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irqchip/ts4800: Add TS-4800 interrupt controller
[linux/fpc-iii.git] / drivers / gpu / drm / i915 / intel_runtime_pm.c
blob7e23d65c9b246ac6672ad432c0f4f4f38bab6254
1 /*
2 * Copyright © 2012-2014 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 *
23 * Authors:
24 * Eugeni Dodonov <eugeni.dodonov@intel.com>
25 * Daniel Vetter <daniel.vetter@ffwll.ch>
26 *
27 */
28
29 #include <linux/pm_runtime.h>
30 #include <linux/vgaarb.h>
31
32 #include "i915_drv.h"
33 #include "intel_drv.h"
34
35 /**
36 * DOC: runtime pm
37 *
38 * The i915 driver supports dynamic enabling and disabling of entire hardware
39 * blocks at runtime. This is especially important on the display side where
40 * software is supposed to control many power gates manually on recent hardware,
41 * since on the GT side a lot of the power management is done by the hardware.
42 * But even there some manual control at the device level is required.
43 *
44 * Since i915 supports a diverse set of platforms with a unified codebase and
45 * hardware engineers just love to shuffle functionality around between power
46 * domains there's a sizeable amount of indirection required. This file provides
47 * generic functions to the driver for grabbing and releasing references for
48 * abstract power domains. It then maps those to the actual power wells
49 * present for a given platform.
50 */
51
52 #define GEN9_ENABLE_DC5(dev) 0
53 #define SKL_ENABLE_DC6(dev) IS_SKYLAKE(dev)
54
55 #define for_each_power_well(i, power_well, domain_mask, power_domains) \
56 for (i = 0; \
57 i < (power_domains)->power_well_count && \
58 ((power_well) = &(power_domains)->power_wells[i]); \
59 i++) \
60 if ((power_well)->domains & (domain_mask))
61
62 #define for_each_power_well_rev(i, power_well, domain_mask, power_domains) \
63 for (i = (power_domains)->power_well_count - 1; \
64 i >= 0 && ((power_well) = &(power_domains)->power_wells[i]);\
65 i--) \
66 if ((power_well)->domains & (domain_mask))
67
68 bool intel_display_power_well_is_enabled(struct drm_i915_private *dev_priv,
69 int power_well_id);
70
71 static void intel_power_well_enable(struct drm_i915_private *dev_priv,
72 struct i915_power_well *power_well)
73 {
74 DRM_DEBUG_KMS("enabling %s\n", power_well->name);
75 power_well->ops->enable(dev_priv, power_well);
76 power_well->hw_enabled = true;
77 }
78
79 static void intel_power_well_disable(struct drm_i915_private *dev_priv,
80 struct i915_power_well *power_well)
81 {
82 DRM_DEBUG_KMS("disabling %s\n", power_well->name);
83 power_well->hw_enabled = false;
84 power_well->ops->disable(dev_priv, power_well);
85 }
86
87 /*
88 * We should only use the power well if we explicitly asked the hardware to
89 * enable it, so check if it's enabled and also check if we've requested it to
90 * be enabled.
91 */
92 static bool hsw_power_well_enabled(struct drm_i915_private *dev_priv,
93 struct i915_power_well *power_well)
94 {
95 return I915_READ(HSW_PWR_WELL_DRIVER) ==
96 (HSW_PWR_WELL_ENABLE_REQUEST | HSW_PWR_WELL_STATE_ENABLED);
97 }
98
99 /**
100 * __intel_display_power_is_enabled - unlocked check for a power domain
101 * @dev_priv: i915 device instance
102 * @domain: power domain to check
103 *
104 * This is the unlocked version of intel_display_power_is_enabled() and should
105 * only be used from error capture and recovery code where deadlocks are
106 * possible.
107 *
108 * Returns:
109 * True when the power domain is enabled, false otherwise.
110 */
111 bool __intel_display_power_is_enabled(struct drm_i915_private *dev_priv,
112 enum intel_display_power_domain domain)
113 {
114 struct i915_power_domains *power_domains;
115 struct i915_power_well *power_well;
116 bool is_enabled;
117 int i;
118
119 if (dev_priv->pm.suspended)
120 return false;
121
122 power_domains = &dev_priv->power_domains;
123
124 is_enabled = true;
125
126 for_each_power_well_rev(i, power_well, BIT(domain), power_domains) {
127 if (power_well->always_on)
128 continue;
129
130 if (!power_well->hw_enabled) {
131 is_enabled = false;
132 break;
133 }
134 }
135
136 return is_enabled;
137 }
138
139 /**
140 * intel_display_power_is_enabled - check for a power domain
141 * @dev_priv: i915 device instance
142 * @domain: power domain to check
143 *
144 * This function can be used to check the hw power domain state. It is mostly
145 * used in hardware state readout functions. Everywhere else code should rely
146 * upon explicit power domain reference counting to ensure that the hardware
147 * block is powered up before accessing it.
148 *
149 * Callers must hold the relevant modesetting locks to ensure that concurrent
150 * threads can't disable the power well while the caller tries to read a few
151 * registers.
152 *
153 * Returns:
154 * True when the power domain is enabled, false otherwise.
155 */
156 bool intel_display_power_is_enabled(struct drm_i915_private *dev_priv,
157 enum intel_display_power_domain domain)
158 {
159 struct i915_power_domains *power_domains;
160 bool ret;
161
162 power_domains = &dev_priv->power_domains;
163
164 mutex_lock(&power_domains->lock);
165 ret = __intel_display_power_is_enabled(dev_priv, domain);
166 mutex_unlock(&power_domains->lock);
167
168 return ret;
169 }
170
171 /**
172 * intel_display_set_init_power - set the initial power domain state
173 * @dev_priv: i915 device instance
174 * @enable: whether to enable or disable the initial power domain state
175 *
176 * For simplicity our driver load/unload and system suspend/resume code assumes
177 * that all power domains are always enabled. This functions controls the state
178 * of this little hack. While the initial power domain state is enabled runtime
179 * pm is effectively disabled.
180 */
181 void intel_display_set_init_power(struct drm_i915_private *dev_priv,
182 bool enable)
183 {
184 if (dev_priv->power_domains.init_power_on == enable)
185 return;
186
187 if (enable)
188 intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);
189 else
190 intel_display_power_put(dev_priv, POWER_DOMAIN_INIT);
191
192 dev_priv->power_domains.init_power_on = enable;
193 }
194
195 /*
196 * Starting with Haswell, we have a "Power Down Well" that can be turned off
197 * when not needed anymore. We have 4 registers that can request the power well
198 * to be enabled, and it will only be disabled if none of the registers is
199 * requesting it to be enabled.
200 */
201 static void hsw_power_well_post_enable(struct drm_i915_private *dev_priv)
202 {
203 struct drm_device *dev = dev_priv->dev;
204
205 /*
206 * After we re-enable the power well, if we touch VGA register 0x3d5
207 * we'll get unclaimed register interrupts. This stops after we write
208 * anything to the VGA MSR register. The vgacon module uses this
209 * register all the time, so if we unbind our driver and, as a
210 * consequence, bind vgacon, we'll get stuck in an infinite loop at
211 * console_unlock(). So make here we touch the VGA MSR register, making
212 * sure vgacon can keep working normally without triggering interrupts
213 * and error messages.
214 */
215 vga_get_uninterruptible(dev->pdev, VGA_RSRC_LEGACY_IO);
216 outb(inb(VGA_MSR_READ), VGA_MSR_WRITE);
217 vga_put(dev->pdev, VGA_RSRC_LEGACY_IO);
218
219 if (IS_BROADWELL(dev))
220 gen8_irq_power_well_post_enable(dev_priv,
221 1 << PIPE_C | 1 << PIPE_B);
222 }
223
224 static void skl_power_well_post_enable(struct drm_i915_private *dev_priv,
225 struct i915_power_well *power_well)
226 {
227 struct drm_device *dev = dev_priv->dev;
228
229 /*
230 * After we re-enable the power well, if we touch VGA register 0x3d5
231 * we'll get unclaimed register interrupts. This stops after we write
232 * anything to the VGA MSR register. The vgacon module uses this
233 * register all the time, so if we unbind our driver and, as a
234 * consequence, bind vgacon, we'll get stuck in an infinite loop at
235 * console_unlock(). So make here we touch the VGA MSR register, making
236 * sure vgacon can keep working normally without triggering interrupts
237 * and error messages.
