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 static void intel_power_well_enable(struct drm_i915_private *dev_priv,
  72                                     struct i915_power_well *power_well)
  73 {
  74         DRM_DEBUG_KMS("enabling %s\n", power_well->name);
  75         power_well->ops->enable(dev_priv, power_well);
  76         power_well->hw_enabled = true;
  77 }
  78
  79 static void intel_power_well_disable(struct drm_i915_private *dev_priv,
  80                                      struct i915_power_well *power_well)
  81 {
  82         DRM_DEBUG_KMS("disabling %s\n", power_well->name);
  83         power_well->hw_enabled = false;
  84         power_well->ops->disable(dev_priv, power_well);
  85 }
  86
  87 /*
  88  * We should only use the power well if we explicitly asked the hardware to
  89  * enable it, so check if it's enabled and also check if we've requested it to
  90  * be enabled.
  91  */
  92 static bool hsw_power_well_enabled(struct drm_i915_private *dev_priv,
  93                                    struct i915_power_well *power_well)
  94 {
  95         return I915_READ(HSW_PWR_WELL_DRIVER) ==
  96                      (HSW_PWR_WELL_ENABLE_REQUEST | HSW_PWR_WELL_STATE_ENABLED);
  97 }
  98
  99 /**
 100  * __intel_display_power_is_enabled - unlocked check for a power domain
 101  * @dev_priv: i915 device instance
 102  * @domain: power domain to check
 103  *
 104  * This is the unlocked version of intel_display_power_is_enabled() and should
 105  * only be used from error capture and recovery code where deadlocks are
 106  * possible.
 107  *
 108  * Returns:
 109  * True when the power domain is enabled, false otherwise.
 110  */
 111 bool __intel_display_power_is_enabled(struct drm_i915_private *dev_priv,
 112                                       enum intel_display_power_domain domain)
 113 {
 114         struct i915_power_domains *power_domains;
 115         struct i915_power_well *power_well;
 116         bool is_enabled;
 117         int i;
 118
 119         if (dev_priv->pm.suspended)
 120                 return false;
 121
 122         power_domains = &dev_priv->power_domains;
 123
 124         is_enabled = true;
 125
 126         for_each_power_well_rev(i, power_well, BIT(domain), power_domains) {
 127                 if (power_well->always_on)
 128                         continue;
 129
 130                 if (!power_well->hw_enabled) {
 131                         is_enabled = false;
 132                         break;
 133                 }
 134         }
 135
 136         return is_enabled;
 137 }
 138
 139 /**
 140  * intel_display_power_is_enabled - check for a power domain
 141  * @dev_priv: i915 device instance
 142  * @domain: power domain to check
 143  *
 144  * This function can be used to check the hw power domain state. It is mostly
 145  * used in hardware state readout functions. Everywhere else code should rely
 146  * upon explicit power domain reference counting to ensure that the hardware
 147  * block is powered up before accessing it.
 148  *
 149  * Callers must hold the relevant modesetting locks to ensure that concurrent
 150  * threads can't disable the power well while the caller tries to read a few
 151  * registers.
 152  *
 153  * Returns:
 154  * True when the power domain is enabled, false otherwise.
 155  */
 156 bool intel_display_power_is_enabled(struct drm_i915_private *dev_priv,
 157                                     enum intel_display_power_domain domain)
 158 {
 159         struct i915_power_domains *power_domains;
 160         bool ret;
 161
 162         power_domains = &dev_priv->power_domains;
 163
 164         mutex_lock(&power_domains->lock);
 165         ret = __intel_display_power_is_enabled(dev_priv, domain);
 166         mutex_unlock(&power_domains->lock);
 167
 168         return ret;
 169 }
 170
 171 /**
 172  * intel_display_set_init_power - set the initial power domain state
 173  * @dev_priv: i915 device instance
 174  * @enable: whether to enable or disable the initial power domain state
 175  *
 176  * For simplicity our driver load/unload and system suspend/resume code assumes
 177  * that all power domains are always enabled. This functions controls the state
 178  * of this little hack. While the initial power domain state is enabled runtime
 179  * pm is effectively disabled.
 180  */
 181 void intel_display_set_init_power(struct drm_i915_private *dev_priv,
 182                                   bool enable)
 183 {
 184         if (dev_priv->power_domains.init_power_on == enable)
 185                 return;
 186
 187         if (enable)
 188                 intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);
 189         else
 190                 intel_display_power_put(dev_priv, POWER_DOMAIN_INIT);
 191
 192         dev_priv->power_domains.init_power_on = enable;
 193 }
 194
 195 /*
 196  * Starting with Haswell, we have a "Power Down Well" that can be turned off
 197  * when not needed anymore. We have 4 registers that can request the power well
 198  * to be enabled, and it will only be disabled if none of the registers is
 199  * requesting it to be enabled.
 200  */
 201 static void hsw_power_well_post_enable(struct drm_i915_private *dev_priv)
 202 {
 203         struct drm_device *dev = dev_priv->dev;
 204
 205         /*
 206          * After we re-enable the power well, if we touch VGA register 0x3d5
 207          * we'll get unclaimed register interrupts. This stops after we write
 208          * anything to the VGA MSR register. The vgacon module uses this
 209          * register all the time, so if we unbind our driver and, as a
 210          * consequence, bind vgacon, we'll get stuck in an infinite loop at
 211          * console_unlock(). So make here we touch the VGA MSR register, making
 212          * sure vgacon can keep working normally without triggering interrupts
 213          * and error messages.
