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> | |
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)); | |
e84b2c20 | 212 | if (elapsed_ns > genpd->power_on_latency_ns) { |
0140d8bd | 213 | genpd->power_on_latency_ns = elapsed_ns; |
e84b2c20 RW |
214 | if (genpd->name) |
215 | pr_warning("%s: Power-on latency exceeded, " | |
216 | "new value %lld ns\n", genpd->name, | |
217 | elapsed_ns); | |
218 | } | |
3c07cbc4 | 219 | } |
5248051b | 220 | |
9e08cf42 RW |
221 | genpd_set_active(genpd); |
222 | ||
3f241775 | 223 | return 0; |
9e08cf42 RW |
224 | |
225 | err: | |
5063ce15 RW |
226 | list_for_each_entry_continue_reverse(link, &genpd->slave_links, slave_node) |
227 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 228 | |
3f241775 RW |
229 | return ret; |
230 | } | |
231 | ||
232 | /** | |
5063ce15 | 233 | * pm_genpd_poweron - Restore power to a given PM domain and its masters. |
3f241775 RW |
234 | * @genpd: PM domain to power up. |
235 | */ | |
236 | int pm_genpd_poweron(struct generic_pm_domain *genpd) | |
237 | { | |
238 | int ret; | |
239 | ||
240 | mutex_lock(&genpd->lock); | |
241 | ret = __pm_genpd_poweron(genpd); | |
242 | mutex_unlock(&genpd->lock); | |
243 | return ret; | |
5248051b RW |
244 | } |
245 | ||
246 | #endif /* CONFIG_PM */ | |
247 | ||
248 | #ifdef CONFIG_PM_RUNTIME | |
249 | ||
f721889f RW |
250 | /** |
251 | * __pm_genpd_save_device - Save the pre-suspend state of a device. | |
4605ab65 | 252 | * @pdd: Domain data of the device to save the state of. |
f721889f RW |
253 | * @genpd: PM domain the device belongs to. |
254 | */ | |
4605ab65 | 255 | static int __pm_genpd_save_device(struct pm_domain_data *pdd, |
f721889f | 256 | struct generic_pm_domain *genpd) |
17b75eca | 257 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 258 | { |
cd0ea672 | 259 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
4605ab65 | 260 | struct device *dev = pdd->dev; |
f721889f RW |
261 | int ret = 0; |
262 | ||
cd0ea672 | 263 | if (gpd_data->need_restore) |
f721889f RW |
264 | return 0; |
265 | ||
17b75eca RW |
266 | mutex_unlock(&genpd->lock); |
267 | ||
ecf00475 RW |
268 | genpd_start_dev(genpd, dev); |
269 | ret = genpd_save_dev(genpd, dev); | |
270 | genpd_stop_dev(genpd, dev); | |
f721889f | 271 | |
17b75eca RW |
272 | mutex_lock(&genpd->lock); |
273 | ||
f721889f | 274 | if (!ret) |
cd0ea672 | 275 | gpd_data->need_restore = true; |
f721889f RW |
276 | |
277 | return ret; | |
278 | } | |
279 | ||
280 | /** | |
281 | * __pm_genpd_restore_device - Restore the pre-suspend state of a device. | |
4605ab65 | 282 | * @pdd: Domain data of the device to restore the state of. |
f721889f RW |
283 | * @genpd: PM domain the device belongs to. |
284 | */ | |
4605ab65 | 285 | static void __pm_genpd_restore_device(struct pm_domain_data *pdd, |
f721889f | 286 | struct generic_pm_domain *genpd) |
17b75eca | 287 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 288 | { |
cd0ea672 | 289 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
4605ab65 | 290 | struct device *dev = pdd->dev; |
f721889f | 291 | |
cd0ea672 | 292 | if (!gpd_data->need_restore) |
f721889f RW |
293 | return; |
294 | ||
17b75eca RW |
295 | mutex_unlock(&genpd->lock); |
296 | ||
ecf00475 RW |
297 | genpd_start_dev(genpd, dev); |
298 | genpd_restore_dev(genpd, dev); | |
299 | genpd_stop_dev(genpd, dev); | |
f721889f | 300 | |
17b75eca RW |
301 | mutex_lock(&genpd->lock); |
302 | ||
cd0ea672 | 303 | gpd_data->need_restore = false; |
f721889f RW |
304 | } |
305 | ||
c6d22b37 RW |
306 | /** |
307 | * genpd_abort_poweroff - Check if a PM domain power off should be aborted. | |
308 | * @genpd: PM domain to check. | |
309 | * | |
310 | * Return true if a PM domain's status changed to GPD_STATE_ACTIVE during | |
311 | * a "power off" operation, which means that a "power on" has occured in the | |
312 | * meantime, or if its resume_count field is different from zero, which means | |
313 | * that one of its devices has been resumed in the meantime. | |
314 | */ | |
315 | static bool genpd_abort_poweroff(struct generic_pm_domain *genpd) | |
316 | { | |
17877eb5 | 317 | return genpd->status == GPD_STATE_WAIT_MASTER |
3f241775 | 318 | || genpd->status == GPD_STATE_ACTIVE || genpd->resume_count > 0; |
c6d22b37 RW |
319 | } |
320 | ||
56375fd4 RW |
321 | /** |
322 | * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff(). | |
323 | * @genpd: PM domait to power off. | |
324 | * | |
325 | * Queue up the execution of pm_genpd_poweroff() unless it's already been done | |
326 | * before. | |
327 | */ | |
0bc5b2de | 328 | void genpd_queue_power_off_work(struct generic_pm_domain *genpd) |
56375fd4 RW |
329 | { |
330 | if (!work_pending(&genpd->power_off_work)) | |
331 | queue_work(pm_wq, &genpd->power_off_work); | |
332 | } | |
333 | ||
f721889f RW |
334 | /** |
335 | * pm_genpd_poweroff - Remove power from a given PM domain. | |
336 | * @genpd: PM domain to power down. | |
337 | * | |
338 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
339 | * have been powered down, run the runtime suspend callbacks provided by all of | |
340 | * the @genpd's devices' drivers and remove power from @genpd. | |
341 | */ | |
342 | static int pm_genpd_poweroff(struct generic_pm_domain *genpd) | |
17b75eca | 343 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 344 | { |
4605ab65 | 345 | struct pm_domain_data *pdd; |
5063ce15 | 346 | struct gpd_link *link; |
f721889f | 347 | unsigned int not_suspended; |
c6d22b37 | 348 | int ret = 0; |
f721889f | 349 | |
c6d22b37 RW |
350 | start: |
351 | /* | |
352 | * Do not try to power off the domain in the following situations: | |
353 | * (1) The domain is already in the "power off" state. | |
5063ce15 | 354 | * (2) The domain is waiting for its master to power up. |
c6d22b37 | 355 | * (3) One of the domain's devices is being resumed right now. |
3f241775 | 356 | * (4) System suspend is in progress. |
c6d22b37 | 357 | */ |
3f241775 | 358 | if (genpd->status == GPD_STATE_POWER_OFF |
17877eb5 | 359 | || genpd->status == GPD_STATE_WAIT_MASTER |
3f241775 | 360 | || genpd->resume_count > 0 || genpd->prepared_count > 0) |
f721889f RW |
361 | return 0; |
362 | ||
c4bb3160 | 363 | if (atomic_read(&genpd->sd_count) > 0) |
f721889f RW |
364 | return -EBUSY; |
365 | ||
366 | not_suspended = 0; | |
4605ab65 | 367 | list_for_each_entry(pdd, &genpd->dev_list, list_node) |
0aa2a221 | 368 | if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev) |
1e78a0c7 | 369 | || pdd->dev->power.irq_safe || to_gpd_data(pdd)->always_on)) |
f721889f RW |
370 | not_suspended++; |
371 | ||
372 | if (not_suspended > genpd->in_progress) | |
373 | return -EBUSY; | |
374 | ||
c6d22b37 RW |
375 | if (genpd->poweroff_task) { |
376 | /* | |
377 | * Another instance of pm_genpd_poweroff() is executing | |
378 | * callbacks, so tell it to start over and return. | |
379 | */ | |
380 | genpd->status = GPD_STATE_REPEAT; | |
