Commit | Line | Data |
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f721889f RW |
1 | /* |
2 | * drivers/base/power/domain.c - Common code related to device power domains. | |
3 | * | |
4 | * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. | |
5 | * | |
6 | * This file is released under the GPLv2. | |
7 | */ | |
8 | ||
9 | #include <linux/init.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/io.h> | |
12 | #include <linux/pm_runtime.h> | |
13 | #include <linux/pm_domain.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/err.h> | |
17b75eca RW |
16 | #include <linux/sched.h> |
17 | #include <linux/suspend.h> | |
f721889f | 18 | |
5248051b RW |
19 | #ifdef CONFIG_PM |
20 | ||
21 | static struct generic_pm_domain *dev_to_genpd(struct device *dev) | |
22 | { | |
23 | if (IS_ERR_OR_NULL(dev->pm_domain)) | |
24 | return ERR_PTR(-EINVAL); | |
25 | ||
596ba34b | 26 | return pd_to_genpd(dev->pm_domain); |
5248051b | 27 | } |
f721889f RW |
28 | |
29 | static void genpd_sd_counter_dec(struct generic_pm_domain *genpd) | |
30 | { | |
31 | if (!WARN_ON(genpd->sd_count == 0)) | |
32 | genpd->sd_count--; | |
33 | } | |
34 | ||
17b75eca RW |
35 | static void genpd_acquire_lock(struct generic_pm_domain *genpd) |
36 | { | |
37 | DEFINE_WAIT(wait); | |
38 | ||
39 | mutex_lock(&genpd->lock); | |
40 | /* | |
41 | * Wait for the domain to transition into either the active, | |
42 | * or the power off state. | |
43 | */ | |
44 | for (;;) { | |
45 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
46 | TASK_UNINTERRUPTIBLE); | |
c6d22b37 RW |
47 | if (genpd->status == GPD_STATE_ACTIVE |
48 | || genpd->status == GPD_STATE_POWER_OFF) | |
17b75eca RW |
49 | break; |
50 | mutex_unlock(&genpd->lock); | |
51 | ||
52 | schedule(); | |
53 | ||
54 | mutex_lock(&genpd->lock); | |
55 | } | |
56 | finish_wait(&genpd->status_wait_queue, &wait); | |
57 | } | |
58 | ||
59 | static void genpd_release_lock(struct generic_pm_domain *genpd) | |
60 | { | |
61 | mutex_unlock(&genpd->lock); | |
62 | } | |
63 | ||
c6d22b37 RW |
64 | static void genpd_set_active(struct generic_pm_domain *genpd) |
65 | { | |
66 | if (genpd->resume_count == 0) | |
67 | genpd->status = GPD_STATE_ACTIVE; | |
68 | } | |
69 | ||
5248051b RW |
70 | /** |
71 | * pm_genpd_poweron - Restore power to a given PM domain and its parents. | |
72 | * @genpd: PM domain to power up. | |
73 | * | |
74 | * Restore power to @genpd and all of its parents so that it is possible to | |
75 | * resume a device belonging to it. | |
76 | */ | |
18b4f3f5 | 77 | int pm_genpd_poweron(struct generic_pm_domain *genpd) |
5248051b | 78 | { |
17b75eca RW |
79 | struct generic_pm_domain *parent = genpd->parent; |
80 | DEFINE_WAIT(wait); | |
5248051b RW |
81 | int ret = 0; |
82 | ||
83 | start: | |
17b75eca | 84 | if (parent) { |
c6d22b37 | 85 | genpd_acquire_lock(parent); |
17b75eca RW |
86 | mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING); |
87 | } else { | |
88 | mutex_lock(&genpd->lock); | |
89 | } | |
17b75eca RW |
90 | |
91 | if (genpd->status == GPD_STATE_ACTIVE | |
596ba34b | 92 | || (genpd->prepared_count > 0 && genpd->suspend_power_off)) |
5248051b RW |
93 | goto out; |
94 | ||
c6d22b37 RW |
95 | if (genpd->status != GPD_STATE_POWER_OFF) { |
96 | genpd_set_active(genpd); | |
97 | goto out; | |
98 | } | |
99 | ||
17b75eca | 100 | if (parent && parent->status != GPD_STATE_ACTIVE) { |
5248051b | 101 | mutex_unlock(&genpd->lock); |
c6d22b37 | 102 | genpd_release_lock(parent); |
5248051b | 103 | |
17b75eca | 104 | ret = pm_genpd_poweron(parent); |
5248051b RW |
105 | if (ret) |
106 | return ret; | |
107 | ||
108 | goto start; | |
109 | } | |
110 | ||
111 | if (genpd->power_on) { | |
112 | int ret = genpd->power_on(genpd); | |
113 | if (ret) | |
114 | goto out; | |
115 | } | |
116 | ||
c6d22b37 | 117 | genpd_set_active(genpd); |
17b75eca RW |
118 | if (parent) |
119 | parent->sd_count++; | |
5248051b RW |
120 | |
121 | out: | |
122 | mutex_unlock(&genpd->lock); | |
17b75eca | 123 | if (parent) |
c6d22b37 | 124 | genpd_release_lock(parent); |
5248051b RW |
125 | |
126 | return ret; | |
127 | } | |
128 | ||
129 | #endif /* CONFIG_PM */ | |
130 | ||
131 | #ifdef CONFIG_PM_RUNTIME | |
132 | ||
f721889f RW |
133 | /** |
134 | * __pm_genpd_save_device - Save the pre-suspend state of a device. | |
135 | * @dle: Device list entry of the device to save the state of. | |
136 | * @genpd: PM domain the device belongs to. | |
137 | */ | |
138 | static int __pm_genpd_save_device(struct dev_list_entry *dle, | |
139 | struct generic_pm_domain *genpd) | |
17b75eca | 140 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f RW |
141 | { |
142 | struct device *dev = dle->dev; | |
143 | struct device_driver *drv = dev->driver; | |
144 | int ret = 0; | |
145 | ||
146 | if (dle->need_restore) | |
147 | return 0; | |
148 | ||
17b75eca RW |
149 | mutex_unlock(&genpd->lock); |
150 | ||
f721889f RW |
151 | if (drv && drv->pm && drv->pm->runtime_suspend) { |
152 | if (genpd->start_device) | |
153 | genpd->start_device(dev); | |
154 | ||
155 | ret = drv->pm->runtime_suspend(dev); | |
156 | ||
157 | if (genpd->stop_device) | |
158 | genpd->stop_device(dev); | |
159 | } | |
160 | ||
17b75eca RW |
161 | mutex_lock(&genpd->lock); |
