1 /* 2 * Copyright 2007-8 Advanced Micro Devices, Inc. 3 * Copyright 2008 Red Hat Inc. 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining a 6 * copy of this software and associated documentation files (the "Software"), 7 * to deal in the Software without restriction, including without limitation 8 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 9 * and/or sell copies of the Software, and to permit persons to whom the 10 * Software is furnished to do so, subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice shall be included in 13 * all copies or substantial portions of the Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 21 * OTHER DEALINGS IN THE SOFTWARE. 22 * 23 * Authors: Dave Airlie 24 * Alex Deucher 25 * Jerome Glisse 26 */ 27 28 #include <drm/amdgpu_drm.h> 29 #include <drm/display/drm_dp_helper.h> 30 31 #include "amdgpu.h" 32 33 #include "atom.h" 34 #include "atom-bits.h" 35 #include "atombios_encoders.h" 36 #include "atombios_dp.h" 37 #include "amdgpu_connectors.h" 38 #include "amdgpu_atombios.h" 39 40 /* move these to drm_dp_helper.c/h */ 41 #define DP_LINK_CONFIGURATION_SIZE 9 42 #define DP_DPCD_SIZE DP_RECEIVER_CAP_SIZE 43 44 static char *voltage_names[] = { 45 "0.4V", "0.6V", "0.8V", "1.2V" 46 }; 47 static char *pre_emph_names[] = { 48 "0dB", "3.5dB", "6dB", "9.5dB" 49 }; 50 51 /***** amdgpu AUX functions *****/ 52 53 union aux_channel_transaction { 54 PROCESS_AUX_CHANNEL_TRANSACTION_PS_ALLOCATION v1; 55 PROCESS_AUX_CHANNEL_TRANSACTION_PARAMETERS_V2 v2; 56 }; 57 58 static int amdgpu_atombios_dp_process_aux_ch(struct amdgpu_i2c_chan *chan, 59 u8 *send, int send_bytes, 60 u8 *recv, int recv_size, 61 u8 delay, u8 *ack) 62 { 63 struct drm_device *dev = chan->dev; 64 struct amdgpu_device *adev = drm_to_adev(dev); 65 union aux_channel_transaction args; 66 int index = GetIndexIntoMasterTable(COMMAND, ProcessAuxChannelTransaction); 67 unsigned char *base; 68 int recv_bytes; 69 int r = 0; 70 71 memset(&args, 0, sizeof(args)); 72 73 mutex_lock(&chan->mutex); 74 75 base = (unsigned char *)(adev->mode_info.atom_context->scratch + 1); 76 77 amdgpu_atombios_copy_swap(base, send, send_bytes, true); 78 79 args.v2.lpAuxRequest = cpu_to_le16((u16)(0 + 4)); 80 args.v2.lpDataOut = cpu_to_le16((u16)(16 + 4)); 81 args.v2.ucDataOutLen = 0; 82 args.v2.ucChannelID = chan->rec.i2c_id; 83 args.v2.ucDelay = delay / 10; 84 args.v2.ucHPD_ID = chan->rec.hpd; 85 86 amdgpu_atom_execute_table(adev->mode_info.atom_context, index, (uint32_t *)&args, sizeof(args)); 87 88 *ack = args.v2.ucReplyStatus; 89 90 /* timeout */ 91 if (args.v2.ucReplyStatus == 1) { 92 r = -ETIMEDOUT; 93 goto done; 94 } 95 96 /* flags not zero */ 97 if (args.v2.ucReplyStatus == 2) { 98 DRM_DEBUG_KMS("dp_aux_ch flags not zero\n"); 99 r = -EIO; 100 goto done; 101 } 102 103 /* error */ 104 if (args.v2.ucReplyStatus == 3) { 105 DRM_DEBUG_KMS("dp_aux_ch error\n"); 106 r = -EIO; 107 goto done; 108 } 109 110 recv_bytes = args.v1.ucDataOutLen; 111 if (recv_bytes > recv_size) 112 recv_bytes = recv_size; 113 114 if (recv && recv_size) 115 amdgpu_atombios_copy_swap(recv, base + 16, recv_bytes, false); 116 117 r = recv_bytes; 118 done: 119 mutex_unlock(&chan->mutex); 120 121 return r; 122 } 123 124 #define BARE_ADDRESS_SIZE 3 125 #define HEADER_SIZE (BARE_ADDRESS_SIZE + 1) 126 127 static ssize_t 128 