  80
  81 static unsigned char exynos_dp_calc_edid_check_sum(unsigned char *edid_data)
  82 {
  83         int i;
  84         unsigned char sum = 0;
  85
  86         for (i = 0; i < EDID_BLOCK_LENGTH; i++)
  87                 sum = sum + edid_data[i];
  88
  89         return sum;
  90 }
  91
  92 static int exynos_dp_read_edid(struct exynos_dp_device *dp)
  93 {
  94         unsigned char edid[EDID_BLOCK_LENGTH * 2];
  95         unsigned int extend_block = 0;
  96         unsigned char sum;
  97         unsigned char test_vector;
  98         int retval;
  99
 100         /*
 101          * EDID device address is 0x50.
 102          * However, if necessary, you must have set upper address
 103          * into E-EDID in I2C device, 0x30.
 104          */
 105
 106         /* Read Extension Flag, Number of 128-byte EDID extension blocks */
 107         retval = exynos_dp_read_byte_from_i2c(dp, I2C_EDID_DEVICE_ADDR,
 108                                 EDID_EXTENSION_FLAG,
 109                                 &extend_block);
 110         if (retval)
 111                 return retval;
 112
 113         if (extend_block > 0) {
 114                 dev_dbg(dp->dev, "EDID data includes a single extension!\n");
 115
 116                 /* Read EDID data */
 117                 retval = exynos_dp_read_bytes_from_i2c(dp, I2C_EDID_DEVICE_ADDR,
 118                                                 EDID_HEADER_PATTERN,
 119                                                 EDID_BLOCK_LENGTH,
 120                                                 &edid[EDID_HEADER_PATTERN]);
 121                 if (retval != 0) {
 122                         dev_err(dp->dev, "EDID Read failed!\n");
 123                         return -EIO;
 124                 }
 125                 sum = exynos_dp_calc_edid_check_sum(edid);
 126                 if (sum != 0) {
 127                         dev_err(dp->dev, "EDID bad checksum!\n");
 128                         return -EIO;
 129                 }
 130
 131                 /* Read additional EDID data */
 132                 retval = exynos_dp_read_bytes_from_i2c(dp,
 133                                 I2C_EDID_DEVICE_ADDR,
 134                                 EDID_BLOCK_LENGTH,
 135                                 EDID_BLOCK_LENGTH,
 136                                 &edid[EDID_BLOCK_LENGTH]);
 137                 if (retval != 0) {
 138                         dev_err(dp->dev, "EDID Read failed!\n");
 139                         return -EIO;
 140                 }
 141                 sum = exynos_dp_calc_edid_check_sum(&edid[EDID_BLOCK_LENGTH]);
 142                 if (sum != 0) {
 143                         dev_err(dp->dev, "EDID bad checksum!\n");
 144                         return -EIO;
 145                 }
 146
 147                 exynos_dp_read_byte_from_dpcd(dp, DP_TEST_REQUEST,
 148                                         &test_vector);
 149                 if (test_vector & DP_TEST_LINK_EDID_READ) {
 150                         exynos_dp_write_byte_to_dpcd(dp,
 151                                 DP_TEST_EDID_CHECKSUM,
 152                                 edid[EDID_BLOCK_LENGTH + EDID_CHECKSUM]);
 153                         exynos_dp_write_byte_to_dpcd(dp,
 154                                 DP_TEST_RESPONSE,
 155                                 DP_TEST_EDID_CHECKSUM_WRITE);
 156                 }
 157         } else {
 158                 dev_info(dp->dev, "EDID data does not include any extensions.\n");
 159
 160                 /* Read EDID data */
 161                 retval = exynos_dp_read_bytes_from_i2c(dp,
 162                                 I2C_EDID_DEVICE_ADDR,
 163                                 EDID_HEADER_PATTERN,
 164                                 EDID_BLOCK_LENGTH,
 165                                 &edid[EDID_HEADER_PATTERN]);
 166                 if (retval != 0) {
 167                         dev_err(dp->dev, "EDID Read failed!\n");
 168                         return -EIO;
 169                 }
 170                 sum = exynos_dp_calc_edid_check_sum(edid);
 171                 if (sum != 0) {
 172                         dev_err(dp->dev, "EDID bad checksum!\n");
 173                         return -EIO;
 174                 }
 175
 176                 exynos_dp_read_byte_from_dpcd(dp,
 177                         DP_TEST_REQUEST,
 178                         &test_vector);
 179                 if (test_vector & DP_TEST_LINK_EDID_READ) {
 180                         exynos_dp_write_byte_to_dpcd(dp,
 181                                 DP_TEST_EDID_CHECKSUM,
 182                                 edid[EDID_CHECKSUM]);
 183                         exynos_dp_write_byte_to_dpcd(dp,
 184                                 DP_TEST_RESPONSE,
 185                                 DP_TEST_EDID_CHECKSUM_WRITE);
 186                 }
 187         }
 188
 189         dev_err(dp->dev, "EDID Read success!\n");
 190         return 0;
 191 }
 192
 193 static int exynos_dp_handle_edid(struct exynos_dp_device *dp)
 194 {
 195         u8 buf[12];
 196         int i;
 197         int retval;
 198
 199         /* Read DPCD DP_DPCD_REV~RECEIVE_PORT1_CAP_1 */
 200         retval = exynos_dp_read_bytes_from_dpcd(dp, DP_DPCD_REV,
 201                                 12, buf);
 202         if (retval)
 203                 return retval;
 204
 205         /* Read EDID */
 206         for (i = 0; i < 3; i++) {
 207                 retval = exynos_dp_read_edid(dp);
 208                 if (!retval)
 209                         break;
 210         }
 211
 212         return retval;
 213 }
 214
 215 static void exynos_dp_enable_rx_to_enhanced_mode(struct exynos_dp_device *dp,
 216                                                 bool enable)
 217 {
 218         u8 data;
 219
 220         exynos_dp_read_byte_from_dpcd(dp, DP_LANE_COUNT_SET, &data);
 221
 222         if (enable)
 223                 exynos_dp_write_byte_to_dpcd(dp, DP_LANE_COUNT_SET,
 224                         DP_LANE_COUNT_ENHANCED_FRAME_EN |
 225                         DPCD_LANE_COUNT_SET(data));
 226         else
