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 /***** radeon AUX functions *****/
  47 union aux_channel_transaction {
  48         PROCESS_AUX_CHANNEL_TRANSACTION_PS_ALLOCATION v1;
  49         PROCESS_AUX_CHANNEL_TRANSACTION_PARAMETERS_V2 v2;
  50 };
  51
  52 static int radeon_process_aux_ch(struct radeon_i2c_chan *chan,
  53                                  u8 *send, int send_bytes,
  54                                  u8 *recv, int recv_size,
  55                                  u8 delay, u8 *ack)
  56 {
  57         struct drm_device *dev = chan->dev;
  58         struct radeon_device *rdev = dev->dev_private;
  59         union aux_channel_transaction args;
  60         int index = GetIndexIntoMasterTable(COMMAND, ProcessAuxChannelTransaction);
  61         unsigned char *base;
  62         int recv_bytes;
  63
  64         memset(&args, 0, sizeof(args));
  65
  66         base = (unsigned char *)rdev->mode_info.atom_context->scratch;
  67
  68         memcpy(base, send, send_bytes);
  69
  70         args.v1.lpAuxRequest = 0;
  71         args.v1.lpDataOut = 16;
  72         args.v1.ucDataOutLen = 0;
  73         args.v1.ucChannelID = chan->rec.i2c_id;
  74         args.v1.ucDelay = delay / 10;
  75         if (ASIC_IS_DCE4(rdev))
  76                 args.v2.ucHPD_ID = chan->rec.hpd;
  77
  78         atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
  79
  80         *ack = args.v1.ucReplyStatus;
  81
  82         /* timeout */
  83         if (args.v1.ucReplyStatus == 1) {
  84                 DRM_DEBUG_KMS("dp_aux_ch timeout\n");
  85                 return -ETIMEDOUT;
  86         }
  87
  88         /* flags not zero */
  89         if (args.v1.ucReplyStatus == 2) {
  90                 DRM_DEBUG_KMS("dp_aux_ch flags not zero\n");
  91                 return -EBUSY;
  92         }
  93
  94         /* error */
  95         if (args.v1.ucReplyStatus == 3) {
  96                 DRM_DEBUG_KMS("dp_aux_ch error\n");
  97                 return -EIO;
  98         }
  99
 100         recv_bytes = args.v1.ucDataOutLen;
 101         if (recv_bytes > recv_size)
 102                 recv_bytes = recv_size;
 103
 104         if (recv && recv_size)
 105                 memcpy(recv, base + 16, recv_bytes);
 106
 107         return recv_bytes;
 108 }
 109
 110 static int radeon_dp_aux_native_write(struct radeon_connector *radeon_connector,
 111                                       u16 address, u8 *send, u8 send_bytes, u8 delay)
 112 {
 113         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 114         int ret;
 115         u8 msg[20];
 116         int msg_bytes = send_bytes + 4;
 117         u8 ack;
 118
 119         if (send_bytes > 16)
 120                 return -1;
 121
 122         msg[0] = address;
 123         msg[1] = address >> 8;
 124         msg[2] = AUX_NATIVE_WRITE << 4;
 125         msg[3] = (msg_bytes << 4) | (send_bytes - 1);
 126         memcpy(&msg[4], send, send_bytes);
 127
 128         while (1) {
 129                 ret = radeon_process_aux_ch(dig_connector->dp_i2c_bus,
 130                                             msg, msg_bytes, NULL, 0, delay, &ack);
 131                 if (ret < 0)
 132                         return ret;
 133                 if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_ACK)
 134                         break;
 135                 else if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_DEFER)
 136                         udelay(400);
 137                 else
 138                         return -EIO;
 139         }
 140
 141         return send_bytes;
 142 }
 143
 144 static int radeon_dp_aux_native_read(struct radeon_connector *radeon_connector,
 145                                      u16 address, u8 *recv, int recv_bytes, u8 delay)
 146 {
 147         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 148         u8 msg[4];
 149         int msg_bytes = 4;
 150         u8 ack;
 151         int ret;
 152
 153         msg[0] = address;
 154         msg[1] = address >> 8;
 155         msg[2] = AUX_NATIVE_READ << 4;
 156         msg[3] = (msg_bytes << 4) | (recv_bytes - 1);
 157
 158         while (1) {
 159                 ret = radeon_process_aux_ch(dig_connector->dp_i2c_bus,
 160                                             msg, msg_bytes, recv, recv_bytes, delay, &ack);
 161                 if (ret == 0)
 162                         return -EPROTO;
 163                 if (ret < 0)
 164                         return ret;
 165                 if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_ACK)