amdgpu_atombios_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg) 129 { 130 struct amdgpu_i2c_chan *chan = 131 container_of(aux, struct amdgpu_i2c_chan, aux); 132 int ret; 133 u8 tx_buf[20]; 134 size_t tx_size; 135 u8 ack, delay = 0; 136 137 if (WARN_ON(msg->size > 16)) 138 return -E2BIG; 139 140 tx_buf[0] = msg->address & 0xff; 141 tx_buf[1] = msg->address >> 8; 142 tx_buf[2] = (msg->request << 4) | 143 ((msg->address >> 16) & 0xf); 144 tx_buf[3] = msg->size ? (msg->size - 1) : 0; 145 146 switch (msg->request & ~DP_AUX_I2C_MOT) { 147 case DP_AUX_NATIVE_WRITE: 148 case DP_AUX_I2C_WRITE: 149 /* tx_size needs to be 4 even for bare address packets since the atom 150 * table needs the info in tx_buf[3]. 151 */ 152 tx_size = HEADER_SIZE + msg->size; 153 if (msg->size == 0) 154 tx_buf[3] |= BARE_ADDRESS_SIZE << 4; 155 else 156 tx_buf[3] |= tx_size << 4; 157 memcpy(tx_buf + HEADER_SIZE, msg->buffer, msg->size); 158 ret = amdgpu_atombios_dp_process_aux_ch(chan, 159 tx_buf, tx_size, NULL, 0, delay, &ack); 160 if (ret >= 0) 161 /* Return payload size. */ 162 ret = msg->size; 163 break; 164 case DP_AUX_NATIVE_READ: 165 case DP_AUX_I2C_READ: 166 /* tx_size needs to be 4 even for bare address packets since the atom 167 * table needs the info in tx_buf[3]. 168 */ 169 tx_size = HEADER_SIZE; 170 if (msg->size == 0) 171 tx_buf[3] |= BARE_ADDRESS_SIZE << 4; 172 else 173 tx_buf[3] |= tx_size << 4; 174 ret = amdgpu_atombios_dp_process_aux_ch(chan, 175 tx_buf, tx_size, msg->buffer, msg->size, delay, &ack); 176 break; 177 default: 178 ret = -EINVAL; 179 break; 180 } 181 182 if (ret >= 0) 183 msg->reply = ack >> 4; 184 185 return ret; 186 } 187 188 void amdgpu_atombios_dp_aux_init(struct amdgpu_connector *amdgpu_connector) 189 { 190 amdgpu_connector->ddc_bus->rec.hpd = amdgpu_connector->hpd.hpd; 191 amdgpu_connector->ddc_bus->aux.transfer = amdgpu_atombios_dp_aux_transfer; 192 amdgpu_connector->ddc_bus->aux.drm_dev = amdgpu_connector->base.dev; 193 194 drm_dp_aux_init(&amdgpu_connector->ddc_bus->aux); 195 amdgpu_connector->ddc_bus->has_aux = true; 196 } 197 198 /***** general DP utility functions *****/ 199 200 #define DP_VOLTAGE_MAX DP_TRAIN_VOLTAGE_SWING_LEVEL_3 201 #define DP_PRE_EMPHASIS_MAX DP_TRAIN_PRE_EMPH_LEVEL_3 202 203 static void amdgpu_atombios_dp_get_adjust_train(const u8 link_status[DP_LINK_STATUS_SIZE], 204 int lane_count, 205 u8 train_set[4]) 206 { 207 u8 v = 0; 208 u8 p = 0; 209 int lane; 210 211 for (lane = 0; lane < lane_count; lane++) { 212 u8 this_v = drm_dp_get_adjust_request_voltage(link_status, lane); 213 u8 this_p = drm_dp_get_adjust_request_pre_emphasis(link_status, lane); 214 215 DRM_DEBUG_KMS("requested signal parameters: lane %d voltage %s pre_emph %s\n", 216 lane, 217 voltage_names[this_v >> DP_TRAIN_VOLTAGE_SWING_SHIFT], 218 pre_emph_names[this_p >> DP_TRAIN_PRE_EMPHASIS_SHIFT]); 219 220 if (this_v > v) 221 v = this_v; 222 if (this_p > p) 223 p = this_p; 224 } 225 226 if (v >= DP_VOLTAGE_MAX) 227 v |= DP_TRAIN_MAX_SWING_REACHED; 228 229 if (p >= DP_PRE_EMPHASIS_MAX) 230 p |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED; 231 232 DRM_DEBUG_KMS("using signal parameters: voltage %s pre_emph %s\n", 233 voltage_names[(v & DP_TRAIN_VOLTAGE_SWING_MASK) >> DP_TRAIN_VOLTAGE_SWING_SHIFT], 234 pre_emph_names[(p & DP_TRAIN_PRE_EMPHASIS_MASK) >> DP_TRAIN_PRE_EMPHASIS_SHIFT]); 