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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * drivers/base/power/main.c - Where the driver meets power management. | |
3 | * | |
4 | * Copyright (c) 2003 Patrick Mochel | |
5 | * Copyright (c) 2003 Open Source Development Lab | |
6 | * | |
7 | * This file is released under the GPLv2 | |
8 | * | |
9 | * | |
10 | * The driver model core calls device_pm_add() when a device is registered. | |
b595076a | 11 | * This will initialize the embedded device_pm_info object in the device |
1da177e4 LT |
12 | * and add it to the list of power-controlled devices. sysfs entries for |
13 | * controlling device power management will also be added. | |
14 | * | |
1eede070 RW |
15 | * A separate list is used for keeping track of power info, because the power |
16 | * domain dependencies may differ from the ancestral dependencies that the | |
17 | * subsystem list maintains. | |
1da177e4 LT |
18 | */ |
19 | ||
1da177e4 | 20 | #include <linux/device.h> |
cd59abfc | 21 | #include <linux/kallsyms.h> |
11048dcf | 22 | #include <linux/mutex.h> |
cd59abfc | 23 | #include <linux/pm.h> |
5e928f77 | 24 | #include <linux/pm_runtime.h> |
cd59abfc | 25 | #include <linux/resume-trace.h> |
2ed8d2b3 | 26 | #include <linux/interrupt.h> |
f2511774 | 27 | #include <linux/sched.h> |
5af84b82 | 28 | #include <linux/async.h> |
1e75227e | 29 | #include <linux/suspend.h> |
11048dcf | 30 | |
cd59abfc | 31 | #include "../base.h" |
1da177e4 LT |
32 | #include "power.h" |
33 | ||
775b64d2 | 34 | /* |
1eede070 | 35 | * The entries in the dpm_list list are in a depth first order, simply |
775b64d2 RW |
36 | * because children are guaranteed to be discovered after parents, and |
37 | * are inserted at the back of the list on discovery. | |
38 | * | |
8e9394ce GKH |
39 | * Since device_pm_add() may be called with a device lock held, |
40 | * we must never try to acquire a device lock while holding | |
775b64d2 RW |
41 | * dpm_list_mutex. |
42 | */ | |
43 | ||
1eede070 | 44 | LIST_HEAD(dpm_list); |
8a43a9ab RW |
45 | LIST_HEAD(dpm_prepared_list); |
46 | LIST_HEAD(dpm_suspended_list); | |
47 | LIST_HEAD(dpm_noirq_list); | |
1da177e4 | 48 | |
cd59abfc | 49 | static DEFINE_MUTEX(dpm_list_mtx); |
5af84b82 | 50 | static pm_message_t pm_transition; |
1da177e4 | 51 | |
098dff73 RW |
52 | static int async_error; |
53 | ||
5e928f77 | 54 | /** |
20d652d7 | 55 | * device_pm_init - Initialize the PM-related part of a device object. |
5e928f77 RW |
56 | * @dev: Device object being initialized. |
57 | */ | |
58 | void device_pm_init(struct device *dev) | |
59 | { | |
f76b168b | 60 | dev->power.is_prepared = false; |
5af84b82 | 61 | init_completion(&dev->power.completion); |
152e1d59 | 62 | complete_all(&dev->power.completion); |
074037ec RW |
63 | dev->power.wakeup = NULL; |
64 | spin_lock_init(&dev->power.lock); | |
5e928f77 | 65 | pm_runtime_init(dev); |
22110faf | 66 | INIT_LIST_HEAD(&dev->power.entry); |
5e928f77 RW |
67 | } |
68 | ||
1eede070 | 69 | /** |
20d652d7 | 70 | * device_pm_lock - Lock the list of active devices used by the PM core. |
1eede070 RW |
71 | */ |
72 | void device_pm_lock(void) | |
73 | { | |
74 | mutex_lock(&dpm_list_mtx); | |
75 | } | |
76 | ||
77 | /** | |
20d652d7 | 78 | * device_pm_unlock - Unlock the list of active devices used by the PM core. |
1eede070 RW |
79 | */ |
80 | void device_pm_unlock(void) | |
81 | { | |
82 | mutex_unlock(&dpm_list_mtx); | |
83 | } | |
075c1771 | 84 | |
775b64d2 | 85 | /** |
20d652d7 RW |
86 | * device_pm_add - Add a device to the PM core's list of active devices. |
87 | * @dev: Device to add to the list. | |
775b64d2 | 88 | */ |
3b98aeaf | 89 | void device_pm_add(struct device *dev) |
1da177e4 | 90 | { |
1da177e4 | 91 | pr_debug("PM: Adding info for %s:%s\n", |
5c1a07ab | 92 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
11048dcf | 93 | mutex_lock(&dpm_list_mtx); |
f76b168b | 94 | if (dev->parent && dev->parent->power.is_prepared) |
b64959e6 RW |
95 | dev_warn(dev, "parent %s should not be sleeping\n", |
96 | dev_name(dev->parent)); | |
3b98aeaf | 97 | list_add_tail(&dev->power.entry, &dpm_list); |
11048dcf | 98 | mutex_unlock(&dpm_list_mtx); |
1da177e4 LT |
99 | } |
100 | ||
775b64d2 | 101 | /** |
20d652d7 RW |
102 | * device_pm_remove - Remove a device from the PM core's list of active devices. |
103 | * @dev: Device to be removed from the list. | |
775b64d2 | 104 | */ |
9cddad77 | 105 | void device_pm_remove(struct device *dev) |
1da177e4 LT |
106 | { |
107 | pr_debug("PM: Removing info for %s:%s\n", | |
5c1a07ab | 108 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
5af84b82 | 109 | complete_all(&dev->power.completion); |
11048dcf | 110 | mutex_lock(&dpm_list_mtx); |
1da177e4 | 111 | list_del_init(&dev->power.entry); |
11048dcf | 112 | mutex_unlock(&dpm_list_mtx); |
074037ec | 113 | device_wakeup_disable(dev); |
5e928f77 | 114 | pm_runtime_remove(dev); |
775b64d2 RW |
115 | } |
116 | ||
ffa6a705 | 117 | /** |
20d652d7 RW |
118 | * device_pm_move_before - Move device in the PM core's list of active devices. |
119 | * @deva: Device to move in dpm_list. | |
120 | * @devb: Device @deva should come before. | |
ffa6a705 CH |
121 | */ |
122 | void device_pm_move_before(struct device *deva, struct device *devb) | |
