drivers/gpu/drm/i915/display/intel_tc.c

   1 // SPDX-License-Identifier: MIT
   2 /*
   3  * Copyright © 2019 Intel Corporation
   4  */
   5
   6 #include "i915_drv.h"
   7 #include "intel_display.h"
   8 #include "intel_display_types.h"
   9 #include "intel_dp_mst.h"
  10 #include "intel_tc.h"
  11
  12 static const char *tc_port_mode_name(enum tc_port_mode mode)
  13 {
  14         static const char * const names[] = {
  15                 [TC_PORT_TBT_ALT] = "tbt-alt",
  16                 [TC_PORT_DP_ALT] = "dp-alt",
  17                 [TC_PORT_LEGACY] = "legacy",
  18         };
  19
  20         if (WARN_ON(mode >= ARRAY_SIZE(names)))
  21                 mode = TC_PORT_TBT_ALT;
  22
  23         return names[mode];
  24 }
  25
  26 static void
  27 tc_port_load_fia_params(struct drm_i915_private *i915,
  28                         struct intel_digital_port *dig_port)
  29 {
  30         enum port port = dig_port->base.port;
  31         enum tc_port tc_port = intel_port_to_tc(i915, port);
  32         u32 modular_fia;
  33
  34         if (INTEL_INFO(i915)->display.has_modular_fia) {
  35                 modular_fia = intel_uncore_read(&i915->uncore,
  36                                                 PORT_TX_DFLEXDPSP(FIA1));
  37                 drm_WARN_ON(&i915->drm, modular_fia == 0xffffffff);
  38                 modular_fia &= MODULAR_FIA_MASK;
  39         } else {
  40                 modular_fia = 0;
  41         }
  42
  43         /*
  44          * Each Modular FIA instance houses 2 TC ports. In SOC that has more
  45          * than two TC ports, there are multiple instances of Modular FIA.
  46          */
  47         if (modular_fia) {
  48                 dig_port->tc_phy_fia = tc_port / 2;
  49                 dig_port->tc_phy_fia_idx = tc_port % 2;
  50         } else {
  51                 dig_port->tc_phy_fia = FIA1;
  52                 dig_port->tc_phy_fia_idx = tc_port;
  53         }
  54 }
  55
  56 static enum intel_display_power_domain
  57 tc_cold_get_power_domain(struct intel_digital_port *dig_port)
  58 {
  59         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
  60
  61         if (INTEL_GEN(i915) == 11)
  62                 return intel_legacy_aux_to_power_domain(dig_port->aux_ch);
  63         else
  64                 return POWER_DOMAIN_TC_COLD_OFF;
  65 }
  66
  67 static intel_wakeref_t
  68 tc_cold_block(struct intel_digital_port *dig_port)
  69 {
  70         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
  71         enum intel_display_power_domain domain;
  72
  73         if (INTEL_GEN(i915) == 11 && !dig_port->tc_legacy_port)
  74                 return 0;
  75
  76         domain = tc_cold_get_power_domain(dig_port);
  77         return intel_display_power_get(i915, domain);
  78 }
  79
  80 static void
  81 tc_cold_unblock(struct intel_digital_port *dig_port, intel_wakeref_t wakeref)
  82 {
  83         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
  84         enum intel_display_power_domain domain;
  85
  86         /*
  87          * wakeref == -1, means some error happened saving save_depot_stack but
  88          * power should still be put down and 0 is a invalid save_depot_stack
  89          * id so can be used to skip it for non TC legacy ports.
