drivers/gpu/drm/radeon/atombios_dp.c

   1 /*
   2  * Copyright 2007-8 Advanced Micro Devices, Inc.
   3  * Copyright 2008 Red Hat Inc.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  19  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  20  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  21  * OTHER DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors: Dave Airlie
  24  *          Alex Deucher
  25  *          Jerome Glisse
  26  */
  27 #include <drm/drmP.h>
  28 #include <drm/radeon_drm.h>
  29 #include "radeon.h"
  30
  31 #include "atom.h"
  32 #include "atom-bits.h"
  33 #include <drm/drm_dp_helper.h>
  34
  35 /* move these to drm_dp_helper.c/h */
  36 #define DP_LINK_CONFIGURATION_SIZE 9
  37 #define DP_DPCD_SIZE DP_RECEIVER_CAP_SIZE
  38
  39 static char *voltage_names[] = {
  40         "0.4V", "0.6V", "0.8V", "1.2V"
  41 };
  42 static char *pre_emph_names[] = {
  43         "0dB", "3.5dB", "6dB", "9.5dB"
  44 };
  45
  46 /***** radeon AUX functions *****/
  47
  48 /* Atom needs data in little endian format
  49  * so swap as appropriate when copying data to
  50  * or from atom. Note that atom operates on
  51  * dw units.
  52  */
  53 void radeon_atom_copy_swap(u8 *dst, u8 *src, u8 num_bytes, bool to_le)
  54 {
  55 #ifdef __BIG_ENDIAN
  56         u8 src_tmp[20], dst_tmp[20]; /* used for byteswapping */
  57         u32 *dst32, *src32;
  58         int i;
  59
  60         memcpy(src_tmp, src, num_bytes);
  61         src32 = (u32 *)src_tmp;
  62         dst32 = (u32 *)dst_tmp;
  63         if (to_le) {
  64                 for (i = 0; i < ((num_bytes + 3) / 4); i++)
  65                         dst32[i] = cpu_to_le32(src32[i]);
  66                 memcpy(dst, dst_tmp, num_bytes);
  67         } else {
  68                 u8 dws = num_bytes & ~3;
  69                 for (i = 0; i < ((num_bytes + 3) / 4); i++)
  70                         dst32[i] = le32_to_cpu(src32[i]);
  71                 memcpy(dst, dst_tmp, dws);
  72                 if (num_bytes % 4) {
  73                         for (i = 0; i < (num_bytes % 4); i++)
  74                                 dst[dws+i] = dst_tmp[dws+i];
  75                 }
  76         }
  77 #else
  78         memcpy(dst, src, num_bytes);
  79 #endif
  80 }
  81
  82 union aux_channel_transaction {
  83         PROCESS_AUX_CHANNEL_TRANSACTION_PS_ALLOCATION v1;
  84         PROCESS_AUX_CHANNEL_TRANSACTION_PARAMETERS_V2 v2;
  85 };
  86
  87 static int radeon_process_aux_ch(struct radeon_i2c_chan *chan,
  88                                  u8 *send, int send_bytes,
  89                                  u8 *recv, int recv_size,
  90                                  u8 delay, u8 *ack)
  91 {
  92         struct drm_device *dev = chan->dev;
  93         struct radeon_device *rdev = dev->dev_private;
  94         union aux_channel_transaction args;
  95         int index = GetIndexIntoMasterTable(COMMAND, ProcessAuxChannelTransaction);
  96         unsigned char *base;
  97         int recv_bytes;
  98
  99         memset(&args, 0, sizeof(args));
 100
 101         base = (unsigned char *)(rdev->mode_info.atom_context->scratch + 1);
 102
 103         radeon_atom_copy_swap(base, send, send_bytes, true);
 104
 105         args.v1.lpAuxRequest = cpu_to_le16((u16)(0 + 4));
 106         args.v1.lpDataOut = cpu_to_le16((u16)(16 + 4));
 107         args.v1.ucDataOutLen = 0;
 108         args.v1.ucChannelID = chan->rec.i2c_id;
 109         args.v1.ucDelay = delay / 10;
 110         if (ASIC_IS_DCE4(rdev))
 111                 args.v2.ucHPD_ID = chan->rec.hpd;
 112
 113         atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
 114
 115         *ack = args.v1.ucReplyStatus;
 116
 117         /* timeout */
 118         if (args.v1.ucReplyStatus == 1) {
 119                 DRM_DEBUG_KMS("dp_aux_ch timeout\n");
 120                 return -ETIMEDOUT;
 121         }
 122
 123         /* flags not zero */
 124         if (args.v1.ucReplyStatus == 2) {
 125                 DRM_DEBUG_KMS("dp_aux_ch flags not zero\n");
 126                 return -EBUSY;
 127         }
 128
 129         /* error */
 130         if (args.v1.ucReplyStatus == 3) {
 131                 DRM_DEBUG_KMS("dp_aux_ch error\n");
 132                 return -EIO;
 133         }
 134
 135         recv_bytes = args.v1.ucDataOutLen;
 136         if (recv_bytes > recv_size)
 137                 recv_bytes = recv_size;
 138
 139         if (recv && recv_size)
 140                 radeon_atom_copy_swap(recv, base + 16, recv_bytes, false);
 141
 142         return recv_bytes;
 143 }
 144
 145 static int radeon_dp_aux_native_write(struct radeon_connector *radeon_connector,
 146                                       u16 address, u8 *send, u8 send_bytes, u8 delay)
 147 {
 148         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 149         int ret;
 150         u8 msg[20];
 151         int msg_bytes = send_bytes + 4;
 152         u8 ack;
 153         unsigned retry;
 154
 155         if (send_bytes > 16)