381 | return 0; | |
382 | } | |
383 | ||
dd8683e9 | 384 | genpd->max_off_time_ns = -1; |
f721889f RW |
385 | if (genpd->gov && genpd->gov->power_down_ok) { |
386 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
387 | return -EAGAIN; | |
388 | } | |
389 | ||
17b75eca | 390 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 | 391 | genpd->poweroff_task = current; |
17b75eca | 392 | |
4605ab65 | 393 | list_for_each_entry_reverse(pdd, &genpd->dev_list, list_node) { |
3c07cbc4 | 394 | ret = atomic_read(&genpd->sd_count) == 0 ? |
4605ab65 | 395 | __pm_genpd_save_device(pdd, genpd) : -EBUSY; |
3f241775 RW |
396 | |
397 | if (genpd_abort_poweroff(genpd)) | |
398 | goto out; | |
399 | ||
697a7f37 RW |
400 | if (ret) { |
401 | genpd_set_active(genpd); | |
402 | goto out; | |
403 | } | |
f721889f | 404 | |
c6d22b37 RW |
405 | if (genpd->status == GPD_STATE_REPEAT) { |
406 | genpd->poweroff_task = NULL; | |
407 | goto start; | |
408 | } | |
409 | } | |
17b75eca | 410 | |
3c07cbc4 | 411 | if (genpd->power_off) { |
0140d8bd RW |
412 | ktime_t time_start; |
413 | s64 elapsed_ns; | |
414 | ||
3c07cbc4 RW |
415 | if (atomic_read(&genpd->sd_count) > 0) { |
416 | ret = -EBUSY; | |
c6d22b37 RW |
417 | goto out; |
418 | } | |
17b75eca | 419 | |
0140d8bd RW |
420 | time_start = ktime_get(); |
421 | ||
3c07cbc4 | 422 | /* |
5063ce15 RW |
423 | * If sd_count > 0 at this point, one of the subdomains hasn't |
424 | * managed to call pm_genpd_poweron() for the master yet after | |
3c07cbc4 RW |
425 | * incrementing it. In that case pm_genpd_poweron() will wait |
426 | * for us to drop the lock, so we can call .power_off() and let | |
427 | * the pm_genpd_poweron() restore power for us (this shouldn't | |
428 | * happen very often). | |
429 | */ | |
d2805402 RW |
430 | ret = genpd->power_off(genpd); |
431 | if (ret == -EBUSY) { | |
432 | genpd_set_active(genpd); | |
d2805402 RW |
433 | goto out; |
434 | } | |
0140d8bd RW |
435 | |
436 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
e84b2c20 | 437 | if (elapsed_ns > genpd->power_off_latency_ns) { |
0140d8bd | 438 | genpd->power_off_latency_ns = elapsed_ns; |
e84b2c20 RW |
439 | if (genpd->name) |
440 | pr_warning("%s: Power-off latency exceeded, " | |
441 | "new value %lld ns\n", genpd->name, | |
442 | elapsed_ns); | |
443 | } | |
d2805402 | 444 | } |
f721889f | 445 | |
17b75eca | 446 | genpd->status = GPD_STATE_POWER_OFF; |
221e9b58 | 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 | ||
1e78a0c7 RW |
496 | if (dev_gpd_data(dev)->always_on) |
497 | return -EBUSY; | |
498 | ||
a5bef810 | 499 | dev_gpd_data(dev)->td.effective_constraint_ns = -1; |
b02c999a RW |
500 | stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL; |
501 | if (stop_ok && !stop_ok(dev)) | |
502 | return -EBUSY; | |
503 | ||
d5e4cbfe RW |
504 | ret = genpd_stop_dev(genpd, dev); |
505 | if (ret) | |
506 | return ret; | |
17b75eca | 507 | |
0aa2a221 RW |
508 | /* |
509 | * If power.irq_safe is set, this routine will be run with interrupts | |
510 | * off, so it can't use mutexes. | |
511 | */ | |
512 | if (dev->power.irq_safe) | |
513 | return 0; | |
514 | ||
c6d22b37 | 515 | mutex_lock(&genpd->lock); |
f721889f RW |
516 | genpd->in_progress++; |
517 | pm_genpd_poweroff(genpd); | |
518 | genpd->in_progress--; | |
c6d22b37 | 519 | mutex_unlock(&genpd->lock); |
f721889f RW |
520 | |
521 | return 0; | |
522 | } | |
523 | ||
f721889f RW |
524 | /** |
525 | * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
526 | * @dev: Device to resume. | |
527 | * | |
528 | * Carry out a runtime resume of a device under the assumption that its | |
529 | * pm_domain field points to the domain member of an object of type | |
530 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
531 | */ | |
532 | static int pm_genpd_runtime_resume(struct device *dev) | |
533 | { | |
534 | struct generic_pm_domain *genpd; | |
c6d22b37 | 535 | DEFINE_WAIT(wait); |
f721889f RW |
536 | int ret; |
537 | ||
538 | dev_dbg(dev, "%s()\n", __func__); | |
539 | ||
5248051b RW |
540 | genpd = dev_to_genpd(dev); |
541 | if (IS_ERR(genpd)) | |
f721889f RW |
542 | return -EINVAL; |
543 | ||
0aa2a221 RW |
544 | might_sleep_if(!genpd->dev_irq_safe); |
545 | ||
546 | /* If power.irq_safe, the PM domain is never powered off. */ | |
547 | if (dev->power.irq_safe) | |
548 | goto out; | |
549 | ||
c6d22b37 | 550 | mutex_lock(&genpd->lock); |
3f241775 RW |
551 | ret = __pm_genpd_poweron(genpd); |
552 | if (ret) { | |
553 | mutex_unlock(&genpd->lock); | |
554 | return ret; | |
555 | } | |
17b75eca | 556 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 RW |
557 | genpd->resume_count++; |
558 | for (;;) { | |
559 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
560 | TASK_UNINTERRUPTIBLE); | |
561 | /* | |
562 | * If current is the powering off task, we have been called | |
563 | * reentrantly from one of the device callbacks, so we should | |
564 | * not wait. | |
565 | */ | |
566 | if (!genpd->poweroff_task || genpd->poweroff_task == current) | |
567 | break; | |
568 | mutex_unlock(&genpd->lock); | |
569 | ||
570 | schedule(); | |
571 | ||
572 | mutex_lock(&genpd->lock); | |
573 | } | |
574 | finish_wait(&genpd->status_wait_queue, &wait); | |
cd0ea672 | 575 | __pm_genpd_restore_device(dev->power.subsys_data->domain_data, genpd); |
c6d22b37 RW |
576 | genpd->resume_count--; |
577 | genpd_set_active(genpd); | |
17b75eca | 578 | wake_up_all(&genpd->status_wait_queue); |
c6d22b37 | 579 | mutex_unlock(&genpd->lock); |
17b75eca | 580 | |
0aa2a221 | 581 | out: |
d5e4cbfe | 582 | genpd_start_dev(genpd, dev); |
f721889f RW |
583 | |
584 | return 0; | |
585 | } | |
586 | ||
17f2ae7f RW |
587 | /** |
588 | * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use. | |
589 | */ | |
590 | void pm_genpd_poweroff_unused(void) | |
591 | { | |
592 | struct generic_pm_domain *genpd; | |
593 | ||
594 | mutex_lock(&gpd_list_lock); | |
595 | ||
596 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
597 | genpd_queue_power_off_work(genpd); | |
598 | ||
599 | mutex_unlock(&gpd_list_lock); | |
600 | } | |
601 | ||
f721889f RW |
602 | #else |
603 | ||
604 | static inline void genpd_power_off_work_fn(struct work_struct *work) {} | |
605 | ||
606 | #define pm_genpd_runtime_suspend NULL | |
607 | #define pm_genpd_runtime_resume NULL | |
608 | ||
609 | #endif /* CONFIG_PM_RUNTIME */ | |
610 | ||
596ba34b RW |
611 | #ifdef CONFIG_PM_SLEEP |
612 | ||
d5e4cbfe RW |
613 | static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd, |
614 | struct device *dev) | |
615 | { | |
616 | return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev); | |
617 | } | |
618 | ||
d23b9b00 RW |
619 | static int genpd_suspend_dev(struct generic_pm_domain *genpd, struct device *dev) |
620 | { | |
621 | return GENPD_DEV_CALLBACK(genpd, int, suspend, dev); | |
622 | } | |
623 | ||
