1 /* $NetBSD: amdgpu_atombios_dp.c,v 1.4 2021/12/18 23:44:58 riastradh Exp $ */ 2 3 /* 4 * Copyright 2007-8 Advanced Micro Devices, Inc. 5 * Copyright 2008 Red Hat Inc. 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a 8 * copy of this software and associated documentation files (the "Software"), 9 * to deal in the Software without restriction, including without limitation 10 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 11 * and/or sell copies of the Software, and to permit persons to whom the 12 * Software is furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included in 15 * all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 23 * OTHER DEALINGS IN THE SOFTWARE. 24 * 25 * Authors: Dave Airlie 26 * Alex Deucher 27 * Jerome Glisse 28 */ 29 30 #include <sys/cdefs.h> 31 __KERNEL_RCSID(0, "$NetBSD: amdgpu_atombios_dp.c,v 1.4 2021/12/18 23:44:58 riastradh Exp $"); 32 33 #include <drm/amdgpu_drm.h> 34 #include "amdgpu.h" 35 36 #include "atom.h" 37 #include "atom-bits.h" 38 #include "atombios_encoders.h" 39 #include "atombios_dp.h" 40 #include "amdgpu_connectors.h" 41 #include "amdgpu_atombios.h" 42 #include <drm/drm_dp_helper.h> 43 44 /* move these to drm_dp_helper.c/h */ 45 #define DP_LINK_CONFIGURATION_SIZE 9 46 #define DP_DPCD_SIZE DP_RECEIVER_CAP_SIZE 47 48 static const char *const voltage_names[] = { 49 "0.4V", "0.6V", "0.8V", "1.2V" 50 }; 51 static const char *const pre_emph_names[] = { 52 "0dB", "3.5dB", "6dB", "9.5dB" 53 }; 54 55 /***** amdgpu AUX functions *****/ 56 57 union aux_channel_transaction { 58 PROCESS_AUX_CHANNEL_TRANSACTION_PS_ALLOCATION v1; 59 PROCESS_AUX_CHANNEL_TRANSACTION_PARAMETERS_V2 v2; 60 }; 61 62 static int amdgpu_atombios_dp_process_aux_ch(struct amdgpu_i2c_chan *chan, 63 u8 *send, int send_bytes, 64 u8 *recv, int recv_size, 65 u8 delay, u8 *ack) 66 { 67 struct drm_device *dev = chan->dev; 68 struct amdgpu_device *adev = dev->dev_private; 69 union aux_channel_transaction args; 70 int index = GetIndexIntoMasterTable(COMMAND, ProcessAuxChannelTransaction); 71 unsigned char *base; 72 int recv_bytes; 73 int r = 0; 74 75 memset(&args, 0, sizeof(args)); 76 77 mutex_lock(&chan->mutex); 78 79 base = (unsigned char *)(adev->mode_info.atom_context->scratch + 1); 80 81 amdgpu_atombios_copy_swap(base, send, send_bytes, true); 82 83 args.v2.lpAuxRequest = cpu_to_le16((u16)(0 + 4)); 84 args.v2.lpDataOut = cpu_to_le16((u16)(16 + 4)); 85 args.v2.ucDataOutLen = 0; 86 args.v2.ucChannelID = chan->rec.i2c_id; 87 args.v2.ucDelay = delay / 10; 88 args.v2.ucHPD_ID = chan->rec.hpd; 89 90 amdgpu_atom_execute_table(adev->mode_info.atom_context, index, (uint32_t *)&args); 91 92 *ack = args.v2.ucReplyStatus; 93 94 /* timeout */ 95 if (args.v2.ucReplyStatus == 1) { 96 r = -ETIMEDOUT; 97 goto done; 98 } 99 100 /* flags not zero */ 101 if (args.v2.ucReplyStatus == 2) { 102 DRM_DEBUG_KMS("dp_aux_ch flags not zero\n"); 103 r = -EIO; 104 goto done; 105 } 106 107 /* error */ 108 if (args.v2.ucReplyStatus == 3) { 109 DRM_DEBUG_KMS("dp_aux_ch error\n"); 110 r = -EIO; 111 goto done; 112 } 113 114 recv_bytes = args.v1.ucDataOutLen; 115 if (recv_bytes > recv_size) 116 recv_bytes = recv_size; 117 118 if (recv && recv_size) 119 amdgpu_atombios_copy_swap(recv, base + 16, recv_bytes, false); 120 121 r = recv_bytes; 122 done: 