drivers/gpu/drm/amd/amdgpu/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/amdgpu_drm.h>
  29 #include "amdgpu.h"
  30
  31 #include "atom.h"
  32 #include "atom-bits.h"
  33 #include "atombios_encoders.h"
  34 #include "atombios_dp.h"
  35 #include "amdgpu_connectors.h"
  36 #include "amdgpu_atombios.h"
  37 #include <drm/drm_dp_helper.h>
  38
  39 /* move these to drm_dp_helper.c/h */
  40 #define DP_LINK_CONFIGURATION_SIZE 9
  41 #define DP_DPCD_SIZE DP_RECEIVER_CAP_SIZE
  42
  43 static char *voltage_names[] = {
  44         "0.4V", "0.6V", "0.8V", "1.2V"
  45 };
  46 static char *pre_emph_names[] = {
  47         "0dB", "3.5dB", "6dB", "9.5dB"
  48 };
  49
  50 /***** amdgpu AUX functions *****/
  51
  52 union aux_channel_transaction {
  53         PROCESS_AUX_CHANNEL_TRANSACTION_PS_ALLOCATION v1;
  54         PROCESS_AUX_CHANNEL_TRANSACTION_PARAMETERS_V2 v2;
  55 };
  56
  57 static int amdgpu_atombios_dp_process_aux_ch(struct amdgpu_i2c_chan *chan,
  58                                       u8 *send, int send_bytes,
  59                                       u8 *recv, int recv_size,
  60                                       u8 delay, u8 *ack)
  61 {
  62         struct drm_device *dev = chan->dev;
  63         struct amdgpu_device *adev = drm_to_adev(dev);
  64         union aux_channel_transaction args;
  65         int index = GetIndexIntoMasterTable(COMMAND, ProcessAuxChannelTransaction);
  66         unsigned char *base;
  67         int recv_bytes;
  68         int r = 0;
  69
  70         memset(&args, 0, sizeof(args));
  71
  72         mutex_lock(&chan->mutex);
  73
  74         base = (unsigned char *)(adev->mode_info.atom_context->scratch + 1);
  75
  76         amdgpu_atombios_copy_swap(base, send, send_bytes, true);
  77
  78         args.v2.lpAuxRequest = cpu_to_le16((u16)(0 + 4));
  79         args.v2.lpDataOut = cpu_to_le16((u16)(16 + 4));
  80         args.v2.ucDataOutLen = 0;
  81         args.v2.ucChannelID = chan->rec.i2c_id;
  82         args.v2.ucDelay = delay / 10;
  83         args.v2.ucHPD_ID = chan->rec.hpd;
  84
  85         amdgpu_atom_execute_table(adev->mode_info.atom_context, index, (uint32_t *)&args);
  86
  87         *ack = args.v2.ucReplyStatus;
  88
  89         /* timeout */
  90         if (args.v2.ucReplyStatus == 1) {
  91                 r = -ETIMEDOUT;
  92                 goto done;
  93         }
  94
  95         /* flags not zero */
  96         if (args.v2.ucReplyStatus == 2) {
  97                 DRM_DEBUG_KMS("dp_aux_ch flags not zero\n");
  98                 r = -EIO;
  99                 goto done;
 100         }
 101
 102         /* error */
 103         if (args.v2.ucReplyStatus == 3) {
 104                 DRM_DEBUG_KMS("dp_aux_ch error\n");
 105                 r = -EIO;
 106                 goto done;
 107         }
 108
 109         recv_bytes = args.v1.ucDataOutLen;
 110         if (recv_bytes > recv_size)
 111                 recv_bytes = recv_size;
 112
 113         if (recv && recv_size)
 114                 amdgpu_atombios_copy_swap(recv, base + 16, recv_bytes, false);
 115
 116         r = recv_bytes;
 117 done:
 118         mutex_unlock(&chan->mutex);
 119
 120         return r;
 121 }
 122
 123 #define BARE_ADDRESS_SIZE 3
 124 #define HEADER_SIZE (BARE_ADDRESS_SIZE + 1)
 125
 126 static ssize_t
 127 amdgpu_atombios_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
 128 {
 129         struct amdgpu_i2c_chan *chan =
 130                 container_of(aux, struct amdgpu_i2c_chan, aux);
 131         int ret;
 132         u8 tx_buf[20];
 133         size_t tx_size;
 134         u8 ack, delay = 0;
 135
 136         if (WARN_ON(msg->size > 16))
 137                 return -E2BIG;
 138
 139         tx_buf[0] = msg->address & 0xff;
 140         tx_buf[1] = msg->address >> 8;
 141         tx_buf[2] = (msg->request << 4) |
 142                 ((msg->address >> 16) & 0xf);
 143         tx_buf[3] = msg->size ? (msg->size - 1) : 0;
 144
 145         switch (msg->request & ~DP_AUX_I2C_MOT) {
 146         case DP_AUX_NATIVE_WRITE:
 147         case DP_AUX_I2C_WRITE:
 148                 /* tx_size needs to be 4 even for bare address packets since the atom
 149                  * table needs the info in tx_buf[3].
