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_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
  49  * so swap as appropriate when copying data to
  50  * or from atom. Note that atom operates on
  51  * dw units.
  52  */
  53 void radeon_atom_copy_swap(u8 *dst, u8 *src, u8 num_bytes, bool to_le)
  54 {
  55 #ifdef __BIG_ENDIAN
  56         u8 src_tmp[20], dst_tmp[20]; /* used for byteswapping */
  57         u32 *dst32, *src32;
  58         int i;
  59
  60         memcpy(src_tmp, src, num_bytes);
  61         src32 = (u32 *)src_tmp;
  62         dst32 = (u32 *)dst_tmp;
  63         if (to_le) {
  64                 for (i = 0; i < ((num_bytes + 3) / 4); i++)
  65                         dst32[i] = cpu_to_le32(src32[i]);
  66                 memcpy(dst, dst_tmp, num_bytes);
  67         } else {
  68                 u8 dws = num_bytes & ~3;
  69                 for (i = 0; i < ((num_bytes + 3) / 4); i++)
  70                         dst32[i] = le32_to_cpu(src32[i]);
  71                 memcpy(dst, dst_tmp, dws);
  72                 if (num_bytes % 4) {
  73                         for (i = 0; i < (num_bytes % 4); i++)
  74                                 dst[dws+i] = dst_tmp[dws+i];
  75                 }
  76         }
  77 #else
  78         memcpy(dst, src, num_bytes);
  79 #endif
  80 }
  81
  82 union aux_channel_transaction {
  83         PROCESS_AUX_CHANNEL_TRANSACTION_PS_ALLOCATION v1;
  84         PROCESS_AUX_CHANNEL_TRANSACTION_PARAMETERS_V2 v2;
  85 };
  86
  87 static int radeon_process_aux_ch(struct radeon_i2c_chan *chan,
  88                                  u8 *send, int send_bytes,
  89                                  u8 *recv, int recv_size,
  90                                  u8 delay, u8 *ack)
  91 {
  92         struct drm_device *dev = chan->dev;
  93         struct radeon_device *rdev = dev->dev_private;
  94         union aux_channel_transaction args;
  95         int index = GetIndexIntoMasterTable(COMMAND, ProcessAuxChannelTransaction);
  96         unsigned char *base;
  97         int recv_bytes;
  98
  99         memset(&args, 0, sizeof(args));
 100
 101         base = (unsigned char *)(rdev->mode_info.atom_context->scratch + 1);
 102
 103         radeon_atom_copy_swap(base, send, send_bytes, true);
 104
 105         args.v1.lpAuxRequest = cpu_to_le16((u16)(0 + 4));
 106         args.v1.lpDataOut = cpu_to_le16((u16)(16 + 4));
 107         args.v1.ucDataOutLen = 0;
 108         args.v1.ucChannelID = chan->rec.i2c_id;
 109         args.v1.ucDelay = delay / 10;
 110         if (ASIC_IS_DCE4(rdev))
 111                 args.v2.ucHPD_ID = chan->rec.hpd;
 112
 113         atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
 114
 115         *ack = args.v1.ucReplyStatus;
 116
 117         /* timeout */
 118         if (args.v1.ucReplyStatus == 1) {
 119                 DRM_DEBUG_KMS("dp_aux_ch timeout\n");
 120                 return -ETIMEDOUT;
 121         }
 122
 123         /* flags not zero */
 124         if (args.v1.ucReplyStatus == 2) {
 125                 DRM_DEBUG_KMS("dp_aux_ch flags not zero\n");
 126                 return -EBUSY;
 127         }
 128
 129         /* error */
 130         if (args.v1.ucReplyStatus == 3) {
 131                 DRM_DEBUG_KMS("dp_aux_ch error\n");
 132                 return -EIO;
 133         }
 134
 135         recv_bytes = args.v1.ucDataOutLen;
 136         if (recv_bytes > recv_size)
 137                 recv_bytes = recv_size;
 138
 139         if (recv && recv_size)
 140                 radeon_atom_copy_swap(recv, base + 16, recv_bytes, false);
 141
 142         return recv_bytes;
 143 }
 144
 145 #define BARE_ADDRESS_SIZE 3
 146 #define HEADER_SIZE (BARE_ADDRESS_SIZE + 1)
 147
 148 static ssize_t
 149 radeon_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
 150 {
 151         struct radeon_i2c_chan *chan =
 152                 container_of(aux, struct radeon_i2c_chan, aux);
 153         int ret;
 154         u8 tx_buf[20];
 155         size_t tx_size;
 156         u8 ack, delay = 0;
 157
 158         if (WARN_ON(msg->size > 16))
 159                 return -E2BIG;
 160
 161         tx_buf[0] = msg->address & 0xff;
 162         tx_buf[1] = msg->address >> 8;
 163         tx_buf[2] = msg->request << 4;
 164         tx_buf[3] = msg->size ? (msg->size - 1) : 0;
 165
 166         switch (msg->request & ~DP_AUX_I2C_MOT) {
 167         case DP_AUX_NATIVE_WRITE:
 168         case DP_AUX_I2C_WRITE:
 169                 /* tx_size needs to be 4 even for bare address packets since the atom
 170                  * table needs the info in tx_buf[3].
