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] = DP_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 < 7; 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                 ack >>= 4;
 172                 if ((ack & DP_AUX_NATIVE_REPLY_MASK) == DP_AUX_NATIVE_REPLY_ACK)
 173                         return send_bytes;
 174                 else if ((ack & DP_AUX_NATIVE_REPLY_MASK) == DP_AUX_NATIVE_REPLY_DEFER)
 175                         usleep_range(400, 500);
 176                 else
 177                         return -EIO;
 178         }
 179
 180         return -EIO;
 181 }
 182
 183 static int radeon_dp_aux_native_read(struct radeon_connector *radeon_connector,
 184                                      u16 address, u8 *recv, int recv_bytes, u8 delay)
 185 {
 186         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 187         u8 msg[4];
 188         int msg_bytes = 4;
 189         u8 ack;
 190         int ret;
 191         unsigned retry;
 192
 193         msg[0] = address;
 194         msg[1] = address >> 8;
 195         msg[2] = DP_AUX_NATIVE_READ << 4;
 196         msg[3] = (msg_bytes << 4) | (recv_bytes - 1);
 197
 198         for (retry = 0; retry < 7; retry++) {
 199                 ret = radeon_process_aux_ch(dig_connector->dp_i2c_bus,
 200                                             msg, msg_bytes, recv, recv_bytes, delay, &ack);
 201                 if (ret == -EBUSY)
 202                         continue;
 203                 else if (ret < 0)
 204                         return ret;
 205                 ack >>= 4;
 206                 if ((ack & DP_AUX_NATIVE_REPLY_MASK) == DP_AUX_NATIVE_REPLY_ACK)
 207                         return ret;
 208                 else if ((ack & DP_AUX_NATIVE_REPLY_MASK) == DP_AUX_NATIVE_REPLY_DEFER)
 209                         usleep_range(400, 500);
 210                 else if (ret == 0)
 211                         return -EPROTO;
 212                 else
 213                         return -EIO;
 214         }
 215
 216         return -EIO;
 217 }
 218
 219 static void radeon_write_dpcd_reg(struct radeon_connector *radeon_connector,
 220                                  u16 reg, u8 val)
 221 {
 222         radeon_dp_aux_native_write(radeon_connector, reg, &val, 1, 0);
 223 }
 224
 225 static u8 radeon_read_dpcd_reg(struct radeon_connector *radeon_connector,
 226                                u16 reg)
 227 {
 228         u8 val = 0;
 229
 230         radeon_dp_aux_native_read(radeon_connector, reg, &val, 1, 0);
 231
 232         return val;
 233 }
 234
 235 int radeon_dp_i2c_aux_ch(struct i2c_adapter *adapter, int mode,
 236                          u8 write_byte, u8 *read_byte)
 237 {
 238         struct i2c_algo_dp_aux_data *algo_data = adapter->algo_data;
 239         struct radeon_i2c_chan *auxch = (struct radeon_i2c_chan *)adapter;
 240         u16 address = algo_data->address;
 241         u8 msg[5];
 242         u8 reply[2];
 243         unsigned retry;
 244         int msg_bytes;
 245         int reply_bytes = 1;
 246         int ret;
 247         u8 ack;
 248
 249         /* Set up the command byte */
 250         if (mode & MODE_I2C_READ)
 251                 msg[2] = DP_AUX_I2C_READ << 4;
 252         else
 253                 msg[2] = DP_AUX_I2C_WRITE << 4;
 254
 255         if (!(mode & MODE_I2C_STOP))
 256                 msg[2] |= DP_AUX_I2C_MOT << 4;
 257
 258         msg[0] = address;
 259         msg[1] = address >> 8;
 260
 261         switch (mode) {
 262         case MODE_I2C_WRITE:
 263                 msg_bytes = 5;
 264                 msg[3] = msg_bytes << 4;
 265                 msg[4] = write_byte;
 266                 break;
 267         case MODE_I2C_READ:
 268                 msg_bytes = 4;
 269                 msg[3] = msg_bytes << 4;
 270                 break;
 271         default:
 272                 msg_bytes = 4;
 273                 msg[3] = 3 << 4;
 274                 break;
 275         }
 276
 277         for (retry = 0; retry < 7; retry++) {
 278                 ret = radeon_process_aux_ch(auxch,
 279                                             msg, msg_bytes, reply, reply_bytes, 0, &ack);
 280                 if (ret == -EBUSY)
 281                         continue;
 282                 else if (ret < 0) {
 283                         DRM_DEBUG_KMS("aux_ch failed %d\n", ret);
 284                         return ret;
 285                 }
 286
 287                 switch ((ack >> 4) & DP_AUX_NATIVE_REPLY_MASK) {
 288                 case DP_AUX_NATIVE_REPLY_ACK:
 289                         /* I2C-over-AUX Reply field is only valid
 290                          * when paired with AUX ACK.
