drivers/gpu/drm/i915/intel_runtime_pm.c

   1 /*
   2  * Copyright © 2012-2014 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Eugeni Dodonov <eugeni.dodonov@intel.com>
  25  *    Daniel Vetter <daniel.vetter@ffwll.ch>
  26  *
  27  */
  28
  29 #include <linux/pm_runtime.h>
  30 #include <linux/vgaarb.h>
  31
  32 #include "i915_drv.h"
  33 #include "intel_drv.h"
  34
  35 /**
  36  * DOC: runtime pm
  37  *
  38  * The i915 driver supports dynamic enabling and disabling of entire hardware
  39  * blocks at runtime. This is especially important on the display side where
  40  * software is supposed to control many power gates manually on recent hardware,
  41  * since on the GT side a lot of the power management is done by the hardware.
  42  * But even there some manual control at the device level is required.
  43  *
  44  * Since i915 supports a diverse set of platforms with a unified codebase and
  45  * hardware engineers just love to shuffle functionality around between power
  46  * domains there's a sizeable amount of indirection required. This file provides
  47  * generic functions to the driver for grabbing and releasing references for
  48  * abstract power domains. It then maps those to the actual power wells
  49  * present for a given platform.
  50  */
  51
  52 #define GEN9_ENABLE_DC5(dev) 0
  53 #define SKL_ENABLE_DC6(dev) IS_SKYLAKE(dev)
  54
  55 #define for_each_power_well(i, power_well, domain_mask, power_domains)  \
  56         for (i = 0;                                                     \
  57              i < (power_domains)->power_well_count &&                   \
  58                  ((power_well) = &(power_domains)->power_wells[i]);     \
  59              i++)                                                       \
  60                 if ((power_well)->domains & (domain_mask))
  61
  62 #define for_each_power_well_rev(i, power_well, domain_mask, power_domains) \
  63         for (i = (power_domains)->power_well_count - 1;                  \
  64              i >= 0 && ((power_well) = &(power_domains)->power_wells[i]);\
  65              i--)                                                        \
  66                 if ((power_well)->domains & (domain_mask))
  67
  68 bool intel_display_power_well_is_enabled(struct drm_i915_private *dev_priv,
  69                                     int power_well_id);
  70
  71 /*
  72  * We should only use the power well if we explicitly asked the hardware to
  73  * enable it, so check if it's enabled and also check if we've requested it to
  74  * be enabled.
  75  */
  76 static bool hsw_power_well_enabled(struct drm_i915_private *dev_priv,
  77                                    struct i915_power_well *power_well)
  78 {
  79         return I915_READ(HSW_PWR_WELL_DRIVER) ==
  80                      (HSW_PWR_WELL_ENABLE_REQUEST | HSW_PWR_WELL_STATE_ENABLED);
  81 }
  82
  83 /**
  84  * __intel_display_power_is_enabled - unlocked check for a power domain
  85  * @dev_priv: i915 device instance
  86  * @domain: power domain to check
  87  *
  88  * This is the unlocked version of intel_display_power_is_enabled() and should
  89  * only be used from error capture and recovery code where deadlocks are
  90  * possible.
  91  *
  92  * Returns:
  93  * True when the power domain is enabled, false otherwise.
  94  */
  95 bool __intel_display_power_is_enabled(struct drm_i915_private *dev_priv,
  96                                       enum intel_display_power_domain domain)
  97 {
  98         struct i915_power_domains *power_domains;
  99         struct i915_power_well *power_well;
 100         bool is_enabled;
 101         int i;
 102
 103         if (dev_priv->pm.suspended)
 104                 return false;
 105
 106         power_domains = &dev_priv->power_domains;
 107
 108         is_enabled = true;
 109
 110         for_each_power_well_rev(i, power_well, BIT(domain), power_domains) {
 111                 if (power_well->always_on)
 112                         continue;
 113
 114                 if (!power_well->hw_enabled) {
 115                         is_enabled = false;
 116                         break;
 117                 }
 118         }
 119
 120         return is_enabled;
 121 }
 122
 123 /**
 124  * intel_display_power_is_enabled - check for a power domain
 125  * @dev_priv: i915 device instance
 126  * @domain: power domain to check
 127  *
 128  * This function can be used to check the hw power domain state. It is mostly
 129  * used in hardware state readout functions. Everywhere else code should rely
 130  * upon explicit power domain reference counting to ensure that the hardware
 131  * block is powered up before accessing it.
 132  *
 133  * Callers must hold the relevant modesetting locks to ensure that concurrent
 134  * threads can't disable the power well while the caller tries to read a few
 135  * registers.
 136  *
 137  * Returns:
 138  * True when the power domain is enabled, false otherwise.
 139  */
 140 bool intel_display_power_is_enabled(struct drm_i915_private *dev_priv,
 141                                     enum intel_display_power_domain domain)
 142 {
 143         struct i915_power_domains *power_domains;
 144         bool ret;
 145
 146         power_domains = &dev_priv->power_domains;
 147
 148         mutex_lock(&power_domains->lock);
 149         ret = __intel_display_power_is_enabled(dev_priv, domain);
 150         mutex_unlock(&power_domains->lock);
 151
 152         return ret;
 153 }
 154
 155 /**
 156  * intel_display_set_init_power - set the initial power domain state
 157  * @dev_priv: i915 device instance
 158  * @enable: whether to enable or disable the initial power domain state
 159  *
 160  * For simplicity our driver load/unload and system suspend/resume code assumes
 161  * that all power domains are always enabled. This functions controls the state
 162  * of this little hack. While the initial power domain state is enabled runtime
 163  * pm is effectively disabled.
 164  */
 165 void intel_display_set_init_power(struct drm_i915_private *dev_priv,
 166                                   bool enable)
 167 {
 168         if (dev_priv->power_domains.init_power_on == enable)
 169                 return;
 170
 171         if (enable)
 172                 intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);
 173         else
 174                 intel_display_power_put(dev_priv, POWER_DOMAIN_INIT);
 175
 176         dev_priv->power_domains.init_power_on = enable;
 177 }
 178
 179 /*
 180  * Starting with Haswell, we have a "Power Down Well" that can be turned off
 181  * when not needed anymore. We have 4 registers that can request the power well
 182  * to be enabled, and it will only be disabled if none of the registers is
 183  * requesting it to be enabled.
 184  */
 185 static void hsw_power_well_post_enable(struct drm_i915_private *dev_priv)
 186 {
 187         struct drm_device *dev = dev_priv->dev;
 188
 189         /*
 190          * After we re-enable the power well, if we touch VGA register 0x3d5
 191          * we'll get unclaimed register interrupts. This stops after we write
 192          * anything to the VGA MSR register. The vgacon module uses this
 193          * register all the time, so if we unbind our driver and, as a
 194          * consequence, bind vgacon, we'll get stuck in an infinite loop at
 195          * console_unlock(). So make here we touch the VGA MSR register, making
 196          * sure vgacon can keep working normally without triggering interrupts
 197          * and error messages.
 198          */
 199         vga_get_uninterruptible(dev->pdev, VGA_RSRC_LEGACY_IO);
 200         outb(inb(VGA_MSR_READ), VGA_MSR_WRITE);
 201         vga_put(dev->pdev, VGA_RSRC_LEGACY_IO);
 202
 203         if (IS_BROADWELL(dev))
 204                 gen8_irq_power_well_post_enable(dev_priv,
 205                                                 1 << PIPE_C | 1 << PIPE_B);
 206 }
 207
 208 static void skl_power_well_post_enable(struct drm_i915_private *dev_priv,
 209                                        struct i915_power_well *power_well)
 210 {
 211         struct drm_device *dev = dev_priv->dev;
 212
 213         /*
 214          * After we re-enable the power well, if we touch VGA register 0x3d5
 215          * we'll get unclaimed register interrupts. This stops after we write
 216          * anything to the VGA MSR register. The vgacon module uses this
 217          * register all the time, so if we unbind our driver and, as a
 218          * consequence, bind vgacon, we'll get stuck in an infinite loop at
 219          * console_unlock(). So make here we touch the VGA MSR register, making
 220          * sure vgacon can keep working normally without triggering interrupts
 221          * and error messages.