 156                 return -1;
 157
 158         msg[0] = address;
 159         msg[1] = address >> 8;
 160         msg[2] = AUX_NATIVE_WRITE << 4;
 161         msg[3] = (msg_bytes << 4) | (send_bytes - 1);
 162         memcpy(&msg[4], send, send_bytes);
 163
 164         for (retry = 0; retry < 4; retry++) {
 165                 ret = radeon_process_aux_ch(dig_connector->dp_i2c_bus,
 166                                             msg, msg_bytes, NULL, 0, delay, &ack);
 167                 if (ret == -EBUSY)
 168                         continue;
 169                 else if (ret < 0)
 170                         return ret;
 171                 if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_ACK)
 172                         return send_bytes;
 173                 else if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_DEFER)
 174                         udelay(400);
 175                 else
 176                         return -EIO;
 177         }
 178
 179         return -EIO;
 180 }
 181
 182 static int radeon_dp_aux_native_read(struct radeon_connector *radeon_connector,
 183                                      u16 address, u8 *recv, int recv_bytes, u8 delay)
 184 {
 185         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 186         u8 msg[4];
 187         int msg_bytes = 4;
 188         u8 ack;
 189         int ret;
 190         unsigned retry;
 191
 192         msg[0] = address;
 193         msg[1] = address >> 8;
 194         msg[2] = AUX_NATIVE_READ << 4;
 195         msg[3] = (msg_bytes << 4) | (recv_bytes - 1);
 196
 197         for (retry = 0; retry < 4; retry++) {
 198                 ret = radeon_process_aux_ch(dig_connector->dp_i2c_bus,
 199                                             msg, msg_bytes, recv, recv_bytes, delay, &ack);
 200                 if (ret == -EBUSY)
 201                         continue;
 202                 else if (ret < 0)
 203                         return ret;
 204                 if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_ACK)
 205                         return ret;
 206                 else if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_DEFER)
 207                         udelay(400);
 208                 else if (ret == 0)
 209                         return -EPROTO;
 210                 else
 211                         return -EIO;
 212         }
 213
 214         return -EIO;
 215 }
 216
 217 static void radeon_write_dpcd_reg(struct radeon_connector *radeon_connector,
 218                                  u16 reg, u8 val)
 219 {
 220         radeon_dp_aux_native_write(radeon_connector, reg, &val, 1, 0);
 221 }
 222
 223 static u8 radeon_read_dpcd_reg(struct radeon_connector *radeon_connector,
 224                                u16 reg)
 225 {
 226         u8 val = 0;
 227
 228         radeon_dp_aux_native_read(radeon_connector, reg, &val, 1, 0);
 229
 230         return val;
 231 }
 232
 233 int radeon_dp_i2c_aux_ch(struct i2c_adapter *adapter, int mode,
 234                          u8 write_byte, u8 *read_byte)
 235 {
 236         struct i2c_algo_dp_aux_data *algo_data = adapter->algo_data;
 237         struct radeon_i2c_chan *auxch = (struct radeon_i2c_chan *)adapter;
 238         u16 address = algo_data->address;
 239         u8 msg[5];
 240         u8 reply[2];
 241         unsigned retry;
 242         int msg_bytes;
 243         int reply_bytes = 1;
 244         int ret;
 245         u8 ack;
 246
 247         /* Set up the command byte */
 248         if (mode & MODE_I2C_READ)
 249                 msg[2] = AUX_I2C_READ << 4;
 250         else
 251                 msg[2] = AUX_I2C_WRITE << 4;
 252
 253         if (!(mode & MODE_I2C_STOP))
 254                 msg[2] |= AUX_I2C_MOT << 4;
 255
 256         msg[0] = address;
 257         msg[1] = address >> 8;
 258
 259         switch (mode) {
 260         case MODE_I2C_WRITE:
 261                 msg_bytes = 5;
 262                 msg[3] = msg_bytes << 4;
 263                 msg[4] = write_byte;
 264                 break;
 265         case MODE_I2C_READ:
 266                 msg_bytes = 4;
 267                 msg[3] = msg_bytes << 4;
 268                 break;
 269         default:
 270                 msg_bytes = 4;
 271                 msg[3] = 3 << 4;
 272                 break;
 273         }
 274
 275         for (retry = 0; retry < 4; retry++) {
 276                 ret = radeon_process_aux_ch(auxch,
 277                                             msg, msg_bytes, reply, reply_bytes, 0, &ack);
 278                 if (ret == -EBUSY)
 279                         continue;
 280                 else if (ret < 0) {
 281                         DRM_DEBUG_KMS("aux_ch failed %d\n", ret);
 282                         return ret;
 283                 }
 284
 285                 switch (ack & AUX_NATIVE_REPLY_MASK) {
 286                 case AUX_NATIVE_REPLY_ACK:
 287                         /* I2C-over-AUX Reply field is only valid
 288                          * when paired with AUX ACK.
