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
  28 #include <drm/radeon_drm.h>
  29 #include "radeon.h"
  30
  31 #include "atom.h"
  32 #include "atom-bits.h"
  33 #include <drm/display/drm_dp_helper.h>
  34
  35 /* move these to drm_dp_helper.c/h */
  36 #define DP_LINK_CONFIGURATION_SIZE 9
  37 #define DP_DPCD_SIZE DP_RECEIVER_CAP_SIZE
  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
  48 /* Atom needs data in little endian format so swap as appropriate when copying
  49  * data to or from atom. Note that atom operates on dw units.
  50  *
  51  * Use to_le=true when sending data to atom and provide at least
  52  * ALIGN(num_bytes,4) bytes in the dst buffer.
  53  *
  54  * Use to_le=false when receiving data from atom and provide ALIGN(num_bytes,4)
  55  * byes in the src buffer.
  56  */
  57 void radeon_atom_copy_swap(u8 *dst, u8 *src, u8 num_bytes, bool to_le)
  58 {
  59 #ifdef __BIG_ENDIAN
  60         u32 src_tmp[5], dst_tmp[5];
  61         int i;
  62         u8 align_num_bytes = ALIGN(num_bytes, 4);
  63
  64         if (to_le) {
  65                 memcpy(src_tmp, src, num_bytes);
  66                 for (i = 0; i < align_num_bytes / 4; i++)
  67                         dst_tmp[i] = cpu_to_le32(src_tmp[i]);
  68                 memcpy(dst, dst_tmp, align_num_bytes);
  69         } else {
  70                 memcpy(src_tmp, src, align_num_bytes);
  71                 for (i = 0; i < align_num_bytes / 4; i++)
  72                         dst_tmp[i] = le32_to_cpu(src_tmp[i]);
  73                 memcpy(dst, dst_tmp, num_bytes);
  74         }
  75 #else
  76         memcpy(dst, src, num_bytes);
  77 #endif
  78 }
  79
  80 union aux_channel_transaction {
  81         PROCESS_AUX_CHANNEL_TRANSACTION_PS_ALLOCATION v1;
  82         PROCESS_AUX_CHANNEL_TRANSACTION_PARAMETERS_V2 v2;
  83 };
  84
  85 static int radeon_process_aux_ch(struct radeon_i2c_chan *chan,
  86                                  u8 *send, int send_bytes,
  87                                  u8 *recv, int recv_size,
  88                                  u8 delay, u8 *ack)
  89 {
  90         struct drm_device *dev = chan->dev;
  91         struct radeon_device *rdev = dev->dev_private;
  92         union aux_channel_transaction args;
  93         int index = GetIndexIntoMasterTable(COMMAND, ProcessAuxChannelTransaction);
  94         unsigned char *base;
  95         int recv_bytes;
  96         int r = 0;
  97
  98         memset(&args, 0, sizeof(args));
  99
 100         mutex_lock(&chan->mutex);
 101         mutex_lock(&rdev->mode_info.atom_context->scratch_mutex);
 102
 103         base = (unsigned char *)(rdev->mode_info.atom_context->scratch + 1);
 104
 105         radeon_atom_copy_swap(base, send, send_bytes, true);
 106
 107         args.v1.lpAuxRequest = cpu_to_le16((u16)(0 + 4));
 108         args.v1.lpDataOut = cpu_to_le16((u16)(16 + 4));
 109         args.v1.ucDataOutLen = 0;
 110         args.v1.ucChannelID = chan->rec.i2c_id;
 111         args.v1.ucDelay = delay / 10;
 112         if (ASIC_IS_DCE4(rdev))
 113                 args.v2.ucHPD_ID = chan->rec.hpd;
 114
 115         atom_execute_table_scratch_unlocked(rdev->mode_info.atom_context, index, (uint32_t *)&args);
 116
 117         *ack = args.v1.ucReplyStatus;
 118
 119         /* timeout */
 120         if (args.v1.ucReplyStatus == 1) {
 121                 DRM_DEBUG_KMS("dp_aux_ch timeout\n");
