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         unsigned retry;
 119
 120         if (send_bytes > 16)
 121                 return -1;
 122
 123         msg[0] = address;
 124         msg[1] = address >> 8;
 125         msg[2] = AUX_NATIVE_WRITE << 4;
 126         msg[3] = (msg_bytes << 4) | (send_bytes - 1);
 127         memcpy(&msg[4], send, send_bytes);
 128
 129         for (retry = 0; retry < 4; retry++) {
 130                 ret = radeon_process_aux_ch(dig_connector->dp_i2c_bus,
 131                                             msg, msg_bytes, NULL, 0, delay, &ack);
 132                 if (ret == -EBUSY)
 133                         continue;
 134                 else if (ret < 0)
 135                         return ret;
 136                 if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_ACK)
 137                         return send_bytes;
 138                 else if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_DEFER)
 139                         udelay(400);
 140                 else
 141                         return -EIO;
 142         }
 143
 144         return -EIO;
 145 }
 146
 147 static int radeon_dp_aux_native_read(struct radeon_connector *radeon_connector,
 148                                      u16 address, u8 *recv, int recv_bytes, u8 delay)
 149 {
 150         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 151         u8 msg[4];
 152         int msg_bytes = 4;
 153         u8 ack;
 154         int ret;
 155         unsigned retry;
 156
 157         msg[0] = address;
 158         msg[1] = address >> 8;
 159         msg[2] = AUX_NATIVE_READ << 4;
 160         msg[3] = (msg_bytes << 4) | (recv_bytes - 1);
 161
 162         for (retry = 0; retry < 4; retry++) {
 163                 ret = radeon_process_aux_ch(dig_connector->dp_i2c_bus,
 164                                             msg, msg_bytes, recv, recv_bytes, delay, &ack);
 165                 if (ret == -EBUSY)
 166                         continue;
 167                 else if (ret < 0)
 168                         return ret;
 169                 if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_ACK)
 170                         return ret;
 171                 else if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_DEFER)
 172                         udelay(400);
 173                 else if (ret == 0)
 174                         return -EPROTO;
 175                 else
 176                         return -EIO;
 177         }
 178
 179         return -EIO;
 180 }
 181
 182 static void radeon_write_dpcd_reg(struct radeon_connector *radeon_connector,
 183                                  u16 reg, u8 val)
 184 {
 185         radeon_dp_aux_native_write(radeon_connector, reg, &val, 1, 0);
 186 }
 187
 188 static u8 radeon_read_dpcd_reg(struct radeon_connector *radeon_connector,
 189                                u16 reg)
 190 {
 191         u8 val = 0;
 192
 193         radeon_dp_aux_native_read(radeon_connector, reg, &val, 1, 0);
 194
 195         return val;
 196 }
 197
 198 int radeon_dp_i2c_aux_ch(struct i2c_adapter *adapter, int mode,
 199                          u8 write_byte, u8 *read_byte)
 200 {
 201         struct i2c_algo_dp_aux_data *algo_data = adapter->algo_data;
 202         struct radeon_i2c_chan *auxch = (struct radeon_i2c_chan *)adapter;
 203         u16 address = algo_data->address;
 204         u8 msg[5];
 205         u8 reply[2];
 206         unsigned retry;
 207         int msg_bytes;
 208         int reply_bytes = 1;
 209         int ret;
 210         u8 ack;
 211
 212         /* Set up the command byte */
 213         if (mode & MODE_I2C_READ)
 214                 msg[2] = AUX_I2C_READ << 4;
 215         else
 216                 msg[2] = AUX_I2C_WRITE << 4;
 217
 218         if (!(mode & MODE_I2C_STOP))
 219                 msg[2] |= AUX_I2C_MOT << 4;
 220
 221         msg[0] = address;
 222         msg[1] = address >> 8;
 223
 224         switch (mode) {
 225         case MODE_I2C_WRITE:
 226                 msg_bytes = 5;
 227                 msg[3] = msg_bytes << 4;
 228                 msg[4] = write_byte;
 229                 break;
 230         case MODE_I2C_READ:
 231                 msg_bytes = 4;
 232                 msg[3] = msg_bytes << 4;
 233                 break;
 234         default:
 235                 msg_bytes = 4;
 236                 msg[3] = 3 << 4;
 237                 break;
 238         }
 239
 240         for (retry = 0; retry < 4; retry++) {
 241                 ret = radeon_process_aux_ch(auxch,
 242                                             msg, msg_bytes, reply, reply_bytes, 0, &ack);
 243                 if (ret == -EBUSY)
 244                         continue;
 245                 else if (ret < 0) {
 246                         DRM_DEBUG_KMS("aux_ch failed %d\n", ret);
 247                         return ret;
 248                 }
 249
 250                 switch (ack & AUX_NATIVE_REPLY_MASK) {
 251                 case AUX_NATIVE_REPLY_ACK:
 252                         /* I2C-over-AUX Reply field is only valid
 253                          * when paired with AUX ACK.