 291                          */
 292                         break;
 293                 case DP_AUX_NATIVE_REPLY_NACK:
 294                         DRM_DEBUG_KMS("aux_ch native nack\n");
 295                         return -EREMOTEIO;
 296                 case DP_AUX_NATIVE_REPLY_DEFER:
 297                         DRM_DEBUG_KMS("aux_ch native defer\n");
 298                         usleep_range(500, 600);
 299                         continue;
 300                 default:
 301                         DRM_ERROR("aux_ch invalid native reply 0x%02x\n", ack);
 302                         return -EREMOTEIO;
 303                 }
 304
 305                 switch ((ack >> 4) & DP_AUX_I2C_REPLY_MASK) {
 306                 case DP_AUX_I2C_REPLY_ACK:
 307                         if (mode == MODE_I2C_READ)
 308                                 *read_byte = reply[0];
 309                         return ret;
 310                 case DP_AUX_I2C_REPLY_NACK:
 311                         DRM_DEBUG_KMS("aux_i2c nack\n");
 312                         return -EREMOTEIO;
 313                 case DP_AUX_I2C_REPLY_DEFER:
 314                         DRM_DEBUG_KMS("aux_i2c defer\n");
 315                         usleep_range(400, 500);
 316                         break;
 317                 default:
 318                         DRM_ERROR("aux_i2c invalid reply 0x%02x\n", ack);
 319                         return -EREMOTEIO;
 320                 }
 321         }
 322
 323         DRM_DEBUG_KMS("aux i2c too many retries, giving up\n");
 324         return -EREMOTEIO;
 325 }
 326
 327 /***** general DP utility functions *****/
 328
 329 #define DP_VOLTAGE_MAX         DP_TRAIN_VOLTAGE_SWING_1200
 330 #define DP_PRE_EMPHASIS_MAX    DP_TRAIN_PRE_EMPHASIS_9_5
 331
 332 static void dp_get_adjust_train(u8 link_status[DP_LINK_STATUS_SIZE],
 333                                 int lane_count,
 334                                 u8 train_set[4])
 335 {
 336         u8 v = 0;
 337         u8 p = 0;
 338         int lane;
 339
 340         for (lane = 0; lane < lane_count; lane++) {
 341                 u8 this_v = drm_dp_get_adjust_request_voltage(link_status, lane);
 342                 u8 this_p = drm_dp_get_adjust_request_pre_emphasis(link_status, lane);
 343
 344                 DRM_DEBUG_KMS("requested signal parameters: lane %d voltage %s pre_emph %s\n",
 345                           lane,
 346                           voltage_names[this_v >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
 347                           pre_emph_names[this_p >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
 348
 349                 if (this_v > v)
 350                         v = this_v;
 351                 if (this_p > p)
 352                         p = this_p;
 353         }
 354
 355         if (v >= DP_VOLTAGE_MAX)
 356                 v |= DP_TRAIN_MAX_SWING_REACHED;
 357
 358         if (p >= DP_PRE_EMPHASIS_MAX)
 359                 p |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
 360
 361         DRM_DEBUG_KMS("using signal parameters: voltage %s pre_emph %s\n",
 362                   voltage_names[(v & DP_TRAIN_VOLTAGE_SWING_MASK) >> DP_TRAIN_VOLTAGE_SWING_SHIFT],
 363                   pre_emph_names[(p & DP_TRAIN_PRE_EMPHASIS_MASK) >> DP_TRAIN_PRE_EMPHASIS_SHIFT]);
 364
 365         for (lane = 0; lane < 4; lane++)
 366                 train_set[lane] = v | p;
 367 }
 368
 369 /* convert bits per color to bits per pixel */
 370 /* get bpc from the EDID */
 371 static int convert_bpc_to_bpp(int bpc)
 372 {
 373         if (bpc == 0)
 374                 return 24;
 375         else
 376                 return bpc * 3;
 377 }
 378
 379 /* get the max pix clock supported by the link rate and lane num */
 380 static int dp_get_max_dp_pix_clock(int link_rate,
 381                                    int lane_num,
 382                                    int bpp)