 150                  */
 151                 tx_size = HEADER_SIZE + msg->size;
 152                 if (msg->size == 0)
 153                         tx_buf[3] |= BARE_ADDRESS_SIZE << 4;
 154                 else
 155                         tx_buf[3] |= tx_size << 4;
 156                 memcpy(tx_buf + HEADER_SIZE, msg->buffer, msg->size);
 157                 ret = amdgpu_atombios_dp_process_aux_ch(chan,
 158                                                  tx_buf, tx_size, NULL, 0, delay, &ack);
 159                 if (ret >= 0)
 160                         /* Return payload size. */
 161                         ret = msg->size;
 162                 break;
 163         case DP_AUX_NATIVE_READ:
 164         case DP_AUX_I2C_READ:
 165                 /* tx_size needs to be 4 even for bare address packets since the atom
 166                  * table needs the info in tx_buf[3].
 167                  */
 168                 tx_size = HEADER_SIZE;
 169                 if (msg->size == 0)
 170                         tx_buf[3] |= BARE_ADDRESS_SIZE << 4;
 171                 else
 172                         tx_buf[3] |= tx_size << 4;
 173                 ret = amdgpu_atombios_dp_process_aux_ch(chan,
 174                                                  tx_buf, tx_size, msg->buffer, msg->size, delay, &ack);
 175                 break;
 176         default:
 177                 ret = -EINVAL;
 178                 break;
 179         }
 180
 181         if (ret >= 0)
 182                 msg->reply = ack >> 4;
 183
 184         return ret;
 185 }
 186
 187 void amdgpu_atombios_dp_aux_init(struct amdgpu_connector *amdgpu_connector)
 188 {
 189         amdgpu_connector->ddc_bus->rec.hpd = amdgpu_connector->hpd.hpd;
 190         amdgpu_connector->ddc_bus->aux.transfer = amdgpu_atombios_dp_aux_transfer;
 191         amdgpu_connector->ddc_bus->aux.drm_dev = amdgpu_connector->base.dev;
 192
 193         drm_dp_aux_init(&amdgpu_connector->ddc_bus->aux);
 194         amdgpu_connector->ddc_bus->has_aux = true;
 195 }
 196
 197 /***** general DP utility functions *****/
 198
 199 #define DP_VOLTAGE_MAX         DP_TRAIN_VOLTAGE_SWING_LEVEL_3
 200 #define DP_PRE_EMPHASIS_MAX    DP_TRAIN_PRE_EMPH_LEVEL_3
 201
 202 static void amdgpu_atombios_dp_get_adjust_train(const u8 link_status[DP_LINK_STATUS_SIZE],
 203                                                 int lane_count,
 204                                                 u8 train_set[4])
 205 {
 206         u8 v = 0;
 207         u8 p = 0;
 208         int lane;
 209
 210         for (lane = 0; lane < lane_count; lane++) {
 211                 u8 this_v = drm_dp_get_adjust_request_voltage(link_status, lane);
 212                 u8 this_p = drm_dp_get_adjust_request_pre_emphasis(link_status, lane);
 213
 214                 DRM_DEBUG_KMS("requested signal parameters: lane %d voltage %s pre_emph %s\n",
 215                           lane,
 216                           voltage_names[this_v >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
 217                           pre_emph_names[this_p >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
 218
 219                 if (this_v > v)
 220                         v = this_v;
 221                 if (this_p > p)
 222                         p = this_p;
 223         }
 224
 225         if (v >= DP_VOLTAGE_MAX)
 226                 v |= DP_TRAIN_MAX_SWING_REACHED;
 227
 228         if (p >= DP_PRE_EMPHASIS_MAX)
 229                 p |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
 230
 231         DRM_DEBUG_KMS("using signal parameters: voltage %s pre_emph %s\n",
 232                   voltage_names[(v & DP_TRAIN_VOLTAGE_SWING_MASK) >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
 233                   pre_emph_names[(p & DP_TRAIN_PRE_EMPHASIS_MASK) >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
 234
