drivers/video/exynos_dp.c

   1 /*
   2  * Copyright (C) 2012 Samsung Electronics
   3  *
   4  * Author: Donghwa Lee <[email protected]>
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <config.h>
  10 #include <common.h>
  11 #include <malloc.h>
  12 #include <linux/err.h>
  13 #include <asm/arch/clk.h>
  14 #include <asm/arch/cpu.h>
  15 #include <asm/arch/dp_info.h>
  16 #include <asm/arch/dp.h>
  17 #include <fdtdec.h>
  18 #include <libfdt.h>
  19
  20 #include "exynos_dp_lowlevel.h"
  21
  22 DECLARE_GLOBAL_DATA_PTR;
  23
  24 static struct exynos_dp_platform_data *dp_pd;
  25
  26 void __exynos_set_dp_phy(unsigned int onoff)
  27 {
  28 }
  29 void exynos_set_dp_phy(unsigned int onoff)
  30         __attribute__((weak, alias("__exynos_set_dp_phy")));
  31
  32 static void exynos_dp_disp_info(struct edp_disp_info *disp_info)
  33 {
  34         disp_info->h_total = disp_info->h_res + disp_info->h_sync_width +
  35                 disp_info->h_back_porch + disp_info->h_front_porch;
  36         disp_info->v_total = disp_info->v_res + disp_info->v_sync_width +
  37                 disp_info->v_back_porch + disp_info->v_front_porch;
  38
  39         return;
  40 }
  41
  42 static int exynos_dp_init_dp(void)
  43 {
  44         int ret;
  45         exynos_dp_reset();
  46
  47         /* SW defined function Normal operation */
  48         exynos_dp_enable_sw_func(DP_ENABLE);
  49
  50         ret = exynos_dp_init_analog_func();
  51         if (ret != EXYNOS_DP_SUCCESS)
  52                 return ret;
  53
  54         exynos_dp_init_hpd();
  55         exynos_dp_init_aux();
  56
  57         return ret;
  58 }
  59
  60 static unsigned char exynos_dp_calc_edid_check_sum(unsigned char *edid_data)
  61 {
  62         int i;
  63         unsigned char sum = 0;
  64
  65         for (i = 0; i < EDID_BLOCK_LENGTH; i++)
  66                 sum = sum + edid_data[i];
  67
  68         return sum;
  69 }
  70
  71 static unsigned int exynos_dp_read_edid(void)
  72 {
  73         unsigned char edid[EDID_BLOCK_LENGTH * 2];
  74         unsigned int extend_block = 0;
  75         unsigned char sum;
  76         unsigned char test_vector;
  77         int retval;
  78
  79         /*
  80          * EDID device address is 0x50.
  81          * However, if necessary, you must have set upper address
  82          * into E-EDID in I2C device, 0x30.
  83          */
  84
  85         /* Read Extension Flag, Number of 128-byte EDID extension blocks */
  86         exynos_dp_read_byte_from_i2c(I2C_EDID_DEVICE_ADDR, EDID_EXTENSION_FLAG,
  87                         &extend_block);
  88
  89         if (extend_block > 0) {
  90                 printf("DP EDID data includes a single extension!\n");
  91
  92                 /* Read EDID data */
  93                 retval = exynos_dp_read_bytes_from_i2c(I2C_EDID_DEVICE_ADDR,
  94                                                 EDID_HEADER_PATTERN,
  95                                                 EDID_BLOCK_LENGTH,
  96                                                 &edid[EDID_HEADER_PATTERN]);
  97                 if (retval != 0) {
  98                         printf("DP EDID Read failed!\n");
  99                         return -1;
 100                 }
 101                 sum = exynos_dp_calc_edid_check_sum(edid);
 102                 if (sum != 0) {
 103                         printf("DP EDID bad checksum!\n");
 104                         return -1;
 105                 }
 106
 107                 /* Read additional EDID data */
 108                 retval = exynos_dp_read_bytes_from_i2c(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(DPCD_TEST_REQUEST,
 123                                         &test_vector);
 124                 if (test_vector & DPCD_TEST_EDID_READ) {
 125                         exynos_dp_write_byte_to_dpcd(DPCD_TEST_EDID_CHECKSUM,
 126                                 edid[EDID_BLOCK_LENGTH + EDID_CHECKSUM]);
 127                         exynos_dp_write_byte_to_dpcd(DPCD_TEST_RESPONSE,
 128                                 DPCD_TEST_EDID_CHECKSUM_WRITE);
 129                 }
 130         } else {
 131                 debug("DP EDID data does not include any extensions.\n");
 132
 133                 /* Read EDID data */
 134                 retval = exynos_dp_read_bytes_from_i2c(I2C_EDID_DEVICE_ADDR,
 135                                 EDID_HEADER_PATTERN,
 136                                 EDID_BLOCK_LENGTH,
 137                                 &edid[EDID_HEADER_PATTERN]);
 138
 139                 if (retval != 0) {
 140                         printf("DP EDID Read failed!\n");
 141                         return -1;
 142                 }
 143                 sum = exynos_dp_calc_edid_check_sum(edid);
 144                 if (sum != 0) {
 145                         printf("DP EDID bad checksum!\n");
 146                         return -1;
 147                 }
 148
 149                 exynos_dp_read_byte_from_dpcd(DPCD_TEST_REQUEST,