 122                 r = -ETIMEDOUT;
 123                 goto done;
 124         }
 125
 126         /* flags not zero */
 127         if (args.v1.ucReplyStatus == 2) {
 128                 DRM_DEBUG_KMS("dp_aux_ch flags not zero\n");
 129                 r = -EIO;
 130                 goto done;
 131         }
 132
 133         /* error */
 134         if (args.v1.ucReplyStatus == 3) {
 135                 DRM_DEBUG_KMS("dp_aux_ch error\n");
 136                 r = -EIO;
 137                 goto done;
 138         }
 139
 140         recv_bytes = args.v1.ucDataOutLen;
 141         if (recv_bytes > recv_size)
 142                 recv_bytes = recv_size;
 143
 144         if (recv && recv_size)
 145                 radeon_atom_copy_swap(recv, base + 16, recv_bytes, false);
 146
 147         r = recv_bytes;
 148 done:
 149         mutex_unlock(&rdev->mode_info.atom_context->scratch_mutex);
 150         mutex_unlock(&chan->mutex);
 151
 152         return r;
 153 }
 154
 155 #define BARE_ADDRESS_SIZE 3
 156 #define HEADER_SIZE (BARE_ADDRESS_SIZE + 1)
 157
 158 static ssize_t
 159 radeon_dp_aux_transfer_atom(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
 160 {
 161         struct radeon_i2c_chan *chan =
 162                 container_of(aux, struct radeon_i2c_chan, aux);
 163         int ret;
 164         u8 tx_buf[20];
 165         size_t tx_size;
 166         u8 ack, delay = 0;
 167
 168         if (WARN_ON(msg->size > 16))
 169                 return -E2BIG;
 170
 171         tx_buf[0] = msg->address & 0xff;
 172         tx_buf[1] = (msg->address >> 8) & 0xff;
 173         tx_buf[2] = (msg->request << 4) |
 174                 ((msg->address >> 16) & 0xf);
 175         tx_buf[3] = msg->size ? (msg->size - 1) : 0;
 176
 177         switch (msg->request & ~DP_AUX_I2C_MOT) {
 178         case DP_AUX_NATIVE_WRITE:
 179         case DP_AUX_I2C_WRITE:
 180         case DP_AUX_I2C_WRITE_STATUS_UPDATE:
 181                 /* The atom implementation only supports writes with a max payload of
 182                  * 12 bytes since it uses 4 bits for the total count (header + payload)
 183                  * in the parameter space.  The atom interface supports 16 byte
 184                  * payloads for reads. The hw itself supports up to 16 bytes of payload.
 185                  */
 186                 if (WARN_ON_ONCE(msg->size > 12))
 187                         return -E2BIG;
 188                 /* tx_size needs to be 4 even for bare address packets since the atom
 189                  * table needs the info in tx_buf[3].
 190                  */
 191                 tx_size = HEADER_SIZE + msg->size;
 192                 if (msg->size == 0)
 193                         tx_buf[3] |= BARE_ADDRESS_SIZE << 4;
 194                 else
 195                         tx_buf[3] |= tx_size << 4;
 196                 memcpy(tx_buf + HEADER_SIZE, msg->buffer, msg->size);
 197                 ret = radeon_process_aux_ch(chan,
 198                                             tx_buf, tx_size, NULL, 0, delay, &ack);
 199                 if (ret >= 0)
 200                         /* Return payload size. */
 201                         ret = msg->size;
 202                 break;
 203         case DP_AUX_NATIVE_READ:
 204         case DP_AUX_I2C_READ:
 205                 /* tx_size needs to be 4 even for bare address packets since the atom
 206                  * table needs the info in tx_buf[3].