 166                         return ret;
 167                 else if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_DEFER)
 168                         udelay(400);
 169                 else
 170                         return -EIO;
 171         }
 172 }
 173
 174 static void radeon_write_dpcd_reg(struct radeon_connector *radeon_connector,
 175                                  u16 reg, u8 val)
 176 {
 177         radeon_dp_aux_native_write(radeon_connector, reg, &val, 1, 0);
 178 }
 179
 180 static u8 radeon_read_dpcd_reg(struct radeon_connector *radeon_connector,
 181                                u16 reg)
 182 {
 183         u8 val = 0;
 184
 185         radeon_dp_aux_native_read(radeon_connector, reg, &val, 1, 0);
 186
 187         return val;
 188 }
 189
 190 int radeon_dp_i2c_aux_ch(struct i2c_adapter *adapter, int mode,
 191                          u8 write_byte, u8 *read_byte)
 192 {
 193         struct i2c_algo_dp_aux_data *algo_data = adapter->algo_data;
 194         struct radeon_i2c_chan *auxch = (struct radeon_i2c_chan *)adapter;
 195         u16 address = algo_data->address;
 196         u8 msg[5];
 197         u8 reply[2];
 198         unsigned retry;
 199         int msg_bytes;
 200         int reply_bytes = 1;
 201         int ret;
 202         u8 ack;
 203
 204         /* Set up the command byte */
 205         if (mode & MODE_I2C_READ)
 206                 msg[2] = AUX_I2C_READ << 4;
 207         else
 208                 msg[2] = AUX_I2C_WRITE << 4;
 209
 210         if (!(mode & MODE_I2C_STOP))
 211                 msg[2] |= AUX_I2C_MOT << 4;
 212
 213         msg[0] = address;
 214         msg[1] = address >> 8;
 215
 216         switch (mode) {
 217         case MODE_I2C_WRITE:
 218                 msg_bytes = 5;
 219                 msg[3] = msg_bytes << 4;
 220                 msg[4] = write_byte;
 221                 break;
 222         case MODE_I2C_READ:
 223                 msg_bytes = 4;
 224                 msg[3] = msg_bytes << 4;
 225                 break;
 226         default:
 227                 msg_bytes = 4;
 228                 msg[3] = 3 << 4;
 229                 break;
 230         }
 231
 232         for (retry = 0; retry < 4; retry++) {
 233                 ret = radeon_process_aux_ch(auxch,
 234                                             msg, msg_bytes, reply, reply_bytes, 0, &ack);
 235                 if (ret < 0) {
 236                         DRM_DEBUG_KMS("aux_ch failed %d\n", ret);
 237                         return ret;
 238                 }
 239
 240                 switch (ack & AUX_NATIVE_REPLY_MASK) {
 241                 case AUX_NATIVE_REPLY_ACK:
 242                         /* I2C-over-AUX Reply field is only valid
 243                          * when paired with AUX ACK.
 244                          */
 245                         break;
 246                 case AUX_NATIVE_REPLY_NACK:
 247                         DRM_DEBUG_KMS("aux_ch native nack\n");
 248                         return -EREMOTEIO;
 249                 case AUX_NATIVE_REPLY_DEFER:
 250                         DRM_DEBUG_KMS("aux_ch native defer\n");
 251                         udelay(400);
 252                         continue;
 253                 default:
 254                         DRM_ERROR("aux_ch invalid native reply 0x%02x\n", ack);
 255                         return -EREMOTEIO;
 256                 }
 257
 258                 switch (ack & AUX_I2C_REPLY_MASK) {
 259                 case AUX_I2C_REPLY_ACK:
 260                         if (mode == MODE_I2C_READ)
 261                                 *read_byte = reply[0];
 262                         return ret;
 263                 case AUX_I2C_REPLY_NACK:
 264                         DRM_DEBUG_KMS("aux_i2c nack\n");
 265                         return -EREMOTEIO;
 266                 case AUX_I2C_REPLY_DEFER:
 267                         DRM_DEBUG_KMS("aux_i2c defer\n");
 268                         udelay(400);
 269                         break;
 270                 default:
 271                         DRM_ERROR("aux_i2c invalid reply 0x%02x\n", ack);
 272                         return -EREMOTEIO;
 273                 }
 274         }
 275
 276         DRM_ERROR("aux i2c too many retries, giving up\n");
 277         return -EREMOTEIO;
 278 }
 279
 280 /***** general DP utility functions *****/
 281
 282 static u8 dp_link_status(u8 link_status[DP_LINK_STATUS_SIZE], int r)
 283 {
 284         return link_status[r - DP_LANE0_1_STATUS];
 285 }
 286
 287 static u8 dp_get_lane_status(u8 link_status[DP_LINK_STATUS_SIZE],