  90          */
  91         if (wakeref == 0)
  92                 return;
  93
  94         domain = tc_cold_get_power_domain(dig_port);
  95         intel_display_power_put_async(i915, domain, wakeref);
  96 }
  97
  98 static void
  99 assert_tc_cold_blocked(struct intel_digital_port *dig_port)
 100 {
 101         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 102         bool enabled;
 103
 104         if (INTEL_GEN(i915) == 11 && !dig_port->tc_legacy_port)
 105                 return;
 106
 107         enabled = intel_display_power_is_enabled(i915,
 108                                                  tc_cold_get_power_domain(dig_port));
 109         drm_WARN_ON(&i915->drm, !enabled);
 110 }
 111
 112 u32 intel_tc_port_get_lane_mask(struct intel_digital_port *dig_port)
 113 {
 114         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 115         struct intel_uncore *uncore = &i915->uncore;
 116         u32 lane_mask;
 117
 118         lane_mask = intel_uncore_read(uncore,
 119                                       PORT_TX_DFLEXDPSP(dig_port->tc_phy_fia));
 120
 121         drm_WARN_ON(&i915->drm, lane_mask == 0xffffffff);
 122         assert_tc_cold_blocked(dig_port);
 123
 124         lane_mask &= DP_LANE_ASSIGNMENT_MASK(dig_port->tc_phy_fia_idx);
 125         return lane_mask >> DP_LANE_ASSIGNMENT_SHIFT(dig_port->tc_phy_fia_idx);
 126 }
 127
 128 u32 intel_tc_port_get_pin_assignment_mask(struct intel_digital_port *dig_port)
 129 {
 130         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 131         struct intel_uncore *uncore = &i915->uncore;
 132         u32 pin_mask;
 133
 134         pin_mask = intel_uncore_read(uncore,
 135                                      PORT_TX_DFLEXPA1(dig_port->tc_phy_fia));
 136
 137         drm_WARN_ON(&i915->drm, pin_mask == 0xffffffff);
 138         assert_tc_cold_blocked(dig_port);
 139
 140         return (pin_mask & DP_PIN_ASSIGNMENT_MASK(dig_port->tc_phy_fia_idx)) >>
 141                DP_PIN_ASSIGNMENT_SHIFT(dig_port->tc_phy_fia_idx);
 142 }
 143
 144 int intel_tc_port_fia_max_lane_count(struct intel_digital_port *dig_port)
 145 {
 146         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 147         intel_wakeref_t wakeref;
 148         u32 lane_mask;
 149
 150         if (dig_port->tc_mode != TC_PORT_DP_ALT)
 151                 return 4;
 152
 153         assert_tc_cold_blocked(dig_port);
 154
 155         lane_mask = 0;
 156         with_intel_display_power(i915, POWER_DOMAIN_DISPLAY_CORE, wakeref)
 157                 lane_mask = intel_tc_port_get_lane_mask(dig_port);
 158
 159         switch (lane_mask) {
 160         default:
 161                 MISSING_CASE(lane_mask);
 162                 fallthrough;
 163         case 0x1:
 164         case 0x2:
 165         case 0x4:
 166         case 0x8:
 167                 return 1;
 168         case 0x3:
 169         case 0xc:
 170                 return 2;
 171         case 0xf:
 172                 return 4;
 173         }
 174 }
 175
 176 void intel_tc_port_set_fia_lane_count(struct intel_digital_port *dig_port,
 177                                       int required_lanes)
 178 {
 179         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 180         bool lane_reversal = dig_port->saved_port_bits & DDI_BUF_PORT_REVERSAL;
 181         struct intel_uncore *uncore = &i915->uncore;
 182         u32 val;
 183
 184         drm_WARN_ON(&i915->drm,
 185                     lane_reversal && dig_port->tc_mode != TC_PORT_LEGACY);
 186
 187         assert_tc_cold_blocked(dig_port);
 188
 189         val = intel_uncore_read(uncore,
 190                                 PORT_TX_DFLEXDPMLE1(dig_port->tc_phy_fia));
 191         val &= ~DFLEXDPMLE1_DPMLETC_MASK(dig_port->tc_phy_fia_idx);
 192
 193         switch (required_lanes) {
 194         case 1:
 195                 val |= lane_reversal ?
 196                         DFLEXDPMLE1_DPMLETC_ML3(dig_port->tc_phy_fia_idx) :
 197                         DFLEXDPMLE1_DPMLETC_ML0(dig_port->tc_phy_fia_idx);
 198                 break;
 199         case 2:
 200                 val |= lane_reversal ?
