kernel/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         int r = 0;
  99
 100         memset(&args, 0, sizeof(args));
 101
 102         mutex_lock(&chan->mutex);
 103         mutex_lock(&rdev->mode_info.atom_context->scratch_mutex);
 104
 105         base = (unsigned char *)(rdev->mode_info.atom_context->scratch + 1);
 106
 107         radeon_atom_copy_swap(base, send, send_bytes, true);
 108
 109         args.v1.lpAuxRequest = cpu_to_le16((u16)(0 + 4));
 110         args.v1.lpDataOut = cpu_to_le16((u16)(16 + 4));
 111         args.v1.ucDataOutLen = 0;
 112         args.v1.ucChannelID = chan->rec.i2c_id;
 113         args.v1.ucDelay = delay / 10;
 114         if (ASIC_IS_DCE4(rdev))
 115                 args.v2.ucHPD_ID = chan->rec.hpd;
 116
 117         atom_execute_table_scratch_unlocked(rdev->mode_info.atom_context, index, (uint32_t *)&args);
 118
 119         *ack = args.v1.ucReplyStatus;
 120
 121         /* timeout */
 122         if (args.v1.ucReplyStatus == 1) {
 123                 DRM_DEBUG_KMS("dp_aux_ch timeout\n");
 124                 r = -ETIMEDOUT;
 125                 goto done;
 126         }
 127
 128         /* flags not zero */
 129         if (args.v1.ucReplyStatus == 2) {
 130                 DRM_DEBUG_KMS("dp_aux_ch flags not zero\n");
 131                 r = -EIO;
 132                 goto done;
 133         }
 134
 135         /* error */
 136         if (args.v1.ucReplyStatus == 3) {
 137                 DRM_DEBUG_KMS("dp_aux_ch error\n");
 138                 r = -EIO;
 139                 goto done;
 140         }
 141
 142         recv_bytes = args.v1.ucDataOutLen;
 143         if (recv_bytes > recv_size)
 144                 recv_bytes = recv_size;
 145
 146         if (recv && recv_size)
 147                 radeon_atom_copy_swap(recv, base + 16, recv_bytes, false);
 148
 149         r = recv_bytes;
 150 done:
 151         mutex_unlock(&rdev->mode_info.atom_context->scratch_mutex);
 152         mutex_unlock(&chan->mutex);
 153
 154         return r;
 155 }
 156
 157 #define BARE_ADDRESS_SIZE 3
 158 #define HEADER_SIZE (BARE_ADDRESS_SIZE + 1)
 159
 160 static ssize_t
 161 radeon_dp_aux_transfer_atom(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
 162 {
 163         struct radeon_i2c_chan *chan =
 164                 container_of(aux, struct radeon_i2c_chan, aux);
 165         int ret;
 166         u8 tx_buf[20];
 167         size_t tx_size;
 168         u8 ack, delay = 0;
 169
 170         if (WARN_ON(msg->size > 16))
 171                 return -E2BIG;
 172
 173         tx_buf[0] = msg->address & 0xff;
 174         tx_buf[1] = msg->address >> 8;
 175         tx_buf[2] = msg->request << 4;
 176         tx_buf[3] = msg->size ? (msg->size - 1) : 0;
 177
 178         switch (msg->request & ~DP_AUX_I2C_MOT) {
 179         case DP_AUX_NATIVE_WRITE:
 180         case DP_AUX_I2C_WRITE:
 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         if (ASIC_IS_DCE5(rdev)) {
 236                 if (radeon_auxch)
 237                         radeon_connector->ddc_bus->aux.transfer = radeon_dp_aux_transfer_native;
 238                 else
 239                         radeon_connector->ddc_bus->aux.transfer = radeon_dp_aux_transfer_atom;
 240         } else {
 241                 radeon_connector->ddc_bus->aux.transfer = radeon_dp_aux_transfer_atom;
 242         }
 243