 214          */
 215         vga_get_uninterruptible(dev->pdev, VGA_RSRC_LEGACY_IO);
 216         outb(inb(VGA_MSR_READ), VGA_MSR_WRITE);
 217         vga_put(dev->pdev, VGA_RSRC_LEGACY_IO);
 218
 219         if (IS_BROADWELL(dev))
 220                 gen8_irq_power_well_post_enable(dev_priv,
 221                                                 1 << PIPE_C | 1 << PIPE_B);
 222 }
 223
 224 static void skl_power_well_post_enable(struct drm_i915_private *dev_priv,
 225                                        struct i915_power_well *power_well)
 226 {
 227         struct drm_device *dev = dev_priv->dev;
 228
 229         /*
 230          * After we re-enable the power well, if we touch VGA register 0x3d5
 231          * we'll get unclaimed register interrupts. This stops after we write
 232          * anything to the VGA MSR register. The vgacon module uses this
 233          * register all the time, so if we unbind our driver and, as a
 234          * consequence, bind vgacon, we'll get stuck in an infinite loop at
 235          * console_unlock(). So make here we touch the VGA MSR register, making
 236          * sure vgacon can keep working normally without triggering interrupts
 237          * and error messages.
 238          */
 239         if (power_well->data == SKL_DISP_PW_2) {
 240                 vga_get_uninterruptible(dev->pdev, VGA_RSRC_LEGACY_IO);
 241                 outb(inb(VGA_MSR_READ), VGA_MSR_WRITE);
 242                 vga_put(dev->pdev, VGA_RSRC_LEGACY_IO);
 243
 244                 gen8_irq_power_well_post_enable(dev_priv,
 245                                                 1 << PIPE_C | 1 << PIPE_B);
 246         }
 247
 248         if (power_well->data == SKL_DISP_PW_1) {
 249                 if (!dev_priv->power_domains.initializing)
 250                         intel_prepare_ddi(dev);
 251                 gen8_irq_power_well_post_enable(dev_priv, 1 << PIPE_A);
 252         }
 253 }
 254
 255 static void hsw_set_power_well(struct drm_i915_private *dev_priv,
 256                                struct i915_power_well *power_well, bool enable)
 257 {
 258         bool is_enabled, enable_requested;
 259         uint32_t tmp;
 260
 261         tmp = I915_READ(HSW_PWR_WELL_DRIVER);
 262         is_enabled = tmp & HSW_PWR_WELL_STATE_ENABLED;
 263         enable_requested = tmp & HSW_PWR_WELL_ENABLE_REQUEST;
 264
 265         if (enable) {
 266                 if (!enable_requested)
 267                         I915_WRITE(HSW_PWR_WELL_DRIVER,
 268                                    HSW_PWR_WELL_ENABLE_REQUEST);
 269
 270                 if (!is_enabled) {
 271                         DRM_DEBUG_KMS("Enabling power well\n");
 272                         if (wait_for((I915_READ(HSW_PWR_WELL_DRIVER) &
 273                                       HSW_PWR_WELL_STATE_ENABLED), 20))
 274                                 DRM_ERROR("Timeout enabling power well\n");
 275                         hsw_power_well_post_enable(dev_priv);
 276                 }
 277
 278         } else {
 279                 if (enable_requested) {
 280                         I915_WRITE(HSW_PWR_WELL_DRIVER, 0);
 281                         POSTING_READ(HSW_PWR_WELL_DRIVER);
 282                         DRM_DEBUG_KMS("Requesting to disable the power well\n");
 283                 }
 284         }
 285 }
 286
 287 #define SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS (         \
 288         BIT(POWER_DOMAIN_TRANSCODER_A) |                \
 289         BIT(POWER_DOMAIN_PIPE_B) |                      \
 290         BIT(POWER_DOMAIN_TRANSCODER_B) |                \
 291         BIT(POWER_DOMAIN_PIPE_C) |                      \
 292         BIT(POWER_DOMAIN_TRANSCODER_C) |                \
 293         BIT(POWER_DOMAIN_PIPE_B_PANEL_FITTER) |         \
 294         BIT(POWER_DOMAIN_PIPE_C_PANEL_FITTER) |         \
 295         BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) |          \
 296         BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) |          \
 297         BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) |          \
 298         BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) |          \
 299         BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) |          \
 300         BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) |          \
 301         BIT(POWER_DOMAIN_PORT_DDI_E_2_LANES) |          \
 302         BIT(POWER_DOMAIN_AUX_B) |                       \
 303         BIT(POWER_DOMAIN_AUX_C) |                       \
 304         BIT(POWER_DOMAIN_AUX_D) |                       \
 305         BIT(POWER_DOMAIN_AUDIO) |                       \
 306         BIT(POWER_DOMAIN_VGA) |                         \
 307         BIT(POWER_DOMAIN_INIT))
 308 #define SKL_DISPLAY_POWERWELL_1_POWER_DOMAINS (         \
 309         SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS |         \
 310         BIT(POWER_DOMAIN_PLLS) |                        \
 311         BIT(POWER_DOMAIN_PIPE_A) |                      \
 312         BIT(POWER_DOMAIN_TRANSCODER_EDP) |              \
 313         BIT(POWER_DOMAIN_PIPE_A_PANEL_FITTER) |         \
 314         BIT(POWER_DOMAIN_PORT_DDI_A_2_LANES) |          \
 315         BIT(POWER_DOMAIN_PORT_DDI_A_4_LANES) |          \
 316         BIT(POWER_DOMAIN_AUX_A) |                       \
 317         BIT(POWER_DOMAIN_INIT))
 318 #define SKL_DISPLAY_DDI_A_E_POWER_DOMAINS (             \
 319         BIT(POWER_DOMAIN_PORT_DDI_A_2_LANES) |          \