 222          */
 223         if (power_well->data == SKL_DISP_PW_2) {
 224                 vga_get_uninterruptible(dev->pdev, VGA_RSRC_LEGACY_IO);
 225                 outb(inb(VGA_MSR_READ), VGA_MSR_WRITE);
 226                 vga_put(dev->pdev, VGA_RSRC_LEGACY_IO);
 227
 228                 gen8_irq_power_well_post_enable(dev_priv,
 229                                                 1 << PIPE_C | 1 << PIPE_B);
 230         }
 231
 232         if (power_well->data == SKL_DISP_PW_1) {
 233                 intel_prepare_ddi(dev);
 234                 gen8_irq_power_well_post_enable(dev_priv, 1 << PIPE_A);
 235         }
 236 }
 237
 238 static void hsw_set_power_well(struct drm_i915_private *dev_priv,
 239                                struct i915_power_well *power_well, bool enable)
 240 {
 241         bool is_enabled, enable_requested;
 242         uint32_t tmp;
 243
 244         tmp = I915_READ(HSW_PWR_WELL_DRIVER);
 245         is_enabled = tmp & HSW_PWR_WELL_STATE_ENABLED;
 246         enable_requested = tmp & HSW_PWR_WELL_ENABLE_REQUEST;
 247
 248         if (enable) {
 249                 if (!enable_requested)
 250                         I915_WRITE(HSW_PWR_WELL_DRIVER,
 251                                    HSW_PWR_WELL_ENABLE_REQUEST);
 252
 253                 if (!is_enabled) {
 254                         DRM_DEBUG_KMS("Enabling power well\n");
 255                         if (wait_for((I915_READ(HSW_PWR_WELL_DRIVER) &
 256                                       HSW_PWR_WELL_STATE_ENABLED), 20))
 257                                 DRM_ERROR("Timeout enabling power well\n");
 258                         hsw_power_well_post_enable(dev_priv);
 259                 }
 260
 261         } else {
 262                 if (enable_requested) {
 263                         I915_WRITE(HSW_PWR_WELL_DRIVER, 0);
 264                         POSTING_READ(HSW_PWR_WELL_DRIVER);
 265                         DRM_DEBUG_KMS("Requesting to disable the power well\n");
 266                 }
 267         }
 268 }
 269
 270 #define SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS (         \
 271         BIT(POWER_DOMAIN_TRANSCODER_A) |                \
 272         BIT(POWER_DOMAIN_PIPE_B) |                      \
 273         BIT(POWER_DOMAIN_TRANSCODER_B) |                \
 274         BIT(POWER_DOMAIN_PIPE_C) |                      \
 275         BIT(POWER_DOMAIN_TRANSCODER_C) |                \
 276         BIT(POWER_DOMAIN_PIPE_B_PANEL_FITTER) |         \
 277         BIT(POWER_DOMAIN_PIPE_C_PANEL_FITTER) |         \
 278         BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) |          \
 279         BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) |          \
 280         BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) |          \
 281         BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) |          \
 282         BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) |          \
 283         BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) |          \
 284         BIT(POWER_DOMAIN_AUX_B) |                       \
 285         BIT(POWER_DOMAIN_AUX_C) |                       \
 286         BIT(POWER_DOMAIN_AUX_D) |                       \
 287         BIT(POWER_DOMAIN_AUDIO) |                       \
 288         BIT(POWER_DOMAIN_VGA) |                         \
 289         BIT(POWER_DOMAIN_INIT))
 290 #define SKL_DISPLAY_POWERWELL_1_POWER_DOMAINS (         \
 291         SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS |         \
 292         BIT(POWER_DOMAIN_PLLS) |                        \
 293         BIT(POWER_DOMAIN_PIPE_A) |                      \
 294         BIT(POWER_DOMAIN_TRANSCODER_EDP) |              \
 295         BIT(POWER_DOMAIN_PIPE_A_PANEL_FITTER) |         \
 296         BIT(POWER_DOMAIN_PORT_DDI_A_2_LANES) |          \
 297         BIT(POWER_DOMAIN_PORT_DDI_A_4_LANES) |          \
 298         BIT(POWER_DOMAIN_AUX_A) |                       \
 299         BIT(POWER_DOMAIN_INIT))
 300 #define SKL_DISPLAY_DDI_A_E_POWER_DOMAINS (             \
 301         BIT(POWER_DOMAIN_PORT_DDI_A_2_LANES) |          \
 302         BIT(POWER_DOMAIN_PORT_DDI_A_4_LANES) |          \
 303         BIT(POWER_DOMAIN_INIT))
 304 #define SKL_DISPLAY_DDI_B_POWER_DOMAINS (               \
 305         BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) |          \
 306         BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) |          \
 307         BIT(POWER_DOMAIN_INIT))
 308 #define SKL_DISPLAY_DDI_C_POWER_DOMAINS (               \
 309         BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) |          \
 310         BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) |          \
 311         BIT(POWER_DOMAIN_INIT))
 312 #define SKL_DISPLAY_DDI_D_POWER_DOMAINS (               \
 313         BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) |          \
 314         BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) |          \
 315         BIT(POWER_DOMAIN_INIT))
 316 #define SKL_DISPLAY_MISC_IO_POWER_DOMAINS (             \
 317         SKL_DISPLAY_POWERWELL_1_POWER_DOMAINS |         \
 318         BIT(POWER_DOMAIN_PLLS) |                        \
 319         BIT(POWER_DOMAIN_INIT))
 320 #define SKL_DISPLAY_ALWAYS_ON_POWER_DOMAINS (           \
 321         (POWER_DOMAIN_MASK & ~(SKL_DISPLAY_POWERWELL_1_POWER_DOMAINS |  \
 322         SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS |         \
 323         SKL_DISPLAY_DDI_A_E_POWER_DOMAINS |             \
 324         SKL_DISPLAY_DDI_B_POWER_DOMAINS |               \
 325         SKL_DISPLAY_DDI_C_POWER_DOMAINS |               \
 326         SKL_DISPLAY_DDI_D_POWER_DOMAINS |               \
 327         SKL_DISPLAY_MISC_IO_POWER_DOMAINS)) |           \
 328         BIT(POWER_DOMAIN_INIT))
 329
 330 #define BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS (         \
 331         BIT(POWER_DOMAIN_TRANSCODER_A) |                \
 332         BIT(POWER_DOMAIN_PIPE_B) |                      \
 333         BIT(POWER_DOMAIN_TRANSCODER_B) |                \
 334         BIT(POWER_DOMAIN_PIPE_C) |                      \
 335         BIT(POWER_DOMAIN_TRANSCODER_C) |                \
 336         BIT(POWER_DOMAIN_PIPE_B_PANEL_FITTER) |         \
 337         BIT(POWER_DOMAIN_PIPE_C_PANEL_FITTER) |         \
 338         BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) |          \
 339         BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) |          \
 340         BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) |          \
 341         BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) |          \
 342         BIT(POWER_DOMAIN_AUX_B) |                       \
 343         BIT(POWER_DOMAIN_AUX_C) |                       \
 344         BIT(POWER_DOMAIN_AUDIO) |                       \
 345         BIT(POWER_DOMAIN_VGA) |                         \
 346         BIT(POWER_DOMAIN_INIT))
 347 #define BXT_DISPLAY_POWERWELL_1_POWER_DOMAINS (         \
 348         BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS |         \
 349         BIT(POWER_DOMAIN_PIPE_A) |                      \
 350         BIT(POWER_DOMAIN_TRANSCODER_EDP) |              \
 351         BIT(POWER_DOMAIN_PIPE_A_PANEL_FITTER) |         \
 352         BIT(POWER_DOMAIN_PORT_DDI_A_2_LANES) |          \
 353         BIT(POWER_DOMAIN_PORT_DDI_A_4_LANES) |          \
 354         BIT(POWER_DOMAIN_AUX_A) |                       \
 355         BIT(POWER_DOMAIN_PLLS) |                        \
 356         BIT(POWER_DOMAIN_INIT))
 357 #define BXT_DISPLAY_ALWAYS_ON_POWER_DOMAINS (           \
 358         (POWER_DOMAIN_MASK & ~(BXT_DISPLAY_POWERWELL_1_POWER_DOMAINS |  \
 359         BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS)) |       \
 360         BIT(POWER_DOMAIN_INIT))
 361
 362 static void assert_can_enable_dc9(struct drm_i915_private *dev_priv)
 363 {
 364         struct drm_device *dev = dev_priv->dev;
 365
 366         WARN(!IS_BROXTON(dev), "Platform doesn't support DC9.\n");
 367         WARN((I915_READ(DC_STATE_EN) & DC_STATE_EN_DC9),
 368                 "DC9 already programmed to be enabled.\n");
 369         WARN(I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5,
 370                 "DC5 still not disabled to enable DC9.\n");
 371         WARN(I915_READ(HSW_PWR_WELL_DRIVER), "Power well on.\n");
 372         WARN(intel_irqs_enabled(dev_priv), "Interrupts not disabled yet.\n");
 373
 374          /*
 375           * TODO: check for the following to verify the conditions to enter DC9
 376           * state are satisfied:
 377           * 1] Check relevant display engine registers to verify if mode set
 378           * disable sequence was followed.
 379           * 2] Check if display uninitialize sequence is initialized.
 380           */
 381 }
 382
 383 static void assert_can_disable_dc9(struct drm_i915_private *dev_priv)
 384 {
 385         WARN(intel_irqs_enabled(dev_priv), "Interrupts not disabled yet.\n");
 386         WARN(!(I915_READ(DC_STATE_EN) & DC_STATE_EN_DC9),
 387                 "DC9 already programmed to be disabled.\n");
 388         WARN(I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5,
 389                 "DC5 still not disabled.\n");
 390
 391          /*
 392           * TODO: check for the following to verify DC9 state was indeed
 393           * entered before programming to disable it:
 394           * 1] Check relevant display engine registers to verify if mode
 395           *  set disable sequence was followed.
 396           * 2] Check if display uninitialize sequence is initialized.