 244         ret = drm_dp_aux_register(&radeon_connector->ddc_bus->aux);
 245         if (!ret)
 246                 radeon_connector->ddc_bus->has_aux = true;
 247
 248         WARN(ret, "drm_dp_aux_register() failed with error %d\n", ret);
 249 }
 250
 251 /***** general DP utility functions *****/
 252
 253 #define DP_VOLTAGE_MAX         DP_TRAIN_VOLTAGE_SWING_LEVEL_3
 254 #define DP_PRE_EMPHASIS_MAX    DP_TRAIN_PRE_EMPH_LEVEL_3
 255
 256 static void dp_get_adjust_train(u8 link_status[DP_LINK_STATUS_SIZE],
 257                                 int lane_count,
 258                                 u8 train_set[4])
 259 {
 260         u8 v = 0;
 261         u8 p = 0;
 262         int lane;
 263
 264         for (lane = 0; lane < lane_count; lane++) {
 265                 u8 this_v = drm_dp_get_adjust_request_voltage(link_status, lane);
 266                 u8 this_p = drm_dp_get_adjust_request_pre_emphasis(link_status, lane);
 267
 268                 DRM_DEBUG_KMS("requested signal parameters: lane %d voltage %s pre_emph %s\n",
 269                           lane,
 270                           voltage_names[this_v >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
 271                           pre_emph_names[this_p >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
 272
 273                 if (this_v > v)
 274                         v = this_v;
 275                 if (this_p > p)
 276                         p = this_p;
 277         }
 278
 279         if (v >= DP_VOLTAGE_MAX)
 280                 v |= DP_TRAIN_MAX_SWING_REACHED;
 281
 282         if (p >= DP_PRE_EMPHASIS_MAX)
 283                 p |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
 284
 285         DRM_DEBUG_KMS("using signal parameters: voltage %s pre_emph %s\n",
 286                   voltage_names[(v & DP_TRAIN_VOLTAGE_SWING_MASK) >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
 287                   pre_emph_names[(p & DP_TRAIN_PRE_EMPHASIS_MASK) >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
 288
 289         for (lane = 0; lane < 4; lane++)
 290                 train_set[lane] = v | p;
 291 }
 292
 293 /* convert bits per color to bits per pixel */
 294 /* get bpc from the EDID */
 295 static int convert_bpc_to_bpp(int bpc)
 296 {
 297         if (bpc == 0)
 298                 return 24;
 299         else
 300                 return bpc * 3;
 301 }
 302
 303 /* get the max pix clock supported by the link rate and lane num */
 304 static int dp_get_max_dp_pix_clock(int link_rate,
 305                                    int lane_num,
 306                                    int bpp)
 307 {
 308         return (link_rate * lane_num * 8) / bpp;
 309 }
 310
 311 /***** radeon specific DP functions *****/
 312
 313 int radeon_dp_get_max_link_rate(struct drm_connector *connector,
 314                                 u8 dpcd[DP_DPCD_SIZE])
 315 {
 316         int max_link_rate;
 317
 318         if (radeon_connector_is_dp12_capable(connector))
 319                 max_link_rate = min(drm_dp_max_link_rate(dpcd), 540000);
 320         else
 321                 max_link_rate = min(drm_dp_max_link_rate(dpcd), 270000);
 322
 323         return max_link_rate;
 324 }
 325
 326 /* First get the min lane# when low rate is used according to pixel clock
 327  * (prefer low rate), second check max lane# supported by DP panel,
 328  * if the max lane# < low rate lane# then use max lane# instead.
