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
 104         base = (unsigned char *)(rdev->mode_info.atom_context->scratch + 1);
 105
 106         radeon_atom_copy_swap(base, send, send_bytes, true);
 107
 108         args.v1.lpAuxRequest = cpu_to_le16((u16)(0 + 4));
 109         args.v1.lpDataOut = cpu_to_le16((u16)(16 + 4));
 110         args.v1.ucDataOutLen = 0;
 111         args.v1.ucChannelID = chan->rec.i2c_id;
 112         args.v1.ucDelay = delay / 10;
 113         if (ASIC_IS_DCE4(rdev))
 114                 args.v2.ucHPD_ID = chan->rec.hpd;
 115
 116         atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
 117
 118         *ack = args.v1.ucReplyStatus;
 119
 120         /* timeout */
 121         if (args.v1.ucReplyStatus == 1) {
 122                 DRM_DEBUG_KMS("dp_aux_ch timeout\n");
 123                 r = -ETIMEDOUT;
 124                 goto done;
 125         }
 126
 127         /* flags not zero */
 128         if (args.v1.ucReplyStatus == 2) {
 129                 DRM_DEBUG_KMS("dp_aux_ch flags not zero\n");
 130                 r = -EIO;
 131                 goto done;
 132         }
 133
 134         /* error */
 135         if (args.v1.ucReplyStatus == 3) {
 136                 DRM_DEBUG_KMS("dp_aux_ch error\n");
 137                 r = -EIO;
 138                 goto done;
 139         }
 140
 141         recv_bytes = args.v1.ucDataOutLen;
 142         if (recv_bytes > recv_size)
 143                 recv_bytes = recv_size;
 144
 145         if (recv && recv_size)
 146                 radeon_atom_copy_swap(recv, base + 16, recv_bytes, false);
 147
 148         r = recv_bytes;
 149 done:
 150         mutex_unlock(&chan->mutex);
 151
 152         return r;
 153 }
 154
 155 #define BARE_ADDRESS_SIZE 3
 156 #define HEADER_SIZE (BARE_ADDRESS_SIZE + 1)
 157
 158 static ssize_t
 159 radeon_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
 160 {
 161         struct radeon_i2c_chan *chan =
 162                 container_of(aux, struct radeon_i2c_chan, aux);
 163         int ret;
 164         u8 tx_buf[20];
 165         size_t tx_size;
 166         u8 ack, delay = 0;
 167
 168         if (WARN_ON(msg->size > 16))
 169                 return -E2BIG;
 170
 171         tx_buf[0] = msg->address & 0xff;
 172         tx_buf[1] = msg->address >> 8;
 173         tx_buf[2] = msg->request << 4;
 174         tx_buf[3] = msg->size ? (msg->size - 1) : 0;
 175
 176         switch (msg->request & ~DP_AUX_I2C_MOT) {
 177         case DP_AUX_NATIVE_WRITE:
 178         case DP_AUX_I2C_WRITE:
 179                 /* tx_size needs to be 4 even for bare address packets since the atom
 180                  * table needs the info in tx_buf[3].
 181                  */
 182                 tx_size = HEADER_SIZE + msg->size;
 183                 if (msg->size == 0)
 184                         tx_buf[3] |= BARE_ADDRESS_SIZE << 4;
 185                 else
 186                         tx_buf[3] |= tx_size << 4;
 187                 memcpy(tx_buf + HEADER_SIZE, msg->buffer, msg->size);
 188                 ret = radeon_process_aux_ch(chan,
 189                                             tx_buf, tx_size, NULL, 0, delay, &ack);
 190                 if (ret >= 0)
 191                         /* Return payload size. */
 192                         ret = msg->size;
 193                 break;
 194         case DP_AUX_NATIVE_READ:
 195         case DP_AUX_I2C_READ:
 196                 /* tx_size needs to be 4 even for bare address packets since the atom
 197                  * table needs the info in tx_buf[3].
