1 /* 2 * Copyright 2022 Advanced Micro Devices, Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 * Authors: AMD 23 * 24 */ 25 26 /* FILE POLICY AND INTENDED USAGE: 27 * This file manages link detection states and receiver states by using various 28 * link protocols. It also provides helper functions to interpret certain 29 * capabilities or status based on the states it manages or retrieve them 30 * directly from connected receivers. 31 */ 32 33 #include "link_dpms.h" 34 #include "link_detection.h" 35 #include "link_hwss.h" 36 #include "protocols/link_edp_panel_control.h" 37 #include "protocols/link_ddc.h" 38 #include "protocols/link_hpd.h" 39 #include "protocols/link_dpcd.h" 40 #include "protocols/link_dp_capability.h" 41 #include "protocols/link_dp_dpia.h" 42 #include "protocols/link_dp_phy.h" 43 #include "protocols/link_dp_training.h" 44 #include "protocols/link_dp_dpia_bw.h" 45 #include "accessories/link_dp_trace.h" 46 47 #include "link_enc_cfg.h" 48 #include "dm_helpers.h" 49 #include "clk_mgr.h" 50 51 // Offset DPCD 050Eh == 0x5A 52 #define MST_HUB_ID_0x5A 0x5A 53 54 #define DC_LOGGER \ 55 link->ctx->logger 56 #define DC_LOGGER_INIT(logger) 57 58 #define LINK_INFO(...) \ 59 DC_LOG_HW_HOTPLUG( \ 60 __VA_ARGS__) 61 /* 62 * Some receivers fail to train on first try and are good 63 * on subsequent tries. 2 retries should be plenty. If we 64 * don't have a successful training then we don't expect to 65 * ever get one. 66 */ 67 #define LINK_TRAINING_MAX_VERIFY_RETRY 2 68 69 static const u8 DP_SINK_BRANCH_DEV_NAME_7580[] = "7580\x80u"; 70 71 static const u8 dp_hdmi_dongle_signature_str[] = "DP-HDMI ADAPTOR"; 72 73 static enum ddc_transaction_type get_ddc_transaction_type(enum signal_type sink_signal) 74 { 75 enum ddc_transaction_type transaction_type = DDC_TRANSACTION_TYPE_NONE; 76 77 switch (sink_signal) { 78 case SIGNAL_TYPE_DVI_SINGLE_LINK: 79 case SIGNAL_TYPE_DVI_DUAL_LINK: 80 case SIGNAL_TYPE_HDMI_TYPE_A: 81 case SIGNAL_TYPE_LVDS: 82 case SIGNAL_TYPE_RGB: 83 transaction_type = DDC_TRANSACTION_TYPE_I2C; 84 break; 85 86 case SIGNAL_TYPE_DISPLAY_PORT: 87 case SIGNAL_TYPE_EDP: 88 transaction_type = DDC_TRANSACTION_TYPE_I2C_OVER_AUX; 89 break; 90 91 case SIGNAL_TYPE_DISPLAY_PORT_MST: 92 /* MST does not use I2COverAux, but there is the 93 * SPECIAL use case for "immediate dwnstrm device 94 * access" (EPR#370830). 95 */ 96 transaction_type = DDC_TRANSACTION_TYPE_I2C_OVER_AUX; 97 break; 98 99 default: 100 break; 101 } 102 103 return transaction_type; 104 } 105 106 static enum signal_type get_basic_signal_type(struct graphics_object_id encoder, 107 struct graphics_object_id downstream) 108 { 109 if (downstream.type == OBJECT_TYPE_CONNECTOR) { 110 switch (downstream.id) { 111 case CONNECTOR_ID_SINGLE_LINK_DVII: 112 switch (encoder.id) { 113 case ENCODER_ID_INTERNAL_DAC1: 114 case ENCODER_ID_INTERNAL_KLDSCP_DAC1: 115 case ENCODER_ID_INTERNAL_DAC2: 116 case ENCODER_ID_INTERNAL_KLDSCP_DAC2: 117 return SIGNAL_TYPE_RGB; 118 default: 119 return SIGNAL_TYPE_DVI_SINGLE_LINK; 120 } 121 break; 122 case CONNECTOR_ID_DUAL_LINK_DVII: 123 { 124 switch (encoder.id) { 125 case ENCODER_ID_INTERNAL_DAC1: 126 case ENCODER_ID_INTERNAL_KLDSCP_DAC1: 127 case ENCODER_ID_INTERNAL_DAC2: 128 case ENCODER_ID_INTERNAL_KLDSCP_DAC2: 129 return SIGNAL_TYPE_RGB; 130 default: 131 return SIGNAL_TYPE_DVI_DUAL_LINK; 132 } 133 } 134 break; 135 case CONNECTOR_ID_SINGLE_LINK_DVID: 136 return SIGNAL_TYPE_DVI_SINGLE_LINK; 137 case CONNECTOR_ID_DUAL_LINK_DVID: 138 return SIGNAL_TYPE_DVI_DUAL_LINK; 139 case CONNECTOR_ID_VGA: 140 return SIGNAL_TYPE_RGB; 141 case CONNECTOR_ID_HDMI_TYPE_A: 142 return SIGNAL_TYPE_HDMI_TYPE_A; 143 case CONNECTOR_ID_LVDS: 144 return SIGNAL_TYPE_LVDS; 145 case CONNECTOR_ID_DISPLAY_PORT: 146 case CONNECTOR_ID_USBC: 147 return SIGNAL_TYPE_DISPLAY_PORT; 148 case CONNECTOR_ID_EDP: 149 return SIGNAL_TYPE_EDP; 150 default: 151 return SIGNAL_TYPE_NONE; 152 } 153 } else if (downstream.type == OBJECT_TYPE_ENCODER) { 154 switch (downstream.id) { 155 case ENCODER_ID_EXTERNAL_NUTMEG: 156 case ENCODER_ID_EXTERNAL_TRAVIS: 157 return SIGNAL_TYPE_DISPLAY_PORT; 158 default: 159 return SIGNAL_TYPE_NONE; 160 } 161 } 162 163 return SIGNAL_TYPE_NONE; 164 } 165 166 /* 167 * @brief 168 * Detect output sink type 169 */ 170 static enum signal_type link_detect_sink_signal_type(struct dc_link *link, 171 enum dc_detect_reason reason) 172 { 173 enum signal_type result; 174 struct graphics_object_id enc_id; 175 176 if (link->is_dig_mapping_flexible) 177 enc_id = (struct graphics_object_id){.id = ENCODER_ID_UNKNOWN}; 178 else 179 enc_id = link->link_enc->id; 180 result = get_basic_signal_type(enc_id, link->link_id); 181 182 /* Use basic signal type for link without physical connector. */ 183 if (link->ep_type != DISPLAY_ENDPOINT_PHY) 184 return result; 185 186 /* Internal digital encoder will detect only dongles 187 * that require digital signal 188 */ 189 190 /* Detection mechanism is different 191 * for different native connectors. 