 397           */
 398 }
 399
 400 void bxt_enable_dc9(struct drm_i915_private *dev_priv)
 401 {
 402         uint32_t val;
 403
 404         assert_can_enable_dc9(dev_priv);
 405
 406         DRM_DEBUG_KMS("Enabling DC9\n");
 407
 408         val = I915_READ(DC_STATE_EN);
 409         val |= DC_STATE_EN_DC9;
 410         I915_WRITE(DC_STATE_EN, val);
 411         POSTING_READ(DC_STATE_EN);
 412 }
 413
 414 void bxt_disable_dc9(struct drm_i915_private *dev_priv)
 415 {
 416         uint32_t val;
 417
 418         assert_can_disable_dc9(dev_priv);
 419
 420         DRM_DEBUG_KMS("Disabling DC9\n");
 421
 422         val = I915_READ(DC_STATE_EN);
 423         val &= ~DC_STATE_EN_DC9;
 424         I915_WRITE(DC_STATE_EN, val);
 425         POSTING_READ(DC_STATE_EN);
 426 }
 427
 428 static void gen9_set_dc_state_debugmask_memory_up(
 429                         struct drm_i915_private *dev_priv)
 430 {
 431         uint32_t val;
 432
 433         /* The below bit doesn't need to be cleared ever afterwards */
 434         val = I915_READ(DC_STATE_DEBUG);
 435         if (!(val & DC_STATE_DEBUG_MASK_MEMORY_UP)) {
 436                 val |= DC_STATE_DEBUG_MASK_MEMORY_UP;
 437                 I915_WRITE(DC_STATE_DEBUG, val);
 438                 POSTING_READ(DC_STATE_DEBUG);
 439         }
 440 }
 441
 442 static void assert_can_enable_dc5(struct drm_i915_private *dev_priv)
 443 {
 444         struct drm_device *dev = dev_priv->dev;
 445         bool pg2_enabled = intel_display_power_well_is_enabled(dev_priv,
 446                                         SKL_DISP_PW_2);
 447
 448         WARN(!IS_SKYLAKE(dev), "Platform doesn't support DC5.\n");
 449         WARN(!HAS_RUNTIME_PM(dev), "Runtime PM not enabled.\n");
 450         WARN(pg2_enabled, "PG2 not disabled to enable DC5.\n");
 451
 452         WARN((I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5),
 453                                 "DC5 already programmed to be enabled.\n");
 454         WARN(dev_priv->pm.suspended,
 455                 "DC5 cannot be enabled, if platform is runtime-suspended.\n");
 456
 457         assert_csr_loaded(dev_priv);
 458 }
 459
 460 static void assert_can_disable_dc5(struct drm_i915_private *dev_priv)
 461 {
 462         bool pg2_enabled = intel_display_power_well_is_enabled(dev_priv,
 463                                         SKL_DISP_PW_2);
 464         /*
 465          * During initialization, the firmware may not be loaded yet.
 466          * We still want to make sure that the DC enabling flag is cleared.
 467          */
 468         if (dev_priv->power_domains.initializing)
 469                 return;
 470
 471         WARN(!pg2_enabled, "PG2 not enabled to disable DC5.\n");
 472         WARN(dev_priv->pm.suspended,
 473                 "Disabling of DC5 while platform is runtime-suspended should never happen.\n");
 474 }
 475
 476 static void gen9_enable_dc5(struct drm_i915_private *dev_priv)
 477 {
 478         uint32_t val;
 479
 480         assert_can_enable_dc5(dev_priv);
 481
 482         DRM_DEBUG_KMS("Enabling DC5\n");
 483
 484         gen9_set_dc_state_debugmask_memory_up(dev_priv);
 485
 486         val = I915_READ(DC_STATE_EN);
 487         val &= ~DC_STATE_EN_UPTO_DC5_DC6_MASK;
 488         val |= DC_STATE_EN_UPTO_DC5;
 489         I915_WRITE(DC_STATE_EN, val);
 490         POSTING_READ(DC_STATE_EN);
 491 }
 492
 493 static void gen9_disable_dc5(struct drm_i915_private *dev_priv)
 494 {
 495         uint32_t val;
 496
 497         assert_can_disable_dc5(dev_priv);
 498
 499         DRM_DEBUG_KMS("Disabling DC5\n");
 500
 501         val = I915_READ(DC_STATE_EN);
 502         val &= ~DC_STATE_EN_UPTO_DC5;
 503         I915_WRITE(DC_STATE_EN, val);
 504         POSTING_READ(DC_STATE_EN);
 505 }
 506
 507 static void assert_can_enable_dc6(struct drm_i915_private *dev_priv)
 508 {
 509         struct drm_device *dev = dev_priv->dev;
 510
 511         WARN(!IS_SKYLAKE(dev), "Platform doesn't support DC6.\n");
 512         WARN(!HAS_RUNTIME_PM(dev), "Runtime PM not enabled.\n");
 513         WARN(I915_READ(UTIL_PIN_CTL) & UTIL_PIN_ENABLE,
 514                 "Backlight is not disabled.\n");
 515         WARN((I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC6),
 516                 "DC6 already programmed to be enabled.\n");
 517
 518         assert_csr_loaded(dev_priv);
 519 }
 520
 521 static void assert_can_disable_dc6(struct drm_i915_private *dev_priv)
 522 {
 523         /*
 524          * During initialization, the firmware may not be loaded yet.
 525          * We still want to make sure that the DC enabling flag is cleared.
 526          */
 527         if (dev_priv->power_domains.initializing)
 528                 return;
 529
 530         assert_csr_loaded(dev_priv);
 531         WARN(!(I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC6),
 532                 "DC6 already programmed to be disabled.\n");
 533 }
 534
 535 static void skl_enable_dc6(struct drm_i915_private *dev_priv)
 536 {
 537         uint32_t val;
 538
 539         assert_can_enable_dc6(dev_priv);
 540
 541         DRM_DEBUG_KMS("Enabling DC6\n");
 542
 543         gen9_set_dc_state_debugmask_memory_up(dev_priv);
 544
 545         val = I915_READ(DC_STATE_EN);
 546         val &= ~DC_STATE_EN_UPTO_DC5_DC6_MASK;
 547         val |= DC_STATE_EN_UPTO_DC6;
 548         I915_WRITE(DC_STATE_EN, val);
 549         POSTING_READ(DC_STATE_EN);
 550 }
 551
 552 static void skl_disable_dc6(struct drm_i915_private *dev_priv)
 553 {
 554         uint32_t val;
 555
 556         assert_can_disable_dc6(dev_priv);
 557
 558         DRM_DEBUG_KMS("Disabling DC6\n");
 559
 560         val = I915_READ(DC_STATE_EN);
 561         val &= ~DC_STATE_EN_UPTO_DC6;
 562         I915_WRITE(DC_STATE_EN, val);
 563         POSTING_READ(DC_STATE_EN);
 564 }
 565
 566 static void skl_set_power_well(struct drm_i915_private *dev_priv,
 567                         struct i915_power_well *power_well, bool enable)
 568 {
 569         struct drm_device *dev = dev_priv->dev;
 570         uint32_t tmp, fuse_status;
 571         uint32_t req_mask, state_mask;
 572         bool is_enabled, enable_requested, check_fuse_status = false;
 573
 574         tmp = I915_READ(HSW_PWR_WELL_DRIVER);
 575         fuse_status = I915_READ(SKL_FUSE_STATUS);
 576
 577         switch (power_well->data) {
 578         case SKL_DISP_PW_1:
 579                 if (wait_for((I915_READ(SKL_FUSE_STATUS) &
 580                         SKL_FUSE_PG0_DIST_STATUS), 1)) {
 581                         DRM_ERROR("PG0 not enabled\n");
 582                         return;
 583                 }
 584                 break;
 585         case SKL_DISP_PW_2:
 586                 if (!(fuse_status & SKL_FUSE_PG1_DIST_STATUS)) {
 587                         DRM_ERROR("PG1 in disabled state\n");
 588                         return;
 589                 }
 590                 break;
 591         case SKL_DISP_PW_DDI_A_E:
 592         case SKL_DISP_PW_DDI_B:
 593         case SKL_DISP_PW_DDI_C:
 594         case SKL_DISP_PW_DDI_D:
 595         case SKL_DISP_PW_MISC_IO:
 596                 break;
 597         default:
 598                 WARN(1, "Unknown power well %lu\n", power_well->data);
 599                 return;
 600         }
 601
 602         req_mask = SKL_POWER_WELL_REQ(power_well->data);
 603         enable_requested = tmp & req_mask;
 604         state_mask = SKL_POWER_WELL_STATE(power_well->data);
 605         is_enabled = tmp & state_mask;
 606
 607         if (enable) {
 608                 if (!enable_requested) {
 609                         WARN((tmp & state_mask) &&
 610                                 !I915_READ(HSW_PWR_WELL_BIOS),
 611                                 "Invalid for power well status to be enabled, unless done by the BIOS, \
 612                                 when request is to disable!\n");
 613                         if ((GEN9_ENABLE_DC5(dev) || SKL_ENABLE_DC6(dev)) &&
 614                                 power_well->data == SKL_DISP_PW_2) {
 615                                 if (SKL_ENABLE_DC6(dev)) {
 616                                         skl_disable_dc6(dev_priv);
 617                                         /*
 618                                          * DDI buffer programming unnecessary during driver-load/resume
 619                                          * as it's already done during modeset initialization then.
 620                                          * It's also invalid here as encoder list is still uninitialized.
 621                                          */
 622                                         if (!dev_priv->power_domains.initializing)
 623                                                 intel_prepare_ddi(dev);
 624                                 } else {
 625                                         gen9_disable_dc5(dev_priv);
 626                                 }
 627                         }
 628                         I915_WRITE(HSW_PWR_WELL_DRIVER, tmp | req_mask);
 629                 }
 630
 631                 if (!is_enabled) {
 632                         DRM_DEBUG_KMS("Enabling %s\n", power_well->name);
 633                         if (wait_for((I915_READ(HSW_PWR_WELL_DRIVER) &
 634                                 state_mask), 1))
 635                                 DRM_ERROR("%s enable timeout\n",
 636                                         power_well->name);
 637                         check_fuse_status = true;
 638                 }
 639         } else {
 640                 if (enable_requested) {
 641                         I915_WRITE(HSW_PWR_WELL_DRIVER, tmp & ~req_mask);
 642                         POSTING_READ(HSW_PWR_WELL_DRIVER);
 643                         DRM_DEBUG_KMS("Disabling %s\n", power_well->name);
 644
 645                         if ((GEN9_ENABLE_DC5(dev) || SKL_ENABLE_DC6(dev)) &&
 646                                 power_well->data == SKL_DISP_PW_2) {
 647                                 enum csr_state state;
 648                                 /* TODO: wait for a completion event or
 649                                  * similar here instead of busy
 650                                  * waiting using wait_for function.
