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

   1 // SPDX-License-Identifier: MIT
   2 /*
   3  * Copyright © 2020 Intel Corporation
   4  */
   5
   6 #include "g4x_dp.h"
   7 #include "i915_drv.h"
   8 #include "i915_reg.h"
   9 #include "intel_de.h"
  10 #include "intel_display_power_well.h"
  11 #include "intel_display_types.h"
  12 #include "intel_dp.h"
  13 #include "intel_dpio_phy.h"
  14 #include "intel_dpll.h"
  15 #include "intel_lvds.h"
  16 #include "intel_lvds_regs.h"
  17 #include "intel_pps.h"
  18 #include "intel_pps_regs.h"
  19 #include "intel_quirks.h"
  20
  21 static void vlv_steal_power_sequencer(struct drm_i915_private *dev_priv,
  22                                       enum pipe pipe);
  23
  24 static void pps_init_delays(struct intel_dp *intel_dp);
  25 static void pps_init_registers(struct intel_dp *intel_dp, bool force_disable_vdd);
  26
  27 static const char *pps_name(struct drm_i915_private *i915,
  28                             struct intel_pps *pps)
  29 {
  30         if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915)) {
  31                 switch (pps->pps_pipe) {
  32                 case INVALID_PIPE:
  33                         /*
  34                          * FIXME would be nice if we can guarantee
  35                          * to always have a valid PPS when calling this.
  36                          */
  37                         return "PPS <none>";
  38                 case PIPE_A:
  39                         return "PPS A";
  40                 case PIPE_B:
  41                         return "PPS B";
  42                 default:
  43                         MISSING_CASE(pps->pps_pipe);
  44                         break;
  45                 }
  46         } else {
  47                 switch (pps->pps_idx) {
  48                 case 0:
  49                         return "PPS 0";
  50                 case 1:
  51                         return "PPS 1";
  52                 default:
  53                         MISSING_CASE(pps->pps_idx);
  54                         break;
  55                 }
  56         }
  57
  58         return "PPS <invalid>";
  59 }
  60
  61 intel_wakeref_t intel_pps_lock(struct intel_dp *intel_dp)
  62 {
  63         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
  64         intel_wakeref_t wakeref;
  65
  66         /*
  67          * See intel_pps_reset_all() why we need a power domain reference here.
  68          */
  69         wakeref = intel_display_power_get(dev_priv, POWER_DOMAIN_DISPLAY_CORE);
  70         mutex_lock(&dev_priv->display.pps.mutex);
  71
  72         return wakeref;
  73 }
  74
  75 intel_wakeref_t intel_pps_unlock(struct intel_dp *intel_dp,
  76                                  intel_wakeref_t wakeref)
  77 {
  78         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
  79
  80         mutex_unlock(&dev_priv->display.pps.mutex);
  81         intel_display_power_put(dev_priv, POWER_DOMAIN_DISPLAY_CORE, wakeref);
  82
  83         return 0;
  84 }
  85
  86 static void
  87 vlv_power_sequencer_kick(struct intel_dp *intel_dp)
  88 {
  89         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
  90         struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
  91         enum pipe pipe = intel_dp->pps.pps_pipe;
  92         bool pll_enabled, release_cl_override = false;
  93         enum dpio_phy phy = DPIO_PHY(pipe);
  94         enum dpio_channel ch = vlv_pipe_to_channel(pipe);
  95         u32 DP;
  96
  97         if (drm_WARN(&dev_priv->drm,
  98                      intel_de_read(dev_priv, intel_dp->output_reg) & DP_PORT_EN,
  99                      "skipping %s kick due to [ENCODER:%d:%s] being active\n",
 100                      pps_name(dev_priv, &intel_dp->pps),
 101                      dig_port->base.base.base.id, dig_port->base.base.name))
 102                 return;
 103
 104         drm_dbg_kms(&dev_priv->drm,
 105                     "kicking %s for [ENCODER:%d:%s]\n",
 106                     pps_name(dev_priv, &intel_dp->pps),
 107                     dig_port->base.base.base.id, dig_port->base.base.name);
 108
 109         /* Preserve the BIOS-computed detected bit. This is
 110          * supposed to be read-only.
 111          */
 112         DP = intel_de_read(dev_priv, intel_dp->output_reg) & DP_DETECTED;
 113         DP |= DP_VOLTAGE_0_4 | DP_PRE_EMPHASIS_0;
 114         DP |= DP_PORT_WIDTH(1);
 115         DP |= DP_LINK_TRAIN_PAT_1;
 116
 117         if (IS_CHERRYVIEW(dev_priv))
 118                 DP |= DP_PIPE_SEL_CHV(pipe);
 119         else
 120                 DP |= DP_PIPE_SEL(pipe);
 121
 122         pll_enabled = intel_de_read(dev_priv, DPLL(pipe)) & DPLL_VCO_ENABLE;
 123
 124         /*
 125          * The DPLL for the pipe must be enabled for this to work.
 126          * So enable temporarily it if it's not already enabled.
 127          */
 128         if (!pll_enabled) {
 129                 release_cl_override = IS_CHERRYVIEW(dev_priv) &&
 130                         !chv_phy_powergate_ch(dev_priv, phy, ch, true);
 131
 132                 if (vlv_force_pll_on(dev_priv, pipe, vlv_get_dpll(dev_priv))) {
 133                         drm_err(&dev_priv->drm,
 134                                 "Failed to force on PLL for pipe %c!\n",
 135                                 pipe_name(pipe));
 136                         return;
 137                 }
 138         }
 139
 140         /*
 141          * Similar magic as in intel_dp_enable_port().
 142          * We _must_ do this port enable + disable trick
 143          * to make this power sequencer lock onto the port.
 144          * Otherwise even VDD force bit won't work.
 145          */
 146         intel_de_write(dev_priv, intel_dp->output_reg, DP);
 147         intel_de_posting_read(dev_priv, intel_dp->output_reg);
 148
 149         intel_de_write(dev_priv, intel_dp->output_reg, DP | DP_PORT_EN);
 150         intel_de_posting_read(dev_priv, intel_dp->output_reg);
 151
 152         intel_de_write(dev_priv, intel_dp->output_reg, DP & ~DP_PORT_EN);
 153         intel_de_posting_read(dev_priv, intel_dp->output_reg);
 154
 155         if (!pll_enabled) {
 156                 vlv_force_pll_off(dev_priv, pipe);
 157
 158                 if (release_cl_override)
 159                         chv_phy_powergate_ch(dev_priv, phy, ch, false);
 160         }
 161 }
 162
 163 static enum pipe vlv_find_free_pps(struct drm_i915_private *dev_priv)
 164 {
 165         struct intel_encoder *encoder;
 166         unsigned int pipes = (1 << PIPE_A) | (1 << PIPE_B);
 167
 168         /*
 169          * We don't have power sequencer currently.
 170          * Pick one that's not used by other ports.
 171          */
 172         for_each_intel_dp(&dev_priv->drm, encoder) {
 173                 struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
 174
 175                 if (encoder->type == INTEL_OUTPUT_EDP) {
 176                         drm_WARN_ON(&dev_priv->drm,
 177                                     intel_dp->pps.active_pipe != INVALID_PIPE &&
 178                                     intel_dp->pps.active_pipe !=
 179                                     intel_dp->pps.pps_pipe);
 180
 181                         if (intel_dp->pps.pps_pipe != INVALID_PIPE)
 182                                 pipes &= ~(1 << intel_dp->pps.pps_pipe);
 183                 } else {
 184                         drm_WARN_ON(&dev_priv->drm,
 185                                     intel_dp->pps.pps_pipe != INVALID_PIPE);
 186
 187                         if (intel_dp->pps.active_pipe != INVALID_PIPE)
 188                                 pipes &= ~(1 << intel_dp->pps.active_pipe);
 189                 }
 190         }
 191
 192         if (pipes == 0)
 193                 return INVALID_PIPE;
 194
 195         return ffs(pipes) - 1;
 196 }
 197
 198 static enum pipe
 199 vlv_power_sequencer_pipe(struct intel_dp *intel_dp)
 200 {
 201         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 202         struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 203         enum pipe pipe;
 204
 205         lockdep_assert_held(&dev_priv->display.pps.mutex);
 206
 207         /* We should never land here with regular DP ports */
 208         drm_WARN_ON(&dev_priv->drm, !intel_dp_is_edp(intel_dp));
 209
 210         drm_WARN_ON(&dev_priv->drm, intel_dp->pps.active_pipe != INVALID_PIPE &&
 211                     intel_dp->pps.active_pipe != intel_dp->pps.pps_pipe);
 212
 213         if (intel_dp->pps.pps_pipe != INVALID_PIPE)
 214                 return intel_dp->pps.pps_pipe;
 215
 216         pipe = vlv_find_free_pps(dev_priv);
 217
 218         /*
 219          * Didn't find one. This should not happen since there
 220          * are two power sequencers and up to two eDP ports.
 221          */
 222         if (drm_WARN_ON(&dev_priv->drm, pipe == INVALID_PIPE))
 223                 pipe = PIPE_A;
 224
 225         vlv_steal_power_sequencer(dev_priv, pipe);
 226         intel_dp->pps.pps_pipe = pipe;
 227
 228         drm_dbg_kms(&dev_priv->drm,
 229                     "picked %s for [ENCODER:%d:%s]\n",
 230                     pps_name(dev_priv, &intel_dp->pps),
 231                     dig_port->base.base.base.id, dig_port->base.base.name);
 232
 233         /* init power sequencer on this pipe and port */
 234         pps_init_delays(intel_dp);
 235         pps_init_registers(intel_dp, true);
 236
 237         /*
 238          * Even vdd force doesn't work until we've made
 239          * the power sequencer lock in on the port.