 207                  */
 208                 tx_size = HEADER_SIZE;
 209                 if (msg->size == 0)
 210                         tx_buf[3] |= BARE_ADDRESS_SIZE << 4;
 211                 else
 212                         tx_buf[3] |= tx_size << 4;
 213                 ret = radeon_process_aux_ch(chan,
 214                                             tx_buf, tx_size, msg->buffer, msg->size, delay, &ack);
 215                 break;
 216         default:
 217                 ret = -EINVAL;
 218                 break;
 219         }
 220
 221         if (ret >= 0)
 222                 msg->reply = ack >> 4;
 223
 224         return ret;
 225 }
 226
 227 void radeon_dp_aux_init(struct radeon_connector *radeon_connector)
 228 {
 229         struct drm_device *dev = radeon_connector->base.dev;
 230         struct radeon_device *rdev = dev->dev_private;
 231         int ret;
 232
 233         radeon_connector->ddc_bus->rec.hpd = radeon_connector->hpd.hpd;
 234         radeon_connector->ddc_bus->aux.dev = radeon_connector->base.kdev;
 235         radeon_connector->ddc_bus->aux.drm_dev = radeon_connector->base.dev;
 236         if (ASIC_IS_DCE5(rdev)) {
 237                 if (radeon_auxch)
 238                         radeon_connector->ddc_bus->aux.transfer = radeon_dp_aux_transfer_native;
 239                 else
 240                         radeon_connector->ddc_bus->aux.transfer = radeon_dp_aux_transfer_atom;
 241         } else {
 242                 radeon_connector->ddc_bus->aux.transfer = radeon_dp_aux_transfer_atom;
 243         }
 244
 245         ret = drm_dp_aux_register(&radeon_connector->ddc_bus->aux);
 246         if (!ret)
 247                 radeon_connector->ddc_bus->has_aux = true;
 248
 249         WARN(ret, "drm_dp_aux_register() failed with error %d\n", ret);
 250 }
 251
 252 /***** general DP utility functions *****/
 253
 254 #define DP_VOLTAGE_MAX         DP_TRAIN_VOLTAGE_SWING_LEVEL_3
 255 #define DP_PRE_EMPHASIS_MAX    DP_TRAIN_PRE_EMPH_LEVEL_3
 256
 257 static void dp_get_adjust_train(const u8 link_status[DP_LINK_STATUS_SIZE],
 258                                 int lane_count,
 259                                 u8 train_set[4])
 260 {
 261         u8 v = 0;
 262         u8 p = 0;
 263         int lane;
 264
 265         for (lane = 0; lane < lane_count; lane++) {
 266                 u8 this_v = drm_dp_get_adjust_request_voltage(link_status, lane);
 267                 u8 this_p = drm_dp_get_adjust_request_pre_emphasis(link_status, lane);
 268
 269                 DRM_DEBUG_KMS("requested signal parameters: lane %d voltage %s pre_emph %s\n",
 270                           lane,
 271                           voltage_names[this_v >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
 272                           pre_emph_names[this_p >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
 273
 274                 if (this_v > v)
 275                         v = this_v;
 276                 if (this_p > p)
 277                         p = this_p;
 278         }
 279
 280         if (v >= DP_VOLTAGE_MAX)
 281                 v |= DP_TRAIN_MAX_SWING_REACHED;
 282
 283         if (p >= DP_PRE_EMPHASIS_MAX)
 284                 p |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
 285
 286         DRM_DEBUG_KMS("using signal parameters: voltage %s pre_emph %s\n",
 287                   voltage_names[(v & DP_TRAIN_VOLTAGE_SWING_MASK) >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
 288                   pre_emph_names[(p & DP_TRAIN_PRE_EMPHASIS_MASK) >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
 289
 290         for (lane = 0; lane < 4; lane++)
 291                 train_set[lane] = v | p;
 292 }
 293
 294 /* convert bits per color to bits per pixel */
 295 /* get bpc from the EDID */
 296 static int convert_bpc_to_bpp(int bpc)
 297 {
 298         if (bpc == 0)
 299                 return 24;
 300         else
 301                 return bpc * 3;
 302 }
 303
 304 /***** radeon specific DP functions *****/
 305
 306 static int radeon_dp_get_dp_link_config(struct drm_connector *connector,
 307                                         const u8 dpcd[DP_DPCD_SIZE],
 308                                         unsigned pix_clock,
 309                                         unsigned *dp_lanes, unsigned *dp_rate)
 310 {
 311         int bpp = convert_bpc_to_bpp(radeon_get_monitor_bpc(connector));
 312         static const unsigned link_rates[3] = { 162000, 270000, 540000 };
 313         unsigned max_link_rate = drm_dp_max_link_rate(dpcd);
 314         unsigned max_lane_num = drm_dp_max_lane_count(dpcd);
 315         unsigned lane_num, i, max_pix_clock;
