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"
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.
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.
52 #define GEN9_ENABLE_DC5(dev) 0
53 #define SKL_ENABLE_DC6(dev) IS_SKYLAKE(dev)
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))
68 bool intel_display_power_well_is_enabled(struct drm_i915_private *dev_priv,
72 * We should only use the power well if we explicitly asked the hardware to
73 * enable it, so check if it's enabled and also check if we've requested it to
76 static bool hsw_power_well_enabled(struct drm_i915_private *dev_priv,
77 struct i915_power_well *power_well)
79 return I915_READ(HSW_PWR_WELL_DRIVER) ==
80 (HSW_PWR_WELL_ENABLE_REQUEST | HSW_PWR_WELL_STATE_ENABLED);
84 * __intel_display_power_is_enabled - unlocked check for a power domain
85 * @dev_priv: i915 device instance
86 * @domain: power domain to check
88 * This is the unlocked version of intel_display_power_is_enabled() and should
89 * only be used from error capture and recovery code where deadlocks are
93 * True when the power domain is enabled, false otherwise.
95 bool __intel_display_power_is_enabled(struct drm_i915_private *dev_priv,
96 enum intel_display_power_domain domain)
98 struct i915_power_domains *power_domains;
99 struct i915_power_well *power_well;
103 if (dev_priv->pm.suspended)
106 power_domains = &dev_priv->power_domains;
110 for_each_power_well_rev(i, power_well, BIT(domain), power_domains) {
111 if (power_well->always_on)
114 if (!power_well->hw_enabled) {
124 * intel_display_power_is_enabled - check for a power domain
125 * @dev_priv: i915 device instance
126 * @domain: power domain to check
128 * This function can be used to check the hw power domain state. It is mostly
129 * used in hardware state readout functions. Everywhere else code should rely
130 * upon explicit power domain reference counting to ensure that the hardware
131 * block is powered up before accessing it.
133 * Callers must hold the relevant modesetting locks to ensure that concurrent
134 * threads can't disable the power well while the caller tries to read a few
138 * True when the power domain is enabled, false otherwise.
140 bool intel_display_power_is_enabled(struct drm_i915_private *dev_priv,
141 enum intel_display_power_domain domain)
143 struct i915_power_domains *power_domains;
146 power_domains = &dev_priv->power_domains;
148 mutex_lock(&power_domains->lock);
149 ret = __intel_display_power_is_enabled(dev_priv, domain);
150 mutex_unlock(&power_domains->lock);
156 * intel_display_set_init_power - set the initial power domain state
157 * @dev_priv: i915 device instance
158 * @enable: whether to enable or disable the initial power domain state
160 * For simplicity our driver load/unload and system suspend/resume code assumes
161 * that all power domains are always enabled. This functions controls the state
162 * of this little hack. While the initial power domain state is enabled runtime
163 * pm is effectively disabled.
165 void intel_display_set_init_power(struct drm_i915_private *dev_priv,
168 if (dev_priv->power_domains.init_power_on == enable)
172 intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);
174 intel_display_power_put(dev_priv, POWER_DOMAIN_INIT);
176 dev_priv->power_domains.init_power_on = enable;
180 * Starting with Haswell, we have a "Power Down Well" that can be turned off
181 * when not needed anymore. We have 4 registers that can request the power well
182 * to be enabled, and it will only be disabled if none of the registers is
183 * requesting it to be enabled.
185 static void hsw_power_well_post_enable(struct drm_i915_private *dev_priv)
187 struct drm_device *dev = dev_priv->dev;
190 * After we re-enable the power well, if we touch VGA register 0x3d5
191 * we'll get unclaimed register interrupts. This stops after we write
192 * anything to the VGA MSR register. The vgacon module uses this
193 * register all the time, so if we unbind our driver and, as a
194 * consequence, bind vgacon, we'll get stuck in an infinite loop at
195 * console_unlock(). So make here we touch the VGA MSR register, making
196 * sure vgacon can keep working normally without triggering interrupts
197 * and error messages.
199 vga_get_uninterruptible(dev->pdev, VGA_RSRC_LEGACY_IO);
200 outb(inb(VGA_MSR_READ), VGA_MSR_WRITE);
201 vga_put(dev->pdev, VGA_RSRC_LEGACY_IO);
203 if (IS_BROADWELL(dev))
204 gen8_irq_power_well_post_enable(dev_priv,
205 1 << PIPE_C | 1 << PIPE_B);
208 static void skl_power_well_post_enable(struct drm_i915_private *dev_priv,
209 struct i915_power_well *power_well)
211 struct drm_device *dev = dev_priv->dev;
214 * After we re-enable the power well, if we touch VGA register 0x3d5
215 * we'll get unclaimed register interrupts. This stops after we write
216 * anything to the VGA MSR register. The vgacon module uses this
217 * register all the time, so if we unbind our driver and, as a
218 * consequence, bind vgacon, we'll get stuck in an infinite loop at
219 * console_unlock(). So make here we touch the VGA MSR register, making
220 * sure vgacon can keep working normally without triggering interrupts
221 * and error messages.
223 if (power_well->data == SKL_DISP_PW_2) {
224 vga_get_uninterruptible(dev->pdev, VGA_RSRC_LEGACY_IO);
225 outb(inb(VGA_MSR_READ), VGA_MSR_WRITE);
226 vga_put(dev->pdev, VGA_RSRC_LEGACY_IO);
228 gen8_irq_power_well_post_enable(dev_priv,
229 1 << PIPE_C | 1 << PIPE_B);
232 if (power_well->data == SKL_DISP_PW_1) {
233 intel_prepare_ddi(dev);
234 gen8_irq_power_well_post_enable(dev_priv, 1 << PIPE_A);
238 static void hsw_set_power_well(struct drm_i915_private *dev_priv,
239 struct i915_power_well *power_well, bool enable)
241 bool is_enabled, enable_requested;
244 tmp = I915_READ(HSW_PWR_WELL_DRIVER);
245 is_enabled = tmp & HSW_PWR_WELL_STATE_ENABLED;
246 enable_requested = tmp & HSW_PWR_WELL_ENABLE_REQUEST;
249 if (!enable_requested)
250 I915_WRITE(HSW_PWR_WELL_DRIVER,
251 HSW_PWR_WELL_ENABLE_REQUEST);
254 DRM_DEBUG_KMS("Enabling power well\n");
255 if (wait_for((I915_READ(HSW_PWR_WELL_DRIVER) &
256 HSW_PWR_WELL_STATE_ENABLED), 20))
257 DRM_ERROR("Timeout enabling power well\n");
258 hsw_power_well_post_enable(dev_priv);
262 if (enable_requested) {
263 I915_WRITE(HSW_PWR_WELL_DRIVER, 0);
264 POSTING_READ(HSW_PWR_WELL_DRIVER);
265 DRM_DEBUG_KMS("Requesting to disable the power well\n");
270 #define SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS ( \
271 BIT(POWER_DOMAIN_TRANSCODER_A) | \
272 BIT(POWER_DOMAIN_PIPE_B) | \
273 BIT(POWER_DOMAIN_TRANSCODER_B) | \
274 BIT(POWER_DOMAIN_PIPE_C) | \
275 BIT(POWER_DOMAIN_TRANSCODER_C) | \
276 BIT(POWER_DOMAIN_PIPE_B_PANEL_FITTER) | \
277 BIT(POWER_DOMAIN_PIPE_C_PANEL_FITTER) | \
278 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \
279 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \
280 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \
281 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \
282 BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) | \
283 BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) | \
284 BIT(POWER_DOMAIN_AUX_B) | \
285 BIT(POWER_DOMAIN_AUX_C) | \
286 BIT(POWER_DOMAIN_AUX_D) | \
287 BIT(POWER_DOMAIN_AUDIO) | \
288 BIT(POWER_DOMAIN_VGA) | \
289 BIT(POWER_DOMAIN_INIT))
290 #define SKL_DISPLAY_POWERWELL_1_POWER_DOMAINS ( \
291 SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS | \
292 BIT(POWER_DOMAIN_PLLS) | \
293 BIT(POWER_DOMAIN_PIPE_A) | \
294 BIT(POWER_DOMAIN_TRANSCODER_EDP) | \
295 BIT(POWER_DOMAIN_PIPE_A_PANEL_FITTER) | \
296 BIT(POWER_DOMAIN_PORT_DDI_A_2_LANES) | \
297 BIT(POWER_DOMAIN_PORT_DDI_A_4_LANES) | \
298 BIT(POWER_DOMAIN_AUX_A) | \
299 BIT(POWER_DOMAIN_INIT))
300 #define SKL_DISPLAY_DDI_A_E_POWER_DOMAINS ( \
301 BIT(POWER_DOMAIN_PORT_DDI_A_2_LANES) | \
302 BIT(POWER_DOMAIN_PORT_DDI_A_4_LANES) | \
303 BIT(POWER_DOMAIN_INIT))
304 #define SKL_DISPLAY_DDI_B_POWER_DOMAINS ( \
305 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \
306 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \
307 BIT(POWER_DOMAIN_INIT))
308 #define SKL_DISPLAY_DDI_C_POWER_DOMAINS ( \
309 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \
310 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \
311 BIT(POWER_DOMAIN_INIT))
312 #define SKL_DISPLAY_DDI_D_POWER_DOMAINS ( \
313 BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) | \
314 BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) | \
315 BIT(POWER_DOMAIN_INIT))
316 #define SKL_DISPLAY_MISC_IO_POWER_DOMAINS ( \
317 SKL_DISPLAY_POWERWELL_1_POWER_DOMAINS | \
318 BIT(POWER_DOMAIN_PLLS) | \
319 BIT(POWER_DOMAIN_INIT))
320 #define SKL_DISPLAY_ALWAYS_ON_POWER_DOMAINS ( \
321 (POWER_DOMAIN_MASK & ~(SKL_DISPLAY_POWERWELL_1_POWER_DOMAINS | \
322 SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS | \
323 SKL_DISPLAY_DDI_A_E_POWER_DOMAINS | \
324 SKL_DISPLAY_DDI_B_POWER_DOMAINS | \
325 SKL_DISPLAY_DDI_C_POWER_DOMAINS | \
326 SKL_DISPLAY_DDI_D_POWER_DOMAINS | \
327 SKL_DISPLAY_MISC_IO_POWER_DOMAINS)) | \
328 BIT(POWER_DOMAIN_INIT))
330 #define BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS ( \
331 BIT(POWER_DOMAIN_TRANSCODER_A) | \
332 BIT(POWER_DOMAIN_PIPE_B) | \
333 BIT(POWER_DOMAIN_TRANSCODER_B) | \
334 BIT(POWER_DOMAIN_PIPE_C) | \
335 BIT(POWER_DOMAIN_TRANSCODER_C) | \
336 BIT(POWER_DOMAIN_PIPE_B_PANEL_FITTER) | \
337 BIT(POWER_DOMAIN_PIPE_C_PANEL_FITTER) | \
338 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \
339 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \
340 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \
341 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \
342 BIT(POWER_DOMAIN_AUX_B) | \
343 BIT(POWER_DOMAIN_AUX_C) | \
344 BIT(POWER_DOMAIN_AUDIO) | \
345 BIT(POWER_DOMAIN_VGA) | \
346 BIT(POWER_DOMAIN_INIT))
347 #define BXT_DISPLAY_POWERWELL_1_POWER_DOMAINS ( \
348 BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS | \
349 BIT(POWER_DOMAIN_PIPE_A) | \
350 BIT(POWER_DOMAIN_TRANSCODER_EDP) | \
351 BIT(POWER_DOMAIN_PIPE_A_PANEL_FITTER) | \
352 BIT(POWER_DOMAIN_PORT_DDI_A_2_LANES) | \
353 BIT(POWER_DOMAIN_PORT_DDI_A_4_LANES) | \
354 BIT(POWER_DOMAIN_AUX_A) | \
355 BIT(POWER_DOMAIN_PLLS) | \
356 BIT(POWER_DOMAIN_INIT))
357 #define BXT_DISPLAY_ALWAYS_ON_POWER_DOMAINS ( \
358 (POWER_DOMAIN_MASK & ~(BXT_DISPLAY_POWERWELL_1_POWER_DOMAINS | \
359 BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS)) | \
360 BIT(POWER_DOMAIN_INIT))
362 static void assert_can_enable_dc9(struct drm_i915_private *dev_priv)
364 struct drm_device *dev = dev_priv->dev;
366 WARN(!IS_BROXTON(dev), "Platform doesn't support DC9.\n");
367 WARN((I915_READ(DC_STATE_EN) & DC_STATE_EN_DC9),
368 "DC9 already programmed to be enabled.\n");
369 WARN(I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5,
370 "DC5 still not disabled to enable DC9.\n");
371 WARN(I915_READ(HSW_PWR_WELL_DRIVER), "Power well on.\n");
372 WARN(intel_irqs_enabled(dev_priv), "Interrupts not disabled yet.\n");
375 * TODO: check for the following to verify the conditions to enter DC9
376 * state are satisfied:
377 * 1] Check relevant display engine registers to verify if mode set
378 * disable sequence was followed.
379 * 2] Check if display uninitialize sequence is initialized.
383 static void assert_can_disable_dc9(struct drm_i915_private *dev_priv)
385 WARN(intel_irqs_enabled(dev_priv), "Interrupts not disabled yet.\n");
386 WARN(!(I915_READ(DC_STATE_EN) & DC_STATE_EN_DC9),
387 "DC9 already programmed to be disabled.\n");
388 WARN(I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5,
389 "DC5 still not disabled.\n");
392 * TODO: check for the following to verify DC9 state was indeed
393 * entered before programming to disable it:
394 * 1] Check relevant display engine registers to verify if mode
395 * set disable sequence was followed.
396 * 2] Check if display uninitialize sequence is initialized.
400 void bxt_enable_dc9(struct drm_i915_private *dev_priv)
404 assert_can_enable_dc9(dev_priv);
406 DRM_DEBUG_KMS("Enabling DC9\n");
408 val = I915_READ(DC_STATE_EN);
409 val |= DC_STATE_EN_DC9;
410 I915_WRITE(DC_STATE_EN, val);
411 POSTING_READ(DC_STATE_EN);
414 void bxt_disable_dc9(struct drm_i915_private *dev_priv)
418 assert_can_disable_dc9(dev_priv);
420 DRM_DEBUG_KMS("Disabling DC9\n");
422 val = I915_READ(DC_STATE_EN);
423 val &= ~DC_STATE_EN_DC9;
424 I915_WRITE(DC_STATE_EN, val);
425 POSTING_READ(DC_STATE_EN);
428 static void gen9_set_dc_state_debugmask_memory_up(
429 struct drm_i915_private *dev_priv)
433 /* The below bit doesn't need to be cleared ever afterwards */
434 val = I915_READ(DC_STATE_DEBUG);
435 if (!(val & DC_STATE_DEBUG_MASK_MEMORY_UP)) {
436 val |= DC_STATE_DEBUG_MASK_MEMORY_UP;
437 I915_WRITE(DC_STATE_DEBUG, val);
438 POSTING_READ(DC_STATE_DEBUG);
442 static void assert_can_enable_dc5(struct drm_i915_private *dev_priv)
444 struct drm_device *dev = dev_priv->dev;
445 bool pg2_enabled = intel_display_power_well_is_enabled(dev_priv,
448 WARN(!IS_SKYLAKE(dev), "Platform doesn't support DC5.\n");
449 WARN(!HAS_RUNTIME_PM(dev), "Runtime PM not enabled.\n");
450 WARN(pg2_enabled, "PG2 not disabled to enable DC5.\n");
452 WARN((I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5),
453 "DC5 already programmed to be enabled.\n");
454 WARN(dev_priv->pm.suspended,
455 "DC5 cannot be enabled, if platform is runtime-suspended.\n");
457 assert_csr_loaded(dev_priv);
460 static void assert_can_disable_dc5(struct drm_i915_private *dev_priv)
462 bool pg2_enabled = intel_display_power_well_is_enabled(dev_priv,
465 * During initialization, the firmware may not be loaded yet.
