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/phy/phy.h>
  22 #include <video/of_display_timing.h>
  23 #include <video/of_videomode.h>
  24
  25 #include <drm/drmP.h>
  26 #include <drm/drm_crtc.h>
  27 #include <drm/drm_crtc_helper.h>
  28 #include <drm/bridge/ptn3460.h>
  29
  30 #include "exynos_drm_drv.h"
  31 #include "exynos_dp_core.h"
  32
  33 #define ctx_from_connector(c)   container_of(c, struct exynos_dp_device, \
  34                                         connector)
  35
  36 struct bridge_init {
  37         struct i2c_client *client;
  38         struct device_node *node;
  39 };
  40
  41 static int exynos_dp_init_dp(struct exynos_dp_device *dp)
  42 {
  43         exynos_dp_reset(dp);
  44
  45         exynos_dp_swreset(dp);
  46
  47         exynos_dp_init_analog_param(dp);
  48         exynos_dp_init_interrupt(dp);
  49
  50         /* SW defined function Normal operation */
  51         exynos_dp_enable_sw_function(dp);
  52
  53         exynos_dp_config_interrupt(dp);
  54         exynos_dp_init_analog_func(dp);
  55
  56         exynos_dp_init_hpd(dp);
  57         exynos_dp_init_aux(dp);
  58
  59         return 0;
  60 }
  61
  62 static int exynos_dp_detect_hpd(struct exynos_dp_device *dp)
  63 {
  64         int timeout_loop = 0;
  65
  66         while (exynos_dp_get_plug_in_status(dp) != 0) {
  67                 timeout_loop++;
  68                 if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) {
  69                         dev_err(dp->dev, "failed to get hpd plug status\n");
  70                         return -ETIMEDOUT;
  71                 }
  72                 usleep_range(10, 11);
  73         }
  74
  75         return 0;
  76 }
  77
  78 static unsigned char exynos_dp_calc_edid_check_sum(unsigned char *edid_data)
  79 {
  80         int i;
  81         unsigned char sum = 0;
  82
  83         for (i = 0; i < EDID_BLOCK_LENGTH; i++)
  84                 sum = sum + edid_data[i];
  85
  86         return sum;
  87 }
  88
  89 static int exynos_dp_read_edid(struct exynos_dp_device *dp)
  90 {
  91         unsigned char edid[EDID_BLOCK_LENGTH * 2];
  92         unsigned int extend_block = 0;
  93         unsigned char sum;
  94         unsigned char test_vector;
  95         int retval;
  96
  97         /*
  98          * EDID device address is 0x50.
  99          * However, if necessary, you must have set upper address
 100          * into E-EDID in I2C device, 0x30.
 101          */
 102
 103         /* Read Extension Flag, Number of 128-byte EDID extension blocks */
 104         retval = exynos_dp_read_byte_from_i2c(dp, I2C_EDID_DEVICE_ADDR,
 105                                 EDID_EXTENSION_FLAG,
 106                                 &extend_block);
 107         if (retval)
 108                 return retval;
 109
 110         if (extend_block > 0) {
 111                 dev_dbg(dp->dev, "EDID data includes a single extension!\n");
 112
 113                 /* Read EDID data */
 114                 retval = exynos_dp_read_bytes_from_i2c(dp, I2C_EDID_DEVICE_ADDR,
 115                                                 EDID_HEADER_PATTERN,
 116                                                 EDID_BLOCK_LENGTH,
 117                                                 &edid[EDID_HEADER_PATTERN]);
 118                 if (retval != 0) {
 119                         dev_err(dp->dev, "EDID Read failed!\n");
 120                         return -EIO;
 121                 }
 122                 sum = exynos_dp_calc_edid_check_sum(edid);
 123                 if (sum != 0) {
 124                         dev_err(dp->dev, "EDID bad checksum!\n");
 125                         return -EIO;
 126                 }
 127
 128                 /* Read additional EDID data */
 129                 retval = exynos_dp_read_bytes_from_i2c(dp,
 130                                 I2C_EDID_DEVICE_ADDR,
 131                                 EDID_BLOCK_LENGTH,
 132                                 EDID_BLOCK_LENGTH,
 133                                 &edid[EDID_BLOCK_LENGTH]);
 134                 if (retval != 0) {
 135                         dev_err(dp->dev, "EDID Read failed!\n");
 136                         return -EIO;
 137                 }
 138                 sum = exynos_dp_calc_edid_check_sum(&edid[EDID_BLOCK_LENGTH]);
 139                 if (sum != 0) {
 140                         dev_err(dp->dev, "EDID bad checksum!\n");
 141                         return -EIO;
 142                 }
 143
 144                 exynos_dp_read_byte_from_dpcd(dp, DPCD_ADDR_TEST_REQUEST,
 145                                         &test_vector);
 146                 if (test_vector & DPCD_TEST_EDID_READ) {
 147                         exynos_dp_write_byte_to_dpcd(dp,
 148                                 DPCD_ADDR_TEST_EDID_CHECKSUM,
 149                                 edid[EDID_BLOCK_LENGTH + EDID_CHECKSUM]);
 150                         exynos_dp_write_byte_to_dpcd(dp,
 151                                 DPCD_ADDR_TEST_RESPONSE,
 152                                 DPCD_TEST_EDID_CHECKSUM_WRITE);
 153                 }
 154         } else {
 155                 dev_info(dp->dev, "EDID data does not include any extensions.\n");
 156
 157                 /* Read EDID data */
 158                 retval = exynos_dp_read_bytes_from_i2c(dp,
 159                                 I2C_EDID_DEVICE_ADDR,
 160                                 EDID_HEADER_PATTERN,
 161                                 EDID_BLOCK_LENGTH,
 162                                 &edid[EDID_HEADER_PATTERN]);
 163                 if (retval != 0) {
 164                         dev_err(dp->dev, "EDID Read failed!\n");
 165                         return -EIO;
 166                 }
 167                 sum = exynos_dp_calc_edid_check_sum(edid);
 168                 if (sum != 0) {
 169                         dev_err(dp->dev, "EDID bad checksum!\n");
 170                         return -EIO;
 171                 }
 172
 173                 exynos_dp_read_byte_from_dpcd(dp,
 174                         DPCD_ADDR_TEST_REQUEST,
 175                         &test_vector);
 176                 if (test_vector & DPCD_TEST_EDID_READ) {
 177                         exynos_dp_write_byte_to_dpcd(dp,
 178                                 DPCD_ADDR_TEST_EDID_CHECKSUM,
 179                                 edid[EDID_CHECKSUM]);
 180                         exynos_dp_write_byte_to_dpcd(dp,
 181                                 DPCD_ADDR_TEST_RESPONSE,