235 236 for (lane = 0; lane < 4; lane++) 237 train_set[lane] = v | p; 238 } 239 240 /* convert bits per color to bits per pixel */ 241 /* get bpc from the EDID */ 242 static unsigned amdgpu_atombios_dp_convert_bpc_to_bpp(int bpc) 243 { 244 if (bpc == 0) 245 return 24; 246 else 247 return bpc * 3; 248 } 249 250 /***** amdgpu specific DP functions *****/ 251 252 static int amdgpu_atombios_dp_get_dp_link_config(struct drm_connector *connector, 253 const u8 dpcd[DP_DPCD_SIZE], 254 unsigned pix_clock, 255 unsigned *dp_lanes, unsigned *dp_rate) 256 { 257 unsigned bpp = 258 amdgpu_atombios_dp_convert_bpc_to_bpp(amdgpu_connector_get_monitor_bpc(connector)); 259 static const unsigned link_rates[3] = { 162000, 270000, 540000 }; 260 unsigned max_link_rate = drm_dp_max_link_rate(dpcd); 261 unsigned max_lane_num = drm_dp_max_lane_count(dpcd); 262 unsigned lane_num, i, max_pix_clock; 263 264 if (amdgpu_connector_encoder_get_dp_bridge_encoder_id(connector) == 265 ENCODER_OBJECT_ID_NUTMEG) { 266 for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) { 267 max_pix_clock = (lane_num * 270000 * 8) / bpp; 268 if (max_pix_clock >= pix_clock) { 269 *dp_lanes = lane_num; 270 *dp_rate = 270000; 271 return 0; 272 } 273 } 274 } else { 275 for (i = 0; i < ARRAY_SIZE(link_rates) && link_rates[i] <= max_link_rate; i++) { 276 for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) { 277 max_pix_clock = (lane_num * link_rates[i] * 8) / bpp; 278 if (max_pix_clock >= pix_clock) { 279 *dp_lanes = lane_num; 280 *dp_rate = link_rates[i]; 281 return 0; 282 } 283 } 284 } 285 } 286 287 return -EINVAL; 288 } 289 290 static u8 amdgpu_atombios_dp_encoder_service(struct amdgpu_device *adev, 291 int action, int dp_clock, 292 u8 ucconfig, u8 lane_num) 293 { 294 DP_ENCODER_SERVICE_PARAMETERS args; 295 int index = GetIndexIntoMasterTable(COMMAND, DPEncoderService); 296 297 memset(&args, 0, sizeof(args)); 298 args.ucLinkClock = dp_clock / 10; 299 args.ucConfig = ucconfig; 300 args.ucAction = action; 301 args.ucLaneNum = lane_num; 302 args.ucStatus = 0; 303 304 amdgpu_atom_execute_table(adev->mode_info.atom_context, index, (uint32_t *)&args, sizeof(args)); 305 return args.ucStatus; 306 } 307 308 u8 amdgpu_atombios_dp_get_sinktype(struct amdgpu_connector *amdgpu_connector) 309 { 310 struct drm_device *dev = amdgpu_connector->base.dev; 311 struct amdgpu_device *adev = drm_to_adev(dev); 312 313 return amdgpu_atombios_dp_encoder_service(adev, ATOM_DP_ACTION_GET_SINK_TYPE, 0, 314 amdgpu_connector->ddc_bus->rec.i2c_id, 0); 315 } 316 317 static void amdgpu_atombios_dp_probe_oui(struct amdgpu_connector *amdgpu_connector) 318 { 319 struct amdgpu_connector_atom_dig *dig_connector = amdgpu_connector->con_priv; 320 u8 buf[3]; 321 322 if (!(dig_connector->dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT)) 323 return; 324 325 if (drm_dp_dpcd_read(&amdgpu_connector->ddc_bus->aux, DP_SINK_OUI, buf, 3) == 3) 326 DRM_DEBUG_KMS("Sink OUI: %02hx%02hx%02hx\n", 327 buf[0], buf[1], buf[2]); 328 329 if (drm_dp_dpcd_read(&amdgpu_connector->ddc_bus->aux, DP_BRANCH_OUI, buf, 3) == 3) 330 DRM_DEBUG_KMS("Branch OUI: %02hx%02hx%02hx\n", 331 buf[0], buf[1], buf[2]); 332 } 333 334 static void amdgpu_atombios_dp_ds_ports(struct amdgpu_connector *amdgpu_connector) 335 { 336 struct amdgpu_connector_atom_dig *dig_connector = amdgpu_connector->con_priv; 