drivers/gpu/drm/bridge/analogix/analogix_dp_core.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3 * Analogix DP (Display Port) core interface driver.
   4 *
   5 * Copyright (C) 2012 Samsung Electronics Co., Ltd.
   6 * Author: Jingoo Han <[email protected]>
   7 */
   8
   9 #include <linux/clk.h>
  10 #include <linux/component.h>
  11 #include <linux/err.h>
  12 #include <linux/gpio/consumer.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/io.h>
  15 #include <linux/iopoll.h>
  16 #include <linux/module.h>
  17 #include <linux/of.h>
  18 #include <linux/phy/phy.h>
  19 #include <linux/platform_device.h>
  20
  21 #include <drm/bridge/analogix_dp.h>
  22 #include <drm/drm_atomic.h>
  23 #include <drm/drm_atomic_helper.h>
  24 #include <drm/drm_bridge.h>
  25 #include <drm/drm_crtc.h>
  26 #include <drm/drm_device.h>
  27 #include <drm/drm_panel.h>
  28 #include <drm/drm_print.h>
  29 #include <drm/drm_probe_helper.h>
  30
  31 #include "analogix_dp_core.h"
  32 #include "analogix_dp_reg.h"
  33
  34 #define to_dp(nm)       container_of(nm, struct analogix_dp_device, nm)
  35
  36 static const bool verify_fast_training;
  37
  38 struct bridge_init {
  39         struct i2c_client *client;
  40         struct device_node *node;
  41 };
  42
  43 static int analogix_dp_init_dp(struct analogix_dp_device *dp)
  44 {
  45         int ret;
  46
  47         analogix_dp_reset(dp);
  48
  49         analogix_dp_swreset(dp);
  50
  51         analogix_dp_init_analog_param(dp);
  52         analogix_dp_init_interrupt(dp);
  53
  54         /* SW defined function Normal operation */
  55         analogix_dp_enable_sw_function(dp);
  56
  57         analogix_dp_config_interrupt(dp);
  58         ret = analogix_dp_init_analog_func(dp);
  59         if (ret)
  60                 return ret;
  61
  62         analogix_dp_init_hpd(dp);
  63         analogix_dp_init_aux(dp);
  64         return 0;
  65 }
  66
  67 static int analogix_dp_detect_hpd(struct analogix_dp_device *dp)
  68 {
  69         int timeout_loop = 0;
  70
  71         while (timeout_loop < DP_TIMEOUT_LOOP_COUNT) {
  72                 if (analogix_dp_get_plug_in_status(dp) == 0)
  73                         return 0;
  74
  75                 timeout_loop++;
  76                 usleep_range(1000, 1100);
  77         }
  78
  79         /*
  80          * Some edp screen do not have hpd signal, so we can't just
  81          * return failed when hpd plug in detect failed, DT property
  82          * "force-hpd" would indicate whether driver need this.
  83          */
  84         if (!dp->force_hpd)
  85                 return -ETIMEDOUT;
  86
  87         /*
  88          * The eDP TRM indicate that if HPD_STATUS(RO) is 0, AUX CH
  89          * will not work, so we need to give a force hpd action to
  90          * set HPD_STATUS manually.
  91          */
  92         dev_dbg(dp->dev, "failed to get hpd plug status, try to force hpd\n");
  93
  94         analogix_dp_force_hpd(dp);
  95
  96         if (analogix_dp_get_plug_in_status(dp) != 0) {
  97                 dev_err(dp->dev, "failed to get hpd plug in status\n");
  98                 return -EINVAL;
  99         }
 100
 101         dev_dbg(dp->dev, "success to get plug in status after force hpd\n");
 102
 103         return 0;
 104 }
 105
 106 static bool analogix_dp_detect_sink_psr(struct analogix_dp_device *dp)
 107 {
 108         unsigned char psr_version;
 109         int ret;
 110
 111         ret = drm_dp_dpcd_readb(&dp->aux, DP_PSR_SUPPORT, &psr_version);
 112         if (ret != 1) {
 113                 dev_err(dp->dev, "failed to get PSR version, disable it\n");
 114                 return false;
 115         }
 116
 117         dev_dbg(dp->dev, "Panel PSR version : %x\n", psr_version);
 118         return psr_version & DP_PSR_IS_SUPPORTED;
 119 }
 120
 121 static int analogix_dp_enable_sink_psr(struct analogix_dp_device *dp)
 122 {
 123         unsigned char psr_en;
 124         int ret;
 125
 126         /* Disable psr function */
 127         ret = drm_dp_dpcd_readb(&dp->aux, DP_PSR_EN_CFG, &psr_en);
 128         if (ret != 1) {
 129                 dev_err(dp->dev, "failed to get psr config\n");
 130                 goto end;
 131         }
 132
 133         psr_en &= ~DP_PSR_ENABLE;
 134         ret = drm_dp_dpcd_writeb(&dp->aux, DP_PSR_EN_CFG, psr_en);
 135         if (ret != 1) {
 136                 dev_err(dp->dev, "failed to disable panel psr\n");
 137                 goto end;
 138         }
 139
 140         /* Main-Link transmitter remains active during PSR active states */
 141         psr_en = DP_PSR_CRC_VERIFICATION;
 142         ret = drm_dp_dpcd_writeb(&dp->aux, DP_PSR_EN_CFG, psr_en);
 143         if (ret != 1) {
 144                 dev_err(dp->dev, "failed to set panel psr\n");
 145                 goto end;
 146         }
 147
 148         /* Enable psr function */
 149         psr_en = DP_PSR_ENABLE | DP_PSR_CRC_VERIFICATION;
 150         ret = drm_dp_dpcd_writeb(&dp->aux, DP_PSR_EN_CFG, psr_en);
 151         if (ret != 1) {
 152                 dev_err(dp->dev, "failed to set panel psr\n");
 153                 goto end;
 154         }
 155
 156         analogix_dp_enable_psr_crc(dp);
 157
 158         dp->psr_supported = true;
 159
 160         return 0;
 161 end:
 162         dev_err(dp->dev, "enable psr fail, force to disable psr\n");
 163
 164         return ret;
 165 }
 166
 167 static int
 168 analogix_dp_enable_rx_to_enhanced_mode(struct analogix_dp_device *dp,
 169                                        bool enable)
 170 {
 171         u8 data;
 172         int ret;
 173
 174         ret = drm_dp_dpcd_readb(&dp->aux, DP_LANE_COUNT_SET, &data);
 175         if (ret != 1)
 176                 return ret;
 177
 178         if (enable)
 179                 ret = drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET,
 180                                          DP_LANE_COUNT_ENHANCED_FRAME_EN |
 181                                          DPCD_LANE_COUNT_SET(data));
 182         else
 183                 ret = drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET,
 184                                          DPCD_LANE_COUNT_SET(data));
 185
 186         return ret < 0 ? ret : 0;
 187 }
 188
 189 static int analogix_dp_is_enhanced_mode_available(struct analogix_dp_device *dp,
 190                                                   u8 *enhanced_mode_support)
 191 {
 192         u8 data;
 193         int ret;
 194
 195         ret = drm_dp_dpcd_readb(&dp->aux, DP_MAX_LANE_COUNT, &data);
 196         if (ret != 1) {
 197                 *enhanced_mode_support = 0;
 198                 return ret;
 199         }
 200
 201         *enhanced_mode_support = DPCD_ENHANCED_FRAME_CAP(data);
 202
 203         return 0;
 204 }
 205
 206 static int analogix_dp_set_enhanced_mode(struct analogix_dp_device *dp)
 207 {
 208         u8 data;
 209         int ret;
 210
 211         ret = analogix_dp_is_enhanced_mode_available(dp, &data);
 212         if (ret < 0)
 213                 return ret;
 214
 215         ret = analogix_dp_enable_rx_to_enhanced_mode(dp, data);
 216         if (ret < 0)
 217                 return ret;
 218
 219         analogix_dp_enable_enhanced_mode(dp, data);
 220
 221         return 0;
 222 }
 223
 224 static int analogix_dp_training_pattern_dis(struct analogix_dp_device *dp)
 225 {
 226         int ret;
 227
 228         analogix_dp_set_training_pattern(dp, DP_NONE);
 229
 230         ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
 231                                  DP_TRAINING_PATTERN_DISABLE);
 232
 233         return ret < 0 ? ret : 0;
 234 }
 235
 236 static void
 237 analogix_dp_set_lane_lane_pre_emphasis(struct analogix_dp_device *dp,
 238                                        int pre_emphasis, int lane)
 239 {
 240         switch (lane) {
 241         case 0:
 242                 analogix_dp_set_lane0_pre_emphasis(dp, pre_emphasis);
 243                 break;
 244         case 1:
 245                 analogix_dp_set_lane1_pre_emphasis(dp, pre_emphasis);
 246                 break;
 247
 248         case 2:
 249                 analogix_dp_set_lane2_pre_emphasis(dp, pre_emphasis);
 250                 break;
 251
 252         case 3:
 253                 analogix_dp_set_lane3_pre_emphasis(dp, pre_emphasis);
 254                 break;
 255         }
 256 }
 257
 258 static int analogix_dp_link_start(struct analogix_dp_device *dp)
 259 {
 260         u8 buf[4];
 261         int lane, lane_count, pll_tries, retval;
 262
 263         lane_count = dp->link_train.lane_count;
 264
 265         dp->link_train.lt_state = CLOCK_RECOVERY;
 266         dp->link_train.eq_loop = 0;
 267
 268         for (lane = 0; lane < lane_count; lane++)
 269                 dp->link_train.cr_loop[lane] = 0;
 270
 271         /* Set link rate and count as you want to establish*/