 240          */
 241         vlv_power_sequencer_kick(intel_dp);
 242
 243         return intel_dp->pps.pps_pipe;
 244 }
 245
 246 static int
 247 bxt_power_sequencer_idx(struct intel_dp *intel_dp)
 248 {
 249         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 250         int pps_idx = intel_dp->pps.pps_idx;
 251
 252         lockdep_assert_held(&dev_priv->display.pps.mutex);
 253
 254         /* We should never land here with regular DP ports */
 255         drm_WARN_ON(&dev_priv->drm, !intel_dp_is_edp(intel_dp));
 256
 257         if (!intel_dp->pps.pps_reset)
 258                 return pps_idx;
 259
 260         intel_dp->pps.pps_reset = false;
 261
 262         /*
 263          * Only the HW needs to be reprogrammed, the SW state is fixed and
 264          * has been setup during connector init.
 265          */
 266         pps_init_registers(intel_dp, false);
 267
 268         return pps_idx;
 269 }
 270
 271 typedef bool (*pps_check)(struct drm_i915_private *dev_priv, int pps_idx);
 272
 273 static bool pps_has_pp_on(struct drm_i915_private *dev_priv, int pps_idx)
 274 {
 275         return intel_de_read(dev_priv, PP_STATUS(pps_idx)) & PP_ON;
 276 }
 277
 278 static bool pps_has_vdd_on(struct drm_i915_private *dev_priv, int pps_idx)
 279 {
 280         return intel_de_read(dev_priv, PP_CONTROL(pps_idx)) & EDP_FORCE_VDD;
 281 }
 282
 283 static bool pps_any(struct drm_i915_private *dev_priv, int pps_idx)
 284 {
 285         return true;
 286 }
 287
 288 static enum pipe
 289 vlv_initial_pps_pipe(struct drm_i915_private *dev_priv,
 290                      enum port port, pps_check check)
 291 {
 292         enum pipe pipe;
 293
 294         for (pipe = PIPE_A; pipe <= PIPE_B; pipe++) {
 295                 u32 port_sel = intel_de_read(dev_priv, PP_ON_DELAYS(pipe)) &
 296                         PANEL_PORT_SELECT_MASK;
 297
 298                 if (port_sel != PANEL_PORT_SELECT_VLV(port))
 299                         continue;
 300
 301                 if (!check(dev_priv, pipe))
 302                         continue;
 303
 304                 return pipe;
 305         }
 306
 307         return INVALID_PIPE;
 308 }
 309
 310 static void
 311 vlv_initial_power_sequencer_setup(struct intel_dp *intel_dp)
 312 {
 313         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 314         struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 315         enum port port = dig_port->base.port;
 316
 317         lockdep_assert_held(&dev_priv->display.pps.mutex);
 318
 319         /* try to find a pipe with this port selected */
 320         /* first pick one where the panel is on */
 321         intel_dp->pps.pps_pipe = vlv_initial_pps_pipe(dev_priv, port,
 322                                                       pps_has_pp_on);
 323         /* didn't find one? pick one where vdd is on */
 324         if (intel_dp->pps.pps_pipe == INVALID_PIPE)
 325                 intel_dp->pps.pps_pipe = vlv_initial_pps_pipe(dev_priv, port,
 326                                                               pps_has_vdd_on);
 327         /* didn't find one? pick one with just the correct port */
 328         if (intel_dp->pps.pps_pipe == INVALID_PIPE)
 329                 intel_dp->pps.pps_pipe = vlv_initial_pps_pipe(dev_priv, port,
 330                                                               pps_any);
 331
 332         /* didn't find one? just let vlv_power_sequencer_pipe() pick one when needed */
 333         if (intel_dp->pps.pps_pipe == INVALID_PIPE) {
 334                 drm_dbg_kms(&dev_priv->drm,
 335                             "[ENCODER:%d:%s] no initial power sequencer\n",
 336                             dig_port->base.base.base.id, dig_port->base.base.name);
 337                 return;
 338         }
 339
 340         drm_dbg_kms(&dev_priv->drm,
 341                     "[ENCODER:%d:%s] initial power sequencer: %s\n",
 342                     dig_port->base.base.base.id, dig_port->base.base.name,
 343                     pps_name(dev_priv, &intel_dp->pps));
 344 }
 345
 346 static int intel_num_pps(struct drm_i915_private *i915)
 347 {
 348         if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915))
 349                 return 2;
 350
 351         if (IS_GEMINILAKE(i915) || IS_BROXTON(i915))
 352                 return 2;
 353
 354         if (INTEL_PCH_TYPE(i915) >= PCH_DG1)
 355                 return 1;
 356
 357         if (INTEL_PCH_TYPE(i915) >= PCH_ICP)
 358                 return 2;
 359
 360         return 1;
 361 }
 362
 363 static bool intel_pps_is_valid(struct intel_dp *intel_dp)
 364 {
 365         struct drm_i915_private *i915 = dp_to_i915(intel_dp);
 366
 367         if (intel_dp->pps.pps_idx == 1 &&
 368             INTEL_PCH_TYPE(i915) >= PCH_ICP &&
 369             INTEL_PCH_TYPE(i915) < PCH_MTP)
 370                 return intel_de_read(i915, SOUTH_CHICKEN1) & ICP_SECOND_PPS_IO_SELECT;
 371
 372         return true;
 373 }
 374
 375 static int
 376 bxt_initial_pps_idx(struct drm_i915_private *i915, pps_check check)
 377 {
 378         int pps_idx, pps_num = intel_num_pps(i915);
 379
 380         for (pps_idx = 0; pps_idx < pps_num; pps_idx++) {
 381                 if (check(i915, pps_idx))
 382                         return pps_idx;
 383         }
 384
 385         return -1;
 386 }
 387
 388 static bool
 389 pps_initial_setup(struct intel_dp *intel_dp)
 390 {
 391         struct intel_encoder *encoder = &dp_to_dig_port(intel_dp)->base;
 392         struct intel_connector *connector = intel_dp->attached_connector;
 393         struct drm_i915_private *i915 = to_i915(encoder->base.dev);
 394
 395         lockdep_assert_held(&i915->display.pps.mutex);
 396
 397         if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915)) {
 398                 vlv_initial_power_sequencer_setup(intel_dp);
 399                 return true;
 400         }
 401
 402         /* first ask the VBT */
 403         if (intel_num_pps(i915) > 1)
 404                 intel_dp->pps.pps_idx = connector->panel.vbt.backlight.controller;
 405         else
 406                 intel_dp->pps.pps_idx = 0;
 407
 408         if (drm_WARN_ON(&i915->drm, intel_dp->pps.pps_idx >= intel_num_pps(i915)))
 409                 intel_dp->pps.pps_idx = -1;
 410
 411         /* VBT wasn't parsed yet? pick one where the panel is on */
 412         if (intel_dp->pps.pps_idx < 0)
 413                 intel_dp->pps.pps_idx = bxt_initial_pps_idx(i915, pps_has_pp_on);
 414         /* didn't find one? pick one where vdd is on */
 415         if (intel_dp->pps.pps_idx < 0)
 416                 intel_dp->pps.pps_idx = bxt_initial_pps_idx(i915, pps_has_vdd_on);
 417         /* didn't find one? pick any */
 418         if (intel_dp->pps.pps_idx < 0) {
 419                 intel_dp->pps.pps_idx = bxt_initial_pps_idx(i915, pps_any);
 420
 421                 drm_dbg_kms(&i915->drm,
 422                             "[ENCODER:%d:%s] no initial power sequencer, assuming %s\n",
 423                             encoder->base.base.id, encoder->base.name,
 424                             pps_name(i915, &intel_dp->pps));
 425         } else {
 426                 drm_dbg_kms(&i915->drm,
 427                             "[ENCODER:%d:%s] initial power sequencer: %s\n",
 428                             encoder->base.base.id, encoder->base.name,
 429                             pps_name(i915, &intel_dp->pps));
 430         }
 431
 432         return intel_pps_is_valid(intel_dp);
 433 }
 434
 435 void intel_pps_reset_all(struct drm_i915_private *dev_priv)
 436 {
 437         struct intel_encoder *encoder;
 438
 439         if (drm_WARN_ON(&dev_priv->drm, !IS_LP(dev_priv)))
 440                 return;
 441
 442         if (!HAS_DISPLAY(dev_priv))
 443                 return;
 444
 445         /*
 446          * We can't grab pps_mutex here due to deadlock with power_domain
 447          * mutex when power_domain functions are called while holding pps_mutex.
 448          * That also means that in order to use pps_pipe the code needs to
 449          * hold both a power domain reference and pps_mutex, and the power domain
 450          * reference get/put must be done while _not_ holding pps_mutex.
 451          * pps_{lock,unlock}() do these steps in the correct order, so one
 452          * should use them always.