 288                              int lane)
 289 {
 290         int i = DP_LANE0_1_STATUS + (lane >> 1);
 291         int s = (lane & 1) * 4;
 292         u8 l = dp_link_status(link_status, i);
 293         return (l >> s) & 0xf;
 294 }
 295
 296 static bool dp_clock_recovery_ok(u8 link_status[DP_LINK_STATUS_SIZE],
 297                                  int lane_count)
 298 {
 299         int lane;
 300         u8 lane_status;
 301
 302         for (lane = 0; lane < lane_count; lane++) {
 303                 lane_status = dp_get_lane_status(link_status, lane);
 304                 if ((lane_status & DP_LANE_CR_DONE) == 0)
 305                         return false;
 306         }
 307         return true;
 308 }
 309
 310 static bool dp_channel_eq_ok(u8 link_status[DP_LINK_STATUS_SIZE],
 311                              int lane_count)
 312 {
 313         u8 lane_align;
 314         u8 lane_status;
 315         int lane;
 316
 317         lane_align = dp_link_status(link_status,
 318                                     DP_LANE_ALIGN_STATUS_UPDATED);
 319         if ((lane_align & DP_INTERLANE_ALIGN_DONE) == 0)
 320                 return false;
 321         for (lane = 0; lane < lane_count; lane++) {
 322                 lane_status = dp_get_lane_status(link_status, lane);
 323                 if ((lane_status & DP_CHANNEL_EQ_BITS) != DP_CHANNEL_EQ_BITS)
 324                         return false;
 325         }
 326         return true;
 327 }
 328
 329 static u8 dp_get_adjust_request_voltage(u8 link_status[DP_LINK_STATUS_SIZE],
 330                                         int lane)
 331
 332 {
 333         int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1);
 334         int s = ((lane & 1) ?
 335                  DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT :
 336                  DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT);
 337         u8 l = dp_link_status(link_status, i);
 338
 339         return ((l >> s) & 0x3) << DP_TRAIN_VOLTAGE_SWING_SHIFT;
 340 }
 341
 342 static u8 dp_get_adjust_request_pre_emphasis(u8 link_status[DP_LINK_STATUS_SIZE],
 343                                              int lane)
 344 {
 345         int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1);
 346         int s = ((lane & 1) ?
 347                  DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT :
 348                  DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT);
 349         u8 l = dp_link_status(link_status, i);
 350
 351         return ((l >> s) & 0x3) << DP_TRAIN_PRE_EMPHASIS_SHIFT;
 352 }
 353
 354 #define DP_VOLTAGE_MAX         DP_TRAIN_VOLTAGE_SWING_1200
 355 #define DP_PRE_EMPHASIS_MAX    DP_TRAIN_PRE_EMPHASIS_9_5
 356
 357 static void dp_get_adjust_train(u8 link_status[DP_LINK_STATUS_SIZE],
 358                                 int lane_count,
 359                                 u8 train_set[4])
 360 {
 361         u8 v = 0;
 362         u8 p = 0;
 363         int lane;
 364
 365         for (lane = 0; lane < lane_count; lane++) {
 366                 u8 this_v = dp_get_adjust_request_voltage(link_status, lane);
 367                 u8 this_p = dp_get_adjust_request_pre_emphasis(link_status, lane);
 368
 369                 DRM_DEBUG_KMS("requested signal parameters: lane %d voltage %s pre_emph %s\n",
 370                           lane,
 371                           voltage_names[this_v >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
 372                           pre_emph_names[this_p >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
 373
 374                 if (this_v > v)
 375                         v = this_v;
 376                 if (this_p > p)
 377                         p = this_p;
 378         }
 379
 380         if (v >= DP_VOLTAGE_MAX)
 381                 v |= DP_TRAIN_MAX_SWING_REACHED;
 382
 383         if (p >= DP_PRE_EMPHASIS_MAX)
 384                 p |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
 385
 386         DRM_DEBUG_KMS("using signal parameters: voltage %s pre_emph %s\n",
 387                   voltage_names[(v & DP_TRAIN_VOLTAGE_SWING_MASK) >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
 388                   pre_emph_names[(p & DP_TRAIN_PRE_EMPHASIS_MASK) >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
 389
 390         for (lane = 0; lane < 4; lane++)
 391                 train_set[lane] = v | p;
 392 }
 393
 394 /* convert bits per color to bits per pixel */
 395 /* get bpc from the EDID */
 396 static int convert_bpc_to_bpp(int bpc)
 397 {
