2 * Copyright © 2012-2014 Intel Corporation
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:
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
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
24 * Eugeni Dodonov <eugeni.dodonov@intel.com>
25 * Daniel Vetter <daniel.vetter@ffwll.ch>
29 #include <linux/pm_runtime.h>
30 #include <linux/vgaarb.h>
33 #include "intel_drv.h"
34 #include <drm/i915_powerwell.h>
39 * The i915 driver supports dynamic enabling and disabling of entire hardware
40 * blocks at runtime. This is especially important on the display side where
41 * software is supposed to control many power gates manually on recent hardware,
42 * since on the GT side a lot of the power management is done by the hardware.
43 * But even there some manual control at the device level is required.
45 * Since i915 supports a diverse set of platforms with a unified codebase and
46 * hardware engineers just love to shuffle functionality around between power
47 * domains there's a sizeable amount of indirection required. This file provides
48 * generic functions to the driver for grabbing and releasing references for
49 * abstract power domains. It then maps those to the actual power wells
50 * present for a given platform.
53 static struct i915_power_domains *hsw_pwr;
55 #define for_each_power_well(i, power_well, domain_mask, power_domains) \
57 i < (power_domains)->power_well_count && \
58 ((power_well) = &(power_domains)->power_wells[i]); \
60 if ((power_well)->domains & (domain_mask))
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]);\
66 if ((power_well)->domains & (domain_mask))
69 * We should only use the power well if we explicitly asked the hardware to
70 * enable it, so check if it's enabled and also check if we've requested it to
73 static bool hsw_power_well_enabled(struct drm_i915_private *dev_priv,
74 struct i915_power_well *power_well)
76 return I915_READ(HSW_PWR_WELL_DRIVER) ==
77 (HSW_PWR_WELL_ENABLE_REQUEST | HSW_PWR_WELL_STATE_ENABLED);
81 * __intel_display_power_is_enabled - unlocked check for a power domain
82 * @dev_priv: i915 device instance
83 * @domain: power domain to check
85 * This is the unlocked version of intel_display_power_is_enabled() and should
86 * only be used from error capture and recovery code where deadlocks are
90 * True when the power domain is enabled, false otherwise.
92 bool __intel_display_power_is_enabled(struct drm_i915_private *dev_priv,
93 enum intel_display_power_domain domain)
95 struct i915_power_domains *power_domains;
96 struct i915_power_well *power_well;
100 if (dev_priv->pm.suspended)
103 power_domains = &dev_priv->power_domains;
107 for_each_power_well_rev(i, power_well, BIT(domain), power_domains) {
108 if (power_well->always_on)
111 if (!power_well->hw_enabled) {
121 * intel_display_power_is_enabled - unlocked check for a power domain
122 * @dev_priv: i915 device instance
123 * @domain: power domain to check
125 * This function can be used to check the hw power domain state. It is mostly
126 * used in hardware state readout functions. Everywhere else code should rely
127 * upon explicit power domain reference counting to ensure that the hardware
128 * block is powered up before accessing it.
130 * Callers must hold the relevant modesetting locks to ensure that concurrent
131 * threads can't disable the power well while the caller tries to read a few
135 * True when the power domain is enabled, false otherwise.
137 bool intel_display_power_is_enabled(struct drm_i915_private *dev_priv,
138 enum intel_display_power_domain domain)
140 struct i915_power_domains *power_domains;
143 power_domains = &dev_priv->power_domains;
145 mutex_lock(&power_domains->lock);
146 ret = __intel_display_power_is_enabled(dev_priv, domain);
147 mutex_unlock(&power_domains->lock);
153 * intel_display_set_init_power - set the initial power domain state
154 * @dev_priv: i915 device instance
155 * @enable: whether to enable or disable the initial power domain state
157 * For simplicity our driver load/unload and system suspend/resume code assumes
158 * that all power domains are always enabled. This functions controls the state
159 * of this little hack. While the initial power domain state is enabled runtime
160 * pm is effectively disabled.
162 void intel_display_set_init_power(struct drm_i915_private *dev_priv,
165 if (dev_priv->power_domains.init_power_on == enable)
169 intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);
171 intel_display_power_put(dev_priv, POWER_DOMAIN_INIT);
173 dev_priv->power_domains.init_power_on = enable;
177 * Starting with Haswell, we have a "Power Down Well" that can be turned off
178 * when not needed anymore. We have 4 registers that can request the power well
179 * to be enabled, and it will only be disabled if none of the registers is
180 * requesting it to be enabled.
182 static void hsw_power_well_post_enable(struct drm_i915_private *dev_priv)
184 struct drm_device *dev = dev_priv->dev;
187 * After we re-enable the power well, if we touch VGA register 0x3d5
188 * we'll get unclaimed register interrupts. This stops after we write
189 * anything to the VGA MSR register. The vgacon module uses this
190 * register all the time, so if we unbind our driver and, as a
191 * consequence, bind vgacon, we'll get stuck in an infinite loop at
192 * console_unlock(). So make here we touch the VGA MSR register, making
193 * sure vgacon can keep working normally without triggering interrupts
194 * and error messages.