 254                          */
 255                         break;
 256                 case AUX_NATIVE_REPLY_NACK:
 257                         DRM_DEBUG_KMS("aux_ch native nack\n");
 258                         return -EREMOTEIO;
 259                 case AUX_NATIVE_REPLY_DEFER:
 260                         DRM_DEBUG_KMS("aux_ch native defer\n");
 261                         udelay(400);
 262                         continue;
 263                 default:
 264                         DRM_ERROR("aux_ch invalid native reply 0x%02x\n", ack);
 265                         return -EREMOTEIO;
 266                 }
 267
 268                 switch (ack & AUX_I2C_REPLY_MASK) {
 269                 case AUX_I2C_REPLY_ACK:
 270                         if (mode == MODE_I2C_READ)
 271                                 *read_byte = reply[0];
 272                         return ret;
 273                 case AUX_I2C_REPLY_NACK:
 274                         DRM_DEBUG_KMS("aux_i2c nack\n");
 275                         return -EREMOTEIO;
 276                 case AUX_I2C_REPLY_DEFER:
 277                         DRM_DEBUG_KMS("aux_i2c defer\n");
 278                         udelay(400);
 279                         break;
 280                 default:
 281                         DRM_ERROR("aux_i2c invalid reply 0x%02x\n", ack);
 282                         return -EREMOTEIO;
 283                 }
 284         }
 285
 286         DRM_DEBUG_KMS("aux i2c too many retries, giving up\n");
 287         return -EREMOTEIO;
 288 }
 289
 290 /***** general DP utility functions *****/
 291
 292 static u8 dp_link_status(u8 link_status[DP_LINK_STATUS_SIZE], int r)
 293 {
 294         return link_status[r - DP_LANE0_1_STATUS];
 295 }
 296
 297 static u8 dp_get_lane_status(u8 link_status[DP_LINK_STATUS_SIZE],
 298                              int lane)
 299 {
 300         int i = DP_LANE0_1_STATUS + (lane >> 1);
 301         int s = (lane & 1) * 4;
 302         u8 l = dp_link_status(link_status, i);
 303         return (l >> s) & 0xf;
 304 }
 305
 306 static bool dp_clock_recovery_ok(u8 link_status[DP_LINK_STATUS_SIZE],
 307                                  int lane_count)
 308 {
 309         int lane;
 310         u8 lane_status;
 311
 312         for (lane = 0; lane < lane_count; lane++) {
 313                 lane_status = dp_get_lane_status(link_status, lane);
 314                 if ((lane_status & DP_LANE_CR_DONE) == 0)
 315                         return false;
 316         }
 317         return true;
 318 }
 319
 320 static bool dp_channel_eq_ok(u8 link_status[DP_LINK_STATUS_SIZE],
 321                              int lane_count)
 322 {
 323         u8 lane_align;
 324         u8 lane_status;
 325         int lane;
 326
 327         lane_align = dp_link_status(link_status,
 328                                     DP_LANE_ALIGN_STATUS_UPDATED);
 329         if ((lane_align & DP_INTERLANE_ALIGN_DONE) == 0)
 330                 return false;
 331         for (lane = 0; lane < lane_count; lane++) {
 332                 lane_status = dp_get_lane_status(link_status, lane);
 333                 if ((lane_status & DP_CHANNEL_EQ_BITS) != DP_CHANNEL_EQ_BITS)
 334                         return false;
 335         }
 336         return true;
 337 }
 338
 339 static u8 dp_get_adjust_request_voltage(u8 link_status[DP_LINK_STATUS_SIZE],
 340                                         int lane)
 341
 342 {
 343         int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1);
 344         int s = ((lane & 1) ?