 235         for (lane = 0; lane < 4; lane++)
 236                 train_set[lane] = v | p;
 237 }
 238
 239 /* convert bits per color to bits per pixel */
 240 /* get bpc from the EDID */
 241 static unsigned amdgpu_atombios_dp_convert_bpc_to_bpp(int bpc)
 242 {
 243         if (bpc == 0)
 244                 return 24;
 245         else
 246                 return bpc * 3;
 247 }
 248
 249 /***** amdgpu specific DP functions *****/
 250
 251 static int amdgpu_atombios_dp_get_dp_link_config(struct drm_connector *connector,
 252                                                  const u8 dpcd[DP_DPCD_SIZE],
 253                                                  unsigned pix_clock,
 254                                                  unsigned *dp_lanes, unsigned *dp_rate)
 255 {
 256         unsigned bpp =
 257                 amdgpu_atombios_dp_convert_bpc_to_bpp(amdgpu_connector_get_monitor_bpc(connector));
 258         static const unsigned link_rates[3] = { 162000, 270000, 540000 };
 259         unsigned max_link_rate = drm_dp_max_link_rate(dpcd);
 260         unsigned max_lane_num = drm_dp_max_lane_count(dpcd);
 261         unsigned lane_num, i, max_pix_clock;
 262
 263         if (amdgpu_connector_encoder_get_dp_bridge_encoder_id(connector) ==
 264             ENCODER_OBJECT_ID_NUTMEG) {
 265                 for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) {
 266                         max_pix_clock = (lane_num * 270000 * 8) / bpp;
 267                         if (max_pix_clock >= pix_clock) {
 268                                 *dp_lanes = lane_num;
 269                                 *dp_rate = 270000;
 270                                 return 0;
 271                         }
 272                 }
 273         } else {
 274                 for (i = 0; i < ARRAY_SIZE(link_rates) && link_rates[i] <= max_link_rate; i++) {
 275                         for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) {
 276                                 max_pix_clock = (lane_num * link_rates[i] * 8) / bpp;
 277                                 if (max_pix_clock >= pix_clock) {
 278                                         *dp_lanes = lane_num;
 279                                         *dp_rate = link_rates[i];
 280                                         return 0;
 281                                 }
 282                         }
 283                 }
 284         }
 285
 286         return -EINVAL;
 287 }
 288
 289 static u8 amdgpu_atombios_dp_encoder_service(struct amdgpu_device *adev,
 290                                       int action, int dp_clock,
 291                                       u8 ucconfig, u8 lane_num)
 292 {
 293         DP_ENCODER_SERVICE_PARAMETERS args;
 294         int index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
 295
 296         memset(&args, 0, sizeof(args));
 297         args.ucLinkClock = dp_clock / 10;
 298         args.ucConfig = ucconfig;
 299         args.ucAction = action;
 300         args.ucLaneNum = lane_num;
 301         args.ucStatus = 0;
 302
 303         amdgpu_atom_execute_table(adev->mode_info.atom_context, index, (uint32_t *)&args);
 304         return args.ucStatus;
 305 }
 306
 307 u8 amdgpu_atombios_dp_get_sinktype(struct amdgpu_connector *amdgpu_connector)
 308 {
 309         struct drm_device *dev = amdgpu_connector->base.dev;
 310         struct amdgpu_device *adev = drm_to_adev(dev);
 311
 312         return amdgpu_atombios_dp_encoder_service(adev, ATOM_DP_ACTION_GET_SINK_TYPE, 0,
 313                                            amdgpu_connector->ddc_bus->rec.i2c_id, 0);
 314 }
 315
 316 static void amdgpu_atombios_dp_probe_oui(struct amdgpu_connector *amdgpu_connector)
 317 {
 318         struct amdgpu_connector_atom_dig *dig_connector = amdgpu_connector->con_priv;
 319         u8 buf[3];
 320
