Commit | Line | Data |
---|---|---|
f721889f RW |
1 | /* |
2 | * drivers/base/power/domain.c - Common code related to device power domains. | |
3 | * | |
4 | * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. | |
5 | * | |
6 | * This file is released under the GPLv2. | |
7 | */ | |
8 | ||
93af5e93 | 9 | #include <linux/delay.h> |
f721889f RW |
10 | #include <linux/kernel.h> |
11 | #include <linux/io.h> | |
aa42240a | 12 | #include <linux/platform_device.h> |
f721889f RW |
13 | #include <linux/pm_runtime.h> |
14 | #include <linux/pm_domain.h> | |
6ff7bb0d | 15 | #include <linux/pm_qos.h> |
c11f6f5b | 16 | #include <linux/pm_clock.h> |
f721889f RW |
17 | #include <linux/slab.h> |
18 | #include <linux/err.h> | |
17b75eca RW |
19 | #include <linux/sched.h> |
20 | #include <linux/suspend.h> | |
d5e4cbfe RW |
21 | #include <linux/export.h> |
22 | ||
aa8e54b5 TV |
23 | #include "power.h" |
24 | ||
93af5e93 GU |
25 | #define GENPD_RETRY_MAX_MS 250 /* Approximate */ |
26 | ||
d5e4cbfe RW |
27 | #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \ |
28 | ({ \ | |
29 | type (*__routine)(struct device *__d); \ | |
30 | type __ret = (type)0; \ | |
31 | \ | |
32 | __routine = genpd->dev_ops.callback; \ | |
33 | if (__routine) { \ | |
34 | __ret = __routine(dev); \ | |
d5e4cbfe RW |
35 | } \ |
36 | __ret; \ | |
37 | }) | |
f721889f | 38 | |
5125bbf3 RW |
39 | static LIST_HEAD(gpd_list); |
40 | static DEFINE_MUTEX(gpd_list_lock); | |
41 | ||
446d999c RK |
42 | /* |
43 | * Get the generic PM domain for a particular struct device. | |
44 | * This validates the struct device pointer, the PM domain pointer, | |
45 | * and checks that the PM domain pointer is a real generic PM domain. | |
46 | * Any failure results in NULL being returned. | |
47 | */ | |
48 | struct generic_pm_domain *pm_genpd_lookup_dev(struct device *dev) | |
49 | { | |
50 | struct generic_pm_domain *genpd = NULL, *gpd; | |
51 | ||
52 | if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain)) | |
53 | return NULL; | |
54 | ||
55 | mutex_lock(&gpd_list_lock); | |
56 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
57 | if (&gpd->domain == dev->pm_domain) { | |
58 | genpd = gpd; | |
59 | break; | |
60 | } | |
61 | } | |
62 | mutex_unlock(&gpd_list_lock); | |
63 | ||
64 | return genpd; | |
65 | } | |
66 | ||
67 | /* | |
68 | * This should only be used where we are certain that the pm_domain | |
69 | * attached to the device is a genpd domain. | |
70 | */ | |
71 | static struct generic_pm_domain *dev_to_genpd(struct device *dev) | |
5248051b RW |
72 | { |
73 | if (IS_ERR_OR_NULL(dev->pm_domain)) | |
74 | return ERR_PTR(-EINVAL); | |
75 | ||
596ba34b | 76 | return pd_to_genpd(dev->pm_domain); |
5248051b | 77 | } |
f721889f | 78 | |
2b1d88cd | 79 | static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev) |
d5e4cbfe | 80 | { |
2b1d88cd | 81 | return GENPD_DEV_CALLBACK(genpd, int, stop, dev); |
d5e4cbfe RW |
82 | } |
83 | ||
2b1d88cd | 84 | static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev) |
d5e4cbfe | 85 | { |
2b1d88cd | 86 | return GENPD_DEV_CALLBACK(genpd, int, start, dev); |
d5e4cbfe RW |
87 | } |
88 | ||
c4bb3160 | 89 | static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
f721889f | 90 | { |
c4bb3160 RW |
91 | bool ret = false; |
92 | ||
93 | if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) | |
94 | ret = !!atomic_dec_and_test(&genpd->sd_count); | |
95 | ||
96 | return ret; | |
97 | } | |
98 | ||
99 | static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) | |
100 | { | |
101 | atomic_inc(&genpd->sd_count); | |
4e857c58 | 102 | smp_mb__after_atomic(); |
f721889f RW |
103 | } |
104 | ||
a4630c61 | 105 | static int genpd_power_on(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 | 106 | { |
fc5cbf0c | 107 | unsigned int state_idx = genpd->state_idx; |
c8f0ea45 GU |
108 | ktime_t time_start; |
109 | s64 elapsed_ns; | |
110 | int ret; | |
111 | ||
112 | if (!genpd->power_on) | |
113 | return 0; | |
114 | ||
a4630c61 GU |
115 | if (!timed) |
116 | return genpd->power_on(genpd); | |
117 | ||
c8f0ea45 GU |
118 | time_start = ktime_get(); |
119 | ret = genpd->power_on(genpd); | |
120 | if (ret) | |
121 | return ret; | |
122 | ||
123 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
fc5cbf0c | 124 | if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns) |
c8f0ea45 GU |
125 | return ret; |
126 | ||
fc5cbf0c | 127 | genpd->states[state_idx].power_on_latency_ns = elapsed_ns; |
c8f0ea45 | 128 | genpd->max_off_time_changed = true; |
6d7d5c32 RK |
129 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
130 | genpd->name, "on", elapsed_ns); | |
c8f0ea45 GU |
131 | |
132 | return ret; | |
133 | } | |
134 | ||
a4630c61 | 135 | static int genpd_power_off(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 | 136 | { |
fc5cbf0c | 137 | unsigned int state_idx = genpd->state_idx; |
c8f0ea45 GU |
138 | ktime_t time_start; |
139 | s64 elapsed_ns; | |
140 | int ret; | |
141 | ||
142 | if (!genpd->power_off) | |
143 | return 0; | |
144 | ||
a4630c61 GU |
145 | if (!timed) |
146 | return genpd->power_off(genpd); | |
147 | ||
c8f0ea45 GU |
148 | time_start = ktime_get(); |
149 | ret = genpd->power_off(genpd); | |
150 | if (ret == -EBUSY) | |
151 | return ret; | |
152 | ||
153 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
fc5cbf0c | 154 | if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns) |
c8f0ea45 GU |
155 | return ret; |
156 | ||
fc5cbf0c | 157 | genpd->states[state_idx].power_off_latency_ns = elapsed_ns; |
c8f0ea45 | 158 | genpd->max_off_time_changed = true; |
6d7d5c32 RK |
159 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
160 | genpd->name, "off", elapsed_ns); | |
c8f0ea45 GU |
161 | |
162 | return ret; | |
163 | } | |
164 | ||
29e47e21 | 165 | /** |
7420aa4f | 166 | * genpd_queue_power_off_work - Queue up the execution of genpd_poweroff(). |
a3d09c73 | 167 | * @genpd: PM domain to power off. |
29e47e21 | 168 | * |
7420aa4f | 169 | * Queue up the execution of genpd_poweroff() unless it's already been done |
29e47e21 UH |
170 | * before. |
171 | */ | |
172 | static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) | |
173 | { | |
174 | queue_work(pm_wq, &genpd->power_off_work); | |
175 | } | |
176 | ||
5248051b | 177 | /** |
53af16f7 | 178 | * genpd_poweron - Restore power to a given PM domain and its masters. |
5248051b | 179 | * @genpd: PM domain to power up. |
0106ef51 | 180 | * @depth: nesting count for lockdep. |
5248051b | 181 | * |
5063ce15 | 182 | * Restore power to @genpd and all of its masters so that it is possible to |
5248051b RW |
183 | * resume a device belonging to it. |
184 | */ | |
53af16f7 | 185 | static int genpd_poweron(struct generic_pm_domain *genpd, unsigned int depth) |
5248051b | 186 | { |
5063ce15 | 187 | struct gpd_link *link; |
5248051b RW |
188 | int ret = 0; |
189 | ||
39dd0f23 | 190 | if (genpd->status == GPD_STATE_ACTIVE) |
3f241775 | 191 | return 0; |
5248051b | 192 | |
5063ce15 RW |
193 | /* |
194 | * The list is guaranteed not to change while the loop below is being | |
195 | * executed, unless one of the masters' .power_on() callbacks fiddles | |
196 | * with it. | |
197 | */ | |
198 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
0106ef51 MS |
199 | struct generic_pm_domain *master = link->master; |
200 | ||
201 | genpd_sd_counter_inc(master); | |
202 | ||
203 | mutex_lock_nested(&master->lock, depth + 1); | |
53af16f7 | 204 | ret = genpd_poweron(master, depth + 1); |
0106ef51 | 205 | mutex_unlock(&master->lock); |
5248051b | 206 | |
5063ce15 | 207 | if (ret) { |
0106ef51 | 208 | genpd_sd_counter_dec(master); |
9e08cf42 | 209 | goto err; |
5063ce15 | 210 | } |
5248051b RW |
211 | } |
212 | ||
a4630c61 | 213 | ret = genpd_power_on(genpd, true); |
c8f0ea45 GU |
214 | if (ret) |
215 | goto err; | |
5248051b | 216 | |
ba2bbfbf | 217 | genpd->status = GPD_STATE_ACTIVE; |
3f241775 | 218 | return 0; |
9e08cf42 RW |
219 | |
220 | err: | |
29e47e21 UH |
221 | list_for_each_entry_continue_reverse(link, |
222 | &genpd->slave_links, | |
223 | slave_node) { | |
5063ce15 | 224 | genpd_sd_counter_dec(link->master); |
29e47e21 UH |
225 | genpd_queue_power_off_work(link->master); |
226 | } | |
9e08cf42 | 227 | |
3f241775 RW |
228 | return ret; |
229 | } | |
230 | ||
6ff7bb0d RW |
231 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
232 | unsigned long val, void *ptr) | |
233 | { | |
