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 | ||
f721889f RW |
384 | if (genpd->gov && genpd->gov->power_down_ok) { |
385 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
386 | return -EAGAIN; | |
387 | } | |
388 | ||
17b75eca | 389 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 | 390 | genpd->poweroff_task = current; |
17b75eca | 391 | |
4605ab65 | 392 | list_for_each_entry_reverse(pdd, &genpd->dev_list, list_node) { |
3c07cbc4 | 393 | ret = atomic_read(&genpd->sd_count) == 0 ? |
4605ab65 | 394 | __pm_genpd_save_device(pdd, genpd) : -EBUSY; |
3f241775 RW |
395 | |
396 | if (genpd_abort_poweroff(genpd)) | |
397 | goto out; | |
398 | ||
697a7f37 RW |
399 | if (ret) { |
400 | genpd_set_active(genpd); | |
401 | goto out; | |
402 | } | |
f721889f | 403 | |
c6d22b37 RW |
404 | if (genpd->status == GPD_STATE_REPEAT) { |
405 | genpd->poweroff_task = NULL; | |
406 | goto start; | |
407 | } | |
408 | } | |
17b75eca | 409 | |
3c07cbc4 | 410 | if (genpd->power_off) { |
0140d8bd RW |
411 | ktime_t time_start; |
412 | s64 elapsed_ns; | |
413 | ||
3c07cbc4 RW |
414 | if (atomic_read(&genpd->sd_count) > 0) { |
415 | ret = -EBUSY; | |
c6d22b37 RW |
416 | goto out; |
417 | } | |
17b75eca | 418 | |
0140d8bd RW |
419 | time_start = ktime_get(); |
420 | ||
3c07cbc4 | 421 | /* |
5063ce15 RW |
422 | * If sd_count > 0 at this point, one of the subdomains hasn't |
423 | * managed to call pm_genpd_poweron() for the master yet after | |
3c07cbc4 RW |
424 | * incrementing it. In that case pm_genpd_poweron() will wait |
425 | * for us to drop the lock, so we can call .power_off() and let | |
426 | * the pm_genpd_poweron() restore power for us (this shouldn't | |
427 | * happen very often). | |
428 | */ | |
d2805402 RW |
429 | ret = genpd->power_off(genpd); |
430 | if (ret == -EBUSY) { | |
431 | genpd_set_active(genpd); | |
d2805402 RW |
432 | goto out; |
433 | } | |
0140d8bd RW |
434 | |
435 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
e84b2c20 | 436 | if (elapsed_ns > genpd->power_off_latency_ns) { |
0140d8bd | 437 | genpd->power_off_latency_ns = elapsed_ns; |
e84b2c20 RW |
438 | if (genpd->name) |
439 | pr_warning("%s: Power-off latency exceeded, " | |
440 | "new value %lld ns\n", genpd->name, | |
441 | elapsed_ns); | |
442 | } | |
d2805402 | 443 | } |
f721889f | 444 | |
17b75eca | 445 | genpd->status = GPD_STATE_POWER_OFF; |
221e9b58 RW |
446 | genpd->power_off_time = ktime_get(); |
447 | ||
448 | /* Update PM QoS information for devices in the domain. */ | |
449 | list_for_each_entry_reverse(pdd, &genpd->dev_list, list_node) { | |
450 | struct gpd_timing_data *td = &to_gpd_data(pdd)->td; | |
451 | ||
452 | pm_runtime_update_max_time_suspended(pdd->dev, | |
453 | td->start_latency_ns + | |
454 | td->restore_state_latency_ns + | |
455 | genpd->power_on_latency_ns); | |
456 | } | |
f721889f | 457 | |
5063ce15 RW |
458 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
459 | genpd_sd_counter_dec(link->master); | |
460 | genpd_queue_power_off_work(link->master); | |
461 | } | |
f721889f | 462 | |
c6d22b37 RW |
463 | out: |
464 | genpd->poweroff_task = NULL; | |
465 | wake_up_all(&genpd->status_wait_queue); | |
466 | return ret; | |
f721889f RW |
467 | } |
468 | ||
469 | /** | |
470 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
471 | * @work: Work structure used for scheduling the execution of this function. | |
472 | */ | |
473 | static void genpd_power_off_work_fn(struct work_struct *work) | |
474 | { | |
475 | struct generic_pm_domain *genpd; | |
476 | ||
477 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
478 | ||
17b75eca | 479 | genpd_acquire_lock(genpd); |
f721889f | 480 | pm_genpd_poweroff(genpd); |
17b75eca | 481 | genpd_release_lock(genpd); |
f721889f RW |
482 | } |
483 | ||
484 | /** | |
485 | * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. | |
486 | * @dev: Device to suspend. | |
487 | * | |
488 | * Carry out a runtime suspend of a device under the assumption that its | |
489 | * pm_domain field points to the domain member of an object of type | |
490 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
491 | */ | |
492 | static int pm_genpd_runtime_suspend(struct device *dev) | |
493 | { | |
494 | struct generic_pm_domain *genpd; | |
b02c999a | 495 | bool (*stop_ok)(struct device *__dev); |
d5e4cbfe | 496 | int ret; |
f721889f RW |
497 | |
498 | dev_dbg(dev, "%s()\n", __func__); | |
499 | ||
5248051b RW |
500 | genpd = dev_to_genpd(dev); |
501 | if (IS_ERR(genpd)) | |
f721889f RW |
502 | return -EINVAL; |
503 | ||
0aa2a221 RW |
504 | might_sleep_if(!genpd->dev_irq_safe); |
505 | ||
1e78a0c7 RW |
506 | if (dev_gpd_data(dev)->always_on) |
507 | return -EBUSY; | |
508 | ||
b02c999a RW |
509 | stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL; |
510 | if (stop_ok && !stop_ok(dev)) | |
511 | return -EBUSY; | |
512 | ||
d5e4cbfe RW |
513 | ret = genpd_stop_dev(genpd, dev); |
514 | if (ret) | |
515 | return ret; | |
17b75eca | 516 | |
b02c999a RW |
517 | pm_runtime_update_max_time_suspended(dev, |
518 | dev_gpd_data(dev)->td.start_latency_ns); | |
519 | ||
0aa2a221 RW |
520 | /* |
521 | * If power.irq_safe is set, this routine will be run with interrupts | |
522 | * off, so it can't use mutexes. | |
523 | */ | |
524 | if (dev->power.irq_safe) | |
525 | return 0; | |
526 | ||
c6d22b37 | 527 | mutex_lock(&genpd->lock); |
f721889f RW |
528 | genpd->in_progress++; |
529 | pm_genpd_poweroff(genpd); | |
530 | genpd->in_progress--; | |
c6d22b37 | 531 | mutex_unlock(&genpd->lock); |
f721889f RW |
532 | |
533 | return 0; | |
534 | } | |
535 | ||
f721889f RW |
536 | /** |
537 | * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
538 | * @dev: Device to resume. | |
539 | * | |
540 | * Carry out a runtime resume of a device under the assumption that its | |
541 | * pm_domain field points to the domain member of an object of type | |
542 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
543 | */ | |
544 | static int pm_genpd_runtime_resume(struct device *dev) | |
545 | { | |
546 | struct generic_pm_domain *genpd; | |
c6d22b37 | 547 | DEFINE_WAIT(wait); |
f721889f RW |
548 | int ret; |
549 | ||
550 | dev_dbg(dev, "%s()\n", __func__); | |
551 | ||
5248051b RW |
552 | genpd = dev_to_genpd(dev); |
553 | if (IS_ERR(genpd)) | |
f721889f RW |
554 | return -EINVAL; |
555 | ||
