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drm/i915: Skip CHV PHY asserts until PHY has been fully reset
[deliverable/linux.git] / drivers / gpu / drm / i915 / intel_runtime_pm.c
1 /*
2 * Copyright © 2012-2014 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 *
23 * Authors:
24 * Eugeni Dodonov <eugeni.dodonov@intel.com>
25 * Daniel Vetter <daniel.vetter@ffwll.ch>
26 *
27 */
28
29 #include <linux/pm_runtime.h>
30 #include <linux/vgaarb.h>
31
32 #include "i915_drv.h"
33 #include "intel_drv.h"
34
35 /**
36 * DOC: runtime pm
37 *
38 * The i915 driver supports dynamic enabling and disabling of entire hardware
39 * blocks at runtime. This is especially important on the display side where
40 * software is supposed to control many power gates manually on recent hardware,
41 * since on the GT side a lot of the power management is done by the hardware.
42 * But even there some manual control at the device level is required.
43 *
44 * Since i915 supports a diverse set of platforms with a unified codebase and
45 * hardware engineers just love to shuffle functionality around between power
46 * domains there's a sizeable amount of indirection required. This file provides
47 * generic functions to the driver for grabbing and releasing references for
48 * abstract power domains. It then maps those to the actual power wells
49 * present for a given platform.
50 */
51
52 #define GEN9_ENABLE_DC5(dev) 0
53 #define SKL_ENABLE_DC6(dev) IS_SKYLAKE(dev)
54
55 #define for_each_power_well(i, power_well, domain_mask, power_domains) \
56 for (i = 0; \
57 i < (power_domains)->power_well_count && \
58 ((power_well) = &(power_domains)->power_wells[i]); \
59 i++) \
60 if ((power_well)->domains & (domain_mask))
61
62 #define for_each_power_well_rev(i, power_well, domain_mask, power_domains) \
63 for (i = (power_domains)->power_well_count - 1; \
64 i >= 0 && ((power_well) = &(power_domains)->power_wells[i]);\
65 i--) \
66 if ((power_well)->domains & (domain_mask))
67
68 bool intel_display_power_well_is_enabled(struct drm_i915_private *dev_priv,
69 int power_well_id);
70
71 static void intel_power_well_enable(struct drm_i915_private *dev_priv,
72 struct i915_power_well *power_well)
73 {
74 DRM_DEBUG_KMS("enabling %s\n", power_well->name);
75 power_well->ops->enable(dev_priv, power_well);
76 power_well->hw_enabled = true;
77 }
78
79 static void intel_power_well_disable(struct drm_i915_private *dev_priv,
80 struct i915_power_well *power_well)
81 {
82 DRM_DEBUG_KMS("disabling %s\n", power_well->name);
83 power_well->hw_enabled = false;
84 power_well->ops->disable(dev_priv, power_well);
85 }
86
87 /*
88 * We should only use the power well if we explicitly asked the hardware to
89 * enable it, so check if it's enabled and also check if we've requested it to
90 * be enabled.
91 */
92 static bool hsw_power_well_enabled(struct drm_i915_private *dev_priv,
93 struct i915_power_well *power_well)
94 {
95 return I915_READ(HSW_PWR_WELL_DRIVER) ==
96 (HSW_PWR_WELL_ENABLE_REQUEST | HSW_PWR_WELL_STATE_ENABLED);
97 }
98
99 /**
100 * __intel_display_power_is_enabled - unlocked check for a power domain
101 * @dev_priv: i915 device instance
102 * @domain: power domain to check
103 *
104 * This is the unlocked version of intel_display_power_is_enabled() and should
105 * only be used from error capture and recovery code where deadlocks are
106 * possible.
107 *
108 * Returns:
109 * True when the power domain is enabled, false otherwise.
110 */
111 bool __intel_display_power_is_enabled(struct drm_i915_private *dev_priv,
112 enum intel_display_power_domain domain)
113 {
114 struct i915_power_domains *power_domains;
115 struct i915_power_well *power_well;
116 bool is_enabled;
117 int i;
118
119 if (dev_priv->pm.suspended)
120 return false;
121
122 power_domains = &dev_priv->power_domains;
123
124 is_enabled = true;
125
126 for_each_power_well_rev(i, power_well, BIT(domain), power_domains) {
127 if (power_well->always_on)
128 continue;
129
130 if (!power_well->hw_enabled) {
131 is_enabled = false;
132 break;
133 }
134 }
135
136 return is_enabled;
137 }
138
139 /**
140 * intel_display_power_is_enabled - check for a power domain
141 * @dev_priv: i915 device instance
142 * @domain: power domain to check
143 *
144 * This function can be used to check the hw power domain state. It is mostly
145 * used in hardware state readout functions. Everywhere else code should rely
146 * upon explicit power domain reference counting to ensure that the hardware
147 * block is powered up before accessing it.
148 *
149 * Callers must hold the relevant modesetting locks to ensure that concurrent
150 * threads can't disable the power well while the caller tries to read a few
151 * registers.
152 *
153 * Returns:
154 * True when the power domain is enabled, false otherwise.
155 */
156 bool intel_display_power_is_enabled(struct drm_i915_private *dev_priv,
157 enum intel_display_power_domain domain)
158 {
159 struct i915_power_domains *power_domains;
160 bool ret;
161
162 power_domains = &dev_priv->power_domains;
163
164 mutex_lock(&power_domains->lock);
165 ret = __intel_display_power_is_enabled(dev_priv, domain);
166 mutex_unlock(&power_domains->lock);
167
168 return ret;
169 }
170
171 /**
172 * intel_display_set_init_power - set the initial power domain state
173 * @dev_priv: i915 device instance
174 * @enable: whether to enable or disable the initial power domain state
175 *
176 * For simplicity our driver load/unload and system suspend/resume code assumes
177 * that all power domains are always enabled. This functions controls the state
178 * of this little hack. While the initial power domain state is enabled runtime
179 * pm is effectively disabled.
180 */
181 void intel_display_set_init_power(struct drm_i915_private *dev_priv,
182 bool enable)
183 {
184 if (dev_priv->power_domains.init_power_on == enable)
185 return;
186
187 if (enable)
188 intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);
189 else
190 intel_display_power_put(dev_priv, POWER_DOMAIN_INIT);
191
192 dev_priv->power_domains.init_power_on = enable;
193 }
194
195 /*
196 * Starting with Haswell, we have a "Power Down Well" that can be turned off
197 * when not needed anymore. We have 4 registers that can request the power well
198 * to be enabled, and it will only be disabled if none of the registers is
199 * requesting it to be enabled.
200 */
201 static void hsw_power_well_post_enable(struct drm_i915_private *dev_priv)
202 {
203 struct drm_device *dev = dev_priv->dev;
204
205 /*
206 * After we re-enable the power well, if we touch VGA register 0x3d5
207 * we'll get unclaimed register interrupts. This stops after we write
208 * anything to the VGA MSR register. The vgacon module uses this
209 * register all the time, so if we unbind our driver and, as a
210 * consequence, bind vgacon, we'll get stuck in an infinite loop at
211 * console_unlock(). So make here we touch the VGA MSR register, making
212 * sure vgacon can keep working normally without triggering interrupts
213 * and error messages.
214 */
215 vga_get_uninterruptible(dev->pdev, VGA_RSRC_LEGACY_IO);
216 outb(inb(VGA_MSR_READ), VGA_MSR_WRITE);
217 vga_put(dev->pdev, VGA_RSRC_LEGACY_IO);
218
219 if (IS_BROADWELL(dev))
220 gen8_irq_power_well_post_enable(dev_priv,
221 1 << PIPE_C | 1 << PIPE_B);
222 }
223
224 static void skl_power_well_post_enable(struct drm_i915_private *dev_priv,
225 struct i915_power_well *power_well)
226 {
227 struct drm_device *dev = dev_priv->dev;
228
229 /*
230 * After we re-enable the power well, if we touch VGA register 0x3d5
231 * we'll get unclaimed register interrupts. This stops after we write
232 * anything to the VGA MSR register. The vgacon module uses this
233 * register all the time, so if we unbind our driver and, as a
234 * consequence, bind vgacon, we'll get stuck in an infinite loop at
235 * console_unlock(). So make here we touch the VGA MSR register, making
236 * sure vgacon can keep working normally without triggering interrupts
237 * and error messages.
