2 * drivers/base/power/domain.c - Common code related to device power domains.
4 * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp.
6 * This file is released under the GPLv2.
9 #include <linux/delay.h>
10 #include <linux/kernel.h>
12 #include <linux/platform_device.h>
13 #include <linux/pm_runtime.h>
14 #include <linux/pm_domain.h>
15 #include <linux/pm_qos.h>
16 #include <linux/pm_clock.h>
17 #include <linux/slab.h>
18 #include <linux/err.h>
19 #include <linux/sched.h>
20 #include <linux/suspend.h>
21 #include <linux/export.h>
23 #define GENPD_RETRY_MAX_MS 250 /* Approximate */
25 #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \
27 type (*__routine)(struct device *__d); \
28 type __ret = (type)0; \
30 __routine = genpd->dev_ops.callback; \
32 __ret = __routine(dev); \
37 #define GENPD_DEV_TIMED_CALLBACK(genpd, type, callback, dev, field, name) \
39 ktime_t __start = ktime_get(); \
40 type __retval = GENPD_DEV_CALLBACK(genpd, type, callback, dev); \
41 s64 __elapsed = ktime_to_ns(ktime_sub(ktime_get(), __start)); \
42 struct gpd_timing_data *__td = &dev_gpd_data(dev)->td; \
43 if (!__retval && __elapsed > __td->field) { \
44 __td->field = __elapsed; \
45 dev_dbg(dev, name " latency exceeded, new value %lld ns\n", \
47 genpd->max_off_time_changed = true; \
48 __td->constraint_changed = true; \
53 static LIST_HEAD(gpd_list);
54 static DEFINE_MUTEX(gpd_list_lock);
57 * Get the generic PM domain for a particular struct device.
58 * This validates the struct device pointer, the PM domain pointer,
59 * and checks that the PM domain pointer is a real generic PM domain.
60 * Any failure results in NULL being returned.
62 struct generic_pm_domain *pm_genpd_lookup_dev(struct device *dev)
64 struct generic_pm_domain *genpd = NULL, *gpd;
66 if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain))
69 mutex_lock(&gpd_list_lock);
70 list_for_each_entry(gpd, &gpd_list, gpd_list_node) {
71 if (&gpd->domain == dev->pm_domain) {
76 mutex_unlock(&gpd_list_lock);
82 * This should only be used where we are certain that the pm_domain
83 * attached to the device is a genpd domain.
85 static struct generic_pm_domain *dev_to_genpd(struct device *dev)
87 if (IS_ERR_OR_NULL(dev->pm_domain))
88 return ERR_PTR(-EINVAL);
90 return pd_to_genpd(dev->pm_domain);
93 static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev,
97 return GENPD_DEV_CALLBACK(genpd, int, stop, dev);
99 return GENPD_DEV_TIMED_CALLBACK(genpd, int, stop, dev,
100 stop_latency_ns, "stop");
103 static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev,
107 return GENPD_DEV_CALLBACK(genpd, int, start, dev);
109 return GENPD_DEV_TIMED_CALLBACK(genpd, int, start, dev,
110 start_latency_ns, "start");
113 static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd)
117 if (!WARN_ON(atomic_read(&genpd->sd_count) == 0))
118 ret = !!atomic_dec_and_test(&genpd->sd_count);
123 static void genpd_sd_counter_inc(struct generic_pm_domain *genpd)
125 atomic_inc(&genpd->sd_count);
126 smp_mb__after_atomic();
129 static int genpd_power_on(struct generic_pm_domain *genpd, bool timed)
135 if (!genpd->power_on)
139 return genpd->power_on(genpd);
141 time_start = ktime_get();
142 ret = genpd->power_on(genpd);
146 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
147 if (elapsed_ns <= genpd->power_on_latency_ns)
150 genpd->power_on_latency_ns = elapsed_ns;
151 genpd->max_off_time_changed = true;
152 pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
153 genpd->name, "on", elapsed_ns);
158 static int genpd_power_off(struct generic_pm_domain *genpd, bool timed)
164 if (!genpd->power_off)
168 return genpd->power_off(genpd);
170 time_start = ktime_get();
171 ret = genpd->power_off(genpd);
175 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
176 if (elapsed_ns <= genpd->power_off_latency_ns)
179 genpd->power_off_latency_ns = elapsed_ns;
180 genpd->max_off_time_changed = true;
181 pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
182 genpd->name, "off", elapsed_ns);
188 * genpd_queue_power_off_work - Queue up the execution of genpd_poweroff().
189 * @genpd: PM domait to power off.
191 * Queue up the execution of genpd_poweroff() unless it's already been done
194 static void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
196 queue_work(pm_wq, &genpd->power_off_work);
199 static int genpd_poweron(struct generic_pm_domain *genpd);
202 * __genpd_poweron - Restore power to a given PM domain and its masters.
203 * @genpd: PM domain to power up.
205 * Restore power to @genpd and all of its masters so that it is possible to
206 * resume a device belonging to it.
208 static int __genpd_poweron(struct generic_pm_domain *genpd)
210 struct gpd_link *link;
213 if (genpd->status == GPD_STATE_ACTIVE
214 || (genpd->prepared_count > 0 && genpd->suspend_power_off))
218 * The list is guaranteed not to change while the loop below is being
219 * executed, unless one of the masters' .power_on() callbacks fiddles
222 list_for_each_entry(link, &genpd->slave_links, slave_node) {
223 genpd_sd_counter_inc(link->master);
225 ret = genpd_poweron(link->master);
227 genpd_sd_counter_dec(link->master);
232 ret = genpd_power_on(genpd, true);
236 genpd->status = GPD_STATE_ACTIVE;
240 list_for_each_entry_continue_reverse(link,
243 genpd_sd_counter_dec(link->master);
244 genpd_queue_power_off_work(link->master);
251 * genpd_poweron - Restore power to a given PM domain and its masters.
252 * @genpd: PM domain to power up.