 651                                  */
 652                                 wait_for((state = intel_csr_load_status_get(dev_priv)) !=
 653                                                 FW_UNINITIALIZED, 1000);
 654                                 if (state != FW_LOADED)
 655                                         DRM_ERROR("CSR firmware not ready (%d)\n",
 656                                                         state);
 657                                 else
 658                                         if (SKL_ENABLE_DC6(dev))
 659                                                 skl_enable_dc6(dev_priv);
 660                                         else
 661                                                 gen9_enable_dc5(dev_priv);
 662                         }
 663                 }
 664         }
 665
 666         if (check_fuse_status) {
 667                 if (power_well->data == SKL_DISP_PW_1) {
 668                         if (wait_for((I915_READ(SKL_FUSE_STATUS) &
 669                                 SKL_FUSE_PG1_DIST_STATUS), 1))
 670                                 DRM_ERROR("PG1 distributing status timeout\n");
 671                 } else if (power_well->data == SKL_DISP_PW_2) {
 672                         if (wait_for((I915_READ(SKL_FUSE_STATUS) &
 673                                 SKL_FUSE_PG2_DIST_STATUS), 1))
 674                                 DRM_ERROR("PG2 distributing status timeout\n");
 675                 }
 676         }
 677
 678         if (enable && !is_enabled)
 679                 skl_power_well_post_enable(dev_priv, power_well);
 680 }
 681
 682 static void hsw_power_well_sync_hw(struct drm_i915_private *dev_priv,
 683                                    struct i915_power_well *power_well)
 684 {
 685         hsw_set_power_well(dev_priv, power_well, power_well->count > 0);
 686
 687         /*
 688          * We're taking over the BIOS, so clear any requests made by it since
 689          * the driver is in charge now.
 690          */
 691         if (I915_READ(HSW_PWR_WELL_BIOS) & HSW_PWR_WELL_ENABLE_REQUEST)
 692                 I915_WRITE(HSW_PWR_WELL_BIOS, 0);
 693 }
 694
 695 static void hsw_power_well_enable(struct drm_i915_private *dev_priv,
 696                                   struct i915_power_well *power_well)
 697 {
 698         hsw_set_power_well(dev_priv, power_well, true);
 699 }
 700
 701 static void hsw_power_well_disable(struct drm_i915_private *dev_priv,
 702                                    struct i915_power_well *power_well)
 703 {
 704         hsw_set_power_well(dev_priv, power_well, false);
 705 }
 706
 707 static bool skl_power_well_enabled(struct drm_i915_private *dev_priv,
 708                                         struct i915_power_well *power_well)
 709 {
 710         uint32_t mask = SKL_POWER_WELL_REQ(power_well->data) |
 711                 SKL_POWER_WELL_STATE(power_well->data);
 712
 713         return (I915_READ(HSW_PWR_WELL_DRIVER) & mask) == mask;
 714 }
 715
 716 static void skl_power_well_sync_hw(struct drm_i915_private *dev_priv,
 717                                 struct i915_power_well *power_well)
 718 {
 719         skl_set_power_well(dev_priv, power_well, power_well->count > 0);
 720
 721         /* Clear any request made by BIOS as driver is taking over */
 722         I915_WRITE(HSW_PWR_WELL_BIOS, 0);
 723 }
 724
 725 static void skl_power_well_enable(struct drm_i915_private *dev_priv,
 726                                 struct i915_power_well *power_well)
 727 {
 728         skl_set_power_well(dev_priv, power_well, true);
 729 }
 730
 731 static void skl_power_well_disable(struct drm_i915_private *dev_priv,
 732                                 struct i915_power_well *power_well)
 733 {
 734         skl_set_power_well(dev_priv, power_well, false);
 735 }
 736
 737 static void i9xx_always_on_power_well_noop(struct drm_i915_private *dev_priv,
 738                                            struct i915_power_well *power_well)
 739 {
 740 }
 741
 742 static bool i9xx_always_on_power_well_enabled(struct drm_i915_private *dev_priv,
 743                                              struct i915_power_well *power_well)
 744 {
 745         return true;
 746 }
 747
 748 static void vlv_set_power_well(struct drm_i915_private *dev_priv,
 749                                struct i915_power_well *power_well, bool enable)
 750 {
 751         enum punit_power_well power_well_id = power_well->data;
 752         u32 mask;
 753         u32 state;
 754         u32 ctrl;
 755
 756         mask = PUNIT_PWRGT_MASK(power_well_id);
 757         state = enable ? PUNIT_PWRGT_PWR_ON(power_well_id) :
 758                          PUNIT_PWRGT_PWR_GATE(power_well_id);
 759
 760         mutex_lock(&dev_priv->rps.hw_lock);
 761
 762 #define COND \
 763         ((vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_STATUS) & mask) == state)
 764
 765         if (COND)
 766                 goto out;
 767
 768         ctrl = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_CTRL);
 769         ctrl &= ~mask;
 770         ctrl |= state;
 771         vlv_punit_write(dev_priv, PUNIT_REG_PWRGT_CTRL, ctrl);
 772
 773         if (wait_for(COND, 100))
 774                 DRM_ERROR("timeout setting power well state %08x (%08x)\n",
 775                           state,
 776                           vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_CTRL));
 777
 778 #undef COND
 779
 780 out:
 781         mutex_unlock(&dev_priv->rps.hw_lock);
 782 }
 783
 784 static void vlv_power_well_sync_hw(struct drm_i915_private *dev_priv,
 785                                    struct i915_power_well *power_well)
 786 {
 787         vlv_set_power_well(dev_priv, power_well, power_well->count > 0);
 788 }
 789
 790 static void vlv_power_well_enable(struct drm_i915_private *dev_priv,
 791                                   struct i915_power_well *power_well)
 792 {
 793         vlv_set_power_well(dev_priv, power_well, true);
 794 }
 795
 796 static void vlv_power_well_disable(struct drm_i915_private *dev_priv,
 797                                    struct i915_power_well *power_well)
 798 {
 799         vlv_set_power_well(dev_priv, power_well, false);
 800 }
 801
 802 static bool vlv_power_well_enabled(struct drm_i915_private *dev_priv,
 803                                    struct i915_power_well *power_well)
 804 {
 805         int power_well_id = power_well->data;
 806         bool enabled = false;
 807         u32 mask;
 808         u32 state;
 809         u32 ctrl;
 810
 811         mask = PUNIT_PWRGT_MASK(power_well_id);
 812         ctrl = PUNIT_PWRGT_PWR_ON(power_well_id);
 813
 814         mutex_lock(&dev_priv->rps.hw_lock);
 815
 816         state = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_STATUS) & mask;
 817         /*
 818          * We only ever set the power-on and power-gate states, anything
 819          * else is unexpected.
 820          */
 821         WARN_ON(state != PUNIT_PWRGT_PWR_ON(power_well_id) &&
 822                 state != PUNIT_PWRGT_PWR_GATE(power_well_id));
 823         if (state == ctrl)
 824                 enabled = true;
 825
 826         /*
 827          * A transient state at this point would mean some unexpected party
 828          * is poking at the power controls too.
 829          */
 830         ctrl = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_CTRL) & mask;
 831         WARN_ON(ctrl != state);
 832
 833         mutex_unlock(&dev_priv->rps.hw_lock);
 834
 835         return enabled;
 836 }
 837
 838 static void vlv_display_power_well_enable(struct drm_i915_private *dev_priv,
 839                                           struct i915_power_well *power_well)
 840 {
 841         WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DISP2D);
 842
 843         vlv_set_power_well(dev_priv, power_well, true);
 844
 845         spin_lock_irq(&dev_priv->irq_lock);
 846         valleyview_enable_display_irqs(dev_priv);
 847         spin_unlock_irq(&dev_priv->irq_lock);
 848
 849         /*
 850          * During driver initialization/resume we can avoid restoring the
 851          * part of the HW/SW state that will be inited anyway explicitly.
 852          */
 853         if (dev_priv->power_domains.initializing)
 854                 return;
 855
 856         intel_hpd_init(dev_priv);
 857
 858         i915_redisable_vga_power_on(dev_priv->dev);
 859 }
 860
 861 static void vlv_display_power_well_disable(struct drm_i915_private *dev_priv,
 862                                            struct i915_power_well *power_well)
 863 {
 864         WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DISP2D);
 865
 866         spin_lock_irq(&dev_priv->irq_lock);
 867         valleyview_disable_display_irqs(dev_priv);
 868         spin_unlock_irq(&dev_priv->irq_lock);
 869
 870         vlv_set_power_well(dev_priv, power_well, false);
 871
 872         vlv_power_sequencer_reset(dev_priv);
 873 }
 874
 875 static void vlv_dpio_cmn_power_well_enable(struct drm_i915_private *dev_priv,
 876                                            struct i915_power_well *power_well)
 877 {
 878         WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC);
 879
 880         /*
 881          * Enable the CRI clock source so we can get at the
 882          * display and the reference clock for VGA
 883          * hotplug / manual detection.
 884          */
 885         I915_WRITE(DPLL(PIPE_B), I915_READ(DPLL(PIPE_B)) |
 886                    DPLL_REFA_CLK_ENABLE_VLV | DPLL_INTEGRATED_CRI_CLK_VLV);
 887         udelay(1); /* >10ns for cmnreset, >0ns for sidereset */
 888
 889         vlv_set_power_well(dev_priv, power_well, true);
 890
 891         /*
 892          * From VLV2A0_DP_eDP_DPIO_driver_vbios_notes_10.docx -
 893          *  6.  De-assert cmn_reset/side_reset. Same as VLV X0.
 894          *   a. GUnit 0x2110 bit[0] set to 1 (def 0)
 895          *   b. The other bits such as sfr settings / modesel may all
 896          *      be set to 0.
 897          *
 898          * This should only be done on init and resume from S3 with
 899          * both PLLs disabled, or we risk losing DPIO and PLL
 900          * synchronization.