 171                  */
 172                 tx_size = HEADER_SIZE + msg->size;
 173                 if (msg->size == 0)
 174                         tx_buf[3] |= BARE_ADDRESS_SIZE << 4;
 175                 else
 176                         tx_buf[3] |= tx_size << 4;
 177                 memcpy(tx_buf + HEADER_SIZE, msg->buffer, msg->size);
 178                 ret = radeon_process_aux_ch(chan,
 179                                             tx_buf, tx_size, NULL, 0, delay, &ack);
 180                 if (ret >= 0)
 181                         /* Return payload size. */
 182                         ret = msg->size;
 183                 break;
 184         case DP_AUX_NATIVE_READ:
 185         case DP_AUX_I2C_READ:
 186                 /* tx_size needs to be 4 even for bare address packets since the atom
 187                  * table needs the info in tx_buf[3].
 188                  */
 189                 tx_size = HEADER_SIZE;
 190                 if (msg->size == 0)
 191                         tx_buf[3] |= BARE_ADDRESS_SIZE << 4;
 192                 else
 193                         tx_buf[3] |= tx_size << 4;
 194                 ret = radeon_process_aux_ch(chan,
 195                                             tx_buf, tx_size, msg->buffer, msg->size, delay, &ack);
 196                 break;
 197         default:
 198                 ret = -EINVAL;
 199                 break;
 200         }
 201
 202         if (ret >= 0)
 203                 msg->reply = ack >> 4;
 204
 205         return ret;
 206 }
 207
 208 void radeon_dp_aux_init(struct radeon_connector *radeon_connector)
 209 {
 210         int ret;
 211
 212         radeon_connector->ddc_bus->rec.hpd = radeon_connector->hpd.hpd;
 213         radeon_connector->ddc_bus->aux.dev = radeon_connector->base.kdev;
 214         radeon_connector->ddc_bus->aux.transfer = radeon_dp_aux_transfer;
 215         ret = drm_dp_aux_register_i2c_bus(&radeon_connector->ddc_bus->aux);
 216         if (!ret)
 217                 radeon_connector->ddc_bus->has_aux = true;
 218
 219         WARN(ret, "drm_dp_aux_register_i2c_bus() failed with error %d\n", ret);
 220 }
 221
 222 /***** general DP utility functions *****/
 223
 224 #define DP_VOLTAGE_MAX         DP_TRAIN_VOLTAGE_SWING_1200
 225 #define DP_PRE_EMPHASIS_MAX    DP_TRAIN_PRE_EMPHASIS_9_5
 226
 227 static void dp_get_adjust_train(u8 link_status[DP_LINK_STATUS_SIZE],
 228                                 int lane_count,
 229                                 u8 train_set[4])
 230 {
 231         u8 v = 0;
 232         u8 p = 0;
 233         int lane;
 234
 235         for (lane = 0; lane < lane_count; lane++) {
 236                 u8 this_v = drm_dp_get_adjust_request_voltage(link_status, lane);
 237                 u8 this_p = drm_dp_get_adjust_request_pre_emphasis(link_status, lane);
 238
 239                 DRM_DEBUG_KMS("requested signal parameters: lane %d voltage %s pre_emph %s\n",
 240                           lane,
 241                           voltage_names[this_v >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
 242                           pre_emph_names[this_p >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
 243
 244                 if (this_v > v)
 245                         v = this_v;
 246                 if (this_p > p)
 247                         p = this_p;
 248         }
 249
 250         if (v >= DP_VOLTAGE_MAX)
 251                 v |= DP_TRAIN_MAX_SWING_REACHED;
 252
 253         if (p >= DP_PRE_EMPHASIS_MAX)
 254                 p |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
 255
 256         DRM_DEBUG_KMS("using signal parameters: voltage %s pre_emph %s\n",
 257                   voltage_names[(v & DP_TRAIN_VOLTAGE_SWING_MASK) >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
 258                   pre_emph_names[(p & DP_TRAIN_PRE_EMPHASIS_MASK) >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
 259
 260         for (lane = 0; lane < 4; lane++)
 261                 train_set[lane] = v | p;
 262 }
 263
 264 /* convert bits per color to bits per pixel */