123 mutex_unlock(&chan->mutex); 124 125 return r; 126 } 127 128 #define BARE_ADDRESS_SIZE 3 129 #define HEADER_SIZE (BARE_ADDRESS_SIZE + 1) 130 131 static ssize_t 132 amdgpu_atombios_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg) 133 { 134 struct amdgpu_i2c_chan *chan = 135 container_of(aux, struct amdgpu_i2c_chan, aux); 136 int ret; 137 u8 tx_buf[20]; 138 size_t tx_size; 139 u8 ack, delay = 0; 140 141 if (WARN_ON(msg->size > 16)) 142 return -E2BIG; 143 144 tx_buf[0] = msg->address & 0xff; 145 tx_buf[1] = msg->address >> 8; 146 tx_buf[2] = (msg->request << 4) | 147 ((msg->address >> 16) & 0xf); 148 tx_buf[3] = msg->size ? (msg->size - 1) : 0; 149 150 switch (msg->request & ~DP_AUX_I2C_MOT) { 151 case DP_AUX_NATIVE_WRITE: 152 case DP_AUX_I2C_WRITE: 153 /* tx_size needs to be 4 even for bare address packets since the atom 154 * table needs the info in tx_buf[3]. 155 */ 156 tx_size = HEADER_SIZE + msg->size; 157 if (msg->size == 0) 158 tx_buf[3] |= BARE_ADDRESS_SIZE << 4; 159 else 160 tx_buf[3] |= tx_size << 4; 161 memcpy(tx_buf + HEADER_SIZE, msg->buffer, msg->size); 162 ret = amdgpu_atombios_dp_process_aux_ch(chan, 163 tx_buf, tx_size, NULL, 0, delay, &ack); 164 if (ret >= 0) 165 /* Return payload size. */ 166 ret = msg->size; 167 break; 168 case DP_AUX_NATIVE_READ: 169 case DP_AUX_I2C_READ: 170 /* tx_size needs to be 4 even for bare address packets since the atom 171 * table needs the info in tx_buf[3]. 172 */ 173 tx_size = HEADER_SIZE; 174 if (msg->size == 0) 175 tx_buf[3] |= BARE_ADDRESS_SIZE << 4; 176 else 177 tx_buf[3] |= tx_size << 4; 178 ret = amdgpu_atombios_dp_process_aux_ch(chan, 179 tx_buf, tx_size, msg->buffer, msg->size, delay, &ack); 180 break; 181 default: 182 ret = -EINVAL; 183 break; 184 } 185 186 if (ret >= 0) 187 msg->reply = ack >> 4; 188 189 return ret; 190 } 191 192 void amdgpu_atombios_dp_aux_init(struct amdgpu_connector *amdgpu_connector) 193 { 194 int ret; 195 196 amdgpu_connector->ddc_bus->rec.hpd = amdgpu_connector->hpd.hpd; 197 amdgpu_connector->ddc_bus->aux.dev = amdgpu_connector->base.kdev; 198 amdgpu_connector->ddc_bus->aux.transfer = amdgpu_atombios_dp_aux_transfer; 199 ret = drm_dp_aux_register(&amdgpu_connector->ddc_bus->aux); 200 if (!ret) 201 amdgpu_connector->ddc_bus->has_aux = true; 202 203 WARN(ret, "drm_dp_aux_register_i2c_bus() failed with error %d\n", ret); 204 } 205 206 /***** general DP utility functions *****/ 207 208 #define DP_VOLTAGE_MAX DP_TRAIN_VOLTAGE_SWING_LEVEL_3 209 #define DP_PRE_EMPHASIS_MAX DP_TRAIN_PRE_EMPH_LEVEL_3 210 211 static void amdgpu_atombios_dp_get_adjust_train(const u8 link_status[DP_LINK_STATUS_SIZE], 212 int lane_count, 213 u8 train_set[4]) 214 { 215 u8 v = 0; 216 u8 p = 0; 217 int lane; 218 219 for (lane = 0; lane < lane_count; lane++) { 220 u8 this_v = drm_dp_get_adjust_request_voltage(link_status, lane); 221 u8 this_p = drm_dp_get_adjust_request_pre_emphasis(link_status, lane); 222 223 DRM_DEBUG_KMS("requested signal parameters: lane %d voltage %s pre_emph %s\n", 224 lane, 225 voltage_names[this_v >> DP_TRAIN_VOLTAGE_SWING_SHIFT], 226 pre_emph_names[this_p >> DP_TRAIN_PRE_EMPHASIS_SHIFT]); 227 228 if (this_v > v) 229 v = this_v; 230 if (this_p > p) 231 p = this_p; 232 } 233 234 if (v >= DP_VOLTAGE_MAX) 235 v |= DP_TRAIN_MAX_SWING_REACHED; 236 237 if (p >= DP_PRE_EMPHASIS_MAX) 238 p |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED; 239 240 DRM_DEBUG_KMS("using signal parameters: voltage %s pre_emph %s\n", 241 voltage_names[(v & DP_TRAIN_VOLTAGE_SWING_MASK) >> DP_TRAIN_VOLTAGE_SWING_SHIFT], 242 pre_emph_names[(p & DP_TRAIN_PRE_EMPHASIS_MASK) >> DP_TRAIN_PRE_EMPHASIS_SHIFT]); 243 244 for (lane = 0; lane < 4; lane++) 245 train_set[lane] = v | p; 246 } 247 248 /* convert bits per color to bits per pixel */ 249 /* get bpc from the EDID */ 250 static unsigned amdgpu_atombios_dp_convert_bpc_to_bpp(int bpc) 251 { 252 if (bpc == 0) 253 return 24; 254 else 255 return bpc * 3; 256 } 257 258 /***** amdgpu specific DP functions *****/ 259 260 static int amdgpu_atombios_dp_get_dp_link_config(struct drm_connector *connector, 261 const u8 dpcd[DP_DPCD_SIZE], 262 unsigned pix_clock, 263 unsigned *dp_lanes, unsigned *dp_rate) 264 { 265 unsigned bpp = 266 amdgpu_atombios_dp_convert_bpc_to_bpp(amdgpu_connector_get_monitor_bpc(connector)); 267 static const unsigned link_rates[3] = { 162000, 270000, 540000 }; 268 unsigned max_link_rate = drm_dp_max_link_rate(dpcd); 269 unsigned max_lane_num = drm_dp_max_lane_count(dpcd); 270 unsigned lane_num, i, max_pix_clock; 271 272 if (amdgpu_connector_encoder_get_dp_bridge_encoder_id(connector) == 273 ENCODER_OBJECT_ID_NUTMEG) { 274 for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) { 275 max_pix_clock = (lane_num * 270000 * 8) / bpp; 276 if (max_pix_clock >= pix_clock) { 277 *dp_lanes = lane_num; 278 *dp_rate = 270000; 279 return 0; 280 } 281 } 282 } else { 283 for (i = 0; i < ARRAY_SIZE(link_rates) && link_rates[i] <= max_link_rate; i++) { 284 for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) { 285 max_pix_clock = (lane_num * link_rates[i] * 8) / bpp; 286 if (max_pix_clock >= pix_clock) { 287 *dp_lanes = lane_num; 288 *dp_rate = link_rates[i]; 289 return 0; 290 } 291 } 292 } 293 } 294 295 return -EINVAL; 296 } 297 298 static u8 amdgpu_atombios_dp_encoder_service(struct amdgpu_device *adev, 299 int action, int dp_clock, 300 u8 ucconfig, u8 lane_num) 301 { 302 DP_ENCODER_SERVICE_PARAMETERS args; 303 int index = GetIndexIntoMasterTable(COMMAND, DPEncoderService); 304 305 memset(&args, 0, sizeof(args)); 306 args.ucLinkClock = dp_clock / 10; 307 args.ucConfig = ucconfig; 308 args.ucAction = action; 309 args.ucLaneNum = lane_num; 310 args.ucStatus = 0; 311 312 amdgpu_atom_execute_table(adev->mode_info.atom_context, index, (uint32_t *)&args); 313 return args.ucStatus; 314 } 315 316 u8 amdgpu_atombios_dp_get_sinktype(struct amdgpu_connector *amdgpu_connector) 317 { 318 struct drm_device *dev = amdgpu_connector->base.dev; 319 struct amdgpu_device *adev = dev->dev_private; 320 321 return amdgpu_atombios_dp_encoder_service(adev, ATOM_DP_ACTION_GET_SINK_TYPE, 0, 322 amdgpu_connector->ddc_bus->rec.i2c_id, 0); 323 } 324 325 static void amdgpu_atombios_dp_probe_oui(struct amdgpu_connector *amdgpu_connector) 326 { 327 struct amdgpu_connector_atom_dig *dig_connector = amdgpu_connector->con_priv; 328 u8 buf[3]; 329 330 if (!