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)
95 return GENPD_DEV_TIMED_CALLBACK(genpd, int, stop, dev,
96 stop_latency_ns, "stop");
99 static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev,
103 return GENPD_DEV_CALLBACK(genpd, int, start, dev);
105 return GENPD_DEV_TIMED_CALLBACK(genpd, int, start, dev,
106 start_latency_ns, "start");
109 static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd)
113 if (!WARN_ON(atomic_read(&genpd->sd_count) == 0))
114 ret = !!atomic_dec_and_test(&genpd->sd_count);
119 static void genpd_sd_counter_inc(struct generic_pm_domain *genpd)
121 atomic_inc(&genpd->sd_count);
122 smp_mb__after_atomic();
125 static int genpd_power_on(struct generic_pm_domain *genpd, bool timed)
131 if (!genpd->power_on)
135 return genpd->power_on(genpd);
137 time_start = ktime_get();
138 ret = genpd->power_on(genpd);
142 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
143 if (elapsed_ns <= genpd->power_on_latency_ns)
146 genpd->power_on_latency_ns = elapsed_ns;
147 genpd->max_off_time_changed = true;
148 pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
149 genpd->name, "on", elapsed_ns);
154 static int genpd_power_off(struct generic_pm_domain *genpd, bool timed)
160 if (!genpd->power_off)
164 return genpd->power_off(genpd);
166 time_start = ktime_get();
167 ret = genpd->power_off(genpd);
171 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
172 if (elapsed_ns <= genpd->power_off_latency_ns)
175 genpd->power_off_latency_ns = elapsed_ns;
176 genpd->max_off_time_changed = true;
177 pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
178 genpd->name, "off", elapsed_ns);
184 * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff().
185 * @genpd: PM domait to power off.
187 * Queue up the execution of pm_genpd_poweroff() unless it's already been done
190 static void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
192 queue_work(pm_wq, &genpd->power_off_work);
196 * __pm_genpd_poweron - Restore power to a given PM domain and its masters.
197 * @genpd: PM domain to power up.
199 * Restore power to @genpd and all of its masters so that it is possible to
200 * resume a device belonging to it.
202 static int __pm_genpd_poweron(struct generic_pm_domain *genpd)
204 struct gpd_link *link;
207 if (genpd->status == GPD_STATE_ACTIVE
208 || (genpd->prepared_count > 0 && genpd->suspend_power_off))
212 * The list is guaranteed not to change while the loop below is being
213 * executed, unless one of the masters' .power_on() callbacks fiddles
216 list_for_each_entry(link, &genpd->slave_links, slave_node) {
217 genpd_sd_counter_inc(link->master);
219 ret = pm_genpd_poweron(link->master);
221 genpd_sd_counter_dec(link->master);
226 ret = genpd_power_on(genpd, true);
230 genpd->status = GPD_STATE_ACTIVE;
234 list_for_each_entry_continue_reverse(link,
237 genpd_sd_counter_dec(link->master);
238 genpd_queue_power_off_work(link->master);
245 * pm_genpd_poweron - Restore power to a given PM domain and its masters.
246 * @genpd: PM domain to power up.
248 int pm_genpd_poweron(struct generic_pm_domain *genpd)
252 mutex_lock(&genpd->lock);
253 ret = __pm_genpd_poweron(genpd);
254 mutex_unlock(&genpd->lock);
258 static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev)
260 return GENPD_DEV_TIMED_CALLBACK(genpd, int, save_state, dev,
261 save_state_latency_ns, "state save");
264 static int genpd_restore_dev(struct generic_pm_domain *genpd,
265 struct device *dev, bool timed)
268 return GENPD_DEV_CALLBACK(genpd, int, restore_state, dev);
270 return GENPD_DEV_TIMED_CALLBACK(genpd, int, restore_state, dev,
271 restore_state_latency_ns,
275 static int genpd_dev_pm_qos_notifier(struct notifier_block *nb,
276 unsigned long val, void *ptr)
278 struct generic_pm_domain_data *gpd_data;
281 gpd_data = container_of(nb, struct generic_pm_domain_data, nb);
282 dev = gpd_data->base.dev;
285 struct generic_pm_domain *genpd;
286 struct pm_domain_data *pdd;
288 spin_lock_irq(&dev->power.lock);
290 pdd = dev->power.subsys_data ?
