drivers/gpu/drm/radeon/atombios_dp.c

   1 /*
   2  * Copyright 2007-8 Advanced Micro Devices, Inc.
   3  * Copyright 2008 Red Hat Inc.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  19  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  20  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  21  * OTHER DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors: Dave Airlie
  24  *          Alex Deucher
  25  */
  26 #include "drmP.h"
  27 #include "radeon_drm.h"
  28 #include "radeon.h"
  29
  30 #include "atom.h"
  31 #include "atom-bits.h"
  32 #include "drm_dp_helper.h"
  33
  34 /* move these to drm_dp_helper.c/h */
  35 #define DP_LINK_CONFIGURATION_SIZE 9
  36 #define DP_LINK_STATUS_SIZE        6
  37 #define DP_DPCD_SIZE               8
  38
  39 static char *voltage_names[] = {
  40         "0.4V", "0.6V", "0.8V", "1.2V"
  41 };
  42 static char *pre_emph_names[] = {
  43         "0dB", "3.5dB", "6dB", "9.5dB"
  44 };
  45
  46 static const int dp_clocks[] = {
  47         54000,  /* 1 lane, 1.62 Ghz */
  48         90000,  /* 1 lane, 2.70 Ghz */
  49         108000, /* 2 lane, 1.62 Ghz */
  50         180000, /* 2 lane, 2.70 Ghz */
  51         216000, /* 4 lane, 1.62 Ghz */
  52         360000, /* 4 lane, 2.70 Ghz */
  53 };
  54
  55 static const int num_dp_clocks = sizeof(dp_clocks) / sizeof(int);
  56
  57 /* common helper functions */
  58 static int dp_lanes_for_mode_clock(u8 dpcd[DP_DPCD_SIZE], int mode_clock)
  59 {
  60         int i;
  61         u8 max_link_bw;
  62         u8 max_lane_count;
  63
  64         if (!dpcd)
  65                 return 0;
  66
  67         max_link_bw = dpcd[DP_MAX_LINK_RATE];
  68         max_lane_count = dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;
  69
  70         switch (max_link_bw) {
  71         case DP_LINK_BW_1_62:
  72         default:
  73                 for (i = 0; i < num_dp_clocks; i++) {
  74                         if (i % 2)
  75                                 continue;
  76                         switch (max_lane_count) {
  77                         case 1:
  78                                 if (i > 1)
  79                                         return 0;
  80                                 break;
  81                         case 2:
  82                                 if (i > 3)
  83                                         return 0;
  84                                 break;
  85                         case 4:
  86                         default:
  87                                 break;
  88                         }
  89                         if (dp_clocks[i] > mode_clock) {
  90                                 if (i < 2)
  91                                         return 1;
  92                                 else if (i < 4)
  93                                         return 2;
  94                                 else
  95                                         return 4;
  96                         }
  97                 }
  98                 break;
  99         case DP_LINK_BW_2_7:
 100                 for (i = 0; i < num_dp_clocks; i++) {
 101                         switch (max_lane_count) {
 102                         case 1:
 103                                 if (i > 1)
 104                                         return 0;
 105                                 break;
 106                         case 2:
 107                                 if (i > 3)
 108                                         return 0;
 109                                 break;
 110                         case 4:
 111                         default:
 112                                 break;
 113                         }
 114                         if (dp_clocks[i] > mode_clock) {
 115                                 if (i < 2)
 116                                         return 1;
 117                                 else if (i < 4)
 118                                         return 2;
 119                                 else
 120                                         return 4;
 121                         }
 122                 }
 123                 break;
 124         }
 125
 126         return 0;
 127 }
 128
 129 static int dp_link_clock_for_mode_clock(u8 dpcd[DP_DPCD_SIZE], int mode_clock)
 130 {
 131         int i;
 132         u8 max_link_bw;
 133         u8 max_lane_count;
 134
 135         if (!dpcd)
 136                 return 0;
 137
 138         max_link_bw = dpcd[DP_MAX_LINK_RATE];
 139         max_lane_count = dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;
 140
 141         switch (max_link_bw) {
 142         case DP_LINK_BW_1_62:
 143         default:
 144                 for (i = 0; i < num_dp_clocks; i++) {
 145                         if (i % 2)
 146                                 continue;
 147                         switch (max_lane_count) {
 148                         case 1:
 149                                 if (i > 1)
 150                                         return 0;
 151                                 break;
 152                         case 2:
 153                                 if (i > 3)
 154                                         return 0;
 155                                 break;
 156                         case 4:
 157                         default:
 158                                 break;
 159                         }
 160                         if (dp_clocks[i] > mode_clock)
 161                                 return 162000;
 162                 }
 163                 break;
 164         case DP_LINK_BW_2_7:
 165                 for (i = 0; i < num_dp_clocks; i++) {
 166                         switch (max_lane_count) {
 167                         case 1:
 168                                 if (i > 1)
 169                                         return 0;
 170                                 break;
 171                         case 2:
 172                                 if (i > 3)
 173                                         return 0;
 174                                 break;
 175                         case 4:
 176                         default:
 177                                 break;
 178                         }
 179                         if (dp_clocks[i] > mode_clock)
 180                                 return (i % 2) ? 270000 : 162000;
 181                 }
 182         }
 183
 184         return 0;
 185 }
 186
 187 int dp_mode_valid(u8 dpcd[DP_DPCD_SIZE], int mode_clock)
 188 {
 189         int lanes = dp_lanes_for_mode_clock(dpcd, mode_clock);
 190         int bw = dp_lanes_for_mode_clock(dpcd, mode_clock);
 191
 192         if ((lanes == 0) || (bw == 0))
 193                 return MODE_CLOCK_HIGH;
 194
 195         return MODE_OK;
 196 }
 197
 198 static u8 dp_link_status(u8 link_status[DP_LINK_STATUS_SIZE], int r)
 199 {
 200         return link_status[r - DP_LANE0_1_STATUS];
 201 }
 202
 203 static u8 dp_get_lane_status(u8 link_status[DP_LINK_STATUS_SIZE],
 204                              int lane)
 205 {
 206         int i = DP_LANE0_1_STATUS + (lane >> 1);
 207         int s = (lane & 1) * 4;
 208         u8 l = dp_link_status(link_status, i);
 209         return (l >> s) & 0xf;
 210 }
 211
 212 static bool dp_clock_recovery_ok(u8 link_status[DP_LINK_STATUS_SIZE],
 213                                  int lane_count)
 214 {
 215         int lane;
 216         u8 lane_status;
 217
 218         for (lane = 0; lane < lane_count; lane++) {
 219                 lane_status = dp_get_lane_status(link_status, lane);
 220                 if ((lane_status & DP_LANE_CR_DONE) == 0)
 221                         return false;
 222         }
 223         return true;
 224 }
 225
 226 static bool dp_channel_eq_ok(u8 link_status[DP_LINK_STATUS_SIZE],
 227                              int lane_count)
 228 {
 229         u8 lane_align;
 230         u8 lane_status;
 231         int lane;
 232
 233         lane_align = dp_link_status(link_status,
 234                                     DP_LANE_ALIGN_STATUS_UPDATED);
 235         if ((lane_align & DP_INTERLANE_ALIGN_DONE) == 0)
 236                 return false;
 237         for (lane = 0; lane < lane_count; lane++) {
 238                 lane_status = dp_get_lane_status(link_status, lane);
 239                 if ((lane_status & DP_CHANNEL_EQ_BITS) != DP_CHANNEL_EQ_BITS)
 240                         return false;
 241         }
 242         return true;
 243 }
 244
 245 static u8 dp_get_adjust_request_voltage(uint8_t link_status[DP_LINK_STATUS_SIZE],
 246                                         int lane)
 247
 248 {
 249         int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1);
 250         int s = ((lane & 1) ?
 251                  DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT :
 252                  DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT);
 253         u8 l = dp_link_status(link_status, i);
 254
 255         return ((l >> s) & 0x3) << DP_TRAIN_VOLTAGE_SWING_SHIFT;
 256 }
 257
 258 static u8 dp_get_adjust_request_pre_emphasis(uint8_t link_status[DP_LINK_STATUS_SIZE],
 259                                              int lane)
 260 {
 261         int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1);
 262         int s = ((lane & 1) ?