123 | { | |
124 | pr_debug("PM: Moving %s:%s before %s:%s\n", | |
5c1a07ab RW |
125 | deva->bus ? deva->bus->name : "No Bus", dev_name(deva), |
126 | devb->bus ? devb->bus->name : "No Bus", dev_name(devb)); | |
ffa6a705 CH |
127 | /* Delete deva from dpm_list and reinsert before devb. */ |
128 | list_move_tail(&deva->power.entry, &devb->power.entry); | |
129 | } | |
130 | ||
131 | /** | |
20d652d7 RW |
132 | * device_pm_move_after - Move device in the PM core's list of active devices. |
133 | * @deva: Device to move in dpm_list. | |
134 | * @devb: Device @deva should come after. | |
ffa6a705 CH |
135 | */ |
136 | void device_pm_move_after(struct device *deva, struct device *devb) | |
137 | { | |
138 | pr_debug("PM: Moving %s:%s after %s:%s\n", | |
5c1a07ab RW |
139 | deva->bus ? deva->bus->name : "No Bus", dev_name(deva), |
140 | devb->bus ? devb->bus->name : "No Bus", dev_name(devb)); | |
ffa6a705 CH |
141 | /* Delete deva from dpm_list and reinsert after devb. */ |
142 | list_move(&deva->power.entry, &devb->power.entry); | |
143 | } | |
144 | ||
145 | /** | |
20d652d7 RW |
146 | * device_pm_move_last - Move device to end of the PM core's list of devices. |
147 | * @dev: Device to move in dpm_list. | |
ffa6a705 CH |
148 | */ |
149 | void device_pm_move_last(struct device *dev) | |
150 | { | |
151 | pr_debug("PM: Moving %s:%s to end of list\n", | |
5c1a07ab | 152 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
ffa6a705 CH |
153 | list_move_tail(&dev->power.entry, &dpm_list); |
154 | } | |
155 | ||
875ab0b7 RW |
156 | static ktime_t initcall_debug_start(struct device *dev) |
157 | { | |
158 | ktime_t calltime = ktime_set(0, 0); | |
159 | ||
160 | if (initcall_debug) { | |
161 | pr_info("calling %s+ @ %i\n", | |
162 | dev_name(dev), task_pid_nr(current)); | |
163 | calltime = ktime_get(); | |
164 | } | |
165 | ||
166 | return calltime; | |
167 | } | |
168 | ||
169 | static void initcall_debug_report(struct device *dev, ktime_t calltime, | |
170 | int error) | |
171 | { | |
172 | ktime_t delta, rettime; | |
173 | ||
174 | if (initcall_debug) { | |
175 | rettime = ktime_get(); | |
176 | delta = ktime_sub(rettime, calltime); | |
177 | pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev), | |
178 | error, (unsigned long long)ktime_to_ns(delta) >> 10); | |
179 | } | |
180 | } | |
181 | ||
5af84b82 RW |
182 | /** |
183 | * dpm_wait - Wait for a PM operation to complete. | |
184 | * @dev: Device to wait for. | |
185 | * @async: If unset, wait only if the device's power.async_suspend flag is set. | |
186 | */ | |
187 | static void dpm_wait(struct device *dev, bool async) | |
188 | { | |
189 | if (!dev) | |
190 | return; | |
191 | ||
0e06b4a8 | 192 | if (async || (pm_async_enabled && dev->power.async_suspend)) |
5af84b82 RW |
193 | wait_for_completion(&dev->power.completion); |
194 | } | |
195 | ||
196 | static int dpm_wait_fn(struct device *dev, void *async_ptr) | |
197 | { | |
198 | dpm_wait(dev, *((bool *)async_ptr)); | |
199 | return 0; | |
200 | } | |
201 | ||
202 | static void dpm_wait_for_children(struct device *dev, bool async) | |
203 | { | |
204 | device_for_each_child(dev, &async, dpm_wait_fn); | |
205 | } | |
206 | ||
1eede070 | 207 | /** |
20d652d7 RW |
208 | * pm_op - Execute the PM operation appropriate for given PM event. |
209 | * @dev: Device to handle. | |
210 | * @ops: PM operations to choose from. | |
211 | * @state: PM transition of the system being carried out. | |
1eede070 | 212 | */ |
d9ab7716 DT |
213 | static int pm_op(struct device *dev, |
214 | const struct dev_pm_ops *ops, | |
215 | pm_message_t state) | |
1eede070 RW |
216 | { |
217 | int error = 0; | |
875ab0b7 | 218 | ktime_t calltime; |
f2511774 | 219 | |
875ab0b7 | 220 | calltime = initcall_debug_start(dev); |
1eede070 RW |
221 | |
222 | switch (state.event) { | |
223 | #ifdef CONFIG_SUSPEND | |
224 | case PM_EVENT_SUSPEND: | |
225 | if (ops->suspend) { | |
226 | error = ops->suspend(dev); | |
227 | suspend_report_result(ops->suspend, error); | |
228 | } | |
229 | break; | |
230 | case PM_EVENT_RESUME: | |
231 | if (ops->resume) { | |
232 | error = ops->resume(dev); | |
233 | suspend_report_result(ops->resume, error); | |
234 | } | |
235 | break; | |
236 | #endif /* CONFIG_SUSPEND */ | |
1f112cee | 237 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
1eede070 RW |
238 | case PM_EVENT_FREEZE: |
239 | case PM_EVENT_QUIESCE: | |
240 | if (ops->freeze) { | |
241 | error = ops->freeze(dev); | |
242 | suspend_report_result(ops->freeze, error); | |
243 | } | |
244 | break; | |
245 | case PM_EVENT_HIBERNATE: | |
246 | if (ops->poweroff) { | |
247 | error = ops->poweroff(dev); | |
248 | suspend_report_result(ops->poweroff, error); | |
249 | } | |
250 | break; | |
251 | case PM_EVENT_THAW: | |
252 | case PM_EVENT_RECOVER: | |
253 | if (ops->thaw) { | |
254 | error = ops->thaw(dev); | |
255 | suspend_report_result(ops->thaw, error); | |
256 | } | |
257 | break; | |
258 | case PM_EVENT_RESTORE: | |
259 | if (ops->restore) { | |
260 | error = ops->restore(dev); | |
261 | suspend_report_result(ops->restore, error); | |
262 | } | |
263 | break; | |
1f112cee | 264 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
1eede070 RW |
265 | default: |
266 | error = -EINVAL; | |