 289                          */
 290                         break;
 291                 case AUX_NATIVE_REPLY_NACK:
 292                         DRM_DEBUG_KMS("aux_ch native nack\n");
 293                         return -EREMOTEIO;
 294                 case AUX_NATIVE_REPLY_DEFER:
 295                         DRM_DEBUG_KMS("aux_ch native defer\n");
 296                         udelay(400);
 297                         continue;
 298                 default:
 299                         DRM_ERROR("aux_ch invalid native reply 0x%02x\n", ack);
 300                         return -EREMOTEIO;
 301                 }
 302
 303                 switch (ack & AUX_I2C_REPLY_MASK) {
 304                 case AUX_I2C_REPLY_ACK:
 305                         if (mode == MODE_I2C_READ)
 306                                 *read_byte = reply[0];
 307                         return ret;
 308                 case AUX_I2C_REPLY_NACK:
 309                         DRM_DEBUG_KMS("aux_i2c nack\n");
 310                         return -EREMOTEIO;
 311                 case AUX_I2C_REPLY_DEFER:
 312                         DRM_DEBUG_KMS("aux_i2c defer\n");
 313                         udelay(400);
 314                         break;
 315                 default:
 316                         DRM_ERROR("aux_i2c invalid reply 0x%02x\n", ack);
 317                         return -EREMOTEIO;
 318                 }
 319         }
 320
 321         DRM_DEBUG_KMS("aux i2c too many retries, giving up\n");
 322         return -EREMOTEIO;
 323 }
 324
 325 /***** general DP utility functions *****/
 326
 327 #define DP_VOLTAGE_MAX         DP_TRAIN_VOLTAGE_SWING_1200
 328 #define DP_PRE_EMPHASIS_MAX    DP_TRAIN_PRE_EMPHASIS_9_5
 329
 330 static void dp_get_adjust_train(u8 link_status[DP_LINK_STATUS_SIZE],
 331                                 int lane_count,
 332                                 u8 train_set[4])
 333 {
 334         u8 v = 0;
 335         u8 p = 0;
 336         int lane;
 337
 338         for (lane = 0; lane < lane_count; lane++) {
 339                 u8 this_v = drm_dp_get_adjust_request_voltage(link_status, lane);
 340                 u8 this_p = drm_dp_get_adjust_request_pre_emphasis(link_status, lane);
 341
 342                 DRM_DEBUG_KMS("requested signal parameters: lane %d voltage %s pre_emph %s\n",
 343                           lane,
 344                           voltage_names[this_v >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
 345                           pre_emph_names[this_p >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
 346
 347                 if (this_v > v)
 348                         v = this_v;
 349                 if (this_p > p)
 350                         p = this_p;
 351         }
 352
 353         if (v >= DP_VOLTAGE_MAX)
 354                 v |= DP_TRAIN_MAX_SWING_REACHED;
 355
 356         if (p >= DP_PRE_EMPHASIS_MAX)
 357                 p |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
 358
 359         DRM_DEBUG_KMS("using signal parameters: voltage %s pre_emph %s\n",
 360                   voltage_names[(v & DP_TRAIN_VOLTAGE_SWING_MASK) >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
 361                   pre_emph_names[(p & DP_TRAIN_PRE_EMPHASIS_MASK) >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
 362
 363         for (lane = 0; lane < 4; lane++)
 364                 train_set[lane] = v | p;
 365 }
 366
 367 /* convert bits per color to bits per pixel */
 368 /* get bpc from the EDID */
 369 static int convert_bpc_to_bpp(int bpc)
 370 {
 371         if (bpc == 0)
 372                 return 24;
 373         else
 374                 return bpc * 3;
 375 }
 376
 377 /* get the max pix clock supported by the link rate and lane num */
 378 static int dp_get_max_dp_pix_clock(int link_rate,
 379                                    int lane_num,
 380                                    int bpp)
 381 {
 382         return (link_rate * lane_num * 8) / bpp;
 383 }
 384
 385 /***** radeon specific DP functions *****/
 386
 387 static int radeon_dp_get_max_link_rate(struct drm_connector *connector,
 388                                        u8 dpcd[DP_DPCD_SIZE])
 389 {
 390         int max_link_rate;
 391
 392         if (radeon_connector_is_dp12_capable(connector))
 393                 max_link_rate = min(drm_dp_max_link_rate(dpcd), 540000);
 394         else
 395                 max_link_rate = min(drm_dp_max_link_rate(dpcd), 270000);
 396
 397         return max_link_rate;
 398 }
 399
 400 /* First get the min lane# when low rate is used according to pixel clock
 401  * (prefer low rate), second check max lane# supported by DP panel,
 402  * if the max lane# < low rate lane# then use max lane# instead.