 201                         DFLEXDPMLE1_DPMLETC_ML3_2(dig_port->tc_phy_fia_idx) :
 202                         DFLEXDPMLE1_DPMLETC_ML1_0(dig_port->tc_phy_fia_idx);
 203                 break;
 204         case 4:
 205                 val |= DFLEXDPMLE1_DPMLETC_ML3_0(dig_port->tc_phy_fia_idx);
 206                 break;
 207         default:
 208                 MISSING_CASE(required_lanes);
 209         }
 210
 211         intel_uncore_write(uncore,
 212                            PORT_TX_DFLEXDPMLE1(dig_port->tc_phy_fia), val);
 213 }
 214
 215 static void tc_port_fixup_legacy_flag(struct intel_digital_port *dig_port,
 216                                       u32 live_status_mask)
 217 {
 218         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 219         u32 valid_hpd_mask;
 220
 221         if (dig_port->tc_legacy_port)
 222                 valid_hpd_mask = BIT(TC_PORT_LEGACY);
 223         else
 224                 valid_hpd_mask = BIT(TC_PORT_DP_ALT) |
 225                                  BIT(TC_PORT_TBT_ALT);
 226
 227         if (!(live_status_mask & ~valid_hpd_mask))
 228                 return;
 229
 230         /* If live status mismatches the VBT flag, trust the live status. */
 231         drm_dbg_kms(&i915->drm,
 232                     "Port %s: live status %08x mismatches the legacy port flag %08x, fixing flag\n",
 233                     dig_port->tc_port_name, live_status_mask, valid_hpd_mask);
 234
 235         dig_port->tc_legacy_port = !dig_port->tc_legacy_port;
 236 }
 237
 238 static u32 tc_port_live_status_mask(struct intel_digital_port *dig_port)
 239 {
 240         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 241         struct intel_uncore *uncore = &i915->uncore;
 242         u32 isr_bit = i915->hotplug.pch_hpd[dig_port->base.hpd_pin];
 243         u32 mask = 0;
 244         u32 val;
 245
 246         val = intel_uncore_read(uncore,
 247                                 PORT_TX_DFLEXDPSP(dig_port->tc_phy_fia));
 248
 249         if (val == 0xffffffff) {
 250                 drm_dbg_kms(&i915->drm,
 251                             "Port %s: PHY in TCCOLD, nothing connected\n",
 252                             dig_port->tc_port_name);
 253                 return mask;
 254         }
 255
 256         if (val & TC_LIVE_STATE_TBT(dig_port->tc_phy_fia_idx))
 257                 mask |= BIT(TC_PORT_TBT_ALT);
 258         if (val & TC_LIVE_STATE_TC(dig_port->tc_phy_fia_idx))
 259                 mask |= BIT(TC_PORT_DP_ALT);
 260
 261         if (intel_uncore_read(uncore, SDEISR) & isr_bit)
 262                 mask |= BIT(TC_PORT_LEGACY);
 263
 264         /* The sink can be connected only in a single mode. */
 265         if (!drm_WARN_ON(&i915->drm, hweight32(mask) > 1))
 266                 tc_port_fixup_legacy_flag(dig_port, mask);
 267
 268         return mask;
 269 }
 270
 271 static bool icl_tc_phy_status_complete(struct intel_digital_port *dig_port)
 272 {
 273         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 274         struct intel_uncore *uncore = &i915->uncore;
 275         u32 val;
 276
 277         val = intel_uncore_read(uncore,
 278                                 PORT_TX_DFLEXDPPMS(dig_port->tc_phy_fia));
 279         if (val == 0xffffffff) {
 280                 drm_dbg_kms(&i915->drm,
 281                             "Port %s: PHY in TCCOLD, assuming not complete\n",
 282                             dig_port->tc_port_name);
 283                 return false;
 284         }
 285
 286         return val & DP_PHY_MODE_STATUS_COMPLETED(dig_port->tc_phy_fia_idx);
 287 }
 288
 289 static bool icl_tc_phy_set_safe_mode(struct intel_digital_port *dig_port,
 290                                      bool enable)
