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  *          Jerome Glisse
  26  */
  27 #include <drm/drmP.h>
  28 #include <drm/radeon_drm.h>
  29 #include "radeon.h"
  30
  31 #include "atom.h"
  32 #include "atom-bits.h"
  33 #include <drm/drm_dp_helper.h>
  34
  35 /* move these to drm_dp_helper.c/h */
  36 #define DP_LINK_CONFIGURATION_SIZE 9
  37 #define DP_LINK_STATUS_SIZE        6
  38 #define DP_DPCD_SIZE               8
  39
  40 static char *voltage_names[] = {
  41         "0.4V", "0.6V", "0.8V", "1.2V"
  42 };
  43 static char *pre_emph_names[] = {
  44         "0dB", "3.5dB", "6dB", "9.5dB"
  45 };
  46
  47 /***** radeon AUX functions *****/
  48 union aux_channel_transaction {
  49         PROCESS_AUX_CHANNEL_TRANSACTION_PS_ALLOCATION v1;
  50         PROCESS_AUX_CHANNEL_TRANSACTION_PARAMETERS_V2 v2;
  51 };
  52
  53 static int radeon_process_aux_ch(struct radeon_i2c_chan *chan,
  54                                  u8 *send, int send_bytes,
  55                                  u8 *recv, int recv_size,
  56                                  u8 delay, u8 *ack)
  57 {
  58         struct drm_device *dev = chan->dev;
  59         struct radeon_device *rdev = dev->dev_private;
  60         union aux_channel_transaction args;
  61         int index = GetIndexIntoMasterTable(COMMAND, ProcessAuxChannelTransaction);
  62         unsigned char *base;
  63         int recv_bytes;
  64
  65         memset(&args, 0, sizeof(args));
  66
  67         base = (unsigned char *)(rdev->mode_info.atom_context->scratch + 1);
  68
  69         memcpy(base, send, send_bytes);
  70
  71         args.v1.lpAuxRequest = 0 + 4;
  72         args.v1.lpDataOut = 16 + 4;
  73         args.v1.ucDataOutLen = 0;
  74         args.v1.ucChannelID = chan->rec.i2c_id;
  75         args.v1.ucDelay = delay / 10;
  76         if (ASIC_IS_DCE4(rdev))
  77                 args.v2.ucHPD_ID = chan->rec.hpd;
  78
  79         atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
  80
  81         *ack = args.v1.ucReplyStatus;
  82
  83         /* timeout */
  84         if (args.v1.ucReplyStatus == 1) {
  85                 DRM_DEBUG_KMS("dp_aux_ch timeout\n");
  86                 return -ETIMEDOUT;
  87         }
  88
  89         /* flags not zero */
  90         if (args.v1.ucReplyStatus == 2) {
  91                 DRM_DEBUG_KMS("dp_aux_ch flags not zero\n");
  92                 return -EBUSY;
  93         }
  94
  95         /* error */
  96         if (args.v1.ucReplyStatus == 3) {
  97                 DRM_DEBUG_KMS("dp_aux_ch error\n");
  98                 return -EIO;
  99         }
 100
 101         recv_bytes = args.v1.ucDataOutLen;
 102         if (recv_bytes > recv_size)
 103                 recv_bytes = recv_size;
 104
 105         if (recv && recv_size)
 106                 memcpy(recv, base + 16, recv_bytes);
 107
 108         return recv_bytes;
 109 }
 110
 111 static int radeon_dp_aux_native_write(struct radeon_connector *radeon_connector,
 112                                       u16 address, u8 *send, u8 send_bytes, u8 delay)
 113 {
 114         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 115         int ret;
 116         u8 msg[20];
 117         int msg_bytes = send_bytes + 4;
 118         u8 ack;
 119         unsigned retry;
 120
 121         if (send_bytes > 16)
 122                 return -1;
 123
 124         msg[0] = address;
 125         msg[1] = address >> 8;
 126         msg[2] = AUX_NATIVE_WRITE << 4;
 127         msg[3] = (msg_bytes << 4) | (send_bytes - 1);
 128         memcpy(&msg[4], send, send_bytes);
 129
 130         for (retry = 0; retry < 4; retry++) {
 131                 ret = radeon_process_aux_ch(dig_connector->dp_i2c_bus,
 132                                             msg, msg_bytes, NULL, 0, delay, &ack);
 133                 if (ret == -EBUSY)
 134                         continue;
 135                 else if (ret < 0)
 136                         return ret;
 137                 if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_ACK)
 138                         return send_bytes;
 139                 else if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_DEFER)