466 * We still want to make sure that the DC enabling flag is cleared.
468 if (dev_priv->power_domains.initializing)
471 WARN(!pg2_enabled, "PG2 not enabled to disable DC5.\n");
472 WARN(dev_priv->pm.suspended,
473 "Disabling of DC5 while platform is runtime-suspended should never happen.\n");
476 static void gen9_enable_dc5(struct drm_i915_private *dev_priv)
480 assert_can_enable_dc5(dev_priv);
482 DRM_DEBUG_KMS("Enabling DC5\n");
484 gen9_set_dc_state_debugmask_memory_up(dev_priv);
486 val = I915_READ(DC_STATE_EN);
487 val &= ~DC_STATE_EN_UPTO_DC5_DC6_MASK;
488 val |= DC_STATE_EN_UPTO_DC5;
489 I915_WRITE(DC_STATE_EN, val);
490 POSTING_READ(DC_STATE_EN);
493 static void gen9_disable_dc5(struct drm_i915_private *dev_priv)
497 assert_can_disable_dc5(dev_priv);
499 DRM_DEBUG_KMS("Disabling DC5\n");
501 val = I915_READ(DC_STATE_EN);
502 val &= ~DC_STATE_EN_UPTO_DC5;
503 I915_WRITE(DC_STATE_EN, val);
504 POSTING_READ(DC_STATE_EN);
507 static void assert_can_enable_dc6(struct drm_i915_private *dev_priv)
509 struct drm_device *dev = dev_priv->dev;
511 WARN(!IS_SKYLAKE(dev), "Platform doesn't support DC6.\n");
512 WARN(!HAS_RUNTIME_PM(dev), "Runtime PM not enabled.\n");
513 WARN(I915_READ(UTIL_PIN_CTL) & UTIL_PIN_ENABLE,
514 "Backlight is not disabled.\n");
515 WARN((I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC6),
516 "DC6 already programmed to be enabled.\n");
518 assert_csr_loaded(dev_priv);
521 static void assert_can_disable_dc6(struct drm_i915_private *dev_priv)
524 * During initialization, the firmware may not be loaded yet.
525 * We still want to make sure that the DC enabling flag is cleared.
527 if (dev_priv->power_domains.initializing)
530 assert_csr_loaded(dev_priv);
531 WARN(!(I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC6),
532 "DC6 already programmed to be disabled.\n");
535 static void skl_enable_dc6(struct drm_i915_private *dev_priv)
539 assert_can_enable_dc6(dev_priv);
541 DRM_DEBUG_KMS("Enabling DC6\n");
543 gen9_set_dc_state_debugmask_memory_up(dev_priv);
545 val = I915_READ(DC_STATE_EN);
546 val &= ~DC_STATE_EN_UPTO_DC5_DC6_MASK;
547 val |= DC_STATE_EN_UPTO_DC6;
548 I915_WRITE(DC_STATE_EN, val);
549 POSTING_READ(DC_STATE_EN);
552 static void skl_disable_dc6(struct drm_i915_private *dev_priv)
556 assert_can_disable_dc6(dev_priv);
558 DRM_DEBUG_KMS("Disabling DC6\n");
560 val = I915_READ(DC_STATE_EN);
561 val &= ~DC_STATE_EN_UPTO_DC6;
562 I915_WRITE(DC_STATE_EN, val);
563 POSTING_READ(DC_STATE_EN);
566 static void skl_set_power_well(struct drm_i915_private *dev_priv,
567 struct i915_power_well *power_well, bool enable)
569 struct drm_device *dev = dev_priv->dev;
570 uint32_t tmp, fuse_status;
571 uint32_t req_mask, state_mask;
572 bool is_enabled, enable_requested, check_fuse_status = false;
574 tmp = I915_READ(HSW_PWR_WELL_DRIVER);
575 fuse_status = I915_READ(SKL_FUSE_STATUS);
577 switch (power_well->data) {
579 if (wait_for((I915_READ(SKL_FUSE_STATUS) &
580 SKL_FUSE_PG0_DIST_STATUS), 1)) {
581 DRM_ERROR("PG0 not enabled\n");
586 if (!(fuse_status & SKL_FUSE_PG1_DIST_STATUS)) {
587 DRM_ERROR("PG1 in disabled state\n");
591 case SKL_DISP_PW_DDI_A_E:
592 case SKL_DISP_PW_DDI_B:
593 case SKL_DISP_PW_DDI_C:
594 case SKL_DISP_PW_DDI_D:
595 case SKL_DISP_PW_MISC_IO:
598 WARN(1, "Unknown power well %lu\n", power_well->data);
602 req_mask = SKL_POWER_WELL_REQ(power_well->data);
603 enable_requested = tmp & req_mask;
604 state_mask = SKL_POWER_WELL_STATE(power_well->data);
605 is_enabled = tmp & state_mask;
608 if (!enable_requested) {
609 WARN((tmp & state_mask) &&
610 !I915_READ(HSW_PWR_WELL_BIOS),
611 "Invalid for power well status to be enabled, unless done by the BIOS, \
612 when request is to disable!\n");
613 if ((GEN9_ENABLE_DC5(dev) || SKL_ENABLE_DC6(dev)) &&
614 power_well->data == SKL_DISP_PW_2) {
615 if (SKL_ENABLE_DC6(dev)) {
616 skl_disable_dc6(dev_priv);
618 * DDI buffer programming unnecessary during driver-load/resume
619 * as it's already done during modeset initialization then.
620 * It's also invalid here as encoder list is still uninitialized.
622 if (!dev_priv->power_domains.initializing)
623 intel_prepare_ddi(dev);
625 gen9_disable_dc5(dev_priv);
628 I915_WRITE(HSW_PWR_WELL_DRIVER, tmp | req_mask);
632 DRM_DEBUG_KMS("Enabling %s\n", power_well->name);
633 if (wait_for((I915_READ(HSW_PWR_WELL_DRIVER) &
635 DRM_ERROR("%s enable timeout\n",
637 check_fuse_status = true;
640 if (enable_requested) {
641 I915_WRITE(HSW_PWR_WELL_DRIVER, tmp & ~req_mask);
642 POSTING_READ(HSW_PWR_WELL_DRIVER);
643 DRM_DEBUG_KMS("Disabling %s\n", power_well->name);
645 if ((GEN9_ENABLE_DC5(dev) || SKL_ENABLE_DC6(dev)) &&
646 power_well->data == SKL_DISP_PW_2) {
647 enum csr_state state;
648 /* TODO: wait for a completion event or
649 * similar here instead of busy
650 * waiting using wait_for function.
652 wait_for((state = intel_csr_load_status_get(dev_priv)) !=
653 FW_UNINITIALIZED, 1000);
654 if (state != FW_LOADED)
655 DRM_ERROR("CSR firmware not ready (%d)\n",
658 if (SKL_ENABLE_DC6(dev))
659 skl_enable_dc6(dev_priv);
661 gen9_enable_dc5(dev_priv);
666 if (check_fuse_status) {
667 if (power_well->data == SKL_DISP_PW_1) {
668 if (wait_for((I915_READ(SKL_FUSE_STATUS) &
669 SKL_FUSE_PG1_DIST_STATUS), 1))
670 DRM_ERROR("PG1 distributing status timeout\n");
671 } else if (power_well->data == SKL_DISP_PW_2) {
672 if (wait_for((I915_READ(SKL_FUSE_STATUS) &
673 SKL_FUSE_PG2_DIST_STATUS), 1))
674 DRM_ERROR("PG2 distributing status timeout\n");
678 if (enable && !is_enabled)
679 skl_power_well_post_enable(dev_priv, power_well);
682 static void hsw_power_well_sync_hw(struct drm_i915_private *dev_priv,
683 struct i915_power_well *power_well)
685 hsw_set_power_well(dev_priv, power_well, power_well->count > 0);
688 * We're taking over the BIOS, so clear any requests made by it since
689 * the driver is in charge now.