 272         analogix_dp_set_link_bandwidth(dp, dp->link_train.link_rate);
 273         analogix_dp_set_lane_count(dp, dp->link_train.lane_count);
 274
 275         /* Setup RX configuration */
 276         buf[0] = dp->link_train.link_rate;
 277         buf[1] = dp->link_train.lane_count;
 278         retval = drm_dp_dpcd_write(&dp->aux, DP_LINK_BW_SET, buf, 2);
 279         if (retval < 0)
 280                 return retval;
 281         /* set enhanced mode if available */
 282         retval = analogix_dp_set_enhanced_mode(dp);
 283         if (retval < 0) {
 284                 dev_err(dp->dev, "failed to set enhance mode\n");
 285                 return retval;
 286         }
 287
 288         /* Set TX pre-emphasis to minimum */
 289         for (lane = 0; lane < lane_count; lane++)
 290                 analogix_dp_set_lane_lane_pre_emphasis(dp,
 291                         PRE_EMPHASIS_LEVEL_0, lane);
 292
 293         /* Wait for PLL lock */
 294         pll_tries = 0;
 295         while (analogix_dp_get_pll_lock_status(dp) == PLL_UNLOCKED) {
 296                 if (pll_tries == DP_TIMEOUT_LOOP_COUNT) {
 297                         dev_err(dp->dev, "Wait for PLL lock timed out\n");
 298                         return -ETIMEDOUT;
 299                 }
 300
 301                 pll_tries++;
 302                 usleep_range(90, 120);
 303         }
 304
 305         /* Set training pattern 1 */
 306         analogix_dp_set_training_pattern(dp, TRAINING_PTN1);
 307
 308         /* Set RX training pattern */
 309         retval = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
 310                                     DP_LINK_SCRAMBLING_DISABLE |
 311                                         DP_TRAINING_PATTERN_1);
 312         if (retval < 0)
 313                 return retval;
 314
 315         for (lane = 0; lane < lane_count; lane++)
 316                 buf[lane] = DP_TRAIN_PRE_EMPH_LEVEL_0 |
 317                             DP_TRAIN_VOLTAGE_SWING_LEVEL_0;
 318
 319         retval = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET, buf,
 320                                    lane_count);
 321         if (retval < 0)
 322                 return retval;
 323
 324         return 0;
 325 }
 326
 327 static unsigned char analogix_dp_get_lane_status(u8 link_status[2], int lane)
 328 {
 329         int shift = (lane & 1) * 4;
 330         u8 link_value = link_status[lane >> 1];
 331
 332         return (link_value >> shift) & 0xf;
 333 }
 334
 335 static int analogix_dp_clock_recovery_ok(u8 link_status[2], int lane_count)
 336 {
 337         int lane;
 338         u8 lane_status;
 339
 340         for (lane = 0; lane < lane_count; lane++) {
 341                 lane_status = analogix_dp_get_lane_status(link_status, lane);
 342                 if ((lane_status & DP_LANE_CR_DONE) == 0)
 343                         return -EINVAL;
 344         }
 345         return 0;
 346 }
 347
 348 static int analogix_dp_channel_eq_ok(u8 link_status[2], u8 link_align,
 349                                      int lane_count)
 350 {
 351         int lane;
 352         u8 lane_status;
 353
 354         if ((link_align & DP_INTERLANE_ALIGN_DONE) == 0)
 355                 return -EINVAL;
 356
 357         for (lane = 0; lane < lane_count; lane++) {
 358                 lane_status = analogix_dp_get_lane_status(link_status, lane);
 359                 lane_status &= DP_CHANNEL_EQ_BITS;
 360                 if (lane_status != DP_CHANNEL_EQ_BITS)
 361                         return -EINVAL;
 362         }
 363
 364         return 0;
 365 }
 366
 367 static unsigned char
 368 analogix_dp_get_adjust_request_voltage(u8 adjust_request[2], int lane)
 369 {
 370         int shift = (lane & 1) * 4;
 371         u8 link_value = adjust_request[lane >> 1];
 372
 373         return (link_value >> shift) & 0x3;
 374 }
 375
 376 static unsigned char analogix_dp_get_adjust_request_pre_emphasis(
 377                                         u8 adjust_request[2],
 378                                         int lane)
 379 {
 380         int shift = (lane & 1) * 4;
 381         u8 link_value = adjust_request[lane >> 1];
 382
 383         return ((link_value >> shift) & 0xc) >> 2;
 384 }
 385
 386 static void analogix_dp_set_lane_link_training(struct analogix_dp_device *dp,
 387                                                u8 training_lane_set, int lane)
 388 {
 389         switch (lane) {
 390         case 0:
 391                 analogix_dp_set_lane0_link_training(dp, training_lane_set);
 392                 break;
 393         case 1:
 394                 analogix_dp_set_lane1_link_training(dp, training_lane_set);
 395                 break;
 396
 397         case 2:
 398                 analogix_dp_set_lane2_link_training(dp, training_lane_set);
 399                 break;
 400
 401         case 3:
 402                 analogix_dp_set_lane3_link_training(dp, training_lane_set);
 403                 break;
 404         }
 405 }
 406
 407 static unsigned int
 408 analogix_dp_get_lane_link_training(struct analogix_dp_device *dp,
 409                                    int lane)
 410 {
 411         u32 reg;
 412
 413         switch (lane) {
 414         case 0:
 415                 reg = analogix_dp_get_lane0_link_training(dp);
 416                 break;
 417         case 1:
 418                 reg = analogix_dp_get_lane1_link_training(dp);
 419                 break;
 420         case 2:
 421                 reg = analogix_dp_get_lane2_link_training(dp);
 422                 break;
 423         case 3:
 424                 reg = analogix_dp_get_lane3_link_training(dp);
 425                 break;
 426         default:
 427                 WARN_ON(1);
 428                 return 0;
 429         }
 430
 431         return reg;
 432 }
 433
 434 static void analogix_dp_reduce_link_rate(struct analogix_dp_device *dp)
 435 {
 436         analogix_dp_training_pattern_dis(dp);
 437         analogix_dp_set_enhanced_mode(dp);
 438
 439         dp->link_train.lt_state = FAILED;
 440 }
 441
 442 static void analogix_dp_get_adjust_training_lane(struct analogix_dp_device *dp,
 443                                                  u8 adjust_request[2])
 444 {
 445         int lane, lane_count;
 446         u8 voltage_swing, pre_emphasis, training_lane;
 447
 448         lane_count = dp->link_train.lane_count;
 449         for (lane = 0; lane < lane_count; lane++) {
 450                 voltage_swing = analogix_dp_get_adjust_request_voltage(
 451                                                 adjust_request, lane);
 452                 pre_emphasis = analogix_dp_get_adjust_request_pre_emphasis(
 453                                                 adjust_request, lane);
 454                 training_lane = DPCD_VOLTAGE_SWING_SET(voltage_swing) |
 455                                 DPCD_PRE_EMPHASIS_SET(pre_emphasis);
 456
 457                 if (voltage_swing == VOLTAGE_LEVEL_3)
 458                         training_lane |= DP_TRAIN_MAX_SWING_REACHED;
 459                 if (pre_emphasis == PRE_EMPHASIS_LEVEL_3)
 460                         training_lane |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
 461
 462                 dp->link_train.training_lane[lane] = training_lane;
 463         }
 464 }
 465
 466 static int analogix_dp_process_clock_recovery(struct analogix_dp_device *dp)
 467 {
 468         int lane, lane_count, retval;
 469         u8 voltage_swing, pre_emphasis, training_lane;
 470         u8 link_status[2], adjust_request[2];
 471
 472         usleep_range(100, 101);
 473
 474         lane_count = dp->link_train.lane_count;
 475
 476         retval = drm_dp_dpcd_read(&dp->aux, DP_LANE0_1_STATUS, link_status, 2);
 477         if (retval < 0)
 478                 return retval;
 479
 480         retval = drm_dp_dpcd_read(&dp->aux, DP_ADJUST_REQUEST_LANE0_1,
 481                                   adjust_request, 2);
 482         if (retval < 0)
 483                 return retval;
 484
 485         if (analogix_dp_clock_recovery_ok(link_status, lane_count) == 0) {
 486                 /* set training pattern 2 for EQ */
 487                 analogix_dp_set_training_pattern(dp, TRAINING_PTN2);
 488
 489                 retval = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
 490                                             DP_LINK_SCRAMBLING_DISABLE |
 491                                                 DP_TRAINING_PATTERN_2);
 492                 if (retval < 0)
 493                         return retval;
 494
 495                 dev_dbg(dp->dev, "Link Training Clock Recovery success\n");
 496                 dp->link_train.lt_state = EQUALIZER_TRAINING;
 497         } else {
 498                 for (lane = 0; lane < lane_count; lane++) {
 499                         training_lane = analogix_dp_get_lane_link_training(
 500                                                         dp, lane);