254 static int genpd_poweron(struct generic_pm_domain *genpd)
258 mutex_lock(&genpd->lock);
259 ret = __genpd_poweron(genpd);
260 mutex_unlock(&genpd->lock);
264 static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev)
266 return GENPD_DEV_TIMED_CALLBACK(genpd, int, save_state, dev,
267 save_state_latency_ns, "state save");
270 static int genpd_restore_dev(struct generic_pm_domain *genpd,
271 struct device *dev, bool timed)
274 return GENPD_DEV_CALLBACK(genpd, int, restore_state, dev);
276 return GENPD_DEV_TIMED_CALLBACK(genpd, int, restore_state, dev,
277 restore_state_latency_ns,
281 static int genpd_dev_pm_qos_notifier(struct notifier_block *nb,
282 unsigned long val, void *ptr)
284 struct generic_pm_domain_data *gpd_data;
287 gpd_data = container_of(nb, struct generic_pm_domain_data, nb);
288 dev = gpd_data->base.dev;
291 struct generic_pm_domain *genpd;
292 struct pm_domain_data *pdd;
294 spin_lock_irq(&dev->power.lock);
296 pdd = dev->power.subsys_data ?
297 dev->power.subsys_data->domain_data : NULL;
298 if (pdd && pdd->dev) {
299 to_gpd_data(pdd)->td.constraint_changed = true;
300 genpd = dev_to_genpd(dev);
302 genpd = ERR_PTR(-ENODATA);
305 spin_unlock_irq(&dev->power.lock);
307 if (!IS_ERR(genpd)) {
308 mutex_lock(&genpd->lock);
309 genpd->max_off_time_changed = true;
310 mutex_unlock(&genpd->lock);
314 if (!dev || dev->power.ignore_children)
322 * genpd_poweroff - Remove power from a given PM domain.
323 * @genpd: PM domain to power down.
324 * @is_async: PM domain is powered down from a scheduled work
326 * If all of the @genpd's devices have been suspended and all of its subdomains
327 * have been powered down, remove power from @genpd.
329 static int genpd_poweroff(struct generic_pm_domain *genpd, bool is_async)
331 struct pm_domain_data *pdd;
332 struct gpd_link *link;
333 unsigned int not_suspended = 0;
336 * Do not try to power off the domain in the following situations:
337 * (1) The domain is already in the "power off" state.
338 * (2) System suspend is in progress.
340 if (genpd->status == GPD_STATE_POWER_OFF
341 || genpd->prepared_count > 0)
344 if (atomic_read(&genpd->sd_count) > 0)
347 list_for_each_entry(pdd, &genpd->dev_list, list_node) {
348 enum pm_qos_flags_status stat;
350 stat = dev_pm_qos_flags(pdd->dev,
351 PM_QOS_FLAG_NO_POWER_OFF
352 | PM_QOS_FLAG_REMOTE_WAKEUP);
353 if (stat > PM_QOS_FLAGS_NONE)
356 if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev)
357 || pdd->dev->power.irq_safe))
361 if (not_suspended > 1 || (not_suspended == 1 && is_async))
364 if (genpd->gov && genpd->gov->power_down_ok) {
365 if (!genpd->gov->power_down_ok(&genpd->domain))
369 if (genpd->power_off) {
372 if (atomic_read(&genpd->sd_count) > 0)
376 * If sd_count > 0 at this point, one of the subdomains hasn't
377 * managed to call genpd_poweron() for the master yet after
378 * incrementing it. In that case genpd_poweron() will wait
379 * for us to drop the lock, so we can call .power_off() and let
380 * the genpd_poweron() restore power for us (this shouldn't
381 * happen very often).
383 ret = genpd_power_off(genpd, true);
388 genpd->status = GPD_STATE_POWER_OFF;
390 list_for_each_entry(link, &genpd->slave_links, slave_node) {
391 genpd_sd_counter_dec(link->master);
392 genpd_queue_power_off_work(link->master);
399 * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0.
400 * @work: Work structure used for scheduling the execution of this function.
402 static void genpd_power_off_work_fn(struct work_struct *work)
404 struct generic_pm_domain *genpd;
406 genpd = container_of(work, struct generic_pm_domain, power_off_work);
408 mutex_lock(&genpd->lock);
409 genpd_poweroff(genpd, true);
410 mutex_unlock(&genpd->lock);
414 * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain.
415 * @dev: Device to suspend.
417 * Carry out a runtime suspend of a device under the assumption that its
418 * pm_domain field points to the domain member of an object of type
419 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
421 static int pm_genpd_runtime_suspend(struct device *dev)
423 struct generic_pm_domain *genpd;
424 bool (*stop_ok)(struct device *__dev);
427 dev_dbg(dev, "%s()\n", __func__);
429 genpd = dev_to_genpd(dev);
433 stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL;
434 if (stop_ok && !stop_ok(dev))
437 ret = genpd_save_dev(genpd, dev);
441 ret = genpd_stop_dev(genpd, dev, true);
443 genpd_restore_dev(genpd, dev, true);
448 * If power.irq_safe is set, this routine will be run with interrupts
449 * off, so it can't use mutexes.
451 if (dev->power.irq_safe)
454 mutex_lock(&genpd->lock);
455 genpd_poweroff(genpd, false);
456 mutex_unlock(&genpd->lock);
462 * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain.
463 * @dev: Device to resume.
465 * Carry out a runtime resume of a device under the assumption that its
466 * pm_domain field points to the domain member of an object of type
467 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
469 static int pm_genpd_runtime_resume(struct device *dev)
471 struct generic_pm_domain *genpd;
475 dev_dbg(dev, "%s()\n", __func__);
477 genpd = dev_to_genpd(dev);
481 /* If power.irq_safe, the PM domain is never powered off. */
482 if (dev->power.irq_safe) {
487 mutex_lock(&genpd->lock);
488 ret = __genpd_poweron(genpd);
489 mutex_unlock(&genpd->lock);
495 genpd_start_dev(genpd, dev, timed);
496 genpd_restore_dev(genpd, dev, timed);
501 static bool pd_ignore_unused;
502 static int __init pd_ignore_unused_setup(char *__unused)
504 pd_ignore_unused = true;
507 __setup("pd_ignore_unused", pd_ignore_unused_setup);
510 * genpd_poweroff_unused - Power off all PM domains with no devices in use.
512 static int __init genpd_poweroff_unused(void)
514 struct generic_pm_domain *genpd;
516 if (pd_ignore_unused) {
517 pr_warn("genpd: Not disabling unused power domains\n");
521 mutex_lock(&gpd_list_lock);
523 list_for_each_entry(genpd, &gpd_list, gpd_list_node)
524 genpd_queue_power_off_work(genpd);
526 mutex_unlock(&gpd_list_lock);
530 late_initcall(genpd_poweroff_unused);
532 #ifdef CONFIG_PM_SLEEP
535 * pm_genpd_present - Check if the given PM domain has been initialized.
536 * @genpd: PM domain to check.