 140                         udelay(400);
 141                 else
 142                         return -EIO;
 143         }
 144
 145         return -EIO;
 146 }
 147
 148 static int radeon_dp_aux_native_read(struct radeon_connector *radeon_connector,
 149                                      u16 address, u8 *recv, int recv_bytes, u8 delay)
 150 {
 151         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 152         u8 msg[4];
 153         int msg_bytes = 4;
 154         u8 ack;
 155         int ret;
 156         unsigned retry;
 157
 158         msg[0] = address;
 159         msg[1] = address >> 8;
 160         msg[2] = AUX_NATIVE_READ << 4;
 161         msg[3] = (msg_bytes << 4) | (recv_bytes - 1);
 162
 163         for (retry = 0; retry < 4; retry++) {
 164                 ret = radeon_process_aux_ch(dig_connector->dp_i2c_bus,
 165                                             msg, msg_bytes, recv, recv_bytes, delay, &ack);
 166                 if (ret == -EBUSY)
 167                         continue;
 168                 else if (ret < 0)
 169                         return ret;
 170                 if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_ACK)
 171                         return ret;
 172                 else if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_DEFER)
 173                         udelay(400);
 174                 else if (ret == 0)
 175                         return -EPROTO;
 176                 else
 177                         return -EIO;
 178         }
 179
 180         return -EIO;
 181 }
 182
 183 static void radeon_write_dpcd_reg(struct radeon_connector *radeon_connector,
 184                                  u16 reg, u8 val)
 185 {
 186         radeon_dp_aux_native_write(radeon_connector, reg, &val, 1, 0);
 187 }
 188
 189 static u8 radeon_read_dpcd_reg(struct radeon_connector *radeon_connector,
 190                                u16 reg)
 191 {
 192         u8 val = 0;
 193
 194         radeon_dp_aux_native_read(radeon_connector, reg, &val, 1, 0);
 195
 196         return val;
 197 }
 198
 199 int radeon_dp_i2c_aux_ch(struct i2c_adapter *adapter, int mode,
 200                          u8 write_byte, u8 *read_byte)
 201 {
 202         struct i2c_algo_dp_aux_data *algo_data = adapter->algo_data;
 203         struct radeon_i2c_chan *auxch = (struct radeon_i2c_chan *)adapter;
 204         u16 address = algo_data->address;
 205         u8 msg[5];
 206         u8 reply[2];
 207         unsigned retry;
 208         int msg_bytes;
 209         int reply_bytes = 1;
 210         int ret;
 211         u8 ack;
 212
 213         /* Set up the command byte */
 214         if (mode & MODE_I2C_READ)
 215                 msg[2] = AUX_I2C_READ << 4;
 216         else
 217                 msg[2] = AUX_I2C_WRITE << 4;
 218
 219         if (!(mode & MODE_I2C_STOP))
 220                 msg[2] |= AUX_I2C_MOT << 4;
 221
 222         msg[0] = address;
 223         msg[1] = address >> 8;
 224
 225         switch (mode) {
 226         case MODE_I2C_WRITE:
 227                 msg_bytes = 5;
 228                 msg[3] = msg_bytes << 4;
 229                 msg[4] = write_byte;
 230                 break;
 231         case MODE_I2C_READ:
 232                 msg_bytes = 4;
 233                 msg[3] = msg_bytes << 4;
 234                 break;
 235         default:
 236                 msg_bytes = 4;
 237                 msg[3] = 3 << 4;
 238                 break;
 239         }
 240
 241         for (retry = 0; retry < 4; retry++) {
 242                 ret = radeon_process_aux_ch(auxch,
 243                                             msg, msg_bytes, reply, reply_bytes, 0, &ack);
 244                 if (ret == -EBUSY)
 245                         continue;
 246                 else if (ret < 0) {
 247                         DRM_DEBUG_KMS("aux_ch failed %d\n", ret);
 248                         return ret;
 249                 }
 250
 251                 switch (ack & AUX_NATIVE_REPLY_MASK) {
 252                 case AUX_NATIVE_REPLY_ACK:
 253                         /* I2C-over-AUX Reply field is only valid
 254                          * when paired with AUX ACK.