 501                         voltage_swing = analogix_dp_get_adjust_request_voltage(
 502                                                         adjust_request, lane);
 503                         pre_emphasis = analogix_dp_get_adjust_request_pre_emphasis(
 504                                                         adjust_request, lane);
 505
 506                         if (DPCD_VOLTAGE_SWING_GET(training_lane) ==
 507                                         voltage_swing &&
 508                             DPCD_PRE_EMPHASIS_GET(training_lane) ==
 509                                         pre_emphasis)
 510                                 dp->link_train.cr_loop[lane]++;
 511
 512                         if (dp->link_train.cr_loop[lane] == MAX_CR_LOOP ||
 513                             voltage_swing == VOLTAGE_LEVEL_3 ||
 514                             pre_emphasis == PRE_EMPHASIS_LEVEL_3) {
 515                                 dev_err(dp->dev, "CR Max reached (%d,%d,%d)\n",
 516                                         dp->link_train.cr_loop[lane],
 517                                         voltage_swing, pre_emphasis);
 518                                 analogix_dp_reduce_link_rate(dp);
 519                                 return -EIO;
 520                         }
 521                 }
 522         }
 523
 524         analogix_dp_get_adjust_training_lane(dp, adjust_request);
 525
 526         for (lane = 0; lane < lane_count; lane++)
 527                 analogix_dp_set_lane_link_training(dp,
 528                         dp->link_train.training_lane[lane], lane);
 529
 530         retval = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET,
 531                                    dp->link_train.training_lane, lane_count);
 532         if (retval < 0)
 533                 return retval;
 534
 535         return 0;
 536 }
 537
 538 static int analogix_dp_process_equalizer_training(struct analogix_dp_device *dp)
 539 {
 540         int lane, lane_count, retval;
 541         u32 reg;
 542         u8 link_align, link_status[2], adjust_request[2];
 543
 544         usleep_range(400, 401);
 545
 546         lane_count = dp->link_train.lane_count;
 547
 548         retval = drm_dp_dpcd_read(&dp->aux, DP_LANE0_1_STATUS, link_status, 2);
 549         if (retval < 0)
 550                 return retval;
 551
 552         if (analogix_dp_clock_recovery_ok(link_status, lane_count)) {
 553                 analogix_dp_reduce_link_rate(dp);
 554                 return -EIO;
 555         }
 556
 557         retval = drm_dp_dpcd_read(&dp->aux, DP_ADJUST_REQUEST_LANE0_1,
 558                                   adjust_request, 2);
 559         if (retval < 0)
 560                 return retval;
 561
 562         retval = drm_dp_dpcd_readb(&dp->aux, DP_LANE_ALIGN_STATUS_UPDATED,
 563                                    &link_align);
 564         if (retval < 0)
 565                 return retval;
 566
 567         analogix_dp_get_adjust_training_lane(dp, adjust_request);
 568
 569         if (!analogix_dp_channel_eq_ok(link_status, link_align, lane_count)) {
 570                 /* traing pattern Set to Normal */
 571                 retval = analogix_dp_training_pattern_dis(dp);
 572                 if (retval < 0)
 573                         return retval;
 574
 575                 dev_dbg(dp->dev, "Link Training success!\n");
 576                 analogix_dp_get_link_bandwidth(dp, &reg);
 577                 dp->link_train.link_rate = reg;
 578                 dev_dbg(dp->dev, "final bandwidth = %.2x\n",
 579                         dp->link_train.link_rate);
 580
 581                 analogix_dp_get_lane_count(dp, &reg);
 582                 dp->link_train.lane_count = reg;
 583                 dev_dbg(dp->dev, "final lane count = %.2x\n",
 584                         dp->link_train.lane_count);
 585
 586                 dp->link_train.lt_state = FINISHED;
 587
 588                 return 0;
 589         }
 590
 591         /* not all locked */
 592         dp->link_train.eq_loop++;
 593
 594         if (dp->link_train.eq_loop > MAX_EQ_LOOP) {
 595                 dev_err(dp->dev, "EQ Max loop\n");
 596                 analogix_dp_reduce_link_rate(dp);
 597                 return -EIO;
 598         }
 599
 600         for (lane = 0; lane < lane_count; lane++)
 601                 analogix_dp_set_lane_link_training(dp,
 602                         dp->link_train.training_lane[lane], lane);
 603
 604         retval = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET,
 605                                    dp->link_train.training_lane, lane_count);
 606         if (retval < 0)
 607                 return retval;
 608
 609         return 0;
 610 }
 611
 612 static void analogix_dp_get_max_rx_bandwidth(struct analogix_dp_device *dp,
 613                                              u8 *bandwidth)
 614 {
 615         u8 data;
 616
 617         /*
 618          * For DP rev.1.1, Maximum link rate of Main Link lanes
 619          * 0x06 = 1.62 Gbps, 0x0a = 2.7 Gbps
 620          * For DP rev.1.2, Maximum link rate of Main Link lanes
 621          * 0x06 = 1.62 Gbps, 0x0a = 2.7 Gbps, 0x14 = 5.4Gbps
 622          */
 623         drm_dp_dpcd_readb(&dp->aux, DP_MAX_LINK_RATE, &data);
 624         *bandwidth = data;
 625 }
 626
 627 static void analogix_dp_get_max_rx_lane_count(struct analogix_dp_device *dp,
 628                                               u8 *lane_count)
 629 {
 630         u8 data;
 631
 632         /*
 633          * For DP rev.1.1, Maximum number of Main Link lanes
 634          * 0x01 = 1 lane, 0x02 = 2 lanes, 0x04 = 4 lanes
 635          */
 636         drm_dp_dpcd_readb(&dp->aux, DP_MAX_LANE_COUNT, &data);
 637         *lane_count = DPCD_MAX_LANE_COUNT(data);
 638 }
 639
 640 static int analogix_dp_full_link_train(struct analogix_dp_device *dp,
 641                                        u32 max_lanes, u32 max_rate)
 642 {
 643         int retval = 0;
 644         bool training_finished = false;
 645
 646         /*
 647          * MACRO_RST must be applied after the PLL_LOCK to avoid
 648          * the DP inter pair skew issue for at least 10 us
 649          */
 650         analogix_dp_reset_macro(dp);
 651
 652         /* Initialize by reading RX's DPCD */
 653         analogix_dp_get_max_rx_bandwidth(dp, &dp->link_train.link_rate);
 654         analogix_dp_get_max_rx_lane_count(dp, &dp->link_train.lane_count);
 655
 656         if ((dp->link_train.link_rate != DP_LINK_BW_1_62) &&
 657             (dp->link_train.link_rate != DP_LINK_BW_2_7) &&
 658             (dp->link_train.link_rate != DP_LINK_BW_5_4)) {
 659                 dev_err(dp->dev, "Rx Max Link Rate is abnormal :%x !\n",
 660                         dp->link_train.link_rate);
 661                 dp->link_train.link_rate = DP_LINK_BW_1_62;
 662         }
 663
 664         if (dp->link_train.lane_count == 0) {
 665                 dev_err(dp->dev, "Rx Max Lane count is abnormal :%x !\n",
 666                         dp->link_train.lane_count);
 667                 dp->link_train.lane_count = (u8)LANE_COUNT1;
 668         }
 669
 670         /* Setup TX lane count & rate */
 671         if (dp->link_train.lane_count > max_lanes)
 672                 dp->link_train.lane_count = max_lanes;
 673         if (dp->link_train.link_rate > max_rate)
 674                 dp->link_train.link_rate = max_rate;
 675
 676         /* All DP analog module power up */
 677         analogix_dp_set_analog_power_down(dp, POWER_ALL, 0);
 678
 679         dp->link_train.lt_state = START;
 680
 681         /* Process here */
 682         while (!retval && !training_finished) {
 683                 switch (dp->link_train.lt_state) {
 684                 case START:
 685                         retval = analogix_dp_link_start(dp);
 686                         if (retval)
 687                                 dev_err(dp->dev, "LT link start failed!\n");
 688                         break;
 689                 case CLOCK_RECOVERY:
 690                         retval = analogix_dp_process_clock_recovery(dp);
 691                         if (retval)
 692                                 dev_err(dp->dev, "LT CR failed!\n");
 693                         break;
 694                 case EQUALIZER_TRAINING:
 695                         retval = analogix_dp_process_equalizer_training(dp);
 696                         if (retval)
 697                                 dev_err(dp->dev, "LT EQ failed!\n");
 698                         break;
 699                 case FINISHED:
 700                         training_finished = 1;
 701                         break;
 702                 case FAILED:
 703                         return -EREMOTEIO;
 704                 }
 705         }
 706         if (retval)
 707                 dev_err(dp->dev, "eDP link training failed (%d)\n", retval);
 708
 709         return retval;
 710 }
 711