538 static bool pm_genpd_present(const struct generic_pm_domain *genpd)
540 const struct generic_pm_domain *gpd;
542 if (IS_ERR_OR_NULL(genpd))
545 list_for_each_entry(gpd, &gpd_list, gpd_list_node)
552 static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd,
555 return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev);
559 * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters.
560 * @genpd: PM domain to power off, if possible.
561 * @timed: True if latency measurements are allowed.
563 * Check if the given PM domain can be powered off (during system suspend or
564 * hibernation) and do that if so. Also, in that case propagate to its masters.
566 * This function is only called in "noirq" and "syscore" stages of system power
567 * transitions, so it need not acquire locks (all of the "noirq" callbacks are
568 * executed sequentially, so it is guaranteed that it will never run twice in
571 static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd,
574 struct gpd_link *link;
576 if (genpd->status == GPD_STATE_POWER_OFF)
579 if (genpd->suspended_count != genpd->device_count
580 || atomic_read(&genpd->sd_count) > 0)
583 genpd_power_off(genpd, timed);
585 genpd->status = GPD_STATE_POWER_OFF;
587 list_for_each_entry(link, &genpd->slave_links, slave_node) {
588 genpd_sd_counter_dec(link->master);
589 pm_genpd_sync_poweroff(link->master, timed);
594 * pm_genpd_sync_poweron - Synchronously power on a PM domain and its masters.
595 * @genpd: PM domain to power on.
596 * @timed: True if latency measurements are allowed.
598 * This function is only called in "noirq" and "syscore" stages of system power
599 * transitions, so it need not acquire locks (all of the "noirq" callbacks are
600 * executed sequentially, so it is guaranteed that it will never run twice in
603 static void pm_genpd_sync_poweron(struct generic_pm_domain *genpd,
606 struct gpd_link *link;
608 if (genpd->status == GPD_STATE_ACTIVE)
611 list_for_each_entry(link, &genpd->slave_links, slave_node) {
612 pm_genpd_sync_poweron(link->master, timed);
613 genpd_sd_counter_inc(link->master);
616 genpd_power_on(genpd, timed);
618 genpd->status = GPD_STATE_ACTIVE;
622 * resume_needed - Check whether to resume a device before system suspend.
623 * @dev: Device to check.
624 * @genpd: PM domain the device belongs to.
626 * There are two cases in which a device that can wake up the system from sleep
627 * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled
628 * to wake up the system and it has to remain active for this purpose while the
629 * system is in the sleep state and (2) if the device is not enabled to wake up
630 * the system from sleep states and it generally doesn't generate wakeup signals
631 * by itself (those signals are generated on its behalf by other parts of the
632 * system). In the latter case it may be necessary to reconfigure the device's
633 * wakeup settings during system suspend, because it may have been set up to
634 * signal remote wakeup from the system's working state as needed by runtime PM.
635 * Return 'true' in either of the above cases.
637 static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd)
641 if (!device_can_wakeup(dev))
644 active_wakeup = genpd_dev_active_wakeup(genpd, dev);
645 return device_may_wakeup(dev) ? active_wakeup : !active_wakeup;
649 * pm_genpd_prepare - Start power transition of a device in a PM domain.
650 * @dev: Device to start the transition of.
652 * Start a power transition of a device (during a system-wide power transition)
653 * under the assumption that its pm_domain field points to the domain member of
654 * an object of type struct generic_pm_domain representing a PM domain
655 * consisting of I/O devices.
657 static int pm_genpd_prepare(struct device *dev)
659 struct generic_pm_domain *genpd;
662 dev_dbg(dev, "%s()\n", __func__);
664 genpd = dev_to_genpd(dev);
669 * If a wakeup request is pending for the device, it should be woken up
670 * at this point and a system wakeup event should be reported if it's
671 * set up to wake up the system from sleep states.
673 pm_runtime_get_noresume(dev);
674 if (pm_runtime_barrier(dev) && device_may_wakeup(dev))
675 pm_wakeup_event(dev, 0);
677 if (pm_wakeup_pending()) {
682 if (resume_needed(dev, genpd))
683 pm_runtime_resume(dev);
685 mutex_lock(&genpd->lock);
687 if (genpd->prepared_count++ == 0) {
688 genpd->suspended_count = 0;
689 genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF;
692 mutex_unlock(&genpd->lock);
694 if (genpd->suspend_power_off) {
695 pm_runtime_put_noidle(dev);
700 * The PM domain must be in the GPD_STATE_ACTIVE state at this point,
701 * so genpd_poweron() will return immediately, but if the device
702 * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need
703 * to make it operational.
705 pm_runtime_resume(dev);
706 __pm_runtime_disable(dev, false);
708 ret = pm_generic_prepare(dev);
710 mutex_lock(&genpd->lock);
712 if (--genpd->prepared_count == 0)
713 genpd->suspend_power_off = false;
715 mutex_unlock(&genpd->lock);
716 pm_runtime_enable(dev);
724 * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain.
725 * @dev: Device to suspend.
727 * Suspend a device under the assumption that its pm_domain field points to the
728 * domain member of an object of type struct generic_pm_domain representing
729 * a PM domain consisting of I/O devices.
731 static int pm_genpd_suspend(struct device *dev)
733 struct generic_pm_domain *genpd;
735 dev_dbg(dev, "%s()\n", __func__);
737 genpd = dev_to_genpd(dev);
741 return genpd->suspend_power_off ? 0 : pm_generic_suspend(dev);
745 * pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain.
746 * @dev: Device to suspend.
748 * Carry out a late suspend of a device under the assumption that its
749 * pm_domain field points to the domain member of an object of type
750 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
752 static int pm_genpd_suspend_late(struct device *dev)
754 struct generic_pm_domain *genpd;
756 dev_dbg(dev, "%s()\n", __func__);
758 genpd = dev_to_genpd(dev);
762 return genpd->suspend_power_off ? 0 : pm_generic_suspend_late(dev);
766 * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain.
767 * @dev: Device to suspend.
769 * Stop the device and remove power from the domain if all devices in it have
772 static int pm_genpd_suspend_noirq(struct device *dev)
774 struct generic_pm_domain *genpd;
776 dev_dbg(dev, "%s()\n", __func__);
778 genpd = dev_to_genpd(dev);
782 if (genpd->suspend_power_off
783 || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)))
786 genpd_stop_dev(genpd, dev, false);
789 * Since all of the "noirq" callbacks are executed sequentially, it is
790 * guaranteed that this function will never run twice in parallel for
791 * the same PM domain, so it is not necessary to use locking here.