192 * LVDS connector supports only LVDS signal; 193 * PCIE is a bus slot, the actual connector needs to be detected first; 194 * eDP connector supports only eDP signal; 195 * HDMI should check straps for audio 196 */ 197 198 /* PCIE detects the actual connector on add-on board */ 199 if (link->link_id.id == CONNECTOR_ID_PCIE) { 200 /* ZAZTODO implement PCIE add-on card detection */ 201 } 202 203 switch (link->link_id.id) { 204 case CONNECTOR_ID_HDMI_TYPE_A: { 205 /* check audio support: 206 * if native HDMI is not supported, switch to DVI 207 */ 208 struct audio_support *aud_support = 209 &link->dc->res_pool->audio_support; 210 211 if (!aud_support->hdmi_audio_native) 212 if (link->link_id.id == CONNECTOR_ID_HDMI_TYPE_A) 213 result = SIGNAL_TYPE_DVI_SINGLE_LINK; 214 } 215 break; 216 case CONNECTOR_ID_DISPLAY_PORT: 217 case CONNECTOR_ID_USBC: { 218 /* DP HPD short pulse. Passive DP dongle will not 219 * have short pulse 220 */ 221 if (reason != DETECT_REASON_HPDRX) { 222 /* Check whether DP signal detected: if not - 223 * we assume signal is DVI; it could be corrected 224 * to HDMI after dongle detection 225 */ 226 if (!dm_helpers_is_dp_sink_present(link)) 227 result = SIGNAL_TYPE_DVI_SINGLE_LINK; 228 } 229 } 230 break; 231 default: 232 break; 233 } 234 235 return result; 236 } 237 238 static enum signal_type decide_signal_from_strap_and_dongle_type(enum display_dongle_type dongle_type, 239 struct audio_support *audio_support) 240 { 241 enum signal_type signal = SIGNAL_TYPE_NONE; 242 243 switch (dongle_type) { 244 case DISPLAY_DONGLE_DP_HDMI_DONGLE: 245 if (audio_support->hdmi_audio_on_dongle) 246 signal = SIGNAL_TYPE_HDMI_TYPE_A; 247 else 248 signal = SIGNAL_TYPE_DVI_SINGLE_LINK; 249 break; 250 case DISPLAY_DONGLE_DP_DVI_DONGLE: 251 signal = SIGNAL_TYPE_DVI_SINGLE_LINK; 252 break; 253 case DISPLAY_DONGLE_DP_HDMI_MISMATCHED_DONGLE: 254 if (audio_support->hdmi_audio_native) 255 signal = SIGNAL_TYPE_HDMI_TYPE_A; 256 else 257 signal = SIGNAL_TYPE_DVI_SINGLE_LINK; 258 break; 259 default: 260 signal = SIGNAL_TYPE_NONE; 261 break; 262 } 263 264 return signal; 265 } 266 267 static void read_scdc_caps(struct ddc_service *ddc_service, 268 struct dc_sink *sink) 269 { 270 uint8_t slave_address = HDMI_SCDC_ADDRESS; 271 uint8_t offset = HDMI_SCDC_MANUFACTURER_OUI; 272 273 link_query_ddc_data(ddc_service, slave_address, &offset, 274 sizeof(offset), sink->scdc_caps.manufacturer_OUI.byte, 275 sizeof(sink->scdc_caps.manufacturer_OUI.byte)); 276 277 offset = HDMI_SCDC_DEVICE_ID; 278 279 link_query_ddc_data(ddc_service, slave_address, &offset, 280 sizeof(offset), &(sink->scdc_caps.device_id.byte), 281 sizeof(sink->scdc_caps.device_id.byte)); 282 } 283 284 static bool i2c_read( 285 struct ddc_service *ddc, 286 uint32_t address, 287 uint8_t *buffer, 288 uint32_t len) 289 { 290 uint8_t offs_data = 0; 291 struct i2c_payload payloads[2] = { 292 { 293 .write = true, 294 .address = address, 295 .length = 1, 296 .data = &offs_data }, 297 { 298 .write = false, 299 .address = address, 300 .length = len, 301 .data = buffer } }; 302 303 struct i2c_command command = { 304 .payloads = payloads, 305 .number_of_payloads = 2, 306 .engine = DDC_I2C_COMMAND_ENGINE, 307 .speed = ddc->ctx->dc->caps.i2c_speed_in_khz }; 308 309 return dm_helpers_submit_i2c( 310 ddc->ctx, 311 ddc->link, 312 &command); 313 } 314 315 enum { 316 DP_SINK_CAP_SIZE = 317 DP_EDP_CONFIGURATION_CAP - DP_DPCD_REV + 1 318 }; 319 320 static void query_dp_dual_mode_adaptor( 321 struct ddc_service *ddc, 322 struct display_sink_capability *sink_cap) 323 { 324 uint8_t i; 325 bool is_valid_hdmi_signature; 326 enum display_dongle_type *dongle = &sink_cap->dongle_type; 327 uint8_t type2_dongle_buf[DP_ADAPTOR_TYPE2_SIZE]; 328 bool is_type2_dongle = false; 329 int retry_count = 2; 330 struct dp_hdmi_dongle_signature_data *dongle_signature; 331 struct dc_link *link = ddc->link; 332 333 /* Assume we have no valid DP passive dongle connected */ 334 *dongle = DISPLAY_DONGLE_NONE; 335 sink_cap->max_hdmi_pixel_clock = DP_ADAPTOR_HDMI_SAFE_MAX_TMDS_CLK; 336 337 /* Read DP-HDMI dongle I2c (no response interpreted as DP-DVI dongle)*/ 338 if (!i2c_read( 339 ddc, 340 DP_HDMI_DONGLE_ADDRESS, 341 type2_dongle_buf, 342 sizeof(type2_dongle_buf))) { 343 /* Passive HDMI dongles can sometimes fail here without retrying*/ 344 while (retry_count > 0) { 345 if (i2c_read(ddc, 346 DP_HDMI_DONGLE_ADDRESS, 347 type2_dongle_buf, 348 sizeof(type2_dongle_buf))) 349 break; 350 retry_count--; 351 } 352 if (retry_count == 0) { 353 *dongle = DISPLAY_DONGLE_DP_DVI_DONGLE; 354 sink_cap->max_hdmi_pixel_clock = DP_ADAPTOR_DVI_MAX_TMDS_CLK; 355 356 CONN_DATA_DETECT(ddc->link, type2_dongle_buf, sizeof(type2_dongle_buf), 357 "DP-DVI passive dongle %dMhz: ", 358 DP_ADAPTOR_DVI_MAX_TMDS_CLK / 1000); 359 return; 360 } 361 } 362 363 /* Check if Type 2 dongle.*/ 364 if (type2_dongle_buf[DP_ADAPTOR_TYPE2_REG_ID] == DP_ADAPTOR_TYPE2_ID) 365 is_type2_dongle = true; 366 367 dongle_signature = 368 (struct dp_hdmi_dongle_signature_data *)type2_dongle_buf; 369 370 is_valid_hdmi_signature = true; 371 372 /* Check EOT */ 373 if (dongle_signature->eot != DP_HDMI_DONGLE_SIGNATURE_EOT) { 374 is_valid_hdmi_signature = false; 375 } 376 377 /* Check signature */ 378 for (i = 0; i < sizeof(dongle_signature->id); ++i) { 379 /* If its not the right signature, 380 * skip mismatch in subversion byte.*/ 381 if (dongle_signature->id[i] != 382 dp_hdmi_dongle_signature_str[i] && i != 3) { 383 384 if (is_type2_dongle) { 385 is_valid_hdmi_signature = false; 386 break; 387 } 388 389 } 390 } 391 392 if (is_type2_dongle) { 393 uint32_t max_tmds_clk = 394 type2_dongle_buf[DP_ADAPTOR_TYPE2_REG_MAX_TMDS_CLK]; 395 396 max_tmds_clk = max_tmds_clk * 2 + max_tmds_clk / 2; 397 398 if (0 == max_tmds_clk || 399 max_tmds_clk < DP_ADAPTOR_TYPE2_MIN_TMDS_CLK || 400 max_tmds_clk > DP_ADAPTOR_TYPE2_MAX_TMDS_CLK) { 401 *dongle = DISPLAY_DONGLE_DP_DVI_DONGLE; 402 403 CONN_DATA_DETECT(ddc->link, type2_dongle_buf, 404 sizeof(type2_dongle_buf), 405 "DP-DVI passive dongle %dMhz: ", 406 DP_ADAPTOR_DVI_MAX_TMDS_CLK / 1000); 407 } else { 408 if (is_valid_hdmi_signature == true) { 409 *dongle = DISPLAY_DONGLE_DP_HDMI_DONGLE; 410 411 CONN_DATA_DETECT(ddc->link, type2_dongle_buf, 412 