 398         if (bpc == 0)
 399                 return 24;
 400         else
 401                 return bpc * 3;
 402 }
 403
 404 /* get the max pix clock supported by the link rate and lane num */
 405 static int dp_get_max_dp_pix_clock(int link_rate,
 406                                    int lane_num,
 407                                    int bpp)
 408 {
 409         return (link_rate * lane_num * 8) / bpp;
 410 }
 411
 412 static int dp_get_max_link_rate(u8 dpcd[DP_DPCD_SIZE])
 413 {
 414         switch (dpcd[DP_MAX_LINK_RATE]) {
 415         case DP_LINK_BW_1_62:
 416         default:
 417                 return 162000;
 418         case DP_LINK_BW_2_7:
 419                 return 270000;
 420         case DP_LINK_BW_5_4:
 421                 return 540000;
 422         }
 423 }
 424
 425 static u8 dp_get_max_lane_number(u8 dpcd[DP_DPCD_SIZE])
 426 {
 427         return dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;
 428 }
 429
 430 static u8 dp_get_dp_link_rate_coded(int link_rate)
 431 {
 432         switch (link_rate) {
 433         case 162000:
 434         default:
 435                 return DP_LINK_BW_1_62;
 436         case 270000:
 437                 return DP_LINK_BW_2_7;
 438         case 540000:
 439                 return DP_LINK_BW_5_4;
 440         }
 441 }
 442
 443 /***** radeon specific DP functions *****/
 444
 445 /* First get the min lane# when low rate is used according to pixel clock
 446  * (prefer low rate), second check max lane# supported by DP panel,
 447  * if the max lane# < low rate lane# then use max lane# instead.
 448  */
 449 static int radeon_dp_get_dp_lane_number(struct drm_connector *connector,
 450                                         u8 dpcd[DP_DPCD_SIZE],
 451                                         int pix_clock)
 452 {
 453         int bpp = convert_bpc_to_bpp(connector->display_info.bpc);
 454         int max_link_rate = dp_get_max_link_rate(dpcd);
 455         int max_lane_num = dp_get_max_lane_number(dpcd);
 456         int lane_num;
 457         int max_dp_pix_clock;
 458
 459         for (lane_num = 1; lane_num < max_lane_num; lane_num <<= 1) {
 460                 max_dp_pix_clock = dp_get_max_dp_pix_clock(max_link_rate, lane_num, bpp);
 461                 if (pix_clock <= max_dp_pix_clock)
 462                         break;
 463         }
 464
 465         return lane_num;
 466 }
 467
 468 static int radeon_dp_get_dp_link_clock(struct drm_connector *connector,
 469                                        u8 dpcd[DP_DPCD_SIZE],
 470                                        int pix_clock)
 471 {
 472         int bpp = convert_bpc_to_bpp(connector->display_info.bpc);
 473         int lane_num, max_pix_clock;
 474
 475         if (radeon_connector_encoder_is_dp_bridge(connector))
 476                 return 270000;
 477
 478         lane_num = radeon_dp_get_dp_lane_number(connector, dpcd, pix_clock);
 479         max_pix_clock = dp_get_max_dp_pix_clock(162000, lane_num, bpp);
 480         if (pix_clock <= max_pix_clock)
 481                 return 162000;
 482         max_pix_clock = dp_get_max_dp_pix_clock(270000, lane_num, bpp);
 483         if (pix_clock <= max_pix_clock)
 484                 return 270000;
 485         if (radeon_connector_is_dp12_capable(connector)) {
 486                 max_pix_clock = dp_get_max_dp_pix_clock(540000, lane_num, bpp);
 487                 if (pix_clock <= max_pix_clock)
 488                         return 540000;
 489         }
 490
 491         return dp_get_max_link_rate(dpcd);
 492 }
 493
 494 static u8 radeon_dp_encoder_service(struct radeon_device *rdev,
 495                                     int action, int dp_clock,
 496                                     u8 ucconfig, u8 lane_num)
 497 {
 498         DP_ENCODER_SERVICE_PARAMETERS args;
 499         int index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
 500
 501         memset(&args, 0, sizeof(args));
 502         args.ucLinkClock = dp_clock / 10;
 503         args.ucConfig = ucconfig;
 504         args.ucAction = action;
 505         args.ucLaneNum = lane_num;
 506         args.ucStatus = 0;
 507
 508         atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
 509         return args.ucStatus;
 510 }
 511
 512 u8 radeon_dp_getsinktype(struct radeon_connector *radeon_connector)
 513 {
 514         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 515         struct drm_device *dev = radeon_connector->base.dev;
 516         struct radeon_device *rdev = dev->dev_private;
 517