 265 /* get bpc from the EDID */
 266 static int convert_bpc_to_bpp(int bpc)
 267 {
 268         if (bpc == 0)
 269                 return 24;
 270         else
 271                 return bpc * 3;
 272 }
 273
 274 /* get the max pix clock supported by the link rate and lane num */
 275 static int dp_get_max_dp_pix_clock(int link_rate,
 276                                    int lane_num,
 277                                    int bpp)
 278 {
 279         return (link_rate * lane_num * 8) / bpp;
 280 }
 281
 282 /***** radeon specific DP functions *****/
 283
 284 /* First get the min lane# when low rate is used according to pixel clock
 285  * (prefer low rate), second check max lane# supported by DP panel,
 286  * if the max lane# < low rate lane# then use max lane# instead.
 287  */
 288 static int radeon_dp_get_dp_lane_number(struct drm_connector *connector,
 289                                         u8 dpcd[DP_DPCD_SIZE],
 290                                         int pix_clock)
 291 {
 292         int bpp = convert_bpc_to_bpp(radeon_get_monitor_bpc(connector));
 293         int max_link_rate = drm_dp_max_link_rate(dpcd);
 294         int max_lane_num = drm_dp_max_lane_count(dpcd);
 295         int lane_num;
 296         int max_dp_pix_clock;
 297
 298         for (lane_num = 1; lane_num < max_lane_num; lane_num <<= 1) {
 299                 max_dp_pix_clock = dp_get_max_dp_pix_clock(max_link_rate, lane_num, bpp);
 300                 if (pix_clock <= max_dp_pix_clock)
 301                         break;
 302         }
 303
 304         return lane_num;
 305 }
 306
 307 static int radeon_dp_get_dp_link_clock(struct drm_connector *connector,
 308                                        u8 dpcd[DP_DPCD_SIZE],
 309                                        int pix_clock)
 310 {
 311         int bpp = convert_bpc_to_bpp(radeon_get_monitor_bpc(connector));
 312         int lane_num, max_pix_clock;
 313
 314         if (radeon_connector_encoder_get_dp_bridge_encoder_id(connector) ==
 315             ENCODER_OBJECT_ID_NUTMEG)
 316                 return 270000;
 317
 318         lane_num = radeon_dp_get_dp_lane_number(connector, dpcd, pix_clock);
 319         max_pix_clock = dp_get_max_dp_pix_clock(162000, lane_num, bpp);
 320         if (pix_clock <= max_pix_clock)
 321                 return 162000;
 322         max_pix_clock = dp_get_max_dp_pix_clock(270000, lane_num, bpp);
 323         if (pix_clock <= max_pix_clock)
 324                 return 270000;
 325         if (radeon_connector_is_dp12_capable(connector)) {
 326                 max_pix_clock = dp_get_max_dp_pix_clock(540000, lane_num, bpp);
 327                 if (pix_clock <= max_pix_clock)
 328                         return 540000;
 329         }
 330
 331         return drm_dp_max_link_rate(dpcd);
 332 }
 333
 334 static u8 radeon_dp_encoder_service(struct radeon_device *rdev,
 335                                     int action, int dp_clock,
 336                                     u8 ucconfig, u8 lane_num)
 337 {
 338         DP_ENCODER_SERVICE_PARAMETERS args;
 339         int index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
 340
 341         memset(&args, 0, sizeof(args));
 342         args.ucLinkClock = dp_clock / 10;
 343         args.ucConfig = ucconfig;
 344         args.ucAction = action;
 345         args.ucLaneNum = lane_num;
 346         args.ucStatus = 0;
 347
 348         atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
 349         return args.ucStatus;
 350 }
 351
 352 u8 radeon_dp_getsinktype(struct radeon_connector *radeon_connector)
 353 {
 354         struct drm_device *dev = radeon_connector->base.dev;
 355         struct radeon_device *rdev = dev->dev_private;
 356
 357         return radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_GET_SINK_TYPE, 0,
 358                                          radeon_connector->ddc_bus->rec.i2c_id, 0);
 359 }
 360
 361 static void radeon_dp_probe_oui(struct radeon_connector *radeon_connector)
 362 {
 363         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 364         u8 buf[3];