 227                 exynos_dp_write_byte_to_dpcd(dp, DP_LANE_COUNT_SET,
 228                         DPCD_LANE_COUNT_SET(data));
 229 }
 230
 231 static int exynos_dp_is_enhanced_mode_available(struct exynos_dp_device *dp)
 232 {
 233         u8 data;
 234         int retval;
 235
 236         exynos_dp_read_byte_from_dpcd(dp, DP_MAX_LANE_COUNT, &data);
 237         retval = DPCD_ENHANCED_FRAME_CAP(data);
 238
 239         return retval;
 240 }
 241
 242 static void exynos_dp_set_enhanced_mode(struct exynos_dp_device *dp)
 243 {
 244         u8 data;
 245
 246         data = exynos_dp_is_enhanced_mode_available(dp);
 247         exynos_dp_enable_rx_to_enhanced_mode(dp, data);
 248         exynos_dp_enable_enhanced_mode(dp, data);
 249 }
 250
 251 static void exynos_dp_training_pattern_dis(struct exynos_dp_device *dp)
 252 {
 253         exynos_dp_set_training_pattern(dp, DP_NONE);
 254
 255         exynos_dp_write_byte_to_dpcd(dp,
 256                 DP_TRAINING_PATTERN_SET,
 257                 DP_TRAINING_PATTERN_DISABLE);
 258 }
 259
 260 static void exynos_dp_set_lane_lane_pre_emphasis(struct exynos_dp_device *dp,
 261                                         int pre_emphasis, int lane)
 262 {
 263         switch (lane) {
 264         case 0:
 265                 exynos_dp_set_lane0_pre_emphasis(dp, pre_emphasis);
 266                 break;
 267         case 1:
 268                 exynos_dp_set_lane1_pre_emphasis(dp, pre_emphasis);
 269                 break;
 270
 271         case 2:
 272                 exynos_dp_set_lane2_pre_emphasis(dp, pre_emphasis);
 273                 break;
 274
 275         case 3:
 276                 exynos_dp_set_lane3_pre_emphasis(dp, pre_emphasis);
 277                 break;
 278         }
 279 }
 280
 281 static int exynos_dp_link_start(struct exynos_dp_device *dp)
 282 {
 283         u8 buf[4];
 284         int lane, lane_count, pll_tries, retval;
 285
 286         lane_count = dp->link_train.lane_count;
 287
 288         dp->link_train.lt_state = CLOCK_RECOVERY;
 289         dp->link_train.eq_loop = 0;
 290
 291         for (lane = 0; lane < lane_count; lane++)
 292                 dp->link_train.cr_loop[lane] = 0;
 293
 294         /* Set link rate and count as you want to establish*/
 295         exynos_dp_set_link_bandwidth(dp, dp->link_train.link_rate);
 296         exynos_dp_set_lane_count(dp, dp->link_train.lane_count);
 297
 298         /* Setup RX configuration */
 299         buf[0] = dp->link_train.link_rate;
 300         buf[1] = dp->link_train.lane_count;
 301         retval = exynos_dp_write_bytes_to_dpcd(dp, DP_LINK_BW_SET,
 302                                 2, buf);
 303         if (retval)
 304                 return retval;
 305
 306         /* Set TX pre-emphasis to minimum */
 307         for (lane = 0; lane < lane_count; lane++)
 308                 exynos_dp_set_lane_lane_pre_emphasis(dp,
 309                         PRE_EMPHASIS_LEVEL_0, lane);
 310
 311         /* Wait for PLL lock */
 312         pll_tries = 0;
 313         while (exynos_dp_get_pll_lock_status(dp) == PLL_UNLOCKED) {
 314                 if (pll_tries == DP_TIMEOUT_LOOP_COUNT) {
 315                         dev_err(dp->dev, "Wait for PLL lock timed out\n");
 316                         return -ETIMEDOUT;
 317                 }
 318
 319                 pll_tries++;
 320                 usleep_range(90, 120);
 321         }
 322
 323         /* Set training pattern 1 */
 324         exynos_dp_set_training_pattern(dp, TRAINING_PTN1);
 325
 326         /* Set RX training pattern */
 327         retval = exynos_dp_write_byte_to_dpcd(dp,
 328                         DP_TRAINING_PATTERN_SET,
 329                         DP_LINK_SCRAMBLING_DISABLE | DP_TRAINING_PATTERN_1);
 330         if (retval)
 331                 return retval;
 332
 333         for (lane = 0; lane < lane_count; lane++)
 334                 buf[lane] = DP_TRAIN_PRE_EMPHASIS_0 |
 335                             DP_TRAIN_VOLTAGE_SWING_400;
 336
 337         retval = exynos_dp_write_bytes_to_dpcd(dp, DP_TRAINING_LANE0_SET,
 338                         lane_count, buf);
 339
 340         return retval;
 341 }
 342
 343 static unsigned char exynos_dp_get_lane_status(u8 link_status[2], int lane)
 344 {
 345         int shift = (lane & 1) * 4;
 346         u8 link_value = link_status[lane>>1];
 347
 348         return (link_value >> shift) & 0xf;
 349 }
 350
 351 static int exynos_dp_clock_recovery_ok(u8 link_status[2], int lane_count)
 352 {
 353         int lane;
 354         u8 lane_status;
 355
 356         for (lane = 0; lane < lane_count; lane++) {
 357                 lane_status = exynos_dp_get_lane_status(link_status, lane);
 358                 if ((lane_status & DP_LANE_CR_DONE) == 0)
 359                         return -EINVAL;
 360         }
 361         return 0;
 362 }
 363
 364 static int exynos_dp_channel_eq_ok(u8 link_status[2], u8 link_align,
 365                                 int lane_count)
 366 {
 367         int lane;
 368         u8 lane_status;
 369
 370         if ((link_align & DP_INTERLANE_ALIGN_DONE) == 0)
 371                 return -EINVAL;
 372
 373         for (lane = 0; lane < lane_count; lane++) {
 374                 lane_status = exynos_dp_get_lane_status(link_status, lane);
 375                 lane_status &= DP_CHANNEL_EQ_BITS;
 376                 if (lane_status != DP_CHANNEL_EQ_BITS)
 377                         return -EINVAL;
 378         }
 379
 380         return 0;
 381 }
 382
 383 static unsigned char exynos_dp_get_adjust_request_voltage(u8 adjust_request[2],
 384                                                         int lane)
 385 {
 386         int shift = (lane & 1) * 4;
 387         u8 link_value = adjust_request[lane>>1];
 388
 389         return (link_value >> shift) & 0x3;
 390 }
 391
 392 static unsigned char exynos_dp_get_adjust_request_pre_emphasis(
 393                                         u8 adjust_request[2],
 394                                         int lane)
 395 {
 396         int shift = (lane & 1) * 4;
 397         u8 link_value = adjust_request[lane>>1];
 398
 399         return ((link_value >> shift) & 0xc) >> 2;