 291 {
 292         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 293         struct intel_uncore *uncore = &i915->uncore;
 294         u32 val;
 295
 296         val = intel_uncore_read(uncore,
 297                                 PORT_TX_DFLEXDPCSSS(dig_port->tc_phy_fia));
 298         if (val == 0xffffffff) {
 299                 drm_dbg_kms(&i915->drm,
 300                             "Port %s: PHY in TCCOLD, can't set safe-mode to %s\n",
 301                             dig_port->tc_port_name, enableddisabled(enable));
 302
 303                 return false;
 304         }
 305
 306         val &= ~DP_PHY_MODE_STATUS_NOT_SAFE(dig_port->tc_phy_fia_idx);
 307         if (!enable)
 308                 val |= DP_PHY_MODE_STATUS_NOT_SAFE(dig_port->tc_phy_fia_idx);
 309
 310         intel_uncore_write(uncore,
 311                            PORT_TX_DFLEXDPCSSS(dig_port->tc_phy_fia), val);
 312
 313         if (enable && wait_for(!icl_tc_phy_status_complete(dig_port), 10))
 314                 drm_dbg_kms(&i915->drm,
 315                             "Port %s: PHY complete clear timed out\n",
 316                             dig_port->tc_port_name);
 317
 318         return true;
 319 }
 320
 321 static bool icl_tc_phy_is_in_safe_mode(struct intel_digital_port *dig_port)
 322 {
 323         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 324         struct intel_uncore *uncore = &i915->uncore;
 325         u32 val;
 326
 327         val = intel_uncore_read(uncore,
 328                                 PORT_TX_DFLEXDPCSSS(dig_port->tc_phy_fia));
 329         if (val == 0xffffffff) {
 330                 drm_dbg_kms(&i915->drm,
 331                             "Port %s: PHY in TCCOLD, assume safe mode\n",
 332                             dig_port->tc_port_name);
 333                 return true;
 334         }
 335
 336         return !(val & DP_PHY_MODE_STATUS_NOT_SAFE(dig_port->tc_phy_fia_idx));
 337 }
 338
 339 /*
 340  * This function implements the first part of the Connect Flow described by our
 341  * specification, Gen11 TypeC Programming chapter. The rest of the flow (reading
 342  * lanes, EDID, etc) is done as needed in the typical places.
 343  *
 344  * Unlike the other ports, type-C ports are not available to use as soon as we
 345  * get a hotplug. The type-C PHYs can be shared between multiple controllers:
 346  * display, USB, etc. As a result, handshaking through FIA is required around
 347  * connect and disconnect to cleanly transfer ownership with the controller and
 348  * set the type-C power state.
 349  */
 350 static void icl_tc_phy_connect(struct intel_digital_port *dig_port,
 351                                int required_lanes)
 352 {
 353         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 354         int max_lanes;
 355
 356         if (!icl_tc_phy_status_complete(dig_port)) {
 357                 drm_dbg_kms(&i915->drm, "Port %s: PHY not ready\n",
 358                             dig_port->tc_port_name);
 359                 goto out_set_tbt_alt_mode;
 360         }
 361
 362         if (!icl_tc_phy_set_safe_mode(dig_port, false) &&
 363             !drm_WARN_ON(&i915->drm, dig_port->tc_legacy_port))
 364                 goto out_set_tbt_alt_mode;
 365
 366         max_lanes = intel_tc_port_fia_max_lane_count(dig_port);
 367         if (dig_port->tc_legacy_port) {
 368                 drm_WARN_ON(&i915->drm, max_lanes != 4);
 369                 dig_port->tc_mode = TC_PORT_LEGACY;
 370
 371                 return;
 372         }
 373
 374         /*
 375          * Now we have to re-check the live state, in case the port recently
 376          * became disconnected. Not necessary for legacy mode.