 365
 366         if (!(dig_connector->dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT))
 367                 return;
 368
 369         if (drm_dp_dpcd_read(&radeon_connector->ddc_bus->aux, DP_SINK_OUI, buf, 3) == 3)
 370                 DRM_DEBUG_KMS("Sink OUI: %02hx%02hx%02hx\n",
 371                               buf[0], buf[1], buf[2]);
 372
 373         if (drm_dp_dpcd_read(&radeon_connector->ddc_bus->aux, DP_BRANCH_OUI, buf, 3) == 3)
 374                 DRM_DEBUG_KMS("Branch OUI: %02hx%02hx%02hx\n",
 375                               buf[0], buf[1], buf[2]);
 376 }
 377
 378 bool radeon_dp_getdpcd(struct radeon_connector *radeon_connector)
 379 {
 380         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 381         u8 msg[DP_DPCD_SIZE];
 382         int ret, i;
 383
 384         ret = drm_dp_dpcd_read(&radeon_connector->ddc_bus->aux, DP_DPCD_REV, msg,
 385                                DP_DPCD_SIZE);
 386         if (ret > 0) {
 387                 memcpy(dig_connector->dpcd, msg, DP_DPCD_SIZE);
 388                 DRM_DEBUG_KMS("DPCD: ");
 389                 for (i = 0; i < DP_DPCD_SIZE; i++)
 390                         DRM_DEBUG_KMS("%02x ", msg[i]);
 391                 DRM_DEBUG_KMS("\n");
 392
 393                 radeon_dp_probe_oui(radeon_connector);
 394
 395                 return true;
 396         }
 397         dig_connector->dpcd[0] = 0;
 398         return false;
 399 }
 400
 401 int radeon_dp_get_panel_mode(struct drm_encoder *encoder,
 402                              struct drm_connector *connector)
 403 {
 404         struct drm_device *dev = encoder->dev;
 405         struct radeon_device *rdev = dev->dev_private;
 406         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 407         struct radeon_connector_atom_dig *dig_connector;
 408         int panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
 409         u16 dp_bridge = radeon_connector_encoder_get_dp_bridge_encoder_id(connector);
 410         u8 tmp;
 411
 412         if (!ASIC_IS_DCE4(rdev))
 413                 return panel_mode;
 414
 415         if (!radeon_connector->con_priv)
 416                 return panel_mode;
 417
 418         dig_connector = radeon_connector->con_priv;
 419
 420         if (dp_bridge != ENCODER_OBJECT_ID_NONE) {
 421                 /* DP bridge chips */
 422                 if (drm_dp_dpcd_readb(&radeon_connector->ddc_bus->aux,
 423                                       DP_EDP_CONFIGURATION_CAP, &tmp) == 1) {
 424                         if (tmp & 1)
 425                                 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
 426                         else if ((dp_bridge == ENCODER_OBJECT_ID_NUTMEG) ||
 427                                  (dp_bridge == ENCODER_OBJECT_ID_TRAVIS))
 428                                 panel_mode = DP_PANEL_MODE_INTERNAL_DP1_MODE;
 429                         else
 430                                 panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
 431                 }
 432         } else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
 433                 /* eDP */
 434                 if (drm_dp_dpcd_readb(&radeon_connector->ddc_bus->aux,
 435                                       DP_EDP_CONFIGURATION_CAP, &tmp) == 1) {
 436                         if (tmp & 1)
 437                                 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
 438                 }
 439         }
 440
 441         return panel_mode;
 442 }
 443
 444 void radeon_dp_set_link_config(struct drm_connector *connector,
 445                                const struct drm_display_mode *mode)
 446 {
 447         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 448         struct radeon_connector_atom_dig *dig_connector;
 449
 450         if (!radeon_connector->con_priv)
 451                 return;
 452         dig_connector = radeon_connector->con_priv;
 453
 454         if ((dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) ||
 455             (dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_eDP)) {