691 if (I915_READ(HSW_PWR_WELL_BIOS) & HSW_PWR_WELL_ENABLE_REQUEST)
692 I915_WRITE(HSW_PWR_WELL_BIOS, 0);
695 static void hsw_power_well_enable(struct drm_i915_private *dev_priv,
696 struct i915_power_well *power_well)
698 hsw_set_power_well(dev_priv, power_well, true);
701 static void hsw_power_well_disable(struct drm_i915_private *dev_priv,
702 struct i915_power_well *power_well)
704 hsw_set_power_well(dev_priv, power_well, false);
707 static bool skl_power_well_enabled(struct drm_i915_private *dev_priv,
708 struct i915_power_well *power_well)
710 uint32_t mask = SKL_POWER_WELL_REQ(power_well->data) |
711 SKL_POWER_WELL_STATE(power_well->data);
713 return (I915_READ(HSW_PWR_WELL_DRIVER) & mask) == mask;
716 static void skl_power_well_sync_hw(struct drm_i915_private *dev_priv,
717 struct i915_power_well *power_well)
719 skl_set_power_well(dev_priv, power_well, power_well->count > 0);
721 /* Clear any request made by BIOS as driver is taking over */
722 I915_WRITE(HSW_PWR_WELL_BIOS, 0);
725 static void skl_power_well_enable(struct drm_i915_private *dev_priv,
726 struct i915_power_well *power_well)
728 skl_set_power_well(dev_priv, power_well, true);
731 static void skl_power_well_disable(struct drm_i915_private *dev_priv,
732 struct i915_power_well *power_well)
734 skl_set_power_well(dev_priv, power_well, false);
737 static void i9xx_always_on_power_well_noop(struct drm_i915_private *dev_priv,
738 struct i915_power_well *power_well)
742 static bool i9xx_always_on_power_well_enabled(struct drm_i915_private *dev_priv,
743 struct i915_power_well *power_well)
748 static void vlv_set_power_well(struct drm_i915_private *dev_priv,
749 struct i915_power_well *power_well, bool enable)
751 enum punit_power_well power_well_id = power_well->data;
756 mask = PUNIT_PWRGT_MASK(power_well_id);
757 state = enable ? PUNIT_PWRGT_PWR_ON(power_well_id) :
758 PUNIT_PWRGT_PWR_GATE(power_well_id);
760 mutex_lock(&dev_priv->rps.hw_lock);
763 ((vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_STATUS) & mask) == state)
768 ctrl = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_CTRL);
771 vlv_punit_write(dev_priv, PUNIT_REG_PWRGT_CTRL, ctrl);
773 if (wait_for(COND, 100))
774 DRM_ERROR("timout setting power well state %08x (%08x)\n",
776 vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_CTRL));
781 mutex_unlock(&dev_priv->rps.hw_lock);
784 static void vlv_power_well_sync_hw(struct drm_i915_private *dev_priv,
785 struct i915_power_well *power_well)
787 vlv_set_power_well(dev_priv, power_well, power_well->count > 0);
790 static void vlv_power_well_enable(struct drm_i915_private *dev_priv,
791 struct i915_power_well *power_well)
793 vlv_set_power_well(dev_priv, power_well, true);
796 static void vlv_power_well_disable(struct drm_i915_private *dev_priv,
797 struct i915_power_well *power_well)
799 vlv_set_power_well(dev_priv, power_well, false);
802 static bool vlv_power_well_enabled(struct drm_i915_private *dev_priv,
803 struct i915_power_well *power_well)
805 int power_well_id = power_well->data;
806 bool enabled = false;
811 mask = PUNIT_PWRGT_MASK(power_well_id);
812 ctrl = PUNIT_PWRGT_PWR_ON(power_well_id);
814 mutex_lock(&dev_priv->rps.hw_lock);
816 state = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_STATUS) & mask;
818 * We only ever set the power-on and power-gate states, anything
819 * else is unexpected.
821 WARN_ON(state != PUNIT_PWRGT_PWR_ON(power_well_id) &&
822 state != PUNIT_PWRGT_PWR_GATE(power_well_id));
827 * A transient state at this point would mean some unexpected party
828 * is poking at the power controls too.
830 ctrl = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_CTRL) & mask;
831 WARN_ON(ctrl != state);
833 mutex_unlock(&dev_priv->rps.hw_lock);
838 static void vlv_display_power_well_enable(struct drm_i915_private *dev_priv,
839 struct i915_power_well *power_well)
841 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DISP2D);
843 vlv_set_power_well(dev_priv, power_well, true);
845 spin_lock_irq(&dev_priv->irq_lock);
846 valleyview_enable_display_irqs(dev_priv);
847 spin_unlock_irq(&dev_priv->irq_lock);
850 * During driver initialization/resume we can avoid restoring the
851 * part of the HW/SW state that will be inited anyway explicitly.
853 if (dev_priv->power_domains.initializing)
856 intel_hpd_init(dev_priv);
858 i915_redisable_vga_power_on(dev_priv->dev);
861 static void vlv_display_power_well_disable(struct drm_i915_private *dev_priv,
862 struct i915_power_well *power_well)
864 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DISP2D);
866 spin_lock_irq(&dev_priv->irq_lock);
867 valleyview_disable_display_irqs(dev_priv);
868 spin_unlock_irq(&dev_priv->irq_lock);
870 vlv_set_power_well(dev_priv, power_well, false);
872 vlv_power_sequencer_reset(dev_priv);
875 static void vlv_dpio_cmn_power_well_enable(struct drm_i915_private *dev_priv,
876 struct i915_power_well *power_well)
878 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC);
881 * Enable the CRI clock source so we can get at the
882 * display and the reference clock for VGA
883 * hotplug / manual detection.
885 I915_WRITE(DPLL(PIPE_B), I915_READ(DPLL(PIPE_B)) |
886 DPLL_REFA_CLK_ENABLE_VLV | DPLL_INTEGRATED_CRI_CLK_VLV);
887 udelay(1); /* >10ns for cmnreset, >0ns for sidereset */
889 vlv_set_power_well(dev_priv, power_well, true);
892 * From VLV2A0_DP_eDP_DPIO_driver_vbios_notes_10.docx -
893 * 6. De-assert cmn_reset/side_reset. Same as VLV X0.
894 * a. GUnit 0x2110 bit[0] set to 1 (def 0)
895 * b. The other bits such as sfr settings / modesel may all
898 * This should only be done on init and resume from S3 with
899 * both PLLs disabled, or we risk losing DPIO and PLL
902 I915_WRITE(DPIO_CTL, I915_READ(DPIO_CTL) | DPIO_CMNRST);
905 static void vlv_dpio_cmn_power_well_disable(struct drm_i915_private *dev_priv,
906 struct i915_power_well *power_well)
910 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC);
912 for_each_pipe(dev_priv, pipe)
913 assert_pll_disabled(dev_priv, pipe);
915 /* Assert common reset */
916 I915_WRITE(DPIO_CTL, I915_READ(DPIO_CTL) & ~DPIO_CMNRST);
918 vlv_set_power_well(dev_priv, power_well, false);
921 static void chv_dpio_cmn_power_well_enable(struct drm_i915_private *dev_priv,
922 struct i915_power_well *power_well)
926 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC &&
927 power_well->data != PUNIT_POWER_WELL_DPIO_CMN_D);
930 * Enable the CRI clock source so we can get at the
931 * display and the reference clock for VGA
932 * hotplug / manual detection.