 255                          */
 256                         break;
 257                 case AUX_NATIVE_REPLY_NACK:
 258                         DRM_DEBUG_KMS("aux_ch native nack\n");
 259                         return -EREMOTEIO;
 260                 case AUX_NATIVE_REPLY_DEFER:
 261                         DRM_DEBUG_KMS("aux_ch native defer\n");
 262                         udelay(400);
 263                         continue;
 264                 default:
 265                         DRM_ERROR("aux_ch invalid native reply 0x%02x\n", ack);
 266                         return -EREMOTEIO;
 267                 }
 268
 269                 switch (ack & AUX_I2C_REPLY_MASK) {
 270                 case AUX_I2C_REPLY_ACK:
 271                         if (mode == MODE_I2C_READ)
 272                                 *read_byte = reply[0];
 273                         return ret;
 274                 case AUX_I2C_REPLY_NACK:
 275                         DRM_DEBUG_KMS("aux_i2c nack\n");
 276                         return -EREMOTEIO;
 277                 case AUX_I2C_REPLY_DEFER:
 278                         DRM_DEBUG_KMS("aux_i2c defer\n");
 279                         udelay(400);
 280                         break;
 281                 default:
 282                         DRM_ERROR("aux_i2c invalid reply 0x%02x\n", ack);
 283                         return -EREMOTEIO;
 284                 }
 285         }
 286
 287         DRM_DEBUG_KMS("aux i2c too many retries, giving up\n");
 288         return -EREMOTEIO;
 289 }
 290
 291 /***** general DP utility functions *****/
 292
 293 static u8 dp_link_status(u8 link_status[DP_LINK_STATUS_SIZE], int r)
 294 {
 295         return link_status[r - DP_LANE0_1_STATUS];
 296 }
 297
 298 static u8 dp_get_lane_status(u8 link_status[DP_LINK_STATUS_SIZE],
 299                              int lane)
 300 {
 301         int i = DP_LANE0_1_STATUS + (lane >> 1);
 302         int s = (lane & 1) * 4;
 303         u8 l = dp_link_status(link_status, i);
 304         return (l >> s) & 0xf;
 305 }
 306
 307 static bool dp_clock_recovery_ok(u8 link_status[DP_LINK_STATUS_SIZE],
 308                                  int lane_count)
 309 {
 310         int lane;
 311         u8 lane_status;
 312
 313         for (lane = 0; lane < lane_count; lane++) {
 314                 lane_status = dp_get_lane_status(link_status, lane);
 315                 if ((lane_status & DP_LANE_CR_DONE) == 0)
 316                         return false;
 317         }
 318         return true;
 319 }
 320
 321 static bool dp_channel_eq_ok(u8 link_status[DP_LINK_STATUS_SIZE],
 322                              int lane_count)
 323 {
 324         u8 lane_align;
 325         u8 lane_status;
 326         int lane;
 327
 328         lane_align = dp_link_status(link_status,
 329                                     DP_LANE_ALIGN_STATUS_UPDATED);
 330         if ((lane_align & DP_INTERLANE_ALIGN_DONE) == 0)
 331                 return false;
 332         for (lane = 0; lane < lane_count; lane++) {
 333                 lane_status = dp_get_lane_status(link_status, lane);
 334                 if ((lane_status & DP_CHANNEL_EQ_BITS) != DP_CHANNEL_EQ_BITS)
 335                         return false;
 336         }
 337         return true;
 338 }
 339
 340 static u8 dp_get_adjust_request_voltage(u8 link_status[DP_LINK_STATUS_SIZE],
 341                                         int lane)
 342
 343 {
 344         int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1);
 345         int s = ((lane & 1) ?
 346                  DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT :
 347                  DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT);
 348         u8 l = dp_link_status(link_status, i);
 349
 350         return ((l >> s) & 0x3) << DP_TRAIN_VOLTAGE_SWING_SHIFT;
 351 }
 352
 353 static u8 dp_get_adjust_request_pre_emphasis(u8 link_status[DP_LINK_STATUS_SIZE],
 354                                              int lane)
 355 {
 356         int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1);
 357         int s = ((lane & 1) ?
 358                  DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT :
 359                  DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT);
 360         u8 l = dp_link_status(link_status, i);
 361
 362         return ((l >> s) & 0x3) << DP_TRAIN_PRE_EMPHASIS_SHIFT;
 363 }
 364
 365 #define DP_VOLTAGE_MAX         DP_TRAIN_VOLTAGE_SWING_1200
 366 #define DP_PRE_EMPHASIS_MAX    DP_TRAIN_PRE_EMPHASIS_9_5
 367
 368 static void dp_get_adjust_train(u8 link_status[DP_LINK_STATUS_SIZE],
 369                                 int lane_count,
 370                                 u8 train_set[4])
 371 {
 372         u8 v = 0;
 373         u8 p = 0;
 374         int lane;
 375
 376         for (lane = 0; lane < lane_count; lane++) {
 377                 u8 this_v = dp_get_adjust_request_voltage(link_status, lane);
 378                 u8 this_p = dp_get_adjust_request_pre_emphasis(link_status, lane);
 379
 380                 DRM_DEBUG_KMS("requested signal parameters: lane %d voltage %s pre_emph %s\n",
 381                           lane,