 345                  DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT :
 346                  DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT);
 347         u8 l = dp_link_status(link_status, i);
 348
 349         return ((l >> s) & 0x3) << DP_TRAIN_VOLTAGE_SWING_SHIFT;
 350 }
 351
 352 static u8 dp_get_adjust_request_pre_emphasis(u8 link_status[DP_LINK_STATUS_SIZE],
 353                                              int lane)
 354 {
 355         int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1);
 356         int s = ((lane & 1) ?
 357                  DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT :
 358                  DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT);
 359         u8 l = dp_link_status(link_status, i);
 360
 361         return ((l >> s) & 0x3) << DP_TRAIN_PRE_EMPHASIS_SHIFT;
 362 }
 363
 364 #define DP_VOLTAGE_MAX         DP_TRAIN_VOLTAGE_SWING_1200
 365 #define DP_PRE_EMPHASIS_MAX    DP_TRAIN_PRE_EMPHASIS_9_5
 366
 367 static void dp_get_adjust_train(u8 link_status[DP_LINK_STATUS_SIZE],
 368                                 int lane_count,
 369                                 u8 train_set[4])
 370 {
 371         u8 v = 0;
 372         u8 p = 0;
 373         int lane;
 374
 375         for (lane = 0; lane < lane_count; lane++) {
 376                 u8 this_v = dp_get_adjust_request_voltage(link_status, lane);
 377                 u8 this_p = dp_get_adjust_request_pre_emphasis(link_status, lane);
 378
 379                 DRM_DEBUG_KMS("requested signal parameters: lane %d voltage %s pre_emph %s\n",
 380                           lane,
 381                           voltage_names[this_v >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
 382                           pre_emph_names[this_p >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
 383
 384                 if (this_v > v)
 385                         v = this_v;
 386                 if (this_p > p)
 387                         p = this_p;
 388         }
 389
 390         if (v >= DP_VOLTAGE_MAX)
 391                 v |= DP_TRAIN_MAX_SWING_REACHED;
 392
 393         if (p >= DP_PRE_EMPHASIS_MAX)
 394                 p |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
 395
 396         DRM_DEBUG_KMS("using signal parameters: voltage %s pre_emph %s\n",
 397                   voltage_names[(v & DP_TRAIN_VOLTAGE_SWING_MASK) >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
 398                   pre_emph_names[(p & DP_TRAIN_PRE_EMPHASIS_MASK) >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
 399
 400         for (lane = 0; lane < 4; lane++)
 401                 train_set[lane] = v | p;
 402 }
 403
 404 /* convert bits per color to bits per pixel */
 405 /* get bpc from the EDID */
 406 static int convert_bpc_to_bpp(int bpc)
 407 {
 408         if (bpc == 0)
 409                 return 24;
 410         else
 411                 return bpc * 3;
 412 }
 413
 414 /* get the max pix clock supported by the link rate and lane num */
 415 static int dp_get_max_dp_pix_clock(int link_rate,
 416                                    int lane_num,
 417                                    int bpp)
 418 {
 419         return (link_rate * lane_num * 8) / bpp;
 420 }
 421
 422 static int dp_get_max_link_rate(u8 dpcd[DP_DPCD_SIZE])
 423 {
 424         switch (dpcd[DP_MAX_LINK_RATE]) {
 425         case DP_LINK_BW_1_62:
 426         default:
 427                 return 162000;
 428         case DP_LINK_BW_2_7:
 429                 return 270000;
 430         case DP_LINK_BW_5_4:
 431                 return 540000;
 432         }
 433 }
 434
 435 static u8 dp_get_max_lane_number(u8 dpcd[DP_DPCD_SIZE])
 436 {
 437         return dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;
 438 }
 439
 440 static u8 dp_get_dp_link_rate_coded(int link_rate)
 441 {
 442         switch (link_rate) {
 443         case 162000:
 444         default:
 445                 return DP_LINK_BW_1_62;
 446         case 270000:
 447                 return DP_LINK_BW_2_7;
 448         case 540000:
 449                 return DP_LINK_BW_5_4;
 450         }
 451 }
 452
 453 /***** radeon specific DP functions *****/
 454
 455 /* First get the min lane# when low rate is used according to pixel clock
 456  * (prefer low rate), second check max lane# supported by DP panel,
 457  * if the max lane# < low rate lane# then use max lane# instead.
