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/of.h>
  20 #include <linux/of_gpio.h>
  21 #include <linux/gpio.h>
  22 #include <linux/component.h>
  23 #include <linux/phy/phy.h>
  24 #include <video/of_display_timing.h>
  25 #include <video/of_videomode.h>
  26
  27 #include <drm/drmP.h>
  28 #include <drm/drm_crtc.h>
  29 #include <drm/drm_crtc_helper.h>
  30 #include <drm/drm_panel.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 void 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
  63 static int exynos_dp_detect_hpd(struct exynos_dp_device *dp)
  64 {
  65         int timeout_loop = 0;
  66
  67         while (exynos_dp_get_plug_in_status(dp) != 0) {
  68                 timeout_loop++;
  69                 if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) {
  70                         dev_err(dp->dev, "failed to get hpd plug status\n");
  71                         return -ETIMEDOUT;
  72                 }
  73                 usleep_range(10, 11);
  74         }
  75
  76         return 0;
  77 }
  78
  79 static unsigned char exynos_dp_calc_edid_check_sum(unsigned char *edid_data)
  80 {
  81         int i;
  82         unsigned char sum = 0;
  83
  84         for (i = 0; i < EDID_BLOCK_LENGTH; i++)
  85                 sum = sum + edid_data[i];
  86
  87         return sum;
  88 }
  89
  90 static int exynos_dp_read_edid(struct exynos_dp_device *dp)
  91 {
  92         unsigned char edid[EDID_BLOCK_LENGTH * 2];
  93         unsigned int extend_block = 0;
  94         unsigned char sum;
  95         unsigned char test_vector;
  96         int retval;
  97
  98         /*
  99          * EDID device address is 0x50.
 100          * However, if necessary, you must have set upper address
 101          * into E-EDID in I2C device, 0x30.
 102          */
 103
 104         /* Read Extension Flag, Number of 128-byte EDID extension blocks */
 105         retval = exynos_dp_read_byte_from_i2c(dp, I2C_EDID_DEVICE_ADDR,
 106                                 EDID_EXTENSION_FLAG,
 107                                 &extend_block);
 108         if (retval)
 109                 return retval;
 110
 111         if (extend_block > 0) {
 112                 dev_dbg(dp->dev, "EDID data includes a single extension!\n");
 113
 114                 /* Read EDID data */
 115                 retval = exynos_dp_read_bytes_from_i2c(dp, I2C_EDID_DEVICE_ADDR,
 116                                                 EDID_HEADER_PATTERN,
 117                                                 EDID_BLOCK_LENGTH,
 118                                                 &edid[EDID_HEADER_PATTERN]);
 119                 if (retval != 0) {
 120                         dev_err(dp->dev, "EDID Read failed!\n");
 121                         return -EIO;
 122                 }
 123                 sum = exynos_dp_calc_edid_check_sum(edid);
 124                 if (sum != 0) {
 125                         dev_err(dp->dev, "EDID bad checksum!\n");
 126                         return -EIO;
 127                 }
 128
 129                 /* Read additional EDID data */
 130                 retval = exynos_dp_read_bytes_from_i2c(dp,
 131                                 I2C_EDID_DEVICE_ADDR,
 132                                 EDID_BLOCK_LENGTH,
 133                                 EDID_BLOCK_LENGTH,
 134                                 &edid[EDID_BLOCK_LENGTH]);
 135                 if (retval != 0) {
 136                         dev_err(dp->dev, "EDID Read failed!\n");
 137                         return -EIO;
 138                 }
 139                 sum = exynos_dp_calc_edid_check_sum(&edid[EDID_BLOCK_LENGTH]);
 140                 if (sum != 0) {
 141                         dev_err(dp->dev, "EDID bad checksum!\n");
 142                         return -EIO;
 143                 }
 144
 145                 exynos_dp_read_byte_from_dpcd(dp, DP_TEST_REQUEST,
 146                                         &test_vector);
 147                 if (test_vector & DP_TEST_LINK_EDID_READ) {
 148                         exynos_dp_write_byte_to_dpcd(dp,
 149                                 DP_TEST_EDID_CHECKSUM,
 150                                 edid[EDID_BLOCK_LENGTH + EDID_CHECKSUM]);
 151                         exynos_dp_write_byte_to_dpcd(dp,
 152                                 DP_TEST_RESPONSE,
 153                                 DP_TEST_EDID_CHECKSUM_WRITE);
 154                 }
 155         } else {
 156                 dev_info(dp->dev, "EDID data does not include any extensions.\n");
 157
 158                 /* Read EDID data */
 159                 retval = exynos_dp_read_bytes_from_i2c(dp,
 160                                 I2C_EDID_DEVICE_ADDR,
 161                                 EDID_HEADER_PATTERN,
 162                                 EDID_BLOCK_LENGTH,
 163                                 &edid[EDID_HEADER_PATTERN]);
 164                 if (retval != 0) {
 165                         dev_err(dp->dev, "EDID Read failed!\n");
 166                         return -EIO;
 167                 }
 168                 sum = exynos_dp_calc_edid_check_sum(edid);
 169                 if (sum != 0) {
 170                         dev_err(dp->dev, "EDID bad checksum!\n");
 171                         return -EIO;
 172                 }
 173
 174                 exynos_dp_read_byte_from_dpcd(dp,
 175                         DP_TEST_REQUEST,
 176                         &test_vector);
 177                 if (test_vector & DP_TEST_LINK_EDID_READ) {
 178                         exynos_dp_write_byte_to_dpcd(dp,
 179                                 DP_TEST_EDID_CHECKSUM,
 180                                 edid[EDID_CHECKSUM]);
 181                         exynos_dp_write_byte_to_dpcd(dp,
 182                                 DP_TEST_RESPONSE,
 183                                 DP_TEST_EDID_CHECKSUM_WRITE);
 184                 }
 185         }
 186
 187         dev_err(dp->dev, "EDID Read success!\n");
 188         return 0;
 189 }
 190
 191 static int exynos_dp_handle_edid(struct exynos_dp_device *dp)
 192 {
 193         u8 buf[12];
 194         int i;
 195         int retval;
 196
 197         /* Read DPCD DP_DPCD_REV~RECEIVE_PORT1_CAP_1 */
 198         retval = exynos_dp_read_bytes_from_dpcd(dp, DP_DPCD_REV,
 199                                 12, buf);