 150                         &test_vector);
 151                 if (test_vector & DPCD_TEST_EDID_READ) {
 152                         exynos_dp_write_byte_to_dpcd(DPCD_TEST_EDID_CHECKSUM,
 153                                 edid[EDID_CHECKSUM]);
 154                         exynos_dp_write_byte_to_dpcd(DPCD_TEST_RESPONSE,
 155                                 DPCD_TEST_EDID_CHECKSUM_WRITE);
 156                 }
 157         }
 158
 159         debug("DP EDID Read success!\n");
 160
 161         return 0;
 162 }
 163
 164 static unsigned int exynos_dp_handle_edid(struct edp_device_info *edp_info)
 165 {
 166         unsigned char buf[12];
 167         unsigned int ret;
 168         unsigned char temp;
 169         unsigned char retry_cnt;
 170         unsigned char dpcd_rev[16];
 171         unsigned char lane_bw[16];
 172         unsigned char lane_cnt[16];
 173
 174         memset(dpcd_rev, 0, 16);
 175         memset(lane_bw, 0, 16);
 176         memset(lane_cnt, 0, 16);
 177         memset(buf, 0, 12);
 178
 179         retry_cnt = 5;
 180         while (retry_cnt) {
 181                 /* Read DPCD 0x0000-0x000b */
 182                 ret = exynos_dp_read_bytes_from_dpcd(DPCD_DPCD_REV, 12,
 183                                 buf);
 184                 if (ret != EXYNOS_DP_SUCCESS) {
 185                         if (retry_cnt == 0) {
 186                                 printf("DP read_byte_from_dpcd() failed\n");
 187                                 return ret;
 188                         }
 189                         retry_cnt--;
 190                 } else
 191                         break;
 192         }
 193
 194         /* */
 195         temp = buf[DPCD_DPCD_REV];
 196         if (temp == DP_DPCD_REV_10 || temp == DP_DPCD_REV_11)
 197                 edp_info->dpcd_rev = temp;
 198         else {
 199                 printf("DP Wrong DPCD Rev : %x\n", temp);
 200                 return -ENODEV;
 201         }
 202
 203         temp = buf[DPCD_MAX_LINK_RATE];
 204         if (temp == DP_LANE_BW_1_62 || temp == DP_LANE_BW_2_70)
 205                 edp_info->lane_bw = temp;
 206         else {
 207                 printf("DP Wrong MAX LINK RATE : %x\n", temp);
 208                 return -EINVAL;
 209         }
 210
 211         /*Refer VESA Display Port Stnadard Ver1.1a Page 120 */
 212         if (edp_info->dpcd_rev == DP_DPCD_REV_11) {
 213                 temp = buf[DPCD_MAX_LANE_COUNT] & 0x1f;
 214                 if (buf[DPCD_MAX_LANE_COUNT] & 0x80)
 215                         edp_info->dpcd_efc = 1;
 216                 else
 217                         edp_info->dpcd_efc = 0;
 218         } else {
 219                 temp = buf[DPCD_MAX_LANE_COUNT];
 220                 edp_info->dpcd_efc = 0;
 221         }
 222
 223         if (temp == DP_LANE_CNT_1 || temp == DP_LANE_CNT_2 ||
 224                         temp == DP_LANE_CNT_4) {
 225                 edp_info->lane_cnt = temp;
 226         } else {
 227                 printf("DP Wrong MAX LANE COUNT : %x\n", temp);
 228                 return -EINVAL;
 229         }
 230
 231         ret = exynos_dp_read_edid();
 232         if (ret != EXYNOS_DP_SUCCESS) {
 233                 printf("DP exynos_dp_read_edid() failed\n");
 234                 return -EINVAL;
 235         }
 236
 237         return ret;
 238 }
 239
 240 static void exynos_dp_init_training(void)
 241 {
 242         /*
 243          * MACRO_RST must be applied after the PLL_LOCK to avoid
 244          * the DP inter pair skew issue for at least 10 us
 245          */
 246         exynos_dp_reset_macro();
 247
 248         /* All DP analog module power up */
 249         exynos_dp_set_analog_power_down(POWER_ALL, 0);
 250 }
 251
 252 static unsigned int exynos_dp_link_start(struct edp_device_info *edp_info)
 253 {
 254         unsigned char buf[5];
 255         unsigned int ret = 0;
 256
 257         debug("DP: %s was called\n", __func__);
 258
 259         edp_info->lt_info.lt_status = DP_LT_CR;
 260         edp_info->lt_info.ep_loop = 0;
 261         edp_info->lt_info.cr_loop[0] = 0;
 262         edp_info->lt_info.cr_loop[1] = 0;
 263         edp_info->lt_info.cr_loop[2] = 0;
 264         edp_info->lt_info.cr_loop[3] = 0;
 265
 266                 /* Set sink to D0 (Sink Not Ready) mode. */
 267                 ret = exynos_dp_write_byte_to_dpcd(DPCD_SINK_POWER_STATE,
 268                                 DPCD_SET_POWER_STATE_D0);
 269         if (ret != EXYNOS_DP_SUCCESS) {
 270                 printf("DP write_dpcd_byte failed\n");
 271                 return ret;
 272         }
 273
 274         /* Set link rate and count as you want to establish*/
 275         exynos_dp_set_link_bandwidth(edp_info->lane_bw);
 276         exynos_dp_set_lane_count(edp_info->lane_cnt);
 277
 278         /* Setup RX configuration */
 279         buf[0] = edp_info->lane_bw;
 280         buf[1] = edp_info->lane_cnt;
 281