 400 }
 401
 402 static void exynos_dp_set_lane_link_training(struct exynos_dp_device *dp,
 403                                         u8 training_lane_set, int lane)
 404 {
 405         switch (lane) {
 406         case 0:
 407                 exynos_dp_set_lane0_link_training(dp, training_lane_set);
 408                 break;
 409         case 1:
 410                 exynos_dp_set_lane1_link_training(dp, training_lane_set);
 411                 break;
 412
 413         case 2:
 414                 exynos_dp_set_lane2_link_training(dp, training_lane_set);
 415                 break;
 416
 417         case 3:
 418                 exynos_dp_set_lane3_link_training(dp, training_lane_set);
 419                 break;
 420         }
 421 }
 422
 423 static unsigned int exynos_dp_get_lane_link_training(
 424                                 struct exynos_dp_device *dp,
 425                                 int lane)
 426 {
 427         u32 reg;
 428
 429         switch (lane) {
 430         case 0:
 431                 reg = exynos_dp_get_lane0_link_training(dp);
 432                 break;
 433         case 1:
 434                 reg = exynos_dp_get_lane1_link_training(dp);
 435                 break;
 436         case 2:
 437                 reg = exynos_dp_get_lane2_link_training(dp);
 438                 break;
 439         case 3:
 440                 reg = exynos_dp_get_lane3_link_training(dp);
 441                 break;
 442         default:
 443                 WARN_ON(1);
 444                 return 0;
 445         }
 446
 447         return reg;
 448 }
 449
 450 static void exynos_dp_reduce_link_rate(struct exynos_dp_device *dp)
 451 {
 452         exynos_dp_training_pattern_dis(dp);
 453         exynos_dp_set_enhanced_mode(dp);
 454
 455         dp->link_train.lt_state = FAILED;
 456 }
 457
 458 static void exynos_dp_get_adjust_training_lane(struct exynos_dp_device *dp,
 459                                         u8 adjust_request[2])
 460 {
 461         int lane, lane_count;
 462         u8 voltage_swing, pre_emphasis, training_lane;
 463
 464         lane_count = dp->link_train.lane_count;
 465         for (lane = 0; lane < lane_count; lane++) {
 466                 voltage_swing = exynos_dp_get_adjust_request_voltage(
 467                                                 adjust_request, lane);
 468                 pre_emphasis = exynos_dp_get_adjust_request_pre_emphasis(
 469                                                 adjust_request, lane);
 470                 training_lane = DPCD_VOLTAGE_SWING_SET(voltage_swing) |
 471                                 DPCD_PRE_EMPHASIS_SET(pre_emphasis);
 472
 473                 if (voltage_swing == VOLTAGE_LEVEL_3)
 474                         training_lane |= DP_TRAIN_MAX_SWING_REACHED;
 475                 if (pre_emphasis == PRE_EMPHASIS_LEVEL_3)
 476                         training_lane |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
 477
 478                 dp->link_train.training_lane[lane] = training_lane;
 479         }
 480 }
 481
 482 static int exynos_dp_process_clock_recovery(struct exynos_dp_device *dp)
 483 {
 484         int lane, lane_count, retval;
 485         u8 voltage_swing, pre_emphasis, training_lane;
 486         u8 link_status[2], adjust_request[2];
 487
 488         usleep_range(100, 101);
 489
 490         lane_count = dp->link_train.lane_count;
 491
 492         retval =  exynos_dp_read_bytes_from_dpcd(dp,
 493                         DP_LANE0_1_STATUS, 2, link_status);
 494         if (retval)
 495                 return retval;
 496
 497         retval =  exynos_dp_read_bytes_from_dpcd(dp,
 498                         DP_ADJUST_REQUEST_LANE0_1, 2, adjust_request);
 499         if (retval)
 500                 return retval;
 501
 502         if (exynos_dp_clock_recovery_ok(link_status, lane_count) == 0) {
 503                 /* set training pattern 2 for EQ */
 504                 exynos_dp_set_training_pattern(dp, TRAINING_PTN2);
 505
 506                 retval = exynos_dp_write_byte_to_dpcd(dp,
 507                                 DP_TRAINING_PATTERN_SET,
 508                                 DP_LINK_SCRAMBLING_DISABLE |
 509                                 DP_TRAINING_PATTERN_2);
 510                 if (retval)
 511                         return retval;
 512
 513                 dev_info(dp->dev, "Link Training Clock Recovery success\n");
 514                 dp->link_train.lt_state = EQUALIZER_TRAINING;
 515         } else {
 516                 for (lane = 0; lane < lane_count; lane++) {
 517                         training_lane = exynos_dp_get_lane_link_training(
 518                                                         dp, lane);
 519                         voltage_swing = exynos_dp_get_adjust_request_voltage(
 520                                                         adjust_request, lane);
 521                         pre_emphasis = exynos_dp_get_adjust_request_pre_emphasis(
 522                                                         adjust_request, lane);
 523
 524                         if (DPCD_VOLTAGE_SWING_GET(training_lane) ==
 525                                         voltage_swing &&
 526                             DPCD_PRE_EMPHASIS_GET(training_lane) ==
 527                                         pre_emphasis)
 528                                 dp->link_train.cr_loop[lane]++;
 529
 530                         if (dp->link_train.cr_loop[lane] == MAX_CR_LOOP ||
 531                             voltage_swing == VOLTAGE_LEVEL_3 ||
 532                             pre_emphasis == PRE_EMPHASIS_LEVEL_3) {
 533                                 dev_err(dp->dev, "CR Max reached (%d,%d,%d)\n",
 534                                         dp->link_train.cr_loop[lane],
 535                                         voltage_swing, pre_emphasis);
 536                                 exynos_dp_reduce_link_rate(dp);
 537                                 return -EIO;
 538                         }
 539                 }
 540         }
 541
 542         exynos_dp_get_adjust_training_lane(dp, adjust_request);
 543