238 */
239 if (power_well->data == SKL_DISP_PW_2) {
240 vga_get_uninterruptible(dev->pdev, VGA_RSRC_LEGACY_IO);
241 outb(inb(VGA_MSR_READ), VGA_MSR_WRITE);
242 vga_put(dev->pdev, VGA_RSRC_LEGACY_IO);
243
244 gen8_irq_power_well_post_enable(dev_priv,
245 1 << PIPE_C | 1 << PIPE_B);
246 }
247
248 if (power_well->data == SKL_DISP_PW_1) {
249 intel_prepare_ddi(dev);
250 gen8_irq_power_well_post_enable(dev_priv, 1 << PIPE_A);
251 }
252 }
253
254 static void hsw_set_power_well(struct drm_i915_private *dev_priv,
255 struct i915_power_well *power_well, bool enable)
256 {
257 bool is_enabled, enable_requested;
258 uint32_t tmp;
259
260 tmp = I915_READ(HSW_PWR_WELL_DRIVER);
261 is_enabled = tmp & HSW_PWR_WELL_STATE_ENABLED;
262 enable_requested = tmp & HSW_PWR_WELL_ENABLE_REQUEST;
263
264 if (enable) {
265 if (!enable_requested)
266 I915_WRITE(HSW_PWR_WELL_DRIVER,
267 HSW_PWR_WELL_ENABLE_REQUEST);
268
269 if (!is_enabled) {
270 DRM_DEBUG_KMS("Enabling power well\n");
271 if (wait_for((I915_READ(HSW_PWR_WELL_DRIVER) &
272 HSW_PWR_WELL_STATE_ENABLED), 20))
273 DRM_ERROR("Timeout enabling power well\n");
274 hsw_power_well_post_enable(dev_priv);
275 }
276
277 } else {
278 if (enable_requested) {
279 I915_WRITE(HSW_PWR_WELL_DRIVER, 0);
280 POSTING_READ(HSW_PWR_WELL_DRIVER);
281 DRM_DEBUG_KMS("Requesting to disable the power well\n");
282 }
283 }
284 }
285
286 #define SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS ( \
287 BIT(POWER_DOMAIN_TRANSCODER_A) | \
288 BIT(POWER_DOMAIN_PIPE_B) | \
289 BIT(POWER_DOMAIN_TRANSCODER_B) | \
290 BIT(POWER_DOMAIN_PIPE_C) | \
291 BIT(POWER_DOMAIN_TRANSCODER_C) | \
292 BIT(POWER_DOMAIN_PIPE_B_PANEL_FITTER) | \
293 BIT(POWER_DOMAIN_PIPE_C_PANEL_FITTER) | \
294 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \
295 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \
296 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \
297 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \
298 BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) | \
299 BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) | \
300 BIT(POWER_DOMAIN_PORT_DDI_E_2_LANES) | \
301 BIT(POWER_DOMAIN_AUX_B) | \
302 BIT(POWER_DOMAIN_AUX_C) | \
303 BIT(POWER_DOMAIN_AUX_D) | \
304 BIT(POWER_DOMAIN_AUDIO) | \
305 BIT(POWER_DOMAIN_VGA) | \
306 BIT(POWER_DOMAIN_INIT))
307 #define SKL_DISPLAY_POWERWELL_1_POWER_DOMAINS ( \
308 SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS | \
309 BIT(POWER_DOMAIN_PLLS) | \
310 BIT(POWER_DOMAIN_PIPE_A) | \
311 BIT(POWER_DOMAIN_TRANSCODER_EDP) | \
312 BIT(POWER_DOMAIN_PIPE_A_PANEL_FITTER) | \
313 BIT(POWER_DOMAIN_PORT_DDI_A_2_LANES) | \
314 BIT(POWER_DOMAIN_PORT_DDI_A_4_LANES) | \
315 BIT(POWER_DOMAIN_AUX_A) | \
316 BIT(POWER_DOMAIN_INIT))
317 #define SKL_DISPLAY_DDI_A_E_POWER_DOMAINS ( \
318 BIT(POWER_DOMAIN_PORT_DDI_A_2_LANES) | \
319 BIT(POWER_DOMAIN_PORT_DDI_A_4_LANES) | \
320 BIT(POWER_DOMAIN_PORT_DDI_E_2_LANES) | \
321 BIT(POWER_DOMAIN_INIT))
322 #define SKL_DISPLAY_DDI_B_POWER_DOMAINS ( \
323 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \
324 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \
325 BIT(POWER_DOMAIN_INIT))
326 #define SKL_DISPLAY_DDI_C_POWER_DOMAINS ( \
327 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \
328 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \
329 BIT(POWER_DOMAIN_INIT))
330 #define SKL_DISPLAY_DDI_D_POWER_DOMAINS ( \
331 BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) | \
332 BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) | \
333 BIT(POWER_DOMAIN_INIT))
334 #define SKL_DISPLAY_MISC_IO_POWER_DOMAINS ( \
335 SKL_DISPLAY_POWERWELL_1_POWER_DOMAINS | \
336 BIT(POWER_DOMAIN_PLLS) | \
337 BIT(POWER_DOMAIN_INIT))
338 #define SKL_DISPLAY_ALWAYS_ON_POWER_DOMAINS ( \
339 (POWER_DOMAIN_MASK & ~(SKL_DISPLAY_POWERWELL_1_POWER_DOMAINS | \
340 SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS | \
341 SKL_DISPLAY_DDI_A_E_POWER_DOMAINS | \
342 SKL_DISPLAY_DDI_B_POWER_DOMAINS | \
343 SKL_DISPLAY_DDI_C_POWER_DOMAINS | \
344 SKL_DISPLAY_DDI_D_POWER_DOMAINS | \
345 SKL_DISPLAY_MISC_IO_POWER_DOMAINS)) | \
346 BIT(POWER_DOMAIN_INIT))
347
348 #define BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS ( \
349 BIT(POWER_DOMAIN_TRANSCODER_A) | \
350 BIT(POWER_DOMAIN_PIPE_B) | \
351 BIT(POWER_DOMAIN_TRANSCODER_B) | \
352 BIT(POWER_DOMAIN_PIPE_C) | \
353 BIT(POWER_DOMAIN_TRANSCODER_C) | \
354 BIT(POWER_DOMAIN_PIPE_B_PANEL_FITTER) | \
355 BIT(POWER_DOMAIN_PIPE_C_PANEL_FITTER) | \
356 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \
357 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \
358 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \
359 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \
360 BIT(POWER_DOMAIN_AUX_B) | \
361 BIT(POWER_DOMAIN_AUX_C) | \
362 BIT(POWER_DOMAIN_AUDIO) | \
363 BIT(POWER_DOMAIN_VGA) | \
364 BIT(POWER_DOMAIN_INIT))
365 #define BXT_DISPLAY_POWERWELL_1_POWER_DOMAINS ( \
366 BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS | \
367 BIT(POWER_DOMAIN_PIPE_A) | \
368 BIT(POWER_DOMAIN_TRANSCODER_EDP) | \
369 BIT(POWER_DOMAIN_PIPE_A_PANEL_FITTER) | \
370 BIT(POWER_DOMAIN_PORT_DDI_A_2_LANES) | \
371 BIT(POWER_DOMAIN_PORT_DDI_A_4_LANES) | \
372 BIT(POWER_DOMAIN_AUX_A) | \
373 BIT(POWER_DOMAIN_PLLS) | \
374 BIT(POWER_DOMAIN_INIT))
375 #define BXT_DISPLAY_ALWAYS_ON_POWER_DOMAINS ( \
376 (POWER_DOMAIN_MASK & ~(BXT_DISPLAY_POWERWELL_1_POWER_DOMAINS | \
377 BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS)) | \
378 BIT(POWER_DOMAIN_INIT))
379
380 static void assert_can_enable_dc9(struct drm_i915_private *dev_priv)
381 {
382 struct drm_device *dev = dev_priv->dev;
383
384 WARN(!IS_BROXTON(dev), "Platform doesn't support DC9.\n");
385 WARN((I915_READ(DC_STATE_EN) & DC_STATE_EN_DC9),
386 "DC9 already programmed to be enabled.\n");
387 WARN(I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5,
388 "DC5 still not disabled to enable DC9.\n");
389 WARN(I915_READ(HSW_PWR_WELL_DRIVER), "Power well on.\n");
390 WARN(intel_irqs_enabled(dev_priv), "Interrupts not disabled yet.\n");
391
392 /*
393 * TODO: check for the following to verify the conditions to enter DC9
394 * state are satisfied:
395 * 1] Check relevant display engine registers to verify if mode set
396 * disable sequence was followed.
397 * 2] Check if display uninitialize sequence is initialized.
398 */
399 }
400
401 static void assert_can_disable_dc9(struct drm_i915_private *dev_priv)
402 {
403 WARN(intel_irqs_enabled(dev_priv), "Interrupts not disabled yet.\n");
404 WARN(!(I915_READ(DC_STATE_EN) & DC_STATE_EN_DC9),
405 "DC9 already programmed to be disabled.\n");
406 WARN(I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5,
407 "DC5 still not disabled.\n");
408
409 /*
410 * TODO: check for the following to verify DC9 state was indeed
411 * entered before programming to disable it:
412 * 1] Check relevant display engine registers to verify if mode
413 * set disable sequence was followed.
414 * 2] Check if display uninitialize sequence is initialized.
415 */
416 }
417
418 void bxt_enable_dc9(struct drm_i915_private *dev_priv)
419 {
420 uint32_t val;
421
422 assert_can_enable_dc9(dev_priv);
423
424 DRM_DEBUG_KMS("Enabling DC9\n");
425
426 val = I915_READ(DC_STATE_EN);
427 val |= DC_STATE_EN_DC9;
428 I915_WRITE(DC_STATE_EN, val);
429 POSTING_READ(DC_STATE_EN);
430 }
431
432 void bxt_disable_dc9(struct drm_i915_private *dev_priv)
433 {
434 uint32_t val;
435
436 assert_can_disable_dc9(dev_priv);
437
438 DRM_DEBUG_KMS("Disabling DC9\n");
439
440 val = I915_READ(DC_STATE_EN);
441 val &= ~DC_STATE_EN_DC9;
442 I915_WRITE(DC_STATE_EN, val);
443 POSTING_READ(DC_STATE_EN);
444 }
445
446 static void gen9_set_dc_state_debugmask_memory_up(
447 struct drm_i915_private *dev_priv)
448 {
449 uint32_t val;
450
451 /* The below bit doesn't need to be cleared ever afterwards */
452 val = I915_READ(DC_STATE_DEBUG);
453 if (!(val & DC_STATE_DEBUG_MASK_MEMORY_UP)) {
454 val |= DC_STATE_DEBUG_MASK_MEMORY_UP;
455 I915_WRITE(DC_STATE_DEBUG, val);
456 POSTING_READ(DC_STATE_DEBUG);
457 }
458 }
459
460 static void assert_can_enable_dc5(struct drm_i915_private *dev_priv)
461 {
462 struct drm_device *dev = dev_priv->dev;
463 bool pg2_enabled = intel_display_power_well_is_enabled(dev_priv,
464 SKL_DISP_PW_2);
465
466 WARN_ONCE(!IS_SKYLAKE(dev), "Platform doesn't support DC5.\n");
467 WARN_ONCE(!HAS_RUNTIME_PM(dev), "Runtime PM not enabled.\n");
468 WARN_ONCE(pg2_enabled, "PG2 not disabled to enable DC5.\n");
469
470 WARN_ONCE((I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5),
471 "DC5 already programmed to be enabled.\n");
472 WARN_ONCE(dev_priv->pm.suspended,
473 "DC5 cannot be enabled, if platform is runtime-suspended.\n");
474
475 assert_csr_loaded(dev_priv);
476 }
477
478 static void assert_can_disable_dc5(struct drm_i915_private *dev_priv)
479 {
480 bool pg2_enabled = intel_display_power_well_is_enabled(dev_priv,
481 SKL_DISP_PW_2);
482 /*
483 * During initialization, the firmware may not be loaded yet.
484 * We still want to make sure that the DC enabling flag is cleared.
485 */
486 if (dev_priv->power_domains.initializing)
487 return;
488
489 WARN_ONCE(!pg2_enabled, "PG2 not enabled to disable DC5.\n");
490 WARN_ONCE(dev_priv->pm.suspended,
491 "Disabling of DC5 while platform is runtime-suspended should never happen.\n");
492 }
493
494 static void gen9_enable_dc5(struct drm_i915_private *dev_priv)
495 {
496 uint32_t val;
497
498 assert_can_enable_dc5(dev_priv);
499
500 DRM_DEBUG_KMS("Enabling DC5\n");
501
502 gen9_set_dc_state_debugmask_memory_up(dev_priv);
503
504 val = I915_READ(DC_STATE_EN);
505 val &= ~DC_STATE_EN_UPTO_DC5_DC6_MASK;
506 val |= DC_STATE_EN_UPTO_DC5;
507 I915_WRITE(DC_STATE_EN, val);
508 POSTING_READ(DC_STATE_EN);
509 }
510
511 static void gen9_disable_dc5(struct drm_i915_private *dev_priv)
512 {
513 uint32_t val;
514
515 assert_can_disable_dc5(dev_priv);
516
517 DRM_DEBUG_KMS("Disabling DC5\n");
518
519 val = I915_READ(DC_STATE_EN);
520 val &= ~DC_STATE_EN_UPTO_DC5;
521 I915_WRITE(DC_STATE_EN, val);
522 POSTING_READ(DC_STATE_EN);
523 }
524
525 static void assert_can_enable_dc6(struct drm_i915_private *dev_priv)
526 {
527 struct drm_device *dev = dev_priv->dev;
528
529 WARN_ONCE(!IS_SKYLAKE(dev), "Platform doesn't support DC6.\n");
530 WARN_ONCE(!HAS_RUNTIME_PM(dev), "Runtime PM not enabled.\n");
531 WARN_ONCE(I915_READ(UTIL_PIN_CTL) & UTIL_PIN_ENABLE,
532 "Backlight is not disabled.\n");
533 WARN_ONCE((I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC6),
534 "DC6 already programmed to be enabled.\n");
535
536 assert_csr_loaded(dev_priv);
537 }
538
539 static void assert_can_disable_dc6(struct drm_i915_private *dev_priv)
540 {
541 /*
542 * During initialization, the firmware may not be loaded yet.