 316
 317         if (radeon_connector_encoder_get_dp_bridge_encoder_id(connector) ==
 318             ENCODER_OBJECT_ID_NUTMEG) {
 319                 for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) {
 320                         max_pix_clock = (lane_num * 270000 * 8) / bpp;
 321                         if (max_pix_clock >= pix_clock) {
 322                                 *dp_lanes = lane_num;
 323                                 *dp_rate = 270000;
 324                                 return 0;
 325                         }
 326                 }
 327         } else {
 328                 for (i = 0; i < ARRAY_SIZE(link_rates) && link_rates[i] <= max_link_rate; i++) {
 329                         for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) {
 330                                 max_pix_clock = (lane_num * link_rates[i] * 8) / bpp;
 331                                 if (max_pix_clock >= pix_clock) {
 332                                         *dp_lanes = lane_num;
 333                                         *dp_rate = link_rates[i];
 334                                         return 0;
 335                                 }
 336                         }
 337                 }
 338         }
 339
 340         return -EINVAL;
 341 }
 342
 343 static u8 radeon_dp_encoder_service(struct radeon_device *rdev,
 344                                     int action, int dp_clock,
 345                                     u8 ucconfig, u8 lane_num)
 346 {
 347         DP_ENCODER_SERVICE_PARAMETERS args;
 348         int index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
 349
 350         memset(&args, 0, sizeof(args));
 351         args.ucLinkClock = dp_clock / 10;
 352         args.ucConfig = ucconfig;
 353         args.ucAction = action;
 354         args.ucLaneNum = lane_num;
 355         args.ucStatus = 0;
 356
 357         atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
 358         return args.ucStatus;
 359 }
 360
 361 u8 radeon_dp_getsinktype(struct radeon_connector *radeon_connector)
 362 {
 363         struct drm_device *dev = radeon_connector->base.dev;
 364         struct radeon_device *rdev = dev->dev_private;
 365
 366         return radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_GET_SINK_TYPE, 0,
 367                                          radeon_connector->ddc_bus->rec.i2c_id, 0);
 368 }
 369
 370 static void radeon_dp_probe_oui(struct radeon_connector *radeon_connector)
 371 {
 372         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 373         u8 buf[3];
 374
 375         if (!(dig_connector->dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT))
 376                 return;
 377
 378         if (drm_dp_dpcd_read(&radeon_connector->ddc_bus->aux, DP_SINK_OUI, buf, 3) == 3)
 379                 DRM_DEBUG_KMS("Sink OUI: %02hx%02hx%02hx\n",
 380                               buf[0], buf[1], buf[2]);
 381
 382         if (drm_dp_dpcd_read(&radeon_connector->ddc_bus->aux, DP_BRANCH_OUI, buf, 3) == 3)
 383                 DRM_DEBUG_KMS("Branch OUI: %02hx%02hx%02hx\n",
 384                               buf[0], buf[1], buf[2]);
 385 }
 386
 387 bool radeon_dp_getdpcd(struct radeon_connector *radeon_connector)
 388 {
 389         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 390         u8 msg[DP_DPCD_SIZE];
 391         int ret;
 392
 393         ret = drm_dp_dpcd_read(&radeon_connector->ddc_bus->aux, DP_DPCD_REV, msg,
 394                                DP_DPCD_SIZE);
 395         if (ret == DP_DPCD_SIZE) {
 396                 memcpy(dig_connector->dpcd, msg, DP_DPCD_SIZE);
 397
 398                 DRM_DEBUG_KMS("DPCD: %*ph\n", (int)sizeof(dig_connector->dpcd),
 399                               dig_connector->dpcd);
 400
 401                 radeon_dp_probe_oui(radeon_connector);
 402
 403                 return true;
 404         }
 405
 406         dig_connector->dpcd[0] = 0;
 407         return false;
 408 }
 409
 410 int radeon_dp_get_panel_mode(struct drm_encoder *encoder,
 411                              struct drm_connector *connector)
 412 {
 413         struct drm_device *dev = encoder->dev;
 414         struct radeon_device *rdev = dev->dev_private;
 415         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 416         int panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
 417         u16 dp_bridge = radeon_connector_encoder_get_dp_bridge_encoder_id(connector);
 418         u8 tmp;
 419
 420         if (!ASIC_IS_DCE4(rdev))
 421                 return panel_mode;
 422
 423         if (!radeon_connector->con_priv)
 424                 return panel_mode;
 425