 320         BIT(POWER_DOMAIN_PORT_DDI_A_4_LANES) |          \
 321         BIT(POWER_DOMAIN_PORT_DDI_E_2_LANES) |          \
 322         BIT(POWER_DOMAIN_INIT))
 323 #define SKL_DISPLAY_DDI_B_POWER_DOMAINS (               \
 324         BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) |          \
 325         BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) |          \
 326         BIT(POWER_DOMAIN_INIT))
 327 #define SKL_DISPLAY_DDI_C_POWER_DOMAINS (               \
 328         BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) |          \
 329         BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) |          \
 330         BIT(POWER_DOMAIN_INIT))
 331 #define SKL_DISPLAY_DDI_D_POWER_DOMAINS (               \
 332         BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) |          \
 333         BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) |          \
 334         BIT(POWER_DOMAIN_INIT))
 335 #define SKL_DISPLAY_MISC_IO_POWER_DOMAINS (             \
 336         SKL_DISPLAY_POWERWELL_1_POWER_DOMAINS |         \
 337         BIT(POWER_DOMAIN_PLLS) |                        \
 338         BIT(POWER_DOMAIN_INIT))
 339 #define SKL_DISPLAY_ALWAYS_ON_POWER_DOMAINS (           \
 340         (POWER_DOMAIN_MASK & ~(SKL_DISPLAY_POWERWELL_1_POWER_DOMAINS |  \
 341         SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS |         \
 342         SKL_DISPLAY_DDI_A_E_POWER_DOMAINS |             \
 343         SKL_DISPLAY_DDI_B_POWER_DOMAINS |               \
 344         SKL_DISPLAY_DDI_C_POWER_DOMAINS |               \
 345         SKL_DISPLAY_DDI_D_POWER_DOMAINS |               \
 346         SKL_DISPLAY_MISC_IO_POWER_DOMAINS)) |           \
 347         BIT(POWER_DOMAIN_INIT))
 348
 349 #define BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS (         \
 350         BIT(POWER_DOMAIN_TRANSCODER_A) |                \
 351         BIT(POWER_DOMAIN_PIPE_B) |                      \
 352         BIT(POWER_DOMAIN_TRANSCODER_B) |                \
 353         BIT(POWER_DOMAIN_PIPE_C) |                      \
 354         BIT(POWER_DOMAIN_TRANSCODER_C) |                \
 355         BIT(POWER_DOMAIN_PIPE_B_PANEL_FITTER) |         \
 356         BIT(POWER_DOMAIN_PIPE_C_PANEL_FITTER) |         \
 357         BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) |          \
 358         BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) |          \
 359         BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) |          \
 360         BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) |          \
 361         BIT(POWER_DOMAIN_AUX_B) |                       \
 362         BIT(POWER_DOMAIN_AUX_C) |                       \
 363         BIT(POWER_DOMAIN_AUDIO) |                       \
 364         BIT(POWER_DOMAIN_VGA) |                         \
 365         BIT(POWER_DOMAIN_INIT))
 366 #define BXT_DISPLAY_POWERWELL_1_POWER_DOMAINS (         \
 367         BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS |         \
 368         BIT(POWER_DOMAIN_PIPE_A) |                      \
 369         BIT(POWER_DOMAIN_TRANSCODER_EDP) |              \
 370         BIT(POWER_DOMAIN_PIPE_A_PANEL_FITTER) |         \
 371         BIT(POWER_DOMAIN_PORT_DDI_A_2_LANES) |          \
 372         BIT(POWER_DOMAIN_PORT_DDI_A_4_LANES) |          \
 373         BIT(POWER_DOMAIN_AUX_A) |                       \
 374         BIT(POWER_DOMAIN_PLLS) |                        \
 375         BIT(POWER_DOMAIN_INIT))
 376 #define BXT_DISPLAY_ALWAYS_ON_POWER_DOMAINS (           \
 377         (POWER_DOMAIN_MASK & ~(BXT_DISPLAY_POWERWELL_1_POWER_DOMAINS |  \
 378         BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS)) |       \
 379         BIT(POWER_DOMAIN_INIT))
 380
 381 static void assert_can_enable_dc9(struct drm_i915_private *dev_priv)
 382 {
 383         struct drm_device *dev = dev_priv->dev;
 384
 385         WARN(!IS_BROXTON(dev), "Platform doesn't support DC9.\n");
 386         WARN((I915_READ(DC_STATE_EN) & DC_STATE_EN_DC9),
 387                 "DC9 already programmed to be enabled.\n");
 388         WARN(I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5,
 389                 "DC5 still not disabled to enable DC9.\n");
 390         WARN(I915_READ(HSW_PWR_WELL_DRIVER), "Power well on.\n");
 391         WARN(intel_irqs_enabled(dev_priv), "Interrupts not disabled yet.\n");
 392
 393          /*
 394           * TODO: check for the following to verify the conditions to enter DC9
 395           * state are satisfied:
 396           * 1] Check relevant display engine registers to verify if mode set
 397           * disable sequence was followed.
 398           * 2] Check if display uninitialize sequence is initialized.
 399           */
 400 }
 401
 402 static void assert_can_disable_dc9(struct drm_i915_private *dev_priv)
 403 {
 404         WARN(intel_irqs_enabled(dev_priv), "Interrupts not disabled yet.\n");
 405         WARN(!(I915_READ(DC_STATE_EN) & DC_STATE_EN_DC9),
 406                 "DC9 already programmed to be disabled.\n");
 407         WARN(I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5,
 408                 "DC5 still not disabled.\n");
 409
 410          /*
 411           * TODO: check for the following to verify DC9 state was indeed
 412           * entered before programming to disable it:
 413           * 1] Check relevant display engine registers to verify if mode
 414           *  set disable sequence was followed.
 415           * 2] Check if display uninitialize sequence is initialized.