 453          */
 454
 455         for_each_intel_dp(&dev_priv->drm, encoder) {
 456                 struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
 457
 458                 drm_WARN_ON(&dev_priv->drm,
 459                             intel_dp->pps.active_pipe != INVALID_PIPE);
 460
 461                 if (encoder->type != INTEL_OUTPUT_EDP)
 462                         continue;
 463
 464                 if (DISPLAY_VER(dev_priv) >= 9)
 465                         intel_dp->pps.pps_reset = true;
 466                 else
 467                         intel_dp->pps.pps_pipe = INVALID_PIPE;
 468         }
 469 }
 470
 471 struct pps_registers {
 472         i915_reg_t pp_ctrl;
 473         i915_reg_t pp_stat;
 474         i915_reg_t pp_on;
 475         i915_reg_t pp_off;
 476         i915_reg_t pp_div;
 477 };
 478
 479 static void intel_pps_get_registers(struct intel_dp *intel_dp,
 480                                     struct pps_registers *regs)
 481 {
 482         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 483         int pps_idx;
 484
 485         memset(regs, 0, sizeof(*regs));
 486
 487         if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
 488                 pps_idx = vlv_power_sequencer_pipe(intel_dp);
 489         else if (IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv))
 490                 pps_idx = bxt_power_sequencer_idx(intel_dp);
 491         else
 492                 pps_idx = intel_dp->pps.pps_idx;
 493
 494         regs->pp_ctrl = PP_CONTROL(pps_idx);
 495         regs->pp_stat = PP_STATUS(pps_idx);
 496         regs->pp_on = PP_ON_DELAYS(pps_idx);
 497         regs->pp_off = PP_OFF_DELAYS(pps_idx);
 498
 499         /* Cycle delay moved from PP_DIVISOR to PP_CONTROL */
 500         if (IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv) ||
 501             INTEL_PCH_TYPE(dev_priv) >= PCH_CNP)
 502                 regs->pp_div = INVALID_MMIO_REG;
 503         else
 504                 regs->pp_div = PP_DIVISOR(pps_idx);
 505 }
 506
 507 static i915_reg_t
 508 _pp_ctrl_reg(struct intel_dp *intel_dp)
 509 {
 510         struct pps_registers regs;
 511
 512         intel_pps_get_registers(intel_dp, &regs);
 513
 514         return regs.pp_ctrl;
 515 }
 516
 517 static i915_reg_t
 518 _pp_stat_reg(struct intel_dp *intel_dp)
 519 {
 520         struct pps_registers regs;
 521
 522         intel_pps_get_registers(intel_dp, &regs);
 523
 524         return regs.pp_stat;
 525 }
 526
 527 static bool edp_have_panel_power(struct intel_dp *intel_dp)
 528 {
 529         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 530
 531         lockdep_assert_held(&dev_priv->display.pps.mutex);
 532
 533         if ((IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) &&
 534             intel_dp->pps.pps_pipe == INVALID_PIPE)
 535                 return false;
 536
 537         return (intel_de_read(dev_priv, _pp_stat_reg(intel_dp)) & PP_ON) != 0;
 538 }
 539
 540 static bool edp_have_panel_vdd(struct intel_dp *intel_dp)
 541 {
 542         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 543
 544         lockdep_assert_held(&dev_priv->display.pps.mutex);
 545
 546         if ((IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) &&
 547             intel_dp->pps.pps_pipe == INVALID_PIPE)
 548                 return false;
 549
 550         return intel_de_read(dev_priv, _pp_ctrl_reg(intel_dp)) & EDP_FORCE_VDD;
 551 }
 552
 553 void intel_pps_check_power_unlocked(struct intel_dp *intel_dp)
 554 {
 555         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 556         struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 557
 558         if (!intel_dp_is_edp(intel_dp))
 559                 return;
 560
 561         if (!edp_have_panel_power(intel_dp) && !edp_have_panel_vdd(intel_dp)) {
 562                 drm_WARN(&dev_priv->drm, 1,
 563                          "[ENCODER:%d:%s] %s powered off while attempting AUX CH communication.\n",
 564                          dig_port->base.base.base.id, dig_port->base.base.name,
 565                          pps_name(dev_priv, &intel_dp->pps));
 566                 drm_dbg_kms(&dev_priv->drm,
 567                             "[ENCODER:%d:%s] %s PP_STATUS: 0x%08x PP_CONTROL: 0x%08x\n",
 568                             dig_port->base.base.base.id, dig_port->base.base.name,
 569                             pps_name(dev_priv, &intel_dp->pps),
 570                             intel_de_read(dev_priv, _pp_stat_reg(intel_dp)),
 571                             intel_de_read(dev_priv, _pp_ctrl_reg(intel_dp)));
 572         }
 573 }
 574
 575 #define IDLE_ON_MASK            (PP_ON | PP_SEQUENCE_MASK | 0                     | PP_SEQUENCE_STATE_MASK)
 576 #define IDLE_ON_VALUE           (PP_ON | PP_SEQUENCE_NONE | 0                     | PP_SEQUENCE_STATE_ON_IDLE)
 577
 578 #define IDLE_OFF_MASK           (PP_ON | PP_SEQUENCE_MASK | 0                     | 0)
 579 #define IDLE_OFF_VALUE          (0     | PP_SEQUENCE_NONE | 0                     | 0)
 580
 581 #define IDLE_CYCLE_MASK         (PP_ON | PP_SEQUENCE_MASK | PP_CYCLE_DELAY_ACTIVE | PP_SEQUENCE_STATE_MASK)
 582 #define IDLE_CYCLE_VALUE        (0     | PP_SEQUENCE_NONE | 0                     | PP_SEQUENCE_STATE_OFF_IDLE)
 583
 584 static void intel_pps_verify_state(struct intel_dp *intel_dp);
 585
 586 static void wait_panel_status(struct intel_dp *intel_dp,
 587                               u32 mask, u32 value)
 588 {
 589         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 590         struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 591         i915_reg_t pp_stat_reg, pp_ctrl_reg;
 592
 593         lockdep_assert_held(&dev_priv->display.pps.mutex);
 594
 595         intel_pps_verify_state(intel_dp);
 596
 597         pp_stat_reg = _pp_stat_reg(intel_dp);
 598         pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
 599
 600         drm_dbg_kms(&dev_priv->drm,
 601                     "[ENCODER:%d:%s] %s mask: 0x%08x value: 0x%08x PP_STATUS: 0x%08x PP_CONTROL: 0x%08x\n",
 602                     dig_port->base.base.base.id, dig_port->base.base.name,
 603                     pps_name(dev_priv, &intel_dp->pps),
 604                     mask, value,
 605                     intel_de_read(dev_priv, pp_stat_reg),
 606                     intel_de_read(dev_priv, pp_ctrl_reg));
 607
 608         if (intel_de_wait_for_register(dev_priv, pp_stat_reg,
 609                                        mask, value, 5000))
 610                 drm_err(&dev_priv->drm,
 611                         "[ENCODER:%d:%s] %s panel status timeout: PP_STATUS: 0x%08x PP_CONTROL: 0x%08x\n",
 612                         dig_port->base.base.base.id, dig_port->base.base.name,
 613                         pps_name(dev_priv, &intel_dp->pps),
 614                         intel_de_read(dev_priv, pp_stat_reg),
 615                         intel_de_read(dev_priv, pp_ctrl_reg));
 616
 617         drm_dbg_kms(&dev_priv->drm, "Wait complete\n");
 618 }
 619
 620 static void wait_panel_on(struct intel_dp *intel_dp)
 621 {
 622         struct drm_i915_private *i915 = dp_to_i915(intel_dp);
 623         struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 624
 625         drm_dbg_kms(&i915->drm, "[ENCODER:%d:%s] %s wait for panel power on\n",
 626                     dig_port->base.base.base.id, dig_port->base.base.name,
 627                     pps_name(i915, &intel_dp->pps));
 628         wait_panel_status(intel_dp, IDLE_ON_MASK, IDLE_ON_VALUE);
 629 }
 630
 631 static void wait_panel_off(struct intel_dp *intel_dp)
 632 {
 633         struct drm_i915_private *i915 = dp_to_i915(intel_dp);
 634         struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 635
 636         drm_dbg_kms(&i915->drm, "[ENCODER:%d:%s] %s wait for panel power off time\n",
 637                     dig_port->base.base.base.id, dig_port->base.base.name,
 638                     pps_name(i915, &intel_dp->pps));
 639         wait_panel_status(intel_dp, IDLE_OFF_MASK, IDLE_OFF_VALUE);
 640 }
 641
 642 static void wait_panel_power_cycle(struct intel_dp *intel_dp)
 643 {
 644         struct drm_i915_private *i915 = dp_to_i915(intel_dp);
 645         struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 646         ktime_t panel_power_on_time;
 647         s64 panel_power_off_duration;
 648
 649         drm_dbg_kms(&i915->drm, "[ENCODER:%d:%s] %s wait for panel power cycle\n",
 650                     dig_port->base.base.base.id, dig_port->base.base.name,
 651                     pps_name(i915, &intel_dp->pps));
 652
 653         /* take the difference of current time and panel power off time
 654          * and then make panel wait for t11_t12 if needed. */
 655         panel_power_on_time = ktime_get_boottime();
 656         panel_power_off_duration = ktime_ms_delta(panel_power_on_time, intel_dp->pps.panel_power_off_time);
 657
 658         /* When we disable the VDD override bit last we have to do the manual
 659          * wait. */
 660         if (panel_power_off_duration < (s64)intel_dp->pps.panel_power_cycle_delay)
 661                 wait_remaining_ms_from_jiffies(jiffies,
 662                                        intel_dp->pps.panel_power_cycle_delay - panel_power_off_duration);
 663
 664         wait_panel_status(intel_dp, IDLE_CYCLE_MASK, IDLE_CYCLE_VALUE);
 665 }
 666
 667 void intel_pps_wait_power_cycle(struct intel_dp *intel_dp)
 668 {
 669         intel_wakeref_t wakeref;
 670
 671         if (!intel_dp_is_edp(intel_dp))
 672                 return;
 673
 674         with_intel_pps_lock(intel_dp, wakeref)
 675                 wait_panel_power_cycle(intel_dp);
 676 }
 677
 678 static void wait_backlight_on(struct intel_dp *intel_dp)
 679 {
 680         wait_remaining_ms_from_jiffies(intel_dp->pps.last_power_on,
 681                                        intel_dp->pps.backlight_on_delay);
 682 }
 683
 684 static void edp_wait_backlight_off(struct intel_dp *intel_dp)
 685 {
 686         wait_remaining_ms_from_jiffies(intel_dp->pps.last_backlight_off,
 687                                        intel_dp->pps.backlight_off_delay);
 688 }
 689
 690 /* Read the current pp_control value, unlocking the register if it
 691  * is locked
 692  */
 693
 694 static  u32 ilk_get_pp_control(struct intel_dp *intel_dp)
 695 {
 696         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 697         u32 control;
 698
 699         lockdep_assert_held(&dev_priv->display.pps.mutex);
 700
 701         control = intel_de_read(dev_priv, _pp_ctrl_reg(intel_dp));
 702         if (drm_WARN_ON(&dev_priv->drm, !HAS_DDI(dev_priv) &&
 703                         (control & PANEL_UNLOCK_MASK) != PANEL_UNLOCK_REGS)) {
 704                 control &= ~PANEL_UNLOCK_MASK;
 705                 control |= PANEL_UNLOCK_REGS;
 706         }
 707         return control;
 708 }
 709
 710 /*
 711  * Must be paired with intel_pps_vdd_off_unlocked().