 458  */
 459 static int radeon_dp_get_dp_lane_number(struct drm_connector *connector,
 460                                         u8 dpcd[DP_DPCD_SIZE],
 461                                         int pix_clock)
 462 {
 463         int bpp = convert_bpc_to_bpp(connector->display_info.bpc);
 464         int max_link_rate = dp_get_max_link_rate(dpcd);
 465         int max_lane_num = dp_get_max_lane_number(dpcd);
 466         int lane_num;
 467         int max_dp_pix_clock;
 468
 469         for (lane_num = 1; lane_num < max_lane_num; lane_num <<= 1) {
 470                 max_dp_pix_clock = dp_get_max_dp_pix_clock(max_link_rate, lane_num, bpp);
 471                 if (pix_clock <= max_dp_pix_clock)
 472                         break;
 473         }
 474
 475         return lane_num;
 476 }
 477
 478 static int radeon_dp_get_dp_link_clock(struct drm_connector *connector,
 479                                        u8 dpcd[DP_DPCD_SIZE],
 480                                        int pix_clock)
 481 {
 482         int bpp = convert_bpc_to_bpp(connector->display_info.bpc);
 483         int lane_num, max_pix_clock;
 484
 485         if (radeon_connector_encoder_get_dp_bridge_encoder_id(connector) ==
 486             ENCODER_OBJECT_ID_NUTMEG)
 487                 return 270000;
 488
 489         lane_num = radeon_dp_get_dp_lane_number(connector, dpcd, pix_clock);
 490         max_pix_clock = dp_get_max_dp_pix_clock(162000, lane_num, bpp);
 491         if (pix_clock <= max_pix_clock)
 492                 return 162000;
 493         max_pix_clock = dp_get_max_dp_pix_clock(270000, lane_num, bpp);
 494         if (pix_clock <= max_pix_clock)
 495                 return 270000;
 496         if (radeon_connector_is_dp12_capable(connector)) {
 497                 max_pix_clock = dp_get_max_dp_pix_clock(540000, lane_num, bpp);
 498                 if (pix_clock <= max_pix_clock)
 499                         return 540000;
 500         }
 501
 502         return dp_get_max_link_rate(dpcd);
 503 }
 504
 505 static u8 radeon_dp_encoder_service(struct radeon_device *rdev,
 506                                     int action, int dp_clock,
 507                                     u8 ucconfig, u8 lane_num)
 508 {
 509         DP_ENCODER_SERVICE_PARAMETERS args;
 510         int index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
 511
 512         memset(&args, 0, sizeof(args));
 513         args.ucLinkClock = dp_clock / 10;
 514         args.ucConfig = ucconfig;
 515         args.ucAction = action;
 516         args.ucLaneNum = lane_num;
 517         args.ucStatus = 0;
 518
 519         atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
 520         return args.ucStatus;
 521 }
 522
 523 u8 radeon_dp_getsinktype(struct radeon_connector *radeon_connector)
 524 {
 525         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 526         struct drm_device *dev = radeon_connector->base.dev;
 527         struct radeon_device *rdev = dev->dev_private;
 528
 529         return radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_GET_SINK_TYPE, 0,
 530                                          dig_connector->dp_i2c_bus->rec.i2c_id, 0);
 531 }
 532
 533 bool radeon_dp_getdpcd(struct radeon_connector *radeon_connector)
 534 {
 535         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 536         u8 msg[25];
 537         int ret, i;
 538
 539         ret = radeon_dp_aux_native_read(radeon_connector, DP_DPCD_REV, msg, 8, 0);
 540         if (ret > 0) {
 541                 memcpy(dig_connector->dpcd, msg, 8);
 542                 DRM_DEBUG_KMS("DPCD: ");
 543                 for (i = 0; i < 8; i++)
 544                         DRM_DEBUG_KMS("%02x ", msg[i]);
 545                 DRM_DEBUG_KMS("\n");
 546                 return true;
 547         }
 548         dig_connector->dpcd[0] = 0;
 549         return false;
 550 }
 551
 552 int radeon_dp_get_panel_mode(struct drm_encoder *encoder,
 553                              struct drm_connector *connector)
 554 {
 555         struct drm_device *dev = encoder->dev;
 556         struct radeon_device *rdev = dev->dev_private;
 557         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 558         int panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
 559
 560         if (!ASIC_IS_DCE4(rdev))
 561                 return panel_mode;
 562
