drivers/video/exynos/exynos_dp.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2012 Samsung Electronics
   4  *
   5  * Author: Donghwa Lee <dh09.lee@samsung.com>
   6  */
   7
   8 #include <common.h>
   9 #include <dm.h>
  10 #include <common.h>
  11 #include <display.h>
  12 #include <fdtdec.h>
  13 #include <log.h>
  14 #include <linux/libfdt.h>
  15 #include <malloc.h>
  16 #include <video_bridge.h>
  17 #include <linux/compat.h>
  18 #include <linux/err.h>
  19 #include <asm/arch/clk.h>
  20 #include <asm/arch/cpu.h>
  21 #include <asm/arch/dp_info.h>
  22 #include <asm/arch/dp.h>
  23 #include <asm/arch/pinmux.h>
  24 #include <asm/arch/power.h>
  25
  26 #include "exynos_dp_lowlevel.h"
  27
  28 DECLARE_GLOBAL_DATA_PTR;
  29
  30 static void exynos_dp_disp_info(struct edp_disp_info *disp_info)
  31 {
  32         disp_info->h_total = disp_info->h_res + disp_info->h_sync_width +
  33                 disp_info->h_back_porch + disp_info->h_front_porch;
  34         disp_info->v_total = disp_info->v_res + disp_info->v_sync_width +
  35                 disp_info->v_back_porch + disp_info->v_front_porch;
  36
  37         return;
  38 }
  39
  40 static int exynos_dp_init_dp(struct exynos_dp *regs)
  41 {
  42         int ret;
  43         exynos_dp_reset(regs);
  44
  45         /* SW defined function Normal operation */
  46         exynos_dp_enable_sw_func(regs, DP_ENABLE);
  47
  48         ret = exynos_dp_init_analog_func(regs);
  49         if (ret != EXYNOS_DP_SUCCESS)
  50                 return ret;
  51
  52         exynos_dp_init_hpd(regs);
  53         exynos_dp_init_aux(regs);
  54
  55         return ret;
  56 }
  57
  58 static unsigned char exynos_dp_calc_edid_check_sum(unsigned char *edid_data)
  59 {
  60         int i;
  61         unsigned char sum = 0;
  62
  63         for (i = 0; i < EDID_BLOCK_LENGTH; i++)
  64                 sum = sum + edid_data[i];
  65
  66         return sum;
  67 }
  68
  69 static unsigned int exynos_dp_read_edid(struct exynos_dp *regs)
  70 {
  71         unsigned char edid[EDID_BLOCK_LENGTH * 2];
  72         unsigned int extend_block = 0;
  73         unsigned char sum;
  74         unsigned char test_vector;
  75         int retval;
  76
  77         /*
  78          * EDID device address is 0x50.
  79          * However, if necessary, you must have set upper address
  80          * into E-EDID in I2C device, 0x30.
  81          */
  82
  83         /* Read Extension Flag, Number of 128-byte EDID extension blocks */
  84         exynos_dp_read_byte_from_i2c(regs, I2C_EDID_DEVICE_ADDR,
  85                                      EDID_EXTENSION_FLAG, &extend_block);
  86
  87         if (extend_block > 0) {
  88                 printf("DP EDID data includes a single extension!\n");
  89
  90                 /* Read EDID data */
  91                 retval = exynos_dp_read_bytes_from_i2c(regs,
  92                                                 I2C_EDID_DEVICE_ADDR,
  93                                                 EDID_HEADER_PATTERN,
  94                                                 EDID_BLOCK_LENGTH,
  95                                                 &edid[EDID_HEADER_PATTERN]);
  96                 if (retval != 0) {
  97                         printf("DP EDID Read failed!\n");
  98                         return -1;
  99                 }
 100                 sum = exynos_dp_calc_edid_check_sum(edid);
 101                 if (sum != 0) {
 102                         printf("DP EDID bad checksum!\n");
 103                         return -1;
 104                 }
 105
 106                 /* Read additional EDID data */
 107                 retval = exynos_dp_read_bytes_from_i2c(regs,
 108                                 I2C_EDID_DEVICE_ADDR,
 109                                 EDID_BLOCK_LENGTH,
 110                                 EDID_BLOCK_LENGTH,
 111                                 &edid[EDID_BLOCK_LENGTH]);
 112                 if (retval != 0) {
 113                         printf("DP EDID Read failed!\n");
 114                         return -1;
 115                 }
 116                 sum = exynos_dp_calc_edid_check_sum(&edid[EDID_BLOCK_LENGTH]);
 117                 if (sum != 0) {
 118                         printf("DP EDID bad checksum!\n");
 119                         return -1;
 120                 }
 121
 122                 exynos_dp_read_byte_from_dpcd(regs, DPCD_TEST_REQUEST,
 123                                               &test_vector);
 124                 if (test_vector & DPCD_TEST_EDID_READ) {
 125                         exynos_dp_write_byte_to_dpcd(regs,
 126                                 DPCD_TEST_EDID_CHECKSUM,
 127                                 edid[EDID_BLOCK_LENGTH + EDID_CHECKSUM]);
 128                         exynos_dp_write_byte_to_dpcd(regs,
 129                                 DPCD_TEST_RESPONSE,
 130                                 DPCD_TEST_EDID_CHECKSUM_WRITE);
 131                 }
 132         } else {
 133                 debug("DP EDID data does not include any extensions.\n");
 134
 135                 /* Read EDID data */
 136                 retval = exynos_dp_read_bytes_from_i2c(regs,
 137                                 I2C_EDID_DEVICE_ADDR,
 138                                 EDID_HEADER_PATTERN,
 139                                 EDID_BLOCK_LENGTH,
 140                                 &edid[EDID_HEADER_PATTERN]);
 141
 142                 if (retval != 0) {
 143                         printf("DP EDID Read failed!\n");
 144                         return -1;
 145                 }
 146                 sum = exynos_dp_calc_edid_check_sum(edid);
 147                 if (sum != 0) {
 148                         printf("DP EDID bad checksum!\n");
 149                         return -1;
 150                 }
 151