162 | ||
f721889f RW |
163 | if (!ret) |
164 | dle->need_restore = true; | |
165 | ||
166 | return ret; | |
167 | } | |
168 | ||
169 | /** | |
170 | * __pm_genpd_restore_device - Restore the pre-suspend state of a device. | |
171 | * @dle: Device list entry of the device to restore the state of. | |
172 | * @genpd: PM domain the device belongs to. | |
173 | */ | |
174 | static void __pm_genpd_restore_device(struct dev_list_entry *dle, | |
175 | struct generic_pm_domain *genpd) | |
17b75eca | 176 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f RW |
177 | { |
178 | struct device *dev = dle->dev; | |
179 | struct device_driver *drv = dev->driver; | |
180 | ||
181 | if (!dle->need_restore) | |
182 | return; | |
183 | ||
17b75eca RW |
184 | mutex_unlock(&genpd->lock); |
185 | ||
f721889f RW |
186 | if (drv && drv->pm && drv->pm->runtime_resume) { |
187 | if (genpd->start_device) | |
188 | genpd->start_device(dev); | |
189 | ||
190 | drv->pm->runtime_resume(dev); | |
191 | ||
192 | if (genpd->stop_device) | |
193 | genpd->stop_device(dev); | |
194 | } | |
195 | ||
17b75eca RW |
196 | mutex_lock(&genpd->lock); |
197 | ||
f721889f RW |
198 | dle->need_restore = false; |
199 | } | |
200 | ||
c6d22b37 RW |
201 | /** |
202 | * genpd_abort_poweroff - Check if a PM domain power off should be aborted. | |
203 | * @genpd: PM domain to check. | |
204 | * | |
205 | * Return true if a PM domain's status changed to GPD_STATE_ACTIVE during | |
206 | * a "power off" operation, which means that a "power on" has occured in the | |
207 | * meantime, or if its resume_count field is different from zero, which means | |
208 | * that one of its devices has been resumed in the meantime. | |
209 | */ | |
210 | static bool genpd_abort_poweroff(struct generic_pm_domain *genpd) | |
211 | { | |
212 | return genpd->status == GPD_STATE_ACTIVE || genpd->resume_count > 0; | |
213 | } | |
214 | ||
f721889f RW |
215 | /** |
216 | * pm_genpd_poweroff - Remove power from a given PM domain. | |
217 | * @genpd: PM domain to power down. | |
218 | * | |
219 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
220 | * have been powered down, run the runtime suspend callbacks provided by all of | |
221 | * the @genpd's devices' drivers and remove power from @genpd. | |
222 | */ | |
223 | static int pm_genpd_poweroff(struct generic_pm_domain *genpd) | |
17b75eca | 224 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f RW |
225 | { |
226 | struct generic_pm_domain *parent; | |
227 | struct dev_list_entry *dle; | |
228 | unsigned int not_suspended; | |
c6d22b37 | 229 | int ret = 0; |
f721889f | 230 | |
c6d22b37 RW |
231 | start: |
232 | /* | |
233 | * Do not try to power off the domain in the following situations: | |
234 | * (1) The domain is already in the "power off" state. | |
235 | * (2) System suspend is in progress. | |
236 | * (3) One of the domain's devices is being resumed right now. | |
237 | */ | |
238 | if (genpd->status == GPD_STATE_POWER_OFF || genpd->prepared_count > 0 | |
239 | || genpd->resume_count > 0) | |
f721889f RW |
240 | return 0; |
241 | ||
242 | if (genpd->sd_count > 0) | |
243 | return -EBUSY; | |
244 | ||
245 | not_suspended = 0; | |
246 | list_for_each_entry(dle, &genpd->dev_list, node) | |
247 | if (dle->dev->driver && !pm_runtime_suspended(dle->dev)) | |
248 | not_suspended++; | |
249 | ||
250 | if (not_suspended > genpd->in_progress) | |
251 | return -EBUSY; | |
252 | ||
c6d22b37 RW |
253 | if (genpd->poweroff_task) { |
254 | /* | |
255 | * Another instance of pm_genpd_poweroff() is executing | |
256 | * callbacks, so tell it to start over and return. | |
257 | */ | |
258 | genpd->status = GPD_STATE_REPEAT; | |
259 | return 0; | |
260 | } | |
261 | ||
f721889f RW |
262 | if (genpd->gov && genpd->gov->power_down_ok) { |
263 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
264 | return -EAGAIN; | |
265 | } | |
266 | ||
17b75eca | 267 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 | 268 | genpd->poweroff_task = current; |
17b75eca | 269 | |
f721889f RW |
270 | list_for_each_entry_reverse(dle, &genpd->dev_list, node) { |
271 | ret = __pm_genpd_save_device(dle, genpd); | |
272 | if (ret) | |
273 | goto err_dev; | |
f721889f | 274 | |
c6d22b37 RW |
275 | if (genpd_abort_poweroff(genpd)) |
276 | goto out; | |
277 | ||
278 | if (genpd->status == GPD_STATE_REPEAT) { | |
279 | genpd->poweroff_task = NULL; | |
280 | goto start; | |
281 | } | |
282 | } | |
17b75eca RW |
283 | |
284 | parent = genpd->parent; | |
285 | if (parent) { | |
c6d22b37 RW |
286 | mutex_unlock(&genpd->lock); |
287 | ||
17b75eca RW |
288 | genpd_acquire_lock(parent); |
289 | mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING); | |
c6d22b37 RW |
290 | |
291 | if (genpd_abort_poweroff(genpd)) { | |
292 | genpd_release_lock(parent); | |
293 | goto out; | |
294 | } | |
17b75eca RW |
295 | } |
296 | ||
f721889f RW |
297 | if (genpd->power_off) |
298 | genpd->power_off(genpd); | |
299 | ||
17b75eca | 300 | genpd->status = GPD_STATE_POWER_OFF; |
f721889f | 301 | |
f721889f RW |
302 | if (parent) { |
303 | genpd_sd_counter_dec(parent); | |
304 | if (parent->sd_count == 0) | |
305 | queue_work(pm_wq, &parent->power_off_work); | |
17b75eca RW |
306 | |