 182                                 DPCD_TEST_EDID_CHECKSUM_WRITE);
 183                 }
 184         }
 185
 186         dev_err(dp->dev, "EDID Read success!\n");
 187         return 0;
 188 }
 189
 190 static int exynos_dp_handle_edid(struct exynos_dp_device *dp)
 191 {
 192         u8 buf[12];
 193         int i;
 194         int retval;
 195
 196         /* Read DPCD DPCD_ADDR_DPCD_REV~RECEIVE_PORT1_CAP_1 */
 197         retval = exynos_dp_read_bytes_from_dpcd(dp, DPCD_ADDR_DPCD_REV,
 198                                 12, buf);
 199         if (retval)
 200                 return retval;
 201
 202         /* Read EDID */
 203         for (i = 0; i < 3; i++) {
 204                 retval = exynos_dp_read_edid(dp);
 205                 if (!retval)
 206                         break;
 207         }
 208
 209         return retval;
 210 }
 211
 212 static void exynos_dp_enable_rx_to_enhanced_mode(struct exynos_dp_device *dp,
 213                                                 bool enable)
 214 {
 215         u8 data;
 216
 217         exynos_dp_read_byte_from_dpcd(dp, DPCD_ADDR_LANE_COUNT_SET, &data);
 218
 219         if (enable)
 220                 exynos_dp_write_byte_to_dpcd(dp, DPCD_ADDR_LANE_COUNT_SET,
 221                         DPCD_ENHANCED_FRAME_EN |
 222                         DPCD_LANE_COUNT_SET(data));
 223         else
 224                 exynos_dp_write_byte_to_dpcd(dp, DPCD_ADDR_LANE_COUNT_SET,
 225                         DPCD_LANE_COUNT_SET(data));
 226 }
 227
 228 static int exynos_dp_is_enhanced_mode_available(struct exynos_dp_device *dp)
 229 {
 230         u8 data;
 231         int retval;
 232
 233         exynos_dp_read_byte_from_dpcd(dp, DPCD_ADDR_MAX_LANE_COUNT, &data);
 234         retval = DPCD_ENHANCED_FRAME_CAP(data);
 235
 236         return retval;
 237 }
 238
 239 static void exynos_dp_set_enhanced_mode(struct exynos_dp_device *dp)
 240 {
 241         u8 data;
 242
 243         data = exynos_dp_is_enhanced_mode_available(dp);
 244         exynos_dp_enable_rx_to_enhanced_mode(dp, data);
 245         exynos_dp_enable_enhanced_mode(dp, data);
 246 }
 247
 248 static void exynos_dp_training_pattern_dis(struct exynos_dp_device *dp)
 249 {
 250         exynos_dp_set_training_pattern(dp, DP_NONE);
 251
 252         exynos_dp_write_byte_to_dpcd(dp,
 253                 DPCD_ADDR_TRAINING_PATTERN_SET,
 254                 DPCD_TRAINING_PATTERN_DISABLED);
 255 }
 256
 257 static void exynos_dp_set_lane_lane_pre_emphasis(struct exynos_dp_device *dp,
 258                                         int pre_emphasis, int lane)
 259 {
 260         switch (lane) {
 261         case 0:
 262                 exynos_dp_set_lane0_pre_emphasis(dp, pre_emphasis);
 263                 break;
 264         case 1:
 265                 exynos_dp_set_lane1_pre_emphasis(dp, pre_emphasis);
 266                 break;
 267
 268         case 2:
 269                 exynos_dp_set_lane2_pre_emphasis(dp, pre_emphasis);
 270                 break;
 271
 272         case 3:
 273                 exynos_dp_set_lane3_pre_emphasis(dp, pre_emphasis);
 274                 break;
 275         }
 276 }
 277
 278 static int exynos_dp_link_start(struct exynos_dp_device *dp)
 279 {
 280         u8 buf[4];
 281         int lane, lane_count, pll_tries, retval;
 282
 283         lane_count = dp->link_train.lane_count;
 284
 285         dp->link_train.lt_state = CLOCK_RECOVERY;
 286         dp->link_train.eq_loop = 0;
 287
 288         for (lane = 0; lane < lane_count; lane++)
 289                 dp->link_train.cr_loop[lane] = 0;
 290
 291         /* Set link rate and count as you want to establish*/
 292         exynos_dp_set_link_bandwidth(dp, dp->link_train.link_rate);
 293         exynos_dp_set_lane_count(dp, dp->link_train.lane_count);
 294
 295         /* Setup RX configuration */
 296         buf[0] = dp->link_train.link_rate;
 297         buf[1] = dp->link_train.lane_count;
 298         retval = exynos_dp_write_bytes_to_dpcd(dp, DPCD_ADDR_LINK_BW_SET,
 299                                 2, buf);
 300         if (retval)
 301                 return retval;
 302
 303         /* Set TX pre-emphasis to minimum */
 304         for (lane = 0; lane < lane_count; lane++)
 305                 exynos_dp_set_lane_lane_pre_emphasis(dp,
 306                         PRE_EMPHASIS_LEVEL_0, lane);
 307
 308         /* Wait for PLL lock */
 309         pll_tries = 0;
 310         while (exynos_dp_get_pll_lock_status(dp) == PLL_UNLOCKED) {
 311                 if (pll_tries == DP_TIMEOUT_LOOP_COUNT) {
 312                         dev_err(dp->dev, "Wait for PLL lock timed out\n");
 313                         return -ETIMEDOUT;
 314                 }
 315
 316                 pll_tries++;
 317                 usleep_range(90, 120);
 318         }
 319
 320         /* Set training pattern 1 */
 321         exynos_dp_set_training_pattern(dp, TRAINING_PTN1);
 322
 323         /* Set RX training pattern */
 324         retval = exynos_dp_write_byte_to_dpcd(dp,
 325                         DPCD_ADDR_TRAINING_PATTERN_SET,
 326                         DPCD_SCRAMBLING_DISABLED | DPCD_TRAINING_PATTERN_1);
 327         if (retval)
 328                 return retval;
 329
 330         for (lane = 0; lane < lane_count; lane++)
 331                 buf[lane] = DPCD_PRE_EMPHASIS_PATTERN2_LEVEL0 |
 332                             DPCD_VOLTAGE_SWING_PATTERN1_LEVEL0;
 333
 334         retval = exynos_dp_write_bytes_to_dpcd(dp, DPCD_ADDR_TRAINING_LANE0_SET,
 335                         lane_count, buf);
 336
 337         return retval;
 338 }
 339
 340 static unsigned char exynos_dp_get_lane_status(u8 link_status[2], int lane)
 341 {
 342         int shift = (lane & 1) * 4;
 343         u8 link_value = link_status[lane>>1];
 344
 345         return (link_value >> shift) & 0xf;
 346 }
 347
 348 static int exynos_dp_clock_recovery_ok(u8 link_status[2], int lane_count)
 349 {
 350         int lane;
 351         u8 lane_status;
 352
 353         for (lane = 0; lane < lane_count; lane++) {
 354                 lane_status = exynos_dp_get_lane_status(link_status, lane);
 355                 if ((lane_status & DPCD_LANE_CR_DONE) == 0)
 356                         return -EINVAL;
 357         }
 358         return 0;
 359 }
 360
 361 static int exynos_dp_channel_eq_ok(u8 link_status[2], u8 link_align,
 362                                 int lane_count)
 363 {
 364         int lane;
 365         u8 lane_status;
 366
 367         if ((link_align & DPCD_INTERLANE_ALIGN_DONE) == 0)