 152                 exynos_dp_read_byte_from_dpcd(regs, DPCD_TEST_REQUEST,
 153                         &test_vector);
 154                 if (test_vector & DPCD_TEST_EDID_READ) {
 155                         exynos_dp_write_byte_to_dpcd(regs,
 156                                 DPCD_TEST_EDID_CHECKSUM, edid[EDID_CHECKSUM]);
 157                         exynos_dp_write_byte_to_dpcd(regs,
 158                                 DPCD_TEST_RESPONSE,
 159                                 DPCD_TEST_EDID_CHECKSUM_WRITE);
 160                 }
 161         }
 162
 163         debug("DP EDID Read success!\n");
 164
 165         return 0;
 166 }
 167
 168 static unsigned int exynos_dp_handle_edid(struct exynos_dp *regs,
 169                                           struct exynos_dp_priv *priv)
 170 {
 171         unsigned char buf[12];
 172         unsigned int ret;
 173         unsigned char temp;
 174         unsigned char retry_cnt;
 175         unsigned char dpcd_rev[16];
 176         unsigned char lane_bw[16];
 177         unsigned char lane_cnt[16];
 178
 179         memset(dpcd_rev, 0, 16);
 180         memset(lane_bw, 0, 16);
 181         memset(lane_cnt, 0, 16);
 182         memset(buf, 0, 12);
 183
 184         retry_cnt = 5;
 185         while (retry_cnt) {
 186                 /* Read DPCD 0x0000-0x000b */
 187                 ret = exynos_dp_read_bytes_from_dpcd(regs, DPCD_DPCD_REV, 12,
 188                                                      buf);
 189                 if (ret != EXYNOS_DP_SUCCESS) {
 190                         if (retry_cnt == 0) {
 191                                 printf("DP read_byte_from_dpcd() failed\n");
 192                                 return ret;
 193                         }
 194                         retry_cnt--;
 195                 } else
 196                         break;
 197         }
 198
 199         /* */
 200         temp = buf[DPCD_DPCD_REV];
 201         if (temp == DP_DPCD_REV_10 || temp == DP_DPCD_REV_11)
 202                 priv->dpcd_rev = temp;
 203         else {
 204                 printf("DP Wrong DPCD Rev : %x\n", temp);
 205                 return -ENODEV;
 206         }
 207
 208         temp = buf[DPCD_MAX_LINK_RATE];
 209         if (temp == DP_LANE_BW_1_62 || temp == DP_LANE_BW_2_70)
 210                 priv->lane_bw = temp;
 211         else {
 212                 printf("DP Wrong MAX LINK RATE : %x\n", temp);
 213                 return -EINVAL;
 214         }
 215
 216         /* Refer VESA Display Port Standard Ver1.1a Page 120 */
 217         if (priv->dpcd_rev == DP_DPCD_REV_11) {
 218                 temp = buf[DPCD_MAX_LANE_COUNT] & 0x1f;
 219                 if (buf[DPCD_MAX_LANE_COUNT] & 0x80)
 220                         priv->dpcd_efc = 1;
 221                 else
 222                         priv->dpcd_efc = 0;
 223         } else {
 224                 temp = buf[DPCD_MAX_LANE_COUNT];
 225                 priv->dpcd_efc = 0;
 226         }
 227
 228         if (temp == DP_LANE_CNT_1 || temp == DP_LANE_CNT_2 ||
 229                         temp == DP_LANE_CNT_4) {
 230                 priv->lane_cnt = temp;
 231         } else {
 232                 printf("DP Wrong MAX LANE COUNT : %x\n", temp);
 233                 return -EINVAL;
 234         }
 235
 236         ret = exynos_dp_read_edid(regs);
 237         if (ret != EXYNOS_DP_SUCCESS) {
 238                 printf("DP exynos_dp_read_edid() failed\n");
 239                 return -EINVAL;
 240         }
 241
 242         return ret;
 243 }
 244
 245 static void exynos_dp_init_training(struct exynos_dp *regs)
 246 {
 247         /*
 248          * MACRO_RST must be applied after the PLL_LOCK to avoid
 249          * the DP inter pair skew issue for at least 10 us
 250          */
 251         exynos_dp_reset_macro(regs);
 252
 253         /* All DP analog module power up */
 254         exynos_dp_set_analog_power_down(regs, POWER_ALL, 0);
 255 }
 256
 257 static unsigned int exynos_dp_link_start(struct exynos_dp *regs,
 258                                          struct exynos_dp_priv *priv)
 259 {
 260         unsigned char buf[5];
 261         unsigned int ret = 0;
 262
 263         debug("DP: %s was called\n", __func__);
 264
 265         priv->lt_info.lt_status = DP_LT_CR;
 266         priv->lt_info.ep_loop = 0;
 267         priv->lt_info.cr_loop[0] = 0;
 268         priv->lt_info.cr_loop[1] = 0;
 269         priv->lt_info.cr_loop[2] = 0;
 270         priv->lt_info.cr_loop[3] = 0;
 271
 272                 /* Set sink to D0 (Sink Not Ready) mode. */
 273         ret = exynos_dp_write_byte_to_dpcd(regs, DPCD_SINK_POWER_STATE,
 274                                            DPCD_SET_POWER_STATE_D0);
 275         if (ret != EXYNOS_DP_SUCCESS) {
 276                 printf("DP write_dpcd_byte failed\n");
 277                 return ret;
 278         }
 279
 280         /* Set link rate and count as you want to establish */
 281         exynos_dp_set_link_bandwidth(regs, priv->lane_bw);
 282         exynos_dp_set_lane_count(regs, priv->lane_cnt);
 283
 284         /* Setup RX configuration */
 285         buf[0] = priv->lane_bw;
 286         buf[1] = priv->lane_cnt;
 287
 288         ret = exynos_dp_write_bytes_to_dpcd(regs, DPCD_LINK_BW_SET, 2, buf);
 289         if (ret != EXYNOS_DP_SUCCESS) {
 290                 printf("DP write_dpcd_byte failed\n");
 291                 return ret;
 292         }
 293
 294         exynos_dp_set_lane_pre_emphasis(regs, PRE_EMPHASIS_LEVEL_0,
 295                         priv->lane_cnt);
 296
 297         /* Set training pattern 1 */
 298         exynos_dp_set_training_pattern(regs, TRAINING_PTN1);
 299
 300         /* Set RX training pattern */
 301         buf[0] = DPCD_SCRAMBLING_DISABLED | DPCD_TRAINING_PATTERN_1;
 302
 303         buf[1] = DPCD_PRE_EMPHASIS_SET_PATTERN_2_LEVEL_0 |