 518         return radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_GET_SINK_TYPE, 0,
 519                                          dig_connector->dp_i2c_bus->rec.i2c_id, 0);
 520 }
 521
 522 bool radeon_dp_getdpcd(struct radeon_connector *radeon_connector)
 523 {
 524         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 525         u8 msg[25];
 526         int ret, i;
 527
 528         ret = radeon_dp_aux_native_read(radeon_connector, DP_DPCD_REV, msg, 8, 0);
 529         if (ret > 0) {
 530                 memcpy(dig_connector->dpcd, msg, 8);
 531                 DRM_DEBUG_KMS("DPCD: ");
 532                 for (i = 0; i < 8; i++)
 533                         DRM_DEBUG_KMS("%02x ", msg[i]);
 534                 DRM_DEBUG_KMS("\n");
 535                 return true;
 536         }
 537         dig_connector->dpcd[0] = 0;
 538         return false;
 539 }
 540
 541 static void radeon_dp_set_panel_mode(struct drm_encoder *encoder,
 542                                      struct drm_connector *connector)
 543 {
 544         struct drm_device *dev = encoder->dev;
 545         struct radeon_device *rdev = dev->dev_private;
 546         int panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
 547
 548         if (!ASIC_IS_DCE4(rdev))
 549                 return;
 550
 551         if (radeon_connector_encoder_is_dp_bridge(connector))
 552                 panel_mode = DP_PANEL_MODE_INTERNAL_DP1_MODE;
 553
 554         atombios_dig_encoder_setup(encoder,
 555                                    ATOM_ENCODER_CMD_SETUP_PANEL_MODE,
 556                                    panel_mode);
 557 }
 558
 559 void radeon_dp_set_link_config(struct drm_connector *connector,
 560                                struct drm_display_mode *mode)
 561 {
 562         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 563         struct radeon_connector_atom_dig *dig_connector;
 564
 565         if (!radeon_connector->con_priv)
 566                 return;
 567         dig_connector = radeon_connector->con_priv;
 568
 569         if ((dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) ||
 570             (dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_eDP)) {
 571                 dig_connector->dp_clock =
 572                         radeon_dp_get_dp_link_clock(connector, dig_connector->dpcd, mode->clock);
 573                 dig_connector->dp_lane_count =
 574                         radeon_dp_get_dp_lane_number(connector, dig_connector->dpcd, mode->clock);
 575         }
 576 }
 577
 578 int radeon_dp_mode_valid_helper(struct drm_connector *connector,
 579                                 struct drm_display_mode *mode)
 580 {
 581         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 582         struct radeon_connector_atom_dig *dig_connector;
 583         int dp_clock;
 584
 585         if (!radeon_connector->con_priv)
 586                 return MODE_CLOCK_HIGH;
 587         dig_connector = radeon_connector->con_priv;
 588
 589         dp_clock =
 590                 radeon_dp_get_dp_link_clock(connector, dig_connector->dpcd, mode->clock);
 591
 592         if ((dp_clock == 540000) &&
 593             (!radeon_connector_is_dp12_capable(connector)))
 594                 return MODE_CLOCK_HIGH;
 595
 596         return MODE_OK;
 597 }
 598
 599 static bool radeon_dp_get_link_status(struct radeon_connector *radeon_connector,
 600                                       u8 link_status[DP_LINK_STATUS_SIZE])
 601 {
 602         int ret;
 603         ret = radeon_dp_aux_native_read(radeon_connector, DP_LANE0_1_STATUS,
 604                                         link_status, DP_LINK_STATUS_SIZE, 100);
 605         if (ret <= 0) {
 606                 DRM_ERROR("displayport link status failed\n");
 607                 return false;
 608         }
 609
 610         DRM_DEBUG_KMS("link status %02x %02x %02x %02x %02x %02x\n",
 611                   link_status[0], link_status[1], link_status[2],
 612                   link_status[3], link_status[4], link_status[5]);
 613         return true;
 614 }
 615
 616 bool radeon_dp_needs_link_train(struct radeon_connector *radeon_connector)
 617 {
 618         u8 link_status[DP_LINK_STATUS_SIZE];
 619         struct radeon_connector_atom_dig *dig = radeon_connector->con_priv;
 620
 621         if (!radeon_dp_get_link_status(radeon_connector, link_status))
 622                 return false;
 623         if (dp_channel_eq_ok(link_status, dig->dp_lane_count))
 624                 return false;
 625         return true;
 626 }
 627
 628 struct radeon_dp_link_train_info {
