Commit | Line | Data |
---|---|---|
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> | |
d5e4cbfe RW |
18 | #include <linux/export.h> |
19 | ||
20 | #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \ | |
21 | ({ \ | |
22 | type (*__routine)(struct device *__d); \ | |
23 | type __ret = (type)0; \ | |
24 | \ | |
25 | __routine = genpd->dev_ops.callback; \ | |
26 | if (__routine) { \ | |
27 | __ret = __routine(dev); \ | |
28 | } else { \ | |
29 | __routine = dev_gpd_data(dev)->ops.callback; \ | |
30 | if (__routine) \ | |
31 | __ret = __routine(dev); \ | |
32 | } \ | |
33 | __ret; \ | |
34 | }) | |
f721889f | 35 | |
0140d8bd RW |
36 | #define GENPD_DEV_TIMED_CALLBACK(genpd, type, callback, dev, field, name) \ |
37 | ({ \ | |
38 | ktime_t __start = ktime_get(); \ | |
39 | type __retval = GENPD_DEV_CALLBACK(genpd, type, callback, dev); \ | |
40 | s64 __elapsed = ktime_to_ns(ktime_sub(ktime_get(), __start)); \ | |
41 | struct generic_pm_domain_data *__gpd_data = dev_gpd_data(dev); \ | |
42 | if (__elapsed > __gpd_data->td.field) { \ | |
43 | __gpd_data->td.field = __elapsed; \ | |
44 | dev_warn(dev, name " latency exceeded, new value %lld ns\n", \ | |
45 | __elapsed); \ | |
46 | } \ | |
47 | __retval; \ | |
48 | }) | |
49 | ||
5125bbf3 RW |
50 | static LIST_HEAD(gpd_list); |
51 | static DEFINE_MUTEX(gpd_list_lock); | |
52 | ||
5248051b RW |
53 | #ifdef CONFIG_PM |
54 | ||
b02c999a | 55 | struct generic_pm_domain *dev_to_genpd(struct device *dev) |
5248051b RW |
56 | { |
57 | if (IS_ERR_OR_NULL(dev->pm_domain)) | |
58 | return ERR_PTR(-EINVAL); | |
59 | ||
596ba34b | 60 | return pd_to_genpd(dev->pm_domain); |
5248051b | 61 | } |
f721889f | 62 | |
d5e4cbfe RW |
63 | static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev) |
64 | { | |
0140d8bd RW |
65 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, stop, dev, |
66 | stop_latency_ns, "stop"); | |
d5e4cbfe RW |
67 | } |
68 | ||
69 | static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev) | |
70 | { | |
0140d8bd RW |
71 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, start, dev, |
72 | start_latency_ns, "start"); | |
d5e4cbfe RW |
73 | } |
74 | ||
ecf00475 RW |
75 | static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev) |
76 | { | |
0140d8bd RW |
77 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, save_state, dev, |
78 | save_state_latency_ns, "state save"); | |
ecf00475 RW |
79 | } |
80 | ||
81 | static int genpd_restore_dev(struct generic_pm_domain *genpd, struct device *dev) | |
82 | { | |
0140d8bd RW |
83 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, restore_state, dev, |
84 | restore_state_latency_ns, | |
85 | "state restore"); | |
ecf00475 RW |
86 | } |
87 | ||
c4bb3160 | 88 | static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
f721889f | 89 | { |
c4bb3160 RW |
90 | bool ret = false; |
91 | ||
92 | if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) | |
93 | ret = !!atomic_dec_and_test(&genpd->sd_count); | |
94 | ||
95 | return ret; | |
96 | } | |
97 | ||
98 | static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) | |
99 | { | |
100 | atomic_inc(&genpd->sd_count); | |
101 | smp_mb__after_atomic_inc(); | |
f721889f RW |
102 | } |
103 | ||
17b75eca RW |
104 | static void genpd_acquire_lock(struct generic_pm_domain *genpd) |
105 | { | |
106 | DEFINE_WAIT(wait); | |
107 | ||
108 | mutex_lock(&genpd->lock); | |
109 | /* | |
110 | * Wait for the domain to transition into either the active, | |
111 | * or the power off state. | |
112 | */ | |
113 | for (;;) { | |
114 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
115 | TASK_UNINTERRUPTIBLE); | |
c6d22b37 RW |
116 | if (genpd->status == GPD_STATE_ACTIVE |
117 | || genpd->status == GPD_STATE_POWER_OFF) | |
17b75eca RW |
118 | break; |
119 | mutex_unlock(&genpd->lock); | |
120 | ||
121 | schedule(); | |
122 | ||
123 | mutex_lock(&genpd->lock); | |
124 | } | |
125 | finish_wait(&genpd->status_wait_queue, &wait); | |
126 | } | |
127 | ||
128 | static void genpd_release_lock(struct generic_pm_domain *genpd) | |
129 | { | |
130 | mutex_unlock(&genpd->lock); | |
131 | } | |
132 | ||
c6d22b37 RW |
133 | static void genpd_set_active(struct generic_pm_domain *genpd) |
134 | { | |
135 | if (genpd->resume_count == 0) | |
136 | genpd->status = GPD_STATE_ACTIVE; | |
137 | } | |
138 | ||
5248051b | 139 | /** |
5063ce15 | 140 | * __pm_genpd_poweron - Restore power to a given PM domain and its masters. |
5248051b RW |
141 | * @genpd: PM domain to power up. |
142 | * | |
5063ce15 | 143 | * Restore power to @genpd and all of its masters so that it is possible to |
5248051b RW |
144 | * resume a device belonging to it. |
145 | */ | |
3f241775 RW |
146 | int __pm_genpd_poweron(struct generic_pm_domain *genpd) |
147 | __releases(&genpd->lock) __acquires(&genpd->lock) | |
5248051b | 148 | { |
5063ce15 | 149 | struct gpd_link *link; |
3f241775 | 150 | DEFINE_WAIT(wait); |
5248051b RW |
151 | int ret = 0; |
152 | ||
5063ce15 | 153 | /* If the domain's master is being waited for, we have to wait too. */ |
3f241775 RW |
154 | for (;;) { |
155 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
156 | TASK_UNINTERRUPTIBLE); | |
17877eb5 | 157 | if (genpd->status != GPD_STATE_WAIT_MASTER) |
3f241775 RW |
158 | break; |
159 | mutex_unlock(&genpd->lock); | |
17b75eca | 160 | |
3f241775 RW |
161 | schedule(); |
162 | ||
163 | mutex_lock(&genpd->lock); | |
164 | } | |
165 | finish_wait(&genpd->status_wait_queue, &wait); | |
9e08cf42 | 166 | |
17b75eca | 167 | if (genpd->status == GPD_STATE_ACTIVE |
596ba34b | 168 | || (genpd->prepared_count > 0 && genpd->suspend_power_off)) |
3f241775 | 169 | return 0; |
5248051b | 170 | |
c6d22b37 RW |
171 | if (genpd->status != GPD_STATE_POWER_OFF) { |
172 | genpd_set_active(genpd); | |
3f241775 | 173 | return 0; |
c6d22b37 RW |
174 | } |
175 | ||
5063ce15 RW |
176 | /* |
177 | * The list is guaranteed not to change while the loop below is being | |
178 | * executed, unless one of the masters' .power_on() callbacks fiddles | |
179 | * with it. | |
180 | */ | |
181 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
182 | genpd_sd_counter_inc(link->master); | |
17877eb5 | 183 | genpd->status = GPD_STATE_WAIT_MASTER; |
3c07cbc4 | 184 | |
5248051b | 185 | mutex_unlock(&genpd->lock); |
5248051b | 186 | |
5063ce15 | 187 | ret = pm_genpd_poweron(link->master); |
9e08cf42 RW |
188 | |
189 | mutex_lock(&genpd->lock); | |
190 | ||
3f241775 RW |
191 | /* |
192 | * The "wait for parent" status is guaranteed not to change | |
5063ce15 | 193 | * while the master is powering on. |
3f241775 RW |
194 | */ |
195 | genpd->status = GPD_STATE_POWER_OFF; | |
196 | wake_up_all(&genpd->status_wait_queue); | |
5063ce15 RW |
197 | if (ret) { |
198 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 199 | goto err; |
5063ce15 | 200 | } |
5248051b RW |
201 | } |
202 | ||
9e08cf42 | 203 | if (genpd->power_on) { |
0140d8bd RW |
204 | ktime_t time_start = ktime_get(); |
205 | s64 elapsed_ns; | |
206 | ||
fe202fde | 207 | ret = genpd->power_on(genpd); |
9e08cf42 RW |
208 | if (ret) |
209 | goto err; | |
0140d8bd RW |
210 | |
211 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