337 int ret; 338 339 if (dig_connector->dpcd[DP_DPCD_REV] > 0x10) { 340 ret = drm_dp_dpcd_read(&amdgpu_connector->ddc_bus->aux, 341 DP_DOWNSTREAM_PORT_0, 342 dig_connector->downstream_ports, 343 DP_MAX_DOWNSTREAM_PORTS); 344 if (ret) 345 memset(dig_connector->downstream_ports, 0, 346 DP_MAX_DOWNSTREAM_PORTS); 347 } 348 } 349 350 int amdgpu_atombios_dp_get_dpcd(struct amdgpu_connector *amdgpu_connector) 351 { 352 struct amdgpu_connector_atom_dig *dig_connector = amdgpu_connector->con_priv; 353 u8 msg[DP_DPCD_SIZE]; 354 int ret; 355 356 ret = drm_dp_dpcd_read(&amdgpu_connector->ddc_bus->aux, DP_DPCD_REV, 357 msg, DP_DPCD_SIZE); 358 if (ret == DP_DPCD_SIZE) { 359 memcpy(dig_connector->dpcd, msg, DP_DPCD_SIZE); 360 361 DRM_DEBUG_KMS("DPCD: %*ph\n", (int)sizeof(dig_connector->dpcd), 362 dig_connector->dpcd); 363 364 amdgpu_atombios_dp_probe_oui(amdgpu_connector); 365 amdgpu_atombios_dp_ds_ports(amdgpu_connector); 366 return 0; 367 } 368 369 dig_connector->dpcd[0] = 0; 370 return -EINVAL; 371 } 372 373 int amdgpu_atombios_dp_get_panel_mode(struct drm_encoder *encoder, 374 struct drm_connector *connector) 375 { 376 struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector); 377 int panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE; 378 u16 dp_bridge = amdgpu_connector_encoder_get_dp_bridge_encoder_id(connector); 379 u8 tmp; 380 381 if (!amdgpu_connector->con_priv) 382 return panel_mode; 383 384 if (dp_bridge != ENCODER_OBJECT_ID_NONE) { 385 /* DP bridge chips */ 386 if (drm_dp_dpcd_readb(&amdgpu_connector->ddc_bus->aux, 387 DP_EDP_CONFIGURATION_CAP, &tmp) == 1) { 388 if (tmp & 1) 389 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE; 390 else if ((dp_bridge == ENCODER_OBJECT_ID_NUTMEG) || 391 (dp_bridge == ENCODER_OBJECT_ID_TRAVIS)) 392 panel_mode = DP_PANEL_MODE_INTERNAL_DP1_MODE; 393 else 394 panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE; 395 } 396 } else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) { 397 /* eDP */ 398 if (drm_dp_dpcd_readb(&amdgpu_connector->ddc_bus->aux, 399 DP_EDP_CONFIGURATION_CAP, &tmp) == 1) { 400 if (tmp & 1) 401 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE; 402 } 403 } 404 405 return panel_mode; 406 } 407 408 void amdgpu_atombios_dp_set_link_config(struct drm_connector *connector, 409 const struct drm_display_mode *mode) 410 { 411 struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector); 412 struct amdgpu_connector_atom_dig *dig_connector; 413 int ret; 414 415 if (!amdgpu_connector->con_priv) 416 return; 417 dig_connector = amdgpu_connector->con_priv; 418 419 if ((dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) || 420 (dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_eDP)) { 421 ret = amdgpu_atombios_dp_get_dp_link_config(connector, dig_connector->dpcd, 422 mode->clock, 423 &dig_connector->dp_lane_count, 424 &dig_connector->dp_clock); 425 if (ret) { 426 dig_connector->dp_clock = 0; 427 dig_connector->dp_lane_count = 0; 428 } 429 } 430 } 431 432 int amdgpu_atombios_dp_mode_valid_helper(struct drm_connector *connector, 433 struct drm_display_mode *mode) 434 { 435 struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector); 436 struct amdgpu_connector_atom_dig *dig_connector; 437 unsigned dp_lanes, dp_clock; 438 int ret; 439 440 if (!amdgpu_connector->con_priv) 441 