 629         struct radeon_device *rdev;
 630         struct drm_encoder *encoder;
 631         struct drm_connector *connector;
 632         struct radeon_connector *radeon_connector;
 633         int enc_id;
 634         int dp_clock;
 635         int dp_lane_count;
 636         int rd_interval;
 637         bool tp3_supported;
 638         u8 dpcd[8];
 639         u8 train_set[4];
 640         u8 link_status[DP_LINK_STATUS_SIZE];
 641         u8 tries;
 642         bool use_dpencoder;
 643 };
 644
 645 static void radeon_dp_update_vs_emph(struct radeon_dp_link_train_info *dp_info)
 646 {
 647         /* set the initial vs/emph on the source */
 648         atombios_dig_transmitter_setup(dp_info->encoder,
 649                                        ATOM_TRANSMITTER_ACTION_SETUP_VSEMPH,
 650                                        0, dp_info->train_set[0]); /* sets all lanes at once */
 651
 652         /* set the vs/emph on the sink */
 653         radeon_dp_aux_native_write(dp_info->radeon_connector, DP_TRAINING_LANE0_SET,
 654                                    dp_info->train_set, dp_info->dp_lane_count, 0);
 655 }
 656
 657 static void radeon_dp_set_tp(struct radeon_dp_link_train_info *dp_info, int tp)
 658 {
 659         int rtp = 0;
 660
 661         /* set training pattern on the source */
 662         if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder) {
 663                 switch (tp) {
 664                 case DP_TRAINING_PATTERN_1:
 665                         rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN1;
 666                         break;
 667                 case DP_TRAINING_PATTERN_2:
 668                         rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN2;
 669                         break;
 670                 case DP_TRAINING_PATTERN_3:
 671                         rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN3;
 672                         break;
 673                 }
 674                 atombios_dig_encoder_setup(dp_info->encoder, rtp, 0);
 675         } else {
 676                 switch (tp) {
 677                 case DP_TRAINING_PATTERN_1:
 678                         rtp = 0;
 679                         break;
 680                 case DP_TRAINING_PATTERN_2:
 681                         rtp = 1;
 682                         break;
 683                 }
 684                 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_PATTERN_SEL,
 685                                           dp_info->dp_clock, dp_info->enc_id, rtp);
 686         }
 687
 688         /* enable training pattern on the sink */
 689         radeon_write_dpcd_reg(dp_info->radeon_connector, DP_TRAINING_PATTERN_SET, tp);
 690 }
 691
 692 static int radeon_dp_link_train_init(struct radeon_dp_link_train_info *dp_info)
 693 {
 694         u8 tmp;
 695
 696         /* power up the sink */
 697         if (dp_info->dpcd[0] >= 0x11)
 698                 radeon_write_dpcd_reg(dp_info->radeon_connector,
 699                                       DP_SET_POWER, DP_SET_POWER_D0);
 700
 701         /* possibly enable downspread on the sink */
 702         if (dp_info->dpcd[3] & 0x1)
 703                 radeon_write_dpcd_reg(dp_info->radeon_connector,
 704                                       DP_DOWNSPREAD_CTRL, DP_SPREAD_AMP_0_5);
 705         else
 706                 radeon_write_dpcd_reg(dp_info->radeon_connector,
 707                                       DP_DOWNSPREAD_CTRL, 0);
 708
 709         radeon_dp_set_panel_mode(dp_info->encoder, dp_info->connector);
 710
 711         /* set the lane count on the sink */
 712         tmp = dp_info->dp_lane_count;
 713         if (dp_info->dpcd[0] >= 0x11)
 714                 tmp |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
 715         radeon_write_dpcd_reg(dp_info->radeon_connector, DP_LANE_COUNT_SET, tmp);
 716
 717         /* set the link rate on the sink */
 718         tmp = dp_get_dp_link_rate_coded(dp_info->dp_clock);
 719         radeon_write_dpcd_reg(dp_info->radeon_connector, DP_LINK_BW_SET, tmp);
 720
 721         /* start training on the source */
 722         if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder)
 723                 atombios_dig_encoder_setup(dp_info->encoder,
 724                                            ATOM_ENCODER_CMD_DP_LINK_TRAINING_START, 0);
 725         else
 726                 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_START,
 727                                           dp_info->dp_clock, dp_info->enc_id, 0);
 728
 729         /* disable the training pattern on the sink */