624 | static int genpd_suspend_late(struct generic_pm_domain *genpd, struct device *dev) | |
625 | { | |
626 | return GENPD_DEV_CALLBACK(genpd, int, suspend_late, dev); | |
627 | } | |
628 | ||
629 | static int genpd_resume_early(struct generic_pm_domain *genpd, struct device *dev) | |
630 | { | |
631 | return GENPD_DEV_CALLBACK(genpd, int, resume_early, dev); | |
632 | } | |
633 | ||
634 | static int genpd_resume_dev(struct generic_pm_domain *genpd, struct device *dev) | |
635 | { | |
636 | return GENPD_DEV_CALLBACK(genpd, int, resume, dev); | |
637 | } | |
638 | ||
639 | static int genpd_freeze_dev(struct generic_pm_domain *genpd, struct device *dev) | |
640 | { | |
641 | return GENPD_DEV_CALLBACK(genpd, int, freeze, dev); | |
642 | } | |
643 | ||
644 | static int genpd_freeze_late(struct generic_pm_domain *genpd, struct device *dev) | |
645 | { | |
646 | return GENPD_DEV_CALLBACK(genpd, int, freeze_late, dev); | |
647 | } | |
648 | ||
649 | static int genpd_thaw_early(struct generic_pm_domain *genpd, struct device *dev) | |
650 | { | |
651 | return GENPD_DEV_CALLBACK(genpd, int, thaw_early, dev); | |
652 | } | |
653 | ||
654 | static int genpd_thaw_dev(struct generic_pm_domain *genpd, struct device *dev) | |
655 | { | |
656 | return GENPD_DEV_CALLBACK(genpd, int, thaw, dev); | |
657 | } | |
658 | ||
596ba34b | 659 | /** |
5063ce15 | 660 | * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters. |
596ba34b RW |
661 | * @genpd: PM domain to power off, if possible. |
662 | * | |
663 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 664 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b RW |
665 | * |
666 | * This function is only called in "noirq" stages of system power transitions, | |
667 | * so it need not acquire locks (all of the "noirq" callbacks are executed | |
668 | * sequentially, so it is guaranteed that it will never run twice in parallel). | |
669 | */ | |
670 | static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd) | |
671 | { | |
5063ce15 | 672 | struct gpd_link *link; |
596ba34b | 673 | |
17b75eca | 674 | if (genpd->status == GPD_STATE_POWER_OFF) |
596ba34b RW |
675 | return; |
676 | ||
c4bb3160 RW |
677 | if (genpd->suspended_count != genpd->device_count |
678 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
679 | return; |
680 | ||
681 | if (genpd->power_off) | |
682 | genpd->power_off(genpd); | |
683 | ||
17b75eca | 684 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
685 | |
686 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
687 | genpd_sd_counter_dec(link->master); | |
688 | pm_genpd_sync_poweroff(link->master); | |
596ba34b RW |
689 | } |
690 | } | |
691 | ||
4ecd6e65 RW |
692 | /** |
693 | * resume_needed - Check whether to resume a device before system suspend. | |
694 | * @dev: Device to check. | |
695 | * @genpd: PM domain the device belongs to. | |
696 | * | |
697 | * There are two cases in which a device that can wake up the system from sleep | |
698 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled | |
699 | * to wake up the system and it has to remain active for this purpose while the | |
700 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
701 | * the system from sleep states and it generally doesn't generate wakeup signals | |
702 | * by itself (those signals are generated on its behalf by other parts of the | |
703 | * system). In the latter case it may be necessary to reconfigure the device's | |
704 | * wakeup settings during system suspend, because it may have been set up to | |
705 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
706 | * Return 'true' in either of the above cases. | |
707 | */ | |
708 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) | |
709 | { | |
710 | bool active_wakeup; | |
711 | ||
712 | if (!device_can_wakeup(dev)) | |
713 | return false; | |
714 | ||
d5e4cbfe | 715 | active_wakeup = genpd_dev_active_wakeup(genpd, dev); |
4ecd6e65 RW |
716 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
717 | } | |
718 | ||
596ba34b RW |
719 | /** |
720 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
721 | * @dev: Device to start the transition of. | |
722 | * | |
723 | * Start a power transition of a device (during a system-wide power transition) | |
724 | * under the assumption that its pm_domain field points to the domain member of | |
725 | * an object of type struct generic_pm_domain representing a PM domain | |
726 | * consisting of I/O devices. | |
727 | */ | |
728 | static int pm_genpd_prepare(struct device *dev) | |
729 | { | |
730 | struct generic_pm_domain *genpd; | |
b6c10c84 | 731 | int ret; |
596ba34b RW |
732 | |
733 | dev_dbg(dev, "%s()\n", __func__); | |
734 | ||
735 | genpd = dev_to_genpd(dev); | |
736 | if (IS_ERR(genpd)) | |
737 | return -EINVAL; | |
738 | ||
17b75eca RW |
739 | /* |
740 | * If a wakeup request is pending for the device, it should be woken up | |
741 | * at this point and a system wakeup event should be reported if it's | |
742 | * set up to wake up the system from sleep states. | |
743 | */ | |
744 | pm_runtime_get_noresume(dev); | |
745 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) | |
746 | pm_wakeup_event(dev, 0); | |
747 | ||
748 | if (pm_wakeup_pending()) { | |
749 | pm_runtime_put_sync(dev); | |
750 | return -EBUSY; | |
751 | } | |
752 | ||
4ecd6e65 RW |
753 | if (resume_needed(dev, genpd)) |
754 | pm_runtime_resume(dev); | |
755 | ||
17b75eca | 756 | genpd_acquire_lock(genpd); |
596ba34b | 757 | |
65533bbf RW |
758 | if (genpd->prepared_count++ == 0) { |
759 | genpd->suspended_count = 0; | |
17b75eca | 760 | genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; |
65533bbf | 761 | } |
17b75eca RW |
762 | |
763 | genpd_release_lock(genpd); | |
596ba34b RW |
764 | |
765 | if (genpd->suspend_power_off) { | |
17b75eca | 766 | pm_runtime_put_noidle(dev); |
596ba34b RW |
767 | return 0; |
768 | } | |
769 | ||
770 | /* | |
17b75eca RW |
771 | * The PM domain must be in the GPD_STATE_ACTIVE state at this point, |
772 | * so pm_genpd_poweron() will return immediately, but if the device | |
d5e4cbfe | 773 | * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need |
17b75eca | 774 | * to make it operational. |
596ba34b | 775 | */ |
17b75eca | 776 | pm_runtime_resume(dev); |
596ba34b RW |
777 | __pm_runtime_disable(dev, false); |
778 | ||
b6c10c84 RW |
779 | ret = pm_generic_prepare(dev); |
780 | if (ret) { | |
781 | mutex_lock(&genpd->lock); | |
782 | ||
783 | if (--genpd->prepared_count == 0) | |
784 | genpd->suspend_power_off = false; | |
785 | ||
786 | mutex_unlock(&genpd->lock); | |
17b75eca | 787 | pm_runtime_enable(dev); |
b6c10c84 | 788 | } |
17b75eca RW |
789 | |
790 | pm_runtime_put_sync(dev); | |
b6c10c84 | 791 | return ret; |
596ba34b RW |
792 | } |
793 | ||
794 | /** | |
795 | * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. | |
796 | * @dev: Device to suspend. | |
797 | * | |