 544         for (lane = 0; lane < lane_count; lane++)
 545                 exynos_dp_set_lane_link_training(dp,
 546                         dp->link_train.training_lane[lane], lane);
 547
 548         retval = exynos_dp_write_bytes_to_dpcd(dp,
 549                         DP_TRAINING_LANE0_SET, lane_count,
 550                         dp->link_train.training_lane);
 551         if (retval)
 552                 return retval;
 553
 554         return retval;
 555 }
 556
 557 static int exynos_dp_process_equalizer_training(struct exynos_dp_device *dp)
 558 {
 559         int lane, lane_count, retval;
 560         u32 reg;
 561         u8 link_align, link_status[2], adjust_request[2];
 562
 563         usleep_range(400, 401);
 564
 565         lane_count = dp->link_train.lane_count;
 566
 567         retval = exynos_dp_read_bytes_from_dpcd(dp,
 568                         DP_LANE0_1_STATUS, 2, link_status);
 569         if (retval)
 570                 return retval;
 571
 572         if (exynos_dp_clock_recovery_ok(link_status, lane_count)) {
 573                 exynos_dp_reduce_link_rate(dp);
 574                 return -EIO;
 575         }
 576
 577         retval = exynos_dp_read_bytes_from_dpcd(dp,
 578                         DP_ADJUST_REQUEST_LANE0_1, 2, adjust_request);
 579         if (retval)
 580                 return retval;
 581
 582         retval = exynos_dp_read_byte_from_dpcd(dp,
 583                         DP_LANE_ALIGN_STATUS_UPDATED, &link_align);
 584         if (retval)
 585                 return retval;
 586
 587         exynos_dp_get_adjust_training_lane(dp, adjust_request);
 588
 589         if (!exynos_dp_channel_eq_ok(link_status, link_align, lane_count)) {
 590                 /* traing pattern Set to Normal */
 591                 exynos_dp_training_pattern_dis(dp);
 592
 593                 dev_info(dp->dev, "Link Training success!\n");
 594
 595                 exynos_dp_get_link_bandwidth(dp, &reg);
 596                 dp->link_train.link_rate = reg;
 597                 dev_dbg(dp->dev, "final bandwidth = %.2x\n",
 598                         dp->link_train.link_rate);
 599
 600                 exynos_dp_get_lane_count(dp, &reg);
 601                 dp->link_train.lane_count = reg;
 602                 dev_dbg(dp->dev, "final lane count = %.2x\n",
 603                         dp->link_train.lane_count);
 604
 605                 /* set enhanced mode if available */
 606                 exynos_dp_set_enhanced_mode(dp);
 607                 dp->link_train.lt_state = FINISHED;
 608
 609                 return 0;
 610         }
 611
 612         /* not all locked */
 613         dp->link_train.eq_loop++;
 614
 615         if (dp->link_train.eq_loop > MAX_EQ_LOOP) {
 616                 dev_err(dp->dev, "EQ Max loop\n");
 617                 exynos_dp_reduce_link_rate(dp);
 618                 return -EIO;
 619         }
 620
 621         for (lane = 0; lane < lane_count; lane++)
 622                 exynos_dp_set_lane_link_training(dp,
 623                         dp->link_train.training_lane[lane], lane);
 624
 625         retval = exynos_dp_write_bytes_to_dpcd(dp, DP_TRAINING_LANE0_SET,
 626                         lane_count, dp->link_train.training_lane);
 627
 628         return retval;
 629 }
 630
 631 static void exynos_dp_get_max_rx_bandwidth(struct exynos_dp_device *dp,
 632                                         u8 *bandwidth)
 633 {
 634         u8 data;
 635
 636         /*
 637          * For DP rev.1.1, Maximum link rate of Main Link lanes
 638          * 0x06 = 1.62 Gbps, 0x0a = 2.7 Gbps
 639          */
 640         exynos_dp_read_byte_from_dpcd(dp, DP_MAX_LINK_RATE, &data);
 641         *bandwidth = data;
 642 }
 643
 644 static void exynos_dp_get_max_rx_lane_count(struct exynos_dp_device *dp,
 645                                         u8 *lane_count)
 646 {
 647         u8 data;
 648
 649         /*
 650          * For DP rev.1.1, Maximum number of Main Link lanes
 651          * 0x01 = 1 lane, 0x02 = 2 lanes, 0x04 = 4 lanes
 652          */
 653         exynos_dp_read_byte_from_dpcd(dp, DP_MAX_LANE_COUNT, &data);
 654         *lane_count = DPCD_MAX_LANE_COUNT(data);
 655 }
 656
 657 static void exynos_dp_init_training(struct exynos_dp_device *dp,
 658                         enum link_lane_count_type max_lane,
 659                         enum link_rate_type max_rate)
 660 {
 661         /*
 662          * MACRO_RST must be applied after the PLL_LOCK to avoid
 663          * the DP inter pair skew issue for at least 10 us
 664          */
 665         exynos_dp_reset_macro(dp);
 666
 667         /* Initialize by reading RX's DPCD */
 668         exynos_dp_get_max_rx_bandwidth(dp, &dp->link_train.link_rate);
 669         exynos_dp_get_max_rx_lane_count(dp, &dp->link_train.lane_count);
 670
 671         if ((dp->link_train.link_rate != LINK_RATE_1_62GBPS) &&
 672            (dp->link_train.link_rate != LINK_RATE_2_70GBPS)) {
 673                 dev_err(dp->dev, "Rx Max Link Rate is abnormal :%x !\n",
 674                         dp->link_train.link_rate);
 675                 dp->link_train.link_rate = LINK_RATE_1_62GBPS;
 676         }
 677
 678         if (dp->link_train.lane_count == 0) {
 679                 dev_err(dp->dev, "Rx Max Lane count is abnormal :%x !\n",
 680                         dp->link_train.lane_count);
 681                 dp->link_train.lane_count = (u8)LANE_COUNT1;
 682         }
 683
 684         /* Setup TX lane count & rate */
 685         if (dp->link_train.lane_count > max_lane)
 686                 dp->link_train.lane_count = max_lane;
 687         if (dp->link_train.link_rate > max_rate)
 688                 dp->link_train.link_rate = max_rate;
 689
 690         /* All DP analog module power up */
 691         exynos_dp_set_analog_power_down(dp, POWER_ALL, 0);
 692 }
 693
 694 static int exynos_dp_sw_link_training(struct exynos_dp_device *dp)
 695 {
 696         int retval = 0, training_finished = 0;
 697
 698         dp->link_train.lt_state = START;
 699
 700         /* Process here */
 701         while (!retval && !training_finished) {
 702                 switch (dp->link_train.lt_state) {