return MODE_CLOCK_HIGH; 442 dig_connector = amdgpu_connector->con_priv; 443 444 ret = amdgpu_atombios_dp_get_dp_link_config(connector, dig_connector->dpcd, 445 mode->clock, &dp_lanes, &dp_clock); 446 if (ret) 447 return MODE_CLOCK_HIGH; 448 449 if ((dp_clock == 540000) && 450 (!amdgpu_connector_is_dp12_capable(connector))) 451 return MODE_CLOCK_HIGH; 452 453 return MODE_OK; 454 } 455 456 bool amdgpu_atombios_dp_needs_link_train(struct amdgpu_connector *amdgpu_connector) 457 { 458 u8 link_status[DP_LINK_STATUS_SIZE]; 459 struct amdgpu_connector_atom_dig *dig = amdgpu_connector->con_priv; 460 461 if (drm_dp_dpcd_read_link_status(&amdgpu_connector->ddc_bus->aux, link_status) 462 <= 0) 463 return false; 464 if (drm_dp_channel_eq_ok(link_status, dig->dp_lane_count)) 465 return false; 466 return true; 467 } 468 469 void amdgpu_atombios_dp_set_rx_power_state(struct drm_connector *connector, 470 u8 power_state) 471 { 472 struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector); 473 struct amdgpu_connector_atom_dig *dig_connector; 474 475 if (!amdgpu_connector->con_priv) 476 return; 477 478 dig_connector = amdgpu_connector->con_priv; 479 480 /* power up/down the sink */ 481 if (dig_connector->dpcd[0] >= 0x11) { 482 drm_dp_dpcd_writeb(&amdgpu_connector->ddc_bus->aux, 483 DP_SET_POWER, power_state); 484 usleep_range(1000, 2000); 485 } 486 } 487 488 struct amdgpu_atombios_dp_link_train_info { 489 struct amdgpu_device *adev; 490 struct drm_encoder *encoder; 491 struct drm_connector *connector; 492 int dp_clock; 493 int dp_lane_count; 494 bool tp3_supported; 495 u8 dpcd[DP_RECEIVER_CAP_SIZE]; 496 u8 train_set[4]; 497 u8 link_status[DP_LINK_STATUS_SIZE]; 498 u8 tries; 499 struct drm_dp_aux *aux; 500 }; 501 502 static void 503 amdgpu_atombios_dp_update_vs_emph(struct amdgpu_atombios_dp_link_train_info *dp_info) 504 { 505 /* set the initial vs/emph on the source */ 506 amdgpu_atombios_encoder_setup_dig_transmitter(dp_info->encoder, 507 ATOM_TRANSMITTER_ACTION_SETUP_VSEMPH, 508 0, dp_info->train_set[0]); /* sets all lanes at once */ 509 510 /* set the vs/emph on the sink */ 511 drm_dp_dpcd_write(dp_info->aux, DP_TRAINING_LANE0_SET, 512 dp_info->train_set, dp_info->dp_lane_count); 513 } 514 515 static void 516 amdgpu_atombios_dp_set_tp(struct amdgpu_atombios_dp_link_train_info *dp_info, int tp) 517 { 518 int rtp = 0; 519 520 /* set training pattern on the source */ 521 switch (tp) { 522 case DP_TRAINING_PATTERN_1: 523 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN1; 524 break; 525 case DP_TRAINING_PATTERN_2: 526 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN2; 527 break; 528 case DP_TRAINING_PATTERN_3: 529 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN3; 530 break; 531 } 532 amdgpu_atombios_encoder_setup_dig_encoder(dp_info->encoder, rtp, 0); 533 534 /* enable training pattern on the sink */ 535 drm_dp_dpcd_writeb(dp_info->aux, DP_TRAINING_PATTERN_SET, tp); 536 } 537 538 static int 539 amdgpu_atombios_dp_link_train_init(struct amdgpu_atombios_dp_link_train_info *dp_info) 540 { 541 struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(dp_info->encoder); 542 struct amdgpu_encoder_atom_dig *dig = amdgpu_encoder->enc_priv; 543 u8 tmp; 544 545 /* power up the sink */ 546 amdgpu_atombios_dp_set_rx_power_state(dp_info->connector, DP_SET_POWER_D0); 547 548 /* possibly