 456                 dig_connector->dp_clock =
 457                         radeon_dp_get_dp_link_clock(connector, dig_connector->dpcd, mode->clock);
 458                 dig_connector->dp_lane_count =
 459                         radeon_dp_get_dp_lane_number(connector, dig_connector->dpcd, mode->clock);
 460         }
 461 }
 462
 463 int radeon_dp_mode_valid_helper(struct drm_connector *connector,
 464                                 struct drm_display_mode *mode)
 465 {
 466         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 467         struct radeon_connector_atom_dig *dig_connector;
 468         int dp_clock;
 469
 470         if (!radeon_connector->con_priv)
 471                 return MODE_CLOCK_HIGH;
 472         dig_connector = radeon_connector->con_priv;
 473
 474         dp_clock =
 475                 radeon_dp_get_dp_link_clock(connector, dig_connector->dpcd, mode->clock);
 476
 477         if ((dp_clock == 540000) &&
 478             (!radeon_connector_is_dp12_capable(connector)))
 479                 return MODE_CLOCK_HIGH;
 480
 481         return MODE_OK;
 482 }
 483
 484 bool radeon_dp_needs_link_train(struct radeon_connector *radeon_connector)
 485 {
 486         u8 link_status[DP_LINK_STATUS_SIZE];
 487         struct radeon_connector_atom_dig *dig = radeon_connector->con_priv;
 488
 489         if (drm_dp_dpcd_read_link_status(&radeon_connector->ddc_bus->aux, link_status)
 490             <= 0)
 491                 return false;
 492         if (drm_dp_channel_eq_ok(link_status, dig->dp_lane_count))
 493                 return false;
 494         return true;
 495 }
 496
 497 void radeon_dp_set_rx_power_state(struct drm_connector *connector,
 498                                   u8 power_state)
 499 {
 500         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 501         struct radeon_connector_atom_dig *dig_connector;
 502
 503         if (!radeon_connector->con_priv)
 504                 return;
 505
 506         dig_connector = radeon_connector->con_priv;
 507
 508         /* power up/down the sink */
 509         if (dig_connector->dpcd[0] >= 0x11) {
 510                 drm_dp_dpcd_writeb(&radeon_connector->ddc_bus->aux,
 511                                    DP_SET_POWER, power_state);
 512                 usleep_range(1000, 2000);
 513         }
 514 }
 515
 516
 517 struct radeon_dp_link_train_info {
 518         struct radeon_device *rdev;
 519         struct drm_encoder *encoder;
 520         struct drm_connector *connector;
 521         int enc_id;
 522         int dp_clock;
 523         int dp_lane_count;
 524         bool tp3_supported;
 525         u8 dpcd[DP_RECEIVER_CAP_SIZE];
 526         u8 train_set[4];
 527         u8 link_status[DP_LINK_STATUS_SIZE];
 528         u8 tries;
 529         bool use_dpencoder;
 530         struct drm_dp_aux *aux;
 531 };
 532
 533 static void radeon_dp_update_vs_emph(struct radeon_dp_link_train_info *dp_info)
 534 {
 535         /* set the initial vs/emph on the source */
 536         atombios_dig_transmitter_setup(dp_info->encoder,
 537                                        ATOM_TRANSMITTER_ACTION_SETUP_VSEMPH,
 538                                        0, dp_info->train_set[0]); /* sets all lanes at once */
 539
 540         /* set the vs/emph on the sink */
 541         drm_dp_dpcd_write(dp_info->aux, DP_TRAINING_LANE0_SET,
 542                           dp_info->train_set, dp_info->dp_lane_count);
 543 }
 544
 545 static void radeon_dp_set_tp(struct radeon_dp_link_train_info *dp_info, int tp)
 546 {
 547         int rtp = 0;
 548
 549         /* set training pattern on the source */
 550         if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder) {
 551                 switch (tp) {
 552                 case DP_TRAINING_PATTERN_1:
 553                         rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN1;
 554                         break;
 555                 case DP_TRAINING_PATTERN_2:
 556                         rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN2;
 557                         break;