 282         ret = exynos_dp_write_bytes_to_dpcd(DPCD_LINK_BW_SET, 2,
 283                         buf);
 284         if (ret != EXYNOS_DP_SUCCESS) {
 285                 printf("DP write_dpcd_byte failed\n");
 286                 return ret;
 287         }
 288
 289         exynos_dp_set_lane_pre_emphasis(PRE_EMPHASIS_LEVEL_0,
 290                         edp_info->lane_cnt);
 291
 292         /* Set training pattern 1 */
 293         exynos_dp_set_training_pattern(TRAINING_PTN1);
 294
 295         /* Set RX training pattern */
 296         buf[0] = DPCD_SCRAMBLING_DISABLED | DPCD_TRAINING_PATTERN_1;
 297
 298         buf[1] = DPCD_PRE_EMPHASIS_SET_PATTERN_2_LEVEL_0 |
 299                 DPCD_VOLTAGE_SWING_SET_PATTERN_1_LEVEL_0;
 300         buf[2] = DPCD_PRE_EMPHASIS_SET_PATTERN_2_LEVEL_0 |
 301                 DPCD_VOLTAGE_SWING_SET_PATTERN_1_LEVEL_0;
 302         buf[3] = DPCD_PRE_EMPHASIS_SET_PATTERN_2_LEVEL_0 |
 303                 DPCD_VOLTAGE_SWING_SET_PATTERN_1_LEVEL_0;
 304         buf[4] = DPCD_PRE_EMPHASIS_SET_PATTERN_2_LEVEL_0 |
 305                 DPCD_VOLTAGE_SWING_SET_PATTERN_1_LEVEL_0;
 306
 307         ret = exynos_dp_write_bytes_to_dpcd(DPCD_TRAINING_PATTERN_SET,
 308                         5, buf);
 309         if (ret != EXYNOS_DP_SUCCESS) {
 310                 printf("DP write_dpcd_byte failed\n");
 311                 return ret;
 312         }
 313
 314         return ret;
 315 }
 316
 317 static unsigned int exynos_dp_training_pattern_dis(void)
 318 {
 319         unsigned int ret = EXYNOS_DP_SUCCESS;
 320
 321         exynos_dp_set_training_pattern(DP_NONE);
 322
 323         ret = exynos_dp_write_byte_to_dpcd(DPCD_TRAINING_PATTERN_SET,
 324                         DPCD_TRAINING_PATTERN_DISABLED);
 325         if (ret != EXYNOS_DP_SUCCESS) {
 326                 printf("DP requst_link_traninig_req failed\n");
 327                 return -EAGAIN;
 328         }
 329
 330         return ret;
 331 }
 332
 333 static unsigned int exynos_dp_enable_rx_to_enhanced_mode(unsigned char enable)
 334 {
 335         unsigned char data;
 336         unsigned int ret = EXYNOS_DP_SUCCESS;
 337
 338         ret = exynos_dp_read_byte_from_dpcd(DPCD_LANE_COUNT_SET,
 339                         &data);
 340         if (ret != EXYNOS_DP_SUCCESS) {
 341                 printf("DP read_from_dpcd failed\n");
 342                 return -EAGAIN;
 343         }
 344
 345         if (enable)
 346                 data = DPCD_ENHANCED_FRAME_EN | DPCD_LN_COUNT_SET(data);
 347         else
 348                 data = DPCD_LN_COUNT_SET(data);
 349
 350         ret = exynos_dp_write_byte_to_dpcd(DPCD_LANE_COUNT_SET,
 351                         data);
 352         if (ret != EXYNOS_DP_SUCCESS) {
 353                         printf("DP write_to_dpcd failed\n");
 354                         return -EAGAIN;
 355
 356         }
 357
 358         return ret;
 359 }
 360
 361 static unsigned int exynos_dp_set_enhanced_mode(unsigned char enhance_mode)
 362 {
 363         unsigned int ret = EXYNOS_DP_SUCCESS;
 364
 365         ret = exynos_dp_enable_rx_to_enhanced_mode(enhance_mode);
 366         if (ret != EXYNOS_DP_SUCCESS) {
 367                 printf("DP rx_enhance_mode failed\n");
 368                 return -EAGAIN;
 369         }
 370
 371         exynos_dp_enable_enhanced_mode(enhance_mode);
 372
 373         return ret;
 374 }
 375
 376 static int exynos_dp_read_dpcd_lane_stat(struct edp_device_info *edp_info,
 377                 unsigned char *status)
 378 {
 379         unsigned int ret, i;
 380         unsigned char buf[2];
 381         unsigned char lane_stat[DP_LANE_CNT_4] = {0,};
 382         unsigned char shift_val[DP_LANE_CNT_4] = {0,};
 383
 384         shift_val[0] = 0;
 385         shift_val[1] = 4;
 386         shift_val[2] = 0;
 387         shift_val[3] = 4;
 388
 389         ret = exynos_dp_read_bytes_from_dpcd(DPCD_LANE0_1_STATUS, 2, buf);
 390         if (ret != EXYNOS_DP_SUCCESS) {
 391                 printf("DP read lane status failed\n");
 392                 return ret;
 393         }
 394
 395         for (i = 0; i < edp_info->lane_cnt; i++) {
 396                 lane_stat[i] = (buf[(i / 2)] >> shift_val[i]) & 0x0f;
 397                 if (lane_stat[0] != lane_stat[i]) {
 398                         printf("Wrong lane status\n");
 399                         return -EINVAL;
 400                 }
 401         }
 402
 403         *status = lane_stat[0];
 404
 405         return ret;
 406 }
 407
 408 static unsigned int exynos_dp_read_dpcd_adj_req(unsigned char lane_num,
 409                 unsigned char *sw, unsigned char *em)
 410 {
 411         unsigned int ret = EXYNOS_DP_SUCCESS;
 412         unsigned char buf;
 413         unsigned int dpcd_addr;
 414         unsigned char shift_val[DP_LANE_CNT_4] = {0, 4, 0, 4};
 415
 416         /*lane_num value is used as arry index, so this range 0 ~ 3 */
 417         dpcd_addr = DPCD_ADJUST_REQUEST_LANE0_1 + (lane_num / 2);
 418
 419         ret = exynos_dp_read_byte_from_dpcd(dpcd_addr, &buf);