 416           */
 417 }
 418
 419 void bxt_enable_dc9(struct drm_i915_private *dev_priv)
 420 {
 421         uint32_t val;
 422
 423         assert_can_enable_dc9(dev_priv);
 424
 425         DRM_DEBUG_KMS("Enabling DC9\n");
 426
 427         val = I915_READ(DC_STATE_EN);
 428         val |= DC_STATE_EN_DC9;
 429         I915_WRITE(DC_STATE_EN, val);
 430         POSTING_READ(DC_STATE_EN);
 431 }
 432
 433 void bxt_disable_dc9(struct drm_i915_private *dev_priv)
 434 {
 435         uint32_t val;
 436
 437         assert_can_disable_dc9(dev_priv);
 438
 439         DRM_DEBUG_KMS("Disabling DC9\n");
 440
 441         val = I915_READ(DC_STATE_EN);
 442         val &= ~DC_STATE_EN_DC9;
 443         I915_WRITE(DC_STATE_EN, val);
 444         POSTING_READ(DC_STATE_EN);
 445 }
 446
 447 static void gen9_set_dc_state_debugmask_memory_up(
 448                         struct drm_i915_private *dev_priv)
 449 {
 450         uint32_t val;
 451
 452         /* The below bit doesn't need to be cleared ever afterwards */
 453         val = I915_READ(DC_STATE_DEBUG);
 454         if (!(val & DC_STATE_DEBUG_MASK_MEMORY_UP)) {
 455                 val |= DC_STATE_DEBUG_MASK_MEMORY_UP;
 456                 I915_WRITE(DC_STATE_DEBUG, val);
 457                 POSTING_READ(DC_STATE_DEBUG);
 458         }
 459 }
 460
 461 static void assert_can_enable_dc5(struct drm_i915_private *dev_priv)
 462 {
 463         struct drm_device *dev = dev_priv->dev;
 464         bool pg2_enabled = intel_display_power_well_is_enabled(dev_priv,
 465                                         SKL_DISP_PW_2);
 466
 467         WARN(!IS_SKYLAKE(dev), "Platform doesn't support DC5.\n");
 468         WARN(!HAS_RUNTIME_PM(dev), "Runtime PM not enabled.\n");
 469         WARN(pg2_enabled, "PG2 not disabled to enable DC5.\n");
 470
 471         WARN((I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5),
 472                                 "DC5 already programmed to be enabled.\n");
 473         WARN(dev_priv->pm.suspended,
 474                 "DC5 cannot be enabled, if platform is runtime-suspended.\n");
 475
 476         assert_csr_loaded(dev_priv);
 477 }
 478
 479 static void assert_can_disable_dc5(struct drm_i915_private *dev_priv)
 480 {
 481         bool pg2_enabled = intel_display_power_well_is_enabled(dev_priv,
 482                                         SKL_DISP_PW_2);
 483         /*
 484          * During initialization, the firmware may not be loaded yet.
 485          * We still want to make sure that the DC enabling flag is cleared.
 486          */
 487         if (dev_priv->power_domains.initializing)
 488                 return;
 489
 490         WARN(!pg2_enabled, "PG2 not enabled to disable DC5.\n");
 491         WARN(dev_priv->pm.suspended,
 492                 "Disabling of DC5 while platform is runtime-suspended should never happen.\n");
 493 }
 494
 495 static void gen9_enable_dc5(struct drm_i915_private *dev_priv)
 496 {
 497         uint32_t val;
 498
 499         assert_can_enable_dc5(dev_priv);
 500
 501         DRM_DEBUG_KMS("Enabling DC5\n");
 502
 503         gen9_set_dc_state_debugmask_memory_up(dev_priv);
 504
 505         val = I915_READ(DC_STATE_EN);
 506         val &= ~DC_STATE_EN_UPTO_DC5_DC6_MASK;
 507         val |= DC_STATE_EN_UPTO_DC5;
 508         I915_WRITE(DC_STATE_EN, val);
 509         POSTING_READ(DC_STATE_EN);
 510 }
 511
 512 static void gen9_disable_dc5(struct drm_i915_private *dev_priv)
 513 {
 514         uint32_t val;
 515
 516         assert_can_disable_dc5(dev_priv);
 517
 518         DRM_DEBUG_KMS("Disabling DC5\n");
 519
 520         val = I915_READ(DC_STATE_EN);
 521         val &= ~DC_STATE_EN_UPTO_DC5;
 522         I915_WRITE(DC_STATE_EN, val);
 523         POSTING_READ(DC_STATE_EN);
 524 }
 525
 526 static void assert_can_enable_dc6(struct drm_i915_private *dev_priv)
 527 {
 528         struct drm_device *dev = dev_priv->dev;
 529
 530         WARN(!IS_SKYLAKE(dev), "Platform doesn't support DC6.\n");
 531         WARN(!HAS_RUNTIME_PM(dev), "Runtime PM not enabled.\n");
 532         WARN(I915_READ(UTIL_PIN_CTL) & UTIL_PIN_ENABLE,
 533                 "Backlight is not disabled.\n");
 534         WARN((I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC6),
 535                 "DC6 already programmed to be enabled.\n");
 536
 537         assert_csr_loaded(dev_priv);
 538 }
 539
 540 static void assert_can_disable_dc6(struct drm_i915_private *dev_priv)
 541 {
 542         /*
 543          * During initialization, the firmware may not be loaded yet.
 544          * We still want to make sure that the DC enabling flag is cleared.