 901          */
 902         I915_WRITE(DPIO_CTL, I915_READ(DPIO_CTL) | DPIO_CMNRST);
 903 }
 904
 905 static void vlv_dpio_cmn_power_well_disable(struct drm_i915_private *dev_priv,
 906                                             struct i915_power_well *power_well)
 907 {
 908         enum pipe pipe;
 909
 910         WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC);
 911
 912         for_each_pipe(dev_priv, pipe)
 913                 assert_pll_disabled(dev_priv, pipe);
 914
 915         /* Assert common reset */
 916         I915_WRITE(DPIO_CTL, I915_READ(DPIO_CTL) & ~DPIO_CMNRST);
 917
 918         vlv_set_power_well(dev_priv, power_well, false);
 919 }
 920
 921 static void chv_dpio_cmn_power_well_enable(struct drm_i915_private *dev_priv,
 922                                            struct i915_power_well *power_well)
 923 {
 924         enum dpio_phy phy;
 925
 926         WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC &&
 927                      power_well->data != PUNIT_POWER_WELL_DPIO_CMN_D);
 928
 929         /*
 930          * Enable the CRI clock source so we can get at the
 931          * display and the reference clock for VGA
 932          * hotplug / manual detection.
 933          */
 934         if (power_well->data == PUNIT_POWER_WELL_DPIO_CMN_BC) {
 935                 phy = DPIO_PHY0;
 936                 I915_WRITE(DPLL(PIPE_B), I915_READ(DPLL(PIPE_B)) |
 937                            DPLL_REFA_CLK_ENABLE_VLV);
 938                 I915_WRITE(DPLL(PIPE_B), I915_READ(DPLL(PIPE_B)) |
 939                            DPLL_REFA_CLK_ENABLE_VLV | DPLL_INTEGRATED_CRI_CLK_VLV);
 940         } else {
 941                 phy = DPIO_PHY1;
 942                 I915_WRITE(DPLL(PIPE_C), I915_READ(DPLL(PIPE_C)) |
 943                            DPLL_REFA_CLK_ENABLE_VLV | DPLL_INTEGRATED_CRI_CLK_VLV);
 944         }
 945         udelay(1); /* >10ns for cmnreset, >0ns for sidereset */
 946         vlv_set_power_well(dev_priv, power_well, true);
 947
 948         /* Poll for phypwrgood signal */
 949         if (wait_for(I915_READ(DISPLAY_PHY_STATUS) & PHY_POWERGOOD(phy), 1))
 950                 DRM_ERROR("Display PHY %d is not power up\n", phy);
 951
 952         dev_priv->chv_phy_control |= PHY_COM_LANE_RESET_DEASSERT(phy);
 953         I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control);
 954 }
 955
 956 static void chv_dpio_cmn_power_well_disable(struct drm_i915_private *dev_priv,
 957                                             struct i915_power_well *power_well)
 958 {
 959         enum dpio_phy phy;
 960
 961         WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC &&
 962                      power_well->data != PUNIT_POWER_WELL_DPIO_CMN_D);
 963
 964         if (power_well->data == PUNIT_POWER_WELL_DPIO_CMN_BC) {
 965                 phy = DPIO_PHY0;
 966                 assert_pll_disabled(dev_priv, PIPE_A);
 967                 assert_pll_disabled(dev_priv, PIPE_B);
 968         } else {
 969                 phy = DPIO_PHY1;
 970                 assert_pll_disabled(dev_priv, PIPE_C);
 971         }
 972
 973         dev_priv->chv_phy_control &= ~PHY_COM_LANE_RESET_DEASSERT(phy);
 974         I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control);
 975
 976         vlv_set_power_well(dev_priv, power_well, false);
 977 }
 978
 979 static bool chv_pipe_power_well_enabled(struct drm_i915_private *dev_priv,
 980                                         struct i915_power_well *power_well)
 981 {
 982         enum pipe pipe = power_well->data;
 983         bool enabled;
 984         u32 state, ctrl;
 985
 986         mutex_lock(&dev_priv->rps.hw_lock);
 987
 988         state = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) & DP_SSS_MASK(pipe);
 989         /*
 990          * We only ever set the power-on and power-gate states, anything
 991          * else is unexpected.
 992          */
 993         WARN_ON(state != DP_SSS_PWR_ON(pipe) && state != DP_SSS_PWR_GATE(pipe));
 994         enabled = state == DP_SSS_PWR_ON(pipe);
 995
 996         /*
 997          * A transient state at this point would mean some unexpected party
 998          * is poking at the power controls too.
 999          */
1000         ctrl = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) & DP_SSC_MASK(pipe);
1001         WARN_ON(ctrl << 16 != state);
1002
1003         mutex_unlock(&dev_priv->rps.hw_lock);
1004
1005         return enabled;
1006 }
1007
1008 static void chv_set_pipe_power_well(struct drm_i915_private *dev_priv,
1009                                     struct i915_power_well *power_well,
1010                                     bool enable)
1011 {
1012         enum pipe pipe = power_well->data;
1013         u32 state;
1014         u32 ctrl;
1015
1016         state = enable ? DP_SSS_PWR_ON(pipe) : DP_SSS_PWR_GATE(pipe);
1017
1018         mutex_lock(&dev_priv->rps.hw_lock);
1019
1020 #define COND \
1021         ((vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) & DP_SSS_MASK(pipe)) == state)
1022
1023         if (COND)
1024                 goto out;
1025
1026         ctrl = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ);
1027         ctrl &= ~DP_SSC_MASK(pipe);
1028         ctrl |= enable ? DP_SSC_PWR_ON(pipe) : DP_SSC_PWR_GATE(pipe);
1029         vlv_punit_write(dev_priv, PUNIT_REG_DSPFREQ, ctrl);
1030
1031         if (wait_for(COND, 100))
1032                 DRM_ERROR("timeout setting power well state %08x (%08x)\n",
1033                           state,
1034                           vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ));
1035
1036 #undef COND
1037
1038 out:
1039         mutex_unlock(&dev_priv->rps.hw_lock);
1040 }
1041
1042 static void chv_pipe_power_well_sync_hw(struct drm_i915_private *dev_priv,
1043                                         struct i915_power_well *power_well)
1044 {
1045         chv_set_pipe_power_well(dev_priv, power_well, power_well->count > 0);
1046 }
1047
1048 static void chv_pipe_power_well_enable(struct drm_i915_private *dev_priv,
1049                                        struct i915_power_well *power_well)
1050 {
1051         WARN_ON_ONCE(power_well->data != PIPE_A &&
1052                      power_well->data != PIPE_B &&
1053                      power_well->data != PIPE_C);
1054
1055         chv_set_pipe_power_well(dev_priv, power_well, true);
1056
1057         if (power_well->data == PIPE_A) {
1058                 spin_lock_irq(&dev_priv->irq_lock);
1059                 valleyview_enable_display_irqs(dev_priv);
1060                 spin_unlock_irq(&dev_priv->irq_lock);
1061
1062                 /*
1063                  * During driver initialization/resume we can avoid restoring the
1064                  * part of the HW/SW state that will be inited anyway explicitly.
1065                  */
1066                 if (dev_priv->power_domains.initializing)
1067                         return;
1068
1069                 intel_hpd_init(dev_priv);
1070
1071                 i915_redisable_vga_power_on(dev_priv->dev);
1072         }
1073 }
1074
1075 static void chv_pipe_power_well_disable(struct drm_i915_private *dev_priv,
1076                                         struct i915_power_well *power_well)
1077 {
1078         WARN_ON_ONCE(power_well->data != PIPE_A &&
1079                      power_well->data != PIPE_B &&
1080                      power_well->data != PIPE_C);
1081
1082         if (power_well->data == PIPE_A) {
1083                 spin_lock_irq(&dev_priv->irq_lock);
1084                 valleyview_disable_display_irqs(dev_priv);
1085                 spin_unlock_irq(&dev_priv->irq_lock);
1086         }
1087
1088         chv_set_pipe_power_well(dev_priv, power_well, false);
1089
1090         if (power_well->data == PIPE_A)
1091                 vlv_power_sequencer_reset(dev_priv);
1092 }
1093
1094 /**
1095  * intel_display_power_get - grab a power domain reference
1096  * @dev_priv: i915 device instance
1097  * @domain: power domain to reference
1098  *
1099  * This function grabs a power domain reference for @domain and ensures that the
1100  * power domain and all its parents are powered up. Therefore users should only
1101  * grab a reference to the innermost power domain they need.
1102  *
1103  * Any power domain reference obtained by this function must have a symmetric
1104  * call to intel_display_power_put() to release the reference again.
1105  */
1106 void intel_display_power_get(struct drm_i915_private *dev_priv,
1107                              enum intel_display_power_domain domain)
1108 {
1109         struct i915_power_domains *power_domains;
1110         struct i915_power_well *power_well;
1111         int i;
1112
1113         intel_runtime_pm_get(dev_priv);
1114
1115         power_domains = &dev_priv->power_domains;
1116
1117         mutex_lock(&power_domains->lock);
1118
1119         for_each_power_well(i, power_well, BIT(domain), power_domains) {
1120                 if (!power_well->count++) {
1121                         DRM_DEBUG_KMS("enabling %s\n", power_well->name);
1122                         power_well->ops->enable(dev_priv, power_well);
1123                         power_well->hw_enabled = true;
1124                 }
1125         }
1126
1127         power_domains->domain_use_count[domain]++;
1128
1129         mutex_unlock(&power_domains->lock);
1130 }
1131
1132 /**
1133  * intel_display_power_put - release a power domain reference
1134  * @dev_priv: i915 device instance
1135  * @domain: power domain to reference
1136  *
1137  * This function drops the power domain reference obtained by
1138  * intel_display_power_get() and might power down the corresponding hardware
1139  * block right away if this is the last reference.