 420         if (ret != EXYNOS_DP_SUCCESS) {
 421                 printf("DP read adjust request failed\n");
 422                 return -EAGAIN;
 423         }
 424
 425         *sw = ((buf >> shift_val[lane_num]) & 0x03);
 426         *em = ((buf >> shift_val[lane_num]) & 0x0c) >> 2;
 427
 428         return ret;
 429 }
 430
 431 static int exynos_dp_equalizer_err_link(struct edp_device_info *edp_info)
 432 {
 433         int ret;
 434
 435         ret = exynos_dp_training_pattern_dis();
 436         if (ret != EXYNOS_DP_SUCCESS) {
 437                 printf("DP training_patter_disable() failed\n");
 438                 edp_info->lt_info.lt_status = DP_LT_FAIL;
 439         }
 440
 441         ret = exynos_dp_set_enhanced_mode(edp_info->dpcd_efc);
 442         if (ret != EXYNOS_DP_SUCCESS) {
 443                 printf("DP set_enhanced_mode() failed\n");
 444                 edp_info->lt_info.lt_status = DP_LT_FAIL;
 445         }
 446
 447         return ret;
 448 }
 449
 450 static int exynos_dp_reduce_link_rate(struct edp_device_info *edp_info)
 451 {
 452         int ret;
 453
 454         if (edp_info->lane_bw == DP_LANE_BW_2_70) {
 455                 edp_info->lane_bw = DP_LANE_BW_1_62;
 456                 printf("DP Change lane bw to 1.62Gbps\n");
 457                 edp_info->lt_info.lt_status = DP_LT_START;
 458                 ret = EXYNOS_DP_SUCCESS;
 459         } else {
 460                 ret = exynos_dp_training_pattern_dis();
 461                 if (ret != EXYNOS_DP_SUCCESS)
 462                         printf("DP training_patter_disable() failed\n");
 463
 464                 ret = exynos_dp_set_enhanced_mode(edp_info->dpcd_efc);
 465                 if (ret != EXYNOS_DP_SUCCESS)
 466                         printf("DP set_enhanced_mode() failed\n");
 467
 468                 edp_info->lt_info.lt_status = DP_LT_FAIL;
 469         }
 470
 471         return ret;
 472 }
 473
 474 static unsigned int exynos_dp_process_clock_recovery(struct edp_device_info
 475                                                         *edp_info)
 476 {
 477         unsigned int ret = EXYNOS_DP_SUCCESS;
 478         unsigned char lane_stat;
 479         unsigned char lt_ctl_val[DP_LANE_CNT_4] = {0, };
 480         unsigned int i;
 481         unsigned char adj_req_sw;
 482         unsigned char adj_req_em;
 483         unsigned char buf[5];
 484
 485         debug("DP: %s was called\n", __func__);
 486         mdelay(1);
 487
 488         ret = exynos_dp_read_dpcd_lane_stat(edp_info, &lane_stat);
 489         if (ret != EXYNOS_DP_SUCCESS) {
 490                         printf("DP read lane status failed\n");
 491                         edp_info->lt_info.lt_status = DP_LT_FAIL;
 492                         return ret;
 493         }
 494
 495         if (lane_stat & DP_LANE_STAT_CR_DONE) {
 496                 debug("DP clock Recovery training succeed\n");
 497                 exynos_dp_set_training_pattern(TRAINING_PTN2);
 498
 499                 for (i = 0; i < edp_info->lane_cnt; i++) {
 500                         ret = exynos_dp_read_dpcd_adj_req(i, &adj_req_sw,
 501                                         &adj_req_em);
 502                         if (ret != EXYNOS_DP_SUCCESS) {
 503                                 edp_info->lt_info.lt_status = DP_LT_FAIL;
 504                                 return ret;
 505                         }
 506
 507                         lt_ctl_val[i] = 0;
 508                         lt_ctl_val[i] = adj_req_em << 3 | adj_req_sw;
 509
 510                         if ((adj_req_sw == VOLTAGE_LEVEL_3)
 511                                 || (adj_req_em == PRE_EMPHASIS_LEVEL_3)) {
 512                                 lt_ctl_val[i] |= MAX_DRIVE_CURRENT_REACH_3 |
 513                                         MAX_PRE_EMPHASIS_REACH_3;
 514                         }
 515                         exynos_dp_set_lanex_pre_emphasis(lt_ctl_val[i], i);
 516                 }
 517
 518                 buf[0] =  DPCD_SCRAMBLING_DISABLED | DPCD_TRAINING_PATTERN_2;
 519                 buf[1] = lt_ctl_val[0];
 520                 buf[2] = lt_ctl_val[1];
 521                 buf[3] = lt_ctl_val[2];
 522                 buf[4] = lt_ctl_val[3];
 523
 524                 ret = exynos_dp_write_bytes_to_dpcd(
 525                                 DPCD_TRAINING_PATTERN_SET, 5, buf);
 526                 if (ret != EXYNOS_DP_SUCCESS) {
 527                         printf("DP write traning pattern1 failed\n");
 528                         edp_info->lt_info.lt_status = DP_LT_FAIL;
 529                         return ret;
 530                 } else
 531                         edp_info->lt_info.lt_status = DP_LT_ET;
 532         } else {
 533                 for (i = 0; i < edp_info->lane_cnt; i++) {
 534                         lt_ctl_val[i] = exynos_dp_get_lanex_pre_emphasis(i);
 535                                 ret = exynos_dp_read_dpcd_adj_req(i,