 377          */
 378         if (!(tc_port_live_status_mask(dig_port) & BIT(TC_PORT_DP_ALT))) {
 379                 drm_dbg_kms(&i915->drm, "Port %s: PHY sudden disconnect\n",
 380                             dig_port->tc_port_name);
 381                 goto out_set_safe_mode;
 382         }
 383
 384         if (max_lanes < required_lanes) {
 385                 drm_dbg_kms(&i915->drm,
 386                             "Port %s: PHY max lanes %d < required lanes %d\n",
 387                             dig_port->tc_port_name,
 388                             max_lanes, required_lanes);
 389                 goto out_set_safe_mode;
 390         }
 391
 392         dig_port->tc_mode = TC_PORT_DP_ALT;
 393
 394         return;
 395
 396 out_set_safe_mode:
 397         icl_tc_phy_set_safe_mode(dig_port, true);
 398 out_set_tbt_alt_mode:
 399         dig_port->tc_mode = TC_PORT_TBT_ALT;
 400 }
 401
 402 /*
 403  * See the comment at the connect function. This implements the Disconnect
 404  * Flow.
 405  */
 406 static void icl_tc_phy_disconnect(struct intel_digital_port *dig_port)
 407 {
 408         switch (dig_port->tc_mode) {
 409         case TC_PORT_LEGACY:
 410                 /* Nothing to do, we never disconnect from legacy mode */
 411                 break;
 412         case TC_PORT_DP_ALT:
 413                 icl_tc_phy_set_safe_mode(dig_port, true);
 414                 dig_port->tc_mode = TC_PORT_TBT_ALT;
 415                 break;
 416         case TC_PORT_TBT_ALT:
 417                 /* Nothing to do, we stay in TBT-alt mode */
 418                 break;
 419         default:
 420                 MISSING_CASE(dig_port->tc_mode);
 421         }
 422 }
 423
 424 static bool icl_tc_phy_is_connected(struct intel_digital_port *dig_port)
 425 {
 426         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 427
 428         if (!icl_tc_phy_status_complete(dig_port)) {
 429                 drm_dbg_kms(&i915->drm, "Port %s: PHY status not complete\n",
 430                             dig_port->tc_port_name);
 431                 return dig_port->tc_mode == TC_PORT_TBT_ALT;
 432         }
 433
 434         if (icl_tc_phy_is_in_safe_mode(dig_port)) {
 435                 drm_dbg_kms(&i915->drm, "Port %s: PHY still in safe mode\n",
 436                             dig_port->tc_port_name);
 437
 438                 return false;
 439         }
 440
 441         return dig_port->tc_mode == TC_PORT_DP_ALT ||
 442                dig_port->tc_mode == TC_PORT_LEGACY;
 443 }
 444
 445 static enum tc_port_mode
 446 intel_tc_port_get_current_mode(struct intel_digital_port *dig_port)
 447 {
 448         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 449         u32 live_status_mask = tc_port_live_status_mask(dig_port);
 450         bool in_safe_mode = icl_tc_phy_is_in_safe_mode(dig_port);
 451         enum tc_port_mode mode;
 452
 453         if (in_safe_mode ||
 454             drm_WARN_ON(&i915->drm, !icl_tc_phy_status_complete(dig_port)))
 455                 return TC_PORT_TBT_ALT;
 456
 457         mode = dig_port->tc_legacy_port ? TC_PORT_LEGACY : TC_PORT_DP_ALT;
 458         if (live_status_mask) {
 459                 enum tc_port_mode live_mode = fls(live_status_mask) - 1;
 460
 461                 if (!drm_WARN_ON(&i915->drm, live_mode == TC_PORT_TBT_ALT))
 462                         mode = live_mode;
 463         }
 464
 465         return mode;
 466 }
 467
 468 static enum tc_port_mode
 469 intel_tc_port_get_target_mode(struct intel_digital_port *dig_port)
 470 {
 471         u32 live_status_mask = tc_port_live_status_mask(dig_port);
 472
 473         if (live_status_mask)
 474                 return fls(live_status_mask) - 1;
 475
 476         return icl_tc_phy_status_complete(dig_port) &&
 477                dig_port->tc_legacy_port ? TC_PORT_LEGACY :
 478                                           TC_PORT_TBT_ALT;