0aa2a221 RW |
556 | might_sleep_if(!genpd->dev_irq_safe); |
557 | ||
558 | /* If power.irq_safe, the PM domain is never powered off. */ | |
559 | if (dev->power.irq_safe) | |
560 | goto out; | |
561 | ||
c6d22b37 | 562 | mutex_lock(&genpd->lock); |
3f241775 RW |
563 | ret = __pm_genpd_poweron(genpd); |
564 | if (ret) { | |
565 | mutex_unlock(&genpd->lock); | |
566 | return ret; | |
567 | } | |
17b75eca | 568 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 RW |
569 | genpd->resume_count++; |
570 | for (;;) { | |
571 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
572 | TASK_UNINTERRUPTIBLE); | |
573 | /* | |
574 | * If current is the powering off task, we have been called | |
575 | * reentrantly from one of the device callbacks, so we should | |
576 | * not wait. | |
577 | */ | |
578 | if (!genpd->poweroff_task || genpd->poweroff_task == current) | |
579 | break; | |
580 | mutex_unlock(&genpd->lock); | |
581 | ||
582 | schedule(); | |
583 | ||
584 | mutex_lock(&genpd->lock); | |
585 | } | |
586 | finish_wait(&genpd->status_wait_queue, &wait); | |
cd0ea672 | 587 | __pm_genpd_restore_device(dev->power.subsys_data->domain_data, genpd); |
c6d22b37 RW |
588 | genpd->resume_count--; |
589 | genpd_set_active(genpd); | |
17b75eca | 590 | wake_up_all(&genpd->status_wait_queue); |
c6d22b37 | 591 | mutex_unlock(&genpd->lock); |
17b75eca | 592 | |
0aa2a221 | 593 | out: |
d5e4cbfe | 594 | genpd_start_dev(genpd, dev); |
f721889f RW |
595 | |
596 | return 0; | |
597 | } | |
598 | ||
17f2ae7f RW |
599 | /** |
600 | * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use. | |
601 | */ | |
602 | void pm_genpd_poweroff_unused(void) | |
603 | { | |
604 | struct generic_pm_domain *genpd; | |
605 | ||
606 | mutex_lock(&gpd_list_lock); | |
607 | ||
608 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
609 | genpd_queue_power_off_work(genpd); | |
610 | ||
611 | mutex_unlock(&gpd_list_lock); | |
612 | } | |
613 | ||
f721889f RW |
614 | #else |
615 | ||
616 | static inline void genpd_power_off_work_fn(struct work_struct *work) {} | |
617 | ||
618 | #define pm_genpd_runtime_suspend NULL | |
619 | #define pm_genpd_runtime_resume NULL | |
620 | ||
621 | #endif /* CONFIG_PM_RUNTIME */ | |
622 | ||
596ba34b RW |
623 | #ifdef CONFIG_PM_SLEEP |
624 | ||
d5e4cbfe RW |
625 | static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd, |
626 | struct device *dev) | |
627 | { | |
628 | return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev); | |
629 | } | |
630 | ||
d23b9b00 RW |
631 | static int genpd_suspend_dev(struct generic_pm_domain *genpd, struct device *dev) |
632 | { | |
633 | return GENPD_DEV_CALLBACK(genpd, int, suspend, dev); | |
634 | } | |
635 | ||
636 | static int genpd_suspend_late(struct generic_pm_domain *genpd, struct device *dev) | |
637 | { | |
638 | return GENPD_DEV_CALLBACK(genpd, int, suspend_late, dev); | |
639 | } | |
640 | ||
641 | static int genpd_resume_early(struct generic_pm_domain *genpd, struct device *dev) | |
642 | { | |
643 | return GENPD_DEV_CALLBACK(genpd, int, resume_early, dev); | |
644 | } | |
645 | ||
646 | static int genpd_resume_dev(struct generic_pm_domain *genpd, struct device *dev) | |
647 | { | |
648 | return GENPD_DEV_CALLBACK(genpd, int, resume, dev); | |
649 | } | |
650 | ||
651 | static int genpd_freeze_dev(struct generic_pm_domain *genpd, struct device *dev) | |
652 | { | |
653 | return GENPD_DEV_CALLBACK(genpd, int, freeze, dev); | |
654 | } | |
655 | ||
656 | static int genpd_freeze_late(struct generic_pm_domain *genpd, struct device *dev) | |
657 | { | |
658 | return GENPD_DEV_CALLBACK(genpd, int, freeze_late, dev); | |
659 | } | |
660 | ||
661 | static int genpd_thaw_early(struct generic_pm_domain *genpd, struct device *dev) | |
662 | { | |
663 | return GENPD_DEV_CALLBACK(genpd, int, thaw_early, dev); | |
664 | } | |
665 | ||
666 | static int genpd_thaw_dev(struct generic_pm_domain *genpd, struct device *dev) | |
667 | { | |
668 | return GENPD_DEV_CALLBACK(genpd, int, thaw, dev); | |
669 | } | |
670 | ||
596ba34b | 671 | /** |
5063ce15 | 672 | * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters. |
596ba34b RW |
673 | * @genpd: PM domain to power off, if possible. |
674 | * | |
675 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 676 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b RW |
677 | * |
678 | * This function is only called in "noirq" stages of system power transitions, | |
679 | * so it need not acquire locks (all of the "noirq" callbacks are executed | |
680 | * sequentially, so it is guaranteed that it will never run twice in parallel). | |
681 | */ | |
682 | static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd) | |
683 | { | |
5063ce15 | 684 | struct gpd_link *link; |
596ba34b | 685 | |
17b75eca | 686 | if (genpd->status == GPD_STATE_POWER_OFF) |
596ba34b RW |
687 | return; |
688 | ||
c4bb3160 RW |
689 | if (genpd->suspended_count != genpd->device_count |
690 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
691 | return; |
692 | ||
693 | if (genpd->power_off) | |
694 | genpd->power_off(genpd); | |
695 | ||
17b75eca | 696 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
697 | |
698 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
699 | genpd_sd_counter_dec(link->master); | |
700 | pm_genpd_sync_poweroff(link->master); | |
596ba34b RW |
701 | } |
702 | } | |
703 | ||
4ecd6e65 RW |
704 | /** |
705 | * resume_needed - Check whether to resume a device before system suspend. | |
706 | * @dev: Device to check. | |
707 | * @genpd: PM domain the device belongs to. | |
708 | * | |
709 | * There are two cases in which a device that can wake up the system from sleep | |
710 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled | |
711 | * to wake up the system and it has to remain active for this purpose while the | |
712 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
713 | * the system from sleep states and it generally doesn't generate wakeup signals | |
714 | * by itself (those signals are generated on its behalf by other parts of the | |
715 | * system). In the latter case it may be necessary to reconfigure the device's | |
716 | * wakeup settings during system suspend, because it may have been set up to | |
717 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
718 | * Return 'true' in either of the above cases. | |