 703                 case START:
 704                         retval = exynos_dp_link_start(dp);
 705                         if (retval)
 706                                 dev_err(dp->dev, "LT link start failed!\n");
 707                         break;
 708                 case CLOCK_RECOVERY:
 709                         retval = exynos_dp_process_clock_recovery(dp);
 710                         if (retval)
 711                                 dev_err(dp->dev, "LT CR failed!\n");
 712                         break;
 713                 case EQUALIZER_TRAINING:
 714                         retval = exynos_dp_process_equalizer_training(dp);
 715                         if (retval)
 716                                 dev_err(dp->dev, "LT EQ failed!\n");
 717                         break;
 718                 case FINISHED:
 719                         training_finished = 1;
 720                         break;
 721                 case FAILED:
 722                         return -EREMOTEIO;
 723                 }
 724         }
 725         if (retval)
 726                 dev_err(dp->dev, "eDP link training failed (%d)\n", retval);
 727
 728         return retval;
 729 }
 730
 731 static int exynos_dp_set_link_train(struct exynos_dp_device *dp,
 732                                 u32 count,
 733                                 u32 bwtype)
 734 {
 735         int i;
 736         int retval;
 737
 738         for (i = 0; i < DP_TIMEOUT_LOOP_COUNT; i++) {
 739                 exynos_dp_init_training(dp, count, bwtype);
 740                 retval = exynos_dp_sw_link_training(dp);
 741                 if (retval == 0)
 742                         break;
 743
 744                 usleep_range(100, 110);
 745         }
 746
 747         return retval;
 748 }
 749
 750 static int exynos_dp_config_video(struct exynos_dp_device *dp)
 751 {
 752         int retval = 0;
 753         int timeout_loop = 0;
 754         int done_count = 0;
 755
 756         exynos_dp_config_video_slave_mode(dp);
 757
 758         exynos_dp_set_video_color_format(dp);
 759
 760         if (exynos_dp_get_pll_lock_status(dp) == PLL_UNLOCKED) {
 761                 dev_err(dp->dev, "PLL is not locked yet.\n");
 762                 return -EINVAL;
 763         }
 764
 765         for (;;) {
 766                 timeout_loop++;
 767                 if (exynos_dp_is_slave_video_stream_clock_on(dp) == 0)
 768                         break;
 769                 if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) {
 770                         dev_err(dp->dev, "Timeout of video streamclk ok\n");
 771                         return -ETIMEDOUT;
 772                 }
 773
 774                 usleep_range(1, 2);
 775         }
 776
 777         /* Set to use the register calculated M/N video */
 778         exynos_dp_set_video_cr_mn(dp, CALCULATED_M, 0, 0);
 779
 780         /* For video bist, Video timing must be generated by register */
 781         exynos_dp_set_video_timing_mode(dp, VIDEO_TIMING_FROM_CAPTURE);
 782
 783         /* Disable video mute */
 784         exynos_dp_enable_video_mute(dp, 0);
 785
 786         /* Configure video slave mode */
 787         exynos_dp_enable_video_master(dp, 0);
 788
 789         /* Enable video */
 790         exynos_dp_start_video(dp);
 791
 792         timeout_loop = 0;
 793
 794         for (;;) {
 795                 timeout_loop++;
 796                 if (exynos_dp_is_video_stream_on(dp) == 0) {
 797                         done_count++;
 798                         if (done_count > 10)
 799                                 break;
 800                 } else if (done_count) {
 801                         done_count = 0;
 802                 }
 803                 if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) {
 804                         dev_err(dp->dev, "Timeout of video streamclk ok\n");
 805                         return -ETIMEDOUT;
 806                 }
 807
 808                 usleep_range(1000, 1001);
 809         }
 810
 811         if (retval != 0)
 812                 dev_err(dp->dev, "Video stream is not detected!\n");
 813
 814         return retval;
 815 }
 816
 817 static void exynos_dp_enable_scramble(struct exynos_dp_device *dp, bool enable)
 818 {
 819         u8 data;
 820
 821         if (enable) {
 822                 exynos_dp_enable_scrambling(dp);
 823
 824                 exynos_dp_read_byte_from_dpcd(dp,
 825                         DP_TRAINING_PATTERN_SET,
 826                         &data);
 827                 exynos_dp_write_byte_to_dpcd(dp,
 828                         DP_TRAINING_PATTERN_SET,
 829                         (u8)(data & ~DP_LINK_SCRAMBLING_DISABLE));
 830         } else {
 831                 exynos_dp_disable_scrambling(dp);
 832
 833                 exynos_dp_read_byte_from_dpcd(dp,
 834                         DP_TRAINING_PATTERN_SET,
 835                         &data);
 836                 exynos_dp_write_byte_to_dpcd(dp,
 837                         DP_TRAINING_PATTERN_SET,
 838                         (u8)(data | DP_LINK_SCRAMBLING_DISABLE));
 839         }
 840 }
 841
 842 static irqreturn_t exynos_dp_irq_handler(int irq, void *arg)
 843 {
 844         struct exynos_dp_device *dp = arg;
 845
 846         enum dp_irq_type irq_type;
 847
 848         irq_type = exynos_dp_get_irq_type(dp);
 849         switch (irq_type) {
 850         case DP_IRQ_TYPE_HP_CABLE_IN:
 851                 dev_dbg(dp->dev, "Received irq - cable in\n");
 852                 schedule_work(&dp->hotplug_work);
 853                 exynos_dp_clear_hotplug_interrupts(dp);
 854                 break;
 855         case DP_IRQ_TYPE_HP_CABLE_OUT:
 856                 dev_dbg(dp->dev, "Received irq - cable out\n");
 857                 exynos_dp_clear_hotplug_interrupts(dp);
 858                 break;
 859         case DP_IRQ_TYPE_HP_CHANGE:
 860                 /*
 861                  * We get these change notifications once in a while, but there
 862                  * is nothing we can do with them. Just ignore it for now and
 863                  * only handle cable changes.