291 dev->power.subsys_data->domain_data : NULL;
292 if (pdd && pdd->dev) {
293 to_gpd_data(pdd)->td.constraint_changed = true;
294 genpd = dev_to_genpd(dev);
296 genpd = ERR_PTR(-ENODATA);
299 spin_unlock_irq(&dev->power.lock);
301 if (!IS_ERR(genpd)) {
302 mutex_lock(&genpd->lock);
303 genpd->max_off_time_changed = true;
304 mutex_unlock(&genpd->lock);
308 if (!dev || dev->power.ignore_children)
316 * pm_genpd_poweroff - Remove power from a given PM domain.
317 * @genpd: PM domain to power down.
318 * @is_async: PM domain is powered down from a scheduled work
320 * If all of the @genpd's devices have been suspended and all of its subdomains
321 * have been powered down, remove power from @genpd.
323 static int pm_genpd_poweroff(struct generic_pm_domain *genpd, bool is_async)
325 struct pm_domain_data *pdd;
326 struct gpd_link *link;
327 unsigned int not_suspended = 0;
330 * Do not try to power off the domain in the following situations:
331 * (1) The domain is already in the "power off" state.
332 * (2) System suspend is in progress.
334 if (genpd->status == GPD_STATE_POWER_OFF
335 || genpd->prepared_count > 0)
338 if (atomic_read(&genpd->sd_count) > 0)
341 list_for_each_entry(pdd, &genpd->dev_list, list_node) {
342 enum pm_qos_flags_status stat;
344 stat = dev_pm_qos_flags(pdd->dev,
345 PM_QOS_FLAG_NO_POWER_OFF
346 | PM_QOS_FLAG_REMOTE_WAKEUP);
347 if (stat > PM_QOS_FLAGS_NONE)
350 if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev)
351 || pdd->dev->power.irq_safe))
355 if (not_suspended > 1 || (not_suspended == 1 && is_async))
358 if (genpd->gov && genpd->gov->power_down_ok) {
359 if (!genpd->gov->power_down_ok(&genpd->domain))
363 if (genpd->power_off) {
366 if (atomic_read(&genpd->sd_count) > 0)
370 * If sd_count > 0 at this point, one of the subdomains hasn't
371 * managed to call pm_genpd_poweron() for the master yet after
372 * incrementing it. In that case pm_genpd_poweron() will wait
373 * for us to drop the lock, so we can call .power_off() and let
374 * the pm_genpd_poweron() restore power for us (this shouldn't
375 * happen very often).
377 ret = genpd_power_off(genpd, true);
382 genpd->status = GPD_STATE_POWER_OFF;
384 list_for_each_entry(link, &genpd->slave_links, slave_node) {
385 genpd_sd_counter_dec(link->master);
386 genpd_queue_power_off_work(link->master);
393 * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0.
394 * @work: Work structure used for scheduling the execution of this function.
396 static void genpd_power_off_work_fn(struct work_struct *work)
398 struct generic_pm_domain *genpd;
400 genpd = container_of(work, struct generic_pm_domain, power_off_work);
402 mutex_lock(&genpd->lock);
403 pm_genpd_poweroff(genpd, true);
404 mutex_unlock(&genpd->lock);
408 * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain.
409 * @dev: Device to suspend.
411 * Carry out a runtime suspend of a device under the assumption that its
412 * pm_domain field points to the domain member of an object of type
413 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
415 static int pm_genpd_runtime_suspend(struct device *dev)
417 struct generic_pm_domain *genpd;
418 bool (*stop_ok)(struct device *__dev);
421 dev_dbg(dev, "%s()\n", __func__);
423 genpd = dev_to_genpd(dev);
427 stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL;
428 if (stop_ok && !stop_ok(dev))
431 ret = genpd_save_dev(genpd, dev);
435 ret = genpd_stop_dev(genpd, dev);
437 genpd_restore_dev(genpd, dev, true);
442 * If power.irq_safe is set, this routine will be run with interrupts
443 * off, so it can't use mutexes.
445 if (dev->power.irq_safe)
448 mutex_lock(&genpd->lock);
449 pm_genpd_poweroff(genpd, false);
450 mutex_unlock(&genpd->lock);
456 * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain.
457 * @dev: Device to resume.
459 * Carry out a runtime resume of a device under the assumption that its
460 * pm_domain field points to the domain member of an object of type
461 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
463 static int pm_genpd_runtime_resume(struct device *dev)
465 struct generic_pm_domain *genpd;
469 dev_dbg(dev, "%s()\n", __func__);
471 genpd = dev_to_genpd(dev);
475 /* If power.irq_safe, the PM domain is never powered off. */
476 if (dev->power.irq_safe) {
481 mutex_lock(&genpd->lock);
482 ret = __pm_genpd_poweron(genpd);
483 mutex_unlock(&genpd->lock);
489 genpd_start_dev(genpd, dev, timed);
490 genpd_restore_dev(genpd, dev, timed);
495 static bool pd_ignore_unused;
496 static int __init pd_ignore_unused_setup(char *__unused)
498 pd_ignore_unused = true;
501 __setup("pd_ignore_unused", pd_ignore_unused_setup);
504 * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use.