793 genpd->suspended_count++;
794 pm_genpd_sync_poweroff(genpd, true);
800 * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain.
801 * @dev: Device to resume.
803 * Restore power to the device's PM domain, if necessary, and start the device.
805 static int pm_genpd_resume_noirq(struct device *dev)
807 struct generic_pm_domain *genpd;
809 dev_dbg(dev, "%s()\n", __func__);
811 genpd = dev_to_genpd(dev);
815 if (genpd->suspend_power_off
816 || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)))
820 * Since all of the "noirq" callbacks are executed sequentially, it is
821 * guaranteed that this function will never run twice in parallel for
822 * the same PM domain, so it is not necessary to use locking here.
824 pm_genpd_sync_poweron(genpd, true);
825 genpd->suspended_count--;
827 return genpd_start_dev(genpd, dev, false);
831 * pm_genpd_resume_early - Early resume of a device in an I/O PM domain.
832 * @dev: Device to resume.
834 * Carry out an early resume of a device under the assumption that its
835 * pm_domain field points to the domain member of an object of type
836 * struct generic_pm_domain representing a power domain consisting of I/O
839 static int pm_genpd_resume_early(struct device *dev)
841 struct generic_pm_domain *genpd;
843 dev_dbg(dev, "%s()\n", __func__);
845 genpd = dev_to_genpd(dev);
849 return genpd->suspend_power_off ? 0 : pm_generic_resume_early(dev);
853 * pm_genpd_resume - Resume of device in an I/O PM domain.
854 * @dev: Device to resume.
856 * Resume a device under the assumption that its pm_domain field points to the
857 * domain member of an object of type struct generic_pm_domain representing
858 * a power domain consisting of I/O devices.
860 static int pm_genpd_resume(struct device *dev)
862 struct generic_pm_domain *genpd;
864 dev_dbg(dev, "%s()\n", __func__);
866 genpd = dev_to_genpd(dev);
870 return genpd->suspend_power_off ? 0 : pm_generic_resume(dev);
874 * pm_genpd_freeze - Freezing a device in an I/O PM domain.
875 * @dev: Device to freeze.
877 * Freeze a device under the assumption that its pm_domain field points to the
878 * domain member of an object of type struct generic_pm_domain representing
879 * a power domain consisting of I/O devices.
881 static int pm_genpd_freeze(struct device *dev)
883 struct generic_pm_domain *genpd;
885 dev_dbg(dev, "%s()\n", __func__);
887 genpd = dev_to_genpd(dev);
891 return genpd->suspend_power_off ? 0 : pm_generic_freeze(dev);
895 * pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain.
896 * @dev: Device to freeze.
898 * Carry out a late freeze of a device under the assumption that its
899 * pm_domain field points to the domain member of an object of type
900 * struct generic_pm_domain representing a power domain consisting of I/O
903 static int pm_genpd_freeze_late(struct device *dev)
905 struct generic_pm_domain *genpd;
907 dev_dbg(dev, "%s()\n", __func__);
909 genpd = dev_to_genpd(dev);
913 return genpd->suspend_power_off ? 0 : pm_generic_freeze_late(dev);
917 * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain.
918 * @dev: Device to freeze.
920 * Carry out a late freeze of a device under the assumption that its
921 * pm_domain field points to the domain member of an object of type
922 * struct generic_pm_domain representing a power domain consisting of I/O
925 static int pm_genpd_freeze_noirq(struct device *dev)
927 struct generic_pm_domain *genpd;
929 dev_dbg(dev, "%s()\n", __func__);
931 genpd = dev_to_genpd(dev);
935 return genpd->suspend_power_off ? 0 : genpd_stop_dev(genpd, dev, false);
939 * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain.
940 * @dev: Device to thaw.
942 * Start the device, unless power has been removed from the domain already
943 * before the system transition.
945 static int pm_genpd_thaw_noirq(struct device *dev)
947 struct generic_pm_domain *genpd;
949 dev_dbg(dev, "%s()\n", __func__);
951 genpd = dev_to_genpd(dev);
955 return genpd->suspend_power_off ?
956 0 : genpd_start_dev(genpd, dev, false);
960 * pm_genpd_thaw_early - Early thaw of device in an I/O PM domain.
961 * @dev: Device to thaw.
963 * Carry out an early thaw of a device under the assumption that its
964 * pm_domain field points to the domain member of an object of type
965 * struct generic_pm_domain representing a power domain consisting of I/O
968 static int pm_genpd_thaw_early(struct device *dev)
970 struct generic_pm_domain *genpd;
972 dev_dbg(dev, "%s()\n", __func__);
974 genpd = dev_to_genpd(dev);
978 return genpd->suspend_power_off ? 0 : pm_generic_thaw_early(dev);
982 * pm_genpd_thaw - Thaw a device belonging to an I/O power domain.
983 * @dev: Device to thaw.
985 * Thaw a device under the assumption that its pm_domain field points to the
986 * domain member of an object of type struct generic_pm_domain representing
987 * a power domain consisting of I/O devices.
989 static int pm_genpd_thaw(struct device *dev)
991 struct generic_pm_domain *genpd;
993 dev_dbg(dev, "%s()\n", __func__);
995 genpd = dev_to_genpd(dev);
999 return genpd->suspend_power_off ? 0 : pm_generic_thaw(dev);
1003 * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain.
1004 * @dev: Device to resume.
1006 * Make sure the domain will be in the same power state as before the
1007 * hibernation the system is resuming from and start the device if necessary.
1009 static int pm_genpd_restore_noirq(struct device *dev)
1011 struct generic_pm_domain *genpd;
1013 dev_dbg(dev, "%s()\n", __func__);
1015 genpd = dev_to_genpd(dev);
1020 * Since all of the "noirq" callbacks are executed sequentially, it is
1021 * guaranteed that this function will never run twice in parallel for
1022 * the same PM domain, so it is not necessary to use locking here.
1024 * At this point suspended_count == 0 means we are being run for the
1025 * first time for the given domain in the present cycle.
1027 if (genpd->suspended_count++ == 0) {
1029 * The boot kernel might put the domain into arbitrary state,
1030 * so make it appear as powered off to pm_genpd_sync_poweron(),
1031 * so that it tries to power it on in case it was really off.
1033 genpd->status = GPD_STATE_POWER_OFF;
1034 if (genpd->suspend_power_off) {
1036 * If the domain was off before the hibernation, make
1037 * sure it will be off going forward.