267 | } | |
f2511774 | 268 | |
875ab0b7 | 269 | initcall_debug_report(dev, calltime, error); |
f2511774 | 270 | |
1eede070 RW |
271 | return error; |
272 | } | |
273 | ||
274 | /** | |
20d652d7 RW |
275 | * pm_noirq_op - Execute the PM operation appropriate for given PM event. |
276 | * @dev: Device to handle. | |
277 | * @ops: PM operations to choose from. | |
278 | * @state: PM transition of the system being carried out. | |
1eede070 | 279 | * |
20d652d7 RW |
280 | * The driver of @dev will not receive interrupts while this function is being |
281 | * executed. | |
1eede070 | 282 | */ |
d9ab7716 DT |
283 | static int pm_noirq_op(struct device *dev, |
284 | const struct dev_pm_ops *ops, | |
1eede070 RW |
285 | pm_message_t state) |
286 | { | |
287 | int error = 0; | |
2cbb3ce1 | 288 | ktime_t calltime = ktime_set(0, 0), delta, rettime; |
f2511774 AV |
289 | |
290 | if (initcall_debug) { | |
8cc6b39f RW |
291 | pr_info("calling %s+ @ %i, parent: %s\n", |
292 | dev_name(dev), task_pid_nr(current), | |
293 | dev->parent ? dev_name(dev->parent) : "none"); | |
f2511774 AV |
294 | calltime = ktime_get(); |
295 | } | |
1eede070 RW |
296 | |
297 | switch (state.event) { | |
298 | #ifdef CONFIG_SUSPEND | |
299 | case PM_EVENT_SUSPEND: | |
300 | if (ops->suspend_noirq) { | |
301 | error = ops->suspend_noirq(dev); | |
302 | suspend_report_result(ops->suspend_noirq, error); | |
303 | } | |
304 | break; | |
305 | case PM_EVENT_RESUME: | |
306 | if (ops->resume_noirq) { | |
307 | error = ops->resume_noirq(dev); | |
308 | suspend_report_result(ops->resume_noirq, error); | |
309 | } | |
310 | break; | |
311 | #endif /* CONFIG_SUSPEND */ | |
1f112cee | 312 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
1eede070 RW |
313 | case PM_EVENT_FREEZE: |
314 | case PM_EVENT_QUIESCE: | |
315 | if (ops->freeze_noirq) { | |
316 | error = ops->freeze_noirq(dev); | |
317 | suspend_report_result(ops->freeze_noirq, error); | |
318 | } | |
319 | break; | |
320 | case PM_EVENT_HIBERNATE: | |
321 | if (ops->poweroff_noirq) { | |
322 | error = ops->poweroff_noirq(dev); | |
323 | suspend_report_result(ops->poweroff_noirq, error); | |
324 | } | |
325 | break; | |
326 | case PM_EVENT_THAW: | |
327 | case PM_EVENT_RECOVER: | |
328 | if (ops->thaw_noirq) { | |
329 | error = ops->thaw_noirq(dev); | |
330 | suspend_report_result(ops->thaw_noirq, error); | |
331 | } | |
332 | break; | |
333 | case PM_EVENT_RESTORE: | |
334 | if (ops->restore_noirq) { | |
335 | error = ops->restore_noirq(dev); | |
336 | suspend_report_result(ops->restore_noirq, error); | |
337 | } | |
338 | break; | |
1f112cee | 339 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
1eede070 RW |
340 | default: |
341 | error = -EINVAL; | |
342 | } | |
f2511774 AV |
343 | |
344 | if (initcall_debug) { | |
345 | rettime = ktime_get(); | |
346 | delta = ktime_sub(rettime, calltime); | |
875ab0b7 RW |
347 | printk("initcall %s_i+ returned %d after %Ld usecs\n", |
348 | dev_name(dev), error, | |
349 | (unsigned long long)ktime_to_ns(delta) >> 10); | |
f2511774 AV |
350 | } |
351 | ||
1eede070 RW |
352 | return error; |
353 | } | |
354 | ||
355 | static char *pm_verb(int event) | |
356 | { | |
357 | switch (event) { | |
358 | case PM_EVENT_SUSPEND: | |
359 | return "suspend"; | |
360 | case PM_EVENT_RESUME: | |
361 | return "resume"; | |
362 | case PM_EVENT_FREEZE: | |
363 | return "freeze"; | |
364 | case PM_EVENT_QUIESCE: | |
365 | return "quiesce"; | |
366 | case PM_EVENT_HIBERNATE: | |
367 | return "hibernate"; | |
368 | case PM_EVENT_THAW: | |
369 | return "thaw"; | |
370 | case PM_EVENT_RESTORE: | |
371 | return "restore"; | |
372 | case PM_EVENT_RECOVER: | |
373 | return "recover"; | |
374 | default: | |
375 | return "(unknown PM event)"; | |
376 | } | |
377 | } | |
378 | ||
379 | static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info) | |
380 | { | |
381 | dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event), | |
382 | ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ? | |
383 | ", may wakeup" : ""); | |
384 | } | |
385 | ||
386 | static void pm_dev_err(struct device *dev, pm_message_t state, char *info, | |
387 | int error) | |
388 | { | |
389 | printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n", | |
5c1a07ab | 390 | dev_name(dev), pm_verb(state.event), info, error); |
1eede070 RW |
391 | } |
392 | ||
ecf762b2 RW |
393 | static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info) |
394 | { | |
395 | ktime_t calltime; | |
0702d9ee | 396 | u64 usecs64; |
ecf762b2 RW |
397 | int usecs; |
398 | ||
399 | calltime = ktime_get(); | |
400 | usecs64 = ktime_to_ns(ktime_sub(calltime, starttime)); | |
401 | do_div(usecs64, NSEC_PER_USEC); | |
402 | usecs = usecs64; | |
403 | if (usecs == 0) | |
404 | usecs = 1; | |
405 | pr_info("PM: %s%s%s of devices complete after %ld.%03ld msecs\n", | |
406 | info ?: "", info ? " " : "", pm_verb(state.event), | |
407 | usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC); | |
408 | } | |
409 | ||
cd59abfc AS |
410 | /*------------------------- Resume routines -------------------------*/ |
411 | ||
412 | /** | |
20d652d7 RW |
413 | * device_resume_noirq - Execute an "early resume" callback for given device. |
414 | * @dev: Device to handle. | |