543 * We still want to make sure that the DC enabling flag is cleared.
544 */
545 if (dev_priv->power_domains.initializing)
546 return;
547
548 assert_csr_loaded(dev_priv);
549 WARN_ONCE(!(I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC6),
550 "DC6 already programmed to be disabled.\n");
551 }
552
553 static void skl_enable_dc6(struct drm_i915_private *dev_priv)
554 {
555 uint32_t val;
556
557 assert_can_enable_dc6(dev_priv);
558
559 DRM_DEBUG_KMS("Enabling DC6\n");
560
561 gen9_set_dc_state_debugmask_memory_up(dev_priv);
562
563 val = I915_READ(DC_STATE_EN);
564 val &= ~DC_STATE_EN_UPTO_DC5_DC6_MASK;
565 val |= DC_STATE_EN_UPTO_DC6;
566 I915_WRITE(DC_STATE_EN, val);
567 POSTING_READ(DC_STATE_EN);
568 }
569
570 static void skl_disable_dc6(struct drm_i915_private *dev_priv)
571 {
572 uint32_t val;
573
574 assert_can_disable_dc6(dev_priv);
575
576 DRM_DEBUG_KMS("Disabling DC6\n");
577
578 val = I915_READ(DC_STATE_EN);
579 val &= ~DC_STATE_EN_UPTO_DC6;
580 I915_WRITE(DC_STATE_EN, val);
581 POSTING_READ(DC_STATE_EN);
582 }
583
584 static void skl_set_power_well(struct drm_i915_private *dev_priv,
585 struct i915_power_well *power_well, bool enable)
586 {
587 struct drm_device *dev = dev_priv->dev;
588 uint32_t tmp, fuse_status;
589 uint32_t req_mask, state_mask;
590 bool is_enabled, enable_requested, check_fuse_status = false;
591
592 tmp = I915_READ(HSW_PWR_WELL_DRIVER);
593 fuse_status = I915_READ(SKL_FUSE_STATUS);
594
595 switch (power_well->data) {
596 case SKL_DISP_PW_1:
597 if (wait_for((I915_READ(SKL_FUSE_STATUS) &
598 SKL_FUSE_PG0_DIST_STATUS), 1)) {
599 DRM_ERROR("PG0 not enabled\n");
600 return;
601 }
602 break;
603 case SKL_DISP_PW_2:
604 if (!(fuse_status & SKL_FUSE_PG1_DIST_STATUS)) {
605 DRM_ERROR("PG1 in disabled state\n");
606 return;
607 }
608 break;
609 case SKL_DISP_PW_DDI_A_E:
610 case SKL_DISP_PW_DDI_B:
611 case SKL_DISP_PW_DDI_C:
612 case SKL_DISP_PW_DDI_D:
613 case SKL_DISP_PW_MISC_IO:
614 break;
615 default:
616 WARN(1, "Unknown power well %lu\n", power_well->data);
617 return;
618 }
619
620 req_mask = SKL_POWER_WELL_REQ(power_well->data);
621 enable_requested = tmp & req_mask;
622 state_mask = SKL_POWER_WELL_STATE(power_well->data);
623 is_enabled = tmp & state_mask;
624
625 if (enable) {
626 if (!enable_requested) {
627 WARN((tmp & state_mask) &&
628 !I915_READ(HSW_PWR_WELL_BIOS),
629 "Invalid for power well status to be enabled, unless done by the BIOS, \
630 when request is to disable!\n");
631 if ((GEN9_ENABLE_DC5(dev) || SKL_ENABLE_DC6(dev)) &&
632 power_well->data == SKL_DISP_PW_2) {
633 if (SKL_ENABLE_DC6(dev)) {
634 skl_disable_dc6(dev_priv);
635 /*
636 * DDI buffer programming unnecessary during driver-load/resume
637 * as it's already done during modeset initialization then.
638 * It's also invalid here as encoder list is still uninitialized.
639 */
640 if (!dev_priv->power_domains.initializing)
641 intel_prepare_ddi(dev);
642 } else {
643 gen9_disable_dc5(dev_priv);
644 }
645 }
646 I915_WRITE(HSW_PWR_WELL_DRIVER, tmp | req_mask);
647 }
648
649 if (!is_enabled) {
650 DRM_DEBUG_KMS("Enabling %s\n", power_well->name);
651 if (wait_for((I915_READ(HSW_PWR_WELL_DRIVER) &
652 state_mask), 1))
653 DRM_ERROR("%s enable timeout\n",
654 power_well->name);
655 check_fuse_status = true;
656 }
657 } else {
658 if (enable_requested) {
659 if (IS_SKYLAKE(dev) &&
660 (power_well->data == SKL_DISP_PW_1) &&
661 (intel_csr_load_status_get(dev_priv) == FW_LOADED))
662 DRM_DEBUG_KMS("Not Disabling PW1, dmc will handle\n");
663 else {
664 I915_WRITE(HSW_PWR_WELL_DRIVER, tmp & ~req_mask);
665 POSTING_READ(HSW_PWR_WELL_DRIVER);
666 DRM_DEBUG_KMS("Disabling %s\n", power_well->name);
667 }
668
669 if ((GEN9_ENABLE_DC5(dev) || SKL_ENABLE_DC6(dev)) &&
670 power_well->data == SKL_DISP_PW_2) {
671 enum csr_state state;
672 /* TODO: wait for a completion event or
673 * similar here instead of busy
674 * waiting using wait_for function.
675 */
676 wait_for((state = intel_csr_load_status_get(dev_priv)) !=
677 FW_UNINITIALIZED, 1000);
678 if (state != FW_LOADED)
679 DRM_DEBUG("CSR firmware not ready (%d)\n",
680 state);
681 else
682 if (SKL_ENABLE_DC6(dev))
683 skl_enable_dc6(dev_priv);
684 else
685 gen9_enable_dc5(dev_priv);
686 }
687 }
688 }
689
690 if (check_fuse_status) {
691 if (power_well->data == SKL_DISP_PW_1) {
692 if (wait_for((I915_READ(SKL_FUSE_STATUS) &
693 SKL_FUSE_PG1_DIST_STATUS), 1))
694 DRM_ERROR("PG1 distributing status timeout\n");
695 } else if (power_well->data == SKL_DISP_PW_2) {
696 if (wait_for((I915_READ(SKL_FUSE_STATUS) &
697 SKL_FUSE_PG2_DIST_STATUS), 1))
698 DRM_ERROR("PG2 distributing status timeout\n");
699 }
700 }
701
702 if (enable && !is_enabled)
703 skl_power_well_post_enable(dev_priv, power_well);
704 }
705
706 static void hsw_power_well_sync_hw(struct drm_i915_private *dev_priv,
707 struct i915_power_well *power_well)
708 {
709 hsw_set_power_well(dev_priv, power_well, power_well->count > 0);
710
711 /*
712 * We're taking over the BIOS, so clear any requests made by it since
713 * the driver is in charge now.
714 */
715 if (I915_READ(HSW_PWR_WELL_BIOS) & HSW_PWR_WELL_ENABLE_REQUEST)
716 I915_WRITE(HSW_PWR_WELL_BIOS, 0);
717 }
718
719 static void hsw_power_well_enable(struct drm_i915_private *dev_priv,
720 struct i915_power_well *power_well)
721 {
722 hsw_set_power_well(dev_priv, power_well, true);
723 }
724
725 static void hsw_power_well_disable(struct drm_i915_private *dev_priv,
726 struct i915_power_well *power_well)
727 {
728 hsw_set_power_well(dev_priv, power_well, false);
729 }
730
731 static bool skl_power_well_enabled(struct drm_i915_private *dev_priv,
732 struct i915_power_well *power_well)
733 {
734 uint32_t mask = SKL_POWER_WELL_REQ(power_well->data) |
735 SKL_POWER_WELL_STATE(power_well->data);
736
737 return (I915_READ(HSW_PWR_WELL_DRIVER) & mask) == mask;
738 }
739
740 static void skl_power_well_sync_hw(struct drm_i915_private *dev_priv,
741 struct i915_power_well *power_well)
742 {
743 skl_set_power_well(dev_priv, power_well, power_well->count > 0);
744
745 /* Clear any request made by BIOS as driver is taking over */
746 I915_WRITE(HSW_PWR_WELL_BIOS, 0);
747 }
748
749 static void skl_power_well_enable(struct drm_i915_private *dev_priv,
750 struct i915_power_well *power_well)
751 {
752 skl_set_power_well(dev_priv, power_well, true);
753 }
754
755 static void skl_power_well_disable(struct drm_i915_private *dev_priv,
756 struct i915_power_well *power_well)
757 {
758 skl_set_power_well(dev_priv, power_well, false);
759 }
760
761 static void i9xx_always_on_power_well_noop(struct drm_i915_private *dev_priv,
762 struct i915_power_well *power_well)
763 {
764 }
765
766 static bool i9xx_always_on_power_well_enabled(struct drm_i915_private *dev_priv,
767 struct i915_power_well *power_well)
768 {
769 return true;
770 }
771
772 static void vlv_set_power_well(struct drm_i915_private *dev_priv,
773 struct i915_power_well *power_well, bool enable)
774 {
775 enum punit_power_well power_well_id = power_well->data;
776 u32 mask;
777 u32 state;
778 u32 ctrl;
779
780 mask = PUNIT_PWRGT_MASK(power_well_id);
781 state = enable ? PUNIT_PWRGT_PWR_ON(power_well_id) :
782 PUNIT_PWRGT_PWR_GATE(power_well_id);
783
784 mutex_lock(&dev_priv->rps.hw_lock);
785
786 #define COND \
787 ((vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_STATUS) & mask) == state)
788
789 if (COND)
790 goto out;
791
792 ctrl = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_CTRL);
793 ctrl &= ~mask;
794 ctrl |= state;
795 vlv_punit_write(dev_priv, PUNIT_REG_PWRGT_CTRL, ctrl);
796
797 if (wait_for(COND, 100))
798 DRM_ERROR("timeout setting power well state %08x (%08x)\n",
799 state,
800 vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_CTRL));
801
802 #undef COND
803
804 out:
805 mutex_unlock(&dev_priv->rps.hw_lock);
806 }
807
808 static void vlv_power_well_sync_hw(struct drm_i915_private *dev_priv,
809 struct i915_power_well *power_well)
810 {
811 vlv_set_power_well(dev_priv, power_well, power_well->count > 0);
812 }
813
814 static void vlv_power_well_enable(struct drm_i915_private *dev_priv,
815 struct i915_power_well *power_well)
816 {
817 vlv_set_power_well(dev_priv, power_well, true);
818 }
819
820 static void vlv_power_well_disable(struct drm_i915_private *dev_priv,
821 struct i915_power_well *power_well)
822 {
823 vlv_set_power_well(dev_priv, power_well, false);
824 }
825
826 static bool vlv_power_well_enabled(struct drm_i915_private *dev_priv,
827 struct i915_power_well *power_well)
828 {
829 int power_well_id = power_well->data;
830 bool enabled = false;
831 u32 mask;
832 u32 state;
833 u32 ctrl;
834
835 mask = PUNIT_PWRGT_MASK(power_well_id);
836 ctrl = PUNIT_PWRGT_PWR_ON(power_well_id);
837
838 mutex_lock(&dev_priv->rps.hw_lock);
839
840 state = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_STATUS) & mask;
841 /*
842 * We only ever set the power-on and power-gate states, anything
843 * else is unexpected.