 304                 DPCD_VOLTAGE_SWING_SET_PATTERN_1_LEVEL_0;
 305         buf[2] = DPCD_PRE_EMPHASIS_SET_PATTERN_2_LEVEL_0 |
 306                 DPCD_VOLTAGE_SWING_SET_PATTERN_1_LEVEL_0;
 307         buf[3] = DPCD_PRE_EMPHASIS_SET_PATTERN_2_LEVEL_0 |
 308                 DPCD_VOLTAGE_SWING_SET_PATTERN_1_LEVEL_0;
 309         buf[4] = DPCD_PRE_EMPHASIS_SET_PATTERN_2_LEVEL_0 |
 310                 DPCD_VOLTAGE_SWING_SET_PATTERN_1_LEVEL_0;
 311
 312         ret = exynos_dp_write_bytes_to_dpcd(regs, DPCD_TRAINING_PATTERN_SET,
 313                                             5, buf);
 314         if (ret != EXYNOS_DP_SUCCESS) {
 315                 printf("DP write_dpcd_byte failed\n");
 316                 return ret;
 317         }
 318
 319         return ret;
 320 }
 321
 322 static unsigned int exynos_dp_training_pattern_dis(struct exynos_dp *regs)
 323 {
 324         unsigned int ret;
 325
 326         exynos_dp_set_training_pattern(regs, DP_NONE);
 327
 328         ret = exynos_dp_write_byte_to_dpcd(regs, DPCD_TRAINING_PATTERN_SET,
 329                                            DPCD_TRAINING_PATTERN_DISABLED);
 330         if (ret != EXYNOS_DP_SUCCESS) {
 331                 printf("DP request_link_training_req failed\n");
 332                 return -EAGAIN;
 333         }
 334
 335         return ret;
 336 }
 337
 338 static unsigned int exynos_dp_enable_rx_to_enhanced_mode(
 339                 struct exynos_dp *regs, unsigned char enable)
 340 {
 341         unsigned char data;
 342         unsigned int ret;
 343
 344         ret = exynos_dp_read_byte_from_dpcd(regs, DPCD_LANE_COUNT_SET,
 345                                             &data);
 346         if (ret != EXYNOS_DP_SUCCESS) {
 347                 printf("DP read_from_dpcd failed\n");
 348                 return -EAGAIN;
 349         }
 350
 351         if (enable)
 352                 data = DPCD_ENHANCED_FRAME_EN | DPCD_LN_COUNT_SET(data);
 353         else
 354                 data = DPCD_LN_COUNT_SET(data);
 355
 356         ret = exynos_dp_write_byte_to_dpcd(regs, DPCD_LANE_COUNT_SET, data);
 357         if (ret != EXYNOS_DP_SUCCESS) {
 358                         printf("DP write_to_dpcd failed\n");
 359                         return -EAGAIN;
 360
 361         }
 362
 363         return ret;
 364 }
 365
 366 static unsigned int exynos_dp_set_enhanced_mode(struct exynos_dp *regs,
 367                                                 unsigned char enhance_mode)
 368 {
 369         unsigned int ret;
 370
 371         ret = exynos_dp_enable_rx_to_enhanced_mode(regs, enhance_mode);
 372         if (ret != EXYNOS_DP_SUCCESS) {
 373                 printf("DP rx_enhance_mode failed\n");
 374                 return -EAGAIN;
 375         }
 376
 377         exynos_dp_enable_enhanced_mode(regs, enhance_mode);
 378
 379         return ret;
 380 }
 381
 382 static int exynos_dp_read_dpcd_lane_stat(struct exynos_dp *regs,
 383                                          struct exynos_dp_priv *priv,
 384                                          unsigned char *status)
 385 {
 386         unsigned int ret, i;
 387         unsigned char buf[2];
 388         unsigned char lane_stat[DP_LANE_CNT_4] = {0,};
 389         unsigned char shift_val[DP_LANE_CNT_4] = {0,};
 390
 391         shift_val[0] = 0;
 392         shift_val[1] = 4;
 393         shift_val[2] = 0;
 394         shift_val[3] = 4;
 395
 396         ret = exynos_dp_read_bytes_from_dpcd(regs, DPCD_LANE0_1_STATUS, 2,
 397                                              buf);
 398         if (ret != EXYNOS_DP_SUCCESS) {
 399                 printf("DP read lane status failed\n");
 400                 return ret;
 401         }
 402
 403         for (i = 0; i < priv->lane_cnt; i++) {
 404                 lane_stat[i] = (buf[(i / 2)] >> shift_val[i]) & 0x0f;
 405                 if (lane_stat[0] != lane_stat[i]) {
 406                         printf("Wrong lane status\n");
 407                         return -EINVAL;
 408                 }
 409         }
 410
 411         *status = lane_stat[0];
 412
 413         return ret;
 414 }
 415
 416 static unsigned int exynos_dp_read_dpcd_adj_req(struct exynos_dp *regs,
 417                 unsigned char lane_num, unsigned char *sw, unsigned char *em)
 418 {
 419         unsigned int ret;
 420         unsigned char buf;
 421         unsigned int dpcd_addr;
 422         unsigned char shift_val[DP_LANE_CNT_4] = {0, 4, 0, 4};
 423
 424         /* lane_num value is used as array index, so this range 0 ~ 3 */
 425         dpcd_addr = DPCD_ADJUST_REQUEST_LANE0_1 + (lane_num / 2);
 426
 427         ret = exynos_dp_read_byte_from_dpcd(regs, dpcd_addr, &buf);
 428         if (ret != EXYNOS_DP_SUCCESS) {
 429                 printf("DP read adjust request failed\n");
 430                 return -EAGAIN;
 431         }
 432
 433         *sw = ((buf >> shift_val[lane_num]) & 0x03);
 434         *em = ((buf >> shift_val[lane_num]) & 0x0c) >> 2;
 435
 436         return ret;
 437 }
 438
 439 static int exynos_dp_equalizer_err_link(struct exynos_dp *regs,
 440                                         struct exynos_dp_priv *priv)
 441 {
 442         int ret;
 443
 444         ret = exynos_dp_training_pattern_dis(regs);
 445         if (ret != EXYNOS_DP_SUCCESS) {
 446                 printf("DP training_pattern_disable() failed\n");
 447                 priv->lt_info.lt_status = DP_LT_FAIL;
 448         }
 449
 450         ret = exynos_dp_set_enhanced_mode(regs, priv->dpcd_efc);
 451         if (ret != EXYNOS_DP_SUCCESS) {
 452                 printf("DP set_enhanced_mode() failed\n");
 453                 priv->lt_info.lt_status = DP_LT_FAIL;
 454         }
 455
 456         return ret;
 457 }
 458
 459 static int exynos_dp_reduce_link_rate(struct exynos_dp *regs,
 460                                       struct exynos_dp_priv *priv)