 329  */
 330 static int radeon_dp_get_dp_lane_number(struct drm_connector *connector,
 331                                         u8 dpcd[DP_DPCD_SIZE],
 332                                         int pix_clock)
 333 {
 334         int bpp = convert_bpc_to_bpp(radeon_get_monitor_bpc(connector));
 335         int max_link_rate = radeon_dp_get_max_link_rate(connector, dpcd);
 336         int max_lane_num = drm_dp_max_lane_count(dpcd);
 337         int lane_num;
 338         int max_dp_pix_clock;
 339
 340         for (lane_num = 1; lane_num < max_lane_num; lane_num <<= 1) {
 341                 max_dp_pix_clock = dp_get_max_dp_pix_clock(max_link_rate, lane_num, bpp);
 342                 if (pix_clock <= max_dp_pix_clock)
 343                         break;
 344         }
 345
 346         return lane_num;
 347 }
 348
 349 static int radeon_dp_get_dp_link_clock(struct drm_connector *connector,
 350                                        u8 dpcd[DP_DPCD_SIZE],
 351                                        int pix_clock)
 352 {
 353         int bpp = convert_bpc_to_bpp(radeon_get_monitor_bpc(connector));
 354         int lane_num, max_pix_clock;
 355
 356         if (radeon_connector_encoder_get_dp_bridge_encoder_id(connector) ==
 357             ENCODER_OBJECT_ID_NUTMEG)
 358                 return 270000;
 359
 360         lane_num = radeon_dp_get_dp_lane_number(connector, dpcd, pix_clock);
 361         max_pix_clock = dp_get_max_dp_pix_clock(162000, lane_num, bpp);
 362         if (pix_clock <= max_pix_clock)
 363                 return 162000;
 364         max_pix_clock = dp_get_max_dp_pix_clock(270000, lane_num, bpp);
 365         if (pix_clock <= max_pix_clock)
 366                 return 270000;
 367         if (radeon_connector_is_dp12_capable(connector)) {
 368                 max_pix_clock = dp_get_max_dp_pix_clock(540000, lane_num, bpp);
 369                 if (pix_clock <= max_pix_clock)
 370                         return 540000;
 371         }
 372
 373         return radeon_dp_get_max_link_rate(connector, dpcd);
 374 }
 375
 376 static u8 radeon_dp_encoder_service(struct radeon_device *rdev,
 377                                     int action, int dp_clock,
 378                                     u8 ucconfig, u8 lane_num)
 379 {
 380         DP_ENCODER_SERVICE_PARAMETERS args;
 381         int index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
 382
 383         memset(&args, 0, sizeof(args));
 384         args.ucLinkClock = dp_clock / 10;
 385         args.ucConfig = ucconfig;
 386         args.ucAction = action;
 387         args.ucLaneNum = lane_num;
 388         args.ucStatus = 0;
 389
 390         atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
 391         return args.ucStatus;
 392 }
 393
 394 u8 radeon_dp_getsinktype(struct radeon_connector *radeon_connector)
 395 {
 396         struct drm_device *dev = radeon_connector->base.dev;
 397         struct radeon_device *rdev = dev->dev_private;
 398
 399         return radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_GET_SINK_TYPE, 0,
 400                                          radeon_connector->ddc_bus->rec.i2c_id, 0);
 401 }
 402
 403 static void radeon_dp_probe_oui(struct radeon_connector *radeon_connector)
 404 {
 405         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 406         u8 buf[3];
 407
 408         if (!(dig_connector->dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT))
 409                 return;
 410
 411         if (drm_dp_dpcd_read(&radeon_connector->ddc_bus->aux, DP_SINK_OUI, buf, 3) == 3)
 412                 DRM_DEBUG_KMS("Sink OUI: %02hx%02hx%02hx\n",
 413                               buf[0], buf[1], buf[2]);
 414
 415         if (drm_dp_dpcd_read(&radeon_connector->ddc_bus->aux, DP_BRANCH_OUI, buf, 3) == 3)
 416                 DRM_DEBUG_KMS("Branch OUI: %02hx%02hx%02hx\n",
 417                               buf[0], buf[1], buf[2]);
 418 }
 419
 420 bool radeon_dp_getdpcd(struct radeon_connector *radeon_connector)
 421 {
 422         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 423         u8 msg[DP_DPCD_SIZE];
 424         int ret, i;
 425
 426         for (i = 0; i < 7; i++) {
 427                 ret = drm_dp_dpcd_read(&radeon_connector->ddc_bus->aux, DP_DPCD_REV, msg,
 428                                        DP_DPCD_SIZE);
 429                 if (ret == DP_DPCD_SIZE) {
 430                         memcpy(dig_connector->dpcd, msg, DP_DPCD_SIZE);
 431
 432                         DRM_DEBUG_KMS("DPCD: %*ph\n", (int)sizeof(dig_connector->dpcd),
 433                                       dig_connector->dpcd);
 434
 435                         radeon_dp_probe_oui(radeon_connector);
 436
 437                         return true;
 438                 }