307 | genpd_release_lock(parent); | |
f721889f RW |
308 | } |
309 | ||
c6d22b37 RW |
310 | out: |
311 | genpd->poweroff_task = NULL; | |
312 | wake_up_all(&genpd->status_wait_queue); | |
313 | return ret; | |
f721889f RW |
314 | |
315 | err_dev: | |
316 | list_for_each_entry_continue(dle, &genpd->dev_list, node) | |
317 | __pm_genpd_restore_device(dle, genpd); | |
318 | ||
c6d22b37 RW |
319 | genpd_set_active(genpd); |
320 | goto out; | |
f721889f RW |
321 | } |
322 | ||
323 | /** | |
324 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
325 | * @work: Work structure used for scheduling the execution of this function. | |
326 | */ | |
327 | static void genpd_power_off_work_fn(struct work_struct *work) | |
328 | { | |
329 | struct generic_pm_domain *genpd; | |
330 | ||
331 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
332 | ||
17b75eca | 333 | genpd_acquire_lock(genpd); |
f721889f | 334 | pm_genpd_poweroff(genpd); |
17b75eca | 335 | genpd_release_lock(genpd); |
f721889f RW |
336 | } |
337 | ||
338 | /** | |
339 | * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. | |
340 | * @dev: Device to suspend. | |
341 | * | |
342 | * Carry out a runtime suspend of a device under the assumption that its | |
343 | * pm_domain field points to the domain member of an object of type | |
344 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
345 | */ | |
346 | static int pm_genpd_runtime_suspend(struct device *dev) | |
347 | { | |
348 | struct generic_pm_domain *genpd; | |
349 | ||
350 | dev_dbg(dev, "%s()\n", __func__); | |
351 | ||
5248051b RW |
352 | genpd = dev_to_genpd(dev); |
353 | if (IS_ERR(genpd)) | |
f721889f RW |
354 | return -EINVAL; |
355 | ||
f721889f RW |
356 | if (genpd->stop_device) { |
357 | int ret = genpd->stop_device(dev); | |
358 | if (ret) | |
17b75eca | 359 | return ret; |
f721889f | 360 | } |
17b75eca | 361 | |
c6d22b37 | 362 | mutex_lock(&genpd->lock); |
f721889f RW |
363 | genpd->in_progress++; |
364 | pm_genpd_poweroff(genpd); | |
365 | genpd->in_progress--; | |
c6d22b37 | 366 | mutex_unlock(&genpd->lock); |
f721889f RW |
367 | |
368 | return 0; | |
369 | } | |
370 | ||
596ba34b RW |
371 | /** |
372 | * __pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
373 | * @dev: Device to resume. | |
374 | * @genpd: PM domain the device belongs to. | |
375 | */ | |
376 | static void __pm_genpd_runtime_resume(struct device *dev, | |
377 | struct generic_pm_domain *genpd) | |
378 | { | |
379 | struct dev_list_entry *dle; | |
380 | ||
381 | list_for_each_entry(dle, &genpd->dev_list, node) { | |
382 | if (dle->dev == dev) { | |
383 | __pm_genpd_restore_device(dle, genpd); | |
384 | break; | |
385 | } | |
386 | } | |
596ba34b RW |
387 | } |
388 | ||
f721889f RW |
389 | /** |
390 | * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
391 | * @dev: Device to resume. | |
392 | * | |
393 | * Carry out a runtime resume of a device under the assumption that its | |
394 | * pm_domain field points to the domain member of an object of type | |
395 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
396 | */ | |
397 | static int pm_genpd_runtime_resume(struct device *dev) | |
398 | { | |
399 | struct generic_pm_domain *genpd; | |
c6d22b37 | 400 | DEFINE_WAIT(wait); |
f721889f RW |
401 | int ret; |
402 | ||
403 | dev_dbg(dev, "%s()\n", __func__); | |
404 | ||
5248051b RW |
405 | genpd = dev_to_genpd(dev); |
406 | if (IS_ERR(genpd)) | |
f721889f RW |
407 | return -EINVAL; |
408 | ||
f721889f RW |
409 | ret = pm_genpd_poweron(genpd); |
410 | if (ret) | |
411 | return ret; | |
412 | ||
c6d22b37 | 413 | mutex_lock(&genpd->lock); |
17b75eca | 414 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 RW |
415 | genpd->resume_count++; |
416 | for (;;) { | |
417 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
418 | TASK_UNINTERRUPTIBLE); | |
419 | /* | |
420 | * If current is the powering off task, we have been called | |
421 | * reentrantly from one of the device callbacks, so we should | |
422 | * not wait. | |
423 | */ | |
424 | if (!genpd->poweroff_task || genpd->poweroff_task == current) | |
425 | break; | |
426 | mutex_unlock(&genpd->lock); | |
427 | ||
428 | schedule(); | |
429 | ||
430 | mutex_lock(&genpd->lock); | |
431 | } | |
432 | finish_wait(&genpd->status_wait_queue, &wait); | |
596ba34b | 433 | __pm_genpd_runtime_resume(dev, genpd); |
c6d22b37 RW |
434 | genpd->resume_count--; |
435 | genpd_set_active(genpd); | |
17b75eca | 436 | wake_up_all(&genpd->status_wait_queue); |
c6d22b37 | 437 | mutex_unlock(&genpd->lock); |
17b75eca RW |
438 | |
439 | if (genpd->start_device) | |
440 | genpd->start_device(dev); | |
f721889f RW |
441 | |
442 | return 0; | |
443 | } | |
444 | ||
445 | #else | |
446 | ||
447 | static inline void genpd_power_off_work_fn(struct work_struct *work) {} | |
596ba34b RW |
448 | static inline void __pm_genpd_runtime_resume(struct device *dev, |
449 | struct generic_pm_domain *genpd) {} | |
f721889f RW |
450 | |
451 | #define pm_genpd_runtime_suspend NULL | |
452 | #define pm_genpd_runtime_resume NULL | |
453 | ||
454 | #endif /* CONFIG_PM_RUNTIME */ | |
455 | ||
596ba34b RW |
456 | #ifdef CONFIG_PM_SLEEP |
457 | ||
458 | /** | |
459 | * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its parents. | |