 200         if (retval)
 201                 return retval;
 202
 203         /* Read EDID */
 204         for (i = 0; i < 3; i++) {
 205                 retval = exynos_dp_read_edid(dp);
 206                 if (!retval)
 207                         break;
 208         }
 209
 210         return retval;
 211 }
 212
 213 static void exynos_dp_enable_rx_to_enhanced_mode(struct exynos_dp_device *dp,
 214                                                 bool enable)
 215 {
 216         u8 data;
 217
 218         exynos_dp_read_byte_from_dpcd(dp, DP_LANE_COUNT_SET, &data);
 219
 220         if (enable)
 221                 exynos_dp_write_byte_to_dpcd(dp, DP_LANE_COUNT_SET,
 222                         DP_LANE_COUNT_ENHANCED_FRAME_EN |
 223                         DPCD_LANE_COUNT_SET(data));
 224         else
 225                 exynos_dp_write_byte_to_dpcd(dp, DP_LANE_COUNT_SET,
 226                         DPCD_LANE_COUNT_SET(data));
 227 }
 228
 229 static int exynos_dp_is_enhanced_mode_available(struct exynos_dp_device *dp)
 230 {
 231         u8 data;
 232         int retval;
 233
 234         exynos_dp_read_byte_from_dpcd(dp, DP_MAX_LANE_COUNT, &data);
 235         retval = DPCD_ENHANCED_FRAME_CAP(data);
 236
 237         return retval;
 238 }
 239
 240 static void exynos_dp_set_enhanced_mode(struct exynos_dp_device *dp)
 241 {
 242         u8 data;
 243
 244         data = exynos_dp_is_enhanced_mode_available(dp);
 245         exynos_dp_enable_rx_to_enhanced_mode(dp, data);
 246         exynos_dp_enable_enhanced_mode(dp, data);
 247 }
 248
 249 static void exynos_dp_training_pattern_dis(struct exynos_dp_device *dp)
 250 {
 251         exynos_dp_set_training_pattern(dp, DP_NONE);
 252
 253         exynos_dp_write_byte_to_dpcd(dp,
 254                 DP_TRAINING_PATTERN_SET,
 255                 DP_TRAINING_PATTERN_DISABLE);
 256 }
 257
 258 static void exynos_dp_set_lane_lane_pre_emphasis(struct exynos_dp_device *dp,
 259                                         int pre_emphasis, int lane)
 260 {
 261         switch (lane) {
 262         case 0:
 263                 exynos_dp_set_lane0_pre_emphasis(dp, pre_emphasis);
 264                 break;
 265         case 1:
 266                 exynos_dp_set_lane1_pre_emphasis(dp, pre_emphasis);
 267                 break;
 268
 269         case 2:
 270                 exynos_dp_set_lane2_pre_emphasis(dp, pre_emphasis);
 271                 break;
 272
 273         case 3:
 274                 exynos_dp_set_lane3_pre_emphasis(dp, pre_emphasis);
 275                 break;
 276         }
 277 }
 278
 279 static int exynos_dp_link_start(struct exynos_dp_device *dp)
 280 {
 281         u8 buf[4];
 282         int lane, lane_count, pll_tries, retval;
 283
 284         lane_count = dp->link_train.lane_count;
 285
 286         dp->link_train.lt_state = CLOCK_RECOVERY;
 287         dp->link_train.eq_loop = 0;
 288
 289         for (lane = 0; lane < lane_count; lane++)
 290                 dp->link_train.cr_loop[lane] = 0;
 291
 292         /* Set link rate and count as you want to establish*/
 293         exynos_dp_set_link_bandwidth(dp, dp->link_train.link_rate);
 294         exynos_dp_set_lane_count(dp, dp->link_train.lane_count);
 295
 296         /* Setup RX configuration */
 297         buf[0] = dp->link_train.link_rate;
 298         buf[1] = dp->link_train.lane_count;
 299         retval = exynos_dp_write_bytes_to_dpcd(dp, DP_LINK_BW_SET,
 300                                 2, buf);
 301         if (retval)
 302                 return retval;
 303
 304         /* Set TX pre-emphasis to minimum */
 305         for (lane = 0; lane < lane_count; lane++)
 306                 exynos_dp_set_lane_lane_pre_emphasis(dp,
 307                         PRE_EMPHASIS_LEVEL_0, lane);
 308
 309         /* Wait for PLL lock */
 310         pll_tries = 0;
 311         while (exynos_dp_get_pll_lock_status(dp) == PLL_UNLOCKED) {
 312                 if (pll_tries == DP_TIMEOUT_LOOP_COUNT) {
 313                         dev_err(dp->dev, "Wait for PLL lock timed out\n");
 314                         return -ETIMEDOUT;
 315                 }
 316
 317                 pll_tries++;
 318                 usleep_range(90, 120);
 319         }
 320
 321         /* Set training pattern 1 */
 322         exynos_dp_set_training_pattern(dp, TRAINING_PTN1);
 323
 324         /* Set RX training pattern */
 325         retval = exynos_dp_write_byte_to_dpcd(dp,
 326                         DP_TRAINING_PATTERN_SET,
 327                         DP_LINK_SCRAMBLING_DISABLE | DP_TRAINING_PATTERN_1);
 328         if (retval)
 329                 return retval;
 330
 331         for (lane = 0; lane < lane_count; lane++)
 332                 buf[lane] = DP_TRAIN_PRE_EMPH_LEVEL_0 |
 333                             DP_TRAIN_VOLTAGE_SWING_LEVEL_0;
 334
 335         retval = exynos_dp_write_bytes_to_dpcd(dp, DP_TRAINING_LANE0_SET,
 336                         lane_count, buf);
 337
 338         return retval;
 339 }
 340
 341 static unsigned char exynos_dp_get_lane_status(u8 link_status[2], int lane)
 342 {
 343         int shift = (lane & 1) * 4;
 344         u8 link_value = link_status[lane>>1];
 345
 346         return (link_value >> shift) & 0xf;
 347 }
 348
 349 static int exynos_dp_clock_recovery_ok(u8 link_status[2], int lane_count)
 350 {
 351         int lane;
 352         u8 lane_status;
 353
 354         for (lane = 0; lane < lane_count; lane++) {
 355                 lane_status = exynos_dp_get_lane_status(link_status, lane);
 356                 if ((lane_status & DP_LANE_CR_DONE) == 0)
 357                         return -EINVAL;
 358         }
 359         return 0;
 360 }
 361
 362 static int exynos_dp_channel_eq_ok(u8 link_status[2], u8 link_align,
 363                                 int lane_count)
 364 {
 365         int lane;
 366         u8 lane_status;
 367
 368         if ((link_align & DP_INTERLANE_ALIGN_DONE) == 0)
 369                 return -EINVAL;
 370
 371         for (lane = 0; lane < lane_count; lane++) {
 372                 lane_status = exynos_dp_get_lane_status(link_status, lane);
 373                 lane_status &= DP_CHANNEL_EQ_BITS;
 374                 if (lane_status != DP_CHANNEL_EQ_BITS)
 375                         return -EINVAL;
 376         }
 377
 378         return 0;
 379 }
 380