 545          */
 546         if (dev_priv->power_domains.initializing)
 547                 return;
 548
 549         assert_csr_loaded(dev_priv);
 550         WARN(!(I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC6),
 551                 "DC6 already programmed to be disabled.\n");
 552 }
 553
 554 static void skl_enable_dc6(struct drm_i915_private *dev_priv)
 555 {
 556         uint32_t val;
 557
 558         assert_can_enable_dc6(dev_priv);
 559
 560         DRM_DEBUG_KMS("Enabling DC6\n");
 561
 562         gen9_set_dc_state_debugmask_memory_up(dev_priv);
 563
 564         val = I915_READ(DC_STATE_EN);
 565         val &= ~DC_STATE_EN_UPTO_DC5_DC6_MASK;
 566         val |= DC_STATE_EN_UPTO_DC6;
 567         I915_WRITE(DC_STATE_EN, val);
 568         POSTING_READ(DC_STATE_EN);
 569 }
 570
 571 static void skl_disable_dc6(struct drm_i915_private *dev_priv)
 572 {
 573         uint32_t val;
 574
 575         assert_can_disable_dc6(dev_priv);
 576
 577         DRM_DEBUG_KMS("Disabling DC6\n");
 578
 579         val = I915_READ(DC_STATE_EN);
 580         val &= ~DC_STATE_EN_UPTO_DC6;
 581         I915_WRITE(DC_STATE_EN, val);
 582         POSTING_READ(DC_STATE_EN);
 583 }
 584
 585 static void skl_set_power_well(struct drm_i915_private *dev_priv,
 586                         struct i915_power_well *power_well, bool enable)
 587 {
 588         struct drm_device *dev = dev_priv->dev;
 589         uint32_t tmp, fuse_status;
 590         uint32_t req_mask, state_mask;
 591         bool is_enabled, enable_requested, check_fuse_status = false;
 592
 593         tmp = I915_READ(HSW_PWR_WELL_DRIVER);
 594         fuse_status = I915_READ(SKL_FUSE_STATUS);
 595
 596         switch (power_well->data) {
 597         case SKL_DISP_PW_1:
 598                 if (wait_for((I915_READ(SKL_FUSE_STATUS) &
 599                         SKL_FUSE_PG0_DIST_STATUS), 1)) {
 600                         DRM_ERROR("PG0 not enabled\n");
 601                         return;
 602                 }
 603                 break;
 604         case SKL_DISP_PW_2:
 605                 if (!(fuse_status & SKL_FUSE_PG1_DIST_STATUS)) {
 606                         DRM_ERROR("PG1 in disabled state\n");
 607                         return;
 608                 }
 609                 break;
 610         case SKL_DISP_PW_DDI_A_E:
 611         case SKL_DISP_PW_DDI_B:
 612         case SKL_DISP_PW_DDI_C:
 613         case SKL_DISP_PW_DDI_D:
 614         case SKL_DISP_PW_MISC_IO:
 615                 break;
 616         default:
 617                 WARN(1, "Unknown power well %lu\n", power_well->data);
 618                 return;
 619         }
 620
 621         req_mask = SKL_POWER_WELL_REQ(power_well->data);
 622         enable_requested = tmp & req_mask;
 623         state_mask = SKL_POWER_WELL_STATE(power_well->data);
 624         is_enabled = tmp & state_mask;
 625
 626         if (enable) {
 627                 if (!enable_requested) {
 628                         WARN((tmp & state_mask) &&
 629                                 !I915_READ(HSW_PWR_WELL_BIOS),
 630                                 "Invalid for power well status to be enabled, unless done by the BIOS, \
 631                                 when request is to disable!\n");
 632                         if ((GEN9_ENABLE_DC5(dev) || SKL_ENABLE_DC6(dev)) &&
 633                                 power_well->data == SKL_DISP_PW_2) {
 634                                 if (SKL_ENABLE_DC6(dev)) {
 635                                         skl_disable_dc6(dev_priv);
 636                                         /*
 637                                          * DDI buffer programming unnecessary during driver-load/resume
 638                                          * as it's already done during modeset initialization then.
 639                                          * It's also invalid here as encoder list is still uninitialized.
 640                                          */
 641                                         if (!dev_priv->power_domains.initializing)
 642                                                 intel_prepare_ddi(dev);
 643                                 } else {
 644                                         gen9_disable_dc5(dev_priv);
 645                                 }
 646                         }
 647                         I915_WRITE(HSW_PWR_WELL_DRIVER, tmp | req_mask);
 648                 }
 649
 650                 if (!is_enabled) {
 651                         DRM_DEBUG_KMS("Enabling %s\n", power_well->name);
 652                         if (wait_for((I915_READ(HSW_PWR_WELL_DRIVER) &
 653                                 state_mask), 1))
 654                                 DRM_ERROR("%s enable timeout\n",
 655                                         power_well->name);
 656                         check_fuse_status = true;
 657                 }
 658         } else {
 659                 if (enable_requested) {
 660                         I915_WRITE(HSW_PWR_WELL_DRIVER, tmp & ~req_mask);
 661                         POSTING_READ(HSW_PWR_WELL_DRIVER);
 662                         DRM_DEBUG_KMS("Disabling %s\n", power_well->name);
 663
 664                         if ((GEN9_ENABLE_DC5(dev) || SKL_ENABLE_DC6(dev)) &&
 665                                 power_well->data == SKL_DISP_PW_2) {
 666                                 enum csr_state state;
 667                                 /* TODO: wait for a completion event or
 668                                  * similar here instead of busy
 669                                  * waiting using wait_for function.
 670                                  */
 671                                 wait_for((state = intel_csr_load_status_get(dev_priv)) !=
 672                                                 FW_UNINITIALIZED, 1000);
 673                                 if (state != FW_LOADED)
 674                                         DRM_ERROR("CSR firmware not ready (%d)\n",
 675                                                         state);
 676                                 else
 677                                         if (SKL_ENABLE_DC6(dev))
 678                                                 skl_enable_dc6(dev_priv);
 679                                         else
 680                                                 gen9_enable_dc5(dev_priv);
 681                         }
 682                 }
 683         }
 684
 685         if (check_fuse_status) {
 686                 if (power_well->data == SKL_DISP_PW_1) {
 687                         if (wait_for((I915_READ(SKL_FUSE_STATUS) &
 688                                 SKL_FUSE_PG1_DIST_STATUS), 1))
 689                                 DRM_ERROR("PG1 distributing status timeout\n");
 690                 } else if (power_well->data == SKL_DISP_PW_2) {
 691                         if (wait_for((I915_READ(SKL_FUSE_STATUS) &
 692                                 SKL_FUSE_PG2_DIST_STATUS), 1))
 693                                 DRM_ERROR("PG2 distributing status timeout\n");
 694                 }
 695         }
 696
 697         if (enable && !is_enabled)
 698                 skl_power_well_post_enable(dev_priv, power_well);
 699 }
 700
 701 static void hsw_power_well_sync_hw(struct drm_i915_private *dev_priv,
 702                                    struct i915_power_well *power_well)
 703 {
 704         hsw_set_power_well(dev_priv, power_well, power_well->count > 0);
 705
 706         /*
 707          * We're taking over the BIOS, so clear any requests made by it since
 708          * the driver is in charge now.