 536                                                 &adj_req_sw, &adj_req_em);
 537                         if (ret != EXYNOS_DP_SUCCESS) {
 538                                 printf("DP read adj req failed\n");
 539                                 edp_info->lt_info.lt_status = DP_LT_FAIL;
 540                                 return ret;
 541                         }
 542
 543                         if ((adj_req_sw == VOLTAGE_LEVEL_3) ||
 544                                         (adj_req_em == PRE_EMPHASIS_LEVEL_3))
 545                                 ret = exynos_dp_reduce_link_rate(edp_info);
 546
 547                         if ((DRIVE_CURRENT_SET_0_GET(lt_ctl_val[i]) ==
 548                                                 adj_req_sw) &&
 549                                 (PRE_EMPHASIS_SET_0_GET(lt_ctl_val[i]) ==
 550                                                 adj_req_em)) {
 551                                 edp_info->lt_info.cr_loop[i]++;
 552                                 if (edp_info->lt_info.cr_loop[i] == MAX_CR_LOOP)
 553                                         ret = exynos_dp_reduce_link_rate(
 554                                                         edp_info);
 555                         }
 556
 557                         lt_ctl_val[i] = 0;
 558                         lt_ctl_val[i] = adj_req_em << 3 | adj_req_sw;
 559
 560                         if ((adj_req_sw == VOLTAGE_LEVEL_3) ||
 561                                         (adj_req_em == PRE_EMPHASIS_LEVEL_3)) {
 562                                 lt_ctl_val[i] |= MAX_DRIVE_CURRENT_REACH_3 |
 563                                         MAX_PRE_EMPHASIS_REACH_3;
 564                         }
 565                         exynos_dp_set_lanex_pre_emphasis(lt_ctl_val[i], i);
 566                 }
 567
 568                 ret = exynos_dp_write_bytes_to_dpcd(
 569                                 DPCD_TRAINING_LANE0_SET, 4, lt_ctl_val);
 570                 if (ret != EXYNOS_DP_SUCCESS) {
 571                         printf("DP write traning pattern2 failed\n");
 572                         edp_info->lt_info.lt_status = DP_LT_FAIL;
 573                         return ret;
 574                 }
 575         }
 576
 577         return ret;
 578 }
 579
 580 static unsigned int exynos_dp_process_equalizer_training(struct edp_device_info
 581                 *edp_info)
 582 {
 583         unsigned int ret = EXYNOS_DP_SUCCESS;
 584         unsigned char lane_stat, adj_req_sw, adj_req_em, i;
 585         unsigned char lt_ctl_val[DP_LANE_CNT_4] = {0,};
 586         unsigned char interlane_aligned = 0;
 587         unsigned char f_bw;
 588         unsigned char f_lane_cnt;
 589         unsigned char sink_stat;
 590
 591         mdelay(1);
 592
 593         ret = exynos_dp_read_dpcd_lane_stat(edp_info, &lane_stat);
 594         if (ret != EXYNOS_DP_SUCCESS) {
 595                 printf("DP read lane status failed\n");
 596                 edp_info->lt_info.lt_status = DP_LT_FAIL;
 597                 return ret;
 598         }
 599
 600         debug("DP lane stat : %x\n", lane_stat);
 601
 602         if (lane_stat & DP_LANE_STAT_CR_DONE) {
 603                 ret = exynos_dp_read_byte_from_dpcd(DPCD_LN_ALIGN_UPDATED,
 604                                 &sink_stat);
 605                 if (ret != EXYNOS_DP_SUCCESS) {
 606                         edp_info->lt_info.lt_status = DP_LT_FAIL;
 607
 608                         return ret;
 609                 }
 610
 611                 interlane_aligned = (sink_stat & DPCD_INTERLANE_ALIGN_DONE);
 612
 613                 for (i = 0; i < edp_info->lane_cnt; i++) {
 614                         ret = exynos_dp_read_dpcd_adj_req(i,
 615                                         &adj_req_sw, &adj_req_em);
 616                         if (ret != EXYNOS_DP_SUCCESS) {
 617                                 printf("DP read adj req 1 failed\n");
 618                                 edp_info->lt_info.lt_status = DP_LT_FAIL;
 619
 620                                 return ret;
 621                         }
 622
 623                         lt_ctl_val[i] = 0;
 624                         lt_ctl_val[i] = adj_req_em << 3 | adj_req_sw;
 625
 626                         if ((adj_req_sw == VOLTAGE_LEVEL_3) ||
 627                                 (adj_req_em == PRE_EMPHASIS_LEVEL_3)) {
 628                                 lt_ctl_val[i] |= MAX_DRIVE_CURRENT_REACH_3;
 629                                 lt_ctl_val[i] |= MAX_PRE_EMPHASIS_REACH_3;
 630                         }
 631                 }
 632
 633                 if (((lane_stat&DP_LANE_STAT_CE_DONE) &&
 634                         (lane_stat&DP_LANE_STAT_SYM_LOCK))
 635                         && (interlane_aligned == DPCD_INTERLANE_ALIGN_DONE)) {
 636                         debug("DP Equalizer training succeed\n");
 637
 638                         f_bw = exynos_dp_get_link_bandwidth();
 639                         f_lane_cnt = exynos_dp_get_lane_count();