sizeof(type2_dongle_buf), 413 "Type 2 DP-HDMI passive dongle %dMhz: ", 414 max_tmds_clk); 415 } else { 416 *dongle = DISPLAY_DONGLE_DP_HDMI_MISMATCHED_DONGLE; 417 418 CONN_DATA_DETECT(ddc->link, type2_dongle_buf, 419 sizeof(type2_dongle_buf), 420 "Type 2 DP-HDMI passive dongle (no signature) %dMhz: ", 421 max_tmds_clk); 422 423 } 424 425 /* Multiply by 1000 to convert to kHz. */ 426 sink_cap->max_hdmi_pixel_clock = 427 max_tmds_clk * 1000; 428 } 429 sink_cap->is_dongle_type_one = false; 430 431 } else { 432 if (is_valid_hdmi_signature == true) { 433 *dongle = DISPLAY_DONGLE_DP_HDMI_DONGLE; 434 435 CONN_DATA_DETECT(ddc->link, type2_dongle_buf, 436 sizeof(type2_dongle_buf), 437 "Type 1 DP-HDMI passive dongle %dMhz: ", 438 sink_cap->max_hdmi_pixel_clock / 1000); 439 } else { 440 *dongle = DISPLAY_DONGLE_DP_HDMI_MISMATCHED_DONGLE; 441 442 CONN_DATA_DETECT(ddc->link, type2_dongle_buf, 443 sizeof(type2_dongle_buf), 444 "Type 1 DP-HDMI passive dongle (no signature) %dMhz: ", 445 sink_cap->max_hdmi_pixel_clock / 1000); 446 } 447 sink_cap->is_dongle_type_one = true; 448 } 449 450 return; 451 } 452 453 static enum signal_type dp_passive_dongle_detection(struct ddc_service *ddc, 454 struct display_sink_capability *sink_cap, 455 struct audio_support *audio_support) 456 { 457 query_dp_dual_mode_adaptor(ddc, sink_cap); 458 459 return decide_signal_from_strap_and_dongle_type(sink_cap->dongle_type, 460 audio_support); 461 } 462 463 static void link_disconnect_sink(struct dc_link *link) 464 { 465 if (link->local_sink) { 466 dc_sink_release(link->local_sink); 467 link->local_sink = NULL; 468 } 469 470 link->dpcd_sink_count = 0; 471 //link->dpcd_caps.dpcd_rev.raw = 0; 472 } 473 474 static void link_disconnect_remap(struct dc_sink *prev_sink, struct dc_link *link) 475 { 476 dc_sink_release(link->local_sink); 477 link->local_sink = prev_sink; 478 } 479 480 static void query_hdcp_capability(enum signal_type signal, struct dc_link *link) 481 { 482 struct hdcp_protection_message msg22; 483 struct hdcp_protection_message msg14; 484 485 memset(&msg22, 0, sizeof(struct hdcp_protection_message)); 486 memset(&msg14, 0, sizeof(struct hdcp_protection_message)); 487 memset(link->hdcp_caps.rx_caps.raw, 0, 488 sizeof(link->hdcp_caps.rx_caps.raw)); 489 490 if ((link->connector_signal == SIGNAL_TYPE_DISPLAY_PORT && 491 link->ddc->transaction_type == 492 DDC_TRANSACTION_TYPE_I2C_OVER_AUX) || 493 link->connector_signal == SIGNAL_TYPE_EDP) { 494 msg22.data = link->hdcp_caps.rx_caps.raw; 495 msg22.length = sizeof(link->hdcp_caps.rx_caps.raw); 496 msg22.msg_id = HDCP_MESSAGE_ID_RX_CAPS; 497 } else { 498 msg22.data = &link->hdcp_caps.rx_caps.fields.version; 499 msg22.length = sizeof(link->hdcp_caps.rx_caps.fields.version); 500 msg22.msg_id = HDCP_MESSAGE_ID_HDCP2VERSION; 501 } 502 msg22.version = HDCP_VERSION_22; 503 msg22.link = HDCP_LINK_PRIMARY; 504 msg22.max_retries = 5; 505 dc_process_hdcp_msg(signal, link, &msg22); 506 507 if (signal == SIGNAL_TYPE_DISPLAY_PORT || signal == SIGNAL_TYPE_DISPLAY_PORT_MST) { 508 msg14.data = &link->hdcp_caps.bcaps.raw; 509 msg14.length = sizeof(link->hdcp_caps.bcaps.raw); 510 msg14.msg_id = HDCP_MESSAGE_ID_READ_BCAPS; 511 msg14.version = HDCP_VERSION_14; 512 msg14.link = HDCP_LINK_PRIMARY; 513 msg14.max_retries = 5; 514 515 dc_process_hdcp_msg(signal, link, &msg14); 516 } 517 518 } 519 static void read_current_link_settings_on_detect(struct dc_link *link) 520 { 521 union lane_count_set lane_count_set = {0}; 522 uint8_t link_bw_set = 0; 523 uint8_t link_rate_set = 0; 524 uint32_t read_dpcd_retry_cnt = 10; 525 enum dc_status status = DC_ERROR_UNEXPECTED; 526 int i; 527 union max_down_spread max_down_spread = {0}; 528 529 // Read DPCD 00101h to find out the number of lanes currently set 530 for (i = 0; i < read_dpcd_retry_cnt; i++) { 531 status = core_link_read_dpcd(link, 532 DP_LANE_COUNT_SET, 533 &lane_count_set.raw, 534 sizeof(lane_count_set)); 535 /* First DPCD read after VDD ON can fail if the particular board 536 * does not have HPD pin wired correctly. So if DPCD read fails, 537 * which it should never happen, retry a few times. Target worst 538 * case scenario of 80 ms. 539 */ 540 if (status == DC_OK) { 541 link->cur_link_settings.lane_count = 542 lane_count_set.bits.LANE_COUNT_SET; 543 break; 544 } 545 546 msleep(8); 547 } 548 549 // Read DPCD 00100h to find if standard link rates are set 550 core_link_read_dpcd(link, DP_LINK_BW_SET, 551 &link_bw_set, sizeof(link_bw_set)); 552 553 if (link_bw_set == 0) { 554 if (link->connector_signal == SIGNAL_TYPE_EDP) { 555 /* If standard link rates are not being used, 556 * Read DPCD 00115h to find the edp link rate set used 557 */ 558 core_link_read_dpcd(link, DP_LINK_RATE_SET, 559 &link_rate_set, sizeof(link_rate_set)); 560 561 // edp_supported_link_rates_count = 0 for DP 562 if (link_rate_set < link->dpcd_caps.edp_supported_link_rates_count) { 563 link->cur_link_settings.link_rate = 564 link->dpcd_caps.edp_supported_link_rates[link_rate_set]; 565 link->cur_link_settings.link_rate_set = link_rate_set; 566 link->cur_link_settings.use_link_rate_set = true; 567 } 568 } else { 569 // Link Rate not found. Seamless boot may not work. 570 ASSERT(false); 571 } 572 } else { 573 link->cur_link_settings.link_rate = link_bw_set; 574 link->cur_link_settings.use_link_rate_set = false; 575 } 576 // Read DPCD 00003h to find the max down spread. 577 core_link_read_dpcd(link, DP_MAX_DOWNSPREAD, 578 &max_down_spread.raw, sizeof(max_down_spread)); 579 link->cur_link_settings.link_spread = 580 max_down_spread.bits.MAX_DOWN_SPREAD ? 