 368                 return -EINVAL;
 369
 370         for (lane = 0; lane < lane_count; lane++) {
 371                 lane_status = exynos_dp_get_lane_status(link_status, lane);
 372                 lane_status &= DPCD_CHANNEL_EQ_BITS;
 373                 if (lane_status != DPCD_CHANNEL_EQ_BITS)
 374                         return -EINVAL;
 375         }
 376
 377         return 0;
 378 }
 379
 380 static unsigned char exynos_dp_get_adjust_request_voltage(u8 adjust_request[2],
 381                                                         int lane)
 382 {
 383         int shift = (lane & 1) * 4;
 384         u8 link_value = adjust_request[lane>>1];
 385
 386         return (link_value >> shift) & 0x3;
 387 }
 388
 389 static unsigned char exynos_dp_get_adjust_request_pre_emphasis(
 390                                         u8 adjust_request[2],
 391                                         int lane)
 392 {
 393         int shift = (lane & 1) * 4;
 394         u8 link_value = adjust_request[lane>>1];
 395
 396         return ((link_value >> shift) & 0xc) >> 2;
 397 }
 398
 399 static void exynos_dp_set_lane_link_training(struct exynos_dp_device *dp,
 400                                         u8 training_lane_set, int lane)
 401 {
 402         switch (lane) {
 403         case 0:
 404                 exynos_dp_set_lane0_link_training(dp, training_lane_set);
 405                 break;
 406         case 1:
 407                 exynos_dp_set_lane1_link_training(dp, training_lane_set);
 408                 break;
 409
 410         case 2:
 411                 exynos_dp_set_lane2_link_training(dp, training_lane_set);
 412                 break;
 413
 414         case 3:
 415                 exynos_dp_set_lane3_link_training(dp, training_lane_set);
 416                 break;
 417         }
 418 }
 419
 420 static unsigned int exynos_dp_get_lane_link_training(
 421                                 struct exynos_dp_device *dp,
 422                                 int lane)
 423 {
 424         u32 reg;
 425
 426         switch (lane) {
 427         case 0:
 428                 reg = exynos_dp_get_lane0_link_training(dp);
 429                 break;
 430         case 1:
 431                 reg = exynos_dp_get_lane1_link_training(dp);
 432                 break;
 433         case 2:
 434                 reg = exynos_dp_get_lane2_link_training(dp);
 435                 break;
 436         case 3:
 437                 reg = exynos_dp_get_lane3_link_training(dp);
 438                 break;
 439         default:
 440                 WARN_ON(1);
 441                 return 0;
 442         }
 443
 444         return reg;
 445 }
 446
 447 static void exynos_dp_reduce_link_rate(struct exynos_dp_device *dp)
 448 {
 449         exynos_dp_training_pattern_dis(dp);
 450         exynos_dp_set_enhanced_mode(dp);
 451
 452         dp->link_train.lt_state = FAILED;
 453 }
 454
 455 static void exynos_dp_get_adjust_training_lane(struct exynos_dp_device *dp,
 456                                         u8 adjust_request[2])
 457 {
 458         int lane, lane_count;
 459         u8 voltage_swing, pre_emphasis, training_lane;
 460
 461         lane_count = dp->link_train.lane_count;
 462         for (lane = 0; lane < lane_count; lane++) {
 463                 voltage_swing = exynos_dp_get_adjust_request_voltage(
 464                                                 adjust_request, lane);
 465                 pre_emphasis = exynos_dp_get_adjust_request_pre_emphasis(
 466                                                 adjust_request, lane);
 467                 training_lane = DPCD_VOLTAGE_SWING_SET(voltage_swing) |
 468                                 DPCD_PRE_EMPHASIS_SET(pre_emphasis);
 469
 470                 if (voltage_swing == VOLTAGE_LEVEL_3)
 471                         training_lane |= DPCD_MAX_SWING_REACHED;
 472                 if (pre_emphasis == PRE_EMPHASIS_LEVEL_3)
 473                         training_lane |= DPCD_MAX_PRE_EMPHASIS_REACHED;
 474
 475                 dp->link_train.training_lane[lane] = training_lane;
 476         }
 477 }
 478
 479 static int exynos_dp_process_clock_recovery(struct exynos_dp_device *dp)
 480 {
 481         int lane, lane_count, retval;
 482         u8 voltage_swing, pre_emphasis, training_lane;
 483         u8 link_status[2], adjust_request[2];
 484
 485         usleep_range(100, 101);
 486
 487         lane_count = dp->link_train.lane_count;
 488
 489         retval =  exynos_dp_read_bytes_from_dpcd(dp,
 490                         DPCD_ADDR_LANE0_1_STATUS, 2, link_status);
 491         if (retval)
 492                 return retval;
 493
 494         retval =  exynos_dp_read_bytes_from_dpcd(dp,
 495                         DPCD_ADDR_ADJUST_REQUEST_LANE0_1, 2, adjust_request);
 496         if (retval)
 497                 return retval;
 498
 499         if (exynos_dp_clock_recovery_ok(link_status, lane_count) == 0) {
 500                 /* set training pattern 2 for EQ */
 501                 exynos_dp_set_training_pattern(dp, TRAINING_PTN2);
 502
 503                 retval = exynos_dp_write_byte_to_dpcd(dp,
 504                                 DPCD_ADDR_TRAINING_PATTERN_SET,
 505                                 DPCD_SCRAMBLING_DISABLED |
 506                                 DPCD_TRAINING_PATTERN_2);
 507                 if (retval)
 508                         return retval;
 509
 510                 dev_info(dp->dev, "Link Training Clock Recovery success\n");
 511                 dp->link_train.lt_state = EQUALIZER_TRAINING;
 512         } else {
 513                 for (lane = 0; lane < lane_count; lane++) {
 514                         training_lane = exynos_dp_get_lane_link_training(
 515                                                         dp, lane);
 516                         voltage_swing = exynos_dp_get_adjust_request_voltage(
 517                                                         adjust_request, lane);
 518                         pre_emphasis = exynos_dp_get_adjust_request_pre_emphasis(
 519                                                         adjust_request, lane);
 520
 521                         if (DPCD_VOLTAGE_SWING_GET(training_lane) ==
 522                                         voltage_swing &&
 523                             DPCD_PRE_EMPHASIS_GET(training_lane) ==
 524                                         pre_emphasis)
 525                                 dp->link_train.cr_loop[lane]++;
 526
 527                         if (dp->link_train.cr_loop[lane] == MAX_CR_LOOP ||