 730         radeon_write_dpcd_reg(dp_info->radeon_connector,
 731                               DP_TRAINING_PATTERN_SET,
 732                               DP_TRAINING_PATTERN_DISABLE);
 733
 734         return 0;
 735 }
 736
 737 static int radeon_dp_link_train_finish(struct radeon_dp_link_train_info *dp_info)
 738 {
 739         udelay(400);
 740
 741         /* disable the training pattern on the sink */
 742         radeon_write_dpcd_reg(dp_info->radeon_connector,
 743                               DP_TRAINING_PATTERN_SET,
 744                               DP_TRAINING_PATTERN_DISABLE);
 745
 746         /* disable the training pattern on the source */
 747         if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder)
 748                 atombios_dig_encoder_setup(dp_info->encoder,
 749                                            ATOM_ENCODER_CMD_DP_LINK_TRAINING_COMPLETE, 0);
 750         else
 751                 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_COMPLETE,
 752                                           dp_info->dp_clock, dp_info->enc_id, 0);
 753
 754         return 0;
 755 }
 756
 757 static int radeon_dp_link_train_cr(struct radeon_dp_link_train_info *dp_info)
 758 {
 759         bool clock_recovery;
 760         u8 voltage;
 761         int i;
 762
 763         radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_1);
 764         memset(dp_info->train_set, 0, 4);
 765         radeon_dp_update_vs_emph(dp_info);
 766
 767         udelay(400);
 768
 769         /* clock recovery loop */
 770         clock_recovery = false;
 771         dp_info->tries = 0;
 772         voltage = 0xff;
 773         while (1) {
 774                 if (dp_info->rd_interval == 0)
 775                         udelay(100);
 776                 else
 777                         mdelay(dp_info->rd_interval * 4);
 778
 779                 if (!radeon_dp_get_link_status(dp_info->radeon_connector, dp_info->link_status))
 780                         break;
 781
 782                 if (dp_clock_recovery_ok(dp_info->link_status, dp_info->dp_lane_count)) {
 783                         clock_recovery = true;
 784                         break;
 785                 }
 786
 787                 for (i = 0; i < dp_info->dp_lane_count; i++) {
 788                         if ((dp_info->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
 789                                 break;
 790                 }
 791                 if (i == dp_info->dp_lane_count) {
 792                         DRM_ERROR("clock recovery reached max voltage\n");
 793                         break;
 794                 }
 795
 796                 if ((dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
 797                         ++dp_info->tries;
 798                         if (dp_info->tries == 5) {
 799                                 DRM_ERROR("clock recovery tried 5 times\n");
 800                                 break;
 801                         }
 802                 } else
 803                         dp_info->tries = 0;
 804
 805                 voltage = dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
 806
 807                 /* Compute new train_set as requested by sink */
 808                 dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, dp_info->train_set);
 809
 810                 radeon_dp_update_vs_emph(dp_info);
 811         }
 812         if (!clock_recovery) {
 813                 DRM_ERROR("clock recovery failed\n");
 814                 return -1;
 815         } else {
 816                 DRM_DEBUG_KMS("clock recovery at voltage %d pre-emphasis %d\n",
 817                           dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
 818                           (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) >>
 819                           DP_TRAIN_PRE_EMPHASIS_SHIFT);
 820                 return 0;
 821         }
 822 }
 823
 824 static int radeon_dp_link_train_ce(struct radeon_dp_link_train_info *dp_info)
 825 {
 826         bool channel_eq;
 827
 828         if (dp_info->tp3_supported)
 829                 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_3);
 830         else
 831                 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_2);
 832
 833         /* channel equalization loop */
 834         dp_info->tries = 0;
 835         channel_eq = false;
 836         while (1) {
 837                 if (dp_info->rd_interval == 0)
 838                         udelay(400);
 839                 else