 426         if (dp_bridge != ENCODER_OBJECT_ID_NONE) {
 427                 /* DP bridge chips */
 428                 if (drm_dp_dpcd_readb(&radeon_connector->ddc_bus->aux,
 429                                       DP_EDP_CONFIGURATION_CAP, &tmp) == 1) {
 430                         if (tmp & 1)
 431                                 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
 432                         else if ((dp_bridge == ENCODER_OBJECT_ID_NUTMEG) ||
 433                                  (dp_bridge == ENCODER_OBJECT_ID_TRAVIS))
 434                                 panel_mode = DP_PANEL_MODE_INTERNAL_DP1_MODE;
 435                         else
 436                                 panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
 437                 }
 438         } else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
 439                 /* eDP */
 440                 if (drm_dp_dpcd_readb(&radeon_connector->ddc_bus->aux,
 441                                       DP_EDP_CONFIGURATION_CAP, &tmp) == 1) {
 442                         if (tmp & 1)
 443                                 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
 444                 }
 445         }
 446
 447         return panel_mode;
 448 }
 449
 450 void radeon_dp_set_link_config(struct drm_connector *connector,
 451                                const struct drm_display_mode *mode)
 452 {
 453         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 454         struct radeon_connector_atom_dig *dig_connector;
 455         int ret;
 456
 457         if (!radeon_connector->con_priv)
 458                 return;
 459         dig_connector = radeon_connector->con_priv;
 460
 461         if ((dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) ||
 462             (dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_eDP)) {
 463                 ret = radeon_dp_get_dp_link_config(connector, dig_connector->dpcd,
 464                                                    mode->clock,
 465                                                    &dig_connector->dp_lane_count,
 466                                                    &dig_connector->dp_clock);
 467                 if (ret) {
 468                         dig_connector->dp_clock = 0;
 469                         dig_connector->dp_lane_count = 0;
 470                 }
 471         }
 472 }
 473
 474 int radeon_dp_mode_valid_helper(struct drm_connector *connector,
 475                                 struct drm_display_mode *mode)
 476 {
 477         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 478         struct radeon_connector_atom_dig *dig_connector;
 479         unsigned dp_clock, dp_lanes;
 480         int ret;
 481
 482         if ((mode->clock > 340000) &&
 483             (!radeon_connector_is_dp12_capable(connector)))
 484                 return MODE_CLOCK_HIGH;
 485
 486         if (!radeon_connector->con_priv)
 487                 return MODE_CLOCK_HIGH;
 488         dig_connector = radeon_connector->con_priv;
 489
 490         ret = radeon_dp_get_dp_link_config(connector, dig_connector->dpcd,
 491                                            mode->clock,
 492                                            &dp_lanes,
 493                                            &dp_clock);
 494         if (ret)
 495                 return MODE_CLOCK_HIGH;
 496
 497         if ((dp_clock == 540000) &&
 498             (!radeon_connector_is_dp12_capable(connector)))
 499                 return MODE_CLOCK_HIGH;
 500
 501         return MODE_OK;
 502 }
 503
 504 bool radeon_dp_needs_link_train(struct radeon_connector *radeon_connector)
 505 {
 506         u8 link_status[DP_LINK_STATUS_SIZE];
 507         struct radeon_connector_atom_dig *dig = radeon_connector->con_priv;
 508
 509         if (drm_dp_dpcd_read_link_status(&radeon_connector->ddc_bus->aux, link_status)
 510             <= 0)
 511                 return false;
 512         if (drm_dp_channel_eq_ok(link_status, dig->dp_lane_count))
 513                 return false;
 514         return true;
 515 }
 516
 517 void radeon_dp_set_rx_power_state(struct drm_connector *connector,
 518                                   u8 power_state)
 519 {
 520         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 521         struct radeon_connector_atom_dig *dig_connector;
 522
 523         if (!radeon_connector->con_priv)
 524                 return;
 525
 526         dig_connector = radeon_connector->con_priv;
 527
 528         /* power up/down the sink */
 529         if (dig_connector->dpcd[0] >= 0x11) {
 530                 drm_dp_dpcd_writeb(&radeon_connector->ddc_bus->aux,