212 | if (elapsed_ns > genpd->power_on_latency_ns) | |
213 | genpd->power_on_latency_ns = elapsed_ns; | |
3c07cbc4 | 214 | } |
5248051b | 215 | |
9e08cf42 RW |
216 | genpd_set_active(genpd); |
217 | ||
3f241775 | 218 | return 0; |
9e08cf42 RW |
219 | |
220 | err: | |
5063ce15 RW |
221 | list_for_each_entry_continue_reverse(link, &genpd->slave_links, slave_node) |
222 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 223 | |
3f241775 RW |
224 | return ret; |
225 | } | |
226 | ||
227 | /** | |
5063ce15 | 228 | * pm_genpd_poweron - Restore power to a given PM domain and its masters. |
3f241775 RW |
229 | * @genpd: PM domain to power up. |
230 | */ | |
231 | int pm_genpd_poweron(struct generic_pm_domain *genpd) | |
232 | { | |
233 | int ret; | |
234 | ||
235 | mutex_lock(&genpd->lock); | |
236 | ret = __pm_genpd_poweron(genpd); | |
237 | mutex_unlock(&genpd->lock); | |
238 | return ret; | |
5248051b RW |
239 | } |
240 | ||
241 | #endif /* CONFIG_PM */ | |
242 | ||
243 | #ifdef CONFIG_PM_RUNTIME | |
244 | ||
f721889f RW |
245 | /** |
246 | * __pm_genpd_save_device - Save the pre-suspend state of a device. | |
4605ab65 | 247 | * @pdd: Domain data of the device to save the state of. |
f721889f RW |
248 | * @genpd: PM domain the device belongs to. |
249 | */ | |
4605ab65 | 250 | static int __pm_genpd_save_device(struct pm_domain_data *pdd, |
f721889f | 251 | struct generic_pm_domain *genpd) |
17b75eca | 252 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 253 | { |
cd0ea672 | 254 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
4605ab65 | 255 | struct device *dev = pdd->dev; |
f721889f RW |
256 | int ret = 0; |
257 | ||
cd0ea672 | 258 | if (gpd_data->need_restore) |
f721889f RW |
259 | return 0; |
260 | ||
17b75eca RW |
261 | mutex_unlock(&genpd->lock); |
262 | ||
ecf00475 RW |
263 | genpd_start_dev(genpd, dev); |
264 | ret = genpd_save_dev(genpd, dev); | |
265 | genpd_stop_dev(genpd, dev); | |
f721889f | 266 | |
17b75eca RW |
267 | mutex_lock(&genpd->lock); |
268 | ||
f721889f | 269 | if (!ret) |
cd0ea672 | 270 | gpd_data->need_restore = true; |
f721889f RW |
271 | |
272 | return ret; | |
273 | } | |
274 | ||
275 | /** | |
276 | * __pm_genpd_restore_device - Restore the pre-suspend state of a device. | |
4605ab65 | 277 | * @pdd: Domain data of the device to restore the state of. |
f721889f RW |
278 | * @genpd: PM domain the device belongs to. |
279 | */ | |
4605ab65 | 280 | static void __pm_genpd_restore_device(struct pm_domain_data *pdd, |
f721889f | 281 | struct generic_pm_domain *genpd) |
17b75eca | 282 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 283 | { |
cd0ea672 | 284 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
4605ab65 | 285 | struct device *dev = pdd->dev; |
f721889f | 286 | |
cd0ea672 | 287 | if (!gpd_data->need_restore) |
f721889f RW |
288 | return; |
289 | ||
17b75eca RW |
290 | mutex_unlock(&genpd->lock); |
291 | ||
ecf00475 RW |
292 | genpd_start_dev(genpd, dev); |
293 | genpd_restore_dev(genpd, dev); | |
294 | genpd_stop_dev(genpd, dev); | |
f721889f | 295 | |
17b75eca RW |
296 | mutex_lock(&genpd->lock); |
297 | ||
cd0ea672 | 298 | gpd_data->need_restore = false; |
f721889f RW |
299 | } |
300 | ||
c6d22b37 RW |
301 | /** |
302 | * genpd_abort_poweroff - Check if a PM domain power off should be aborted. | |
303 | * @genpd: PM domain to check. | |
304 | * | |
305 | * Return true if a PM domain's status changed to GPD_STATE_ACTIVE during | |
306 | * a "power off" operation, which means that a "power on" has occured in the | |
307 | * meantime, or if its resume_count field is different from zero, which means | |
308 | * that one of its devices has been resumed in the meantime. | |
309 | */ | |
310 | static bool genpd_abort_poweroff(struct generic_pm_domain *genpd) | |
311 | { | |
17877eb5 | 312 | return genpd->status == GPD_STATE_WAIT_MASTER |
3f241775 | 313 | || genpd->status == GPD_STATE_ACTIVE || genpd->resume_count > 0; |
c6d22b37 RW |
314 | } |
315 | ||
56375fd4 RW |
316 | /** |
317 | * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff(). | |
318 | * @genpd: PM domait to power off. | |
319 | * | |
320 | * Queue up the execution of pm_genpd_poweroff() unless it's already been done | |
321 | * before. | |
322 | */ | |
0bc5b2de | 323 | void genpd_queue_power_off_work(struct generic_pm_domain *genpd) |
56375fd4 RW |
324 | { |
325 | if (!work_pending(&genpd->power_off_work)) | |
326 | queue_work(pm_wq, &genpd->power_off_work); | |
327 | } | |
328 | ||
f721889f RW |
329 | /** |
330 | * pm_genpd_poweroff - Remove power from a given PM domain. | |
331 | * @genpd: PM domain to power down. | |
332 | * | |
333 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
334 | * have been powered down, run the runtime suspend callbacks provided by all of | |
335 | * the @genpd's devices' drivers and remove power from @genpd. | |
336 | */ | |
337 | static int pm_genpd_poweroff(struct generic_pm_domain *genpd) | |
17b75eca | 338 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 339 | { |
4605ab65 | 340 | struct pm_domain_data *pdd; |
5063ce15 | 341 | struct gpd_link *link; |
f721889f | 342 | unsigned int not_suspended; |
c6d22b37 | 343 | int ret = 0; |
f721889f | 344 | |
c6d22b37 RW |
345 | start: |
346 | /* | |
347 | * Do not try to power off the domain in the following situations: | |
348 | * (1) The domain is already in the "power off" state. | |
5063ce15 | 349 | * (2) The domain is waiting for its master to power up. |
c6d22b37 | 350 | * (3) One of the domain's devices is being resumed right now. |
3f241775 | 351 | * (4) System suspend is in progress. |
c6d22b37 | 352 | */ |
3f241775 | 353 | if (genpd->status == GPD_STATE_POWER_OFF |
17877eb5 | 354 | || genpd->status == GPD_STATE_WAIT_MASTER |
3f241775 | 355 | || genpd->resume_count > 0 || genpd->prepared_count > 0) |
f721889f RW |
356 | return 0; |
357 | ||
c4bb3160 | 358 | if (atomic_read(&genpd->sd_count) > 0) |
f721889f RW |
359 | return -EBUSY; |
360 | ||
361 | not_suspended = 0; | |
4605ab65 | 362 | list_for_each_entry(pdd, &genpd->dev_list, list_node) |
0aa2a221 RW |
363 | if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev) |
364 | || pdd->dev->power.irq_safe)) | |
f721889f RW |
365 | not_suspended++; |
366 | ||
367 | if (not_suspended > genpd->in_progress) | |
368 | return -EBUSY; | |
369 | ||
c6d22b37 RW |
370 | if (genpd->poweroff_task) { |
371 | /* | |
372 | * Another instance of pm_genpd_poweroff() is executing | |
373 | * callbacks, so tell it to start over and return. | |
374 | */ | |
375 | genpd->status = GPD_STATE_REPEAT; | |
376 | return 0; | |
377 | } | |
378 | ||
f721889f RW |
379 | if (genpd->gov && genpd->gov->power_down_ok) { |
380 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
381 | return -EAGAIN; | |
382 | } | |
383 | ||
17b75eca | 384 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 | 385 | genpd->poweroff_task = current; |
17b75eca | 386 | |
4605ab65 | 387 | list_for_each_entry_reverse(pdd, &genpd->dev_list, list_node) { |
3c07cbc4 | 388 | ret = atomic_read(&genpd->sd_count) == 0 ? |
4605ab65 | 389 | __pm_genpd_save_device(pdd, genpd) : -EBUSY; |
3f241775 RW |
390 | |
391 | if (genpd_abort_poweroff(genpd)) | |