 382                           voltage_names[this_v >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
 383                           pre_emph_names[this_p >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
 384
 385                 if (this_v > v)
 386                         v = this_v;
 387                 if (this_p > p)
 388                         p = this_p;
 389         }
 390
 391         if (v >= DP_VOLTAGE_MAX)
 392                 v |= DP_TRAIN_MAX_SWING_REACHED;
 393
 394         if (p >= DP_PRE_EMPHASIS_MAX)
 395                 p |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
 396
 397         DRM_DEBUG_KMS("using signal parameters: voltage %s pre_emph %s\n",
 398                   voltage_names[(v & DP_TRAIN_VOLTAGE_SWING_MASK) >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
 399                   pre_emph_names[(p & DP_TRAIN_PRE_EMPHASIS_MASK) >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
 400
 401         for (lane = 0; lane < 4; lane++)
 402                 train_set[lane] = v | p;
 403 }
 404
 405 /* convert bits per color to bits per pixel */
 406 /* get bpc from the EDID */
 407 static int convert_bpc_to_bpp(int bpc)
 408 {
 409         if (bpc == 0)
 410                 return 24;
 411         else
 412                 return bpc * 3;
 413 }
 414
 415 /* get the max pix clock supported by the link rate and lane num */
 416 static int dp_get_max_dp_pix_clock(int link_rate,
 417                                    int lane_num,
 418                                    int bpp)
 419 {
 420         return (link_rate * lane_num * 8) / bpp;
 421 }
 422
 423 static int dp_get_max_link_rate(u8 dpcd[DP_DPCD_SIZE])
 424 {
 425         switch (dpcd[DP_MAX_LINK_RATE]) {
 426         case DP_LINK_BW_1_62:
 427         default:
 428                 return 162000;
 429         case DP_LINK_BW_2_7:
 430                 return 270000;
 431         case DP_LINK_BW_5_4:
 432                 return 540000;
 433         }
 434 }
 435
 436 static u8 dp_get_max_lane_number(u8 dpcd[DP_DPCD_SIZE])
 437 {
 438         return dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;
 439 }
 440
 441 static u8 dp_get_dp_link_rate_coded(int link_rate)
 442 {
 443         switch (link_rate) {
 444         case 162000:
 445         default:
 446                 return DP_LINK_BW_1_62;
 447         case 270000:
 448                 return DP_LINK_BW_2_7;
 449         case 540000:
 450                 return DP_LINK_BW_5_4;
 451         }
 452 }
 453
 454 /***** radeon specific DP functions *****/
 455
 456 /* First get the min lane# when low rate is used according to pixel clock
 457  * (prefer low rate), second check max lane# supported by DP panel,
 458  * if the max lane# < low rate lane# then use max lane# instead.
 459  */
 460 static int radeon_dp_get_dp_lane_number(struct drm_connector *connector,
 461                                         u8 dpcd[DP_DPCD_SIZE],
 462                                         int pix_clock)
 463 {
 464         int bpp = convert_bpc_to_bpp(radeon_get_monitor_bpc(connector));
 465         int max_link_rate = dp_get_max_link_rate(dpcd);
 466         int max_lane_num = dp_get_max_lane_number(dpcd);
 467         int lane_num;
 468         int max_dp_pix_clock;
 469
 470         for (lane_num = 1; lane_num < max_lane_num; lane_num <<= 1) {
 471                 max_dp_pix_clock = dp_get_max_dp_pix_clock(max_link_rate, lane_num, bpp);
 472                 if (pix_clock <= max_dp_pix_clock)
 473                         break;
 474         }
 475
 476         return lane_num;
 477 }
 478
 479 static int radeon_dp_get_dp_link_clock(struct drm_connector *connector,
 480                                        u8 dpcd[DP_DPCD_SIZE],
 481                                        int pix_clock)
 482 {
 483         int bpp = convert_bpc_to_bpp(radeon_get_monitor_bpc(connector));
 484         int lane_num, max_pix_clock;
 485
 486         if (radeon_connector_encoder_get_dp_bridge_encoder_id(connector) ==
 487             ENCODER_OBJECT_ID_NUTMEG)
 488                 return 270000;
 489
 490         lane_num = radeon_dp_get_dp_lane_number(connector, dpcd, pix_clock);
 491         max_pix_clock = dp_get_max_dp_pix_clock(162000, lane_num, bpp);
 492         if (pix_clock <= max_pix_clock)
 493                 return 162000;
 494         max_pix_clock = dp_get_max_dp_pix_clock(270000, lane_num, bpp);
 495         if (pix_clock <= max_pix_clock)
 496                 return 270000;
 497         if (radeon_connector_is_dp12_capable(connector)) {
 498                 max_pix_clock = dp_get_max_dp_pix_clock(540000, lane_num, bpp);
 499                 if (pix_clock <= max_pix_clock)
 500                         return 540000;
 501         }
 502
 503         return dp_get_max_link_rate(dpcd);
 504 }
 505
 506 static u8 radeon_dp_encoder_service(struct radeon_device *rdev,
 507                                     int action, int dp_clock,
 508                                     u8 ucconfig, u8 lane_num)
 509 {
 510         DP_ENCODER_SERVICE_PARAMETERS args;
 511         int index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
 512
 513         memset(&args, 0, sizeof(args));
 514         args.ucLinkClock = dp_clock / 10;