 198                  */
 199                 tx_size = HEADER_SIZE;
 200                 if (msg->size == 0)
 201                         tx_buf[3] |= BARE_ADDRESS_SIZE << 4;
 202                 else
 203                         tx_buf[3] |= tx_size << 4;
 204                 ret = radeon_process_aux_ch(chan,
 205                                             tx_buf, tx_size, msg->buffer, msg->size, delay, &ack);
 206                 break;
 207         default:
 208                 ret = -EINVAL;
 209                 break;
 210         }
 211
 212         if (ret >= 0)
 213                 msg->reply = ack >> 4;
 214
 215         return ret;
 216 }
 217
 218 void radeon_dp_aux_init(struct radeon_connector *radeon_connector)
 219 {
 220         int ret;
 221
 222         radeon_connector->ddc_bus->rec.hpd = radeon_connector->hpd.hpd;
 223         radeon_connector->ddc_bus->aux.dev = radeon_connector->base.kdev;
 224         radeon_connector->ddc_bus->aux.transfer = radeon_dp_aux_transfer;
 225
 226         ret = drm_dp_aux_register(&radeon_connector->ddc_bus->aux);
 227         if (!ret)
 228                 radeon_connector->ddc_bus->has_aux = true;
 229
 230         WARN(ret, "drm_dp_aux_register() failed with error %d\n", ret);
 231 }
 232
 233 /***** general DP utility functions *****/
 234
 235 #define DP_VOLTAGE_MAX         DP_TRAIN_VOLTAGE_SWING_LEVEL_3
 236 #define DP_PRE_EMPHASIS_MAX    DP_TRAIN_PRE_EMPH_LEVEL_3
 237
 238 static void dp_get_adjust_train(u8 link_status[DP_LINK_STATUS_SIZE],
 239                                 int lane_count,
 240                                 u8 train_set[4])
 241 {
 242         u8 v = 0;
 243         u8 p = 0;
 244         int lane;
 245
 246         for (lane = 0; lane < lane_count; lane++) {
 247                 u8 this_v = drm_dp_get_adjust_request_voltage(link_status, lane);
 248                 u8 this_p = drm_dp_get_adjust_request_pre_emphasis(link_status, lane);
 249
 250                 DRM_DEBUG_KMS("requested signal parameters: lane %d voltage %s pre_emph %s\n",
 251                           lane,
 252                           voltage_names[this_v >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
 253                           pre_emph_names[this_p >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
 254
 255                 if (this_v > v)
 256                         v = this_v;
 257                 if (this_p > p)
 258                         p = this_p;
 259         }
 260
 261         if (v >= DP_VOLTAGE_MAX)
 262                 v |= DP_TRAIN_MAX_SWING_REACHED;
 263
 264         if (p >= DP_PRE_EMPHASIS_MAX)
 265                 p |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
 266
 267         DRM_DEBUG_KMS("using signal parameters: voltage %s pre_emph %s\n",
 268                   voltage_names[(v & DP_TRAIN_VOLTAGE_SWING_MASK) >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
 269                   pre_emph_names[(p & DP_TRAIN_PRE_EMPHASIS_MASK) >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
 270
 271         for (lane = 0; lane < 4; lane++)
 272                 train_set[lane] = v | p;
 273 }
 274
 275 /* convert bits per color to bits per pixel */
 276 /* get bpc from the EDID */
 277 static int convert_bpc_to_bpp(int bpc)
 278 {
 279         if (bpc == 0)
 280                 return 24;
 281         else
 282                 return bpc * 3;
 283 }
 284
 285 /* get the max pix clock supported by the link rate and lane num */
 286 static int dp_get_max_dp_pix_clock(int link_rate,
 287                                    int lane_num,
 288                                    int bpp)
 289 {
 290         return (link_rate * lane_num * 8) / bpp;
 291 }
 292
 293 /***** radeon specific DP functions *****/
 294
 295 static int radeon_dp_get_max_link_rate(struct drm_connector *connector,
 296                                        u8 dpcd[DP_DPCD_SIZE])
 297 {
 298         int max_link_rate;
 299
 300         if (radeon_connector_is_dp12_capable(connector))
 301                 max_link_rate = min(drm_dp_max_link_rate(dpcd), 540000);
 302         else
 303                 max_link_rate = min(drm_dp_max_link_rate(dpcd), 270000);
 304
 305         return max_link_rate;
 306 }
 307
 308 /* First get the min lane# when low rate is used according to pixel clock
 309  * (prefer low rate), second check max lane# supported by DP panel,
 310  * if the max lane# < low rate lane# then use max lane# instead.