238 */
239 if (power_well->data == SKL_DISP_PW_2) {
240 vga_get_uninterruptible(dev->pdev, VGA_RSRC_LEGACY_IO);
241 outb(inb(VGA_MSR_READ), VGA_MSR_WRITE);
242 vga_put(dev->pdev, VGA_RSRC_LEGACY_IO);
243
244 gen8_irq_power_well_post_enable(dev_priv,
245 1 << PIPE_C | 1 << PIPE_B);
246 }
247
248 if (power_well->data == SKL_DISP_PW_1) {
249 if (!dev_priv->power_domains.initializing)
250 intel_prepare_ddi(dev);
251 gen8_irq_power_well_post_enable(dev_priv, 1 << PIPE_A);
252 }
253 }
254
255 static void hsw_set_power_well(struct drm_i915_private *dev_priv,
256 struct i915_power_well *power_well, bool enable)
257 {
258 bool is_enabled, enable_requested;
259 uint32_t tmp;
260
261 tmp = I915_READ(HSW_PWR_WELL_DRIVER);
262 is_enabled = tmp & HSW_PWR_WELL_STATE_ENABLED;
263 enable_requested = tmp & HSW_PWR_WELL_ENABLE_REQUEST;
264
265 if (enable) {
266 if (!enable_requested)
267 I915_WRITE(HSW_PWR_WELL_DRIVER,
268 HSW_PWR_WELL_ENABLE_REQUEST);
269
270 if (!is_enabled) {
271 DRM_DEBUG_KMS("Enabling power well\n");
272 if (wait_for((I915_READ(HSW_PWR_WELL_DRIVER) &
273 HSW_PWR_WELL_STATE_ENABLED), 20))
274 DRM_ERROR("Timeout enabling power well\n");
275 hsw_power_well_post_enable(dev_priv);
276 }
277
278 } else {
279 if (enable_requested) {
280 I915_WRITE(HSW_PWR_WELL_DRIVER, 0);
281 POSTING_READ(HSW_PWR_WELL_DRIVER);
282 DRM_DEBUG_KMS("Requesting to disable the power well\n");
283 }
284 }
285 }
286
287 #define SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS ( \
288 BIT(POWER_DOMAIN_TRANSCODER_A) | \
289 BIT(POWER_DOMAIN_PIPE_B) | \
290 BIT(POWER_DOMAIN_TRANSCODER_B) | \
291 BIT(POWER_DOMAIN_PIPE_C) | \
292 BIT(POWER_DOMAIN_TRANSCODER_C) | \
293 BIT(POWER_DOMAIN_PIPE_B_PANEL_FITTER) | \
294 BIT(POWER_DOMAIN_PIPE_C_PANEL_FITTER) | \
295 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \
296 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \
297 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \
298 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \
299 BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) | \
300 BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) | \
301 BIT(POWER_DOMAIN_PORT_DDI_E_2_LANES) | \
302 BIT(POWER_DOMAIN_AUX_B) | \
303 BIT(POWER_DOMAIN_AUX_C) | \
304 BIT(POWER_DOMAIN_AUX_D) | \
305 BIT(POWER_DOMAIN_AUDIO) | \
306 BIT(POWER_DOMAIN_VGA) | \
307 BIT(POWER_DOMAIN_INIT))
308 #define SKL_DISPLAY_POWERWELL_1_POWER_DOMAINS ( \
309 SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS | \
310 BIT(POWER_DOMAIN_PLLS) | \
311 BIT(POWER_DOMAIN_PIPE_A) | \
312 BIT(POWER_DOMAIN_TRANSCODER_EDP) | \
313 BIT(POWER_DOMAIN_PIPE_A_PANEL_FITTER) | \
314 BIT(POWER_DOMAIN_PORT_DDI_A_2_LANES) | \
315 BIT(POWER_DOMAIN_PORT_DDI_A_4_LANES) | \
316 BIT(POWER_DOMAIN_AUX_A) | \
317 BIT(POWER_DOMAIN_INIT))
318 #define SKL_DISPLAY_DDI_A_E_POWER_DOMAINS ( \
319 BIT(POWER_DOMAIN_PORT_DDI_A_2_LANES) | \
320 BIT(POWER_DOMAIN_PORT_DDI_A_4_LANES) | \
321 BIT(POWER_DOMAIN_PORT_DDI_E_2_LANES) | \
322 BIT(POWER_DOMAIN_INIT))
323 #define SKL_DISPLAY_DDI_B_POWER_DOMAINS ( \
324 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \
325 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \
326 BIT(POWER_DOMAIN_INIT))
327 #define SKL_DISPLAY_DDI_C_POWER_DOMAINS ( \
328 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \
329 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \
330 BIT(POWER_DOMAIN_INIT))
331 #define SKL_DISPLAY_DDI_D_POWER_DOMAINS ( \
332 BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) | \
333 BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) | \
334 BIT(POWER_DOMAIN_INIT))
335 #define SKL_DISPLAY_MISC_IO_POWER_DOMAINS ( \
336 SKL_DISPLAY_POWERWELL_1_POWER_DOMAINS | \
337 BIT(POWER_DOMAIN_PLLS) | \
338 BIT(POWER_DOMAIN_INIT))
339 #define SKL_DISPLAY_ALWAYS_ON_POWER_DOMAINS ( \
340 (POWER_DOMAIN_MASK & ~(SKL_DISPLAY_POWERWELL_1_POWER_DOMAINS | \
341 SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS | \
342 SKL_DISPLAY_DDI_A_E_POWER_DOMAINS | \
343 SKL_DISPLAY_DDI_B_POWER_DOMAINS | \
344 SKL_DISPLAY_DDI_C_POWER_DOMAINS | \
345 SKL_DISPLAY_DDI_D_POWER_DOMAINS | \
346 SKL_DISPLAY_MISC_IO_POWER_DOMAINS)) | \
347 BIT(POWER_DOMAIN_INIT))
348
349 #define BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS ( \
350 BIT(POWER_DOMAIN_TRANSCODER_A) | \
351 BIT(POWER_DOMAIN_PIPE_B) | \
352 BIT(POWER_DOMAIN_TRANSCODER_B) | \
353 BIT(POWER_DOMAIN_PIPE_C) | \
354 BIT(POWER_DOMAIN_TRANSCODER_C) | \
355 BIT(POWER_DOMAIN_PIPE_B_PANEL_FITTER) | \
356 BIT(POWER_DOMAIN_PIPE_C_PANEL_FITTER) | \
357 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \
358 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \
359 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \
360 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \
361 BIT(POWER_DOMAIN_AUX_B) | \
362 BIT(POWER_DOMAIN_AUX_C) | \
363 BIT(POWER_DOMAIN_AUDIO) | \
364 BIT(POWER_DOMAIN_VGA) | \
365 BIT(POWER_DOMAIN_GMBUS) | \
366 BIT(POWER_DOMAIN_INIT))
367 #define BXT_DISPLAY_POWERWELL_1_POWER_DOMAINS ( \
368 BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS | \
369 BIT(POWER_DOMAIN_PIPE_A) | \
370 BIT(POWER_DOMAIN_TRANSCODER_EDP) | \
371 BIT(POWER_DOMAIN_PIPE_A_PANEL_FITTER) | \
372 BIT(POWER_DOMAIN_PORT_DDI_A_2_LANES) | \
373 BIT(POWER_DOMAIN_PORT_DDI_A_4_LANES) | \
374 BIT(POWER_DOMAIN_AUX_A) | \
375 BIT(POWER_DOMAIN_PLLS) | \
376 BIT(POWER_DOMAIN_INIT))
377 #define BXT_DISPLAY_ALWAYS_ON_POWER_DOMAINS ( \
378 (POWER_DOMAIN_MASK & ~(BXT_DISPLAY_POWERWELL_1_POWER_DOMAINS | \
379 BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS)) | \
380 BIT(POWER_DOMAIN_INIT))
381
382 static void assert_can_enable_dc9(struct drm_i915_private *dev_priv)
383 {
384 struct drm_device *dev = dev_priv->dev;
385
386 WARN(!IS_BROXTON(dev), "Platform doesn't support DC9.\n");
387 WARN((I915_READ(DC_STATE_EN) & DC_STATE_EN_DC9),
388 "DC9 already programmed to be enabled.\n");
389 WARN(I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5,
390 "DC5 still not disabled to enable DC9.\n");
391 WARN(I915_READ(HSW_PWR_WELL_DRIVER), "Power well on.\n");
392 WARN(intel_irqs_enabled(dev_priv), "Interrupts not disabled yet.\n");
393
394 /*
395 * TODO: check for the following to verify the conditions to enter DC9
396 * state are satisfied:
397 * 1] Check relevant display engine registers to verify if mode set
398 * disable sequence was followed.
399 * 2] Check if display uninitialize sequence is initialized.
400 */
401 }
402
403 static void assert_can_disable_dc9(struct drm_i915_private *dev_priv)
404 {
405 WARN(intel_irqs_enabled(dev_priv), "Interrupts not disabled yet.\n");
406 WARN(!(I915_READ(DC_STATE_EN) & DC_STATE_EN_DC9),
407 "DC9 already programmed to be disabled.\n");
408 WARN(I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5,
409 "DC5 still not disabled.\n");
410
411 /*
412 * TODO: check for the following to verify DC9 state was indeed
413 * entered before programming to disable it:
414 * 1] Check relevant display engine registers to verify if mode
415 * set disable sequence was followed.
416 * 2] Check if display uninitialize sequence is initialized.
417 */
418 }
419
420 void bxt_enable_dc9(struct drm_i915_private *dev_priv)
421 {
422 uint32_t val;
423
424 assert_can_enable_dc9(dev_priv);
425
426 DRM_DEBUG_KMS("Enabling DC9\n");
427
428 val = I915_READ(DC_STATE_EN);
429 val |= DC_STATE_EN_DC9;
430 I915_WRITE(DC_STATE_EN, val);
431 POSTING_READ(DC_STATE_EN);
432 }
433
434 void bxt_disable_dc9(struct drm_i915_private *dev_priv)
435 {
436 uint32_t val;
437
438 assert_can_disable_dc9(dev_priv);
439
440 DRM_DEBUG_KMS("Disabling DC9\n");
441
442 val = I915_READ(DC_STATE_EN);
443 val &= ~DC_STATE_EN_DC9;
444 I915_WRITE(DC_STATE_EN, val);
445 POSTING_READ(DC_STATE_EN);
446 }
447
448 static void gen9_set_dc_state_debugmask_memory_up(
449 struct drm_i915_private *dev_priv)
450 {
451 uint32_t val;
452
453 /* The below bit doesn't need to be cleared ever afterwards */
454 val = I915_READ(DC_STATE_DEBUG);
455 if (!(val & DC_STATE_DEBUG_MASK_MEMORY_UP)) {
456 val |= DC_STATE_DEBUG_MASK_MEMORY_UP;
457 I915_WRITE(DC_STATE_DEBUG, val);
458 POSTING_READ(DC_STATE_DEBUG);
459 }
460 }
461
462 static void assert_can_enable_dc5(struct drm_i915_private *dev_priv)
463 {
464 struct drm_device *dev = dev_priv->dev;
465 bool pg2_enabled = intel_display_power_well_is_enabled(dev_priv,
466 SKL_DISP_PW_2);
467
468 WARN_ONCE(!IS_SKYLAKE(dev), "Platform doesn't support DC5.\n");
469 WARN_ONCE(!HAS_RUNTIME_PM(dev), "Runtime PM not enabled.\n");
470 WARN_ONCE(pg2_enabled, "PG2 not disabled to enable DC5.\n");
471
472 WARN_ONCE((I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5),
473 "DC5 already programmed to be enabled.\n");
474 WARN_ONCE(dev_priv->pm.suspended,
475 "DC5 cannot be enabled, if platform is runtime-suspended.\n");
476
477 assert_csr_loaded(dev_priv);
478 }
479
480 static void assert_can_disable_dc5(struct drm_i915_private *dev_priv)
481 {
482 bool pg2_enabled = intel_display_power_well_is_enabled(dev_priv,
483 SKL_DISP_PW_2);
484 /*
485 * During initialization, the firmware may not be loaded yet.
486 * We still want to make sure that the DC enabling flag is cleared.
487 */
488 if (dev_priv->power_domains.initializing)
489 return;
490
491 WARN_ONCE(!pg2_enabled, "PG2 not enabled to disable DC5.\n");
492 WARN_ONCE(dev_priv->pm.suspended,
493 "Disabling of DC5 while platform is runtime-suspended should never happen.\n");
494 }
495
496 static void gen9_enable_dc5(struct drm_i915_private *dev_priv)
497 {
498 uint32_t val;
499
500 assert_can_enable_dc5(dev_priv);
501
502 DRM_DEBUG_KMS("Enabling DC5\n");
503
504 gen9_set_dc_state_debugmask_memory_up(dev_priv);
505
506 val = I915_READ(DC_STATE_EN);
507 val &= ~DC_STATE_EN_UPTO_DC5_DC6_MASK;
508 val |= DC_STATE_EN_UPTO_DC5;
509 I915_WRITE(DC_STATE_EN, val);
510 POSTING_READ(DC_STATE_EN);
511 }
512
513 static void gen9_disable_dc5(struct drm_i915_private *dev_priv)
514 {
515 uint32_t val;
516
517 assert_can_disable_dc5(dev_priv);
518
519 DRM_DEBUG_KMS("Disabling DC5\n");
520
521 val = I915_READ(DC_STATE_EN);
522 val &= ~DC_STATE_EN_UPTO_DC5;
523 I915_WRITE(DC_STATE_EN, val);
524 POSTING_READ(DC_STATE_EN);
525 }
526
527 static void assert_can_enable_dc6(struct drm_i915_private *dev_priv)
528 {
529 struct drm_device *dev = dev_priv->dev;
530
531 WARN_ONCE(!IS_SKYLAKE(dev), "Platform doesn't support DC6.\n");
532 WARN_ONCE(!HAS_RUNTIME_PM(dev), "Runtime PM not enabled.\n");
533 WARN_ONCE(I915_READ(UTIL_PIN_CTL) & UTIL_PIN_ENABLE,
534 "Backlight is not disabled.\n");
535 WARN_ONCE((I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC6),
536 "DC6 already programmed to be enabled.\n");
537
538 assert_csr_loaded(dev_priv);
539 }
540
541 static void assert_can_disable_dc6(struct drm_i915_private *dev_priv)
542 {
543 /*
544 * During initialization, the firmware may not be loaded yet.