 709          */
 710         if (I915_READ(HSW_PWR_WELL_BIOS) & HSW_PWR_WELL_ENABLE_REQUEST)
 711                 I915_WRITE(HSW_PWR_WELL_BIOS, 0);
 712 }
 713
 714 static void hsw_power_well_enable(struct drm_i915_private *dev_priv,
 715                                   struct i915_power_well *power_well)
 716 {
 717         hsw_set_power_well(dev_priv, power_well, true);
 718 }
 719
 720 static void hsw_power_well_disable(struct drm_i915_private *dev_priv,
 721                                    struct i915_power_well *power_well)
 722 {
 723         hsw_set_power_well(dev_priv, power_well, false);
 724 }
 725
 726 static bool skl_power_well_enabled(struct drm_i915_private *dev_priv,
 727                                         struct i915_power_well *power_well)
 728 {
 729         uint32_t mask = SKL_POWER_WELL_REQ(power_well->data) |
 730                 SKL_POWER_WELL_STATE(power_well->data);
 731
 732         return (I915_READ(HSW_PWR_WELL_DRIVER) & mask) == mask;
 733 }
 734
 735 static void skl_power_well_sync_hw(struct drm_i915_private *dev_priv,
 736                                 struct i915_power_well *power_well)
 737 {
 738         skl_set_power_well(dev_priv, power_well, power_well->count > 0);
 739
 740         /* Clear any request made by BIOS as driver is taking over */
 741         I915_WRITE(HSW_PWR_WELL_BIOS, 0);
 742 }
 743
 744 static void skl_power_well_enable(struct drm_i915_private *dev_priv,
 745                                 struct i915_power_well *power_well)
 746 {
 747         skl_set_power_well(dev_priv, power_well, true);
 748 }
 749
 750 static void skl_power_well_disable(struct drm_i915_private *dev_priv,
 751                                 struct i915_power_well *power_well)
 752 {
 753         skl_set_power_well(dev_priv, power_well, false);
 754 }
 755
 756 static void i9xx_always_on_power_well_noop(struct drm_i915_private *dev_priv,
 757                                            struct i915_power_well *power_well)
 758 {
 759 }
 760
 761 static bool i9xx_always_on_power_well_enabled(struct drm_i915_private *dev_priv,
 762                                              struct i915_power_well *power_well)
 763 {
 764         return true;
 765 }
 766
 767 static void vlv_set_power_well(struct drm_i915_private *dev_priv,
 768                                struct i915_power_well *power_well, bool enable)
 769 {
 770         enum punit_power_well power_well_id = power_well->data;
 771         u32 mask;
 772         u32 state;
 773         u32 ctrl;
 774
 775         mask = PUNIT_PWRGT_MASK(power_well_id);
 776         state = enable ? PUNIT_PWRGT_PWR_ON(power_well_id) :
 777                          PUNIT_PWRGT_PWR_GATE(power_well_id);
 778
 779         mutex_lock(&dev_priv->rps.hw_lock);
 780
 781 #define COND \
 782         ((vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_STATUS) & mask) == state)
 783
 784         if (COND)
 785                 goto out;
 786
 787         ctrl = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_CTRL);
 788         ctrl &= ~mask;
 789         ctrl |= state;
 790         vlv_punit_write(dev_priv, PUNIT_REG_PWRGT_CTRL, ctrl);
 791
 792         if (wait_for(COND, 100))
 793                 DRM_ERROR("timeout setting power well state %08x (%08x)\n",
 794                           state,
 795                           vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_CTRL));
 796
 797 #undef COND
 798
 799 out:
 800         mutex_unlock(&dev_priv->rps.hw_lock);
 801 }
 802
 803 static void vlv_power_well_sync_hw(struct drm_i915_private *dev_priv,
 804                                    struct i915_power_well *power_well)
 805 {
 806         vlv_set_power_well(dev_priv, power_well, power_well->count > 0);
 807 }
 808
 809 static void vlv_power_well_enable(struct drm_i915_private *dev_priv,
 810                                   struct i915_power_well *power_well)
 811 {
 812         vlv_set_power_well(dev_priv, power_well, true);
 813 }
 814
 815 static void vlv_power_well_disable(struct drm_i915_private *dev_priv,
 816                                    struct i915_power_well *power_well)
 817 {
 818         vlv_set_power_well(dev_priv, power_well, false);
 819 }
 820
 821 static bool vlv_power_well_enabled(struct drm_i915_private *dev_priv,
 822                                    struct i915_power_well *power_well)
 823 {
 824         int power_well_id = power_well->data;
 825         bool enabled = false;
 826         u32 mask;
 827         u32 state;
 828         u32 ctrl;
 829
 830         mask = PUNIT_PWRGT_MASK(power_well_id);
 831         ctrl = PUNIT_PWRGT_PWR_ON(power_well_id);
 832
 833         mutex_lock(&dev_priv->rps.hw_lock);
 834
 835         state = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_STATUS) & mask;
 836         /*
 837          * We only ever set the power-on and power-gate states, anything
 838          * else is unexpected.
 839          */
 840         WARN_ON(state != PUNIT_PWRGT_PWR_ON(power_well_id) &&
 841                 state != PUNIT_PWRGT_PWR_GATE(power_well_id));
 842         if (state == ctrl)
 843                 enabled = true;
 844
 845         /*
 846          * A transient state at this point would mean some unexpected party
 847          * is poking at the power controls too.
 848          */
 849         ctrl = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_CTRL) & mask;
 850         WARN_ON(ctrl != state);
 851
 852         mutex_unlock(&dev_priv->rps.hw_lock);
 853
 854         return enabled;
 855 }
 856
 857 static void vlv_display_power_well_init(struct drm_i915_private *dev_priv)
 858 {
 859
 860         spin_lock_irq(&dev_priv->irq_lock);
 861         valleyview_enable_display_irqs(dev_priv);
 862         spin_unlock_irq(&dev_priv->irq_lock);
 863
 864         /*
 865          * During driver initialization/resume we can avoid restoring the
 866          * part of the HW/SW state that will be inited anyway explicitly.