 712  * Must hold pps_mutex around the whole on/off sequence.
 713  * Can be nested with intel_pps_vdd_{on,off}() calls.
 714  */
 715 bool intel_pps_vdd_on_unlocked(struct intel_dp *intel_dp)
 716 {
 717         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 718         struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 719         u32 pp;
 720         i915_reg_t pp_stat_reg, pp_ctrl_reg;
 721         bool need_to_disable = !intel_dp->pps.want_panel_vdd;
 722
 723         lockdep_assert_held(&dev_priv->display.pps.mutex);
 724
 725         if (!intel_dp_is_edp(intel_dp))
 726                 return false;
 727
 728         cancel_delayed_work(&intel_dp->pps.panel_vdd_work);
 729         intel_dp->pps.want_panel_vdd = true;
 730
 731         if (edp_have_panel_vdd(intel_dp))
 732                 return need_to_disable;
 733
 734         drm_WARN_ON(&dev_priv->drm, intel_dp->pps.vdd_wakeref);
 735         intel_dp->pps.vdd_wakeref = intel_display_power_get(dev_priv,
 736                                                             intel_aux_power_domain(dig_port));
 737
 738         pp_stat_reg = _pp_stat_reg(intel_dp);
 739         pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
 740
 741         drm_dbg_kms(&dev_priv->drm, "[ENCODER:%d:%s] %s turning VDD on\n",
 742                     dig_port->base.base.base.id, dig_port->base.base.name,
 743                     pps_name(dev_priv, &intel_dp->pps));
 744
 745         if (!edp_have_panel_power(intel_dp))
 746                 wait_panel_power_cycle(intel_dp);
 747
 748         pp = ilk_get_pp_control(intel_dp);
 749         pp |= EDP_FORCE_VDD;
 750
 751         intel_de_write(dev_priv, pp_ctrl_reg, pp);
 752         intel_de_posting_read(dev_priv, pp_ctrl_reg);
 753         drm_dbg_kms(&dev_priv->drm, "[ENCODER:%d:%s] %s PP_STATUS: 0x%08x PP_CONTROL: 0x%08x\n",
 754                     dig_port->base.base.base.id, dig_port->base.base.name,
 755                     pps_name(dev_priv, &intel_dp->pps),
 756                     intel_de_read(dev_priv, pp_stat_reg),
 757                     intel_de_read(dev_priv, pp_ctrl_reg));
 758         /*
 759          * If the panel wasn't on, delay before accessing aux channel
 760          */
 761         if (!edp_have_panel_power(intel_dp)) {
 762                 drm_dbg_kms(&dev_priv->drm,
 763                             "[ENCODER:%d:%s] %s panel power wasn't enabled\n",
 764                             dig_port->base.base.base.id, dig_port->base.base.name,
 765                             pps_name(dev_priv, &intel_dp->pps));
 766                 msleep(intel_dp->pps.panel_power_up_delay);
 767         }
 768
 769         return need_to_disable;
 770 }
 771
 772 /*
 773  * Must be paired with intel_pps_off().
 774  * Nested calls to these functions are not allowed since
 775  * we drop the lock. Caller must use some higher level
 776  * locking to prevent nested calls from other threads.
 777  */
 778 void intel_pps_vdd_on(struct intel_dp *intel_dp)
 779 {
 780         struct drm_i915_private *i915 = dp_to_i915(intel_dp);
 781         intel_wakeref_t wakeref;
 782         bool vdd;
 783
 784         if (!intel_dp_is_edp(intel_dp))
 785                 return;
 786
 787         vdd = false;
 788         with_intel_pps_lock(intel_dp, wakeref)
 789                 vdd = intel_pps_vdd_on_unlocked(intel_dp);
 790         I915_STATE_WARN(!vdd, "[ENCODER:%d:%s] %s VDD already requested on\n",
 791                         dp_to_dig_port(intel_dp)->base.base.base.id,
 792                         dp_to_dig_port(intel_dp)->base.base.name,
 793                         pps_name(i915, &intel_dp->pps));
 794 }
 795
 796 static void intel_pps_vdd_off_sync_unlocked(struct intel_dp *intel_dp)
 797 {
 798         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 799         struct intel_digital_port *dig_port =
 800                 dp_to_dig_port(intel_dp);
 801         u32 pp;
 802         i915_reg_t pp_stat_reg, pp_ctrl_reg;
 803
 804         lockdep_assert_held(&dev_priv->display.pps.mutex);
 805
 806         drm_WARN_ON(&dev_priv->drm, intel_dp->pps.want_panel_vdd);
 807
 808         if (!edp_have_panel_vdd(intel_dp))
 809                 return;
 810
 811         drm_dbg_kms(&dev_priv->drm, "[ENCODER:%d:%s] %s turning VDD off\n",
 812                     dig_port->base.base.base.id, dig_port->base.base.name,
 813                     pps_name(dev_priv, &intel_dp->pps));
 814
 815         pp = ilk_get_pp_control(intel_dp);
 816         pp &= ~EDP_FORCE_VDD;
 817
 818         pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
 819         pp_stat_reg = _pp_stat_reg(intel_dp);
 820
 821         intel_de_write(dev_priv, pp_ctrl_reg, pp);
 822         intel_de_posting_read(dev_priv, pp_ctrl_reg);
 823
 824         /* Make sure sequencer is idle before allowing subsequent activity */
 825         drm_dbg_kms(&dev_priv->drm, "[ENCODER:%d:%s] %s PP_STATUS: 0x%08x PP_CONTROL: 0x%08x\n",
 826                     dig_port->base.base.base.id, dig_port->base.base.name,
 827                     pps_name(dev_priv, &intel_dp->pps),
 828                     intel_de_read(dev_priv, pp_stat_reg),
 829                     intel_de_read(dev_priv, pp_ctrl_reg));
 830
 831         if ((pp & PANEL_POWER_ON) == 0)
 832                 intel_dp->pps.panel_power_off_time = ktime_get_boottime();
 833
 834         intel_display_power_put(dev_priv,
 835                                 intel_aux_power_domain(dig_port),
 836                                 fetch_and_zero(&intel_dp->pps.vdd_wakeref));
 837 }
 838
 839 void intel_pps_vdd_off_sync(struct intel_dp *intel_dp)
 840 {
 841         intel_wakeref_t wakeref;
 842
 843         if (!intel_dp_is_edp(intel_dp))
 844                 return;
 845
 846         cancel_delayed_work_sync(&intel_dp->pps.panel_vdd_work);
 847         /*
 848          * vdd might still be enabled due to the delayed vdd off.
 849          * Make sure vdd is actually turned off here.
 850          */
 851         with_intel_pps_lock(intel_dp, wakeref)
 852                 intel_pps_vdd_off_sync_unlocked(intel_dp);
 853 }
 854
 855 static void edp_panel_vdd_work(struct work_struct *__work)
 856 {
 857         struct intel_pps *pps = container_of(to_delayed_work(__work),
 858                                              struct intel_pps, panel_vdd_work);
 859         struct intel_dp *intel_dp = container_of(pps, struct intel_dp, pps);
 860         intel_wakeref_t wakeref;
 861
 862         with_intel_pps_lock(intel_dp, wakeref) {
 863                 if (!intel_dp->pps.want_panel_vdd)
 864                         intel_pps_vdd_off_sync_unlocked(intel_dp);
 865         }
 866 }
 867
 868 static void edp_panel_vdd_schedule_off(struct intel_dp *intel_dp)
 869 {
 870         unsigned long delay;
 871
 872         /*
 873          * We may not yet know the real power sequencing delays,
 874          * so keep VDD enabled until we're done with init.