581 LINK_SPREAD_05_DOWNSPREAD_30KHZ : LINK_SPREAD_DISABLED; 582 } 583 584 static bool detect_dp(struct dc_link *link, 585 struct display_sink_capability *sink_caps, 586 enum dc_detect_reason reason) 587 { 588 struct audio_support *audio_support = &link->dc->res_pool->audio_support; 589 590 sink_caps->signal = link_detect_sink_signal_type(link, reason); 591 sink_caps->transaction_type = 592 get_ddc_transaction_type(sink_caps->signal); 593 594 if (sink_caps->transaction_type == DDC_TRANSACTION_TYPE_I2C_OVER_AUX) { 595 sink_caps->signal = SIGNAL_TYPE_DISPLAY_PORT; 596 if (!detect_dp_sink_caps(link)) 597 return false; 598 599 if (is_dp_branch_device(link)) 600 /* DP SST branch */ 601 link->type = dc_connection_sst_branch; 602 } else { 603 if (link->dc->debug.disable_dp_plus_plus_wa && 604 link->link_enc->features.flags.bits.IS_UHBR20_CAPABLE) 605 return false; 606 607 /* DP passive dongles */ 608 sink_caps->signal = dp_passive_dongle_detection(link->ddc, 609 sink_caps, 610 audio_support); 611 link->dpcd_caps.dongle_type = sink_caps->dongle_type; 612 link->dpcd_caps.is_dongle_type_one = sink_caps->is_dongle_type_one; 613 link->dpcd_caps.dpcd_rev.raw = 0; 614 } 615 616 return true; 617 } 618 619 static bool is_same_edid(struct dc_edid *old_edid, struct dc_edid *new_edid) 620 { 621 if (old_edid->length != new_edid->length) 622 return false; 623 624 if (new_edid->length == 0) 625 return false; 626 627 return (memcmp(old_edid->raw_edid, 628 new_edid->raw_edid, new_edid->length) == 0); 629 } 630 631 static bool wait_for_entering_dp_alt_mode(struct dc_link *link) 632 { 633 634 /** 635 * something is terribly wrong if time out is > 200ms. (5Hz) 636 * 500 microseconds * 400 tries us 200 ms 637 **/ 638 unsigned int sleep_time_in_microseconds = 500; 639 unsigned int tries_allowed = 400; 640 bool is_in_alt_mode; 641 unsigned long long enter_timestamp; 642 unsigned long long finish_timestamp; 643 unsigned long long time_taken_in_ns; 644 int tries_taken; 645 646 DC_LOGGER_INIT(link->ctx->logger); 647 648 /** 649 * this function will only exist if we are on dcn21 (is_in_alt_mode is a 650 * function pointer, so checking to see if it is equal to 0 is the same 651 * as checking to see if it is null 652 **/ 653 if (!link->link_enc->funcs->is_in_alt_mode) 654 return true; 655 656 is_in_alt_mode = link->link_enc->funcs->is_in_alt_mode(link->link_enc); 657 DC_LOG_DC("DP Alt mode state on HPD: %d\n", is_in_alt_mode); 658 659 if (is_in_alt_mode) 660 return true; 661 662 enter_timestamp = dm_get_timestamp(link->ctx); 663 664 for (tries_taken = 0; tries_taken < tries_allowed; tries_taken++) { 665 udelay(sleep_time_in_microseconds); 666 /* ask the link if alt mode is enabled, if so return ok */ 667 if (link->link_enc->funcs->is_in_alt_mode(link->link_enc)) { 668 finish_timestamp = dm_get_timestamp(link->ctx); 669 time_taken_in_ns = 670 dm_get_elapse_time_in_ns(link->ctx, 671 finish_timestamp, 672 enter_timestamp); 673 DC_LOG_WARNING("Alt mode entered finished after %llu ms\n", 674 div_u64(time_taken_in_ns, 1000000)); 675 return true; 676 } 677 } 678 finish_timestamp = dm_get_timestamp(link->ctx); 679 time_taken_in_ns = dm_get_elapse_time_in_ns(link->ctx, finish_timestamp, 680 enter_timestamp); 681 DC_LOG_WARNING("Alt mode has timed out after %llu ms\n", 682 div_u64(time_taken_in_ns, 1000000)); 683 return false; 684 } 685 686 static void apply_dpia_mst_dsc_always_on_wa(struct dc_link *link) 687 { 688 /* Apply work around for tunneled MST on certain USB4 docks. Always use DSC if dock 689 * reports DSC support. 690 */ 691 if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA && 692 link->type == dc_connection_mst_branch && 693 link->dpcd_caps.branch_dev_id == DP_BRANCH_DEVICE_ID_90CC24 && 694 link->dpcd_caps.branch_hw_revision == DP_BRANCH_HW_REV_20 && 695 link->dpcd_caps.dsc_caps.dsc_basic_caps.fields.dsc_support.DSC_SUPPORT && 696 !link->dc->debug.dpia_debug.bits.disable_mst_dsc_work_around) 697 link->wa_flags.dpia_mst_dsc_always_on = true; 698 699 if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA && 700 link->type == dc_connection_mst_branch && 701 link->dpcd_caps.branch_dev_id == DP_BRANCH_DEVICE_ID_90CC24 && 702 link->dpcd_caps.branch_vendor_specific_data[2] == MST_HUB_ID_0x5A && 703 link->dpcd_caps.dsc_caps.dsc_basic_caps.fields.dsc_support.DSC_SUPPORT && 704 !link->dc->debug.dpia_debug.bits.disable_mst_dsc_work_around) { 705 link->wa_flags.dpia_mst_dsc_always_on = true; 706 } 707 } 708 709 static void revert_dpia_mst_dsc_always_on_wa(struct dc_link *link) 710 { 711 /* Disable work around which keeps DSC on for tunneled MST on certain USB4 docks. */ 712 if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA) 713 link->wa_flags.dpia_mst_dsc_always_on = false; 714 } 715 716 static bool discover_dp_mst_topology(struct dc_link *link, enum dc_detect_reason reason) 717 { 718 DC_LOGGER_INIT(link->ctx->logger); 719 720 LINK_INFO("link=%d, mst branch is now Connected\n", 721 link->link_index); 722 723 link->type = dc_connection_mst_branch; 724 apply_dpia_mst_dsc_always_on_wa(link); 725 726 dm_helpers_dp_update_branch_info(link->ctx, link); 727 if (dm_helpers_dp_mst_start_top_mgr(link->ctx, 728 link, (reason == DETECT_REASON_BOOT || reason == DETECT_REASON_RESUMEFROMS3S4))) { 729 link_disconnect_sink(link); 730 } else { 731 link->type = dc_connection_sst_branch; 732 } 733 734 return link->type == dc_connection_mst_branch; 735 } 736 737 bool link_reset_cur_dp_mst_topology(struct dc_link *link) 738 { 739 DC_LOGGER_INIT(link->ctx->logger); 740 741 LINK_INFO("link=%d, mst branch is now Disconnected\n", 742 link->link_index); 743 744 revert_dpia_mst_dsc_always_on_wa(link); 745 return