460 | * @genpd: PM domain to power off, if possible. | |
461 | * | |
462 | * Check if the given PM domain can be powered off (during system suspend or | |
463 | * hibernation) and do that if so. Also, in that case propagate to its parent. | |
464 | * | |
465 | * This function is only called in "noirq" stages of system power transitions, | |
466 | * so it need not acquire locks (all of the "noirq" callbacks are executed | |
467 | * sequentially, so it is guaranteed that it will never run twice in parallel). | |
468 | */ | |
469 | static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd) | |
470 | { | |
471 | struct generic_pm_domain *parent = genpd->parent; | |
472 | ||
17b75eca | 473 | if (genpd->status == GPD_STATE_POWER_OFF) |
596ba34b RW |
474 | return; |
475 | ||
476 | if (genpd->suspended_count != genpd->device_count || genpd->sd_count > 0) | |
477 | return; | |
478 | ||
479 | if (genpd->power_off) | |
480 | genpd->power_off(genpd); | |
481 | ||
17b75eca | 482 | genpd->status = GPD_STATE_POWER_OFF; |
596ba34b RW |
483 | if (parent) { |
484 | genpd_sd_counter_dec(parent); | |
485 | pm_genpd_sync_poweroff(parent); | |
486 | } | |
487 | } | |
488 | ||
489 | /** | |
490 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
491 | * @dev: Device to start the transition of. | |
492 | * | |
493 | * Start a power transition of a device (during a system-wide power transition) | |
494 | * under the assumption that its pm_domain field points to the domain member of | |
495 | * an object of type struct generic_pm_domain representing a PM domain | |
496 | * consisting of I/O devices. | |
497 | */ | |
498 | static int pm_genpd_prepare(struct device *dev) | |
499 | { | |
500 | struct generic_pm_domain *genpd; | |
b6c10c84 | 501 | int ret; |
596ba34b RW |
502 | |
503 | dev_dbg(dev, "%s()\n", __func__); | |
504 | ||
505 | genpd = dev_to_genpd(dev); | |
506 | if (IS_ERR(genpd)) | |
507 | return -EINVAL; | |
508 | ||
17b75eca RW |
509 | /* |
510 | * If a wakeup request is pending for the device, it should be woken up | |
511 | * at this point and a system wakeup event should be reported if it's | |
512 | * set up to wake up the system from sleep states. | |
513 | */ | |
514 | pm_runtime_get_noresume(dev); | |
515 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) | |
516 | pm_wakeup_event(dev, 0); | |
517 | ||
518 | if (pm_wakeup_pending()) { | |
519 | pm_runtime_put_sync(dev); | |
520 | return -EBUSY; | |
521 | } | |
522 | ||
523 | genpd_acquire_lock(genpd); | |
596ba34b RW |
524 | |
525 | if (genpd->prepared_count++ == 0) | |
17b75eca RW |
526 | genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; |
527 | ||
528 | genpd_release_lock(genpd); | |
596ba34b RW |
529 | |
530 | if (genpd->suspend_power_off) { | |
17b75eca | 531 | pm_runtime_put_noidle(dev); |
596ba34b RW |
532 | return 0; |
533 | } | |
534 | ||
535 | /* | |
17b75eca RW |
536 | * The PM domain must be in the GPD_STATE_ACTIVE state at this point, |
537 | * so pm_genpd_poweron() will return immediately, but if the device | |
538 | * is suspended (e.g. it's been stopped by .stop_device()), we need | |
539 | * to make it operational. | |
596ba34b | 540 | */ |
17b75eca | 541 | pm_runtime_resume(dev); |
596ba34b RW |
542 | __pm_runtime_disable(dev, false); |
543 | ||
b6c10c84 RW |
544 | ret = pm_generic_prepare(dev); |
545 | if (ret) { | |
546 | mutex_lock(&genpd->lock); | |
547 | ||
548 | if (--genpd->prepared_count == 0) | |
549 | genpd->suspend_power_off = false; | |
550 | ||
551 | mutex_unlock(&genpd->lock); | |
17b75eca | 552 | pm_runtime_enable(dev); |
b6c10c84 | 553 | } |
17b75eca RW |
554 | |
555 | pm_runtime_put_sync(dev); | |
b6c10c84 | 556 | return ret; |
596ba34b RW |
557 | } |
558 | ||
559 | /** | |
560 | * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. | |
561 | * @dev: Device to suspend. | |
562 | * | |
563 | * Suspend a device under the assumption that its pm_domain field points to the | |
564 | * domain member of an object of type struct generic_pm_domain representing | |
565 | * a PM domain consisting of I/O devices. | |
566 | */ | |
567 | static int pm_genpd_suspend(struct device *dev) | |
568 | { | |
569 | struct generic_pm_domain *genpd; | |
570 | ||
571 | dev_dbg(dev, "%s()\n", __func__); | |
572 | ||
573 | genpd = dev_to_genpd(dev); | |
574 | if (IS_ERR(genpd)) | |
575 | return -EINVAL; | |
576 | ||
577 | return genpd->suspend_power_off ? 0 : pm_generic_suspend(dev); | |
578 | } | |
579 | ||
580 | /** | |
581 | * pm_genpd_suspend_noirq - Late suspend of a device from an I/O PM domain. | |
582 | * @dev: Device to suspend. | |
583 | * | |
584 | * Carry out a late suspend of a device under the assumption that its | |
585 | * pm_domain field points to the domain member of an object of type | |
586 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
587 | */ | |
588 | static int pm_genpd_suspend_noirq(struct device *dev) | |
589 | { | |
590 | struct generic_pm_domain *genpd; | |
591 | int ret; | |
592 | ||
593 | dev_dbg(dev, "%s()\n", __func__); | |
594 | ||
595 | genpd = dev_to_genpd(dev); | |
596 | if (IS_ERR(genpd)) | |
597 | return -EINVAL; | |
598 | ||
599 | if (genpd->suspend_power_off) | |
600 | return 0; | |
601 | ||