 563         if (radeon_connector_encoder_get_dp_bridge_encoder_id(connector) ==
 564             ENCODER_OBJECT_ID_NUTMEG)
 565                 panel_mode = DP_PANEL_MODE_INTERNAL_DP1_MODE;
 566         else if (radeon_connector_encoder_get_dp_bridge_encoder_id(connector) ==
 567                  ENCODER_OBJECT_ID_TRAVIS)
 568                 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
 569         else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
 570                 u8 tmp = radeon_read_dpcd_reg(radeon_connector, DP_EDP_CONFIGURATION_CAP);
 571                 if (tmp & 1)
 572                         panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
 573         }
 574
 575         return panel_mode;
 576 }
 577
 578 void radeon_dp_set_link_config(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
 584         if (!radeon_connector->con_priv)
 585                 return;
 586         dig_connector = radeon_connector->con_priv;
 587
 588         if ((dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) ||
 589             (dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_eDP)) {
 590                 dig_connector->dp_clock =
 591                         radeon_dp_get_dp_link_clock(connector, dig_connector->dpcd, mode->clock);
 592                 dig_connector->dp_lane_count =
 593                         radeon_dp_get_dp_lane_number(connector, dig_connector->dpcd, mode->clock);
 594         }
 595 }
 596
 597 int radeon_dp_mode_valid_helper(struct drm_connector *connector,
 598                                 struct drm_display_mode *mode)
 599 {
 600         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 601         struct radeon_connector_atom_dig *dig_connector;
 602         int dp_clock;
 603
 604         if (!radeon_connector->con_priv)
 605                 return MODE_CLOCK_HIGH;
 606         dig_connector = radeon_connector->con_priv;
 607
 608         dp_clock =
 609                 radeon_dp_get_dp_link_clock(connector, dig_connector->dpcd, mode->clock);
 610
 611         if ((dp_clock == 540000) &&
 612             (!radeon_connector_is_dp12_capable(connector)))
 613                 return MODE_CLOCK_HIGH;
 614
 615         return MODE_OK;
 616 }
 617
 618 static bool radeon_dp_get_link_status(struct radeon_connector *radeon_connector,
 619                                       u8 link_status[DP_LINK_STATUS_SIZE])
 620 {
 621         int ret;
 622         ret = radeon_dp_aux_native_read(radeon_connector, DP_LANE0_1_STATUS,
 623                                         link_status, DP_LINK_STATUS_SIZE, 100);
 624         if (ret <= 0) {
 625                 DRM_ERROR("displayport link status failed\n");
 626                 return false;
 627         }
 628
 629         DRM_DEBUG_KMS("link status %02x %02x %02x %02x %02x %02x\n",
 630                   link_status[0], link_status[1], link_status[2],
 631                   link_status[3], link_status[4], link_status[5]);
 632         return true;
 633 }
 634
 635 bool radeon_dp_needs_link_train(struct radeon_connector *radeon_connector)
 636 {
 637         u8 link_status[DP_LINK_STATUS_SIZE];
 638         struct radeon_connector_atom_dig *dig = radeon_connector->con_priv;
 639
 640         if (!radeon_dp_get_link_status(radeon_connector, link_status))
 641                 return false;
 642         if (dp_channel_eq_ok(link_status, dig->dp_lane_count))
 643                 return false;
 644         return true;
 645 }
 646
 647 struct radeon_dp_link_train_info {
 648         struct radeon_device *rdev;
 649         struct drm_encoder *encoder;
 650         struct drm_connector *connector;
 651         struct radeon_connector *radeon_connector;
 652         int enc_id;
 653         int dp_clock;
 654         int dp_lane_count;
 655         int rd_interval;
 656         bool tp3_supported;
 657         u8 dpcd[8];
 658         u8 train_set[4];
 659         u8 link_status[DP_LINK_STATUS_SIZE];
 660         u8 tries;
 661         bool use_dpencoder;
 662 };
 663
 664 static void radeon_dp_update_vs_emph(struct radeon_dp_link_train_info *dp_info)
 665 {
 666         /* set the initial vs/emph on the source */
 667         atombios_dig_transmitter_setup(dp_info->encoder,
 668                                        ATOM_TRANSMITTER_ACTION_SETUP_VSEMPH,
 669                                        0, dp_info->train_set[0]); /* sets all lanes at once */