 479 }
 480
 481 static void intel_tc_port_reset_mode(struct intel_digital_port *dig_port,
 482                                      int required_lanes)
 483 {
 484         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 485         enum tc_port_mode old_tc_mode = dig_port->tc_mode;
 486
 487         intel_display_power_flush_work(i915);
 488         if (INTEL_GEN(i915) != 11 || !dig_port->tc_legacy_port) {
 489                 enum intel_display_power_domain aux_domain;
 490                 bool aux_powered;
 491
 492                 aux_domain = intel_aux_power_domain(dig_port);
 493                 aux_powered = intel_display_power_is_enabled(i915, aux_domain);
 494                 drm_WARN_ON(&i915->drm, aux_powered);
 495         }
 496
 497         icl_tc_phy_disconnect(dig_port);
 498         icl_tc_phy_connect(dig_port, required_lanes);
 499
 500         drm_dbg_kms(&i915->drm, "Port %s: TC port mode reset (%s -> %s)\n",
 501                     dig_port->tc_port_name,
 502                     tc_port_mode_name(old_tc_mode),
 503                     tc_port_mode_name(dig_port->tc_mode));
 504 }
 505
 506 static void
 507 intel_tc_port_link_init_refcount(struct intel_digital_port *dig_port,
 508                                  int refcount)
 509 {
 510         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 511
 512         drm_WARN_ON(&i915->drm, dig_port->tc_link_refcount);
 513         dig_port->tc_link_refcount = refcount;
 514 }
 515
 516 void intel_tc_port_sanitize(struct intel_digital_port *dig_port)
 517 {
 518         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 519         struct intel_encoder *encoder = &dig_port->base;
 520         intel_wakeref_t tc_cold_wref;
 521         int active_links = 0;
 522
 523         mutex_lock(&dig_port->tc_lock);
 524         tc_cold_wref = tc_cold_block(dig_port);
 525
 526         dig_port->tc_mode = intel_tc_port_get_current_mode(dig_port);
 527         if (dig_port->dp.is_mst)
 528                 active_links = intel_dp_mst_encoder_active_links(dig_port);
 529         else if (encoder->base.crtc)
 530                 active_links = to_intel_crtc(encoder->base.crtc)->active;
 531
 532         if (active_links) {
 533                 if (!icl_tc_phy_is_connected(dig_port))
 534                         drm_dbg_kms(&i915->drm,
 535                                     "Port %s: PHY disconnected with %d active link(s)\n",
 536                                     dig_port->tc_port_name, active_links);
 537                 intel_tc_port_link_init_refcount(dig_port, active_links);
 538
 539                 goto out;
 540         }
 541
 542         if (dig_port->tc_legacy_port)
 543                 icl_tc_phy_connect(dig_port, 1);
 544
 545 out:
 546         drm_dbg_kms(&i915->drm, "Port %s: sanitize mode (%s)\n",
 547                     dig_port->tc_port_name,
 548                     tc_port_mode_name(dig_port->tc_mode));
 549
 550         tc_cold_unblock(dig_port, tc_cold_wref);
 551         mutex_unlock(&dig_port->tc_lock);
 552 }
 553
 554 static bool intel_tc_port_needs_reset(struct intel_digital_port *dig_port)
 555 {
 556         return intel_tc_port_get_target_mode(dig_port) != dig_port->tc_mode;
 557 }
 558
 559 /*
 560  * The type-C ports are different because even when they are connected, they may
 561  * not be available/usable by the graphics driver: see the comment on
 562  * icl_tc_phy_connect(). So in our driver instead of adding the additional
 563  * concept of "usable" and make everything check for "connected and usable" we
 564  * define a port as "connected" when it is not only connected, but also when it
 565  * is usable by the rest of the driver. That maintains the old assumption that
 566  * connected ports are usable, and avoids exposing to the users objects they
 567  * can't really use.