dm_helpers_dp_mst_stop_top_mgr(link->ctx, link); 746 } 747 748 static bool should_prepare_phy_clocks_for_link_verification(const struct dc *dc, 749 enum dc_detect_reason reason) 750 { 751 int i; 752 bool can_apply_seamless_boot = false; 753 754 for (i = 0; i < dc->current_state->stream_count; i++) { 755 if (dc->current_state->streams[i]->apply_seamless_boot_optimization) { 756 can_apply_seamless_boot = true; 757 break; 758 } 759 } 760 761 return !can_apply_seamless_boot && reason != DETECT_REASON_BOOT; 762 } 763 764 static void prepare_phy_clocks_for_destructive_link_verification(const struct dc *dc) 765 { 766 dc_z10_restore(dc); 767 clk_mgr_exit_optimized_pwr_state(dc, dc->clk_mgr); 768 } 769 770 static void restore_phy_clocks_for_destructive_link_verification(const struct dc *dc) 771 { 772 clk_mgr_optimize_pwr_state(dc, dc->clk_mgr); 773 } 774 775 static void verify_link_capability_destructive(struct dc_link *link, 776 struct dc_sink *sink, 777 enum dc_detect_reason reason) 778 { 779 bool should_prepare_phy_clocks = 780 should_prepare_phy_clocks_for_link_verification(link->dc, reason); 781 782 if (should_prepare_phy_clocks) 783 prepare_phy_clocks_for_destructive_link_verification(link->dc); 784 785 if (dc_is_dp_signal(link->local_sink->sink_signal)) { 786 struct dc_link_settings known_limit_link_setting = 787 dp_get_max_link_cap(link); 788 link_set_all_streams_dpms_off_for_link(link); 789 dp_verify_link_cap_with_retries( 790 link, &known_limit_link_setting, 791 LINK_TRAINING_MAX_VERIFY_RETRY); 792 } else { 793 ASSERT(0); 794 } 795 796 if (should_prepare_phy_clocks) 797 restore_phy_clocks_for_destructive_link_verification(link->dc); 798 } 799 800 static void verify_link_capability_non_destructive(struct dc_link *link) 801 { 802 if (dc_is_dp_signal(link->local_sink->sink_signal)) { 803 if (dc_is_embedded_signal(link->local_sink->sink_signal) || 804 link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA) 805 /* TODO - should we check link encoder's max link caps here? 806 * How do we know which link encoder to check from? 807 */ 808 link->verified_link_cap = link->reported_link_cap; 809 else 810 link->verified_link_cap = dp_get_max_link_cap(link); 811 } 812 } 813 814 static bool should_verify_link_capability_destructively(struct dc_link *link, 815 enum dc_detect_reason reason) 816 { 817 bool destrictive = false; 818 struct dc_link_settings max_link_cap; 819 bool is_link_enc_unavailable = false; 820 821 if (!link->dc->config.unify_link_enc_assignment) 822 is_link_enc_unavailable = link->link_enc && 823 link->dc->res_pool->funcs->link_encs_assign && 824 !link_enc_cfg_is_link_enc_avail( 825 link->ctx->dc, 826 link->link_enc->preferred_engine, 827 link); 828 829 if (dc_is_dp_signal(link->local_sink->sink_signal)) { 830 max_link_cap = dp_get_max_link_cap(link); 831 destrictive = true; 832 833 if (link->dc->debug.skip_detection_link_training || 834 dc_is_embedded_signal(link->local_sink->sink_signal) || 835 (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA && 836 !link->dc->config.enable_dpia_pre_training)) { 837 destrictive = false; 838 } else if (link_dp_get_encoding_format(&max_link_cap) == 839 DP_8b_10b_ENCODING) { 840 if (link->dpcd_caps.is_mst_capable || 841 is_link_enc_unavailable) { 842 destrictive = false; 843 } 844 } 845 } 846 847 return destrictive; 848 } 849 850 static void verify_link_capability(struct dc_link *link, struct dc_sink *sink, 851 enum dc_detect_reason reason) 852 { 853 if (should_verify_link_capability_destructively(link, reason)) 854 verify_link_capability_destructive(link, sink, reason); 855 else 856 verify_link_capability_non_destructive(link); 857 } 858 859 /* 860 * detect_link_and_local_sink() - Detect if a sink is attached to a given link 861 * 862 * link->local_sink is created or destroyed as needed. 863 * 864 * This does not create remote sinks. 865 */ 866 static bool detect_link_and_local_sink(struct dc_link *link, 867 enum dc_detect_reason reason) 868 { 869 struct dc_sink_init_data sink_init_data = { 0 }; 870 struct display_sink_capability sink_caps = { 0 }; 871 uint32_t i; 872 bool converter_disable_audio = false; 873 struct audio_support *aud_support = &link->dc->res_pool->audio_support; 874 bool same_edid = false; 875 enum dc_edid_status edid_status; 876 struct dc_context *dc_ctx = link->ctx; 877 struct dc *dc = dc_ctx->dc; 878 struct dc_sink *sink = NULL; 879 struct dc_sink *prev_sink = NULL; 880 struct dpcd_caps prev_dpcd_caps; 881 enum dc_connection_type new_connection_type = dc_connection_none; 882 const uint32_t post_oui_delay = 30; // 30ms 883 884 DC_LOGGER_INIT(link->ctx->logger); 885 886 if (dc_is_virtual_signal(link->connector_signal)) 887 return false; 888 889 if (((link->connector_signal == SIGNAL_TYPE_LVDS || 890 link->connector_signal == SIGNAL_TYPE_EDP) && 891 (!link->dc->config.allow_edp_hotplug_detection)) && 892 link->local_sink) { 893 // need to re-write OUI and brightness in resume case 894 if (link->connector_signal == SIGNAL_TYPE_EDP && 895 (link->dpcd_sink_ext_caps.bits.oled == 1)) { 896 dpcd_set_source_specific_data(link); 897 msleep(post_oui_delay); 898 set_default_brightness_aux(link); 899 } 900 901 return true; 902 } 903 904 if (!link_detect_connection_type(link, &new_connection_type)) { 905 BREAK_TO_DEBUGGER(); 906 return false; 907 } 908 909 prev_sink = link->local_sink; 910 if (prev_sink) { 911 dc_sink_retain(prev_sink); 912 memcpy(&prev_dpcd_caps, &link->dpcd_caps, sizeof(struct dpcd_caps)); 913 } 914 915 link_disconnect_sink(link); 916 if (new_connection_type != dc_connection_none) { 917 link->type = new_connection_type; 918 