545 * We still want to make sure that the DC enabling flag is cleared.
546 */
547 if (dev_priv->power_domains.initializing)
548 return;
549
550 assert_csr_loaded(dev_priv);
551 WARN_ONCE(!(I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC6),
552 "DC6 already programmed to be disabled.\n");
553 }
554
555 static void skl_enable_dc6(struct drm_i915_private *dev_priv)
556 {
557 uint32_t val;
558
559 assert_can_enable_dc6(dev_priv);
560
561 DRM_DEBUG_KMS("Enabling DC6\n");
562
563 gen9_set_dc_state_debugmask_memory_up(dev_priv);
564
565 val = I915_READ(DC_STATE_EN);
566 val &= ~DC_STATE_EN_UPTO_DC5_DC6_MASK;
567 val |= DC_STATE_EN_UPTO_DC6;
568 I915_WRITE(DC_STATE_EN, val);
569 POSTING_READ(DC_STATE_EN);
570 }
571
572 static void skl_disable_dc6(struct drm_i915_private *dev_priv)
573 {
574 uint32_t val;
575
576 assert_can_disable_dc6(dev_priv);
577
578 DRM_DEBUG_KMS("Disabling DC6\n");
579
580 val = I915_READ(DC_STATE_EN);
581 val &= ~DC_STATE_EN_UPTO_DC6;
582 I915_WRITE(DC_STATE_EN, val);
583 POSTING_READ(DC_STATE_EN);
584 }
585
586 static void skl_set_power_well(struct drm_i915_private *dev_priv,
587 struct i915_power_well *power_well, bool enable)
588 {
589 struct drm_device *dev = dev_priv->dev;
590 uint32_t tmp, fuse_status;
591 uint32_t req_mask, state_mask;
592 bool is_enabled, enable_requested, check_fuse_status = false;
593
594 tmp = I915_READ(HSW_PWR_WELL_DRIVER);
595 fuse_status = I915_READ(SKL_FUSE_STATUS);
596
597 switch (power_well->data) {
598 case SKL_DISP_PW_1:
599 if (wait_for((I915_READ(SKL_FUSE_STATUS) &
600 SKL_FUSE_PG0_DIST_STATUS), 1)) {
601 DRM_ERROR("PG0 not enabled\n");
602 return;
603 }
604 break;
605 case SKL_DISP_PW_2:
606 if (!(fuse_status & SKL_FUSE_PG1_DIST_STATUS)) {
607 DRM_ERROR("PG1 in disabled state\n");
608 return;
609 }
610 break;
611 case SKL_DISP_PW_DDI_A_E:
612 case SKL_DISP_PW_DDI_B:
613 case SKL_DISP_PW_DDI_C:
614 case SKL_DISP_PW_DDI_D:
615 case SKL_DISP_PW_MISC_IO:
616 break;
617 default:
618 WARN(1, "Unknown power well %lu\n", power_well->data);
619 return;
620 }
621
622 req_mask = SKL_POWER_WELL_REQ(power_well->data);
623 enable_requested = tmp & req_mask;
624 state_mask = SKL_POWER_WELL_STATE(power_well->data);
625 is_enabled = tmp & state_mask;
626
627 if (enable) {
628 if (!enable_requested) {
629 WARN((tmp & state_mask) &&
630 !I915_READ(HSW_PWR_WELL_BIOS),
631 "Invalid for power well status to be enabled, unless done by the BIOS, \
632 when request is to disable!\n");
633 if ((GEN9_ENABLE_DC5(dev) || SKL_ENABLE_DC6(dev)) &&
634 power_well->data == SKL_DISP_PW_2) {
635 if (SKL_ENABLE_DC6(dev)) {
636 skl_disable_dc6(dev_priv);
637 /*
638 * DDI buffer programming unnecessary during driver-load/resume
639 * as it's already done during modeset initialization then.
640 * It's also invalid here as encoder list is still uninitialized.
641 */
642 if (!dev_priv->power_domains.initializing)
643 intel_prepare_ddi(dev);
644 } else {
645 gen9_disable_dc5(dev_priv);
646 }
647 }
648 I915_WRITE(HSW_PWR_WELL_DRIVER, tmp | req_mask);
649 }
650
651 if (!is_enabled) {
652 DRM_DEBUG_KMS("Enabling %s\n", power_well->name);
653 if (wait_for((I915_READ(HSW_PWR_WELL_DRIVER) &
654 state_mask), 1))
655 DRM_ERROR("%s enable timeout\n",
656 power_well->name);
657 check_fuse_status = true;
658 }
659 } else {
660 if (enable_requested) {
661 if (IS_SKYLAKE(dev) &&
662 (power_well->data == SKL_DISP_PW_1) &&
663 (intel_csr_load_status_get(dev_priv) == FW_LOADED))
664 DRM_DEBUG_KMS("Not Disabling PW1, dmc will handle\n");
665 else {
666 I915_WRITE(HSW_PWR_WELL_DRIVER, tmp & ~req_mask);
667 POSTING_READ(HSW_PWR_WELL_DRIVER);
668 DRM_DEBUG_KMS("Disabling %s\n", power_well->name);
669 }
670
671 if ((GEN9_ENABLE_DC5(dev) || SKL_ENABLE_DC6(dev)) &&
672 power_well->data == SKL_DISP_PW_2) {
673 enum csr_state state;
674 /* TODO: wait for a completion event or
675 * similar here instead of busy
676 * waiting using wait_for function.
677 */
678 wait_for((state = intel_csr_load_status_get(dev_priv)) !=
679 FW_UNINITIALIZED, 1000);
680 if (state != FW_LOADED)
681 DRM_DEBUG("CSR firmware not ready (%d)\n",
682 state);
683 else
684 if (SKL_ENABLE_DC6(dev))
685 skl_enable_dc6(dev_priv);
686 else
687 gen9_enable_dc5(dev_priv);
688 }
689 }
690 }
691
692 if (check_fuse_status) {
693 if (power_well->data == SKL_DISP_PW_1) {
694 if (wait_for((I915_READ(SKL_FUSE_STATUS) &
695 SKL_FUSE_PG1_DIST_STATUS), 1))
696 DRM_ERROR("PG1 distributing status timeout\n");
697 } else if (power_well->data == SKL_DISP_PW_2) {
698 if (wait_for((I915_READ(SKL_FUSE_STATUS) &
699 SKL_FUSE_PG2_DIST_STATUS), 1))
700 DRM_ERROR("PG2 distributing status timeout\n");
701 }
702 }
703
704 if (enable && !is_enabled)
705 skl_power_well_post_enable(dev_priv, power_well);
706 }
707
708 static void hsw_power_well_sync_hw(struct drm_i915_private *dev_priv,
709 struct i915_power_well *power_well)
710 {
711 hsw_set_power_well(dev_priv, power_well, power_well->count > 0);
712
713 /*
714 * We're taking over the BIOS, so clear any requests made by it since
715 * the driver is in charge now.
716 */
717 if (I915_READ(HSW_PWR_WELL_BIOS) & HSW_PWR_WELL_ENABLE_REQUEST)
718 I915_WRITE(HSW_PWR_WELL_BIOS, 0);
719 }
720
721 static void hsw_power_well_enable(struct drm_i915_private *dev_priv,
722 struct i915_power_well *power_well)
723 {
724 hsw_set_power_well(dev_priv, power_well, true);
725 }
726
727 static void hsw_power_well_disable(struct drm_i915_private *dev_priv,
728 struct i915_power_well *power_well)
729 {
730 hsw_set_power_well(dev_priv, power_well, false);
731 }
732
733 static bool skl_power_well_enabled(struct drm_i915_private *dev_priv,
734 struct i915_power_well *power_well)
735 {
736 uint32_t mask = SKL_POWER_WELL_REQ(power_well->data) |
737 SKL_POWER_WELL_STATE(power_well->data);
738
739 return (I915_READ(HSW_PWR_WELL_DRIVER) & mask) == mask;
740 }
741
742 static void skl_power_well_sync_hw(struct drm_i915_private *dev_priv,
743 struct i915_power_well *power_well)
744 {
745 skl_set_power_well(dev_priv, power_well, power_well->count > 0);
746
747 /* Clear any request made by BIOS as driver is taking over */
748 I915_WRITE(HSW_PWR_WELL_BIOS, 0);
749 }
750
751 static void skl_power_well_enable(struct drm_i915_private *dev_priv,
752 struct i915_power_well *power_well)
753 {
754 skl_set_power_well(dev_priv, power_well, true);
755 }
756
757 static void skl_power_well_disable(struct drm_i915_private *dev_priv,
758 struct i915_power_well *power_well)
759 {
760 skl_set_power_well(dev_priv, power_well, false);
761 }
762
763 static void i9xx_always_on_power_well_noop(struct drm_i915_private *dev_priv,
764 struct i915_power_well *power_well)
765 {
766 }
767
768 static bool i9xx_always_on_power_well_enabled(struct drm_i915_private *dev_priv,
769 struct i915_power_well *power_well)
770 {
771 return true;
772 }
773
774 static void vlv_set_power_well(struct drm_i915_private *dev_priv,
775 struct i915_power_well *power_well, bool enable)
776 {
777 enum punit_power_well power_well_id = power_well->data;
778 u32 mask;
779 u32 state;
780 u32 ctrl;
781
782 mask = PUNIT_PWRGT_MASK(power_well_id);
783 state = enable ? PUNIT_PWRGT_PWR_ON(power_well_id) :
784 PUNIT_PWRGT_PWR_GATE(power_well_id);
785
786 mutex_lock(&dev_priv->rps.hw_lock);
787
788 #define COND \
789 ((vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_STATUS) & mask) == state)
790
791 if (COND)
792 goto out;
793
794 ctrl = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_CTRL);
795 ctrl &= ~mask;
796 ctrl |= state;
797 vlv_punit_write(dev_priv, PUNIT_REG_PWRGT_CTRL, ctrl);
798
799 if (wait_for(COND, 100))
800 DRM_ERROR("timeout setting power well state %08x (%08x)\n",
801 state,
802 vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_CTRL));
803
804 #undef COND
805
806 out:
807 mutex_unlock(&dev_priv->rps.hw_lock);
808 }
809
810 static void vlv_power_well_sync_hw(struct drm_i915_private *dev_priv,
811 struct i915_power_well *power_well)
812 {
813 vlv_set_power_well(dev_priv, power_well, power_well->count > 0);
814 }
815
816 static void vlv_power_well_enable(struct drm_i915_private *dev_priv,
817 struct i915_power_well *power_well)
818 {
819 vlv_set_power_well(dev_priv, power_well, true);
820 }
821
822 static void vlv_power_well_disable(struct drm_i915_private *dev_priv,
823 struct i915_power_well *power_well)
824 {
825 vlv_set_power_well(dev_priv, power_well, false);
826 }
827
828 static bool vlv_power_well_enabled(struct drm_i915_private *dev_priv,
829 struct i915_power_well *power_well)
830 {
831 int power_well_id = power_well->data;
832 bool enabled = false;
833 u32 mask;
834 u32 state;
835 u32 ctrl;
836
837 mask = PUNIT_PWRGT_MASK(power_well_id);
838 ctrl = PUNIT_PWRGT_PWR_ON(power_well_id);
839
840 mutex_lock(&dev_priv->rps.hw_lock);
841
842 state = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_STATUS) & mask;
843 /*
844 * We only ever set the power-on and power-gate states, anything
845 * else is unexpected.
