drivers/gpu/drm/amd/display/dc/link/link_detection.c

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