 311  */
 312 static int radeon_dp_get_dp_lane_number(struct drm_connector *connector,
 313                                         u8 dpcd[DP_DPCD_SIZE],
 314                                         int pix_clock)
 315 {
 316         int bpp = convert_bpc_to_bpp(radeon_get_monitor_bpc(connector));
 317         int max_link_rate = radeon_dp_get_max_link_rate(connector, dpcd);
 318         int max_lane_num = drm_dp_max_lane_count(dpcd);
 319         int lane_num;
 320         int max_dp_pix_clock;
 321
 322         for (lane_num = 1; lane_num < max_lane_num; lane_num <<= 1) {
 323                 max_dp_pix_clock = dp_get_max_dp_pix_clock(max_link_rate, lane_num, bpp);
 324                 if (pix_clock <= max_dp_pix_clock)
 325                         break;
 326         }
 327
 328         return lane_num;
 329 }
 330
 331 static int radeon_dp_get_dp_link_clock(struct drm_connector *connector,
 332                                        u8 dpcd[DP_DPCD_SIZE],
 333                                        int pix_clock)
 334 {
 335         int bpp = convert_bpc_to_bpp(radeon_get_monitor_bpc(connector));
 336         int lane_num, max_pix_clock;
 337
 338         if (radeon_connector_encoder_get_dp_bridge_encoder_id(connector) ==
 339             ENCODER_OBJECT_ID_NUTMEG)
 340                 return 270000;
 341
 342         lane_num = radeon_dp_get_dp_lane_number(connector, dpcd, pix_clock);
 343         max_pix_clock = dp_get_max_dp_pix_clock(162000, lane_num, bpp);
 344         if (pix_clock <= max_pix_clock)
 345                 return 162000;
 346         max_pix_clock = dp_get_max_dp_pix_clock(270000, lane_num, bpp);
 347         if (pix_clock <= max_pix_clock)
 348                 return 270000;
 349         if (radeon_connector_is_dp12_capable(connector)) {
 350                 max_pix_clock = dp_get_max_dp_pix_clock(540000, lane_num, bpp);
 351                 if (pix_clock <= max_pix_clock)
 352                         return 540000;
 353         }
 354
 355         return radeon_dp_get_max_link_rate(connector, dpcd);
 356 }
 357
 358 static u8 radeon_dp_encoder_service(struct radeon_device *rdev,
 359                                     int action, int dp_clock,
 360                                     u8 ucconfig, u8 lane_num)
 361 {
 362         DP_ENCODER_SERVICE_PARAMETERS args;
 363         int index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
 364
 365         memset(&args, 0, sizeof(args));
 366         args.ucLinkClock = dp_clock / 10;
 367         args.ucConfig = ucconfig;
 368         args.ucAction = action;
 369         args.ucLaneNum = lane_num;
 370         args.ucStatus = 0;
 371
 372         atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
 373         return args.ucStatus;
 374 }
 375
 376 u8 radeon_dp_getsinktype(struct radeon_connector *radeon_connector)
 377 {
 378         struct drm_device *dev = radeon_connector->base.dev;
 379         struct radeon_device *rdev = dev->dev_private;
 380
 381         return radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_GET_SINK_TYPE, 0,
 382                                          radeon_connector->ddc_bus->rec.i2c_id, 0);
 383 }
 384
 385 static void radeon_dp_probe_oui(struct radeon_connector *radeon_connector)
 386 {
 387         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 388         u8 buf[3];
 389
 390         if (!(dig_connector->dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT))
 391                 return;
 392
 393         if (drm_dp_dpcd_read(&radeon_connector->ddc_bus->aux, DP_SINK_OUI, buf, 3) == 3)
 394                 DRM_DEBUG_KMS("Sink OUI: %02hx%02hx%02hx\n",
 395                               buf[0], buf[1], buf[2]);
 396
 397         if (drm_dp_dpcd_read(&radeon_connector->ddc_bus->aux, DP_BRANCH_OUI, buf, 3) == 3)
 398                 DRM_DEBUG_KMS("Branch OUI: %02hx%02hx%02hx\n",
 399                               buf[0], buf[1], buf[2]);
 400 }
 401