846 */
847 WARN_ON(state != PUNIT_PWRGT_PWR_ON(power_well_id) &&
848 state != PUNIT_PWRGT_PWR_GATE(power_well_id));
849 if (state == ctrl)
850 enabled = true;
851
852 /*
853 * A transient state at this point would mean some unexpected party
854 * is poking at the power controls too.
855 */
856 ctrl = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_CTRL) & mask;
857 WARN_ON(ctrl != state);
858
859 mutex_unlock(&dev_priv->rps.hw_lock);
860
861 return enabled;
862 }
863
864 static void vlv_display_power_well_init(struct drm_i915_private *dev_priv)
865 {
866 enum pipe pipe;
867
868 /*
869 * Enable the CRI clock source so we can get at the
870 * display and the reference clock for VGA
871 * hotplug / manual detection. Supposedly DSI also
872 * needs the ref clock up and running.
873 *
874 * CHV DPLL B/C have some issues if VGA mode is enabled.
875 */
876 for_each_pipe(dev_priv->dev, pipe) {
877 u32 val = I915_READ(DPLL(pipe));
878
879 val |= DPLL_REF_CLK_ENABLE_VLV | DPLL_VGA_MODE_DIS;
880 if (pipe != PIPE_A)
881 val |= DPLL_INTEGRATED_CRI_CLK_VLV;
882
883 I915_WRITE(DPLL(pipe), val);
884 }
885
886 spin_lock_irq(&dev_priv->irq_lock);
887 valleyview_enable_display_irqs(dev_priv);
888 spin_unlock_irq(&dev_priv->irq_lock);
889
890 /*
891 * During driver initialization/resume we can avoid restoring the
892 * part of the HW/SW state that will be inited anyway explicitly.
893 */
894 if (dev_priv->power_domains.initializing)
895 return;
896
897 intel_hpd_init(dev_priv);
898
899 i915_redisable_vga_power_on(dev_priv->dev);
900 }
901
902 static void vlv_display_power_well_deinit(struct drm_i915_private *dev_priv)
903 {
904 spin_lock_irq(&dev_priv->irq_lock);
905 valleyview_disable_display_irqs(dev_priv);
906 spin_unlock_irq(&dev_priv->irq_lock);
907
908 vlv_power_sequencer_reset(dev_priv);
909 }
910
911 static void vlv_display_power_well_enable(struct drm_i915_private *dev_priv,
912 struct i915_power_well *power_well)
913 {
914 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DISP2D);
915
916 vlv_set_power_well(dev_priv, power_well, true);
917
918 vlv_display_power_well_init(dev_priv);
919 }
920
921 static void vlv_display_power_well_disable(struct drm_i915_private *dev_priv,
922 struct i915_power_well *power_well)
923 {
924 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DISP2D);
925
926 vlv_display_power_well_deinit(dev_priv);
927
928 vlv_set_power_well(dev_priv, power_well, false);
929 }
930
931 static void vlv_dpio_cmn_power_well_enable(struct drm_i915_private *dev_priv,
932 struct i915_power_well *power_well)
933 {
934 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC);
935
936 /* since ref/cri clock was enabled */
937 udelay(1); /* >10ns for cmnreset, >0ns for sidereset */
938
939 vlv_set_power_well(dev_priv, power_well, true);
940
941 /*
942 * From VLV2A0_DP_eDP_DPIO_driver_vbios_notes_10.docx -
943 * 6. De-assert cmn_reset/side_reset. Same as VLV X0.
944 * a. GUnit 0x2110 bit[0] set to 1 (def 0)
945 * b. The other bits such as sfr settings / modesel may all
946 * be set to 0.
947 *
948 * This should only be done on init and resume from S3 with
949 * both PLLs disabled, or we risk losing DPIO and PLL
950 * synchronization.
951 */
952 I915_WRITE(DPIO_CTL, I915_READ(DPIO_CTL) | DPIO_CMNRST);
953 }
954
955 static void vlv_dpio_cmn_power_well_disable(struct drm_i915_private *dev_priv,
956 struct i915_power_well *power_well)
957 {
958 enum pipe pipe;
959
960 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC);
961
962 for_each_pipe(dev_priv, pipe)
963 assert_pll_disabled(dev_priv, pipe);
964
965 /* Assert common reset */
966 I915_WRITE(DPIO_CTL, I915_READ(DPIO_CTL) & ~DPIO_CMNRST);
967
968 vlv_set_power_well(dev_priv, power_well, false);
969 }
970
971 #define POWER_DOMAIN_MASK (BIT(POWER_DOMAIN_NUM) - 1)
972
973 static struct i915_power_well *lookup_power_well(struct drm_i915_private *dev_priv,
974 int power_well_id)
975 {
976 struct i915_power_domains *power_domains = &dev_priv->power_domains;
977 struct i915_power_well *power_well;
978 int i;
979
980 for_each_power_well(i, power_well, POWER_DOMAIN_MASK, power_domains) {
981 if (power_well->data == power_well_id)
982 return power_well;
983 }
984
985 return NULL;
986 }
987
988 #define BITS_SET(val, bits) (((val) & (bits)) == (bits))
989
990 static void assert_chv_phy_status(struct drm_i915_private *dev_priv)
991 {
992 struct i915_power_well *cmn_bc =
993 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_BC);
994 struct i915_power_well *cmn_d =
995 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_D);
996 u32 phy_control = dev_priv->chv_phy_control;
997 u32 phy_status = 0;
998 u32 phy_status_mask = 0xffffffff;
999 u32 tmp;
1000
1001 /*
1002 * The BIOS can leave the PHY is some weird state
1003 * where it doesn't fully power down some parts.
1004 * Disable the asserts until the PHY has been fully
1005 * reset (ie. the power well has been disabled at
1006 * least once).
1007 */
1008 if (!dev_priv->chv_phy_assert[DPIO_PHY0])
1009 phy_status_mask &= ~(PHY_STATUS_CMN_LDO(DPIO_PHY0, DPIO_CH0) |
1010 PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH0, 0) |
1011 PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH0, 1) |
1012 PHY_STATUS_CMN_LDO(DPIO_PHY0, DPIO_CH1) |
1013 PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH1, 0) |
1014 PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH1, 1));
1015
1016 if (!dev_priv->chv_phy_assert[DPIO_PHY1])
1017 phy_status_mask &= ~(PHY_STATUS_CMN_LDO(DPIO_PHY1, DPIO_CH0) |
1018 PHY_STATUS_SPLINE_LDO(DPIO_PHY1, DPIO_CH0, 0) |
1019 PHY_STATUS_SPLINE_LDO(DPIO_PHY1, DPIO_CH0, 1));
1020
1021 if (cmn_bc->ops->is_enabled(dev_priv, cmn_bc)) {
1022 phy_status |= PHY_POWERGOOD(DPIO_PHY0);
1023
1024 /* this assumes override is only used to enable lanes */
1025 if ((phy_control & PHY_CH_POWER_DOWN_OVRD_EN(DPIO_PHY0, DPIO_CH0)) == 0)
1026 phy_control |= PHY_CH_POWER_DOWN_OVRD(0xf, DPIO_PHY0, DPIO_CH0);
1027
1028 if ((phy_control & PHY_CH_POWER_DOWN_OVRD_EN(DPIO_PHY0, DPIO_CH1)) == 0)
1029 phy_control |= PHY_CH_POWER_DOWN_OVRD(0xf, DPIO_PHY0, DPIO_CH1);
1030
1031 /* CL1 is on whenever anything is on in either channel */
1032 if (BITS_SET(phy_control,
1033 PHY_CH_POWER_DOWN_OVRD(0xf, DPIO_PHY0, DPIO_CH0) |
1034 PHY_CH_POWER_DOWN_OVRD(0xf, DPIO_PHY0, DPIO_CH1)))
1035 phy_status |= PHY_STATUS_CMN_LDO(DPIO_PHY0, DPIO_CH0);
1036
1037 /*
1038 * The DPLLB check accounts for the pipe B + port A usage
1039 * with CL2 powered up but all the lanes in the second channel
1040 * powered down.
1041 */
1042 if (BITS_SET(phy_control,
1043 PHY_CH_POWER_DOWN_OVRD(0xf, DPIO_PHY0, DPIO_CH1)) &&
1044 (I915_READ(DPLL(PIPE_B)) & DPLL_VCO_ENABLE) == 0)
1045 phy_status |= PHY_STATUS_CMN_LDO(DPIO_PHY0, DPIO_CH1);
1046
1047 if (BITS_SET(phy_control,
1048 PHY_CH_POWER_DOWN_OVRD(0x3, DPIO_PHY0, DPIO_CH0)))
1049 phy_status |= PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH0, 0);
1050 if (BITS_SET(phy_control,
1051 PHY_CH_POWER_DOWN_OVRD(0xc, DPIO_PHY0, DPIO_CH0)))
1052 phy_status |= PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH0, 1);
1053
1054 if (BITS_SET(phy_control,
1055 PHY_CH_POWER_DOWN_OVRD(0x3, DPIO_PHY0, DPIO_CH1)))
1056 phy_status |= PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH1, 0);
1057 if (BITS_SET(phy_control,
1058 PHY_CH_POWER_DOWN_OVRD(0xc, DPIO_PHY0, DPIO_CH1)))
1059 phy_status |= PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH1, 1);
1060 }
1061
1062 if (cmn_d->ops->is_enabled(dev_priv, cmn_d)) {
1063 phy_status |= PHY_POWERGOOD(DPIO_PHY1);
1064
1065 /* this assumes override is only used to enable lanes */
1066 if ((phy_control & PHY_CH_POWER_DOWN_OVRD_EN(DPIO_PHY1, DPIO_CH0)) == 0)
1067 phy_control |= PHY_CH_POWER_DOWN_OVRD(0xf, DPIO_PHY1, DPIO_CH0);
1068
1069 if (BITS_SET(phy_control,
1070 PHY_CH_POWER_DOWN_OVRD(0xf, DPIO_PHY1, DPIO_CH0)))
1071 phy_status |= PHY_STATUS_CMN_LDO(DPIO_PHY1, DPIO_CH0);
1072
1073 if (BITS_SET(phy_control,
1074 PHY_CH_POWER_DOWN_OVRD(0x3, DPIO_PHY1, DPIO_CH0)))
1075 phy_status |= PHY_STATUS_SPLINE_LDO(DPIO_PHY1, DPIO_CH0, 0);
1076 if (BITS_SET(phy_control,
1077 PHY_CH_POWER_DOWN_OVRD(0xc, DPIO_PHY1, DPIO_CH0)))
1078 phy_status |= PHY_STATUS_SPLINE_LDO(DPIO_PHY1, DPIO_CH0, 1);
1079 }
1080
1081 phy_status &= phy_status_mask;
1082
1083 /*
1084 * The PHY may be busy with some initial calibration and whatnot,
1085 * so the power state can take a while to actually change.