1039 genpd_power_off(genpd, true);
1045 if (genpd->suspend_power_off)
1048 pm_genpd_sync_poweron(genpd, true);
1050 return genpd_start_dev(genpd, dev, false);
1054 * pm_genpd_complete - Complete power transition of a device in a power domain.
1055 * @dev: Device to complete the transition of.
1057 * Complete a power transition of a device (during a system-wide power
1058 * transition) under the assumption that its pm_domain field points to the
1059 * domain member of an object of type struct generic_pm_domain representing
1060 * a power domain consisting of I/O devices.
1062 static void pm_genpd_complete(struct device *dev)
1064 struct generic_pm_domain *genpd;
1067 dev_dbg(dev, "%s()\n", __func__);
1069 genpd = dev_to_genpd(dev);
1073 mutex_lock(&genpd->lock);
1075 run_complete = !genpd->suspend_power_off;
1076 if (--genpd->prepared_count == 0)
1077 genpd->suspend_power_off = false;
1079 mutex_unlock(&genpd->lock);
1082 pm_generic_complete(dev);
1083 pm_runtime_set_active(dev);
1084 pm_runtime_enable(dev);
1085 pm_request_idle(dev);
1090 * genpd_syscore_switch - Switch power during system core suspend or resume.
1091 * @dev: Device that normally is marked as "always on" to switch power for.
1093 * This routine may only be called during the system core (syscore) suspend or
1094 * resume phase for devices whose "always on" flags are set.
1096 static void genpd_syscore_switch(struct device *dev, bool suspend)
1098 struct generic_pm_domain *genpd;
1100 genpd = dev_to_genpd(dev);
1101 if (!pm_genpd_present(genpd))
1105 genpd->suspended_count++;
1106 pm_genpd_sync_poweroff(genpd, false);
1108 pm_genpd_sync_poweron(genpd, false);
1109 genpd->suspended_count--;
1113 void pm_genpd_syscore_poweroff(struct device *dev)
1115 genpd_syscore_switch(dev, true);
1117 EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff);
1119 void pm_genpd_syscore_poweron(struct device *dev)
1121 genpd_syscore_switch(dev, false);
1123 EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron);
1125 #else /* !CONFIG_PM_SLEEP */
1127 #define pm_genpd_prepare NULL
1128 #define pm_genpd_suspend NULL
1129 #define pm_genpd_suspend_late NULL
1130 #define pm_genpd_suspend_noirq NULL
1131 #define pm_genpd_resume_early NULL
1132 #define pm_genpd_resume_noirq NULL
1133 #define pm_genpd_resume NULL
1134 #define pm_genpd_freeze NULL
1135 #define pm_genpd_freeze_late NULL
1136 #define pm_genpd_freeze_noirq NULL
1137 #define pm_genpd_thaw_early NULL
1138 #define pm_genpd_thaw_noirq NULL
1139 #define pm_genpd_thaw NULL
1140 #define pm_genpd_restore_noirq NULL
1141 #define pm_genpd_complete NULL
1143 #endif /* CONFIG_PM_SLEEP */
1145 static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev,
1146 struct generic_pm_domain *genpd,
1147 struct gpd_timing_data *td)
1149 struct generic_pm_domain_data *gpd_data;
1152 ret = dev_pm_get_subsys_data(dev);
1154 return ERR_PTR(ret);
1156 gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL);
1165 gpd_data->base.dev = dev;
1166 gpd_data->td.constraint_changed = true;
1167 gpd_data->td.effective_constraint_ns = -1;
1168 gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier;
1170 spin_lock_irq(&dev->power.lock);
1172 if (dev->power.subsys_data->domain_data) {
1177 dev->power.subsys_data->domain_data = &gpd_data->base;
1178 dev->pm_domain = &genpd->domain;
1180 spin_unlock_irq(&dev->power.lock);
1185 spin_unlock_irq(&dev->power.lock);
1188 dev_pm_put_subsys_data(dev);
1189 return ERR_PTR(ret);
1192 static void genpd_free_dev_data(struct device *dev,
1193 struct generic_pm_domain_data *gpd_data)
1195 spin_lock_irq(&dev->power.lock);
1197 dev->pm_domain = NULL;
1198 dev->power.subsys_data->domain_data = NULL;
1200 spin_unlock_irq(&dev->power.lock);
1203 dev_pm_put_subsys_data(dev);
1207 * __pm_genpd_add_device - Add a device to an I/O PM domain.
1208 * @genpd: PM domain to add the device to.
1209 * @dev: Device to be added.
1210 * @td: Set of PM QoS timing parameters to attach to the device.
1212 int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
1213 struct gpd_timing_data *td)
1215 struct generic_pm_domain_data *gpd_data;
1218 dev_dbg(dev, "%s()\n", __func__);
1220 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev))
1223 gpd_data = genpd_alloc_dev_data(dev, genpd, td);
1224 if (IS_ERR(gpd_data))
1225 return PTR_ERR(gpd_data);
1227 mutex_lock(&genpd->lock);
1229 if (genpd->prepared_count > 0) {
1234 ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0;
1238 genpd->device_count++;
1239 genpd->max_off_time_changed = true;
1241 list_add_tail(&gpd_data->base.list_node, &genpd->dev_list);
1244 mutex_unlock(&genpd->lock);
1247 genpd_free_dev_data(dev, gpd_data);
1249 dev_pm_qos_add_notifier(dev, &gpd_data->nb);
1255 * pm_genpd_remove_device - Remove a device from an I/O PM domain.
1256 * @genpd: PM domain to remove the device from.
1257 * @dev: Device to be removed.
1259 int pm_genpd_remove_device(struct generic_pm_domain *genpd,
1262 struct generic_pm_domain_data *gpd_data;
1263 struct pm_domain_data *pdd;
1266 dev_dbg(dev, "%s()\n", __func__);
1268 if (!genpd || genpd != pm_genpd_lookup_dev(dev))
1271 /* The above validation also means we have existing domain_data. */
1272 pdd = dev->power.subsys_data->domain_data;
1273 gpd_data = to_gpd_data(pdd);
1274 dev_pm_qos_remove_notifier(dev, &gpd_data->nb);
1276 mutex_lock(&genpd->lock);
1278 if (genpd->prepared_count > 0) {
1283 genpd->device_count--;
1284 genpd->max_off_time_changed = true;
1286 if (genpd->detach_dev)
1287 genpd->detach_dev(genpd, dev);
1289 list_del_init(&pdd->list_node);
1291 mutex_unlock(&genpd->lock);
1293 genpd_free_dev_data(dev, gpd_data);
1298 mutex_unlock(&genpd->lock);
1299 dev_pm_qos_add_notifier(dev, &gpd_data->nb);
1305 * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
1306 * @genpd: Master PM domain to add the subdomain to.