 712 static int analogix_dp_fast_link_train(struct analogix_dp_device *dp)
 713 {
 714         int i, ret;
 715         u8 link_align, link_status[2];
 716         enum pll_status status;
 717
 718         analogix_dp_reset_macro(dp);
 719
 720         analogix_dp_set_link_bandwidth(dp, dp->link_train.link_rate);
 721         analogix_dp_set_lane_count(dp, dp->link_train.lane_count);
 722
 723         for (i = 0; i < dp->link_train.lane_count; i++) {
 724                 analogix_dp_set_lane_link_training(dp,
 725                         dp->link_train.training_lane[i], i);
 726         }
 727
 728         ret = readx_poll_timeout(analogix_dp_get_pll_lock_status, dp, status,
 729                                  status != PLL_UNLOCKED, 120,
 730                                  120 * DP_TIMEOUT_LOOP_COUNT);
 731         if (ret) {
 732                 DRM_DEV_ERROR(dp->dev, "Wait for pll lock failed %d\n", ret);
 733                 return ret;
 734         }
 735
 736         /* source Set training pattern 1 */
 737         analogix_dp_set_training_pattern(dp, TRAINING_PTN1);
 738         /* From DP spec, pattern must be on-screen for a minimum 500us */
 739         usleep_range(500, 600);
 740
 741         analogix_dp_set_training_pattern(dp, TRAINING_PTN2);
 742         /* From DP spec, pattern must be on-screen for a minimum 500us */
 743         usleep_range(500, 600);
 744
 745         /* TODO: enhanced_mode?*/
 746         analogix_dp_set_training_pattern(dp, DP_NONE);
 747
 748         /*
 749          * Useful for debugging issues with fast link training, disable for more
 750          * speed
 751          */
 752         if (verify_fast_training) {
 753                 ret = drm_dp_dpcd_readb(&dp->aux, DP_LANE_ALIGN_STATUS_UPDATED,
 754                                         &link_align);
 755                 if (ret < 0) {
 756                         DRM_DEV_ERROR(dp->dev, "Read align status failed %d\n",
 757                                       ret);
 758                         return ret;
 759                 }
 760
 761                 ret = drm_dp_dpcd_read(&dp->aux, DP_LANE0_1_STATUS, link_status,
 762                                        2);
 763                 if (ret < 0) {
 764                         DRM_DEV_ERROR(dp->dev, "Read link status failed %d\n",
 765                                       ret);
 766                         return ret;
 767                 }
 768
 769                 if (analogix_dp_clock_recovery_ok(link_status,
 770                                                   dp->link_train.lane_count)) {
 771                         DRM_DEV_ERROR(dp->dev, "Clock recovery failed\n");
 772                         analogix_dp_reduce_link_rate(dp);
 773                         return -EIO;
 774                 }
 775
 776                 if (analogix_dp_channel_eq_ok(link_status, link_align,
 777                                               dp->link_train.lane_count)) {
 778                         DRM_DEV_ERROR(dp->dev, "Channel EQ failed\n");
 779                         analogix_dp_reduce_link_rate(dp);
 780                         return -EIO;
 781                 }
 782         }
 783
 784         return 0;
 785 }
 786
 787 static int analogix_dp_train_link(struct analogix_dp_device *dp)
 788 {
 789         if (dp->fast_train_enable)
 790                 return analogix_dp_fast_link_train(dp);
 791
 792         return analogix_dp_full_link_train(dp, dp->video_info.max_lane_count,
 793                                            dp->video_info.max_link_rate);
 794 }
 795
 796 static int analogix_dp_config_video(struct analogix_dp_device *dp)
 797 {
 798         int timeout_loop = 0;
 799         int done_count = 0;
 800
 801         analogix_dp_config_video_slave_mode(dp);
 802
 803         analogix_dp_set_video_color_format(dp);
 804
 805         if (analogix_dp_get_pll_lock_status(dp) == PLL_UNLOCKED) {
 806                 dev_err(dp->dev, "PLL is not locked yet.\n");
 807                 return -EINVAL;
 808         }
 809
 810         for (;;) {
 811                 timeout_loop++;
 812                 if (analogix_dp_is_slave_video_stream_clock_on(dp) == 0)
 813                         break;
 814                 if (timeout_loop > DP_TIMEOUT_LOOP_COUNT) {
 815                         dev_err(dp->dev, "Timeout of slave video streamclk ok\n");
 816                         return -ETIMEDOUT;
 817                 }
 818                 usleep_range(1000, 1001);
 819         }
 820
 821         /* Set to use the register calculated M/N video */
 822         analogix_dp_set_video_cr_mn(dp, CALCULATED_M, 0, 0);
 823
 824         /* For video bist, Video timing must be generated by register */
 825         analogix_dp_set_video_timing_mode(dp, VIDEO_TIMING_FROM_CAPTURE);
 826
 827         /* Disable video mute */
 828         analogix_dp_enable_video_mute(dp, 0);
 829
 830         /* Configure video slave mode */
 831         analogix_dp_enable_video_master(dp, 0);
 832
 833         /* Enable video */
 834         analogix_dp_start_video(dp);
 835
 836         timeout_loop = 0;
 837
 838         for (;;) {
 839                 timeout_loop++;
 840                 if (analogix_dp_is_video_stream_on(dp) == 0) {
 841                         done_count++;
 842                         if (done_count > 10)
 843                                 break;
 844                 } else if (done_count) {
 845                         done_count = 0;
 846                 }
 847                 if (timeout_loop > DP_TIMEOUT_LOOP_COUNT) {
 848                         dev_warn(dp->dev,
 849                                  "Ignoring timeout of video streamclk ok\n");
 850                         break;
 851                 }
 852
 853                 usleep_range(1000, 1001);
 854         }
 855
 856         return 0;
 857 }
 858
 859 static int analogix_dp_enable_scramble(struct analogix_dp_device *dp,
 860                                        bool enable)
 861 {
 862         u8 data;
 863         int ret;
 864
 865         if (enable) {
 866                 analogix_dp_enable_scrambling(dp);
 867
 868                 ret = drm_dp_dpcd_readb(&dp->aux, DP_TRAINING_PATTERN_SET,
 869                                         &data);
 870                 if (ret != 1)
 871                         return ret;
 872                 ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
 873                                    (u8)(data & ~DP_LINK_SCRAMBLING_DISABLE));
 874         } else {
 875                 analogix_dp_disable_scrambling(dp);
 876
 877                 ret = drm_dp_dpcd_readb(&dp->aux, DP_TRAINING_PATTERN_SET,
 878                                         &data);
 879                 if (ret != 1)
 880                         return ret;
 881                 ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
 882                                    (u8)(data | DP_LINK_SCRAMBLING_DISABLE));
 883         }
 884         return ret < 0 ? ret : 0;
 885 }
 886
 887 static irqreturn_t analogix_dp_hardirq(int irq, void *arg)
 888 {
 889         struct analogix_dp_device *dp = arg;
 890         irqreturn_t ret = IRQ_NONE;
 891         enum dp_irq_type irq_type;
 892
 893         irq_type = analogix_dp_get_irq_type(dp);
 894         if (irq_type != DP_IRQ_TYPE_UNKNOWN) {
 895                 analogix_dp_mute_hpd_interrupt(dp);
 896                 ret = IRQ_WAKE_THREAD;
 897         }
 898
 899         return ret;
 900 }
 901
 902 static irqreturn_t analogix_dp_irq_thread(int irq, void *arg)
 903 {
 904         struct analogix_dp_device *dp = arg;
 905         enum dp_irq_type irq_type;
 906
 907         irq_type = analogix_dp_get_irq_type(dp);
 908         if (irq_type & DP_IRQ_TYPE_HP_CABLE_IN ||
 909             irq_type & DP_IRQ_TYPE_HP_CABLE_OUT) {
 910                 dev_dbg(dp->dev, "Detected cable status changed!\n");
 911                 if (dp->drm_dev)
 912                         drm_helper_hpd_irq_event(dp->drm_dev);
 913         }
 914
 915         if (irq_type != DP_IRQ_TYPE_UNKNOWN) {
 916                 analogix_dp_clear_hotplug_interrupts(dp);
 917                 analogix_dp_unmute_hpd_interrupt(dp);
 918         }
 919
 920         return IRQ_HANDLED;
 921 }
 922
 923 static int analogix_dp_fast_link_train_detection(struct analogix_dp_device *dp)
 924 {
 925         int ret;
 926         u8 spread;
 927
 928         ret = drm_dp_dpcd_readb(&dp->aux, DP_MAX_DOWNSPREAD, &spread);
 929         if (ret != 1) {
 930                 dev_err(dp->dev, "failed to read downspread %d\n", ret);
 931                 return ret;
 932         }
 933         dp->fast_train_enable = !!(spread & DP_NO_AUX_HANDSHAKE_LINK_TRAINING);
 934         dev_dbg(dp->dev, "fast link training %s\n",
 935                 dp->fast_train_enable ? "supported" : "unsupported");
 936         return 0;
 937 }
 938
 939 static int analogix_dp_commit(struct analogix_dp_device *dp)
 940 {
 941         int ret;