719 | */ | |
720 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) | |
721 | { | |
722 | bool active_wakeup; | |
723 | ||
724 | if (!device_can_wakeup(dev)) | |
725 | return false; | |
726 | ||
d5e4cbfe | 727 | active_wakeup = genpd_dev_active_wakeup(genpd, dev); |
4ecd6e65 RW |
728 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
729 | } | |
730 | ||
596ba34b RW |
731 | /** |
732 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
733 | * @dev: Device to start the transition of. | |
734 | * | |
735 | * Start a power transition of a device (during a system-wide power transition) | |
736 | * under the assumption that its pm_domain field points to the domain member of | |
737 | * an object of type struct generic_pm_domain representing a PM domain | |
738 | * consisting of I/O devices. | |
739 | */ | |
740 | static int pm_genpd_prepare(struct device *dev) | |
741 | { | |
742 | struct generic_pm_domain *genpd; | |
b6c10c84 | 743 | int ret; |
596ba34b RW |
744 | |
745 | dev_dbg(dev, "%s()\n", __func__); | |
746 | ||
747 | genpd = dev_to_genpd(dev); | |
748 | if (IS_ERR(genpd)) | |
749 | return -EINVAL; | |
750 | ||
17b75eca RW |
751 | /* |
752 | * If a wakeup request is pending for the device, it should be woken up | |
753 | * at this point and a system wakeup event should be reported if it's | |
754 | * set up to wake up the system from sleep states. | |
755 | */ | |
756 | pm_runtime_get_noresume(dev); | |
757 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) | |
758 | pm_wakeup_event(dev, 0); | |
759 | ||
760 | if (pm_wakeup_pending()) { | |
761 | pm_runtime_put_sync(dev); | |
762 | return -EBUSY; | |
763 | } | |
764 | ||
4ecd6e65 RW |
765 | if (resume_needed(dev, genpd)) |
766 | pm_runtime_resume(dev); | |
767 | ||
17b75eca | 768 | genpd_acquire_lock(genpd); |
596ba34b | 769 | |
65533bbf RW |
770 | if (genpd->prepared_count++ == 0) { |
771 | genpd->suspended_count = 0; | |
17b75eca | 772 | genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; |
65533bbf | 773 | } |
17b75eca RW |
774 | |
775 | genpd_release_lock(genpd); | |
596ba34b RW |
776 | |
777 | if (genpd->suspend_power_off) { | |
17b75eca | 778 | pm_runtime_put_noidle(dev); |
596ba34b RW |
779 | return 0; |
780 | } | |
781 | ||
782 | /* | |
17b75eca RW |
783 | * The PM domain must be in the GPD_STATE_ACTIVE state at this point, |
784 | * so pm_genpd_poweron() will return immediately, but if the device | |
d5e4cbfe | 785 | * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need |
17b75eca | 786 | * to make it operational. |
596ba34b | 787 | */ |
17b75eca | 788 | pm_runtime_resume(dev); |
596ba34b RW |
789 | __pm_runtime_disable(dev, false); |
790 | ||
b6c10c84 RW |
791 | ret = pm_generic_prepare(dev); |
792 | if (ret) { | |
793 | mutex_lock(&genpd->lock); | |
794 | ||
795 | if (--genpd->prepared_count == 0) | |
796 | genpd->suspend_power_off = false; | |
797 | ||
798 | mutex_unlock(&genpd->lock); | |
17b75eca | 799 | pm_runtime_enable(dev); |
b6c10c84 | 800 | } |
17b75eca RW |
801 | |
802 | pm_runtime_put_sync(dev); | |
b6c10c84 | 803 | return ret; |
596ba34b RW |
804 | } |
805 | ||
806 | /** | |
807 | * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. | |
808 | * @dev: Device to suspend. | |
809 | * | |
810 | * Suspend a device under the assumption that its pm_domain field points to the | |
811 | * domain member of an object of type struct generic_pm_domain representing | |
812 | * a PM domain consisting of I/O devices. | |
813 | */ | |
814 | static int pm_genpd_suspend(struct device *dev) | |
815 | { | |
816 | struct generic_pm_domain *genpd; | |
817 | ||
818 | dev_dbg(dev, "%s()\n", __func__); | |
819 | ||
820 | genpd = dev_to_genpd(dev); | |
821 | if (IS_ERR(genpd)) | |
822 | return -EINVAL; | |
823 | ||
d23b9b00 | 824 | return genpd->suspend_power_off ? 0 : genpd_suspend_dev(genpd, dev); |
596ba34b RW |
825 | } |
826 | ||
827 | /** | |
0496c8ae | 828 | * pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain. |
596ba34b RW |
829 | * @dev: Device to suspend. |
830 | * | |
831 | * Carry out a late suspend of a device under the assumption that its | |
832 | * pm_domain field points to the domain member of an object of type | |
833 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
834 | */ | |
0496c8ae | 835 | static int pm_genpd_suspend_late(struct device *dev) |
596ba34b RW |
836 | { |
837 | struct generic_pm_domain *genpd; | |
596ba34b RW |
838 | |
839 | dev_dbg(dev, "%s()\n", __func__); | |
840 | ||
841 | genpd = dev_to_genpd(dev); | |
842 | if (IS_ERR(genpd)) | |
843 | return -EINVAL; | |
844 | ||
0496c8ae RW |
845 | return genpd->suspend_power_off ? 0 : genpd_suspend_late(genpd, dev); |
846 | } | |
596ba34b | 847 | |
0496c8ae RW |
848 | /** |
849 | * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. | |
850 | * @dev: Device to suspend. | |
851 | * | |
852 | * Stop the device and remove power from the domain if all devices in it have | |
853 | * been stopped. | |
854 | */ | |
855 | static int pm_genpd_suspend_noirq(struct device *dev) | |
856 | { | |
857 | struct generic_pm_domain *genpd; | |
858 | ||
859 | dev_dbg(dev, "%s()\n", __func__); | |
860 | ||
861 | genpd = dev_to_genpd(dev); | |
862 | if (IS_ERR(genpd)) | |
863 | return -EINVAL; | |
596ba34b | 864 | |
1e78a0c7 | 865 | if (genpd->suspend_power_off || dev_gpd_data(dev)->always_on |
0496c8ae | 866 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
d4f2d87a RW |
867 | return 0; |
868 | ||
d5e4cbfe | 869 | genpd_stop_dev(genpd, dev); |
596ba34b RW |
870 | |
871 | /* | |
872 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
873 | * guaranteed that this function will never run twice in parallel for | |
874 | * the same PM domain, so it is not necessary to use locking here. | |
875 | */ | |
876 | genpd->suspended_count++; | |
877 | pm_genpd_sync_poweroff(genpd); | |
878 | ||
879 | return 0; | |
880 | } | |
881 | ||
882 | /** | |
0496c8ae | 883 | * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
884 | * @dev: Device to resume. |
885 | * | |
0496c8ae | 886 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b RW |
887 | */ |
888 | static int pm_genpd_resume_noirq(struct device *dev) | |
889 | { | |
890 | struct generic_pm_domain *genpd; | |
891 | ||
892 | dev_dbg(dev, "%s()\n", __func__); | |
893 | ||
894 | genpd = dev_to_genpd(dev); | |