196 vga_get_uninterruptible(dev->pdev, VGA_RSRC_LEGACY_IO);
197 outb(inb(VGA_MSR_READ), VGA_MSR_WRITE);
198 vga_put(dev->pdev, VGA_RSRC_LEGACY_IO);
200 if (IS_BROADWELL(dev) || (INTEL_INFO(dev)->gen >= 9))
201 gen8_irq_power_well_post_enable(dev_priv);
204 static void hsw_set_power_well(struct drm_i915_private *dev_priv,
205 struct i915_power_well *power_well, bool enable)
207 bool is_enabled, enable_requested;
210 tmp = I915_READ(HSW_PWR_WELL_DRIVER);
211 is_enabled = tmp & HSW_PWR_WELL_STATE_ENABLED;
212 enable_requested = tmp & HSW_PWR_WELL_ENABLE_REQUEST;
215 if (!enable_requested)
216 I915_WRITE(HSW_PWR_WELL_DRIVER,
217 HSW_PWR_WELL_ENABLE_REQUEST);
220 DRM_DEBUG_KMS("Enabling power well\n");
221 if (wait_for((I915_READ(HSW_PWR_WELL_DRIVER) &
222 HSW_PWR_WELL_STATE_ENABLED), 20))
223 DRM_ERROR("Timeout enabling power well\n");
224 hsw_power_well_post_enable(dev_priv);
228 if (enable_requested) {
229 I915_WRITE(HSW_PWR_WELL_DRIVER, 0);
230 POSTING_READ(HSW_PWR_WELL_DRIVER);
231 DRM_DEBUG_KMS("Requesting to disable the power well\n");
236 static void hsw_power_well_sync_hw(struct drm_i915_private *dev_priv,
237 struct i915_power_well *power_well)
239 hsw_set_power_well(dev_priv, power_well, power_well->count > 0);
242 * We're taking over the BIOS, so clear any requests made by it since
243 * the driver is in charge now.
245 if (I915_READ(HSW_PWR_WELL_BIOS) & HSW_PWR_WELL_ENABLE_REQUEST)
246 I915_WRITE(HSW_PWR_WELL_BIOS, 0);
249 static void hsw_power_well_enable(struct drm_i915_private *dev_priv,
250 struct i915_power_well *power_well)
252 hsw_set_power_well(dev_priv, power_well, true);
255 static void hsw_power_well_disable(struct drm_i915_private *dev_priv,
256 struct i915_power_well *power_well)
258 hsw_set_power_well(dev_priv, power_well, false);
261 static void i9xx_always_on_power_well_noop(struct drm_i915_private *dev_priv,
262 struct i915_power_well *power_well)
266 static bool i9xx_always_on_power_well_enabled(struct drm_i915_private *dev_priv,
267 struct i915_power_well *power_well)
272 static void vlv_set_power_well(struct drm_i915_private *dev_priv,
273 struct i915_power_well *power_well, bool enable)
275 enum punit_power_well power_well_id = power_well->data;
280 mask = PUNIT_PWRGT_MASK(power_well_id);
281 state = enable ? PUNIT_PWRGT_PWR_ON(power_well_id) :
282 PUNIT_PWRGT_PWR_GATE(power_well_id);
284 mutex_lock(&dev_priv->rps.hw_lock);
287 ((vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_STATUS) & mask) == state)
292 ctrl = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_CTRL);
295 vlv_punit_write(dev_priv, PUNIT_REG_PWRGT_CTRL, ctrl);
297 if (wait_for(COND, 100))
298 DRM_ERROR("timout setting power well state %08x (%08x)\n",
300 vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_CTRL));
305 mutex_unlock(&dev_priv->rps.hw_lock);
308 static void vlv_power_well_sync_hw(struct drm_i915_private *dev_priv,
309 struct i915_power_well *power_well)
311 vlv_set_power_well(dev_priv, power_well, power_well->count > 0);
314 static void vlv_power_well_enable(struct drm_i915_private *dev_priv,
315 struct i915_power_well *power_well)
317 vlv_set_power_well(dev_priv, power_well, true);
320 static void vlv_power_well_disable(struct drm_i915_private *dev_priv,
321 struct i915_power_well *power_well)
323 vlv_set_power_well(dev_priv, power_well, false);
326 static bool vlv_power_well_enabled(struct drm_i915_private *dev_priv,
327 struct i915_power_well *power_well)
329 int power_well_id = power_well->data;
330 bool enabled = false;
335 mask = PUNIT_PWRGT_MASK(power_well_id);
336 ctrl = PUNIT_PWRGT_PWR_ON(power_well_id);
338 mutex_lock(&dev_priv->rps.hw_lock);
340 state = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_STATUS) & mask;
342 * We only ever set the power-on and power-gate states, anything
343 * else is unexpected.
345 WARN_ON(state != PUNIT_PWRGT_PWR_ON(power_well_id) &&
346 state != PUNIT_PWRGT_PWR_GATE(power_well_id));
351 * A transient state at this point would mean some unexpected party
352 * is poking at the power controls too.
354 ctrl = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_CTRL) & mask;
355 WARN_ON(ctrl != state);
357 mutex_unlock(&dev_priv->rps.hw_lock);
362 static void vlv_display_power_well_enable(struct drm_i915_private *dev_priv,
363 struct i915_power_well *power_well)
365 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DISP2D);
367 vlv_set_power_well(dev_priv, power_well, true);
369 spin_lock_irq(&dev_priv->irq_lock);
370 valleyview_enable_display_irqs(dev_priv);
371 spin_unlock_irq(&dev_priv->irq_lock);
374 * During driver initialization/resume we can avoid restoring the
375 * part of the HW/SW state that will be inited anyway explicitly.