 439         }
 440         dig_connector->dpcd[0] = 0;
 441         return false;
 442 }
 443
 444 int radeon_dp_get_panel_mode(struct drm_encoder *encoder,
 445                              struct drm_connector *connector)
 446 {
 447         struct drm_device *dev = encoder->dev;
 448         struct radeon_device *rdev = dev->dev_private;
 449         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 450         struct radeon_connector_atom_dig *dig_connector;
 451         int panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
 452         u16 dp_bridge = radeon_connector_encoder_get_dp_bridge_encoder_id(connector);
 453         u8 tmp;
 454
 455         if (!ASIC_IS_DCE4(rdev))
 456                 return panel_mode;
 457
 458         if (!radeon_connector->con_priv)
 459                 return panel_mode;
 460
 461         dig_connector = radeon_connector->con_priv;
 462
 463         if (dp_bridge != ENCODER_OBJECT_ID_NONE) {
 464                 /* DP bridge chips */
 465                 if (drm_dp_dpcd_readb(&radeon_connector->ddc_bus->aux,
 466                                       DP_EDP_CONFIGURATION_CAP, &tmp) == 1) {
 467                         if (tmp & 1)
 468                                 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
 469                         else if ((dp_bridge == ENCODER_OBJECT_ID_NUTMEG) ||
 470                                  (dp_bridge == ENCODER_OBJECT_ID_TRAVIS))
 471                                 panel_mode = DP_PANEL_MODE_INTERNAL_DP1_MODE;
 472                         else
 473                                 panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
 474                 }
 475         } else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
 476                 /* eDP */
 477                 if (drm_dp_dpcd_readb(&radeon_connector->ddc_bus->aux,
 478                                       DP_EDP_CONFIGURATION_CAP, &tmp) == 1) {
 479                         if (tmp & 1)
 480                                 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
 481                 }
 482         }
 483
 484         return panel_mode;
 485 }
 486
 487 void radeon_dp_set_link_config(struct drm_connector *connector,
 488                                const struct drm_display_mode *mode)
 489 {
 490         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 491         struct radeon_connector_atom_dig *dig_connector;
 492
 493         if (!radeon_connector->con_priv)
 494                 return;
 495         dig_connector = radeon_connector->con_priv;
 496
 497         if ((dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) ||
 498             (dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_eDP)) {
 499                 dig_connector->dp_clock =
 500                         radeon_dp_get_dp_link_clock(connector, dig_connector->dpcd, mode->clock);
 501                 dig_connector->dp_lane_count =
 502                         radeon_dp_get_dp_lane_number(connector, dig_connector->dpcd, mode->clock);
 503         }
 504 }
 505
 506 int radeon_dp_mode_valid_helper(struct drm_connector *connector,
 507                                 struct drm_display_mode *mode)
 508 {
 509         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 510         struct radeon_connector_atom_dig *dig_connector;
 511         int dp_clock;
 512
 513         if ((mode->clock > 340000) &&
 514             (!radeon_connector_is_dp12_capable(connector)))
 515                 return MODE_CLOCK_HIGH;
 516
 517         if (!radeon_connector->con_priv)
 518                 return MODE_CLOCK_HIGH;
 519         dig_connector = radeon_connector->con_priv;
 520
 521         dp_clock =
 522                 radeon_dp_get_dp_link_clock(connector, dig_connector->dpcd, mode->clock);
 523
 524         if ((dp_clock == 540000) &&
 525             (!radeon_connector_is_dp12_capable(connector)))
 526                 return MODE_CLOCK_HIGH;
 527
 528         return MODE_OK;
 529 }
 530
 531 bool radeon_dp_needs_link_train(struct radeon_connector *radeon_connector)
 532 {
 533         u8 link_status[DP_LINK_STATUS_SIZE];
 534         struct radeon_connector_atom_dig *dig = radeon_connector->con_priv;
 535
 536         if (drm_dp_dpcd_read_link_status(&radeon_connector->ddc_bus->aux, link_status)
 537             <= 0)
 538                 return false;
 539         if (drm_dp_channel_eq_ok(link_status, dig->dp_lane_count))
 540                 return false;
 541         return true;
 542 }
 543
 544 void radeon_dp_set_rx_power_state(struct drm_connector *connector,
 545                                   u8 power_state)
 546 {
 547         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 548         struct radeon_connector_atom_dig *dig_connector;
 549