 461 {
 462         int ret;
 463
 464         if (priv->lane_bw == DP_LANE_BW_2_70) {
 465                 priv->lane_bw = DP_LANE_BW_1_62;
 466                 printf("DP Change lane bw to 1.62Gbps\n");
 467                 priv->lt_info.lt_status = DP_LT_START;
 468                 ret = EXYNOS_DP_SUCCESS;
 469         } else {
 470                 ret = exynos_dp_training_pattern_dis(regs);
 471                 if (ret != EXYNOS_DP_SUCCESS)
 472                         printf("DP training_patter_disable() failed\n");
 473
 474                 ret = exynos_dp_set_enhanced_mode(regs, priv->dpcd_efc);
 475                 if (ret != EXYNOS_DP_SUCCESS)
 476                         printf("DP set_enhanced_mode() failed\n");
 477
 478                 priv->lt_info.lt_status = DP_LT_FAIL;
 479         }
 480
 481         return ret;
 482 }
 483
 484 static unsigned int exynos_dp_process_clock_recovery(struct exynos_dp *regs,
 485                                         struct exynos_dp_priv *priv)
 486 {
 487         unsigned int ret;
 488         unsigned char lane_stat;
 489         unsigned char lt_ctl_val[DP_LANE_CNT_4] = {0, };
 490         unsigned int i;
 491         unsigned char adj_req_sw;
 492         unsigned char adj_req_em;
 493         unsigned char buf[5];
 494
 495         debug("DP: %s was called\n", __func__);
 496         mdelay(1);
 497
 498         ret = exynos_dp_read_dpcd_lane_stat(regs, priv, &lane_stat);
 499         if (ret != EXYNOS_DP_SUCCESS) {
 500                         printf("DP read lane status failed\n");
 501                         priv->lt_info.lt_status = DP_LT_FAIL;
 502                         return ret;
 503         }
 504
 505         if (lane_stat & DP_LANE_STAT_CR_DONE) {
 506                 debug("DP clock Recovery training succeed\n");
 507                 exynos_dp_set_training_pattern(regs, TRAINING_PTN2);
 508
 509                 for (i = 0; i < priv->lane_cnt; i++) {
 510                         ret = exynos_dp_read_dpcd_adj_req(regs, i,
 511                                                 &adj_req_sw, &adj_req_em);
 512                         if (ret != EXYNOS_DP_SUCCESS) {
 513                                 priv->lt_info.lt_status = DP_LT_FAIL;
 514                                 return ret;
 515                         }
 516
 517                         lt_ctl_val[i] = 0;
 518                         lt_ctl_val[i] = adj_req_em << 3 | adj_req_sw;
 519
 520                         if ((adj_req_sw == VOLTAGE_LEVEL_3)
 521                                 || (adj_req_em == PRE_EMPHASIS_LEVEL_3)) {
 522                                 lt_ctl_val[i] |= MAX_DRIVE_CURRENT_REACH_3 |
 523                                         MAX_PRE_EMPHASIS_REACH_3;
 524                         }
 525                         exynos_dp_set_lanex_pre_emphasis(regs,
 526                                                          lt_ctl_val[i], i);
 527                 }
 528
 529                 buf[0] =  DPCD_SCRAMBLING_DISABLED | DPCD_TRAINING_PATTERN_2;
 530                 buf[1] = lt_ctl_val[0];
 531                 buf[2] = lt_ctl_val[1];
 532                 buf[3] = lt_ctl_val[2];
 533                 buf[4] = lt_ctl_val[3];
 534
 535                 ret = exynos_dp_write_bytes_to_dpcd(regs,
 536                                 DPCD_TRAINING_PATTERN_SET, 5, buf);
 537                 if (ret != EXYNOS_DP_SUCCESS) {
 538                         printf("DP write training pattern1 failed\n");
 539                         priv->lt_info.lt_status = DP_LT_FAIL;
 540                         return ret;
 541                 } else
 542                         priv->lt_info.lt_status = DP_LT_ET;
 543         } else {
 544                 for (i = 0; i < priv->lane_cnt; i++) {
 545                         lt_ctl_val[i] = exynos_dp_get_lanex_pre_emphasis(
 546                                                 regs, i);
 547                                 ret = exynos_dp_read_dpcd_adj_req(regs, i,
 548                                                 &adj_req_sw, &adj_req_em);
 549                         if (ret != EXYNOS_DP_SUCCESS) {
 550                                 printf("DP read adj req failed\n");
 551                                 priv->lt_info.lt_status = DP_LT_FAIL;
 552                                 return ret;
 553                         }
 554
 555                         if ((adj_req_sw == VOLTAGE_LEVEL_3) ||
 556                                         (adj_req_em == PRE_EMPHASIS_LEVEL_3))
 557                                 ret = exynos_dp_reduce_link_rate(regs,
 558                                                                  priv);
 559
 560                         if ((DRIVE_CURRENT_SET_0_GET(lt_ctl_val[i]) ==
 561                                                 adj_req_sw) &&
 562                                 (PRE_EMPHASIS_SET_0_GET(lt_ctl_val[i]) ==
 563                                                 adj_req_em)) {
 564                                 priv->lt_info.cr_loop[i]++;
 565                                 if (priv->lt_info.cr_loop[i] == MAX_CR_LOOP)
 566                                         ret = exynos_dp_reduce_link_rate(
 567                                                         regs, priv);
 568                         }
 569
 570                         lt_ctl_val[i] = 0;
 571                         lt_ctl_val[i] = adj_req_em << 3 | adj_req_sw;
 572
 573                         if ((adj_req_sw == VOLTAGE_LEVEL_3) ||
 574                                         (adj_req_em == PRE_EMPHASIS_LEVEL_3)) {
 575                                 lt_ctl_val[i] |= MAX_DRIVE_CURRENT_REACH_3 |
 576                                         MAX_PRE_EMPHASIS_REACH_3;
 577                         }
 578                         exynos_dp_set_lanex_pre_emphasis(regs,