 383 {
 384         return (link_rate * lane_num * 8) / bpp;
 385 }
 386
 387 /***** radeon specific DP functions *****/
 388
 389 static int radeon_dp_get_max_link_rate(struct drm_connector *connector,
 390                                        u8 dpcd[DP_DPCD_SIZE])
 391 {
 392         int max_link_rate;
 393
 394         if (radeon_connector_is_dp12_capable(connector))
 395                 max_link_rate = min(drm_dp_max_link_rate(dpcd), 540000);
 396         else
 397                 max_link_rate = min(drm_dp_max_link_rate(dpcd), 270000);
 398
 399         return max_link_rate;
 400 }
 401
 402 /* First get the min lane# when low rate is used according to pixel clock
 403  * (prefer low rate), second check max lane# supported by DP panel,
 404  * if the max lane# < low rate lane# then use max lane# instead.
 405  */
 406 static int radeon_dp_get_dp_lane_number(struct drm_connector *connector,
 407                                         u8 dpcd[DP_DPCD_SIZE],
 408                                         int pix_clock)
 409 {
 410         int bpp = convert_bpc_to_bpp(radeon_get_monitor_bpc(connector));
 411         int max_link_rate = radeon_dp_get_max_link_rate(connector, dpcd);
 412         int max_lane_num = drm_dp_max_lane_count(dpcd);
 413         int lane_num;
 414         int max_dp_pix_clock;
 415
 416         for (lane_num = 1; lane_num < max_lane_num; lane_num <<= 1) {
 417                 max_dp_pix_clock = dp_get_max_dp_pix_clock(max_link_rate, lane_num, bpp);
 418                 if (pix_clock <= max_dp_pix_clock)
 419                         break;
 420         }
 421
 422         return lane_num;
 423 }
 424
 425 static int radeon_dp_get_dp_link_clock(struct drm_connector *connector,
 426                                        u8 dpcd[DP_DPCD_SIZE],
 427                                        int pix_clock)
 428 {
 429         int bpp = convert_bpc_to_bpp(radeon_get_monitor_bpc(connector));
 430         int lane_num, max_pix_clock;
 431
 432         if (radeon_connector_encoder_get_dp_bridge_encoder_id(connector) ==
 433             ENCODER_OBJECT_ID_NUTMEG)
 434                 return 270000;
 435
 436         lane_num = radeon_dp_get_dp_lane_number(connector, dpcd, pix_clock);
 437         max_pix_clock = dp_get_max_dp_pix_clock(162000, lane_num, bpp);
 438         if (pix_clock <= max_pix_clock)
 439                 return 162000;
 440         max_pix_clock = dp_get_max_dp_pix_clock(270000, lane_num, bpp);
 441         if (pix_clock <= max_pix_clock)
 442                 return 270000;
 443         if (radeon_connector_is_dp12_capable(connector)) {
 444                 max_pix_clock = dp_get_max_dp_pix_clock(540000, lane_num, bpp);
 445                 if (pix_clock <= max_pix_clock)
 446                         return 540000;
 447         }
 448
 449         return radeon_dp_get_max_link_rate(connector, dpcd);
 450 }
 451
 452 static u8 radeon_dp_encoder_service(struct radeon_device *rdev,
 453                                     int action, int dp_clock,
 454                                     u8 ucconfig, u8 lane_num)
 455 {
 456         DP_ENCODER_SERVICE_PARAMETERS args;
 457         int index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
 458
 459         memset(&args, 0, sizeof(args));
 460         args.ucLinkClock = dp_clock / 10;
 461         args.ucConfig = ucconfig;
 462         args.ucAction = action;
 463         args.ucLaneNum = lane_num;
 464         args.ucStatus = 0;
 465
 466         atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
 467         return args.ucStatus;
 468 }
 469
 470 u8 radeon_dp_getsinktype(struct radeon_connector *radeon_connector)
 471 {
 472         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 473         struct drm_device *dev = radeon_connector->base.dev;
 474         struct radeon_device *rdev = dev->dev_private;
 475