1086 */
1087 if (wait_for((tmp = I915_READ(DISPLAY_PHY_STATUS) & phy_status_mask) == phy_status, 10))
1088 WARN(phy_status != tmp,
1089 "Unexpected PHY_STATUS 0x%08x, expected 0x%08x (PHY_CONTROL=0x%08x)\n",
1090 tmp, phy_status, dev_priv->chv_phy_control);
1091 }
1092
1093 #undef BITS_SET
1094
1095 static void chv_dpio_cmn_power_well_enable(struct drm_i915_private *dev_priv,
1096 struct i915_power_well *power_well)
1097 {
1098 enum dpio_phy phy;
1099 enum pipe pipe;
1100 uint32_t tmp;
1101
1102 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC &&
1103 power_well->data != PUNIT_POWER_WELL_DPIO_CMN_D);
1104
1105 if (power_well->data == PUNIT_POWER_WELL_DPIO_CMN_BC) {
1106 pipe = PIPE_A;
1107 phy = DPIO_PHY0;
1108 } else {
1109 pipe = PIPE_C;
1110 phy = DPIO_PHY1;
1111 }
1112
1113 /* since ref/cri clock was enabled */
1114 udelay(1); /* >10ns for cmnreset, >0ns for sidereset */
1115 vlv_set_power_well(dev_priv, power_well, true);
1116
1117 /* Poll for phypwrgood signal */
1118 if (wait_for(I915_READ(DISPLAY_PHY_STATUS) & PHY_POWERGOOD(phy), 1))
1119 DRM_ERROR("Display PHY %d is not power up\n", phy);
1120
1121 mutex_lock(&dev_priv->sb_lock);
1122
1123 /* Enable dynamic power down */
1124 tmp = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW28);
1125 tmp |= DPIO_DYNPWRDOWNEN_CH0 | DPIO_CL1POWERDOWNEN |
1126 DPIO_SUS_CLK_CONFIG_GATE_CLKREQ;
1127 vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW28, tmp);
1128
1129 if (power_well->data == PUNIT_POWER_WELL_DPIO_CMN_BC) {
1130 tmp = vlv_dpio_read(dev_priv, pipe, _CHV_CMN_DW6_CH1);
1131 tmp |= DPIO_DYNPWRDOWNEN_CH1;
1132 vlv_dpio_write(dev_priv, pipe, _CHV_CMN_DW6_CH1, tmp);
1133 } else {
1134 /*
1135 * Force the non-existing CL2 off. BXT does this
1136 * too, so maybe it saves some power even though
1137 * CL2 doesn't exist?
1138 */
1139 tmp = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW30);
1140 tmp |= DPIO_CL2_LDOFUSE_PWRENB;
1141 vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW30, tmp);
1142 }
1143
1144 mutex_unlock(&dev_priv->sb_lock);
1145
1146 dev_priv->chv_phy_control |= PHY_COM_LANE_RESET_DEASSERT(phy);
1147 I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control);
1148
1149 DRM_DEBUG_KMS("Enabled DPIO PHY%d (PHY_CONTROL=0x%08x)\n",
1150 phy, dev_priv->chv_phy_control);
1151
1152 assert_chv_phy_status(dev_priv);
1153 }
1154
1155 static void chv_dpio_cmn_power_well_disable(struct drm_i915_private *dev_priv,
1156 struct i915_power_well *power_well)
1157 {
1158 enum dpio_phy phy;
1159
1160 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC &&
1161 power_well->data != PUNIT_POWER_WELL_DPIO_CMN_D);
1162
1163 if (power_well->data == PUNIT_POWER_WELL_DPIO_CMN_BC) {
1164 phy = DPIO_PHY0;
1165 assert_pll_disabled(dev_priv, PIPE_A);
1166 assert_pll_disabled(dev_priv, PIPE_B);
1167 } else {
1168 phy = DPIO_PHY1;
1169 assert_pll_disabled(dev_priv, PIPE_C);
1170 }
1171
1172 dev_priv->chv_phy_control &= ~PHY_COM_LANE_RESET_DEASSERT(phy);
1173 I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control);
1174
1175 vlv_set_power_well(dev_priv, power_well, false);
1176
1177 DRM_DEBUG_KMS("Disabled DPIO PHY%d (PHY_CONTROL=0x%08x)\n",
1178 phy, dev_priv->chv_phy_control);
1179
1180 /* PHY is fully reset now, so we can enable the PHY state asserts */
1181 dev_priv->chv_phy_assert[phy] = true;
1182
1183 assert_chv_phy_status(dev_priv);
1184 }
1185
1186 static void assert_chv_phy_powergate(struct drm_i915_private *dev_priv, enum dpio_phy phy,
1187 enum dpio_channel ch, bool override, unsigned int mask)
1188 {
1189 enum pipe pipe = phy == DPIO_PHY0 ? PIPE_A : PIPE_C;
1190 u32 reg, val, expected, actual;
1191
1192 /*
1193 * The BIOS can leave the PHY is some weird state
1194 * where it doesn't fully power down some parts.
1195 * Disable the asserts until the PHY has been fully
1196 * reset (ie. the power well has been disabled at
1197 * least once).
1198 */
1199 if (!dev_priv->chv_phy_assert[phy])
1200 return;
1201
1202 if (ch == DPIO_CH0)
1203 reg = _CHV_CMN_DW0_CH0;
1204 else
1205 reg = _CHV_CMN_DW6_CH1;
1206
1207 mutex_lock(&dev_priv->sb_lock);
1208 val = vlv_dpio_read(dev_priv, pipe, reg);
1209 mutex_unlock(&dev_priv->sb_lock);
1210
1211 /*
1212 * This assumes !override is only used when the port is disabled.
1213 * All lanes should power down even without the override when
1214 * the port is disabled.
1215 */
1216 if (!override || mask == 0xf) {
1217 expected = DPIO_ALLDL_POWERDOWN | DPIO_ANYDL_POWERDOWN;
1218 /*
1219 * If CH1 common lane is not active anymore
1220 * (eg. for pipe B DPLL) the entire channel will
1221 * shut down, which causes the common lane registers
1222 * to read as 0. That means we can't actually check
1223 * the lane power down status bits, but as the entire
1224 * register reads as 0 it's a good indication that the
1225 * channel is indeed entirely powered down.
1226 */
1227 if (ch == DPIO_CH1 && val == 0)
1228 expected = 0;
1229 } else if (mask != 0x0) {
1230 expected = DPIO_ANYDL_POWERDOWN;
1231 } else {
1232 expected = 0;
1233 }
1234
1235 if (ch == DPIO_CH0)
1236 actual = val >> DPIO_ANYDL_POWERDOWN_SHIFT_CH0;
1237 else
1238 actual = val >> DPIO_ANYDL_POWERDOWN_SHIFT_CH1;
1239 actual &= DPIO_ALLDL_POWERDOWN | DPIO_ANYDL_POWERDOWN;
1240
1241 WARN(actual != expected,
1242 "Unexpected DPIO lane power down: all %d, any %d. Expected: all %d, any %d. (0x%x = 0x%08x)\n",
1243 !!(actual & DPIO_ALLDL_POWERDOWN), !!(actual & DPIO_ANYDL_POWERDOWN),
1244 !!(expected & DPIO_ALLDL_POWERDOWN), !!(expected & DPIO_ANYDL_POWERDOWN),
1245 reg, val);
1246 }
1247
1248 bool chv_phy_powergate_ch(struct drm_i915_private *dev_priv, enum dpio_phy phy,
1249 enum dpio_channel ch, bool override)
1250 {
1251 struct i915_power_domains *power_domains = &dev_priv->power_domains;
1252 bool was_override;
1253
1254 mutex_lock(&power_domains->lock);
1255
1256 was_override = dev_priv->chv_phy_control & PHY_CH_POWER_DOWN_OVRD_EN(phy, ch);
1257
1258 if (override == was_override)
1259 goto out;
1260
1261 if (override)
1262 dev_priv->chv_phy_control |= PHY_CH_POWER_DOWN_OVRD_EN(phy, ch);
1263 else
1264 dev_priv->chv_phy_control &= ~PHY_CH_POWER_DOWN_OVRD_EN(phy, ch);
1265
1266 I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control);
1267
1268 DRM_DEBUG_KMS("Power gating DPIO PHY%d CH%d (DPIO_PHY_CONTROL=0x%08x)\n",
1269 phy, ch, dev_priv->chv_phy_control);
1270
1271 assert_chv_phy_status(dev_priv);
1272
1273 out:
1274 mutex_unlock(&power_domains->lock);
1275
1276 return was_override;
1277 }
1278
1279 void chv_phy_powergate_lanes(struct intel_encoder *encoder,
1280 bool override, unsigned int mask)
1281 {
1282 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
1283 struct i915_power_domains *power_domains = &dev_priv->power_domains;
1284 enum dpio_phy phy = vlv_dport_to_phy(enc_to_dig_port(&encoder->base));
1285 enum dpio_channel ch = vlv_dport_to_channel(enc_to_dig_port(&encoder->base));
1286
1287 mutex_lock(&power_domains->lock);
1288
1289 dev_priv->chv_phy_control &= ~PHY_CH_POWER_DOWN_OVRD(0xf, phy, ch);
1290 dev_priv->chv_phy_control |= PHY_CH_POWER_DOWN_OVRD(mask, phy, ch);
1291
1292 if (override)
1293 dev_priv->chv_phy_control |= PHY_CH_POWER_DOWN_OVRD_EN(phy, ch);
1294 else
1295 dev_priv->chv_phy_control &= ~PHY_CH_POWER_DOWN_OVRD_EN(phy, ch);
1296
1297 I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control);
1298
1299 DRM_DEBUG_KMS("Power gating DPIO PHY%d CH%d lanes 0x%x (PHY_CONTROL=0x%08x)\n",
1300 phy, ch, mask, dev_priv->chv_phy_control);
1301
1302 assert_chv_phy_status(dev_priv);
1303
1304 assert_chv_phy_powergate(dev_priv, phy, ch, override, mask);
1305
1306 mutex_unlock(&power_domains->lock);
1307 }
1308
1309 static bool chv_pipe_power_well_enabled(struct drm_i915_private *dev_priv,
1310 struct i915_power_well *power_well)
1311 {
1312 enum pipe pipe = power_well->data;
1313 bool enabled;
1314 u32 state, ctrl;
1315
1316 mutex_lock(&dev_priv->rps.hw_lock);
1317
1318 state = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) & DP_SSS_MASK(pipe);
1319 /*
1320 * We only ever set the power-on and power-gate states, anything
1321 * else is unexpected.
1322 */
1323 WARN_ON(state != DP_SSS_PWR_ON(pipe) && state != DP_SSS_PWR_GATE(pipe));
1324 enabled = state == DP_SSS_PWR_ON(pipe);
1325
1326 /*
1327 * A transient state at this point would mean some unexpected party
1328 * is poking at the power controls too.