 864                  */
 865                 dev_dbg(dp->dev, "Received irq - hotplug change; ignoring.\n");
 866                 exynos_dp_clear_hotplug_interrupts(dp);
 867                 break;
 868         default:
 869                 dev_err(dp->dev, "Received irq - unknown type!\n");
 870                 break;
 871         }
 872         return IRQ_HANDLED;
 873 }
 874
 875 static void exynos_dp_hotplug(struct work_struct *work)
 876 {
 877         struct exynos_dp_device *dp;
 878         int ret;
 879
 880         dp = container_of(work, struct exynos_dp_device, hotplug_work);
 881
 882         ret = exynos_dp_detect_hpd(dp);
 883         if (ret) {
 884                 /* Cable has been disconnected, we're done */
 885                 return;
 886         }
 887
 888         ret = exynos_dp_handle_edid(dp);
 889         if (ret) {
 890                 dev_err(dp->dev, "unable to handle edid\n");
 891                 return;
 892         }
 893
 894         ret = exynos_dp_set_link_train(dp, dp->video_info->lane_count,
 895                                         dp->video_info->link_rate);
 896         if (ret) {
 897                 dev_err(dp->dev, "unable to do link train\n");
 898                 return;
 899         }
 900
 901         exynos_dp_enable_scramble(dp, 1);
 902         exynos_dp_enable_rx_to_enhanced_mode(dp, 1);
 903         exynos_dp_enable_enhanced_mode(dp, 1);
 904
 905         exynos_dp_set_lane_count(dp, dp->video_info->lane_count);
 906         exynos_dp_set_link_bandwidth(dp, dp->video_info->link_rate);
 907
 908         exynos_dp_init_video(dp);
 909         ret = exynos_dp_config_video(dp);
 910         if (ret)
 911                 dev_err(dp->dev, "unable to config video\n");
 912 }
 913
 914 static enum drm_connector_status exynos_dp_detect(
 915                                 struct drm_connector *connector, bool force)
 916 {
 917         return connector_status_connected;
 918 }
 919
 920 static void exynos_dp_connector_destroy(struct drm_connector *connector)
 921 {
 922 }
 923
 924 static struct drm_connector_funcs exynos_dp_connector_funcs = {
 925         .dpms = drm_helper_connector_dpms,
 926         .fill_modes = drm_helper_probe_single_connector_modes,
 927         .detect = exynos_dp_detect,
 928         .destroy = exynos_dp_connector_destroy,
 929 };
 930
 931 static int exynos_dp_get_modes(struct drm_connector *connector)
 932 {
 933         struct exynos_dp_device *dp = ctx_from_connector(connector);
 934         struct drm_display_mode *mode;
 935
 936         mode = drm_mode_create(connector->dev);
 937         if (!mode) {
 938                 DRM_ERROR("failed to create a new display mode.\n");
 939                 return 0;
 940         }
 941
 942         drm_display_mode_from_videomode(&dp->panel.vm, mode);
 943         mode->width_mm = dp->panel.width_mm;
 944         mode->height_mm = dp->panel.height_mm;
 945         connector->display_info.width_mm = mode->width_mm;
 946         connector->display_info.height_mm = mode->height_mm;
 947
 948         mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 949         drm_mode_set_name(mode);
 950         drm_mode_probed_add(connector, mode);
 951
 952         return 1;
 953 }
 954
 955 static struct drm_encoder *exynos_dp_best_encoder(
 956                         struct drm_connector *connector)
 957 {
 958         struct exynos_dp_device *dp = ctx_from_connector(connector);
 959
 960         return dp->encoder;
 961 }
 962
 963 static struct drm_connector_helper_funcs exynos_dp_connector_helper_funcs = {
 964         .get_modes = exynos_dp_get_modes,
 965         .best_encoder = exynos_dp_best_encoder,
 966 };
 967
 968 static bool find_bridge(const char *compat, struct bridge_init *bridge)
 969 {
 970         bridge->client = NULL;
 971         bridge->node = of_find_compatible_node(NULL, NULL, compat);
 972         if (!bridge->node)
 973                 return false;
 974
 975         bridge->client = of_find_i2c_device_by_node(bridge->node);
 976         if (!bridge->client)
 977                 return false;
 978
 979         return true;
 980 }
 981
 982 /* returns the number of bridges attached */
 983 static int exynos_drm_attach_lcd_bridge(struct drm_device *dev,
 984                 struct drm_encoder *encoder)
 985 {
 986         struct bridge_init bridge;
 987         int ret;
 988
 989         if (find_bridge("nxp,ptn3460", &bridge)) {
 990                 ret = ptn3460_init(dev, encoder, bridge.client, bridge.node);
 991                 if (!ret)
 992                         return 1;
 993         }
 994         return 0;
 995 }
 996
 997 static int exynos_dp_create_connector(struct exynos_drm_display *display,
 998                                 struct drm_encoder *encoder)
 999 {
1000         struct exynos_dp_device *dp = display->ctx;
1001         struct drm_connector *connector = &dp->connector;
1002         int ret;
1003
1004         dp->encoder = encoder;
1005
1006         /* Pre-empt DP connector creation if there's a bridge */
1007         ret = exynos_drm_attach_lcd_bridge(dp->drm_dev, encoder);
1008         if (ret)
1009                 return 0;
1010
1011         connector->polled = DRM_CONNECTOR_POLL_HPD;
1012
1013         ret = drm_connector_init(dp->drm_dev, connector,
1014                         &exynos_dp_connector_funcs, DRM_MODE_CONNECTOR_eDP);
1015         if (ret) {
1016                 DRM_ERROR("Failed to initialize connector with drm\n");
1017                 return ret;
1018         }
1019
1020         drm_connector_helper_add(connector, &exynos_dp_connector_helper_funcs);
1021         drm_sysfs_connector_add(connector);
1022         drm_mode_connector_attach_encoder(connector, encoder);
1023
1024         return 0;
1025 }
1026
1027 static void exynos_dp_phy_init(struct exynos_dp_device *dp)
1028 {
1029         if (dp->phy) {
1030                 phy_power_on(dp->phy);
1031         } else if (dp->phy_addr) {
1032                 u32 reg;
1033
1034                 reg = __raw_readl(dp->phy_addr);
1035                 reg |= dp->enable_mask;
1036                 __raw_writel(reg, dp->phy_addr);
1037         }
1038 }
1039
1040 static void exynos_dp_phy_exit(struct exynos_dp_device *dp)
1041 {
1042         if (dp->phy) {
1043                 phy_power_off(dp->phy);
1044         } else if (dp->phy_addr) {
1045                 u32 reg;
1046
1047                 reg = __raw_readl(dp->phy_addr);
1048                 reg &= ~(dp->enable_mask);
1049                 __raw_writel(reg, dp->phy_addr);
1050         }
1051 }
1052
1053 static void exynos_dp_poweron(struct exynos_dp_device *dp)
1054 {
1055         if (dp->dpms_mode == DRM_MODE_DPMS_ON)
1056                 return;
1057
1058         clk_prepare_enable(dp->clock);
1059         exynos_dp_phy_init(dp);
1060         exynos_dp_init_dp(dp);
1061         enable_irq(dp->irq);
1062 }
1063
1064 static void exynos_dp_poweroff(struct exynos_dp_device *dp)
1065 {
1066         if (dp->dpms_mode != DRM_MODE_DPMS_ON)
1067                 return;