 476         return radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_GET_SINK_TYPE, 0,
 477                                          dig_connector->dp_i2c_bus->rec.i2c_id, 0);
 478 }
 479
 480 static void radeon_dp_probe_oui(struct radeon_connector *radeon_connector)
 481 {
 482         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 483         u8 buf[3];
 484
 485         if (!(dig_connector->dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT))
 486                 return;
 487
 488         if (radeon_dp_aux_native_read(radeon_connector, DP_SINK_OUI, buf, 3, 0))
 489                 DRM_DEBUG_KMS("Sink OUI: %02hx%02hx%02hx\n",
 490                               buf[0], buf[1], buf[2]);
 491
 492         if (radeon_dp_aux_native_read(radeon_connector, DP_BRANCH_OUI, buf, 3, 0))
 493                 DRM_DEBUG_KMS("Branch OUI: %02hx%02hx%02hx\n",
 494                               buf[0], buf[1], buf[2]);
 495 }
 496
 497 bool radeon_dp_getdpcd(struct radeon_connector *radeon_connector)
 498 {
 499         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 500         u8 msg[DP_DPCD_SIZE];
 501         int ret, i;
 502
 503         ret = radeon_dp_aux_native_read(radeon_connector, DP_DPCD_REV, msg,
 504                                         DP_DPCD_SIZE, 0);
 505         if (ret > 0) {
 506                 memcpy(dig_connector->dpcd, msg, DP_DPCD_SIZE);
 507                 DRM_DEBUG_KMS("DPCD: ");
 508                 for (i = 0; i < DP_DPCD_SIZE; i++)
 509                         DRM_DEBUG_KMS("%02x ", msg[i]);
 510                 DRM_DEBUG_KMS("\n");
 511
 512                 radeon_dp_probe_oui(radeon_connector);
 513
 514                 return true;
 515         }
 516         dig_connector->dpcd[0] = 0;
 517         return false;
 518 }
 519
 520 int radeon_dp_get_panel_mode(struct drm_encoder *encoder,
 521                              struct drm_connector *connector)
 522 {
 523         struct drm_device *dev = encoder->dev;
 524         struct radeon_device *rdev = dev->dev_private;
 525         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 526         int panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
 527         u16 dp_bridge = radeon_connector_encoder_get_dp_bridge_encoder_id(connector);
 528         u8 tmp;
 529
 530         if (!ASIC_IS_DCE4(rdev))
 531                 return panel_mode;
 532
 533         if (dp_bridge != ENCODER_OBJECT_ID_NONE) {
 534                 /* DP bridge chips */
 535                 tmp = radeon_read_dpcd_reg(radeon_connector, DP_EDP_CONFIGURATION_CAP);
 536                 if (tmp & 1)
 537                         panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
 538                 else if ((dp_bridge == ENCODER_OBJECT_ID_NUTMEG) ||
 539                          (dp_bridge == ENCODER_OBJECT_ID_TRAVIS))
 540                         panel_mode = DP_PANEL_MODE_INTERNAL_DP1_MODE;
 541                 else
 542                         panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
 543         } else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
 544                 /* eDP */
 545                 tmp = radeon_read_dpcd_reg(radeon_connector, DP_EDP_CONFIGURATION_CAP);
 546                 if (tmp & 1)
 547                         panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
 548         }
 549
 550         return panel_mode;
 551 }
 552
 553 void radeon_dp_set_link_config(struct drm_connector *connector,
 554                                const struct drm_display_mode *mode)
 555 {
 556         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 557         struct radeon_connector_atom_dig *dig_connector;
 558
 559         if (!radeon_connector->con_priv)
 560                 return;
 561         dig_connector = radeon_connector->con_priv;
 562
 563         if ((dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) ||