 263                  DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT :
 264                  DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT);
 265         u8 l = dp_link_status(link_status, i);
 266
 267         return ((l >> s) & 0x3) << DP_TRAIN_PRE_EMPHASIS_SHIFT;
 268 }
 269
 270 /* XXX fix me -- chip specific */
 271 #define DP_VOLTAGE_MAX         DP_TRAIN_VOLTAGE_SWING_1200
 272 static u8 dp_pre_emphasis_max(u8 voltage_swing)
 273 {
 274         switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) {
 275         case DP_TRAIN_VOLTAGE_SWING_400:
 276                 return DP_TRAIN_PRE_EMPHASIS_6;
 277         case DP_TRAIN_VOLTAGE_SWING_600:
 278                 return DP_TRAIN_PRE_EMPHASIS_6;
 279         case DP_TRAIN_VOLTAGE_SWING_800:
 280                 return DP_TRAIN_PRE_EMPHASIS_3_5;
 281         case DP_TRAIN_VOLTAGE_SWING_1200:
 282         default:
 283                 return DP_TRAIN_PRE_EMPHASIS_0;
 284         }
 285 }
 286
 287 static void dp_get_adjust_train(u8 link_status[DP_LINK_STATUS_SIZE],
 288                                 int lane_count,
 289                                 u8 train_set[4])
 290 {
 291         u8 v = 0;
 292         u8 p = 0;
 293         int lane;
 294
 295         for (lane = 0; lane < lane_count; lane++) {
 296                 u8 this_v = dp_get_adjust_request_voltage(link_status, lane);
 297                 u8 this_p = dp_get_adjust_request_pre_emphasis(link_status, lane);
 298
 299                 DRM_DEBUG("requested signal parameters: lane %d voltage %s pre_emph %s\n",
 300                           lane,
 301                           voltage_names[this_v >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
 302                           pre_emph_names[this_p >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
 303
 304                 if (this_v > v)
 305                         v = this_v;
 306                 if (this_p > p)
 307                         p = this_p;
 308         }
 309
 310         if (v >= DP_VOLTAGE_MAX)
 311                 v = DP_VOLTAGE_MAX | DP_TRAIN_MAX_SWING_REACHED;
 312
 313         if (p >= dp_pre_emphasis_max(v))
 314                 p = dp_pre_emphasis_max(v) | DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
 315
 316         DRM_DEBUG("using signal parameters: voltage %s pre_emph %s\n",
 317                   voltage_names[(v & DP_TRAIN_VOLTAGE_SWING_MASK) >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
 318                   pre_emph_names[(p & DP_TRAIN_PRE_EMPHASIS_MASK) >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
 319
 320         for (lane = 0; lane < 4; lane++)
 321                 train_set[lane] = v | p;
 322 }
 323
 324
 325 /* radeon aux chan functions */
 326 bool radeon_process_aux_ch(struct radeon_i2c_chan *chan, u8 *req_bytes,
 327                            int num_bytes, u8 *read_byte,
 328                            u8 read_buf_len, u8 delay)
 329 {
 330         struct drm_device *dev = chan->dev;
 331         struct radeon_device *rdev = dev->dev_private;
 332         PROCESS_AUX_CHANNEL_TRANSACTION_PS_ALLOCATION args;
 333         int index = GetIndexIntoMasterTable(COMMAND, ProcessAuxChannelTransaction);
 334         unsigned char *base;
 335         int retry_count = 0;
 336
 337         memset(&args, 0, sizeof(args));
 338
 339         base = (unsigned char *)rdev->mode_info.atom_context->scratch;
 340
 341 retry:
 342         memcpy(base, req_bytes, num_bytes);
 343
 344         args.lpAuxRequest = 0;
 345         args.lpDataOut = 16;
 346         args.ucDataOutLen = 0;
 347         args.ucChannelID = chan->rec.i2c_id;
 348         args.ucDelay = delay / 10;
 349
 350         atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
 351
 352         if (args.ucReplyStatus && !args.ucDataOutLen) {
 353                 if (args.ucReplyStatus == 0x20 && retry_count++ < 10)
 354                         goto retry;
 355                 DRM_DEBUG("failed to get auxch %02x%02x %02x %02x 0x%02x %02x after %d retries\n",
 356                           req_bytes[1], req_bytes[0], req_bytes[2], req_bytes[3],
 357                           chan->rec.i2c_id, args.ucReplyStatus, retry_count);
 358                 return false;
 359         }
 360
 361         if (args.ucDataOutLen && read_byte && read_buf_len) {
 362                 if (read_buf_len < args.ucDataOutLen) {