602 | ret = pm_generic_suspend_noirq(dev); | |
603 | if (ret) | |
604 | return ret; | |
605 | ||
d4f2d87a RW |
606 | if (device_may_wakeup(dev) |
607 | && genpd->active_wakeup && genpd->active_wakeup(dev)) | |
608 | return 0; | |
609 | ||
596ba34b RW |
610 | if (genpd->stop_device) |
611 | genpd->stop_device(dev); | |
612 | ||
613 | /* | |
614 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
615 | * guaranteed that this function will never run twice in parallel for | |
616 | * the same PM domain, so it is not necessary to use locking here. | |
617 | */ | |
618 | genpd->suspended_count++; | |
619 | pm_genpd_sync_poweroff(genpd); | |
620 | ||
621 | return 0; | |
622 | } | |
623 | ||
624 | /** | |
625 | * pm_genpd_resume_noirq - Early resume of a device from an I/O power domain. | |
626 | * @dev: Device to resume. | |
627 | * | |
628 | * Carry out an early resume of a device under the assumption that its | |
629 | * pm_domain field points to the domain member of an object of type | |
630 | * struct generic_pm_domain representing a power domain consisting of I/O | |
631 | * devices. | |
632 | */ | |
633 | static int pm_genpd_resume_noirq(struct device *dev) | |
634 | { | |
635 | struct generic_pm_domain *genpd; | |
636 | ||
637 | dev_dbg(dev, "%s()\n", __func__); | |
638 | ||
639 | genpd = dev_to_genpd(dev); | |
640 | if (IS_ERR(genpd)) | |
641 | return -EINVAL; | |
642 | ||
643 | if (genpd->suspend_power_off) | |
644 | return 0; | |
645 | ||
646 | /* | |
647 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
648 | * guaranteed that this function will never run twice in parallel for | |
649 | * the same PM domain, so it is not necessary to use locking here. | |
650 | */ | |
651 | pm_genpd_poweron(genpd); | |
652 | genpd->suspended_count--; | |
653 | if (genpd->start_device) | |
654 | genpd->start_device(dev); | |
655 | ||
656 | return pm_generic_resume_noirq(dev); | |
657 | } | |
658 | ||
659 | /** | |
660 | * pm_genpd_resume - Resume a device belonging to an I/O power domain. | |
661 | * @dev: Device to resume. | |
662 | * | |
663 | * Resume a device under the assumption that its pm_domain field points to the | |
664 | * domain member of an object of type struct generic_pm_domain representing | |
665 | * a power domain consisting of I/O devices. | |
666 | */ | |
667 | static int pm_genpd_resume(struct device *dev) | |
668 | { | |
669 | struct generic_pm_domain *genpd; | |
670 | ||
671 | dev_dbg(dev, "%s()\n", __func__); | |
672 | ||
673 | genpd = dev_to_genpd(dev); | |
674 | if (IS_ERR(genpd)) | |
675 | return -EINVAL; | |
676 | ||
677 | return genpd->suspend_power_off ? 0 : pm_generic_resume(dev); | |
678 | } | |
679 | ||
680 | /** | |
681 | * pm_genpd_freeze - Freeze a device belonging to an I/O power domain. | |
682 | * @dev: Device to freeze. | |
683 | * | |
684 | * Freeze a device under the assumption that its pm_domain field points to the | |
685 | * domain member of an object of type struct generic_pm_domain representing | |
686 | * a power domain consisting of I/O devices. | |
687 | */ | |
688 | static int pm_genpd_freeze(struct device *dev) | |
689 | { | |
690 | struct generic_pm_domain *genpd; | |
691 | ||
692 | dev_dbg(dev, "%s()\n", __func__); | |
693 | ||
694 | genpd = dev_to_genpd(dev); | |
695 | if (IS_ERR(genpd)) | |
696 | return -EINVAL; | |
697 | ||
698 | return genpd->suspend_power_off ? 0 : pm_generic_freeze(dev); | |
699 | } | |
700 | ||
701 | /** | |
702 | * pm_genpd_freeze_noirq - Late freeze of a device from an I/O power domain. | |
703 | * @dev: Device to freeze. | |
704 | * | |
705 | * Carry out a late freeze of a device under the assumption that its | |
706 | * pm_domain field points to the domain member of an object of type | |
707 | * struct generic_pm_domain representing a power domain consisting of I/O | |
708 | * devices. | |
709 | */ | |
710 | static int pm_genpd_freeze_noirq(struct device *dev) | |
711 | { | |
712 | struct generic_pm_domain *genpd; | |
713 | int ret; | |
714 | ||
715 | dev_dbg(dev, "%s()\n", __func__); | |
716 | ||
717 | genpd = dev_to_genpd(dev); | |
718 | if (IS_ERR(genpd)) | |
719 | return -EINVAL; | |
720 | ||
721 | if (genpd->suspend_power_off) | |
722 | return 0; | |
723 | ||
724 | ret = pm_generic_freeze_noirq(dev); | |
725 | if (ret) | |
726 | return ret; | |
727 | ||
728 | if (genpd->stop_device) | |
729 | genpd->stop_device(dev); | |
730 | ||
731 | return 0; | |
732 | } | |
733 | ||
734 | /** | |
735 | * pm_genpd_thaw_noirq - Early thaw of a device from an I/O power domain. | |
736 | * @dev: Device to thaw. | |
737 | * | |
738 | * Carry out an early thaw of a device under the assumption that its | |
739 | * pm_domain field points to the domain member of an object of type | |
740 | * struct generic_pm_domain representing a power domain consisting of I/O | |
741 | * devices. | |
742 | */ | |
743 | static int pm_genpd_thaw_noirq(struct device *dev) | |
744 | { | |
745 | struct generic_pm_domain *genpd; | |
746 | ||
747 | dev_dbg(dev, "%s()\n", __func__); | |
748 | ||
749 | genpd = dev_to_genpd(dev); | |
750 | if (IS_ERR(genpd)) | |
751 | return -EINVAL; | |
752 | ||
753 | if (genpd->suspend_power_off) | |
754 | return 0; | |
755 | ||
756 | if (genpd->start_device) | |