 579                                                          lt_ctl_val[i], i);
 580                 }
 581
 582                 ret = exynos_dp_write_bytes_to_dpcd(regs,
 583                                 DPCD_TRAINING_LANE0_SET, 4, lt_ctl_val);
 584                 if (ret != EXYNOS_DP_SUCCESS) {
 585                         printf("DP write training pattern2 failed\n");
 586                         priv->lt_info.lt_status = DP_LT_FAIL;
 587                         return ret;
 588                 }
 589         }
 590
 591         return ret;
 592 }
 593
 594 static unsigned int exynos_dp_process_equalizer_training(
 595                 struct exynos_dp *regs, struct exynos_dp_priv *priv)
 596 {
 597         unsigned int ret;
 598         unsigned char lane_stat, adj_req_sw, adj_req_em, i;
 599         unsigned char lt_ctl_val[DP_LANE_CNT_4] = {0,};
 600         unsigned char interlane_aligned = 0;
 601         unsigned char f_bw;
 602         unsigned char f_lane_cnt;
 603         unsigned char sink_stat;
 604
 605         mdelay(1);
 606
 607         ret = exynos_dp_read_dpcd_lane_stat(regs, priv, &lane_stat);
 608         if (ret != EXYNOS_DP_SUCCESS) {
 609                 printf("DP read lane status failed\n");
 610                 priv->lt_info.lt_status = DP_LT_FAIL;
 611                 return ret;
 612         }
 613
 614         debug("DP lane stat : %x\n", lane_stat);
 615
 616         if (lane_stat & DP_LANE_STAT_CR_DONE) {
 617                 ret = exynos_dp_read_byte_from_dpcd(regs,
 618                                                     DPCD_LN_ALIGN_UPDATED,
 619                                                     &sink_stat);
 620                 if (ret != EXYNOS_DP_SUCCESS) {
 621                         priv->lt_info.lt_status = DP_LT_FAIL;
 622
 623                         return ret;
 624                 }
 625
 626                 interlane_aligned = (sink_stat & DPCD_INTERLANE_ALIGN_DONE);
 627
 628                 for (i = 0; i < priv->lane_cnt; i++) {
 629                         ret = exynos_dp_read_dpcd_adj_req(regs, i,
 630                                         &adj_req_sw, &adj_req_em);
 631                         if (ret != EXYNOS_DP_SUCCESS) {
 632                                 printf("DP read adj req 1 failed\n");
 633                                 priv->lt_info.lt_status = DP_LT_FAIL;
 634
 635                                 return ret;
 636                         }
 637
 638                         lt_ctl_val[i] = 0;
 639                         lt_ctl_val[i] = adj_req_em << 3 | adj_req_sw;
 640
 641                         if ((adj_req_sw == VOLTAGE_LEVEL_3) ||
 642                                 (adj_req_em == PRE_EMPHASIS_LEVEL_3)) {
 643                                 lt_ctl_val[i] |= MAX_DRIVE_CURRENT_REACH_3;
 644                                 lt_ctl_val[i] |= MAX_PRE_EMPHASIS_REACH_3;
 645                         }
 646                 }
 647
 648                 if (((lane_stat&DP_LANE_STAT_CE_DONE) &&
 649                         (lane_stat&DP_LANE_STAT_SYM_LOCK))
 650                         && (interlane_aligned == DPCD_INTERLANE_ALIGN_DONE)) {
 651                         debug("DP Equalizer training succeed\n");
 652
 653                         f_bw = exynos_dp_get_link_bandwidth(regs);
 654                         f_lane_cnt = exynos_dp_get_lane_count(regs);
 655
 656                         debug("DP final BandWidth : %x\n", f_bw);
 657                         debug("DP final Lane Count : %x\n", f_lane_cnt);
 658
 659                         priv->lt_info.lt_status = DP_LT_FINISHED;
 660
 661                         exynos_dp_equalizer_err_link(regs, priv);
 662
 663                 } else {
 664                         priv->lt_info.ep_loop++;
 665
 666                         if (priv->lt_info.ep_loop > MAX_EQ_LOOP) {
 667                                 if (priv->lane_bw == DP_LANE_BW_2_70) {
 668                                         ret = exynos_dp_reduce_link_rate(
 669                                                         regs, priv);
 670                                 } else {
 671                                         priv->lt_info.lt_status =
 672                                                                 DP_LT_FAIL;
 673                                         exynos_dp_equalizer_err_link(regs,
 674                                                                      priv);
 675                                 }
 676                         } else {
 677                                 for (i = 0; i < priv->lane_cnt; i++)
 678                                         exynos_dp_set_lanex_pre_emphasis(
 679                                                 regs, lt_ctl_val[i], i);
 680
 681                                 ret = exynos_dp_write_bytes_to_dpcd(regs,
 682                                                 DPCD_TRAINING_LANE0_SET,
 683                                                 4, lt_ctl_val);
 684                                 if (ret != EXYNOS_DP_SUCCESS) {
 685                                         printf("DP set lt pattern failed\n");
 686                                         priv->lt_info.lt_status =
 687                                                                 DP_LT_FAIL;
 688                                         exynos_dp_equalizer_err_link(regs,
 689                                                                      priv);
 690                                 }
 691                         }
 692                 }
 693         } else if (priv->lane_bw == DP_LANE_BW_2_70) {
 694                 ret = exynos_dp_reduce_link_rate(regs, priv);
 695         } else {
 696                 priv->lt_info.lt_status = DP_LT_FAIL;
 697                 exynos_dp_equalizer_err_link(regs, priv);
 698         }
 699
 700         return ret;
 701 }
 702