377 if (dev_priv->power_domains.initializing)
380 intel_hpd_init(dev_priv);
382 i915_redisable_vga_power_on(dev_priv->dev);
385 static void vlv_display_power_well_disable(struct drm_i915_private *dev_priv,
386 struct i915_power_well *power_well)
388 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DISP2D);
390 spin_lock_irq(&dev_priv->irq_lock);
391 valleyview_disable_display_irqs(dev_priv);
392 spin_unlock_irq(&dev_priv->irq_lock);
394 vlv_set_power_well(dev_priv, power_well, false);
396 vlv_power_sequencer_reset(dev_priv);
399 static void vlv_dpio_cmn_power_well_enable(struct drm_i915_private *dev_priv,
400 struct i915_power_well *power_well)
402 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC);
405 * Enable the CRI clock source so we can get at the
406 * display and the reference clock for VGA
407 * hotplug / manual detection.
409 I915_WRITE(DPLL(PIPE_B), I915_READ(DPLL(PIPE_B)) |
410 DPLL_REFA_CLK_ENABLE_VLV | DPLL_INTEGRATED_CRI_CLK_VLV);
411 udelay(1); /* >10ns for cmnreset, >0ns for sidereset */
413 vlv_set_power_well(dev_priv, power_well, true);
416 * From VLV2A0_DP_eDP_DPIO_driver_vbios_notes_10.docx -
417 * 6. De-assert cmn_reset/side_reset. Same as VLV X0.
418 * a. GUnit 0x2110 bit[0] set to 1 (def 0)
419 * b. The other bits such as sfr settings / modesel may all
422 * This should only be done on init and resume from S3 with
423 * both PLLs disabled, or we risk losing DPIO and PLL
426 I915_WRITE(DPIO_CTL, I915_READ(DPIO_CTL) | DPIO_CMNRST);
429 static void vlv_dpio_cmn_power_well_disable(struct drm_i915_private *dev_priv,
430 struct i915_power_well *power_well)
434 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC);
436 for_each_pipe(dev_priv, pipe)
437 assert_pll_disabled(dev_priv, pipe);
439 /* Assert common reset */
440 I915_WRITE(DPIO_CTL, I915_READ(DPIO_CTL) & ~DPIO_CMNRST);
442 vlv_set_power_well(dev_priv, power_well, false);
445 static void chv_dpio_cmn_power_well_enable(struct drm_i915_private *dev_priv,
446 struct i915_power_well *power_well)
450 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC &&
451 power_well->data != PUNIT_POWER_WELL_DPIO_CMN_D);
454 * Enable the CRI clock source so we can get at the
455 * display and the reference clock for VGA
456 * hotplug / manual detection.
458 if (power_well->data == PUNIT_POWER_WELL_DPIO_CMN_BC) {
460 I915_WRITE(DPLL(PIPE_B), I915_READ(DPLL(PIPE_B)) |
461 DPLL_REFA_CLK_ENABLE_VLV);
462 I915_WRITE(DPLL(PIPE_B), I915_READ(DPLL(PIPE_B)) |
463 DPLL_REFA_CLK_ENABLE_VLV | DPLL_INTEGRATED_CRI_CLK_VLV);
466 I915_WRITE(DPLL(PIPE_C), I915_READ(DPLL(PIPE_C)) |
467 DPLL_REFA_CLK_ENABLE_VLV | DPLL_INTEGRATED_CRI_CLK_VLV);
469 udelay(1); /* >10ns for cmnreset, >0ns for sidereset */
470 vlv_set_power_well(dev_priv, power_well, true);
472 /* Poll for phypwrgood signal */
473 if (wait_for(I915_READ(DISPLAY_PHY_STATUS) & PHY_POWERGOOD(phy), 1))
474 DRM_ERROR("Display PHY %d is not power up\n", phy);
476 I915_WRITE(DISPLAY_PHY_CONTROL, I915_READ(DISPLAY_PHY_CONTROL) |
477 PHY_COM_LANE_RESET_DEASSERT(phy));
480 static void chv_dpio_cmn_power_well_disable(struct drm_i915_private *dev_priv,
481 struct i915_power_well *power_well)
485 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC &&
486 power_well->data != PUNIT_POWER_WELL_DPIO_CMN_D);
488 if (power_well->data == PUNIT_POWER_WELL_DPIO_CMN_BC) {
490 assert_pll_disabled(dev_priv, PIPE_A);
491 assert_pll_disabled(dev_priv, PIPE_B);
494 assert_pll_disabled(dev_priv, PIPE_C);
497 I915_WRITE(DISPLAY_PHY_CONTROL, I915_READ(DISPLAY_PHY_CONTROL) &
498 ~PHY_COM_LANE_RESET_DEASSERT(phy));
500 vlv_set_power_well(dev_priv, power_well, false);
503 static bool chv_pipe_power_well_enabled(struct drm_i915_private *dev_priv,
504 struct i915_power_well *power_well)
506 enum pipe pipe = power_well->data;
510 mutex_lock(&dev_priv->rps.hw_lock);
512 state = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) & DP_SSS_MASK(pipe);
514 * We only ever set the power-on and power-gate states, anything
515 * else is unexpected.
517 WARN_ON(state != DP_SSS_PWR_ON(pipe) && state != DP_SSS_PWR_GATE(pipe));
518 enabled = state == DP_SSS_PWR_ON(pipe);
521 * A transient state at this point would mean some unexpected party
522 * is poking at the power controls too.