1140  */
1141 void intel_display_power_put(struct drm_i915_private *dev_priv,
1142                              enum intel_display_power_domain domain)
1143 {
1144         struct i915_power_domains *power_domains;
1145         struct i915_power_well *power_well;
1146         int i;
1147
1148         power_domains = &dev_priv->power_domains;
1149
1150         mutex_lock(&power_domains->lock);
1151
1152         WARN_ON(!power_domains->domain_use_count[domain]);
1153         power_domains->domain_use_count[domain]--;
1154
1155         for_each_power_well_rev(i, power_well, BIT(domain), power_domains) {
1156                 WARN_ON(!power_well->count);
1157
1158                 if (!--power_well->count && i915.disable_power_well) {
1159                         DRM_DEBUG_KMS("disabling %s\n", power_well->name);
1160                         power_well->hw_enabled = false;
1161                         power_well->ops->disable(dev_priv, power_well);
1162                 }
1163         }
1164
1165         mutex_unlock(&power_domains->lock);
1166
1167         intel_runtime_pm_put(dev_priv);
1168 }
1169
1170 #define POWER_DOMAIN_MASK (BIT(POWER_DOMAIN_NUM) - 1)
1171
1172 #define HSW_ALWAYS_ON_POWER_DOMAINS (                   \
1173         BIT(POWER_DOMAIN_PIPE_A) |                      \
1174         BIT(POWER_DOMAIN_TRANSCODER_EDP) |              \
1175         BIT(POWER_DOMAIN_PORT_DDI_A_2_LANES) |          \
1176         BIT(POWER_DOMAIN_PORT_DDI_A_4_LANES) |          \
1177         BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) |          \
1178         BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) |          \
1179         BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) |          \
1180         BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) |          \
1181         BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) |          \
1182         BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) |          \
1183         BIT(POWER_DOMAIN_PORT_CRT) |                    \
1184         BIT(POWER_DOMAIN_PLLS) |                        \
1185         BIT(POWER_DOMAIN_AUX_A) |                       \
1186         BIT(POWER_DOMAIN_AUX_B) |                       \
1187         BIT(POWER_DOMAIN_AUX_C) |                       \
1188         BIT(POWER_DOMAIN_AUX_D) |                       \
1189         BIT(POWER_DOMAIN_INIT))
1190 #define HSW_DISPLAY_POWER_DOMAINS (                             \
1191         (POWER_DOMAIN_MASK & ~HSW_ALWAYS_ON_POWER_DOMAINS) |    \
1192         BIT(POWER_DOMAIN_INIT))
1193
1194 #define BDW_ALWAYS_ON_POWER_DOMAINS (                   \
1195         HSW_ALWAYS_ON_POWER_DOMAINS |                   \
1196         BIT(POWER_DOMAIN_PIPE_A_PANEL_FITTER))
1197 #define BDW_DISPLAY_POWER_DOMAINS (                             \
1198         (POWER_DOMAIN_MASK & ~BDW_ALWAYS_ON_POWER_DOMAINS) |    \
1199         BIT(POWER_DOMAIN_INIT))
1200
1201 #define VLV_ALWAYS_ON_POWER_DOMAINS     BIT(POWER_DOMAIN_INIT)
1202 #define VLV_DISPLAY_POWER_DOMAINS       POWER_DOMAIN_MASK
1203
1204 #define VLV_DPIO_CMN_BC_POWER_DOMAINS (         \
1205         BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) |  \
1206         BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) |  \
1207         BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) |  \
1208         BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) |  \
1209         BIT(POWER_DOMAIN_PORT_CRT) |            \
1210         BIT(POWER_DOMAIN_AUX_B) |               \
1211         BIT(POWER_DOMAIN_AUX_C) |               \
1212         BIT(POWER_DOMAIN_INIT))
1213
1214 #define VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS (  \
1215         BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) |  \
1216         BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) |  \
1217         BIT(POWER_DOMAIN_AUX_B) |               \
1218         BIT(POWER_DOMAIN_INIT))
1219
1220 #define VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS (  \
1221         BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) |  \
1222         BIT(POWER_DOMAIN_AUX_B) |               \
1223         BIT(POWER_DOMAIN_INIT))
1224
1225 #define VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS (  \
1226         BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) |  \
1227         BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) |  \
1228         BIT(POWER_DOMAIN_AUX_C) |               \
1229         BIT(POWER_DOMAIN_INIT))
1230
1231 #define VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS (  \
1232         BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) |  \
1233         BIT(POWER_DOMAIN_AUX_C) |               \
1234         BIT(POWER_DOMAIN_INIT))
1235
1236 #define CHV_DPIO_CMN_BC_POWER_DOMAINS (         \
1237         BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) |  \
1238         BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) |  \
1239         BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) |  \
1240         BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) |  \
1241         BIT(POWER_DOMAIN_AUX_B) |               \
1242         BIT(POWER_DOMAIN_AUX_C) |               \
1243         BIT(POWER_DOMAIN_INIT))
1244
1245 #define CHV_DPIO_CMN_D_POWER_DOMAINS (          \
1246         BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) |  \
1247         BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) |  \
1248         BIT(POWER_DOMAIN_AUX_D) |               \
1249         BIT(POWER_DOMAIN_INIT))
1250
1251 static const struct i915_power_well_ops i9xx_always_on_power_well_ops = {
1252         .sync_hw = i9xx_always_on_power_well_noop,
1253         .enable = i9xx_always_on_power_well_noop,
1254         .disable = i9xx_always_on_power_well_noop,
1255         .is_enabled = i9xx_always_on_power_well_enabled,
1256 };
1257
1258 static const struct i915_power_well_ops chv_pipe_power_well_ops = {
1259         .sync_hw = chv_pipe_power_well_sync_hw,
1260         .enable = chv_pipe_power_well_enable,
1261         .disable = chv_pipe_power_well_disable,
1262         .is_enabled = chv_pipe_power_well_enabled,
1263 };
1264
1265 static const struct i915_power_well_ops chv_dpio_cmn_power_well_ops = {
1266         .sync_hw = vlv_power_well_sync_hw,
1267         .enable = chv_dpio_cmn_power_well_enable,
1268         .disable = chv_dpio_cmn_power_well_disable,
1269         .is_enabled = vlv_power_well_enabled,
1270 };
1271
1272 static struct i915_power_well i9xx_always_on_power_well[] = {
1273         {
1274                 .name = "always-on",
1275                 .always_on = 1,
1276                 .domains = POWER_DOMAIN_MASK,
1277                 .ops = &i9xx_always_on_power_well_ops,
1278         },
1279 };
1280
1281 static const struct i915_power_well_ops hsw_power_well_ops = {
1282         .sync_hw = hsw_power_well_sync_hw,
1283         .enable = hsw_power_well_enable,
1284         .disable = hsw_power_well_disable,
1285         .is_enabled = hsw_power_well_enabled,
1286 };
1287
1288 static const struct i915_power_well_ops skl_power_well_ops = {
1289         .sync_hw = skl_power_well_sync_hw,
1290         .enable = skl_power_well_enable,
1291         .disable = skl_power_well_disable,
1292         .is_enabled = skl_power_well_enabled,
1293 };
1294
1295 static struct i915_power_well hsw_power_wells[] = {
1296         {
1297                 .name = "always-on",
1298                 .always_on = 1,
1299                 .domains = HSW_ALWAYS_ON_POWER_DOMAINS,
1300                 .ops = &i9xx_always_on_power_well_ops,
1301         },
1302         {
1303                 .name = "display",
1304                 .domains = HSW_DISPLAY_POWER_DOMAINS,
1305                 .ops = &hsw_power_well_ops,
1306         },
1307 };
1308
1309 static struct i915_power_well bdw_power_wells[] = {
1310         {
1311                 .name = "always-on",
1312                 .always_on = 1,
1313                 .domains = BDW_ALWAYS_ON_POWER_DOMAINS,
1314                 .ops = &i9xx_always_on_power_well_ops,
1315         },
1316         {
1317                 .name = "display",
1318                 .domains = BDW_DISPLAY_POWER_DOMAINS,
1319                 .ops = &hsw_power_well_ops,
1320         },
1321 };
1322
1323 static const struct i915_power_well_ops vlv_display_power_well_ops = {
1324         .sync_hw = vlv_power_well_sync_hw,
1325         .enable = vlv_display_power_well_enable,
1326         .disable = vlv_display_power_well_disable,
1327         .is_enabled = vlv_power_well_enabled,
1328 };
1329
1330 static const struct i915_power_well_ops vlv_dpio_cmn_power_well_ops = {
1331         .sync_hw = vlv_power_well_sync_hw,
1332         .enable = vlv_dpio_cmn_power_well_enable,
1333         .disable = vlv_dpio_cmn_power_well_disable,
1334         .is_enabled = vlv_power_well_enabled,
1335 };
1336
1337 static const struct i915_power_well_ops vlv_dpio_power_well_ops = {
1338         .sync_hw = vlv_power_well_sync_hw,
1339         .enable = vlv_power_well_enable,
1340         .disable = vlv_power_well_disable,
1341         .is_enabled = vlv_power_well_enabled,
1342 };
1343
1344 static struct i915_power_well vlv_power_wells[] = {
1345         {
1346                 .name = "always-on",
1347                 .always_on = 1,
1348                 .domains = VLV_ALWAYS_ON_POWER_DOMAINS,
1349                 .ops = &i9xx_always_on_power_well_ops,
1350         },
1351         {
1352                 .name = "display",
1353                 .domains = VLV_DISPLAY_POWER_DOMAINS,
1354                 .data = PUNIT_POWER_WELL_DISP2D,
1355                 .ops = &vlv_display_power_well_ops,
1356         },
1357         {
1358                 .name = "dpio-tx-b-01",
1359                 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS |
1360                            VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS |
1361                            VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS |
1362                            VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
1363                 .ops = &vlv_dpio_power_well_ops,
1364                 .data = PUNIT_POWER_WELL_DPIO_TX_B_LANES_01,
1365         },
1366         {
1367                 .name = "dpio-tx-b-23",
1368                 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS |
1369                            VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS |
1370                            VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS |
1371                            VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
1372                 .ops = &vlv_dpio_power_well_ops,
1373                 .data = PUNIT_POWER_WELL_DPIO_TX_B_LANES_23,
1374         },
1375         {
1376                 .name = "dpio-tx-c-01",
1377                 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS |
1378                            VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS |
1379                            VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS |
1380                            VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
1381                 .ops = &vlv_dpio_power_well_ops,
1382                 .data = PUNIT_POWER_WELL_DPIO_TX_C_LANES_01,
1383         },
1384         {
1385                 .name = "dpio-tx-c-23",
1386                 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS |
1387                            VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS |
1388                            VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS |
1389                            VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
1390                 .ops = &vlv_dpio_power_well_ops,
1391                 .data = PUNIT_POWER_WELL_DPIO_TX_C_LANES_23,
1392         },
1393         {
1394                 .name = "dpio-common",
1395                 .domains = VLV_DPIO_CMN_BC_POWER_DOMAINS,
1396                 .data = PUNIT_POWER_WELL_DPIO_CMN_BC,
1397                 .ops = &vlv_dpio_cmn_power_well_ops,
1398         },
1399 };
1400
1401 static struct i915_power_well chv_power_wells[] = {
1402         {
1403                 .name = "always-on",
1404                 .always_on = 1,
1405                 .domains = VLV_ALWAYS_ON_POWER_DOMAINS,
1406                 .ops = &i9xx_always_on_power_well_ops,
1407         },
1408         {
1409                 .name = "display",
1410                 /*
1411                  * Pipe A power well is the new disp2d well. Pipe B and C
1412                  * power wells don't actually exist. Pipe A power well is
1413                  * required for any pipe to work.