link->link_state_valid = false; 919 920 /* From Disconnected-to-Connected. */ 921 switch (link->connector_signal) { 922 case SIGNAL_TYPE_HDMI_TYPE_A: { 923 sink_caps.transaction_type = DDC_TRANSACTION_TYPE_I2C; 924 if (aud_support->hdmi_audio_native) 925 sink_caps.signal = SIGNAL_TYPE_HDMI_TYPE_A; 926 else 927 sink_caps.signal = SIGNAL_TYPE_DVI_SINGLE_LINK; 928 break; 929 } 930 931 case SIGNAL_TYPE_DVI_SINGLE_LINK: { 932 sink_caps.transaction_type = DDC_TRANSACTION_TYPE_I2C; 933 sink_caps.signal = SIGNAL_TYPE_DVI_SINGLE_LINK; 934 break; 935 } 936 937 case SIGNAL_TYPE_DVI_DUAL_LINK: { 938 sink_caps.transaction_type = DDC_TRANSACTION_TYPE_I2C; 939 sink_caps.signal = SIGNAL_TYPE_DVI_DUAL_LINK; 940 break; 941 } 942 943 case SIGNAL_TYPE_LVDS: { 944 sink_caps.transaction_type = DDC_TRANSACTION_TYPE_I2C; 945 sink_caps.signal = SIGNAL_TYPE_LVDS; 946 break; 947 } 948 949 case SIGNAL_TYPE_EDP: { 950 detect_edp_sink_caps(link); 951 read_current_link_settings_on_detect(link); 952 953 /* Disable power sequence on MIPI panel + converter 954 */ 955 if (dc->config.enable_mipi_converter_optimization && 956 dc_ctx->dce_version == DCN_VERSION_3_01 && 957 link->dpcd_caps.sink_dev_id == DP_BRANCH_DEVICE_ID_0022B9 && 958 memcmp(&link->dpcd_caps.branch_dev_name, DP_SINK_BRANCH_DEV_NAME_7580, 959 sizeof(link->dpcd_caps.branch_dev_name)) == 0) { 960 dc->config.edp_no_power_sequencing = true; 961 962 if (!link->dpcd_caps.set_power_state_capable_edp) 963 link->wa_flags.dp_keep_receiver_powered = true; 964 } 965 966 sink_caps.transaction_type = DDC_TRANSACTION_TYPE_I2C_OVER_AUX; 967 sink_caps.signal = SIGNAL_TYPE_EDP; 968 break; 969 } 970 971 case SIGNAL_TYPE_DISPLAY_PORT: { 972 973 /* wa HPD high coming too early*/ 974 if (link->ep_type == DISPLAY_ENDPOINT_PHY && 975 link->link_enc->features.flags.bits.DP_IS_USB_C == 1) { 976 977 /* if alt mode times out, return false */ 978 if (!wait_for_entering_dp_alt_mode(link)) 979 return false; 980 } 981 982 if (!detect_dp(link, &sink_caps, reason)) { 983 984 if (prev_sink) 985 dc_sink_release(prev_sink); 986 return false; 987 } 988 989 /* Active SST downstream branch device unplug*/ 990 if (link->type == dc_connection_sst_branch && 991 link->dpcd_caps.sink_count.bits.SINK_COUNT == 0) { 992 if (prev_sink) 993 /* Downstream unplug */ 994 dc_sink_release(prev_sink); 995 return true; 996 } 997 998 /* disable audio for non DP to HDMI active sst converter */ 999 if (link->type == dc_connection_sst_branch && 1000 is_dp_active_dongle(link) && 1001 (link->dpcd_caps.dongle_type != 1002 DISPLAY_DONGLE_DP_HDMI_CONVERTER)) 1003 converter_disable_audio = true; 1004 1005 /* limited link rate to HBR3 for DPIA until we implement USB4 V2 */ 1006 if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA && 1007 link->reported_link_cap.link_rate > LINK_RATE_HIGH3) 1008 link->reported_link_cap.link_rate = LINK_RATE_HIGH3; 1009 1010 /* 1011 * If this is DP over USB4 link then we need to: 1012 * - Enable BW ALLOC support on DPtx if applicable 1013 */ 1014 if (dc->config.usb4_bw_alloc_support) { 1015 if (link_dp_dpia_set_dptx_usb4_bw_alloc_support(link)) { 1016 /* update with non reduced link cap if bw allocation mode is supported */ 1017 if (link->dpia_bw_alloc_config.nrd_max_link_rate && 1018 link->dpia_bw_alloc_config.nrd_max_lane_count) { 1019 link->reported_link_cap.link_rate = 1020 link->dpia_bw_alloc_config.nrd_max_link_rate; 1021 link->reported_link_cap.lane_count = 1022 link->dpia_bw_alloc_config.nrd_max_lane_count; 1023 } 1024 } 1025 } 1026 break; 1027 } 1028 1029 default: 1030 DC_ERROR("Invalid connector type! signal:%d\n", 1031 link->connector_signal); 1032 if (prev_sink) 1033 dc_sink_release(prev_sink); 1034 return false; 1035 } /* switch() */ 1036 1037 if (link->dpcd_caps.sink_count.bits.SINK_COUNT) 1038 link->dpcd_sink_count = 1039 link->dpcd_caps.sink_count.bits.SINK_COUNT; 1040 else 1041 link->dpcd_sink_count = 1; 1042 1043 set_ddc_transaction_type(link->ddc, 1044 sink_caps.transaction_type); 1045 1046 link->aux_mode = 1047 link_is_in_aux_transaction_mode(link->ddc); 1048 1049 sink_init_data.link = link; 1050 sink_init_data.sink_signal = sink_caps.signal; 1051 1052 sink = dc_sink_create(&sink_init_data); 1053 if (!sink) { 1054 DC_ERROR("Failed to create sink!\n"); 1055 if (prev_sink) 1056 dc_sink_release(prev_sink); 1057 return false; 1058 } 1059 1060 sink->link->dongle_max_pix_clk = sink_caps.max_hdmi_pixel_clock; 1061 sink->converter_disable_audio = converter_disable_audio; 1062 1063 /* dc_sink_create returns a new reference */ 1064 link->local_sink = sink; 1065 1066 edid_status = dm_helpers_read_local_edid(link->ctx, 1067 link, sink); 1068 1069 switch (edid_status) { 1070 case EDID_BAD_CHECKSUM: 1071 DC_LOG_ERROR("EDID checksum invalid.\n"); 1072 break; 1073 case EDID_PARTIAL_VALID: 1074 DC_LOG_ERROR("Partial EDID valid, abandon invalid blocks.\n"); 1075 break; 1076 case EDID_NO_RESPONSE: 1077 DC_LOG_ERROR("No EDID read.