1307 * @subdomain: Subdomain to be added.
1309 int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
1310 struct generic_pm_domain *subdomain)
1312 struct gpd_link *link;
1315 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)
1316 || genpd == subdomain)
1319 mutex_lock(&genpd->lock);
1320 mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING);
1322 if (genpd->status == GPD_STATE_POWER_OFF
1323 && subdomain->status != GPD_STATE_POWER_OFF) {
1328 list_for_each_entry(link, &genpd->master_links, master_node) {
1329 if (link->slave == subdomain && link->master == genpd) {
1335 link = kzalloc(sizeof(*link), GFP_KERNEL);
1340 link->master = genpd;
1341 list_add_tail(&link->master_node, &genpd->master_links);
1342 link->slave = subdomain;
1343 list_add_tail(&link->slave_node, &subdomain->slave_links);
1344 if (subdomain->status != GPD_STATE_POWER_OFF)
1345 genpd_sd_counter_inc(genpd);
1348 mutex_unlock(&subdomain->lock);
1349 mutex_unlock(&genpd->lock);
1355 * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain.
1356 * @genpd: Master PM domain to remove the subdomain from.
1357 * @subdomain: Subdomain to be removed.
1359 int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
1360 struct generic_pm_domain *subdomain)
1362 struct gpd_link *link;
1365 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain))
1368 mutex_lock(&genpd->lock);
1370 if (!list_empty(&subdomain->slave_links) || subdomain->device_count) {
1371 pr_warn("%s: unable to remove subdomain %s\n", genpd->name,
1377 list_for_each_entry(link, &genpd->master_links, master_node) {
1378 if (link->slave != subdomain)
1381 mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING);
1383 list_del(&link->master_node);
1384 list_del(&link->slave_node);
1386 if (subdomain->status != GPD_STATE_POWER_OFF)
1387 genpd_sd_counter_dec(genpd);
1389 mutex_unlock(&subdomain->lock);
1396 mutex_unlock(&genpd->lock);
1401 /* Default device callbacks for generic PM domains. */
1404 * pm_genpd_default_save_state - Default "save device state" for PM domains.
1405 * @dev: Device to handle.
1407 static int pm_genpd_default_save_state(struct device *dev)
1409 int (*cb)(struct device *__dev);
1411 if (dev->type && dev->type->pm)
1412 cb = dev->type->pm->runtime_suspend;
1413 else if (dev->class && dev->class->pm)
1414 cb = dev->class->pm->runtime_suspend;
1415 else if (dev->bus && dev->bus->pm)
1416 cb = dev->bus->pm->runtime_suspend;
1420 if (!cb && dev->driver && dev->driver->pm)
1421 cb = dev->driver->pm->runtime_suspend;
1423 return cb ? cb(dev) : 0;
1427 * pm_genpd_default_restore_state - Default PM domains "restore device state".
1428 * @dev: Device to handle.
1430 static int pm_genpd_default_restore_state(struct device *dev)
1432 int (*cb)(struct device *__dev);
1434 if (dev->type && dev->type->pm)
1435 cb = dev->type->pm->runtime_resume;
1436 else if (dev->class && dev->class->pm)
1437 cb = dev->class->pm->runtime_resume;
1438 else if (dev->bus && dev->bus->pm)
1439 cb = dev->bus->pm->runtime_resume;
1443 if (!cb && dev->driver && dev->driver->pm)
1444 cb = dev->driver->pm->runtime_resume;
1446 return cb ? cb(dev) : 0;
1450 * pm_genpd_init - Initialize a generic I/O PM domain object.
1451 * @genpd: PM domain object to initialize.
1452 * @gov: PM domain governor to associate with the domain (may be NULL).
1453 * @is_off: Initial value of the domain's power_is_off field.
1455 void pm_genpd_init(struct generic_pm_domain *genpd,
1456 struct dev_power_governor *gov, bool is_off)
1458 if (IS_ERR_OR_NULL(genpd))
1461 INIT_LIST_HEAD(&genpd->master_links);
1462 INIT_LIST_HEAD(&genpd->slave_links);
1463 INIT_LIST_HEAD(&genpd->dev_list);
1464 mutex_init(&genpd->lock);
1466 INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn);
1467 atomic_set(&genpd->sd_count, 0);
1468 genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE;
1469 genpd->device_count = 0;
1470 genpd->max_off_time_ns = -1;
1471 genpd->max_off_time_changed = true;
1472 genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend;
1473 genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume;
1474 genpd->domain.ops.prepare = pm_genpd_prepare;
1475 genpd->domain.ops.suspend = pm_genpd_suspend;
1476 genpd->domain.ops.suspend_late = pm_genpd_suspend_late;
1477 genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq;
1478 genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq;
1479 genpd->domain.ops.resume_early = pm_genpd_resume_early;
1480 genpd->domain.ops.resume = pm_genpd_resume;
1481 genpd->domain.ops.freeze = pm_genpd_freeze;
1482 genpd->domain.ops.freeze_late = pm_genpd_freeze_late;
1483 genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq;
1484 genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq;
1485 genpd->domain.ops.thaw_early = pm_genpd_thaw_early;
1486 genpd->domain.ops.thaw = pm_genpd_thaw;
1487 genpd->domain.ops.poweroff = pm_genpd_suspend;
1488 genpd->domain.ops.poweroff_late = pm_genpd_suspend_late;
1489 genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq;
1490 genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq;
1491 genpd->domain.ops.restore_early = pm_genpd_resume_early;
1492 genpd->domain.ops.restore = pm_genpd_resume;
1493 genpd->domain.ops.complete = pm_genpd_complete;
1494 genpd->dev_ops.save_state = pm_genpd_default_save_state;
1495 genpd->dev_ops.restore_state = pm_genpd_default_restore_state;
1497 if (genpd->flags & GENPD_FLAG_PM_CLK) {
1498 genpd->dev_ops.stop = pm_clk_suspend;
1499 genpd->dev_ops.start = pm_clk_resume;
1502 mutex_lock(&gpd_list_lock);
1503 list_add(&genpd->gpd_list_node, &gpd_list);
1504 mutex_unlock(&gpd_list_lock);
1506 EXPORT_SYMBOL_GPL(pm_genpd_init);
1508 #ifdef CONFIG_PM_GENERIC_DOMAINS_OF
1510 * Device Tree based PM domain providers.