844 */
845 WARN_ON(state != PUNIT_PWRGT_PWR_ON(power_well_id) &&
846 state != PUNIT_PWRGT_PWR_GATE(power_well_id));
847 if (state == ctrl)
848 enabled = true;
849
850 /*
851 * A transient state at this point would mean some unexpected party
852 * is poking at the power controls too.
853 */
854 ctrl = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_CTRL) & mask;
855 WARN_ON(ctrl != state);
856
857 mutex_unlock(&dev_priv->rps.hw_lock);
858
859 return enabled;
860 }
861
862 static void vlv_display_power_well_init(struct drm_i915_private *dev_priv)
863 {
864 enum pipe pipe;
865
866 /*
867 * Enable the CRI clock source so we can get at the
868 * display and the reference clock for VGA
869 * hotplug / manual detection. Supposedly DSI also
870 * needs the ref clock up and running.
871 *
872 * CHV DPLL B/C have some issues if VGA mode is enabled.
873 */
874 for_each_pipe(dev_priv->dev, pipe) {
875 u32 val = I915_READ(DPLL(pipe));
876
877 val |= DPLL_REF_CLK_ENABLE_VLV | DPLL_VGA_MODE_DIS;
878 if (pipe != PIPE_A)
879 val |= DPLL_INTEGRATED_CRI_CLK_VLV;
880
881 I915_WRITE(DPLL(pipe), val);
882 }
883
884 spin_lock_irq(&dev_priv->irq_lock);
885 valleyview_enable_display_irqs(dev_priv);
886 spin_unlock_irq(&dev_priv->irq_lock);
887
888 /*
889 * During driver initialization/resume we can avoid restoring the
890 * part of the HW/SW state that will be inited anyway explicitly.
891 */
892 if (dev_priv->power_domains.initializing)
893 return;
894
895 intel_hpd_init(dev_priv);
896
897 i915_redisable_vga_power_on(dev_priv->dev);
898 }
899
900 static void vlv_display_power_well_deinit(struct drm_i915_private *dev_priv)
901 {
902 spin_lock_irq(&dev_priv->irq_lock);
903 valleyview_disable_display_irqs(dev_priv);
904 spin_unlock_irq(&dev_priv->irq_lock);
905
906 vlv_power_sequencer_reset(dev_priv);
907 }
908
909 static void vlv_display_power_well_enable(struct drm_i915_private *dev_priv,
910 struct i915_power_well *power_well)
911 {
912 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DISP2D);
913
914 vlv_set_power_well(dev_priv, power_well, true);
915
916 vlv_display_power_well_init(dev_priv);
917 }
918
919 static void vlv_display_power_well_disable(struct drm_i915_private *dev_priv,
920 struct i915_power_well *power_well)
921 {
922 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DISP2D);
923
924 vlv_display_power_well_deinit(dev_priv);
925
926 vlv_set_power_well(dev_priv, power_well, false);
927 }
928
929 static void vlv_dpio_cmn_power_well_enable(struct drm_i915_private *dev_priv,
930 struct i915_power_well *power_well)
931 {
932 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC);
933
934 /* since ref/cri clock was enabled */
935 udelay(1); /* >10ns for cmnreset, >0ns for sidereset */
936
937 vlv_set_power_well(dev_priv, power_well, true);
938
939 /*
940 * From VLV2A0_DP_eDP_DPIO_driver_vbios_notes_10.docx -
941 * 6. De-assert cmn_reset/side_reset. Same as VLV X0.
942 * a. GUnit 0x2110 bit[0] set to 1 (def 0)
943 * b. The other bits such as sfr settings / modesel may all
944 * be set to 0.
945 *
946 * This should only be done on init and resume from S3 with
947 * both PLLs disabled, or we risk losing DPIO and PLL
948 * synchronization.
949 */
950 I915_WRITE(DPIO_CTL, I915_READ(DPIO_CTL) | DPIO_CMNRST);
951 }
952
953 static void vlv_dpio_cmn_power_well_disable(struct drm_i915_private *dev_priv,
954 struct i915_power_well *power_well)
955 {
956 enum pipe pipe;
957
958 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC);
959
960 for_each_pipe(dev_priv, pipe)
961 assert_pll_disabled(dev_priv, pipe);
962
963 /* Assert common reset */
964 I915_WRITE(DPIO_CTL, I915_READ(DPIO_CTL) & ~DPIO_CMNRST);
965
966 vlv_set_power_well(dev_priv, power_well, false);
967 }
968
969 #define POWER_DOMAIN_MASK (BIT(POWER_DOMAIN_NUM) - 1)
970
971 static struct i915_power_well *lookup_power_well(struct drm_i915_private *dev_priv,
972 int power_well_id)
973 {
974 struct i915_power_domains *power_domains = &dev_priv->power_domains;
975 struct i915_power_well *power_well;
976 int i;
977
978 for_each_power_well(i, power_well, POWER_DOMAIN_MASK, power_domains) {
979 if (power_well->data == power_well_id)
980 return power_well;
981 }
982
983 return NULL;
984 }
985
986 #define BITS_SET(val, bits) (((val) & (bits)) == (bits))
987
988 static void assert_chv_phy_status(struct drm_i915_private *dev_priv)
989 {
990 struct i915_power_well *cmn_bc =
991 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_BC);
992 struct i915_power_well *cmn_d =
993 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_D);
994 u32 phy_control = dev_priv->chv_phy_control;
995 u32 phy_status = 0;
996 u32 phy_status_mask = 0xffffffff;
997 u32 tmp;
998
999 /*
1000 * The BIOS can leave the PHY is some weird state
1001 * where it doesn't fully power down some parts.
1002 * Disable the asserts until the PHY has been fully
1003 * reset (ie. the power well has been disabled at
1004 * least once).
1005 */
1006 if (!dev_priv->chv_phy_assert[DPIO_PHY0])
1007 phy_status_mask &= ~(PHY_STATUS_CMN_LDO(DPIO_PHY0, DPIO_CH0) |
1008 PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH0, 0) |
1009 PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH0, 1) |
1010 PHY_STATUS_CMN_LDO(DPIO_PHY0, DPIO_CH1) |
1011 PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH1, 0) |
1012 PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH1, 1));
1013
1014 if (!dev_priv->chv_phy_assert[DPIO_PHY1])
1015 phy_status_mask &= ~(PHY_STATUS_CMN_LDO(DPIO_PHY1, DPIO_CH0) |
1016 PHY_STATUS_SPLINE_LDO(DPIO_PHY1, DPIO_CH0, 0) |
1017 PHY_STATUS_SPLINE_LDO(DPIO_PHY1, DPIO_CH0, 1));
1018
1019 if (cmn_bc->ops->is_enabled(dev_priv, cmn_bc)) {
1020 phy_status |= PHY_POWERGOOD(DPIO_PHY0);
1021
1022 /* this assumes override is only used to enable lanes */
1023 if ((phy_control & PHY_CH_POWER_DOWN_OVRD_EN(DPIO_PHY0, DPIO_CH0)) == 0)
1024 phy_control |= PHY_CH_POWER_DOWN_OVRD(0xf, DPIO_PHY0, DPIO_CH0);
1025
1026 if ((phy_control & PHY_CH_POWER_DOWN_OVRD_EN(DPIO_PHY0, DPIO_CH1)) == 0)
1027 phy_control |= PHY_CH_POWER_DOWN_OVRD(0xf, DPIO_PHY0, DPIO_CH1);
1028
1029 /* CL1 is on whenever anything is on in either channel */
1030 if (BITS_SET(phy_control,
1031 PHY_CH_POWER_DOWN_OVRD(0xf, DPIO_PHY0, DPIO_CH0) |
1032 PHY_CH_POWER_DOWN_OVRD(0xf, DPIO_PHY0, DPIO_CH1)))
1033 phy_status |= PHY_STATUS_CMN_LDO(DPIO_PHY0, DPIO_CH0);
1034
1035 /*
1036 * The DPLLB check accounts for the pipe B + port A usage
1037 * with CL2 powered up but all the lanes in the second channel
1038 * powered down.
1039 */
1040 if (BITS_SET(phy_control,
1041 PHY_CH_POWER_DOWN_OVRD(0xf, DPIO_PHY0, DPIO_CH1)) &&
1042 (I915_READ(DPLL(PIPE_B)) & DPLL_VCO_ENABLE) == 0)
1043 phy_status |= PHY_STATUS_CMN_LDO(DPIO_PHY0, DPIO_CH1);
1044
1045 if (BITS_SET(phy_control,
1046 PHY_CH_POWER_DOWN_OVRD(0x3, DPIO_PHY0, DPIO_CH0)))
1047 phy_status |= PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH0, 0);
1048 if (BITS_SET(phy_control,
1049 PHY_CH_POWER_DOWN_OVRD(0xc, DPIO_PHY0, DPIO_CH0)))
1050 phy_status |= PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH0, 1);
1051
1052 if (BITS_SET(phy_control,
1053 PHY_CH_POWER_DOWN_OVRD(0x3, DPIO_PHY0, DPIO_CH1)))
1054 phy_status |= PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH1, 0);
1055 if (BITS_SET(phy_control,
1056 PHY_CH_POWER_DOWN_OVRD(0xc, DPIO_PHY0, DPIO_CH1)))
1057 phy_status |= PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH1, 1);
1058 }
1059
1060 if (cmn_d->ops->is_enabled(dev_priv, cmn_d)) {
1061 phy_status |= PHY_POWERGOOD(DPIO_PHY1);
1062
1063 /* this assumes override is only used to enable lanes */
1064 if ((phy_control & PHY_CH_POWER_DOWN_OVRD_EN(DPIO_PHY1, DPIO_CH0)) == 0)
1065 phy_control |= PHY_CH_POWER_DOWN_OVRD(0xf, DPIO_PHY1, DPIO_CH0);
1066
1067 if (BITS_SET(phy_control,
1068 PHY_CH_POWER_DOWN_OVRD(0xf, DPIO_PHY1, DPIO_CH0)))
1069 phy_status |= PHY_STATUS_CMN_LDO(DPIO_PHY1, DPIO_CH0);
1070
1071 if (BITS_SET(phy_control,
1072 PHY_CH_POWER_DOWN_OVRD(0x3, DPIO_PHY1, DPIO_CH0)))
1073 phy_status |= PHY_STATUS_SPLINE_LDO(DPIO_PHY1, DPIO_CH0, 0);
1074 if (BITS_SET(phy_control,
1075 PHY_CH_POWER_DOWN_OVRD(0xc, DPIO_PHY1, DPIO_CH0)))
1076 phy_status |= PHY_STATUS_SPLINE_LDO(DPIO_PHY1, DPIO_CH0, 1);
1077 }
1078
1079 phy_status &= phy_status_mask;
1080
1081 /*
1082 * The PHY may be busy with some initial calibration and whatnot,
1083 * so the power state can take a while to actually change.