934 if (power_well->data == PUNIT_POWER_WELL_DPIO_CMN_BC) {
936 I915_WRITE(DPLL(PIPE_B), I915_READ(DPLL(PIPE_B)) |
937 DPLL_REFA_CLK_ENABLE_VLV);
938 I915_WRITE(DPLL(PIPE_B), I915_READ(DPLL(PIPE_B)) |
939 DPLL_REFA_CLK_ENABLE_VLV | DPLL_INTEGRATED_CRI_CLK_VLV);
942 I915_WRITE(DPLL(PIPE_C), I915_READ(DPLL(PIPE_C)) |
943 DPLL_REFA_CLK_ENABLE_VLV | DPLL_INTEGRATED_CRI_CLK_VLV);
945 udelay(1); /* >10ns for cmnreset, >0ns for sidereset */
946 vlv_set_power_well(dev_priv, power_well, true);
948 /* Poll for phypwrgood signal */
949 if (wait_for(I915_READ(DISPLAY_PHY_STATUS) & PHY_POWERGOOD(phy), 1))
950 DRM_ERROR("Display PHY %d is not power up\n", phy);
952 dev_priv->chv_phy_control |= PHY_COM_LANE_RESET_DEASSERT(phy);
953 I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control);
956 static void chv_dpio_cmn_power_well_disable(struct drm_i915_private *dev_priv,
957 struct i915_power_well *power_well)
961 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC &&
962 power_well->data != PUNIT_POWER_WELL_DPIO_CMN_D);
964 if (power_well->data == PUNIT_POWER_WELL_DPIO_CMN_BC) {
966 assert_pll_disabled(dev_priv, PIPE_A);
967 assert_pll_disabled(dev_priv, PIPE_B);
970 assert_pll_disabled(dev_priv, PIPE_C);
973 dev_priv->chv_phy_control &= ~PHY_COM_LANE_RESET_DEASSERT(phy);
974 I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control);
976 vlv_set_power_well(dev_priv, power_well, false);
979 static bool chv_pipe_power_well_enabled(struct drm_i915_private *dev_priv,
980 struct i915_power_well *power_well)
982 enum pipe pipe = power_well->data;
986 mutex_lock(&dev_priv->rps.hw_lock);
988 state = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) & DP_SSS_MASK(pipe);
990 * We only ever set the power-on and power-gate states, anything
991 * else is unexpected.
993 WARN_ON(state != DP_SSS_PWR_ON(pipe) && state != DP_SSS_PWR_GATE(pipe));
994 enabled = state == DP_SSS_PWR_ON(pipe);
997 * A transient state at this point would mean some unexpected party
998 * is poking at the power controls too.
1000 ctrl = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) & DP_SSC_MASK(pipe);
1001 WARN_ON(ctrl << 16 != state);
1003 mutex_unlock(&dev_priv->rps.hw_lock);
1008 static void chv_set_pipe_power_well(struct drm_i915_private *dev_priv,
1009 struct i915_power_well *power_well,
1012 enum pipe pipe = power_well->data;
1016 state = enable ? DP_SSS_PWR_ON(pipe) : DP_SSS_PWR_GATE(pipe);
1018 mutex_lock(&dev_priv->rps.hw_lock);
1021 ((vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) & DP_SSS_MASK(pipe)) == state)
1026 ctrl = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ);
1027 ctrl &= ~DP_SSC_MASK(pipe);
1028 ctrl |= enable ? DP_SSC_PWR_ON(pipe) : DP_SSC_PWR_GATE(pipe);
1029 vlv_punit_write(dev_priv, PUNIT_REG_DSPFREQ, ctrl);
1031 if (wait_for(COND, 100))
1032 DRM_ERROR("timout setting power well state %08x (%08x)\n",
1034 vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ));
1039 mutex_unlock(&dev_priv->rps.hw_lock);
1042 static void chv_pipe_power_well_sync_hw(struct drm_i915_private *dev_priv,
1043 struct i915_power_well *power_well)
1045 chv_set_pipe_power_well(dev_priv, power_well, power_well->count > 0);
1048 static void chv_pipe_power_well_enable(struct drm_i915_private *dev_priv,
1049 struct i915_power_well *power_well)
1051 WARN_ON_ONCE(power_well->data != PIPE_A &&
1052 power_well->data != PIPE_B &&
1053 power_well->data != PIPE_C);
1055 chv_set_pipe_power_well(dev_priv, power_well, true);
1057 if (power_well->data == PIPE_A) {
1058 spin_lock_irq(&dev_priv->irq_lock);
1059 valleyview_enable_display_irqs(dev_priv);
1060 spin_unlock_irq(&dev_priv->irq_lock);
1063 * During driver initialization/resume we can avoid restoring the
1064 * part of the HW/SW state that will be inited anyway explicitly.
1066 if (dev_priv->power_domains.initializing)
1069 intel_hpd_init(dev_priv);
1071 i915_redisable_vga_power_on(dev_priv->dev);
1075 static void chv_pipe_power_well_disable(struct drm_i915_private *dev_priv,
1076 struct i915_power_well *power_well)
1078 WARN_ON_ONCE(power_well->data != PIPE_A &&
1079 power_well->data != PIPE_B &&
1080 power_well->data != PIPE_C);
1082 if (power_well->data == PIPE_A) {
1083 spin_lock_irq(&dev_priv->irq_lock);
1084 valleyview_disable_display_irqs(dev_priv);
1085 spin_unlock_irq(&dev_priv->irq_lock);
1088 chv_set_pipe_power_well(dev_priv, power_well, false);
1090 if (power_well->data == PIPE_A)
1091 vlv_power_sequencer_reset(dev_priv);
1095 * intel_display_power_get - grab a power domain reference
1096 * @dev_priv: i915 device instance
1097 * @domain: power domain to reference
1099 * This function grabs a power domain reference for @domain and ensures that the
1100 * power domain and all its parents are powered up. Therefore users should only
1101 * grab a reference to the innermost power domain they need.
1103 * Any power domain reference obtained by this function must have a symmetric
1104 * call to intel_display_power_put() to release the reference again.
1106 void intel_display_power_get(struct drm_i915_private *dev_priv,
1107 enum intel_display_power_domain domain)
1109 struct i915_power_domains *power_domains;
1110 struct i915_power_well *power_well;
1113 intel_runtime_pm_get(dev_priv);
1115 power_domains = &dev_priv->power_domains;
1117 mutex_lock(&power_domains->lock);
1119 for_each_power_well(i, power_well, BIT(domain), power_domains) {
1120 if (!power_well->count++) {
1121 DRM_DEBUG_KMS("enabling %s\n", power_well->name);
1122 power_well->ops->enable(dev_priv, power_well);
1123 power_well->hw_enabled = true;
1127 power_domains->domain_use_count[domain]++;
1129 mutex_unlock(&power_domains->lock);
1133 * intel_display_power_put - release a power domain reference
1134 * @dev_priv: i915 device instance
1135 * @domain: power domain to reference
1137 * This function drops the power domain reference obtained by
1138 * intel_display_power_get() and might power down the corresponding hardware
1139 * block right away if this is the last reference.