1068
1069         disable_irq(dp->irq);
1070         flush_work(&dp->hotplug_work);
1071         exynos_dp_phy_exit(dp);
1072         clk_disable_unprepare(dp->clock);
1073 }
1074
1075 static void exynos_dp_dpms(struct exynos_drm_display *display, int mode)
1076 {
1077         struct exynos_dp_device *dp = display->ctx;
1078
1079         switch (mode) {
1080         case DRM_MODE_DPMS_ON:
1081                 exynos_dp_poweron(dp);
1082                 break;
1083         case DRM_MODE_DPMS_STANDBY:
1084         case DRM_MODE_DPMS_SUSPEND:
1085         case DRM_MODE_DPMS_OFF:
1086                 exynos_dp_poweroff(dp);
1087                 break;
1088         default:
1089                 break;
1090         }
1091         dp->dpms_mode = mode;
1092 }
1093
1094 static struct exynos_drm_display_ops exynos_dp_display_ops = {
1095         .create_connector = exynos_dp_create_connector,
1096         .dpms = exynos_dp_dpms,
1097 };
1098
1099 static struct exynos_drm_display exynos_dp_display = {
1100         .type = EXYNOS_DISPLAY_TYPE_LCD,
1101         .ops = &exynos_dp_display_ops,
1102 };
1103
1104 static struct video_info *exynos_dp_dt_parse_pdata(struct device *dev)
1105 {
1106         struct device_node *dp_node = dev->of_node;
1107         struct video_info *dp_video_config;
1108
1109         dp_video_config = devm_kzalloc(dev,
1110                                 sizeof(*dp_video_config), GFP_KERNEL);
1111         if (!dp_video_config)
1112                 return ERR_PTR(-ENOMEM);
1113
1114         dp_video_config->h_sync_polarity =
1115                 of_property_read_bool(dp_node, "hsync-active-high");
1116
1117         dp_video_config->v_sync_polarity =
1118                 of_property_read_bool(dp_node, "vsync-active-high");
1119
1120         dp_video_config->interlaced =
1121                 of_property_read_bool(dp_node, "interlaced");
1122
1123         if (of_property_read_u32(dp_node, "samsung,color-space",
1124                                 &dp_video_config->color_space)) {
1125                 dev_err(dev, "failed to get color-space\n");
1126                 return ERR_PTR(-EINVAL);
1127         }
1128
1129         if (of_property_read_u32(dp_node, "samsung,dynamic-range",
1130                                 &dp_video_config->dynamic_range)) {
1131                 dev_err(dev, "failed to get dynamic-range\n");
1132                 return ERR_PTR(-EINVAL);
1133         }
1134
1135         if (of_property_read_u32(dp_node, "samsung,ycbcr-coeff",
1136                                 &dp_video_config->ycbcr_coeff)) {
1137                 dev_err(dev, "failed to get ycbcr-coeff\n");
1138                 return ERR_PTR(-EINVAL);
1139         }
1140
1141         if (of_property_read_u32(dp_node, "samsung,color-depth",
1142                                 &dp_video_config->color_depth)) {
1143                 dev_err(dev, "failed to get color-depth\n");
1144                 return ERR_PTR(-EINVAL);
1145         }
1146
1147         if (of_property_read_u32(dp_node, "samsung,link-rate",
1148                                 &dp_video_config->link_rate)) {
1149                 dev_err(dev, "failed to get link-rate\n");
1150                 return ERR_PTR(-EINVAL);
1151         }
1152
1153         if (of_property_read_u32(dp_node, "samsung,lane-count",
1154                                 &dp_video_config->lane_count)) {
1155                 dev_err(dev, "failed to get lane-count\n");
1156                 return ERR_PTR(-EINVAL);
1157         }
1158
1159         return dp_video_config;
1160 }
1161
1162 static int exynos_dp_dt_parse_phydata(struct exynos_dp_device *dp)
1163 {
1164         struct device_node *dp_phy_node = of_node_get(dp->dev->of_node);
1165         u32 phy_base;
1166         int ret = 0;
1167
1168         dp_phy_node = of_find_node_by_name(dp_phy_node, "dptx-phy");
1169         if (!dp_phy_node) {
1170                 dp->phy = devm_phy_get(dp->dev, "dp");
1171                 return PTR_ERR_OR_ZERO(dp->phy);
1172         }
1173
1174         if (of_property_read_u32(dp_phy_node, "reg", &phy_base)) {
1175                 dev_err(dp->dev, "failed to get reg for dptx-phy\n");
1176                 ret = -EINVAL;
1177                 goto err;
1178         }
1179
1180         if (of_property_read_u32(dp_phy_node, "samsung,enable-mask",
1181                                 &dp->enable_mask)) {
1182                 dev_err(dp->dev, "failed to get enable-mask for dptx-phy\n");
1183                 ret = -EINVAL;
1184                 goto err;
1185         }
1186
1187         dp->phy_addr = ioremap(phy_base, SZ_4);
1188         if (!dp->phy_addr) {
1189                 dev_err(dp->dev, "failed to ioremap dp-phy\n");
1190                 ret = -ENOMEM;
1191                 goto err;
1192         }
1193
1194 err:
1195         of_node_put(dp_phy_node);
1196
1197         return ret;
1198 }
1199
1200 static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp)
1201 {
1202         int ret;
1203
1204         ret = of_get_videomode(dp->dev->of_node, &dp->panel.vm,
1205                         OF_USE_NATIVE_MODE);
1206         if (ret) {
1207                 DRM_ERROR("failed: of_get_videomode() : %d\n", ret);
1208                 return ret;
1209         }
1210         return 0;
1211 }
1212
1213 static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
1214 {
1215         struct platform_device *pdev = to_platform_device(dev);
1216         struct drm_device *drm_dev = data;
1217         struct resource *res;
1218         struct exynos_dp_device *dp;
1219         unsigned int irq_flags;
1220
1221         int ret = 0;
1222
1223         dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device),
1224                                 GFP_KERNEL);
1225         if (!dp)
1226                 return -ENOMEM;
1227
1228         dp->dev = &pdev->dev;
1229         dp->dpms_mode = DRM_MODE_DPMS_OFF;
1230
1231         dp->video_info = exynos_dp_dt_parse_pdata(&pdev->dev);
1232         if (IS_ERR(dp->video_info))
1233                 return PTR_ERR(dp->video_info);
1234
1235         ret = exynos_dp_dt_parse_phydata(dp);
1236         if (ret)
1237                 return ret;
1238
1239         ret = exynos_dp_dt_parse_panel(dp);
1240         if (ret)
1241                 return ret;
1242
1243         dp->clock = devm_clk_get(&pdev->dev, "dp");
1244         if (IS_ERR(dp->clock)) {
1245                 dev_err(&pdev->dev, "failed to get clock\n");
1246                 return PTR_ERR(dp->clock);
1247         }
1248
1249         clk_prepare_enable(dp->clock);
1250
1251         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1252
1253         dp->reg_base = devm_ioremap_resource(&pdev->dev, res);
1254         if (IS_ERR(dp->reg_base))
1255                 return PTR_ERR(dp->reg_base);
1256
1257         dp->hpd_gpio = of_get_named_gpio(dev->of_node, "samsung,hpd-gpio", 0);
1258
1259         if (gpio_is_valid(dp->hpd_gpio)) {
1260                 /*
1261                  * Set up the hotplug GPIO from the device tree as an interrupt.