 402 bool radeon_dp_getdpcd(struct radeon_connector *radeon_connector)
 403 {
 404         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 405         u8 msg[DP_DPCD_SIZE];
 406         int ret;
 407
 408         ret = drm_dp_dpcd_read(&radeon_connector->ddc_bus->aux, DP_DPCD_REV, msg,
 409                                DP_DPCD_SIZE);
 410         if (ret > 0) {
 411                 memcpy(dig_connector->dpcd, msg, DP_DPCD_SIZE);
 412
 413                 DRM_DEBUG_KMS("DPCD: %*ph\n", (int)sizeof(dig_connector->dpcd),
 414                               dig_connector->dpcd);
 415
 416                 radeon_dp_probe_oui(radeon_connector);
 417
 418                 return true;
 419         }
 420         dig_connector->dpcd[0] = 0;
 421         return false;
 422 }
 423
 424 int radeon_dp_get_panel_mode(struct drm_encoder *encoder,
 425                              struct drm_connector *connector)
 426 {
 427         struct drm_device *dev = encoder->dev;
 428         struct radeon_device *rdev = dev->dev_private;
 429         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 430         struct radeon_connector_atom_dig *dig_connector;
 431         int panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
 432         u16 dp_bridge = radeon_connector_encoder_get_dp_bridge_encoder_id(connector);
 433         u8 tmp;
 434
 435         if (!ASIC_IS_DCE4(rdev))
 436                 return panel_mode;
 437
 438         if (!radeon_connector->con_priv)
 439                 return panel_mode;
 440
 441         dig_connector = radeon_connector->con_priv;
 442
 443         if (dp_bridge != ENCODER_OBJECT_ID_NONE) {
 444                 /* DP bridge chips */
 445                 if (drm_dp_dpcd_readb(&radeon_connector->ddc_bus->aux,
 446                                       DP_EDP_CONFIGURATION_CAP, &tmp) == 1) {
 447                         if (tmp & 1)
 448                                 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
 449                         else if ((dp_bridge == ENCODER_OBJECT_ID_NUTMEG) ||
 450                                  (dp_bridge == ENCODER_OBJECT_ID_TRAVIS))
 451                                 panel_mode = DP_PANEL_MODE_INTERNAL_DP1_MODE;
 452                         else
 453                                 panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
 454                 }
 455         } else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
 456                 /* eDP */
 457                 if (drm_dp_dpcd_readb(&radeon_connector->ddc_bus->aux,
 458                                       DP_EDP_CONFIGURATION_CAP, &tmp) == 1) {
 459                         if (tmp & 1)
 460                                 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
 461                 }
 462         }
 463
 464         return panel_mode;
 465 }
 466
 467 void radeon_dp_set_link_config(struct drm_connector *connector,
 468                                const struct drm_display_mode *mode)
 469 {
 470         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 471         struct radeon_connector_atom_dig *dig_connector;
 472
 473         if (!radeon_connector->con_priv)
 474                 return;
 475         dig_connector = radeon_connector->con_priv;
 476
 477         if ((dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) ||
 478             (dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_eDP)) {
 479                 dig_connector->dp_clock =
 480                         radeon_dp_get_dp_link_clock(connector, dig_connector->dpcd, mode->clock);
 481                 dig_connector->dp_lane_count =
 482                         radeon_dp_get_dp_lane_number(connector, dig_connector->dpcd, mode->clock);
 483         }
 484 }
 485
 486 int radeon_dp_mode_valid_helper(struct drm_connector *connector,
 487                                 struct drm_display_mode *mode)
 488 {