 381 static unsigned char exynos_dp_get_adjust_request_voltage(u8 adjust_request[2],
 382                                                         int lane)
 383 {
 384         int shift = (lane & 1) * 4;
 385         u8 link_value = adjust_request[lane>>1];
 386
 387         return (link_value >> shift) & 0x3;
 388 }
 389
 390 static unsigned char exynos_dp_get_adjust_request_pre_emphasis(
 391                                         u8 adjust_request[2],
 392                                         int lane)
 393 {
 394         int shift = (lane & 1) * 4;
 395         u8 link_value = adjust_request[lane>>1];
 396
 397         return ((link_value >> shift) & 0xc) >> 2;
 398 }
 399
 400 static void exynos_dp_set_lane_link_training(struct exynos_dp_device *dp,
 401                                         u8 training_lane_set, int lane)
 402 {
 403         switch (lane) {
 404         case 0:
 405                 exynos_dp_set_lane0_link_training(dp, training_lane_set);
 406                 break;
 407         case 1:
 408                 exynos_dp_set_lane1_link_training(dp, training_lane_set);
 409                 break;
 410
 411         case 2:
 412                 exynos_dp_set_lane2_link_training(dp, training_lane_set);
 413                 break;
 414
 415         case 3:
 416                 exynos_dp_set_lane3_link_training(dp, training_lane_set);
 417                 break;
 418         }
 419 }
 420
 421 static unsigned int exynos_dp_get_lane_link_training(
 422                                 struct exynos_dp_device *dp,
 423                                 int lane)
 424 {
 425         u32 reg;
 426
 427         switch (lane) {
 428         case 0:
 429                 reg = exynos_dp_get_lane0_link_training(dp);
 430                 break;
 431         case 1:
 432                 reg = exynos_dp_get_lane1_link_training(dp);
 433                 break;
 434         case 2:
 435                 reg = exynos_dp_get_lane2_link_training(dp);
 436                 break;
 437         case 3:
 438                 reg = exynos_dp_get_lane3_link_training(dp);
 439                 break;
 440         default:
 441                 WARN_ON(1);
 442                 return 0;
 443         }
 444
 445         return reg;
 446 }
 447
 448 static void exynos_dp_reduce_link_rate(struct exynos_dp_device *dp)
 449 {
 450         exynos_dp_training_pattern_dis(dp);
 451         exynos_dp_set_enhanced_mode(dp);
 452
 453         dp->link_train.lt_state = FAILED;
 454 }
 455
 456 static void exynos_dp_get_adjust_training_lane(struct exynos_dp_device *dp,
 457                                         u8 adjust_request[2])
 458 {
 459         int lane, lane_count;
 460         u8 voltage_swing, pre_emphasis, training_lane;
 461
 462         lane_count = dp->link_train.lane_count;
 463         for (lane = 0; lane < lane_count; lane++) {
 464                 voltage_swing = exynos_dp_get_adjust_request_voltage(
 465                                                 adjust_request, lane);
 466                 pre_emphasis = exynos_dp_get_adjust_request_pre_emphasis(
 467                                                 adjust_request, lane);
 468                 training_lane = DPCD_VOLTAGE_SWING_SET(voltage_swing) |
 469                                 DPCD_PRE_EMPHASIS_SET(pre_emphasis);
 470
 471                 if (voltage_swing == VOLTAGE_LEVEL_3)
 472                         training_lane |= DP_TRAIN_MAX_SWING_REACHED;
 473                 if (pre_emphasis == PRE_EMPHASIS_LEVEL_3)
 474                         training_lane |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
 475
 476                 dp->link_train.training_lane[lane] = training_lane;
 477         }
 478 }
 479
 480 static int exynos_dp_process_clock_recovery(struct exynos_dp_device *dp)
 481 {
 482         int lane, lane_count, retval;
 483         u8 voltage_swing, pre_emphasis, training_lane;
 484         u8 link_status[2], adjust_request[2];
 485
 486         usleep_range(100, 101);
 487
 488         lane_count = dp->link_train.lane_count;
 489
 490         retval =  exynos_dp_read_bytes_from_dpcd(dp,
 491                         DP_LANE0_1_STATUS, 2, link_status);
 492         if (retval)
 493                 return retval;
 494
 495         retval =  exynos_dp_read_bytes_from_dpcd(dp,
 496                         DP_ADJUST_REQUEST_LANE0_1, 2, adjust_request);
 497         if (retval)
 498                 return retval;
 499
 500         if (exynos_dp_clock_recovery_ok(link_status, lane_count) == 0) {
 501                 /* set training pattern 2 for EQ */
 502                 exynos_dp_set_training_pattern(dp, TRAINING_PTN2);
 503
 504                 retval = exynos_dp_write_byte_to_dpcd(dp,
 505                                 DP_TRAINING_PATTERN_SET,
 506                                 DP_LINK_SCRAMBLING_DISABLE |
 507                                 DP_TRAINING_PATTERN_2);
 508                 if (retval)
 509                         return retval;
 510
 511                 dev_info(dp->dev, "Link Training Clock Recovery success\n");
 512                 dp->link_train.lt_state = EQUALIZER_TRAINING;
 513         } else {
 514                 for (lane = 0; lane < lane_count; lane++) {
 515                         training_lane = exynos_dp_get_lane_link_training(
 516                                                         dp, lane);
 517                         voltage_swing = exynos_dp_get_adjust_request_voltage(
 518                                                         adjust_request, lane);
 519                         pre_emphasis = exynos_dp_get_adjust_request_pre_emphasis(
 520                                                         adjust_request, lane);
 521
 522                         if (DPCD_VOLTAGE_SWING_GET(training_lane) ==
 523                                         voltage_swing &&
 524                             DPCD_PRE_EMPHASIS_GET(training_lane) ==
 525                                         pre_emphasis)
 526                                 dp->link_train.cr_loop[lane]++;
 527
 528                         if (dp->link_train.cr_loop[lane] == MAX_CR_LOOP ||
 529                             voltage_swing == VOLTAGE_LEVEL_3 ||
 530                             pre_emphasis == PRE_EMPHASIS_LEVEL_3) {
 531                                 dev_err(dp->dev, "CR Max reached (%d,%d,%d)\n",