 670
 671         /* set the vs/emph on the sink */
 672         radeon_dp_aux_native_write(dp_info->radeon_connector, DP_TRAINING_LANE0_SET,
 673                                    dp_info->train_set, dp_info->dp_lane_count, 0);
 674 }
 675
 676 static void radeon_dp_set_tp(struct radeon_dp_link_train_info *dp_info, int tp)
 677 {
 678         int rtp = 0;
 679
 680         /* set training pattern on the source */
 681         if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder) {
 682                 switch (tp) {
 683                 case DP_TRAINING_PATTERN_1:
 684                         rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN1;
 685                         break;
 686                 case DP_TRAINING_PATTERN_2:
 687                         rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN2;
 688                         break;
 689                 case DP_TRAINING_PATTERN_3:
 690                         rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN3;
 691                         break;
 692                 }
 693                 atombios_dig_encoder_setup(dp_info->encoder, rtp, 0);
 694         } else {
 695                 switch (tp) {
 696                 case DP_TRAINING_PATTERN_1:
 697                         rtp = 0;
 698                         break;
 699                 case DP_TRAINING_PATTERN_2:
 700                         rtp = 1;
 701                         break;
 702                 }
 703                 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_PATTERN_SEL,
 704                                           dp_info->dp_clock, dp_info->enc_id, rtp);
 705         }
 706
 707         /* enable training pattern on the sink */
 708         radeon_write_dpcd_reg(dp_info->radeon_connector, DP_TRAINING_PATTERN_SET, tp);
 709 }
 710
 711 static int radeon_dp_link_train_init(struct radeon_dp_link_train_info *dp_info)
 712 {
 713         struct radeon_encoder *radeon_encoder = to_radeon_encoder(dp_info->encoder);
 714         struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
 715         u8 tmp;
 716
 717         /* power up the sink */
 718         if (dp_info->dpcd[0] >= 0x11)
 719                 radeon_write_dpcd_reg(dp_info->radeon_connector,
 720                                       DP_SET_POWER, DP_SET_POWER_D0);
 721
 722         /* possibly enable downspread on the sink */
 723         if (dp_info->dpcd[3] & 0x1)
 724                 radeon_write_dpcd_reg(dp_info->radeon_connector,
 725                                       DP_DOWNSPREAD_CTRL, DP_SPREAD_AMP_0_5);
 726         else
 727                 radeon_write_dpcd_reg(dp_info->radeon_connector,
 728                                       DP_DOWNSPREAD_CTRL, 0);
 729
 730         if ((dp_info->connector->connector_type == DRM_MODE_CONNECTOR_eDP) &&
 731             (dig->panel_mode == DP_PANEL_MODE_INTERNAL_DP2_MODE)) {
 732                 radeon_write_dpcd_reg(dp_info->radeon_connector, DP_EDP_CONFIGURATION_SET, 1);
 733         }
 734
 735         /* set the lane count on the sink */
 736         tmp = dp_info->dp_lane_count;
 737         if (dp_info->dpcd[0] >= 0x11)
 738                 tmp |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
 739         radeon_write_dpcd_reg(dp_info->radeon_connector, DP_LANE_COUNT_SET, tmp);
 740
 741         /* set the link rate on the sink */
 742         tmp = dp_get_dp_link_rate_coded(dp_info->dp_clock);
 743         radeon_write_dpcd_reg(dp_info->radeon_connector, DP_LINK_BW_SET, tmp);
 744
 745         /* start training on the source */
 746         if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder)
 747                 atombios_dig_encoder_setup(dp_info->encoder,
 748                                            ATOM_ENCODER_CMD_DP_LINK_TRAINING_START, 0);
 749         else
 750                 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_START,
 751                                           dp_info->dp_clock, dp_info->enc_id, 0);
 752
 753         /* disable the training pattern on the sink */
 754         radeon_write_dpcd_reg(dp_info->radeon_connector,
 755                               DP_TRAINING_PATTERN_SET,
 756                               DP_TRAINING_PATTERN_DISABLE);
 757
 758         return 0;
 759 }
 760
 761 static int radeon_dp_link_train_finish(struct radeon_dp_link_train_info *dp_info)
 762 {
 763         udelay(400);