524 ctrl = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) & DP_SSC_MASK(pipe);
525 WARN_ON(ctrl << 16 != state);
527 mutex_unlock(&dev_priv->rps.hw_lock);
532 static void chv_set_pipe_power_well(struct drm_i915_private *dev_priv,
533 struct i915_power_well *power_well,
536 enum pipe pipe = power_well->data;
540 state = enable ? DP_SSS_PWR_ON(pipe) : DP_SSS_PWR_GATE(pipe);
542 mutex_lock(&dev_priv->rps.hw_lock);
545 ((vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) & DP_SSS_MASK(pipe)) == state)
550 ctrl = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ);
551 ctrl &= ~DP_SSC_MASK(pipe);
552 ctrl |= enable ? DP_SSC_PWR_ON(pipe) : DP_SSC_PWR_GATE(pipe);
553 vlv_punit_write(dev_priv, PUNIT_REG_DSPFREQ, ctrl);
555 if (wait_for(COND, 100))
556 DRM_ERROR("timout setting power well state %08x (%08x)\n",
558 vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ));
563 mutex_unlock(&dev_priv->rps.hw_lock);
566 static void chv_pipe_power_well_sync_hw(struct drm_i915_private *dev_priv,
567 struct i915_power_well *power_well)
569 chv_set_pipe_power_well(dev_priv, power_well, power_well->count > 0);
572 static void chv_pipe_power_well_enable(struct drm_i915_private *dev_priv,
573 struct i915_power_well *power_well)
575 WARN_ON_ONCE(power_well->data != PIPE_A &&
576 power_well->data != PIPE_B &&
577 power_well->data != PIPE_C);
579 chv_set_pipe_power_well(dev_priv, power_well, true);
581 if (power_well->data == PIPE_A) {
582 spin_lock_irq(&dev_priv->irq_lock);
583 valleyview_enable_display_irqs(dev_priv);
584 spin_unlock_irq(&dev_priv->irq_lock);
587 * During driver initialization/resume we can avoid restoring the
588 * part of the HW/SW state that will be inited anyway explicitly.
590 if (dev_priv->power_domains.initializing)
593 intel_hpd_init(dev_priv);
595 i915_redisable_vga_power_on(dev_priv->dev);
599 static void chv_pipe_power_well_disable(struct drm_i915_private *dev_priv,
600 struct i915_power_well *power_well)
602 WARN_ON_ONCE(power_well->data != PIPE_A &&
603 power_well->data != PIPE_B &&
604 power_well->data != PIPE_C);
606 if (power_well->data == PIPE_A) {
607 spin_lock_irq(&dev_priv->irq_lock);
608 valleyview_disable_display_irqs(dev_priv);
609 spin_unlock_irq(&dev_priv->irq_lock);
612 chv_set_pipe_power_well(dev_priv, power_well, false);
614 if (power_well->data == PIPE_A)
615 vlv_power_sequencer_reset(dev_priv);
619 * intel_display_power_get - grab a power domain reference
620 * @dev_priv: i915 device instance
621 * @domain: power domain to reference
623 * This function grabs a power domain reference for @domain and ensures that the
624 * power domain and all its parents are powered up. Therefore users should only
625 * grab a reference to the innermost power domain they need.
627 * Any power domain reference obtained by this function must have a symmetric
628 * call to intel_display_power_put() to release the reference again.
630 void intel_display_power_get(struct drm_i915_private *dev_priv,
631 enum intel_display_power_domain domain)
633 struct i915_power_domains *power_domains;
634 struct i915_power_well *power_well;
637 intel_runtime_pm_get(dev_priv);
639 power_domains = &dev_priv->power_domains;
641 mutex_lock(&power_domains->lock);
643 for_each_power_well(i, power_well, BIT(domain), power_domains) {
644 if (!power_well->count++) {
645 DRM_DEBUG_KMS("enabling %s\n", power_well->name);
646 power_well->ops->enable(dev_priv, power_well);
647 power_well->hw_enabled = true;
651 power_domains->domain_use_count[domain]++;
653 mutex_unlock(&power_domains->lock);
657 * intel_display_power_put - release a power domain reference
658 * @dev_priv: i915 device instance
659 * @domain: power domain to reference
661 * This function drops the power domain reference obtained by
662 * intel_display_power_get() and might power down the corresponding hardware
663 * block right away if this is the last reference.
665 void intel_display_power_put(struct drm_i915_private *dev_priv,
666 enum intel_display_power_domain domain)
668 struct i915_power_domains *power_domains;
669 struct i915_power_well *power_well;
672 power_domains = &dev_priv->power_domains;
674 mutex_lock(&power_domains->lock);
676 WARN_ON(!power_domains->domain_use_count[domain]);
677 power_domains->domain_use_count[domain]--;
679 for_each_power_well_rev(i, power_well, BIT(domain), power_domains) {
680 WARN_ON(!power_well->count);
682 if (!--power_well->count && i915.disable_power_well) {
683 DRM_DEBUG_KMS("disabling %s\n", power_well->name);
684 power_well->hw_enabled = false;
685 power_well->ops->disable(dev_priv, power_well);
689 mutex_unlock(&power_domains->lock);
691 intel_runtime_pm_put(dev_priv);
694 #define POWER_DOMAIN_MASK (BIT(POWER_DOMAIN_NUM) - 1)
696 #define HSW_ALWAYS_ON_POWER_DOMAINS ( \
697 BIT(POWER_DOMAIN_PIPE_A) | \
698 BIT(POWER_DOMAIN_TRANSCODER_EDP) | \
699 BIT(POWER_DOMAIN_PORT_DDI_A_2_LANES) | \
700 BIT(POWER_DOMAIN_PORT_DDI_A_4_LANES) | \
701 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \
702 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \
703 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \
704 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \
705 BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) | \
706 BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) | \