 531                                    DP_SET_POWER, power_state);
 532                 usleep_range(1000, 2000);
 533         }
 534 }
 535
 536
 537 struct radeon_dp_link_train_info {
 538         struct radeon_device *rdev;
 539         struct drm_encoder *encoder;
 540         struct drm_connector *connector;
 541         int enc_id;
 542         int dp_clock;
 543         int dp_lane_count;
 544         bool tp3_supported;
 545         u8 dpcd[DP_RECEIVER_CAP_SIZE];
 546         u8 train_set[4];
 547         u8 link_status[DP_LINK_STATUS_SIZE];
 548         u8 tries;
 549         bool use_dpencoder;
 550         struct drm_dp_aux *aux;
 551 };
 552
 553 static void radeon_dp_update_vs_emph(struct radeon_dp_link_train_info *dp_info)
 554 {
 555         /* set the initial vs/emph on the source */
 556         atombios_dig_transmitter_setup(dp_info->encoder,
 557                                        ATOM_TRANSMITTER_ACTION_SETUP_VSEMPH,
 558                                        0, dp_info->train_set[0]); /* sets all lanes at once */
 559
 560         /* set the vs/emph on the sink */
 561         drm_dp_dpcd_write(dp_info->aux, DP_TRAINING_LANE0_SET,
 562                           dp_info->train_set, dp_info->dp_lane_count);
 563 }
 564
 565 static void radeon_dp_set_tp(struct radeon_dp_link_train_info *dp_info, int tp)
 566 {
 567         int rtp = 0;
 568
 569         /* set training pattern on the source */
 570         if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder) {
 571                 switch (tp) {
 572                 case DP_TRAINING_PATTERN_1:
 573                         rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN1;
 574                         break;
 575                 case DP_TRAINING_PATTERN_2:
 576                         rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN2;
 577                         break;
 578                 case DP_TRAINING_PATTERN_3:
 579                         rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN3;
 580                         break;
 581                 }
 582                 atombios_dig_encoder_setup(dp_info->encoder, rtp, 0);
 583         } else {
 584                 switch (tp) {
 585                 case DP_TRAINING_PATTERN_1:
 586                         rtp = 0;
 587                         break;
 588                 case DP_TRAINING_PATTERN_2:
 589                         rtp = 1;
 590                         break;
 591                 }
 592                 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_PATTERN_SEL,
 593                                           dp_info->dp_clock, dp_info->enc_id, rtp);
 594         }
 595
 596         /* enable training pattern on the sink */
 597         drm_dp_dpcd_writeb(dp_info->aux, DP_TRAINING_PATTERN_SET, tp);
 598 }
 599
 600 static int radeon_dp_link_train_init(struct radeon_dp_link_train_info *dp_info)
 601 {
 602         struct radeon_encoder *radeon_encoder = to_radeon_encoder(dp_info->encoder);
 603         struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
 604         u8 tmp;
 605
 606         /* power up the sink */
 607         radeon_dp_set_rx_power_state(dp_info->connector, DP_SET_POWER_D0);
 608
 609         /* possibly enable downspread on the sink */
 610         if (dp_info->dpcd[3] & 0x1)
 611                 drm_dp_dpcd_writeb(dp_info->aux,
 612                                    DP_DOWNSPREAD_CTRL, DP_SPREAD_AMP_0_5);
 613         else
 614                 drm_dp_dpcd_writeb(dp_info->aux,
 615                                    DP_DOWNSPREAD_CTRL, 0);
 616
 617         if (dig->panel_mode == DP_PANEL_MODE_INTERNAL_DP2_MODE)
 618                 drm_dp_dpcd_writeb(dp_info->aux, DP_EDP_CONFIGURATION_SET, 1);
 619
 620         /* set the lane count on the sink */
 621         tmp = dp_info->dp_lane_count;
 622         if (drm_dp_enhanced_frame_cap(dp_info->dpcd))
 623                 tmp |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
 624         drm_dp_dpcd_writeb(dp_info->aux, DP_LANE_COUNT_SET, tmp);
 625
 626         /* set the link rate on the sink */
 627         tmp = drm_dp_link_rate_to_bw_code(dp_info->dp_clock);
 628         drm_dp_dpcd_writeb(dp_info->aux, DP_LINK_BW_SET, tmp);
 629
 630         /* start training on the source */
 631         if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder)
 632                 atombios_dig_encoder_setup(dp_info->encoder,
 633                                            ATOM_ENCODER_CMD_DP_LINK_TRAINING_START, 0);
 634         else
 635                 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_START,
 636                                           dp_info->dp_clock, dp_info->enc_id, 0);