234 | struct generic_pm_domain_data *gpd_data; | |
235 | struct device *dev; | |
236 | ||
237 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
6ff7bb0d | 238 | dev = gpd_data->base.dev; |
6ff7bb0d RW |
239 | |
240 | for (;;) { | |
241 | struct generic_pm_domain *genpd; | |
242 | struct pm_domain_data *pdd; | |
243 | ||
244 | spin_lock_irq(&dev->power.lock); | |
245 | ||
246 | pdd = dev->power.subsys_data ? | |
247 | dev->power.subsys_data->domain_data : NULL; | |
1d5fcfec | 248 | if (pdd && pdd->dev) { |
6ff7bb0d RW |
249 | to_gpd_data(pdd)->td.constraint_changed = true; |
250 | genpd = dev_to_genpd(dev); | |
251 | } else { | |
252 | genpd = ERR_PTR(-ENODATA); | |
253 | } | |
254 | ||
255 | spin_unlock_irq(&dev->power.lock); | |
256 | ||
257 | if (!IS_ERR(genpd)) { | |
258 | mutex_lock(&genpd->lock); | |
259 | genpd->max_off_time_changed = true; | |
260 | mutex_unlock(&genpd->lock); | |
261 | } | |
262 | ||
263 | dev = dev->parent; | |
264 | if (!dev || dev->power.ignore_children) | |
265 | break; | |
266 | } | |
267 | ||
268 | return NOTIFY_DONE; | |
269 | } | |
270 | ||
f721889f | 271 | /** |
7420aa4f | 272 | * genpd_poweroff - Remove power from a given PM domain. |
f721889f | 273 | * @genpd: PM domain to power down. |
f96b3c4f | 274 | * @is_async: PM domain is powered down from a scheduled work |
f721889f RW |
275 | * |
276 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
ba2bbfbf | 277 | * have been powered down, remove power from @genpd. |
f721889f | 278 | */ |
7420aa4f | 279 | static int genpd_poweroff(struct generic_pm_domain *genpd, bool is_async) |
f721889f | 280 | { |
4605ab65 | 281 | struct pm_domain_data *pdd; |
5063ce15 | 282 | struct gpd_link *link; |
ba2bbfbf | 283 | unsigned int not_suspended = 0; |
f721889f | 284 | |
c6d22b37 RW |
285 | /* |
286 | * Do not try to power off the domain in the following situations: | |
287 | * (1) The domain is already in the "power off" state. | |
ba2bbfbf | 288 | * (2) System suspend is in progress. |
c6d22b37 | 289 | */ |
3f241775 | 290 | if (genpd->status == GPD_STATE_POWER_OFF |
ba2bbfbf | 291 | || genpd->prepared_count > 0) |
f721889f RW |
292 | return 0; |
293 | ||
c4bb3160 | 294 | if (atomic_read(&genpd->sd_count) > 0) |
f721889f RW |
295 | return -EBUSY; |
296 | ||
34b1f762 RW |
297 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { |
298 | enum pm_qos_flags_status stat; | |
299 | ||
300 | stat = dev_pm_qos_flags(pdd->dev, | |
301 | PM_QOS_FLAG_NO_POWER_OFF | |
302 | | PM_QOS_FLAG_REMOTE_WAKEUP); | |
303 | if (stat > PM_QOS_FLAGS_NONE) | |
304 | return -EBUSY; | |
305 | ||
298cd0f0 | 306 | if (!pm_runtime_suspended(pdd->dev) || pdd->dev->power.irq_safe) |
f721889f | 307 | not_suspended++; |
34b1f762 | 308 | } |
f721889f | 309 | |
f96b3c4f | 310 | if (not_suspended > 1 || (not_suspended == 1 && is_async)) |
f721889f RW |
311 | return -EBUSY; |
312 | ||
313 | if (genpd->gov && genpd->gov->power_down_ok) { | |
314 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
315 | return -EAGAIN; | |
316 | } | |
317 | ||
3c07cbc4 | 318 | if (genpd->power_off) { |
ba2bbfbf UH |
319 | int ret; |
320 | ||
321 | if (atomic_read(&genpd->sd_count) > 0) | |
322 | return -EBUSY; | |
17b75eca | 323 | |
3c07cbc4 | 324 | /* |
5063ce15 | 325 | * If sd_count > 0 at this point, one of the subdomains hasn't |
7420aa4f UH |
326 | * managed to call genpd_poweron() for the master yet after |
327 | * incrementing it. In that case genpd_poweron() will wait | |
3c07cbc4 | 328 | * for us to drop the lock, so we can call .power_off() and let |
7420aa4f | 329 | * the genpd_poweron() restore power for us (this shouldn't |
3c07cbc4 RW |
330 | * happen very often). |
331 | */ | |
a4630c61 | 332 | ret = genpd_power_off(genpd, true); |
ba2bbfbf UH |
333 | if (ret) |
334 | return ret; | |
d2805402 | 335 | } |
f721889f | 336 | |
17b75eca | 337 | genpd->status = GPD_STATE_POWER_OFF; |
221e9b58 | 338 | |
5063ce15 RW |
339 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
340 | genpd_sd_counter_dec(link->master); | |
341 | genpd_queue_power_off_work(link->master); | |
342 | } | |
f721889f | 343 | |
ba2bbfbf | 344 | return 0; |
f721889f RW |
345 | } |
346 | ||
347 | /** | |
348 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
349 | * @work: Work structure used for scheduling the execution of this function. | |
350 | */ | |
351 | static void genpd_power_off_work_fn(struct work_struct *work) | |
352 | { | |
353 | struct generic_pm_domain *genpd; | |
354 | ||
355 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
356 | ||
ba2bbfbf | 357 | mutex_lock(&genpd->lock); |
7420aa4f | 358 | genpd_poweroff(genpd, true); |
ba2bbfbf | 359 | mutex_unlock(&genpd->lock); |
f721889f RW |
360 | } |
361 | ||
54eeddbf UH |
362 | /** |
363 | * __genpd_runtime_suspend - walk the hierarchy of ->runtime_suspend() callbacks | |
364 | * @dev: Device to handle. | |
365 | */ | |
366 | static int __genpd_runtime_suspend(struct device *dev) | |
367 | { | |
368 | int (*cb)(struct device *__dev); | |
369 | ||
370 | if (dev->type && dev->type->pm) | |
371 | cb = dev->type->pm->runtime_suspend; | |
372 | else if (dev->class && dev->class->pm) | |
373 | cb = dev->class->pm->runtime_suspend; | |
374 | else if (dev->bus && dev->bus->pm) | |
375 | cb = dev->bus->pm->runtime_suspend; | |
376 | else | |
377 | cb = NULL; | |
378 | ||
379 | if (!cb && dev->driver && dev->driver->pm) | |
380 | cb = dev->driver->pm->runtime_suspend; | |
381 | ||
382 | return cb ? cb(dev) : 0; | |
383 | } | |
384 | ||
385 | /** | |
386 | * __genpd_runtime_resume - walk the hierarchy of ->runtime_resume() callbacks | |
387 | * @dev: Device to handle. | |
388 | */ | |
389 | static int __genpd_runtime_resume(struct device *dev) | |
390 | { | |
391 | int (*cb)(struct device *__dev); | |
392 | ||
393 | if (dev->type && dev->type->pm) | |
394 | cb = dev->type->pm->runtime_resume; | |
395 | else if (dev->class && dev->class->pm) | |
396 | cb = dev->class->pm->runtime_resume; | |
397 | else if (dev->bus && dev->bus->pm) | |
398 | cb = dev->bus->pm->runtime_resume; | |
399 | else | |
400 | cb = NULL; | |
401 | ||
402 | if (!cb && dev->driver && dev->driver->pm) | |
403 | cb = dev->driver->pm->runtime_resume; | |
404 | ||
405 | return cb ? cb(dev) : 0; | |
406 | } | |
407 | ||
f721889f | 408 | /** |
795bd2e7 | 409 | * genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. |
f721889f RW |
410 | * @dev: Device to suspend. |
411 | * | |
412 | * Carry out a runtime suspend of a device under the assumption that its | |
413 | * pm_domain field points to the domain member of an object of type | |
414 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
415 | */ | |
795bd2e7 | 416 | static int genpd_runtime_suspend(struct device *dev) |
f721889f RW |
417 | { |
418 | struct generic_pm_domain *genpd; | |
9df3921e | 419 | bool (*suspend_ok)(struct device *__dev); |
2b1d88cd | 420 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
ffe12855 | 421 | bool runtime_pm = pm_runtime_enabled(dev); |
2b1d88cd UH |
422 | ktime_t time_start; |
423 | s64 elapsed_ns; | |
d5e4cbfe | 424 | int ret; |
f721889f RW |
425 | |
426 | dev_dbg(dev, "%s()\n", __func__); | |
427 | ||
5248051b RW |
428 | genpd = dev_to_genpd(dev); |
429 | if (IS_ERR(genpd)) | |
f721889f RW |
430 | return -EINVAL; |
431 | ||
ffe12855 UH |
432 | /* |
433 | * A runtime PM centric subsystem/driver may re-use the runtime PM | |
434 | * callbacks for other purposes than runtime PM. In those scenarios | |
435 | * runtime PM is disabled. Under these circumstances, we shall skip | |
436 | * validating/measuring the PM QoS latency. | |
437 | */ | |
9df3921e UH |
438 | suspend_ok = genpd->gov ? genpd->gov->suspend_ok : NULL; |
439 | if (runtime_pm && suspend_ok && !suspend_ok(dev)) | |
b02c999a RW |
440 | return -EBUSY; |
441 | ||
2b1d88cd | 442 | /* Measure suspend latency. */ |
ffe12855 UH |
443 | if (runtime_pm) |
444 | time_start = ktime_get(); | |
2b1d88cd | 445 | |
54eeddbf | 446 | ret = __genpd_runtime_suspend(dev); |
d5e4cbfe RW |
447 | if (ret) |
448 | return ret; | |
17b75eca | 449 | |
2b1d88cd | 450 | ret = genpd_stop_dev(genpd, dev); |
ba2bbfbf | 451 | if (ret) { |
54eeddbf | 452 | __genpd_runtime_resume(dev); |
ba2bbfbf UH |
453 | return ret; |
454 | } | |
455 | ||
2b1d88cd | 456 | /* Update suspend latency value if the measured time exceeds it. */ |
ffe12855 UH |
457 | if (runtime_pm) { |
458 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