1414                  */
1415                 .domains = VLV_DISPLAY_POWER_DOMAINS,
1416                 .data = PIPE_A,
1417                 .ops = &chv_pipe_power_well_ops,
1418         },
1419         {
1420                 .name = "dpio-common-bc",
1421                 .domains = CHV_DPIO_CMN_BC_POWER_DOMAINS,
1422                 .data = PUNIT_POWER_WELL_DPIO_CMN_BC,
1423                 .ops = &chv_dpio_cmn_power_well_ops,
1424         },
1425         {
1426                 .name = "dpio-common-d",
1427                 .domains = CHV_DPIO_CMN_D_POWER_DOMAINS,
1428                 .data = PUNIT_POWER_WELL_DPIO_CMN_D,
1429                 .ops = &chv_dpio_cmn_power_well_ops,
1430         },
1431 };
1432
1433 static struct i915_power_well *lookup_power_well(struct drm_i915_private *dev_priv,
1434                                                  int power_well_id)
1435 {
1436         struct i915_power_domains *power_domains = &dev_priv->power_domains;
1437         struct i915_power_well *power_well;
1438         int i;
1439
1440         for_each_power_well(i, power_well, POWER_DOMAIN_MASK, power_domains) {
1441                 if (power_well->data == power_well_id)
1442                         return power_well;
1443         }
1444
1445         return NULL;
1446 }
1447
1448 bool intel_display_power_well_is_enabled(struct drm_i915_private *dev_priv,
1449                                     int power_well_id)
1450 {
1451         struct i915_power_well *power_well;
1452         bool ret;
1453
1454         power_well = lookup_power_well(dev_priv, power_well_id);
1455         ret = power_well->ops->is_enabled(dev_priv, power_well);
1456
1457         return ret;
1458 }
1459
1460 static struct i915_power_well skl_power_wells[] = {
1461         {
1462                 .name = "always-on",
1463                 .always_on = 1,
1464                 .domains = SKL_DISPLAY_ALWAYS_ON_POWER_DOMAINS,
1465                 .ops = &i9xx_always_on_power_well_ops,
1466         },
1467         {
1468                 .name = "power well 1",
1469                 .domains = SKL_DISPLAY_POWERWELL_1_POWER_DOMAINS,
1470                 .ops = &skl_power_well_ops,
1471                 .data = SKL_DISP_PW_1,
1472         },
1473         {
1474                 .name = "MISC IO power well",
1475                 .domains = SKL_DISPLAY_MISC_IO_POWER_DOMAINS,
1476                 .ops = &skl_power_well_ops,
1477                 .data = SKL_DISP_PW_MISC_IO,
1478         },
1479         {
1480                 .name = "power well 2",
1481                 .domains = SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS,
1482                 .ops = &skl_power_well_ops,
1483                 .data = SKL_DISP_PW_2,
1484         },
1485         {
1486                 .name = "DDI A/E power well",
1487                 .domains = SKL_DISPLAY_DDI_A_E_POWER_DOMAINS,
1488                 .ops = &skl_power_well_ops,
1489                 .data = SKL_DISP_PW_DDI_A_E,
1490         },
1491         {
1492                 .name = "DDI B power well",
1493                 .domains = SKL_DISPLAY_DDI_B_POWER_DOMAINS,
1494                 .ops = &skl_power_well_ops,
1495                 .data = SKL_DISP_PW_DDI_B,
1496         },
1497         {
1498                 .name = "DDI C power well",
1499                 .domains = SKL_DISPLAY_DDI_C_POWER_DOMAINS,
1500                 .ops = &skl_power_well_ops,
1501                 .data = SKL_DISP_PW_DDI_C,
1502         },
1503         {
1504                 .name = "DDI D power well",
1505                 .domains = SKL_DISPLAY_DDI_D_POWER_DOMAINS,
1506                 .ops = &skl_power_well_ops,
1507                 .data = SKL_DISP_PW_DDI_D,
1508         },
1509 };
1510
1511 static struct i915_power_well bxt_power_wells[] = {
1512         {
1513                 .name = "always-on",
1514                 .always_on = 1,
1515                 .domains = BXT_DISPLAY_ALWAYS_ON_POWER_DOMAINS,
1516                 .ops = &i9xx_always_on_power_well_ops,
1517         },
1518         {
1519                 .name = "power well 1",
1520                 .domains = BXT_DISPLAY_POWERWELL_1_POWER_DOMAINS,
1521                 .ops = &skl_power_well_ops,
1522                 .data = SKL_DISP_PW_1,
1523         },
1524         {
1525                 .name = "power well 2",
1526                 .domains = BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS,
1527                 .ops = &skl_power_well_ops,
1528                 .data = SKL_DISP_PW_2,
1529         }
1530 };
1531
1532 #define set_power_wells(power_domains, __power_wells) ({                \
1533         (power_domains)->power_wells = (__power_wells);                 \
1534         (power_domains)->power_well_count = ARRAY_SIZE(__power_wells);  \
1535 })
1536
1537 /**
1538  * intel_power_domains_init - initializes the power domain structures
1539  * @dev_priv: i915 device instance
1540  *
1541  * Initializes the power domain structures for @dev_priv depending upon the
1542  * supported platform.
1543  */
1544 int intel_power_domains_init(struct drm_i915_private *dev_priv)
1545 {
1546         struct i915_power_domains *power_domains = &dev_priv->power_domains;
1547
1548         mutex_init(&power_domains->lock);
1549
1550         /*
1551          * The enabling order will be from lower to higher indexed wells,
1552          * the disabling order is reversed.
1553          */
1554         if (IS_HASWELL(dev_priv->dev)) {
1555                 set_power_wells(power_domains, hsw_power_wells);
1556         } else if (IS_BROADWELL(dev_priv->dev)) {
1557                 set_power_wells(power_domains, bdw_power_wells);
1558         } else if (IS_SKYLAKE(dev_priv->dev)) {
1559                 set_power_wells(power_domains, skl_power_wells);
1560         } else if (IS_BROXTON(dev_priv->dev)) {
1561                 set_power_wells(power_domains, bxt_power_wells);
1562         } else if (IS_CHERRYVIEW(dev_priv->dev)) {
1563                 set_power_wells(power_domains, chv_power_wells);
1564         } else if (IS_VALLEYVIEW(dev_priv->dev)) {
1565                 set_power_wells(power_domains, vlv_power_wells);
1566         } else {
1567                 set_power_wells(power_domains, i9xx_always_on_power_well);
1568         }
1569
1570         return 0;
1571 }
1572
1573 static void intel_runtime_pm_disable(struct drm_i915_private *dev_priv)
1574 {
1575         struct drm_device *dev = dev_priv->dev;
1576         struct device *device = &dev->pdev->dev;
1577
1578         if (!HAS_RUNTIME_PM(dev))
1579                 return;
1580
1581         if (!intel_enable_rc6(dev))
1582                 return;
1583
1584         /* Make sure we're not suspended first. */
1585         pm_runtime_get_sync(device);
1586         pm_runtime_disable(device);
1587 }
1588
1589 /**
1590  * intel_power_domains_fini - finalizes the power domain structures
1591  * @dev_priv: i915 device instance
1592  *
1593  * Finalizes the power domain structures for @dev_priv depending upon the
1594  * supported platform. This function also disables runtime pm and ensures that
1595  * the device stays powered up so that the driver can be reloaded.