 528                             voltage_swing == VOLTAGE_LEVEL_3 ||
 529                             pre_emphasis == PRE_EMPHASIS_LEVEL_3) {
 530                                 dev_err(dp->dev, "CR Max reached (%d,%d,%d)\n",
 531                                         dp->link_train.cr_loop[lane],
 532                                         voltage_swing, pre_emphasis);
 533                                 exynos_dp_reduce_link_rate(dp);
 534                                 return -EIO;
 535                         }
 536                 }
 537         }
 538
 539         exynos_dp_get_adjust_training_lane(dp, adjust_request);
 540
 541         for (lane = 0; lane < lane_count; lane++)
 542                 exynos_dp_set_lane_link_training(dp,
 543                         dp->link_train.training_lane[lane], lane);
 544
 545         retval = exynos_dp_write_bytes_to_dpcd(dp,
 546                         DPCD_ADDR_TRAINING_LANE0_SET, lane_count,
 547                         dp->link_train.training_lane);
 548         if (retval)
 549                 return retval;
 550
 551         return retval;
 552 }
 553
 554 static int exynos_dp_process_equalizer_training(struct exynos_dp_device *dp)
 555 {
 556         int lane, lane_count, retval;
 557         u32 reg;
 558         u8 link_align, link_status[2], adjust_request[2];
 559
 560         usleep_range(400, 401);
 561
 562         lane_count = dp->link_train.lane_count;
 563
 564         retval = exynos_dp_read_bytes_from_dpcd(dp,
 565                         DPCD_ADDR_LANE0_1_STATUS, 2, link_status);
 566         if (retval)
 567                 return retval;
 568
 569         if (exynos_dp_clock_recovery_ok(link_status, lane_count)) {
 570                 exynos_dp_reduce_link_rate(dp);
 571                 return -EIO;
 572         }
 573
 574         retval = exynos_dp_read_bytes_from_dpcd(dp,
 575                         DPCD_ADDR_ADJUST_REQUEST_LANE0_1, 2, adjust_request);
 576         if (retval)
 577                 return retval;
 578
 579         retval = exynos_dp_read_byte_from_dpcd(dp,
 580                         DPCD_ADDR_LANE_ALIGN_STATUS_UPDATED, &link_align);
 581         if (retval)
 582                 return retval;
 583
 584         exynos_dp_get_adjust_training_lane(dp, adjust_request);
 585
 586         if (!exynos_dp_channel_eq_ok(link_status, link_align, lane_count)) {
 587                 /* traing pattern Set to Normal */
 588                 exynos_dp_training_pattern_dis(dp);
 589
 590                 dev_info(dp->dev, "Link Training success!\n");
 591
 592                 exynos_dp_get_link_bandwidth(dp, &reg);
 593                 dp->link_train.link_rate = reg;
 594                 dev_dbg(dp->dev, "final bandwidth = %.2x\n",
 595                         dp->link_train.link_rate);
 596
 597                 exynos_dp_get_lane_count(dp, &reg);
 598                 dp->link_train.lane_count = reg;
 599                 dev_dbg(dp->dev, "final lane count = %.2x\n",
 600                         dp->link_train.lane_count);
 601
 602                 /* set enhanced mode if available */
 603                 exynos_dp_set_enhanced_mode(dp);
 604                 dp->link_train.lt_state = FINISHED;
 605
 606                 return 0;
 607         }
 608
 609         /* not all locked */
 610         dp->link_train.eq_loop++;
 611
 612         if (dp->link_train.eq_loop > MAX_EQ_LOOP) {
 613                 dev_err(dp->dev, "EQ Max loop\n");
 614                 exynos_dp_reduce_link_rate(dp);
 615                 return -EIO;
 616         }
 617
 618         for (lane = 0; lane < lane_count; lane++)
 619                 exynos_dp_set_lane_link_training(dp,
 620                         dp->link_train.training_lane[lane], lane);
 621
 622         retval = exynos_dp_write_bytes_to_dpcd(dp, DPCD_ADDR_TRAINING_LANE0_SET,
 623                         lane_count, dp->link_train.training_lane);
 624
 625         return retval;
 626 }
 627
 628 static void exynos_dp_get_max_rx_bandwidth(struct exynos_dp_device *dp,
 629                                         u8 *bandwidth)
 630 {
 631         u8 data;
 632
 633         /*
 634          * For DP rev.1.1, Maximum link rate of Main Link lanes
 635          * 0x06 = 1.62 Gbps, 0x0a = 2.7 Gbps
 636          */
 637         exynos_dp_read_byte_from_dpcd(dp, DPCD_ADDR_MAX_LINK_RATE, &data);
 638         *bandwidth = data;
 639 }
 640
 641 static void exynos_dp_get_max_rx_lane_count(struct exynos_dp_device *dp,
 642                                         u8 *lane_count)
 643 {
 644         u8 data;
 645
 646         /*
 647          * For DP rev.1.1, Maximum number of Main Link lanes
 648          * 0x01 = 1 lane, 0x02 = 2 lanes, 0x04 = 4 lanes
 649          */
 650         exynos_dp_read_byte_from_dpcd(dp, DPCD_ADDR_MAX_LANE_COUNT, &data);
 651         *lane_count = DPCD_MAX_LANE_COUNT(data);
 652 }
 653
 654 static void exynos_dp_init_training(struct exynos_dp_device *dp,
 655                         enum link_lane_count_type max_lane,
 656                         enum link_rate_type max_rate)
 657 {
 658         /*
 659          * MACRO_RST must be applied after the PLL_LOCK to avoid
 660          * the DP inter pair skew issue for at least 10 us
 661          */
 662         exynos_dp_reset_macro(dp);
 663
 664         /* Initialize by reading RX's DPCD */
 665         exynos_dp_get_max_rx_bandwidth(dp, &dp->link_train.link_rate);
 666         exynos_dp_get_max_rx_lane_count(dp, &dp->link_train.lane_count);
 667
 668         if ((dp->link_train.link_rate != LINK_RATE_1_62GBPS) &&
 669            (dp->link_train.link_rate != LINK_RATE_2_70GBPS)) {
 670                 dev_err(dp->dev, "Rx Max Link Rate is abnormal :%x !\n",
 671                         dp->link_train.link_rate);
 672                 dp->link_train.link_rate = LINK_RATE_1_62GBPS;
 673         }
 674
 675         if (dp->link_train.lane_count == 0) {
 676                 dev_err(dp->dev, "Rx Max Lane count is abnormal :%x !\n",
 677                         dp->link_train.lane_count);
 678                 dp->link_train.lane_count = (u8)LANE_COUNT1;
 679         }
 680
 681         /* Setup TX lane count & rate */
 682         if (dp->link_train.lane_count > max_lane)
 683                 dp->link_train.lane_count = max_lane;
 684         if (dp->link_train.link_rate > max_rate)
 685                 dp->link_train.link_rate = max_rate;
 686
 687         /* All DP analog module power up */