707 BIT(POWER_DOMAIN_PORT_CRT) | \
708 BIT(POWER_DOMAIN_PLLS) | \
709 BIT(POWER_DOMAIN_INIT))
710 #define HSW_DISPLAY_POWER_DOMAINS ( \
711 (POWER_DOMAIN_MASK & ~HSW_ALWAYS_ON_POWER_DOMAINS) | \
712 BIT(POWER_DOMAIN_INIT))
714 #define BDW_ALWAYS_ON_POWER_DOMAINS ( \
715 HSW_ALWAYS_ON_POWER_DOMAINS | \
716 BIT(POWER_DOMAIN_PIPE_A_PANEL_FITTER))
717 #define BDW_DISPLAY_POWER_DOMAINS ( \
718 (POWER_DOMAIN_MASK & ~BDW_ALWAYS_ON_POWER_DOMAINS) | \
719 BIT(POWER_DOMAIN_INIT))
721 #define VLV_ALWAYS_ON_POWER_DOMAINS BIT(POWER_DOMAIN_INIT)
722 #define VLV_DISPLAY_POWER_DOMAINS POWER_DOMAIN_MASK
724 #define VLV_DPIO_CMN_BC_POWER_DOMAINS ( \
725 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \
726 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \
727 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \
728 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \
729 BIT(POWER_DOMAIN_PORT_CRT) | \
730 BIT(POWER_DOMAIN_INIT))
732 #define VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS ( \
733 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \
734 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \
735 BIT(POWER_DOMAIN_INIT))
737 #define VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS ( \
738 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \
739 BIT(POWER_DOMAIN_INIT))
741 #define VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS ( \
742 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \
743 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \
744 BIT(POWER_DOMAIN_INIT))
746 #define VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS ( \
747 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \
748 BIT(POWER_DOMAIN_INIT))
750 #define CHV_PIPE_A_POWER_DOMAINS ( \
751 BIT(POWER_DOMAIN_PIPE_A) | \
752 BIT(POWER_DOMAIN_INIT))
754 #define CHV_PIPE_B_POWER_DOMAINS ( \
755 BIT(POWER_DOMAIN_PIPE_B) | \
756 BIT(POWER_DOMAIN_INIT))
758 #define CHV_PIPE_C_POWER_DOMAINS ( \
759 BIT(POWER_DOMAIN_PIPE_C) | \
760 BIT(POWER_DOMAIN_INIT))
762 #define CHV_DPIO_CMN_BC_POWER_DOMAINS ( \
763 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \
764 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \
765 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \
766 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \
767 BIT(POWER_DOMAIN_INIT))
769 #define CHV_DPIO_CMN_D_POWER_DOMAINS ( \
770 BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) | \
771 BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) | \
772 BIT(POWER_DOMAIN_INIT))
774 #define CHV_DPIO_TX_D_LANES_01_POWER_DOMAINS ( \
775 BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) | \
776 BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) | \
777 BIT(POWER_DOMAIN_INIT))
779 #define CHV_DPIO_TX_D_LANES_23_POWER_DOMAINS ( \
780 BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) | \
781 BIT(POWER_DOMAIN_INIT))
783 static const struct i915_power_well_ops i9xx_always_on_power_well_ops = {
784 .sync_hw = i9xx_always_on_power_well_noop,
785 .enable = i9xx_always_on_power_well_noop,
786 .disable = i9xx_always_on_power_well_noop,
787 .is_enabled = i9xx_always_on_power_well_enabled,
790 static const struct i915_power_well_ops chv_pipe_power_well_ops = {
791 .sync_hw = chv_pipe_power_well_sync_hw,
792 .enable = chv_pipe_power_well_enable,
793 .disable = chv_pipe_power_well_disable,
794 .is_enabled = chv_pipe_power_well_enabled,
797 static const struct i915_power_well_ops chv_dpio_cmn_power_well_ops = {
798 .sync_hw = vlv_power_well_sync_hw,
799 .enable = chv_dpio_cmn_power_well_enable,
800 .disable = chv_dpio_cmn_power_well_disable,
801 .is_enabled = vlv_power_well_enabled,
804 static struct i915_power_well i9xx_always_on_power_well[] = {
808 .domains = POWER_DOMAIN_MASK,
809 .ops = &i9xx_always_on_power_well_ops,
813 static const struct i915_power_well_ops hsw_power_well_ops = {
814 .sync_hw = hsw_power_well_sync_hw,
815 .enable = hsw_power_well_enable,
816 .disable = hsw_power_well_disable,
817 .is_enabled = hsw_power_well_enabled,
820 static struct i915_power_well hsw_power_wells[] = {
824 .domains = HSW_ALWAYS_ON_POWER_DOMAINS,
825 .ops = &i9xx_always_on_power_well_ops,
829 .domains = HSW_DISPLAY_POWER_DOMAINS,
830 .ops = &hsw_power_well_ops,
834 static struct i915_power_well bdw_power_wells[] = {
838 .domains = BDW_ALWAYS_ON_POWER_DOMAINS,
839 .ops = &i9xx_always_on_power_well_ops,
843 .domains = BDW_DISPLAY_POWER_DOMAINS,
844 .ops = &hsw_power_well_ops,
848 static const struct i915_power_well_ops vlv_display_power_well_ops = {
849 .sync_hw = vlv_power_well_sync_hw,
850 .enable = vlv_display_power_well_enable,
851 .disable = vlv_display_power_well_disable,
852 .is_enabled = vlv_power_well_enabled,
855 static const struct i915_power_well_ops vlv_dpio_cmn_power_well_ops = {
856 .sync_hw = vlv_power_well_sync_hw,
857 .enable = vlv_dpio_cmn_power_well_enable,
858 .disable = vlv_dpio_cmn_power_well_disable,
859 .is_enabled = vlv_power_well_enabled,
862 static const struct i915_power_well_ops vlv_dpio_power_well_ops = {
863 .sync_hw = vlv_power_well_sync_hw,
864 .enable = vlv_power_well_enable,
865 .disable = vlv_power_well_disable,
866 .is_enabled = vlv_power_well_enabled,
869 static struct i915_power_well vlv_power_wells[] = {
873 .domains = VLV_ALWAYS_ON_POWER_DOMAINS,