1141 void intel_display_power_put(struct drm_i915_private *dev_priv,
1142 enum intel_display_power_domain domain)
1144 struct i915_power_domains *power_domains;
1145 struct i915_power_well *power_well;
1148 power_domains = &dev_priv->power_domains;
1150 mutex_lock(&power_domains->lock);
1152 WARN_ON(!power_domains->domain_use_count[domain]);
1153 power_domains->domain_use_count[domain]--;
1155 for_each_power_well_rev(i, power_well, BIT(domain), power_domains) {
1156 WARN_ON(!power_well->count);
1158 if (!--power_well->count && i915.disable_power_well) {
1159 DRM_DEBUG_KMS("disabling %s\n", power_well->name);
1160 power_well->hw_enabled = false;
1161 power_well->ops->disable(dev_priv, power_well);
1165 mutex_unlock(&power_domains->lock);
1167 intel_runtime_pm_put(dev_priv);
1170 #define POWER_DOMAIN_MASK (BIT(POWER_DOMAIN_NUM) - 1)
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))
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))
1201 #define VLV_ALWAYS_ON_POWER_DOMAINS BIT(POWER_DOMAIN_INIT)
1202 #define VLV_DISPLAY_POWER_DOMAINS POWER_DOMAIN_MASK
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))
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))
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))
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))
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))
1236 #define CHV_PIPE_A_POWER_DOMAINS ( \
1237 BIT(POWER_DOMAIN_PIPE_A) | \
1238 BIT(POWER_DOMAIN_INIT))
1240 #define CHV_PIPE_B_POWER_DOMAINS ( \
1241 BIT(POWER_DOMAIN_PIPE_B) | \
1242 BIT(POWER_DOMAIN_INIT))
1244 #define CHV_PIPE_C_POWER_DOMAINS ( \
1245 BIT(POWER_DOMAIN_PIPE_C) | \
1246 BIT(POWER_DOMAIN_INIT))
1248 #define CHV_DPIO_CMN_BC_POWER_DOMAINS ( \
1249 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \
1250 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \
1251 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \
1252 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \
1253 BIT(POWER_DOMAIN_AUX_B) | \
1254 BIT(POWER_DOMAIN_AUX_C) | \
1255 BIT(POWER_DOMAIN_INIT))
1257 #define CHV_DPIO_CMN_D_POWER_DOMAINS ( \
1258 BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) | \
1259 BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) | \
1260 BIT(POWER_DOMAIN_AUX_D) | \
1261 BIT(POWER_DOMAIN_INIT))
1263 #define CHV_DPIO_TX_D_LANES_01_POWER_DOMAINS ( \
1264 BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) | \
1265 BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) | \
1266 BIT(POWER_DOMAIN_AUX_D) | \
1267 BIT(POWER_DOMAIN_INIT))
1269 #define CHV_DPIO_TX_D_LANES_23_POWER_DOMAINS ( \
1270 BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) | \
1271 BIT(POWER_DOMAIN_AUX_D) | \
1272 BIT(POWER_DOMAIN_INIT))
1274 static const struct i915_power_well_ops i9xx_always_on_power_well_ops = {
1275 .sync_hw = i9xx_always_on_power_well_noop,
1276 .enable = i9xx_always_on_power_well_noop,
1277 .disable = i9xx_always_on_power_well_noop,
1278 .is_enabled = i9xx_always_on_power_well_enabled,
1281 static const struct i915_power_well_ops chv_pipe_power_well_ops = {
1282 .sync_hw = chv_pipe_power_well_sync_hw,
1283 .enable = chv_pipe_power_well_enable,
1284 .disable = chv_pipe_power_well_disable,
1285 .is_enabled = chv_pipe_power_well_enabled,
1288 static const struct i915_power_well_ops chv_dpio_cmn_power_well_ops = {
1289 .sync_hw = vlv_power_well_sync_hw,
1290 .enable = chv_dpio_cmn_power_well_enable,
1291 .disable = chv_dpio_cmn_power_well_disable,
1292 .is_enabled = vlv_power_well_enabled,
1295 static struct i915_power_well i9xx_always_on_power_well[] = {
1297 .name = "always-on",
1299 .domains = POWER_DOMAIN_MASK,
1300 .ops = &i9xx_always_on_power_well_ops,
1304 static const struct i915_power_well_ops hsw_power_well_ops = {
1305 .sync_hw = hsw_power_well_sync_hw,
1306 .enable = hsw_power_well_enable,
1307 .disable = hsw_power_well_disable,
1308 .is_enabled = hsw_power_well_enabled,
1311 static const struct i915_power_well_ops skl_power_well_ops = {
1312 .sync_hw = skl_power_well_sync_hw,
1313 .enable = skl_power_well_enable,
1314 .disable = skl_power_well_disable,
1315 .is_enabled = skl_power_well_enabled,
1318 static struct i915_power_well hsw_power_wells[] = {
1320 .name = "always-on",
1322 .domains = HSW_ALWAYS_ON_POWER_DOMAINS,
1323 .ops = &i9xx_always_on_power_well_ops,
1327 .domains = HSW_DISPLAY_POWER_DOMAINS,
1328 .ops = &hsw_power_well_ops,
1332 static struct i915_power_well bdw_power_wells[] = {
1334 .name = "always-on",
1336 .domains = BDW_ALWAYS_ON_POWER_DOMAINS,
1337 .ops = &i9xx_always_on_power_well_ops,
1341 .domains = BDW_DISPLAY_POWER_DOMAINS,
1342 .ops = &hsw_power_well_ops,
1346 static const struct i915_power_well_ops vlv_display_power_well_ops = {
1347 .sync_hw = vlv_power_well_sync_hw,
1348 .enable = vlv_display_power_well_enable,
1349 .disable = vlv_display_power_well_disable,
1350 .is_enabled = vlv_power_well_enabled,
1353 static const struct i915_power_well_ops vlv_dpio_cmn_power_well_ops = {
1354 .sync_hw = vlv_power_well_sync_hw,
1355 .enable = vlv_dpio_cmn_power_well_enable,
1356 .disable = vlv_dpio_cmn_power_well_disable,
1357 .is_enabled = vlv_power_well_enabled,
1360 static const struct i915_power_well_ops vlv_dpio_power_well_ops = {
1361 .sync_hw = vlv_power_well_sync_hw,
1362 .enable = vlv_power_well_enable,
1363 .disable = vlv_power_well_disable,
1364 .is_enabled = vlv_power_well_enabled,
1367 static struct i915_power_well vlv_power_wells[] = {
1369 .name = "always-on",
1371 .domains = VLV_ALWAYS_ON_POWER_DOMAINS,
1372 .ops = &i9xx_always_on_power_well_ops,
1376 .domains = VLV_DISPLAY_POWER_DOMAINS,
1377 .data = PUNIT_POWER_WELL_DISP2D,
1378 .ops = &vlv_display_power_well_ops,
1381 .name = "dpio-tx-b-01",
1382 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS |
1383 VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS |
1384 VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS |
1385 VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
1386 .ops = &vlv_dpio_power_well_ops,
1387 .data = PUNIT_POWER_WELL_DPIO_TX_B_LANES_01,
1390 .name = "dpio-tx-b-23",
1391 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS |
1392 VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS |
1393 VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS |
1394 VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
1395 .ops = &vlv_dpio_power_well_ops,
1396 .data = PUNIT_POWER_WELL_DPIO_TX_B_LANES_23,
1399 .name = "dpio-tx-c-01",
1400 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS |
1401 VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS |
1402 VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS |
1403 VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
1404 .ops = &vlv_dpio_power_well_ops,
1405 .data = PUNIT_POWER_WELL_DPIO_TX_C_LANES_01,
1408 .name = "dpio-tx-c-23",
1409 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS |
1410 VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS |
1411 VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS |
1412 VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
1413 .ops = &vlv_dpio_power_well_ops,
1414 .data = PUNIT_POWER_WELL_DPIO_TX_C_LANES_23,
1417 .name = "dpio-common",
1418 .domains = VLV_DPIO_CMN_BC_POWER_DOMAINS,
1419 .data = PUNIT_POWER_WELL_DPIO_CMN_BC,
1420 .ops = &vlv_dpio_cmn_power_well_ops,
1424 static struct i915_power_well chv_power_wells[] = {
1426 .name = "always-on",
1428 .domains = VLV_ALWAYS_ON_POWER_DOMAINS,
1429 .ops = &i9xx_always_on_power_well_ops,
1434 .domains = VLV_DISPLAY_POWER_DOMAINS,
1435 .data = PUNIT_POWER_WELL_DISP2D,
1436 .ops = &vlv_display_power_well_ops,
1442 * FIXME: pipe A power well seems to be the new disp2d well.
1443 * At least all registers seem to be housed there. Figure
1444 * out if this a a temporary situation in pre-production
1445 * hardware or a permanent state of affairs.
1447 .domains = CHV_PIPE_A_POWER_DOMAINS | VLV_DISPLAY_POWER_DOMAINS,
1449 .ops = &chv_pipe_power_well_ops,
1454 .domains = CHV_PIPE_B_POWER_DOMAINS,
1456 .ops = &chv_pipe_power_well_ops,
1460 .domains = CHV_PIPE_C_POWER_DOMAINS,
1462 .ops = &chv_pipe_power_well_ops,
1466 .name = "dpio-common-bc",
1468 * XXX: cmnreset for one PHY seems to disturb the other.
1469 * As a workaround keep both powered on at the same
1472 .domains = CHV_DPIO_CMN_BC_POWER_DOMAINS | CHV_DPIO_CMN_D_POWER_DOMAINS,
1473 .data = PUNIT_POWER_WELL_DPIO_CMN_BC,
1474 .ops = &chv_dpio_cmn_power_well_ops,
1477 .name = "dpio-common-d",
1479 * XXX: cmnreset for one PHY seems to disturb the other.