 363                         DRM_ERROR("Buffer to small for return answer %d %d\n",
 364                                   read_buf_len, args.ucDataOutLen);
 365                         return false;
 366                 }
 367                 {
 368                         int len = min(read_buf_len, args.ucDataOutLen);
 369                         memcpy(read_byte, base + 16, len);
 370                 }
 371         }
 372         return true;
 373 }
 374
 375 bool radeon_dp_aux_native_write(struct radeon_connector *radeon_connector, uint16_t address,
 376                                 uint8_t send_bytes, uint8_t *send)
 377 {
 378         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 379         u8 msg[20];
 380         u8 msg_len, dp_msg_len;
 381         bool ret;
 382
 383         dp_msg_len = 4;
 384         msg[0] = address;
 385         msg[1] = address >> 8;
 386         msg[2] = AUX_NATIVE_WRITE << 4;
 387         dp_msg_len += send_bytes;
 388         msg[3] = (dp_msg_len << 4) | (send_bytes - 1);
 389
 390         if (send_bytes > 16)
 391                 return false;
 392
 393         memcpy(&msg[4], send, send_bytes);
 394         msg_len = 4 + send_bytes;
 395         ret = radeon_process_aux_ch(dig_connector->dp_i2c_bus, msg, msg_len, NULL, 0, 0);
 396         return ret;
 397 }
 398
 399 bool radeon_dp_aux_native_read(struct radeon_connector *radeon_connector, uint16_t address,
 400                                uint8_t delay, uint8_t expected_bytes,
 401                                uint8_t *read_p)
 402 {
 403         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 404         u8 msg[20];
 405         u8 msg_len, dp_msg_len;
 406         bool ret = false;
 407         msg_len = 4;
 408         dp_msg_len = 4;
 409         msg[0] = address;
 410         msg[1] = address >> 8;
 411         msg[2] = AUX_NATIVE_READ << 4;
 412         msg[3] = (dp_msg_len) << 4;
 413         msg[3] |= expected_bytes - 1;
 414
 415         ret = radeon_process_aux_ch(dig_connector->dp_i2c_bus, msg, msg_len, read_p, expected_bytes, delay);
 416         return ret;
 417 }
 418
 419 /* radeon dp functions */
 420 static u8 radeon_dp_encoder_service(struct radeon_device *rdev, int action, int dp_clock,
 421                                     uint8_t ucconfig, uint8_t lane_num)
 422 {
 423         DP_ENCODER_SERVICE_PARAMETERS args;
 424         int index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
 425
 426         memset(&args, 0, sizeof(args));
 427         args.ucLinkClock = dp_clock / 10;
 428         args.ucConfig = ucconfig;
 429         args.ucAction = action;
 430         args.ucLaneNum = lane_num;
 431         args.ucStatus = 0;
 432
 433         atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
 434         return args.ucStatus;
 435 }
 436
 437 u8 radeon_dp_getsinktype(struct radeon_connector *radeon_connector)
 438 {
 439         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 440         struct drm_device *dev = radeon_connector->base.dev;
 441         struct radeon_device *rdev = dev->dev_private;
 442
 443         return radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_GET_SINK_TYPE, 0,
 444                                          dig_connector->dp_i2c_bus->rec.i2c_id, 0);
 445 }
 446
 447 bool radeon_dp_getdpcd(struct radeon_connector *radeon_connector)
 448 {
 449         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 450         u8 msg[25];
 451         int ret;
 452
 453         ret = radeon_dp_aux_native_read(radeon_connector, DP_DPCD_REV, 0, 8, msg);
 454         if (ret) {
 455                 memcpy(dig_connector->dpcd, msg, 8);
 456                 {
 457                         int i;
 458                         DRM_DEBUG("DPCD: ");
 459                         for (i = 0; i < 8; i++)
 460                                 DRM_DEBUG("%02x ", msg[i]);
 461                         DRM_DEBUG("\n");
 462                 }
 463                 return true;
 464         }
 465         dig_connector->dpcd[0] = 0;
 466         return false;
 467 }
 468
 469 void radeon_dp_set_link_config(struct drm_connector *connector,
 470                                struct drm_display_mode *mode)
 471 {
 472         struct radeon_connector *radeon_connector;
 473         struct radeon_connector_atom_dig *dig_connector;
 474
 475         if ((connector->connector_type != DRM_MODE_CONNECTOR_DisplayPort) &&