 403  */
 404 static int radeon_dp_get_dp_lane_number(struct drm_connector *connector,
 405                                         u8 dpcd[DP_DPCD_SIZE],
 406                                         int pix_clock)
 407 {
 408         int bpp = convert_bpc_to_bpp(radeon_get_monitor_bpc(connector));
 409         int max_link_rate = radeon_dp_get_max_link_rate(connector, dpcd);
 410         int max_lane_num = drm_dp_max_lane_count(dpcd);
 411         int lane_num;
 412         int max_dp_pix_clock;
 413
 414         for (lane_num = 1; lane_num < max_lane_num; lane_num <<= 1) {
 415                 max_dp_pix_clock = dp_get_max_dp_pix_clock(max_link_rate, lane_num, bpp);
 416                 if (pix_clock <= max_dp_pix_clock)
 417                         break;
 418         }
 419
 420         return lane_num;
 421 }
 422
 423 static int radeon_dp_get_dp_link_clock(struct drm_connector *connector,
 424                                        u8 dpcd[DP_DPCD_SIZE],
 425                                        int pix_clock)
 426 {
 427         int bpp = convert_bpc_to_bpp(radeon_get_monitor_bpc(connector));
 428         int lane_num, max_pix_clock;
 429
 430         if (radeon_connector_encoder_get_dp_bridge_encoder_id(connector) ==
 431             ENCODER_OBJECT_ID_NUTMEG)
 432                 return 270000;
 433
 434         lane_num = radeon_dp_get_dp_lane_number(connector, dpcd, pix_clock);
 435         max_pix_clock = dp_get_max_dp_pix_clock(162000, lane_num, bpp);
 436         if (pix_clock <= max_pix_clock)
 437                 return 162000;
 438         max_pix_clock = dp_get_max_dp_pix_clock(270000, lane_num, bpp);
 439         if (pix_clock <= max_pix_clock)
 440                 return 270000;
 441         if (radeon_connector_is_dp12_capable(connector)) {
 442                 max_pix_clock = dp_get_max_dp_pix_clock(540000, lane_num, bpp);
 443                 if (pix_clock <= max_pix_clock)
 444                         return 540000;
 445         }
 446
 447         return radeon_dp_get_max_link_rate(connector, dpcd);
 448 }
 449
 450 static u8 radeon_dp_encoder_service(struct radeon_device *rdev,
 451                                     int action, int dp_clock,
 452                                     u8 ucconfig, u8 lane_num)
 453 {
 454         DP_ENCODER_SERVICE_PARAMETERS args;
 455         int index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
 456
 457         memset(&args, 0, sizeof(args));
 458         args.ucLinkClock = dp_clock / 10;
 459         args.ucConfig = ucconfig;
 460         args.ucAction = action;
 461         args.ucLaneNum = lane_num;
 462         args.ucStatus = 0;
 463
 464         atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
 465         return args.ucStatus;
 466 }
 467
 468 u8 radeon_dp_getsinktype(struct radeon_connector *radeon_connector)
 469 {
 470         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 471         struct drm_device *dev = radeon_connector->base.dev;
 472         struct radeon_device *rdev = dev->dev_private;
 473
 474         return radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_GET_SINK_TYPE, 0,
 475                                          dig_connector->dp_i2c_bus->rec.i2c_id, 0);
 476 }
 477
 478 static void radeon_dp_probe_oui(struct radeon_connector *radeon_connector)
 479 {
 480         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 481         u8 buf[3];
 482
 483         if (!(dig_connector->dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT))
 484                 return;
 485
 486         if (radeon_dp_aux_native_read(radeon_connector, DP_SINK_OUI, buf, 3, 0))
 487                 DRM_DEBUG_KMS("Sink OUI: %02hx%02hx%02hx\n",
 488                               buf[0], buf[1], buf[2]);
 489
 490         if (radeon_dp_aux_native_read(radeon_connector, DP_BRANCH_OUI, buf, 3, 0))
 491                 DRM_DEBUG_KMS("Branch OUI: %02hx%02hx%02hx\n",
 492                               buf[0], buf[1], buf[2]);
 493 }
 494
 495 bool radeon_dp_getdpcd(struct radeon_connector *radeon_connector)
 496 {
 497         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 498         u8 msg[DP_DPCD_SIZE];
 499         int ret, i;
 500
 501         ret = radeon_dp_aux_native_read(radeon_connector, DP_DPCD_REV, msg,
 502                                         DP_DPCD_SIZE, 0);
 503         if (ret > 0) {
 504                 memcpy(dig_connector->dpcd, msg, DP_DPCD_SIZE);
 505                 DRM_DEBUG_KMS("DPCD: ");
 506                 for (i = 0; i < DP_DPCD_SIZE; i++)
 507                         DRM_DEBUG_KMS("%02x ", msg[i]);
 508                 DRM_DEBUG_KMS("\n");
 509
 510                 radeon_dp_probe_oui(radeon_connector);