415 | * @state: PM transition of the system being carried out. | |
cd59abfc | 416 | * |
20d652d7 RW |
417 | * The driver of @dev will not receive interrupts while this function is being |
418 | * executed. | |
cd59abfc | 419 | */ |
d1616302 | 420 | static int device_resume_noirq(struct device *dev, pm_message_t state) |
cd59abfc AS |
421 | { |
422 | int error = 0; | |
423 | ||
424 | TRACE_DEVICE(dev); | |
425 | TRACE_RESUME(0); | |
426 | ||
7538e3db RW |
427 | if (dev->pwr_domain) { |
428 | pm_dev_dbg(dev, state, "EARLY power domain "); | |
4d27e9dc RW |
429 | error = pm_noirq_op(dev, &dev->pwr_domain->ops, state); |
430 | } else if (dev->type && dev->type->pm) { | |
e7176a37 DB |
431 | pm_dev_dbg(dev, state, "EARLY type "); |
432 | error = pm_noirq_op(dev, dev->type->pm, state); | |
9659cc06 | 433 | } else if (dev->class && dev->class->pm) { |
e7176a37 DB |
434 | pm_dev_dbg(dev, state, "EARLY class "); |
435 | error = pm_noirq_op(dev, dev->class->pm, state); | |
9659cc06 RW |
436 | } else if (dev->bus && dev->bus->pm) { |
437 | pm_dev_dbg(dev, state, "EARLY "); | |
438 | error = pm_noirq_op(dev, dev->bus->pm, state); | |
e7176a37 DB |
439 | } |
440 | ||
775b64d2 RW |
441 | TRACE_RESUME(error); |
442 | return error; | |
443 | } | |
444 | ||
445 | /** | |
20d652d7 RW |
446 | * dpm_resume_noirq - Execute "early resume" callbacks for non-sysdev devices. |
447 | * @state: PM transition of the system being carried out. | |
775b64d2 | 448 | * |
20d652d7 RW |
449 | * Call the "noirq" resume handlers for all devices marked as DPM_OFF_IRQ and |
450 | * enable device drivers to receive interrupts. | |
775b64d2 | 451 | */ |
d1616302 | 452 | void dpm_resume_noirq(pm_message_t state) |
775b64d2 | 453 | { |
ecf762b2 | 454 | ktime_t starttime = ktime_get(); |
775b64d2 | 455 | |
32bdfac5 | 456 | mutex_lock(&dpm_list_mtx); |
8a43a9ab RW |
457 | while (!list_empty(&dpm_noirq_list)) { |
458 | struct device *dev = to_device(dpm_noirq_list.next); | |
5b219a51 | 459 | int error; |
d08a5ace RW |
460 | |
461 | get_device(dev); | |
5b219a51 RW |
462 | list_move_tail(&dev->power.entry, &dpm_suspended_list); |
463 | mutex_unlock(&dpm_list_mtx); | |
d08a5ace | 464 | |
5b219a51 RW |
465 | error = device_resume_noirq(dev, state); |
466 | if (error) | |
467 | pm_dev_err(dev, state, " early", error); | |
d08a5ace | 468 | |
5b219a51 | 469 | mutex_lock(&dpm_list_mtx); |
d08a5ace RW |
470 | put_device(dev); |
471 | } | |
32bdfac5 | 472 | mutex_unlock(&dpm_list_mtx); |
ecf762b2 | 473 | dpm_show_time(starttime, state, "early"); |
2ed8d2b3 | 474 | resume_device_irqs(); |
775b64d2 | 475 | } |
d1616302 | 476 | EXPORT_SYMBOL_GPL(dpm_resume_noirq); |
775b64d2 | 477 | |
875ab0b7 RW |
478 | /** |
479 | * legacy_resume - Execute a legacy (bus or class) resume callback for device. | |
0a884223 RD |
480 | * @dev: Device to resume. |
481 | * @cb: Resume callback to execute. | |
875ab0b7 RW |
482 | */ |
483 | static int legacy_resume(struct device *dev, int (*cb)(struct device *dev)) | |
484 | { | |
485 | int error; | |
486 | ktime_t calltime; | |
487 | ||
488 | calltime = initcall_debug_start(dev); | |
489 | ||
490 | error = cb(dev); | |
491 | suspend_report_result(cb, error); | |
492 | ||
493 | initcall_debug_report(dev, calltime, error); | |
494 | ||
495 | return error; | |
496 | } | |
497 | ||
775b64d2 | 498 | /** |
97df8c12 | 499 | * device_resume - Execute "resume" callbacks for given device. |
20d652d7 RW |
500 | * @dev: Device to handle. |
501 | * @state: PM transition of the system being carried out. | |
5af84b82 | 502 | * @async: If true, the device is being resumed asynchronously. |
775b64d2 | 503 | */ |
97df8c12 | 504 | static int device_resume(struct device *dev, pm_message_t state, bool async) |
775b64d2 RW |
505 | { |
506 | int error = 0; | |
507 | ||
508 | TRACE_DEVICE(dev); | |
509 | TRACE_RESUME(0); | |
cd59abfc | 510 | |
5af84b82 | 511 | dpm_wait(dev->parent, async); |
8e9394ce | 512 | device_lock(dev); |
7a8d37a3 | 513 | |
f76b168b AS |
514 | /* |
515 | * This is a fib. But we'll allow new children to be added below | |
516 | * a resumed device, even if the device hasn't been completed yet. | |
517 | */ | |
518 | dev->power.is_prepared = false; | |
97df8c12 | 519 | |
7538e3db RW |
520 | if (dev->pwr_domain) { |
521 | pm_dev_dbg(dev, state, "power domain "); | |
4d27e9dc RW |
522 | error = pm_op(dev, &dev->pwr_domain->ops, state); |
523 | goto End; | |
7538e3db RW |
524 | } |
525 | ||
9659cc06 RW |
526 | if (dev->type && dev->type->pm) { |
527 | pm_dev_dbg(dev, state, "type "); | |
528 | error = pm_op(dev, dev->type->pm, state); | |
529 | goto End; | |
cd59abfc AS |
530 | } |
531 | ||
1eede070 RW |
532 | if (dev->class) { |
533 | if (dev->class->pm) { | |
534 | pm_dev_dbg(dev, state, "class "); | |
535 | error = pm_op(dev, dev->class->pm, state); | |
9659cc06 | 536 | goto End; |
1eede070 RW |
537 | } else if (dev->class->resume) { |
538 | pm_dev_dbg(dev, state, "legacy class "); | |
875ab0b7 | 539 | error = legacy_resume(dev, dev->class->resume); |
9659cc06 | 540 | goto End; |
1eede070 | 541 | } |
cd59abfc | 542 | } |
9659cc06 RW |
543 | |
544 | if (dev->bus) { | |
545 | if (dev->bus->pm) { | |
546 | pm_dev_dbg(dev, state, ""); | |
547 | error = pm_op(dev, dev->bus->pm, state); | |