 867          */
 868         if (dev_priv->power_domains.initializing)
 869                 return;
 870
 871         intel_hpd_init(dev_priv);
 872
 873         i915_redisable_vga_power_on(dev_priv->dev);
 874 }
 875
 876 static void vlv_display_power_well_deinit(struct drm_i915_private *dev_priv)
 877 {
 878         spin_lock_irq(&dev_priv->irq_lock);
 879         valleyview_disable_display_irqs(dev_priv);
 880         spin_unlock_irq(&dev_priv->irq_lock);
 881
 882         vlv_power_sequencer_reset(dev_priv);
 883 }
 884
 885 static void vlv_display_power_well_enable(struct drm_i915_private *dev_priv,
 886                                           struct i915_power_well *power_well)
 887 {
 888         WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DISP2D);
 889
 890         vlv_set_power_well(dev_priv, power_well, true);
 891
 892         vlv_display_power_well_init(dev_priv);
 893 }
 894
 895 static void vlv_display_power_well_disable(struct drm_i915_private *dev_priv,
 896                                            struct i915_power_well *power_well)
 897 {
 898         WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DISP2D);
 899
 900         vlv_display_power_well_deinit(dev_priv);
 901
 902         vlv_set_power_well(dev_priv, power_well, false);
 903 }
 904
 905 static void vlv_dpio_cmn_power_well_enable(struct drm_i915_private *dev_priv,
 906                                            struct i915_power_well *power_well)
 907 {
 908         WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC);
 909
 910         /*
 911          * Enable the CRI clock source so we can get at the
 912          * display and the reference clock for VGA
 913          * hotplug / manual detection.
 914          */
 915         I915_WRITE(DPLL(PIPE_B), I915_READ(DPLL(PIPE_B)) | DPLL_VGA_MODE_DIS |
 916                    DPLL_REF_CLK_ENABLE_VLV | DPLL_INTEGRATED_CRI_CLK_VLV);
 917         udelay(1); /* >10ns for cmnreset, >0ns for sidereset */
 918
 919         vlv_set_power_well(dev_priv, power_well, true);
 920
 921         /*
 922          * From VLV2A0_DP_eDP_DPIO_driver_vbios_notes_10.docx -
 923          *  6.  De-assert cmn_reset/side_reset. Same as VLV X0.
 924          *   a. GUnit 0x2110 bit[0] set to 1 (def 0)
 925          *   b. The other bits such as sfr settings / modesel may all
 926          *      be set to 0.
 927          *
 928          * This should only be done on init and resume from S3 with
 929          * both PLLs disabled, or we risk losing DPIO and PLL
 930          * synchronization.
 931          */
 932         I915_WRITE(DPIO_CTL, I915_READ(DPIO_CTL) | DPIO_CMNRST);
 933 }
 934
 935 static void vlv_dpio_cmn_power_well_disable(struct drm_i915_private *dev_priv,
 936                                             struct i915_power_well *power_well)
 937 {
 938         enum pipe pipe;
 939
 940         WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC);
 941
 942         for_each_pipe(dev_priv, pipe)
 943                 assert_pll_disabled(dev_priv, pipe);
 944
 945         /* Assert common reset */
 946         I915_WRITE(DPIO_CTL, I915_READ(DPIO_CTL) & ~DPIO_CMNRST);
 947
 948         vlv_set_power_well(dev_priv, power_well, false);
 949 }
 950
 951 static void chv_dpio_cmn_power_well_enable(struct drm_i915_private *dev_priv,
 952                                            struct i915_power_well *power_well)
 953 {
 954         enum dpio_phy phy;
 955
 956         WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC &&
 957                      power_well->data != PUNIT_POWER_WELL_DPIO_CMN_D);
 958
 959         /*
 960          * Enable the CRI clock source so we can get at the
 961          * display and the reference clock for VGA
 962          * hotplug / manual detection.
 963          */
 964         if (power_well->data == PUNIT_POWER_WELL_DPIO_CMN_BC) {
 965                 phy = DPIO_PHY0;
 966                 I915_WRITE(DPLL(PIPE_B), I915_READ(DPLL(PIPE_B)) | DPLL_VGA_MODE_DIS |
 967                            DPLL_REF_CLK_ENABLE_VLV);
 968                 I915_WRITE(DPLL(PIPE_B), I915_READ(DPLL(PIPE_B)) | DPLL_VGA_MODE_DIS |
 969                            DPLL_REF_CLK_ENABLE_VLV | DPLL_INTEGRATED_CRI_CLK_VLV);
 970         } else {
 971                 phy = DPIO_PHY1;
 972                 I915_WRITE(DPLL(PIPE_C), I915_READ(DPLL(PIPE_C)) | DPLL_VGA_MODE_DIS |
 973                            DPLL_REF_CLK_ENABLE_VLV | DPLL_INTEGRATED_CRI_CLK_VLV);
 974         }
 975         udelay(1); /* >10ns for cmnreset, >0ns for sidereset */
 976         vlv_set_power_well(dev_priv, power_well, true);
 977
 978         /* Poll for phypwrgood signal */
 979         if (wait_for(I915_READ(DISPLAY_PHY_STATUS) & PHY_POWERGOOD(phy), 1))
 980                 DRM_ERROR("Display PHY %d is not power up\n", phy);
 981
 982         dev_priv->chv_phy_control |= PHY_COM_LANE_RESET_DEASSERT(phy);
 983         I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control);
 984 }
 985
 986 static void chv_dpio_cmn_power_well_disable(struct drm_i915_private *dev_priv,
 987                                             struct i915_power_well *power_well)
 988 {
 989         enum dpio_phy phy;
 990
 991         WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC &&
 992                      power_well->data != PUNIT_POWER_WELL_DPIO_CMN_D);
 993
 994         if (power_well->data == PUNIT_POWER_WELL_DPIO_CMN_BC) {
 995                 phy = DPIO_PHY0;
 996                 assert_pll_disabled(dev_priv, PIPE_A);
 997                 assert_pll_disabled(dev_priv, PIPE_B);
 998         } else {
 999                 phy = DPIO_PHY1;
1000                 assert_pll_disabled(dev_priv, PIPE_C);
1001         }
1002
1003         dev_priv->chv_phy_control &= ~PHY_COM_LANE_RESET_DEASSERT(phy);
1004         I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control);
1005
1006         vlv_set_power_well(dev_priv, power_well, false);
1007 }
1008
1009 static bool chv_pipe_power_well_enabled(struct drm_i915_private *dev_priv,
1010                                         struct i915_power_well *power_well)
1011 {
1012         enum pipe pipe = power_well->data;
1013         bool enabled;
1014         u32 state, ctrl;
1015
1016         mutex_lock(&dev_priv->rps.hw_lock);
1017
1018         state = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) & DP_SSS_MASK(pipe);
1019         /*
1020          * We only ever set the power-on and power-gate states, anything
1021          * else is unexpected.