 558                 case DP_TRAINING_PATTERN_3:
 559                         rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN3;
 560                         break;
 561                 }
 562                 atombios_dig_encoder_setup(dp_info->encoder, rtp, 0);
 563         } else {
 564                 switch (tp) {
 565                 case DP_TRAINING_PATTERN_1:
 566                         rtp = 0;
 567                         break;
 568                 case DP_TRAINING_PATTERN_2:
 569                         rtp = 1;
 570                         break;
 571                 }
 572                 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_PATTERN_SEL,
 573                                           dp_info->dp_clock, dp_info->enc_id, rtp);
 574         }
 575
 576         /* enable training pattern on the sink */
 577         drm_dp_dpcd_writeb(dp_info->aux, DP_TRAINING_PATTERN_SET, tp);
 578 }
 579
 580 static int radeon_dp_link_train_init(struct radeon_dp_link_train_info *dp_info)
 581 {
 582         struct radeon_encoder *radeon_encoder = to_radeon_encoder(dp_info->encoder);
 583         struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
 584         u8 tmp;
 585
 586         /* power up the sink */
 587         radeon_dp_set_rx_power_state(dp_info->connector, DP_SET_POWER_D0);
 588
 589         /* possibly enable downspread on the sink */
 590         if (dp_info->dpcd[3] & 0x1)
 591                 drm_dp_dpcd_writeb(dp_info->aux,
 592                                    DP_DOWNSPREAD_CTRL, DP_SPREAD_AMP_0_5);
 593         else
 594                 drm_dp_dpcd_writeb(dp_info->aux,
 595                                    DP_DOWNSPREAD_CTRL, 0);
 596
 597         if ((dp_info->connector->connector_type == DRM_MODE_CONNECTOR_eDP) &&
 598             (dig->panel_mode == DP_PANEL_MODE_INTERNAL_DP2_MODE)) {
 599                 drm_dp_dpcd_writeb(dp_info->aux, DP_EDP_CONFIGURATION_SET, 1);
 600         }
 601
 602         /* set the lane count on the sink */
 603         tmp = dp_info->dp_lane_count;
 604         if (drm_dp_enhanced_frame_cap(dp_info->dpcd))
 605                 tmp |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
 606         drm_dp_dpcd_writeb(dp_info->aux, DP_LANE_COUNT_SET, tmp);
 607
 608         /* set the link rate on the sink */
 609         tmp = drm_dp_link_rate_to_bw_code(dp_info->dp_clock);
 610         drm_dp_dpcd_writeb(dp_info->aux, DP_LINK_BW_SET, tmp);
 611
 612         /* start training on the source */
 613         if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder)
 614                 atombios_dig_encoder_setup(dp_info->encoder,
 615                                            ATOM_ENCODER_CMD_DP_LINK_TRAINING_START, 0);
 616         else
 617                 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_START,
 618                                           dp_info->dp_clock, dp_info->enc_id, 0);
 619
 620         /* disable the training pattern on the sink */
 621         drm_dp_dpcd_writeb(dp_info->aux,
 622                            DP_TRAINING_PATTERN_SET,
 623                            DP_TRAINING_PATTERN_DISABLE);
 624
 625         return 0;
 626 }
 627
 628 static int radeon_dp_link_train_finish(struct radeon_dp_link_train_info *dp_info)
 629 {
 630         udelay(400);
 631
 632         /* disable the training pattern on the sink */
 633         drm_dp_dpcd_writeb(dp_info->aux,
 634                            DP_TRAINING_PATTERN_SET,
 635                            DP_TRAINING_PATTERN_DISABLE);
 636
 637         /* disable the training pattern on the source */
 638         if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder)
 639                 atombios_dig_encoder_setup(dp_info->encoder,
 640                                            ATOM_ENCODER_CMD_DP_LINK_TRAINING_COMPLETE, 0);
 641         else
 642                 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_COMPLETE,
 643                                           dp_info->dp_clock, dp_info->enc_id, 0);
 644
 645         return 0;
 646 }