 532                                         dp->link_train.cr_loop[lane],
 533                                         voltage_swing, pre_emphasis);
 534                                 exynos_dp_reduce_link_rate(dp);
 535                                 return -EIO;
 536                         }
 537                 }
 538         }
 539
 540         exynos_dp_get_adjust_training_lane(dp, adjust_request);
 541
 542         for (lane = 0; lane < lane_count; lane++)
 543                 exynos_dp_set_lane_link_training(dp,
 544                         dp->link_train.training_lane[lane], lane);
 545
 546         retval = exynos_dp_write_bytes_to_dpcd(dp,
 547                         DP_TRAINING_LANE0_SET, lane_count,
 548                         dp->link_train.training_lane);
 549         if (retval)
 550                 return retval;
 551
 552         return retval;
 553 }
 554
 555 static int exynos_dp_process_equalizer_training(struct exynos_dp_device *dp)
 556 {
 557         int lane, lane_count, retval;
 558         u32 reg;
 559         u8 link_align, link_status[2], adjust_request[2];
 560
 561         usleep_range(400, 401);
 562
 563         lane_count = dp->link_train.lane_count;
 564
 565         retval = exynos_dp_read_bytes_from_dpcd(dp,
 566                         DP_LANE0_1_STATUS, 2, link_status);
 567         if (retval)
 568                 return retval;
 569
 570         if (exynos_dp_clock_recovery_ok(link_status, lane_count)) {
 571                 exynos_dp_reduce_link_rate(dp);
 572                 return -EIO;
 573         }
 574
 575         retval = exynos_dp_read_bytes_from_dpcd(dp,
 576                         DP_ADJUST_REQUEST_LANE0_1, 2, adjust_request);
 577         if (retval)
 578                 return retval;
 579
 580         retval = exynos_dp_read_byte_from_dpcd(dp,
 581                         DP_LANE_ALIGN_STATUS_UPDATED, &link_align);
 582         if (retval)
 583                 return retval;
 584
 585         exynos_dp_get_adjust_training_lane(dp, adjust_request);
 586
 587         if (!exynos_dp_channel_eq_ok(link_status, link_align, lane_count)) {
 588                 /* traing pattern Set to Normal */
 589                 exynos_dp_training_pattern_dis(dp);
 590
 591                 dev_info(dp->dev, "Link Training success!\n");
 592
 593                 exynos_dp_get_link_bandwidth(dp, &reg);
 594                 dp->link_train.link_rate = reg;
 595                 dev_dbg(dp->dev, "final bandwidth = %.2x\n",
 596                         dp->link_train.link_rate);
 597
 598                 exynos_dp_get_lane_count(dp, &reg);
 599                 dp->link_train.lane_count = reg;
 600                 dev_dbg(dp->dev, "final lane count = %.2x\n",
 601                         dp->link_train.lane_count);
 602
 603                 /* set enhanced mode if available */
 604                 exynos_dp_set_enhanced_mode(dp);
 605                 dp->link_train.lt_state = FINISHED;
 606
 607                 return 0;
 608         }
 609
 610         /* not all locked */
 611         dp->link_train.eq_loop++;
 612
 613         if (dp->link_train.eq_loop > MAX_EQ_LOOP) {
 614                 dev_err(dp->dev, "EQ Max loop\n");
 615                 exynos_dp_reduce_link_rate(dp);
 616                 return -EIO;
 617         }
 618
 619         for (lane = 0; lane < lane_count; lane++)
 620                 exynos_dp_set_lane_link_training(dp,
 621                         dp->link_train.training_lane[lane], lane);
 622
 623         retval = exynos_dp_write_bytes_to_dpcd(dp, DP_TRAINING_LANE0_SET,
 624                         lane_count, dp->link_train.training_lane);
 625
 626         return retval;
 627 }
 628
 629 static void exynos_dp_get_max_rx_bandwidth(struct exynos_dp_device *dp,
 630                                         u8 *bandwidth)
 631 {
 632         u8 data;
 633
 634         /*
 635          * For DP rev.1.1, Maximum link rate of Main Link lanes
 636          * 0x06 = 1.62 Gbps, 0x0a = 2.7 Gbps
 637          */
 638         exynos_dp_read_byte_from_dpcd(dp, DP_MAX_LINK_RATE, &data);
 639         *bandwidth = data;
 640 }
 641
 642 static void exynos_dp_get_max_rx_lane_count(struct exynos_dp_device *dp,
 643                                         u8 *lane_count)
 644 {
 645         u8 data;
 646
 647         /*
 648          * For DP rev.1.1, Maximum number of Main Link lanes
 649          * 0x01 = 1 lane, 0x02 = 2 lanes, 0x04 = 4 lanes
 650          */
 651         exynos_dp_read_byte_from_dpcd(dp, DP_MAX_LANE_COUNT, &data);
 652         *lane_count = DPCD_MAX_LANE_COUNT(data);
 653 }
 654
 655 static void exynos_dp_init_training(struct exynos_dp_device *dp,
 656                         enum link_lane_count_type max_lane,
 657                         enum link_rate_type max_rate)
 658 {
 659         /*
 660          * MACRO_RST must be applied after the PLL_LOCK to avoid
 661          * the DP inter pair skew issue for at least 10 us
 662          */
 663         exynos_dp_reset_macro(dp);
 664
 665         /* Initialize by reading RX's DPCD */
 666         exynos_dp_get_max_rx_bandwidth(dp, &dp->link_train.link_rate);
 667         exynos_dp_get_max_rx_lane_count(dp, &dp->link_train.lane_count);
 668
 669         if ((dp->link_train.link_rate != LINK_RATE_1_62GBPS) &&
 670            (dp->link_train.link_rate != LINK_RATE_2_70GBPS)) {
 671                 dev_err(dp->dev, "Rx Max Link Rate is abnormal :%x !\n",
 672                         dp->link_train.link_rate);
 673                 dp->link_train.link_rate = LINK_RATE_1_62GBPS;
 674         }
 675
 676         if (dp->link_train.lane_count == 0) {
 677                 dev_err(dp->dev, "Rx Max Lane count is abnormal :%x !\n",
 678                         dp->link_train.lane_count);
 679                 dp->link_train.lane_count = (u8)LANE_COUNT1;
 680         }
 681
 682         /* Setup TX lane count & rate */
 683         if (dp->link_train.lane_count > max_lane)
 684                 dp->link_train.lane_count = max_lane;
 685         if (dp->link_train.link_rate > max_rate)
 686                 dp->link_train.link_rate = max_rate;
 687
 688         /* All DP analog module power up */
 689         exynos_dp_set_analog_power_down(dp, POWER_ALL, 0);
 690 }
 691
 692 static int exynos_dp_sw_link_training(struct exynos_dp_device *dp)
 693 {