1262                  * Simply specifying a different interrupt in the device tree
1263                  * doesn't work since we handle hotplug rather differently when
1264                  * using a GPIO.  We also need the actual GPIO specifier so
1265                  * that we can get the current state of the GPIO.
1266                  */
1267                 ret = devm_gpio_request_one(&pdev->dev, dp->hpd_gpio, GPIOF_IN,
1268                                             "hpd_gpio");
1269                 if (ret) {
1270                         dev_err(&pdev->dev, "failed to get hpd gpio\n");
1271                         return ret;
1272                 }
1273                 dp->irq = gpio_to_irq(dp->hpd_gpio);
1274                 irq_flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
1275         } else {
1276                 dp->hpd_gpio = -ENODEV;
1277                 dp->irq = platform_get_irq(pdev, 0);
1278                 irq_flags = 0;
1279         }
1280
1281         if (dp->irq == -ENXIO) {
1282                 dev_err(&pdev->dev, "failed to get irq\n");
1283                 return -ENODEV;
1284         }
1285
1286         INIT_WORK(&dp->hotplug_work, exynos_dp_hotplug);
1287
1288         exynos_dp_phy_init(dp);
1289
1290         exynos_dp_init_dp(dp);
1291
1292         ret = devm_request_irq(&pdev->dev, dp->irq, exynos_dp_irq_handler,
1293                         irq_flags, "exynos-dp", dp);
1294         if (ret) {
1295                 dev_err(&pdev->dev, "failed to request irq\n");
1296                 return ret;
1297         }
1298         disable_irq(dp->irq);
1299
1300         dp->drm_dev = drm_dev;
1301         exynos_dp_display.ctx = dp;
1302
1303         platform_set_drvdata(pdev, &exynos_dp_display);
1304
1305         return exynos_drm_create_enc_conn(drm_dev, &exynos_dp_display);
1306 }
1307
1308 static void exynos_dp_unbind(struct device *dev, struct device *master,
1309                                 void *data)
1310 {
1311         struct exynos_drm_display *display = dev_get_drvdata(dev);
1312         struct exynos_dp_device *dp = display->ctx;
1313         struct drm_encoder *encoder = dp->encoder;
1314
1315         exynos_dp_dpms(display, DRM_MODE_DPMS_OFF);
1316
1317         encoder->funcs->destroy(encoder);
1318         drm_connector_cleanup(&dp->connector);
1319 }
1320
1321 static const struct component_ops exynos_dp_ops = {
1322         .bind   = exynos_dp_bind,
1323         .unbind = exynos_dp_unbind,
1324 };
1325
1326 static int exynos_dp_probe(struct platform_device *pdev)
1327 {
1328         int ret;
1329
1330         ret = exynos_drm_component_add(&pdev->dev, EXYNOS_DEVICE_TYPE_CONNECTOR,
1331                                         exynos_dp_display.type);
1332         if (ret)
1333                 return ret;
1334
1335         ret = component_add(&pdev->dev, &exynos_dp_ops);
1336         if (ret)
1337                 exynos_drm_component_del(&pdev->dev,
1338                                                 EXYNOS_DEVICE_TYPE_CONNECTOR);
1339
1340         return ret;
1341 }
1342
1343 static int exynos_dp_remove(struct platform_device *pdev)
1344 {
1345         component_del(&pdev->dev, &exynos_dp_ops);
1346         exynos_drm_component_del(&pdev->dev, EXYNOS_DEVICE_TYPE_CONNECTOR);
1347
1348         return 0;
1349 }
1350
1351 #ifdef CONFIG_PM_SLEEP
1352 static int exynos_dp_suspend(struct device *dev)
1353 {
1354         struct platform_device *pdev = to_platform_device(dev);
1355         struct exynos_drm_display *display = platform_get_drvdata(pdev);
1356
1357         exynos_dp_dpms(display, DRM_MODE_DPMS_OFF);
1358         return 0;
1359 }
1360
1361 static int exynos_dp_resume(struct device *dev)
1362 {
1363         struct platform_device *pdev = to_platform_device(dev);
1364         struct exynos_drm_display *display = platform_get_drvdata(pdev);
1365
1366         exynos_dp_dpms(display, DRM_MODE_DPMS_ON);
1367         return 0;
1368 }
1369 #endif
1370
1371 static const struct dev_pm_ops exynos_dp_pm_ops = {
1372         SET_SYSTEM_SLEEP_PM_OPS(exynos_dp_suspend, exynos_dp_resume)
1373 };
1374
1375 static const struct of_device_id exynos_dp_match[] = {
1376         { .compatible = "samsung,exynos5-dp" },
1377         {},
1378 };
1379
1380 struct platform_driver dp_driver = {
1381         .probe          = exynos_dp_probe,
1382         .remove         = exynos_dp_remove,
1383         .driver         = {
1384                 .name   = "exynos-dp",
1385                 .owner  = THIS_MODULE,
1386                 .pm     = &exynos_dp_pm_ops,
1387                 .of_match_table = exynos_dp_match,
1388         },
1389 };
1390
1391 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
1392 MODULE_DESCRIPTION("Samsung SoC DP Driver");
1393 MODULE_LICENSE("GPL");