 647
 648 static int radeon_dp_link_train_cr(struct radeon_dp_link_train_info *dp_info)
 649 {
 650         bool clock_recovery;
 651         u8 voltage;
 652         int i;
 653
 654         radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_1);
 655         memset(dp_info->train_set, 0, 4);
 656         radeon_dp_update_vs_emph(dp_info);
 657
 658         udelay(400);
 659
 660         /* clock recovery loop */
 661         clock_recovery = false;
 662         dp_info->tries = 0;
 663         voltage = 0xff;
 664         while (1) {
 665                 drm_dp_link_train_clock_recovery_delay(dp_info->dpcd);
 666
 667                 if (drm_dp_dpcd_read_link_status(dp_info->aux,
 668                                                  dp_info->link_status) <= 0) {
 669                         DRM_ERROR("displayport link status failed\n");
 670                         break;
 671                 }
 672
 673                 if (drm_dp_clock_recovery_ok(dp_info->link_status, dp_info->dp_lane_count)) {
 674                         clock_recovery = true;
 675                         break;
 676                 }
 677
 678                 for (i = 0; i < dp_info->dp_lane_count; i++) {
 679                         if ((dp_info->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
 680                                 break;
 681                 }
 682                 if (i == dp_info->dp_lane_count) {
 683                         DRM_ERROR("clock recovery reached max voltage\n");
 684                         break;
 685                 }
 686
 687                 if ((dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
 688                         ++dp_info->tries;
 689                         if (dp_info->tries == 5) {
 690                                 DRM_ERROR("clock recovery tried 5 times\n");
 691                                 break;
 692                         }
 693                 } else
 694                         dp_info->tries = 0;
 695
 696                 voltage = dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
 697
 698                 /* Compute new train_set as requested by sink */
 699                 dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, dp_info->train_set);
 700
 701                 radeon_dp_update_vs_emph(dp_info);
 702         }
 703         if (!clock_recovery) {
 704                 DRM_ERROR("clock recovery failed\n");
 705                 return -1;
 706         } else {
 707                 DRM_DEBUG_KMS("clock recovery at voltage %d pre-emphasis %d\n",
 708                           dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
 709                           (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) >>
 710                           DP_TRAIN_PRE_EMPHASIS_SHIFT);
 711                 return 0;
 712         }
 713 }
 714
 715 static int radeon_dp_link_train_ce(struct radeon_dp_link_train_info *dp_info)
 716 {
 717         bool channel_eq;
 718
 719         if (dp_info->tp3_supported)
 720                 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_3);
 721         else
 722                 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_2);
 723
 724         /* channel equalization loop */
 725         dp_info->tries = 0;
 726         channel_eq = false;
 727         while (1) {
 728                 drm_dp_link_train_channel_eq_delay(dp_info->dpcd);
 729
 730                 if (drm_dp_dpcd_read_link_status(dp_info->aux,
 731                                                  dp_info->link_status) <= 0) {
 732                         DRM_ERROR("displayport link status failed\n");
 733                         break;
 734                 }
 735
 736                 if (drm_dp_channel_eq_ok(dp_info->link_status, dp_info->dp_lane_count)) {
 737                         channel_eq = true;
 738                         break;
 739                 }
 740
 741                 /* Try 5 times */
 742                 if (dp_info->tries > 5) {
 743                         DRM_ERROR("channel eq failed: 5 tries\n");
 744                         break;