548 | } else if (dev->bus->resume) { | |
549 | pm_dev_dbg(dev, state, "legacy "); | |
550 | error = legacy_resume(dev, dev->bus->resume); | |
551 | } | |
552 | } | |
553 | ||
1eede070 | 554 | End: |
8e9394ce | 555 | device_unlock(dev); |
5af84b82 | 556 | complete_all(&dev->power.completion); |
7a8d37a3 | 557 | |
cd59abfc AS |
558 | TRACE_RESUME(error); |
559 | return error; | |
560 | } | |
561 | ||
5af84b82 RW |
562 | static void async_resume(void *data, async_cookie_t cookie) |
563 | { | |
564 | struct device *dev = (struct device *)data; | |
565 | int error; | |
566 | ||
97df8c12 | 567 | error = device_resume(dev, pm_transition, true); |
5af84b82 RW |
568 | if (error) |
569 | pm_dev_err(dev, pm_transition, " async", error); | |
570 | put_device(dev); | |
571 | } | |
572 | ||
97df8c12 | 573 | static bool is_async(struct device *dev) |
5af84b82 | 574 | { |
97df8c12 RW |
575 | return dev->power.async_suspend && pm_async_enabled |
576 | && !pm_trace_is_enabled(); | |
5af84b82 RW |
577 | } |
578 | ||
775b64d2 | 579 | /** |
20d652d7 RW |
580 | * dpm_resume - Execute "resume" callbacks for non-sysdev devices. |
581 | * @state: PM transition of the system being carried out. | |
775b64d2 | 582 | * |
20d652d7 RW |
583 | * Execute the appropriate "resume" callback for all devices whose status |
584 | * indicates that they are suspended. | |
1eede070 | 585 | */ |
91e7c75b | 586 | void dpm_resume(pm_message_t state) |
1eede070 | 587 | { |
97df8c12 | 588 | struct device *dev; |
ecf762b2 | 589 | ktime_t starttime = ktime_get(); |
1eede070 | 590 | |
91e7c75b RW |
591 | might_sleep(); |
592 | ||
1eede070 | 593 | mutex_lock(&dpm_list_mtx); |
5af84b82 | 594 | pm_transition = state; |
098dff73 | 595 | async_error = 0; |
1eede070 | 596 | |
8a43a9ab | 597 | list_for_each_entry(dev, &dpm_suspended_list, power.entry) { |
97df8c12 RW |
598 | INIT_COMPLETION(dev->power.completion); |
599 | if (is_async(dev)) { | |
600 | get_device(dev); | |
601 | async_schedule(async_resume, dev); | |
602 | } | |
603 | } | |
604 | ||
8a43a9ab RW |
605 | while (!list_empty(&dpm_suspended_list)) { |
606 | dev = to_device(dpm_suspended_list.next); | |
1eede070 | 607 | get_device(dev); |
5b219a51 | 608 | if (!is_async(dev)) { |
1eede070 RW |
609 | int error; |
610 | ||
1eede070 RW |
611 | mutex_unlock(&dpm_list_mtx); |
612 | ||
97df8c12 | 613 | error = device_resume(dev, state, false); |
1eede070 RW |
614 | if (error) |
615 | pm_dev_err(dev, state, "", error); | |
5b219a51 RW |
616 | |
617 | mutex_lock(&dpm_list_mtx); | |
1eede070 RW |
618 | } |
619 | if (!list_empty(&dev->power.entry)) | |
8a43a9ab | 620 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
621 | put_device(dev); |
622 | } | |
1eede070 | 623 | mutex_unlock(&dpm_list_mtx); |
5af84b82 | 624 | async_synchronize_full(); |
ecf762b2 | 625 | dpm_show_time(starttime, state, NULL); |
1eede070 RW |
626 | } |
627 | ||
628 | /** | |
20d652d7 RW |
629 | * device_complete - Complete a PM transition for given device. |
630 | * @dev: Device to handle. | |
631 | * @state: PM transition of the system being carried out. | |
1eede070 | 632 | */ |
d1616302 | 633 | static void device_complete(struct device *dev, pm_message_t state) |
1eede070 | 634 | { |
8e9394ce | 635 | device_lock(dev); |
1eede070 | 636 | |
4d27e9dc | 637 | if (dev->pwr_domain) { |
7538e3db | 638 | pm_dev_dbg(dev, state, "completing power domain "); |
4d27e9dc RW |
639 | if (dev->pwr_domain->ops.complete) |
640 | dev->pwr_domain->ops.complete(dev); | |
641 | } else if (dev->type && dev->type->pm) { | |
1eede070 | 642 | pm_dev_dbg(dev, state, "completing type "); |
9659cc06 RW |
643 | if (dev->type->pm->complete) |
644 | dev->type->pm->complete(dev); | |
645 | } else if (dev->class && dev->class->pm) { | |
646 | pm_dev_dbg(dev, state, "completing class "); | |
647 | if (dev->class->pm->complete) | |
648 | dev->class->pm->complete(dev); | |
649 | } else if (dev->bus && dev->bus->pm) { | |
1eede070 | 650 | pm_dev_dbg(dev, state, "completing "); |
9659cc06 RW |
651 | if (dev->bus->pm->complete) |
652 | dev->bus->pm->complete(dev); | |
1eede070 RW |
653 | } |
654 | ||
8e9394ce | 655 | device_unlock(dev); |
1eede070 RW |
656 | } |
657 | ||
658 | /** | |
20d652d7 RW |
659 | * dpm_complete - Complete a PM transition for all non-sysdev devices. |
660 | * @state: PM transition of the system being carried out. | |
775b64d2 | 661 | * |
20d652d7 RW |
662 | * Execute the ->complete() callbacks for all devices whose PM status is not |
663 | * DPM_ON (this allows new devices to be registered). | |
cd59abfc | 664 | */ |
91e7c75b | 665 | void dpm_complete(pm_message_t state) |
cd59abfc | 666 | { |
1eede070 RW |
667 | struct list_head list; |
668 | ||
91e7c75b RW |
669 | might_sleep(); |
670 | ||
1eede070 | 671 | INIT_LIST_HEAD(&list); |
cd59abfc | 672 | mutex_lock(&dpm_list_mtx); |
8a43a9ab RW |
673 | while (!list_empty(&dpm_prepared_list)) { |
674 | struct device *dev = to_device(dpm_prepared_list.prev); | |
cd59abfc | 675 | |
1eede070 | 676 | get_device(dev); |
f76b168b | 677 | dev->power.is_prepared = false; |
5b219a51 RW |
678 | list_move(&dev->power.entry, &list); |
679 | mutex_unlock(&dpm_list_mtx); | |
1eede070 | 680 | |
5b219a51 | 681 | device_complete(dev, state); |
1eede070 | 682 | |