 694         int retval = 0, training_finished = 0;
 695
 696         dp->link_train.lt_state = START;
 697
 698         /* Process here */
 699         while (!retval && !training_finished) {
 700                 switch (dp->link_train.lt_state) {
 701                 case START:
 702                         retval = exynos_dp_link_start(dp);
 703                         if (retval)
 704                                 dev_err(dp->dev, "LT link start failed!\n");
 705                         break;
 706                 case CLOCK_RECOVERY:
 707                         retval = exynos_dp_process_clock_recovery(dp);
 708                         if (retval)
 709                                 dev_err(dp->dev, "LT CR failed!\n");
 710                         break;
 711                 case EQUALIZER_TRAINING:
 712                         retval = exynos_dp_process_equalizer_training(dp);
 713                         if (retval)
 714                                 dev_err(dp->dev, "LT EQ failed!\n");
 715                         break;
 716                 case FINISHED:
 717                         training_finished = 1;
 718                         break;
 719                 case FAILED:
 720                         return -EREMOTEIO;
 721                 }
 722         }
 723         if (retval)
 724                 dev_err(dp->dev, "eDP link training failed (%d)\n", retval);
 725
 726         return retval;
 727 }
 728
 729 static int exynos_dp_set_link_train(struct exynos_dp_device *dp,
 730                                 u32 count,
 731                                 u32 bwtype)
 732 {
 733         int i;
 734         int retval;
 735
 736         for (i = 0; i < DP_TIMEOUT_LOOP_COUNT; i++) {
 737                 exynos_dp_init_training(dp, count, bwtype);
 738                 retval = exynos_dp_sw_link_training(dp);
 739                 if (retval == 0)
 740                         break;
 741
 742                 usleep_range(100, 110);
 743         }
 744
 745         return retval;
 746 }
 747
 748 static int exynos_dp_config_video(struct exynos_dp_device *dp)
 749 {
 750         int retval = 0;
 751         int timeout_loop = 0;
 752         int done_count = 0;
 753
 754         exynos_dp_config_video_slave_mode(dp);
 755
 756         exynos_dp_set_video_color_format(dp);
 757
 758         if (exynos_dp_get_pll_lock_status(dp) == PLL_UNLOCKED) {
 759                 dev_err(dp->dev, "PLL is not locked yet.\n");
 760                 return -EINVAL;
 761         }
 762
 763         for (;;) {
 764                 timeout_loop++;
 765                 if (exynos_dp_is_slave_video_stream_clock_on(dp) == 0)
 766                         break;
 767                 if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) {
 768                         dev_err(dp->dev, "Timeout of video streamclk ok\n");
 769                         return -ETIMEDOUT;
 770                 }
 771
 772                 usleep_range(1, 2);
 773         }
 774
 775         /* Set to use the register calculated M/N video */
 776         exynos_dp_set_video_cr_mn(dp, CALCULATED_M, 0, 0);
 777
 778         /* For video bist, Video timing must be generated by register */
 779         exynos_dp_set_video_timing_mode(dp, VIDEO_TIMING_FROM_CAPTURE);
 780
 781         /* Disable video mute */
 782         exynos_dp_enable_video_mute(dp, 0);
 783
 784         /* Configure video slave mode */
 785         exynos_dp_enable_video_master(dp, 0);
 786
 787         /* Enable video */
 788         exynos_dp_start_video(dp);
 789
 790         timeout_loop = 0;
 791
 792         for (;;) {
 793                 timeout_loop++;
 794                 if (exynos_dp_is_video_stream_on(dp) == 0) {
 795                         done_count++;
 796                         if (done_count > 10)
 797                                 break;
 798                 } else if (done_count) {
 799                         done_count = 0;
 800                 }
 801                 if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) {
 802                         dev_err(dp->dev, "Timeout of video streamclk ok\n");
 803                         return -ETIMEDOUT;
 804                 }
 805
 806                 usleep_range(1000, 1001);
 807         }
 808
 809         if (retval != 0)
 810                 dev_err(dp->dev, "Video stream is not detected!\n");
 811
 812         return retval;
 813 }
 814
 815 static void exynos_dp_enable_scramble(struct exynos_dp_device *dp, bool enable)
 816 {
 817         u8 data;
 818
 819         if (enable) {
 820                 exynos_dp_enable_scrambling(dp);
 821
 822                 exynos_dp_read_byte_from_dpcd(dp,
 823                         DP_TRAINING_PATTERN_SET,
 824                         &data);
 825                 exynos_dp_write_byte_to_dpcd(dp,
 826                         DP_TRAINING_PATTERN_SET,
 827                         (u8)(data & ~DP_LINK_SCRAMBLING_DISABLE));
 828         } else {
 829                 exynos_dp_disable_scrambling(dp);
 830
 831                 exynos_dp_read_byte_from_dpcd(dp,
 832                         DP_TRAINING_PATTERN_SET,
 833                         &data);
 834                 exynos_dp_write_byte_to_dpcd(dp,
 835                         DP_TRAINING_PATTERN_SET,
 836                         (u8)(data | DP_LINK_SCRAMBLING_DISABLE));
 837         }
 838 }
 839
 840 static irqreturn_t exynos_dp_irq_handler(int irq, void *arg)
 841 {
 842         struct exynos_dp_device *dp = arg;
 843
 844         enum dp_irq_type irq_type;
 845
 846         irq_type = exynos_dp_get_irq_type(dp);
 847         switch (irq_type) {
 848         case DP_IRQ_TYPE_HP_CABLE_IN:
 849                 dev_dbg(dp->dev, "Received irq - cable in\n");
 850                 schedule_work(&dp->hotplug_work);
 851                 exynos_dp_clear_hotplug_interrupts(dp);
 852                 break;
 853         case DP_IRQ_TYPE_HP_CABLE_OUT:
 854                 dev_dbg(dp->dev, "Received irq - cable out\n");
 855                 exynos_dp_clear_hotplug_interrupts(dp);
 856                 break;
 857         case DP_IRQ_TYPE_HP_CHANGE:
 858                 /*
 859                  * We get these change notifications once in a while, but there
 860                  * is nothing we can do with them. Just ignore it for now and
 861                  * only handle cable changes.