392 | goto out; | |
393 | ||
697a7f37 RW |
394 | if (ret) { |
395 | genpd_set_active(genpd); | |
396 | goto out; | |
397 | } | |
f721889f | 398 | |
c6d22b37 RW |
399 | if (genpd->status == GPD_STATE_REPEAT) { |
400 | genpd->poweroff_task = NULL; | |
401 | goto start; | |
402 | } | |
403 | } | |
17b75eca | 404 | |
3c07cbc4 | 405 | if (genpd->power_off) { |
0140d8bd RW |
406 | ktime_t time_start; |
407 | s64 elapsed_ns; | |
408 | ||
3c07cbc4 RW |
409 | if (atomic_read(&genpd->sd_count) > 0) { |
410 | ret = -EBUSY; | |
c6d22b37 RW |
411 | goto out; |
412 | } | |
17b75eca | 413 | |
0140d8bd RW |
414 | time_start = ktime_get(); |
415 | ||
3c07cbc4 | 416 | /* |
5063ce15 RW |
417 | * If sd_count > 0 at this point, one of the subdomains hasn't |
418 | * managed to call pm_genpd_poweron() for the master yet after | |
3c07cbc4 RW |
419 | * incrementing it. In that case pm_genpd_poweron() will wait |
420 | * for us to drop the lock, so we can call .power_off() and let | |
421 | * the pm_genpd_poweron() restore power for us (this shouldn't | |
422 | * happen very often). | |
423 | */ | |
d2805402 RW |
424 | ret = genpd->power_off(genpd); |
425 | if (ret == -EBUSY) { | |
426 | genpd_set_active(genpd); | |
d2805402 RW |
427 | goto out; |
428 | } | |
0140d8bd RW |
429 | |
430 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
431 | if (elapsed_ns > genpd->power_off_latency_ns) | |
432 | genpd->power_off_latency_ns = elapsed_ns; | |
d2805402 | 433 | } |
f721889f | 434 | |
17b75eca | 435 | genpd->status = GPD_STATE_POWER_OFF; |
221e9b58 RW |
436 | genpd->power_off_time = ktime_get(); |
437 | ||
438 | /* Update PM QoS information for devices in the domain. */ | |
439 | list_for_each_entry_reverse(pdd, &genpd->dev_list, list_node) { | |
440 | struct gpd_timing_data *td = &to_gpd_data(pdd)->td; | |
441 | ||
442 | pm_runtime_update_max_time_suspended(pdd->dev, | |
443 | td->start_latency_ns + | |
444 | td->restore_state_latency_ns + | |
445 | genpd->power_on_latency_ns); | |
446 | } | |
f721889f | 447 | |
5063ce15 RW |
448 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
449 | genpd_sd_counter_dec(link->master); | |
450 | genpd_queue_power_off_work(link->master); | |
451 | } | |
f721889f | 452 | |
c6d22b37 RW |
453 | out: |
454 | genpd->poweroff_task = NULL; | |
455 | wake_up_all(&genpd->status_wait_queue); | |
456 | return ret; | |
f721889f RW |
457 | } |
458 | ||
459 | /** | |
460 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
461 | * @work: Work structure used for scheduling the execution of this function. | |
462 | */ | |
463 | static void genpd_power_off_work_fn(struct work_struct *work) | |
464 | { | |
465 | struct generic_pm_domain *genpd; | |
466 | ||
467 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
468 | ||
17b75eca | 469 | genpd_acquire_lock(genpd); |
f721889f | 470 | pm_genpd_poweroff(genpd); |
17b75eca | 471 | genpd_release_lock(genpd); |
f721889f RW |
472 | } |
473 | ||
474 | /** | |
475 | * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. | |
476 | * @dev: Device to suspend. | |
477 | * | |
478 | * Carry out a runtime suspend of a device under the assumption that its | |
479 | * pm_domain field points to the domain member of an object of type | |
480 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
481 | */ | |
482 | static int pm_genpd_runtime_suspend(struct device *dev) | |
483 | { | |
484 | struct generic_pm_domain *genpd; | |
b02c999a | 485 | bool (*stop_ok)(struct device *__dev); |
d5e4cbfe | 486 | int ret; |
f721889f RW |
487 | |
488 | dev_dbg(dev, "%s()\n", __func__); | |
489 | ||
5248051b RW |
490 | genpd = dev_to_genpd(dev); |
491 | if (IS_ERR(genpd)) | |
f721889f RW |
492 | return -EINVAL; |
493 | ||
0aa2a221 RW |
494 | might_sleep_if(!genpd->dev_irq_safe); |
495 | ||
b02c999a RW |
496 | stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL; |
497 | if (stop_ok && !stop_ok(dev)) | |
498 | return -EBUSY; | |
499 | ||
d5e4cbfe RW |
500 | ret = genpd_stop_dev(genpd, dev); |
501 | if (ret) | |
502 | return ret; | |
17b75eca | 503 | |
b02c999a RW |
504 | pm_runtime_update_max_time_suspended(dev, |
505 | dev_gpd_data(dev)->td.start_latency_ns); | |
506 | ||
0aa2a221 RW |
507 | /* |
508 | * If power.irq_safe is set, this routine will be run with interrupts | |
509 | * off, so it can't use mutexes. | |
510 | */ | |
511 | if (dev->power.irq_safe) | |
512 | return 0; | |
513 | ||
c6d22b37 | 514 | mutex_lock(&genpd->lock); |
f721889f RW |
515 | genpd->in_progress++; |
516 | pm_genpd_poweroff(genpd); | |
517 | genpd->in_progress--; | |
c6d22b37 | 518 | mutex_unlock(&genpd->lock); |
f721889f RW |
519 | |
520 | return 0; | |
521 | } | |
522 | ||
f721889f RW |
523 | /** |
524 | * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
525 | * @dev: Device to resume. | |
526 | * | |
527 | * Carry out a runtime resume of a device under the assumption that its | |
528 | * pm_domain field points to the domain member of an object of type | |
529 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
530 | */ | |
531 | static int pm_genpd_runtime_resume(struct device *dev) | |
532 | { | |
533 | struct generic_pm_domain *genpd; | |
c6d22b37 | 534 | DEFINE_WAIT(wait); |
f721889f RW |
535 | int ret; |
536 | ||
537 | dev_dbg(dev, "%s()\n", __func__); | |
538 | ||
5248051b RW |
539 | genpd = dev_to_genpd(dev); |
540 | if (IS_ERR(genpd)) | |
f721889f RW |
541 | return -EINVAL; |
542 | ||
0aa2a221 RW |
543 | might_sleep_if(!genpd->dev_irq_safe); |
544 | ||
545 | /* If power.irq_safe, the PM domain is never powered off. */ | |
546 | if (dev->power.irq_safe) | |
547 | goto out; | |
548 | ||
c6d22b37 | 549 | mutex_lock(&genpd->lock); |
3f241775 RW |
550 | ret = __pm_genpd_poweron(genpd); |
551 | if (ret) { | |
552 | mutex_unlock(&genpd->lock); | |
553 | return ret; | |
554 | } | |
17b75eca | 555 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 RW |
556 | genpd->resume_count++; |
557 | for (;;) { | |
558 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
559 | TASK_UNINTERRUPTIBLE); | |
560 | /* | |
561 | * If current is the powering off task, we have been called | |
562 | * reentrantly from one of the device callbacks, so we should | |
563 | * not wait. | |
564 | */ | |
565 | if (!genpd->poweroff_task || genpd->poweroff_task == current) | |
566 | break; | |
567 | mutex_unlock(&genpd->lock); | |
568 | ||
569 | schedule(); | |
570 | ||
571 | mutex_lock(&genpd->lock); | |
572 | } | |
573 | finish_wait(&genpd->status_wait_queue, &wait); | |
cd0ea672 | 574 | __pm_genpd_restore_device(dev->power.subsys_data->domain_data, genpd); |
c6d22b37 RW |
575 | genpd->resume_count--; |
576 | genpd_set_active(genpd); | |
17b75eca | 577 | wake_up_all(&genpd->status_wait_queue); |
c6d22b37 | 578 | mutex_unlock(&genpd->lock); |
17b75eca | 579 | |
0aa2a221 | 580 | out: |
d5e4cbfe | 581 | genpd_start_dev(genpd, dev); |
f721889f RW |
582 | |
583 | return 0; | |
584 | } | |
585 | ||
17f2ae7f RW |
586 | /** |
587 | * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use. | |
588 | */ | |
589 | void pm_genpd_poweroff_unused(void) | |
590 | { | |
591 | struct generic_pm_domain *genpd; | |
592 | ||
593 | mutex_lock(&gpd_list_lock); | |
594 | ||