 875          */
 876         if (intel_dp->pps.initializing)
 877                 return;
 878
 879         /*
 880          * Queue the timer to fire a long time from now (relative to the power
 881          * down delay) to keep the panel power up across a sequence of
 882          * operations.
 883          */
 884         delay = msecs_to_jiffies(intel_dp->pps.panel_power_cycle_delay * 5);
 885         schedule_delayed_work(&intel_dp->pps.panel_vdd_work, delay);
 886 }
 887
 888 /*
 889  * Must be paired with edp_panel_vdd_on().
 890  * Must hold pps_mutex around the whole on/off sequence.
 891  * Can be nested with intel_pps_vdd_{on,off}() calls.
 892  */
 893 void intel_pps_vdd_off_unlocked(struct intel_dp *intel_dp, bool sync)
 894 {
 895         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 896
 897         lockdep_assert_held(&dev_priv->display.pps.mutex);
 898
 899         if (!intel_dp_is_edp(intel_dp))
 900                 return;
 901
 902         I915_STATE_WARN(!intel_dp->pps.want_panel_vdd, "[ENCODER:%d:%s] %s VDD not forced on",
 903                         dp_to_dig_port(intel_dp)->base.base.base.id,
 904                         dp_to_dig_port(intel_dp)->base.base.name,
 905                         pps_name(dev_priv, &intel_dp->pps));
 906
 907         intel_dp->pps.want_panel_vdd = false;
 908
 909         if (sync)
 910                 intel_pps_vdd_off_sync_unlocked(intel_dp);
 911         else
 912                 edp_panel_vdd_schedule_off(intel_dp);
 913 }
 914
 915 void intel_pps_on_unlocked(struct intel_dp *intel_dp)
 916 {
 917         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 918         u32 pp;
 919         i915_reg_t pp_ctrl_reg;
 920
 921         lockdep_assert_held(&dev_priv->display.pps.mutex);
 922
 923         if (!intel_dp_is_edp(intel_dp))
 924                 return;
 925
 926         drm_dbg_kms(&dev_priv->drm, "[ENCODER:%d:%s] %s turn panel power on\n",
 927                     dp_to_dig_port(intel_dp)->base.base.base.id,
 928                     dp_to_dig_port(intel_dp)->base.base.name,
 929                     pps_name(dev_priv, &intel_dp->pps));
 930
 931         if (drm_WARN(&dev_priv->drm, edp_have_panel_power(intel_dp),
 932                      "[ENCODER:%d:%s] %s panel power already on\n",
 933                      dp_to_dig_port(intel_dp)->base.base.base.id,
 934                      dp_to_dig_port(intel_dp)->base.base.name,
 935                      pps_name(dev_priv, &intel_dp->pps)))
 936                 return;
 937
 938         wait_panel_power_cycle(intel_dp);
 939
 940         pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
 941         pp = ilk_get_pp_control(intel_dp);
 942         if (IS_IRONLAKE(dev_priv)) {
 943                 /* ILK workaround: disable reset around power sequence */
 944                 pp &= ~PANEL_POWER_RESET;
 945                 intel_de_write(dev_priv, pp_ctrl_reg, pp);
 946                 intel_de_posting_read(dev_priv, pp_ctrl_reg);
 947         }
 948
 949         pp |= PANEL_POWER_ON;
 950         if (!IS_IRONLAKE(dev_priv))
 951                 pp |= PANEL_POWER_RESET;
 952
 953         intel_de_write(dev_priv, pp_ctrl_reg, pp);
 954         intel_de_posting_read(dev_priv, pp_ctrl_reg);
 955
 956         wait_panel_on(intel_dp);
 957         intel_dp->pps.last_power_on = jiffies;
 958
 959         if (IS_IRONLAKE(dev_priv)) {
 960                 pp |= PANEL_POWER_RESET; /* restore panel reset bit */
 961                 intel_de_write(dev_priv, pp_ctrl_reg, pp);
 962                 intel_de_posting_read(dev_priv, pp_ctrl_reg);
 963         }
 964 }
 965
 966 void intel_pps_on(struct intel_dp *intel_dp)
 967 {
 968         intel_wakeref_t wakeref;
 969
 970         if (!intel_dp_is_edp(intel_dp))
 971                 return;
 972
 973         with_intel_pps_lock(intel_dp, wakeref)
 974                 intel_pps_on_unlocked(intel_dp);
 975 }
 976
 977 void intel_pps_off_unlocked(struct intel_dp *intel_dp)
 978 {
 979         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 980         struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 981         u32 pp;
 982         i915_reg_t pp_ctrl_reg;
 983
 984         lockdep_assert_held(&dev_priv->display.pps.mutex);
 985
 986         if (!intel_dp_is_edp(intel_dp))
 987                 return;
 988
 989         drm_dbg_kms(&dev_priv->drm, "[ENCODER:%d:%s] %s turn panel power off\n",
 990                     dig_port->base.base.base.id, dig_port->base.base.name,
 991                     pps_name(dev_priv, &intel_dp->pps));
 992
 993         drm_WARN(&dev_priv->drm, !intel_dp->pps.want_panel_vdd,
 994                  "[ENCODER:%d:%s] %s need VDD to turn off panel\n",
 995                  dig_port->base.base.base.id, dig_port->base.base.name,
 996                  pps_name(dev_priv, &intel_dp->pps));
 997
 998         pp = ilk_get_pp_control(intel_dp);
 999         /* We need to switch off panel power _and_ force vdd, for otherwise some
1000          * panels get very unhappy and cease to work. */
1001         pp &= ~(PANEL_POWER_ON | PANEL_POWER_RESET | EDP_FORCE_VDD |
1002                 EDP_BLC_ENABLE);
1003
1004         pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
1005
1006         intel_dp->pps.want_panel_vdd = false;
1007
1008         intel_de_write(dev_priv, pp_ctrl_reg, pp);
1009         intel_de_posting_read(dev_priv, pp_ctrl_reg);
1010
1011         wait_panel_off(intel_dp);
1012         intel_dp->pps.panel_power_off_time = ktime_get_boottime();
1013
1014         /* We got a reference when we enabled the VDD. */
1015         intel_display_power_put(dev_priv,
1016                                 intel_aux_power_domain(dig_port),
1017                                 fetch_and_zero(&intel_dp->pps.vdd_wakeref));
1018 }
1019
1020 void intel_pps_off(struct intel_dp *intel_dp)
1021 {
1022         intel_wakeref_t wakeref;
1023
1024         if (!intel_dp_is_edp(intel_dp))
1025                 return;
1026
1027         with_intel_pps_lock(intel_dp, wakeref)
1028                 intel_pps_off_unlocked(intel_dp);
1029 }
1030
1031 /* Enable backlight in the panel power control. */
1032 void intel_pps_backlight_on(struct intel_dp *intel_dp)
1033 {
1034         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
1035         intel_wakeref_t wakeref;
1036
1037         /*
1038          * If we enable the backlight right away following a panel power
1039          * on, we may see slight flicker as the panel syncs with the eDP
1040          * link.  So delay a bit to make sure the image is solid before
1041          * allowing it to appear.
1042          */
1043         wait_backlight_on(intel_dp);
1044
1045         with_intel_pps_lock(intel_dp, wakeref) {
1046                 i915_reg_t pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
1047                 u32 pp;
1048
1049                 pp = ilk_get_pp_control(intel_dp);
1050                 pp |= EDP_BLC_ENABLE;
1051
1052                 intel_de_write(dev_priv, pp_ctrl_reg, pp);
1053                 intel_de_posting_read(dev_priv, pp_ctrl_reg);
1054         }
1055 }
1056
1057 /* Disable backlight in the panel power control. */
1058 void intel_pps_backlight_off(struct intel_dp *intel_dp)
1059 {
1060         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
1061         intel_wakeref_t wakeref;
1062
1063         if (!intel_dp_is_edp(intel_dp))
1064                 return;
1065
1066         with_intel_pps_lock(intel_dp, wakeref) {
1067                 i915_reg_t pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
1068                 u32 pp;
1069
1070                 pp = ilk_get_pp_control(intel_dp);
1071                 pp &= ~EDP_BLC_ENABLE;
1072
1073                 intel_de_write(dev_priv, pp_ctrl_reg, pp);
1074                 intel_de_posting_read(dev_priv, pp_ctrl_reg);
1075         }
1076
1077         intel_dp->pps.last_backlight_off = jiffies;
1078         edp_wait_backlight_off(intel_dp);
1079 }
1080
1081 /*
1082  * Hook for controlling the panel power control backlight through the bl_power
1083  * sysfs attribute. Take care to handle multiple calls.