 862                  */
 863                 dev_dbg(dp->dev, "Received irq - hotplug change; ignoring.\n");
 864                 exynos_dp_clear_hotplug_interrupts(dp);
 865                 break;
 866         default:
 867                 dev_err(dp->dev, "Received irq - unknown type!\n");
 868                 break;
 869         }
 870         return IRQ_HANDLED;
 871 }
 872
 873 static void exynos_dp_hotplug(struct work_struct *work)
 874 {
 875         struct exynos_dp_device *dp;
 876
 877         dp = container_of(work, struct exynos_dp_device, hotplug_work);
 878
 879         if (dp->drm_dev)
 880                 drm_helper_hpd_irq_event(dp->drm_dev);
 881 }
 882
 883 static void exynos_dp_commit(struct exynos_drm_display *display)
 884 {
 885         struct exynos_dp_device *dp = display->ctx;
 886         int ret;
 887
 888         /* Keep the panel disabled while we configure video */
 889         if (dp->panel) {
 890                 if (drm_panel_disable(dp->panel))
 891                         DRM_ERROR("failed to disable the panel\n");
 892         }
 893
 894         ret = exynos_dp_detect_hpd(dp);
 895         if (ret) {
 896                 /* Cable has been disconnected, we're done */
 897                 return;
 898         }
 899
 900         ret = exynos_dp_handle_edid(dp);
 901         if (ret) {
 902                 dev_err(dp->dev, "unable to handle edid\n");
 903                 return;
 904         }
 905
 906         ret = exynos_dp_set_link_train(dp, dp->video_info->lane_count,
 907                                         dp->video_info->link_rate);
 908         if (ret) {
 909                 dev_err(dp->dev, "unable to do link train\n");
 910                 return;
 911         }
 912
 913         exynos_dp_enable_scramble(dp, 1);
 914         exynos_dp_enable_rx_to_enhanced_mode(dp, 1);
 915         exynos_dp_enable_enhanced_mode(dp, 1);
 916
 917         exynos_dp_set_lane_count(dp, dp->video_info->lane_count);
 918         exynos_dp_set_link_bandwidth(dp, dp->video_info->link_rate);
 919
 920         exynos_dp_init_video(dp);
 921         ret = exynos_dp_config_video(dp);
 922         if (ret)
 923                 dev_err(dp->dev, "unable to config video\n");
 924
 925         /* Safe to enable the panel now */
 926         if (dp->panel) {
 927                 if (drm_panel_enable(dp->panel))
 928                         DRM_ERROR("failed to enable the panel\n");
 929         }
 930 }
 931
 932 static enum drm_connector_status exynos_dp_detect(
 933                                 struct drm_connector *connector, bool force)
 934 {
 935         return connector_status_connected;
 936 }
 937
 938 static void exynos_dp_connector_destroy(struct drm_connector *connector)
 939 {
 940         drm_connector_unregister(connector);
 941         drm_connector_cleanup(connector);
 942 }
 943
 944 static struct drm_connector_funcs exynos_dp_connector_funcs = {
 945         .dpms = drm_helper_connector_dpms,
 946         .fill_modes = drm_helper_probe_single_connector_modes,
 947         .detect = exynos_dp_detect,
 948         .destroy = exynos_dp_connector_destroy,
 949 };
 950
 951 static int exynos_dp_get_modes(struct drm_connector *connector)
 952 {
 953         struct exynos_dp_device *dp = ctx_from_connector(connector);
 954         struct drm_display_mode *mode;
 955
 956         if (dp->panel)
 957                 return drm_panel_get_modes(dp->panel);
 958
 959         mode = drm_mode_create(connector->dev);
 960         if (!mode) {
 961                 DRM_ERROR("failed to create a new display mode.\n");
 962                 return 0;
 963         }
 964
 965         drm_display_mode_from_videomode(&dp->priv.vm, mode);
 966         mode->width_mm = dp->priv.width_mm;
 967         mode->height_mm = dp->priv.height_mm;
 968         connector->display_info.width_mm = mode->width_mm;
 969         connector->display_info.height_mm = mode->height_mm;
 970
 971         mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 972         drm_mode_set_name(mode);
 973         drm_mode_probed_add(connector, mode);
 974
 975         return 1;
 976 }
 977
 978 static struct drm_encoder *exynos_dp_best_encoder(
 979                         struct drm_connector *connector)
 980 {
 981         struct exynos_dp_device *dp = ctx_from_connector(connector);
 982
 983         return dp->encoder;
 984 }
 985
 986 static struct drm_connector_helper_funcs exynos_dp_connector_helper_funcs = {
 987         .get_modes = exynos_dp_get_modes,
 988         .best_encoder = exynos_dp_best_encoder,
 989 };
 990
 991 static bool find_bridge(const char *compat, struct bridge_init *bridge)
 992 {
 993         bridge->client = NULL;
 994         bridge->node = of_find_compatible_node(NULL, NULL, compat);
 995         if (!bridge->node)
 996                 return false;
 997
 998         bridge->client = of_find_i2c_device_by_node(bridge->node);
 999         if (!bridge->client)
1000                 return false;
1001
1002         return true;
1003 }
1004
1005 /* returns the number of bridges attached */
1006 static int exynos_drm_attach_lcd_bridge(struct drm_device *dev,
1007                 struct drm_encoder *encoder)
1008 {
1009         struct bridge_init bridge;
1010         int ret;
1011
1012         if (find_bridge("nxp,ptn3460", &bridge)) {
1013                 ret = ptn3460_init(dev, encoder, bridge.client, bridge.node);
1014                 if (!ret)
1015                         return 1;
1016         }
1017         return 0;
1018 }
1019
1020 static int exynos_dp_create_connector(struct exynos_drm_display *display,
1021                                 struct drm_encoder *encoder)
1022 {
1023         struct exynos_dp_device *dp = display->ctx;
1024         struct drm_connector *connector = &dp->connector;
1025         int ret;
1026
1027         dp->encoder = encoder;
1028
1029         /* Pre-empt DP connector creation if there's a bridge */
1030         ret = exynos_drm_attach_lcd_bridge(dp->drm_dev, encoder);
1031         if (ret)
1032                 return 0;
1033
1034         connector->polled = DRM_CONNECTOR_POLL_HPD;
1035
1036         ret = drm_connector_init(dp->drm_dev, connector,
1037                         &exynos_dp_connector_funcs, DRM_MODE_CONNECTOR_eDP);
1038         if (ret) {
1039                 DRM_ERROR("Failed to initialize connector with drm\n");
1040                 return ret;
1041         }
1042
1043         drm_connector_helper_add(connector, &exynos_dp_connector_helper_funcs);
1044         drm_connector_register(connector);
1045         drm_mode_connector_attach_encoder(connector, encoder);
1046
1047         if (dp->panel)
1048                 ret = drm_panel_attach(dp->panel, &dp->connector);
1049
1050         return ret;
1051 }
1052
1053 static void exynos_dp_phy_init(struct exynos_dp_device *dp)
1054 {
1055         if (dp->phy) {
1056                 phy_power_on(dp->phy);
1057         } else if (dp->phy_addr) {
1058                 u32 reg;
1059
1060                 reg = __raw_readl(dp->phy_addr);
1061                 reg |= dp->enable_mask;
1062                 __raw_writel(reg, dp->phy_addr);
1063         }
1064 }
1065
1066 static void exynos_dp_phy_exit(struct exynos_dp_device *dp)
1067 {
1068         if (dp->phy) {
1069                 phy_power_off(dp->phy);
1070         } else if (dp->phy_addr) {
1071                 u32 reg;
1072
1073                 reg = __raw_readl(dp->phy_addr);
1074                 reg &= ~(dp->enable_mask);
1075                 __raw_writel(reg, dp->phy_addr);
1076         }
1077 }
1078
1079 static void exynos_dp_poweron(struct exynos_drm_display *display)
1080 {
1081         struct exynos_dp_device *dp = display->ctx;
1082
1083         if (dp->dpms_mode == DRM_MODE_DPMS_ON)
1084                 return;
1085
1086         if (dp->panel) {
1087                 if (drm_panel_prepare(dp->panel)) {
1088                         DRM_ERROR("failed to setup the panel\n");