(dig_connector->dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT)) 331 return; 332 333 if (drm_dp_dpcd_read(&amdgpu_connector->ddc_bus->aux, DP_SINK_OUI, buf, 3) == 3) 334 DRM_DEBUG_KMS("Sink OUI: %02hhx%02hhx%02hhx\n", 335 buf[0], buf[1], buf[2]); 336 337 if (drm_dp_dpcd_read(&amdgpu_connector->ddc_bus->aux, DP_BRANCH_OUI, buf, 3) == 3) 338 DRM_DEBUG_KMS("Branch OUI: %02hhx%02hhx%02hhx\n", 339 buf[0], buf[1], buf[2]); 340 } 341 342 int amdgpu_atombios_dp_get_dpcd(struct amdgpu_connector *amdgpu_connector) 343 { 344 struct amdgpu_connector_atom_dig *dig_connector = amdgpu_connector->con_priv; 345 u8 msg[DP_DPCD_SIZE]; 346 int ret; 347 348 ret = drm_dp_dpcd_read(&amdgpu_connector->ddc_bus->aux, DP_DPCD_REV, 349 msg, DP_DPCD_SIZE); 350 if (ret == DP_DPCD_SIZE) { 351 memcpy(dig_connector->dpcd, msg, DP_DPCD_SIZE); 352 353 DRM_DEBUG_KMS("DPCD: %*ph\n", (int)sizeof(dig_connector->dpcd), 354 dig_connector->dpcd); 355 356 amdgpu_atombios_dp_probe_oui(amdgpu_connector); 357 358 return 0; 359 } 360 361 dig_connector->dpcd[0] = 0; 362 return -EINVAL; 363 } 364 365 int amdgpu_atombios_dp_get_panel_mode(struct drm_encoder *encoder, 366 struct drm_connector *connector) 367 { 368 struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector); 369 int panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE; 370 u16 dp_bridge = amdgpu_connector_encoder_get_dp_bridge_encoder_id(connector); 371 u8 tmp; 372 373 if (!amdgpu_connector->con_priv) 374 return panel_mode; 375 376 if (dp_bridge != ENCODER_OBJECT_ID_NONE) { 377 /* DP bridge chips */ 378 if (drm_dp_dpcd_readb(&amdgpu_connector->ddc_bus->aux, 379 DP_EDP_CONFIGURATION_CAP, &tmp) == 1) { 380 if (tmp & 1) 381 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE; 382 else if ((dp_bridge == ENCODER_OBJECT_ID_NUTMEG) || 383 (dp_bridge == ENCODER_OBJECT_ID_TRAVIS)) 384 panel_mode = DP_PANEL_MODE_INTERNAL_DP1_MODE; 385 else 386 panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE; 387 } 388 } else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) { 389 /* eDP */ 390 if (drm_dp_dpcd_readb(&amdgpu_connector->ddc_bus->aux, 391 DP_EDP_CONFIGURATION_CAP, &tmp) == 1) { 392 if (tmp & 1) 393 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE; 394 } 395 } 396 397 return panel_mode; 398 } 399 400 void amdgpu_atombios_dp_set_link_config(struct drm_connector *connector, 401 const struct drm_display_mode *mode) 402 { 403 struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector); 404 struct amdgpu_connector_atom_dig *dig_connector; 405 int ret; 406 407 if (!amdgpu_connector->con_priv) 408 return; 409 dig_connector = amdgpu_connector->con_priv; 410 411 if ((dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) || 412 (dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_eDP)) { 413 ret = amdgpu_atombios_dp_get_dp_link_config(connector, dig_connector->dpcd, 414 mode->clock, 415 &dig_connector->dp_lane_count, 416 &dig_connector->dp_clock); 417 if (ret) { 418 dig_connector->dp_clock = 0; 419 dig_connector->dp_lane_count = 0; 420 } 421 } 422 } 423 424 int amdgpu_atombios_dp_mode_valid_helper(struct drm_connector *connector, 425 struct drm_display_mode *mode) 426 { 427 struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector); 428 struct amdgpu_connector_atom_dig *dig_connector; 429 unsigned dp_lanes, dp_clock; 430 int ret; 431 432 if (!amdgpu_connector->con_priv) 433 return MODE_CLOCK_HIGH; 434 dig_connector = amdgpu_connector->con_priv; 435 436 ret = amdgpu_atombios_dp_get_dp_link_config(connector, dig_connector->dpcd, 