757 | genpd->start_device(dev); | |
758 | ||
759 | return pm_generic_thaw_noirq(dev); | |
760 | } | |
761 | ||
762 | /** | |
763 | * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. | |
764 | * @dev: Device to thaw. | |
765 | * | |
766 | * Thaw a device under the assumption that its pm_domain field points to the | |
767 | * domain member of an object of type struct generic_pm_domain representing | |
768 | * a power domain consisting of I/O devices. | |
769 | */ | |
770 | static int pm_genpd_thaw(struct device *dev) | |
771 | { | |
772 | struct generic_pm_domain *genpd; | |
773 | ||
774 | dev_dbg(dev, "%s()\n", __func__); | |
775 | ||
776 | genpd = dev_to_genpd(dev); | |
777 | if (IS_ERR(genpd)) | |
778 | return -EINVAL; | |
779 | ||
780 | return genpd->suspend_power_off ? 0 : pm_generic_thaw(dev); | |
781 | } | |
782 | ||
783 | /** | |
784 | * pm_genpd_dev_poweroff - Power off a device belonging to an I/O PM domain. | |
785 | * @dev: Device to suspend. | |
786 | * | |
787 | * Power off a device under the assumption that its pm_domain field points to | |
788 | * the domain member of an object of type struct generic_pm_domain representing | |
789 | * a PM domain consisting of I/O devices. | |
790 | */ | |
791 | static int pm_genpd_dev_poweroff(struct device *dev) | |
792 | { | |
793 | struct generic_pm_domain *genpd; | |
794 | ||
795 | dev_dbg(dev, "%s()\n", __func__); | |
796 | ||
797 | genpd = dev_to_genpd(dev); | |
798 | if (IS_ERR(genpd)) | |
799 | return -EINVAL; | |
800 | ||
801 | return genpd->suspend_power_off ? 0 : pm_generic_poweroff(dev); | |
802 | } | |
803 | ||
804 | /** | |
805 | * pm_genpd_dev_poweroff_noirq - Late power off of a device from a PM domain. | |
806 | * @dev: Device to suspend. | |
807 | * | |
808 | * Carry out a late powering off of a device under the assumption that its | |
809 | * pm_domain field points to the domain member of an object of type | |
810 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
811 | */ | |
812 | static int pm_genpd_dev_poweroff_noirq(struct device *dev) | |
813 | { | |
814 | struct generic_pm_domain *genpd; | |
815 | int ret; | |
816 | ||
817 | dev_dbg(dev, "%s()\n", __func__); | |
818 | ||
819 | genpd = dev_to_genpd(dev); | |
820 | if (IS_ERR(genpd)) | |
821 | return -EINVAL; | |
822 | ||
823 | if (genpd->suspend_power_off) | |
824 | return 0; | |
825 | ||
826 | ret = pm_generic_poweroff_noirq(dev); | |
827 | if (ret) | |
828 | return ret; | |
829 | ||
d4f2d87a RW |
830 | if (device_may_wakeup(dev) |
831 | && genpd->active_wakeup && genpd->active_wakeup(dev)) | |
832 | return 0; | |
833 | ||
596ba34b RW |
834 | if (genpd->stop_device) |
835 | genpd->stop_device(dev); | |
836 | ||
837 | /* | |
838 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
839 | * guaranteed that this function will never run twice in parallel for | |
840 | * the same PM domain, so it is not necessary to use locking here. | |
841 | */ | |
842 | genpd->suspended_count++; | |
843 | pm_genpd_sync_poweroff(genpd); | |
844 | ||
845 | return 0; | |
846 | } | |
847 | ||
848 | /** | |
849 | * pm_genpd_restore_noirq - Early restore of a device from an I/O power domain. | |
850 | * @dev: Device to resume. | |
851 | * | |
852 | * Carry out an early restore of a device under the assumption that its | |
853 | * pm_domain field points to the domain member of an object of type | |
854 | * struct generic_pm_domain representing a power domain consisting of I/O | |
855 | * devices. | |
856 | */ | |
857 | static int pm_genpd_restore_noirq(struct device *dev) | |
858 | { | |
859 | struct generic_pm_domain *genpd; | |
860 | ||
861 | dev_dbg(dev, "%s()\n", __func__); | |
862 | ||
863 | genpd = dev_to_genpd(dev); | |
864 | if (IS_ERR(genpd)) | |
865 | return -EINVAL; | |
866 | ||
867 | /* | |
868 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
869 | * guaranteed that this function will never run twice in parallel for | |
870 | * the same PM domain, so it is not necessary to use locking here. | |
871 | */ | |
17b75eca | 872 | genpd->status = GPD_STATE_POWER_OFF; |
596ba34b RW |
873 | if (genpd->suspend_power_off) { |
874 | /* | |
875 | * The boot kernel might put the domain into the power on state, | |
876 | * so make sure it really is powered off. | |
877 | */ | |
878 | if (genpd->power_off) | |
879 | genpd->power_off(genpd); | |
880 | return 0; | |
881 | } | |
882 | ||
883 | pm_genpd_poweron(genpd); | |
884 | genpd->suspended_count--; | |
885 | if (genpd->start_device) | |
886 | genpd->start_device(dev); | |
887 | ||
888 | return pm_generic_restore_noirq(dev); | |
889 | } | |
890 | ||
891 | /** | |
892 | * pm_genpd_restore - Restore a device belonging to an I/O power domain. | |
893 | * @dev: Device to resume. | |
894 | * | |
895 | * Restore a device under the assumption that its pm_domain field points to the | |
896 | * domain member of an object of type struct generic_pm_domain representing | |
897 | * a power domain consisting of I/O devices. | |
898 | */ | |
899 | static int pm_genpd_restore(struct device *dev) | |
900 | { | |
901 | struct generic_pm_domain *genpd; | |
902 | ||
903 | dev_dbg(dev, "%s()\n", __func__); | |
904 | ||
905 | genpd = dev_to_genpd(dev); | |
906 | if (IS_ERR(genpd)) | |