1089                         return;
1090                 }
1091         }
1092
1093         clk_prepare_enable(dp->clock);
1094         exynos_dp_phy_init(dp);
1095         exynos_dp_init_dp(dp);
1096         enable_irq(dp->irq);
1097         exynos_dp_commit(display);
1098 }
1099
1100 static void exynos_dp_poweroff(struct exynos_drm_display *display)
1101 {
1102         struct exynos_dp_device *dp = display->ctx;
1103
1104         if (dp->dpms_mode != DRM_MODE_DPMS_ON)
1105                 return;
1106
1107         if (dp->panel) {
1108                 if (drm_panel_disable(dp->panel)) {
1109                         DRM_ERROR("failed to disable the panel\n");
1110                         return;
1111                 }
1112         }
1113
1114         disable_irq(dp->irq);
1115         flush_work(&dp->hotplug_work);
1116         exynos_dp_phy_exit(dp);
1117         clk_disable_unprepare(dp->clock);
1118
1119         if (dp->panel) {
1120                 if (drm_panel_unprepare(dp->panel))
1121                         DRM_ERROR("failed to turnoff the panel\n");
1122         }
1123 }
1124
1125 static void exynos_dp_dpms(struct exynos_drm_display *display, int mode)
1126 {
1127         struct exynos_dp_device *dp = display->ctx;
1128
1129         switch (mode) {
1130         case DRM_MODE_DPMS_ON:
1131                 exynos_dp_poweron(display);
1132                 break;
1133         case DRM_MODE_DPMS_STANDBY:
1134         case DRM_MODE_DPMS_SUSPEND:
1135         case DRM_MODE_DPMS_OFF:
1136                 exynos_dp_poweroff(display);
1137                 break;
1138         default:
1139                 break;
1140         }
1141         dp->dpms_mode = mode;
1142 }
1143
1144 static struct exynos_drm_display_ops exynos_dp_display_ops = {
1145         .create_connector = exynos_dp_create_connector,
1146         .dpms = exynos_dp_dpms,
1147         .commit = exynos_dp_commit,
1148 };
1149
1150 static struct exynos_drm_display exynos_dp_display = {
1151         .type = EXYNOS_DISPLAY_TYPE_LCD,
1152         .ops = &exynos_dp_display_ops,
1153 };
1154
1155 static struct video_info *exynos_dp_dt_parse_pdata(struct device *dev)
1156 {
1157         struct device_node *dp_node = dev->of_node;
1158         struct video_info *dp_video_config;
1159
1160         dp_video_config = devm_kzalloc(dev,
1161                                 sizeof(*dp_video_config), GFP_KERNEL);
1162         if (!dp_video_config)
1163                 return ERR_PTR(-ENOMEM);
1164
1165         dp_video_config->h_sync_polarity =
1166                 of_property_read_bool(dp_node, "hsync-active-high");
1167
1168         dp_video_config->v_sync_polarity =
1169                 of_property_read_bool(dp_node, "vsync-active-high");
1170
1171         dp_video_config->interlaced =
1172                 of_property_read_bool(dp_node, "interlaced");
1173
1174         if (of_property_read_u32(dp_node, "samsung,color-space",
1175                                 &dp_video_config->color_space)) {
1176                 dev_err(dev, "failed to get color-space\n");
1177                 return ERR_PTR(-EINVAL);
1178         }
1179
1180         if (of_property_read_u32(dp_node, "samsung,dynamic-range",
1181                                 &dp_video_config->dynamic_range)) {
1182                 dev_err(dev, "failed to get dynamic-range\n");
1183                 return ERR_PTR(-EINVAL);
1184         }
1185
1186         if (of_property_read_u32(dp_node, "samsung,ycbcr-coeff",
1187                                 &dp_video_config->ycbcr_coeff)) {
1188                 dev_err(dev, "failed to get ycbcr-coeff\n");
1189                 return ERR_PTR(-EINVAL);
1190         }
1191
1192         if (of_property_read_u32(dp_node, "samsung,color-depth",
1193                                 &dp_video_config->color_depth)) {
1194                 dev_err(dev, "failed to get color-depth\n");
1195                 return ERR_PTR(-EINVAL);
1196         }
1197
1198         if (of_property_read_u32(dp_node, "samsung,link-rate",
1199                                 &dp_video_config->link_rate)) {
1200                 dev_err(dev, "failed to get link-rate\n");
1201                 return ERR_PTR(-EINVAL);
1202         }
1203
1204         if (of_property_read_u32(dp_node, "samsung,lane-count",
1205                                 &dp_video_config->lane_count)) {
1206                 dev_err(dev, "failed to get lane-count\n");
1207                 return ERR_PTR(-EINVAL);
1208         }
1209
1210         return dp_video_config;
1211 }
1212
1213 static int exynos_dp_dt_parse_phydata(struct exynos_dp_device *dp)
1214 {
1215         struct device_node *dp_phy_node = of_node_get(dp->dev->of_node);
1216         u32 phy_base;
1217         int ret = 0;
1218
1219         dp_phy_node = of_find_node_by_name(dp_phy_node, "dptx-phy");
1220         if (!dp_phy_node) {
1221                 dp->phy = devm_phy_get(dp->dev, "dp");
1222                 return PTR_ERR_OR_ZERO(dp->phy);
1223         }
1224
1225         if (of_property_read_u32(dp_phy_node, "reg", &phy_base)) {
1226                 dev_err(dp->dev, "failed to get reg for dptx-phy\n");
1227                 ret = -EINVAL;
1228                 goto err;
1229         }
1230
1231         if (of_property_read_u32(dp_phy_node, "samsung,enable-mask",
1232                                 &dp->enable_mask)) {
1233                 dev_err(dp->dev, "failed to get enable-mask for dptx-phy\n");
1234                 ret = -EINVAL;
1235                 goto err;
1236         }
1237
1238         dp->phy_addr = ioremap(phy_base, SZ_4);
1239         if (!dp->phy_addr) {
1240                 dev_err(dp->dev, "failed to ioremap dp-phy\n");
1241                 ret = -ENOMEM;
1242                 goto err;
1243         }
1244
1245 err:
1246         of_node_put(dp_phy_node);
1247
1248         return ret;
1249 }
1250
1251 static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp)
1252 {
1253         int ret;
1254
1255         ret = of_get_videomode(dp->dev->of_node, &dp->priv.vm,
1256                         OF_USE_NATIVE_MODE);
1257         if (ret) {
1258                 DRM_ERROR("failed: of_get_videomode() : %d\n", ret);
1259                 return ret;
1260         }
1261         return 0;
1262 }
1263
1264 static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
1265 {
1266         struct platform_device *pdev = to_platform_device(dev);
1267         struct drm_device *drm_dev = data;
1268         struct resource *res;
1269         struct exynos_dp_device *dp = exynos_dp_display.ctx;
1270         unsigned int irq_flags;
1271         int ret = 0;
1272
1273         dp->dev = &pdev->dev;
1274         dp->dpms_mode = DRM_MODE_DPMS_OFF;
1275
1276         dp->video_info = exynos_dp_dt_parse_pdata(&pdev->dev);
1277         if (IS_ERR(dp->video_info))
1278                 return PTR_ERR(dp->video_info);
1279
1280         ret = exynos_dp_dt_parse_phydata(dp);
1281         if (ret)
1282                 return ret;
1283
1284         if (!dp->panel) {
1285                 ret = exynos_dp_dt_parse_panel(dp);
1286                 if (ret)
1287                         return ret;
1288         }
1289
1290         dp->clock = devm_clk_get(&pdev->dev, "dp");
1291         if (IS_ERR(dp->clock)) {
1292                 dev_err(&pdev->dev, "failed to get clock\n");
1293                 return PTR_ERR(dp->clock);
1294         }
1295
1296         clk_prepare_enable(dp->clock);
1297
1298         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1299
1300         dp->reg_base = devm_ioremap_resource(&pdev->dev, res);
1301         if (IS_ERR(dp->reg_base))
1302                 return PTR_ERR(dp->reg_base);
1303
1304         dp->hpd_gpio = of_get_named_gpio(dev->of_node, "samsung,hpd-gpio", 0);
1305
1306         if (gpio_is_valid(dp->hpd_gpio)) {
1307                 /*
1308                  * Set up the hotplug GPIO from the device tree as an interrupt.