506 void pm_genpd_poweroff_unused(void)
508 struct generic_pm_domain *genpd;
510 if (pd_ignore_unused) {
511 pr_warn("genpd: Not disabling unused power domains\n");
515 mutex_lock(&gpd_list_lock);
517 list_for_each_entry(genpd, &gpd_list, gpd_list_node)
518 genpd_queue_power_off_work(genpd);
520 mutex_unlock(&gpd_list_lock);
523 static int __init genpd_poweroff_unused(void)
525 pm_genpd_poweroff_unused();
528 late_initcall(genpd_poweroff_unused);
530 #ifdef CONFIG_PM_SLEEP
533 * pm_genpd_present - Check if the given PM domain has been initialized.
534 * @genpd: PM domain to check.
536 static bool pm_genpd_present(const struct generic_pm_domain *genpd)
538 const struct generic_pm_domain *gpd;
540 if (IS_ERR_OR_NULL(genpd))
543 list_for_each_entry(gpd, &gpd_list, gpd_list_node)
550 static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd,
553 return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev);
557 * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters.
558 * @genpd: PM domain to power off, if possible.
559 * @timed: True if latency measurements are allowed.
561 * Check if the given PM domain can be powered off (during system suspend or
562 * hibernation) and do that if so. Also, in that case propagate to its masters.
564 * This function is only called in "noirq" and "syscore" stages of system power
565 * transitions, so it need not acquire locks (all of the "noirq" callbacks are
566 * executed sequentially, so it is guaranteed that it will never run twice in
569 static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd,
572 struct gpd_link *link;
574 if (genpd->status == GPD_STATE_POWER_OFF)
577 if (genpd->suspended_count != genpd->device_count
578 || atomic_read(&genpd->sd_count) > 0)
581 genpd_power_off(genpd, timed);
583 genpd->status = GPD_STATE_POWER_OFF;
585 list_for_each_entry(link, &genpd->slave_links, slave_node) {
586 genpd_sd_counter_dec(link->master);
587 pm_genpd_sync_poweroff(link->master, timed);
592 * pm_genpd_sync_poweron - Synchronously power on a PM domain and its masters.
593 * @genpd: PM domain to power on.
594 * @timed: True if latency measurements are allowed.
596 * This function is only called in "noirq" and "syscore" stages of system power
597 * transitions, so it need not acquire locks (all of the "noirq" callbacks are
598 * executed sequentially, so it is guaranteed that it will never run twice in
601 static void pm_genpd_sync_poweron(struct generic_pm_domain *genpd,
604 struct gpd_link *link;
606 if (genpd->status == GPD_STATE_ACTIVE)
609 list_for_each_entry(link, &genpd->slave_links, slave_node) {
610 pm_genpd_sync_poweron(link->master, timed);
611 genpd_sd_counter_inc(link->master);
614 genpd_power_on(genpd, timed);
616 genpd->status = GPD_STATE_ACTIVE;
620 * resume_needed - Check whether to resume a device before system suspend.
621 * @dev: Device to check.
622 * @genpd: PM domain the device belongs to.
624 * There are two cases in which a device that can wake up the system from sleep
625 * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled
626 * to wake up the system and it has to remain active for this purpose while the
627 * system is in the sleep state and (2) if the device is not enabled to wake up
628 * the system from sleep states and it generally doesn't generate wakeup signals
629 * by itself (those signals are generated on its behalf by other parts of the
630 * system). In the latter case it may be necessary to reconfigure the device's
631 * wakeup settings during system suspend, because it may have been set up to
632 * signal remote wakeup from the system's working state as needed by runtime PM.
633 * Return 'true' in either of the above cases.
635 static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd)
639 if (!device_can_wakeup(dev))
642 active_wakeup = genpd_dev_active_wakeup(genpd, dev);
643 return device_may_wakeup(dev) ? active_wakeup : !active_wakeup;
647 * pm_genpd_prepare - Start power transition of a device in a PM domain.
648 * @dev: Device to start the transition of.
650 * Start a power transition of a device (during a system-wide power transition)
651 * under the assumption that its pm_domain field points to the domain member of
652 * an object of type struct generic_pm_domain representing a PM domain
653 * consisting of I/O devices.