1084  */
1085 void intel_pps_backlight_power(struct intel_connector *connector, bool enable)
1086 {
1087         struct drm_i915_private *i915 = to_i915(connector->base.dev);
1088         struct intel_dp *intel_dp = intel_attached_dp(connector);
1089         intel_wakeref_t wakeref;
1090         bool is_enabled;
1091
1092         is_enabled = false;
1093         with_intel_pps_lock(intel_dp, wakeref)
1094                 is_enabled = ilk_get_pp_control(intel_dp) & EDP_BLC_ENABLE;
1095         if (is_enabled == enable)
1096                 return;
1097
1098         drm_dbg_kms(&i915->drm, "panel power control backlight %s\n",
1099                     enable ? "enable" : "disable");
1100
1101         if (enable)
1102                 intel_pps_backlight_on(intel_dp);
1103         else
1104                 intel_pps_backlight_off(intel_dp);
1105 }
1106
1107 static void vlv_detach_power_sequencer(struct intel_dp *intel_dp)
1108 {
1109         struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
1110         struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
1111         enum pipe pipe = intel_dp->pps.pps_pipe;
1112         i915_reg_t pp_on_reg = PP_ON_DELAYS(pipe);
1113
1114         drm_WARN_ON(&dev_priv->drm, intel_dp->pps.active_pipe != INVALID_PIPE);
1115
1116         if (drm_WARN_ON(&dev_priv->drm, pipe != PIPE_A && pipe != PIPE_B))
1117                 return;
1118
1119         intel_pps_vdd_off_sync_unlocked(intel_dp);
1120
1121         /*
1122          * VLV seems to get confused when multiple power sequencers
1123          * have the same port selected (even if only one has power/vdd
1124          * enabled). The failure manifests as vlv_wait_port_ready() failing
1125          * CHV on the other hand doesn't seem to mind having the same port
1126          * selected in multiple power sequencers, but let's clear the
1127          * port select always when logically disconnecting a power sequencer
1128          * from a port.
1129          */
1130         drm_dbg_kms(&dev_priv->drm,
1131                     "detaching %s from [ENCODER:%d:%s]\n",
1132                     pps_name(dev_priv, &intel_dp->pps),
1133                     dig_port->base.base.base.id, dig_port->base.base.name);
1134         intel_de_write(dev_priv, pp_on_reg, 0);
1135         intel_de_posting_read(dev_priv, pp_on_reg);
1136
1137         intel_dp->pps.pps_pipe = INVALID_PIPE;
1138 }
1139
1140 static void vlv_steal_power_sequencer(struct drm_i915_private *dev_priv,
1141                                       enum pipe pipe)
1142 {
1143         struct intel_encoder *encoder;
1144
1145         lockdep_assert_held(&dev_priv->display.pps.mutex);
1146
1147         for_each_intel_dp(&dev_priv->drm, encoder) {
1148                 struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
1149
1150                 drm_WARN(&dev_priv->drm, intel_dp->pps.active_pipe == pipe,
1151                          "stealing PPS %c from active [ENCODER:%d:%s]\n",
1152                          pipe_name(pipe), encoder->base.base.id,
1153                          encoder->base.name);
1154
1155                 if (intel_dp->pps.pps_pipe != pipe)
1156                         continue;
1157
1158                 drm_dbg_kms(&dev_priv->drm,
1159                             "stealing PPS %c from [ENCODER:%d:%s]\n",
1160                             pipe_name(pipe), encoder->base.base.id,
1161                             encoder->base.name);
1162
1163                 /* make sure vdd is off before we steal it */
1164                 vlv_detach_power_sequencer(intel_dp);
1165         }
1166 }
1167
1168 void vlv_pps_init(struct intel_encoder *encoder,
1169                   const struct intel_crtc_state *crtc_state)
1170 {
1171         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
1172         struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
1173         struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
1174
1175         lockdep_assert_held(&dev_priv->display.pps.mutex);
1176
1177         drm_WARN_ON(&dev_priv->drm, intel_dp->pps.active_pipe != INVALID_PIPE);
1178
1179         if (intel_dp->pps.pps_pipe != INVALID_PIPE &&
1180             intel_dp->pps.pps_pipe != crtc->pipe) {
1181                 /*
1182                  * If another power sequencer was being used on this
1183                  * port previously make sure to turn off vdd there while
1184                  * we still have control of it.
1185                  */
1186                 vlv_detach_power_sequencer(intel_dp);
1187         }
1188
1189         /*
1190          * We may be stealing the power
1191          * sequencer from another port.
1192          */
1193         vlv_steal_power_sequencer(dev_priv, crtc->pipe);
1194
1195         intel_dp->pps.active_pipe = crtc->pipe;
1196
1197         if (!intel_dp_is_edp(intel_dp))
1198                 return;
1199
1200         /* now it's all ours */
1201         intel_dp->pps.pps_pipe = crtc->pipe;
1202
1203         drm_dbg_kms(&dev_priv->drm,
1204                     "initializing %s for [ENCODER:%d:%s]\n",
1205                     pps_name(dev_priv, &intel_dp->pps),
1206                     encoder->base.base.id, encoder->base.name);
1207
1208         /* init power sequencer on this pipe and port */
1209         pps_init_delays(intel_dp);
1210         pps_init_registers(intel_dp, true);
1211 }
1212
1213 static void pps_vdd_init(struct intel_dp *intel_dp)
1214 {
1215         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
1216         struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
1217
1218         lockdep_assert_held(&dev_priv->display.pps.mutex);
1219
1220         if (!edp_have_panel_vdd(intel_dp))
1221                 return;
1222
1223         /*
1224          * The VDD bit needs a power domain reference, so if the bit is
1225          * already enabled when we boot or resume, grab this reference and
1226          * schedule a vdd off, so we don't hold on to the reference
1227          * indefinitely.
1228          */
1229         drm_dbg_kms(&dev_priv->drm,
1230                     "[ENCODER:%d:%s] %s VDD left on by BIOS, adjusting state tracking\n",
1231                     dig_port->base.base.base.id, dig_port->base.base.name,
1232                     pps_name(dev_priv, &intel_dp->pps));
1233         drm_WARN_ON(&dev_priv->drm, intel_dp->pps.vdd_wakeref);
1234         intel_dp->pps.vdd_wakeref = intel_display_power_get(dev_priv,
1235                                                             intel_aux_power_domain(dig_port));
1236 }
1237
1238 bool intel_pps_have_panel_power_or_vdd(struct intel_dp *intel_dp)
1239 {
1240         intel_wakeref_t wakeref;
1241         bool have_power = false;
1242
1243         with_intel_pps_lock(intel_dp, wakeref) {
1244                 have_power = edp_have_panel_power(intel_dp) ||
1245                              edp_have_panel_vdd(intel_dp);
1246         }
1247
1248         return have_power;
1249 }
1250
1251 static void pps_init_timestamps(struct intel_dp *intel_dp)
1252 {
1253         /*
1254          * Initialize panel power off time to 0, assuming panel power could have
1255          * been toggled between kernel boot and now only by a previously loaded
1256          * and removed i915, which has already ensured sufficient power off
1257          * delay at module remove.
1258          */
1259         intel_dp->pps.panel_power_off_time = 0;
1260         intel_dp->pps.last_power_on = jiffies;
1261         intel_dp->pps.last_backlight_off = jiffies;
1262 }
1263
1264 static void
1265 intel_pps_readout_hw_state(struct intel_dp *intel_dp, struct edp_power_seq *seq)
1266 {
1267         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
1268         u32 pp_on, pp_off, pp_ctl;
1269         struct pps_registers regs;
1270
1271         intel_pps_get_registers(intel_dp, &regs);
1272
1273         pp_ctl = ilk_get_pp_control(intel_dp);
1274
1275         /* Ensure PPS is unlocked */
1276         if (!HAS_DDI(dev_priv))
1277                 intel_de_write(dev_priv, regs.pp_ctrl, pp_ctl);
1278
1279         pp_on = intel_de_read(dev_priv, regs.pp_on);
1280         pp_off = intel_de_read(dev_priv, regs.pp_off);
1281
1282         /* Pull timing values out of registers */
1283         seq->t1_t3 = REG_FIELD_GET(PANEL_POWER_UP_DELAY_MASK, pp_on);
1284         seq->t8 = REG_FIELD_GET(PANEL_LIGHT_ON_DELAY_MASK, pp_on);
1285         seq->t9 = REG_FIELD_GET(PANEL_LIGHT_OFF_DELAY_MASK, pp_off);
1286         seq->t10 = REG_FIELD_GET(PANEL_POWER_DOWN_DELAY_MASK, pp_off);
1287
1288         if (i915_mmio_reg_valid(regs.pp_div)) {
1289                 u32 pp_div;
1290
1291                 pp_div = intel_de_read(dev_priv, regs.pp_div);
1292
1293                 seq->t11_t12 = REG_FIELD_GET(PANEL_POWER_CYCLE_DELAY_MASK, pp_div) * 1000;
1294         } else {
1295                 seq->t11_t12 = REG_FIELD_GET(BXT_POWER_CYCLE_DELAY_MASK, pp_ctl) * 1000;
1296         }
1297 }
1298
1299 static void
1300 intel_pps_dump_state(struct intel_dp *intel_dp, const char *state_name,
1301                      const struct edp_power_seq *seq)
1302 {
1303         struct drm_i915_private *i915 = dp_to_i915(intel_dp);
1304
1305         drm_dbg_kms(&i915->drm, "%s t1_t3 %d t8 %d t9 %d t10 %d t11_t12 %d\n",
1306                     state_name,
1307                     seq->t1_t3, seq->t8, seq->t9, seq->t10, seq->t11_t12);
1308 }
1309
1310 static void
1311 intel_pps_verify_state(struct intel_dp *intel_dp)
1312 {
1313         struct drm_i915_private *i915 = dp_to_i915(intel_dp);
1314         struct edp_power_seq hw;
1315         struct edp_power_seq *sw = &intel_dp->pps.pps_delays;
1316
1317         intel_pps_readout_hw_state(intel_dp, &hw);
1318
1319         if (hw.t1_t3 != sw->t1_t3 || hw.t8 != sw->t8 || hw.t9 != sw->t9 ||
1320             hw.t10 != sw->t10 || hw.t11_t12 != sw->t11_t12) {
1321                 drm_err(&i915->drm, "PPS state mismatch\n");
1322                 intel_pps_dump_state(intel_dp, "sw", sw);
1323                 intel_pps_dump_state(intel_dp, "hw", &hw);
1324         }
1325 }
1326
1327 static bool pps_delays_valid(struct edp_power_seq *delays)
1328 {
1329         return delays->t1_t3 || delays->t8 || delays->t9 ||
1330                 delays->t10 || delays->t11_t12;
1331 }
1332
1333 static void pps_init_delays_bios(struct intel_dp *intel_dp,
1334                                  struct edp_power_seq *bios)
1335 {
1336         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
1337
1338         lockdep_assert_held(&dev_priv->display.pps.mutex);
1339
1340         if (!pps_delays_valid(&intel_dp->pps.bios_pps_delays))
1341                 intel_pps_readout_hw_state(intel_dp, &intel_dp->pps.bios_pps_delays);
1342
1343         *bios = intel_dp->pps.bios_pps_delays;
1344
1345         intel_pps_dump_state(intel_dp, "bios", bios);
1346 }
1347
1348 static void pps_init_delays_vbt(struct intel_dp *intel_dp,
1349                                 struct edp_power_seq *vbt)
1350 {
1351         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
1352         struct intel_connector *connector = intel_dp->attached_connector;
1353
1354         *vbt = connector->panel.vbt.edp.pps;
1355
1356         if (!pps_delays_valid(vbt))
1357                 return;
1358
1359         /* On Toshiba Satellite P50-C-18C system the VBT T12 delay
1360          * of 500ms appears to be too short. Ocassionally the panel
1361          * just fails to power back on. Increasing the delay to 800ms
1362          * seems sufficient to avoid this problem.