595 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
596 | genpd_queue_power_off_work(genpd); | |
597 | ||
598 | mutex_unlock(&gpd_list_lock); | |
599 | } | |
600 | ||
f721889f RW |
601 | #else |
602 | ||
603 | static inline void genpd_power_off_work_fn(struct work_struct *work) {} | |
604 | ||
605 | #define pm_genpd_runtime_suspend NULL | |
606 | #define pm_genpd_runtime_resume NULL | |
607 | ||
608 | #endif /* CONFIG_PM_RUNTIME */ | |
609 | ||
596ba34b RW |
610 | #ifdef CONFIG_PM_SLEEP |
611 | ||
d5e4cbfe RW |
612 | static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd, |
613 | struct device *dev) | |
614 | { | |
615 | return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev); | |
616 | } | |
617 | ||
d23b9b00 RW |
618 | static int genpd_suspend_dev(struct generic_pm_domain *genpd, struct device *dev) |
619 | { | |
620 | return GENPD_DEV_CALLBACK(genpd, int, suspend, dev); | |
621 | } | |
622 | ||
623 | static int genpd_suspend_late(struct generic_pm_domain *genpd, struct device *dev) | |
624 | { | |
625 | return GENPD_DEV_CALLBACK(genpd, int, suspend_late, dev); | |
626 | } | |
627 | ||
628 | static int genpd_resume_early(struct generic_pm_domain *genpd, struct device *dev) | |
629 | { | |
630 | return GENPD_DEV_CALLBACK(genpd, int, resume_early, dev); | |
631 | } | |
632 | ||
633 | static int genpd_resume_dev(struct generic_pm_domain *genpd, struct device *dev) | |
634 | { | |
635 | return GENPD_DEV_CALLBACK(genpd, int, resume, dev); | |
636 | } | |
637 | ||
638 | static int genpd_freeze_dev(struct generic_pm_domain *genpd, struct device *dev) | |
639 | { | |
640 | return GENPD_DEV_CALLBACK(genpd, int, freeze, dev); | |
641 | } | |
642 | ||
643 | static int genpd_freeze_late(struct generic_pm_domain *genpd, struct device *dev) | |
644 | { | |
645 | return GENPD_DEV_CALLBACK(genpd, int, freeze_late, dev); | |
646 | } | |
647 | ||
648 | static int genpd_thaw_early(struct generic_pm_domain *genpd, struct device *dev) | |
649 | { | |
650 | return GENPD_DEV_CALLBACK(genpd, int, thaw_early, dev); | |
651 | } | |
652 | ||
653 | static int genpd_thaw_dev(struct generic_pm_domain *genpd, struct device *dev) | |
654 | { | |
655 | return GENPD_DEV_CALLBACK(genpd, int, thaw, dev); | |
656 | } | |
657 | ||
596ba34b | 658 | /** |
5063ce15 | 659 | * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters. |
596ba34b RW |
660 | * @genpd: PM domain to power off, if possible. |
661 | * | |
662 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 663 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b RW |
664 | * |
665 | * This function is only called in "noirq" stages of system power transitions, | |
666 | * so it need not acquire locks (all of the "noirq" callbacks are executed | |
667 | * sequentially, so it is guaranteed that it will never run twice in parallel). | |
668 | */ | |
669 | static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd) | |
670 | { | |
5063ce15 | 671 | struct gpd_link *link; |
596ba34b | 672 | |
17b75eca | 673 | if (genpd->status == GPD_STATE_POWER_OFF) |
596ba34b RW |
674 | return; |
675 | ||
c4bb3160 RW |
676 | if (genpd->suspended_count != genpd->device_count |
677 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
678 | return; |
679 | ||
680 | if (genpd->power_off) | |
681 | genpd->power_off(genpd); | |
682 | ||
17b75eca | 683 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
684 | |
685 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
686 | genpd_sd_counter_dec(link->master); | |
687 | pm_genpd_sync_poweroff(link->master); | |
596ba34b RW |
688 | } |
689 | } | |
690 | ||
4ecd6e65 RW |
691 | /** |
692 | * resume_needed - Check whether to resume a device before system suspend. | |
693 | * @dev: Device to check. | |
694 | * @genpd: PM domain the device belongs to. | |
695 | * | |
696 | * There are two cases in which a device that can wake up the system from sleep | |
697 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled | |
698 | * to wake up the system and it has to remain active for this purpose while the | |
699 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
700 | * the system from sleep states and it generally doesn't generate wakeup signals | |
701 | * by itself (those signals are generated on its behalf by other parts of the | |
702 | * system). In the latter case it may be necessary to reconfigure the device's | |
703 | * wakeup settings during system suspend, because it may have been set up to | |
704 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
705 | * Return 'true' in either of the above cases. | |
706 | */ | |
707 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) | |
708 | { | |
709 | bool active_wakeup; | |
710 | ||
711 | if (!device_can_wakeup(dev)) | |
712 | return false; | |
713 | ||
d5e4cbfe | 714 | active_wakeup = genpd_dev_active_wakeup(genpd, dev); |
4ecd6e65 RW |
715 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
716 | } | |
717 | ||
596ba34b RW |
718 | /** |
719 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
720 | * @dev: Device to start the transition of. | |
721 | * | |
722 | * Start a power transition of a device (during a system-wide power transition) | |
723 | * under the assumption that its pm_domain field points to the domain member of | |
724 | * an object of type struct generic_pm_domain representing a PM domain | |
725 | * consisting of I/O devices. | |
726 | */ | |
727 | static int pm_genpd_prepare(struct device *dev) | |
728 | { | |
729 | struct generic_pm_domain *genpd; | |
b6c10c84 | 730 | int ret; |
596ba34b RW |
731 | |
732 | dev_dbg(dev, "%s()\n", __func__); | |
733 | ||
734 | genpd = dev_to_genpd(dev); | |
735 | if (IS_ERR(genpd)) | |
736 | return -EINVAL; | |
737 | ||
17b75eca RW |
738 | /* |
739 | * If a wakeup request is pending for the device, it should be woken up | |
740 | * at this point and a system wakeup event should be reported if it's | |
741 | * set up to wake up the system from sleep states. | |
742 | */ | |
743 | pm_runtime_get_noresume(dev); | |
744 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) | |
745 | pm_wakeup_event(dev, 0); | |
746 | ||
747 | if (pm_wakeup_pending()) { | |
748 | pm_runtime_put_sync(dev); | |
749 | return -EBUSY; | |
750 | } | |
751 | ||
4ecd6e65 RW |
752 | if (resume_needed(dev, genpd)) |
753 | pm_runtime_resume(dev); | |
754 | ||
17b75eca | 755 | genpd_acquire_lock(genpd); |
596ba34b RW |
756 | |
757 | if (genpd->prepared_count++ == 0) | |
17b75eca RW |
758 | genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; |
759 | ||
760 | genpd_release_lock(genpd); | |
596ba34b RW |
761 | |
762 | if (genpd->suspend_power_off) { | |
17b75eca | 763 | pm_runtime_put_noidle(dev); |
596ba34b RW |
764 | return 0; |
765 | } | |
766 | ||
767 | /* | |
17b75eca RW |
768 | * The PM domain must be in the GPD_STATE_ACTIVE state at this point, |
769 | * so pm_genpd_poweron() will return immediately, but if the device | |
d5e4cbfe | 770 | * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need |
17b75eca | 771 | * to make it operational. |
596ba34b | 772 | */ |
17b75eca | 773 | pm_runtime_resume(dev); |
596ba34b RW |
774 | __pm_runtime_disable(dev, false); |
775 | ||
b6c10c84 RW |