798 | * Suspend a device under the assumption that its pm_domain field points to the | |
799 | * domain member of an object of type struct generic_pm_domain representing | |
800 | * a PM domain consisting of I/O devices. | |
801 | */ | |
802 | static int pm_genpd_suspend(struct device *dev) | |
803 | { | |
804 | struct generic_pm_domain *genpd; | |
805 | ||
806 | dev_dbg(dev, "%s()\n", __func__); | |
807 | ||
808 | genpd = dev_to_genpd(dev); | |
809 | if (IS_ERR(genpd)) | |
810 | return -EINVAL; | |
811 | ||
d23b9b00 | 812 | return genpd->suspend_power_off ? 0 : genpd_suspend_dev(genpd, dev); |
596ba34b RW |
813 | } |
814 | ||
815 | /** | |
0496c8ae | 816 | * pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain. |
596ba34b RW |
817 | * @dev: Device to suspend. |
818 | * | |
819 | * Carry out a late suspend of a device under the assumption that its | |
820 | * pm_domain field points to the domain member of an object of type | |
821 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
822 | */ | |
0496c8ae | 823 | static int pm_genpd_suspend_late(struct device *dev) |
596ba34b RW |
824 | { |
825 | struct generic_pm_domain *genpd; | |
596ba34b RW |
826 | |
827 | dev_dbg(dev, "%s()\n", __func__); | |
828 | ||
829 | genpd = dev_to_genpd(dev); | |
830 | if (IS_ERR(genpd)) | |
831 | return -EINVAL; | |
832 | ||
0496c8ae RW |
833 | return genpd->suspend_power_off ? 0 : genpd_suspend_late(genpd, dev); |
834 | } | |
596ba34b | 835 | |
0496c8ae RW |
836 | /** |
837 | * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. | |
838 | * @dev: Device to suspend. | |
839 | * | |
840 | * Stop the device and remove power from the domain if all devices in it have | |
841 | * been stopped. | |
842 | */ | |
843 | static int pm_genpd_suspend_noirq(struct device *dev) | |
844 | { | |
845 | struct generic_pm_domain *genpd; | |
846 | ||
847 | dev_dbg(dev, "%s()\n", __func__); | |
848 | ||
849 | genpd = dev_to_genpd(dev); | |
850 | if (IS_ERR(genpd)) | |
851 | return -EINVAL; | |
596ba34b | 852 | |
1e78a0c7 | 853 | if (genpd->suspend_power_off || dev_gpd_data(dev)->always_on |
0496c8ae | 854 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
d4f2d87a RW |
855 | return 0; |
856 | ||
d5e4cbfe | 857 | genpd_stop_dev(genpd, dev); |
596ba34b RW |
858 | |
859 | /* | |
860 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
861 | * guaranteed that this function will never run twice in parallel for | |
862 | * the same PM domain, so it is not necessary to use locking here. | |
863 | */ | |
864 | genpd->suspended_count++; | |
865 | pm_genpd_sync_poweroff(genpd); | |
866 | ||
867 | return 0; | |
868 | } | |
869 | ||
870 | /** | |
0496c8ae | 871 | * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
872 | * @dev: Device to resume. |
873 | * | |
0496c8ae | 874 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b RW |
875 | */ |
876 | static int pm_genpd_resume_noirq(struct device *dev) | |
877 | { | |
878 | struct generic_pm_domain *genpd; | |
879 | ||
880 | dev_dbg(dev, "%s()\n", __func__); | |
881 | ||
882 | genpd = dev_to_genpd(dev); | |
883 | if (IS_ERR(genpd)) | |
884 | return -EINVAL; | |
885 | ||
1e78a0c7 | 886 | if (genpd->suspend_power_off || dev_gpd_data(dev)->always_on |
cc85b207 | 887 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
596ba34b RW |
888 | return 0; |
889 | ||
890 | /* | |
891 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
892 | * guaranteed that this function will never run twice in parallel for | |
893 | * the same PM domain, so it is not necessary to use locking here. | |
894 | */ | |
895 | pm_genpd_poweron(genpd); | |
896 | genpd->suspended_count--; | |
596ba34b | 897 | |
0496c8ae | 898 | return genpd_start_dev(genpd, dev); |
596ba34b RW |
899 | } |
900 | ||
901 | /** | |
0496c8ae RW |
902 | * pm_genpd_resume_early - Early resume of a device in an I/O PM domain. |
903 | * @dev: Device to resume. | |
904 | * | |
905 | * Carry out an early resume of a device under the assumption that its | |
906 | * pm_domain field points to the domain member of an object of type | |
907 | * struct generic_pm_domain representing a power domain consisting of I/O | |
908 | * devices. | |
909 | */ | |
910 | static int pm_genpd_resume_early(struct device *dev) | |
911 | { | |
912 | struct generic_pm_domain *genpd; | |
913 | ||
914 | dev_dbg(dev, "%s()\n", __func__); | |
915 | ||
916 | genpd = dev_to_genpd(dev); | |
917 | if (IS_ERR(genpd)) | |
918 | return -EINVAL; | |
919 | ||
920 | return genpd->suspend_power_off ? 0 : genpd_resume_early(genpd, dev); | |
921 | } | |
922 | ||
923 | /** | |
924 | * pm_genpd_resume - Resume of device in an I/O PM domain. | |
596ba34b RW |
925 | * @dev: Device to resume. |
926 | * | |
927 | * Resume a device under the assumption that its pm_domain field points to the | |
928 | * domain member of an object of type struct generic_pm_domain representing | |
929 | * a power domain consisting of I/O devices. | |
930 | */ | |
931 | static int pm_genpd_resume(struct device *dev) | |
932 | { | |
933 | struct generic_pm_domain *genpd; | |
934 | ||
935 | dev_dbg(dev, "%s()\n", __func__); | |
936 | ||
937 | genpd = dev_to_genpd(dev); | |
938 | if (IS_ERR(genpd)) | |
939 | return -EINVAL; | |
940 | ||
d23b9b00 | 941 | return genpd->suspend_power_off ? 0 : genpd_resume_dev(genpd, dev); |
596ba34b RW |
942 | } |
943 | ||
944 | /** | |
0496c8ae | 945 | * pm_genpd_freeze - Freezing a device in an I/O PM domain. |
596ba34b RW |
946 | * @dev: Device to freeze. |
947 | * | |
948 | * Freeze a device under the assumption that its pm_domain field points to the | |
949 | * domain member of an object of type struct generic_pm_domain representing | |
950 | * a power domain consisting of I/O devices. | |
951 | */ | |
952 | static int pm_genpd_freeze(struct device *dev) | |
953 | { | |
954 | struct generic_pm_domain *genpd; | |
955 | ||
956 | dev_dbg(dev, "%s()\n", __func__); | |
957 | ||
958 | genpd = dev_to_genpd(dev); | |
959 | if (IS_ERR(genpd)) | |
960 | return -EINVAL; | |
961 | ||
d23b9b00 | 962 | return genpd->suspend_power_off ? 0 : genpd_freeze_dev(genpd, dev); |
596ba34b RW |
963 | } |
964 | ||
965 | /** | |
0496c8ae RW |
966 | * pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain. |
967 | * @dev: Device to freeze. | |
968 | * | |
969 | * Carry out a late freeze of a device under the assumption that its | |
970 | * pm_domain field points to the domain member of an object of type | |
971 | * struct generic_pm_domain representing a power domain consisting of I/O | |
972 | * devices. | |
973 | */ | |
974 | static int pm_genpd_freeze_late(struct device *dev) | |
975 | { | |
976 | struct generic_pm_domain *genpd; | |
977 | ||
978 | dev_dbg(dev, "%s()\n", __func__); | |
979 | ||
980 | genpd = dev_to_genpd(dev); | |
981 | if (IS_ERR(genpd)) | |
982 | return -EINVAL; | |
983 | ||
984 | return genpd->suspend_power_off ? 0 : genpd_freeze_late(genpd, dev); | |
985 | } | |
986 | ||
987 | /** | |