459 | if (elapsed_ns > td->suspend_latency_ns) { | |
460 | td->suspend_latency_ns = elapsed_ns; | |
461 | dev_dbg(dev, "suspend latency exceeded, %lld ns\n", | |
462 | elapsed_ns); | |
463 | genpd->max_off_time_changed = true; | |
464 | td->constraint_changed = true; | |
465 | } | |
2b1d88cd UH |
466 | } |
467 | ||
0aa2a221 RW |
468 | /* |
469 | * If power.irq_safe is set, this routine will be run with interrupts | |
470 | * off, so it can't use mutexes. | |
471 | */ | |
472 | if (dev->power.irq_safe) | |
473 | return 0; | |
474 | ||
c6d22b37 | 475 | mutex_lock(&genpd->lock); |
7420aa4f | 476 | genpd_poweroff(genpd, false); |
c6d22b37 | 477 | mutex_unlock(&genpd->lock); |
f721889f RW |
478 | |
479 | return 0; | |
480 | } | |
481 | ||
f721889f | 482 | /** |
795bd2e7 | 483 | * genpd_runtime_resume - Resume a device belonging to I/O PM domain. |
f721889f RW |
484 | * @dev: Device to resume. |
485 | * | |
486 | * Carry out a runtime resume of a device under the assumption that its | |
487 | * pm_domain field points to the domain member of an object of type | |
488 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
489 | */ | |
795bd2e7 | 490 | static int genpd_runtime_resume(struct device *dev) |
f721889f RW |
491 | { |
492 | struct generic_pm_domain *genpd; | |
2b1d88cd | 493 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
ffe12855 | 494 | bool runtime_pm = pm_runtime_enabled(dev); |
2b1d88cd UH |
495 | ktime_t time_start; |
496 | s64 elapsed_ns; | |
f721889f | 497 | int ret; |
ba2bbfbf | 498 | bool timed = true; |
f721889f RW |
499 | |
500 | dev_dbg(dev, "%s()\n", __func__); | |
501 | ||
5248051b RW |
502 | genpd = dev_to_genpd(dev); |
503 | if (IS_ERR(genpd)) | |
f721889f RW |
504 | return -EINVAL; |
505 | ||
0aa2a221 | 506 | /* If power.irq_safe, the PM domain is never powered off. */ |
ba2bbfbf UH |
507 | if (dev->power.irq_safe) { |
508 | timed = false; | |
509 | goto out; | |
510 | } | |
0aa2a221 | 511 | |
c6d22b37 | 512 | mutex_lock(&genpd->lock); |
53af16f7 | 513 | ret = genpd_poweron(genpd, 0); |
ba2bbfbf | 514 | mutex_unlock(&genpd->lock); |
c6d22b37 | 515 | |
ba2bbfbf UH |
516 | if (ret) |
517 | return ret; | |
c6d22b37 | 518 | |
ba2bbfbf | 519 | out: |
2b1d88cd | 520 | /* Measure resume latency. */ |
ffe12855 | 521 | if (timed && runtime_pm) |
2b1d88cd UH |
522 | time_start = ktime_get(); |
523 | ||
076395ca LP |
524 | ret = genpd_start_dev(genpd, dev); |
525 | if (ret) | |
526 | goto err_poweroff; | |
527 | ||
54eeddbf | 528 | ret = __genpd_runtime_resume(dev); |
076395ca LP |
529 | if (ret) |
530 | goto err_stop; | |
2b1d88cd UH |
531 | |
532 | /* Update resume latency value if the measured time exceeds it. */ | |
ffe12855 | 533 | if (timed && runtime_pm) { |
2b1d88cd UH |
534 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
535 | if (elapsed_ns > td->resume_latency_ns) { | |
536 | td->resume_latency_ns = elapsed_ns; | |
537 | dev_dbg(dev, "resume latency exceeded, %lld ns\n", | |
538 | elapsed_ns); | |
539 | genpd->max_off_time_changed = true; | |
540 | td->constraint_changed = true; | |
541 | } | |
542 | } | |
17b75eca | 543 | |
f721889f | 544 | return 0; |
076395ca LP |
545 | |
546 | err_stop: | |
547 | genpd_stop_dev(genpd, dev); | |
548 | err_poweroff: | |
549 | if (!dev->power.irq_safe) { | |
550 | mutex_lock(&genpd->lock); | |
551 | genpd_poweroff(genpd, 0); | |
552 | mutex_unlock(&genpd->lock); | |
553 | } | |
554 | ||
555 | return ret; | |
f721889f RW |
556 | } |
557 | ||
39ac5ba5 TB |
558 | static bool pd_ignore_unused; |
559 | static int __init pd_ignore_unused_setup(char *__unused) | |
560 | { | |
561 | pd_ignore_unused = true; | |
562 | return 1; | |
563 | } | |
564 | __setup("pd_ignore_unused", pd_ignore_unused_setup); | |
565 | ||
17f2ae7f | 566 | /** |
bb4b72fc | 567 | * genpd_poweroff_unused - Power off all PM domains with no devices in use. |
17f2ae7f | 568 | */ |
bb4b72fc | 569 | static int __init genpd_poweroff_unused(void) |
17f2ae7f RW |
570 | { |
571 | struct generic_pm_domain *genpd; | |
572 | ||
39ac5ba5 TB |
573 | if (pd_ignore_unused) { |
574 | pr_warn("genpd: Not disabling unused power domains\n"); | |
bb4b72fc | 575 | return 0; |
39ac5ba5 TB |
576 | } |
577 | ||
17f2ae7f RW |
578 | mutex_lock(&gpd_list_lock); |
579 | ||
580 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
581 | genpd_queue_power_off_work(genpd); | |
582 | ||
583 | mutex_unlock(&gpd_list_lock); | |
17f2ae7f | 584 | |
2fe71dcd UH |
585 | return 0; |
586 | } | |
587 | late_initcall(genpd_poweroff_unused); | |
588 | ||
596ba34b RW |
589 | #ifdef CONFIG_PM_SLEEP |
590 | ||
77f827de RW |
591 | /** |
592 | * pm_genpd_present - Check if the given PM domain has been initialized. | |
593 | * @genpd: PM domain to check. | |
594 | */ | |
895b31f3 | 595 | static bool pm_genpd_present(const struct generic_pm_domain *genpd) |
77f827de | 596 | { |
895b31f3 | 597 | const struct generic_pm_domain *gpd; |
77f827de RW |
598 | |
599 | if (IS_ERR_OR_NULL(genpd)) | |
600 | return false; | |
601 | ||
602 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
603 | if (gpd == genpd) | |
604 | return true; | |
605 | ||
606 | return false; | |
607 | } | |
608 | ||
d5e4cbfe RW |
609 | static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd, |
610 | struct device *dev) | |
611 | { | |
612 | return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev); | |
613 | } | |
614 | ||
596ba34b | 615 | /** |
5063ce15 | 616 | * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters. |
596ba34b | 617 | * @genpd: PM domain to power off, if possible. |
a4630c61 | 618 | * @timed: True if latency measurements are allowed. |
596ba34b RW |
619 | * |
620 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 621 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b | 622 | * |
77f827de RW |
623 | * This function is only called in "noirq" and "syscore" stages of system power |
624 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
625 | * executed sequentially, so it is guaranteed that it will never run twice in | |
626 | * parallel). | |
596ba34b | 627 | */ |
a4630c61 GU |
628 | static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd, |
629 | bool timed) | |
596ba34b | 630 | { |
5063ce15 | 631 | struct gpd_link *link; |
596ba34b | 632 | |
17b75eca | 633 | if (genpd->status == GPD_STATE_POWER_OFF) |
596ba34b RW |
634 | return; |
635 | ||
c4bb3160 RW |
636 | if (genpd->suspended_count != genpd->device_count |
637 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
638 | return; |
639 | ||
fc5cbf0c AH |
640 | /* Choose the deepest state when suspending */ |
641 | genpd->state_idx = genpd->state_count - 1; | |
a4630c61 | 642 | genpd_power_off(genpd, timed); |
596ba34b | 643 | |
17b75eca | 644 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
645 | |
646 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
647 | genpd_sd_counter_dec(link->master); | |
a4630c61 | 648 | pm_genpd_sync_poweroff(link->master, timed); |
596ba34b RW |
649 | } |
650 | } | |
651 | ||
802d8b49 RW |
652 | /** |
653 | * pm_genpd_sync_poweron - Synchronously power on a PM domain and its masters. | |
654 | * @genpd: PM domain to power on. | |
a4630c61 | 655 | * @timed: True if latency measurements are allowed. |
802d8b49 | 656 | * |
77f827de RW |
657 | * This function is only called in "noirq" and "syscore" stages of system power |
658 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
659 | * executed sequentially, so it is guaranteed that it will never run twice in | |
660 | * parallel). | |
802d8b49 | 661 | */ |
a4630c61 GU |
662 | static void pm_genpd_sync_poweron(struct generic_pm_domain *genpd, |
663 | bool timed) | |
802d8b49 RW |
664 | { |
665 | struct gpd_link *link; | |
666 | ||
ba2bbfbf | 667 | if (genpd->status == GPD_STATE_ACTIVE) |
802d8b49 RW |
668 | return; |
669 | ||
670 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
a4630c61 | 671 | pm_genpd_sync_poweron(link->master, timed); |
802d8b49 RW |
672 | genpd_sd_counter_inc(link->master); |
673 | } | |
674 | ||
a4630c61 | 675 | genpd_power_on(genpd, timed); |
802d8b49 RW |
676 | |
677 | genpd->status = GPD_STATE_ACTIVE; | |
678 | } | |
679 | ||
4ecd6e65 RW |
680 | /** |
681 | * resume_needed - Check whether to resume a device before system suspend. | |
682 | * @dev: Device to check. | |
683 | * @genpd: PM domain the device belongs to. | |
684 | * | |
685 | * There are two cases in which a device that can wake up the system from sleep | |