 637
 638         /* disable the training pattern on the sink */
 639         drm_dp_dpcd_writeb(dp_info->aux,
 640                            DP_TRAINING_PATTERN_SET,
 641                            DP_TRAINING_PATTERN_DISABLE);
 642
 643         return 0;
 644 }
 645
 646 static int radeon_dp_link_train_finish(struct radeon_dp_link_train_info *dp_info)
 647 {
 648         udelay(400);
 649
 650         /* disable the training pattern on the sink */
 651         drm_dp_dpcd_writeb(dp_info->aux,
 652                            DP_TRAINING_PATTERN_SET,
 653                            DP_TRAINING_PATTERN_DISABLE);
 654
 655         /* disable the training pattern on the source */
 656         if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder)
 657                 atombios_dig_encoder_setup(dp_info->encoder,
 658                                            ATOM_ENCODER_CMD_DP_LINK_TRAINING_COMPLETE, 0);
 659         else
 660                 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_COMPLETE,
 661                                           dp_info->dp_clock, dp_info->enc_id, 0);
 662
 663         return 0;
 664 }
 665
 666 static int radeon_dp_link_train_cr(struct radeon_dp_link_train_info *dp_info)
 667 {
 668         bool clock_recovery;
 669         u8 voltage;
 670         int i;
 671
 672         radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_1);
 673         memset(dp_info->train_set, 0, 4);
 674         radeon_dp_update_vs_emph(dp_info);
 675
 676         udelay(400);
 677
 678         /* clock recovery loop */
 679         clock_recovery = false;
 680         dp_info->tries = 0;
 681         voltage = 0xff;
 682         while (1) {
 683                 drm_dp_link_train_clock_recovery_delay(dp_info->aux, dp_info->dpcd);
 684
 685                 if (drm_dp_dpcd_read_link_status(dp_info->aux,
 686                                                  dp_info->link_status) <= 0) {
 687                         DRM_ERROR("displayport link status failed\n");
 688                         break;
 689                 }
 690
 691                 if (drm_dp_clock_recovery_ok(dp_info->link_status, dp_info->dp_lane_count)) {
 692                         clock_recovery = true;
 693                         break;
 694                 }
 695
 696                 for (i = 0; i < dp_info->dp_lane_count; i++) {
 697                         if ((dp_info->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
 698                                 break;
 699                 }
 700                 if (i == dp_info->dp_lane_count) {
 701                         DRM_ERROR("clock recovery reached max voltage\n");
 702                         break;
 703                 }
 704
 705                 if ((dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
 706                         ++dp_info->tries;
 707                         if (dp_info->tries == 5) {
 708                                 DRM_ERROR("clock recovery tried 5 times\n");
 709                                 break;
 710                         }
 711                 } else
 712                         dp_info->tries = 0;
 713
 714                 voltage = dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
 715
 716                 /* Compute new train_set as requested by sink */
 717                 dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, dp_info->train_set);
 718
 719                 radeon_dp_update_vs_emph(dp_info);
 720         }
 721         if (!clock_recovery) {
 722                 DRM_ERROR("clock recovery failed\n");
 723                 return -1;
 724         } else {
 725                 DRM_DEBUG_KMS("clock recovery at voltage %d pre-emphasis %d\n",
 726                           dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
 727                           (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) >>
 728                           DP_TRAIN_PRE_EMPHASIS_SHIFT);
 729                 return 0;
 730         }
 731 }
 732
 733 static int radeon_dp_link_train_ce(struct radeon_dp_link_train_info *dp_info)
 734 {
 735         bool channel_eq;
 736
 737         if (dp_info->tp3_supported)
 738                 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_3);
 739         else
 740                 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_2);
 741
 742         /* channel equalization loop */
 743         dp_info->tries = 0;
 744         channel_eq = false;
 745         while (1) {
 746                 drm_dp_link_train_channel_eq_delay(dp_info->aux, dp_info->dpcd);
 747
 748                 if (drm_dp_dpcd_read_link_status(dp_info->aux,