 942
 943         /* Keep the panel disabled while we configure video */
 944         if (dp->plat_data->panel) {
 945                 if (drm_panel_disable(dp->plat_data->panel))
 946                         DRM_ERROR("failed to disable the panel\n");
 947         }
 948
 949         ret = analogix_dp_train_link(dp);
 950         if (ret) {
 951                 dev_err(dp->dev, "unable to do link train, ret=%d\n", ret);
 952                 return ret;
 953         }
 954
 955         ret = analogix_dp_enable_scramble(dp, 1);
 956         if (ret < 0) {
 957                 dev_err(dp->dev, "can not enable scramble\n");
 958                 return ret;
 959         }
 960
 961         analogix_dp_init_video(dp);
 962         ret = analogix_dp_config_video(dp);
 963         if (ret) {
 964                 dev_err(dp->dev, "unable to config video\n");
 965                 return ret;
 966         }
 967
 968         /* Safe to enable the panel now */
 969         if (dp->plat_data->panel) {
 970                 ret = drm_panel_enable(dp->plat_data->panel);
 971                 if (ret) {
 972                         DRM_ERROR("failed to enable the panel\n");
 973                         return ret;
 974                 }
 975         }
 976
 977         /* Check whether panel supports fast training */
 978         ret = analogix_dp_fast_link_train_detection(dp);
 979         if (ret)
 980                 return ret;
 981
 982         if (analogix_dp_detect_sink_psr(dp)) {
 983                 ret = analogix_dp_enable_sink_psr(dp);
 984                 if (ret)
 985                         return ret;
 986         }
 987
 988         return ret;
 989 }
 990
 991 static int analogix_dp_enable_psr(struct analogix_dp_device *dp)
 992 {
 993         struct dp_sdp psr_vsc;
 994         int ret;
 995         u8 sink;
 996
 997         ret = drm_dp_dpcd_readb(&dp->aux, DP_PSR_STATUS, &sink);
 998         if (ret != 1)
 999                 DRM_DEV_ERROR(dp->dev, "Failed to read psr status %d\n", ret);
1000         else if (sink == DP_PSR_SINK_ACTIVE_RFB)
1001                 return 0;
1002
1003         /* Prepare VSC packet as per EDP 1.4 spec, Table 6.9 */
1004         memset(&psr_vsc, 0, sizeof(psr_vsc));
1005         psr_vsc.sdp_header.HB0 = 0;
1006         psr_vsc.sdp_header.HB1 = 0x7;
1007         psr_vsc.sdp_header.HB2 = 0x2;
1008         psr_vsc.sdp_header.HB3 = 0x8;
1009         psr_vsc.db[0] = 0;
1010         psr_vsc.db[1] = EDP_VSC_PSR_STATE_ACTIVE | EDP_VSC_PSR_CRC_VALUES_VALID;
1011
1012         ret = analogix_dp_send_psr_spd(dp, &psr_vsc, true);
1013         if (!ret)
1014                 analogix_dp_set_analog_power_down(dp, POWER_ALL, true);
1015
1016         return ret;
1017 }
1018
1019 static int analogix_dp_disable_psr(struct analogix_dp_device *dp)
1020 {
1021         struct dp_sdp psr_vsc;
1022         int ret;
1023         u8 sink;
1024
1025         analogix_dp_set_analog_power_down(dp, POWER_ALL, false);
1026
1027         ret = drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
1028         if (ret != 1) {
1029                 DRM_DEV_ERROR(dp->dev, "Failed to set DP Power0 %d\n", ret);
1030                 return ret;
1031         }
1032
1033         ret = drm_dp_dpcd_readb(&dp->aux, DP_PSR_STATUS, &sink);
1034         if (ret != 1) {
1035                 DRM_DEV_ERROR(dp->dev, "Failed to read psr status %d\n", ret);
1036                 return ret;
1037         } else if (sink == DP_PSR_SINK_INACTIVE) {
1038                 DRM_DEV_ERROR(dp->dev, "sink inactive, skip disable psr");
1039                 return 0;
1040         }
1041
1042         ret = analogix_dp_train_link(dp);
1043         if (ret) {
1044                 DRM_DEV_ERROR(dp->dev, "Failed to train the link %d\n", ret);
1045                 return ret;
1046         }
1047
1048         /* Prepare VSC packet as per EDP 1.4 spec, Table 6.9 */
1049         memset(&psr_vsc, 0, sizeof(psr_vsc));
1050         psr_vsc.sdp_header.HB0 = 0;
1051         psr_vsc.sdp_header.HB1 = 0x7;
1052         psr_vsc.sdp_header.HB2 = 0x2;
1053         psr_vsc.sdp_header.HB3 = 0x8;
1054
1055         psr_vsc.db[0] = 0;
1056         psr_vsc.db[1] = 0;
1057
1058         return analogix_dp_send_psr_spd(dp, &psr_vsc, true);
1059 }
1060
1061 /*
1062  * This function is a bit of a catch-all for panel preparation, hopefully
1063  * simplifying the logic of functions that need to prepare/unprepare the panel
1064  * below.
1065  *
1066  * If @prepare is true, this function will prepare the panel. Conversely, if it
1067  * is false, the panel will be unprepared.
1068  *
1069  * If @is_modeset_prepare is true, the function will disregard the current state
1070  * of the panel and either prepare/unprepare the panel based on @prepare. Once
1071  * it finishes, it will update dp->panel_is_modeset to reflect the current state
1072  * of the panel.
1073  */
1074 static int analogix_dp_prepare_panel(struct analogix_dp_device *dp,
1075                                      bool prepare, bool is_modeset_prepare)
1076 {
1077         int ret = 0;
1078
1079         if (!dp->plat_data->panel)
1080                 return 0;
1081
1082         mutex_lock(&dp->panel_lock);
1083
1084         /*
1085          * Exit early if this is a temporary prepare/unprepare and we're already
1086          * modeset (since we neither want to prepare twice or unprepare early).
1087          */
1088         if (dp->panel_is_modeset && !is_modeset_prepare)
1089                 goto out;
1090
1091         if (prepare)
1092                 ret = drm_panel_prepare(dp->plat_data->panel);
1093         else
1094                 ret = drm_panel_unprepare(dp->plat_data->panel);
1095
1096         if (ret)
1097                 goto out;
1098
1099         if (is_modeset_prepare)
1100                 dp->panel_is_modeset = prepare;
1101
1102 out:
1103         mutex_unlock(&dp->panel_lock);
1104         return ret;
1105 }
1106
1107 static int analogix_dp_get_modes(struct drm_connector *connector)
1108 {
1109         struct analogix_dp_device *dp = to_dp(connector);
1110         struct edid *edid;
1111         int ret, num_modes = 0;
1112
1113         if (dp->plat_data->panel) {
1114                 num_modes += drm_panel_get_modes(dp->plat_data->panel, connector);
1115         } else {
1116                 ret = analogix_dp_prepare_panel(dp, true, false);
1117                 if (ret) {
1118                         DRM_ERROR("Failed to prepare panel (%d)\n", ret);
1119                         return 0;
1120                 }
1121
1122                 pm_runtime_get_sync(dp->dev);
1123                 edid = drm_get_edid(connector, &dp->aux.ddc);
1124                 pm_runtime_put(dp->dev);
1125                 if (edid) {
1126                         drm_connector_update_edid_property(&dp->connector,
1127                                                            edid);
1128                         num_modes += drm_add_edid_modes(&dp->connector, edid);
1129                         kfree(edid);
1130                 }
1131
1132                 ret = analogix_dp_prepare_panel(dp, false, false);
1133                 if (ret)
1134                         DRM_ERROR("Failed to unprepare panel (%d)\n", ret);
1135         }
1136
1137         if (dp->plat_data->get_modes)
1138                 num_modes += dp->plat_data->get_modes(dp->plat_data, connector);
1139
1140         return num_modes;
1141 }
1142
1143 static struct drm_encoder *
1144 analogix_dp_best_encoder(struct drm_connector *connector)
1145 {
1146         struct analogix_dp_device *dp = to_dp(connector);
1147
1148         return dp->encoder;
1149 }
1150
1151
1152 static int analogix_dp_atomic_check(struct drm_connector *connector,
1153                                     struct drm_atomic_state *state)
1154 {
1155         struct analogix_dp_device *dp = to_dp(connector);
1156         struct drm_connector_state *conn_state;
1157         struct drm_crtc_state *crtc_state;
1158
1159         conn_state = drm_atomic_get_new_connector_state(state, connector);
1160         if (WARN_ON(!conn_state))
1161                 return -ENODEV;
1162
1163         conn_state->self_refresh_aware = true;
1164
1165         if (!conn_state->crtc)
1166                 return 0;
1167
1168         crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
1169         if (!crtc_state)
1170                 return 0;
1171
1172         if (crtc_state->self_refresh_active && !dp->psr_supported)
1173                 return -EINVAL;
1174
1175         return 0;
1176 }
1177
1178 static const struct drm_connector_helper_funcs analogix_dp_connector_helper_funcs = {
1179         .get_modes = analogix_dp_get_modes,
1180         .best_encoder = analogix_dp_best_encoder,
1181         .atomic_check = analogix_dp_atomic_check,
1182 };
1183
1184 static enum drm_connector_status
1185 analogix_dp_detect(struct drm_connector *connector, bool force)
1186 {