895 | if (IS_ERR(genpd)) | |
896 | return -EINVAL; | |
897 | ||
1e78a0c7 | 898 | if (genpd->suspend_power_off || dev_gpd_data(dev)->always_on |
cc85b207 | 899 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
596ba34b RW |
900 | return 0; |
901 | ||
902 | /* | |
903 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
904 | * guaranteed that this function will never run twice in parallel for | |
905 | * the same PM domain, so it is not necessary to use locking here. | |
906 | */ | |
907 | pm_genpd_poweron(genpd); | |
908 | genpd->suspended_count--; | |
596ba34b | 909 | |
0496c8ae | 910 | return genpd_start_dev(genpd, dev); |
596ba34b RW |
911 | } |
912 | ||
913 | /** | |
0496c8ae RW |
914 | * pm_genpd_resume_early - Early resume of a device in an I/O PM domain. |
915 | * @dev: Device to resume. | |
916 | * | |
917 | * Carry out an early resume of a device under the assumption that its | |
918 | * pm_domain field points to the domain member of an object of type | |
919 | * struct generic_pm_domain representing a power domain consisting of I/O | |
920 | * devices. | |
921 | */ | |
922 | static int pm_genpd_resume_early(struct device *dev) | |
923 | { | |
924 | struct generic_pm_domain *genpd; | |
925 | ||
926 | dev_dbg(dev, "%s()\n", __func__); | |
927 | ||
928 | genpd = dev_to_genpd(dev); | |
929 | if (IS_ERR(genpd)) | |
930 | return -EINVAL; | |
931 | ||
932 | return genpd->suspend_power_off ? 0 : genpd_resume_early(genpd, dev); | |
933 | } | |
934 | ||
935 | /** | |
936 | * pm_genpd_resume - Resume of device in an I/O PM domain. | |
596ba34b RW |
937 | * @dev: Device to resume. |
938 | * | |
939 | * Resume a device under the assumption that its pm_domain field points to the | |
940 | * domain member of an object of type struct generic_pm_domain representing | |
941 | * a power domain consisting of I/O devices. | |
942 | */ | |
943 | static int pm_genpd_resume(struct device *dev) | |
944 | { | |
945 | struct generic_pm_domain *genpd; | |
946 | ||
947 | dev_dbg(dev, "%s()\n", __func__); | |
948 | ||
949 | genpd = dev_to_genpd(dev); | |
950 | if (IS_ERR(genpd)) | |
951 | return -EINVAL; | |
952 | ||
d23b9b00 | 953 | return genpd->suspend_power_off ? 0 : genpd_resume_dev(genpd, dev); |
596ba34b RW |
954 | } |
955 | ||
956 | /** | |
0496c8ae | 957 | * pm_genpd_freeze - Freezing a device in an I/O PM domain. |
596ba34b RW |
958 | * @dev: Device to freeze. |
959 | * | |
960 | * Freeze a device under the assumption that its pm_domain field points to the | |
961 | * domain member of an object of type struct generic_pm_domain representing | |
962 | * a power domain consisting of I/O devices. | |
963 | */ | |
964 | static int pm_genpd_freeze(struct device *dev) | |
965 | { | |
966 | struct generic_pm_domain *genpd; | |
967 | ||
968 | dev_dbg(dev, "%s()\n", __func__); | |
969 | ||
970 | genpd = dev_to_genpd(dev); | |
971 | if (IS_ERR(genpd)) | |
972 | return -EINVAL; | |
973 | ||
d23b9b00 | 974 | return genpd->suspend_power_off ? 0 : genpd_freeze_dev(genpd, dev); |
596ba34b RW |
975 | } |
976 | ||
977 | /** | |
0496c8ae RW |
978 | * pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain. |
979 | * @dev: Device to freeze. | |
980 | * | |
981 | * Carry out a late freeze of a device under the assumption that its | |
982 | * pm_domain field points to the domain member of an object of type | |
983 | * struct generic_pm_domain representing a power domain consisting of I/O | |
984 | * devices. | |
985 | */ | |
986 | static int pm_genpd_freeze_late(struct device *dev) | |
987 | { | |
988 | struct generic_pm_domain *genpd; | |
989 | ||
990 | dev_dbg(dev, "%s()\n", __func__); | |
991 | ||
992 | genpd = dev_to_genpd(dev); | |
993 | if (IS_ERR(genpd)) | |
994 | return -EINVAL; | |
995 | ||
996 | return genpd->suspend_power_off ? 0 : genpd_freeze_late(genpd, dev); | |
997 | } | |
998 | ||
999 | /** | |
1000 | * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. | |
596ba34b RW |
1001 | * @dev: Device to freeze. |
1002 | * | |
1003 | * Carry out a late freeze of a device under the assumption that its | |
1004 | * pm_domain field points to the domain member of an object of type | |
1005 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1006 | * devices. | |
1007 | */ | |
1008 | static int pm_genpd_freeze_noirq(struct device *dev) | |
1009 | { | |
1010 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1011 | |
1012 | dev_dbg(dev, "%s()\n", __func__); | |
1013 | ||
1014 | genpd = dev_to_genpd(dev); | |
1015 | if (IS_ERR(genpd)) | |
1016 | return -EINVAL; | |
1017 | ||
1e78a0c7 RW |
1018 | return genpd->suspend_power_off || dev_gpd_data(dev)->always_on ? |
1019 | 0 : genpd_stop_dev(genpd, dev); | |
0496c8ae | 1020 | } |
596ba34b | 1021 | |
0496c8ae RW |
1022 | /** |
1023 | * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain. | |
1024 | * @dev: Device to thaw. | |
1025 | * | |
1026 | * Start the device, unless power has been removed from the domain already | |
1027 | * before the system transition. | |
1028 | */ | |
1029 | static int pm_genpd_thaw_noirq(struct device *dev) | |
1030 | { | |
1031 | struct generic_pm_domain *genpd; | |
596ba34b | 1032 | |
0496c8ae | 1033 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 1034 | |
0496c8ae RW |
1035 | genpd = dev_to_genpd(dev); |
1036 | if (IS_ERR(genpd)) | |
1037 | return -EINVAL; | |
1038 | ||
1e78a0c7 RW |
1039 | return genpd->suspend_power_off || dev_gpd_data(dev)->always_on ? |
1040 | 0 : genpd_start_dev(genpd, dev); | |
596ba34b RW |
1041 | } |
1042 | ||
1043 | /** | |
0496c8ae | 1044 | * pm_genpd_thaw_early - Early thaw of device in an I/O PM domain. |
596ba34b RW |
1045 | * @dev: Device to thaw. |
1046 | * | |
1047 | * Carry out an early thaw of a device under the assumption that its | |
1048 | * pm_domain field points to the domain member of an object of type | |
1049 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1050 | * devices. | |
1051 | */ | |
0496c8ae | 1052 | static int pm_genpd_thaw_early(struct device *dev) |
596ba34b RW |
1053 | { |
1054 | struct generic_pm_domain *genpd; | |
1055 | ||
1056 | dev_dbg(dev, "%s()\n", __func__); | |
1057 | ||
1058 | genpd = dev_to_genpd(dev); | |
1059 | if (IS_ERR(genpd)) | |
1060 | return -EINVAL; | |
1061 | ||
0496c8ae | 1062 | return genpd->suspend_power_off ? 0 : genpd_thaw_early(genpd, dev); |