 703 static unsigned int exynos_dp_sw_link_training(struct exynos_dp *regs,
 704                                                struct exynos_dp_priv *priv)
 705 {
 706         unsigned int ret = 0;
 707         int training_finished;
 708
 709         /* Turn off unnecessary lane */
 710         if (priv->lane_cnt == 1)
 711                 exynos_dp_set_analog_power_down(regs, CH1_BLOCK, 1);
 712
 713         training_finished = 0;
 714
 715         priv->lt_info.lt_status = DP_LT_START;
 716
 717         /* Process here */
 718         while (!training_finished) {
 719                 switch (priv->lt_info.lt_status) {
 720                 case DP_LT_START:
 721                         ret = exynos_dp_link_start(regs, priv);
 722                         if (ret != EXYNOS_DP_SUCCESS) {
 723                                 printf("DP LT:link start failed\n");
 724                                 return ret;
 725                         }
 726                         break;
 727                 case DP_LT_CR:
 728                         ret = exynos_dp_process_clock_recovery(regs,
 729                                                                priv);
 730                         if (ret != EXYNOS_DP_SUCCESS) {
 731                                 printf("DP LT:clock recovery failed\n");
 732                                 return ret;
 733                         }
 734                         break;
 735                 case DP_LT_ET:
 736                         ret = exynos_dp_process_equalizer_training(regs,
 737                                                                    priv);
 738                         if (ret != EXYNOS_DP_SUCCESS) {
 739                                 printf("DP LT:equalizer training failed\n");
 740                                 return ret;
 741                         }
 742                         break;
 743                 case DP_LT_FINISHED:
 744                         training_finished = 1;
 745                         break;
 746                 case DP_LT_FAIL:
 747                         return -1;
 748                 }
 749         }
 750
 751         return ret;
 752 }
 753
 754 static unsigned int exynos_dp_set_link_train(struct exynos_dp *regs,
 755                                              struct exynos_dp_priv *priv)
 756 {
 757         unsigned int ret;
 758
 759         exynos_dp_init_training(regs);
 760
 761         ret = exynos_dp_sw_link_training(regs, priv);
 762         if (ret != EXYNOS_DP_SUCCESS)
 763                 printf("DP dp_sw_link_training() failed\n");
 764
 765         return ret;
 766 }
 767
 768 static void exynos_dp_enable_scramble(struct exynos_dp *regs,
 769                                       unsigned int enable)
 770 {
 771         unsigned char data;
 772
 773         if (enable) {
 774                 exynos_dp_enable_scrambling(regs, DP_ENABLE);
 775
 776                 exynos_dp_read_byte_from_dpcd(regs,
 777                                               DPCD_TRAINING_PATTERN_SET, &data);
 778                 exynos_dp_write_byte_to_dpcd(regs, DPCD_TRAINING_PATTERN_SET,
 779                         (u8)(data & ~DPCD_SCRAMBLING_DISABLED));
 780         } else {
 781                 exynos_dp_enable_scrambling(regs, DP_DISABLE);
 782                 exynos_dp_read_byte_from_dpcd(regs,
 783                                               DPCD_TRAINING_PATTERN_SET, &data);
 784                 exynos_dp_write_byte_to_dpcd(regs, DPCD_TRAINING_PATTERN_SET,
 785                         (u8)(data | DPCD_SCRAMBLING_DISABLED));
 786         }
 787 }
 788
 789 static unsigned int exynos_dp_config_video(struct exynos_dp *regs,
 790                                            struct exynos_dp_priv *priv)
 791 {
 792         unsigned int ret = 0;
 793         unsigned int retry_cnt;
 794
 795         mdelay(1);
 796
 797         if (priv->video_info.master_mode) {
 798                 printf("DP does not support master mode\n");
 799                 return -ENODEV;
 800         } else {
 801                 /* debug slave */
 802                 exynos_dp_config_video_slave_mode(regs,
 803                                                   &priv->video_info);
 804         }
 805
 806         exynos_dp_set_video_color_format(regs, &priv->video_info);
 807
 808         if (priv->video_info.bist_mode) {
 809                 if (exynos_dp_config_video_bist(regs, priv) != 0)
 810                         return -1;
 811         }
 812
 813         ret = exynos_dp_get_pll_lock_status(regs);
 814         if (ret != PLL_LOCKED) {
 815                 printf("DP PLL is not locked yet\n");
 816                 return -EIO;
 817         }
 818
 819         if (priv->video_info.master_mode == 0) {
 820                 retry_cnt = 10;
 821                 while (retry_cnt) {
 822                         ret = exynos_dp_is_slave_video_stream_clock_on(regs);
 823                         if (ret != EXYNOS_DP_SUCCESS) {
 824                                 if (retry_cnt == 0) {
 825                                         printf("DP stream_clock_on failed\n");
 826                                         return ret;
 827                                 }
 828                                 retry_cnt--;
 829                                 mdelay(1);
 830                         } else
 831                                 break;
 832                 }
 833         }
 834
 835         /* Set to use the register calculated M/N video */
 836         exynos_dp_set_video_cr_mn(regs, CALCULATED_M, 0, 0);
 837
 838         /* For video bist, Video timing must be generated by register */
 839         exynos_dp_set_video_timing_mode(regs, VIDEO_TIMING_FROM_CAPTURE);
 840
 841         /* Enable video bist */
 842         if (priv->video_info.bist_pattern != COLOR_RAMP &&
 843                 priv->video_info.bist_pattern != BALCK_WHITE_V_LINES &&