686 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled | |
687 | * to wake up the system and it has to remain active for this purpose while the | |
688 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
689 | * the system from sleep states and it generally doesn't generate wakeup signals | |
690 | * by itself (those signals are generated on its behalf by other parts of the | |
691 | * system). In the latter case it may be necessary to reconfigure the device's | |
692 | * wakeup settings during system suspend, because it may have been set up to | |
693 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
694 | * Return 'true' in either of the above cases. | |
695 | */ | |
696 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) | |
697 | { | |
698 | bool active_wakeup; | |
699 | ||
700 | if (!device_can_wakeup(dev)) | |
701 | return false; | |
702 | ||
d5e4cbfe | 703 | active_wakeup = genpd_dev_active_wakeup(genpd, dev); |
4ecd6e65 RW |
704 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
705 | } | |
706 | ||
596ba34b RW |
707 | /** |
708 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
709 | * @dev: Device to start the transition of. | |
710 | * | |
711 | * Start a power transition of a device (during a system-wide power transition) | |
712 | * under the assumption that its pm_domain field points to the domain member of | |
713 | * an object of type struct generic_pm_domain representing a PM domain | |
714 | * consisting of I/O devices. | |
715 | */ | |
716 | static int pm_genpd_prepare(struct device *dev) | |
717 | { | |
718 | struct generic_pm_domain *genpd; | |
b6c10c84 | 719 | int ret; |
596ba34b RW |
720 | |
721 | dev_dbg(dev, "%s()\n", __func__); | |
722 | ||
723 | genpd = dev_to_genpd(dev); | |
724 | if (IS_ERR(genpd)) | |
725 | return -EINVAL; | |
726 | ||
17b75eca RW |
727 | /* |
728 | * If a wakeup request is pending for the device, it should be woken up | |
729 | * at this point and a system wakeup event should be reported if it's | |
730 | * set up to wake up the system from sleep states. | |
731 | */ | |
4ecd6e65 RW |
732 | if (resume_needed(dev, genpd)) |
733 | pm_runtime_resume(dev); | |
734 | ||
ba2bbfbf | 735 | mutex_lock(&genpd->lock); |
596ba34b | 736 | |
39dd0f23 | 737 | if (genpd->prepared_count++ == 0) |
65533bbf | 738 | genpd->suspended_count = 0; |
17b75eca | 739 | |
ba2bbfbf | 740 | mutex_unlock(&genpd->lock); |
596ba34b | 741 | |
596ba34b | 742 | /* |
39dd0f23 UH |
743 | * Even if the PM domain is powered off at this point, we can't expect |
744 | * it to remain in that state during the entire system PM suspend | |
745 | * phase. Any subsystem/driver for a device in the PM domain, may still | |
746 | * need to serve a request which may require the device to be runtime | |
747 | * resumed and its PM domain to be powered. | |
748 | * | |
749 | * As we are disabling runtime PM at this point, we are preventing the | |
750 | * subsystem/driver to decide themselves. For that reason, we need to | |
751 | * make sure the device is operational as it may be required in some | |
752 | * cases. | |
596ba34b | 753 | */ |
17b75eca | 754 | pm_runtime_resume(dev); |
596ba34b RW |
755 | __pm_runtime_disable(dev, false); |
756 | ||
b6c10c84 RW |
757 | ret = pm_generic_prepare(dev); |
758 | if (ret) { | |
759 | mutex_lock(&genpd->lock); | |
760 | ||
39dd0f23 | 761 | genpd->prepared_count--; |
b6c10c84 RW |
762 | |
763 | mutex_unlock(&genpd->lock); | |
17b75eca | 764 | pm_runtime_enable(dev); |
b6c10c84 | 765 | } |
17b75eca | 766 | |
b6c10c84 | 767 | return ret; |
596ba34b RW |
768 | } |
769 | ||
0496c8ae RW |
770 | /** |
771 | * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. | |
772 | * @dev: Device to suspend. | |
773 | * | |
774 | * Stop the device and remove power from the domain if all devices in it have | |
775 | * been stopped. | |
776 | */ | |
777 | static int pm_genpd_suspend_noirq(struct device *dev) | |
778 | { | |
779 | struct generic_pm_domain *genpd; | |
780 | ||
781 | dev_dbg(dev, "%s()\n", __func__); | |
782 | ||
783 | genpd = dev_to_genpd(dev); | |
784 | if (IS_ERR(genpd)) | |
785 | return -EINVAL; | |
596ba34b | 786 | |
39dd0f23 | 787 | if (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)) |
d4f2d87a RW |
788 | return 0; |
789 | ||
2b1d88cd | 790 | genpd_stop_dev(genpd, dev); |
596ba34b RW |
791 | |
792 | /* | |
793 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
794 | * guaranteed that this function will never run twice in parallel for | |
795 | * the same PM domain, so it is not necessary to use locking here. | |
796 | */ | |
797 | genpd->suspended_count++; | |
a4630c61 | 798 | pm_genpd_sync_poweroff(genpd, true); |
596ba34b RW |
799 | |
800 | return 0; | |
801 | } | |
802 | ||
803 | /** | |
0496c8ae | 804 | * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
805 | * @dev: Device to resume. |
806 | * | |
0496c8ae | 807 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b RW |
808 | */ |
809 | static int pm_genpd_resume_noirq(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 | ||
39dd0f23 | 819 | if (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)) |
596ba34b RW |
820 | return 0; |
821 | ||
822 | /* | |
823 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
824 | * guaranteed that this function will never run twice in parallel for | |
825 | * the same PM domain, so it is not necessary to use locking here. | |
826 | */ | |
a4630c61 | 827 | pm_genpd_sync_poweron(genpd, true); |
596ba34b | 828 | genpd->suspended_count--; |
596ba34b | 829 | |
2b1d88cd | 830 | return genpd_start_dev(genpd, dev); |
596ba34b RW |
831 | } |
832 | ||
0496c8ae RW |
833 | /** |
834 | * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. | |
596ba34b RW |
835 | * @dev: Device to freeze. |
836 | * | |
837 | * Carry out a late freeze of a device under the assumption that its | |
838 | * pm_domain field points to the domain member of an object of type | |
839 | * struct generic_pm_domain representing a power domain consisting of I/O | |
840 | * devices. | |
841 | */ | |
842 | static int pm_genpd_freeze_noirq(struct device *dev) | |
843 | { | |
844 | struct generic_pm_domain *genpd; | |
596ba34b RW |
845 | |
846 | dev_dbg(dev, "%s()\n", __func__); | |
847 | ||
848 | genpd = dev_to_genpd(dev); | |
849 | if (IS_ERR(genpd)) | |
850 | return -EINVAL; | |
851 | ||
39dd0f23 | 852 | return genpd_stop_dev(genpd, dev); |
0496c8ae | 853 | } |
596ba34b | 854 | |
0496c8ae RW |
855 | /** |
856 | * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain. | |
857 | * @dev: Device to thaw. | |
858 | * | |
859 | * Start the device, unless power has been removed from the domain already | |
860 | * before the system transition. | |
861 | */ | |
862 | static int pm_genpd_thaw_noirq(struct device *dev) | |
863 | { | |
864 | struct generic_pm_domain *genpd; | |
596ba34b | 865 | |
0496c8ae | 866 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 867 | |
0496c8ae RW |
868 | genpd = dev_to_genpd(dev); |
869 | if (IS_ERR(genpd)) | |
870 | return -EINVAL; | |
871 | ||
39dd0f23 | 872 | return genpd_start_dev(genpd, dev); |
596ba34b RW |
873 | } |
874 | ||
596ba34b | 875 | /** |
0496c8ae | 876 | * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
877 | * @dev: Device to resume. |
878 | * | |
0496c8ae RW |
879 | * Make sure the domain will be in the same power state as before the |
880 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b RW |
881 | */ |
882 | static int pm_genpd_restore_noirq(struct device *dev) | |
883 | { | |
884 | struct generic_pm_domain *genpd; | |
885 | ||
886 | dev_dbg(dev, "%s()\n", __func__); | |
887 | ||
888 | genpd = dev_to_genpd(dev); | |
889 | if (IS_ERR(genpd)) | |
890 | return -EINVAL; | |
891 | ||
892 | /* | |
893 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
894 | * guaranteed that this function will never run twice in parallel for | |
895 | * the same PM domain, so it is not necessary to use locking here. | |
65533bbf RW |
896 | * |
897 | * At this point suspended_count == 0 means we are being run for the | |
898 | * first time for the given domain in the present cycle. | |
596ba34b | 899 | */ |
39dd0f23 | 900 | if (genpd->suspended_count++ == 0) |
596ba34b | 901 | /* |
65533bbf | 902 | * The boot kernel might put the domain into arbitrary state, |
802d8b49 RW |
903 | * so make it appear as powered off to pm_genpd_sync_poweron(), |