 688         exynos_dp_set_analog_power_down(dp, POWER_ALL, 0);
 689 }
 690
 691 static int exynos_dp_sw_link_training(struct exynos_dp_device *dp)
 692 {
 693         int retval = 0, training_finished = 0;
 694
 695         dp->link_train.lt_state = START;
 696
 697         /* Process here */
 698         while (!retval && !training_finished) {
 699                 switch (dp->link_train.lt_state) {
 700                 case START:
 701                         retval = exynos_dp_link_start(dp);
 702                         if (retval)
 703                                 dev_err(dp->dev, "LT link start failed!\n");
 704                         break;
 705                 case CLOCK_RECOVERY:
 706                         retval = exynos_dp_process_clock_recovery(dp);
 707                         if (retval)
 708                                 dev_err(dp->dev, "LT CR failed!\n");
 709                         break;
 710                 case EQUALIZER_TRAINING:
 711                         retval = exynos_dp_process_equalizer_training(dp);
 712                         if (retval)
 713                                 dev_err(dp->dev, "LT EQ failed!\n");
 714                         break;
 715                 case FINISHED:
 716                         training_finished = 1;
 717                         break;
 718                 case FAILED:
 719                         return -EREMOTEIO;
 720                 }
 721         }
 722         if (retval)
 723                 dev_err(dp->dev, "eDP link training failed (%d)\n", retval);
 724
 725         return retval;
 726 }
 727
 728 static int exynos_dp_set_link_train(struct exynos_dp_device *dp,
 729                                 u32 count,
 730                                 u32 bwtype)
 731 {
 732         int i;
 733         int retval;
 734
 735         for (i = 0; i < DP_TIMEOUT_LOOP_COUNT; i++) {
 736                 exynos_dp_init_training(dp, count, bwtype);
 737                 retval = exynos_dp_sw_link_training(dp);
 738                 if (retval == 0)
 739                         break;
 740
 741                 usleep_range(100, 110);
 742         }
 743
 744         return retval;
 745 }
 746
 747 static int exynos_dp_config_video(struct exynos_dp_device *dp)
 748 {
 749         int retval = 0;
 750         int timeout_loop = 0;
 751         int done_count = 0;
 752
 753         exynos_dp_config_video_slave_mode(dp);
 754
 755         exynos_dp_set_video_color_format(dp);
 756
 757         if (exynos_dp_get_pll_lock_status(dp) == PLL_UNLOCKED) {
 758                 dev_err(dp->dev, "PLL is not locked yet.\n");
 759                 return -EINVAL;
 760         }
 761
 762         for (;;) {
 763                 timeout_loop++;
 764                 if (exynos_dp_is_slave_video_stream_clock_on(dp) == 0)
 765                         break;
 766                 if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) {
 767                         dev_err(dp->dev, "Timeout of video streamclk ok\n");
 768                         return -ETIMEDOUT;
 769                 }
 770
 771                 usleep_range(1, 2);
 772         }
 773
 774         /* Set to use the register calculated M/N video */
 775         exynos_dp_set_video_cr_mn(dp, CALCULATED_M, 0, 0);
 776
 777         /* For video bist, Video timing must be generated by register */
 778         exynos_dp_set_video_timing_mode(dp, VIDEO_TIMING_FROM_CAPTURE);
 779
 780         /* Disable video mute */
 781         exynos_dp_enable_video_mute(dp, 0);
 782
 783         /* Configure video slave mode */
 784         exynos_dp_enable_video_master(dp, 0);
 785
 786         /* Enable video */
 787         exynos_dp_start_video(dp);
 788
 789         timeout_loop = 0;
 790
 791         for (;;) {
 792                 timeout_loop++;
 793                 if (exynos_dp_is_video_stream_on(dp) == 0) {
 794                         done_count++;
 795                         if (done_count > 10)
 796                                 break;
 797                 } else if (done_count) {
 798                         done_count = 0;
 799                 }
 800                 if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) {
 801                         dev_err(dp->dev, "Timeout of video streamclk ok\n");
 802                         return -ETIMEDOUT;
 803                 }
 804
 805                 usleep_range(1000, 1001);
 806         }
 807
 808         if (retval != 0)
 809                 dev_err(dp->dev, "Video stream is not detected!\n");
 810
 811         return retval;
 812 }
 813
 814 static void exynos_dp_enable_scramble(struct exynos_dp_device *dp, bool enable)
 815 {
 816         u8 data;
 817
 818         if (enable) {
 819                 exynos_dp_enable_scrambling(dp);
 820
 821                 exynos_dp_read_byte_from_dpcd(dp,
 822                         DPCD_ADDR_TRAINING_PATTERN_SET,
 823                         &data);
 824                 exynos_dp_write_byte_to_dpcd(dp,
 825                         DPCD_ADDR_TRAINING_PATTERN_SET,
 826                         (u8)(data & ~DPCD_SCRAMBLING_DISABLED));
 827         } else {
 828                 exynos_dp_disable_scrambling(dp);
 829
 830                 exynos_dp_read_byte_from_dpcd(dp,
 831                         DPCD_ADDR_TRAINING_PATTERN_SET,
 832                         &data);
 833                 exynos_dp_write_byte_to_dpcd(dp,
 834                         DPCD_ADDR_TRAINING_PATTERN_SET,
 835                         (u8)(data | DPCD_SCRAMBLING_DISABLED));
 836         }
 837 }
 838
 839 static irqreturn_t exynos_dp_irq_handler(int irq, void *arg)
 840 {
 841         struct exynos_dp_device *dp = arg;
 842
 843         enum dp_irq_type irq_type;
 844
 845         irq_type = exynos_dp_get_irq_type(dp);
 846         switch (irq_type) {
 847         case DP_IRQ_TYPE_HP_CABLE_IN:
 848                 dev_dbg(dp->dev, "Received irq - cable in\n");
 849                 schedule_work(&dp->hotplug_work);
 850                 exynos_dp_clear_hotplug_interrupts(dp);
 851                 break;
 852         case DP_IRQ_TYPE_HP_CABLE_OUT:
 853                 dev_dbg(dp->dev, "Received irq - cable out\n");
 854                 exynos_dp_clear_hotplug_interrupts(dp);
 855                 break;
 856         case DP_IRQ_TYPE_HP_CHANGE:
 857                 /*
 858                  * We get these change notifications once in a while, but there
 859                  * is nothing we can do with them. Just ignore it for now and
 860                  * only handle cable changes.