 489         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 490         struct radeon_connector_atom_dig *dig_connector;
 491         int dp_clock;
 492
 493         if (!radeon_connector->con_priv)
 494                 return MODE_CLOCK_HIGH;
 495         dig_connector = radeon_connector->con_priv;
 496
 497         dp_clock =
 498                 radeon_dp_get_dp_link_clock(connector, dig_connector->dpcd, mode->clock);
 499
 500         if ((dp_clock == 540000) &&
 501             (!radeon_connector_is_dp12_capable(connector)))
 502                 return MODE_CLOCK_HIGH;
 503
 504         return MODE_OK;
 505 }
 506
 507 bool radeon_dp_needs_link_train(struct radeon_connector *radeon_connector)
 508 {
 509         u8 link_status[DP_LINK_STATUS_SIZE];
 510         struct radeon_connector_atom_dig *dig = radeon_connector->con_priv;
 511
 512         if (drm_dp_dpcd_read_link_status(&radeon_connector->ddc_bus->aux, link_status)
 513             <= 0)
 514                 return false;
 515         if (drm_dp_channel_eq_ok(link_status, dig->dp_lane_count))
 516                 return false;
 517         return true;
 518 }
 519
 520 void radeon_dp_set_rx_power_state(struct drm_connector *connector,
 521                                   u8 power_state)
 522 {
 523         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 524         struct radeon_connector_atom_dig *dig_connector;
 525
 526         if (!radeon_connector->con_priv)
 527                 return;
 528
 529         dig_connector = radeon_connector->con_priv;
 530
 531         /* power up/down the sink */
 532         if (dig_connector->dpcd[0] >= 0x11) {
 533                 drm_dp_dpcd_writeb(&radeon_connector->ddc_bus->aux,
 534                                    DP_SET_POWER, power_state);
 535                 usleep_range(1000, 2000);
 536         }
 537 }
 538
 539
 540 struct radeon_dp_link_train_info {
 541         struct radeon_device *rdev;
 542         struct drm_encoder *encoder;
 543         struct drm_connector *connector;
 544         int enc_id;
 545         int dp_clock;
 546         int dp_lane_count;
 547         bool tp3_supported;
 548         u8 dpcd[DP_RECEIVER_CAP_SIZE];
 549         u8 train_set[4];
 550         u8 link_status[DP_LINK_STATUS_SIZE];
 551         u8 tries;
 552         bool use_dpencoder;
 553         struct drm_dp_aux *aux;
 554 };
 555
 556 static void radeon_dp_update_vs_emph(struct radeon_dp_link_train_info *dp_info)
 557 {
 558         /* set the initial vs/emph on the source */
 559         atombios_dig_transmitter_setup(dp_info->encoder,
 560                                        ATOM_TRANSMITTER_ACTION_SETUP_VSEMPH,
 561                                        0, dp_info->train_set[0]); /* sets all lanes at once */
 562
 563         /* set the vs/emph on the sink */
 564         drm_dp_dpcd_write(dp_info->aux, DP_TRAINING_LANE0_SET,
 565                           dp_info->train_set, dp_info->dp_lane_count);
 566 }
 567
 568 static void radeon_dp_set_tp(struct radeon_dp_link_train_info *dp_info, int tp)
 569 {
 570         int rtp = 0;
 571
 572         /* set training pattern on the source */
 573         if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder) {
 574                 switch (tp) {
 575                 case DP_TRAINING_PATTERN_1:
 576                         rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN1;
 577                         break;
 578                 case DP_TRAINING_PATTERN_2:
 579                         rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN2;
 580                         break;
 581                 case DP_TRAINING_PATTERN_3:
 582                         rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN3;
 583                         break;
 584                 }
 585                 atombios_dig_encoder_setup(dp_info->encoder, rtp, 0);
 586         } else {
 587                 switch (tp) {
 588                 case DP_TRAINING_PATTERN_1:
 589                         rtp = 0;
 590                         break;
 591                 case DP_TRAINING_PATTERN_2:
 592                         rtp = 1;
 593                         break;
 594                 }
 595                 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_PATTERN_SEL,
 596                                           dp_info->dp_clock, dp_info->enc_id, rtp);
 597         }
 598
 599         /* enable training pattern on the sink */
 600         drm_dp_dpcd_writeb(dp_info->aux, DP_TRAINING_PATTERN_SET, tp);
 601 }
 602
 603 static int radeon_dp_link_train_init(struct radeon_dp_link_train_info *dp_info)
 604 {
 605         struct radeon_encoder *radeon_encoder = to_radeon_encoder(dp_info->encoder);
 606         struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
 607         u8 tmp;
 608
 609         /* power up the sink */
 610         radeon_dp_set_rx_power_state(dp_info->connector, DP_SET_POWER_D0);
 611
 612         /* possibly enable downspread on the sink */
 613         if (dp_info->dpcd[3] & 0x1)
 614                 drm_dp_dpcd_writeb(dp_info->aux,
 615                                    DP_DOWNSPREAD_CTRL, DP_SPREAD_AMP_0_5);
 616         else
 617                 drm_dp_dpcd_writeb(dp_info->aux,
 618                                    DP_DOWNSPREAD_CTRL, 0);
 619
 620         if ((dp_info->connector->connector_type == DRM_MODE_CONNECTOR_eDP) &&
 621             (dig->panel_mode == DP_PANEL_MODE_INTERNAL_DP2_MODE)) {
 622                 drm_dp_dpcd_writeb(dp_info->aux, DP_EDP_CONFIGURATION_SET, 1);
 623         }
 624
 625         /* set the lane count on the sink */
 626         tmp = dp_info->dp_lane_count;
 627         if (drm_dp_enhanced_frame_cap(dp_info->dpcd))
 628                 tmp |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
 629         drm_dp_dpcd_writeb(dp_info->aux, DP_LANE_COUNT_SET, tmp);
 630
 631         /* set the link rate on the sink */
 632         tmp = drm_dp_link_rate_to_bw_code(dp_info->dp_clock);
 633         drm_dp_dpcd_writeb(dp_info->aux, DP_LINK_BW_SET, tmp);
 634
 635         /* start training on the source */
 636         if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder)
 637                 atombios_dig_encoder_setup(dp_info->encoder,
 638                                            ATOM_ENCODER_CMD_DP_LINK_TRAINING_START, 0);
 639         else
 640                 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_START,
 641                                           dp_info->dp_clock, dp_info->enc_id, 0);
 642
 643         /* disable the training pattern on the sink */
 644         drm_dp_dpcd_writeb(dp_info->aux,
 645                            DP_TRAINING_PATTERN_SET,
 646                            DP_TRAINING_PATTERN_DISABLE);
 647
 648         return 0;
 649 }
 650
 651 static int radeon_dp_link_train_finish(struct radeon_dp_link_train_info *dp_info)
 652 {
 653         udelay(400);
 654
 655         /* disable the training pattern on the sink */
 656         drm_dp_dpcd_writeb(dp_info->aux,
 657                            DP_TRAINING_PATTERN_SET,
 658                            DP_TRAINING_PATTERN_DISABLE);
 659
 660         /* disable the training pattern on the source */
 661         if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder)
 662                 atombios_dig_encoder_setup(dp_info->encoder,
 663                                            ATOM_ENCODER_CMD_DP_LINK_TRAINING_COMPLETE, 0);
 664         else
 665                 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_COMPLETE,
 666                                           dp_info->dp_clock, dp_info->enc_id, 0);
 667
 668         return 0;
 669 }
 670
 671 static int radeon_dp_link_train_cr(struct radeon_dp_link_train_info *dp_info)
 672 {
 673         bool clock_recovery;
 674         u8 voltage;
 675         int i;
 676
 677         radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_1);