 749                                                  dp_info->link_status) <= 0) {
 750                         DRM_ERROR("displayport link status failed\n");
 751                         break;
 752                 }
 753
 754                 if (drm_dp_channel_eq_ok(dp_info->link_status, dp_info->dp_lane_count)) {
 755                         channel_eq = true;
 756                         break;
 757                 }
 758
 759                 /* Try 5 times */
 760                 if (dp_info->tries > 5) {
 761                         DRM_ERROR("channel eq failed: 5 tries\n");
 762                         break;
 763                 }
 764
 765                 /* Compute new train_set as requested by sink */
 766                 dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, dp_info->train_set);
 767
 768                 radeon_dp_update_vs_emph(dp_info);
 769                 dp_info->tries++;
 770         }
 771
 772         if (!channel_eq) {
 773                 DRM_ERROR("channel eq failed\n");
 774                 return -1;
 775         } else {
 776                 DRM_DEBUG_KMS("channel eq at voltage %d pre-emphasis %d\n",
 777                           dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
 778                           (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK)
 779                           >> DP_TRAIN_PRE_EMPHASIS_SHIFT);
 780                 return 0;
 781         }
 782 }
 783
 784 void radeon_dp_link_train(struct drm_encoder *encoder,
 785                           struct drm_connector *connector)
 786 {
 787         struct drm_device *dev = encoder->dev;
 788         struct radeon_device *rdev = dev->dev_private;
 789         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 790         struct radeon_encoder_atom_dig *dig;
 791         struct radeon_connector *radeon_connector;
 792         struct radeon_connector_atom_dig *dig_connector;
 793         struct radeon_dp_link_train_info dp_info;
 794         int index;
 795         u8 tmp, frev, crev;
 796
 797         if (!radeon_encoder->enc_priv)
 798                 return;
 799         dig = radeon_encoder->enc_priv;
 800
 801         radeon_connector = to_radeon_connector(connector);
 802         if (!radeon_connector->con_priv)
 803                 return;
 804         dig_connector = radeon_connector->con_priv;
 805
 806         if ((dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_DISPLAYPORT) &&
 807             (dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_eDP))
 808                 return;
 809
 810         /* DPEncoderService newer than 1.1 can't program properly the
 811          * training pattern. When facing such version use the
 812          * DIGXEncoderControl (X== 1 | 2)
 813          */
 814         dp_info.use_dpencoder = true;
 815         index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
 816         if (atom_parse_cmd_header(rdev->mode_info.atom_context, index, &frev, &crev)) {
 817                 if (crev > 1)
 818                         dp_info.use_dpencoder = false;
 819         }
 820
 821         dp_info.enc_id = 0;
 822         if (dig->dig_encoder)
 823                 dp_info.enc_id |= ATOM_DP_CONFIG_DIG2_ENCODER;
 824         else
 825                 dp_info.enc_id |= ATOM_DP_CONFIG_DIG1_ENCODER;
 826         if (dig->linkb)
 827                 dp_info.enc_id |= ATOM_DP_CONFIG_LINK_B;
 828         else
 829                 dp_info.enc_id |= ATOM_DP_CONFIG_LINK_A;
 830
 831         if (drm_dp_dpcd_readb(&radeon_connector->ddc_bus->aux, DP_MAX_LANE_COUNT, &tmp)
 832             == 1) {
 833                 if (ASIC_IS_DCE5(rdev) && (tmp & DP_TPS3_SUPPORTED))
 834                         dp_info.tp3_supported = true;
 835                 else
 836                         dp_info.tp3_supported = false;
 837         } else {
 838                 dp_info.tp3_supported = false;
 839         }
 840
 841         memcpy(dp_info.dpcd, dig_connector->dpcd, DP_RECEIVER_CAP_SIZE);
 842         dp_info.rdev = rdev;
 843         dp_info.encoder = encoder;
 844         dp_info.connector = connector;
 845         dp_info.dp_lane_count = dig_connector->dp_lane_count;
 846         dp_info.dp_clock = dig_connector->dp_clock;
 847         dp_info.aux = &radeon_connector->ddc_bus->aux;
 848
 849         if (radeon_dp_link_train_init(&dp_info))
 850                 goto done;
 851         if (radeon_dp_link_train_cr(&dp_info))
 852                 goto done;
 853         if (radeon_dp_link_train_ce(&dp_info))
 854                 goto done;
 855 done:
 856         if (radeon_dp_link_train_finish(&dp_info))
 857                 return;
 858 }