 861                  */
 862                 dev_dbg(dp->dev, "Received irq - hotplug change; ignoring.\n");
 863                 exynos_dp_clear_hotplug_interrupts(dp);
 864                 break;
 865         default:
 866                 dev_err(dp->dev, "Received irq - unknown type!\n");
 867                 break;
 868         }
 869         return IRQ_HANDLED;
 870 }
 871
 872 static void exynos_dp_hotplug(struct work_struct *work)
 873 {
 874         struct exynos_dp_device *dp;
 875         int ret;
 876
 877         dp = container_of(work, struct exynos_dp_device, hotplug_work);
 878
 879         ret = exynos_dp_detect_hpd(dp);
 880         if (ret) {
 881                 /* Cable has been disconnected, we're done */
 882                 return;
 883         }
 884
 885         ret = exynos_dp_handle_edid(dp);
 886         if (ret) {
 887                 dev_err(dp->dev, "unable to handle edid\n");
 888                 return;
 889         }
 890
 891         ret = exynos_dp_set_link_train(dp, dp->video_info->lane_count,
 892                                         dp->video_info->link_rate);
 893         if (ret) {
 894                 dev_err(dp->dev, "unable to do link train\n");
 895                 return;
 896         }
 897
 898         exynos_dp_enable_scramble(dp, 1);
 899         exynos_dp_enable_rx_to_enhanced_mode(dp, 1);
 900         exynos_dp_enable_enhanced_mode(dp, 1);
 901
 902         exynos_dp_set_lane_count(dp, dp->video_info->lane_count);
 903         exynos_dp_set_link_bandwidth(dp, dp->video_info->link_rate);
 904
 905         exynos_dp_init_video(dp);
 906         ret = exynos_dp_config_video(dp);
 907         if (ret)
 908                 dev_err(dp->dev, "unable to config video\n");
 909 }
 910
 911 static enum drm_connector_status exynos_dp_detect(
 912                                 struct drm_connector *connector, bool force)
 913 {
 914         return connector_status_connected;
 915 }
 916
 917 static void exynos_dp_connector_destroy(struct drm_connector *connector)
 918 {
 919 }
 920
 921 static struct drm_connector_funcs exynos_dp_connector_funcs = {
 922         .dpms = drm_helper_connector_dpms,
 923         .fill_modes = drm_helper_probe_single_connector_modes,
 924         .detect = exynos_dp_detect,
 925         .destroy = exynos_dp_connector_destroy,
 926 };
 927
 928 static int exynos_dp_get_modes(struct drm_connector *connector)
 929 {
 930         struct exynos_dp_device *dp = ctx_from_connector(connector);
 931         struct drm_display_mode *mode;
 932
 933         mode = drm_mode_create(connector->dev);
 934         if (!mode) {
 935                 DRM_ERROR("failed to create a new display mode.\n");
 936                 return 0;
 937         }
 938
 939         drm_display_mode_from_videomode(&dp->panel.vm, mode);
 940         mode->width_mm = dp->panel.width_mm;
 941         mode->height_mm = dp->panel.height_mm;
 942         connector->display_info.width_mm = mode->width_mm;
 943         connector->display_info.height_mm = mode->height_mm;
 944
 945         mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 946         drm_mode_set_name(mode);
 947         drm_mode_probed_add(connector, mode);
 948
 949         return 1;
 950 }
 951
 952 static struct drm_encoder *exynos_dp_best_encoder(
 953                         struct drm_connector *connector)
 954 {
 955         struct exynos_dp_device *dp = ctx_from_connector(connector);
 956
 957         return dp->encoder;
 958 }
 959
 960 static struct drm_connector_helper_funcs exynos_dp_connector_helper_funcs = {
 961         .get_modes = exynos_dp_get_modes,
 962         .best_encoder = exynos_dp_best_encoder,
 963 };
 964
 965 static int exynos_dp_initialize(struct exynos_drm_display *display,
 966                                 struct drm_device *drm_dev)
 967 {
 968         struct exynos_dp_device *dp = display->ctx;
 969
 970         dp->drm_dev = drm_dev;
 971
 972         return 0;
 973 }
 974
 975 static bool find_bridge(const char *compat, struct bridge_init *bridge)
 976 {
 977         bridge->client = NULL;
 978         bridge->node = of_find_compatible_node(NULL, NULL, compat);
 979         if (!bridge->node)
 980                 return false;
 981
 982         bridge->client = of_find_i2c_device_by_node(bridge->node);
 983         if (!bridge->client)
 984                 return false;
 985
 986         return true;
 987 }
 988
 989 /* returns the number of bridges attached */
 990 static int exynos_drm_attach_lcd_bridge(struct drm_device *dev,
 991                 struct drm_encoder *encoder)
 992 {
 993         struct bridge_init bridge;
 994         int ret;
 995
 996         if (find_bridge("nxp,ptn3460", &bridge)) {
 997                 ret = ptn3460_init(dev, encoder, bridge.client, bridge.node);
 998                 if (!ret)
 999                         return 1;
1000         }
1001         return 0;
1002 }
1003
1004 static int exynos_dp_create_connector(struct exynos_drm_display *display,
1005                                 struct drm_encoder *encoder)
1006 {
1007         struct exynos_dp_device *dp = display->ctx;
1008         struct drm_connector *connector = &dp->connector;
1009         int ret;
1010
1011         dp->encoder = encoder;
1012
1013         /* Pre-empt DP connector creation if there's a bridge */
1014         ret = exynos_drm_attach_lcd_bridge(dp->drm_dev, encoder);
1015         if (ret)
1016                 return 0;
1017
1018         connector->polled = DRM_CONNECTOR_POLL_HPD;
1019
1020         ret = drm_connector_init(dp->drm_dev, connector,