596ba34b RW |
1063 | } |
1064 | ||
1065 | /** | |
1066 | * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. | |
1067 | * @dev: Device to thaw. | |
1068 | * | |
1069 | * Thaw a device under the assumption that its pm_domain field points to the | |
1070 | * domain member of an object of type struct generic_pm_domain representing | |
1071 | * a power domain consisting of I/O devices. | |
1072 | */ | |
1073 | static int pm_genpd_thaw(struct device *dev) | |
1074 | { | |
1075 | struct generic_pm_domain *genpd; | |
1076 | ||
1077 | dev_dbg(dev, "%s()\n", __func__); | |
1078 | ||
1079 | genpd = dev_to_genpd(dev); | |
1080 | if (IS_ERR(genpd)) | |
1081 | return -EINVAL; | |
1082 | ||
d23b9b00 | 1083 | return genpd->suspend_power_off ? 0 : genpd_thaw_dev(genpd, dev); |
596ba34b RW |
1084 | } |
1085 | ||
1086 | /** | |
0496c8ae | 1087 | * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1088 | * @dev: Device to resume. |
1089 | * | |
0496c8ae RW |
1090 | * Make sure the domain will be in the same power state as before the |
1091 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b RW |
1092 | */ |
1093 | static int pm_genpd_restore_noirq(struct device *dev) | |
1094 | { | |
1095 | struct generic_pm_domain *genpd; | |
1096 | ||
1097 | dev_dbg(dev, "%s()\n", __func__); | |
1098 | ||
1099 | genpd = dev_to_genpd(dev); | |
1100 | if (IS_ERR(genpd)) | |
1101 | return -EINVAL; | |
1102 | ||
1103 | /* | |
1104 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1105 | * guaranteed that this function will never run twice in parallel for | |
1106 | * the same PM domain, so it is not necessary to use locking here. | |
65533bbf RW |
1107 | * |
1108 | * At this point suspended_count == 0 means we are being run for the | |
1109 | * first time for the given domain in the present cycle. | |
596ba34b | 1110 | */ |
65533bbf | 1111 | if (genpd->suspended_count++ == 0) { |
596ba34b | 1112 | /* |
65533bbf RW |
1113 | * The boot kernel might put the domain into arbitrary state, |
1114 | * so make it appear as powered off to pm_genpd_poweron(), so | |
1115 | * that it tries to power it on in case it was really off. | |
596ba34b | 1116 | */ |
65533bbf RW |
1117 | genpd->status = GPD_STATE_POWER_OFF; |
1118 | if (genpd->suspend_power_off) { | |
1119 | /* | |
1120 | * If the domain was off before the hibernation, make | |
1121 | * sure it will be off going forward. | |
1122 | */ | |
1123 | if (genpd->power_off) | |
1124 | genpd->power_off(genpd); | |
1125 | ||
1126 | return 0; | |
1127 | } | |
596ba34b RW |
1128 | } |
1129 | ||
18dd2ece RW |
1130 | if (genpd->suspend_power_off) |
1131 | return 0; | |
1132 | ||
596ba34b | 1133 | pm_genpd_poweron(genpd); |
596ba34b | 1134 | |
1e78a0c7 | 1135 | return dev_gpd_data(dev)->always_on ? 0 : genpd_start_dev(genpd, dev); |
596ba34b RW |
1136 | } |
1137 | ||
1138 | /** | |
1139 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
1140 | * @dev: Device to complete the transition of. | |
1141 | * | |
1142 | * Complete a power transition of a device (during a system-wide power | |
1143 | * transition) under the assumption that its pm_domain field points to the | |
1144 | * domain member of an object of type struct generic_pm_domain representing | |
1145 | * a power domain consisting of I/O devices. | |
1146 | */ | |
1147 | static void pm_genpd_complete(struct device *dev) | |
1148 | { | |
1149 | struct generic_pm_domain *genpd; | |
1150 | bool run_complete; | |
1151 | ||
1152 | dev_dbg(dev, "%s()\n", __func__); | |
1153 | ||
1154 | genpd = dev_to_genpd(dev); | |
1155 | if (IS_ERR(genpd)) | |
1156 | return; | |
1157 | ||
1158 | mutex_lock(&genpd->lock); | |
1159 | ||
1160 | run_complete = !genpd->suspend_power_off; | |
1161 | if (--genpd->prepared_count == 0) | |
1162 | genpd->suspend_power_off = false; | |
1163 | ||
1164 | mutex_unlock(&genpd->lock); | |
1165 | ||
1166 | if (run_complete) { | |
1167 | pm_generic_complete(dev); | |
6f00ff78 | 1168 | pm_runtime_set_active(dev); |
596ba34b | 1169 | pm_runtime_enable(dev); |
6f00ff78 | 1170 | pm_runtime_idle(dev); |
596ba34b RW |
1171 | } |
1172 | } | |
1173 | ||
1174 | #else | |
1175 | ||
1176 | #define pm_genpd_prepare NULL | |
1177 | #define pm_genpd_suspend NULL | |
0496c8ae | 1178 | #define pm_genpd_suspend_late NULL |
596ba34b | 1179 | #define pm_genpd_suspend_noirq NULL |
0496c8ae | 1180 | #define pm_genpd_resume_early NULL |
596ba34b RW |
1181 | #define pm_genpd_resume_noirq NULL |
1182 | #define pm_genpd_resume NULL | |
1183 | #define pm_genpd_freeze NULL | |
0496c8ae | 1184 | #define pm_genpd_freeze_late NULL |
596ba34b | 1185 | #define pm_genpd_freeze_noirq NULL |
0496c8ae | 1186 | #define pm_genpd_thaw_early NULL |
596ba34b RW |
1187 | #define pm_genpd_thaw_noirq NULL |
1188 | #define pm_genpd_thaw NULL | |
596ba34b | 1189 | #define pm_genpd_restore_noirq NULL |
596ba34b RW |
1190 | #define pm_genpd_complete NULL |
1191 | ||
1192 | #endif /* CONFIG_PM_SLEEP */ | |
1193 | ||
f721889f | 1194 | /** |
b02c999a | 1195 | * __pm_genpd_add_device - Add a device to an I/O PM domain. |
f721889f RW |
1196 | * @genpd: PM domain to add the device to. |
1197 | * @dev: Device to be added. | |
b02c999a | 1198 | * @td: Set of PM QoS timing parameters to attach to the device. |
f721889f | 1199 | */ |
b02c999a RW |
1200 | int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1201 | struct gpd_timing_data *td) | |
f721889f | 1202 | { |
cd0ea672 | 1203 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1204 | struct pm_domain_data *pdd; |
f721889f RW |
1205 | int ret = 0; |
1206 | ||
1207 | dev_dbg(dev, "%s()\n", __func__); | |
1208 | ||
1209 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1210 | return -EINVAL; | |
1211 | ||
17b75eca | 1212 | genpd_acquire_lock(genpd); |
f721889f | 1213 | |
17b75eca | 1214 | if (genpd->status == GPD_STATE_POWER_OFF) { |
f721889f RW |
1215 | ret = -EINVAL; |
1216 | goto out; | |
1217 | } | |
1218 | ||
596ba34b RW |
1219 | if (genpd->prepared_count > 0) { |
1220 | ret = -EAGAIN; | |
1221 | goto out; | |
1222 | } | |
1223 | ||
4605ab65 RW |
1224 | list_for_each_entry(pdd, &genpd->dev_list, list_node) |
1225 | if (pdd->dev == dev) { | |
f721889f RW |
1226 | ret = -EINVAL; |
1227 | goto out; | |
1228 | } | |
1229 | ||
cd0ea672 RW |
1230 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); |