1329 */
1330 ctrl = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) & DP_SSC_MASK(pipe);
1331 WARN_ON(ctrl << 16 != state);
1332
1333 mutex_unlock(&dev_priv->rps.hw_lock);
1334
1335 return enabled;
1336 }
1337
1338 static void chv_set_pipe_power_well(struct drm_i915_private *dev_priv,
1339 struct i915_power_well *power_well,
1340 bool enable)
1341 {
1342 enum pipe pipe = power_well->data;
1343 u32 state;
1344 u32 ctrl;
1345
1346 state = enable ? DP_SSS_PWR_ON(pipe) : DP_SSS_PWR_GATE(pipe);
1347
1348 mutex_lock(&dev_priv->rps.hw_lock);
1349
1350 #define COND \
1351 ((vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) & DP_SSS_MASK(pipe)) == state)
1352
1353 if (COND)
1354 goto out;
1355
1356 ctrl = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ);
1357 ctrl &= ~DP_SSC_MASK(pipe);
1358 ctrl |= enable ? DP_SSC_PWR_ON(pipe) : DP_SSC_PWR_GATE(pipe);
1359 vlv_punit_write(dev_priv, PUNIT_REG_DSPFREQ, ctrl);
1360
1361 if (wait_for(COND, 100))
1362 DRM_ERROR("timeout setting power well state %08x (%08x)\n",
1363 state,
1364 vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ));
1365
1366 #undef COND
1367
1368 out:
1369 mutex_unlock(&dev_priv->rps.hw_lock);
1370 }
1371
1372 static void chv_pipe_power_well_sync_hw(struct drm_i915_private *dev_priv,
1373 struct i915_power_well *power_well)
1374 {
1375 WARN_ON_ONCE(power_well->data != PIPE_A);
1376
1377 chv_set_pipe_power_well(dev_priv, power_well, power_well->count > 0);
1378 }
1379
1380 static void chv_pipe_power_well_enable(struct drm_i915_private *dev_priv,
1381 struct i915_power_well *power_well)
1382 {
1383 WARN_ON_ONCE(power_well->data != PIPE_A);
1384
1385 chv_set_pipe_power_well(dev_priv, power_well, true);
1386
1387 vlv_display_power_well_init(dev_priv);
1388 }
1389
1390 static void chv_pipe_power_well_disable(struct drm_i915_private *dev_priv,
1391 struct i915_power_well *power_well)
1392 {
1393 WARN_ON_ONCE(power_well->data != PIPE_A);
1394
1395 vlv_display_power_well_deinit(dev_priv);
1396
1397 chv_set_pipe_power_well(dev_priv, power_well, false);
1398 }
1399
1400 /**
1401 * intel_display_power_get - grab a power domain reference
1402 * @dev_priv: i915 device instance
1403 * @domain: power domain to reference
1404 *
1405 * This function grabs a power domain reference for @domain and ensures that the
1406 * power domain and all its parents are powered up. Therefore users should only
1407 * grab a reference to the innermost power domain they need.
1408 *
1409 * Any power domain reference obtained by this function must have a symmetric
1410 * call to intel_display_power_put() to release the reference again.
1411 */
1412 void intel_display_power_get(struct drm_i915_private *dev_priv,
1413 enum intel_display_power_domain domain)
1414 {
1415 struct i915_power_domains *power_domains;
1416 struct i915_power_well *power_well;
1417 int i;
1418
1419 intel_runtime_pm_get(dev_priv);
1420
1421 power_domains = &dev_priv->power_domains;
1422
1423 mutex_lock(&power_domains->lock);
1424
1425 for_each_power_well(i, power_well, BIT(domain), power_domains) {
1426 if (!power_well->count++)
1427 intel_power_well_enable(dev_priv, power_well);
1428 }
1429
1430 power_domains->domain_use_count[domain]++;
1431
1432 mutex_unlock(&power_domains->lock);
1433 }
1434
1435 /**
1436 * intel_display_power_put - release a power domain reference
1437 * @dev_priv: i915 device instance
1438 * @domain: power domain to reference
1439 *
1440 * This function drops the power domain reference obtained by
1441 * intel_display_power_get() and might power down the corresponding hardware
1442 * block right away if this is the last reference.
1443 */
1444 void intel_display_power_put(struct drm_i915_private *dev_priv,
1445 enum intel_display_power_domain domain)
1446 {
1447 struct i915_power_domains *power_domains;
1448 struct i915_power_well *power_well;
1449 int i;
1450
1451 power_domains = &dev_priv->power_domains;
1452
1453 mutex_lock(&power_domains->lock);
1454
1455 WARN_ON(!power_domains->domain_use_count[domain]);
1456 power_domains->domain_use_count[domain]--;
1457
1458 for_each_power_well_rev(i, power_well, BIT(domain), power_domains) {
1459 WARN_ON(!power_well->count);
1460
1461 if (!--power_well->count && i915.disable_power_well)
1462 intel_power_well_disable(dev_priv, power_well);
1463 }
1464
1465 mutex_unlock(&power_domains->lock);
1466
1467 intel_runtime_pm_put(dev_priv);
1468 }
1469
1470 #define HSW_ALWAYS_ON_POWER_DOMAINS ( \
1471 BIT(POWER_DOMAIN_PIPE_A) | \
1472 BIT(POWER_DOMAIN_TRANSCODER_EDP) | \
1473 BIT(POWER_DOMAIN_PORT_DDI_A_2_LANES) | \
1474 BIT(POWER_DOMAIN_PORT_DDI_A_4_LANES) | \
1475 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \
1476 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \
1477 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \
1478 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \
1479 BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) | \
1480 BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) | \
1481 BIT(POWER_DOMAIN_PORT_CRT) | \
1482 BIT(POWER_DOMAIN_PLLS) | \
1483 BIT(POWER_DOMAIN_AUX_A) | \
1484 BIT(POWER_DOMAIN_AUX_B) | \
1485 BIT(POWER_DOMAIN_AUX_C) | \
1486 BIT(POWER_DOMAIN_AUX_D) | \
1487 BIT(POWER_DOMAIN_GMBUS) | \
1488 BIT(POWER_DOMAIN_INIT))
1489 #define HSW_DISPLAY_POWER_DOMAINS ( \
1490 (POWER_DOMAIN_MASK & ~HSW_ALWAYS_ON_POWER_DOMAINS) | \
1491 BIT(POWER_DOMAIN_INIT))
1492
1493 #define BDW_ALWAYS_ON_POWER_DOMAINS ( \
1494 HSW_ALWAYS_ON_POWER_DOMAINS | \
1495 BIT(POWER_DOMAIN_PIPE_A_PANEL_FITTER))
1496 #define BDW_DISPLAY_POWER_DOMAINS ( \
1497 (POWER_DOMAIN_MASK & ~BDW_ALWAYS_ON_POWER_DOMAINS) | \
1498 BIT(POWER_DOMAIN_INIT))
1499
1500 #define VLV_ALWAYS_ON_POWER_DOMAINS BIT(POWER_DOMAIN_INIT)
1501 #define VLV_DISPLAY_POWER_DOMAINS POWER_DOMAIN_MASK
1502
1503 #define VLV_DPIO_CMN_BC_POWER_DOMAINS ( \
1504 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \
1505 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \
1506 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \
1507 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \
1508 BIT(POWER_DOMAIN_PORT_CRT) | \
1509 BIT(POWER_DOMAIN_AUX_B) | \
1510 BIT(POWER_DOMAIN_AUX_C) | \
1511 BIT(POWER_DOMAIN_INIT))
1512
1513 #define VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS ( \
1514 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \
1515 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \
1516 BIT(POWER_DOMAIN_AUX_B) | \
1517 BIT(POWER_DOMAIN_INIT))
1518
1519 #define VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS ( \
1520 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \
1521 BIT(POWER_DOMAIN_AUX_B) | \
1522 BIT(POWER_DOMAIN_INIT))
1523
1524 #define VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS ( \
1525 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \
1526 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \
1527 BIT(POWER_DOMAIN_AUX_C) | \
1528 BIT(POWER_DOMAIN_INIT))
1529
1530 #define VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS ( \
1531 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \
1532 BIT(POWER_DOMAIN_AUX_C) | \
1533 BIT(POWER_DOMAIN_INIT))
1534
1535 #define CHV_DPIO_CMN_BC_POWER_DOMAINS ( \
1536 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \
1537 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \
1538 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \
1539 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \
1540 BIT(POWER_DOMAIN_AUX_B) | \
1541 BIT(POWER_DOMAIN_AUX_C) | \
1542 BIT(POWER_DOMAIN_INIT))
1543
1544 #define CHV_DPIO_CMN_D_POWER_DOMAINS ( \
1545 BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) | \
1546 BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) | \
1547 BIT(POWER_DOMAIN_AUX_D) | \
1548 BIT(POWER_DOMAIN_INIT))
1549
1550 static const struct i915_power_well_ops i9xx_always_on_power_well_ops = {
1551 .sync_hw = i9xx_always_on_power_well_noop,
1552 .enable = i9xx_always_on_power_well_noop,
1553 .disable = i9xx_always_on_power_well_noop,
1554 .is_enabled = i9xx_always_on_power_well_enabled,
1555 };
1556
1557 static const struct i915_power_well_ops chv_pipe_power_well_ops = {
1558 .sync_hw = chv_pipe_power_well_sync_hw,
1559 .enable = chv_pipe_power_well_enable,
1560 .disable = chv_pipe_power_well_disable,
1561 .is_enabled = chv_pipe_power_well_enabled,
1562 };
1563
1564 static const struct i915_power_well_ops chv_dpio_cmn_power_well_ops = {
1565 .sync_hw = vlv_power_well_sync_hw,
1566 .enable = chv_dpio_cmn_power_well_enable,
1567 .disable = chv_dpio_cmn_power_well_disable,
1568 .is_enabled = vlv_power_well_enabled,
1569 };
1570
1571 static struct i915_power_well i9xx_always_on_power_well[] = {
1572 {
1573 .name = "always-on",
1574 .always_on = 1,
1575 .domains = POWER_DOMAIN_MASK,
1576 .ops = &i9xx_always_on_power_well_ops,
1577 },
1578 };
1579
1580 static const struct i915_power_well_ops hsw_power_well_ops = {
1581 .sync_hw = hsw_power_well_sync_hw,
1582 .enable = hsw_power_well_enable,
1583 .disable = hsw_power_well_disable,
1584 .is_enabled = hsw_power_well_enabled,
1585 };
1586
1587 static const struct i915_power_well_ops skl_power_well_ops = {
1588 .sync_hw = skl_power_well_sync_hw,
1589 .enable = skl_power_well_enable,
1590 .disable = skl_power_well_disable,
1591 .is_enabled = skl_power_well_enabled,
1592 };
1593
1594 static struct i915_power_well hsw_power_wells[] = {
1595 {
1596 .name = "always-on",