904 | * so that it tries to power it on in case it was really off. | |
596ba34b | 905 | */ |
65533bbf | 906 | genpd->status = GPD_STATE_POWER_OFF; |
18dd2ece | 907 | |
a4630c61 | 908 | pm_genpd_sync_poweron(genpd, true); |
596ba34b | 909 | |
2b1d88cd | 910 | return genpd_start_dev(genpd, dev); |
596ba34b RW |
911 | } |
912 | ||
913 | /** | |
914 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
915 | * @dev: Device to complete the transition of. | |
916 | * | |
917 | * Complete a power transition of a device (during a system-wide power | |
918 | * transition) under the assumption that its pm_domain field points to the | |
919 | * domain member of an object of type struct generic_pm_domain representing | |
920 | * a power domain consisting of I/O devices. | |
921 | */ | |
922 | static void pm_genpd_complete(struct device *dev) | |
923 | { | |
924 | struct generic_pm_domain *genpd; | |
596ba34b RW |
925 | |
926 | dev_dbg(dev, "%s()\n", __func__); | |
927 | ||
928 | genpd = dev_to_genpd(dev); | |
929 | if (IS_ERR(genpd)) | |
930 | return; | |
931 | ||
932 | mutex_lock(&genpd->lock); | |
933 | ||
39dd0f23 | 934 | genpd->prepared_count--; |
596ba34b RW |
935 | |
936 | mutex_unlock(&genpd->lock); | |
937 | ||
39dd0f23 UH |
938 | pm_generic_complete(dev); |
939 | pm_runtime_set_active(dev); | |
940 | pm_runtime_enable(dev); | |
941 | pm_request_idle(dev); | |
596ba34b RW |
942 | } |
943 | ||
77f827de | 944 | /** |
d47e6464 | 945 | * genpd_syscore_switch - Switch power during system core suspend or resume. |
77f827de RW |
946 | * @dev: Device that normally is marked as "always on" to switch power for. |
947 | * | |
948 | * This routine may only be called during the system core (syscore) suspend or | |
949 | * resume phase for devices whose "always on" flags are set. | |
950 | */ | |
d47e6464 | 951 | static void genpd_syscore_switch(struct device *dev, bool suspend) |
77f827de RW |
952 | { |
953 | struct generic_pm_domain *genpd; | |
954 | ||
955 | genpd = dev_to_genpd(dev); | |
956 | if (!pm_genpd_present(genpd)) | |
957 | return; | |
958 | ||
959 | if (suspend) { | |
960 | genpd->suspended_count++; | |
a4630c61 | 961 | pm_genpd_sync_poweroff(genpd, false); |
77f827de | 962 | } else { |
a4630c61 | 963 | pm_genpd_sync_poweron(genpd, false); |
77f827de RW |
964 | genpd->suspended_count--; |
965 | } | |
966 | } | |
d47e6464 UH |
967 | |
968 | void pm_genpd_syscore_poweroff(struct device *dev) | |
969 | { | |
970 | genpd_syscore_switch(dev, true); | |
971 | } | |
972 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff); | |
973 | ||
974 | void pm_genpd_syscore_poweron(struct device *dev) | |
975 | { | |
976 | genpd_syscore_switch(dev, false); | |
977 | } | |
978 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron); | |
77f827de | 979 | |
d30d819d | 980 | #else /* !CONFIG_PM_SLEEP */ |
596ba34b RW |
981 | |
982 | #define pm_genpd_prepare NULL | |
596ba34b RW |
983 | #define pm_genpd_suspend_noirq NULL |
984 | #define pm_genpd_resume_noirq NULL | |
596ba34b RW |
985 | #define pm_genpd_freeze_noirq NULL |
986 | #define pm_genpd_thaw_noirq NULL | |
596ba34b | 987 | #define pm_genpd_restore_noirq NULL |
596ba34b RW |
988 | #define pm_genpd_complete NULL |
989 | ||
990 | #endif /* CONFIG_PM_SLEEP */ | |
991 | ||
f104e1e5 UH |
992 | static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev, |
993 | struct generic_pm_domain *genpd, | |
994 | struct gpd_timing_data *td) | |
1d5fcfec RW |
995 | { |
996 | struct generic_pm_domain_data *gpd_data; | |
3e235685 UH |
997 | int ret; |
998 | ||
999 | ret = dev_pm_get_subsys_data(dev); | |
1000 | if (ret) | |
1001 | return ERR_PTR(ret); | |
1d5fcfec RW |
1002 | |
1003 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); | |
3e235685 UH |
1004 | if (!gpd_data) { |
1005 | ret = -ENOMEM; | |
1006 | goto err_put; | |
1007 | } | |
1d5fcfec | 1008 | |
f104e1e5 UH |
1009 | if (td) |
1010 | gpd_data->td = *td; | |
1011 | ||
1012 | gpd_data->base.dev = dev; | |
f104e1e5 UH |
1013 | gpd_data->td.constraint_changed = true; |
1014 | gpd_data->td.effective_constraint_ns = -1; | |
1015 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; | |
1016 | ||
1017 | spin_lock_irq(&dev->power.lock); | |
1018 | ||
1019 | if (dev->power.subsys_data->domain_data) { | |
1020 | ret = -EINVAL; | |
1021 | goto err_free; | |
1022 | } | |
1023 | ||
1024 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
f104e1e5 UH |
1025 | |
1026 | spin_unlock_irq(&dev->power.lock); | |
1027 | ||
989561de TV |
1028 | dev_pm_domain_set(dev, &genpd->domain); |
1029 | ||
1d5fcfec | 1030 | return gpd_data; |
3e235685 | 1031 | |
f104e1e5 UH |
1032 | err_free: |
1033 | spin_unlock_irq(&dev->power.lock); | |
1034 | kfree(gpd_data); | |
3e235685 UH |
1035 | err_put: |
1036 | dev_pm_put_subsys_data(dev); | |
1037 | return ERR_PTR(ret); | |
1d5fcfec RW |
1038 | } |
1039 | ||
49d400c7 UH |
1040 | static void genpd_free_dev_data(struct device *dev, |
1041 | struct generic_pm_domain_data *gpd_data) | |
1d5fcfec | 1042 | { |
989561de TV |
1043 | dev_pm_domain_set(dev, NULL); |
1044 | ||
f104e1e5 UH |
1045 | spin_lock_irq(&dev->power.lock); |
1046 | ||
f104e1e5 UH |
1047 | dev->power.subsys_data->domain_data = NULL; |
1048 | ||
1049 | spin_unlock_irq(&dev->power.lock); | |
1050 | ||
1d5fcfec | 1051 | kfree(gpd_data); |
3e235685 | 1052 | dev_pm_put_subsys_data(dev); |
1d5fcfec RW |
1053 | } |
1054 | ||
f721889f | 1055 | /** |
b02c999a | 1056 | * __pm_genpd_add_device - Add a device to an I/O PM domain. |
f721889f RW |
1057 | * @genpd: PM domain to add the device to. |
1058 | * @dev: Device to be added. | |
b02c999a | 1059 | * @td: Set of PM QoS timing parameters to attach to the device. |
f721889f | 1060 | */ |
b02c999a RW |
1061 | int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1062 | struct gpd_timing_data *td) | |
f721889f | 1063 | { |
c0356db7 | 1064 | struct generic_pm_domain_data *gpd_data; |
f721889f RW |
1065 | int ret = 0; |
1066 | ||
1067 | dev_dbg(dev, "%s()\n", __func__); | |
1068 | ||
1069 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1070 | return -EINVAL; | |
1071 | ||
f104e1e5 | 1072 | gpd_data = genpd_alloc_dev_data(dev, genpd, td); |
3e235685 UH |
1073 | if (IS_ERR(gpd_data)) |
1074 | return PTR_ERR(gpd_data); | |
6ff7bb0d | 1075 | |
ba2bbfbf | 1076 | mutex_lock(&genpd->lock); |
f721889f | 1077 | |
596ba34b RW |
1078 | if (genpd->prepared_count > 0) { |
1079 | ret = -EAGAIN; | |
1080 | goto out; | |
1081 | } | |
1082 | ||
b472c2fa UH |
1083 | ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0; |
1084 | if (ret) | |
1085 | goto out; | |
d79b6fe1 | 1086 | |
14b53064 UH |
1087 | genpd->device_count++; |
1088 | genpd->max_off_time_changed = true; | |
1089 | ||
1d5fcfec | 1090 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
6ff7bb0d | 1091 | |
f721889f | 1092 | out: |
ba2bbfbf | 1093 | mutex_unlock(&genpd->lock); |
f721889f | 1094 | |
c0356db7 UH |
1095 | if (ret) |
1096 | genpd_free_dev_data(dev, gpd_data); | |
1097 | else | |
1098 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); | |
1d5fcfec | 1099 | |
f721889f RW |
1100 | return ret; |
1101 | } | |
24c96dc7 | 1102 | EXPORT_SYMBOL_GPL(__pm_genpd_add_device); |
f721889f RW |
1103 | |
1104 | /** | |
1105 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1106 | * @genpd: PM domain to remove the device from. | |
1107 | * @dev: Device to be removed. | |
1108 | */ | |
1109 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1110 | struct device *dev) | |
1111 | { | |
6ff7bb0d | 1112 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1113 | struct pm_domain_data *pdd; |
efa69025 | 1114 | int ret = 0; |
f721889f RW |
1115 | |
1116 | dev_dbg(dev, "%s()\n", __func__); | |
1117 | ||
df6a0d6f | 1118 | if (!genpd || genpd != pm_genpd_lookup_dev(dev)) |
f721889f RW |
1119 | return -EINVAL; |
1120 | ||
c0356db7 UH |
1121 | /* The above validation also means we have existing domain_data. */ |
1122 | pdd = dev->power.subsys_data->domain_data; | |
1123 | gpd_data = to_gpd_data(pdd); | |
1124 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb); | |
1125 | ||
ba2bbfbf | 1126 | mutex_lock(&genpd->lock); |
f721889f | 1127 | |
596ba34b RW |
1128 | if (genpd->prepared_count > 0) { |
1129 | ret = -EAGAIN; | |
1130 | goto out; | |
1131 | } | |
1132 | ||
6ff7bb0d RW |
1133 | genpd->device_count--; |
1134 | genpd->max_off_time_changed = true; | |
1135 | ||
d79b6fe1 | 1136 | if (genpd->detach_dev) |