 511
 512                 return true;
 513         }
 514         dig_connector->dpcd[0] = 0;
 515         return false;
 516 }
 517
 518 int radeon_dp_get_panel_mode(struct drm_encoder *encoder,
 519                              struct drm_connector *connector)
 520 {
 521         struct drm_device *dev = encoder->dev;
 522         struct radeon_device *rdev = dev->dev_private;
 523         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 524         int panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
 525         u16 dp_bridge = radeon_connector_encoder_get_dp_bridge_encoder_id(connector);
 526         u8 tmp;
 527
 528         if (!ASIC_IS_DCE4(rdev))
 529                 return panel_mode;
 530
 531         if (dp_bridge != ENCODER_OBJECT_ID_NONE) {
 532                 /* DP bridge chips */
 533                 tmp = radeon_read_dpcd_reg(radeon_connector, DP_EDP_CONFIGURATION_CAP);
 534                 if (tmp & 1)
 535                         panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
 536                 else if ((dp_bridge == ENCODER_OBJECT_ID_NUTMEG) ||
 537                          (dp_bridge == ENCODER_OBJECT_ID_TRAVIS))
 538                         panel_mode = DP_PANEL_MODE_INTERNAL_DP1_MODE;
 539                 else
 540                         panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
 541         } else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
 542                 /* eDP */
 543                 tmp = radeon_read_dpcd_reg(radeon_connector, DP_EDP_CONFIGURATION_CAP);
 544                 if (tmp & 1)
 545                         panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
 546         }
 547
 548         return panel_mode;
 549 }
 550
 551 void radeon_dp_set_link_config(struct drm_connector *connector,
 552                                const struct drm_display_mode *mode)
 553 {
 554         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 555         struct radeon_connector_atom_dig *dig_connector;
 556
 557         if (!radeon_connector->con_priv)
 558                 return;
 559         dig_connector = radeon_connector->con_priv;
 560
 561         if ((dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) ||
 562             (dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_eDP)) {
 563                 dig_connector->dp_clock =
 564                         radeon_dp_get_dp_link_clock(connector, dig_connector->dpcd, mode->clock);
 565                 dig_connector->dp_lane_count =
 566                         radeon_dp_get_dp_lane_number(connector, dig_connector->dpcd, mode->clock);
 567         }
 568 }
 569
 570 int radeon_dp_mode_valid_helper(struct drm_connector *connector,
 571                                 struct drm_display_mode *mode)
 572 {
 573         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 574         struct radeon_connector_atom_dig *dig_connector;
 575         int dp_clock;
 576
 577         if ((mode->clock > 340000) &&
 578             (!radeon_connector_is_dp12_capable(connector)))
 579                 return MODE_CLOCK_HIGH;
 580
 581         if (!radeon_connector->con_priv)
 582                 return MODE_CLOCK_HIGH;
 583         dig_connector = radeon_connector->con_priv;
 584
 585         dp_clock =
 586                 radeon_dp_get_dp_link_clock(connector, dig_connector->dpcd, mode->clock);
 587
 588         if ((dp_clock == 540000) &&
 589             (!radeon_connector_is_dp12_capable(connector)))
 590                 return MODE_CLOCK_HIGH;
 591
 592         return MODE_OK;
 593 }
 594
 595 static bool radeon_dp_get_link_status(struct radeon_connector *radeon_connector,
 596                                       u8 link_status[DP_LINK_STATUS_SIZE])
 597 {
 598         int ret;
 599         ret = radeon_dp_aux_native_read(radeon_connector, DP_LANE0_1_STATUS,
 600                                         link_status, DP_LINK_STATUS_SIZE, 100);
 601         if (ret <= 0) {
 602                 return false;
 603         }
 604
 605         DRM_DEBUG_KMS("link status %*ph\n", 6, link_status);
 606         return true;
 607 }
 608
 609 bool radeon_dp_needs_link_train(struct radeon_connector *radeon_connector)
 610 {
 611         u8 link_status[DP_LINK_STATUS_SIZE];
 612         struct radeon_connector_atom_dig *dig = radeon_connector->con_priv;
 613
 614         if (!radeon_dp_get_link_status(radeon_connector, link_status))
 615                 return false;
 616         if (drm_dp_channel_eq_ok(link_status, dig->dp_lane_count))
 617                 return false;
 618         return true;
 619 }
 620
 621 struct radeon_dp_link_train_info {