988 | * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. | |
596ba34b RW |
989 | * @dev: Device to freeze. |
990 | * | |
991 | * Carry out a late freeze of a device under the assumption that its | |
992 | * pm_domain field points to the domain member of an object of type | |
993 | * struct generic_pm_domain representing a power domain consisting of I/O | |
994 | * devices. | |
995 | */ | |
996 | static int pm_genpd_freeze_noirq(struct device *dev) | |
997 | { | |
998 | struct generic_pm_domain *genpd; | |
596ba34b RW |
999 | |
1000 | dev_dbg(dev, "%s()\n", __func__); | |
1001 | ||
1002 | genpd = dev_to_genpd(dev); | |
1003 | if (IS_ERR(genpd)) | |
1004 | return -EINVAL; | |
1005 | ||
1e78a0c7 RW |
1006 | return genpd->suspend_power_off || dev_gpd_data(dev)->always_on ? |
1007 | 0 : genpd_stop_dev(genpd, dev); | |
0496c8ae | 1008 | } |
596ba34b | 1009 | |
0496c8ae RW |
1010 | /** |
1011 | * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain. | |
1012 | * @dev: Device to thaw. | |
1013 | * | |
1014 | * Start the device, unless power has been removed from the domain already | |
1015 | * before the system transition. | |
1016 | */ | |
1017 | static int pm_genpd_thaw_noirq(struct device *dev) | |
1018 | { | |
1019 | struct generic_pm_domain *genpd; | |
596ba34b | 1020 | |
0496c8ae | 1021 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 1022 | |
0496c8ae RW |
1023 | genpd = dev_to_genpd(dev); |
1024 | if (IS_ERR(genpd)) | |
1025 | return -EINVAL; | |
1026 | ||
1e78a0c7 RW |
1027 | return genpd->suspend_power_off || dev_gpd_data(dev)->always_on ? |
1028 | 0 : genpd_start_dev(genpd, dev); | |
596ba34b RW |
1029 | } |
1030 | ||
1031 | /** | |
0496c8ae | 1032 | * pm_genpd_thaw_early - Early thaw of device in an I/O PM domain. |
596ba34b RW |
1033 | * @dev: Device to thaw. |
1034 | * | |
1035 | * Carry out an early thaw of a device under the assumption that its | |
1036 | * pm_domain field points to the domain member of an object of type | |
1037 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1038 | * devices. | |
1039 | */ | |
0496c8ae | 1040 | static int pm_genpd_thaw_early(struct device *dev) |
596ba34b RW |
1041 | { |
1042 | struct generic_pm_domain *genpd; | |
1043 | ||
1044 | dev_dbg(dev, "%s()\n", __func__); | |
1045 | ||
1046 | genpd = dev_to_genpd(dev); | |
1047 | if (IS_ERR(genpd)) | |
1048 | return -EINVAL; | |
1049 | ||
0496c8ae | 1050 | return genpd->suspend_power_off ? 0 : genpd_thaw_early(genpd, dev); |
596ba34b RW |
1051 | } |
1052 | ||
1053 | /** | |
1054 | * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. | |
1055 | * @dev: Device to thaw. | |
1056 | * | |
1057 | * Thaw a device 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 int pm_genpd_thaw(struct device *dev) | |
1062 | { | |
1063 | struct generic_pm_domain *genpd; | |
1064 | ||
1065 | dev_dbg(dev, "%s()\n", __func__); | |
1066 | ||
1067 | genpd = dev_to_genpd(dev); | |
1068 | if (IS_ERR(genpd)) | |
1069 | return -EINVAL; | |
1070 | ||
d23b9b00 | 1071 | return genpd->suspend_power_off ? 0 : genpd_thaw_dev(genpd, dev); |
596ba34b RW |
1072 | } |
1073 | ||
1074 | /** | |
0496c8ae | 1075 | * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1076 | * @dev: Device to resume. |
1077 | * | |
0496c8ae RW |
1078 | * Make sure the domain will be in the same power state as before the |
1079 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b RW |
1080 | */ |
1081 | static int pm_genpd_restore_noirq(struct device *dev) | |
1082 | { | |
1083 | struct generic_pm_domain *genpd; | |
1084 | ||
1085 | dev_dbg(dev, "%s()\n", __func__); | |
1086 | ||
1087 | genpd = dev_to_genpd(dev); | |
1088 | if (IS_ERR(genpd)) | |
1089 | return -EINVAL; | |
1090 | ||
1091 | /* | |
1092 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1093 | * guaranteed that this function will never run twice in parallel for | |
1094 | * the same PM domain, so it is not necessary to use locking here. | |
65533bbf RW |
1095 | * |
1096 | * At this point suspended_count == 0 means we are being run for the | |
1097 | * first time for the given domain in the present cycle. | |
596ba34b | 1098 | */ |
65533bbf | 1099 | if (genpd->suspended_count++ == 0) { |
596ba34b | 1100 | /* |
65533bbf RW |
1101 | * The boot kernel might put the domain into arbitrary state, |
1102 | * so make it appear as powered off to pm_genpd_poweron(), so | |
1103 | * that it tries to power it on in case it was really off. | |
596ba34b | 1104 | */ |
65533bbf RW |
1105 | genpd->status = GPD_STATE_POWER_OFF; |
1106 | if (genpd->suspend_power_off) { | |
1107 | /* | |
1108 | * If the domain was off before the hibernation, make | |
1109 | * sure it will be off going forward. | |
1110 | */ | |
1111 | if (genpd->power_off) | |
1112 | genpd->power_off(genpd); | |
1113 | ||
1114 | return 0; | |
1115 | } | |
596ba34b RW |
1116 | } |
1117 | ||
18dd2ece RW |
1118 | if (genpd->suspend_power_off) |
1119 | return 0; | |
1120 | ||
596ba34b | 1121 | pm_genpd_poweron(genpd); |
596ba34b | 1122 | |
1e78a0c7 | 1123 | return dev_gpd_data(dev)->always_on ? 0 : genpd_start_dev(genpd, dev); |
596ba34b RW |
1124 | } |
1125 | ||
1126 | /** | |
1127 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
1128 | * @dev: Device to complete the transition of. | |
1129 | * | |
1130 | * Complete a power transition of a device (during a system-wide power | |
1131 | * transition) under the assumption that its pm_domain field points to the | |
1132 | * domain member of an object of type struct generic_pm_domain representing | |
1133 | * a power domain consisting of I/O devices. | |
1134 | */ | |
1135 | static void pm_genpd_complete(struct device *dev) | |
1136 | { | |
1137 | struct generic_pm_domain *genpd; | |
1138 | bool run_complete; | |
1139 | ||
1140 | dev_dbg(dev, "%s()\n", __func__); | |
1141 | ||
1142 | genpd = dev_to_genpd(dev); | |
1143 | if (IS_ERR(genpd)) | |
1144 | return; | |
1145 | ||
1146 | mutex_lock(&genpd->lock); | |
1147 | ||
1148 | run_complete = !genpd->suspend_power_off; | |
1149 | if (--genpd->prepared_count == 0) | |
1150 | genpd->suspend_power_off = false; | |
1151 | ||
1152 | mutex_unlock(&genpd->lock); | |
1153 | ||
1154 | if (run_complete) { | |
1155 | pm_generic_complete(dev); | |
6f00ff78 | 1156 | pm_runtime_set_active(dev); |
596ba34b | 1157 | pm_runtime_enable(dev); |
6f00ff78 | 1158 | pm_runtime_idle(dev); |
596ba34b RW |
1159 | } |
1160 | } | |
1161 | ||
1162 | #else | |
1163 | ||
1164 | #define pm_genpd_prepare NULL | |
1165 | #define pm_genpd_suspend NULL | |
0496c8ae | 1166 | #define pm_genpd_suspend_late NULL |
596ba34b | 1167 | #define pm_genpd_suspend_noirq NULL |
0496c8ae | 1168 | #define pm_genpd_resume_early NULL |
596ba34b RW |
1169 | #define pm_genpd_resume_noirq NULL |
1170 | #define pm_genpd_resume NULL | |
1171 | #define pm_genpd_freeze NULL | |
0496c8ae | 1172 | #define pm_genpd_freeze_late NULL |