1480 * As a workaround keep both powered on at the same
1483 .domains = CHV_DPIO_CMN_BC_POWER_DOMAINS | CHV_DPIO_CMN_D_POWER_DOMAINS,
1484 .data = PUNIT_POWER_WELL_DPIO_CMN_D,
1485 .ops = &chv_dpio_cmn_power_well_ops,
1489 .name = "dpio-tx-b-01",
1490 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS |
1491 VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS,
1492 .ops = &vlv_dpio_power_well_ops,
1493 .data = PUNIT_POWER_WELL_DPIO_TX_B_LANES_01,
1496 .name = "dpio-tx-b-23",
1497 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS |
1498 VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS,
1499 .ops = &vlv_dpio_power_well_ops,
1500 .data = PUNIT_POWER_WELL_DPIO_TX_B_LANES_23,
1503 .name = "dpio-tx-c-01",
1504 .domains = VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS |
1505 VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
1506 .ops = &vlv_dpio_power_well_ops,
1507 .data = PUNIT_POWER_WELL_DPIO_TX_C_LANES_01,
1510 .name = "dpio-tx-c-23",
1511 .domains = VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS |
1512 VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
1513 .ops = &vlv_dpio_power_well_ops,
1514 .data = PUNIT_POWER_WELL_DPIO_TX_C_LANES_23,
1517 .name = "dpio-tx-d-01",
1518 .domains = CHV_DPIO_TX_D_LANES_01_POWER_DOMAINS |
1519 CHV_DPIO_TX_D_LANES_23_POWER_DOMAINS,
1520 .ops = &vlv_dpio_power_well_ops,
1521 .data = PUNIT_POWER_WELL_DPIO_TX_D_LANES_01,
1524 .name = "dpio-tx-d-23",
1525 .domains = CHV_DPIO_TX_D_LANES_01_POWER_DOMAINS |
1526 CHV_DPIO_TX_D_LANES_23_POWER_DOMAINS,
1527 .ops = &vlv_dpio_power_well_ops,
1528 .data = PUNIT_POWER_WELL_DPIO_TX_D_LANES_23,
1533 static struct i915_power_well *lookup_power_well(struct drm_i915_private *dev_priv,
1536 struct i915_power_domains *power_domains = &dev_priv->power_domains;
1537 struct i915_power_well *power_well;
1540 for_each_power_well(i, power_well, POWER_DOMAIN_MASK, power_domains) {
1541 if (power_well->data == power_well_id)
1548 bool intel_display_power_well_is_enabled(struct drm_i915_private *dev_priv,
1551 struct i915_power_well *power_well;
1554 power_well = lookup_power_well(dev_priv, power_well_id);
1555 ret = power_well->ops->is_enabled(dev_priv, power_well);
1560 static struct i915_power_well skl_power_wells[] = {
1562 .name = "always-on",
1564 .domains = SKL_DISPLAY_ALWAYS_ON_POWER_DOMAINS,
1565 .ops = &i9xx_always_on_power_well_ops,
1568 .name = "power well 1",
1569 .domains = SKL_DISPLAY_POWERWELL_1_POWER_DOMAINS,
1570 .ops = &skl_power_well_ops,
1571 .data = SKL_DISP_PW_1,
1574 .name = "MISC IO power well",
1575 .domains = SKL_DISPLAY_MISC_IO_POWER_DOMAINS,
1576 .ops = &skl_power_well_ops,
1577 .data = SKL_DISP_PW_MISC_IO,
1580 .name = "power well 2",
1581 .domains = SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS,
1582 .ops = &skl_power_well_ops,
1583 .data = SKL_DISP_PW_2,
1586 .name = "DDI A/E power well",
1587 .domains = SKL_DISPLAY_DDI_A_E_POWER_DOMAINS,
1588 .ops = &skl_power_well_ops,
1589 .data = SKL_DISP_PW_DDI_A_E,
1592 .name = "DDI B power well",
1593 .domains = SKL_DISPLAY_DDI_B_POWER_DOMAINS,
1594 .ops = &skl_power_well_ops,
1595 .data = SKL_DISP_PW_DDI_B,
1598 .name = "DDI C power well",
1599 .domains = SKL_DISPLAY_DDI_C_POWER_DOMAINS,
1600 .ops = &skl_power_well_ops,
1601 .data = SKL_DISP_PW_DDI_C,
1604 .name = "DDI D power well",
1605 .domains = SKL_DISPLAY_DDI_D_POWER_DOMAINS,
1606 .ops = &skl_power_well_ops,
1607 .data = SKL_DISP_PW_DDI_D,
1611 static struct i915_power_well bxt_power_wells[] = {
1613 .name = "always-on",
1615 .domains = BXT_DISPLAY_ALWAYS_ON_POWER_DOMAINS,
1616 .ops = &i9xx_always_on_power_well_ops,
1619 .name = "power well 1",
1620 .domains = BXT_DISPLAY_POWERWELL_1_POWER_DOMAINS,
1621 .ops = &skl_power_well_ops,
1622 .data = SKL_DISP_PW_1,
1625 .name = "power well 2",
1626 .domains = BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS,
1627 .ops = &skl_power_well_ops,
1628 .data = SKL_DISP_PW_2,
1632 #define set_power_wells(power_domains, __power_wells) ({ \
1633 (power_domains)->power_wells = (__power_wells); \
1634 (power_domains)->power_well_count = ARRAY_SIZE(__power_wells); \
1638 * intel_power_domains_init - initializes the power domain structures
1639 * @dev_priv: i915 device instance
1641 * Initializes the power domain structures for @dev_priv depending upon the
1642 * supported platform.
1644 int intel_power_domains_init(struct drm_i915_private *dev_priv)
1646 struct i915_power_domains *power_domains = &dev_priv->power_domains;
1648 mutex_init(&power_domains->lock);
1651 * The enabling order will be from lower to higher indexed wells,
1652 * the disabling order is reversed.
1654 if (IS_HASWELL(dev_priv->dev)) {
1655 set_power_wells(power_domains, hsw_power_wells);
1656 } else if (IS_BROADWELL(dev_priv->dev)) {
1657 set_power_wells(power_domains, bdw_power_wells);
1658 } else if (IS_SKYLAKE(dev_priv->dev)) {
1659 set_power_wells(power_domains, skl_power_wells);
1660 } else if (IS_BROXTON(dev_priv->dev)) {
1661 set_power_wells(power_domains, bxt_power_wells);
1662 } else if (IS_CHERRYVIEW(dev_priv->dev)) {
1663 set_power_wells(power_domains, chv_power_wells);
1664 } else if (IS_VALLEYVIEW(dev_priv->dev)) {
1665 set_power_wells(power_domains, vlv_power_wells);
1667 set_power_wells(power_domains, i9xx_always_on_power_well);
1673 static void intel_runtime_pm_disable(struct drm_i915_private *dev_priv)
1675 struct drm_device *dev = dev_priv->dev;
1676 struct device *device = &dev->pdev->dev;
1678 if (!HAS_RUNTIME_PM(dev))
1681 if (!intel_enable_rc6(dev))
1684 /* Make sure we're not suspended first. */
1685 pm_runtime_get_sync(device);
1686 pm_runtime_disable(device);
1690 * intel_power_domains_fini - finalizes the power domain structures
1691 * @dev_priv: i915 device instance
1693 * Finalizes the power domain structures for @dev_priv depending upon the
1694 * supported platform. This function also disables runtime pm and ensures that
1695 * the device stays powered up so that the driver can be reloaded.