655 static int pm_genpd_prepare(struct device *dev)
657 struct generic_pm_domain *genpd;
660 dev_dbg(dev, "%s()\n", __func__);
662 genpd = dev_to_genpd(dev);
667 * If a wakeup request is pending for the device, it should be woken up
668 * at this point and a system wakeup event should be reported if it's
669 * set up to wake up the system from sleep states.
671 pm_runtime_get_noresume(dev);
672 if (pm_runtime_barrier(dev) && device_may_wakeup(dev))
673 pm_wakeup_event(dev, 0);
675 if (pm_wakeup_pending()) {
680 if (resume_needed(dev, genpd))
681 pm_runtime_resume(dev);
683 mutex_lock(&genpd->lock);
685 if (genpd->prepared_count++ == 0) {
686 genpd->suspended_count = 0;
687 genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF;
690 mutex_unlock(&genpd->lock);
692 if (genpd->suspend_power_off) {
693 pm_runtime_put_noidle(dev);
698 * The PM domain must be in the GPD_STATE_ACTIVE state at this point,
699 * so pm_genpd_poweron() will return immediately, but if the device
700 * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need
701 * to make it operational.
703 pm_runtime_resume(dev);
704 __pm_runtime_disable(dev, false);
706 ret = pm_generic_prepare(dev);
708 mutex_lock(&genpd->lock);
710 if (--genpd->prepared_count == 0)
711 genpd->suspend_power_off = false;
713 mutex_unlock(&genpd->lock);
714 pm_runtime_enable(dev);
722 * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain.
723 * @dev: Device to suspend.
725 * Suspend a device under the assumption that its pm_domain field points to the
726 * domain member of an object of type struct generic_pm_domain representing
727 * a PM domain consisting of I/O devices.
729 static int pm_genpd_suspend(struct device *dev)
731 struct generic_pm_domain *genpd;
733 dev_dbg(dev, "%s()\n", __func__);
735 genpd = dev_to_genpd(dev);
739 return genpd->suspend_power_off ? 0 : pm_generic_suspend(dev);
743 * pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain.
744 * @dev: Device to suspend.
746 * Carry out a late suspend of a device under the assumption that its
747 * pm_domain field points to the domain member of an object of type
748 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
750 static int pm_genpd_suspend_late(struct device *dev)
752 struct generic_pm_domain *genpd;
754 dev_dbg(dev, "%s()\n", __func__);
756 genpd = dev_to_genpd(dev);
760 return genpd->suspend_power_off ? 0 : pm_generic_suspend_late(dev);
764 * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain.
765 * @dev: Device to suspend.
767 * Stop the device and remove power from the domain if all devices in it have
770 static int pm_genpd_suspend_noirq(struct device *dev)
772 struct generic_pm_domain *genpd;
774 dev_dbg(dev, "%s()\n", __func__);
776 genpd = dev_to_genpd(dev);
780 if (genpd->suspend_power_off
781 || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)))
784 genpd_stop_dev(genpd, dev);
787 * Since all of the "noirq" callbacks are executed sequentially, it is
788 * guaranteed that this function will never run twice in parallel for
789 * the same PM domain, so it is not necessary to use locking here.
791 genpd->suspended_count++;
792 pm_genpd_sync_poweroff(genpd, true);
798 * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain.
799 * @dev: Device to resume.
801 * Restore power to the device's PM domain, if necessary, and start the device.
803 static int pm_genpd_resume_noirq(struct device *dev)
805 struct generic_pm_domain *genpd;
807 dev_dbg(dev, "%s()\n", __func__);
809 genpd = dev_to_genpd(dev);
813 if (genpd->suspend_power_off
814 || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)))
818 * Since all of the "noirq" callbacks are executed sequentially, it is
819 * guaranteed that this function will never run twice in parallel for
820 * the same PM domain, so it is not necessary to use locking here.
822 pm_genpd_sync_poweron(genpd, true);
823 genpd->suspended_count--;
825 return genpd_start_dev(genpd, dev, true);
829 * pm_genpd_resume_early - Early resume of a device in an I/O PM domain.
830 * @dev: Device to resume.
832 * Carry out an early resume of a device under the assumption that its
833 * pm_domain field points to the domain member of an object of type
834 * struct generic_pm_domain representing a power domain consisting of I/O
837 static int pm_genpd_resume_early(struct device *dev)
839 struct generic_pm_domain *genpd;
841 dev_dbg(dev, "%s()\n", __func__);
843 genpd = dev_to_genpd(dev);
847 return genpd->suspend_power_off ? 0 : pm_generic_resume_early(dev);
851 * pm_genpd_resume - Resume of device in an I/O PM domain.
852 * @dev: Device to resume.
854 * Resume a device under the assumption that its pm_domain field points to the
855 * domain member of an object of type struct generic_pm_domain representing
856 * a power domain consisting of I/O devices.