 844                 priv->video_info.bist_pattern != COLOR_SQUARE)
 845                 exynos_dp_enable_video_bist(regs,
 846                                             priv->video_info.bist_mode);
 847         else
 848                 exynos_dp_enable_video_bist(regs, DP_DISABLE);
 849
 850         /* Disable video mute */
 851         exynos_dp_enable_video_mute(regs, DP_DISABLE);
 852
 853         /* Configure video Master or Slave mode */
 854         exynos_dp_enable_video_master(regs,
 855                                       priv->video_info.master_mode);
 856
 857         /* Enable video */
 858         exynos_dp_start_video(regs);
 859
 860         if (priv->video_info.master_mode == 0) {
 861                 retry_cnt = 100;
 862                 while (retry_cnt) {
 863                         ret = exynos_dp_is_video_stream_on(regs);
 864                         if (ret != EXYNOS_DP_SUCCESS) {
 865                                 if (retry_cnt == 0) {
 866                                         printf("DP Timeout of video stream\n");
 867                                         return ret;
 868                                 }
 869                                 retry_cnt--;
 870                                 mdelay(5);
 871                         } else
 872                                 break;
 873                 }
 874         }
 875
 876         return ret;
 877 }
 878
 879 static int exynos_dp_ofdata_to_platdata(struct udevice *dev)
 880 {
 881         struct exynos_dp_priv *priv = dev_get_priv(dev);
 882         const void *blob = gd->fdt_blob;
 883         unsigned int node = dev_of_offset(dev);
 884         fdt_addr_t addr;
 885
 886         addr = devfdt_get_addr(dev);
 887         if (addr == FDT_ADDR_T_NONE) {
 888                 debug("Can't get the DP base address\n");
 889                 return -EINVAL;
 890         }
 891         priv->regs = (struct exynos_dp *)addr;
 892         priv->disp_info.h_res = fdtdec_get_int(blob, node,
 893                                                         "samsung,h-res", 0);
 894         priv->disp_info.h_sync_width = fdtdec_get_int(blob, node,
 895                                                 "samsung,h-sync-width", 0);
 896         priv->disp_info.h_back_porch = fdtdec_get_int(blob, node,
 897                                                 "samsung,h-back-porch", 0);
 898         priv->disp_info.h_front_porch = fdtdec_get_int(blob, node,
 899                                                 "samsung,h-front-porch", 0);
 900         priv->disp_info.v_res = fdtdec_get_int(blob, node,
 901                                                 "samsung,v-res", 0);
 902         priv->disp_info.v_sync_width = fdtdec_get_int(blob, node,
 903                                                 "samsung,v-sync-width", 0);
 904         priv->disp_info.v_back_porch = fdtdec_get_int(blob, node,
 905                                                 "samsung,v-back-porch", 0);
 906         priv->disp_info.v_front_porch = fdtdec_get_int(blob, node,
 907                                                 "samsung,v-front-porch", 0);
 908         priv->disp_info.v_sync_rate = fdtdec_get_int(blob, node,
 909                                                 "samsung,v-sync-rate", 0);
 910
 911         priv->lt_info.lt_status = fdtdec_get_int(blob, node,
 912                                                 "samsung,lt-status", 0);
 913
 914         priv->video_info.master_mode = fdtdec_get_int(blob, node,
 915                                                 "samsung,master-mode", 0);
 916         priv->video_info.bist_mode = fdtdec_get_int(blob, node,
 917                                                 "samsung,bist-mode", 0);
 918         priv->video_info.bist_pattern = fdtdec_get_int(blob, node,
 919                                                 "samsung,bist-pattern", 0);
 920         priv->video_info.h_sync_polarity = fdtdec_get_int(blob, node,
 921                                                 "samsung,h-sync-polarity", 0);
 922         priv->video_info.v_sync_polarity = fdtdec_get_int(blob, node,
 923                                                 "samsung,v-sync-polarity", 0);
 924         priv->video_info.interlaced = fdtdec_get_int(blob, node,
 925                                                 "samsung,interlaced", 0);
 926         priv->video_info.color_space = fdtdec_get_int(blob, node,
 927                                                 "samsung,color-space", 0);
 928         priv->video_info.dynamic_range = fdtdec_get_int(blob, node,
 929                                                 "samsung,dynamic-range", 0);
 930         priv->video_info.ycbcr_coeff = fdtdec_get_int(blob, node,
 931                                                 "samsung,ycbcr-coeff", 0);
 932         priv->video_info.color_depth = fdtdec_get_int(blob, node,
 933                                                 "samsung,color-depth", 0);
 934         return 0;
 935 }
 936
 937 static int exynos_dp_bridge_init(struct udevice *dev)
 938 {
 939         const int max_tries = 10;
 940         int num_tries;
 941         int ret;
 942
 943         debug("%s\n", __func__);
 944         ret = video_bridge_attach(dev);
 945         if (ret) {
 946                 debug("video bridge init failed: %d\n", ret);
 947                 return ret;
 948         }
 949
 950         /*
 951          * We need to wait for 90ms after bringing up the bridge since there
 952          * is a phantom "high" on the HPD chip during its bootup.  The phantom
 953          * high comes within 7ms of de-asserting PD and persists for at least
 954          * 15ms.  The real high comes roughly 50ms after PD is de-asserted. The
 955          * phantom high makes it hard for us to know when the NXP chip is up.