1187         struct analogix_dp_device *dp = to_dp(connector);
1188         enum drm_connector_status status = connector_status_disconnected;
1189         int ret;
1190
1191         if (dp->plat_data->panel)
1192                 return connector_status_connected;
1193
1194         ret = analogix_dp_prepare_panel(dp, true, false);
1195         if (ret) {
1196                 DRM_ERROR("Failed to prepare panel (%d)\n", ret);
1197                 return connector_status_disconnected;
1198         }
1199
1200         if (!analogix_dp_detect_hpd(dp))
1201                 status = connector_status_connected;
1202
1203         ret = analogix_dp_prepare_panel(dp, false, false);
1204         if (ret)
1205                 DRM_ERROR("Failed to unprepare panel (%d)\n", ret);
1206
1207         return status;
1208 }
1209
1210 static const struct drm_connector_funcs analogix_dp_connector_funcs = {
1211         .fill_modes = drm_helper_probe_single_connector_modes,
1212         .detect = analogix_dp_detect,
1213         .destroy = drm_connector_cleanup,
1214         .reset = drm_atomic_helper_connector_reset,
1215         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
1216         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
1217 };
1218
1219 static int analogix_dp_bridge_attach(struct drm_bridge *bridge,
1220                                      enum drm_bridge_attach_flags flags)
1221 {
1222         struct analogix_dp_device *dp = bridge->driver_private;
1223         struct drm_encoder *encoder = dp->encoder;
1224         struct drm_connector *connector = NULL;
1225         int ret = 0;
1226
1227         if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
1228                 DRM_ERROR("Fix bridge driver to make connector optional!");
1229                 return -EINVAL;
1230         }
1231
1232         if (!bridge->encoder) {
1233                 DRM_ERROR("Parent encoder object not found");
1234                 return -ENODEV;
1235         }
1236
1237         if (!dp->plat_data->skip_connector) {
1238                 connector = &dp->connector;
1239                 connector->polled = DRM_CONNECTOR_POLL_HPD;
1240
1241                 ret = drm_connector_init(dp->drm_dev, connector,
1242                                          &analogix_dp_connector_funcs,
1243                                          DRM_MODE_CONNECTOR_eDP);
1244                 if (ret) {
1245                         DRM_ERROR("Failed to initialize connector with drm\n");
1246                         return ret;
1247                 }
1248
1249                 drm_connector_helper_add(connector,
1250                                          &analogix_dp_connector_helper_funcs);
1251                 drm_connector_attach_encoder(connector, encoder);
1252         }
1253
1254         /*
1255          * NOTE: the connector registration is implemented in analogix
1256          * platform driver, that to say connector would be exist after
1257          * plat_data->attch return, that's why we record the connector
1258          * point after plat attached.
1259          */
1260         if (dp->plat_data->attach) {
1261                 ret = dp->plat_data->attach(dp->plat_data, bridge, connector);
1262                 if (ret) {
1263                         DRM_ERROR("Failed at platform attach func\n");
1264                         return ret;
1265                 }
1266         }
1267
1268         if (dp->plat_data->panel) {
1269                 ret = drm_panel_attach(dp->plat_data->panel, &dp->connector);
1270                 if (ret) {
1271                         DRM_ERROR("Failed to attach panel\n");
1272                         return ret;
1273                 }
1274         }
1275
1276         return 0;
1277 }
1278
1279 static
1280 struct drm_crtc *analogix_dp_get_new_crtc(struct analogix_dp_device *dp,
1281                                           struct drm_atomic_state *state)
1282 {
1283         struct drm_encoder *encoder = dp->encoder;
1284         struct drm_connector *connector;
1285         struct drm_connector_state *conn_state;
1286
1287         connector = drm_atomic_get_new_connector_for_encoder(state, encoder);
1288         if (!connector)
1289                 return NULL;
1290
1291         conn_state = drm_atomic_get_new_connector_state(state, connector);
1292         if (!conn_state)
1293                 return NULL;
1294
1295         return conn_state->crtc;
1296 }
1297
1298 static void
1299 analogix_dp_bridge_atomic_pre_enable(struct drm_bridge *bridge,
1300                                      struct drm_bridge_state *old_bridge_state)
1301 {
1302         struct drm_atomic_state *old_state = old_bridge_state->base.state;
1303         struct analogix_dp_device *dp = bridge->driver_private;
1304         struct drm_crtc *crtc;
1305         struct drm_crtc_state *old_crtc_state;
1306         int ret;
1307
1308         crtc = analogix_dp_get_new_crtc(dp, old_state);
1309         if (!crtc)
1310                 return;
1311
1312         old_crtc_state = drm_atomic_get_old_crtc_state(old_state, crtc);
1313         /* Don't touch the panel if we're coming back from PSR */
1314         if (old_crtc_state && old_crtc_state->self_refresh_active)
1315                 return;
1316
1317         ret = analogix_dp_prepare_panel(dp, true, true);
1318         if (ret)
1319                 DRM_ERROR("failed to setup the panel ret = %d\n", ret);
1320 }
1321
1322 static int analogix_dp_set_bridge(struct analogix_dp_device *dp)
1323 {
1324         int ret;
1325
1326         pm_runtime_get_sync(dp->dev);
1327
1328         ret = clk_prepare_enable(dp->clock);
1329         if (ret < 0) {
1330                 DRM_ERROR("Failed to prepare_enable the clock clk [%d]\n", ret);
1331                 goto out_dp_clk_pre;
1332         }
1333
1334         if (dp->plat_data->power_on_start)
1335                 dp->plat_data->power_on_start(dp->plat_data);
1336
1337         phy_power_on(dp->phy);
1338
1339         ret = analogix_dp_init_dp(dp);
1340         if (ret)
1341                 goto out_dp_init;
1342
1343         /*
1344          * According to DP spec v1.3 chap 3.5.1.2 Link Training,
1345          * We should first make sure the HPD signal is asserted high by device
1346          * when we want to establish a link with it.
1347          */
1348         ret = analogix_dp_detect_hpd(dp);
1349         if (ret) {
1350                 DRM_ERROR("failed to get hpd single ret = %d\n", ret);
1351                 goto out_dp_init;
1352         }
1353
1354         ret = analogix_dp_commit(dp);
1355         if (ret) {
1356                 DRM_ERROR("dp commit error, ret = %d\n", ret);
1357                 goto out_dp_init;
1358         }
1359
1360         if (dp->plat_data->power_on_end)
1361                 dp->plat_data->power_on_end(dp->plat_data);
1362
1363         enable_irq(dp->irq);
1364         return 0;
1365
1366 out_dp_init:
1367         phy_power_off(dp->phy);
1368         if (dp->plat_data->power_off)
1369                 dp->plat_data->power_off(dp->plat_data);
1370         clk_disable_unprepare(dp->clock);
1371 out_dp_clk_pre:
1372         pm_runtime_put_sync(dp->dev);
1373
1374         return ret;
1375 }
1376
1377 static void
1378 analogix_dp_bridge_atomic_enable(struct drm_bridge *bridge,
1379                                  struct drm_bridge_state *old_bridge_state)
1380 {
1381         struct drm_atomic_state *old_state = old_bridge_state->base.state;
1382         struct analogix_dp_device *dp = bridge->driver_private;
1383         struct drm_crtc *crtc;
1384         struct drm_crtc_state *old_crtc_state;
1385         int timeout_loop = 0;
1386         int ret;
1387
1388         crtc = analogix_dp_get_new_crtc(dp, old_state);
1389         if (!crtc)
1390                 return;
1391
1392         old_crtc_state = drm_atomic_get_old_crtc_state(old_state, crtc);
1393         /* Not a full enable, just disable PSR and continue */
1394         if (old_crtc_state && old_crtc_state->self_refresh_active) {
1395                 ret = analogix_dp_disable_psr(dp);
1396                 if (ret)
1397                         DRM_ERROR("Failed to disable psr %d\n", ret);
1398                 return;
1399         }
1400
1401         if (dp->dpms_mode == DRM_MODE_DPMS_ON)
1402                 return;
1403
1404         while (timeout_loop < MAX_PLL_LOCK_LOOP) {
1405                 if (analogix_dp_set_bridge(dp) == 0) {
1406                         dp->dpms_mode = DRM_MODE_DPMS_ON;
1407                         return;
1408                 }
1409                 dev_err(dp->dev, "failed to set bridge, retry: %d\n",
1410                         timeout_loop);
1411                 timeout_loop++;
1412                 usleep_range(10, 11);
1413         }
1414         dev_err(dp->dev, "too many times retry set bridge, give it up\n");
1415 }
1416
1417 static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
1418 {