 764
 765         /* disable the training pattern on the sink */
 766         radeon_write_dpcd_reg(dp_info->radeon_connector,
 767                               DP_TRAINING_PATTERN_SET,
 768                               DP_TRAINING_PATTERN_DISABLE);
 769
 770         /* disable the training pattern on the source */
 771         if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder)
 772                 atombios_dig_encoder_setup(dp_info->encoder,
 773                                            ATOM_ENCODER_CMD_DP_LINK_TRAINING_COMPLETE, 0);
 774         else
 775                 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_COMPLETE,
 776                                           dp_info->dp_clock, dp_info->enc_id, 0);
 777
 778         return 0;
 779 }
 780
 781 static int radeon_dp_link_train_cr(struct radeon_dp_link_train_info *dp_info)
 782 {
 783         bool clock_recovery;
 784         u8 voltage;
 785         int i;
 786
 787         radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_1);
 788         memset(dp_info->train_set, 0, 4);
 789         radeon_dp_update_vs_emph(dp_info);
 790
 791         udelay(400);
 792
 793         /* clock recovery loop */
 794         clock_recovery = false;
 795         dp_info->tries = 0;
 796         voltage = 0xff;
 797         while (1) {
 798                 if (dp_info->rd_interval == 0)
 799                         udelay(100);
 800                 else
 801                         mdelay(dp_info->rd_interval * 4);
 802
 803                 if (!radeon_dp_get_link_status(dp_info->radeon_connector, dp_info->link_status))
 804                         break;
 805
 806                 if (dp_clock_recovery_ok(dp_info->link_status, dp_info->dp_lane_count)) {
 807                         clock_recovery = true;
 808                         break;
 809                 }
 810
 811                 for (i = 0; i < dp_info->dp_lane_count; i++) {
 812                         if ((dp_info->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
 813                                 break;
 814                 }
 815                 if (i == dp_info->dp_lane_count) {
 816                         DRM_ERROR("clock recovery reached max voltage\n");
 817                         break;
 818                 }
 819
 820                 if ((dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
 821                         ++dp_info->tries;
 822                         if (dp_info->tries == 5) {
 823                                 DRM_ERROR("clock recovery tried 5 times\n");
 824                                 break;
 825                         }
 826                 } else
 827                         dp_info->tries = 0;
 828
 829                 voltage = dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
 830
 831                 /* Compute new train_set as requested by sink */
 832                 dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, dp_info->train_set);
 833
 834                 radeon_dp_update_vs_emph(dp_info);
 835         }
 836         if (!clock_recovery) {
 837                 DRM_ERROR("clock recovery failed\n");
 838                 return -1;
 839         } else {
 840                 DRM_DEBUG_KMS("clock recovery at voltage %d pre-emphasis %d\n",
 841                           dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
 842                           (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) >>
 843                           DP_TRAIN_PRE_EMPHASIS_SHIFT);
 844                 return 0;
 845         }
 846 }
 847
 848 static int radeon_dp_link_train_ce(struct radeon_dp_link_train_info *dp_info)
 849 {
 850         bool channel_eq;
 851
 852         if (dp_info->tp3_supported)
 853                 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_3);
 854         else
 855                 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_2);
 856
 857         /* channel equalization loop */
 858         dp_info->tries = 0;
 859         channel_eq = false;
 860         while (1) {
 861                 if (dp_info->rd_interval == 0)
 862                         udelay(400);
 863                 else
 864                         mdelay(dp_info->rd_interval * 4);
 865
 866                 if (!radeon_dp_get_link_status(dp_info->radeon_connector, dp_info->link_status))
 867                         break;