 321         if (!(dig_connector->dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT))
 322                 return;
 323
 324         if (drm_dp_dpcd_read(&amdgpu_connector->ddc_bus->aux, DP_SINK_OUI, buf, 3) == 3)
 325                 DRM_DEBUG_KMS("Sink OUI: %02hx%02hx%02hx\n",
 326                               buf[0], buf[1], buf[2]);
 327
 328         if (drm_dp_dpcd_read(&amdgpu_connector->ddc_bus->aux, DP_BRANCH_OUI, buf, 3) == 3)
 329                 DRM_DEBUG_KMS("Branch OUI: %02hx%02hx%02hx\n",
 330                               buf[0], buf[1], buf[2]);
 331 }
 332
 333 static void amdgpu_atombios_dp_ds_ports(struct amdgpu_connector *amdgpu_connector)
 334 {
 335         struct amdgpu_connector_atom_dig *dig_connector = amdgpu_connector->con_priv;
 336         int ret;
 337
 338         if (dig_connector->dpcd[DP_DPCD_REV] > 0x10) {
 339                 ret = drm_dp_dpcd_read(&amdgpu_connector->ddc_bus->aux,
 340                                        DP_DOWNSTREAM_PORT_0,
 341                                        dig_connector->downstream_ports,
 342                                        DP_MAX_DOWNSTREAM_PORTS);
 343                 if (ret)
 344                         memset(dig_connector->downstream_ports, 0,
 345                                DP_MAX_DOWNSTREAM_PORTS);
 346         }
 347 }
 348
 349 int amdgpu_atombios_dp_get_dpcd(struct amdgpu_connector *amdgpu_connector)
 350 {
 351         struct amdgpu_connector_atom_dig *dig_connector = amdgpu_connector->con_priv;
 352         u8 msg[DP_DPCD_SIZE];
 353         int ret;
 354
 355         ret = drm_dp_dpcd_read(&amdgpu_connector->ddc_bus->aux, DP_DPCD_REV,
 356                                msg, DP_DPCD_SIZE);
 357         if (ret == DP_DPCD_SIZE) {
 358                 memcpy(dig_connector->dpcd, msg, DP_DPCD_SIZE);
 359
 360                 DRM_DEBUG_KMS("DPCD: %*ph\n", (int)sizeof(dig_connector->dpcd),
 361                               dig_connector->dpcd);
 362
 363                 amdgpu_atombios_dp_probe_oui(amdgpu_connector);
 364                 amdgpu_atombios_dp_ds_ports(amdgpu_connector);
 365                 return 0;
 366         }
 367
 368         dig_connector->dpcd[0] = 0;
 369         return -EINVAL;
 370 }
 371
 372 int amdgpu_atombios_dp_get_panel_mode(struct drm_encoder *encoder,
 373                                struct drm_connector *connector)
 374 {
 375         struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector);
 376         int panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
 377         u16 dp_bridge = amdgpu_connector_encoder_get_dp_bridge_encoder_id(connector);
 378         u8 tmp;
 379
 380         if (!amdgpu_connector->con_priv)
 381                 return panel_mode;
 382
 383         if (dp_bridge != ENCODER_OBJECT_ID_NONE) {
 384                 /* DP bridge chips */
 385                 if (drm_dp_dpcd_readb(&amdgpu_connector->ddc_bus->aux,
 386                                       DP_EDP_CONFIGURATION_CAP, &tmp) == 1) {
 387                         if (tmp & 1)
 388                                 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
 389                         else if ((dp_bridge == ENCODER_OBJECT_ID_NUTMEG) ||
 390                                  (dp_bridge == ENCODER_OBJECT_ID_TRAVIS))
 391                                 panel_mode = DP_PANEL_MODE_INTERNAL_DP1_MODE;
 392                         else
 393                                 panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
 394                 }
 395         } else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
 396                 /* eDP */
 397                 if (drm_dp_dpcd_readb(&amdgpu_connector->ddc_bus->aux,
 398                                       DP_EDP_CONFIGURATION_CAP, &tmp) == 1) {
 399                         if (tmp & 1)
 400                                 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