 476             (connector->connector_type != DRM_MODE_CONNECTOR_eDP))
 477                 return;
 478
 479         radeon_connector = to_radeon_connector(connector);
 480         if (!radeon_connector->con_priv)
 481                 return;
 482         dig_connector = radeon_connector->con_priv;
 483
 484         dig_connector->dp_clock =
 485                 dp_link_clock_for_mode_clock(dig_connector->dpcd, mode->clock);
 486         dig_connector->dp_lane_count =
 487                 dp_lanes_for_mode_clock(dig_connector->dpcd, mode->clock);
 488 }
 489
 490 int radeon_dp_mode_valid_helper(struct radeon_connector *radeon_connector,
 491                                 struct drm_display_mode *mode)
 492 {
 493         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 494
 495         return dp_mode_valid(dig_connector->dpcd, mode->clock);
 496 }
 497
 498 static bool atom_dp_get_link_status(struct radeon_connector *radeon_connector,
 499                                     u8 link_status[DP_LINK_STATUS_SIZE])
 500 {
 501         int ret;
 502         ret = radeon_dp_aux_native_read(radeon_connector, DP_LANE0_1_STATUS, 100,
 503                                         DP_LINK_STATUS_SIZE, link_status);
 504         if (!ret) {
 505                 DRM_ERROR("displayport link status failed\n");
 506                 return false;
 507         }
 508
 509         DRM_DEBUG("link status %02x %02x %02x %02x %02x %02x\n",
 510                   link_status[0], link_status[1], link_status[2],
 511                   link_status[3], link_status[4], link_status[5]);
 512         return true;
 513 }
 514
 515 bool radeon_dp_needs_link_train(struct radeon_connector *radeon_connector)
 516 {
 517         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 518         u8 link_status[DP_LINK_STATUS_SIZE];
 519
 520         if (!atom_dp_get_link_status(radeon_connector, link_status))
 521                 return false;
 522         if (dp_channel_eq_ok(link_status, dig_connector->dp_lane_count))
 523                 return false;
 524         return true;
 525 }
 526
 527 static void dp_set_power(struct radeon_connector *radeon_connector, u8 power_state)
 528 {
 529         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 530
 531         if (dig_connector->dpcd[0] >= 0x11) {
 532                 radeon_dp_aux_native_write(radeon_connector, DP_SET_POWER, 1,
 533                                            &power_state);
 534         }
 535 }
 536
 537 static void dp_set_downspread(struct radeon_connector *radeon_connector, u8 downspread)
 538 {
 539         radeon_dp_aux_native_write(radeon_connector, DP_DOWNSPREAD_CTRL, 1,
 540                                    &downspread);
 541 }
 542
 543 static void dp_set_link_bw_lanes(struct radeon_connector *radeon_connector,
 544                                  u8 link_configuration[DP_LINK_CONFIGURATION_SIZE])
 545 {
 546         radeon_dp_aux_native_write(radeon_connector, DP_LINK_BW_SET, 2,
 547                                    link_configuration);
 548 }
 549
 550 static void dp_update_dpvs_emph(struct radeon_connector *radeon_connector,
 551                                 struct drm_encoder *encoder,
 552                                 u8 train_set[4])
 553 {
 554         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 555         int i;
 556
 557         for (i = 0; i < dig_connector->dp_lane_count; i++)
 558                 atombios_dig_transmitter_setup(encoder,
 559                                                ATOM_TRANSMITTER_ACTION_SETUP_VSEMPH,
 560                                                i, train_set[i]);
 561
 562         radeon_dp_aux_native_write(radeon_connector, DP_TRAINING_LANE0_SET,
 563                                    dig_connector->dp_lane_count, train_set);
 564 }
 565
 566 static void dp_set_training(struct radeon_connector *radeon_connector,
 567                             u8 training)
 568 {
 569         radeon_dp_aux_native_write(radeon_connector, DP_TRAINING_PATTERN_SET,
 570                                    1, &training);
 571 }
 572
 573 void dp_link_train(struct drm_encoder *encoder,
 574                    struct drm_connector *connector)
 575 {
 576         struct drm_device *dev = encoder->dev;
 577         struct radeon_device *rdev = dev->dev_private;
 578         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 579         struct radeon_encoder_atom_dig *dig;