776 | ret = pm_generic_prepare(dev); |
777 | if (ret) { | |
778 | mutex_lock(&genpd->lock); | |
779 | ||
780 | if (--genpd->prepared_count == 0) | |
781 | genpd->suspend_power_off = false; | |
782 | ||
783 | mutex_unlock(&genpd->lock); | |
17b75eca | 784 | pm_runtime_enable(dev); |
b6c10c84 | 785 | } |
17b75eca RW |
786 | |
787 | pm_runtime_put_sync(dev); | |
b6c10c84 | 788 | return ret; |
596ba34b RW |
789 | } |
790 | ||
791 | /** | |
792 | * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. | |
793 | * @dev: Device to suspend. | |
794 | * | |
795 | * Suspend a device under the assumption that its pm_domain field points to the | |
796 | * domain member of an object of type struct generic_pm_domain representing | |
797 | * a PM domain consisting of I/O devices. | |
798 | */ | |
799 | static int pm_genpd_suspend(struct device *dev) | |
800 | { | |
801 | struct generic_pm_domain *genpd; | |
802 | ||
803 | dev_dbg(dev, "%s()\n", __func__); | |
804 | ||
805 | genpd = dev_to_genpd(dev); | |
806 | if (IS_ERR(genpd)) | |
807 | return -EINVAL; | |
808 | ||
d23b9b00 | 809 | return genpd->suspend_power_off ? 0 : genpd_suspend_dev(genpd, dev); |
596ba34b RW |
810 | } |
811 | ||
812 | /** | |
813 | * pm_genpd_suspend_noirq - Late suspend of a device from an I/O PM domain. | |
814 | * @dev: Device to suspend. | |
815 | * | |
816 | * Carry out a late suspend of a device under the assumption that its | |
817 | * pm_domain field points to the domain member of an object of type | |
818 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
819 | */ | |
820 | static int pm_genpd_suspend_noirq(struct device *dev) | |
821 | { | |
822 | struct generic_pm_domain *genpd; | |
823 | int ret; | |
824 | ||
825 | dev_dbg(dev, "%s()\n", __func__); | |
826 | ||
827 | genpd = dev_to_genpd(dev); | |
828 | if (IS_ERR(genpd)) | |
829 | return -EINVAL; | |
830 | ||
831 | if (genpd->suspend_power_off) | |
832 | return 0; | |
833 | ||
d23b9b00 | 834 | ret = genpd_suspend_late(genpd, dev); |
596ba34b RW |
835 | if (ret) |
836 | return ret; | |
837 | ||
d5e4cbfe | 838 | if (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)) |
d4f2d87a RW |
839 | return 0; |
840 | ||
d5e4cbfe | 841 | genpd_stop_dev(genpd, dev); |
596ba34b RW |
842 | |
843 | /* | |
844 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
845 | * guaranteed that this function will never run twice in parallel for | |
846 | * the same PM domain, so it is not necessary to use locking here. | |
847 | */ | |
848 | genpd->suspended_count++; | |
849 | pm_genpd_sync_poweroff(genpd); | |
850 | ||
851 | return 0; | |
852 | } | |
853 | ||
854 | /** | |
855 | * pm_genpd_resume_noirq - Early resume of a device from an I/O power domain. | |
856 | * @dev: Device to resume. | |
857 | * | |
858 | * Carry out an early resume of a device under the assumption that its | |
859 | * pm_domain field points to the domain member of an object of type | |
860 | * struct generic_pm_domain representing a power domain consisting of I/O | |
861 | * devices. | |
862 | */ | |
863 | static int pm_genpd_resume_noirq(struct device *dev) | |
864 | { | |
865 | struct generic_pm_domain *genpd; | |
866 | ||
867 | dev_dbg(dev, "%s()\n", __func__); | |
868 | ||
869 | genpd = dev_to_genpd(dev); | |
870 | if (IS_ERR(genpd)) | |
871 | return -EINVAL; | |
872 | ||
873 | if (genpd->suspend_power_off) | |
874 | return 0; | |
875 | ||
876 | /* | |
877 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
878 | * guaranteed that this function will never run twice in parallel for | |
879 | * the same PM domain, so it is not necessary to use locking here. | |
880 | */ | |
881 | pm_genpd_poweron(genpd); | |
882 | genpd->suspended_count--; | |
d5e4cbfe | 883 | genpd_start_dev(genpd, dev); |
596ba34b | 884 | |
d23b9b00 | 885 | return genpd_resume_early(genpd, dev); |
596ba34b RW |
886 | } |
887 | ||
888 | /** | |
889 | * pm_genpd_resume - Resume a device belonging to an I/O power domain. | |
890 | * @dev: Device to resume. | |
891 | * | |
892 | * Resume a device under the assumption that its pm_domain field points to the | |
893 | * domain member of an object of type struct generic_pm_domain representing | |
894 | * a power domain consisting of I/O devices. | |
895 | */ | |
896 | static int pm_genpd_resume(struct device *dev) | |
897 | { | |
898 | struct generic_pm_domain *genpd; | |
899 | ||
900 | dev_dbg(dev, "%s()\n", __func__); | |
901 | ||
902 | genpd = dev_to_genpd(dev); | |
903 | if (IS_ERR(genpd)) | |
904 | return -EINVAL; | |
905 | ||
d23b9b00 | 906 | return genpd->suspend_power_off ? 0 : genpd_resume_dev(genpd, dev); |
596ba34b RW |
907 | } |
908 | ||
909 | /** | |
910 | * pm_genpd_freeze - Freeze a device belonging to an I/O power domain. | |
911 | * @dev: Device to freeze. | |
912 | * | |
913 | * Freeze a device under the assumption that its pm_domain field points to the | |
914 | * domain member of an object of type struct generic_pm_domain representing | |
915 | * a power domain consisting of I/O devices. | |
916 | */ | |
917 | static int pm_genpd_freeze(struct device *dev) | |
918 | { | |
919 | struct generic_pm_domain *genpd; | |
920 | ||
921 | dev_dbg(dev, "%s()\n", __func__); | |
922 | ||
923 | genpd = dev_to_genpd(dev); | |
924 | if (IS_ERR(genpd)) | |
925 | return -EINVAL; | |
926 | ||
d23b9b00 | 927 | return genpd->suspend_power_off ? 0 : genpd_freeze_dev(genpd, dev); |
596ba34b RW |
928 | } |
929 | ||
930 | /** | |
931 | * pm_genpd_freeze_noirq - Late freeze of a device from an I/O power domain. | |
932 | * @dev: Device to freeze. | |
933 | * | |
934 | * Carry out a late freeze of a device under the assumption that its | |
935 | * pm_domain field points to the domain member of an object of type | |
936 | * struct generic_pm_domain representing a power domain consisting of I/O | |
937 | * devices. | |
938 | */ | |
939 | static int pm_genpd_freeze_noirq(struct device *dev) | |
940 | { | |
941 | struct generic_pm_domain *genpd; | |
942 | int ret; | |
943 | ||
944 | dev_dbg(dev, "%s()\n", __func__); | |
945 | ||
946 | genpd = dev_to_genpd(dev); | |
947 | if (IS_ERR(genpd)) | |
948 | return -EINVAL; | |
949 | ||
950 | if (genpd->suspend_power_off) | |
951 | return 0; | |
952 | ||
d23b9b00 | 953 | ret = genpd_freeze_late(genpd, dev); |
596ba34b RW |
954 | if (ret) |
955 | return ret; | |
956 | ||
d5e4cbfe | 957 | genpd_stop_dev(genpd, dev); |
596ba34b RW |
958 | |
959 | return 0; | |
960 | } | |
961 | ||
962 | /** | |
963 | * pm_genpd_thaw_noirq - Early thaw of a device from an I/O power domain. | |
964 | * @dev: Device to thaw. | |
965 | * | |
966 | * Carry out an early thaw of a device under the assumption that its | |
967 | * pm_domain field points to the domain member of an object of type | |
968 | * struct generic_pm_domain representing a power domain consisting of I/O | |
969 | * devices. | |
970 | */ | |
971 | static int pm_genpd_thaw_noirq(struct device *dev) | |
972 | { | |
973 | struct generic_pm_domain *genpd; | |
974 | ||
975 | dev_dbg(dev, "%s()\n", __func__); | |
976 | ||
977 | genpd = dev_to_genpd(dev); | |
978 | if (IS_ERR(genpd)) | |
979 | return -EINVAL; | |
980 | ||
981 | if (genpd->suspend_power_off) | |
982 | return 0; | |