1021                         &exynos_dp_connector_funcs, DRM_MODE_CONNECTOR_eDP);
1022         if (ret) {
1023                 DRM_ERROR("Failed to initialize connector with drm\n");
1024                 return ret;
1025         }
1026
1027         drm_connector_helper_add(connector, &exynos_dp_connector_helper_funcs);
1028         drm_sysfs_connector_add(connector);
1029         drm_mode_connector_attach_encoder(connector, encoder);
1030
1031         return 0;
1032 }
1033
1034 static void exynos_dp_phy_init(struct exynos_dp_device *dp)
1035 {
1036         if (dp->phy) {
1037                 phy_power_on(dp->phy);
1038         } else if (dp->phy_addr) {
1039                 u32 reg;
1040
1041                 reg = __raw_readl(dp->phy_addr);
1042                 reg |= dp->enable_mask;
1043                 __raw_writel(reg, dp->phy_addr);
1044         }
1045 }
1046
1047 static void exynos_dp_phy_exit(struct exynos_dp_device *dp)
1048 {
1049         if (dp->phy) {
1050                 phy_power_off(dp->phy);
1051         } else if (dp->phy_addr) {
1052                 u32 reg;
1053
1054                 reg = __raw_readl(dp->phy_addr);
1055                 reg &= ~(dp->enable_mask);
1056                 __raw_writel(reg, dp->phy_addr);
1057         }
1058 }
1059
1060 static void exynos_dp_poweron(struct exynos_dp_device *dp)
1061 {
1062         if (dp->dpms_mode == DRM_MODE_DPMS_ON)
1063                 return;
1064
1065         clk_prepare_enable(dp->clock);
1066         exynos_dp_phy_init(dp);
1067         exynos_dp_init_dp(dp);
1068         enable_irq(dp->irq);
1069 }
1070
1071 static void exynos_dp_poweroff(struct exynos_dp_device *dp)
1072 {
1073         if (dp->dpms_mode != DRM_MODE_DPMS_ON)
1074                 return;
1075
1076         disable_irq(dp->irq);
1077         flush_work(&dp->hotplug_work);
1078         exynos_dp_phy_exit(dp);
1079         clk_disable_unprepare(dp->clock);
1080 }
1081
1082 static void exynos_dp_dpms(struct exynos_drm_display *display, int mode)
1083 {
1084         struct exynos_dp_device *dp = display->ctx;
1085
1086         switch (mode) {
1087         case DRM_MODE_DPMS_ON:
1088                 exynos_dp_poweron(dp);
1089                 break;
1090         case DRM_MODE_DPMS_STANDBY:
1091         case DRM_MODE_DPMS_SUSPEND:
1092         case DRM_MODE_DPMS_OFF:
1093                 exynos_dp_poweroff(dp);
1094                 break;
1095         default:
1096                 break;
1097         };
1098         dp->dpms_mode = mode;
1099 }
1100
1101 static struct exynos_drm_display_ops exynos_dp_display_ops = {
1102         .initialize = exynos_dp_initialize,
1103         .create_connector = exynos_dp_create_connector,
1104         .dpms = exynos_dp_dpms,
1105 };
1106
1107 static struct exynos_drm_display exynos_dp_display = {
1108         .type = EXYNOS_DISPLAY_TYPE_LCD,
1109         .ops = &exynos_dp_display_ops,
1110 };
1111
1112 static struct video_info *exynos_dp_dt_parse_pdata(struct device *dev)
1113 {
1114         struct device_node *dp_node = dev->of_node;
1115         struct video_info *dp_video_config;
1116
1117         dp_video_config = devm_kzalloc(dev,
1118                                 sizeof(*dp_video_config), GFP_KERNEL);
1119         if (!dp_video_config)
1120                 return ERR_PTR(-ENOMEM);
1121
1122         dp_video_config->h_sync_polarity =
1123                 of_property_read_bool(dp_node, "hsync-active-high");
1124
1125         dp_video_config->v_sync_polarity =
1126                 of_property_read_bool(dp_node, "vsync-active-high");
1127
1128         dp_video_config->interlaced =
1129                 of_property_read_bool(dp_node, "interlaced");
1130
1131         if (of_property_read_u32(dp_node, "samsung,color-space",
1132                                 &dp_video_config->color_space)) {
1133                 dev_err(dev, "failed to get color-space\n");
1134                 return ERR_PTR(-EINVAL);
1135         }
1136
1137         if (of_property_read_u32(dp_node, "samsung,dynamic-range",
1138                                 &dp_video_config->dynamic_range)) {
1139                 dev_err(dev, "failed to get dynamic-range\n");
1140                 return ERR_PTR(-EINVAL);
1141         }
1142
1143         if (of_property_read_u32(dp_node, "samsung,ycbcr-coeff",
1144                                 &dp_video_config->ycbcr_coeff)) {
1145                 dev_err(dev, "failed to get ycbcr-coeff\n");
1146                 return ERR_PTR(-EINVAL);
1147         }
1148
1149         if (of_property_read_u32(dp_node, "samsung,color-depth",
1150                                 &dp_video_config->color_depth)) {
1151                 dev_err(dev, "failed to get color-depth\n");
1152                 return ERR_PTR(-EINVAL);
1153         }
1154
1155         if (of_property_read_u32(dp_node, "samsung,link-rate",
1156                                 &dp_video_config->link_rate)) {
1157                 dev_err(dev, "failed to get link-rate\n");
1158                 return ERR_PTR(-EINVAL);
1159         }
1160
1161         if (of_property_read_u32(dp_node, "samsung,lane-count",
1162                                 &dp_video_config->lane_count)) {
1163                 dev_err(dev, "failed to get lane-count\n");
1164                 return ERR_PTR(-EINVAL);
1165         }
1166
1167         return dp_video_config;
1168 }
1169
1170 static int exynos_dp_dt_parse_phydata(struct exynos_dp_device *dp)
1171 {
1172         struct device_node *dp_phy_node = of_node_get(dp->dev->of_node);
1173         u32 phy_base;
1174         int ret = 0;
1175