5b219a51 | 683 | mutex_lock(&dpm_list_mtx); |
1eede070 | 684 | put_device(dev); |
cd59abfc | 685 | } |
1eede070 | 686 | list_splice(&list, &dpm_list); |
cd59abfc AS |
687 | mutex_unlock(&dpm_list_mtx); |
688 | } | |
689 | ||
cd59abfc | 690 | /** |
20d652d7 RW |
691 | * dpm_resume_end - Execute "resume" callbacks and complete system transition. |
692 | * @state: PM transition of the system being carried out. | |
cd59abfc | 693 | * |
20d652d7 RW |
694 | * Execute "resume" callbacks for all devices and complete the PM transition of |
695 | * the system. | |
cd59abfc | 696 | */ |
d1616302 | 697 | void dpm_resume_end(pm_message_t state) |
cd59abfc | 698 | { |
1eede070 RW |
699 | dpm_resume(state); |
700 | dpm_complete(state); | |
cd59abfc | 701 | } |
d1616302 | 702 | EXPORT_SYMBOL_GPL(dpm_resume_end); |
cd59abfc AS |
703 | |
704 | ||
705 | /*------------------------- Suspend routines -------------------------*/ | |
706 | ||
1eede070 | 707 | /** |
20d652d7 RW |
708 | * resume_event - Return a "resume" message for given "suspend" sleep state. |
709 | * @sleep_state: PM message representing a sleep state. | |
710 | * | |
711 | * Return a PM message representing the resume event corresponding to given | |
712 | * sleep state. | |
1eede070 RW |
713 | */ |
714 | static pm_message_t resume_event(pm_message_t sleep_state) | |
cd59abfc | 715 | { |
1eede070 RW |
716 | switch (sleep_state.event) { |
717 | case PM_EVENT_SUSPEND: | |
718 | return PMSG_RESUME; | |
719 | case PM_EVENT_FREEZE: | |
720 | case PM_EVENT_QUIESCE: | |
721 | return PMSG_RECOVER; | |
722 | case PM_EVENT_HIBERNATE: | |
723 | return PMSG_RESTORE; | |
cd59abfc | 724 | } |
1eede070 | 725 | return PMSG_ON; |
cd59abfc AS |
726 | } |
727 | ||
728 | /** | |
20d652d7 RW |
729 | * device_suspend_noirq - Execute a "late suspend" callback for given device. |
730 | * @dev: Device to handle. | |
731 | * @state: PM transition of the system being carried out. | |
775b64d2 | 732 | * |
20d652d7 RW |
733 | * The driver of @dev will not receive interrupts while this function is being |
734 | * executed. | |
cd59abfc | 735 | */ |
d1616302 | 736 | static int device_suspend_noirq(struct device *dev, pm_message_t state) |
775b64d2 | 737 | { |
9659cc06 | 738 | int error; |
e7176a37 | 739 | |
4d27e9dc RW |
740 | if (dev->pwr_domain) { |
741 | pm_dev_dbg(dev, state, "LATE power domain "); | |
742 | error = pm_noirq_op(dev, &dev->pwr_domain->ops, state); | |
743 | if (error) | |
744 | return error; | |
745 | } else if (dev->type && dev->type->pm) { | |
e7176a37 DB |
746 | pm_dev_dbg(dev, state, "LATE type "); |
747 | error = pm_noirq_op(dev, dev->type->pm, state); | |
748 | if (error) | |
9659cc06 RW |
749 | return error; |
750 | } else if (dev->class && dev->class->pm) { | |
751 | pm_dev_dbg(dev, state, "LATE class "); | |
752 | error = pm_noirq_op(dev, dev->class->pm, state); | |
753 | if (error) | |
754 | return error; | |
755 | } else if (dev->bus && dev->bus->pm) { | |
1eede070 RW |
756 | pm_dev_dbg(dev, state, "LATE "); |
757 | error = pm_noirq_op(dev, dev->bus->pm, state); | |
7538e3db | 758 | if (error) |
9659cc06 | 759 | return error; |
7538e3db RW |
760 | } |
761 | ||
9659cc06 | 762 | return 0; |
775b64d2 RW |
763 | } |
764 | ||
765 | /** | |
20d652d7 RW |
766 | * dpm_suspend_noirq - Execute "late suspend" callbacks for non-sysdev devices. |
767 | * @state: PM transition of the system being carried out. | |
775b64d2 | 768 | * |
20d652d7 RW |
769 | * Prevent device drivers from receiving interrupts and call the "noirq" suspend |
770 | * handlers for all non-sysdev devices. | |
775b64d2 | 771 | */ |
d1616302 | 772 | int dpm_suspend_noirq(pm_message_t state) |
775b64d2 | 773 | { |
ecf762b2 | 774 | ktime_t starttime = ktime_get(); |
775b64d2 RW |
775 | int error = 0; |
776 | ||
2ed8d2b3 | 777 | suspend_device_irqs(); |
32bdfac5 | 778 | mutex_lock(&dpm_list_mtx); |
8a43a9ab RW |
779 | while (!list_empty(&dpm_suspended_list)) { |
780 | struct device *dev = to_device(dpm_suspended_list.prev); | |
d08a5ace RW |
781 | |
782 | get_device(dev); | |
783 | mutex_unlock(&dpm_list_mtx); | |
784 | ||
d1616302 | 785 | error = device_suspend_noirq(dev, state); |
d08a5ace RW |
786 | |
787 | mutex_lock(&dpm_list_mtx); | |
775b64d2 | 788 | if (error) { |
1eede070 | 789 | pm_dev_err(dev, state, " late", error); |
d08a5ace | 790 | put_device(dev); |
775b64d2 RW |
791 | break; |
792 | } | |
d08a5ace | 793 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 794 | list_move(&dev->power.entry, &dpm_noirq_list); |
d08a5ace | 795 | put_device(dev); |
775b64d2 | 796 | } |
32bdfac5 | 797 | mutex_unlock(&dpm_list_mtx); |
775b64d2 | 798 | if (error) |
d1616302 | 799 | dpm_resume_noirq(resume_event(state)); |
ecf762b2 RW |
800 | else |
801 | dpm_show_time(starttime, state, "late"); | |
775b64d2 RW |
802 | return error; |
803 | } | |
d1616302 | 804 | EXPORT_SYMBOL_GPL(dpm_suspend_noirq); |
775b64d2 | 805 | |
875ab0b7 RW |
806 | /** |
807 | * legacy_suspend - Execute a legacy (bus or class) suspend callback for device. | |
0a884223 RD |
808 | * @dev: Device to suspend. |
809 | * @state: PM transition of the system being carried out. | |
810 | * @cb: Suspend callback to execute. | |
875ab0b7 RW |
811 | */ |
812 | static int legacy_suspend(struct device *dev, pm_message_t state, | |