 580         struct radeon_connector *radeon_connector;
 581         struct radeon_connector_atom_dig *dig_connector;
 582         int enc_id = 0;
 583         bool clock_recovery, channel_eq;
 584         u8 link_status[DP_LINK_STATUS_SIZE];
 585         u8 link_configuration[DP_LINK_CONFIGURATION_SIZE];
 586         u8 tries, voltage;
 587         u8 train_set[4];
 588         int i;
 589
 590         if ((connector->connector_type != DRM_MODE_CONNECTOR_DisplayPort) &&
 591             (connector->connector_type != DRM_MODE_CONNECTOR_eDP))
 592                 return;
 593
 594         if (!radeon_encoder->enc_priv)
 595                 return;
 596         dig = radeon_encoder->enc_priv;
 597
 598         radeon_connector = to_radeon_connector(connector);
 599         if (!radeon_connector->con_priv)
 600                 return;
 601         dig_connector = radeon_connector->con_priv;
 602
 603         if (dig->dig_encoder)
 604                 enc_id |= ATOM_DP_CONFIG_DIG2_ENCODER;
 605         else
 606                 enc_id |= ATOM_DP_CONFIG_DIG1_ENCODER;
 607         if (dig_connector->linkb)
 608                 enc_id |= ATOM_DP_CONFIG_LINK_B;
 609         else
 610                 enc_id |= ATOM_DP_CONFIG_LINK_A;
 611
 612         memset(link_configuration, 0, DP_LINK_CONFIGURATION_SIZE);
 613         if (dig_connector->dp_clock == 270000)
 614                 link_configuration[0] = DP_LINK_BW_2_7;
 615         else
 616                 link_configuration[0] = DP_LINK_BW_1_62;
 617         link_configuration[1] = dig_connector->dp_lane_count;
 618         if (dig_connector->dpcd[0] >= 0x11)
 619                 link_configuration[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
 620
 621         /* power up the sink */
 622         dp_set_power(radeon_connector, DP_SET_POWER_D0);
 623         /* disable the training pattern on the sink */
 624         dp_set_training(radeon_connector, DP_TRAINING_PATTERN_DISABLE);
 625         /* set link bw and lanes on the sink */
 626         dp_set_link_bw_lanes(radeon_connector, link_configuration);
 627         /* disable downspread on the sink */
 628         dp_set_downspread(radeon_connector, 0);
 629         /* start training on the source */
 630         radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_TRAINING_START,
 631                                   dig_connector->dp_clock, enc_id, 0);
 632         /* set training pattern 1 on the source */
 633         radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_TRAINING_PATTERN_SEL,
 634                                   dig_connector->dp_clock, enc_id, 0);
 635
 636         /* set initial vs/emph */
 637         memset(train_set, 0, 4);
 638         udelay(400);
 639         /* set training pattern 1 on the sink */
 640         dp_set_training(radeon_connector, DP_TRAINING_PATTERN_1);
 641
 642         dp_update_dpvs_emph(radeon_connector, encoder, train_set);
 643
 644         /* clock recovery loop */
 645         clock_recovery = false;
 646         tries = 0;
 647         voltage = 0xff;
 648         for (;;) {
 649                 udelay(100);
 650                 if (!atom_dp_get_link_status(radeon_connector, link_status))
 651                         break;
 652
 653                 if (dp_clock_recovery_ok(link_status, dig_connector->dp_lane_count)) {
 654                         clock_recovery = true;
 655                         break;
 656                 }
 657
 658                 for (i = 0; i < dig_connector->dp_lane_count; i++) {
 659                         if ((train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
 660                                 break;
 661                 }
 662                 if (i == dig_connector->dp_lane_count) {
 663                         DRM_ERROR("clock recovery reached max voltage\n");
 664                         break;
 665                 }
 666
 667                 if ((train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
 668                         ++tries;
 669                         if (tries == 5) {
 670                                 DRM_ERROR("clock recovery tried 5 times\n");
 671                                 break;
 672                         }
 673                 } else
 674                         tries = 0;
 675
 676                 voltage = train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
 677
 678                 /* Compute new train_set as requested by sink */