437 mode->clock, &dp_lanes, &dp_clock); 438 if (ret) 439 return MODE_CLOCK_HIGH; 440 441 if ((dp_clock == 540000) && 442 (!amdgpu_connector_is_dp12_capable(connector))) 443 return MODE_CLOCK_HIGH; 444 445 return MODE_OK; 446 } 447 448 bool amdgpu_atombios_dp_needs_link_train(struct amdgpu_connector *amdgpu_connector) 449 { 450 u8 link_status[DP_LINK_STATUS_SIZE]; 451 struct amdgpu_connector_atom_dig *dig = amdgpu_connector->con_priv; 452 453 if (drm_dp_dpcd_read_link_status(&amdgpu_connector->ddc_bus->aux, link_status) 454 <= 0) 455 return false; 456 if (drm_dp_channel_eq_ok(link_status, dig->dp_lane_count)) 457 return false; 458 return true; 459 } 460 461 void amdgpu_atombios_dp_set_rx_power_state(struct drm_connector *connector, 462 u8 power_state) 463 { 464 struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector); 465 struct amdgpu_connector_atom_dig *dig_connector; 466 467 if (!amdgpu_connector->con_priv) 468 return; 469 470 dig_connector = amdgpu_connector->con_priv; 471 472 /* power up/down the sink */ 473 if (dig_connector->dpcd[0] >= 0x11) { 474 drm_dp_dpcd_writeb(&amdgpu_connector->ddc_bus->aux, 475 DP_SET_POWER, power_state); 476 usleep_range(1000, 2000); 477 } 478 } 479 480 struct amdgpu_atombios_dp_link_train_info { 481 struct amdgpu_device *adev; 482 struct drm_encoder *encoder; 483 struct drm_connector *connector; 484 int dp_clock; 485 int dp_lane_count; 486 bool tp3_supported; 487 u8 dpcd[DP_RECEIVER_CAP_SIZE]; 488 u8 train_set[4]; 489 u8 link_status[DP_LINK_STATUS_SIZE]; 490 u8 tries; 491 struct drm_dp_aux *aux; 492 }; 493 494 static void 495 amdgpu_atombios_dp_update_vs_emph(struct amdgpu_atombios_dp_link_train_info *dp_info) 496 { 497 /* set the initial vs/emph on the source */ 498 amdgpu_atombios_encoder_setup_dig_transmitter(dp_info->encoder, 499 ATOM_TRANSMITTER_ACTION_SETUP_VSEMPH, 500 0, dp_info->train_set[0]); /* sets all lanes at once */ 501 502 /* set the vs/emph on the sink */ 503 drm_dp_dpcd_write(dp_info->aux, DP_TRAINING_LANE0_SET, 504 dp_info->train_set, dp_info->dp_lane_count); 505 } 506 507 static void 508 amdgpu_atombios_dp_set_tp(struct amdgpu_atombios_dp_link_train_info *dp_info, int tp) 509 { 510 int rtp = 0; 511 512 /* set training pattern on the source */ 513 switch (tp) { 514 case DP_TRAINING_PATTERN_1: 515 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN1; 516 break; 517 case DP_TRAINING_PATTERN_2: 518 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN2; 519 break; 520 case DP_TRAINING_PATTERN_3: 521 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN3; 522 break; 523 } 524 amdgpu_atombios_encoder_setup_dig_encoder(dp_info->encoder, rtp, 0); 525 526 /* enable training pattern on the sink */ 527 drm_dp_dpcd_writeb(dp_info->aux, DP_TRAINING_PATTERN_SET, tp); 528 } 529 530 static int 531 amdgpu_atombios_dp_link_train_init(struct amdgpu_atombios_dp_link_train_info *dp_info) 532 { 533 struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(dp_info->encoder); 534 struct amdgpu_encoder_atom_dig *dig = amdgpu_encoder->enc_priv; 535 u8 tmp; 536 537 /* power up the sink */ 538 amdgpu_atombios_dp_set_rx_power_state(dp_info->connector, DP_SET_POWER_D0); 539 540 /* possibly enable downspread on the sink */ 541 if (dp_info->dpcd[3] & 0x1) 542 drm_dp_dpcd_writeb(dp_info->aux, 