907 | return -EINVAL; | |
908 | ||
909 | return genpd->suspend_power_off ? 0 : pm_generic_restore(dev); | |
910 | } | |
911 | ||
912 | /** | |
913 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
914 | * @dev: Device to complete the transition of. | |
915 | * | |
916 | * Complete a power transition of a device (during a system-wide power | |
917 | * transition) under the assumption that its pm_domain field points to the | |
918 | * domain member of an object of type struct generic_pm_domain representing | |
919 | * a power domain consisting of I/O devices. | |
920 | */ | |
921 | static void pm_genpd_complete(struct device *dev) | |
922 | { | |
923 | struct generic_pm_domain *genpd; | |
924 | bool run_complete; | |
925 | ||
926 | dev_dbg(dev, "%s()\n", __func__); | |
927 | ||
928 | genpd = dev_to_genpd(dev); | |
929 | if (IS_ERR(genpd)) | |
930 | return; | |
931 | ||
932 | mutex_lock(&genpd->lock); | |
933 | ||
934 | run_complete = !genpd->suspend_power_off; | |
935 | if (--genpd->prepared_count == 0) | |
936 | genpd->suspend_power_off = false; | |
937 | ||
938 | mutex_unlock(&genpd->lock); | |
939 | ||
940 | if (run_complete) { | |
941 | pm_generic_complete(dev); | |
6f00ff78 | 942 | pm_runtime_set_active(dev); |
596ba34b | 943 | pm_runtime_enable(dev); |
6f00ff78 | 944 | pm_runtime_idle(dev); |
596ba34b RW |
945 | } |
946 | } | |
947 | ||
948 | #else | |
949 | ||
950 | #define pm_genpd_prepare NULL | |
951 | #define pm_genpd_suspend NULL | |
952 | #define pm_genpd_suspend_noirq NULL | |
953 | #define pm_genpd_resume_noirq NULL | |
954 | #define pm_genpd_resume NULL | |
955 | #define pm_genpd_freeze NULL | |
956 | #define pm_genpd_freeze_noirq NULL | |
957 | #define pm_genpd_thaw_noirq NULL | |
958 | #define pm_genpd_thaw NULL | |
959 | #define pm_genpd_dev_poweroff_noirq NULL | |
960 | #define pm_genpd_dev_poweroff NULL | |
961 | #define pm_genpd_restore_noirq NULL | |
962 | #define pm_genpd_restore NULL | |
963 | #define pm_genpd_complete NULL | |
964 | ||
965 | #endif /* CONFIG_PM_SLEEP */ | |
966 | ||
f721889f RW |
967 | /** |
968 | * pm_genpd_add_device - Add a device to an I/O PM domain. | |
969 | * @genpd: PM domain to add the device to. | |
970 | * @dev: Device to be added. | |
971 | */ | |
972 | int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev) | |
973 | { | |
974 | struct dev_list_entry *dle; | |
975 | int ret = 0; | |
976 | ||
977 | dev_dbg(dev, "%s()\n", __func__); | |
978 | ||
979 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
980 | return -EINVAL; | |
981 | ||
17b75eca | 982 | genpd_acquire_lock(genpd); |
f721889f | 983 | |
17b75eca | 984 | if (genpd->status == GPD_STATE_POWER_OFF) { |
f721889f RW |
985 | ret = -EINVAL; |
986 | goto out; | |
987 | } | |
988 | ||
596ba34b RW |
989 | if (genpd->prepared_count > 0) { |
990 | ret = -EAGAIN; | |
991 | goto out; | |
992 | } | |
993 | ||
f721889f RW |
994 | list_for_each_entry(dle, &genpd->dev_list, node) |
995 | if (dle->dev == dev) { | |
996 | ret = -EINVAL; | |
997 | goto out; | |
998 | } | |
999 | ||
1000 | dle = kzalloc(sizeof(*dle), GFP_KERNEL); | |
1001 | if (!dle) { | |
1002 | ret = -ENOMEM; | |
1003 | goto out; | |
1004 | } | |
1005 | ||
1006 | dle->dev = dev; | |
1007 | dle->need_restore = false; | |
1008 | list_add_tail(&dle->node, &genpd->dev_list); | |
596ba34b | 1009 | genpd->device_count++; |
f721889f RW |
1010 | |
1011 | spin_lock_irq(&dev->power.lock); | |
1012 | dev->pm_domain = &genpd->domain; | |
1013 | spin_unlock_irq(&dev->power.lock); | |
1014 | ||
1015 | out: | |
17b75eca | 1016 | genpd_release_lock(genpd); |
f721889f RW |
1017 | |
1018 | return ret; | |
1019 | } | |
1020 | ||
1021 | /** | |
1022 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1023 | * @genpd: PM domain to remove the device from. | |
1024 | * @dev: Device to be removed. | |
1025 | */ | |
1026 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1027 | struct device *dev) | |
1028 | { | |
1029 | struct dev_list_entry *dle; | |
1030 | int ret = -EINVAL; | |
1031 | ||
1032 | dev_dbg(dev, "%s()\n", __func__); | |
1033 | ||
1034 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1035 | return -EINVAL; | |
1036 | ||
17b75eca | 1037 | genpd_acquire_lock(genpd); |
f721889f | 1038 | |
596ba34b RW |
1039 | if (genpd->prepared_count > 0) { |
1040 | ret = -EAGAIN; | |
1041 | goto out; | |
1042 | } | |
1043 | ||
f721889f RW |
1044 | list_for_each_entry(dle, &genpd->dev_list, node) { |
1045 | if (dle->dev != dev) | |
1046 | continue; | |
1047 | ||
1048 | spin_lock_irq(&dev->power.lock); | |
1049 | dev->pm_domain = NULL; | |
1050 | spin_unlock_irq(&dev->power.lock); | |
1051 | ||
596ba34b | 1052 | genpd->device_count--; |
f721889f RW |
1053 | list_del(&dle->node); |
1054 | kfree(dle); | |
1055 | ||
1056 | ret = 0; | |
1057 | break; | |
1058 | } | |
1059 | ||
596ba34b | 1060 | out: |
17b75eca | 1061 | genpd_release_lock(genpd); |
f721889f RW |
1062 | |
1063 | return ret; | |
1064 | } | |
1065 | ||
1066 | /** | |
1067 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1068 | * @genpd: Master PM domain to add the subdomain to. | |
1069 | * @new_subdomain: Subdomain to be added. | |
1070 | */ | |
1071 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