874 .ops = &i9xx_always_on_power_well_ops,
878 .domains = VLV_DISPLAY_POWER_DOMAINS,
879 .data = PUNIT_POWER_WELL_DISP2D,
880 .ops = &vlv_display_power_well_ops,
883 .name = "dpio-tx-b-01",
884 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS |
885 VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS |
886 VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS |
887 VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
888 .ops = &vlv_dpio_power_well_ops,
889 .data = PUNIT_POWER_WELL_DPIO_TX_B_LANES_01,
892 .name = "dpio-tx-b-23",
893 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS |
894 VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS |
895 VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS |
896 VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
897 .ops = &vlv_dpio_power_well_ops,
898 .data = PUNIT_POWER_WELL_DPIO_TX_B_LANES_23,
901 .name = "dpio-tx-c-01",
902 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS |
903 VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS |
904 VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS |
905 VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
906 .ops = &vlv_dpio_power_well_ops,
907 .data = PUNIT_POWER_WELL_DPIO_TX_C_LANES_01,
910 .name = "dpio-tx-c-23",
911 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS |
912 VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS |
913 VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS |
914 VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
915 .ops = &vlv_dpio_power_well_ops,
916 .data = PUNIT_POWER_WELL_DPIO_TX_C_LANES_23,
919 .name = "dpio-common",
920 .domains = VLV_DPIO_CMN_BC_POWER_DOMAINS,
921 .data = PUNIT_POWER_WELL_DPIO_CMN_BC,
922 .ops = &vlv_dpio_cmn_power_well_ops,
926 static struct i915_power_well chv_power_wells[] = {
930 .domains = VLV_ALWAYS_ON_POWER_DOMAINS,
931 .ops = &i9xx_always_on_power_well_ops,
936 .domains = VLV_DISPLAY_POWER_DOMAINS,
937 .data = PUNIT_POWER_WELL_DISP2D,
938 .ops = &vlv_display_power_well_ops,
944 * FIXME: pipe A power well seems to be the new disp2d well.
945 * At least all registers seem to be housed there. Figure
946 * out if this a a temporary situation in pre-production
947 * hardware or a permanent state of affairs.
949 .domains = CHV_PIPE_A_POWER_DOMAINS | VLV_DISPLAY_POWER_DOMAINS,
951 .ops = &chv_pipe_power_well_ops,
956 .domains = CHV_PIPE_B_POWER_DOMAINS,
958 .ops = &chv_pipe_power_well_ops,
962 .domains = CHV_PIPE_C_POWER_DOMAINS,
964 .ops = &chv_pipe_power_well_ops,
968 .name = "dpio-common-bc",
970 * XXX: cmnreset for one PHY seems to disturb the other.
971 * As a workaround keep both powered on at the same
974 .domains = CHV_DPIO_CMN_BC_POWER_DOMAINS | CHV_DPIO_CMN_D_POWER_DOMAINS,
975 .data = PUNIT_POWER_WELL_DPIO_CMN_BC,
976 .ops = &chv_dpio_cmn_power_well_ops,
979 .name = "dpio-common-d",
981 * XXX: cmnreset for one PHY seems to disturb the other.
982 * As a workaround keep both powered on at the same
985 .domains = CHV_DPIO_CMN_BC_POWER_DOMAINS | CHV_DPIO_CMN_D_POWER_DOMAINS,
986 .data = PUNIT_POWER_WELL_DPIO_CMN_D,
987 .ops = &chv_dpio_cmn_power_well_ops,
991 .name = "dpio-tx-b-01",
992 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS |
993 VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS,
994 .ops = &vlv_dpio_power_well_ops,
995 .data = PUNIT_POWER_WELL_DPIO_TX_B_LANES_01,
998 .name = "dpio-tx-b-23",
999 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS |
1000 VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS,
1001 .ops = &vlv_dpio_power_well_ops,
1002 .data = PUNIT_POWER_WELL_DPIO_TX_B_LANES_23,
1005 .name = "dpio-tx-c-01",
1006 .domains = VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS |
1007 VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
1008 .ops = &vlv_dpio_power_well_ops,
1009 .data = PUNIT_POWER_WELL_DPIO_TX_C_LANES_01,
1012 .name = "dpio-tx-c-23",
1013 .domains = VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS |
1014 VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
1015 .ops = &vlv_dpio_power_well_ops,
1016 .data = PUNIT_POWER_WELL_DPIO_TX_C_LANES_23,
1019 .name = "dpio-tx-d-01",
1020 .domains = CHV_DPIO_TX_D_LANES_01_POWER_DOMAINS |
1021 CHV_DPIO_TX_D_LANES_23_POWER_DOMAINS,
1022 .ops = &vlv_dpio_power_well_ops,
1023 .data = PUNIT_POWER_WELL_DPIO_TX_D_LANES_01,
1026 .name = "dpio-tx-d-23",
1027 .domains = CHV_DPIO_TX_D_LANES_01_POWER_DOMAINS |
1028 CHV_DPIO_TX_D_LANES_23_POWER_DOMAINS,
1029 .ops = &vlv_dpio_power_well_ops,
1030 .data = PUNIT_POWER_WELL_DPIO_TX_D_LANES_23,
1035 static struct i915_power_well *lookup_power_well(struct drm_i915_private *dev_priv,
1036 enum punit_power_well power_well_id)
1038 struct i915_power_domains *power_domains = &dev_priv->power_domains;
1039 struct i915_power_well *power_well;
1042 for_each_power_well(i, power_well, POWER_DOMAIN_MASK, power_domains) {
1043 if (power_well->data == power_well_id)
1050 #define set_power_wells(power_domains, __power_wells) ({ \
1051 (power_domains)->power_wells = (__power_wells); \
1052 (power_domains)->power_well_count = ARRAY_SIZE(__power_wells); \
1056 * intel_power_domains_init - initializes the power domain structures
1057 * @dev_priv: i915 device instance
1059 * Initializes the power domain structures for @dev_priv depending upon the
1060 * supported platform.