 622         struct radeon_device *rdev;
 623         struct drm_encoder *encoder;
 624         struct drm_connector *connector;
 625         struct radeon_connector *radeon_connector;
 626         int enc_id;
 627         int dp_clock;
 628         int dp_lane_count;
 629         bool tp3_supported;
 630         u8 dpcd[DP_RECEIVER_CAP_SIZE];
 631         u8 train_set[4];
 632         u8 link_status[DP_LINK_STATUS_SIZE];
 633         u8 tries;
 634         bool use_dpencoder;
 635 };
 636
 637 static void radeon_dp_update_vs_emph(struct radeon_dp_link_train_info *dp_info)
 638 {
 639         /* set the initial vs/emph on the source */
 640         atombios_dig_transmitter_setup(dp_info->encoder,
 641                                        ATOM_TRANSMITTER_ACTION_SETUP_VSEMPH,
 642                                        0, dp_info->train_set[0]); /* sets all lanes at once */
 643
 644         /* set the vs/emph on the sink */
 645         radeon_dp_aux_native_write(dp_info->radeon_connector, DP_TRAINING_LANE0_SET,
 646                                    dp_info->train_set, dp_info->dp_lane_count, 0);
 647 }
 648
 649 static void radeon_dp_set_tp(struct radeon_dp_link_train_info *dp_info, int tp)
 650 {
 651         int rtp = 0;
 652
 653         /* set training pattern on the source */
 654         if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder) {
 655                 switch (tp) {
 656                 case DP_TRAINING_PATTERN_1:
 657                         rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN1;
 658                         break;
 659                 case DP_TRAINING_PATTERN_2:
 660                         rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN2;
 661                         break;
 662                 case DP_TRAINING_PATTERN_3:
 663                         rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN3;
 664                         break;
 665                 }
 666                 atombios_dig_encoder_setup(dp_info->encoder, rtp, 0);
 667         } else {
 668                 switch (tp) {
 669                 case DP_TRAINING_PATTERN_1:
 670                         rtp = 0;
 671                         break;
 672                 case DP_TRAINING_PATTERN_2:
 673                         rtp = 1;
 674                         break;
 675                 }
 676                 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_PATTERN_SEL,
 677                                           dp_info->dp_clock, dp_info->enc_id, rtp);
 678         }
 679
 680         /* enable training pattern on the sink */
 681         radeon_write_dpcd_reg(dp_info->radeon_connector, DP_TRAINING_PATTERN_SET, tp);
 682 }
 683
 684 static int radeon_dp_link_train_init(struct radeon_dp_link_train_info *dp_info)
 685 {
 686         struct radeon_encoder *radeon_encoder = to_radeon_encoder(dp_info->encoder);
 687         struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
 688         u8 tmp;
 689
 690         /* power up the sink */
 691         if (dp_info->dpcd[0] >= 0x11)
 692                 radeon_write_dpcd_reg(dp_info->radeon_connector,
 693                                       DP_SET_POWER, DP_SET_POWER_D0);
 694
 695         /* possibly enable downspread on the sink */
 696         if (dp_info->dpcd[3] & 0x1)
 697                 radeon_write_dpcd_reg(dp_info->radeon_connector,
 698                                       DP_DOWNSPREAD_CTRL, DP_SPREAD_AMP_0_5);
 699         else
 700                 radeon_write_dpcd_reg(dp_info->radeon_connector,
 701                                       DP_DOWNSPREAD_CTRL, 0);
 702
 703         if ((dp_info->connector->connector_type == DRM_MODE_CONNECTOR_eDP) &&
 704             (dig->panel_mode == DP_PANEL_MODE_INTERNAL_DP2_MODE)) {
 705                 radeon_write_dpcd_reg(dp_info->radeon_connector, DP_EDP_CONFIGURATION_SET, 1);
 706         }
 707
 708         /* set the lane count on the sink */
 709         tmp = dp_info->dp_lane_count;
 710         if (dp_info->dpcd[DP_DPCD_REV] >= 0x11 &&
 711             dp_info->dpcd[DP_MAX_LANE_COUNT] & DP_ENHANCED_FRAME_CAP)
 712                 tmp |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
 713         radeon_write_dpcd_reg(dp_info->radeon_connector, DP_LANE_COUNT_SET, tmp);
 714
 715         /* set the link rate on the sink */
 716         tmp = drm_dp_link_rate_to_bw_code(dp_info->dp_clock);
 717         radeon_write_dpcd_reg(dp_info->radeon_connector, DP_LINK_BW_SET, tmp);
 718
 719         /* start training on the source */
 720         if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder)
 721                 atombios_dig_encoder_setup(dp_info->encoder,