enable downspread on the sink */ 549 if (dp_info->dpcd[3] & 0x1) 550 drm_dp_dpcd_writeb(dp_info->aux, 551 DP_DOWNSPREAD_CTRL, DP_SPREAD_AMP_0_5); 552 else 553 drm_dp_dpcd_writeb(dp_info->aux, 554 DP_DOWNSPREAD_CTRL, 0); 555 556 if (dig->panel_mode == DP_PANEL_MODE_INTERNAL_DP2_MODE) 557 drm_dp_dpcd_writeb(dp_info->aux, DP_EDP_CONFIGURATION_SET, 1); 558 559 /* set the lane count on the sink */ 560 tmp = dp_info->dp_lane_count; 561 if (drm_dp_enhanced_frame_cap(dp_info->dpcd)) 562 tmp |= DP_LANE_COUNT_ENHANCED_FRAME_EN; 563 drm_dp_dpcd_writeb(dp_info->aux, DP_LANE_COUNT_SET, tmp); 564 565 /* set the link rate on the sink */ 566 tmp = drm_dp_link_rate_to_bw_code(dp_info->dp_clock); 567 drm_dp_dpcd_writeb(dp_info->aux, DP_LINK_BW_SET, tmp); 568 569 /* start training on the source */ 570 amdgpu_atombios_encoder_setup_dig_encoder(dp_info->encoder, 571 ATOM_ENCODER_CMD_DP_LINK_TRAINING_START, 0); 572 573 /* disable the training pattern on the sink */ 574 drm_dp_dpcd_writeb(dp_info->aux, 575 DP_TRAINING_PATTERN_SET, 576 DP_TRAINING_PATTERN_DISABLE); 577 578 return 0; 579 } 580 581 static int 582 amdgpu_atombios_dp_link_train_finish(struct amdgpu_atombios_dp_link_train_info *dp_info) 583 { 584 udelay(400); 585 586 /* disable the training pattern on the sink */ 587 drm_dp_dpcd_writeb(dp_info->aux, 588 DP_TRAINING_PATTERN_SET, 589 DP_TRAINING_PATTERN_DISABLE); 590 591 /* disable the training pattern on the source */ 592 amdgpu_atombios_encoder_setup_dig_encoder(dp_info->encoder, 593 ATOM_ENCODER_CMD_DP_LINK_TRAINING_COMPLETE, 0); 594 595 return 0; 596 } 597 598 static int 599 amdgpu_atombios_dp_link_train_cr(struct amdgpu_atombios_dp_link_train_info *dp_info) 600 { 601 bool clock_recovery; 602 u8 voltage; 603 int i; 604 605 amdgpu_atombios_dp_set_tp(dp_info, DP_TRAINING_PATTERN_1); 606 memset(dp_info->train_set, 0, 4); 607 amdgpu_atombios_dp_update_vs_emph(dp_info); 608 609 udelay(400); 610 611 /* clock recovery loop */ 612 clock_recovery = false; 613 dp_info->tries = 0; 614 voltage = 0xff; 615 while (1) { 616 drm_dp_link_train_clock_recovery_delay(dp_info->aux, dp_info->dpcd); 617 618 if (drm_dp_dpcd_read_link_status(dp_info->aux, 619 dp_info->link_status) <= 0) { 620 DRM_ERROR("displayport link status failed\n"); 621 break; 622 } 623 624 if (drm_dp_clock_recovery_ok(dp_info->link_status, dp_info->dp_lane_count)) { 625 clock_recovery = true; 626 break; 627 } 628 629 for (i = 0; i < dp_info->dp_lane_count; i++) { 630 if ((dp_info->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0) 631 break; 632 } 633 if (i == dp_info->dp_lane_count) { 634 DRM_ERROR("clock recovery reached max voltage\n"); 635 break; 636 } 637 638 if ((dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) { 639 ++dp_info->tries; 640 if (dp_info->tries == 5) { 641 DRM_ERROR("clock recovery tried 5 times\n"); 642 break; 643 } 644 } else 645 dp_info->tries = 0; 646 647 voltage = dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK; 648 649 /* Compute new train_set as requested by sink */ 650 amdgpu_atombios_dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, 651 dp_info->train_set); 652 653 amdgpu_atombios_dp_update_vs_emph(dp_info); 654 } 655 if (!clock_recovery) { 656 DRM_ERROR("clock recovery failed\n"); 657 return -1; 658 } else { 659 DRM_DEBUG_KMS("clock recovery at voltage %d pre-emphasis %d\n", 