1697 void intel_power_domains_fini(struct drm_i915_private *dev_priv)
1699 intel_runtime_pm_disable(dev_priv);
1701 /* The i915.ko module is still not prepared to be loaded when
1702 * the power well is not enabled, so just enable it in case
1703 * we're going to unload/reload. */
1704 intel_display_set_init_power(dev_priv, true);
1707 static void intel_power_domains_resume(struct drm_i915_private *dev_priv)
1709 struct i915_power_domains *power_domains = &dev_priv->power_domains;
1710 struct i915_power_well *power_well;
1713 mutex_lock(&power_domains->lock);
1714 for_each_power_well(i, power_well, POWER_DOMAIN_MASK, power_domains) {
1715 power_well->ops->sync_hw(dev_priv, power_well);
1716 power_well->hw_enabled = power_well->ops->is_enabled(dev_priv,
1719 mutex_unlock(&power_domains->lock);
1722 static void chv_phy_control_init(struct drm_i915_private *dev_priv)
1724 struct i915_power_well *cmn_bc =
1725 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_BC);
1726 struct i915_power_well *cmn_d =
1727 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_D);
1730 * DISPLAY_PHY_CONTROL can get corrupted if read. As a
1731 * workaround never ever read DISPLAY_PHY_CONTROL, and
1732 * instead maintain a shadow copy ourselves. Use the actual
1733 * power well state to reconstruct the expected initial
1736 dev_priv->chv_phy_control =
1737 PHY_CH_POWER_MODE(PHY_CH_SU_PSR, DPIO_PHY0, DPIO_CH0) |
1738 PHY_CH_POWER_MODE(PHY_CH_SU_PSR, DPIO_PHY0, DPIO_CH1) |
1739 PHY_CH_POWER_MODE(PHY_CH_SU_PSR, DPIO_PHY1, DPIO_CH0);
1740 if (cmn_bc->ops->is_enabled(dev_priv, cmn_bc))
1741 dev_priv->chv_phy_control |= PHY_COM_LANE_RESET_DEASSERT(DPIO_PHY0);
1742 if (cmn_d->ops->is_enabled(dev_priv, cmn_d))
1743 dev_priv->chv_phy_control |= PHY_COM_LANE_RESET_DEASSERT(DPIO_PHY1);
1746 static void vlv_cmnlane_wa(struct drm_i915_private *dev_priv)
1748 struct i915_power_well *cmn =
1749 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_BC);
1750 struct i915_power_well *disp2d =
1751 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DISP2D);
1753 /* If the display might be already active skip this */
1754 if (cmn->ops->is_enabled(dev_priv, cmn) &&
1755 disp2d->ops->is_enabled(dev_priv, disp2d) &&
1756 I915_READ(DPIO_CTL) & DPIO_CMNRST)
1759 DRM_DEBUG_KMS("toggling display PHY side reset\n");
1761 /* cmnlane needs DPLL registers */
1762 disp2d->ops->enable(dev_priv, disp2d);
1765 * From VLV2A0_DP_eDP_HDMI_DPIO_driver_vbios_notes_11.docx:
1766 * Need to assert and de-assert PHY SB reset by gating the
1767 * common lane power, then un-gating it.
1768 * Simply ungating isn't enough to reset the PHY enough to get
1769 * ports and lanes running.
1771 cmn->ops->disable(dev_priv, cmn);
1775 * intel_power_domains_init_hw - initialize hardware power domain state
1776 * @dev_priv: i915 device instance
1778 * This function initializes the hardware power domain state and enables all
1779 * power domains using intel_display_set_init_power().
1781 void intel_power_domains_init_hw(struct drm_i915_private *dev_priv)
1783 struct drm_device *dev = dev_priv->dev;
1784 struct i915_power_domains *power_domains = &dev_priv->power_domains;
1786 power_domains->initializing = true;
1788 if (IS_CHERRYVIEW(dev)) {
1789 chv_phy_control_init(dev_priv);
1790 } else if (IS_VALLEYVIEW(dev)) {
1791 mutex_lock(&power_domains->lock);
1792 vlv_cmnlane_wa(dev_priv);
1793 mutex_unlock(&power_domains->lock);
1796 /* For now, we need the power well to be always enabled. */
1797 intel_display_set_init_power(dev_priv, true);
1798 intel_power_domains_resume(dev_priv);
1799 power_domains->initializing = false;
1803 * intel_aux_display_runtime_get - grab an auxiliary power domain reference
1804 * @dev_priv: i915 device instance
1806 * This function grabs a power domain reference for the auxiliary power domain
1807 * (for access to the GMBUS and DP AUX blocks) and ensures that it and all its
1808 * parents are powered up. Therefore users should only grab a reference to the
1809 * innermost power domain they need.
1811 * Any power domain reference obtained by this function must have a symmetric
1812 * call to intel_aux_display_runtime_put() to release the reference again.
1814 void intel_aux_display_runtime_get(struct drm_i915_private *dev_priv)
1816 intel_runtime_pm_get(dev_priv);
1820 * intel_aux_display_runtime_put - release an auxiliary power domain reference
1821 * @dev_priv: i915 device instance
1823 * This function drops the auxiliary power domain reference obtained by
1824 * intel_aux_display_runtime_get() and might power down the corresponding
1825 * hardware block right away if this is the last reference.
1827 void intel_aux_display_runtime_put(struct drm_i915_private *dev_priv)
1829 intel_runtime_pm_put(dev_priv);
1833 * intel_runtime_pm_get - grab a runtime pm reference
1834 * @dev_priv: i915 device instance
1836 * This function grabs a device-level runtime pm reference (mostly used for GEM
1837 * code to ensure the GTT or GT is on) and ensures that it is powered up.
1839 * Any runtime pm reference obtained by this function must have a symmetric
1840 * call to intel_runtime_pm_put() to release the reference again.
1842 void intel_runtime_pm_get(struct drm_i915_private *dev_priv)
1844 struct drm_device *dev = dev_priv->dev;
1845 struct device *device = &dev->pdev->dev;
1847 if (!HAS_RUNTIME_PM(dev))
1850 pm_runtime_get_sync(device);
1851 WARN(dev_priv->pm.suspended, "Device still suspended.\n");
1855 * intel_runtime_pm_get_noresume - grab a runtime pm reference
1856 * @dev_priv: i915 device instance
1858 * This function grabs a device-level runtime pm reference (mostly used for GEM
1859 * code to ensure the GTT or GT is on).
1861 * It will _not_ power up the device but instead only check that it's powered
1862 * on. Therefore it is only valid to call this functions from contexts where
1863 * the device is known to be powered up and where trying to power it up would
1864 * result in hilarity and deadlocks. That pretty much means only the system
1865 * suspend/resume code where this is used to grab runtime pm references for
1866 * delayed setup down in work items.
1868 * Any runtime pm reference obtained by this function must have a symmetric
1869 * call to intel_runtime_pm_put() to release the reference again.
1871 void intel_runtime_pm_get_noresume(struct drm_i915_private *dev_priv)
1873 struct drm_device *dev = dev_priv->dev;
1874 struct device *device = &dev->pdev->dev;
1876 if (!HAS_RUNTIME_PM(dev))
1879 WARN(dev_priv->pm.suspended, "Getting nosync-ref while suspended.\n");
1880 pm_runtime_get_noresume(device);
1884 * intel_runtime_pm_put - release a runtime pm reference
1885 * @dev_priv: i915 device instance
1887 * This function drops the device-level runtime pm reference obtained by
1888 * intel_runtime_pm_get() and might power down the corresponding
1889 * hardware block right away if this is the last reference.
1891 void intel_runtime_pm_put(struct drm_i915_private *dev_priv)
1893 struct drm_device *dev = dev_priv->dev;
1894 struct device *device = &dev->pdev->dev;
1896 if (!HAS_RUNTIME_PM(dev))
1899 pm_runtime_mark_last_busy(device);
1900 pm_runtime_put_autosuspend(device);
1904 * intel_runtime_pm_enable - enable runtime pm
1905 * @dev_priv: i915 device instance
1907 * This function enables runtime pm at the end of the driver load sequence.
1909 * Note that this function does currently not enable runtime pm for the
1910 * subordinate display power domains. That is only done on the first modeset
1911 * using intel_display_set_init_power().
1913 void intel_runtime_pm_enable(struct drm_i915_private *dev_priv)
1915 struct drm_device *dev = dev_priv->dev;
1916 struct device *device = &dev->pdev->dev;
1918 if (!HAS_RUNTIME_PM(dev))
1921 pm_runtime_set_active(device);
1924 * RPM depends on RC6 to save restore the GT HW context, so make RC6 a
1927 if (!intel_enable_rc6(dev)) {
1928 DRM_INFO("RC6 disabled, disabling runtime PM support\n");
1932 pm_runtime_set_autosuspend_delay(device, 10000); /* 10s */
1933 pm_runtime_mark_last_busy(device);
1934 pm_runtime_use_autosuspend(device);
1936 pm_runtime_put_autosuspend(device);