1084 */
1085 if (wait_for((tmp = I915_READ(DISPLAY_PHY_STATUS) & phy_status_mask) == phy_status, 10))
1086 WARN(phy_status != tmp,
1087 "Unexpected PHY_STATUS 0x%08x, expected 0x%08x (PHY_CONTROL=0x%08x)\n",
1088 tmp, phy_status, dev_priv->chv_phy_control);
1089 }
1090
1091 #undef BITS_SET
1092
1093 static void chv_dpio_cmn_power_well_enable(struct drm_i915_private *dev_priv,
1094 struct i915_power_well *power_well)
1095 {
1096 enum dpio_phy phy;
1097 enum pipe pipe;
1098 uint32_t tmp;
1099
1100 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC &&
1101 power_well->data != PUNIT_POWER_WELL_DPIO_CMN_D);
1102
1103 if (power_well->data == PUNIT_POWER_WELL_DPIO_CMN_BC) {
1104 pipe = PIPE_A;
1105 phy = DPIO_PHY0;
1106 } else {
1107 pipe = PIPE_C;
1108 phy = DPIO_PHY1;
1109 }
1110
1111 /* since ref/cri clock was enabled */
1112 udelay(1); /* >10ns for cmnreset, >0ns for sidereset */
1113 vlv_set_power_well(dev_priv, power_well, true);
1114
1115 /* Poll for phypwrgood signal */
1116 if (wait_for(I915_READ(DISPLAY_PHY_STATUS) & PHY_POWERGOOD(phy), 1))
1117 DRM_ERROR("Display PHY %d is not power up\n", phy);
1118
1119 mutex_lock(&dev_priv->sb_lock);
1120
1121 /* Enable dynamic power down */
1122 tmp = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW28);
1123 tmp |= DPIO_DYNPWRDOWNEN_CH0 | DPIO_CL1POWERDOWNEN |
1124 DPIO_SUS_CLK_CONFIG_GATE_CLKREQ;
1125 vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW28, tmp);
1126
1127 if (power_well->data == PUNIT_POWER_WELL_DPIO_CMN_BC) {
1128 tmp = vlv_dpio_read(dev_priv, pipe, _CHV_CMN_DW6_CH1);
1129 tmp |= DPIO_DYNPWRDOWNEN_CH1;
1130 vlv_dpio_write(dev_priv, pipe, _CHV_CMN_DW6_CH1, tmp);
1131 } else {
1132 /*
1133 * Force the non-existing CL2 off. BXT does this
1134 * too, so maybe it saves some power even though
1135 * CL2 doesn't exist?
1136 */
1137 tmp = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW30);
1138 tmp |= DPIO_CL2_LDOFUSE_PWRENB;
1139 vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW30, tmp);
1140 }
1141
1142 mutex_unlock(&dev_priv->sb_lock);
1143
1144 dev_priv->chv_phy_control |= PHY_COM_LANE_RESET_DEASSERT(phy);
1145 I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control);
1146
1147 DRM_DEBUG_KMS("Enabled DPIO PHY%d (PHY_CONTROL=0x%08x)\n",
1148 phy, dev_priv->chv_phy_control);
1149
1150 assert_chv_phy_status(dev_priv);
1151 }
1152
1153 static void chv_dpio_cmn_power_well_disable(struct drm_i915_private *dev_priv,
1154 struct i915_power_well *power_well)
1155 {
1156 enum dpio_phy phy;
1157
1158 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC &&
1159 power_well->data != PUNIT_POWER_WELL_DPIO_CMN_D);
1160
1161 if (power_well->data == PUNIT_POWER_WELL_DPIO_CMN_BC) {
1162 phy = DPIO_PHY0;
1163 assert_pll_disabled(dev_priv, PIPE_A);
1164 assert_pll_disabled(dev_priv, PIPE_B);
1165 } else {
1166 phy = DPIO_PHY1;
1167 assert_pll_disabled(dev_priv, PIPE_C);
1168 }
1169
1170 dev_priv->chv_phy_control &= ~PHY_COM_LANE_RESET_DEASSERT(phy);
1171 I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control);
1172
1173 vlv_set_power_well(dev_priv, power_well, false);
1174
1175 DRM_DEBUG_KMS("Disabled DPIO PHY%d (PHY_CONTROL=0x%08x)\n",
1176 phy, dev_priv->chv_phy_control);
1177
1178 /* PHY is fully reset now, so we can enable the PHY state asserts */
1179 dev_priv->chv_phy_assert[phy] = true;
1180
1181 assert_chv_phy_status(dev_priv);
1182 }
1183
1184 static void assert_chv_phy_powergate(struct drm_i915_private *dev_priv, enum dpio_phy phy,
1185 enum dpio_channel ch, bool override, unsigned int mask)
1186 {
1187 enum pipe pipe = phy == DPIO_PHY0 ? PIPE_A : PIPE_C;
1188 u32 reg, val, expected, actual;
1189
1190 /*
1191 * The BIOS can leave the PHY is some weird state
1192 * where it doesn't fully power down some parts.
1193 * Disable the asserts until the PHY has been fully
1194 * reset (ie. the power well has been disabled at
1195 * least once).
1196 */
1197 if (!dev_priv->chv_phy_assert[phy])
1198 return;
1199
1200 if (ch == DPIO_CH0)
1201 reg = _CHV_CMN_DW0_CH0;
1202 else
1203 reg = _CHV_CMN_DW6_CH1;
1204
1205 mutex_lock(&dev_priv->sb_lock);
1206 val = vlv_dpio_read(dev_priv, pipe, reg);
1207 mutex_unlock(&dev_priv->sb_lock);
1208
1209 /*
1210 * This assumes !override is only used when the port is disabled.
1211 * All lanes should power down even without the override when
1212 * the port is disabled.
1213 */
1214 if (!override || mask == 0xf) {
1215 expected = DPIO_ALLDL_POWERDOWN | DPIO_ANYDL_POWERDOWN;
1216 /*
1217 * If CH1 common lane is not active anymore
1218 * (eg. for pipe B DPLL) the entire channel will
1219 * shut down, which causes the common lane registers
1220 * to read as 0. That means we can't actually check
1221 * the lane power down status bits, but as the entire
1222 * register reads as 0 it's a good indication that the
1223 * channel is indeed entirely powered down.
1224 */
1225 if (ch == DPIO_CH1 && val == 0)
1226 expected = 0;
1227 } else if (mask != 0x0) {
1228 expected = DPIO_ANYDL_POWERDOWN;
1229 } else {
1230 expected = 0;
1231 }
1232
1233 if (ch == DPIO_CH0)
1234 actual = val >> DPIO_ANYDL_POWERDOWN_SHIFT_CH0;
1235 else
1236 actual = val >> DPIO_ANYDL_POWERDOWN_SHIFT_CH1;
1237 actual &= DPIO_ALLDL_POWERDOWN | DPIO_ANYDL_POWERDOWN;
1238
1239 WARN(actual != expected,
1240 "Unexpected DPIO lane power down: all %d, any %d. Expected: all %d, any %d. (0x%x = 0x%08x)\n",
1241 !!(actual & DPIO_ALLDL_POWERDOWN), !!(actual & DPIO_ANYDL_POWERDOWN),
1242 !!(expected & DPIO_ALLDL_POWERDOWN), !!(expected & DPIO_ANYDL_POWERDOWN),
1243 reg, val);
1244 }
1245
1246 bool chv_phy_powergate_ch(struct drm_i915_private *dev_priv, enum dpio_phy phy,
1247 enum dpio_channel ch, bool override)
1248 {
1249 struct i915_power_domains *power_domains = &dev_priv->power_domains;
1250 bool was_override;
1251
1252 mutex_lock(&power_domains->lock);
1253
1254 was_override = dev_priv->chv_phy_control & PHY_CH_POWER_DOWN_OVRD_EN(phy, ch);
1255
1256 if (override == was_override)
1257 goto out;
1258
1259 if (override)
1260 dev_priv->chv_phy_control |= PHY_CH_POWER_DOWN_OVRD_EN(phy, ch);
1261 else
1262 dev_priv->chv_phy_control &= ~PHY_CH_POWER_DOWN_OVRD_EN(phy, ch);
1263
1264 I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control);
1265
1266 DRM_DEBUG_KMS("Power gating DPIO PHY%d CH%d (DPIO_PHY_CONTROL=0x%08x)\n",
1267 phy, ch, dev_priv->chv_phy_control);
1268
1269 assert_chv_phy_status(dev_priv);
1270
1271 out:
1272 mutex_unlock(&power_domains->lock);
1273
1274 return was_override;
1275 }
1276
1277 void chv_phy_powergate_lanes(struct intel_encoder *encoder,
1278 bool override, unsigned int mask)
1279 {
1280 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
1281 struct i915_power_domains *power_domains = &dev_priv->power_domains;
1282 enum dpio_phy phy = vlv_dport_to_phy(enc_to_dig_port(&encoder->base));
1283 enum dpio_channel ch = vlv_dport_to_channel(enc_to_dig_port(&encoder->base));
1284
1285 mutex_lock(&power_domains->lock);
1286
1287 dev_priv->chv_phy_control &= ~PHY_CH_POWER_DOWN_OVRD(0xf, phy, ch);
1288 dev_priv->chv_phy_control |= PHY_CH_POWER_DOWN_OVRD(mask, phy, ch);
1289
1290 if (override)
1291 dev_priv->chv_phy_control |= PHY_CH_POWER_DOWN_OVRD_EN(phy, ch);
1292 else
1293 dev_priv->chv_phy_control &= ~PHY_CH_POWER_DOWN_OVRD_EN(phy, ch);
1294
1295 I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control);
1296
1297 DRM_DEBUG_KMS("Power gating DPIO PHY%d CH%d lanes 0x%x (PHY_CONTROL=0x%08x)\n",
1298 phy, ch, mask, dev_priv->chv_phy_control);
1299
1300 assert_chv_phy_status(dev_priv);
1301
1302 assert_chv_phy_powergate(dev_priv, phy, ch, override, mask);
1303
1304 mutex_unlock(&power_domains->lock);
1305 }
1306
1307 static bool chv_pipe_power_well_enabled(struct drm_i915_private *dev_priv,
1308 struct i915_power_well *power_well)
1309 {
1310 enum pipe pipe = power_well->data;
1311 bool enabled;
1312 u32 state, ctrl;
1313
1314 mutex_lock(&dev_priv->rps.hw_lock);
1315
1316 state = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) & DP_SSS_MASK(pipe);
1317 /*
1318 * We only ever set the power-on and power-gate states, anything
1319 * else is unexpected.
1320 */
1321 WARN_ON(state != DP_SSS_PWR_ON(pipe) && state != DP_SSS_PWR_GATE(pipe));
1322 enabled = state == DP_SSS_PWR_ON(pipe);
1323
1324 /*
1325 * A transient state at this point would mean some unexpected party
1326 * is poking at the power controls too.