983 | ||
d5e4cbfe | 984 | genpd_start_dev(genpd, dev); |
596ba34b | 985 | |
d23b9b00 | 986 | return genpd_thaw_early(genpd, dev); |
596ba34b RW |
987 | } |
988 | ||
989 | /** | |
990 | * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. | |
991 | * @dev: Device to thaw. | |
992 | * | |
993 | * Thaw a device under the assumption that its pm_domain field points to the | |
994 | * domain member of an object of type struct generic_pm_domain representing | |
995 | * a power domain consisting of I/O devices. | |
996 | */ | |
997 | static int pm_genpd_thaw(struct device *dev) | |
998 | { | |
999 | struct generic_pm_domain *genpd; | |
1000 | ||
1001 | dev_dbg(dev, "%s()\n", __func__); | |
1002 | ||
1003 | genpd = dev_to_genpd(dev); | |
1004 | if (IS_ERR(genpd)) | |
1005 | return -EINVAL; | |
1006 | ||
d23b9b00 | 1007 | return genpd->suspend_power_off ? 0 : genpd_thaw_dev(genpd, dev); |
596ba34b RW |
1008 | } |
1009 | ||
1010 | /** | |
1011 | * pm_genpd_restore_noirq - Early restore of a device from an I/O power domain. | |
1012 | * @dev: Device to resume. | |
1013 | * | |
1014 | * Carry out an early restore of a device under the assumption that its | |
1015 | * pm_domain field points to the domain member of an object of type | |
1016 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1017 | * devices. | |
1018 | */ | |
1019 | static int pm_genpd_restore_noirq(struct device *dev) | |
1020 | { | |
1021 | struct generic_pm_domain *genpd; | |
1022 | ||
1023 | dev_dbg(dev, "%s()\n", __func__); | |
1024 | ||
1025 | genpd = dev_to_genpd(dev); | |
1026 | if (IS_ERR(genpd)) | |
1027 | return -EINVAL; | |
1028 | ||
1029 | /* | |
1030 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1031 | * guaranteed that this function will never run twice in parallel for | |
1032 | * the same PM domain, so it is not necessary to use locking here. | |
1033 | */ | |
17b75eca | 1034 | genpd->status = GPD_STATE_POWER_OFF; |
596ba34b RW |
1035 | if (genpd->suspend_power_off) { |
1036 | /* | |
1037 | * The boot kernel might put the domain into the power on state, | |
1038 | * so make sure it really is powered off. | |
1039 | */ | |
1040 | if (genpd->power_off) | |
1041 | genpd->power_off(genpd); | |
1042 | return 0; | |
1043 | } | |
1044 | ||
1045 | pm_genpd_poweron(genpd); | |
1046 | genpd->suspended_count--; | |
d5e4cbfe | 1047 | genpd_start_dev(genpd, dev); |
596ba34b | 1048 | |
d23b9b00 | 1049 | return genpd_resume_early(genpd, dev); |
596ba34b RW |
1050 | } |
1051 | ||
1052 | /** | |
1053 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
1054 | * @dev: Device to complete the transition of. | |
1055 | * | |
1056 | * Complete a power transition of a device (during a system-wide power | |
1057 | * transition) under the assumption that its pm_domain field points to the | |
1058 | * domain member of an object of type struct generic_pm_domain representing | |
1059 | * a power domain consisting of I/O devices. | |
1060 | */ | |
1061 | static void pm_genpd_complete(struct device *dev) | |
1062 | { | |
1063 | struct generic_pm_domain *genpd; | |
1064 | bool run_complete; | |
1065 | ||
1066 | dev_dbg(dev, "%s()\n", __func__); | |
1067 | ||
1068 | genpd = dev_to_genpd(dev); | |
1069 | if (IS_ERR(genpd)) | |
1070 | return; | |
1071 | ||
1072 | mutex_lock(&genpd->lock); | |
1073 | ||
1074 | run_complete = !genpd->suspend_power_off; | |
1075 | if (--genpd->prepared_count == 0) | |
1076 | genpd->suspend_power_off = false; | |
1077 | ||
1078 | mutex_unlock(&genpd->lock); | |
1079 | ||
1080 | if (run_complete) { | |
1081 | pm_generic_complete(dev); | |
6f00ff78 | 1082 | pm_runtime_set_active(dev); |
596ba34b | 1083 | pm_runtime_enable(dev); |
6f00ff78 | 1084 | pm_runtime_idle(dev); |
596ba34b RW |
1085 | } |
1086 | } | |
1087 | ||
1088 | #else | |
1089 | ||
1090 | #define pm_genpd_prepare NULL | |
1091 | #define pm_genpd_suspend NULL | |
1092 | #define pm_genpd_suspend_noirq NULL | |
1093 | #define pm_genpd_resume_noirq NULL | |
1094 | #define pm_genpd_resume NULL | |
1095 | #define pm_genpd_freeze NULL | |
1096 | #define pm_genpd_freeze_noirq NULL | |
1097 | #define pm_genpd_thaw_noirq NULL | |
1098 | #define pm_genpd_thaw NULL | |
596ba34b | 1099 | #define pm_genpd_restore_noirq NULL |
596ba34b RW |
1100 | #define pm_genpd_complete NULL |
1101 | ||
1102 | #endif /* CONFIG_PM_SLEEP */ | |
1103 | ||
f721889f | 1104 | /** |
b02c999a | 1105 | * __pm_genpd_add_device - Add a device to an I/O PM domain. |
f721889f RW |
1106 | * @genpd: PM domain to add the device to. |
1107 | * @dev: Device to be added. | |
b02c999a | 1108 | * @td: Set of PM QoS timing parameters to attach to the device. |
f721889f | 1109 | */ |
b02c999a RW |
1110 | int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1111 | struct gpd_timing_data *td) | |
f721889f | 1112 | { |
cd0ea672 | 1113 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1114 | struct pm_domain_data *pdd; |
f721889f RW |
1115 | int ret = 0; |
1116 | ||
1117 | dev_dbg(dev, "%s()\n", __func__); | |
1118 | ||
1119 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1120 | return -EINVAL; | |
1121 | ||
17b75eca | 1122 | genpd_acquire_lock(genpd); |
f721889f | 1123 | |
17b75eca | 1124 | if (genpd->status == GPD_STATE_POWER_OFF) { |
f721889f RW |
1125 | ret = -EINVAL; |
1126 | goto out; | |
1127 | } | |
1128 | ||
596ba34b RW |
1129 | if (genpd->prepared_count > 0) { |
1130 | ret = -EAGAIN; | |
1131 | goto out; | |
1132 | } | |
1133 | ||
4605ab65 RW |
1134 | list_for_each_entry(pdd, &genpd->dev_list, list_node) |
1135 | if (pdd->dev == dev) { | |
f721889f RW |
1136 | ret = -EINVAL; |
1137 | goto out; | |
1138 | } | |
1139 | ||
cd0ea672 RW |
1140 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); |
1141 | if (!gpd_data) { | |
1142 | ret = -ENOMEM; | |
1143 | goto out; | |
1144 | } | |
1145 | ||
596ba34b | 1146 | genpd->device_count++; |
f721889f | 1147 | |
f721889f | 1148 | dev->pm_domain = &genpd->domain; |
4605ab65 | 1149 | dev_pm_get_subsys_data(dev); |
cd0ea672 RW |
1150 | dev->power.subsys_data->domain_data = &gpd_data->base; |
1151 | gpd_data->base.dev = dev; | |
1152 | gpd_data->need_restore = false; | |
1153 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); | |
b02c999a RW |
1154 | if (td) |
1155 | gpd_data->td = *td; | |
f721889f RW |
1156 | |
1157 | out: | |
17b75eca | 1158 | genpd_release_lock(genpd); |
f721889f RW |
1159 | |
1160 | return ret; | |
1161 | } | |
1162 | ||
1163 | /** | |
1164 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1165 | * @genpd: PM domain to remove the device from. | |
1166 | * @dev: Device to be removed. | |
1167 | */ | |
1168 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1169 | struct device *dev) | |
1170 | { | |
4605ab65 | 1171 | struct pm_domain_data *pdd; |
f721889f RW |
1172 | int ret = -EINVAL; |
1173 | ||
1174 | dev_dbg(dev, "%s()\n", __func__); | |
1175 | ||
1176 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1177 | return -EINVAL; | |
1178 | ||
17b75eca | 1179 | genpd_acquire_lock(genpd); |
f721889f | 1180 | |
596ba34b RW |
1181 | if (genpd->prepared_count > 0) { |
1182 | ret = -EAGAIN; | |
1183 | goto out; | |
1184 | } | |
1185 | ||
4605ab65 RW |