 515         args.ucConfig = ucconfig;
 516         args.ucAction = action;
 517         args.ucLaneNum = lane_num;
 518         args.ucStatus = 0;
 519
 520         atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
 521         return args.ucStatus;
 522 }
 523
 524 u8 radeon_dp_getsinktype(struct radeon_connector *radeon_connector)
 525 {
 526         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 527         struct drm_device *dev = radeon_connector->base.dev;
 528         struct radeon_device *rdev = dev->dev_private;
 529
 530         return radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_GET_SINK_TYPE, 0,
 531                                          dig_connector->dp_i2c_bus->rec.i2c_id, 0);
 532 }
 533
 534 static void radeon_dp_probe_oui(struct radeon_connector *radeon_connector)
 535 {
 536         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 537         u8 buf[3];
 538
 539         if (!(dig_connector->dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT))
 540                 return;
 541
 542         if (radeon_dp_aux_native_read(radeon_connector, DP_SINK_OUI, buf, 3, 0))
 543                 DRM_DEBUG_KMS("Sink OUI: %02hx%02hx%02hx\n",
 544                               buf[0], buf[1], buf[2]);
 545
 546         if (radeon_dp_aux_native_read(radeon_connector, DP_BRANCH_OUI, buf, 3, 0))
 547                 DRM_DEBUG_KMS("Branch OUI: %02hx%02hx%02hx\n",
 548                               buf[0], buf[1], buf[2]);
 549 }
 550
 551 bool radeon_dp_getdpcd(struct radeon_connector *radeon_connector)
 552 {
 553         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 554         u8 msg[25];
 555         int ret, i;
 556
 557         ret = radeon_dp_aux_native_read(radeon_connector, DP_DPCD_REV, msg, 8, 0);
 558         if (ret > 0) {
 559                 memcpy(dig_connector->dpcd, msg, 8);
 560                 DRM_DEBUG_KMS("DPCD: ");
 561                 for (i = 0; i < 8; i++)
 562                         DRM_DEBUG_KMS("%02x ", msg[i]);
 563                 DRM_DEBUG_KMS("\n");
 564
 565                 radeon_dp_probe_oui(radeon_connector);
 566
 567                 return true;
 568         }
 569         dig_connector->dpcd[0] = 0;
 570         return false;
 571 }
 572
 573 int radeon_dp_get_panel_mode(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_connector *radeon_connector = to_radeon_connector(connector);
 579         int panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
 580         u16 dp_bridge = radeon_connector_encoder_get_dp_bridge_encoder_id(connector);
 581         u8 tmp;
 582
 583         if (!ASIC_IS_DCE4(rdev))
 584                 return panel_mode;
 585
 586         if (dp_bridge != ENCODER_OBJECT_ID_NONE) {
 587                 /* DP bridge chips */
 588                 tmp = radeon_read_dpcd_reg(radeon_connector, DP_EDP_CONFIGURATION_CAP);
 589                 if (tmp & 1)
 590                         panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
 591                 else if ((dp_bridge == ENCODER_OBJECT_ID_NUTMEG) ||
 592                          (dp_bridge == ENCODER_OBJECT_ID_TRAVIS))
 593                         panel_mode = DP_PANEL_MODE_INTERNAL_DP1_MODE;
 594                 else
 595                         panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
 596         } else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
 597                 /* eDP */
 598                 tmp = radeon_read_dpcd_reg(radeon_connector, DP_EDP_CONFIGURATION_CAP);
 599                 if (tmp & 1)
 600                         panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
 601         }
 602
 603         return panel_mode;
 604 }
 605
 606 void radeon_dp_set_link_config(struct drm_connector *connector,
 607                                const struct drm_display_mode *mode)
 608 {
 609         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 610         struct radeon_connector_atom_dig *dig_connector;
 611
 612         if (!radeon_connector->con_priv)
 613                 return;
 614         dig_connector = radeon_connector->con_priv;
 615
 616         if ((dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) ||
 617             (dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_eDP)) {
 618                 dig_connector->dp_clock =
 619                         radeon_dp_get_dp_link_clock(connector, dig_connector->dpcd, mode->clock);
 620                 dig_connector->dp_lane_count =
 621                         radeon_dp_get_dp_lane_number(connector, dig_connector->dpcd, mode->clock);
 622         }
 623 }
 624
 625 int radeon_dp_mode_valid_helper(struct drm_connector *connector,
 626                                 struct drm_display_mode *mode)
 627 {
 628         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 629         struct radeon_connector_atom_dig *dig_connector;
 630         int dp_clock;
 631
 632         if (!radeon_connector->con_priv)
 633                 return MODE_CLOCK_HIGH;
 634         dig_connector = radeon_connector->con_priv;
 635
 636         dp_clock =
 637                 radeon_dp_get_dp_link_clock(connector, dig_connector->dpcd, mode->clock);
 638