813 | int (*cb)(struct device *dev, pm_message_t state)) | |
814 | { | |
815 | int error; | |
816 | ktime_t calltime; | |
817 | ||
818 | calltime = initcall_debug_start(dev); | |
819 | ||
820 | error = cb(dev, state); | |
821 | suspend_report_result(cb, error); | |
822 | ||
823 | initcall_debug_report(dev, calltime, error); | |
824 | ||
825 | return error; | |
826 | } | |
827 | ||
775b64d2 | 828 | /** |
20d652d7 RW |
829 | * device_suspend - Execute "suspend" callbacks for given device. |
830 | * @dev: Device to handle. | |
831 | * @state: PM transition of the system being carried out. | |
5af84b82 | 832 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 833 | */ |
5af84b82 | 834 | static int __device_suspend(struct device *dev, pm_message_t state, bool async) |
cd59abfc AS |
835 | { |
836 | int error = 0; | |
837 | ||
5af84b82 | 838 | dpm_wait_for_children(dev, async); |
8e9394ce | 839 | device_lock(dev); |
7a8d37a3 | 840 | |
5af84b82 RW |
841 | if (async_error) |
842 | goto End; | |
843 | ||
d83f905e RW |
844 | if (pm_wakeup_pending()) { |
845 | async_error = -EBUSY; | |
846 | goto End; | |
847 | } | |
848 | ||
4d27e9dc RW |
849 | if (dev->pwr_domain) { |
850 | pm_dev_dbg(dev, state, "power domain "); | |
851 | error = pm_op(dev, &dev->pwr_domain->ops, state); | |
852 | goto End; | |
853 | } | |
854 | ||
9659cc06 RW |
855 | if (dev->type && dev->type->pm) { |
856 | pm_dev_dbg(dev, state, "type "); | |
857 | error = pm_op(dev, dev->type->pm, state); | |
4d27e9dc | 858 | goto End; |
9659cc06 RW |
859 | } |
860 | ||
1eede070 RW |
861 | if (dev->class) { |
862 | if (dev->class->pm) { | |
863 | pm_dev_dbg(dev, state, "class "); | |
864 | error = pm_op(dev, dev->class->pm, state); | |
4d27e9dc | 865 | goto End; |
1eede070 RW |
866 | } else if (dev->class->suspend) { |
867 | pm_dev_dbg(dev, state, "legacy class "); | |
875ab0b7 | 868 | error = legacy_suspend(dev, state, dev->class->suspend); |
4d27e9dc | 869 | goto End; |
1eede070 | 870 | } |
cd59abfc AS |
871 | } |
872 | ||
1eede070 RW |
873 | if (dev->bus) { |
874 | if (dev->bus->pm) { | |
875 | pm_dev_dbg(dev, state, ""); | |
adf09493 | 876 | error = pm_op(dev, dev->bus->pm, state); |
1eede070 RW |
877 | } else if (dev->bus->suspend) { |
878 | pm_dev_dbg(dev, state, "legacy "); | |
875ab0b7 | 879 | error = legacy_suspend(dev, state, dev->bus->suspend); |
1eede070 | 880 | } |
7538e3db RW |
881 | } |
882 | ||
1eede070 | 883 | End: |
8e9394ce | 884 | device_unlock(dev); |
5af84b82 | 885 | complete_all(&dev->power.completion); |
7a8d37a3 | 886 | |
098dff73 RW |
887 | if (error) |
888 | async_error = error; | |
889 | ||
cd59abfc AS |
890 | return error; |
891 | } | |
892 | ||
5af84b82 RW |
893 | static void async_suspend(void *data, async_cookie_t cookie) |
894 | { | |
895 | struct device *dev = (struct device *)data; | |
896 | int error; | |
897 | ||
898 | error = __device_suspend(dev, pm_transition, true); | |
098dff73 | 899 | if (error) |
5af84b82 | 900 | pm_dev_err(dev, pm_transition, " async", error); |
5af84b82 RW |
901 | |
902 | put_device(dev); | |
903 | } | |
904 | ||
905 | static int device_suspend(struct device *dev) | |
906 | { | |
907 | INIT_COMPLETION(dev->power.completion); | |
908 | ||
0e06b4a8 | 909 | if (pm_async_enabled && dev->power.async_suspend) { |
5af84b82 RW |
910 | get_device(dev); |
911 | async_schedule(async_suspend, dev); | |
912 | return 0; | |
913 | } | |
914 | ||
915 | return __device_suspend(dev, pm_transition, false); | |
916 | } | |
917 | ||
cd59abfc | 918 | /** |
20d652d7 RW |
919 | * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices. |
920 | * @state: PM transition of the system being carried out. | |
cd59abfc | 921 | */ |
91e7c75b | 922 | int dpm_suspend(pm_message_t state) |
cd59abfc | 923 | { |
ecf762b2 | 924 | ktime_t starttime = ktime_get(); |
cd59abfc AS |
925 | int error = 0; |
926 | ||
91e7c75b RW |
927 | might_sleep(); |
928 | ||
cd59abfc | 929 | mutex_lock(&dpm_list_mtx); |
5af84b82 RW |
930 | pm_transition = state; |
931 | async_error = 0; | |
8a43a9ab RW |
932 | while (!list_empty(&dpm_prepared_list)) { |
933 | struct device *dev = to_device(dpm_prepared_list.prev); | |
58aca232 | 934 | |
1eede070 | 935 | get_device(dev); |
cd59abfc | 936 | mutex_unlock(&dpm_list_mtx); |
1eede070 | 937 | |
5af84b82 | 938 | error = device_suspend(dev); |
1eede070 | 939 | |
1b3cbec1 | 940 | mutex_lock(&dpm_list_mtx); |
775b64d2 | 941 | if (error) { |
1eede070 RW |
942 | pm_dev_err(dev, state, "", error); |
943 | put_device(dev); | |
775b64d2 RW |
944 | break; |
945 | } | |
7a8d37a3 | 946 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 947 | list_move(&dev->power.entry, &dpm_suspended_list); |
1eede070 | 948 | put_device(dev); |
5af84b82 RW |
949 | if (async_error) |
950 | break; | |
cd59abfc AS |
951 | } |
952 | mutex_unlock(&dpm_list_mtx); | |
5af84b82 RW |
953 | async_synchronize_full(); |
954 | if (!error) | |
955 | error = async_error; | |
ecf762b2 RW |
956 | if (!error) |
957 | dpm_show_time(starttime, state, NULL); | |
1eede070 RW |
958 | return error; |
959 | } | |
960 | ||
961 | /** | |
20d652d7 RW |
962 | * device_prepare - Prepare a device for system power transition. |
963 | * @dev: Device to handle. | |
964 | * @state: PM transition of the system being carried out. | |