\n"); 1078 /* 1079 * Abort detection for non-DP connectors if we have 1080 * no EDID 1081 * 1082 * DP needs to report as connected if HDP is high 1083 * even if we have no EDID in order to go to 1084 * fail-safe mode 1085 */ 1086 if (dc_is_hdmi_signal(link->connector_signal) || 1087 dc_is_dvi_signal(link->connector_signal)) { 1088 if (prev_sink) 1089 dc_sink_release(prev_sink); 1090 1091 return false; 1092 } 1093 1094 if (link->type == dc_connection_sst_branch && 1095 link->dpcd_caps.dongle_type == 1096 DISPLAY_DONGLE_DP_VGA_CONVERTER && 1097 reason == DETECT_REASON_HPDRX) { 1098 /* Abort detection for DP-VGA adapters when EDID 1099 * can't be read and detection reason is VGA-side 1100 * hotplug 1101 */ 1102 if (prev_sink) 1103 dc_sink_release(prev_sink); 1104 link_disconnect_sink(link); 1105 1106 return true; 1107 } 1108 1109 break; 1110 default: 1111 break; 1112 } 1113 1114 // Check if edid is the same 1115 if ((prev_sink) && 1116 (edid_status == EDID_THE_SAME || edid_status == EDID_OK)) 1117 same_edid = is_same_edid(&prev_sink->dc_edid, 1118 &sink->dc_edid); 1119 1120 if (sink->edid_caps.panel_patch.skip_scdc_overwrite) 1121 link->ctx->dc->debug.hdmi20_disable = true; 1122 1123 if (sink->edid_caps.panel_patch.remove_sink_ext_caps) 1124 link->dpcd_sink_ext_caps.raw = 0; 1125 1126 if (dc_is_hdmi_signal(link->connector_signal)) 1127 read_scdc_caps(link->ddc, link->local_sink); 1128 1129 if (link->connector_signal == SIGNAL_TYPE_DISPLAY_PORT && 1130 sink_caps.transaction_type == 1131 DDC_TRANSACTION_TYPE_I2C_OVER_AUX) { 1132 /* 1133 * TODO debug why certain monitors don't like 1134 * two link trainings 1135 */ 1136 query_hdcp_capability(sink->sink_signal, link); 1137 } else { 1138 // If edid is the same, then discard new sink and revert back to original sink 1139 if (same_edid) { 1140 link_disconnect_remap(prev_sink, link); 1141 sink = prev_sink; 1142 prev_sink = NULL; 1143 } 1144 query_hdcp_capability(sink->sink_signal, link); 1145 } 1146 1147 /* HDMI-DVI Dongle */ 1148 if (sink->sink_signal == SIGNAL_TYPE_HDMI_TYPE_A && 1149 !sink->edid_caps.edid_hdmi) 1150 sink->sink_signal = SIGNAL_TYPE_DVI_SINGLE_LINK; 1151 1152 if (link->local_sink && dc_is_dp_signal(sink_caps.signal)) 1153 dp_trace_init(link); 1154 1155 /* Connectivity log: detection */ 1156 for (i = 0; i < sink->dc_edid.length / DC_EDID_BLOCK_SIZE; i++) { 1157 CONN_DATA_DETECT(link, 1158 &sink->dc_edid.raw_edid[i * DC_EDID_BLOCK_SIZE], 1159 DC_EDID_BLOCK_SIZE, 1160 "%s: [Block %d] ", sink->edid_caps.display_name, i); 1161 } 1162 1163 DC_LOG_DETECTION_EDID_PARSER("%s: " 1164 "manufacturer_id = %X, " 1165 "product_id = %X, " 1166 "serial_number = %X, " 1167 "manufacture_week = %d, " 1168 "manufacture_year = %d, " 1169 "display_name = %s, " 1170 "speaker_flag = %d, " 1171 "audio_mode_count = %d\n", 1172 __func__, 1173 sink->edid_caps.manufacturer_id, 1174 sink->edid_caps.product_id, 1175 sink->edid_caps.serial_number, 1176 sink->edid_caps.manufacture_week, 1177 sink->edid_caps.manufacture_year, 1178 sink->edid_caps.display_name, 1179 sink->edid_caps.speaker_flags, 1180 sink->edid_caps.audio_mode_count); 1181 1182 for (i = 0; i < sink->edid_caps.audio_mode_count; i++) { 1183 DC_LOG_DETECTION_EDID_PARSER("%s: mode number = %d, " 1184 "format_code = %d, " 1185 "channel_count = %d, " 1186 "sample_rate = %d, " 1187 "sample_size = %d\n", 1188 __func__, 1189 i, 1190 sink->edid_caps.audio_modes[i].format_code, 1191 sink->edid_caps.audio_modes[i].channel_count, 1192 sink->edid_caps.audio_modes[i].sample_rate, 1193 sink->edid_caps.audio_modes[i].sample_size); 1194 } 1195 1196 if (link->connector_signal == SIGNAL_TYPE_EDP) { 1197 // Init dc_panel_config by HW config 1198 if (dc_ctx->dc->res_pool->funcs->get_panel_config_defaults) 1199 dc_ctx->dc->res_pool->funcs->get_panel_config_defaults(&link->panel_config); 1200 // Pickup base DM settings 1201 dm_helpers_init_panel_settings(dc_ctx, &link->panel_config, sink); 1202 // Override dc_panel_config if system has specific settings 1203 dm_helpers_override_panel_settings(dc_ctx, &link->panel_config); 1204 1205 //sink only can use supported link rate table, we are foreced to enable it 1206 if (link->reported_link_cap.link_rate == LINK_RATE_UNKNOWN) 1207 link->panel_config.ilr.optimize_edp_link_rate = true; 1208 link->reported_link_cap.link_rate = get_max_edp_link_rate(link); 1209 } 1210 1211 } else { 1212 /* From Connected-to-Disconnected. */ 1213 link->type = dc_connection_none; 1214 sink_caps.signal = SIGNAL_TYPE_NONE; 1215 memset(&link->hdcp_caps, 0, sizeof(struct hdcp_caps)); 1216 /* When we unplug a passive DP-HDMI dongle connection, dongle_max_pix_clk 1217 * is not cleared. If we emulate a DP signal on this connection, it thinks 1218 * the dongle is still there and limits the number of modes we can emulate. 1219 * Clear dongle_max_pix_clk on disconnect to fix this 1220 */ 1221 link->dongle_max_pix_clk = 0; 1222 1223 dc_link_clear_dprx_states(link); 1224 dp_trace_reset(link); 1225 } 1226 1227 LINK_INFO("link=%d, dc_sink_in=%p is now %s prev_sink=%p edid same=%d\n", 1228 link->link_index, sink, 1229 (sink_caps.signal == 1230 SIGNAL_TYPE_NONE ? "Disconnected" : "Connected"), 1231 prev_sink, same_edid); 1232 1233 if (prev_sink) 1234 dc_sink_release(prev_sink); 1235 1236 return true; 1237 } 1238 1239 /* 1240 * link_detect_connection_type() - Determine if there is a sink connected 1241 * 1242 * @type: Returned connection type 1243 * Does not detect downstream devices, such as MST sinks 1244 * or display connected through active dongles 1245 */ 1246 bool link_detect_connection_type(struct dc_link *link, enum dc_connection_type *type) 1247 { 1248 uint32_t is_hpd_high = 0; 1249 1250 if (link->connector_signal == SIGNAL_TYPE_LVDS) { 1251 *type = dc_connection_single; 1252 return true; 1253 } 1254 1255 if (link->connector_signal == SIGNAL_TYPE_EDP) { 1256 /*in case it is not on*/ 1257 if (!link->dc->config.edp_no_power_sequencing) 1258 link->dc->hwss.edp_power_control(link, true); 1259 link->dc->hwss.edp_wait_for_hpd_ready(link, true); 1260 } 1261 1262 /* Link may not have physical HPD pin. */ 1263 if (link->ep_type != DISPLAY_ENDPOINT_PHY) { 1264 if (link->is_hpd_pending || !dpia_query_hpd_status(link)) 1265 *type = dc_connection_none; 1266 else 1267 *type = dc_connection_single; 1268 1269 return