 401                 }
 402         }
 403
 404         return panel_mode;
 405 }
 406
 407 void amdgpu_atombios_dp_set_link_config(struct drm_connector *connector,
 408                                  const struct drm_display_mode *mode)
 409 {
 410         struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector);
 411         struct amdgpu_connector_atom_dig *dig_connector;
 412         int ret;
 413
 414         if (!amdgpu_connector->con_priv)
 415                 return;
 416         dig_connector = amdgpu_connector->con_priv;
 417
 418         if ((dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) ||
 419             (dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_eDP)) {
 420                 ret = amdgpu_atombios_dp_get_dp_link_config(connector, dig_connector->dpcd,
 421                                                             mode->clock,
 422                                                             &dig_connector->dp_lane_count,
 423                                                             &dig_connector->dp_clock);
 424                 if (ret) {
 425                         dig_connector->dp_clock = 0;
 426                         dig_connector->dp_lane_count = 0;
 427                 }
 428         }
 429 }
 430
 431 int amdgpu_atombios_dp_mode_valid_helper(struct drm_connector *connector,
 432                                   struct drm_display_mode *mode)
 433 {
 434         struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector);
 435         struct amdgpu_connector_atom_dig *dig_connector;
 436         unsigned dp_lanes, dp_clock;
 437         int ret;
 438
 439         if (!amdgpu_connector->con_priv)
 440                 return MODE_CLOCK_HIGH;
 441         dig_connector = amdgpu_connector->con_priv;
 442
 443         ret = amdgpu_atombios_dp_get_dp_link_config(connector, dig_connector->dpcd,
 444                                                     mode->clock, &dp_lanes, &dp_clock);
 445         if (ret)
 446                 return MODE_CLOCK_HIGH;
 447
 448         if ((dp_clock == 540000) &&
 449             (!amdgpu_connector_is_dp12_capable(connector)))
 450                 return MODE_CLOCK_HIGH;
 451
 452         return MODE_OK;
 453 }
 454
 455 bool amdgpu_atombios_dp_needs_link_train(struct amdgpu_connector *amdgpu_connector)
 456 {
 457         u8 link_status[DP_LINK_STATUS_SIZE];
 458         struct amdgpu_connector_atom_dig *dig = amdgpu_connector->con_priv;
 459
 460         if (drm_dp_dpcd_read_link_status(&amdgpu_connector->ddc_bus->aux, link_status)
 461             <= 0)
 462                 return false;
 463         if (drm_dp_channel_eq_ok(link_status, dig->dp_lane_count))
 464                 return false;
 465         return true;
 466 }
 467
 468 void amdgpu_atombios_dp_set_rx_power_state(struct drm_connector *connector,
 469                                     u8 power_state)
 470 {
 471         struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector);
 472         struct amdgpu_connector_atom_dig *dig_connector;
 473
 474         if (!amdgpu_connector->con_priv)
 475                 return;
 476
 477         dig_connector = amdgpu_connector->con_priv;
 478
 479         /* power up/down the sink */
 480         if (dig_connector->dpcd[0] >= 0x11) {
 481                 drm_dp_dpcd_writeb(&amdgpu_connector->ddc_bus->aux,
 482                                    DP_SET_POWER, power_state);
 483                 usleep_range(1000, 2000);
 484         }
 485 }
 486
 487 struct amdgpu_atombios_dp_link_train_info {
 488         struct amdgpu_device *adev;
 489         struct drm_encoder *encoder;
 490         struct drm_connector *connector;
 491         int dp_clock;
 492         int dp_lane_count;
 493         bool tp3_supported;
 494         u8 dpcd[DP_RECEIVER_CAP_SIZE];
 495         u8 train_set[4];