 564             (dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_eDP)) {
 565                 dig_connector->dp_clock =
 566                         radeon_dp_get_dp_link_clock(connector, dig_connector->dpcd, mode->clock);
 567                 dig_connector->dp_lane_count =
 568                         radeon_dp_get_dp_lane_number(connector, dig_connector->dpcd, mode->clock);
 569         }
 570 }
 571
 572 int radeon_dp_mode_valid_helper(struct drm_connector *connector,
 573                                 struct drm_display_mode *mode)
 574 {
 575         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 576         struct radeon_connector_atom_dig *dig_connector;
 577         int dp_clock;
 578
 579         if (!radeon_connector->con_priv)
 580                 return MODE_CLOCK_HIGH;
 581         dig_connector = radeon_connector->con_priv;
 582
 583         dp_clock =
 584                 radeon_dp_get_dp_link_clock(connector, dig_connector->dpcd, mode->clock);
 585
 586         if ((dp_clock == 540000) &&
 587             (!radeon_connector_is_dp12_capable(connector)))
 588                 return MODE_CLOCK_HIGH;
 589
 590         return MODE_OK;
 591 }
 592
 593 static bool radeon_dp_get_link_status(struct radeon_connector *radeon_connector,
 594                                       u8 link_status[DP_LINK_STATUS_SIZE])
 595 {
 596         int ret;
 597         ret = radeon_dp_aux_native_read(radeon_connector, DP_LANE0_1_STATUS,
 598                                         link_status, DP_LINK_STATUS_SIZE, 100);
 599         if (ret <= 0) {
 600                 return false;
 601         }
 602
 603         DRM_DEBUG_KMS("link status %6ph\n", link_status);
 604         return true;
 605 }
 606
 607 bool radeon_dp_needs_link_train(struct radeon_connector *radeon_connector)
 608 {
 609         u8 link_status[DP_LINK_STATUS_SIZE];
 610         struct radeon_connector_atom_dig *dig = radeon_connector->con_priv;
 611
 612         if (!radeon_dp_get_link_status(radeon_connector, link_status))
 613                 return false;
 614         if (drm_dp_channel_eq_ok(link_status, dig->dp_lane_count))
 615                 return false;
 616         return true;
 617 }
 618
 619 struct radeon_dp_link_train_info {
 620         struct radeon_device *rdev;
 621         struct drm_encoder *encoder;
 622         struct drm_connector *connector;
 623         struct radeon_connector *radeon_connector;
 624         int enc_id;
 625         int dp_clock;
 626         int dp_lane_count;
 627         bool tp3_supported;
 628         u8 dpcd[DP_RECEIVER_CAP_SIZE];
 629         u8 train_set[4];
 630         u8 link_status[DP_LINK_STATUS_SIZE];
 631         u8 tries;
 632         bool use_dpencoder;
 633 };
 634
 635 static void radeon_dp_update_vs_emph(struct radeon_dp_link_train_info *dp_info)
 636 {
 637         /* set the initial vs/emph on the source */
 638         atombios_dig_transmitter_setup(dp_info->encoder,
 639                                        ATOM_TRANSMITTER_ACTION_SETUP_VSEMPH,
 640                                        0, dp_info->train_set[0]); /* sets all lanes at once */
 641
 642         /* set the vs/emph on the sink */
 643         radeon_dp_aux_native_write(dp_info->radeon_connector, DP_TRAINING_LANE0_SET,
 644                                    dp_info->train_set, dp_info->dp_lane_count, 0);
 645 }
 646
 647 static void radeon_dp_set_tp(struct radeon_dp_link_train_info *dp_info, int tp)
 648 {
 649         int rtp = 0;
 650
 651         /* set training pattern on the source */
 652         if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder) {
 653                 switch (tp) {
 654                 case DP_TRAINING_PATTERN_1:
 655                         rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN1;
 656                         break;
 657                 case DP_TRAINING_PATTERN_2:
 658                         rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN2;
 659                         break;
 660                 case DP_TRAINING_PATTERN_3:
 661                         rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN3;
 662                         break;
 663                 }
 664                 atombios_dig_encoder_setup(dp_info->encoder, rtp, 0);
 665         } else {
 666                 switch (tp) {
 667                 case DP_TRAINING_PATTERN_1:
 668                         rtp = 0;
 669                         break;
 670                 case DP_TRAINING_PATTERN_2:
 671                         rtp = 1;
 672                         break;
 673                 }
 674                 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_PATTERN_SEL,
 675                                           dp_info->dp_clock, dp_info->enc_id, rtp);
 676         }
 677
 678         /* enable training pattern on the sink */
 679         radeon_write_dpcd_reg(dp_info->radeon_connector, DP_TRAINING_PATTERN_SET, tp);
 680 }
 681
 682 static int radeon_dp_link_train_init(struct radeon_dp_link_train_info *dp_info)
 683 {
 684         struct radeon_encoder *radeon_encoder = to_radeon_encoder(dp_info->encoder);
 685         struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
 686         u8 tmp;
 687
 688         /* power up the sink */
 689         if (dp_info->dpcd[0] >= 0x11) {
 690                 radeon_write_dpcd_reg(dp_info->radeon_connector,
 691                                       DP_SET_POWER, DP_SET_POWER_D0);
 692                 usleep_range(1000, 2000);
 693         }
 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 (drm_dp_enhanced_frame_cap(dp_info->dpcd))
 711                 tmp |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
 712         radeon_write_dpcd_reg(dp_info->radeon_connector, DP_LANE_COUNT_SET, tmp);
 713
 714         /* set the link rate on the sink */
 715         tmp = drm_dp_link_rate_to_bw_code(dp_info->dp_clock);
 716         radeon_write_dpcd_reg(dp_info->radeon_connector, DP_LINK_BW_SET, tmp);
 717
 718         /* start training on the source */
 719         if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder)
 720                 atombios_dig_encoder_setup(dp_info->encoder,
 721                                            ATOM_ENCODER_CMD_DP_LINK_TRAINING_START, 0);
 722         else
 723                 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_START,
 724                                           dp_info->dp_clock, dp_info->enc_id, 0);
 725
 726         /* disable the training pattern on the sink */
 727         radeon_write_dpcd_reg(dp_info->radeon_connector,
 728                               DP_TRAINING_PATTERN_SET,
 729                               DP_TRAINING_PATTERN_DISABLE);
 730
 731         return 0;
 732 }
 733
 734 static int radeon_dp_link_train_finish(struct radeon_dp_link_train_info *dp_info)
 735 {
 736         udelay(400);
 737
 738         /* disable the training pattern on the sink */
 739         radeon_write_dpcd_reg(dp_info->radeon_connector,
 740                               DP_TRAINING_PATTERN_SET,
 741                               DP_TRAINING_PATTERN_DISABLE);
 742
 743         /* disable the training pattern on the source */
 744         if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder)
 745                 atombios_dig_encoder_setup(dp_info->encoder,
 746                                            ATOM_ENCODER_CMD_DP_LINK_TRAINING_COMPLETE, 0);
 747         else
 748                 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_COMPLETE,
 749                                           dp_info->dp_clock, dp_info->enc_id, 0);
 750
 751         return 0;
 752 }
 753
 754 static int radeon_dp_link_train_cr(struct radeon_dp_link_train_info *dp_info)
 755 {
 756         bool clock_recovery;