 956          */
 957         mdelay(90);
 958
 959         for (num_tries = 0; num_tries < max_tries; num_tries++) {
 960                 /* Check HPD. If it's high, or we don't have it, all is well */
 961                 ret = video_bridge_check_attached(dev);
 962                 if (!ret || ret == -ENOENT)
 963                         return 0;
 964
 965                 debug("%s: eDP bridge failed to come up; try %d of %d\n",
 966                       __func__, num_tries, max_tries);
 967         }
 968
 969         /* Immediately go into bridge reset if the hp line is not high */
 970         return -EIO;
 971 }
 972
 973 static int exynos_dp_bridge_setup(const void *blob)
 974 {
 975         const int max_tries = 2;
 976         int num_tries;
 977         struct udevice *dev;
 978         int ret;
 979
 980         /* Configure I2C registers for Parade bridge */
 981         ret = uclass_get_device(UCLASS_VIDEO_BRIDGE, 0, &dev);
 982         if (ret) {
 983                 debug("video bridge init failed: %d\n", ret);
 984                 return ret;
 985         }
 986
 987         if (strncmp(dev->driver->name, "parade", 6)) {
 988                 /* Mux HPHPD to the special hotplug detect mode */
 989                 exynos_pinmux_config(PERIPH_ID_DPHPD, 0);
 990         }
 991
 992         for (num_tries = 0; num_tries < max_tries; num_tries++) {
 993                 ret = exynos_dp_bridge_init(dev);
 994                 if (!ret)
 995                         return 0;
 996                 if (num_tries == max_tries - 1)
 997                         break;
 998
 999                 /*
1000                 * If we're here, the bridge chip failed to initialise.
1001                 * Power down the bridge in an attempt to reset.
1002                 */
1003                 video_bridge_set_active(dev, false);
1004
1005                 /*
1006                 * Arbitrarily wait 300ms here with DP_N low.  Don't know for
1007                 * sure how long we should wait, but we're being paranoid.
1008                 */
1009                 mdelay(300);
1010         }
1011
1012         return ret;
1013 }
1014 int exynos_dp_enable(struct udevice *dev, int panel_bpp,
1015                      const struct display_timing *timing)
1016 {
1017         struct exynos_dp_priv *priv = dev_get_priv(dev);
1018         struct exynos_dp *regs = priv->regs;
1019         unsigned int ret;
1020
1021         debug("%s: start\n", __func__);
1022         exynos_dp_disp_info(&priv->disp_info);
1023
1024         ret = exynos_dp_bridge_setup(gd->fdt_blob);
1025         if (ret && ret != -ENODEV)
1026                 printf("LCD bridge failed to enable: %d\n", ret);
1027
1028         exynos_dp_phy_ctrl(1);
1029
1030         ret = exynos_dp_init_dp(regs);
1031         if (ret != EXYNOS_DP_SUCCESS) {
1032                 printf("DP exynos_dp_init_dp() failed\n");
1033                 return ret;
1034         }
1035
1036         ret = exynos_dp_handle_edid(regs, priv);
1037         if (ret != EXYNOS_DP_SUCCESS) {
1038                 printf("EDP handle_edid fail\n");
1039                 return ret;
1040         }
1041
1042         ret = exynos_dp_set_link_train(regs, priv);
1043         if (ret != EXYNOS_DP_SUCCESS) {
1044                 printf("DP link training fail\n");
1045                 return ret;
1046         }
1047
1048         exynos_dp_enable_scramble(regs, DP_ENABLE);
1049         exynos_dp_enable_rx_to_enhanced_mode(regs, DP_ENABLE);
1050         exynos_dp_enable_enhanced_mode(regs, DP_ENABLE);
1051
1052         exynos_dp_set_link_bandwidth(regs, priv->lane_bw);
1053         exynos_dp_set_lane_count(regs, priv->lane_cnt);
1054
1055         exynos_dp_init_video(regs);
1056         ret = exynos_dp_config_video(regs, priv);
1057         if (ret != EXYNOS_DP_SUCCESS) {
1058                 printf("Exynos DP init failed\n");
1059                 return ret;
1060         }
1061
1062         debug("Exynos DP init done\n");
1063
1064         return ret;
1065 }
1066
1067
1068 static const struct dm_display_ops exynos_dp_ops = {
1069         .enable = exynos_dp_enable,
1070 };
1071
1072 static const struct udevice_id exynos_dp_ids[] = {
1073         { .compatible = "samsung,exynos5-dp" },
1074         { }
1075 };
1076
1077 U_BOOT_DRIVER(exynos_dp) = {
1078         .name   = "exynos_dp",
1079         .id     = UCLASS_DISPLAY,
1080         .of_match = exynos_dp_ids,
1081         .ops    = &exynos_dp_ops,
1082         .ofdata_to_platdata     = exynos_dp_ofdata_to_platdata,
1083         .priv_auto_alloc_size   = sizeof(struct exynos_dp_priv),
1084 };