 722                                            ATOM_ENCODER_CMD_DP_LINK_TRAINING_START, 0);
 723         else
 724                 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_START,
 725                                           dp_info->dp_clock, dp_info->enc_id, 0);
 726
 727         /* disable the training pattern on the sink */
 728         radeon_write_dpcd_reg(dp_info->radeon_connector,
 729                               DP_TRAINING_PATTERN_SET,
 730                               DP_TRAINING_PATTERN_DISABLE);
 731
 732         return 0;
 733 }
 734
 735 static int radeon_dp_link_train_finish(struct radeon_dp_link_train_info *dp_info)
 736 {
 737         udelay(400);
 738
 739         /* disable the training pattern on the sink */
 740         radeon_write_dpcd_reg(dp_info->radeon_connector,
 741                               DP_TRAINING_PATTERN_SET,
 742                               DP_TRAINING_PATTERN_DISABLE);
 743
 744         /* disable the training pattern on the source */
 745         if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder)
 746                 atombios_dig_encoder_setup(dp_info->encoder,
 747                                            ATOM_ENCODER_CMD_DP_LINK_TRAINING_COMPLETE, 0);
 748         else
 749                 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_COMPLETE,
 750                                           dp_info->dp_clock, dp_info->enc_id, 0);
 751
 752         return 0;
 753 }
 754
 755 static int radeon_dp_link_train_cr(struct radeon_dp_link_train_info *dp_info)
 756 {
 757         bool clock_recovery;
 758         u8 voltage;
 759         int i;
 760
 761         radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_1);
 762         memset(dp_info->train_set, 0, 4);
 763         radeon_dp_update_vs_emph(dp_info);
 764
 765         udelay(400);
 766
 767         /* clock recovery loop */
 768         clock_recovery = false;
 769         dp_info->tries = 0;
 770         voltage = 0xff;
 771         while (1) {
 772                 drm_dp_link_train_clock_recovery_delay(dp_info->dpcd);
 773
 774                 if (!radeon_dp_get_link_status(dp_info->radeon_connector, dp_info->link_status)) {
 775                         DRM_ERROR("displayport link status failed\n");
 776                         break;
 777                 }
 778
 779                 if (drm_dp_clock_recovery_ok(dp_info->link_status, dp_info->dp_lane_count)) {
 780                         clock_recovery = true;
 781                         break;
 782                 }
 783
 784                 for (i = 0; i < dp_info->dp_lane_count; i++) {
 785                         if ((dp_info->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
 786                                 break;
 787                 }
 788                 if (i == dp_info->dp_lane_count) {
 789                         DRM_ERROR("clock recovery reached max voltage\n");
 790                         break;
 791                 }
 792
 793                 if ((dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
 794                         ++dp_info->tries;
 795                         if (dp_info->tries == 5) {
 796                                 DRM_ERROR("clock recovery tried 5 times\n");
 797                                 break;
 798                         }
 799                 } else
 800                         dp_info->tries = 0;
 801
 802                 voltage = dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
 803
 804                 /* Compute new train_set as requested by sink */
 805                 dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, dp_info->train_set);
 806
 807                 radeon_dp_update_vs_emph(dp_info);
 808         }
 809         if (!clock_recovery) {
 810                 DRM_ERROR("clock recovery failed\n");
 811                 return -1;
 812         } else {
 813                 DRM_DEBUG_KMS("clock recovery at voltage %d pre-emphasis %d\n",
 814                           dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
 815                           (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) >>
 816                           DP_TRAIN_PRE_EMPHASIS_SHIFT);
 817                 return 0;
 818         }
 819 }
 820
 821 static int radeon_dp_link_train_ce(struct radeon_dp_link_train_info *dp_info)
 822 {
 823         bool channel_eq;
 824
 825         if (dp_info->tp3_supported)
 826                 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_3);
 827         else
 828                 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_2);
 829
 830         /* channel equalization loop */
 831         dp_info->tries = 0;