1597 .always_on = 1,
1598 .domains = HSW_ALWAYS_ON_POWER_DOMAINS,
1599 .ops = &i9xx_always_on_power_well_ops,
1600 },
1601 {
1602 .name = "display",
1603 .domains = HSW_DISPLAY_POWER_DOMAINS,
1604 .ops = &hsw_power_well_ops,
1605 },
1606 };
1607
1608 static struct i915_power_well bdw_power_wells[] = {
1609 {
1610 .name = "always-on",
1611 .always_on = 1,
1612 .domains = BDW_ALWAYS_ON_POWER_DOMAINS,
1613 .ops = &i9xx_always_on_power_well_ops,
1614 },
1615 {
1616 .name = "display",
1617 .domains = BDW_DISPLAY_POWER_DOMAINS,
1618 .ops = &hsw_power_well_ops,
1619 },
1620 };
1621
1622 static const struct i915_power_well_ops vlv_display_power_well_ops = {
1623 .sync_hw = vlv_power_well_sync_hw,
1624 .enable = vlv_display_power_well_enable,
1625 .disable = vlv_display_power_well_disable,
1626 .is_enabled = vlv_power_well_enabled,
1627 };
1628
1629 static const struct i915_power_well_ops vlv_dpio_cmn_power_well_ops = {
1630 .sync_hw = vlv_power_well_sync_hw,
1631 .enable = vlv_dpio_cmn_power_well_enable,
1632 .disable = vlv_dpio_cmn_power_well_disable,
1633 .is_enabled = vlv_power_well_enabled,
1634 };
1635
1636 static const struct i915_power_well_ops vlv_dpio_power_well_ops = {
1637 .sync_hw = vlv_power_well_sync_hw,
1638 .enable = vlv_power_well_enable,
1639 .disable = vlv_power_well_disable,
1640 .is_enabled = vlv_power_well_enabled,
1641 };
1642
1643 static struct i915_power_well vlv_power_wells[] = {
1644 {
1645 .name = "always-on",
1646 .always_on = 1,
1647 .domains = VLV_ALWAYS_ON_POWER_DOMAINS,
1648 .ops = &i9xx_always_on_power_well_ops,
1649 },
1650 {
1651 .name = "display",
1652 .domains = VLV_DISPLAY_POWER_DOMAINS,
1653 .data = PUNIT_POWER_WELL_DISP2D,
1654 .ops = &vlv_display_power_well_ops,
1655 },
1656 {
1657 .name = "dpio-tx-b-01",
1658 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS |
1659 VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS |
1660 VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS |
1661 VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
1662 .ops = &vlv_dpio_power_well_ops,
1663 .data = PUNIT_POWER_WELL_DPIO_TX_B_LANES_01,
1664 },
1665 {
1666 .name = "dpio-tx-b-23",
1667 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS |
1668 VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS |
1669 VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS |
1670 VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
1671 .ops = &vlv_dpio_power_well_ops,
1672 .data = PUNIT_POWER_WELL_DPIO_TX_B_LANES_23,
1673 },
1674 {
1675 .name = "dpio-tx-c-01",
1676 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS |
1677 VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS |
1678 VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS |
1679 VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
1680 .ops = &vlv_dpio_power_well_ops,
1681 .data = PUNIT_POWER_WELL_DPIO_TX_C_LANES_01,
1682 },
1683 {
1684 .name = "dpio-tx-c-23",
1685 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS |
1686 VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS |
1687 VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS |
1688 VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
1689 .ops = &vlv_dpio_power_well_ops,
1690 .data = PUNIT_POWER_WELL_DPIO_TX_C_LANES_23,
1691 },
1692 {
1693 .name = "dpio-common",
1694 .domains = VLV_DPIO_CMN_BC_POWER_DOMAINS,
1695 .data = PUNIT_POWER_WELL_DPIO_CMN_BC,
1696 .ops = &vlv_dpio_cmn_power_well_ops,
1697 },
1698 };
1699
1700 static struct i915_power_well chv_power_wells[] = {
1701 {
1702 .name = "always-on",
1703 .always_on = 1,
1704 .domains = VLV_ALWAYS_ON_POWER_DOMAINS,
1705 .ops = &i9xx_always_on_power_well_ops,
1706 },
1707 {
1708 .name = "display",
1709 /*
1710 * Pipe A power well is the new disp2d well. Pipe B and C
1711 * power wells don't actually exist. Pipe A power well is
1712 * required for any pipe to work.
1713 */
1714 .domains = VLV_DISPLAY_POWER_DOMAINS,
1715 .data = PIPE_A,
1716 .ops = &chv_pipe_power_well_ops,
1717 },
1718 {
1719 .name = "dpio-common-bc",
1720 .domains = CHV_DPIO_CMN_BC_POWER_DOMAINS,
1721 .data = PUNIT_POWER_WELL_DPIO_CMN_BC,
1722 .ops = &chv_dpio_cmn_power_well_ops,
1723 },
1724 {
1725 .name = "dpio-common-d",
1726 .domains = CHV_DPIO_CMN_D_POWER_DOMAINS,
1727 .data = PUNIT_POWER_WELL_DPIO_CMN_D,
1728 .ops = &chv_dpio_cmn_power_well_ops,
1729 },
1730 };
1731
1732 bool intel_display_power_well_is_enabled(struct drm_i915_private *dev_priv,
1733 int power_well_id)
1734 {
1735 struct i915_power_well *power_well;
1736 bool ret;
1737
1738 power_well = lookup_power_well(dev_priv, power_well_id);
1739 ret = power_well->ops->is_enabled(dev_priv, power_well);
1740
1741 return ret;
1742 }
1743
1744 static struct i915_power_well skl_power_wells[] = {
1745 {
1746 .name = "always-on",
1747 .always_on = 1,
1748 .domains = SKL_DISPLAY_ALWAYS_ON_POWER_DOMAINS,
1749 .ops = &i9xx_always_on_power_well_ops,
1750 },
1751 {
1752 .name = "power well 1",
1753 .domains = SKL_DISPLAY_POWERWELL_1_POWER_DOMAINS,
1754 .ops = &skl_power_well_ops,
1755 .data = SKL_DISP_PW_1,
1756 },
1757 {
1758 .name = "MISC IO power well",
1759 .domains = SKL_DISPLAY_MISC_IO_POWER_DOMAINS,
1760 .ops = &skl_power_well_ops,
1761 .data = SKL_DISP_PW_MISC_IO,
1762 },
1763 {
1764 .name = "power well 2",
1765 .domains = SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS,
1766 .ops = &skl_power_well_ops,
1767 .data = SKL_DISP_PW_2,
1768 },
1769 {
1770 .name = "DDI A/E power well",
1771 .domains = SKL_DISPLAY_DDI_A_E_POWER_DOMAINS,
1772 .ops = &skl_power_well_ops,
1773 .data = SKL_DISP_PW_DDI_A_E,
1774 },
1775 {
1776 .name = "DDI B power well",
1777 .domains = SKL_DISPLAY_DDI_B_POWER_DOMAINS,
1778 .ops = &skl_power_well_ops,
1779 .data = SKL_DISP_PW_DDI_B,
1780 },
1781 {
1782 .name = "DDI C power well",
1783 .domains = SKL_DISPLAY_DDI_C_POWER_DOMAINS,
1784 .ops = &skl_power_well_ops,
1785 .data = SKL_DISP_PW_DDI_C,
1786 },
1787 {
1788 .name = "DDI D power well",
1789 .domains = SKL_DISPLAY_DDI_D_POWER_DOMAINS,
1790 .ops = &skl_power_well_ops,
1791 .data = SKL_DISP_PW_DDI_D,
1792 },
1793 };
1794
1795 static struct i915_power_well bxt_power_wells[] = {
1796 {
1797 .name = "always-on",
1798 .always_on = 1,
1799 .domains = BXT_DISPLAY_ALWAYS_ON_POWER_DOMAINS,
1800 .ops = &i9xx_always_on_power_well_ops,
1801 },
1802 {
1803 .name = "power well 1",
1804 .domains = BXT_DISPLAY_POWERWELL_1_POWER_DOMAINS,
1805 .ops = &skl_power_well_ops,
1806 .data = SKL_DISP_PW_1,
1807 },
1808 {
1809 .name = "power well 2",
1810 .domains = BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS,
1811 .ops = &skl_power_well_ops,
1812 .data = SKL_DISP_PW_2,
1813 }
1814 };
1815
1816 static int
1817 sanitize_disable_power_well_option(const struct drm_i915_private *dev_priv,
1818 int disable_power_well)
1819 {
1820 if (disable_power_well >= 0)
1821 return !!disable_power_well;
1822
1823 if (IS_SKYLAKE(dev_priv)) {
1824 DRM_DEBUG_KMS("Disabling display power well support\n");
1825 return 0;
1826 }
1827
1828 return 1;
1829 }
1830
1831 #define set_power_wells(power_domains, __power_wells) ({ \
1832 (power_domains)->power_wells = (__power_wells); \
1833 (power_domains)->power_well_count = ARRAY_SIZE(__power_wells); \
1834 })
1835
1836 /**
1837 * intel_power_domains_init - initializes the power domain structures
1838 * @dev_priv: i915 device instance
1839 *
1840 * Initializes the power domain structures for @dev_priv depending upon the
1841 * supported platform.
1842 */
1843 int intel_power_domains_init(struct drm_i915_private *dev_priv)
1844 {
1845 struct i915_power_domains *power_domains = &dev_priv->power_domains;
1846
1847 i915.disable_power_well = sanitize_disable_power_well_option(dev_priv,
1848 i915.disable_power_well);
1849
1850 BUILD_BUG_ON(POWER_DOMAIN_NUM > 31);
1851
1852 mutex_init(&power_domains->lock);
1853
1854 /*
1855 * The enabling order will be from lower to higher indexed wells,
1856 * the disabling order is reversed.
1857 */
1858 if (IS_HASWELL(dev_priv->dev)) {
1859 set_power_wells(power_domains, hsw_power_wells);
1860 } else if (IS_BROADWELL(dev_priv->dev)) {
1861 set_power_wells(power_domains, bdw_power_wells);
1862 } else if (IS_SKYLAKE(dev_priv->dev)) {
1863 set_power_wells(power_domains, skl_power_wells);
1864 } else if (IS_BROXTON(dev_priv->dev)) {
1865 set_power_wells(power_domains, bxt_power_wells);
1866 } else if (IS_CHERRYVIEW(dev_priv->dev)) {
1867 set_power_wells(power_domains, chv_power_wells);
1868 } else if (IS_VALLEYVIEW(dev_priv->dev)) {
1869 set_power_wells(power_domains, vlv_power_wells);
1870 } else {
1871 set_power_wells(power_domains, i9xx_always_on_power_well);
1872 }
1873
1874 return 0;
1875 }
1876
1877 static void intel_runtime_pm_disable(struct drm_i915_private *dev_priv)
1878 {
1879 struct drm_device *dev = dev_priv->dev;
1880 struct device *device = &dev->pdev->dev;
1881
1882 if (!HAS_RUNTIME_PM(dev))
1883 return;
1884
1885 if (!intel_enable_rc6(dev))
1886 return;
1887
1888 /* Make sure we're not suspended first. */
1889 pm_runtime_get_sync(device);
1890 }
1891
1892 /**
1893 * intel_power_domains_fini - finalizes the power domain structures
1894 * @dev_priv: i915 device instance
1895 *
1896 * Finalizes the power domain structures for @dev_priv depending upon the
1897 * supported platform. This function also disables runtime pm and ensures that
1898 * the device stays powered up so that the driver can be reloaded.