 757         u8 voltage;
 758         int i;
 759
 760         radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_1);
 761         memset(dp_info->train_set, 0, 4);
 762         radeon_dp_update_vs_emph(dp_info);
 763
 764         udelay(400);
 765
 766         /* clock recovery loop */
 767         clock_recovery = false;
 768         dp_info->tries = 0;
 769         voltage = 0xff;
 770         while (1) {
 771                 drm_dp_link_train_clock_recovery_delay(dp_info->dpcd);
 772
 773                 if (!radeon_dp_get_link_status(dp_info->radeon_connector, dp_info->link_status)) {
 774                         DRM_ERROR("displayport link status failed\n");
 775                         break;
 776                 }
 777
 778                 if (drm_dp_clock_recovery_ok(dp_info->link_status, dp_info->dp_lane_count)) {
 779                         clock_recovery = true;
 780                         break;
 781                 }
 782
 783                 for (i = 0; i < dp_info->dp_lane_count; i++) {
 784                         if ((dp_info->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
 785                                 break;
 786                 }
 787                 if (i == dp_info->dp_lane_count) {
 788                         DRM_ERROR("clock recovery reached max voltage\n");
 789                         break;
 790                 }
 791
 792                 if ((dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
 793                         ++dp_info->tries;
 794                         if (dp_info->tries == 5) {
 795                                 DRM_ERROR("clock recovery tried 5 times\n");
 796                                 break;
 797                         }
 798                 } else
 799                         dp_info->tries = 0;
 800
 801                 voltage = dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
 802
 803                 /* Compute new train_set as requested by sink */
 804                 dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, dp_info->train_set);
 805
 806                 radeon_dp_update_vs_emph(dp_info);
 807         }
 808         if (!clock_recovery) {
 809                 DRM_ERROR("clock recovery failed\n");
 810                 return -1;
 811         } else {
 812                 DRM_DEBUG_KMS("clock recovery at voltage %d pre-emphasis %d\n",
 813                           dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
 814                           (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) >>
 815                           DP_TRAIN_PRE_EMPHASIS_SHIFT);
 816                 return 0;
 817         }
 818 }
 819
 820 static int radeon_dp_link_train_ce(struct radeon_dp_link_train_info *dp_info)
 821 {
 822         bool channel_eq;
 823
 824         if (dp_info->tp3_supported)
 825                 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_3);
 826         else
 827                 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_2);
 828
 829         /* channel equalization loop */
 830         dp_info->tries = 0;
 831         channel_eq = false;
 832         while (1) {
 833                 drm_dp_link_train_channel_eq_delay(dp_info->dpcd);
 834
 835                 if (!radeon_dp_get_link_status(dp_info->radeon_connector, dp_info->link_status)) {
 836                         DRM_ERROR("displayport link status failed\n");
 837                         break;
 838                 }
 839
 840                 if (drm_dp_channel_eq_ok(dp_info->link_status, dp_info->dp_lane_count)) {
 841                         channel_eq = true;
 842                         break;
 843                 }
 844
 845                 /* Try 5 times */
 846                 if (dp_info->tries > 5) {
 847                         DRM_ERROR("channel eq failed: 5 tries\n");
 848                         break;
 849                 }