1327 */
1328 ctrl = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) & DP_SSC_MASK(pipe);
1329 WARN_ON(ctrl << 16 != state);
1330
1331 mutex_unlock(&dev_priv->rps.hw_lock);
1332
1333 return enabled;
1334 }
1335
1336 static void chv_set_pipe_power_well(struct drm_i915_private *dev_priv,
1337 struct i915_power_well *power_well,
1338 bool enable)
1339 {
1340 enum pipe pipe = power_well->data;
1341 u32 state;
1342 u32 ctrl;
1343
1344 state = enable ? DP_SSS_PWR_ON(pipe) : DP_SSS_PWR_GATE(pipe);
1345
1346 mutex_lock(&dev_priv->rps.hw_lock);
1347
1348 #define COND \
1349 ((vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) & DP_SSS_MASK(pipe)) == state)
1350
1351 if (COND)
1352 goto out;
1353
1354 ctrl = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ);
1355 ctrl &= ~DP_SSC_MASK(pipe);
1356 ctrl |= enable ? DP_SSC_PWR_ON(pipe) : DP_SSC_PWR_GATE(pipe);
1357 vlv_punit_write(dev_priv, PUNIT_REG_DSPFREQ, ctrl);
1358
1359 if (wait_for(COND, 100))
1360 DRM_ERROR("timeout setting power well state %08x (%08x)\n",
1361 state,
1362 vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ));
1363
1364 #undef COND
1365
1366 out:
1367 mutex_unlock(&dev_priv->rps.hw_lock);
1368 }
1369
1370 static void chv_pipe_power_well_sync_hw(struct drm_i915_private *dev_priv,
1371 struct i915_power_well *power_well)
1372 {
1373 WARN_ON_ONCE(power_well->data != PIPE_A);
1374
1375 chv_set_pipe_power_well(dev_priv, power_well, power_well->count > 0);
1376 }
1377
1378 static void chv_pipe_power_well_enable(struct drm_i915_private *dev_priv,
1379 struct i915_power_well *power_well)
1380 {
1381 WARN_ON_ONCE(power_well->data != PIPE_A);
1382
1383 chv_set_pipe_power_well(dev_priv, power_well, true);
1384
1385 vlv_display_power_well_init(dev_priv);
1386 }
1387
1388 static void chv_pipe_power_well_disable(struct drm_i915_private *dev_priv,
1389 struct i915_power_well *power_well)
1390 {
1391 WARN_ON_ONCE(power_well->data != PIPE_A);
1392
1393 vlv_display_power_well_deinit(dev_priv);
1394
1395 chv_set_pipe_power_well(dev_priv, power_well, false);
1396 }
1397
1398 /**
1399 * intel_display_power_get - grab a power domain reference
1400 * @dev_priv: i915 device instance
1401 * @domain: power domain to reference
1402 *
1403 * This function grabs a power domain reference for @domain and ensures that the
1404 * power domain and all its parents are powered up. Therefore users should only
1405 * grab a reference to the innermost power domain they need.
1406 *
1407 * Any power domain reference obtained by this function must have a symmetric
1408 * call to intel_display_power_put() to release the reference again.
1409 */
1410 void intel_display_power_get(struct drm_i915_private *dev_priv,
1411 enum intel_display_power_domain domain)
1412 {
1413 struct i915_power_domains *power_domains;
1414 struct i915_power_well *power_well;
1415 int i;
1416
1417 intel_runtime_pm_get(dev_priv);
1418
1419 power_domains = &dev_priv->power_domains;
1420
1421 mutex_lock(&power_domains->lock);
1422
1423 for_each_power_well(i, power_well, BIT(domain), power_domains) {
1424 if (!power_well->count++)
1425 intel_power_well_enable(dev_priv, power_well);
1426 }
1427
1428 power_domains->domain_use_count[domain]++;
1429
1430 mutex_unlock(&power_domains->lock);
1431 }
1432
1433 /**
1434 * intel_display_power_put - release a power domain reference
1435 * @dev_priv: i915 device instance
1436 * @domain: power domain to reference
1437 *
1438 * This function drops the power domain reference obtained by
1439 * intel_display_power_get() and might power down the corresponding hardware
1440 * block right away if this is the last reference.
1441 */
1442 void intel_display_power_put(struct drm_i915_private *dev_priv,
1443 enum intel_display_power_domain domain)
1444 {
1445 struct i915_power_domains *power_domains;
1446 struct i915_power_well *power_well;
1447 int i;
1448
1449 power_domains = &dev_priv->power_domains;
1450
1451 mutex_lock(&power_domains->lock);
1452
1453 WARN_ON(!power_domains->domain_use_count[domain]);
1454 power_domains->domain_use_count[domain]--;
1455
1456 for_each_power_well_rev(i, power_well, BIT(domain), power_domains) {
1457 WARN_ON(!power_well->count);
1458
1459 if (!--power_well->count && i915.disable_power_well)
1460 intel_power_well_disable(dev_priv, power_well);
1461 }
1462
1463 mutex_unlock(&power_domains->lock);
1464
1465 intel_runtime_pm_put(dev_priv);
1466 }
1467
1468 #define HSW_ALWAYS_ON_POWER_DOMAINS ( \
1469 BIT(POWER_DOMAIN_PIPE_A) | \
1470 BIT(POWER_DOMAIN_TRANSCODER_EDP) | \
1471 BIT(POWER_DOMAIN_PORT_DDI_A_2_LANES) | \
1472 BIT(POWER_DOMAIN_PORT_DDI_A_4_LANES) | \
1473 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \
1474 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \
1475 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \
1476 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \
1477 BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) | \
1478 BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) | \
1479 BIT(POWER_DOMAIN_PORT_CRT) | \
1480 BIT(POWER_DOMAIN_PLLS) | \
1481 BIT(POWER_DOMAIN_AUX_A) | \
1482 BIT(POWER_DOMAIN_AUX_B) | \
1483 BIT(POWER_DOMAIN_AUX_C) | \
1484 BIT(POWER_DOMAIN_AUX_D) | \
1485 BIT(POWER_DOMAIN_INIT))
1486 #define HSW_DISPLAY_POWER_DOMAINS ( \
1487 (POWER_DOMAIN_MASK & ~HSW_ALWAYS_ON_POWER_DOMAINS) | \
1488 BIT(POWER_DOMAIN_INIT))
1489
1490 #define BDW_ALWAYS_ON_POWER_DOMAINS ( \
1491 HSW_ALWAYS_ON_POWER_DOMAINS | \
1492 BIT(POWER_DOMAIN_PIPE_A_PANEL_FITTER))
1493 #define BDW_DISPLAY_POWER_DOMAINS ( \
1494 (POWER_DOMAIN_MASK & ~BDW_ALWAYS_ON_POWER_DOMAINS) | \
1495 BIT(POWER_DOMAIN_INIT))
1496
1497 #define VLV_ALWAYS_ON_POWER_DOMAINS BIT(POWER_DOMAIN_INIT)
1498 #define VLV_DISPLAY_POWER_DOMAINS POWER_DOMAIN_MASK
1499
1500 #define VLV_DPIO_CMN_BC_POWER_DOMAINS ( \
1501 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \
1502 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \
1503 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \
1504 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \
1505 BIT(POWER_DOMAIN_PORT_CRT) | \
1506 BIT(POWER_DOMAIN_AUX_B) | \
1507 BIT(POWER_DOMAIN_AUX_C) | \
1508 BIT(POWER_DOMAIN_INIT))
1509
1510 #define VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS ( \
1511 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \
1512 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \
1513 BIT(POWER_DOMAIN_AUX_B) | \
1514 BIT(POWER_DOMAIN_INIT))
1515
1516 #define VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS ( \
1517 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \
1518 BIT(POWER_DOMAIN_AUX_B) | \
1519 BIT(POWER_DOMAIN_INIT))
1520
1521 #define VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS ( \
1522 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \
1523 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \
1524 BIT(POWER_DOMAIN_AUX_C) | \
1525 BIT(POWER_DOMAIN_INIT))
1526
1527 #define VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS ( \
1528 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \
1529 BIT(POWER_DOMAIN_AUX_C) | \
1530 BIT(POWER_DOMAIN_INIT))
1531
1532 #define CHV_DPIO_CMN_BC_POWER_DOMAINS ( \
1533 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \
1534 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \
1535 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \
1536 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \
1537 BIT(POWER_DOMAIN_AUX_B) | \
1538 BIT(POWER_DOMAIN_AUX_C) | \
1539 BIT(POWER_DOMAIN_INIT))
1540
1541 #define CHV_DPIO_CMN_D_POWER_DOMAINS ( \
1542 BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) | \
1543 BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) | \
1544 BIT(POWER_DOMAIN_AUX_D) | \
1545 BIT(POWER_DOMAIN_INIT))
1546
1547 static const struct i915_power_well_ops i9xx_always_on_power_well_ops = {
1548 .sync_hw = i9xx_always_on_power_well_noop,
1549 .enable = i9xx_always_on_power_well_noop,
1550 .disable = i9xx_always_on_power_well_noop,
1551 .is_enabled = i9xx_always_on_power_well_enabled,
1552 };
1553
1554 static const struct i915_power_well_ops chv_pipe_power_well_ops = {
1555 .sync_hw = chv_pipe_power_well_sync_hw,
1556 .enable = chv_pipe_power_well_enable,
1557 .disable = chv_pipe_power_well_disable,
1558 .is_enabled = chv_pipe_power_well_enabled,
1559 };
1560
1561 static const struct i915_power_well_ops chv_dpio_cmn_power_well_ops = {
1562 .sync_hw = vlv_power_well_sync_hw,
1563 .enable = chv_dpio_cmn_power_well_enable,
1564 .disable = chv_dpio_cmn_power_well_disable,
1565 .is_enabled = vlv_power_well_enabled,
1566 };
1567
1568 static struct i915_power_well i9xx_always_on_power_well[] = {
1569 {
1570 .name = "always-on",
1571 .always_on = 1,
1572 .domains = POWER_DOMAIN_MASK,
1573 .ops = &i9xx_always_on_power_well_ops,
1574 },
1575 };
1576
1577 static const struct i915_power_well_ops hsw_power_well_ops = {
1578 .sync_hw = hsw_power_well_sync_hw,
1579 .enable = hsw_power_well_enable,
1580 .disable = hsw_power_well_disable,
1581 .is_enabled = hsw_power_well_enabled,
1582 };
1583
1584 static const struct i915_power_well_ops skl_power_well_ops = {
1585 .sync_hw = skl_power_well_sync_hw,
1586 .enable = skl_power_well_enable,
1587 .disable = skl_power_well_disable,
1588 .is_enabled = skl_power_well_enabled,
1589 };
1590
1591 static struct i915_power_well hsw_power_wells[] = {
1592 {
1593 .name = "always-on",
1594 .always_on = 1,
1595 .domains = HSW_ALWAYS_ON_POWER_DOMAINS,
1596 .ops = &i9xx_always_on_power_well_ops,
1597 },
1598 {
1599 .name = "display",
1600 .domains = HSW_DISPLAY_POWER_DOMAINS,
1601 .ops = &hsw_power_well_ops,
1602 },
1603 };
1604
1605 static struct i915_power_well bdw_power_wells[] = {
1606 {
1607 .name = "always-on",
1608 .always_on = 1,
1609 .domains = BDW_ALWAYS_ON_POWER_DOMAINS,
1610 .ops = &i9xx_always_on_power_well_ops,
1611 },
1612 {
1613 .name = "display",
1614 .domains = BDW_DISPLAY_POWER_DOMAINS,
1615 .ops = &hsw_power_well_ops,
1616 },
1617 };
1618
1619 static const struct i915_power_well_ops vlv_display_power_well_ops = {
1620 .sync_hw = vlv_power_well_sync_hw,
1621 .enable = vlv_display_power_well_enable,
1622 .disable = vlv_display_power_well_disable,
1623 .is_enabled = vlv_power_well_enabled,
1624 };
1625
1626 static const struct i915_power_well_ops vlv_dpio_cmn_power_well_ops = {
1627 .sync_hw = vlv_power_well_sync_hw,
1628 .enable = vlv_dpio_cmn_power_well_enable,
1629 .disable = vlv_dpio_cmn_power_well_disable,
1630 .is_enabled = vlv_power_well_enabled,
1631 };
1632
1633 static const struct i915_power_well_ops vlv_dpio_power_well_ops = {
1634 .sync_hw = vlv_power_well_sync_hw,
1635 .enable = vlv_power_well_enable,
1636 .disable = vlv_power_well_disable,
1637 .is_enabled = vlv_power_well_enabled,
1638 };
1639
1640 static struct i915_power_well vlv_power_wells[] = {
1641 {
1642 .name = "always-on",
1643 .always_on = 1,
1644 .domains = VLV_ALWAYS_ON_POWER_DOMAINS,
1645 .ops = &i9xx_always_on_power_well_ops,
1646 },
1647 {
1648 .name = "display",
1649 .domains = VLV_DISPLAY_POWER_DOMAINS,
1650 .data = PUNIT_POWER_WELL_DISP2D,
1651 .ops = &vlv_display_power_well_ops,
1652 },
1653 {
1654 .name = "dpio-tx-b-01",
1655 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS |
1656 VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS |
1657 VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS |
1658 VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
1659 .ops = &vlv_dpio_power_well_ops,
1660 .data = PUNIT_POWER_WELL_DPIO_TX_B_LANES_01,
1661 },
1662 {
1663 .name = "dpio-tx-b-23",
1664 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS |
1665 VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS |
1666 VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS |
1667 VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
1668 .ops = &vlv_dpio_power_well_ops,
1669 .data = PUNIT_POWER_WELL_DPIO_TX_B_LANES_23,
1670 },
1671 {
1672 .name = "dpio-tx-c-01",
1673 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS |
1674 VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS |
1675 VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS |
1676 VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
1677 .ops = &vlv_dpio_power_well_ops,
1678 .data = PUNIT_POWER_WELL_DPIO_TX_C_LANES_01,
1679 },
1680 {
1681 .name = "dpio-tx-c-23",
1682 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS |
1683 VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS |
1684 VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS |
1685 VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS,
1686 .ops = &vlv_dpio_power_well_ops,
1687 .data = PUNIT_POWER_WELL_DPIO_TX_C_LANES_23,
1688 },
1689 {
1690 .name = "dpio-common",
1691 .domains = VLV_DPIO_CMN_BC_POWER_DOMAINS,
1692 .data = PUNIT_POWER_WELL_DPIO_CMN_BC,
1693 .ops = &vlv_dpio_cmn_power_well_ops,
1694 },
1695 };
1696
1697 static struct i915_power_well chv_power_wells[] = {
1698 {
1699 .name = "always-on",
1700 .always_on = 1,
1701 .domains = VLV_ALWAYS_ON_POWER_DOMAINS,
1702 .ops = &i9xx_always_on_power_well_ops,
1703 },
1704 {
1705 .name = "display",
1706 /*
1707 * Pipe A power well is the new disp2d well. Pipe B and C
1708 * power wells don't actually exist. Pipe A power well is
1709 * required for any pipe to work.