 550         if (!radeon_connector->con_priv)
 551                 return;
 552
 553         dig_connector = radeon_connector->con_priv;
 554
 555         /* power up/down the sink */
 556         if (dig_connector->dpcd[0] >= 0x11) {
 557                 drm_dp_dpcd_writeb(&radeon_connector->ddc_bus->aux,
 558                                    DP_SET_POWER, power_state);
 559                 usleep_range(1000, 2000);
 560         }
 561 }
 562
 563
 564 struct radeon_dp_link_train_info {
 565         struct radeon_device *rdev;
 566         struct drm_encoder *encoder;
 567         struct drm_connector *connector;
 568         int enc_id;
 569         int dp_clock;
 570         int dp_lane_count;
 571         bool tp3_supported;
 572         u8 dpcd[DP_RECEIVER_CAP_SIZE];
 573         u8 train_set[4];
 574         u8 link_status[DP_LINK_STATUS_SIZE];
 575         u8 tries;
 576         bool use_dpencoder;
 577         struct drm_dp_aux *aux;
 578 };
 579
 580 static void radeon_dp_update_vs_emph(struct radeon_dp_link_train_info *dp_info)
 581 {
 582         /* set the initial vs/emph on the source */
 583         atombios_dig_transmitter_setup(dp_info->encoder,
 584                                        ATOM_TRANSMITTER_ACTION_SETUP_VSEMPH,
 585                                        0, dp_info->train_set[0]); /* sets all lanes at once */
 586
 587         /* set the vs/emph on the sink */
 588         drm_dp_dpcd_write(dp_info->aux, DP_TRAINING_LANE0_SET,
 589                           dp_info->train_set, dp_info->dp_lane_count);
 590 }
 591
 592 static void radeon_dp_set_tp(struct radeon_dp_link_train_info *dp_info, int tp)
 593 {
 594         int rtp = 0;
 595
 596         /* set training pattern on the source */
 597         if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder) {
 598                 switch (tp) {
 599                 case DP_TRAINING_PATTERN_1:
 600                         rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN1;
 601                         break;
 602                 case DP_TRAINING_PATTERN_2:
 603                         rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN2;
 604                         break;
 605                 case DP_TRAINING_PATTERN_3:
 606                         rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN3;
 607                         break;
 608                 }
 609                 atombios_dig_encoder_setup(dp_info->encoder, rtp, 0);
 610         } else {
 611                 switch (tp) {
 612                 case DP_TRAINING_PATTERN_1:
 613                         rtp = 0;
 614                         break;
 615                 case DP_TRAINING_PATTERN_2:
 616                         rtp = 1;
 617                         break;
 618                 }
 619                 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_PATTERN_SEL,
 620                                           dp_info->dp_clock, dp_info->enc_id, rtp);
 621         }
 622
 623         /* enable training pattern on the sink */
 624         drm_dp_dpcd_writeb(dp_info->aux, DP_TRAINING_PATTERN_SET, tp);
 625 }
 626
 627 static int radeon_dp_link_train_init(struct radeon_dp_link_train_info *dp_info)
 628 {
 629         struct radeon_encoder *radeon_encoder = to_radeon_encoder(dp_info->encoder);
 630         struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
 631         u8 tmp;
 632
 633         /* power up the sink */
 634         radeon_dp_set_rx_power_state(dp_info->connector, DP_SET_POWER_D0);
 635
 636         /* possibly enable downspread on the sink */
 637         if (dp_info->dpcd[3] & 0x1)
 638                 drm_dp_dpcd_writeb(dp_info->aux,
 639                                    DP_DOWNSPREAD_CTRL, DP_SPREAD_AMP_0_5);
 640         else
 641                 drm_dp_dpcd_writeb(dp_info->aux,
 642                                    DP_DOWNSPREAD_CTRL, 0);
 643
 644         if (dig->panel_mode == DP_PANEL_MODE_INTERNAL_DP2_MODE)
 645                 drm_dp_dpcd_writeb(dp_info->aux, DP_EDP_CONFIGURATION_SET, 1);
 646
 647         /* set the lane count on the sink */
 648         tmp = dp_info->dp_lane_count;
 649         if (drm_dp_enhanced_frame_cap(dp_info->dpcd))
 650                 tmp |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
 651         drm_dp_dpcd_writeb(dp_info->aux, DP_LANE_COUNT_SET, tmp);
 652
 653         /* set the link rate on the sink */
 654         tmp = drm_dp_link_rate_to_bw_code(dp_info->dp_clock);
 655         drm_dp_dpcd_writeb(dp_info->aux, DP_LINK_BW_SET, tmp);
 656
 657         /* start training on the source */
 658         if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder)
 659                 atombios_dig_encoder_setup(dp_info->encoder,