c16561e8 | 1137 | genpd->detach_dev(genpd, dev); |
d79b6fe1 | 1138 | |
efa69025 | 1139 | list_del_init(&pdd->list_node); |
6ff7bb0d | 1140 | |
ba2bbfbf | 1141 | mutex_unlock(&genpd->lock); |
6ff7bb0d | 1142 | |
c1dbe2fb | 1143 | genpd_free_dev_data(dev, gpd_data); |
1d5fcfec | 1144 | |
6ff7bb0d | 1145 | return 0; |
f721889f | 1146 | |
596ba34b | 1147 | out: |
ba2bbfbf | 1148 | mutex_unlock(&genpd->lock); |
c0356db7 | 1149 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); |
f721889f RW |
1150 | |
1151 | return ret; | |
1152 | } | |
24c96dc7 | 1153 | EXPORT_SYMBOL_GPL(pm_genpd_remove_device); |
f721889f RW |
1154 | |
1155 | /** | |
1156 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1157 | * @genpd: Master PM domain to add the subdomain to. | |
bc0403ff | 1158 | * @subdomain: Subdomain to be added. |
f721889f RW |
1159 | */ |
1160 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
bc0403ff | 1161 | struct generic_pm_domain *subdomain) |
f721889f | 1162 | { |
2547923d | 1163 | struct gpd_link *link, *itr; |
f721889f RW |
1164 | int ret = 0; |
1165 | ||
fb7268be RW |
1166 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
1167 | || genpd == subdomain) | |
f721889f RW |
1168 | return -EINVAL; |
1169 | ||
2547923d LI |
1170 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1171 | if (!link) | |
1172 | return -ENOMEM; | |
1173 | ||
cdb300a0 UH |
1174 | mutex_lock(&subdomain->lock); |
1175 | mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING); | |
f721889f | 1176 | |
17b75eca | 1177 | if (genpd->status == GPD_STATE_POWER_OFF |
bc0403ff | 1178 | && subdomain->status != GPD_STATE_POWER_OFF) { |
f721889f RW |
1179 | ret = -EINVAL; |
1180 | goto out; | |
1181 | } | |
1182 | ||
2547923d LI |
1183 | list_for_each_entry(itr, &genpd->master_links, master_node) { |
1184 | if (itr->slave == subdomain && itr->master == genpd) { | |
f721889f RW |
1185 | ret = -EINVAL; |
1186 | goto out; | |
1187 | } | |
1188 | } | |
1189 | ||
5063ce15 RW |
1190 | link->master = genpd; |
1191 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1192 | link->slave = subdomain; |
1193 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
1194 | if (subdomain->status != GPD_STATE_POWER_OFF) | |
c4bb3160 | 1195 | genpd_sd_counter_inc(genpd); |
f721889f | 1196 | |
f721889f | 1197 | out: |
ba2bbfbf | 1198 | mutex_unlock(&genpd->lock); |
cdb300a0 | 1199 | mutex_unlock(&subdomain->lock); |
2547923d LI |
1200 | if (ret) |
1201 | kfree(link); | |
f721889f RW |
1202 | return ret; |
1203 | } | |
d60ee966 | 1204 | EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain); |
f721889f RW |
1205 | |
1206 | /** | |
1207 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1208 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1209 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1210 | */ |
1211 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1212 | struct generic_pm_domain *subdomain) |
f721889f | 1213 | { |
5063ce15 | 1214 | struct gpd_link *link; |
f721889f RW |
1215 | int ret = -EINVAL; |
1216 | ||
5063ce15 | 1217 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1218 | return -EINVAL; |
1219 | ||
cdb300a0 UH |
1220 | mutex_lock(&subdomain->lock); |
1221 | mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING); | |
f721889f | 1222 | |
beda5fc1 | 1223 | if (!list_empty(&subdomain->master_links) || subdomain->device_count) { |
30e7a65b JH |
1224 | pr_warn("%s: unable to remove subdomain %s\n", genpd->name, |
1225 | subdomain->name); | |
1226 | ret = -EBUSY; | |
1227 | goto out; | |
1228 | } | |
1229 | ||
5063ce15 RW |
1230 | list_for_each_entry(link, &genpd->master_links, master_node) { |
1231 | if (link->slave != subdomain) | |
f721889f RW |
1232 | continue; |
1233 | ||
5063ce15 RW |
1234 | list_del(&link->master_node); |
1235 | list_del(&link->slave_node); | |
1236 | kfree(link); | |
17b75eca | 1237 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1238 | genpd_sd_counter_dec(genpd); |
1239 | ||
f721889f RW |
1240 | ret = 0; |
1241 | break; | |
1242 | } | |
1243 | ||
30e7a65b | 1244 | out: |
ba2bbfbf | 1245 | mutex_unlock(&genpd->lock); |
cdb300a0 | 1246 | mutex_unlock(&subdomain->lock); |
f721889f RW |
1247 | |
1248 | return ret; | |
1249 | } | |
d60ee966 | 1250 | EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain); |
f721889f RW |
1251 | |
1252 | /** | |
1253 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1254 | * @genpd: PM domain object to initialize. | |
1255 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1256 | * @is_off: Initial value of the domain's power_is_off field. | |
1257 | */ | |
1258 | void pm_genpd_init(struct generic_pm_domain *genpd, | |
1259 | struct dev_power_governor *gov, bool is_off) | |
1260 | { | |
1261 | if (IS_ERR_OR_NULL(genpd)) | |
1262 | return; | |
1263 | ||
5063ce15 RW |
1264 | INIT_LIST_HEAD(&genpd->master_links); |
1265 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1266 | INIT_LIST_HEAD(&genpd->dev_list); |
f721889f RW |
1267 | mutex_init(&genpd->lock); |
1268 | genpd->gov = gov; | |
1269 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
c4bb3160 | 1270 | atomic_set(&genpd->sd_count, 0); |
17b75eca | 1271 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
596ba34b | 1272 | genpd->device_count = 0; |
221e9b58 | 1273 | genpd->max_off_time_ns = -1; |
6ff7bb0d | 1274 | genpd->max_off_time_changed = true; |
795bd2e7 UH |
1275 | genpd->domain.ops.runtime_suspend = genpd_runtime_suspend; |
1276 | genpd->domain.ops.runtime_resume = genpd_runtime_resume; | |
596ba34b | 1277 | genpd->domain.ops.prepare = pm_genpd_prepare; |
80018853 UH |
1278 | genpd->domain.ops.suspend = pm_generic_suspend; |
1279 | genpd->domain.ops.suspend_late = pm_generic_suspend_late; | |
596ba34b RW |
1280 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; |
1281 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; | |
80018853 UH |
1282 | genpd->domain.ops.resume_early = pm_generic_resume_early; |
1283 | genpd->domain.ops.resume = pm_generic_resume; | |
1284 | genpd->domain.ops.freeze = pm_generic_freeze; | |
1285 | genpd->domain.ops.freeze_late = pm_generic_freeze_late; | |
596ba34b RW |
1286 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; |
1287 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; | |
80018853 UH |
1288 | genpd->domain.ops.thaw_early = pm_generic_thaw_early; |
1289 | genpd->domain.ops.thaw = pm_generic_thaw; | |
1290 | genpd->domain.ops.poweroff = pm_generic_poweroff; | |
1291 | genpd->domain.ops.poweroff_late = pm_generic_poweroff_late; | |
d23b9b00 | 1292 | genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq; |
596ba34b | 1293 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; |
80018853 UH |
1294 | genpd->domain.ops.restore_early = pm_generic_restore_early; |
1295 | genpd->domain.ops.restore = pm_generic_restore; | |
596ba34b | 1296 | genpd->domain.ops.complete = pm_genpd_complete; |
c11f6f5b UH |
1297 | |
1298 | if (genpd->flags & GENPD_FLAG_PM_CLK) { | |
1299 | genpd->dev_ops.stop = pm_clk_suspend; | |
1300 | genpd->dev_ops.start = pm_clk_resume; | |
1301 | } | |
1302 | ||
fc5cbf0c AH |
1303 | if (genpd->state_idx >= GENPD_MAX_NUM_STATES) { |
1304 | pr_warn("Initial state index out of bounds.\n"); | |
1305 | genpd->state_idx = GENPD_MAX_NUM_STATES - 1; | |
1306 | } | |
1307 | ||
1308 | if (genpd->state_count > GENPD_MAX_NUM_STATES) { | |
1309 | pr_warn("Limiting states to %d\n", GENPD_MAX_NUM_STATES); | |
1310 | genpd->state_count = GENPD_MAX_NUM_STATES; | |
1311 | } | |
1312 | ||
1313 | /* Use only one "off" state if there were no states declared */ | |
90e63452 | 1314 | if (genpd->state_count == 0) |
fc5cbf0c | 1315 | genpd->state_count = 1; |
fc5cbf0c | 1316 | |
5125bbf3 RW |
1317 | mutex_lock(&gpd_list_lock); |
1318 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1319 | mutex_unlock(&gpd_list_lock); | |
1320 | } | |
be5ed55d | 1321 | EXPORT_SYMBOL_GPL(pm_genpd_init); |
aa42240a TF |
1322 | |
1323 | #ifdef CONFIG_PM_GENERIC_DOMAINS_OF | |
1324 | /* | |
1325 | * Device Tree based PM domain providers. | |
1326 | * | |
1327 | * The code below implements generic device tree based PM domain providers that | |
1328 | * bind device tree nodes with generic PM domains registered in the system. | |
1329 | * | |
1330 | * Any driver that registers generic PM domains and needs to support binding of | |
1331 | * devices to these domains is supposed to register a PM domain provider, which | |