1710 */
1711 .domains = VLV_DISPLAY_POWER_DOMAINS,
1712 .data = PIPE_A,
1713 .ops = &chv_pipe_power_well_ops,
1714 },
1715 {
1716 .name = "dpio-common-bc",
1717 .domains = CHV_DPIO_CMN_BC_POWER_DOMAINS,
1718 .data = PUNIT_POWER_WELL_DPIO_CMN_BC,
1719 .ops = &chv_dpio_cmn_power_well_ops,
1720 },
1721 {
1722 .name = "dpio-common-d",
1723 .domains = CHV_DPIO_CMN_D_POWER_DOMAINS,
1724 .data = PUNIT_POWER_WELL_DPIO_CMN_D,
1725 .ops = &chv_dpio_cmn_power_well_ops,
1726 },
1727 };
1728
1729 bool intel_display_power_well_is_enabled(struct drm_i915_private *dev_priv,
1730 int power_well_id)
1731 {
1732 struct i915_power_well *power_well;
1733 bool ret;
1734
1735 power_well = lookup_power_well(dev_priv, power_well_id);
1736 ret = power_well->ops->is_enabled(dev_priv, power_well);
1737
1738 return ret;
1739 }
1740
1741 static struct i915_power_well skl_power_wells[] = {
1742 {
1743 .name = "always-on",
1744 .always_on = 1,
1745 .domains = SKL_DISPLAY_ALWAYS_ON_POWER_DOMAINS,
1746 .ops = &i9xx_always_on_power_well_ops,
1747 },
1748 {
1749 .name = "power well 1",
1750 .domains = SKL_DISPLAY_POWERWELL_1_POWER_DOMAINS,
1751 .ops = &skl_power_well_ops,
1752 .data = SKL_DISP_PW_1,
1753 },
1754 {
1755 .name = "MISC IO power well",
1756 .domains = SKL_DISPLAY_MISC_IO_POWER_DOMAINS,
1757 .ops = &skl_power_well_ops,
1758 .data = SKL_DISP_PW_MISC_IO,
1759 },
1760 {
1761 .name = "power well 2",
1762 .domains = SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS,
1763 .ops = &skl_power_well_ops,
1764 .data = SKL_DISP_PW_2,
1765 },
1766 {
1767 .name = "DDI A/E power well",
1768 .domains = SKL_DISPLAY_DDI_A_E_POWER_DOMAINS,
1769 .ops = &skl_power_well_ops,
1770 .data = SKL_DISP_PW_DDI_A_E,
1771 },
1772 {
1773 .name = "DDI B power well",
1774 .domains = SKL_DISPLAY_DDI_B_POWER_DOMAINS,
1775 .ops = &skl_power_well_ops,
1776 .data = SKL_DISP_PW_DDI_B,
1777 },
1778 {
1779 .name = "DDI C power well",
1780 .domains = SKL_DISPLAY_DDI_C_POWER_DOMAINS,
1781 .ops = &skl_power_well_ops,
1782 .data = SKL_DISP_PW_DDI_C,
1783 },
1784 {
1785 .name = "DDI D power well",
1786 .domains = SKL_DISPLAY_DDI_D_POWER_DOMAINS,
1787 .ops = &skl_power_well_ops,
1788 .data = SKL_DISP_PW_DDI_D,
1789 },
1790 };
1791
1792 static struct i915_power_well bxt_power_wells[] = {
1793 {
1794 .name = "always-on",
1795 .always_on = 1,
1796 .domains = BXT_DISPLAY_ALWAYS_ON_POWER_DOMAINS,
1797 .ops = &i9xx_always_on_power_well_ops,
1798 },
1799 {
1800 .name = "power well 1",
1801 .domains = BXT_DISPLAY_POWERWELL_1_POWER_DOMAINS,
1802 .ops = &skl_power_well_ops,
1803 .data = SKL_DISP_PW_1,
1804 },
1805 {
1806 .name = "power well 2",
1807 .domains = BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS,
1808 .ops = &skl_power_well_ops,
1809 .data = SKL_DISP_PW_2,
1810 }
1811 };
1812
1813 #define set_power_wells(power_domains, __power_wells) ({ \
1814 (power_domains)->power_wells = (__power_wells); \
1815 (power_domains)->power_well_count = ARRAY_SIZE(__power_wells); \
1816 })
1817
1818 /**
1819 * intel_power_domains_init - initializes the power domain structures
1820 * @dev_priv: i915 device instance
1821 *
1822 * Initializes the power domain structures for @dev_priv depending upon the
1823 * supported platform.
1824 */
1825 int intel_power_domains_init(struct drm_i915_private *dev_priv)
1826 {
1827 struct i915_power_domains *power_domains = &dev_priv->power_domains;
1828
1829 mutex_init(&power_domains->lock);
1830
1831 /*
1832 * The enabling order will be from lower to higher indexed wells,
1833 * the disabling order is reversed.
1834 */
1835 if (IS_HASWELL(dev_priv->dev)) {
1836 set_power_wells(power_domains, hsw_power_wells);
1837 } else if (IS_BROADWELL(dev_priv->dev)) {
1838 set_power_wells(power_domains, bdw_power_wells);
1839 } else if (IS_SKYLAKE(dev_priv->dev)) {
1840 set_power_wells(power_domains, skl_power_wells);
1841 } else if (IS_BROXTON(dev_priv->dev)) {
1842 set_power_wells(power_domains, bxt_power_wells);
1843 } else if (IS_CHERRYVIEW(dev_priv->dev)) {
1844 set_power_wells(power_domains, chv_power_wells);
1845 } else if (IS_VALLEYVIEW(dev_priv->dev)) {
1846 set_power_wells(power_domains, vlv_power_wells);
1847 } else {
1848 set_power_wells(power_domains, i9xx_always_on_power_well);
1849 }
1850
1851 return 0;
1852 }
1853
1854 static void intel_runtime_pm_disable(struct drm_i915_private *dev_priv)
1855 {
1856 struct drm_device *dev = dev_priv->dev;
1857 struct device *device = &dev->pdev->dev;
1858
1859 if (!HAS_RUNTIME_PM(dev))
1860 return;
1861
1862 if (!intel_enable_rc6(dev))
1863 return;
1864
1865 /* Make sure we're not suspended first. */
1866 pm_runtime_get_sync(device);
1867 }
1868
1869 /**
1870 * intel_power_domains_fini - finalizes the power domain structures
1871 * @dev_priv: i915 device instance
1872 *
1873 * Finalizes the power domain structures for @dev_priv depending upon the
1874 * supported platform. This function also disables runtime pm and ensures that
1875 * the device stays powered up so that the driver can be reloaded.
1876 */
1877 void intel_power_domains_fini(struct drm_i915_private *dev_priv)
1878 {
1879 intel_runtime_pm_disable(dev_priv);
1880
1881 /* The i915.ko module is still not prepared to be loaded when
1882 * the power well is not enabled, so just enable it in case
1883 * we're going to unload/reload. */
1884 intel_display_set_init_power(dev_priv, true);
1885 }
1886
1887 static void intel_power_domains_resume(struct drm_i915_private *dev_priv)
1888 {
1889 struct i915_power_domains *power_domains = &dev_priv->power_domains;
1890 struct i915_power_well *power_well;
1891 int i;
1892
1893 mutex_lock(&power_domains->lock);
1894 for_each_power_well(i, power_well, POWER_DOMAIN_MASK, power_domains) {
1895 power_well->ops->sync_hw(dev_priv, power_well);
1896 power_well->hw_enabled = power_well->ops->is_enabled(dev_priv,
1897 power_well);
1898 }
1899 mutex_unlock(&power_domains->lock);
1900 }
1901
1902 static void chv_phy_control_init(struct drm_i915_private *dev_priv)
1903 {
1904 struct i915_power_well *cmn_bc =
1905 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_BC);
1906 struct i915_power_well *cmn_d =
1907 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_D);
1908
1909 /*
1910 * DISPLAY_PHY_CONTROL can get corrupted if read. As a
1911 * workaround never ever read DISPLAY_PHY_CONTROL, and
1912 * instead maintain a shadow copy ourselves. Use the actual
1913 * power well state and lane status to reconstruct the
1914 * expected initial value.