 640
 641                         debug("DP final BandWidth : %x\n", f_bw);
 642                         debug("DP final Lane Count : %x\n", f_lane_cnt);
 643
 644                         edp_info->lt_info.lt_status = DP_LT_FINISHED;
 645
 646                         exynos_dp_equalizer_err_link(edp_info);
 647
 648                 } else {
 649                         edp_info->lt_info.ep_loop++;
 650
 651                         if (edp_info->lt_info.ep_loop > MAX_EQ_LOOP) {
 652                                 if (edp_info->lane_bw == DP_LANE_BW_2_70) {
 653                                         ret = exynos_dp_reduce_link_rate(
 654                                                         edp_info);
 655                                 } else {
 656                                         edp_info->lt_info.lt_status =
 657                                                                 DP_LT_FAIL;
 658                                         exynos_dp_equalizer_err_link(edp_info);
 659                                 }
 660                         } else {
 661                                 for (i = 0; i < edp_info->lane_cnt; i++)
 662                                         exynos_dp_set_lanex_pre_emphasis(
 663                                                         lt_ctl_val[i], i);
 664
 665                                 ret = exynos_dp_write_bytes_to_dpcd(
 666                                         DPCD_TRAINING_LANE0_SET,
 667                                         4, lt_ctl_val);
 668                                 if (ret != EXYNOS_DP_SUCCESS) {
 669                                         printf("DP set lt pattern failed\n");
 670                                         edp_info->lt_info.lt_status =
 671                                                                 DP_LT_FAIL;
 672                                         exynos_dp_equalizer_err_link(edp_info);
 673                                 }
 674                         }
 675                 }
 676         } else if (edp_info->lane_bw == DP_LANE_BW_2_70) {
 677                 ret = exynos_dp_reduce_link_rate(edp_info);
 678         } else {
 679                 edp_info->lt_info.lt_status = DP_LT_FAIL;
 680                 exynos_dp_equalizer_err_link(edp_info);
 681         }
 682
 683         return ret;
 684 }
 685
 686 static unsigned int exynos_dp_sw_link_training(struct edp_device_info *edp_info)
 687 {
 688         unsigned int ret = 0;
 689         int training_finished;
 690
 691         /* Turn off unnecessary lane */
 692         if (edp_info->lane_cnt == 1)
 693                 exynos_dp_set_analog_power_down(CH1_BLOCK, 1);
 694
 695         training_finished = 0;
 696
 697         edp_info->lt_info.lt_status = DP_LT_START;
 698
 699         /* Process here */
 700         while (!training_finished) {
 701                 switch (edp_info->lt_info.lt_status) {
 702                 case DP_LT_START:
 703                         ret = exynos_dp_link_start(edp_info);
 704                         if (ret != EXYNOS_DP_SUCCESS) {
 705                                 printf("DP LT:link start failed\n");
 706                                 return ret;
 707                         }
 708                         break;
 709                 case DP_LT_CR:
 710                         ret = exynos_dp_process_clock_recovery(edp_info);
 711                         if (ret != EXYNOS_DP_SUCCESS) {
 712                                 printf("DP LT:clock recovery failed\n");
 713                                 return ret;
 714                         }
 715                         break;
 716                 case DP_LT_ET:
 717                         ret = exynos_dp_process_equalizer_training(edp_info);
 718                         if (ret != EXYNOS_DP_SUCCESS) {
 719                                 printf("DP LT:equalizer training failed\n");
 720                                 return ret;
 721                         }
 722                         break;
 723                 case DP_LT_FINISHED:
 724                         training_finished = 1;
 725                         break;
 726                 case DP_LT_FAIL:
 727                         return -1;
 728                 }
 729         }
 730
 731         return ret;
 732 }
 733
 734 static unsigned int exynos_dp_set_link_train(struct edp_device_info *edp_info)
 735 {
 736         unsigned int ret;
 737
 738         exynos_dp_init_training();
 739
 740         ret = exynos_dp_sw_link_training(edp_info);
 741         if (ret != EXYNOS_DP_SUCCESS)
 742                 printf("DP dp_sw_link_traning() failed\n");
 743
 744         return ret;
 745 }
 746
 747 static void exynos_dp_enable_scramble(unsigned int enable)
 748 {
 749         unsigned char data;
 750
 751         if (enable) {
 752                 exynos_dp_enable_scrambling(DP_ENABLE);
 753
 754                 exynos_dp_read_byte_from_dpcd(DPCD_TRAINING_PATTERN_SET,