1899 */
1900 void intel_power_domains_fini(struct drm_i915_private *dev_priv)
1901 {
1902 intel_runtime_pm_disable(dev_priv);
1903
1904 /* The i915.ko module is still not prepared to be loaded when
1905 * the power well is not enabled, so just enable it in case
1906 * we're going to unload/reload. */
1907 intel_display_set_init_power(dev_priv, true);
1908 }
1909
1910 static void intel_power_domains_resume(struct drm_i915_private *dev_priv)
1911 {
1912 struct i915_power_domains *power_domains = &dev_priv->power_domains;
1913 struct i915_power_well *power_well;
1914 int i;
1915
1916 mutex_lock(&power_domains->lock);
1917 for_each_power_well(i, power_well, POWER_DOMAIN_MASK, power_domains) {
1918 power_well->ops->sync_hw(dev_priv, power_well);
1919 power_well->hw_enabled = power_well->ops->is_enabled(dev_priv,
1920 power_well);
1921 }
1922 mutex_unlock(&power_domains->lock);
1923 }
1924
1925 static void chv_phy_control_init(struct drm_i915_private *dev_priv)
1926 {
1927 struct i915_power_well *cmn_bc =
1928 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_BC);
1929 struct i915_power_well *cmn_d =
1930 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_D);
1931
1932 /*
1933 * DISPLAY_PHY_CONTROL can get corrupted if read. As a
1934 * workaround never ever read DISPLAY_PHY_CONTROL, and
1935 * instead maintain a shadow copy ourselves. Use the actual
1936 * power well state and lane status to reconstruct the
1937 * expected initial value.
1938 */
1939 dev_priv->chv_phy_control =
1940 PHY_LDO_SEQ_DELAY(PHY_LDO_DELAY_600NS, DPIO_PHY0) |
1941 PHY_LDO_SEQ_DELAY(PHY_LDO_DELAY_600NS, DPIO_PHY1) |
1942 PHY_CH_POWER_MODE(PHY_CH_DEEP_PSR, DPIO_PHY0, DPIO_CH0) |
1943 PHY_CH_POWER_MODE(PHY_CH_DEEP_PSR, DPIO_PHY0, DPIO_CH1) |
1944 PHY_CH_POWER_MODE(PHY_CH_DEEP_PSR, DPIO_PHY1, DPIO_CH0);
1945
1946 /*
1947 * If all lanes are disabled we leave the override disabled
1948 * with all power down bits cleared to match the state we
1949 * would use after disabling the port. Otherwise enable the
1950 * override and set the lane powerdown bits accding to the
1951 * current lane status.
1952 */
1953 if (cmn_bc->ops->is_enabled(dev_priv, cmn_bc)) {
1954 uint32_t status = I915_READ(DPLL(PIPE_A));
1955 unsigned int mask;
1956
1957 mask = status & DPLL_PORTB_READY_MASK;
1958 if (mask == 0xf)
1959 mask = 0x0;
1960 else
1961 dev_priv->chv_phy_control |=
1962 PHY_CH_POWER_DOWN_OVRD_EN(DPIO_PHY0, DPIO_CH0);
1963
1964 dev_priv->chv_phy_control |=
1965 PHY_CH_POWER_DOWN_OVRD(mask, DPIO_PHY0, DPIO_CH0);
1966
1967 mask = (status & DPLL_PORTC_READY_MASK) >> 4;
1968 if (mask == 0xf)
1969 mask = 0x0;
1970 else
1971 dev_priv->chv_phy_control |=
1972 PHY_CH_POWER_DOWN_OVRD_EN(DPIO_PHY0, DPIO_CH1);
1973
1974 dev_priv->chv_phy_control |=
1975 PHY_CH_POWER_DOWN_OVRD(mask, DPIO_PHY0, DPIO_CH1);
1976
1977 dev_priv->chv_phy_control |= PHY_COM_LANE_RESET_DEASSERT(DPIO_PHY0);
1978
1979 dev_priv->chv_phy_assert[DPIO_PHY0] = false;
1980 } else {
1981 dev_priv->chv_phy_assert[DPIO_PHY0] = true;
1982 }
1983
1984 if (cmn_d->ops->is_enabled(dev_priv, cmn_d)) {
1985 uint32_t status = I915_READ(DPIO_PHY_STATUS);
1986 unsigned int mask;
1987
1988 mask = status & DPLL_PORTD_READY_MASK;
1989
1990 if (mask == 0xf)
1991 mask = 0x0;
1992 else
1993 dev_priv->chv_phy_control |=
1994 PHY_CH_POWER_DOWN_OVRD_EN(DPIO_PHY1, DPIO_CH0);
1995
1996 dev_priv->chv_phy_control |=
1997 PHY_CH_POWER_DOWN_OVRD(mask, DPIO_PHY1, DPIO_CH0);
1998
1999 dev_priv->chv_phy_control |= PHY_COM_LANE_RESET_DEASSERT(DPIO_PHY1);
2000
2001 dev_priv->chv_phy_assert[DPIO_PHY1] = false;
2002 } else {
2003 dev_priv->chv_phy_assert[DPIO_PHY1] = true;
2004 }
2005
2006 I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control);
2007
2008 DRM_DEBUG_KMS("Initial PHY_CONTROL=0x%08x\n",
2009 dev_priv->chv_phy_control);
2010 }
2011
2012 static void vlv_cmnlane_wa(struct drm_i915_private *dev_priv)
2013 {
2014 struct i915_power_well *cmn =
2015 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_BC);
2016 struct i915_power_well *disp2d =
2017 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DISP2D);
2018
2019 /* If the display might be already active skip this */
2020 if (cmn->ops->is_enabled(dev_priv, cmn) &&
2021 disp2d->ops->is_enabled(dev_priv, disp2d) &&
2022 I915_READ(DPIO_CTL) & DPIO_CMNRST)
2023 return;
2024
2025 DRM_DEBUG_KMS("toggling display PHY side reset\n");
2026
2027 /* cmnlane needs DPLL registers */
2028 disp2d->ops->enable(dev_priv, disp2d);
2029
2030 /*
2031 * From VLV2A0_DP_eDP_HDMI_DPIO_driver_vbios_notes_11.docx:
2032 * Need to assert and de-assert PHY SB reset by gating the
2033 * common lane power, then un-gating it.
2034 * Simply ungating isn't enough to reset the PHY enough to get
2035 * ports and lanes running.
2036 */
2037 cmn->ops->disable(dev_priv, cmn);
2038 }
2039
2040 /**
2041 * intel_power_domains_init_hw - initialize hardware power domain state
2042 * @dev_priv: i915 device instance
2043 *
2044 * This function initializes the hardware power domain state and enables all
2045 * power domains using intel_display_set_init_power().
2046 */
2047 void intel_power_domains_init_hw(struct drm_i915_private *dev_priv)
2048 {
2049 struct drm_device *dev = dev_priv->dev;
2050 struct i915_power_domains *power_domains = &dev_priv->power_domains;
2051
2052 power_domains->initializing = true;
2053
2054 if (IS_CHERRYVIEW(dev)) {
2055 mutex_lock(&power_domains->lock);
2056 chv_phy_control_init(dev_priv);
2057 mutex_unlock(&power_domains->lock);
2058 } else if (IS_VALLEYVIEW(dev)) {
2059 mutex_lock(&power_domains->lock);
2060 vlv_cmnlane_wa(dev_priv);
2061 mutex_unlock(&power_domains->lock);
2062 }
2063
2064 /* For now, we need the power well to be always enabled. */
2065 intel_display_set_init_power(dev_priv, true);
2066 intel_power_domains_resume(dev_priv);
2067 power_domains->initializing = false;
2068 }
2069
2070 /**
2071 * intel_runtime_pm_get - grab a runtime pm reference
2072 * @dev_priv: i915 device instance
2073 *
2074 * This function grabs a device-level runtime pm reference (mostly used for GEM
2075 * code to ensure the GTT or GT is on) and ensures that it is powered up.
2076 *
2077 * Any runtime pm reference obtained by this function must have a symmetric
2078 * call to intel_runtime_pm_put() to release the reference again.
2079 */
2080 void intel_runtime_pm_get(struct drm_i915_private *dev_priv)
2081 {
2082 struct drm_device *dev = dev_priv->dev;
2083 struct device *device = &dev->pdev->dev;
2084
2085 if (!HAS_RUNTIME_PM(dev))
2086 return;
2087
2088 pm_runtime_get_sync(device);
2089 WARN(dev_priv->pm.suspended, "Device still suspended.\n");
2090 }
2091
2092 /**
2093 * intel_runtime_pm_get_noresume - grab a runtime pm reference
2094 * @dev_priv: i915 device instance
2095 *
2096 * This function grabs a device-level runtime pm reference (mostly used for GEM
2097 * code to ensure the GTT or GT is on).
2098 *
2099 * It will _not_ power up the device but instead only check that it's powered
2100 * on. Therefore it is only valid to call this functions from contexts where
2101 * the device is known to be powered up and where trying to power it up would
2102 * result in hilarity and deadlocks. That pretty much means only the system
2103 * suspend/resume code where this is used to grab runtime pm references for
2104 * delayed setup down in work items.
2105 *
2106 * Any runtime pm reference obtained by this function must have a symmetric
2107 * call to intel_runtime_pm_put() to release the reference again.
2108 */
2109 void intel_runtime_pm_get_noresume(struct drm_i915_private *dev_priv)
2110 {
2111 struct drm_device *dev = dev_priv->dev;
2112 struct device *device = &dev->pdev->dev;
2113
2114 if (!HAS_RUNTIME_PM(dev))
2115 return;
2116
2117 WARN(dev_priv->pm.suspended, "Getting nosync-ref while suspended.\n");
2118 pm_runtime_get_noresume(device);
2119 }
2120
2121 /**
2122 * intel_runtime_pm_put - release a runtime pm reference
2123 * @dev_priv: i915 device instance
2124 *
2125 * This function drops the device-level runtime pm reference obtained by
2126 * intel_runtime_pm_get() and might power down the corresponding
2127 * hardware block right away if this is the last reference.
2128 */
2129 void intel_runtime_pm_put(struct drm_i915_private *dev_priv)
2130 {
2131 struct drm_device *dev = dev_priv->dev;
2132 struct device *device = &dev->pdev->dev;
2133
2134 if (!HAS_RUNTIME_PM(dev))
2135 return;
2136
2137 pm_runtime_mark_last_busy(device);
2138 pm_runtime_put_autosuspend(device);
2139 }
2140
2141 /**
2142 * intel_runtime_pm_enable - enable runtime pm
2143 * @dev_priv: i915 device instance
2144 *
2145 * This function enables runtime pm at the end of the driver load sequence.
2146 *
2147 * Note that this function does currently not enable runtime pm for the
2148 * subordinate display power domains. That is only done on the first modeset
2149 * using intel_display_set_init_power().
2150 */
2151 void intel_runtime_pm_enable(struct drm_i915_private *dev_priv)
2152 {
2153 struct drm_device *dev = dev_priv->dev;
2154 struct device *device = &dev->pdev->dev;
2155
2156 if (!HAS_RUNTIME_PM(dev))
2157 return;
2158
2159 /*
2160 * RPM depends on RC6 to save restore the GT HW context, so make RC6 a
2161 * requirement.
2162 */
2163 if (!intel_enable_rc6(dev)) {
2164 DRM_INFO("RC6 disabled, disabling runtime PM support\n");
2165 return;
2166 }
2167
2168 pm_runtime_set_autosuspend_delay(device, 10000); /* 10s */
2169 pm_runtime_mark_last_busy(device);
2170 pm_runtime_use_autosuspend(device);
2171
2172 pm_runtime_put_autosuspend(device);
2173 }
2174
Linux with added FPC-III support