596ba34b | 1173 | #define pm_genpd_freeze_noirq NULL |
0496c8ae | 1174 | #define pm_genpd_thaw_early NULL |
596ba34b RW |
1175 | #define pm_genpd_thaw_noirq NULL |
1176 | #define pm_genpd_thaw NULL | |
596ba34b | 1177 | #define pm_genpd_restore_noirq NULL |
596ba34b RW |
1178 | #define pm_genpd_complete NULL |
1179 | ||
1180 | #endif /* CONFIG_PM_SLEEP */ | |
1181 | ||
f721889f | 1182 | /** |
b02c999a | 1183 | * __pm_genpd_add_device - Add a device to an I/O PM domain. |
f721889f RW |
1184 | * @genpd: PM domain to add the device to. |
1185 | * @dev: Device to be added. | |
b02c999a | 1186 | * @td: Set of PM QoS timing parameters to attach to the device. |
f721889f | 1187 | */ |
b02c999a RW |
1188 | int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1189 | struct gpd_timing_data *td) | |
f721889f | 1190 | { |
cd0ea672 | 1191 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1192 | struct pm_domain_data *pdd; |
f721889f RW |
1193 | int ret = 0; |
1194 | ||
1195 | dev_dbg(dev, "%s()\n", __func__); | |
1196 | ||
1197 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1198 | return -EINVAL; | |
1199 | ||
17b75eca | 1200 | genpd_acquire_lock(genpd); |
f721889f | 1201 | |
17b75eca | 1202 | if (genpd->status == GPD_STATE_POWER_OFF) { |
f721889f RW |
1203 | ret = -EINVAL; |
1204 | goto out; | |
1205 | } | |
1206 | ||
596ba34b RW |
1207 | if (genpd->prepared_count > 0) { |
1208 | ret = -EAGAIN; | |
1209 | goto out; | |
1210 | } | |
1211 | ||
4605ab65 RW |
1212 | list_for_each_entry(pdd, &genpd->dev_list, list_node) |
1213 | if (pdd->dev == dev) { | |
f721889f RW |
1214 | ret = -EINVAL; |
1215 | goto out; | |
1216 | } | |
1217 | ||
cd0ea672 RW |
1218 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); |
1219 | if (!gpd_data) { | |
1220 | ret = -ENOMEM; | |
1221 | goto out; | |
1222 | } | |
1223 | ||
596ba34b | 1224 | genpd->device_count++; |
f721889f | 1225 | |
f721889f | 1226 | dev->pm_domain = &genpd->domain; |
4605ab65 | 1227 | dev_pm_get_subsys_data(dev); |
cd0ea672 RW |
1228 | dev->power.subsys_data->domain_data = &gpd_data->base; |
1229 | gpd_data->base.dev = dev; | |
1230 | gpd_data->need_restore = false; | |
1231 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); | |
b02c999a RW |
1232 | if (td) |
1233 | gpd_data->td = *td; | |
f721889f RW |
1234 | |
1235 | out: | |
17b75eca | 1236 | genpd_release_lock(genpd); |
f721889f RW |
1237 | |
1238 | return ret; | |
1239 | } | |
1240 | ||
c8aa130b TA |
1241 | /** |
1242 | * __pm_genpd_of_add_device - Add a device to an I/O PM domain. | |
1243 | * @genpd_node: Device tree node pointer representing a PM domain to which the | |
1244 | * the device is added to. | |
1245 | * @dev: Device to be added. | |
1246 | * @td: Set of PM QoS timing parameters to attach to the device. | |
1247 | */ | |
1248 | int __pm_genpd_of_add_device(struct device_node *genpd_node, struct device *dev, | |
1249 | struct gpd_timing_data *td) | |
1250 | { | |
1251 | struct generic_pm_domain *genpd = NULL, *gpd; | |
1252 | ||
1253 | dev_dbg(dev, "%s()\n", __func__); | |
1254 | ||
1255 | if (IS_ERR_OR_NULL(genpd_node) || IS_ERR_OR_NULL(dev)) | |
1256 | return -EINVAL; | |
1257 | ||
1258 | mutex_lock(&gpd_list_lock); | |
1259 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
1260 | if (gpd->of_node == genpd_node) { | |
1261 | genpd = gpd; | |
1262 | break; | |
1263 | } | |
1264 | } | |
1265 | mutex_unlock(&gpd_list_lock); | |
1266 | ||
1267 | if (!genpd) | |
1268 | return -EINVAL; | |
1269 | ||
1270 | return __pm_genpd_add_device(genpd, dev, td); | |
1271 | } | |
1272 | ||
f721889f RW |
1273 | /** |
1274 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1275 | * @genpd: PM domain to remove the device from. | |
1276 | * @dev: Device to be removed. | |
1277 | */ | |
1278 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1279 | struct device *dev) | |
1280 | { | |
4605ab65 | 1281 | struct pm_domain_data *pdd; |
efa69025 | 1282 | int ret = 0; |
f721889f RW |
1283 | |
1284 | dev_dbg(dev, "%s()\n", __func__); | |
1285 | ||
efa69025 RW |
1286 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev) |
1287 | || IS_ERR_OR_NULL(dev->pm_domain) | |
1288 | || pd_to_genpd(dev->pm_domain) != genpd) | |
f721889f RW |
1289 | return -EINVAL; |
1290 | ||
17b75eca | 1291 | genpd_acquire_lock(genpd); |
f721889f | 1292 | |
596ba34b RW |
1293 | if (genpd->prepared_count > 0) { |
1294 | ret = -EAGAIN; | |
1295 | goto out; | |
1296 | } | |
1297 | ||
efa69025 RW |
1298 | dev->pm_domain = NULL; |
1299 | pdd = dev->power.subsys_data->domain_data; | |
1300 | list_del_init(&pdd->list_node); | |
1301 | dev->power.subsys_data->domain_data = NULL; | |
1302 | dev_pm_put_subsys_data(dev); | |
1303 | kfree(to_gpd_data(pdd)); | |
f721889f | 1304 | |
efa69025 | 1305 | genpd->device_count--; |
f721889f | 1306 | |
596ba34b | 1307 | out: |
17b75eca | 1308 | genpd_release_lock(genpd); |
f721889f RW |
1309 | |
1310 | return ret; | |
1311 | } | |
1312 | ||
1e78a0c7 RW |
1313 | /** |
1314 | * pm_genpd_dev_always_on - Set/unset the "always on" flag for a given device. | |
1315 | * @dev: Device to set/unset the flag for. | |
1316 | * @val: The new value of the device's "always on" flag. | |
1317 | */ | |
1318 | void pm_genpd_dev_always_on(struct device *dev, bool val) | |
1319 | { | |
1320 | struct pm_subsys_data *psd; | |
1321 | unsigned long flags; | |
1322 | ||
1323 | spin_lock_irqsave(&dev->power.lock, flags); | |
1324 | ||
1325 | psd = dev_to_psd(dev); | |
1326 | if (psd && psd->domain_data) | |
1327 | to_gpd_data(psd->domain_data)->always_on = val; | |
1328 | ||
1329 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
1330 | } | |
1331 | EXPORT_SYMBOL_GPL(pm_genpd_dev_always_on); | |
1332 | ||
f721889f RW |
1333 | /** |
1334 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1335 | * @genpd: Master PM domain to add the subdomain to. | |
bc0403ff | 1336 | * @subdomain: Subdomain to be added. |
f721889f RW |
1337 | */ |
1338 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
bc0403ff | 1339 | struct generic_pm_domain *subdomain) |
f721889f | 1340 | { |
5063ce15 | 1341 | struct gpd_link *link; |
f721889f RW |
1342 | int ret = 0; |
1343 | ||
bc0403ff | 1344 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1345 | return -EINVAL; |
1346 | ||
17b75eca RW |
1347 | start: |
1348 | genpd_acquire_lock(genpd); | |
bc0403ff | 1349 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); |
f721889f | 1350 | |
bc0403ff RW |
1351 | if (subdomain->status != GPD_STATE_POWER_OFF |
1352 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1353 | mutex_unlock(&subdomain->lock); | |
17b75eca RW |
1354 | genpd_release_lock(genpd); |
1355 | goto start; | |
1356 | } | |
1357 | ||
1358 | if (genpd->status == GPD_STATE_POWER_OFF | |
bc0403ff | 1359 | && subdomain->status != GPD_STATE_POWER_OFF) { |
f721889f RW |
1360 | ret = -EINVAL; |
1361 | goto out; | |
1362 | } | |
1363 | ||