 832         channel_eq = false;
 833         while (1) {
 834                 drm_dp_link_train_channel_eq_delay(dp_info->dpcd);
 835
 836                 if (!radeon_dp_get_link_status(dp_info->radeon_connector, dp_info->link_status)) {
 837                         DRM_ERROR("displayport link status failed\n");
 838                         break;
 839                 }
 840
 841                 if (drm_dp_channel_eq_ok(dp_info->link_status, dp_info->dp_lane_count)) {
 842                         channel_eq = true;
 843                         break;
 844                 }
 845
 846                 /* Try 5 times */
 847                 if (dp_info->tries > 5) {
 848                         DRM_ERROR("channel eq failed: 5 tries\n");
 849                         break;
 850                 }
 851
 852                 /* Compute new train_set as requested by sink */
 853                 dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, dp_info->train_set);
 854
 855                 radeon_dp_update_vs_emph(dp_info);
 856                 dp_info->tries++;
 857         }
 858
 859         if (!channel_eq) {
 860                 DRM_ERROR("channel eq failed\n");
 861                 return -1;
 862         } else {
 863                 DRM_DEBUG_KMS("channel eq at voltage %d pre-emphasis %d\n",
 864                           dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
 865                           (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK)
 866                           >> DP_TRAIN_PRE_EMPHASIS_SHIFT);
 867                 return 0;
 868         }
 869 }
 870
 871 void radeon_dp_link_train(struct drm_encoder *encoder,
 872                           struct drm_connector *connector)
 873 {
 874         struct drm_device *dev = encoder->dev;
 875         struct radeon_device *rdev = dev->dev_private;
 876         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 877         struct radeon_encoder_atom_dig *dig;
 878         struct radeon_connector *radeon_connector;
 879         struct radeon_connector_atom_dig *dig_connector;
 880         struct radeon_dp_link_train_info dp_info;
 881         int index;
 882         u8 tmp, frev, crev;
 883
 884         if (!radeon_encoder->enc_priv)
 885                 return;
 886         dig = radeon_encoder->enc_priv;
 887
 888         radeon_connector = to_radeon_connector(connector);
 889         if (!radeon_connector->con_priv)
 890                 return;
 891         dig_connector = radeon_connector->con_priv;
 892
 893         if ((dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_DISPLAYPORT) &&
 894             (dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_eDP))
 895                 return;
 896
 897         /* DPEncoderService newer than 1.1 can't program properly the
 898          * training pattern. When facing such version use the
 899          * DIGXEncoderControl (X== 1 | 2)
 900          */
 901         dp_info.use_dpencoder = true;
 902         index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
 903         if (atom_parse_cmd_header(rdev->mode_info.atom_context, index, &frev, &crev)) {
 904                 if (crev > 1) {
 905                         dp_info.use_dpencoder = false;
 906                 }
 907         }
 908
 909         dp_info.enc_id = 0;
 910         if (dig->dig_encoder)
 911                 dp_info.enc_id |= ATOM_DP_CONFIG_DIG2_ENCODER;
 912         else
 913                 dp_info.enc_id |= ATOM_DP_CONFIG_DIG1_ENCODER;
 914         if (dig->linkb)
 915                 dp_info.enc_id |= ATOM_DP_CONFIG_LINK_B;
 916         else
 917                 dp_info.enc_id |= ATOM_DP_CONFIG_LINK_A;
 918
 919         tmp = radeon_read_dpcd_reg(radeon_connector, DP_MAX_LANE_COUNT);
 920         if (ASIC_IS_DCE5(rdev) && (tmp & DP_TPS3_SUPPORTED))
 921                 dp_info.tp3_supported = true;
 922         else
 923                 dp_info.tp3_supported = false;
 924
 925         memcpy(dp_info.dpcd, dig_connector->dpcd, DP_RECEIVER_CAP_SIZE);
 926         dp_info.rdev = rdev;
 927         dp_info.encoder = encoder;
 928         dp_info.connector = connector;
 929         dp_info.radeon_connector = radeon_connector;
 930         dp_info.dp_lane_count = dig_connector->dp_lane_count;
 931         dp_info.dp_clock = dig_connector->dp_clock;
 932
 933         if (radeon_dp_link_train_init(&dp_info))
 934                 goto done;
 935         if (radeon_dp_link_train_cr(&dp_info))
 936                 goto done;
 937         if (radeon_dp_link_train_ce(&dp_info))
 938                 goto done;
 939 done:
 940         if (radeon_dp_link_train_finish(&dp_info))
 941                 return;
 942 }