 639         if ((dp_clock == 540000) &&
 640             (!radeon_connector_is_dp12_capable(connector)))
 641                 return MODE_CLOCK_HIGH;
 642
 643         return MODE_OK;
 644 }
 645
 646 static bool radeon_dp_get_link_status(struct radeon_connector *radeon_connector,
 647                                       u8 link_status[DP_LINK_STATUS_SIZE])
 648 {
 649         int ret;
 650         ret = radeon_dp_aux_native_read(radeon_connector, DP_LANE0_1_STATUS,
 651                                         link_status, DP_LINK_STATUS_SIZE, 100);
 652         if (ret <= 0) {
 653                 return false;
 654         }
 655
 656         DRM_DEBUG_KMS("link status %*ph\n", 6, link_status);
 657         return true;
 658 }
 659
 660 bool radeon_dp_needs_link_train(struct radeon_connector *radeon_connector)
 661 {
 662         u8 link_status[DP_LINK_STATUS_SIZE];
 663         struct radeon_connector_atom_dig *dig = radeon_connector->con_priv;
 664
 665         if (!radeon_dp_get_link_status(radeon_connector, link_status))
 666                 return false;
 667         if (dp_channel_eq_ok(link_status, dig->dp_lane_count))
 668                 return false;
 669         return true;
 670 }
 671
 672 struct radeon_dp_link_train_info {
 673         struct radeon_device *rdev;
 674         struct drm_encoder *encoder;
 675         struct drm_connector *connector;
 676         struct radeon_connector *radeon_connector;
 677         int enc_id;
 678         int dp_clock;
 679         int dp_lane_count;
 680         int rd_interval;
 681         bool tp3_supported;
 682         u8 dpcd[8];
 683         u8 train_set[4];
 684         u8 link_status[DP_LINK_STATUS_SIZE];
 685         u8 tries;
 686         bool use_dpencoder;
 687 };
 688
 689 static void radeon_dp_update_vs_emph(struct radeon_dp_link_train_info *dp_info)
 690 {
 691         /* set the initial vs/emph on the source */
 692         atombios_dig_transmitter_setup(dp_info->encoder,
 693                                        ATOM_TRANSMITTER_ACTION_SETUP_VSEMPH,
 694                                        0, dp_info->train_set[0]); /* sets all lanes at once */
 695
 696         /* set the vs/emph on the sink */
 697         radeon_dp_aux_native_write(dp_info->radeon_connector, DP_TRAINING_LANE0_SET,
 698                                    dp_info->train_set, dp_info->dp_lane_count, 0);
 699 }
 700
 701 static void radeon_dp_set_tp(struct radeon_dp_link_train_info *dp_info, int tp)
 702 {
 703         int rtp = 0;
 704
 705         /* set training pattern on the source */
 706         if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder) {
 707                 switch (tp) {
 708                 case DP_TRAINING_PATTERN_1:
 709                         rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN1;
 710                         break;
 711                 case DP_TRAINING_PATTERN_2:
 712                         rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN2;
 713                         break;
 714                 case DP_TRAINING_PATTERN_3:
 715                         rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN3;
 716                         break;
 717                 }
 718                 atombios_dig_encoder_setup(dp_info->encoder, rtp, 0);
 719         } else {
 720                 switch (tp) {
 721                 case DP_TRAINING_PATTERN_1:
 722                         rtp = 0;
 723                         break;
 724                 case DP_TRAINING_PATTERN_2:
 725                         rtp = 1;
 726                         break;
 727                 }
 728                 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_PATTERN_SEL,
 729                                           dp_info->dp_clock, dp_info->enc_id, rtp);
 730         }
 731
 732         /* enable training pattern on the sink */
 733         radeon_write_dpcd_reg(dp_info->radeon_connector, DP_TRAINING_PATTERN_SET, tp);
 734 }
 735
 736 static int radeon_dp_link_train_init(struct radeon_dp_link_train_info *dp_info)
 737 {
 738         struct radeon_encoder *radeon_encoder = to_radeon_encoder(dp_info->encoder);
 739         struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
 740         u8 tmp;
 741
 742         /* power up the sink */
 743         if (dp_info->dpcd[0] >= 0x11)
 744                 radeon_write_dpcd_reg(dp_info->radeon_connector,
 745                                       DP_SET_POWER, DP_SET_POWER_D0);
 746
 747         /* possibly enable downspread on the sink */
 748         if (dp_info->dpcd[3] & 0x1)
 749                 radeon_write_dpcd_reg(dp_info->radeon_connector,
 750                                       DP_DOWNSPREAD_CTRL, DP_SPREAD_AMP_0_5);
 751         else
 752                 radeon_write_dpcd_reg(dp_info->radeon_connector,
 753                                       DP_DOWNSPREAD_CTRL, 0);
 754
 755         if ((dp_info->connector->connector_type == DRM_MODE_CONNECTOR_eDP) &&
 756             (dig->panel_mode == DP_PANEL_MODE_INTERNAL_DP2_MODE)) {
 757                 radeon_write_dpcd_reg(dp_info->radeon_connector, DP_EDP_CONFIGURATION_SET, 1);
 758         }
 759
 760         /* set the lane count on the sink */