5063ce15 | 1364 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
bc0403ff | 1365 | if (link->slave == subdomain && link->master == genpd) { |
f721889f RW |
1366 | ret = -EINVAL; |
1367 | goto out; | |
1368 | } | |
1369 | } | |
1370 | ||
5063ce15 RW |
1371 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1372 | if (!link) { | |
1373 | ret = -ENOMEM; | |
1374 | goto out; | |
1375 | } | |
1376 | link->master = genpd; | |
1377 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1378 | link->slave = subdomain; |
1379 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
1380 | if (subdomain->status != GPD_STATE_POWER_OFF) | |
c4bb3160 | 1381 | genpd_sd_counter_inc(genpd); |
f721889f | 1382 | |
f721889f | 1383 | out: |
bc0403ff | 1384 | mutex_unlock(&subdomain->lock); |
17b75eca | 1385 | genpd_release_lock(genpd); |
f721889f RW |
1386 | |
1387 | return ret; | |
1388 | } | |
1389 | ||
1390 | /** | |
1391 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1392 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1393 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1394 | */ |
1395 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1396 | struct generic_pm_domain *subdomain) |
f721889f | 1397 | { |
5063ce15 | 1398 | struct gpd_link *link; |
f721889f RW |
1399 | int ret = -EINVAL; |
1400 | ||
5063ce15 | 1401 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1402 | return -EINVAL; |
1403 | ||
17b75eca RW |
1404 | start: |
1405 | genpd_acquire_lock(genpd); | |
f721889f | 1406 | |
5063ce15 RW |
1407 | list_for_each_entry(link, &genpd->master_links, master_node) { |
1408 | if (link->slave != subdomain) | |
f721889f RW |
1409 | continue; |
1410 | ||
1411 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); | |
1412 | ||
17b75eca RW |
1413 | if (subdomain->status != GPD_STATE_POWER_OFF |
1414 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1415 | mutex_unlock(&subdomain->lock); | |
1416 | genpd_release_lock(genpd); | |
1417 | goto start; | |
1418 | } | |
1419 | ||
5063ce15 RW |
1420 | list_del(&link->master_node); |
1421 | list_del(&link->slave_node); | |
1422 | kfree(link); | |
17b75eca | 1423 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1424 | genpd_sd_counter_dec(genpd); |
1425 | ||
1426 | mutex_unlock(&subdomain->lock); | |
1427 | ||
1428 | ret = 0; | |
1429 | break; | |
1430 | } | |
1431 | ||
17b75eca | 1432 | genpd_release_lock(genpd); |
f721889f RW |
1433 | |
1434 | return ret; | |
1435 | } | |
1436 | ||
d5e4cbfe RW |
1437 | /** |
1438 | * pm_genpd_add_callbacks - Add PM domain callbacks to a given device. | |
1439 | * @dev: Device to add the callbacks to. | |
1440 | * @ops: Set of callbacks to add. | |
b02c999a | 1441 | * @td: Timing data to add to the device along with the callbacks (optional). |
d5e4cbfe | 1442 | */ |
b02c999a RW |
1443 | int pm_genpd_add_callbacks(struct device *dev, struct gpd_dev_ops *ops, |
1444 | struct gpd_timing_data *td) | |
d5e4cbfe RW |
1445 | { |
1446 | struct pm_domain_data *pdd; | |
1447 | int ret = 0; | |
1448 | ||
1449 | if (!(dev && dev->power.subsys_data && ops)) | |
1450 | return -EINVAL; | |
1451 | ||
1452 | pm_runtime_disable(dev); | |
1453 | device_pm_lock(); | |
1454 | ||
1455 | pdd = dev->power.subsys_data->domain_data; | |
1456 | if (pdd) { | |
1457 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); | |
1458 | ||
1459 | gpd_data->ops = *ops; | |
b02c999a RW |
1460 | if (td) |
1461 | gpd_data->td = *td; | |
d5e4cbfe RW |
1462 | } else { |
1463 | ret = -EINVAL; | |
1464 | } | |
1465 | ||
1466 | device_pm_unlock(); | |
1467 | pm_runtime_enable(dev); | |
1468 | ||
1469 | return ret; | |
1470 | } | |
1471 | EXPORT_SYMBOL_GPL(pm_genpd_add_callbacks); | |
1472 | ||
1473 | /** | |
b02c999a | 1474 | * __pm_genpd_remove_callbacks - Remove PM domain callbacks from a given device. |
d5e4cbfe | 1475 | * @dev: Device to remove the callbacks from. |
b02c999a | 1476 | * @clear_td: If set, clear the device's timing data too. |
d5e4cbfe | 1477 | */ |
b02c999a | 1478 | int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td) |
d5e4cbfe RW |
1479 | { |
1480 | struct pm_domain_data *pdd; | |
1481 | int ret = 0; | |
1482 | ||
1483 | if (!(dev && dev->power.subsys_data)) | |
1484 | return -EINVAL; | |
1485 | ||
1486 | pm_runtime_disable(dev); | |
1487 | device_pm_lock(); | |
1488 | ||
1489 | pdd = dev->power.subsys_data->domain_data; | |
1490 | if (pdd) { | |
1491 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); | |
1492 | ||
1493 | gpd_data->ops = (struct gpd_dev_ops){ 0 }; | |
b02c999a RW |
1494 | if (clear_td) |
1495 | gpd_data->td = (struct gpd_timing_data){ 0 }; | |
d5e4cbfe RW |
1496 | } else { |
1497 | ret = -EINVAL; | |
1498 | } | |
1499 | ||
1500 | device_pm_unlock(); | |
1501 | pm_runtime_enable(dev); | |
1502 | ||
1503 | return ret; | |
1504 | } | |
b02c999a | 1505 | EXPORT_SYMBOL_GPL(__pm_genpd_remove_callbacks); |
d5e4cbfe | 1506 | |
d23b9b00 RW |
1507 | /* Default device callbacks for generic PM domains. */ |
1508 | ||
ecf00475 RW |
1509 | /** |
1510 | * pm_genpd_default_save_state - Default "save device state" for PM domians. | |
1511 | * @dev: Device to handle. | |
1512 | */ | |
1513 | static int pm_genpd_default_save_state(struct device *dev) | |
1514 | { | |
1515 | int (*cb)(struct device *__dev); | |
1516 | struct device_driver *drv = dev->driver; | |
1517 | ||
1518 | cb = dev_gpd_data(dev)->ops.save_state; | |
1519 | if (cb) | |
1520 | return cb(dev); | |
1521 | ||
1522 | if (drv && drv->pm && drv->pm->runtime_suspend) | |
1523 | return drv->pm->runtime_suspend(dev); | |
1524 | ||
1525 | return 0; | |
1526 | } | |
1527 | ||
1528 | /** | |
1529 | * pm_genpd_default_restore_state - Default PM domians "restore device state". | |
1530 | * @dev: Device to handle. | |
1531 | */ | |
1532 | static int pm_genpd_default_restore_state(struct device *dev) | |
1533 | { | |
1534 | int (*cb)(struct device *__dev); | |
1535 | struct device_driver *drv = dev->driver; | |
1536 | ||
1537 | cb = dev_gpd_data(dev)->ops.restore_state; | |
1538 | if (cb) | |
1539 | return cb(dev); | |
1540 | ||
1541 | if (drv && drv->pm && drv->pm->runtime_resume) | |
1542 | return drv->pm->runtime_resume(dev); | |
1543 | ||
1544 | return 0; | |
1545 | } | |
1546 | ||
0f1d6986 RW |
1547 | #ifdef CONFIG_PM_SLEEP |
1548 | ||
d23b9b00 RW |
1549 | /** |
1550 | * pm_genpd_default_suspend - Default "device suspend" for PM domians. | |
1551 | * @dev: Device to handle. | |
1552 | */ | |
1553 | static int pm_genpd_default_suspend(struct device *dev) | |
1554 | { | |
c9914854 | 1555 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.suspend; |
d23b9b00 RW |
1556 | |
1557 | return cb ? cb(dev) : pm_generic_suspend(dev); | |
1558 | } | |
1559 | ||
1560 | /** | |
1561 | * pm_genpd_default_suspend_late - Default "late device suspend" for PM domians. | |
1562 | * @dev: Device to handle. | |
1563 | */ | |
1564 | static int pm_genpd_default_suspend_late(struct device *dev) | |