true; 1270 } 1271 1272 1273 if (!query_hpd_status(link, &is_hpd_high)) 1274 goto hpd_gpio_failure; 1275 1276 if (is_hpd_high) { 1277 *type = dc_connection_single; 1278 /* TODO: need to do the actual detection */ 1279 } else { 1280 *type = dc_connection_none; 1281 if (link->connector_signal == SIGNAL_TYPE_EDP) { 1282 /* eDP is not connected, power down it */ 1283 if (!link->dc->config.edp_no_power_sequencing) 1284 link->dc->hwss.edp_power_control(link, false); 1285 } 1286 } 1287 1288 return true; 1289 1290 hpd_gpio_failure: 1291 return false; 1292 } 1293 1294 bool link_detect(struct dc_link *link, enum dc_detect_reason reason) 1295 { 1296 bool is_local_sink_detect_success; 1297 bool is_delegated_to_mst_top_mgr = false; 1298 enum dc_connection_type pre_link_type = link->type; 1299 1300 DC_LOGGER_INIT(link->ctx->logger); 1301 1302 is_local_sink_detect_success = detect_link_and_local_sink(link, reason); 1303 1304 if (is_local_sink_detect_success && link->local_sink) 1305 verify_link_capability(link, link->local_sink, reason); 1306 1307 DC_LOG_DC("%s: link_index=%d is_local_sink_detect_success=%d pre_link_type=%d link_type=%d\n", __func__, 1308 link->link_index, is_local_sink_detect_success, pre_link_type, link->type); 1309 1310 if (is_local_sink_detect_success && link->local_sink && 1311 dc_is_dp_signal(link->local_sink->sink_signal) && 1312 link->dpcd_caps.is_mst_capable) 1313 is_delegated_to_mst_top_mgr = discover_dp_mst_topology(link, reason); 1314 1315 if (pre_link_type == dc_connection_mst_branch && 1316 link->type != dc_connection_mst_branch) 1317 is_delegated_to_mst_top_mgr = link_reset_cur_dp_mst_topology(link); 1318 1319 return is_local_sink_detect_success && !is_delegated_to_mst_top_mgr; 1320 } 1321 1322 void link_clear_dprx_states(struct dc_link *link) 1323 { 1324 memset(&link->dprx_states, 0, sizeof(link->dprx_states)); 1325 } 1326 1327 bool link_is_hdcp14(struct dc_link *link, enum signal_type signal) 1328 { 1329 bool ret = false; 1330 1331 switch (signal) { 1332 case SIGNAL_TYPE_DISPLAY_PORT: 1333 case SIGNAL_TYPE_DISPLAY_PORT_MST: 1334 ret = link->hdcp_caps.bcaps.bits.HDCP_CAPABLE; 1335 break; 1336 case SIGNAL_TYPE_DVI_SINGLE_LINK: 1337 case SIGNAL_TYPE_DVI_DUAL_LINK: 1338 case SIGNAL_TYPE_HDMI_TYPE_A: 1339 /* HDMI doesn't tell us its HDCP(1.4) capability, so assume to always be capable, 1340 * we can poll for bksv but some displays have an issue with this. Since its so rare 1341 * for a display to not be 1.4 capable, this assumtion is ok 1342 */ 1343 ret = true; 1344 break; 1345 default: 1346 break; 1347 } 1348 return ret; 1349 } 1350 1351 bool link_is_hdcp22(struct dc_link *link, enum signal_type signal) 1352 { 1353 bool ret = false; 1354 1355 switch (signal) { 1356 case SIGNAL_TYPE_DISPLAY_PORT: 1357 case SIGNAL_TYPE_DISPLAY_PORT_MST: 1358 ret = (link->hdcp_caps.bcaps.bits.HDCP_CAPABLE && 1359 link->hdcp_caps.rx_caps.fields.byte0.hdcp_capable && 1360 (link->hdcp_caps.rx_caps.fields.version == 0x2)) ? 1 : 0; 1361 break; 1362 case SIGNAL_TYPE_DVI_SINGLE_LINK: 1363 case SIGNAL_TYPE_DVI_DUAL_LINK: 1364 case SIGNAL_TYPE_HDMI_TYPE_A: 1365 ret = (link->hdcp_caps.rx_caps.fields.version == 0x4) ? 1:0; 1366 break; 1367 default: 1368 break; 1369 } 1370 1371 return ret; 1372 } 1373 1374 const struct dc_link_status *link_get_status(const struct dc_link *link) 1375 { 1376 return &link->link_status; 1377 } 1378 1379 1380 static bool link_add_remote_sink_helper(struct dc_link *dc_link, struct dc_sink *sink) 1381 { 1382 if (dc_link->sink_count >= MAX_SINKS_PER_LINK) { 1383 BREAK_TO_DEBUGGER(); 1384 return false; 1385 } 1386 1387 dc_sink_retain(sink); 1388 1389 dc_link->remote_sinks[dc_link->sink_count] = sink; 1390 dc_link->sink_count++; 1391 1392 return true; 1393 } 1394 1395 struct dc_sink *link_add_remote_sink( 1396 struct dc_link *link, 1397 const uint8_t *edid, 1398 int len, 1399 struct dc_sink_init_data *init_data) 1400 { 1401 struct dc_sink *dc_sink; 1402 enum dc_edid_status edid_status; 1403 1404 if (len > DC_MAX_EDID_BUFFER_SIZE) { 1405 dm_error("Max EDID buffer size breached!\n"); 1406 return NULL; 1407 } 1408 1409 if (!init_data) { 1410 BREAK_TO_DEBUGGER(); 1411 return NULL; 1412 } 1413 1414 if (!init_data->link) { 1415 BREAK_TO_DEBUGGER(); 1416 return NULL; 1417 } 1418 1419 dc_sink = dc_sink_create(init_data); 1420 1421 if (!dc_sink) 1422 return NULL; 1423 1424 memmove(dc_sink->dc_edid.raw_edid, edid, len); 1425 dc_sink->dc_edid.length = len; 1426 1427 if (!link_add_remote_sink_helper( 1428 link, 1429 dc_sink)) 1430 goto fail_add_sink; 1431 1432 edid_status = dm_helpers_parse_edid_caps( 1433 link, 1434 &dc_sink->dc_edid, 1435 &dc_sink->edid_caps); 1436 1437 /* 1438 * Treat device as no EDID device if EDID 1439 * parsing fails 1440 */ 1441 if (edid_status != EDID_OK && edid_status != EDID_PARTIAL_VALID) { 1442 dc_sink->dc_edid.length = 0; 1443 dm_error("Bad EDID, status%d!\n", edid_status); 1444 } 1445 1446 return dc_sink; 1447 1448 fail_add_sink: 1449 dc_sink_release(dc_sink); 1450 return NULL; 1451 } 1452 1453 void link_remove_remote_sink(struct dc_link *link, struct dc_sink *sink) 1454 { 1455 int i; 1456 1457 if (!link->sink_count) { 1458 BREAK_TO_DEBUGGER(); 1459 return; 1460 } 1461 1462 for (i = 0; i < link->sink_count; i++) { 1463 if (link->remote_sinks[i] == sink) { 1464 dc_sink_release(sink); 1465 link->remote_sinks[i] = NULL; 1466 1467 /* shrink array to remove empty place */ 1468 while (i < link->sink_count - 1) { 1469 link->remote_sinks[i] = link->remote_sinks[i+1]; 1470 i++; 1471 } 1472 link->remote_sinks[i] = NULL; 1473 link->sink_count--; 1474 return; 1475 } 1476 } 1477 } 1478