1186 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { |
1187 | if (pdd->dev != dev) | |
f721889f RW |
1188 | continue; |
1189 | ||
4605ab65 RW |
1190 | list_del_init(&pdd->list_node); |
1191 | pdd->dev = NULL; | |
1192 | dev_pm_put_subsys_data(dev); | |
f721889f | 1193 | dev->pm_domain = NULL; |
cd0ea672 | 1194 | kfree(to_gpd_data(pdd)); |
f721889f | 1195 | |
596ba34b | 1196 | genpd->device_count--; |
f721889f RW |
1197 | |
1198 | ret = 0; | |
1199 | break; | |
1200 | } | |
1201 | ||
596ba34b | 1202 | out: |
17b75eca | 1203 | genpd_release_lock(genpd); |
f721889f RW |
1204 | |
1205 | return ret; | |
1206 | } | |
1207 | ||
1208 | /** | |
1209 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1210 | * @genpd: Master PM domain to add the subdomain to. | |
bc0403ff | 1211 | * @subdomain: Subdomain to be added. |
f721889f RW |
1212 | */ |
1213 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
bc0403ff | 1214 | struct generic_pm_domain *subdomain) |
f721889f | 1215 | { |
5063ce15 | 1216 | struct gpd_link *link; |
f721889f RW |
1217 | int ret = 0; |
1218 | ||
bc0403ff | 1219 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1220 | return -EINVAL; |
1221 | ||
17b75eca RW |
1222 | start: |
1223 | genpd_acquire_lock(genpd); | |
bc0403ff | 1224 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); |
f721889f | 1225 | |
bc0403ff RW |
1226 | if (subdomain->status != GPD_STATE_POWER_OFF |
1227 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1228 | mutex_unlock(&subdomain->lock); | |
17b75eca RW |
1229 | genpd_release_lock(genpd); |
1230 | goto start; | |
1231 | } | |
1232 | ||
1233 | if (genpd->status == GPD_STATE_POWER_OFF | |
bc0403ff | 1234 | && subdomain->status != GPD_STATE_POWER_OFF) { |
f721889f RW |
1235 | ret = -EINVAL; |
1236 | goto out; | |
1237 | } | |
1238 | ||
5063ce15 | 1239 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
bc0403ff | 1240 | if (link->slave == subdomain && link->master == genpd) { |
f721889f RW |
1241 | ret = -EINVAL; |
1242 | goto out; | |
1243 | } | |
1244 | } | |
1245 | ||
5063ce15 RW |
1246 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1247 | if (!link) { | |
1248 | ret = -ENOMEM; | |
1249 | goto out; | |
1250 | } | |
1251 | link->master = genpd; | |
1252 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1253 | link->slave = subdomain; |
1254 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
1255 | if (subdomain->status != GPD_STATE_POWER_OFF) | |
c4bb3160 | 1256 | genpd_sd_counter_inc(genpd); |
f721889f | 1257 | |
f721889f | 1258 | out: |
bc0403ff | 1259 | mutex_unlock(&subdomain->lock); |
17b75eca | 1260 | genpd_release_lock(genpd); |
f721889f RW |
1261 | |
1262 | return ret; | |
1263 | } | |
1264 | ||
1265 | /** | |
1266 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1267 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1268 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1269 | */ |
1270 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1271 | struct generic_pm_domain *subdomain) |
f721889f | 1272 | { |
5063ce15 | 1273 | struct gpd_link *link; |
f721889f RW |
1274 | int ret = -EINVAL; |
1275 | ||
5063ce15 | 1276 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1277 | return -EINVAL; |
1278 | ||
17b75eca RW |
1279 | start: |
1280 | genpd_acquire_lock(genpd); | |
f721889f | 1281 | |
5063ce15 RW |
1282 | list_for_each_entry(link, &genpd->master_links, master_node) { |
1283 | if (link->slave != subdomain) | |
f721889f RW |
1284 | continue; |
1285 | ||
1286 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); | |
1287 | ||
17b75eca RW |
1288 | if (subdomain->status != GPD_STATE_POWER_OFF |
1289 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1290 | mutex_unlock(&subdomain->lock); | |
1291 | genpd_release_lock(genpd); | |
1292 | goto start; | |
1293 | } | |
1294 | ||
5063ce15 RW |
1295 | list_del(&link->master_node); |
1296 | list_del(&link->slave_node); | |
1297 | kfree(link); | |
17b75eca | 1298 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1299 | genpd_sd_counter_dec(genpd); |
1300 | ||
1301 | mutex_unlock(&subdomain->lock); | |
1302 | ||
1303 | ret = 0; | |
1304 | break; | |
1305 | } | |
1306 | ||
17b75eca | 1307 | genpd_release_lock(genpd); |
f721889f RW |
1308 | |
1309 | return ret; | |
1310 | } | |
1311 | ||
d5e4cbfe RW |
1312 | /** |
1313 | * pm_genpd_add_callbacks - Add PM domain callbacks to a given device. | |
1314 | * @dev: Device to add the callbacks to. | |
1315 | * @ops: Set of callbacks to add. | |
b02c999a | 1316 | * @td: Timing data to add to the device along with the callbacks (optional). |
d5e4cbfe | 1317 | */ |
b02c999a RW |
1318 | int pm_genpd_add_callbacks(struct device *dev, struct gpd_dev_ops *ops, |
1319 | struct gpd_timing_data *td) | |
d5e4cbfe RW |
1320 | { |
1321 | struct pm_domain_data *pdd; | |
1322 | int ret = 0; | |
1323 | ||
1324 | if (!(dev && dev->power.subsys_data && ops)) | |
1325 | return -EINVAL; | |
1326 | ||
1327 | pm_runtime_disable(dev); | |
1328 | device_pm_lock(); | |
1329 | ||
1330 | pdd = dev->power.subsys_data->domain_data; | |
1331 | if (pdd) { | |
1332 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); | |
1333 | ||
1334 | gpd_data->ops = *ops; | |
b02c999a RW |
1335 | if (td) |
1336 | gpd_data->td = *td; | |
d5e4cbfe RW |
1337 | } else { |
1338 | ret = -EINVAL; | |
1339 | } | |
1340 | ||
1341 | device_pm_unlock(); | |
1342 | pm_runtime_enable(dev); | |
1343 | ||
1344 | return ret; | |
1345 | } | |
1346 | EXPORT_SYMBOL_GPL(pm_genpd_add_callbacks); | |
1347 | ||
1348 | /** | |
b02c999a | 1349 | * __pm_genpd_remove_callbacks - Remove PM domain callbacks from a given device. |
d5e4cbfe | 1350 | * @dev: Device to remove the callbacks from. |
b02c999a | 1351 | * @clear_td: If set, clear the device's timing data too. |
d5e4cbfe | 1352 | */ |
b02c999a | 1353 | int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td) |
d5e4cbfe RW |
1354 | { |
1355 | struct pm_domain_data *pdd; | |
1356 | int ret = 0; | |
1357 | ||
1358 | if (!(dev && dev->power.subsys_data)) | |
1359 | return -EINVAL; | |
1360 | ||
1361 | pm_runtime_disable(dev); | |
1362 | device_pm_lock(); | |
1363 | ||
1364 | pdd = dev->power.subsys_data->domain_data; | |
1365 | if (pdd) { | |
1366 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); | |
1367 | ||
1368 | gpd_data->ops = (struct gpd_dev_ops){ 0 }; | |
b02c999a RW |
1369 | if (clear_td) |
1370 | gpd_data->td = (struct gpd_timing_data){ 0 }; | |
d5e4cbfe RW |
1371 | } else { |
1372 | ret = -EINVAL; | |
1373 | } | |
1374 | ||
1375 | device_pm_unlock(); | |
1376 | pm_runtime_enable(dev); | |
1377 | ||
1378 | return ret; | |
1379 | } | |
b02c999a | 1380 | EXPORT_SYMBOL_GPL(__pm_genpd_remove_callbacks); |
d5e4cbfe | 1381 | |
d23b9b00 RW |
1382 | /* Default device callbacks for generic PM domains. */ |
1383 | ||
ecf00475 RW |
1384 | /** |
1385 | * pm_genpd_default_save_state - Default "save device state" for PM domians. | |
1386 | * @dev: Device to handle. | |
1387 | */ | |
1388 | static int pm_genpd_default_save_state(struct device *dev) | |
1389 | { | |
1390 | int (*cb)(struct device *__dev); | |
1391 | struct device_driver *drv = dev->driver; | |
1392 | ||
1393 | cb = dev_gpd_data(dev)->ops.save_state; | |