 761         tmp = dp_info->dp_lane_count;
 762         if (dp_info->dpcd[DP_DPCD_REV] >= 0x11 &&
 763             dp_info->dpcd[DP_MAX_LANE_COUNT] & DP_ENHANCED_FRAME_CAP)
 764                 tmp |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
 765         radeon_write_dpcd_reg(dp_info->radeon_connector, DP_LANE_COUNT_SET, tmp);
 766
 767         /* set the link rate on the sink */
 768         tmp = dp_get_dp_link_rate_coded(dp_info->dp_clock);
 769         radeon_write_dpcd_reg(dp_info->radeon_connector, DP_LINK_BW_SET, tmp);
 770
 771         /* start training on the source */
 772         if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder)
 773                 atombios_dig_encoder_setup(dp_info->encoder,
 774                                            ATOM_ENCODER_CMD_DP_LINK_TRAINING_START, 0);
 775         else
 776                 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_START,
 777                                           dp_info->dp_clock, dp_info->enc_id, 0);
 778
 779         /* disable the training pattern on the sink */
 780         radeon_write_dpcd_reg(dp_info->radeon_connector,
 781                               DP_TRAINING_PATTERN_SET,
 782                               DP_TRAINING_PATTERN_DISABLE);
 783
 784         return 0;
 785 }
 786
 787 static int radeon_dp_link_train_finish(struct radeon_dp_link_train_info *dp_info)
 788 {
 789         udelay(400);
 790
 791         /* disable the training pattern on the sink */
 792         radeon_write_dpcd_reg(dp_info->radeon_connector,
 793                               DP_TRAINING_PATTERN_SET,
 794                               DP_TRAINING_PATTERN_DISABLE);
 795
 796         /* disable the training pattern on the source */
 797         if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder)
 798                 atombios_dig_encoder_setup(dp_info->encoder,
 799                                            ATOM_ENCODER_CMD_DP_LINK_TRAINING_COMPLETE, 0);
 800         else
 801                 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_COMPLETE,
 802                                           dp_info->dp_clock, dp_info->enc_id, 0);
 803
 804         return 0;
 805 }
 806
 807 static int radeon_dp_link_train_cr(struct radeon_dp_link_train_info *dp_info)
 808 {
 809         bool clock_recovery;
 810         u8 voltage;
 811         int i;
 812
 813         radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_1);
 814         memset(dp_info->train_set, 0, 4);
 815         radeon_dp_update_vs_emph(dp_info);
 816
 817         udelay(400);
 818
 819         /* clock recovery loop */
 820         clock_recovery = false;
 821         dp_info->tries = 0;
 822         voltage = 0xff;
 823         while (1) {
 824                 if (dp_info->rd_interval == 0)
 825                         udelay(100);
 826                 else
 827                         mdelay(dp_info->rd_interval * 4);
 828
 829                 if (!radeon_dp_get_link_status(dp_info->radeon_connector, dp_info->link_status)) {
 830                         DRM_ERROR("displayport link status failed\n");
 831                         break;
 832                 }
 833
 834                 if (dp_clock_recovery_ok(dp_info->link_status, dp_info->dp_lane_count)) {
 835                         clock_recovery = true;
 836                         break;
 837                 }
 838
 839                 for (i = 0; i < dp_info->dp_lane_count; i++) {
 840                         if ((dp_info->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
 841                                 break;
 842                 }
 843                 if (i == dp_info->dp_lane_count) {
 844                         DRM_ERROR("clock recovery reached max voltage\n");
 845                         break;
 846                 }
 847
 848                 if ((dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
 849                         ++dp_info->tries;
 850                         if (dp_info->tries == 5) {
 851                                 DRM_ERROR("clock recovery tried 5 times\n");
 852                                 break;
 853                         }
 854                 } else
 855                         dp_info->tries = 0;
 856
 857                 voltage = dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
 858
 859                 /* Compute new train_set as requested by sink */
 860                 dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, dp_info->train_set);
 861
 862                 radeon_dp_update_vs_emph(dp_info);
 863         }
 864         if (!clock_recovery) {
 865                 DRM_ERROR("clock recovery failed\n");
 866                 return -1;
 867         } else {
 868                 DRM_DEBUG_KMS("clock recovery at voltage %d pre-emphasis %d\n",
 869                           dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
 870                           (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) >>
 871                           DP_TRAIN_PRE_EMPHASIS_SHIFT);
 872                 return 0;
 873         }
 874 }
 875
 876 static int radeon_dp_link_train_ce(struct radeon_dp_link_train_info *dp_info)
 877 {