 868
 869                 if (dp_channel_eq_ok(dp_info->link_status, dp_info->dp_lane_count)) {
 870                         channel_eq = true;
 871                         break;
 872                 }
 873
 874                 /* Try 5 times */
 875                 if (dp_info->tries > 5) {
 876                         DRM_ERROR("channel eq failed: 5 tries\n");
 877                         break;
 878                 }
 879
 880                 /* Compute new train_set as requested by sink */
 881                 dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, dp_info->train_set);
 882
 883                 radeon_dp_update_vs_emph(dp_info);
 884                 dp_info->tries++;
 885         }
 886
 887         if (!channel_eq) {
 888                 DRM_ERROR("channel eq failed\n");
 889                 return -1;
 890         } else {
 891                 DRM_DEBUG_KMS("channel eq at voltage %d pre-emphasis %d\n",
 892                           dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
 893                           (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK)
 894                           >> DP_TRAIN_PRE_EMPHASIS_SHIFT);
 895                 return 0;
 896         }
 897 }
 898
 899 void radeon_dp_link_train(struct drm_encoder *encoder,
 900                           struct drm_connector *connector)
 901 {
 902         struct drm_device *dev = encoder->dev;
 903         struct radeon_device *rdev = dev->dev_private;
 904         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 905         struct radeon_encoder_atom_dig *dig;
 906         struct radeon_connector *radeon_connector;
 907         struct radeon_connector_atom_dig *dig_connector;
 908         struct radeon_dp_link_train_info dp_info;
 909         int index;
 910         u8 tmp, frev, crev;
 911
 912         if (!radeon_encoder->enc_priv)
 913                 return;
 914         dig = radeon_encoder->enc_priv;
 915
 916         radeon_connector = to_radeon_connector(connector);
 917         if (!radeon_connector->con_priv)
 918                 return;
 919         dig_connector = radeon_connector->con_priv;
 920
 921         if ((dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_DISPLAYPORT) &&
 922             (dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_eDP))
 923                 return;
 924
 925         /* DPEncoderService newer than 1.1 can't program properly the
 926          * training pattern. When facing such version use the
 927          * DIGXEncoderControl (X== 1 | 2)
 928          */
 929         dp_info.use_dpencoder = true;
 930         index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
 931         if (atom_parse_cmd_header(rdev->mode_info.atom_context, index, &frev, &crev)) {
 932                 if (crev > 1) {
 933                         dp_info.use_dpencoder = false;
 934                 }
 935         }
 936
 937         dp_info.enc_id = 0;
 938         if (dig->dig_encoder)
 939                 dp_info.enc_id |= ATOM_DP_CONFIG_DIG2_ENCODER;
 940         else
 941                 dp_info.enc_id |= ATOM_DP_CONFIG_DIG1_ENCODER;
 942         if (dig->linkb)
 943                 dp_info.enc_id |= ATOM_DP_CONFIG_LINK_B;
 944         else
 945                 dp_info.enc_id |= ATOM_DP_CONFIG_LINK_A;
 946
 947         dp_info.rd_interval = radeon_read_dpcd_reg(radeon_connector, DP_TRAINING_AUX_RD_INTERVAL);
 948         tmp = radeon_read_dpcd_reg(radeon_connector, DP_MAX_LANE_COUNT);
 949         if (ASIC_IS_DCE5(rdev) && (tmp & DP_TPS3_SUPPORTED))
 950                 dp_info.tp3_supported = true;
 951         else
 952                 dp_info.tp3_supported = false;
 953
 954         memcpy(dp_info.dpcd, dig_connector->dpcd, 8);
 955         dp_info.rdev = rdev;
 956         dp_info.encoder = encoder;
 957         dp_info.connector = connector;
 958         dp_info.radeon_connector = radeon_connector;
 959         dp_info.dp_lane_count = dig_connector->dp_lane_count;
 960         dp_info.dp_clock = dig_connector->dp_clock;
 961
 962         if (radeon_dp_link_train_init(&dp_info))
 963                 goto done;
 964         if (radeon_dp_link_train_cr(&dp_info))
 965                 goto done;
 966         if (radeon_dp_link_train_ce(&dp_info))
 967                 goto done;
 968 done:
 969         if (radeon_dp_link_train_finish(&dp_info))
 970                 return;
 971 }