965 | * | |
966 | * Execute the ->prepare() callback(s) for given device. No new children of the | |
967 | * device may be registered after this function has returned. | |
1eede070 | 968 | */ |
d1616302 | 969 | static int device_prepare(struct device *dev, pm_message_t state) |
1eede070 RW |
970 | { |
971 | int error = 0; | |
972 | ||
8e9394ce | 973 | device_lock(dev); |
1eede070 | 974 | |
4d27e9dc RW |
975 | if (dev->pwr_domain) { |
976 | pm_dev_dbg(dev, state, "preparing power domain "); | |
977 | if (dev->pwr_domain->ops.prepare) | |
978 | error = dev->pwr_domain->ops.prepare(dev); | |
979 | suspend_report_result(dev->pwr_domain->ops.prepare, error); | |
980 | if (error) | |
981 | goto End; | |
982 | } else if (dev->type && dev->type->pm) { | |
1eede070 | 983 | pm_dev_dbg(dev, state, "preparing type "); |
9659cc06 RW |
984 | if (dev->type->pm->prepare) |
985 | error = dev->type->pm->prepare(dev); | |
1eede070 RW |
986 | suspend_report_result(dev->type->pm->prepare, error); |
987 | if (error) | |
988 | goto End; | |
9659cc06 | 989 | } else if (dev->class && dev->class->pm) { |
1eede070 | 990 | pm_dev_dbg(dev, state, "preparing class "); |
9659cc06 RW |
991 | if (dev->class->pm->prepare) |
992 | error = dev->class->pm->prepare(dev); | |
1eede070 | 993 | suspend_report_result(dev->class->pm->prepare, error); |
7538e3db RW |
994 | if (error) |
995 | goto End; | |
9659cc06 RW |
996 | } else if (dev->bus && dev->bus->pm) { |
997 | pm_dev_dbg(dev, state, "preparing "); | |
998 | if (dev->bus->pm->prepare) | |
999 | error = dev->bus->pm->prepare(dev); | |
1000 | suspend_report_result(dev->bus->pm->prepare, error); | |
1eede070 | 1001 | } |
7538e3db | 1002 | |
1eede070 | 1003 | End: |
8e9394ce | 1004 | device_unlock(dev); |
1eede070 RW |
1005 | |
1006 | return error; | |
1007 | } | |
cd59abfc | 1008 | |
1eede070 | 1009 | /** |
20d652d7 RW |
1010 | * dpm_prepare - Prepare all non-sysdev devices for a system PM transition. |
1011 | * @state: PM transition of the system being carried out. | |
1eede070 | 1012 | * |
20d652d7 | 1013 | * Execute the ->prepare() callback(s) for all devices. |
1eede070 | 1014 | */ |
91e7c75b | 1015 | int dpm_prepare(pm_message_t state) |
1eede070 | 1016 | { |
1eede070 RW |
1017 | int error = 0; |
1018 | ||
91e7c75b RW |
1019 | might_sleep(); |
1020 | ||
1eede070 | 1021 | mutex_lock(&dpm_list_mtx); |
1eede070 RW |
1022 | while (!list_empty(&dpm_list)) { |
1023 | struct device *dev = to_device(dpm_list.next); | |
1024 | ||
1025 | get_device(dev); | |
1eede070 RW |
1026 | mutex_unlock(&dpm_list_mtx); |
1027 | ||
5e928f77 | 1028 | pm_runtime_get_noresume(dev); |
1e75227e RW |
1029 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) |
1030 | pm_wakeup_event(dev, 0); | |
1031 | ||
e8665002 RW |
1032 | pm_runtime_put_sync(dev); |
1033 | error = pm_wakeup_pending() ? | |
1034 | -EBUSY : device_prepare(dev, state); | |
1eede070 RW |
1035 | |
1036 | mutex_lock(&dpm_list_mtx); | |
1037 | if (error) { | |
1eede070 RW |
1038 | if (error == -EAGAIN) { |
1039 | put_device(dev); | |
886a7a33 | 1040 | error = 0; |
1eede070 RW |
1041 | continue; |
1042 | } | |
1e75227e RW |
1043 | printk(KERN_INFO "PM: Device %s not prepared " |
1044 | "for power transition: code %d\n", | |
5c1a07ab | 1045 | dev_name(dev), error); |
1eede070 RW |
1046 | put_device(dev); |
1047 | break; | |
1048 | } | |
f76b168b | 1049 | dev->power.is_prepared = true; |
1eede070 | 1050 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1051 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
1052 | put_device(dev); |
1053 | } | |
1eede070 | 1054 | mutex_unlock(&dpm_list_mtx); |
cd59abfc AS |
1055 | return error; |
1056 | } | |
1057 | ||
775b64d2 | 1058 | /** |
20d652d7 RW |
1059 | * dpm_suspend_start - Prepare devices for PM transition and suspend them. |
1060 | * @state: PM transition of the system being carried out. | |
775b64d2 | 1061 | * |
20d652d7 RW |
1062 | * Prepare all non-sysdev devices for system PM transition and execute "suspend" |
1063 | * callbacks for them. | |
775b64d2 | 1064 | */ |
d1616302 | 1065 | int dpm_suspend_start(pm_message_t state) |
775b64d2 RW |
1066 | { |
1067 | int error; | |
cd59abfc | 1068 | |
1eede070 RW |
1069 | error = dpm_prepare(state); |
1070 | if (!error) | |
1071 | error = dpm_suspend(state); | |
cd59abfc | 1072 | return error; |
cd59abfc | 1073 | } |
d1616302 | 1074 | EXPORT_SYMBOL_GPL(dpm_suspend_start); |
cd59abfc AS |
1075 | |
1076 | void __suspend_report_result(const char *function, void *fn, int ret) | |
1077 | { | |
c80cfb04 BH |
1078 | if (ret) |
1079 | printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret); | |
cd59abfc AS |
1080 | } |
1081 | EXPORT_SYMBOL_GPL(__suspend_report_result); | |
f8824cee RW |
1082 | |
1083 | /** | |
1084 | * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete. | |
1085 | * @dev: Device to wait for. | |
1086 | * @subordinate: Device that needs to wait for @dev. | |
1087 | */ | |
098dff73 | 1088 | int device_pm_wait_for_dev(struct device *subordinate, struct device *dev) |
f8824cee RW |
1089 | { |
1090 | dpm_wait(dev, subordinate->power.async_suspend); | |
098dff73 | 1091 | return async_error; |
f8824cee RW |
1092 | } |
1093 | EXPORT_SYMBOL_GPL(device_pm_wait_for_dev); |