 660                                            ATOM_ENCODER_CMD_DP_LINK_TRAINING_START, 0);
 661         else
 662                 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_START,
 663                                           dp_info->dp_clock, dp_info->enc_id, 0);
 664
 665         /* disable the training pattern on the sink */
 666         drm_dp_dpcd_writeb(dp_info->aux,
 667                            DP_TRAINING_PATTERN_SET,
 668                            DP_TRAINING_PATTERN_DISABLE);
 669
 670         return 0;
 671 }
 672
 673 static int radeon_dp_link_train_finish(struct radeon_dp_link_train_info *dp_info)
 674 {
 675         udelay(400);
 676
 677         /* disable the training pattern on the sink */
 678         drm_dp_dpcd_writeb(dp_info->aux,
 679                            DP_TRAINING_PATTERN_SET,
 680                            DP_TRAINING_PATTERN_DISABLE);
 681
 682         /* disable the training pattern on the source */
 683         if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder)
 684                 atombios_dig_encoder_setup(dp_info->encoder,
 685                                            ATOM_ENCODER_CMD_DP_LINK_TRAINING_COMPLETE, 0);
 686         else
 687                 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_COMPLETE,
 688                                           dp_info->dp_clock, dp_info->enc_id, 0);
 689
 690         return 0;
 691 }
 692
 693 static int radeon_dp_link_train_cr(struct radeon_dp_link_train_info *dp_info)
 694 {
 695         bool clock_recovery;
 696         u8 voltage;
 697         int i;
 698
 699         radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_1);
 700         memset(dp_info->train_set, 0, 4);
 701         radeon_dp_update_vs_emph(dp_info);
 702
 703         udelay(400);
 704
 705         /* clock recovery loop */
 706         clock_recovery = false;
 707         dp_info->tries = 0;
 708         voltage = 0xff;
 709         while (1) {
 710                 drm_dp_link_train_clock_recovery_delay(dp_info->dpcd);
 711
 712                 if (drm_dp_dpcd_read_link_status(dp_info->aux,
 713                                                  dp_info->link_status) <= 0) {
 714                         DRM_ERROR("displayport link status failed\n");
 715                         break;
 716                 }
 717
 718                 if (drm_dp_clock_recovery_ok(dp_info->link_status, dp_info->dp_lane_count)) {
 719                         clock_recovery = true;
 720                         break;
 721                 }
 722
 723                 for (i = 0; i < dp_info->dp_lane_count; i++) {
 724                         if ((dp_info->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
 725                                 break;
 726                 }
 727                 if (i == dp_info->dp_lane_count) {
 728                         DRM_ERROR("clock recovery reached max voltage\n");
 729                         break;
 730                 }
 731
 732                 if ((dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
 733                         ++dp_info->tries;
 734                         if (dp_info->tries == 5) {
 735                                 DRM_ERROR("clock recovery tried 5 times\n");
 736                                 break;
 737                         }
 738                 } else
 739                         dp_info->tries = 0;
 740
 741                 voltage = dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
 742
 743                 /* Compute new train_set as requested by sink */
 744                 dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, dp_info->train_set);
 745
 746                 radeon_dp_update_vs_emph(dp_info);
 747         }
 748         if (!clock_recovery) {
 749                 DRM_ERROR("clock recovery failed\n");
 750                 return -1;
 751         } else {
 752                 DRM_DEBUG_KMS("clock recovery at voltage %d pre-emphasis %d\n",
 753                           dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
 754                           (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) >>
 755                           DP_TRAIN_PRE_EMPHASIS_SHIFT);
 756                 return 0;
 757         }
 758 }
 759
 760 static int radeon_dp_link_train_ce(struct radeon_dp_link_train_info *dp_info)
 761 {
 762         bool channel_eq;
 763
 764         if (dp_info->tp3_supported)
 765                 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_3);
 766         else
 767                 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_2);
 768
 769         /* channel equalization loop */
 770         dp_info->tries = 0;
 771         channel_eq = false;
 772         while (1) {
 773                 drm_dp_link_train_channel_eq_delay(dp_info->dpcd);