 840                         mdelay(dp_info->rd_interval * 4);
 841
 842                 if (!radeon_dp_get_link_status(dp_info->radeon_connector, dp_info->link_status))
 843                         break;
 844
 845                 if (dp_channel_eq_ok(dp_info->link_status, dp_info->dp_lane_count)) {
 846                         channel_eq = true;
 847                         break;
 848                 }
 849
 850                 /* Try 5 times */
 851                 if (dp_info->tries > 5) {
 852                         DRM_ERROR("channel eq failed: 5 tries\n");
 853                         break;
 854                 }
 855
 856                 /* Compute new train_set as requested by sink */
 857                 dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, dp_info->train_set);
 858
 859                 radeon_dp_update_vs_emph(dp_info);
 860                 dp_info->tries++;
 861         }
 862
 863         if (!channel_eq) {
 864                 DRM_ERROR("channel eq failed\n");
 865                 return -1;
 866         } else {
 867                 DRM_DEBUG_KMS("channel eq at voltage %d pre-emphasis %d\n",
 868                           dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
 869                           (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK)
 870                           >> DP_TRAIN_PRE_EMPHASIS_SHIFT);
 871                 return 0;
 872         }
 873 }
 874
 875 void radeon_dp_link_train(struct drm_encoder *encoder,
 876                           struct drm_connector *connector)
 877 {
 878         struct drm_device *dev = encoder->dev;
 879         struct radeon_device *rdev = dev->dev_private;
 880         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 881         struct radeon_encoder_atom_dig *dig;
 882         struct radeon_connector *radeon_connector;
 883         struct radeon_connector_atom_dig *dig_connector;
 884         struct radeon_dp_link_train_info dp_info;
 885         int index;
 886         u8 tmp, frev, crev;
 887
 888         if (!radeon_encoder->enc_priv)
 889                 return;
 890         dig = radeon_encoder->enc_priv;
 891
 892         radeon_connector = to_radeon_connector(connector);
 893         if (!radeon_connector->con_priv)
 894                 return;
 895         dig_connector = radeon_connector->con_priv;
 896
 897         if ((dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_DISPLAYPORT) &&
 898             (dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_eDP))
 899                 return;
 900
 901         /* DPEncoderService newer than 1.1 can't program properly the
 902          * training pattern. When facing such version use the
 903          * DIGXEncoderControl (X== 1 | 2)
 904          */
 905         dp_info.use_dpencoder = true;
 906         index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
 907         if (atom_parse_cmd_header(rdev->mode_info.atom_context, index, &frev, &crev)) {
 908                 if (crev > 1) {
 909                         dp_info.use_dpencoder = false;
 910                 }
 911         }
 912
 913         dp_info.enc_id = 0;
 914         if (dig->dig_encoder)
 915                 dp_info.enc_id |= ATOM_DP_CONFIG_DIG2_ENCODER;
 916         else
 917                 dp_info.enc_id |= ATOM_DP_CONFIG_DIG1_ENCODER;
 918         if (dig->linkb)
 919                 dp_info.enc_id |= ATOM_DP_CONFIG_LINK_B;
 920         else
 921                 dp_info.enc_id |= ATOM_DP_CONFIG_LINK_A;
 922
 923         dp_info.rd_interval = radeon_read_dpcd_reg(radeon_connector, DP_TRAINING_AUX_RD_INTERVAL);
 924         tmp = radeon_read_dpcd_reg(radeon_connector, DP_MAX_LANE_COUNT);
 925         if (ASIC_IS_DCE5(rdev) && (tmp & DP_TPS3_SUPPORTED))
 926                 dp_info.tp3_supported = true;
 927         else
 928                 dp_info.tp3_supported = false;
 929
 930         memcpy(dp_info.dpcd, dig_connector->dpcd, 8);
 931         dp_info.rdev = rdev;
 932         dp_info.encoder = encoder;
 933         dp_info.connector = connector;
 934         dp_info.radeon_connector = radeon_connector;
 935         dp_info.dp_lane_count = dig_connector->dp_lane_count;
 936         dp_info.dp_clock = dig_connector->dp_clock;
 937
 938         if (radeon_dp_link_train_init(&dp_info))
 939                 goto done;
 940         if (radeon_dp_link_train_cr(&dp_info))
 941                 goto done;
 942         if (radeon_dp_link_train_ce(&dp_info))
 943                 goto done;
 944 done:
 945         if (radeon_dp_link_train_finish(&dp_info))
 946                 return;
 947 }