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