 755                                 &data);
 756                 exynos_dp_write_byte_to_dpcd(DPCD_TRAINING_PATTERN_SET,
 757                         (u8)(data & ~DPCD_SCRAMBLING_DISABLED));
 758         } else {
 759                 exynos_dp_enable_scrambling(DP_DISABLE);
 760                 exynos_dp_read_byte_from_dpcd(DPCD_TRAINING_PATTERN_SET,
 761                                 &data);
 762                 exynos_dp_write_byte_to_dpcd(DPCD_TRAINING_PATTERN_SET,
 763                         (u8)(data | DPCD_SCRAMBLING_DISABLED));
 764         }
 765 }
 766
 767 static unsigned int exynos_dp_config_video(struct edp_device_info *edp_info)
 768 {
 769         unsigned int ret = 0;
 770         unsigned int retry_cnt;
 771
 772         mdelay(1);
 773
 774         if (edp_info->video_info.master_mode) {
 775                 printf("DP does not support master mode\n");
 776                 return -ENODEV;
 777         } else {
 778                 /* debug slave */
 779                 exynos_dp_config_video_slave_mode(&edp_info->video_info);
 780         }
 781
 782         exynos_dp_set_video_color_format(&edp_info->video_info);
 783
 784         if (edp_info->video_info.bist_mode) {
 785                 if (exynos_dp_config_video_bist(edp_info) != 0)
 786                         return -1;
 787         }
 788
 789         ret = exynos_dp_get_pll_lock_status();
 790         if (ret != PLL_LOCKED) {
 791                 printf("DP PLL is not locked yet\n");
 792                 return -EIO;
 793         }
 794
 795         if (edp_info->video_info.master_mode == 0) {
 796                 retry_cnt = 10;
 797                 while (retry_cnt) {
 798                         ret = exynos_dp_is_slave_video_stream_clock_on();
 799                         if (ret != EXYNOS_DP_SUCCESS) {
 800                                 if (retry_cnt == 0) {
 801                                         printf("DP stream_clock_on failed\n");
 802                                         return ret;
 803                                 }
 804                                 retry_cnt--;
 805                                 mdelay(1);
 806                         } else
 807                                 break;
 808                 }
 809         }
 810
 811         /* Set to use the register calculated M/N video */
 812         exynos_dp_set_video_cr_mn(CALCULATED_M, 0, 0);
 813
 814         /* For video bist, Video timing must be generated by register */
 815         exynos_dp_set_video_timing_mode(VIDEO_TIMING_FROM_CAPTURE);
 816
 817         /* Enable video bist */
 818         if (edp_info->video_info.bist_pattern != COLOR_RAMP &&
 819                 edp_info->video_info.bist_pattern != BALCK_WHITE_V_LINES &&
 820                 edp_info->video_info.bist_pattern != COLOR_SQUARE)
 821                 exynos_dp_enable_video_bist(edp_info->video_info.bist_mode);
 822         else
 823                 exynos_dp_enable_video_bist(DP_DISABLE);
 824
 825         /* Disable video mute */
 826         exynos_dp_enable_video_mute(DP_DISABLE);
 827
 828         /* Configure video Master or Slave mode */
 829         exynos_dp_enable_video_master(edp_info->video_info.master_mode);
 830
 831         /* Enable video */
 832         exynos_dp_start_video();
 833
 834         if (edp_info->video_info.master_mode == 0) {
 835                 retry_cnt = 100;
 836                 while (retry_cnt) {
 837                         ret = exynos_dp_is_video_stream_on();
 838                         if (ret != EXYNOS_DP_SUCCESS) {
 839                                 if (retry_cnt == 0) {
 840                                         printf("DP Timeout of video stream\n");
 841                                         return ret;
 842                                 }
 843                                 retry_cnt--;
 844                                 mdelay(5);
 845                         } else
 846                                 break;
 847                 }
 848         }
 849
 850         return ret;
 851 }
 852
 853 #ifdef CONFIG_OF_CONTROL
 854 int exynos_dp_parse_dt(const void *blob, struct edp_device_info *edp_info)
 855 {
 856         unsigned int node = fdtdec_next_compatible(blob, 0,
 857                                                 COMPAT_SAMSUNG_EXYNOS5_DP);
 858         if (node <= 0) {
 859                 debug("exynos_dp: Can't get device node for dp\n");
 860                 return -ENODEV;
 861         }
 862
 863         edp_info->disp_info.h_res = fdtdec_get_int(blob, node,
 864                                                         "samsung,h-res", 0);
 865         edp_info->disp_info.h_sync_width = fdtdec_get_int(blob, node,
 866                                                 "samsung,h-sync-width", 0);
 867         edp_info->disp_info.h_back_porch = fdtdec_get_int(blob, node,
 868                                                 "samsung,h-back-porch", 0);
 869         edp_info->disp_info.h_front_porch = fdtdec_get_int(blob, node,