1915 */
1916 dev_priv->chv_phy_control =
1917 PHY_LDO_SEQ_DELAY(PHY_LDO_DELAY_600NS, DPIO_PHY0) |
1918 PHY_LDO_SEQ_DELAY(PHY_LDO_DELAY_600NS, DPIO_PHY1) |
1919 PHY_CH_POWER_MODE(PHY_CH_DEEP_PSR, DPIO_PHY0, DPIO_CH0) |
1920 PHY_CH_POWER_MODE(PHY_CH_DEEP_PSR, DPIO_PHY0, DPIO_CH1) |
1921 PHY_CH_POWER_MODE(PHY_CH_DEEP_PSR, DPIO_PHY1, DPIO_CH0);
1922
1923 /*
1924 * If all lanes are disabled we leave the override disabled
1925 * with all power down bits cleared to match the state we
1926 * would use after disabling the port. Otherwise enable the
1927 * override and set the lane powerdown bits accding to the
1928 * current lane status.
1929 */
1930 if (cmn_bc->ops->is_enabled(dev_priv, cmn_bc)) {
1931 uint32_t status = I915_READ(DPLL(PIPE_A));
1932 unsigned int mask;
1933
1934 mask = status & DPLL_PORTB_READY_MASK;
1935 if (mask == 0xf)
1936 mask = 0x0;
1937 else
1938 dev_priv->chv_phy_control |=
1939 PHY_CH_POWER_DOWN_OVRD_EN(DPIO_PHY0, DPIO_CH0);
1940
1941 dev_priv->chv_phy_control |=
1942 PHY_CH_POWER_DOWN_OVRD(mask, DPIO_PHY0, DPIO_CH0);
1943
1944 mask = (status & DPLL_PORTC_READY_MASK) >> 4;
1945 if (mask == 0xf)
1946 mask = 0x0;
1947 else
1948 dev_priv->chv_phy_control |=
1949 PHY_CH_POWER_DOWN_OVRD_EN(DPIO_PHY0, DPIO_CH1);
1950
1951 dev_priv->chv_phy_control |=
1952 PHY_CH_POWER_DOWN_OVRD(mask, DPIO_PHY0, DPIO_CH1);
1953
1954 dev_priv->chv_phy_control |= PHY_COM_LANE_RESET_DEASSERT(DPIO_PHY0);
1955
1956 dev_priv->chv_phy_assert[DPIO_PHY0] = false;
1957 } else {
1958 dev_priv->chv_phy_assert[DPIO_PHY0] = true;
1959 }
1960
1961 if (cmn_d->ops->is_enabled(dev_priv, cmn_d)) {
1962 uint32_t status = I915_READ(DPIO_PHY_STATUS);
1963 unsigned int mask;
1964
1965 mask = status & DPLL_PORTD_READY_MASK;
1966
1967 if (mask == 0xf)
1968 mask = 0x0;
1969 else
1970 dev_priv->chv_phy_control |=
1971 PHY_CH_POWER_DOWN_OVRD_EN(DPIO_PHY1, DPIO_CH0);
1972
1973 dev_priv->chv_phy_control |=
1974 PHY_CH_POWER_DOWN_OVRD(mask, DPIO_PHY1, DPIO_CH0);
1975
1976 dev_priv->chv_phy_control |= PHY_COM_LANE_RESET_DEASSERT(DPIO_PHY1);
1977
1978 dev_priv->chv_phy_assert[DPIO_PHY1] = false;
1979 } else {
1980 dev_priv->chv_phy_assert[DPIO_PHY1] = true;
1981 }
1982
1983 I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control);
1984
1985 DRM_DEBUG_KMS("Initial PHY_CONTROL=0x%08x\n",
1986 dev_priv->chv_phy_control);
1987 }
1988
1989 static void vlv_cmnlane_wa(struct drm_i915_private *dev_priv)
1990 {
1991 struct i915_power_well *cmn =
1992 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_BC);
1993 struct i915_power_well *disp2d =
1994 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DISP2D);
1995
1996 /* If the display might be already active skip this */
1997 if (cmn->ops->is_enabled(dev_priv, cmn) &&
1998 disp2d->ops->is_enabled(dev_priv, disp2d) &&
1999 I915_READ(DPIO_CTL) & DPIO_CMNRST)
2000 return;
2001
2002 DRM_DEBUG_KMS("toggling display PHY side reset\n");
2003
2004 /* cmnlane needs DPLL registers */
2005 disp2d->ops->enable(dev_priv, disp2d);
2006
2007 /*
2008 * From VLV2A0_DP_eDP_HDMI_DPIO_driver_vbios_notes_11.docx:
2009 * Need to assert and de-assert PHY SB reset by gating the
2010 * common lane power, then un-gating it.
2011 * Simply ungating isn't enough to reset the PHY enough to get
2012 * ports and lanes running.
2013 */
2014 cmn->ops->disable(dev_priv, cmn);
2015 }
2016
2017 /**
2018 * intel_power_domains_init_hw - initialize hardware power domain state
2019 * @dev_priv: i915 device instance
2020 *
2021 * This function initializes the hardware power domain state and enables all
2022 * power domains using intel_display_set_init_power().
2023 */
2024 void intel_power_domains_init_hw(struct drm_i915_private *dev_priv)
2025 {
2026 struct drm_device *dev = dev_priv->dev;
2027 struct i915_power_domains *power_domains = &dev_priv->power_domains;
2028
2029 power_domains->initializing = true;
2030
2031 if (IS_CHERRYVIEW(dev)) {
2032 mutex_lock(&power_domains->lock);
2033 chv_phy_control_init(dev_priv);
2034 mutex_unlock(&power_domains->lock);
2035 } else if (IS_VALLEYVIEW(dev)) {
2036 mutex_lock(&power_domains->lock);
2037 vlv_cmnlane_wa(dev_priv);
2038 mutex_unlock(&power_domains->lock);
2039 }
2040
2041 /* For now, we need the power well to be always enabled. */
2042 intel_display_set_init_power(dev_priv, true);
2043 intel_power_domains_resume(dev_priv);
2044 power_domains->initializing = false;
2045 }
2046
2047 /**
2048 * intel_aux_display_runtime_get - grab an auxiliary power domain reference
2049 * @dev_priv: i915 device instance
2050 *
2051 * This function grabs a power domain reference for the auxiliary power domain
2052 * (for access to the GMBUS and DP AUX blocks) and ensures that it and all its
2053 * parents are powered up. Therefore users should only grab a reference to the
2054 * innermost power domain they need.
2055 *
2056 * Any power domain reference obtained by this function must have a symmetric
2057 * call to intel_aux_display_runtime_put() to release the reference again.
2058 */
2059 void intel_aux_display_runtime_get(struct drm_i915_private *dev_priv)
2060 {
2061 intel_runtime_pm_get(dev_priv);
2062 }
2063
2064 /**
2065 * intel_aux_display_runtime_put - release an auxiliary power domain reference
2066 * @dev_priv: i915 device instance
2067 *
2068 * This function drops the auxiliary power domain reference obtained by
2069 * intel_aux_display_runtime_get() and might power down the corresponding
2070 * hardware block right away if this is the last reference.
2071 */
2072 void intel_aux_display_runtime_put(struct drm_i915_private *dev_priv)
2073 {
2074 intel_runtime_pm_put(dev_priv);
2075 }
2076
2077 /**
2078 * intel_runtime_pm_get - grab a runtime pm reference
2079 * @dev_priv: i915 device instance
2080 *
2081 * This function grabs a device-level runtime pm reference (mostly used for GEM
2082 * code to ensure the GTT or GT is on) and ensures that it is powered up.
2083 *
2084 * Any runtime pm reference obtained by this function must have a symmetric
2085 * call to intel_runtime_pm_put() to release the reference again.
2086 */
2087 void intel_runtime_pm_get(struct drm_i915_private *dev_priv)
2088 {
2089 struct drm_device *dev = dev_priv->dev;
2090 struct device *device = &dev->pdev->dev;
2091
2092 if (!HAS_RUNTIME_PM(dev))
2093 return;
2094
2095 pm_runtime_get_sync(device);
2096 WARN(dev_priv->pm.suspended, "Device still suspended.\n");
2097 }
2098
2099 /**
2100 * intel_runtime_pm_get_noresume - grab a runtime pm reference
2101 * @dev_priv: i915 device instance
2102 *
2103 * This function grabs a device-level runtime pm reference (mostly used for GEM
2104 * code to ensure the GTT or GT is on).
2105 *
2106 * It will _not_ power up the device but instead only check that it's powered
2107 * on. Therefore it is only valid to call this functions from contexts where
2108 * the device is known to be powered up and where trying to power it up would
2109 * result in hilarity and deadlocks. That pretty much means only the system
2110 * suspend/resume code where this is used to grab runtime pm references for
2111 * delayed setup down in work items.
2112 *
2113 * Any runtime pm reference obtained by this function must have a symmetric
2114 * call to intel_runtime_pm_put() to release the reference again.
2115 */
2116 void intel_runtime_pm_get_noresume(struct drm_i915_private *dev_priv)
2117 {
2118 struct drm_device *dev = dev_priv->dev;
2119 struct device *device = &dev->pdev->dev;
2120
2121 if (!HAS_RUNTIME_PM(dev))
2122 return;
2123
2124 WARN(dev_priv->pm.suspended, "Getting nosync-ref while suspended.\n");
2125 pm_runtime_get_noresume(device);
2126 }
2127
2128 /**
2129 * intel_runtime_pm_put - release a runtime pm reference
2130 * @dev_priv: i915 device instance
2131 *
2132 * This function drops the device-level runtime pm reference obtained by
2133 * intel_runtime_pm_get() and might power down the corresponding
2134 * hardware block right away if this is the last reference.
2135 */
2136 void intel_runtime_pm_put(struct drm_i915_private *dev_priv)
2137 {
2138 struct drm_device *dev = dev_priv->dev;
2139 struct device *device = &dev->pdev->dev;
2140
2141 if (!HAS_RUNTIME_PM(dev))
2142 return;
2143
2144 pm_runtime_mark_last_busy(device);
2145 pm_runtime_put_autosuspend(device);
2146 }
2147
2148 /**
2149 * intel_runtime_pm_enable - enable runtime pm
2150 * @dev_priv: i915 device instance
2151 *
2152 * This function enables runtime pm at the end of the driver load sequence.
2153 *
2154 * Note that this function does currently not enable runtime pm for the
2155 * subordinate display power domains. That is only done on the first modeset
2156 * using intel_display_set_init_power().
2157 */
2158 void intel_runtime_pm_enable(struct drm_i915_private *dev_priv)
2159 {
2160 struct drm_device *dev = dev_priv->dev;
2161 struct device *device = &dev->pdev->dev;
2162
2163 if (!HAS_RUNTIME_PM(dev))
2164 return;
2165
2166 /*
2167 * RPM depends on RC6 to save restore the GT HW context, so make RC6 a
2168 * requirement.
2169 */
2170 if (!intel_enable_rc6(dev)) {
2171 DRM_INFO("RC6 disabled, disabling runtime PM support\n");
2172 return;
2173 }
2174
2175 pm_runtime_set_autosuspend_delay(device, 10000); /* 10s */
2176 pm_runtime_mark_last_busy(device);
2177 pm_runtime_use_autosuspend(device);
2178
2179 pm_runtime_put_autosuspend(device);
2180 }
2181
Linux kernel - Deliverables
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