 568  */
 569 bool intel_tc_port_connected(struct intel_encoder *encoder)
 570 {
 571         struct intel_digital_port *dig_port = enc_to_dig_port(encoder);
 572         bool is_connected;
 573         intel_wakeref_t tc_cold_wref;
 574
 575         intel_tc_port_lock(dig_port);
 576         tc_cold_wref = tc_cold_block(dig_port);
 577
 578         is_connected = tc_port_live_status_mask(dig_port) &
 579                        BIT(dig_port->tc_mode);
 580
 581         tc_cold_unblock(dig_port, tc_cold_wref);
 582         intel_tc_port_unlock(dig_port);
 583
 584         return is_connected;
 585 }
 586
 587 static void __intel_tc_port_lock(struct intel_digital_port *dig_port,
 588                                  int required_lanes)
 589 {
 590         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 591         intel_wakeref_t wakeref;
 592
 593         wakeref = intel_display_power_get(i915, POWER_DOMAIN_DISPLAY_CORE);
 594
 595         mutex_lock(&dig_port->tc_lock);
 596
 597         if (!dig_port->tc_link_refcount) {
 598                 intel_wakeref_t tc_cold_wref;
 599
 600                 tc_cold_wref = tc_cold_block(dig_port);
 601
 602                 if (intel_tc_port_needs_reset(dig_port))
 603                         intel_tc_port_reset_mode(dig_port, required_lanes);
 604
 605                 tc_cold_unblock(dig_port, tc_cold_wref);
 606         }
 607
 608         drm_WARN_ON(&i915->drm, dig_port->tc_lock_wakeref);
 609         dig_port->tc_lock_wakeref = wakeref;
 610 }
 611
 612 void intel_tc_port_lock(struct intel_digital_port *dig_port)
 613 {
 614         __intel_tc_port_lock(dig_port, 1);
 615 }
 616
 617 void intel_tc_port_unlock(struct intel_digital_port *dig_port)
 618 {
 619         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 620         intel_wakeref_t wakeref = fetch_and_zero(&dig_port->tc_lock_wakeref);
 621
 622         mutex_unlock(&dig_port->tc_lock);
 623
 624         intel_display_power_put_async(i915, POWER_DOMAIN_DISPLAY_CORE,
 625                                       wakeref);
 626 }
 627
 628 bool intel_tc_port_ref_held(struct intel_digital_port *dig_port)
 629 {
 630         return mutex_is_locked(&dig_port->tc_lock) ||
 631                dig_port->tc_link_refcount;
 632 }
 633
 634 void intel_tc_port_get_link(struct intel_digital_port *dig_port,
 635                             int required_lanes)
 636 {
 637         __intel_tc_port_lock(dig_port, required_lanes);
 638         dig_port->tc_link_refcount++;
 639         intel_tc_port_unlock(dig_port);
 640 }
 641
 642 void intel_tc_port_put_link(struct intel_digital_port *dig_port)
 643 {
 644         mutex_lock(&dig_port->tc_lock);
 645         dig_port->tc_link_refcount--;
 646         mutex_unlock(&dig_port->tc_lock);
 647 }
 648
 649 void intel_tc_port_init(struct intel_digital_port *dig_port, bool is_legacy)
 650 {
 651         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 652         enum port port = dig_port->base.port;
 653         enum tc_port tc_port = intel_port_to_tc(i915, port);
 654
 655         if (drm_WARN_ON(&i915->drm, tc_port == TC_PORT_NONE))
 656                 return;
 657
 658         snprintf(dig_port->tc_port_name, sizeof(dig_port->tc_port_name),
 659                  "%c/TC#%d", port_name(port), tc_port + 1);
 660
 661         mutex_init(&dig_port->tc_lock);
 662         dig_port->tc_legacy_port = is_legacy;
 663         dig_port->tc_link_refcount = 0;
 664         tc_port_load_fia_params(i915, dig_port);
 665 }