 678         memset(dp_info->train_set, 0, 4);
 679         radeon_dp_update_vs_emph(dp_info);
 680
 681         udelay(400);
 682
 683         /* clock recovery loop */
 684         clock_recovery = false;
 685         dp_info->tries = 0;
 686         voltage = 0xff;
 687         while (1) {
 688                 drm_dp_link_train_clock_recovery_delay(dp_info->dpcd);
 689
 690                 if (drm_dp_dpcd_read_link_status(dp_info->aux,
 691                                                  dp_info->link_status) <= 0) {
 692                         DRM_ERROR("displayport link status failed\n");
 693                         break;
 694                 }
 695
 696                 if (drm_dp_clock_recovery_ok(dp_info->link_status, dp_info->dp_lane_count)) {
 697                         clock_recovery = true;
 698                         break;
 699                 }
 700
 701                 for (i = 0; i < dp_info->dp_lane_count; i++) {
 702                         if ((dp_info->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
 703                                 break;
 704                 }
 705                 if (i == dp_info->dp_lane_count) {
 706                         DRM_ERROR("clock recovery reached max voltage\n");
 707                         break;
 708                 }
 709
 710                 if ((dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
 711                         ++dp_info->tries;
 712                         if (dp_info->tries == 5) {
 713                                 DRM_ERROR("clock recovery tried 5 times\n");
 714                                 break;
 715                         }
 716                 } else
 717                         dp_info->tries = 0;
 718
 719                 voltage = dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
 720
 721                 /* Compute new train_set as requested by sink */
 722                 dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, dp_info->train_set);
 723
 724                 radeon_dp_update_vs_emph(dp_info);
 725         }
 726         if (!clock_recovery) {
 727                 DRM_ERROR("clock recovery failed\n");
 728                 return -1;
 729         } else {
 730                 DRM_DEBUG_KMS("clock recovery at voltage %d pre-emphasis %d\n",
 731                           dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
 732                           (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) >>
 733                           DP_TRAIN_PRE_EMPHASIS_SHIFT);
 734                 return 0;
 735         }
 736 }
 737
 738 static int radeon_dp_link_train_ce(struct radeon_dp_link_train_info *dp_info)
 739 {
 740         bool channel_eq;
 741
 742         if (dp_info->tp3_supported)
 743                 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_3);
 744         else
 745                 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_2);
 746
 747         /* channel equalization loop */
 748         dp_info->tries = 0;
 749         channel_eq = false;
 750         while (1) {
 751                 drm_dp_link_train_channel_eq_delay(dp_info->dpcd);
 752
 753                 if (drm_dp_dpcd_read_link_status(dp_info->aux,
 754                                                  dp_info->link_status) <= 0) {
 755                         DRM_ERROR("displayport link status failed\n");
 756                         break;
 757                 }
 758
 759                 if (drm_dp_channel_eq_ok(dp_info->link_status, dp_info->dp_lane_count)) {
 760                         channel_eq = true;
 761                         break;
 762                 }
 763
 764                 /* Try 5 times */
 765                 if (dp_info->tries > 5) {
 766                         DRM_ERROR("channel eq failed: 5 tries\n");
 767                         break;
 768                 }
 769
 770                 /* Compute new train_set as requested by sink */