 850
 851                 /* Compute new train_set as requested by sink */
 852                 dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, dp_info->train_set);
 853
 854                 radeon_dp_update_vs_emph(dp_info);
 855                 dp_info->tries++;
 856         }
 857
 858         if (!channel_eq) {
 859                 DRM_ERROR("channel eq failed\n");
 860                 return -1;
 861         } else {
 862                 DRM_DEBUG_KMS("channel eq at voltage %d pre-emphasis %d\n",
 863                           dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK,
 864                           (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK)
 865                           >> DP_TRAIN_PRE_EMPHASIS_SHIFT);
 866                 return 0;
 867         }
 868 }
 869
 870 void radeon_dp_link_train(struct drm_encoder *encoder,
 871                           struct drm_connector *connector)
 872 {
 873         struct drm_device *dev = encoder->dev;
 874         struct radeon_device *rdev = dev->dev_private;
 875         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 876         struct radeon_encoder_atom_dig *dig;
 877         struct radeon_connector *radeon_connector;
 878         struct radeon_connector_atom_dig *dig_connector;
 879         struct radeon_dp_link_train_info dp_info;
 880         int index;
 881         u8 tmp, frev, crev;
 882
 883         if (!radeon_encoder->enc_priv)
 884                 return;
 885         dig = radeon_encoder->enc_priv;
 886
 887         radeon_connector = to_radeon_connector(connector);
 888         if (!radeon_connector->con_priv)
 889                 return;
 890         dig_connector = radeon_connector->con_priv;
 891
 892         if ((dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_DISPLAYPORT) &&
 893             (dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_eDP))
 894                 return;
 895
 896         /* DPEncoderService newer than 1.1 can't program properly the
 897          * training pattern. When facing such version use the
 898          * DIGXEncoderControl (X== 1 | 2)
 899          */
 900         dp_info.use_dpencoder = true;
 901         index = GetIndexIntoMasterTable(COMMAND, DPEncoderService);
 902         if (atom_parse_cmd_header(rdev->mode_info.atom_context, index, &frev, &crev)) {
 903                 if (crev > 1) {
 904                         dp_info.use_dpencoder = false;
 905                 }
 906         }
 907
 908         dp_info.enc_id = 0;
 909         if (dig->dig_encoder)
 910                 dp_info.enc_id |= ATOM_DP_CONFIG_DIG2_ENCODER;
 911         else
 912                 dp_info.enc_id |= ATOM_DP_CONFIG_DIG1_ENCODER;
 913         if (dig->linkb)
 914                 dp_info.enc_id |= ATOM_DP_CONFIG_LINK_B;
 915         else
 916                 dp_info.enc_id |= ATOM_DP_CONFIG_LINK_A;
 917
 918         tmp = radeon_read_dpcd_reg(radeon_connector, DP_MAX_LANE_COUNT);
 919         if (ASIC_IS_DCE5(rdev) && (tmp & DP_TPS3_SUPPORTED))
 920                 dp_info.tp3_supported = true;
 921         else
 922                 dp_info.tp3_supported = false;
 923
 924         memcpy(dp_info.dpcd, dig_connector->dpcd, DP_RECEIVER_CAP_SIZE);
 925         dp_info.rdev = rdev;
 926         dp_info.encoder = encoder;
 927         dp_info.connector = connector;
 928         dp_info.radeon_connector = radeon_connector;
 929         dp_info.dp_lane_count = dig_connector->dp_lane_count;
 930         dp_info.dp_clock = dig_connector->dp_clock;
 931
 932         if (radeon_dp_link_train_init(&dp_info))
 933                 goto done;
 934         if (radeon_dp_link_train_cr(&dp_info))
 935                 goto done;
 936         if (radeon_dp_link_train_ce(&dp_info))
 937                 goto done;
 938 done:
 939         if (radeon_dp_link_train_finish(&dp_info))
 940                 return;
 941 }