1363          */
1364         if (intel_has_quirk(dev_priv, QUIRK_INCREASE_T12_DELAY)) {
1365                 vbt->t11_t12 = max_t(u16, vbt->t11_t12, 1300 * 10);
1366                 drm_dbg_kms(&dev_priv->drm,
1367                             "Increasing T12 panel delay as per the quirk to %d\n",
1368                             vbt->t11_t12);
1369         }
1370
1371         /* T11_T12 delay is special and actually in units of 100ms, but zero
1372          * based in the hw (so we need to add 100 ms). But the sw vbt
1373          * table multiplies it with 1000 to make it in units of 100usec,
1374          * too. */
1375         vbt->t11_t12 += 100 * 10;
1376
1377         intel_pps_dump_state(intel_dp, "vbt", vbt);
1378 }
1379
1380 static void pps_init_delays_spec(struct intel_dp *intel_dp,
1381                                  struct edp_power_seq *spec)
1382 {
1383         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
1384
1385         lockdep_assert_held(&dev_priv->display.pps.mutex);
1386
1387         /* Upper limits from eDP 1.3 spec. Note that we use the clunky units of
1388          * our hw here, which are all in 100usec. */
1389         spec->t1_t3 = 210 * 10;
1390         spec->t8 = 50 * 10; /* no limit for t8, use t7 instead */
1391         spec->t9 = 50 * 10; /* no limit for t9, make it symmetric with t8 */
1392         spec->t10 = 500 * 10;
1393         /* This one is special and actually in units of 100ms, but zero
1394          * based in the hw (so we need to add 100 ms). But the sw vbt
1395          * table multiplies it with 1000 to make it in units of 100usec,
1396          * too. */
1397         spec->t11_t12 = (510 + 100) * 10;
1398
1399         intel_pps_dump_state(intel_dp, "spec", spec);
1400 }
1401
1402 static void pps_init_delays(struct intel_dp *intel_dp)
1403 {
1404         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
1405         struct edp_power_seq cur, vbt, spec,
1406                 *final = &intel_dp->pps.pps_delays;
1407
1408         lockdep_assert_held(&dev_priv->display.pps.mutex);
1409
1410         /* already initialized? */
1411         if (pps_delays_valid(final))
1412                 return;
1413
1414         pps_init_delays_bios(intel_dp, &cur);
1415         pps_init_delays_vbt(intel_dp, &vbt);
1416         pps_init_delays_spec(intel_dp, &spec);
1417
1418         /* Use the max of the register settings and vbt. If both are
1419          * unset, fall back to the spec limits. */
1420 #define assign_final(field)     final->field = (max(cur.field, vbt.field) == 0 ? \
1421                                        spec.field : \
1422                                        max(cur.field, vbt.field))
1423         assign_final(t1_t3);
1424         assign_final(t8);
1425         assign_final(t9);
1426         assign_final(t10);
1427         assign_final(t11_t12);
1428 #undef assign_final
1429
1430 #define get_delay(field)        (DIV_ROUND_UP(final->field, 10))
1431         intel_dp->pps.panel_power_up_delay = get_delay(t1_t3);
1432         intel_dp->pps.backlight_on_delay = get_delay(t8);
1433         intel_dp->pps.backlight_off_delay = get_delay(t9);
1434         intel_dp->pps.panel_power_down_delay = get_delay(t10);
1435         intel_dp->pps.panel_power_cycle_delay = get_delay(t11_t12);
1436 #undef get_delay
1437
1438         drm_dbg_kms(&dev_priv->drm,
1439                     "panel power up delay %d, power down delay %d, power cycle delay %d\n",
1440                     intel_dp->pps.panel_power_up_delay,
1441                     intel_dp->pps.panel_power_down_delay,
1442                     intel_dp->pps.panel_power_cycle_delay);
1443
1444         drm_dbg_kms(&dev_priv->drm, "backlight on delay %d, off delay %d\n",
1445                     intel_dp->pps.backlight_on_delay,
1446                     intel_dp->pps.backlight_off_delay);
1447
1448         /*
1449          * We override the HW backlight delays to 1 because we do manual waits
1450          * on them. For T8, even BSpec recommends doing it. For T9, if we
1451          * don't do this, we'll end up waiting for the backlight off delay
1452          * twice: once when we do the manual sleep, and once when we disable
1453          * the panel and wait for the PP_STATUS bit to become zero.
1454          */
1455         final->t8 = 1;
1456         final->t9 = 1;
1457
1458         /*
1459          * HW has only a 100msec granularity for t11_t12 so round it up
1460          * accordingly.
1461          */
1462         final->t11_t12 = roundup(final->t11_t12, 100 * 10);
1463 }
1464
1465 static void pps_init_registers(struct intel_dp *intel_dp, bool force_disable_vdd)
1466 {
1467         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
1468         u32 pp_on, pp_off, port_sel = 0;
1469         int div = RUNTIME_INFO(dev_priv)->rawclk_freq / 1000;
1470         struct pps_registers regs;
1471         enum port port = dp_to_dig_port(intel_dp)->base.port;
1472         const struct edp_power_seq *seq = &intel_dp->pps.pps_delays;
1473
1474         lockdep_assert_held(&dev_priv->display.pps.mutex);
1475
1476         intel_pps_get_registers(intel_dp, &regs);
1477
1478         /*
1479          * On some VLV machines the BIOS can leave the VDD
1480          * enabled even on power sequencers which aren't
1481          * hooked up to any port. This would mess up the
1482          * power domain tracking the first time we pick
1483          * one of these power sequencers for use since
1484          * intel_pps_vdd_on_unlocked() would notice that the VDD was
1485          * already on and therefore wouldn't grab the power
1486          * domain reference. Disable VDD first to avoid this.
1487          * This also avoids spuriously turning the VDD on as
1488          * soon as the new power sequencer gets initialized.
1489          */
1490         if (force_disable_vdd) {
1491                 u32 pp = ilk_get_pp_control(intel_dp);
1492
1493                 drm_WARN(&dev_priv->drm, pp & PANEL_POWER_ON,
1494                          "Panel power already on\n");
1495
1496                 if (pp & EDP_FORCE_VDD)
1497                         drm_dbg_kms(&dev_priv->drm,
1498                                     "VDD already on, disabling first\n");
1499
1500                 pp &= ~EDP_FORCE_VDD;
1501
1502                 intel_de_write(dev_priv, regs.pp_ctrl, pp);
1503         }
1504
1505         pp_on = REG_FIELD_PREP(PANEL_POWER_UP_DELAY_MASK, seq->t1_t3) |
1506                 REG_FIELD_PREP(PANEL_LIGHT_ON_DELAY_MASK, seq->t8);
1507         pp_off = REG_FIELD_PREP(PANEL_LIGHT_OFF_DELAY_MASK, seq->t9) |
1508                 REG_FIELD_PREP(PANEL_POWER_DOWN_DELAY_MASK, seq->t10);
1509
1510         /* Haswell doesn't have any port selection bits for the panel
1511          * power sequencer any more. */
1512         if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
1513                 port_sel = PANEL_PORT_SELECT_VLV(port);
1514         } else if (HAS_PCH_IBX(dev_priv) || HAS_PCH_CPT(dev_priv)) {
1515                 switch (port) {
1516                 case PORT_A:
1517                         port_sel = PANEL_PORT_SELECT_DPA;
1518                         break;
1519                 case PORT_C:
1520                         port_sel = PANEL_PORT_SELECT_DPC;
1521                         break;
1522                 case PORT_D:
1523                         port_sel = PANEL_PORT_SELECT_DPD;
1524                         break;
1525                 default:
1526                         MISSING_CASE(port);
1527                         break;
1528                 }
1529         }
1530
1531         pp_on |= port_sel;
1532
1533         intel_de_write(dev_priv, regs.pp_on, pp_on);
1534         intel_de_write(dev_priv, regs.pp_off, pp_off);
1535
1536         /*
1537          * Compute the divisor for the pp clock, simply match the Bspec formula.