1231 | if (!gpd_data) { | |
1232 | ret = -ENOMEM; | |
1233 | goto out; | |
1234 | } | |
1235 | ||
596ba34b | 1236 | genpd->device_count++; |
f721889f | 1237 | |
f721889f | 1238 | dev->pm_domain = &genpd->domain; |
4605ab65 | 1239 | dev_pm_get_subsys_data(dev); |
cd0ea672 RW |
1240 | dev->power.subsys_data->domain_data = &gpd_data->base; |
1241 | gpd_data->base.dev = dev; | |
1242 | gpd_data->need_restore = false; | |
1243 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); | |
b02c999a RW |
1244 | if (td) |
1245 | gpd_data->td = *td; | |
f721889f RW |
1246 | |
1247 | out: | |
17b75eca | 1248 | genpd_release_lock(genpd); |
f721889f RW |
1249 | |
1250 | return ret; | |
1251 | } | |
1252 | ||
c8aa130b TA |
1253 | /** |
1254 | * __pm_genpd_of_add_device - Add a device to an I/O PM domain. | |
1255 | * @genpd_node: Device tree node pointer representing a PM domain to which the | |
1256 | * the device is added to. | |
1257 | * @dev: Device to be added. | |
1258 | * @td: Set of PM QoS timing parameters to attach to the device. | |
1259 | */ | |
1260 | int __pm_genpd_of_add_device(struct device_node *genpd_node, struct device *dev, | |
1261 | struct gpd_timing_data *td) | |
1262 | { | |
1263 | struct generic_pm_domain *genpd = NULL, *gpd; | |
1264 | ||
1265 | dev_dbg(dev, "%s()\n", __func__); | |
1266 | ||
1267 | if (IS_ERR_OR_NULL(genpd_node) || IS_ERR_OR_NULL(dev)) | |
1268 | return -EINVAL; | |
1269 | ||
1270 | mutex_lock(&gpd_list_lock); | |
1271 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
1272 | if (gpd->of_node == genpd_node) { | |
1273 | genpd = gpd; | |
1274 | break; | |
1275 | } | |
1276 | } | |
1277 | mutex_unlock(&gpd_list_lock); | |
1278 | ||
1279 | if (!genpd) | |
1280 | return -EINVAL; | |
1281 | ||
1282 | return __pm_genpd_add_device(genpd, dev, td); | |
1283 | } | |
1284 | ||
f721889f RW |
1285 | /** |
1286 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1287 | * @genpd: PM domain to remove the device from. | |
1288 | * @dev: Device to be removed. | |
1289 | */ | |
1290 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1291 | struct device *dev) | |
1292 | { | |
4605ab65 | 1293 | struct pm_domain_data *pdd; |
f721889f RW |
1294 | int ret = -EINVAL; |
1295 | ||
1296 | dev_dbg(dev, "%s()\n", __func__); | |
1297 | ||
1298 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1299 | return -EINVAL; | |
1300 | ||
17b75eca | 1301 | genpd_acquire_lock(genpd); |
f721889f | 1302 | |
596ba34b RW |
1303 | if (genpd->prepared_count > 0) { |
1304 | ret = -EAGAIN; | |
1305 | goto out; | |
1306 | } | |
1307 | ||
4605ab65 RW |
1308 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { |
1309 | if (pdd->dev != dev) | |
f721889f RW |
1310 | continue; |
1311 | ||
4605ab65 RW |
1312 | list_del_init(&pdd->list_node); |
1313 | pdd->dev = NULL; | |
1314 | dev_pm_put_subsys_data(dev); | |
f721889f | 1315 | dev->pm_domain = NULL; |
cd0ea672 | 1316 | kfree(to_gpd_data(pdd)); |
f721889f | 1317 | |
596ba34b | 1318 | genpd->device_count--; |
f721889f RW |
1319 | |
1320 | ret = 0; | |
1321 | break; | |
1322 | } | |
1323 | ||
596ba34b | 1324 | out: |
17b75eca | 1325 | genpd_release_lock(genpd); |
f721889f RW |
1326 | |
1327 | return ret; | |
1328 | } | |
1329 | ||
1e78a0c7 RW |
1330 | /** |
1331 | * pm_genpd_dev_always_on - Set/unset the "always on" flag for a given device. | |
1332 | * @dev: Device to set/unset the flag for. | |
1333 | * @val: The new value of the device's "always on" flag. | |
1334 | */ | |
1335 | void pm_genpd_dev_always_on(struct device *dev, bool val) | |
1336 | { | |
1337 | struct pm_subsys_data *psd; | |
1338 | unsigned long flags; | |
1339 | ||
1340 | spin_lock_irqsave(&dev->power.lock, flags); | |
1341 | ||
1342 | psd = dev_to_psd(dev); | |
1343 | if (psd && psd->domain_data) | |
1344 | to_gpd_data(psd->domain_data)->always_on = val; | |
1345 | ||
1346 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
1347 | } | |
1348 | EXPORT_SYMBOL_GPL(pm_genpd_dev_always_on); | |
1349 | ||
f721889f RW |
1350 | /** |
1351 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1352 | * @genpd: Master PM domain to add the subdomain to. | |
bc0403ff | 1353 | * @subdomain: Subdomain to be added. |
f721889f RW |
1354 | */ |
1355 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
bc0403ff | 1356 | struct generic_pm_domain *subdomain) |
f721889f | 1357 | { |
5063ce15 | 1358 | struct gpd_link *link; |
f721889f RW |
1359 | int ret = 0; |
1360 | ||
bc0403ff | 1361 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1362 | return -EINVAL; |
1363 | ||
17b75eca RW |
1364 | start: |
1365 | genpd_acquire_lock(genpd); | |
bc0403ff | 1366 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); |
f721889f | 1367 | |
bc0403ff RW |
1368 | if (subdomain->status != GPD_STATE_POWER_OFF |
1369 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1370 | mutex_unlock(&subdomain->lock); | |
17b75eca RW |
1371 | genpd_release_lock(genpd); |
1372 | goto start; | |
1373 | } | |
1374 | ||
1375 | if (genpd->status == GPD_STATE_POWER_OFF | |
bc0403ff | 1376 | && subdomain->status != GPD_STATE_POWER_OFF) { |
f721889f RW |
1377 | ret = -EINVAL; |
1378 | goto out; | |
1379 | } | |
1380 | ||
5063ce15 | 1381 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
bc0403ff | 1382 | if (link->slave == subdomain && link->master == genpd) { |
f721889f RW |
1383 | ret = -EINVAL; |
1384 | goto out; | |
1385 | } | |
1386 | } | |
1387 | ||
5063ce15 RW |
1388 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1389 | if (!link) { | |
1390 | ret = -ENOMEM; | |
1391 | goto out; | |
1392 | } | |
1393 | link->master = genpd; | |
1394 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1395 | link->slave = subdomain; |
1396 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
1397 | if (subdomain->status != GPD_STATE_POWER_OFF) | |
c4bb3160 | 1398 | genpd_sd_counter_inc(genpd); |
f721889f | 1399 | |
f721889f | 1400 | out: |
bc0403ff | 1401 | mutex_unlock(&subdomain->lock); |
17b75eca | 1402 | genpd_release_lock(genpd); |
f721889f RW |
1403 | |
1404 | return ret; | |
1405 | } | |
1406 | ||
1407 | /** | |
1408 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1409 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1410 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1411 | */ |
1412 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1413 | struct generic_pm_domain *subdomain) |