543 DP_DOWNSPREAD_CTRL, DP_SPREAD_AMP_0_5); 544 else 545 drm_dp_dpcd_writeb(dp_info->aux, 546 DP_DOWNSPREAD_CTRL, 0); 547 548 if (dig->panel_mode == DP_PANEL_MODE_INTERNAL_DP2_MODE) 549 drm_dp_dpcd_writeb(dp_info->aux, DP_EDP_CONFIGURATION_SET, 1); 550 551 /* set the lane count on the sink */ 552 tmp = dp_info->dp_lane_count; 553 if (drm_dp_enhanced_frame_cap(dp_info->dpcd)) 554 tmp |= DP_LANE_COUNT_ENHANCED_FRAME_EN; 555 drm_dp_dpcd_writeb(dp_info->aux, DP_LANE_COUNT_SET, tmp); 556 557 /* set the link rate on the sink */ 558 tmp = drm_dp_link_rate_to_bw_code(dp_info->dp_clock); 559 drm_dp_dpcd_writeb(dp_info->aux, DP_LINK_BW_SET, tmp); 560 561 /* start training on the source */ 562 amdgpu_atombios_encoder_setup_dig_encoder(dp_info->encoder, 563 ATOM_ENCODER_CMD_DP_LINK_TRAINING_START, 0); 564 565 /* disable the training pattern on the sink */ 566 drm_dp_dpcd_writeb(dp_info->aux, 567 DP_TRAINING_PATTERN_SET, 568 DP_TRAINING_PATTERN_DISABLE); 569 570 return 0; 571 } 572 573 static int 574 amdgpu_atombios_dp_link_train_finish(struct amdgpu_atombios_dp_link_train_info *dp_info) 575 { 576 udelay(400); 577 578 /* disable the training pattern on the sink */ 579 drm_dp_dpcd_writeb(dp_info->aux, 580 DP_TRAINING_PATTERN_SET, 581 DP_TRAINING_PATTERN_DISABLE); 582 583 /* disable the training pattern on the source */ 584 amdgpu_atombios_encoder_setup_dig_encoder(dp_info->encoder, 585 ATOM_ENCODER_CMD_DP_LINK_TRAINING_COMPLETE, 0); 586 587 return 0; 588 } 589 590 static int 591 amdgpu_atombios_dp_link_train_cr(struct amdgpu_atombios_dp_link_train_info *dp_info) 592 { 593 bool clock_recovery; 594 u8 voltage; 595 int i; 596 597 amdgpu_atombios_dp_set_tp(dp_info, DP_TRAINING_PATTERN_1); 598 memset(dp_info->train_set, 0, 4); 599 amdgpu_atombios_dp_update_vs_emph(dp_info); 600 601 udelay(400); 602 603 /* clock recovery loop */ 604 clock_recovery = false; 605 dp_info->tries = 0; 606 voltage = 0xff; 607 while (1) { 608 drm_dp_link_train_clock_recovery_delay(dp_info->dpcd); 609 610 if (drm_dp_dpcd_read_link_status(dp_info->aux, 611 dp_info->link_status) <= 0) { 612 DRM_ERROR("displayport link status failed\n"); 613 break; 614 } 615 616 if (drm_dp_clock_recovery_ok(dp_info->link_status, dp_info->dp_lane_count)) { 617 clock_recovery = true; 618 break; 619 } 620 621 for (i = 0; i < dp_info->dp_lane_count; i++) { 622 if ((dp_info->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0) 623 break; 624 } 625 if (i == dp_info->dp_lane_count) { 626 DRM_ERROR("clock recovery reached max voltage\n"); 627 break; 628 } 629 630 if ((dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) { 631 ++dp_info->tries; 632 if (dp_info->tries == 5) { 633 DRM_ERROR("clock recovery tried 5 times\n"); 634 break; 635 } 636 } else 637 dp_info->tries = 0; 638 639 voltage = dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK; 640 641 /* Compute new train_set as requested by sink */ 642 amdgpu_atombios_dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, 643 dp_info->train_set); 644 645 amdgpu_atombios_dp_update_vs_emph(dp_info); 646 } 647 if (!clock_recovery) { 648 DRM_ERROR("clock recovery failed\n"); 649 return -1; 650 } else { 651 DRM_DEBUG_KMS("clock recovery at voltage %d pre-emphasis %d\n", 652 dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK, 653 (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) >> 654 DP_TRAIN_PRE_EMPHASIS_SHIFT); 655 return 0; 656 } 657 } 658 659 static int 660 amdgpu_atombios_dp_link_train_ce(struct amdgpu_atombios_dp_link_train_info *dp_info) 661 { 662 bool channel_eq; 663 664 if (dp_info->tp3_supported) 665 amdgpu_atombios_dp_set_tp(dp_info, DP_TRAINING_PATTERN_3); 666 else 667 amdgpu_atombios_dp_set_tp(dp_info, DP_TRAINING_PATTERN_2); 668 669 /* channel equalization loop */ 670 dp_info->tries = 0; 671 channel_eq = false; 672 while (1) { 673 drm_dp_link_train_channel_eq_delay(dp_info->dpcd); 674 675 if (drm_dp_dpcd_read_link_status(dp_info->aux, 676 dp_info->link_status) <= 0) { 677 DRM_ERROR("displayport link status failed\n"); 678 break; 679 } 680 681 if (drm_dp_channel_eq_ok(dp_info->link_status, dp_info->dp_lane_count)) { 682 channel_eq = true; 683 break; 684 } 685 686 /* Try 5 times */ 687 if (dp_info->tries > 5) { 688 DRM_ERROR("channel eq failed: 5 tries\n"); 689 break; 690 } 691 692 /* Compute new train_set as requested by sink */ 693 amdgpu_atombios_dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, 694 dp_info->train_set); 695 696 amdgpu_atombios_dp_update_vs_emph(dp_info); 697 dp_info->tries++; 698 } 699 700 if (!channel_eq) { 701 DRM_ERROR("channel eq failed\n"); 702 return -1; 703 } else { 704 DRM_DEBUG_KMS("channel eq at voltage %d pre-emphasis %d\n", 705 dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK, 706 (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) 707 >> DP_TRAIN_PRE_EMPHASIS_SHIFT); 708 return 0; 709 } 710 } 711 712 void amdgpu_atombios_dp_link_train(struct drm_encoder *encoder, 713 struct drm_connector *connector) 714 { 715 struct drm_device *dev = encoder->dev; 716 struct amdgpu_device *adev = dev->dev_private; 717 struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder); 718 struct amdgpu_connector *amdgpu_connector; 719 struct amdgpu_connector_atom_dig *dig_connector; 720 struct amdgpu_atombios_dp_link_train_info dp_info; 721 u8 tmp; 722 723 if (!amdgpu_encoder->enc_priv) 724 return; 725 726 amdgpu_connector = to_amdgpu_connector(connector); 727 if (!amdgpu_connector->con_priv) 728 return; 729 dig_connector = amdgpu_connector->con_priv; 730 731 if ((dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_DISPLAYPORT) && 732 (dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_eDP)) 733 return; 734 735 if (drm_dp_dpcd_readb(&amdgpu_connector->ddc_bus->aux, DP_MAX_LANE_COUNT, &tmp) 736 == 1) { 737 if (tmp & DP_TPS3_SUPPORTED) 738 dp_info.tp3_supported = true; 739 else 740 dp_info.tp3_supported = false; 741 } else { 742 dp_info.tp3_supported = false; 743 } 744 745 memcpy(dp_info.dpcd, dig_connector->dpcd, DP_RECEIVER_CAP_SIZE); 746 dp_info.adev = adev; 747 dp_info.encoder = encoder; 748 dp_info.connector = connector; 749 dp_info.dp_lane_count = dig_connector->dp_lane_count; 750 dp_info.dp_clock = dig_connector->dp_clock; 751 dp_info.aux = &amdgpu_connector->ddc_bus->aux; 752 753 if (amdgpu_atombios_dp_link_train_init(&dp_info)) 754 goto done; 755 if (amdgpu_atombios_dp_link_train_cr(&dp_info)) 756 goto done; 757 if (amdgpu_atombios_dp_link_train_ce(&dp_info)) 758 goto done; 759 done: 760 if (amdgpu_atombios_dp_link_train_finish(&dp_info)) 761 return; 762 } 763
Indexes created Mon Sep 22 21:09:42 GMT 2025