1419         struct analogix_dp_device *dp = bridge->driver_private;
1420         int ret;
1421
1422         if (dp->dpms_mode != DRM_MODE_DPMS_ON)
1423                 return;
1424
1425         if (dp->plat_data->panel) {
1426                 if (drm_panel_disable(dp->plat_data->panel)) {
1427                         DRM_ERROR("failed to disable the panel\n");
1428                         return;
1429                 }
1430         }
1431
1432         disable_irq(dp->irq);
1433
1434         if (dp->plat_data->power_off)
1435                 dp->plat_data->power_off(dp->plat_data);
1436
1437         analogix_dp_set_analog_power_down(dp, POWER_ALL, 1);
1438         phy_power_off(dp->phy);
1439
1440         clk_disable_unprepare(dp->clock);
1441
1442         pm_runtime_put_sync(dp->dev);
1443
1444         ret = analogix_dp_prepare_panel(dp, false, true);
1445         if (ret)
1446                 DRM_ERROR("failed to setup the panel ret = %d\n", ret);
1447
1448         dp->fast_train_enable = false;
1449         dp->psr_supported = false;
1450         dp->dpms_mode = DRM_MODE_DPMS_OFF;
1451 }
1452
1453 static void
1454 analogix_dp_bridge_atomic_disable(struct drm_bridge *bridge,
1455                                   struct drm_bridge_state *old_bridge_state)
1456 {
1457         struct drm_atomic_state *old_state = old_bridge_state->base.state;
1458         struct analogix_dp_device *dp = bridge->driver_private;
1459         struct drm_crtc *crtc;
1460         struct drm_crtc_state *new_crtc_state = NULL;
1461
1462         crtc = analogix_dp_get_new_crtc(dp, old_state);
1463         if (!crtc)
1464                 goto out;
1465
1466         new_crtc_state = drm_atomic_get_new_crtc_state(old_state, crtc);
1467         if (!new_crtc_state)
1468                 goto out;
1469
1470         /* Don't do a full disable on PSR transitions */
1471         if (new_crtc_state->self_refresh_active)
1472                 return;
1473
1474 out:
1475         analogix_dp_bridge_disable(bridge);
1476 }
1477
1478 static void
1479 analogix_dp_bridge_atomic_post_disable(struct drm_bridge *bridge,
1480                                 struct drm_bridge_state *old_bridge_state)
1481 {
1482         struct drm_atomic_state *old_state = old_bridge_state->base.state;
1483         struct analogix_dp_device *dp = bridge->driver_private;
1484         struct drm_crtc *crtc;
1485         struct drm_crtc_state *new_crtc_state;
1486         int ret;
1487
1488         crtc = analogix_dp_get_new_crtc(dp, old_state);
1489         if (!crtc)
1490                 return;
1491
1492         new_crtc_state = drm_atomic_get_new_crtc_state(old_state, crtc);
1493         if (!new_crtc_state || !new_crtc_state->self_refresh_active)
1494                 return;
1495
1496         ret = analogix_dp_enable_psr(dp);
1497         if (ret)
1498                 DRM_ERROR("Failed to enable psr (%d)\n", ret);
1499 }
1500
1501 static void analogix_dp_bridge_mode_set(struct drm_bridge *bridge,
1502                                 const struct drm_display_mode *orig_mode,
1503                                 const struct drm_display_mode *mode)
1504 {
1505         struct analogix_dp_device *dp = bridge->driver_private;
1506         struct drm_display_info *display_info = &dp->connector.display_info;
1507         struct video_info *video = &dp->video_info;
1508         struct device_node *dp_node = dp->dev->of_node;
1509         int vic;
1510
1511         /* Input video interlaces & hsync pol & vsync pol */
1512         video->interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
1513         video->v_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NVSYNC);
1514         video->h_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NHSYNC);
1515
1516         /* Input video dynamic_range & colorimetry */
1517         vic = drm_match_cea_mode(mode);
1518         if ((vic == 6) || (vic == 7) || (vic == 21) || (vic == 22) ||
1519             (vic == 2) || (vic == 3) || (vic == 17) || (vic == 18)) {
1520                 video->dynamic_range = CEA;
1521                 video->ycbcr_coeff = COLOR_YCBCR601;
1522         } else if (vic) {
1523                 video->dynamic_range = CEA;
1524                 video->ycbcr_coeff = COLOR_YCBCR709;
1525         } else {
1526                 video->dynamic_range = VESA;
1527                 video->ycbcr_coeff = COLOR_YCBCR709;
1528         }
1529
1530         /* Input vide bpc and color_formats */
1531         switch (display_info->bpc) {
1532         case 12:
1533                 video->color_depth = COLOR_12;
1534                 break;
1535         case 10:
1536                 video->color_depth = COLOR_10;
1537                 break;
1538         case 8:
1539                 video->color_depth = COLOR_8;
1540                 break;
1541         case 6:
1542                 video->color_depth = COLOR_6;
1543                 break;
1544         default:
1545                 video->color_depth = COLOR_8;
1546                 break;
1547         }
1548         if (display_info->color_formats & DRM_COLOR_FORMAT_YCRCB444)
1549                 video->color_space = COLOR_YCBCR444;
1550         else if (display_info->color_formats & DRM_COLOR_FORMAT_YCRCB422)
1551                 video->color_space = COLOR_YCBCR422;
1552         else
1553                 video->color_space = COLOR_RGB;
1554
1555         /*
1556          * NOTE: those property parsing code is used for providing backward
1557          * compatibility for samsung platform.
1558          * Due to we used the "of_property_read_u32" interfaces, when this
1559          * property isn't present, the "video_info" can keep the original
1560          * values and wouldn't be modified.
1561          */
1562         of_property_read_u32(dp_node, "samsung,color-space",
1563                              &video->color_space);
1564         of_property_read_u32(dp_node, "samsung,dynamic-range",
1565                              &video->dynamic_range);
1566         of_property_read_u32(dp_node, "samsung,ycbcr-coeff",
1567                              &video->ycbcr_coeff);
1568         of_property_read_u32(dp_node, "samsung,color-depth",
1569                              &video->color_depth);
1570         if (of_property_read_bool(dp_node, "hsync-active-high"))
1571                 video->h_sync_polarity = true;
1572         if (of_property_read_bool(dp_node, "vsync-active-high"))
1573                 video->v_sync_polarity = true;
1574         if (of_property_read_bool(dp_node, "interlaced"))
1575                 video->interlaced = true;
1576 }
1577
1578 static const struct drm_bridge_funcs analogix_dp_bridge_funcs = {
1579         .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
1580         .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
1581         .atomic_reset = drm_atomic_helper_bridge_reset,
1582         .atomic_pre_enable = analogix_dp_bridge_atomic_pre_enable,
1583         .atomic_enable = analogix_dp_bridge_atomic_enable,
1584         .atomic_disable = analogix_dp_bridge_atomic_disable,
1585         .atomic_post_disable = analogix_dp_bridge_atomic_post_disable,
1586         .mode_set = analogix_dp_bridge_mode_set,
1587         .attach = analogix_dp_bridge_attach,
1588 };
1589
1590 static int analogix_dp_create_bridge(struct drm_device *drm_dev,
1591                                      struct analogix_dp_device *dp)
1592 {
1593         struct drm_bridge *bridge;
1594         int ret;
1595
1596         bridge = devm_kzalloc(drm_dev->dev, sizeof(*bridge), GFP_KERNEL);
1597         if (!bridge) {
1598                 DRM_ERROR("failed to allocate for drm bridge\n");
1599                 return -ENOMEM;
1600         }
1601
1602         dp->bridge = bridge;
1603
1604         bridge->driver_private = dp;
1605         bridge->funcs = &analogix_dp_bridge_funcs;
1606
1607         ret = drm_bridge_attach(dp->encoder, bridge, NULL, 0);
1608         if (ret) {
1609                 DRM_ERROR("failed to attach drm bridge\n");
1610                 return -EINVAL;
1611         }
1612
1613         return 0;
1614 }
1615
1616 static int analogix_dp_dt_parse_pdata(struct analogix_dp_device *dp)
1617 {
1618         struct device_node *dp_node = dp->dev->of_node;
1619         struct video_info *video_info = &dp->video_info;
1620
1621         switch (dp->plat_data->dev_type) {
1622         case RK3288_DP:
1623         case RK3399_EDP:
1624                 /*
1625                  * Like Rk3288 DisplayPort TRM indicate that "Main link
1626                  * containing 4 physical lanes of 2.7/1.62 Gbps/lane".
1627                  */
1628                 video_info->max_link_rate = 0x0A;
1629                 video_info->max_lane_count = 0x04;
1630                 break;
1631         case EXYNOS_DP:
1632                 /*
1633                  * NOTE: those property parseing code is used for
1634                  * providing backward compatibility for samsung platform.