f721889f | 1414 | { |
5063ce15 | 1415 | struct gpd_link *link; |
f721889f RW |
1416 | int ret = -EINVAL; |
1417 | ||
5063ce15 | 1418 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1419 | return -EINVAL; |
1420 | ||
17b75eca RW |
1421 | start: |
1422 | genpd_acquire_lock(genpd); | |
f721889f | 1423 | |
5063ce15 RW |
1424 | list_for_each_entry(link, &genpd->master_links, master_node) { |
1425 | if (link->slave != subdomain) | |
f721889f RW |
1426 | continue; |
1427 | ||
1428 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); | |
1429 | ||
17b75eca RW |
1430 | if (subdomain->status != GPD_STATE_POWER_OFF |
1431 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1432 | mutex_unlock(&subdomain->lock); | |
1433 | genpd_release_lock(genpd); | |
1434 | goto start; | |
1435 | } | |
1436 | ||
5063ce15 RW |
1437 | list_del(&link->master_node); |
1438 | list_del(&link->slave_node); | |
1439 | kfree(link); | |
17b75eca | 1440 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1441 | genpd_sd_counter_dec(genpd); |
1442 | ||
1443 | mutex_unlock(&subdomain->lock); | |
1444 | ||
1445 | ret = 0; | |
1446 | break; | |
1447 | } | |
1448 | ||
17b75eca | 1449 | genpd_release_lock(genpd); |
f721889f RW |
1450 | |
1451 | return ret; | |
1452 | } | |
1453 | ||
d5e4cbfe RW |
1454 | /** |
1455 | * pm_genpd_add_callbacks - Add PM domain callbacks to a given device. | |
1456 | * @dev: Device to add the callbacks to. | |
1457 | * @ops: Set of callbacks to add. | |
b02c999a | 1458 | * @td: Timing data to add to the device along with the callbacks (optional). |
d5e4cbfe | 1459 | */ |
b02c999a RW |
1460 | int pm_genpd_add_callbacks(struct device *dev, struct gpd_dev_ops *ops, |
1461 | struct gpd_timing_data *td) | |
d5e4cbfe RW |
1462 | { |
1463 | struct pm_domain_data *pdd; | |
1464 | int ret = 0; | |
1465 | ||
1466 | if (!(dev && dev->power.subsys_data && ops)) | |
1467 | return -EINVAL; | |
1468 | ||
1469 | pm_runtime_disable(dev); | |
1470 | device_pm_lock(); | |
1471 | ||
1472 | pdd = dev->power.subsys_data->domain_data; | |
1473 | if (pdd) { | |
1474 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); | |
1475 | ||
1476 | gpd_data->ops = *ops; | |
b02c999a RW |
1477 | if (td) |
1478 | gpd_data->td = *td; | |
d5e4cbfe RW |
1479 | } else { |
1480 | ret = -EINVAL; | |
1481 | } | |
1482 | ||
1483 | device_pm_unlock(); | |
1484 | pm_runtime_enable(dev); | |
1485 | ||
1486 | return ret; | |
1487 | } | |
1488 | EXPORT_SYMBOL_GPL(pm_genpd_add_callbacks); | |
1489 | ||
1490 | /** | |
b02c999a | 1491 | * __pm_genpd_remove_callbacks - Remove PM domain callbacks from a given device. |
d5e4cbfe | 1492 | * @dev: Device to remove the callbacks from. |
b02c999a | 1493 | * @clear_td: If set, clear the device's timing data too. |
d5e4cbfe | 1494 | */ |
b02c999a | 1495 | int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td) |
d5e4cbfe RW |
1496 | { |
1497 | struct pm_domain_data *pdd; | |
1498 | int ret = 0; | |
1499 | ||
1500 | if (!(dev && dev->power.subsys_data)) | |
1501 | return -EINVAL; | |
1502 | ||
1503 | pm_runtime_disable(dev); | |
1504 | device_pm_lock(); | |
1505 | ||
1506 | pdd = dev->power.subsys_data->domain_data; | |
1507 | if (pdd) { | |
1508 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); | |
1509 | ||
1510 | gpd_data->ops = (struct gpd_dev_ops){ 0 }; | |
b02c999a RW |
1511 | if (clear_td) |
1512 | gpd_data->td = (struct gpd_timing_data){ 0 }; | |
d5e4cbfe RW |
1513 | } else { |
1514 | ret = -EINVAL; | |
1515 | } | |
1516 | ||
1517 | device_pm_unlock(); | |
1518 | pm_runtime_enable(dev); | |
1519 | ||
1520 | return ret; | |
1521 | } | |
b02c999a | 1522 | EXPORT_SYMBOL_GPL(__pm_genpd_remove_callbacks); |
d5e4cbfe | 1523 | |
d23b9b00 RW |
1524 | /* Default device callbacks for generic PM domains. */ |
1525 | ||
ecf00475 RW |
1526 | /** |
1527 | * pm_genpd_default_save_state - Default "save device state" for PM domians. | |
1528 | * @dev: Device to handle. | |
1529 | */ | |
1530 | static int pm_genpd_default_save_state(struct device *dev) | |
1531 | { | |
1532 | int (*cb)(struct device *__dev); | |
1533 | struct device_driver *drv = dev->driver; | |
1534 | ||
1535 | cb = dev_gpd_data(dev)->ops.save_state; | |
1536 | if (cb) | |
1537 | return cb(dev); | |
1538 | ||
1539 | if (drv && drv->pm && drv->pm->runtime_suspend) | |
1540 | return drv->pm->runtime_suspend(dev); | |
1541 | ||
1542 | return 0; | |
1543 | } | |
1544 | ||
1545 | /** | |
1546 | * pm_genpd_default_restore_state - Default PM domians "restore device state". | |
1547 | * @dev: Device to handle. | |
1548 | */ | |
1549 | static int pm_genpd_default_restore_state(struct device *dev) | |
1550 | { | |
1551 | int (*cb)(struct device *__dev); | |
1552 | struct device_driver *drv = dev->driver; | |
1553 | ||
1554 | cb = dev_gpd_data(dev)->ops.restore_state; | |
1555 | if (cb) | |
1556 | return cb(dev); | |
1557 | ||
1558 | if (drv && drv->pm && drv->pm->runtime_resume) | |
1559 | return drv->pm->runtime_resume(dev); | |
1560 | ||
1561 | return 0; | |
1562 | } | |
1563 | ||
0f1d6986 RW |
1564 | #ifdef CONFIG_PM_SLEEP |
1565 | ||
d23b9b00 RW |
1566 | /** |
1567 | * pm_genpd_default_suspend - Default "device suspend" for PM domians. | |
1568 | * @dev: Device to handle. | |
1569 | */ | |
1570 | static int pm_genpd_default_suspend(struct device *dev) | |
1571 | { | |
c9914854 | 1572 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.suspend; |
d23b9b00 RW |
1573 | |
1574 | return cb ? cb(dev) : pm_generic_suspend(dev); | |
1575 | } | |
1576 | ||
1577 | /** | |
1578 | * pm_genpd_default_suspend_late - Default "late device suspend" for PM domians. | |
1579 | * @dev: Device to handle. | |
1580 | */ | |
1581 | static int pm_genpd_default_suspend_late(struct device *dev) | |
1582 | { | |
c9914854 | 1583 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.suspend_late; |
d23b9b00 | 1584 | |
0496c8ae | 1585 | return cb ? cb(dev) : pm_generic_suspend_late(dev); |
d23b9b00 RW |
1586 | } |
1587 | ||
1588 | /** | |
1589 | * pm_genpd_default_resume_early - Default "early device resume" for PM domians. | |
1590 | * @dev: Device to handle. | |
1591 | */ | |
1592 | static int pm_genpd_default_resume_early(struct device *dev) | |
1593 | { | |
c9914854 | 1594 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.resume_early; |