1512 * The code below implements generic device tree based PM domain providers that
1513 * bind device tree nodes with generic PM domains registered in the system.
1515 * Any driver that registers generic PM domains and needs to support binding of
1516 * devices to these domains is supposed to register a PM domain provider, which
1517 * maps a PM domain specifier retrieved from the device tree to a PM domain.
1519 * Two simple mapping functions have been provided for convenience:
1520 * - __of_genpd_xlate_simple() for 1:1 device tree node to PM domain mapping.
1521 * - __of_genpd_xlate_onecell() for mapping of multiple PM domains per node by
1526 * struct of_genpd_provider - PM domain provider registration structure
1527 * @link: Entry in global list of PM domain providers
1528 * @node: Pointer to device tree node of PM domain provider
1529 * @xlate: Provider-specific xlate callback mapping a set of specifier cells
1531 * @data: context pointer to be passed into @xlate callback
1533 struct of_genpd_provider {
1534 struct list_head link;
1535 struct device_node *node;
1536 genpd_xlate_t xlate;
1540 /* List of registered PM domain providers. */
1541 static LIST_HEAD(of_genpd_providers);
1542 /* Mutex to protect the list above. */
1543 static DEFINE_MUTEX(of_genpd_mutex);
1546 * __of_genpd_xlate_simple() - Xlate function for direct node-domain mapping
1547 * @genpdspec: OF phandle args to map into a PM domain
1548 * @data: xlate function private data - pointer to struct generic_pm_domain
1550 * This is a generic xlate function that can be used to model PM domains that
1551 * have their own device tree nodes. The private data of xlate function needs
1552 * to be a valid pointer to struct generic_pm_domain.
1554 struct generic_pm_domain *__of_genpd_xlate_simple(
1555 struct of_phandle_args *genpdspec,
1558 if (genpdspec->args_count != 0)
1559 return ERR_PTR(-EINVAL);
1562 EXPORT_SYMBOL_GPL(__of_genpd_xlate_simple);
1565 * __of_genpd_xlate_onecell() - Xlate function using a single index.
1566 * @genpdspec: OF phandle args to map into a PM domain
1567 * @data: xlate function private data - pointer to struct genpd_onecell_data
1569 * This is a generic xlate function that can be used to model simple PM domain
1570 * controllers that have one device tree node and provide multiple PM domains.
1571 * A single cell is used as an index into an array of PM domains specified in
1572 * the genpd_onecell_data struct when registering the provider.
1574 struct generic_pm_domain *__of_genpd_xlate_onecell(
1575 struct of_phandle_args *genpdspec,
1578 struct genpd_onecell_data *genpd_data = data;
1579 unsigned int idx = genpdspec->args[0];
1581 if (genpdspec->args_count != 1)
1582 return ERR_PTR(-EINVAL);
1584 if (idx >= genpd_data->num_domains) {
1585 pr_err("%s: invalid domain index %u\n", __func__, idx);
1586 return ERR_PTR(-EINVAL);
1589 if (!genpd_data->domains[idx])
1590 return ERR_PTR(-ENOENT);
1592 return genpd_data->domains[idx];
1594 EXPORT_SYMBOL_GPL(__of_genpd_xlate_onecell);
1597 * __of_genpd_add_provider() - Register a PM domain provider for a node
1598 * @np: Device node pointer associated with the PM domain provider.
1599 * @xlate: Callback for decoding PM domain from phandle arguments.
1600 * @data: Context pointer for @xlate callback.
1602 int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
1605 struct of_genpd_provider *cp;
1607 cp = kzalloc(sizeof(*cp), GFP_KERNEL);
1611 cp->node = of_node_get(np);
1615 mutex_lock(&of_genpd_mutex);
1616 list_add(&cp->link, &of_genpd_providers);
1617 mutex_unlock(&of_genpd_mutex);
1618 pr_debug("Added domain provider from %s\n", np->full_name);
1622 EXPORT_SYMBOL_GPL(__of_genpd_add_provider);
1625 * of_genpd_del_provider() - Remove a previously registered PM domain provider
1626 * @np: Device node pointer associated with the PM domain provider
1628 void of_genpd_del_provider(struct device_node *np)
1630 struct of_genpd_provider *cp;
1632 mutex_lock(&of_genpd_mutex);
1633 list_for_each_entry(cp, &of_genpd_providers, link) {
1634 if (cp->node == np) {
1635 list_del(&cp->link);
1636 of_node_put(cp->node);
1641 mutex_unlock(&of_genpd_mutex);
1643 EXPORT_SYMBOL_GPL(of_genpd_del_provider);
1646 * of_genpd_get_from_provider() - Look-up PM domain
1647 * @genpdspec: OF phandle args to use for look-up
1649 * Looks for a PM domain provider under the node specified by @genpdspec and if
1650 * found, uses xlate function of the provider to map phandle args to a PM
1653 * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR()
1656 struct generic_pm_domain *of_genpd_get_from_provider(
1657 struct of_phandle_args *genpdspec)
1659 struct generic_pm_domain *genpd = ERR_PTR(-ENOENT);
1660 struct of_genpd_provider *provider;
1662 mutex_lock(&of_genpd_mutex);
1664 /* Check if we have such a provider in our array */
1665 list_for_each_entry(provider, &of_genpd_providers, link) {
1666 if (provider->node == genpdspec->np)
1667 genpd = provider->xlate(genpdspec, provider->data);
1672 mutex_unlock(&of_genpd_mutex);
1676 EXPORT_SYMBOL_GPL(of_genpd_get_from_provider);
1679 * genpd_dev_pm_detach - Detach a device from its PM domain.
1680 * @dev: Device to detach.
1681 * @power_off: Currently not used
1683 * Try to locate a corresponding generic PM domain, which the device was
1684 * attached to previously. If such is found, the device is detached from it.