1565 | { | |
c9914854 | 1566 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.suspend_late; |
d23b9b00 | 1567 | |
0496c8ae | 1568 | return cb ? cb(dev) : pm_generic_suspend_late(dev); |
d23b9b00 RW |
1569 | } |
1570 | ||
1571 | /** | |
1572 | * pm_genpd_default_resume_early - Default "early device resume" for PM domians. | |
1573 | * @dev: Device to handle. | |
1574 | */ | |
1575 | static int pm_genpd_default_resume_early(struct device *dev) | |
1576 | { | |
c9914854 | 1577 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.resume_early; |
d23b9b00 | 1578 | |
0496c8ae | 1579 | return cb ? cb(dev) : pm_generic_resume_early(dev); |
d23b9b00 RW |
1580 | } |
1581 | ||
1582 | /** | |
1583 | * pm_genpd_default_resume - Default "device resume" for PM domians. | |
1584 | * @dev: Device to handle. | |
1585 | */ | |
1586 | static int pm_genpd_default_resume(struct device *dev) | |
1587 | { | |
c9914854 | 1588 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.resume; |
d23b9b00 RW |
1589 | |
1590 | return cb ? cb(dev) : pm_generic_resume(dev); | |
1591 | } | |
1592 | ||
1593 | /** | |
1594 | * pm_genpd_default_freeze - Default "device freeze" for PM domians. | |
1595 | * @dev: Device to handle. | |
1596 | */ | |
1597 | static int pm_genpd_default_freeze(struct device *dev) | |
1598 | { | |
1599 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze; | |
1600 | ||
1601 | return cb ? cb(dev) : pm_generic_freeze(dev); | |
1602 | } | |
1603 | ||
1604 | /** | |
1605 | * pm_genpd_default_freeze_late - Default "late device freeze" for PM domians. | |
1606 | * @dev: Device to handle. | |
1607 | */ | |
1608 | static int pm_genpd_default_freeze_late(struct device *dev) | |
1609 | { | |
1610 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze_late; | |
1611 | ||
0496c8ae | 1612 | return cb ? cb(dev) : pm_generic_freeze_late(dev); |
d23b9b00 RW |
1613 | } |
1614 | ||
1615 | /** | |
1616 | * pm_genpd_default_thaw_early - Default "early device thaw" for PM domians. | |
1617 | * @dev: Device to handle. | |
1618 | */ | |
1619 | static int pm_genpd_default_thaw_early(struct device *dev) | |
1620 | { | |
1621 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw_early; | |
1622 | ||
0496c8ae | 1623 | return cb ? cb(dev) : pm_generic_thaw_early(dev); |
d23b9b00 RW |
1624 | } |
1625 | ||
1626 | /** | |
1627 | * pm_genpd_default_thaw - Default "device thaw" for PM domians. | |
1628 | * @dev: Device to handle. | |
1629 | */ | |
1630 | static int pm_genpd_default_thaw(struct device *dev) | |
1631 | { | |
1632 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw; | |
1633 | ||
1634 | return cb ? cb(dev) : pm_generic_thaw(dev); | |
1635 | } | |
1636 | ||
0f1d6986 RW |
1637 | #else /* !CONFIG_PM_SLEEP */ |
1638 | ||
1639 | #define pm_genpd_default_suspend NULL | |
1640 | #define pm_genpd_default_suspend_late NULL | |
1641 | #define pm_genpd_default_resume_early NULL | |
1642 | #define pm_genpd_default_resume NULL | |
1643 | #define pm_genpd_default_freeze NULL | |
1644 | #define pm_genpd_default_freeze_late NULL | |
1645 | #define pm_genpd_default_thaw_early NULL | |
1646 | #define pm_genpd_default_thaw NULL | |
1647 | ||
1648 | #endif /* !CONFIG_PM_SLEEP */ | |
1649 | ||
f721889f RW |
1650 | /** |
1651 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1652 | * @genpd: PM domain object to initialize. | |
1653 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1654 | * @is_off: Initial value of the domain's power_is_off field. | |
1655 | */ | |
1656 | void pm_genpd_init(struct generic_pm_domain *genpd, | |
1657 | struct dev_power_governor *gov, bool is_off) | |
1658 | { | |
1659 | if (IS_ERR_OR_NULL(genpd)) | |
1660 | return; | |
1661 | ||
5063ce15 RW |
1662 | INIT_LIST_HEAD(&genpd->master_links); |
1663 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1664 | INIT_LIST_HEAD(&genpd->dev_list); |
f721889f RW |
1665 | mutex_init(&genpd->lock); |
1666 | genpd->gov = gov; | |
1667 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
1668 | genpd->in_progress = 0; | |
c4bb3160 | 1669 | atomic_set(&genpd->sd_count, 0); |
17b75eca RW |
1670 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
1671 | init_waitqueue_head(&genpd->status_wait_queue); | |
c6d22b37 RW |
1672 | genpd->poweroff_task = NULL; |
1673 | genpd->resume_count = 0; | |
596ba34b | 1674 | genpd->device_count = 0; |
221e9b58 | 1675 | genpd->max_off_time_ns = -1; |
f721889f RW |
1676 | genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; |
1677 | genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; | |
1678 | genpd->domain.ops.runtime_idle = pm_generic_runtime_idle; | |
596ba34b RW |
1679 | genpd->domain.ops.prepare = pm_genpd_prepare; |
1680 | genpd->domain.ops.suspend = pm_genpd_suspend; | |
0496c8ae | 1681 | genpd->domain.ops.suspend_late = pm_genpd_suspend_late; |
596ba34b RW |
1682 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; |
1683 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; | |
0496c8ae | 1684 | genpd->domain.ops.resume_early = pm_genpd_resume_early; |
596ba34b RW |
1685 | genpd->domain.ops.resume = pm_genpd_resume; |
1686 | genpd->domain.ops.freeze = pm_genpd_freeze; | |
0496c8ae | 1687 | genpd->domain.ops.freeze_late = pm_genpd_freeze_late; |
596ba34b RW |
1688 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; |
1689 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; | |
0496c8ae | 1690 | genpd->domain.ops.thaw_early = pm_genpd_thaw_early; |
596ba34b | 1691 | genpd->domain.ops.thaw = pm_genpd_thaw; |
d23b9b00 | 1692 | genpd->domain.ops.poweroff = pm_genpd_suspend; |
0496c8ae | 1693 | genpd->domain.ops.poweroff_late = pm_genpd_suspend_late; |
d23b9b00 | 1694 | genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq; |
596ba34b | 1695 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; |
0496c8ae | 1696 | genpd->domain.ops.restore_early = pm_genpd_resume_early; |
d23b9b00 | 1697 | genpd->domain.ops.restore = pm_genpd_resume; |
596ba34b | 1698 | genpd->domain.ops.complete = pm_genpd_complete; |
ecf00475 RW |
1699 | genpd->dev_ops.save_state = pm_genpd_default_save_state; |
1700 | genpd->dev_ops.restore_state = pm_genpd_default_restore_state; | |
c9914854 RW |
1701 | genpd->dev_ops.suspend = pm_genpd_default_suspend; |
1702 | genpd->dev_ops.suspend_late = pm_genpd_default_suspend_late; | |
1703 | genpd->dev_ops.resume_early = pm_genpd_default_resume_early; | |
1704 | genpd->dev_ops.resume = pm_genpd_default_resume; | |
d23b9b00 RW |
1705 | genpd->dev_ops.freeze = pm_genpd_default_freeze; |
1706 | genpd->dev_ops.freeze_late = pm_genpd_default_freeze_late; | |
1707 | genpd->dev_ops.thaw_early = pm_genpd_default_thaw_early; | |
1708 | genpd->dev_ops.thaw = pm_genpd_default_thaw; | |
5125bbf3 RW |
1709 | mutex_lock(&gpd_list_lock); |
1710 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1711 | mutex_unlock(&gpd_list_lock); | |
1712 | } |