d23b9b00 | 1595 | |
0496c8ae | 1596 | return cb ? cb(dev) : pm_generic_resume_early(dev); |
d23b9b00 RW |
1597 | } |
1598 | ||
1599 | /** | |
1600 | * pm_genpd_default_resume - Default "device resume" for PM domians. | |
1601 | * @dev: Device to handle. | |
1602 | */ | |
1603 | static int pm_genpd_default_resume(struct device *dev) | |
1604 | { | |
c9914854 | 1605 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.resume; |
d23b9b00 RW |
1606 | |
1607 | return cb ? cb(dev) : pm_generic_resume(dev); | |
1608 | } | |
1609 | ||
1610 | /** | |
1611 | * pm_genpd_default_freeze - Default "device freeze" for PM domians. | |
1612 | * @dev: Device to handle. | |
1613 | */ | |
1614 | static int pm_genpd_default_freeze(struct device *dev) | |
1615 | { | |
1616 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze; | |
1617 | ||
1618 | return cb ? cb(dev) : pm_generic_freeze(dev); | |
1619 | } | |
1620 | ||
1621 | /** | |
1622 | * pm_genpd_default_freeze_late - Default "late device freeze" for PM domians. | |
1623 | * @dev: Device to handle. | |
1624 | */ | |
1625 | static int pm_genpd_default_freeze_late(struct device *dev) | |
1626 | { | |
1627 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze_late; | |
1628 | ||
0496c8ae | 1629 | return cb ? cb(dev) : pm_generic_freeze_late(dev); |
d23b9b00 RW |
1630 | } |
1631 | ||
1632 | /** | |
1633 | * pm_genpd_default_thaw_early - Default "early device thaw" for PM domians. | |
1634 | * @dev: Device to handle. | |
1635 | */ | |
1636 | static int pm_genpd_default_thaw_early(struct device *dev) | |
1637 | { | |
1638 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw_early; | |
1639 | ||
0496c8ae | 1640 | return cb ? cb(dev) : pm_generic_thaw_early(dev); |
d23b9b00 RW |
1641 | } |
1642 | ||
1643 | /** | |
1644 | * pm_genpd_default_thaw - Default "device thaw" for PM domians. | |
1645 | * @dev: Device to handle. | |
1646 | */ | |
1647 | static int pm_genpd_default_thaw(struct device *dev) | |
1648 | { | |
1649 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw; | |
1650 | ||
1651 | return cb ? cb(dev) : pm_generic_thaw(dev); | |
1652 | } | |
1653 | ||
0f1d6986 RW |
1654 | #else /* !CONFIG_PM_SLEEP */ |
1655 | ||
1656 | #define pm_genpd_default_suspend NULL | |
1657 | #define pm_genpd_default_suspend_late NULL | |
1658 | #define pm_genpd_default_resume_early NULL | |
1659 | #define pm_genpd_default_resume NULL | |
1660 | #define pm_genpd_default_freeze NULL | |
1661 | #define pm_genpd_default_freeze_late NULL | |
1662 | #define pm_genpd_default_thaw_early NULL | |
1663 | #define pm_genpd_default_thaw NULL | |
1664 | ||
1665 | #endif /* !CONFIG_PM_SLEEP */ | |
1666 | ||
f721889f RW |
1667 | /** |
1668 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1669 | * @genpd: PM domain object to initialize. | |
1670 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1671 | * @is_off: Initial value of the domain's power_is_off field. | |
1672 | */ | |
1673 | void pm_genpd_init(struct generic_pm_domain *genpd, | |
1674 | struct dev_power_governor *gov, bool is_off) | |
1675 | { | |
1676 | if (IS_ERR_OR_NULL(genpd)) | |
1677 | return; | |
1678 | ||
5063ce15 RW |
1679 | INIT_LIST_HEAD(&genpd->master_links); |
1680 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1681 | INIT_LIST_HEAD(&genpd->dev_list); |
f721889f RW |
1682 | mutex_init(&genpd->lock); |
1683 | genpd->gov = gov; | |
1684 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
1685 | genpd->in_progress = 0; | |
c4bb3160 | 1686 | atomic_set(&genpd->sd_count, 0); |
17b75eca RW |
1687 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
1688 | init_waitqueue_head(&genpd->status_wait_queue); | |
c6d22b37 RW |
1689 | genpd->poweroff_task = NULL; |
1690 | genpd->resume_count = 0; | |
596ba34b | 1691 | genpd->device_count = 0; |
221e9b58 | 1692 | genpd->max_off_time_ns = -1; |
f721889f RW |
1693 | genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; |
1694 | genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; | |
1695 | genpd->domain.ops.runtime_idle = pm_generic_runtime_idle; | |
596ba34b RW |
1696 | genpd->domain.ops.prepare = pm_genpd_prepare; |
1697 | genpd->domain.ops.suspend = pm_genpd_suspend; | |
0496c8ae | 1698 | genpd->domain.ops.suspend_late = pm_genpd_suspend_late; |
596ba34b RW |
1699 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; |
1700 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; | |
0496c8ae | 1701 | genpd->domain.ops.resume_early = pm_genpd_resume_early; |
596ba34b RW |
1702 | genpd->domain.ops.resume = pm_genpd_resume; |
1703 | genpd->domain.ops.freeze = pm_genpd_freeze; | |
0496c8ae | 1704 | genpd->domain.ops.freeze_late = pm_genpd_freeze_late; |
596ba34b RW |
1705 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; |
1706 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; | |
0496c8ae | 1707 | genpd->domain.ops.thaw_early = pm_genpd_thaw_early; |
596ba34b | 1708 | genpd->domain.ops.thaw = pm_genpd_thaw; |
d23b9b00 | 1709 | genpd->domain.ops.poweroff = pm_genpd_suspend; |
0496c8ae | 1710 | genpd->domain.ops.poweroff_late = pm_genpd_suspend_late; |
d23b9b00 | 1711 | genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq; |
596ba34b | 1712 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; |
0496c8ae | 1713 | genpd->domain.ops.restore_early = pm_genpd_resume_early; |
d23b9b00 | 1714 | genpd->domain.ops.restore = pm_genpd_resume; |
596ba34b | 1715 | genpd->domain.ops.complete = pm_genpd_complete; |
ecf00475 RW |
1716 | genpd->dev_ops.save_state = pm_genpd_default_save_state; |
1717 | genpd->dev_ops.restore_state = pm_genpd_default_restore_state; | |
c9914854 RW |
1718 | genpd->dev_ops.suspend = pm_genpd_default_suspend; |
1719 | genpd->dev_ops.suspend_late = pm_genpd_default_suspend_late; | |
1720 | genpd->dev_ops.resume_early = pm_genpd_default_resume_early; | |
1721 | genpd->dev_ops.resume = pm_genpd_default_resume; | |
d23b9b00 RW |
1722 | genpd->dev_ops.freeze = pm_genpd_default_freeze; |
1723 | genpd->dev_ops.freeze_late = pm_genpd_default_freeze_late; | |
1724 | genpd->dev_ops.thaw_early = pm_genpd_default_thaw_early; | |
1725 | genpd->dev_ops.thaw = pm_genpd_default_thaw; | |
5125bbf3 RW |
1726 | mutex_lock(&gpd_list_lock); |
1727 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1728 | mutex_unlock(&gpd_list_lock); | |
1729 | } |