 774
 775                 if (drm_dp_dpcd_read_link_status(dp_info->aux,
 776                                                  dp_info->link_status) <= 0) {
 777                         DRM_ERROR("displayport link status failed\n");
 778                         break;
 779                 }
 780
 781                 if (drm_dp_channel_eq_ok(dp_info->link_status, dp_info->dp_lane_count)) {
 782                         channel_eq = true;
 783                         break;
 784                 }
 785
 786                 /* Try 5 times */
 787                 if (dp_info->tries > 5) {
 788                         DRM_ERROR("channel eq failed: 5 tries\n");
 789                         break;
 790                 }
 791
 792                 /* Compute new train_set as requested by sink */
 793                 dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, dp_info->train_set);
 794
 795                 radeon_dp_update_vs_emph(dp_info);
 796                 dp_info->tries++;
 797         }
 798
 799         if (!channel_eq) {
 800                 DRM_ERROR("channel eq failed\n");
 801                 return -1;
 802         } else {
 803                 DRM_DEBUG_KMS("channel eq at voltage %d pre-emphasis %d\n",
 804                           dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
 805                           (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK)
 806                           >> DP_TRAIN_PRE_EMPHASIS_SHIFT);
 807                 return 0;
 808         }
 809 }
 810
 811 void radeon_dp_link_train(struct drm_encoder *encoder,
 812                           struct drm_connector *connector)
 813 {
 814         struct drm_device *dev = encoder->dev;
 815         struct radeon_device *rdev = dev->dev_private;
 816         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 817         struct radeon_encoder_atom_dig *dig;
 818         struct radeon_connector *radeon_connector;
 819         struct radeon_connector_atom_dig *dig_connector;
 820         struct radeon_dp_link_train_info dp_info;
 821         int index;
 822         u8 tmp, frev, crev;
 823
 824         if (!radeon_encoder->enc_priv)
 825                 return;
 826         dig = radeon_encoder->enc_priv;
 827
 828         radeon_connector = to_radeon_connector(connector);
 829         if (!radeon_connector->con_priv)
 830                 return;
 831         dig_connector = radeon_connector->con_priv;
 832
 833         if ((dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_DISPLAYPORT) &&
 834             (dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_eDP))
 835                 return;
 836
 837         /* DPEncoderService newer than 1.1 can't program properly the
 838          * training pattern. When facing such version use the
 839          * DIGXEncoderControl (X== 1 | 2)
 840          */
 841         dp_info.use_dpencoder = true;
 842         index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
 843         if (atom_parse_cmd_header(rdev->mode_info.atom_context, index, &frev, &crev)) {
 844                 if (crev > 1) {
 845                         dp_info.use_dpencoder = false;
 846                 }
 847         }
 848
 849         dp_info.enc_id = 0;
 850         if (dig->dig_encoder)
 851                 dp_info.enc_id |= ATOM_DP_CONFIG_DIG2_ENCODER;
 852         else
 853                 dp_info.enc_id |= ATOM_DP_CONFIG_DIG1_ENCODER;
 854         if (dig->linkb)
 855                 dp_info.enc_id |= ATOM_DP_CONFIG_LINK_B;
 856         else
 857                 dp_info.enc_id |= ATOM_DP_CONFIG_LINK_A;
 858
 859         if (drm_dp_dpcd_readb(&radeon_connector->ddc_bus->aux, DP_MAX_LANE_COUNT, &tmp)
 860             == 1) {
 861                 if (ASIC_IS_DCE5(rdev) && (tmp & DP_TPS3_SUPPORTED))
 862                         dp_info.tp3_supported = true;
 863                 else
 864                         dp_info.tp3_supported = false;
 865         } else {
 866                 dp_info.tp3_supported = false;
 867         }
 868
 869         memcpy(dp_info.dpcd, dig_connector->dpcd, DP_RECEIVER_CAP_SIZE);
 870         dp_info.rdev = rdev;
 871         dp_info.encoder = encoder;
 872         dp_info.connector = connector;
 873         dp_info.dp_lane_count = dig_connector->dp_lane_count;
 874         dp_info.dp_clock = dig_connector->dp_clock;
 875         dp_info.aux = &radeon_connector->ddc_bus->aux;
 876
 877         if (radeon_dp_link_train_init(&dp_info))
 878                 goto done;
 879         if (radeon_dp_link_train_cr(&dp_info))
 880                 goto done;
 881         if (radeon_dp_link_train_ce(&dp_info))
 882                 goto done;
 883 done:
 884         if (radeon_dp_link_train_finish(&dp_info))
 885                 return;
 886 }