1176         dp_phy_node = of_find_node_by_name(dp_phy_node, "dptx-phy");
1177         if (!dp_phy_node) {
1178                 dp->phy = devm_phy_get(dp->dev, "dp");
1179                 if (IS_ERR(dp->phy))
1180                         return PTR_ERR(dp->phy);
1181                 else
1182                         return 0;
1183         }
1184
1185         if (of_property_read_u32(dp_phy_node, "reg", &phy_base)) {
1186                 dev_err(dp->dev, "failed to get reg for dptx-phy\n");
1187                 ret = -EINVAL;
1188                 goto err;
1189         }
1190
1191         if (of_property_read_u32(dp_phy_node, "samsung,enable-mask",
1192                                 &dp->enable_mask)) {
1193                 dev_err(dp->dev, "failed to get enable-mask for dptx-phy\n");
1194                 ret = -EINVAL;
1195                 goto err;
1196         }
1197
1198         dp->phy_addr = ioremap(phy_base, SZ_4);
1199         if (!dp->phy_addr) {
1200                 dev_err(dp->dev, "failed to ioremap dp-phy\n");
1201                 ret = -ENOMEM;
1202                 goto err;
1203         }
1204
1205 err:
1206         of_node_put(dp_phy_node);
1207
1208         return ret;
1209 }
1210
1211 static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp)
1212 {
1213         int ret;
1214
1215         ret = of_get_videomode(dp->dev->of_node, &dp->panel.vm,
1216                         OF_USE_NATIVE_MODE);
1217         if (ret) {
1218                 DRM_ERROR("failed: of_get_videomode() : %d\n", ret);
1219                 return ret;
1220         }
1221         return 0;
1222 }
1223
1224 static int exynos_dp_probe(struct platform_device *pdev)
1225 {
1226         struct resource *res;
1227         struct exynos_dp_device *dp;
1228
1229         int ret = 0;
1230
1231         dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device),
1232                                 GFP_KERNEL);
1233         if (!dp)
1234                 return -ENOMEM;
1235
1236         dp->dev = &pdev->dev;
1237         dp->dpms_mode = DRM_MODE_DPMS_OFF;
1238
1239         dp->video_info = exynos_dp_dt_parse_pdata(&pdev->dev);
1240         if (IS_ERR(dp->video_info))
1241                 return PTR_ERR(dp->video_info);
1242
1243         ret = exynos_dp_dt_parse_phydata(dp);
1244         if (ret)
1245                 return ret;
1246
1247         ret = exynos_dp_dt_parse_panel(dp);
1248         if (ret)
1249                 return ret;
1250
1251         dp->clock = devm_clk_get(&pdev->dev, "dp");
1252         if (IS_ERR(dp->clock)) {
1253                 dev_err(&pdev->dev, "failed to get clock\n");
1254                 return PTR_ERR(dp->clock);
1255         }
1256
1257         clk_prepare_enable(dp->clock);
1258
1259         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1260
1261         dp->reg_base = devm_ioremap_resource(&pdev->dev, res);
1262         if (IS_ERR(dp->reg_base))
1263                 return PTR_ERR(dp->reg_base);
1264
1265         dp->irq = platform_get_irq(pdev, 0);
1266         if (dp->irq == -ENXIO) {
1267                 dev_err(&pdev->dev, "failed to get irq\n");
1268                 return -ENODEV;
1269         }
1270
1271         INIT_WORK(&dp->hotplug_work, exynos_dp_hotplug);
1272
1273         exynos_dp_phy_init(dp);
1274
1275         exynos_dp_init_dp(dp);
1276
1277         ret = devm_request_irq(&pdev->dev, dp->irq, exynos_dp_irq_handler, 0,
1278                                 "exynos-dp", dp);
1279         if (ret) {
1280                 dev_err(&pdev->dev, "failed to request irq\n");
1281                 return ret;
1282         }
1283         disable_irq(dp->irq);
1284
1285         exynos_dp_display.ctx = dp;
1286
1287         platform_set_drvdata(pdev, &exynos_dp_display);
1288         exynos_drm_display_register(&exynos_dp_display);
1289
1290         return 0;
1291 }
1292
1293 static int exynos_dp_remove(struct platform_device *pdev)
1294 {
1295         struct exynos_drm_display *display = platform_get_drvdata(pdev);
1296
1297         exynos_dp_dpms(display, DRM_MODE_DPMS_OFF);
1298         exynos_drm_display_unregister(&exynos_dp_display);
1299
1300         return 0;
1301 }
1302
1303 #ifdef CONFIG_PM_SLEEP
1304 static int exynos_dp_suspend(struct device *dev)
1305 {
1306         struct platform_device *pdev = to_platform_device(dev);
1307         struct exynos_drm_display *display = platform_get_drvdata(pdev);
1308
1309         exynos_dp_dpms(display, DRM_MODE_DPMS_OFF);
1310         return 0;
1311 }
1312
1313 static int exynos_dp_resume(struct device *dev)
1314 {
1315         struct platform_device *pdev = to_platform_device(dev);
1316         struct exynos_drm_display *display = platform_get_drvdata(pdev);
1317
1318         exynos_dp_dpms(display, DRM_MODE_DPMS_ON);
1319         return 0;
1320 }
1321 #endif
1322
1323 static const struct dev_pm_ops exynos_dp_pm_ops = {
1324         SET_SYSTEM_SLEEP_PM_OPS(exynos_dp_suspend, exynos_dp_resume)
1325 };
1326
1327 static const struct of_device_id exynos_dp_match[] = {
1328         { .compatible = "samsung,exynos5-dp" },
1329         {},
1330 };
1331
1332 struct platform_driver dp_driver = {
1333         .probe          = exynos_dp_probe,
1334         .remove         = exynos_dp_remove,
1335         .driver         = {
1336                 .name   = "exynos-dp",
1337                 .owner  = THIS_MODULE,
1338                 .pm     = &exynos_dp_pm_ops,
1339                 .of_match_table = exynos_dp_match,
1340         },
1341 };
1342
1343 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
1344 MODULE_DESCRIPTION("Samsung SoC DP Driver");
1345 MODULE_LICENSE("GPL");