 771                 dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, dp_info->train_set);
 772
 773                 radeon_dp_update_vs_emph(dp_info);
 774                 dp_info->tries++;
 775         }
 776
 777         if (!channel_eq) {
 778                 DRM_ERROR("channel eq failed\n");
 779                 return -1;
 780         } else {
 781                 DRM_DEBUG_KMS("channel eq at voltage %d pre-emphasis %d\n",
 782                           dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
 783                           (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK)
 784                           >> DP_TRAIN_PRE_EMPHASIS_SHIFT);
 785                 return 0;
 786         }
 787 }
 788
 789 void radeon_dp_link_train(struct drm_encoder *encoder,
 790                           struct drm_connector *connector)
 791 {
 792         struct drm_device *dev = encoder->dev;
 793         struct radeon_device *rdev = dev->dev_private;
 794         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 795         struct radeon_encoder_atom_dig *dig;
 796         struct radeon_connector *radeon_connector;
 797         struct radeon_connector_atom_dig *dig_connector;
 798         struct radeon_dp_link_train_info dp_info;
 799         int index;
 800         u8 tmp, frev, crev;
 801
 802         if (!radeon_encoder->enc_priv)
 803                 return;
 804         dig = radeon_encoder->enc_priv;
 805
 806         radeon_connector = to_radeon_connector(connector);
 807         if (!radeon_connector->con_priv)
 808                 return;
 809         dig_connector = radeon_connector->con_priv;
 810
 811         if ((dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_DISPLAYPORT) &&
 812             (dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_eDP))
 813                 return;
 814
 815         /* DPEncoderService newer than 1.1 can't program properly the
 816          * training pattern. When facing such version use the
 817          * DIGXEncoderControl (X== 1 | 2)
 818          */
 819         dp_info.use_dpencoder = true;
 820         index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
 821         if (atom_parse_cmd_header(rdev->mode_info.atom_context, index, &frev, &crev)) {
 822                 if (crev > 1) {
 823                         dp_info.use_dpencoder = false;
 824                 }
 825         }
 826
 827         dp_info.enc_id = 0;
 828         if (dig->dig_encoder)
 829                 dp_info.enc_id |= ATOM_DP_CONFIG_DIG2_ENCODER;
 830         else
 831                 dp_info.enc_id |= ATOM_DP_CONFIG_DIG1_ENCODER;
 832         if (dig->linkb)
 833                 dp_info.enc_id |= ATOM_DP_CONFIG_LINK_B;
 834         else
 835                 dp_info.enc_id |= ATOM_DP_CONFIG_LINK_A;
 836
 837         if (drm_dp_dpcd_readb(&radeon_connector->ddc_bus->aux, DP_MAX_LANE_COUNT, &tmp)
 838             == 1) {
 839                 if (ASIC_IS_DCE5(rdev) && (tmp & DP_TPS3_SUPPORTED))
 840                         dp_info.tp3_supported = true;
 841                 else
 842                         dp_info.tp3_supported = false;
 843         } else {
 844                 dp_info.tp3_supported = false;
 845         }
 846
 847         memcpy(dp_info.dpcd, dig_connector->dpcd, DP_RECEIVER_CAP_SIZE);
 848         dp_info.rdev = rdev;
 849         dp_info.encoder = encoder;
 850         dp_info.connector = connector;
 851         dp_info.dp_lane_count = dig_connector->dp_lane_count;
 852         dp_info.dp_clock = dig_connector->dp_clock;
 853         dp_info.aux = &radeon_connector->ddc_bus->aux;
 854
 855         if (radeon_dp_link_train_init(&dp_info))
 856                 goto done;
 857         if (radeon_dp_link_train_cr(&dp_info))
 858                 goto done;
 859         if (radeon_dp_link_train_ce(&dp_info))
 860                 goto done;
 861 done:
 862         if (radeon_dp_link_train_finish(&dp_info))
 863                 return;
 864 }