1062 int intel_power_domains_init(struct drm_i915_private *dev_priv)
1064 struct i915_power_domains *power_domains = &dev_priv->power_domains;
1066 mutex_init(&power_domains->lock);
1069 * The enabling order will be from lower to higher indexed wells,
1070 * the disabling order is reversed.
1072 if (IS_HASWELL(dev_priv->dev)) {
1073 set_power_wells(power_domains, hsw_power_wells);
1074 hsw_pwr = power_domains;
1075 } else if (IS_BROADWELL(dev_priv->dev)) {
1076 set_power_wells(power_domains, bdw_power_wells);
1077 hsw_pwr = power_domains;
1078 } else if (IS_CHERRYVIEW(dev_priv->dev)) {
1079 set_power_wells(power_domains, chv_power_wells);
1080 } else if (IS_VALLEYVIEW(dev_priv->dev)) {
1081 set_power_wells(power_domains, vlv_power_wells);
1083 set_power_wells(power_domains, i9xx_always_on_power_well);
1089 static void intel_runtime_pm_disable(struct drm_i915_private *dev_priv)
1091 struct drm_device *dev = dev_priv->dev;
1092 struct device *device = &dev->pdev->dev;
1094 if (!HAS_RUNTIME_PM(dev))
1097 if (!intel_enable_rc6(dev))
1100 /* Make sure we're not suspended first. */
1101 pm_runtime_get_sync(device);
1102 pm_runtime_disable(device);
1106 * intel_power_domains_fini - finalizes the power domain structures
1107 * @dev_priv: i915 device instance
1109 * Finalizes the power domain structures for @dev_priv depending upon the
1110 * supported platform. This function also disables runtime pm and ensures that
1111 * the device stays powered up so that the driver can be reloaded.
1113 void intel_power_domains_fini(struct drm_i915_private *dev_priv)
1115 intel_runtime_pm_disable(dev_priv);
1117 /* The i915.ko module is still not prepared to be loaded when
1118 * the power well is not enabled, so just enable it in case
1119 * we're going to unload/reload. */
1120 intel_display_set_init_power(dev_priv, true);
1125 static void intel_power_domains_resume(struct drm_i915_private *dev_priv)
1127 struct i915_power_domains *power_domains = &dev_priv->power_domains;
1128 struct i915_power_well *power_well;
1131 mutex_lock(&power_domains->lock);
1132 for_each_power_well(i, power_well, POWER_DOMAIN_MASK, power_domains) {
1133 power_well->ops->sync_hw(dev_priv, power_well);
1134 power_well->hw_enabled = power_well->ops->is_enabled(dev_priv,
1137 mutex_unlock(&power_domains->lock);
1140 static void vlv_cmnlane_wa(struct drm_i915_private *dev_priv)
1142 struct i915_power_well *cmn =
1143 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_BC);
1144 struct i915_power_well *disp2d =
1145 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DISP2D);
1147 /* If the display might be already active skip this */
1148 if (cmn->ops->is_enabled(dev_priv, cmn) &&
1149 disp2d->ops->is_enabled(dev_priv, disp2d) &&
1150 I915_READ(DPIO_CTL) & DPIO_CMNRST)
1153 DRM_DEBUG_KMS("toggling display PHY side reset\n");
1155 /* cmnlane needs DPLL registers */
1156 disp2d->ops->enable(dev_priv, disp2d);
1159 * From VLV2A0_DP_eDP_HDMI_DPIO_driver_vbios_notes_11.docx:
1160 * Need to assert and de-assert PHY SB reset by gating the
1161 * common lane power, then un-gating it.
1162 * Simply ungating isn't enough to reset the PHY enough to get
1163 * ports and lanes running.
1165 cmn->ops->disable(dev_priv, cmn);
1169 * intel_power_domains_init_hw - initialize hardware power domain state
1170 * @dev_priv: i915 device instance
1172 * This function initializes the hardware power domain state and enables all
1173 * power domains using intel_display_set_init_power().
1175 void intel_power_domains_init_hw(struct drm_i915_private *dev_priv)
1177 struct drm_device *dev = dev_priv->dev;
1178 struct i915_power_domains *power_domains = &dev_priv->power_domains;
1180 power_domains->initializing = true;
1182 if (IS_VALLEYVIEW(dev) && !IS_CHERRYVIEW(dev)) {
1183 mutex_lock(&power_domains->lock);
1184 vlv_cmnlane_wa(dev_priv);
1185 mutex_unlock(&power_domains->lock);
1188 /* For now, we need the power well to be always enabled. */
1189 intel_display_set_init_power(dev_priv, true);
1190 intel_power_domains_resume(dev_priv);
1191 power_domains->initializing = false;
1195 * intel_aux_display_runtime_get - grab an auxilliary power domain reference
1196 * @dev_priv: i915 device instance
1198 * This function grabs a power domain reference for the auxiliary power domain
1199 * (for access to the GMBUS and DP AUX blocks) and ensures that it and all its
1200 * parents are powered up. Therefore users should only grab a reference to the
1201 * innermost power domain they need.