1596  */
1597 void intel_power_domains_fini(struct drm_i915_private *dev_priv)
1598 {
1599         intel_runtime_pm_disable(dev_priv);
1600
1601         /* The i915.ko module is still not prepared to be loaded when
1602          * the power well is not enabled, so just enable it in case
1603          * we're going to unload/reload. */
1604         intel_display_set_init_power(dev_priv, true);
1605 }
1606
1607 static void intel_power_domains_resume(struct drm_i915_private *dev_priv)
1608 {
1609         struct i915_power_domains *power_domains = &dev_priv->power_domains;
1610         struct i915_power_well *power_well;
1611         int i;
1612
1613         mutex_lock(&power_domains->lock);
1614         for_each_power_well(i, power_well, POWER_DOMAIN_MASK, power_domains) {
1615                 power_well->ops->sync_hw(dev_priv, power_well);
1616                 power_well->hw_enabled = power_well->ops->is_enabled(dev_priv,
1617                                                                      power_well);
1618         }
1619         mutex_unlock(&power_domains->lock);
1620 }
1621
1622 static void chv_phy_control_init(struct drm_i915_private *dev_priv)
1623 {
1624         struct i915_power_well *cmn_bc =
1625                 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_BC);
1626         struct i915_power_well *cmn_d =
1627                 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_D);
1628
1629         /*
1630          * DISPLAY_PHY_CONTROL can get corrupted if read. As a
1631          * workaround never ever read DISPLAY_PHY_CONTROL, and
1632          * instead maintain a shadow copy ourselves. Use the actual
1633          * power well state to reconstruct the expected initial
1634          * value.
1635          */
1636         dev_priv->chv_phy_control =
1637                 PHY_LDO_SEQ_DELAY(PHY_LDO_DELAY_600NS, DPIO_PHY0) |
1638                 PHY_LDO_SEQ_DELAY(PHY_LDO_DELAY_600NS, DPIO_PHY1) |
1639                 PHY_CH_POWER_MODE(PHY_CH_SU_PSR, DPIO_PHY0, DPIO_CH0) |
1640                 PHY_CH_POWER_MODE(PHY_CH_SU_PSR, DPIO_PHY0, DPIO_CH1) |
1641                 PHY_CH_POWER_MODE(PHY_CH_SU_PSR, DPIO_PHY1, DPIO_CH0);
1642         if (cmn_bc->ops->is_enabled(dev_priv, cmn_bc))
1643                 dev_priv->chv_phy_control |= PHY_COM_LANE_RESET_DEASSERT(DPIO_PHY0);
1644         if (cmn_d->ops->is_enabled(dev_priv, cmn_d))
1645                 dev_priv->chv_phy_control |= PHY_COM_LANE_RESET_DEASSERT(DPIO_PHY1);
1646 }
1647
1648 static void vlv_cmnlane_wa(struct drm_i915_private *dev_priv)
1649 {
1650         struct i915_power_well *cmn =
1651                 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_BC);
1652         struct i915_power_well *disp2d =
1653                 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DISP2D);
1654
1655         /* If the display might be already active skip this */
1656         if (cmn->ops->is_enabled(dev_priv, cmn) &&
1657             disp2d->ops->is_enabled(dev_priv, disp2d) &&
1658             I915_READ(DPIO_CTL) & DPIO_CMNRST)
1659                 return;
1660
1661         DRM_DEBUG_KMS("toggling display PHY side reset\n");
1662
1663         /* cmnlane needs DPLL registers */
1664         disp2d->ops->enable(dev_priv, disp2d);
1665
1666         /*
1667          * From VLV2A0_DP_eDP_HDMI_DPIO_driver_vbios_notes_11.docx:
1668          * Need to assert and de-assert PHY SB reset by gating the
1669          * common lane power, then un-gating it.
1670          * Simply ungating isn't enough to reset the PHY enough to get
1671          * ports and lanes running.
1672          */
1673         cmn->ops->disable(dev_priv, cmn);
1674 }
1675
1676 /**
1677  * intel_power_domains_init_hw - initialize hardware power domain state
1678  * @dev_priv: i915 device instance
1679  *
1680  * This function initializes the hardware power domain state and enables all
1681  * power domains using intel_display_set_init_power().
1682  */
1683 void intel_power_domains_init_hw(struct drm_i915_private *dev_priv)
1684 {
1685         struct drm_device *dev = dev_priv->dev;
1686         struct i915_power_domains *power_domains = &dev_priv->power_domains;
1687
1688         power_domains->initializing = true;
1689
1690         if (IS_CHERRYVIEW(dev)) {
1691                 chv_phy_control_init(dev_priv);
1692         } else if (IS_VALLEYVIEW(dev)) {
1693                 mutex_lock(&power_domains->lock);
1694                 vlv_cmnlane_wa(dev_priv);
1695                 mutex_unlock(&power_domains->lock);
1696         }
1697
1698         /* For now, we need the power well to be always enabled. */
1699         intel_display_set_init_power(dev_priv, true);
1700         intel_power_domains_resume(dev_priv);
1701         power_domains->initializing = false;
1702 }
1703
1704 /**
1705  * intel_aux_display_runtime_get - grab an auxiliary power domain reference
1706  * @dev_priv: i915 device instance
1707  *
1708  * This function grabs a power domain reference for the auxiliary power domain
1709  * (for access to the GMBUS and DP AUX blocks) and ensures that it and all its
1710  * parents are powered up. Therefore users should only grab a reference to the
1711  * innermost power domain they need.
1712  *
1713  * Any power domain reference obtained by this function must have a symmetric
1714  * call to intel_aux_display_runtime_put() to release the reference again.
1715  */
1716 void intel_aux_display_runtime_get(struct drm_i915_private *dev_priv)
1717 {
1718         intel_runtime_pm_get(dev_priv);
1719 }
1720
1721 /**
1722  * intel_aux_display_runtime_put - release an auxiliary power domain reference
1723  * @dev_priv: i915 device instance
1724  *
1725  * This function drops the auxiliary power domain reference obtained by
1726  * intel_aux_display_runtime_get() and might power down the corresponding
1727  * hardware block right away if this is the last reference.
1728  */
1729 void intel_aux_display_runtime_put(struct drm_i915_private *dev_priv)
1730 {
1731         intel_runtime_pm_put(dev_priv);
1732 }
1733
1734 /**
1735  * intel_runtime_pm_get - grab a runtime pm reference
1736  * @dev_priv: i915 device instance
1737  *
1738  * This function grabs a device-level runtime pm reference (mostly used for GEM
1739  * code to ensure the GTT or GT is on) and ensures that it is powered up.
1740  *
1741  * Any runtime pm reference obtained by this function must have a symmetric
1742  * call to intel_runtime_pm_put() to release the reference again.
1743  */
1744 void intel_runtime_pm_get(struct drm_i915_private *dev_priv)
1745 {
1746         struct drm_device *dev = dev_priv->dev;
1747         struct device *device = &dev->pdev->dev;
1748
1749         if (!HAS_RUNTIME_PM(dev))
1750                 return;
1751
1752         pm_runtime_get_sync(device);
1753         WARN(dev_priv->pm.suspended, "Device still suspended.\n");
1754 }
1755
1756 /**
1757  * intel_runtime_pm_get_noresume - grab a runtime pm reference
1758  * @dev_priv: i915 device instance
1759  *
1760  * This function grabs a device-level runtime pm reference (mostly used for GEM
1761  * code to ensure the GTT or GT is on).
1762  *
1763  * It will _not_ power up the device but instead only check that it's powered
1764  * on.  Therefore it is only valid to call this functions from contexts where
1765  * the device is known to be powered up and where trying to power it up would
1766  * result in hilarity and deadlocks. That pretty much means only the system
1767  * suspend/resume code where this is used to grab runtime pm references for
1768  * delayed setup down in work items.
1769  *
1770  * Any runtime pm reference obtained by this function must have a symmetric
1771  * call to intel_runtime_pm_put() to release the reference again.
1772  */
1773 void intel_runtime_pm_get_noresume(struct drm_i915_private *dev_priv)
1774 {
1775         struct drm_device *dev = dev_priv->dev;
1776         struct device *device = &dev->pdev->dev;
1777
1778         if (!HAS_RUNTIME_PM(dev))
1779                 return;
1780
1781         WARN(dev_priv->pm.suspended, "Getting nosync-ref while suspended.\n");
1782         pm_runtime_get_noresume(device);
1783 }
1784
1785 /**
1786  * intel_runtime_pm_put - release a runtime pm reference
1787  * @dev_priv: i915 device instance
1788  *
1789  * This function drops the device-level runtime pm reference obtained by
1790  * intel_runtime_pm_get() and might power down the corresponding
1791  * hardware block right away if this is the last reference.
1792  */
1793 void intel_runtime_pm_put(struct drm_i915_private *dev_priv)
1794 {
1795         struct drm_device *dev = dev_priv->dev;
1796         struct device *device = &dev->pdev->dev;
1797
1798         if (!HAS_RUNTIME_PM(dev))
1799                 return;
1800
1801         pm_runtime_mark_last_busy(device);
1802         pm_runtime_put_autosuspend(device);
1803 }
1804
1805 /**
1806  * intel_runtime_pm_enable - enable runtime pm
1807  * @dev_priv: i915 device instance
1808  *
1809  * This function enables runtime pm at the end of the driver load sequence.
1810  *
1811  * Note that this function does currently not enable runtime pm for the
1812  * subordinate display power domains. That is only done on the first modeset
1813  * using intel_display_set_init_power().
1814  */
1815 void intel_runtime_pm_enable(struct drm_i915_private *dev_priv)
1816 {
1817         struct drm_device *dev = dev_priv->dev;
1818         struct device *device = &dev->pdev->dev;
1819
1820         if (!HAS_RUNTIME_PM(dev))
1821                 return;
1822
1823         pm_runtime_set_active(device);
1824
1825         /*
1826          * RPM depends on RC6 to save restore the GT HW context, so make RC6 a
1827          * requirement.
1828          */
1829         if (!intel_enable_rc6(dev)) {
1830                 DRM_INFO("RC6 disabled, disabling runtime PM support\n");
1831                 return;
1832         }
1833
1834         pm_runtime_set_autosuspend_delay(device, 10000); /* 10s */
1835         pm_runtime_mark_last_busy(device);
1836         pm_runtime_use_autosuspend(device);
1837
1838         pm_runtime_put_autosuspend(device);
1839 }
1840