 496         u8 link_status[DP_LINK_STATUS_SIZE];
 497         u8 tries;
 498         struct drm_dp_aux *aux;
 499 };
 500
 501 static void
 502 amdgpu_atombios_dp_update_vs_emph(struct amdgpu_atombios_dp_link_train_info *dp_info)
 503 {
 504         /* set the initial vs/emph on the source */
 505         amdgpu_atombios_encoder_setup_dig_transmitter(dp_info->encoder,
 506                                                ATOM_TRANSMITTER_ACTION_SETUP_VSEMPH,
 507                                                0, dp_info->train_set[0]); /* sets all lanes at once */
 508
 509         /* set the vs/emph on the sink */
 510         drm_dp_dpcd_write(dp_info->aux, DP_TRAINING_LANE0_SET,
 511                           dp_info->train_set, dp_info->dp_lane_count);
 512 }
 513
 514 static void
 515 amdgpu_atombios_dp_set_tp(struct amdgpu_atombios_dp_link_train_info *dp_info, int tp)
 516 {
 517         int rtp = 0;
 518
 519         /* set training pattern on the source */
 520         switch (tp) {
 521         case DP_TRAINING_PATTERN_1:
 522                 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN1;
 523                 break;
 524         case DP_TRAINING_PATTERN_2:
 525                 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN2;
 526                 break;
 527         case DP_TRAINING_PATTERN_3:
 528                 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN3;
 529                         break;
 530         }
 531         amdgpu_atombios_encoder_setup_dig_encoder(dp_info->encoder, rtp, 0);
 532
 533         /* enable training pattern on the sink */
 534         drm_dp_dpcd_writeb(dp_info->aux, DP_TRAINING_PATTERN_SET, tp);
 535 }
 536
 537 static int
 538 amdgpu_atombios_dp_link_train_init(struct amdgpu_atombios_dp_link_train_info *dp_info)
 539 {
 540         struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(dp_info->encoder);
 541         struct amdgpu_encoder_atom_dig *dig = amdgpu_encoder->enc_priv;
 542         u8 tmp;
 543
 544         /* power up the sink */
 545         amdgpu_atombios_dp_set_rx_power_state(dp_info->connector, DP_SET_POWER_D0);
 546
 547         /* possibly enable downspread on the sink */
 548         if (dp_info->dpcd[3] & 0x1)
 549                 drm_dp_dpcd_writeb(dp_info->aux,
 550                                    DP_DOWNSPREAD_CTRL, DP_SPREAD_AMP_0_5);
 551         else
 552                 drm_dp_dpcd_writeb(dp_info->aux,
 553                                    DP_DOWNSPREAD_CTRL, 0);
 554
 555         if (dig->panel_mode == DP_PANEL_MODE_INTERNAL_DP2_MODE)
 556                 drm_dp_dpcd_writeb(dp_info->aux, DP_EDP_CONFIGURATION_SET, 1);
 557
 558         /* set the lane count on the sink */
 559         tmp = dp_info->dp_lane_count;
 560         if (drm_dp_enhanced_frame_cap(dp_info->dpcd))
 561                 tmp |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
 562         drm_dp_dpcd_writeb(dp_info->aux, DP_LANE_COUNT_SET, tmp);
 563
 564         /* set the link rate on the sink */
 565         tmp = drm_dp_link_rate_to_bw_code(dp_info->dp_clock);
 566         drm_dp_dpcd_writeb(dp_info->aux, DP_LINK_BW_SET, tmp);
 567
 568         /* start training on the source */
 569         amdgpu_atombios_encoder_setup_dig_encoder(dp_info->encoder,
 570                                            ATOM_ENCODER_CMD_DP_LINK_TRAINING_START, 0);
 571
 572         /* disable the training pattern on the sink */
 573         drm_dp_dpcd_writeb(dp_info->aux,
 574                            DP_TRAINING_PATTERN_SET,
 575                            DP_TRAINING_PATTERN_DISABLE);
 576
 577         return 0;
 578 }
 579
 580 static int
 581 amdgpu_atombios_dp_link_train_finish(struct amdgpu_atombios_dp_link_train_info *dp_info)
 582 {
 583         udelay(400);
 584
 585         /* disable the training pattern on the sink */
 586         drm_dp_dpcd_writeb(dp_info->aux,