1332 | * maps a PM domain specifier retrieved from the device tree to a PM domain. | |
1333 | * | |
1334 | * Two simple mapping functions have been provided for convenience: | |
1335 | * - __of_genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. | |
1336 | * - __of_genpd_xlate_onecell() for mapping of multiple PM domains per node by | |
1337 | * index. | |
1338 | */ | |
1339 | ||
1340 | /** | |
1341 | * struct of_genpd_provider - PM domain provider registration structure | |
1342 | * @link: Entry in global list of PM domain providers | |
1343 | * @node: Pointer to device tree node of PM domain provider | |
1344 | * @xlate: Provider-specific xlate callback mapping a set of specifier cells | |
1345 | * into a PM domain. | |
1346 | * @data: context pointer to be passed into @xlate callback | |
1347 | */ | |
1348 | struct of_genpd_provider { | |
1349 | struct list_head link; | |
1350 | struct device_node *node; | |
1351 | genpd_xlate_t xlate; | |
1352 | void *data; | |
1353 | }; | |
1354 | ||
1355 | /* List of registered PM domain providers. */ | |
1356 | static LIST_HEAD(of_genpd_providers); | |
1357 | /* Mutex to protect the list above. */ | |
1358 | static DEFINE_MUTEX(of_genpd_mutex); | |
1359 | ||
1360 | /** | |
1361 | * __of_genpd_xlate_simple() - Xlate function for direct node-domain mapping | |
1362 | * @genpdspec: OF phandle args to map into a PM domain | |
1363 | * @data: xlate function private data - pointer to struct generic_pm_domain | |
1364 | * | |
1365 | * This is a generic xlate function that can be used to model PM domains that | |
1366 | * have their own device tree nodes. The private data of xlate function needs | |
1367 | * to be a valid pointer to struct generic_pm_domain. | |
1368 | */ | |
1369 | struct generic_pm_domain *__of_genpd_xlate_simple( | |
1370 | struct of_phandle_args *genpdspec, | |
1371 | void *data) | |
1372 | { | |
1373 | if (genpdspec->args_count != 0) | |
1374 | return ERR_PTR(-EINVAL); | |
1375 | return data; | |
1376 | } | |
1377 | EXPORT_SYMBOL_GPL(__of_genpd_xlate_simple); | |
1378 | ||
1379 | /** | |
1380 | * __of_genpd_xlate_onecell() - Xlate function using a single index. | |
1381 | * @genpdspec: OF phandle args to map into a PM domain | |
1382 | * @data: xlate function private data - pointer to struct genpd_onecell_data | |
1383 | * | |
1384 | * This is a generic xlate function that can be used to model simple PM domain | |
1385 | * controllers that have one device tree node and provide multiple PM domains. | |
1386 | * A single cell is used as an index into an array of PM domains specified in | |
1387 | * the genpd_onecell_data struct when registering the provider. | |
1388 | */ | |
1389 | struct generic_pm_domain *__of_genpd_xlate_onecell( | |
1390 | struct of_phandle_args *genpdspec, | |
1391 | void *data) | |
1392 | { | |
1393 | struct genpd_onecell_data *genpd_data = data; | |
1394 | unsigned int idx = genpdspec->args[0]; | |
1395 | ||
1396 | if (genpdspec->args_count != 1) | |
1397 | return ERR_PTR(-EINVAL); | |
1398 | ||
1399 | if (idx >= genpd_data->num_domains) { | |
1400 | pr_err("%s: invalid domain index %u\n", __func__, idx); | |
1401 | return ERR_PTR(-EINVAL); | |
1402 | } | |
1403 | ||
1404 | if (!genpd_data->domains[idx]) | |
1405 | return ERR_PTR(-ENOENT); | |
1406 | ||
1407 | return genpd_data->domains[idx]; | |
1408 | } | |
1409 | EXPORT_SYMBOL_GPL(__of_genpd_xlate_onecell); | |
1410 | ||
1411 | /** | |
1412 | * __of_genpd_add_provider() - Register a PM domain provider for a node | |
1413 | * @np: Device node pointer associated with the PM domain provider. | |
1414 | * @xlate: Callback for decoding PM domain from phandle arguments. | |
1415 | * @data: Context pointer for @xlate callback. | |
1416 | */ | |
1417 | int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, | |
1418 | void *data) | |
1419 | { | |
1420 | struct of_genpd_provider *cp; | |
1421 | ||
1422 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); | |
1423 | if (!cp) | |
1424 | return -ENOMEM; | |
1425 | ||
1426 | cp->node = of_node_get(np); | |
1427 | cp->data = data; | |
1428 | cp->xlate = xlate; | |
1429 | ||
1430 | mutex_lock(&of_genpd_mutex); | |
1431 | list_add(&cp->link, &of_genpd_providers); | |
1432 | mutex_unlock(&of_genpd_mutex); | |
1433 | pr_debug("Added domain provider from %s\n", np->full_name); | |
1434 | ||
1435 | return 0; | |
1436 | } | |
1437 | EXPORT_SYMBOL_GPL(__of_genpd_add_provider); | |
1438 | ||
1439 | /** | |
1440 | * of_genpd_del_provider() - Remove a previously registered PM domain provider | |
1441 | * @np: Device node pointer associated with the PM domain provider | |
1442 | */ | |
1443 | void of_genpd_del_provider(struct device_node *np) | |
1444 | { | |
1445 | struct of_genpd_provider *cp; | |
1446 | ||
1447 | mutex_lock(&of_genpd_mutex); | |
1448 | list_for_each_entry(cp, &of_genpd_providers, link) { | |
1449 | if (cp->node == np) { | |
1450 | list_del(&cp->link); | |
1451 | of_node_put(cp->node); | |
1452 | kfree(cp); | |
1453 | break; | |
1454 | } | |
1455 | } | |
1456 | mutex_unlock(&of_genpd_mutex); | |
1457 | } | |
1458 | EXPORT_SYMBOL_GPL(of_genpd_del_provider); | |
1459 | ||
1460 | /** | |
1461 | * of_genpd_get_from_provider() - Look-up PM domain | |
1462 | * @genpdspec: OF phandle args to use for look-up | |
1463 | * | |
1464 | * Looks for a PM domain provider under the node specified by @genpdspec and if | |
1465 | * found, uses xlate function of the provider to map phandle args to a PM | |
1466 | * domain. | |
1467 | * | |
1468 | * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() | |
1469 | * on failure. | |
1470 | */ | |
7496fcbe | 1471 | struct generic_pm_domain *of_genpd_get_from_provider( |
aa42240a TF |
1472 | struct of_phandle_args *genpdspec) |
1473 | { | |
1474 | struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); | |
1475 | struct of_genpd_provider *provider; | |
1476 | ||
41795a8a JH |
1477 | if (!genpdspec) |
1478 | return ERR_PTR(-EINVAL); | |
1479 | ||
aa42240a TF |
1480 | mutex_lock(&of_genpd_mutex); |
1481 | ||
1482 | /* Check if we have such a provider in our array */ | |
1483 | list_for_each_entry(provider, &of_genpd_providers, link) { | |
1484 | if (provider->node == genpdspec->np) | |
1485 | genpd = provider->xlate(genpdspec, provider->data); | |
1486 | if (!IS_ERR(genpd)) | |
1487 | break; | |
1488 | } | |
1489 | ||
1490 | mutex_unlock(&of_genpd_mutex); | |
1491 | ||
1492 | return genpd; | |
1493 | } | |
7496fcbe | 1494 | EXPORT_SYMBOL_GPL(of_genpd_get_from_provider); |
aa42240a TF |
1495 | |
1496 | /** | |
1497 | * genpd_dev_pm_detach - Detach a device from its PM domain. | |
8bb6944e | 1498 | * @dev: Device to detach. |
aa42240a TF |
1499 | * @power_off: Currently not used |
1500 | * | |
1501 | * Try to locate a corresponding generic PM domain, which the device was | |
1502 | * attached to previously. If such is found, the device is detached from it. | |
1503 | */ | |
1504 | static void genpd_dev_pm_detach(struct device *dev, bool power_off) | |
1505 | { | |
446d999c | 1506 | struct generic_pm_domain *pd; |
93af5e93 | 1507 | unsigned int i; |
aa42240a TF |
1508 | int ret = 0; |
1509 | ||
446d999c | 1510 | pd = pm_genpd_lookup_dev(dev); |
aa42240a TF |
1511 | if (!pd) |
1512 | return; | |
1513 | ||
1514 | dev_dbg(dev, "removing from PM domain %s\n", pd->name); | |
1515 | ||
93af5e93 | 1516 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
aa42240a TF |
1517 | ret = pm_genpd_remove_device(pd, dev); |
1518 | if (ret != -EAGAIN) | |
1519 | break; | |
93af5e93 GU |
1520 | |
1521 | mdelay(i); | |
aa42240a TF |
1522 | cond_resched(); |
1523 | } | |
1524 | ||
1525 | if (ret < 0) { | |
1526 | dev_err(dev, "failed to remove from PM domain %s: %d", | |
1527 | pd->name, ret); | |
1528 | return; | |
1529 | } | |
1530 | ||
1531 | /* Check if PM domain can be powered off after removing this device. */ | |
1532 | genpd_queue_power_off_work(pd); | |
1533 | } | |
1534 | ||
632f7ce3 RK |
1535 | static void genpd_dev_pm_sync(struct device *dev) |
1536 | { | |
1537 | struct generic_pm_domain *pd; | |
1538 | ||
1539 | pd = dev_to_genpd(dev); | |
1540 | if (IS_ERR(pd)) | |
1541 | return; | |
1542 | ||
1543 | genpd_queue_power_off_work(pd); | |
1544 | } | |
1545 | ||
aa42240a TF |
1546 | /** |
1547 | * genpd_dev_pm_attach - Attach a device to its PM domain using DT. | |
1548 | * @dev: Device to attach. | |
1549 | * | |
1550 | * Parse device's OF node to find a PM domain specifier. If such is found, | |