1022          */
1023         WARN_ON(state != DP_SSS_PWR_ON(pipe) && state != DP_SSS_PWR_GATE(pipe));
1024         enabled = state == DP_SSS_PWR_ON(pipe);
1025
1026         /*
1027          * A transient state at this point would mean some unexpected party
1028          * is poking at the power controls too.
1029          */
1030         ctrl = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) & DP_SSC_MASK(pipe);
1031         WARN_ON(ctrl << 16 != state);
1032
1033         mutex_unlock(&dev_priv->rps.hw_lock);
1034
1035         return enabled;
1036 }
1037
1038 static void chv_set_pipe_power_well(struct drm_i915_private *dev_priv,
1039                                     struct i915_power_well *power_well,
1040                                     bool enable)
1041 {
1042         enum pipe pipe = power_well->data;
1043         u32 state;
1044         u32 ctrl;
1045
1046         state = enable ? DP_SSS_PWR_ON(pipe) : DP_SSS_PWR_GATE(pipe);
1047
1048         mutex_lock(&dev_priv->rps.hw_lock);
1049
1050 #define COND \
1051         ((vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) & DP_SSS_MASK(pipe)) == state)
1052
1053         if (COND)
1054                 goto out;
1055
1056         ctrl = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ);
1057         ctrl &= ~DP_SSC_MASK(pipe);
1058         ctrl |= enable ? DP_SSC_PWR_ON(pipe) : DP_SSC_PWR_GATE(pipe);
1059         vlv_punit_write(dev_priv, PUNIT_REG_DSPFREQ, ctrl);
1060
1061         if (wait_for(COND, 100))
1062                 DRM_ERROR("timeout setting power well state %08x (%08x)\n",
1063                           state,
1064                           vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ));
1065
1066 #undef COND
1067
1068 out:
1069         mutex_unlock(&dev_priv->rps.hw_lock);
1070 }
1071
1072 static void chv_pipe_power_well_sync_hw(struct drm_i915_private *dev_priv,
1073                                         struct i915_power_well *power_well)
1074 {
1075         WARN_ON_ONCE(power_well->data != PIPE_A);
1076
1077         chv_set_pipe_power_well(dev_priv, power_well, power_well->count > 0);
1078 }
1079
1080 static void chv_pipe_power_well_enable(struct drm_i915_private *dev_priv,
1081                                        struct i915_power_well *power_well)
1082 {
1083         WARN_ON_ONCE(power_well->data != PIPE_A);
1084
1085         chv_set_pipe_power_well(dev_priv, power_well, true);
1086
1087         vlv_display_power_well_init(dev_priv);
1088 }
1089
1090 static void chv_pipe_power_well_disable(struct drm_i915_private *dev_priv,
1091                                         struct i915_power_well *power_well)
1092 {
1093         WARN_ON_ONCE(power_well->data != PIPE_A);
1094
1095         vlv_display_power_well_deinit(dev_priv);
1096
1097         chv_set_pipe_power_well(dev_priv, power_well, false);
1098 }
1099
1100 /**
1101  * intel_display_power_get - grab a power domain reference
1102  * @dev_priv: i915 device instance
1103  * @domain: power domain to reference
1104  *
1105  * This function grabs a power domain reference for @domain and ensures that the
1106  * power domain and all its parents are powered up. Therefore users should only
1107  * grab a reference to the innermost power domain they need.
1108  *
1109  * Any power domain reference obtained by this function must have a symmetric
1110  * call to intel_display_power_put() to release the reference again.
1111  */
1112 void intel_display_power_get(struct drm_i915_private *dev_priv,
1113                              enum intel_display_power_domain domain)
1114 {
1115         struct i915_power_domains *power_domains;
1116         struct i915_power_well *power_well;
1117         int i;
1118
1119         intel_runtime_pm_get(dev_priv);
1120
1121         power_domains = &dev_priv->power_domains;
1122
1123         mutex_lock(&power_domains->lock);
1124
1125         for_each_power_well(i, power_well, BIT(domain), power_domains) {
1126                 if (!power_well->count++)
1127                         intel_power_well_enable(dev_priv, power_well);
1128         }
1129
1130         power_domains->domain_use_count[domain]++;
1131
1132         mutex_unlock(&power_domains->lock);
1133 }
1134
1135 /**
1136  * intel_display_power_put - release a power domain reference
1137  * @dev_priv: i915 device instance
1138  * @domain: power domain to reference
1139  *
1140  * This function drops the power domain reference obtained by
1141  * intel_display_power_get() and might power down the corresponding hardware
1142  * block right away if this is the last reference.
1143  */
1144 void intel_display_power_put(struct drm_i915_private *dev_priv,
1145                              enum intel_display_power_domain domain)
1146 {
1147         struct i915_power_domains *power_domains;
1148         struct i915_power_well *power_well;
1149         int i;
1150
1151         power_domains = &dev_priv->power_domains;
1152
1153         mutex_lock(&power_domains->lock);
1154
1155         WARN_ON(!power_domains->domain_use_count[domain]);
1156         power_domains->domain_use_count[domain]--;
1157
1158         for_each_power_well_rev(i, power_well, BIT(domain), power_domains) {
1159                 WARN_ON(!power_well->count);
1160
1161                 if (!--power_well->count && i915.disable_power_well)
1162                         intel_power_well_disable(dev_priv, power_well);
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