 587                            DP_TRAINING_PATTERN_SET,
 588                            DP_TRAINING_PATTERN_DISABLE);
 589
 590         /* disable the training pattern on the source */
 591         amdgpu_atombios_encoder_setup_dig_encoder(dp_info->encoder,
 592                                            ATOM_ENCODER_CMD_DP_LINK_TRAINING_COMPLETE, 0);
 593
 594         return 0;
 595 }
 596
 597 static int
 598 amdgpu_atombios_dp_link_train_cr(struct amdgpu_atombios_dp_link_train_info *dp_info)
 599 {
 600         bool clock_recovery;
 601         u8 voltage;
 602         int i;
 603
 604         amdgpu_atombios_dp_set_tp(dp_info, DP_TRAINING_PATTERN_1);
 605         memset(dp_info->train_set, 0, 4);
 606         amdgpu_atombios_dp_update_vs_emph(dp_info);
 607
 608         udelay(400);
 609
 610         /* clock recovery loop */
 611         clock_recovery = false;
 612         dp_info->tries = 0;
 613         voltage = 0xff;
 614         while (1) {
 615                 drm_dp_link_train_clock_recovery_delay(dp_info->aux, dp_info->dpcd);
 616
 617                 if (drm_dp_dpcd_read_link_status(dp_info->aux,
 618                                                  dp_info->link_status) <= 0) {
 619                         DRM_ERROR("displayport link status failed\n");
 620                         break;
 621                 }
 622
 623                 if (drm_dp_clock_recovery_ok(dp_info->link_status, dp_info->dp_lane_count)) {
 624                         clock_recovery = true;
 625                         break;
 626                 }
 627
 628                 for (i = 0; i < dp_info->dp_lane_count; i++) {
 629                         if ((dp_info->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
 630                                 break;
 631                 }
 632                 if (i == dp_info->dp_lane_count) {
 633                         DRM_ERROR("clock recovery reached max voltage\n");
 634                         break;
 635                 }
 636
 637                 if ((dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
 638                         ++dp_info->tries;
 639                         if (dp_info->tries == 5) {
 640                                 DRM_ERROR("clock recovery tried 5 times\n");
 641                                 break;
 642                         }
 643                 } else
 644                         dp_info->tries = 0;
 645
 646                 voltage = dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
 647
 648                 /* Compute new train_set as requested by sink */
 649                 amdgpu_atombios_dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count,
 650                                              dp_info->train_set);
 651
 652                 amdgpu_atombios_dp_update_vs_emph(dp_info);
 653         }
 654         if (!clock_recovery) {
 655                 DRM_ERROR("clock recovery failed\n");
 656                 return -1;
 657         } else {
 658                 DRM_DEBUG_KMS("clock recovery at voltage %d pre-emphasis %d\n",
 659                           dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
 660                           (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) >>
 661                           DP_TRAIN_PRE_EMPHASIS_SHIFT);
 662                 return 0;
 663         }
 664 }
 665
 666 static int
 667 amdgpu_atombios_dp_link_train_ce(struct amdgpu_atombios_dp_link_train_info *dp_info)
 668 {
 669         bool channel_eq;
 670
 671         if (dp_info->tp3_supported)
 672                 amdgpu_atombios_dp_set_tp(dp_info, DP_TRAINING_PATTERN_3);
 673         else
 674                 amdgpu_atombios_dp_set_tp(dp_info, DP_TRAINING_PATTERN_2);
 675
 676         /* channel equalization loop */
 677         dp_info->tries = 0;
 678         channel_eq = false;
 679         while (1) {