1551 | * attaches the device to retrieved pm_domain ops. | |
1552 | * | |
1553 | * Both generic and legacy Samsung-specific DT bindings are supported to keep | |
1554 | * backwards compatibility with existing DTBs. | |
1555 | * | |
311fa6ad JH |
1556 | * Returns 0 on successfully attached PM domain or negative error code. Note |
1557 | * that if a power-domain exists for the device, but it cannot be found or | |
1558 | * turned on, then return -EPROBE_DEFER to ensure that the device is not | |
1559 | * probed and to re-try again later. | |
aa42240a TF |
1560 | */ |
1561 | int genpd_dev_pm_attach(struct device *dev) | |
1562 | { | |
1563 | struct of_phandle_args pd_args; | |
1564 | struct generic_pm_domain *pd; | |
93af5e93 | 1565 | unsigned int i; |
aa42240a TF |
1566 | int ret; |
1567 | ||
1568 | if (!dev->of_node) | |
1569 | return -ENODEV; | |
1570 | ||
1571 | if (dev->pm_domain) | |
1572 | return -EEXIST; | |
1573 | ||
1574 | ret = of_parse_phandle_with_args(dev->of_node, "power-domains", | |
1575 | "#power-domain-cells", 0, &pd_args); | |
1576 | if (ret < 0) { | |
1577 | if (ret != -ENOENT) | |
1578 | return ret; | |
1579 | ||
1580 | /* | |
1581 | * Try legacy Samsung-specific bindings | |
1582 | * (for backwards compatibility of DT ABI) | |
1583 | */ | |
1584 | pd_args.args_count = 0; | |
1585 | pd_args.np = of_parse_phandle(dev->of_node, | |
1586 | "samsung,power-domain", 0); | |
1587 | if (!pd_args.np) | |
1588 | return -ENOENT; | |
1589 | } | |
1590 | ||
1591 | pd = of_genpd_get_from_provider(&pd_args); | |
265e2cf6 | 1592 | of_node_put(pd_args.np); |
aa42240a TF |
1593 | if (IS_ERR(pd)) { |
1594 | dev_dbg(dev, "%s() failed to find PM domain: %ld\n", | |
1595 | __func__, PTR_ERR(pd)); | |
311fa6ad | 1596 | return -EPROBE_DEFER; |
aa42240a TF |
1597 | } |
1598 | ||
1599 | dev_dbg(dev, "adding to PM domain %s\n", pd->name); | |
1600 | ||
93af5e93 | 1601 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
aa42240a TF |
1602 | ret = pm_genpd_add_device(pd, dev); |
1603 | if (ret != -EAGAIN) | |
1604 | break; | |
93af5e93 GU |
1605 | |
1606 | mdelay(i); | |
aa42240a TF |
1607 | cond_resched(); |
1608 | } | |
1609 | ||
1610 | if (ret < 0) { | |
1611 | dev_err(dev, "failed to add to PM domain %s: %d", | |
1612 | pd->name, ret); | |
311fa6ad | 1613 | goto out; |
aa42240a TF |
1614 | } |
1615 | ||
1616 | dev->pm_domain->detach = genpd_dev_pm_detach; | |
632f7ce3 | 1617 | dev->pm_domain->sync = genpd_dev_pm_sync; |
aa42240a | 1618 | |
53af16f7 UH |
1619 | mutex_lock(&pd->lock); |
1620 | ret = genpd_poweron(pd, 0); | |
1621 | mutex_unlock(&pd->lock); | |
311fa6ad JH |
1622 | out: |
1623 | return ret ? -EPROBE_DEFER : 0; | |
aa42240a TF |
1624 | } |
1625 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); | |
d30d819d | 1626 | #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ |
2bd5306a MM |
1627 | |
1628 | ||
1629 | /*** debugfs support ***/ | |
1630 | ||
1631 | #ifdef CONFIG_PM_ADVANCED_DEBUG | |
1632 | #include <linux/pm.h> | |
1633 | #include <linux/device.h> | |
1634 | #include <linux/debugfs.h> | |
1635 | #include <linux/seq_file.h> | |
1636 | #include <linux/init.h> | |
1637 | #include <linux/kobject.h> | |
1638 | static struct dentry *pm_genpd_debugfs_dir; | |
1639 | ||
1640 | /* | |
1641 | * TODO: This function is a slightly modified version of rtpm_status_show | |
d30d819d | 1642 | * from sysfs.c, so generalize it. |
2bd5306a | 1643 | */ |
2bd5306a MM |
1644 | static void rtpm_status_str(struct seq_file *s, struct device *dev) |
1645 | { | |
1646 | static const char * const status_lookup[] = { | |
1647 | [RPM_ACTIVE] = "active", | |
1648 | [RPM_RESUMING] = "resuming", | |
1649 | [RPM_SUSPENDED] = "suspended", | |
1650 | [RPM_SUSPENDING] = "suspending" | |
1651 | }; | |
1652 | const char *p = ""; | |
1653 | ||
1654 | if (dev->power.runtime_error) | |
1655 | p = "error"; | |
1656 | else if (dev->power.disable_depth) | |
1657 | p = "unsupported"; | |
1658 | else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) | |
1659 | p = status_lookup[dev->power.runtime_status]; | |
1660 | else | |
1661 | WARN_ON(1); | |
1662 | ||
1663 | seq_puts(s, p); | |
1664 | } | |
2bd5306a MM |
1665 | |
1666 | static int pm_genpd_summary_one(struct seq_file *s, | |
66a5ca4b | 1667 | struct generic_pm_domain *genpd) |
2bd5306a MM |
1668 | { |
1669 | static const char * const status_lookup[] = { | |
1670 | [GPD_STATE_ACTIVE] = "on", | |
2bd5306a MM |
1671 | [GPD_STATE_POWER_OFF] = "off" |
1672 | }; | |
1673 | struct pm_domain_data *pm_data; | |
1674 | const char *kobj_path; | |
1675 | struct gpd_link *link; | |
6954d432 | 1676 | char state[16]; |
2bd5306a MM |
1677 | int ret; |
1678 | ||
66a5ca4b | 1679 | ret = mutex_lock_interruptible(&genpd->lock); |
2bd5306a MM |
1680 | if (ret) |
1681 | return -ERESTARTSYS; | |
1682 | ||
66a5ca4b | 1683 | if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup))) |
2bd5306a | 1684 | goto exit; |
fc5cbf0c | 1685 | if (genpd->status == GPD_STATE_POWER_OFF) |
0ba554e4 | 1686 | snprintf(state, sizeof(state), "%s-%u", |
6954d432 | 1687 | status_lookup[genpd->status], genpd->state_idx); |
fc5cbf0c | 1688 | else |
6954d432 GU |
1689 | snprintf(state, sizeof(state), "%s", |
1690 | status_lookup[genpd->status]); | |
1691 | seq_printf(s, "%-30s %-15s ", genpd->name, state); | |
2bd5306a MM |
1692 | |
1693 | /* | |
1694 | * Modifications on the list require holding locks on both | |
1695 | * master and slave, so we are safe. | |
66a5ca4b | 1696 | * Also genpd->name is immutable. |
2bd5306a | 1697 | */ |
66a5ca4b | 1698 | list_for_each_entry(link, &genpd->master_links, master_node) { |
2bd5306a | 1699 | seq_printf(s, "%s", link->slave->name); |
66a5ca4b | 1700 | if (!list_is_last(&link->master_node, &genpd->master_links)) |
2bd5306a MM |
1701 | seq_puts(s, ", "); |
1702 | } | |
1703 | ||
66a5ca4b | 1704 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { |
2bd5306a MM |
1705 | kobj_path = kobject_get_path(&pm_data->dev->kobj, GFP_KERNEL); |
1706 | if (kobj_path == NULL) | |
1707 | continue; | |
1708 | ||
1709 | seq_printf(s, "\n %-50s ", kobj_path); | |
1710 | rtpm_status_str(s, pm_data->dev); | |
1711 | kfree(kobj_path); | |
1712 | } | |
1713 | ||
1714 | seq_puts(s, "\n"); | |
1715 | exit: | |
66a5ca4b | 1716 | mutex_unlock(&genpd->lock); |
2bd5306a MM |
1717 | |
1718 | return 0; | |
1719 | } | |
1720 | ||
1721 | static int pm_genpd_summary_show(struct seq_file *s, void *data) | |
1722 | { | |
66a5ca4b | 1723 | struct generic_pm_domain *genpd; |
2bd5306a MM |
1724 | int ret = 0; |
1725 | ||
15dec67a GU |
1726 | seq_puts(s, "domain status slaves\n"); |
1727 | seq_puts(s, " /device runtime status\n"); | |
2bd5306a MM |
1728 | seq_puts(s, "----------------------------------------------------------------------\n"); |
1729 | ||
1730 | ret = mutex_lock_interruptible(&gpd_list_lock); | |
1731 | if (ret) | |
1732 | return -ERESTARTSYS; | |
1733 | ||
66a5ca4b KH |
1734 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
1735 | ret = pm_genpd_summary_one(s, genpd); | |
2bd5306a MM |
1736 | if (ret) |
1737 | break; | |
1738 | } | |
1739 | mutex_unlock(&gpd_list_lock); | |
1740 | ||
1741 | return ret; | |
1742 | } | |
1743 | ||
1744 | static int pm_genpd_summary_open(struct inode *inode, struct file *file) | |
1745 | { | |
1746 | return single_open(file, pm_genpd_summary_show, NULL); | |
1747 | } | |
1748 | ||
1749 | static const struct file_operations pm_genpd_summary_fops = { | |
1750 | .open = pm_genpd_summary_open, | |
1751 | .read = seq_read, | |
1752 | .llseek = seq_lseek, | |
1753 | .release = single_release, | |
1754 | }; | |
1755 | ||
1756 | static int __init pm_genpd_debug_init(void) | |
1757 | { | |
1758 | struct dentry *d; | |
1759 | ||
1760 | pm_genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); | |
1761 | ||
1762 | if (!pm_genpd_debugfs_dir) | |
1763 | return -ENOMEM; | |
1764 | ||
1765 | d = debugfs_create_file("pm_genpd_summary", S_IRUGO, | |
1766 | pm_genpd_debugfs_dir, NULL, &pm_genpd_summary_fops); | |
1767 | if (!d) | |
1768 | return -ENOMEM; | |
1769 | ||
1770 | return 0; | |
1771 | } | |
1772 | late_initcall(pm_genpd_debug_init); | |
1773 | ||
1774 | static void __exit pm_genpd_debug_exit(void) | |
1775 | { | |
1776 | debugfs_remove_recursive(pm_genpd_debugfs_dir); | |
1777 | } | |
1778 | __exitcall(pm_genpd_debug_exit); | |
1779 | #endif /* CONFIG_PM_ADVANCED_DEBUG */ |