1686 static void genpd_dev_pm_detach(struct device *dev, bool power_off)
1688 struct generic_pm_domain *pd;
1692 pd = pm_genpd_lookup_dev(dev);
1696 dev_dbg(dev, "removing from PM domain %s\n", pd->name);
1698 for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) {
1699 ret = pm_genpd_remove_device(pd, dev);
1708 dev_err(dev, "failed to remove from PM domain %s: %d",
1713 /* Check if PM domain can be powered off after removing this device. */
1714 genpd_queue_power_off_work(pd);
1717 static void genpd_dev_pm_sync(struct device *dev)
1719 struct generic_pm_domain *pd;
1721 pd = dev_to_genpd(dev);
1725 genpd_queue_power_off_work(pd);
1729 * genpd_dev_pm_attach - Attach a device to its PM domain using DT.
1730 * @dev: Device to attach.
1732 * Parse device's OF node to find a PM domain specifier. If such is found,
1733 * attaches the device to retrieved pm_domain ops.
1735 * Both generic and legacy Samsung-specific DT bindings are supported to keep
1736 * backwards compatibility with existing DTBs.
1738 * Returns 0 on successfully attached PM domain or negative error code. Note
1739 * that if a power-domain exists for the device, but it cannot be found or
1740 * turned on, then return -EPROBE_DEFER to ensure that the device is not
1741 * probed and to re-try again later.
1743 int genpd_dev_pm_attach(struct device *dev)
1745 struct of_phandle_args pd_args;
1746 struct generic_pm_domain *pd;
1756 ret = of_parse_phandle_with_args(dev->of_node, "power-domains",
1757 "#power-domain-cells", 0, &pd_args);
1763 * Try legacy Samsung-specific bindings
1764 * (for backwards compatibility of DT ABI)
1766 pd_args.args_count = 0;
1767 pd_args.np = of_parse_phandle(dev->of_node,
1768 "samsung,power-domain", 0);
1773 pd = of_genpd_get_from_provider(&pd_args);
1775 dev_dbg(dev, "%s() failed to find PM domain: %ld\n",
1776 __func__, PTR_ERR(pd));
1777 of_node_put(dev->of_node);
1778 return -EPROBE_DEFER;
1781 dev_dbg(dev, "adding to PM domain %s\n", pd->name);
1783 for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) {
1784 ret = pm_genpd_add_device(pd, dev);
1793 dev_err(dev, "failed to add to PM domain %s: %d",
1795 of_node_put(dev->of_node);
1799 dev->pm_domain->detach = genpd_dev_pm_detach;
1800 dev->pm_domain->sync = genpd_dev_pm_sync;
1801 ret = genpd_poweron(pd);
1804 return ret ? -EPROBE_DEFER : 0;
1806 EXPORT_SYMBOL_GPL(genpd_dev_pm_attach);
1807 #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
1810 /*** debugfs support ***/
1812 #ifdef CONFIG_PM_ADVANCED_DEBUG
1813 #include <linux/pm.h>
1814 #include <linux/device.h>
1815 #include <linux/debugfs.h>
1816 #include <linux/seq_file.h>
1817 #include <linux/init.h>
1818 #include <linux/kobject.h>
1819 static struct dentry *pm_genpd_debugfs_dir;
1822 * TODO: This function is a slightly modified version of rtpm_status_show
1823 * from sysfs.c, so generalize it.
1825 static void rtpm_status_str(struct seq_file *s, struct device *dev)
1827 static const char * const status_lookup[] = {
1828 [RPM_ACTIVE] = "active",
1829 [RPM_RESUMING] = "resuming",
1830 [RPM_SUSPENDED] = "suspended",
1831 [RPM_SUSPENDING] = "suspending"
1835 if (dev->power.runtime_error)
1837 else if (dev->power.disable_depth)
1839 else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup))
1840 p = status_lookup[dev->power.runtime_status];
1847 static int pm_genpd_summary_one(struct seq_file *s,
1848 struct generic_pm_domain *genpd)
1850 static const char * const status_lookup[] = {
1851 [GPD_STATE_ACTIVE] = "on",
1852 [GPD_STATE_POWER_OFF] = "off"
1854 struct pm_domain_data *pm_data;
1855 const char *kobj_path;
1856 struct gpd_link *link;
1859 ret = mutex_lock_interruptible(&genpd->lock);
1861 return -ERESTARTSYS;
1863 if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup)))
1865 seq_printf(s, "%-30s %-15s ", genpd->name, status_lookup[genpd->status]);
1868 * Modifications on the list require holding locks on both
1869 * master and slave, so we are safe.
1870 * Also genpd->name is immutable.
1872 list_for_each_entry(link, &genpd->master_links, master_node) {
1873 seq_printf(s, "%s", link->slave->name);
1874 if (!list_is_last(&link->master_node, &genpd->master_links))
1878 list_for_each_entry(pm_data, &genpd->dev_list, list_node) {
1879 kobj_path = kobject_get_path(&pm_data->dev->kobj, GFP_KERNEL);
1880 if (kobj_path == NULL)
1883 seq_printf(s, "\n %-50s ", kobj_path);
1884 rtpm_status_str(s, pm_data->dev);
1890 mutex_unlock(&genpd->lock);
1895 static int pm_genpd_summary_show(struct seq_file *s, void *data)
1897 struct generic_pm_domain *genpd;
1900 seq_puts(s, "domain status slaves\n");
1901 seq_puts(s, " /device runtime status\n");
1902 seq_puts(s, "----------------------------------------------------------------------\n");
1904 ret = mutex_lock_interruptible(&gpd_list_lock);
1906 return -ERESTARTSYS;
1908 list_for_each_entry(genpd, &gpd_list, gpd_list_node) {
1909 ret = pm_genpd_summary_one(s, genpd);
1913 mutex_unlock(&gpd_list_lock);
1918 static int pm_genpd_summary_open(struct inode *inode, struct file *file)
1920 return single_open(file, pm_genpd_summary_show, NULL);
1923 static const struct file_operations pm_genpd_summary_fops = {
1924 .open = pm_genpd_summary_open,
1926 .llseek = seq_lseek,
1927 .release = single_release,
1930 static int __init pm_genpd_debug_init(void)
1934 pm_genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL);
1936 if (!pm_genpd_debugfs_dir)
1939 d = debugfs_create_file("pm_genpd_summary", S_IRUGO,
1940 pm_genpd_debugfs_dir, NULL, &pm_genpd_summary_fops);
1946 late_initcall(pm_genpd_debug_init);
1948 static void __exit pm_genpd_debug_exit(void)
1950 debugfs_remove_recursive(pm_genpd_debugfs_dir);
1952 __exitcall(pm_genpd_debug_exit);
1953 #endif /* CONFIG_PM_ADVANCED_DEBUG */