 679                 dp_get_adjust_train(link_status, dig_connector->dp_lane_count, train_set);
 680                 dp_update_dpvs_emph(radeon_connector, encoder, train_set);
 681         }
 682         if (!clock_recovery)
 683                 DRM_ERROR("clock recovery failed\n");
 684         else
 685                 DRM_DEBUG("clock recovery at voltage %d pre-emphasis %d\n",
 686                           train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
 687                           (train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) >>
 688                           DP_TRAIN_PRE_EMPHASIS_SHIFT);
 689
 690
 691         /* set training pattern 2 on the sink */
 692         dp_set_training(radeon_connector, DP_TRAINING_PATTERN_2);
 693         /* set training pattern 2 on the source */
 694         radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_TRAINING_PATTERN_SEL,
 695                                   dig_connector->dp_clock, enc_id, 1);
 696
 697         /* channel equalization loop */
 698         tries = 0;
 699         channel_eq = false;
 700         for (;;) {
 701                 udelay(400);
 702                 if (!atom_dp_get_link_status(radeon_connector, link_status))
 703                         break;
 704
 705                 if (dp_channel_eq_ok(link_status, dig_connector->dp_lane_count)) {
 706                         channel_eq = true;
 707                         break;
 708                 }
 709
 710                 /* Try 5 times */
 711                 if (tries > 5) {
 712                         DRM_ERROR("channel eq failed: 5 tries\n");
 713                         break;
 714                 }
 715
 716                 /* Compute new train_set as requested by sink */
 717                 dp_get_adjust_train(link_status, dig_connector->dp_lane_count, train_set);
 718                 dp_update_dpvs_emph(radeon_connector, encoder, train_set);
 719
 720                 tries++;
 721         }
 722
 723         if (!channel_eq)
 724                 DRM_ERROR("channel eq failed\n");
 725         else
 726                 DRM_DEBUG("channel eq at voltage %d pre-emphasis %d\n",
 727                           train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
 728                           (train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK)
 729                           >> DP_TRAIN_PRE_EMPHASIS_SHIFT);
 730
 731         /* disable the training pattern on the sink */
 732         dp_set_training(radeon_connector, DP_TRAINING_PATTERN_DISABLE);
 733
 734         radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_TRAINING_COMPLETE,
 735                                   dig_connector->dp_clock, enc_id, 0);
 736 }
 737
 738 int radeon_dp_i2c_aux_ch(struct i2c_adapter *adapter, int mode,
 739                          uint8_t write_byte, uint8_t *read_byte)
 740 {
 741         struct i2c_algo_dp_aux_data *algo_data = adapter->algo_data;
 742         struct radeon_i2c_chan *auxch = (struct radeon_i2c_chan *)adapter;
 743         int ret = 0;
 744         uint16_t address = algo_data->address;
 745         uint8_t msg[5];
 746         uint8_t reply[2];
 747         int msg_len, dp_msg_len;
 748         int reply_bytes;
 749
 750         /* Set up the command byte */
 751         if (mode & MODE_I2C_READ)
 752                 msg[2] = AUX_I2C_READ << 4;
 753         else
 754                 msg[2] = AUX_I2C_WRITE << 4;
 755
 756         if (!(mode & MODE_I2C_STOP))
 757                 msg[2] |= AUX_I2C_MOT << 4;
 758
 759         msg[0] = address;
 760         msg[1] = address >> 8;
 761
 762         reply_bytes = 1;
 763
 764         msg_len = 4;
 765         dp_msg_len = 3;
 766         switch (mode) {
 767         case MODE_I2C_WRITE:
 768                 msg[4] = write_byte;
 769                 msg_len++;
 770                 dp_msg_len += 2;
 771                 break;
 772         case MODE_I2C_READ:
 773                 dp_msg_len += 1;
 774                 break;
 775         default:
 776                 break;
 777         }
 778
 779         msg[3] = (dp_msg_len) << 4;
 780         ret = radeon_process_aux_ch(auxch, msg, msg_len, reply, reply_bytes, 0);
 781
 782         if (ret) {
 783                 if (read_byte)
 784                         *read_byte = reply[0];
 785                 return reply_bytes;
 786         }
 787         return -EREMOTEIO;
 788 }
 789