1538          */
1539         if (i915_mmio_reg_valid(regs.pp_div))
1540                 intel_de_write(dev_priv, regs.pp_div,
1541                                REG_FIELD_PREP(PP_REFERENCE_DIVIDER_MASK, (100 * div) / 2 - 1) | REG_FIELD_PREP(PANEL_POWER_CYCLE_DELAY_MASK, DIV_ROUND_UP(seq->t11_t12, 1000)));
1542         else
1543                 intel_de_rmw(dev_priv, regs.pp_ctrl, BXT_POWER_CYCLE_DELAY_MASK,
1544                              REG_FIELD_PREP(BXT_POWER_CYCLE_DELAY_MASK,
1545                                             DIV_ROUND_UP(seq->t11_t12, 1000)));
1546
1547         drm_dbg_kms(&dev_priv->drm,
1548                     "panel power sequencer register settings: PP_ON %#x, PP_OFF %#x, PP_DIV %#x\n",
1549                     intel_de_read(dev_priv, regs.pp_on),
1550                     intel_de_read(dev_priv, regs.pp_off),
1551                     i915_mmio_reg_valid(regs.pp_div) ?
1552                     intel_de_read(dev_priv, regs.pp_div) :
1553                     (intel_de_read(dev_priv, regs.pp_ctrl) & BXT_POWER_CYCLE_DELAY_MASK));
1554 }
1555
1556 void intel_pps_encoder_reset(struct intel_dp *intel_dp)
1557 {
1558         struct drm_i915_private *i915 = dp_to_i915(intel_dp);
1559         intel_wakeref_t wakeref;
1560
1561         if (!intel_dp_is_edp(intel_dp))
1562                 return;
1563
1564         with_intel_pps_lock(intel_dp, wakeref) {
1565                 /*
1566                  * Reinit the power sequencer also on the resume path, in case
1567                  * BIOS did something nasty with it.
1568                  */
1569                 if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915))
1570                         vlv_initial_power_sequencer_setup(intel_dp);
1571
1572                 pps_init_delays(intel_dp);
1573                 pps_init_registers(intel_dp, false);
1574                 pps_vdd_init(intel_dp);
1575
1576                 if (edp_have_panel_vdd(intel_dp))
1577                         edp_panel_vdd_schedule_off(intel_dp);
1578         }
1579 }
1580
1581 bool intel_pps_init(struct intel_dp *intel_dp)
1582 {
1583         intel_wakeref_t wakeref;
1584         bool ret;
1585
1586         intel_dp->pps.initializing = true;
1587         INIT_DELAYED_WORK(&intel_dp->pps.panel_vdd_work, edp_panel_vdd_work);
1588
1589         pps_init_timestamps(intel_dp);
1590
1591         with_intel_pps_lock(intel_dp, wakeref) {
1592                 ret = pps_initial_setup(intel_dp);
1593
1594                 pps_init_delays(intel_dp);
1595                 pps_init_registers(intel_dp, false);
1596                 pps_vdd_init(intel_dp);
1597         }
1598
1599         return ret;
1600 }
1601
1602 static void pps_init_late(struct intel_dp *intel_dp)
1603 {
1604         struct drm_i915_private *i915 = dp_to_i915(intel_dp);
1605         struct intel_encoder *encoder = &dp_to_dig_port(intel_dp)->base;
1606         struct intel_connector *connector = intel_dp->attached_connector;
1607
1608         if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915))
1609                 return;
1610
1611         if (intel_num_pps(i915) < 2)
1612                 return;
1613
1614         drm_WARN(&i915->drm, connector->panel.vbt.backlight.controller >= 0 &&
1615                  intel_dp->pps.pps_idx != connector->panel.vbt.backlight.controller,
1616                  "[ENCODER:%d:%s] power sequencer mismatch: %d (initial) vs. %d (VBT)\n",
1617                  encoder->base.base.id, encoder->base.name,
1618                  intel_dp->pps.pps_idx, connector->panel.vbt.backlight.controller);
1619
1620         if (connector->panel.vbt.backlight.controller >= 0)
1621                 intel_dp->pps.pps_idx = connector->panel.vbt.backlight.controller;
1622 }
1623
1624 void intel_pps_init_late(struct intel_dp *intel_dp)
1625 {
1626         intel_wakeref_t wakeref;
1627
1628         with_intel_pps_lock(intel_dp, wakeref) {
1629                 /* Reinit delays after per-panel info has been parsed from VBT */
1630                 pps_init_late(intel_dp);
1631
1632                 memset(&intel_dp->pps.pps_delays, 0, sizeof(intel_dp->pps.pps_delays));
1633                 pps_init_delays(intel_dp);
1634                 pps_init_registers(intel_dp, false);
1635
1636                 intel_dp->pps.initializing = false;
1637
1638                 if (edp_have_panel_vdd(intel_dp))
1639                         edp_panel_vdd_schedule_off(intel_dp);
1640         }
1641 }
1642
1643 void intel_pps_unlock_regs_wa(struct drm_i915_private *dev_priv)
1644 {
1645         int pps_num;
1646         int pps_idx;
1647
1648         if (!HAS_DISPLAY(dev_priv) || HAS_DDI(dev_priv))
1649                 return;
1650         /*
1651          * This w/a is needed at least on CPT/PPT, but to be sure apply it
1652          * everywhere where registers can be write protected.
1653          */
1654         pps_num = intel_num_pps(dev_priv);
1655
1656         for (pps_idx = 0; pps_idx < pps_num; pps_idx++) {
1657                 u32 val = intel_de_read(dev_priv, PP_CONTROL(pps_idx));
1658
1659                 val = (val & ~PANEL_UNLOCK_MASK) | PANEL_UNLOCK_REGS;
1660                 intel_de_write(dev_priv, PP_CONTROL(pps_idx), val);
1661         }
1662 }
1663
1664 void intel_pps_setup(struct drm_i915_private *i915)
1665 {
1666         if (HAS_PCH_SPLIT(i915) || IS_GEMINILAKE(i915) || IS_BROXTON(i915))
1667                 i915->display.pps.mmio_base = PCH_PPS_BASE;
1668         else if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915))
1669                 i915->display.pps.mmio_base = VLV_PPS_BASE;
1670         else
1671                 i915->display.pps.mmio_base = PPS_BASE;
1672 }
1673
1674 void assert_pps_unlocked(struct drm_i915_private *dev_priv, enum pipe pipe)
1675 {
1676         i915_reg_t pp_reg;
1677         u32 val;
1678         enum pipe panel_pipe = INVALID_PIPE;
1679         bool locked = true;
1680
1681         if (drm_WARN_ON(&dev_priv->drm, HAS_DDI(dev_priv)))
1682                 return;
1683
1684         if (HAS_PCH_SPLIT(dev_priv)) {
1685                 u32 port_sel;
1686
1687                 pp_reg = PP_CONTROL(0);
1688                 port_sel = intel_de_read(dev_priv, PP_ON_DELAYS(0)) & PANEL_PORT_SELECT_MASK;
1689
1690                 switch (port_sel) {
1691                 case PANEL_PORT_SELECT_LVDS:
1692                         intel_lvds_port_enabled(dev_priv, PCH_LVDS, &panel_pipe);
1693                         break;
1694                 case PANEL_PORT_SELECT_DPA:
1695                         g4x_dp_port_enabled(dev_priv, DP_A, PORT_A, &panel_pipe);
1696                         break;
1697                 case PANEL_PORT_SELECT_DPC:
1698                         g4x_dp_port_enabled(dev_priv, PCH_DP_C, PORT_C, &panel_pipe);
1699                         break;
1700                 case PANEL_PORT_SELECT_DPD:
1701                         g4x_dp_port_enabled(dev_priv, PCH_DP_D, PORT_D, &panel_pipe);
1702                         break;
1703                 default:
1704                         MISSING_CASE(port_sel);
1705                         break;
1706                 }
1707         } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
1708                 /* presumably write lock depends on pipe, not port select */
1709                 pp_reg = PP_CONTROL(pipe);
1710                 panel_pipe = pipe;
1711         } else {
1712                 u32 port_sel;
1713
1714                 pp_reg = PP_CONTROL(0);
1715                 port_sel = intel_de_read(dev_priv, PP_ON_DELAYS(0)) & PANEL_PORT_SELECT_MASK;
1716
1717                 drm_WARN_ON(&dev_priv->drm,
1718                             port_sel != PANEL_PORT_SELECT_LVDS);
1719                 intel_lvds_port_enabled(dev_priv, LVDS, &panel_pipe);
1720         }
1721
1722         val = intel_de_read(dev_priv, pp_reg);
1723         if (!(val & PANEL_POWER_ON) ||
1724             ((val & PANEL_UNLOCK_MASK) == PANEL_UNLOCK_REGS))
1725                 locked = false;
1726
1727         I915_STATE_WARN(panel_pipe == pipe && locked,
1728                         "panel assertion failure, pipe %c regs locked\n",
1729                         pipe_name(pipe));
1730 }