1309                  * Simply specifying a different interrupt in the device tree
1310                  * doesn't work since we handle hotplug rather differently when
1311                  * using a GPIO.  We also need the actual GPIO specifier so
1312                  * that we can get the current state of the GPIO.
1313                  */
1314                 ret = devm_gpio_request_one(&pdev->dev, dp->hpd_gpio, GPIOF_IN,
1315                                             "hpd_gpio");
1316                 if (ret) {
1317                         dev_err(&pdev->dev, "failed to get hpd gpio\n");
1318                         return ret;
1319                 }
1320                 dp->irq = gpio_to_irq(dp->hpd_gpio);
1321                 irq_flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
1322         } else {
1323                 dp->hpd_gpio = -ENODEV;
1324                 dp->irq = platform_get_irq(pdev, 0);
1325                 irq_flags = 0;
1326         }
1327
1328         if (dp->irq == -ENXIO) {
1329                 dev_err(&pdev->dev, "failed to get irq\n");
1330                 return -ENODEV;
1331         }
1332
1333         INIT_WORK(&dp->hotplug_work, exynos_dp_hotplug);
1334
1335         exynos_dp_phy_init(dp);
1336
1337         exynos_dp_init_dp(dp);
1338
1339         ret = devm_request_irq(&pdev->dev, dp->irq, exynos_dp_irq_handler,
1340                         irq_flags, "exynos-dp", dp);
1341         if (ret) {
1342                 dev_err(&pdev->dev, "failed to request irq\n");
1343                 return ret;
1344         }
1345         disable_irq(dp->irq);
1346
1347         dp->drm_dev = drm_dev;
1348
1349         platform_set_drvdata(pdev, &exynos_dp_display);
1350
1351         return exynos_drm_create_enc_conn(drm_dev, &exynos_dp_display);
1352 }
1353
1354 static void exynos_dp_unbind(struct device *dev, struct device *master,
1355                                 void *data)
1356 {
1357         struct exynos_drm_display *display = dev_get_drvdata(dev);
1358
1359         exynos_dp_dpms(display, DRM_MODE_DPMS_OFF);
1360 }
1361
1362 static const struct component_ops exynos_dp_ops = {
1363         .bind   = exynos_dp_bind,
1364         .unbind = exynos_dp_unbind,
1365 };
1366
1367 static int exynos_dp_probe(struct platform_device *pdev)
1368 {
1369         struct device *dev = &pdev->dev;
1370         struct device_node *panel_node;
1371         struct exynos_dp_device *dp;
1372         int ret;
1373
1374         ret = exynos_drm_component_add(&pdev->dev, EXYNOS_DEVICE_TYPE_CONNECTOR,
1375                                         exynos_dp_display.type);
1376         if (ret)
1377                 return ret;
1378
1379         dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device),
1380                                 GFP_KERNEL);
1381         if (!dp)
1382                 return -ENOMEM;
1383
1384         panel_node = of_parse_phandle(dev->of_node, "panel", 0);
1385         if (panel_node) {
1386                 dp->panel = of_drm_find_panel(panel_node);
1387                 of_node_put(panel_node);
1388                 if (!dp->panel)
1389                         return -EPROBE_DEFER;
1390         }
1391
1392         exynos_dp_display.ctx = dp;
1393
1394         ret = component_add(&pdev->dev, &exynos_dp_ops);
1395         if (ret)
1396                 exynos_drm_component_del(&pdev->dev,
1397                                                 EXYNOS_DEVICE_TYPE_CONNECTOR);
1398
1399         return ret;
1400 }
1401
1402 static int exynos_dp_remove(struct platform_device *pdev)
1403 {
1404         component_del(&pdev->dev, &exynos_dp_ops);
1405         exynos_drm_component_del(&pdev->dev, EXYNOS_DEVICE_TYPE_CONNECTOR);
1406
1407         return 0;
1408 }
1409
1410 #ifdef CONFIG_PM_SLEEP
1411 static int exynos_dp_suspend(struct device *dev)
1412 {
1413         struct platform_device *pdev = to_platform_device(dev);
1414         struct exynos_drm_display *display = platform_get_drvdata(pdev);
1415
1416         exynos_dp_dpms(display, DRM_MODE_DPMS_OFF);
1417         return 0;
1418 }
1419
1420 static int exynos_dp_resume(struct device *dev)
1421 {
1422         struct platform_device *pdev = to_platform_device(dev);
1423         struct exynos_drm_display *display = platform_get_drvdata(pdev);
1424
1425         exynos_dp_dpms(display, DRM_MODE_DPMS_ON);
1426         return 0;
1427 }
1428 #endif
1429
1430 static const struct dev_pm_ops exynos_dp_pm_ops = {
1431         SET_SYSTEM_SLEEP_PM_OPS(exynos_dp_suspend, exynos_dp_resume)
1432 };
1433
1434 static const struct of_device_id exynos_dp_match[] = {
1435         { .compatible = "samsung,exynos5-dp" },
1436         {},
1437 };
1438 MODULE_DEVICE_TABLE(of, exynos_dp_match);
1439
1440 struct platform_driver dp_driver = {
1441         .probe          = exynos_dp_probe,
1442         .remove         = exynos_dp_remove,
1443         .driver         = {
1444                 .name   = "exynos-dp",
1445                 .owner  = THIS_MODULE,
1446                 .pm     = &exynos_dp_pm_ops,
1447                 .of_match_table = exynos_dp_match,
1448         },
1449 };
1450
1451 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
1452 MODULE_DESCRIPTION("Samsung SoC DP Driver");
1453 MODULE_LICENSE("GPL v2");