 878         bool channel_eq;
 879
 880         if (dp_info->tp3_supported)
 881                 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_3);
 882         else
 883                 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_2);
 884
 885         /* channel equalization loop */
 886         dp_info->tries = 0;
 887         channel_eq = false;
 888         while (1) {
 889                 if (dp_info->rd_interval == 0)
 890                         udelay(400);
 891                 else
 892                         mdelay(dp_info->rd_interval * 4);
 893
 894                 if (!radeon_dp_get_link_status(dp_info->radeon_connector, dp_info->link_status)) {
 895                         DRM_ERROR("displayport link status failed\n");
 896                         break;
 897                 }
 898
 899                 if (dp_channel_eq_ok(dp_info->link_status, dp_info->dp_lane_count)) {
 900                         channel_eq = true;
 901                         break;
 902                 }
 903
 904                 /* Try 5 times */
 905                 if (dp_info->tries > 5) {
 906                         DRM_ERROR("channel eq failed: 5 tries\n");
 907                         break;
 908                 }
 909
 910                 /* Compute new train_set as requested by sink */
 911                 dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, dp_info->train_set);
 912
 913                 radeon_dp_update_vs_emph(dp_info);
 914                 dp_info->tries++;
 915         }
 916
 917         if (!channel_eq) {
 918                 DRM_ERROR("channel eq failed\n");
 919                 return -1;
 920         } else {
 921                 DRM_DEBUG_KMS("channel eq at voltage %d pre-emphasis %d\n",
 922                           dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
 923                           (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK)
 924                           >> DP_TRAIN_PRE_EMPHASIS_SHIFT);
 925                 return 0;
 926         }
 927 }
 928
 929 void radeon_dp_link_train(struct drm_encoder *encoder,
 930                           struct drm_connector *connector)
 931 {
 932         struct drm_device *dev = encoder->dev;
 933         struct radeon_device *rdev = dev->dev_private;
 934         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 935         struct radeon_encoder_atom_dig *dig;
 936         struct radeon_connector *radeon_connector;
 937         struct radeon_connector_atom_dig *dig_connector;
 938         struct radeon_dp_link_train_info dp_info;
 939         int index;
 940         u8 tmp, frev, crev;
 941
 942         if (!radeon_encoder->enc_priv)
 943                 return;
 944         dig = radeon_encoder->enc_priv;
 945
 946         radeon_connector = to_radeon_connector(connector);
 947         if (!radeon_connector->con_priv)
 948                 return;
 949         dig_connector = radeon_connector->con_priv;
 950
 951         if ((dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_DISPLAYPORT) &&
 952             (dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_eDP))
 953                 return;
 954
 955         /* DPEncoderService newer than 1.1 can't program properly the
 956          * training pattern. When facing such version use the
 957          * DIGXEncoderControl (X== 1 | 2)
 958          */
 959         dp_info.use_dpencoder = true;
 960         index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
 961         if (atom_parse_cmd_header(rdev->mode_info.atom_context, index, &frev, &crev)) {
 962                 if (crev > 1) {
 963                         dp_info.use_dpencoder = false;
 964                 }
 965         }
 966
 967         dp_info.enc_id = 0;
 968         if (dig->dig_encoder)
 969                 dp_info.enc_id |= ATOM_DP_CONFIG_DIG2_ENCODER;
 970         else
 971                 dp_info.enc_id |= ATOM_DP_CONFIG_DIG1_ENCODER;
 972         if (dig->linkb)
 973                 dp_info.enc_id |= ATOM_DP_CONFIG_LINK_B;
 974         else
 975                 dp_info.enc_id |= ATOM_DP_CONFIG_LINK_A;
 976
 977         dp_info.rd_interval = radeon_read_dpcd_reg(radeon_connector, DP_TRAINING_AUX_RD_INTERVAL);
 978         tmp = radeon_read_dpcd_reg(radeon_connector, DP_MAX_LANE_COUNT);
 979         if (ASIC_IS_DCE5(rdev) && (tmp & DP_TPS3_SUPPORTED))
 980                 dp_info.tp3_supported = true;
 981         else
 982                 dp_info.tp3_supported = false;
 983
 984         memcpy(dp_info.dpcd, dig_connector->dpcd, 8);
 985         dp_info.rdev = rdev;
 986         dp_info.encoder = encoder;
 987         dp_info.connector = connector;
 988         dp_info.radeon_connector = radeon_connector;
 989         dp_info.dp_lane_count = dig_connector->dp_lane_count;
 990         dp_info.dp_clock = dig_connector->dp_clock;
 991
 992         if (radeon_dp_link_train_init(&dp_info))
 993                 goto done;
 994         if (radeon_dp_link_train_cr(&dp_info))
 995                 goto done;
 996         if (radeon_dp_link_train_ce(&dp_info))
 997                 goto done;
 998 done:
 999         if (radeon_dp_link_train_finish(&dp_info))
1000                 return;
1001 }