1203 * Any power domain reference obtained by this function must have a symmetric
1204 * call to intel_aux_display_runtime_put() to release the reference again.
1206 void intel_aux_display_runtime_get(struct drm_i915_private *dev_priv)
1208 intel_runtime_pm_get(dev_priv);
1212 * intel_aux_display_runtime_put - release an auxilliary power domain reference
1213 * @dev_priv: i915 device instance
1215 * This function drops the auxilliary power domain reference obtained by
1216 * intel_aux_display_runtime_get() and might power down the corresponding
1217 * hardware block right away if this is the last reference.
1219 void intel_aux_display_runtime_put(struct drm_i915_private *dev_priv)
1221 intel_runtime_pm_put(dev_priv);
1225 * intel_runtime_pm_get - grab a runtime pm reference
1226 * @dev_priv: i915 device instance
1228 * This function grabs a device-level runtime pm reference (mostly used for GEM
1229 * code to ensure the GTT or GT is on) and ensures that it is powered up.
1231 * Any runtime pm reference obtained by this function must have a symmetric
1232 * call to intel_runtime_pm_put() to release the reference again.
1234 void intel_runtime_pm_get(struct drm_i915_private *dev_priv)
1236 struct drm_device *dev = dev_priv->dev;
1237 struct device *device = &dev->pdev->dev;
1239 if (!HAS_RUNTIME_PM(dev))
1242 pm_runtime_get_sync(device);
1243 WARN(dev_priv->pm.suspended, "Device still suspended.\n");
1247 * intel_runtime_pm_get_noresume - grab a runtime pm reference
1248 * @dev_priv: i915 device instance
1250 * This function grabs a device-level runtime pm reference (mostly used for GEM
1251 * code to ensure the GTT or GT is on).
1253 * It will _not_ power up the device but instead only check that it's powered
1254 * on. Therefore it is only valid to call this functions from contexts where
1255 * the device is known to be powered up and where trying to power it up would
1256 * result in hilarity and deadlocks. That pretty much means only the system
1257 * suspend/resume code where this is used to grab runtime pm references for
1258 * delayed setup down in work items.
1260 * Any runtime pm reference obtained by this function must have a symmetric
1261 * call to intel_runtime_pm_put() to release the reference again.
1263 void intel_runtime_pm_get_noresume(struct drm_i915_private *dev_priv)
1265 struct drm_device *dev = dev_priv->dev;
1266 struct device *device = &dev->pdev->dev;
1268 if (!HAS_RUNTIME_PM(dev))
1271 WARN(dev_priv->pm.suspended, "Getting nosync-ref while suspended.\n");
1272 pm_runtime_get_noresume(device);
1276 * intel_runtime_pm_put - release a runtime pm reference
1277 * @dev_priv: i915 device instance
1279 * This function drops the device-level runtime pm reference obtained by
1280 * intel_runtime_pm_get() and might power down the corresponding
1281 * hardware block right away if this is the last reference.
1283 void intel_runtime_pm_put(struct drm_i915_private *dev_priv)
1285 struct drm_device *dev = dev_priv->dev;
1286 struct device *device = &dev->pdev->dev;
1288 if (!HAS_RUNTIME_PM(dev))
1291 pm_runtime_mark_last_busy(device);
1292 pm_runtime_put_autosuspend(device);
1296 * intel_runtime_pm_enable - enable runtime pm
1297 * @dev_priv: i915 device instance
1299 * This function enables runtime pm at the end of the driver load sequence.
1301 * Note that this function does currently not enable runtime pm for the
1302 * subordinate display power domains. That is only done on the first modeset
1303 * using intel_display_set_init_power().
1305 void intel_runtime_pm_enable(struct drm_i915_private *dev_priv)
1307 struct drm_device *dev = dev_priv->dev;
1308 struct device *device = &dev->pdev->dev;
1310 if (!HAS_RUNTIME_PM(dev))
1313 pm_runtime_set_active(device);
1316 * RPM depends on RC6 to save restore the GT HW context, so make RC6 a
1319 if (!intel_enable_rc6(dev)) {
1320 DRM_INFO("RC6 disabled, disabling runtime PM support\n");
1324 pm_runtime_set_autosuspend_delay(device, 10000); /* 10s */
1325 pm_runtime_mark_last_busy(device);
1326 pm_runtime_use_autosuspend(device);
1328 pm_runtime_put_autosuspend(device);
1331 /* Display audio driver power well request */
1332 int i915_request_power_well(void)
1334 struct drm_i915_private *dev_priv;
1339 dev_priv = container_of(hsw_pwr, struct drm_i915_private,
1341 intel_display_power_get(dev_priv, POWER_DOMAIN_AUDIO);
1344 EXPORT_SYMBOL_GPL(i915_request_power_well);
1346 /* Display audio driver power well release */
1347 int i915_release_power_well(void)
1349 struct drm_i915_private *dev_priv;
1354 dev_priv = container_of(hsw_pwr, struct drm_i915_private,
1356 intel_display_power_put(dev_priv, POWER_DOMAIN_AUDIO);
1359 EXPORT_SYMBOL_GPL(i915_release_power_well);
1362 * Private interface for the audio driver to get CDCLK in kHz.
1364 * Caller must request power well using i915_request_power_well() prior to
1367 int i915_get_cdclk_freq(void)
1369 struct drm_i915_private *dev_priv;
1374 dev_priv = container_of(hsw_pwr, struct drm_i915_private,
1377 return intel_ddi_get_cdclk_freq(dev_priv);
1379 EXPORT_SYMBOL_GPL(i915_get_cdclk_freq);