 870                                                 "samsung,h-front-porch", 0);
 871         edp_info->disp_info.v_res = fdtdec_get_int(blob, node,
 872                                                 "samsung,v-res", 0);
 873         edp_info->disp_info.v_sync_width = fdtdec_get_int(blob, node,
 874                                                 "samsung,v-sync-width", 0);
 875         edp_info->disp_info.v_back_porch = fdtdec_get_int(blob, node,
 876                                                 "samsung,v-back-porch", 0);
 877         edp_info->disp_info.v_front_porch = fdtdec_get_int(blob, node,
 878                                                 "samsung,v-front-porch", 0);
 879         edp_info->disp_info.v_sync_rate = fdtdec_get_int(blob, node,
 880                                                 "samsung,v-sync-rate", 0);
 881
 882         edp_info->lt_info.lt_status = fdtdec_get_int(blob, node,
 883                                                 "samsung,lt-status", 0);
 884
 885         edp_info->video_info.master_mode = fdtdec_get_int(blob, node,
 886                                                 "samsung,master-mode", 0);
 887         edp_info->video_info.bist_mode = fdtdec_get_int(blob, node,
 888                                                 "samsung,bist-mode", 0);
 889         edp_info->video_info.bist_pattern = fdtdec_get_int(blob, node,
 890                                                 "samsung,bist-pattern", 0);
 891         edp_info->video_info.h_sync_polarity = fdtdec_get_int(blob, node,
 892                                                 "samsung,h-sync-polarity", 0);
 893         edp_info->video_info.v_sync_polarity = fdtdec_get_int(blob, node,
 894                                                 "samsung,v-sync-polarity", 0);
 895         edp_info->video_info.interlaced = fdtdec_get_int(blob, node,
 896                                                 "samsung,interlaced", 0);
 897         edp_info->video_info.color_space = fdtdec_get_int(blob, node,
 898                                                 "samsung,color-space", 0);
 899         edp_info->video_info.dynamic_range = fdtdec_get_int(blob, node,
 900                                                 "samsung,dynamic-range", 0);
 901         edp_info->video_info.ycbcr_coeff = fdtdec_get_int(blob, node,
 902                                                 "samsung,ycbcr-coeff", 0);
 903         edp_info->video_info.color_depth = fdtdec_get_int(blob, node,
 904                                                 "samsung,color-depth", 0);
 905         return 0;
 906 }
 907 #endif
 908
 909 unsigned int exynos_init_dp(void)
 910 {
 911         unsigned int ret;
 912         struct edp_device_info *edp_info;
 913
 914         edp_info = kzalloc(sizeof(struct edp_device_info), GFP_KERNEL);
 915         if (!edp_info) {
 916                 debug("failed to allocate edp device object.\n");
 917                 return -EFAULT;
 918         }
 919
 920 #ifdef CONFIG_OF_CONTROL
 921         if (exynos_dp_parse_dt(gd->fdt_blob, edp_info))
 922                 debug("unable to parse DP DT node\n");
 923 #else
 924         edp_info = dp_pd->edp_dev_info;
 925         if (edp_info == NULL) {
 926                 debug("failed to get edp_info data.\n");
 927                 return -EFAULT;
 928         }
 929 #endif
 930
 931         exynos_dp_set_base_addr();
 932
 933         exynos_dp_disp_info(&edp_info->disp_info);
 934
 935         exynos_set_dp_phy(1);
 936
 937         ret = exynos_dp_init_dp();
 938         if (ret != EXYNOS_DP_SUCCESS) {
 939                 printf("DP exynos_dp_init_dp() failed\n");
 940                 return ret;
 941         }
 942
 943         ret = exynos_dp_handle_edid(edp_info);
 944         if (ret != EXYNOS_DP_SUCCESS) {
 945                 printf("EDP handle_edid fail\n");
 946                 return ret;
 947         }
 948
 949         ret = exynos_dp_set_link_train(edp_info);
 950         if (ret != EXYNOS_DP_SUCCESS) {
 951                 printf("DP link training fail\n");
 952                 return ret;
 953         }
 954
 955         exynos_dp_enable_scramble(DP_ENABLE);
 956         exynos_dp_enable_rx_to_enhanced_mode(DP_ENABLE);
 957         exynos_dp_enable_enhanced_mode(DP_ENABLE);
 958
 959         exynos_dp_set_link_bandwidth(edp_info->lane_bw);
 960         exynos_dp_set_lane_count(edp_info->lane_cnt);
 961
 962         exynos_dp_init_video();
 963         ret = exynos_dp_config_video(edp_info);
 964         if (ret != EXYNOS_DP_SUCCESS) {
 965                 printf("Exynos DP init failed\n");
 966                 return ret;
 967         }
 968
 969         printf("Exynos DP init done\n");
 970
 971         return ret;
 972 }
 973
 974 void exynos_set_dp_platform_data(struct exynos_dp_platform_data *pd)
 975 {
 976         if (pd == NULL) {
 977                 debug("pd is NULL\n");
 978                 return;
 979         }
 980
 981         dp_pd = pd;
 982 }