660 dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK, 661 (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) >> 662 DP_TRAIN_PRE_EMPHASIS_SHIFT); 663 return 0; 664 } 665 } 666 667 static int 668 amdgpu_atombios_dp_link_train_ce(struct amdgpu_atombios_dp_link_train_info *dp_info) 669 { 670 bool channel_eq; 671 672 if (dp_info->tp3_supported) 673 amdgpu_atombios_dp_set_tp(dp_info, DP_TRAINING_PATTERN_3); 674 else 675 amdgpu_atombios_dp_set_tp(dp_info, DP_TRAINING_PATTERN_2); 676 677 /* channel equalization loop */ 678 dp_info->tries = 0; 679 channel_eq = false; 680 while (1) { 681 drm_dp_link_train_channel_eq_delay(dp_info->aux, dp_info->dpcd); 682 683 if (drm_dp_dpcd_read_link_status(dp_info->aux, 684 dp_info->link_status) <= 0) { 685 DRM_ERROR("displayport link status failed\n"); 686 break; 687 } 688 689 if (drm_dp_channel_eq_ok(dp_info->link_status, dp_info->dp_lane_count)) { 690 channel_eq = true; 691 break; 692 } 693 694 /* Try 5 times */ 695 if (dp_info->tries > 5) { 696 DRM_ERROR("channel eq failed: 5 tries\n"); 697 break; 698 } 699 700 /* Compute new train_set as requested by sink */ 701 amdgpu_atombios_dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, 702 dp_info->train_set); 703 704 amdgpu_atombios_dp_update_vs_emph(dp_info); 705 dp_info->tries++; 706 } 707 708 if (!channel_eq) { 709 DRM_ERROR("channel eq failed\n"); 710 return -1; 711 } else { 712 DRM_DEBUG_KMS("channel eq at voltage %d pre-emphasis %d\n", 713 dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK, 714 (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) 715 >> DP_TRAIN_PRE_EMPHASIS_SHIFT); 716 return 0; 717 } 718 } 719 720 void amdgpu_atombios_dp_link_train(struct drm_encoder *encoder, 721 struct drm_connector *connector) 722 { 723 struct drm_device *dev = encoder->dev; 724 struct amdgpu_device *adev = drm_to_adev(dev); 725 struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder); 726 struct amdgpu_connector *amdgpu_connector; 727 struct amdgpu_connector_atom_dig *dig_connector; 728 struct amdgpu_atombios_dp_link_train_info dp_info; 729 u8 tmp; 730 731 if (!amdgpu_encoder->enc_priv) 732 return; 733 734 amdgpu_connector = to_amdgpu_connector(connector); 735 if (!amdgpu_connector->con_priv) 736 return; 737 dig_connector = amdgpu_connector->con_priv; 738 739 if ((dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_DISPLAYPORT) && 740 (dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_eDP)) 741 return; 742 743 if (drm_dp_dpcd_readb(&amdgpu_connector->ddc_bus->aux, DP_MAX_LANE_COUNT, &tmp) 744 == 1) { 745 if (tmp & DP_TPS3_SUPPORTED) 746 dp_info.tp3_supported = true; 747 else 748 dp_info.tp3_supported = false; 749 } else { 750 dp_info.tp3_supported = false; 751 } 752 753 memcpy(dp_info.dpcd, dig_connector->dpcd, DP_RECEIVER_CAP_SIZE); 754 dp_info.adev = adev; 755 dp_info.encoder = encoder; 756 dp_info.connector = connector; 757 dp_info.dp_lane_count = dig_connector->dp_lane_count; 758 dp_info.dp_clock = dig_connector->dp_clock; 759 dp_info.aux = &amdgpu_connector->ddc_bus->aux; 760 761 if (amdgpu_atombios_dp_link_train_init(&dp_info)) 762 goto done; 763 if (amdgpu_atombios_dp_link_train_cr(&dp_info)) 764 goto done; 765 if (amdgpu_atombios_dp_link_train_ce(&dp_info)) 766 goto done; 767 done: 768 if (amdgpu_atombios_dp_link_train_finish(&dp_info)) 769 return; 770 } 771