 680                 drm_dp_link_train_channel_eq_delay(dp_info->aux, dp_info->dpcd);
 681
 682                 if (drm_dp_dpcd_read_link_status(dp_info->aux,
 683                                                  dp_info->link_status) <= 0) {
 684                         DRM_ERROR("displayport link status failed\n");
 685                         break;
 686                 }
 687
 688                 if (drm_dp_channel_eq_ok(dp_info->link_status, dp_info->dp_lane_count)) {
 689                         channel_eq = true;
 690                         break;
 691                 }
 692
 693                 /* Try 5 times */
 694                 if (dp_info->tries > 5) {
 695                         DRM_ERROR("channel eq failed: 5 tries\n");
 696                         break;
 697                 }
 698
 699                 /* Compute new train_set as requested by sink */
 700                 amdgpu_atombios_dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count,
 701                                              dp_info->train_set);
 702
 703                 amdgpu_atombios_dp_update_vs_emph(dp_info);
 704                 dp_info->tries++;
 705         }
 706
 707         if (!channel_eq) {
 708                 DRM_ERROR("channel eq failed\n");
 709                 return -1;
 710         } else {
 711                 DRM_DEBUG_KMS("channel eq at voltage %d pre-emphasis %d\n",
 712                           dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
 713                           (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK)
 714                           >> DP_TRAIN_PRE_EMPHASIS_SHIFT);
 715                 return 0;
 716         }
 717 }
 718
 719 void amdgpu_atombios_dp_link_train(struct drm_encoder *encoder,
 720                             struct drm_connector *connector)
 721 {
 722         struct drm_device *dev = encoder->dev;
 723         struct amdgpu_device *adev = drm_to_adev(dev);
 724         struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder);
 725         struct amdgpu_connector *amdgpu_connector;
 726         struct amdgpu_connector_atom_dig *dig_connector;
 727         struct amdgpu_atombios_dp_link_train_info dp_info;
 728         u8 tmp;
 729
 730         if (!amdgpu_encoder->enc_priv)
 731                 return;
 732
 733         amdgpu_connector = to_amdgpu_connector(connector);
 734         if (!amdgpu_connector->con_priv)
 735                 return;
 736         dig_connector = amdgpu_connector->con_priv;
 737
 738         if ((dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_DISPLAYPORT) &&
 739             (dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_eDP))
 740                 return;
 741
 742         if (drm_dp_dpcd_readb(&amdgpu_connector->ddc_bus->aux, DP_MAX_LANE_COUNT, &tmp)
 743             == 1) {
 744                 if (tmp & DP_TPS3_SUPPORTED)
 745                         dp_info.tp3_supported = true;
 746                 else
 747                         dp_info.tp3_supported = false;
 748         } else {
 749                 dp_info.tp3_supported = false;
 750         }
 751
 752         memcpy(dp_info.dpcd, dig_connector->dpcd, DP_RECEIVER_CAP_SIZE);
 753         dp_info.adev = adev;
 754         dp_info.encoder = encoder;
 755         dp_info.connector = connector;
 756         dp_info.dp_lane_count = dig_connector->dp_lane_count;
 757         dp_info.dp_clock = dig_connector->dp_clock;
 758         dp_info.aux = &amdgpu_connector->ddc_bus->aux;
 759
 760         if (amdgpu_atombios_dp_link_train_init(&dp_info))
 761                 goto done;
 762         if (amdgpu_atombios_dp_link_train_cr(&dp_info))
 763                 goto done;
 764         if (amdgpu_atombios_dp_link_train_ce(&dp_info))
 765                 goto done;
 766 done:
 767         if (amdgpu_atombios_dp_link_train_finish(&dp_info))
 768                 return;
 769 }