1635                  */
1636                 of_property_read_u32(dp_node, "samsung,link-rate",
1637                                      &video_info->max_link_rate);
1638                 of_property_read_u32(dp_node, "samsung,lane-count",
1639                                      &video_info->max_lane_count);
1640                 break;
1641         }
1642
1643         return 0;
1644 }
1645
1646 static ssize_t analogix_dpaux_transfer(struct drm_dp_aux *aux,
1647                                        struct drm_dp_aux_msg *msg)
1648 {
1649         struct analogix_dp_device *dp = to_dp(aux);
1650
1651         return analogix_dp_transfer(dp, msg);
1652 }
1653
1654 struct analogix_dp_device *
1655 analogix_dp_probe(struct device *dev, struct analogix_dp_plat_data *plat_data)
1656 {
1657         struct platform_device *pdev = to_platform_device(dev);
1658         struct analogix_dp_device *dp;
1659         struct resource *res;
1660         unsigned int irq_flags;
1661         int ret;
1662
1663         if (!plat_data) {
1664                 dev_err(dev, "Invalided input plat_data\n");
1665                 return ERR_PTR(-EINVAL);
1666         }
1667
1668         dp = devm_kzalloc(dev, sizeof(struct analogix_dp_device), GFP_KERNEL);
1669         if (!dp)
1670                 return ERR_PTR(-ENOMEM);
1671
1672         dp->dev = &pdev->dev;
1673         dp->dpms_mode = DRM_MODE_DPMS_OFF;
1674
1675         mutex_init(&dp->panel_lock);
1676         dp->panel_is_modeset = false;
1677
1678         /*
1679          * platform dp driver need containor_of the plat_data to get
1680          * the driver private data, so we need to store the point of
1681          * plat_data, not the context of plat_data.
1682          */
1683         dp->plat_data = plat_data;
1684
1685         ret = analogix_dp_dt_parse_pdata(dp);
1686         if (ret)
1687                 return ERR_PTR(ret);
1688
1689         dp->phy = devm_phy_get(dp->dev, "dp");
1690         if (IS_ERR(dp->phy)) {
1691                 dev_err(dp->dev, "no DP phy configured\n");
1692                 ret = PTR_ERR(dp->phy);
1693                 if (ret) {
1694                         /*
1695                          * phy itself is not enabled, so we can move forward
1696                          * assigning NULL to phy pointer.
1697                          */
1698                         if (ret == -ENOSYS || ret == -ENODEV)
1699                                 dp->phy = NULL;
1700                         else
1701                                 return ERR_PTR(ret);
1702                 }
1703         }
1704
1705         dp->clock = devm_clk_get(&pdev->dev, "dp");
1706         if (IS_ERR(dp->clock)) {
1707                 dev_err(&pdev->dev, "failed to get clock\n");
1708                 return ERR_CAST(dp->clock);
1709         }
1710
1711         clk_prepare_enable(dp->clock);
1712
1713         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1714
1715         dp->reg_base = devm_ioremap_resource(&pdev->dev, res);
1716         if (IS_ERR(dp->reg_base))
1717                 return ERR_CAST(dp->reg_base);
1718
1719         dp->force_hpd = of_property_read_bool(dev->of_node, "force-hpd");
1720
1721         /* Try two different names */
1722         dp->hpd_gpiod = devm_gpiod_get_optional(dev, "hpd", GPIOD_IN);
1723         if (!dp->hpd_gpiod)
1724                 dp->hpd_gpiod = devm_gpiod_get_optional(dev, "samsung,hpd",
1725                                                         GPIOD_IN);
1726         if (IS_ERR(dp->hpd_gpiod)) {
1727                 dev_err(dev, "error getting HDP GPIO: %ld\n",
1728                         PTR_ERR(dp->hpd_gpiod));
1729                 return ERR_CAST(dp->hpd_gpiod);
1730         }
1731
1732         if (dp->hpd_gpiod) {
1733                 /*
1734                  * Set up the hotplug GPIO from the device tree as an interrupt.
1735                  * Simply specifying a different interrupt in the device tree
1736                  * doesn't work since we handle hotplug rather differently when
1737                  * using a GPIO.  We also need the actual GPIO specifier so
1738                  * that we can get the current state of the GPIO.
1739                  */
1740                 dp->irq = gpiod_to_irq(dp->hpd_gpiod);
1741                 irq_flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
1742         } else {
1743                 dp->irq = platform_get_irq(pdev, 0);
1744                 irq_flags = 0;
1745         }
1746
1747         if (dp->irq == -ENXIO) {
1748                 dev_err(&pdev->dev, "failed to get irq\n");
1749                 return ERR_PTR(-ENODEV);
1750         }
1751
1752         ret = devm_request_threaded_irq(&pdev->dev, dp->irq,
1753                                         analogix_dp_hardirq,
1754                                         analogix_dp_irq_thread,
1755                                         irq_flags, "analogix-dp", dp);
1756         if (ret) {
1757                 dev_err(&pdev->dev, "failed to request irq\n");
1758                 return ERR_PTR(ret);
1759         }
1760         disable_irq(dp->irq);
1761
1762         return dp;
1763 }
1764 EXPORT_SYMBOL_GPL(analogix_dp_probe);
1765
1766 int analogix_dp_bind(struct analogix_dp_device *dp, struct drm_device *drm_dev)
1767 {
1768         int ret;
1769
1770         dp->drm_dev = drm_dev;
1771         dp->encoder = dp->plat_data->encoder;
1772
1773         dp->aux.name = "DP-AUX";
1774         dp->aux.transfer = analogix_dpaux_transfer;
1775         dp->aux.dev = dp->dev;
1776
1777         ret = drm_dp_aux_register(&dp->aux);
1778         if (ret)
1779                 return ret;
1780
1781         pm_runtime_enable(dp->dev);
1782
1783         ret = analogix_dp_create_bridge(drm_dev, dp);
1784         if (ret) {
1785                 DRM_ERROR("failed to create bridge (%d)\n", ret);
1786                 goto err_disable_pm_runtime;
1787         }
1788
1789         return 0;
1790
1791 err_disable_pm_runtime:
1792         pm_runtime_disable(dp->dev);
1793
1794         return ret;
1795 }
1796 EXPORT_SYMBOL_GPL(analogix_dp_bind);
1797
1798 void analogix_dp_unbind(struct analogix_dp_device *dp)
1799 {
1800         analogix_dp_bridge_disable(dp->bridge);
1801         dp->connector.funcs->destroy(&dp->connector);
1802
1803         if (dp->plat_data->panel) {
1804                 if (drm_panel_unprepare(dp->plat_data->panel))
1805                         DRM_ERROR("failed to turnoff the panel\n");
1806                 drm_panel_detach(dp->plat_data->panel);
1807         }
1808
1809         drm_dp_aux_unregister(&dp->aux);
1810         pm_runtime_disable(dp->dev);
1811 }
1812 EXPORT_SYMBOL_GPL(analogix_dp_unbind);
1813
1814 void analogix_dp_remove(struct analogix_dp_device *dp)
1815 {
1816         clk_disable_unprepare(dp->clock);
1817 }
1818 EXPORT_SYMBOL_GPL(analogix_dp_remove);
1819
1820 #ifdef CONFIG_PM
1821 int analogix_dp_suspend(struct analogix_dp_device *dp)
1822 {
1823         clk_disable_unprepare(dp->clock);
1824
1825         if (dp->plat_data->panel) {
1826                 if (drm_panel_unprepare(dp->plat_data->panel))
1827                         DRM_ERROR("failed to turnoff the panel\n");
1828         }
1829
1830         return 0;
1831 }
1832 EXPORT_SYMBOL_GPL(analogix_dp_suspend);
1833
1834 int analogix_dp_resume(struct analogix_dp_device *dp)
1835 {
1836         int ret;
1837
1838         ret = clk_prepare_enable(dp->clock);
1839         if (ret < 0) {
1840                 DRM_ERROR("Failed to prepare_enable the clock clk [%d]\n", ret);
1841                 return ret;
1842         }
1843
1844         if (dp->plat_data->panel) {
1845                 if (drm_panel_prepare(dp->plat_data->panel)) {
1846                         DRM_ERROR("failed to setup the panel\n");
1847                         return -EBUSY;
1848                 }
1849         }
1850
1851         return 0;
1852 }
1853 EXPORT_SYMBOL_GPL(analogix_dp_resume);
1854 #endif
1855
1856 int analogix_dp_start_crc(struct drm_connector *connector)
1857 {
1858         struct analogix_dp_device *dp = to_dp(connector);
1859
1860         if (!connector->state->crtc) {
1861                 DRM_ERROR("Connector %s doesn't currently have a CRTC.\n",
1862                           connector->name);
1863                 return -EINVAL;
1864         }
1865
1866         return drm_dp_start_crc(&dp->aux, connector->state->crtc);
1867 }
1868 EXPORT_SYMBOL_GPL(analogix_dp_start_crc);
1869
1870 int analogix_dp_stop_crc(struct drm_connector *connector)
1871 {
1872         struct analogix_dp_device *dp = to_dp(connector);
1873
1874         return drm_dp_stop_crc(&dp->aux);
1875 }
1876 EXPORT_SYMBOL_GPL(analogix_dp_stop_crc);
1877
1878 MODULE_AUTHOR("Jingoo Han <[email protected]>");
1879 MODULE_DESCRIPTION("Analogix DP Core Driver");
1880 MODULE_LICENSE("GPL v2");