1072 | struct generic_pm_domain *new_subdomain) | |
1073 | { | |
1074 | struct generic_pm_domain *subdomain; | |
1075 | int ret = 0; | |
1076 | ||
1077 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(new_subdomain)) | |
1078 | return -EINVAL; | |
1079 | ||
17b75eca RW |
1080 | start: |
1081 | genpd_acquire_lock(genpd); | |
1082 | mutex_lock_nested(&new_subdomain->lock, SINGLE_DEPTH_NESTING); | |
f721889f | 1083 | |
17b75eca RW |
1084 | if (new_subdomain->status != GPD_STATE_POWER_OFF |
1085 | && new_subdomain->status != GPD_STATE_ACTIVE) { | |
1086 | mutex_unlock(&new_subdomain->lock); | |
1087 | genpd_release_lock(genpd); | |
1088 | goto start; | |
1089 | } | |
1090 | ||
1091 | if (genpd->status == GPD_STATE_POWER_OFF | |
1092 | && new_subdomain->status != GPD_STATE_POWER_OFF) { | |
f721889f RW |
1093 | ret = -EINVAL; |
1094 | goto out; | |
1095 | } | |
1096 | ||
1097 | list_for_each_entry(subdomain, &genpd->sd_list, sd_node) { | |
1098 | if (subdomain == new_subdomain) { | |
1099 | ret = -EINVAL; | |
1100 | goto out; | |
1101 | } | |
1102 | } | |
1103 | ||
f721889f RW |
1104 | list_add_tail(&new_subdomain->sd_node, &genpd->sd_list); |
1105 | new_subdomain->parent = genpd; | |
17b75eca | 1106 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1107 | genpd->sd_count++; |
1108 | ||
f721889f | 1109 | out: |
17b75eca RW |
1110 | mutex_unlock(&new_subdomain->lock); |
1111 | genpd_release_lock(genpd); | |
f721889f RW |
1112 | |
1113 | return ret; | |
1114 | } | |
1115 | ||
1116 | /** | |
1117 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1118 | * @genpd: Master PM domain to remove the subdomain from. | |
1119 | * @target: Subdomain to be removed. | |
1120 | */ | |
1121 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
1122 | struct generic_pm_domain *target) | |
1123 | { | |
1124 | struct generic_pm_domain *subdomain; | |
1125 | int ret = -EINVAL; | |
1126 | ||
1127 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(target)) | |
1128 | return -EINVAL; | |
1129 | ||
17b75eca RW |
1130 | start: |
1131 | genpd_acquire_lock(genpd); | |
f721889f RW |
1132 | |
1133 | list_for_each_entry(subdomain, &genpd->sd_list, sd_node) { | |
1134 | if (subdomain != target) | |
1135 | continue; | |
1136 | ||
1137 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); | |
1138 | ||
17b75eca RW |
1139 | if (subdomain->status != GPD_STATE_POWER_OFF |
1140 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1141 | mutex_unlock(&subdomain->lock); | |
1142 | genpd_release_lock(genpd); | |
1143 | goto start; | |
1144 | } | |
1145 | ||
f721889f RW |
1146 | list_del(&subdomain->sd_node); |
1147 | subdomain->parent = NULL; | |
17b75eca | 1148 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1149 | genpd_sd_counter_dec(genpd); |
1150 | ||
1151 | mutex_unlock(&subdomain->lock); | |
1152 | ||
1153 | ret = 0; | |
1154 | break; | |
1155 | } | |
1156 | ||
17b75eca | 1157 | genpd_release_lock(genpd); |
f721889f RW |
1158 | |
1159 | return ret; | |
1160 | } | |
1161 | ||
1162 | /** | |
1163 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1164 | * @genpd: PM domain object to initialize. | |
1165 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1166 | * @is_off: Initial value of the domain's power_is_off field. | |
1167 | */ | |
1168 | void pm_genpd_init(struct generic_pm_domain *genpd, | |
1169 | struct dev_power_governor *gov, bool is_off) | |
1170 | { | |
1171 | if (IS_ERR_OR_NULL(genpd)) | |
1172 | return; | |
1173 | ||
1174 | INIT_LIST_HEAD(&genpd->sd_node); | |
1175 | genpd->parent = NULL; | |
1176 | INIT_LIST_HEAD(&genpd->dev_list); | |
1177 | INIT_LIST_HEAD(&genpd->sd_list); | |
1178 | mutex_init(&genpd->lock); | |
1179 | genpd->gov = gov; | |
1180 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
1181 | genpd->in_progress = 0; | |
1182 | genpd->sd_count = 0; | |
17b75eca RW |
1183 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
1184 | init_waitqueue_head(&genpd->status_wait_queue); | |
c6d22b37 RW |
1185 | genpd->poweroff_task = NULL; |
1186 | genpd->resume_count = 0; | |
596ba34b RW |
1187 | genpd->device_count = 0; |
1188 | genpd->suspended_count = 0; | |
f721889f RW |
1189 | genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; |
1190 | genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; | |
1191 | genpd->domain.ops.runtime_idle = pm_generic_runtime_idle; | |
596ba34b RW |
1192 | genpd->domain.ops.prepare = pm_genpd_prepare; |
1193 | genpd->domain.ops.suspend = pm_genpd_suspend; | |
1194 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; | |
1195 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; | |
1196 | genpd->domain.ops.resume = pm_genpd_resume; | |
1197 | genpd->domain.ops.freeze = pm_genpd_freeze; | |
1198 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; | |
1199 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; | |
1200 | genpd->domain.ops.thaw = pm_genpd_thaw; | |
1201 | genpd->domain.ops.poweroff = pm_genpd_dev_poweroff; | |
1202 | genpd->domain.ops.poweroff_noirq = pm_genpd_dev_poweroff_noirq; | |
1203 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; | |
1204 | genpd->domain.ops.restore = pm_genpd_restore; | |
1205 | genpd->domain.ops.complete = pm_genpd_complete; | |
f721889f | 1206 | } |