1394 | if (cb) | |
1395 | return cb(dev); | |
1396 | ||
1397 | if (drv && drv->pm && drv->pm->runtime_suspend) | |
1398 | return drv->pm->runtime_suspend(dev); | |
1399 | ||
1400 | return 0; | |
1401 | } | |
1402 | ||
1403 | /** | |
1404 | * pm_genpd_default_restore_state - Default PM domians "restore device state". | |
1405 | * @dev: Device to handle. | |
1406 | */ | |
1407 | static int pm_genpd_default_restore_state(struct device *dev) | |
1408 | { | |
1409 | int (*cb)(struct device *__dev); | |
1410 | struct device_driver *drv = dev->driver; | |
1411 | ||
1412 | cb = dev_gpd_data(dev)->ops.restore_state; | |
1413 | if (cb) | |
1414 | return cb(dev); | |
1415 | ||
1416 | if (drv && drv->pm && drv->pm->runtime_resume) | |
1417 | return drv->pm->runtime_resume(dev); | |
1418 | ||
1419 | return 0; | |
1420 | } | |
1421 | ||
d23b9b00 RW |
1422 | /** |
1423 | * pm_genpd_default_suspend - Default "device suspend" for PM domians. | |
1424 | * @dev: Device to handle. | |
1425 | */ | |
1426 | static int pm_genpd_default_suspend(struct device *dev) | |
1427 | { | |
1428 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze; | |
1429 | ||
1430 | return cb ? cb(dev) : pm_generic_suspend(dev); | |
1431 | } | |
1432 | ||
1433 | /** | |
1434 | * pm_genpd_default_suspend_late - Default "late device suspend" for PM domians. | |
1435 | * @dev: Device to handle. | |
1436 | */ | |
1437 | static int pm_genpd_default_suspend_late(struct device *dev) | |
1438 | { | |
1439 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze_late; | |
1440 | ||
1441 | return cb ? cb(dev) : pm_generic_suspend_noirq(dev); | |
1442 | } | |
1443 | ||
1444 | /** | |
1445 | * pm_genpd_default_resume_early - Default "early device resume" for PM domians. | |
1446 | * @dev: Device to handle. | |
1447 | */ | |
1448 | static int pm_genpd_default_resume_early(struct device *dev) | |
1449 | { | |
1450 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw_early; | |
1451 | ||
1452 | return cb ? cb(dev) : pm_generic_resume_noirq(dev); | |
1453 | } | |
1454 | ||
1455 | /** | |
1456 | * pm_genpd_default_resume - Default "device resume" for PM domians. | |
1457 | * @dev: Device to handle. | |
1458 | */ | |
1459 | static int pm_genpd_default_resume(struct device *dev) | |
1460 | { | |
1461 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw; | |
1462 | ||
1463 | return cb ? cb(dev) : pm_generic_resume(dev); | |
1464 | } | |
1465 | ||
1466 | /** | |
1467 | * pm_genpd_default_freeze - Default "device freeze" for PM domians. | |
1468 | * @dev: Device to handle. | |
1469 | */ | |
1470 | static int pm_genpd_default_freeze(struct device *dev) | |
1471 | { | |
1472 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze; | |
1473 | ||
1474 | return cb ? cb(dev) : pm_generic_freeze(dev); | |
1475 | } | |
1476 | ||
1477 | /** | |
1478 | * pm_genpd_default_freeze_late - Default "late device freeze" for PM domians. | |
1479 | * @dev: Device to handle. | |
1480 | */ | |
1481 | static int pm_genpd_default_freeze_late(struct device *dev) | |
1482 | { | |
1483 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze_late; | |
1484 | ||
1485 | return cb ? cb(dev) : pm_generic_freeze_noirq(dev); | |
1486 | } | |
1487 | ||
1488 | /** | |
1489 | * pm_genpd_default_thaw_early - Default "early device thaw" for PM domians. | |
1490 | * @dev: Device to handle. | |
1491 | */ | |
1492 | static int pm_genpd_default_thaw_early(struct device *dev) | |
1493 | { | |
1494 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw_early; | |
1495 | ||
1496 | return cb ? cb(dev) : pm_generic_thaw_noirq(dev); | |
1497 | } | |
1498 | ||
1499 | /** | |
1500 | * pm_genpd_default_thaw - Default "device thaw" for PM domians. | |
1501 | * @dev: Device to handle. | |
1502 | */ | |
1503 | static int pm_genpd_default_thaw(struct device *dev) | |
1504 | { | |
1505 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw; | |
1506 | ||
1507 | return cb ? cb(dev) : pm_generic_thaw(dev); | |
1508 | } | |
1509 | ||
f721889f RW |
1510 | /** |
1511 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1512 | * @genpd: PM domain object to initialize. | |
1513 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1514 | * @is_off: Initial value of the domain's power_is_off field. | |
1515 | */ | |
1516 | void pm_genpd_init(struct generic_pm_domain *genpd, | |
1517 | struct dev_power_governor *gov, bool is_off) | |
1518 | { | |
1519 | if (IS_ERR_OR_NULL(genpd)) | |
1520 | return; | |
1521 | ||
5063ce15 RW |
1522 | INIT_LIST_HEAD(&genpd->master_links); |
1523 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1524 | INIT_LIST_HEAD(&genpd->dev_list); |
f721889f RW |
1525 | mutex_init(&genpd->lock); |
1526 | genpd->gov = gov; | |
1527 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
1528 | genpd->in_progress = 0; | |
c4bb3160 | 1529 | atomic_set(&genpd->sd_count, 0); |
17b75eca RW |
1530 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
1531 | init_waitqueue_head(&genpd->status_wait_queue); | |
c6d22b37 RW |
1532 | genpd->poweroff_task = NULL; |
1533 | genpd->resume_count = 0; | |
596ba34b RW |
1534 | genpd->device_count = 0; |
1535 | genpd->suspended_count = 0; | |
221e9b58 | 1536 | genpd->max_off_time_ns = -1; |
f721889f RW |
1537 | genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; |
1538 | genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; | |
1539 | genpd->domain.ops.runtime_idle = pm_generic_runtime_idle; | |
596ba34b RW |
1540 | genpd->domain.ops.prepare = pm_genpd_prepare; |
1541 | genpd->domain.ops.suspend = pm_genpd_suspend; | |
1542 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; | |
1543 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; | |
1544 | genpd->domain.ops.resume = pm_genpd_resume; | |
1545 | genpd->domain.ops.freeze = pm_genpd_freeze; | |
1546 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; | |
1547 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; | |
1548 | genpd->domain.ops.thaw = pm_genpd_thaw; | |
d23b9b00 RW |
1549 | genpd->domain.ops.poweroff = pm_genpd_suspend; |
1550 | genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq; | |
596ba34b | 1551 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; |
d23b9b00 | 1552 | genpd->domain.ops.restore = pm_genpd_resume; |
596ba34b | 1553 | genpd->domain.ops.complete = pm_genpd_complete; |
ecf00475 RW |
1554 | genpd->dev_ops.save_state = pm_genpd_default_save_state; |
1555 | genpd->dev_ops.restore_state = pm_genpd_default_restore_state; | |
d23b9b00 RW |
1556 | genpd->dev_ops.freeze = pm_genpd_default_suspend; |
1557 | genpd->dev_ops.freeze_late = pm_genpd_default_suspend_late; | |
1558 | genpd->dev_ops.thaw_early = pm_genpd_default_resume_early; | |
1559 | genpd->dev_ops.thaw = pm_genpd_default_resume; | |
1560 | genpd->dev_ops.freeze = pm_genpd_default_freeze; | |
1561 | genpd->dev_ops.freeze_late = pm_genpd_default_freeze_late; | |
1562 | genpd->dev_ops.thaw_early = pm_genpd_default_thaw_early; | |
1563 | genpd->dev_ops.thaw = pm_genpd_default_thaw; | |
5125bbf3 RW |
1564 | mutex_lock(&gpd_list_lock); |
1565 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1566 | mutex_unlock(&gpd_list_lock); | |
1567 | } |