 745                 }
 746
 747                 /* Compute new train_set as requested by sink */
 748                 dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, dp_info->train_set);
 749
 750                 radeon_dp_update_vs_emph(dp_info);
 751                 dp_info->tries++;
 752         }
 753
 754         if (!channel_eq) {
 755                 DRM_ERROR("channel eq failed\n");
 756                 return -1;
 757         } else {
 758                 DRM_DEBUG_KMS("channel eq at voltage %d pre-emphasis %d\n",
 759                           dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
 760                           (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK)
 761                           >> DP_TRAIN_PRE_EMPHASIS_SHIFT);
 762                 return 0;
 763         }
 764 }
 765
 766 void radeon_dp_link_train(struct drm_encoder *encoder,
 767                           struct drm_connector *connector)
 768 {
 769         struct drm_device *dev = encoder->dev;
 770         struct radeon_device *rdev = dev->dev_private;
 771         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 772         struct radeon_encoder_atom_dig *dig;
 773         struct radeon_connector *radeon_connector;
 774         struct radeon_connector_atom_dig *dig_connector;
 775         struct radeon_dp_link_train_info dp_info;
 776         int index;
 777         u8 tmp, frev, crev;
 778
 779         if (!radeon_encoder->enc_priv)
 780                 return;
 781         dig = radeon_encoder->enc_priv;
 782
 783         radeon_connector = to_radeon_connector(connector);
 784         if (!radeon_connector->con_priv)
 785                 return;
 786         dig_connector = radeon_connector->con_priv;
 787
 788         if ((dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_DISPLAYPORT) &&
 789             (dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_eDP))
 790                 return;
 791
 792         /* DPEncoderService newer than 1.1 can't program properly the
 793          * training pattern. When facing such version use the
 794          * DIGXEncoderControl (X== 1 | 2)
 795          */
 796         dp_info.use_dpencoder = true;
 797         index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
 798         if (atom_parse_cmd_header(rdev->mode_info.atom_context, index, &frev, &crev)) {
 799                 if (crev > 1) {
 800                         dp_info.use_dpencoder = false;
 801                 }
 802         }
 803
 804         dp_info.enc_id = 0;
 805         if (dig->dig_encoder)
 806                 dp_info.enc_id |= ATOM_DP_CONFIG_DIG2_ENCODER;
 807         else
 808                 dp_info.enc_id |= ATOM_DP_CONFIG_DIG1_ENCODER;
 809         if (dig->linkb)
 810                 dp_info.enc_id |= ATOM_DP_CONFIG_LINK_B;
 811         else
 812                 dp_info.enc_id |= ATOM_DP_CONFIG_LINK_A;
 813
 814         if (drm_dp_dpcd_readb(&radeon_connector->ddc_bus->aux, DP_MAX_LANE_COUNT, &tmp)
 815             == 1) {
 816                 if (ASIC_IS_DCE5(rdev) && (tmp & DP_TPS3_SUPPORTED))
 817                         dp_info.tp3_supported = true;
 818                 else
 819                         dp_info.tp3_supported = false;
 820         } else {
 821                 dp_info.tp3_supported = false;
 822         }
 823
 824         memcpy(dp_info.dpcd, dig_connector->dpcd, DP_RECEIVER_CAP_SIZE);
 825         dp_info.rdev = rdev;
 826         dp_info.encoder = encoder;
 827         dp_info.connector = connector;
 828         dp_info.dp_lane_count = dig_connector->dp_lane_count;
 829         dp_info.dp_clock = dig_connector->dp_clock;
 830         dp_info.aux = &radeon_connector->ddc_bus->aux;
 831
 832         if (radeon_dp_link_train_init(&dp_info))
 833                 goto done;
 834         if (radeon_dp_link_train_cr(&dp_info))
 835                 goto done;
 836         if (radeon_dp_link_train_ce(&dp_info))
 837                 goto done;
 838 done:
 839         if (radeon_dp_link_train_finish(&dp_info))
 840                 return;
 841 }