858 static int pm_genpd_resume(struct device *dev)
860 struct generic_pm_domain *genpd;
862 dev_dbg(dev, "%s()\n", __func__);
864 genpd = dev_to_genpd(dev);
868 return genpd->suspend_power_off ? 0 : pm_generic_resume(dev);
872 * pm_genpd_freeze - Freezing a device in an I/O PM domain.
873 * @dev: Device to freeze.
875 * Freeze a device under the assumption that its pm_domain field points to the
876 * domain member of an object of type struct generic_pm_domain representing
877 * a power domain consisting of I/O devices.
879 static int pm_genpd_freeze(struct device *dev)
881 struct generic_pm_domain *genpd;
883 dev_dbg(dev, "%s()\n", __func__);
885 genpd = dev_to_genpd(dev);
889 return genpd->suspend_power_off ? 0 : pm_generic_freeze(dev);
893 * pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain.
894 * @dev: Device to freeze.
896 * Carry out a late freeze of a device under the assumption that its
897 * pm_domain field points to the domain member of an object of type
898 * struct generic_pm_domain representing a power domain consisting of I/O
901 static int pm_genpd_freeze_late(struct device *dev)
903 struct generic_pm_domain *genpd;
905 dev_dbg(dev, "%s()\n", __func__);
907 genpd = dev_to_genpd(dev);
911 return genpd->suspend_power_off ? 0 : pm_generic_freeze_late(dev);
915 * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain.
916 * @dev: Device to freeze.
918 * Carry out a late freeze of a device under the assumption that its
919 * pm_domain field points to the domain member of an object of type
920 * struct generic_pm_domain representing a power domain consisting of I/O
923 static int pm_genpd_freeze_noirq(struct device *dev)
925 struct generic_pm_domain *genpd;
927 dev_dbg(dev, "%s()\n", __func__);
929 genpd = dev_to_genpd(dev);
933 return genpd->suspend_power_off ? 0 : genpd_stop_dev(genpd, dev);
937 * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain.
938 * @dev: Device to thaw.
940 * Start the device, unless power has been removed from the domain already
941 * before the system transition.
943 static int pm_genpd_thaw_noirq(struct device *dev)
945 struct generic_pm_domain *genpd;
947 dev_dbg(dev, "%s()\n", __func__);
949 genpd = dev_to_genpd(dev);
953 return genpd->suspend_power_off ? 0 : genpd_start_dev(genpd, dev, true);
957 * pm_genpd_thaw_early - Early thaw of device in an I/O PM domain.
958 * @dev: Device to thaw.
960 * Carry out an early thaw of a device under the assumption that its
961 * pm_domain field points to the domain member of an object of type
962 * struct generic_pm_domain representing a power domain consisting of I/O
965 static int pm_genpd_thaw_early(struct device *dev)
967 struct generic_pm_domain *genpd;
969 dev_dbg(dev, "%s()\n", __func__);
971 genpd = dev_to_genpd(dev);
975 return genpd->suspend_power_off ? 0 : pm_generic_thaw_early(dev);
979 * pm_genpd_thaw - Thaw a device belonging to an I/O power domain.
980 * @dev: Device to thaw.
982 * Thaw a device under the assumption that its pm_domain field points to the
983 * domain member of an object of type struct generic_pm_domain representing
984 * a power domain consisting of I/O devices.
986 static int pm_genpd_thaw(struct device *dev)
988 struct generic_pm_domain *genpd;
990 dev_dbg(dev, "%s()\n", __func__);
992 genpd = dev_to_genpd(dev);
996 return genpd->suspend_power_off ? 0 : pm_generic_thaw(dev);
1000 * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain.
1001 * @dev: Device to resume.
1003 * Make sure the domain will be in the same power state as before the
1004 * hibernation the system is resuming from and start the device if necessary.
1006 static int pm_genpd_restore_noirq(struct device *dev)
1008 struct generic_pm_domain *genpd;
1010 dev_dbg(dev, "%s()\n", __func__);
1012 genpd = dev_to_genpd(dev);
1017 * Since all of the "noirq" callbacks are executed sequentially, it is
1018 * guaranteed that this function will never run twice in parallel for
1019 * the same PM domain, so it is not necessary to use locking here.
1021 * At this point suspended_count == 0 means we are being run for the
1022 * first time for the given domain in the present cycle.
1024 if (genpd->suspended_count++ == 0) {
1026 * The boot kernel might put the domain into arbitrary state,
1027 * so make it appear as powered off to pm_genpd_sync_poweron(),
1028 * so that it tries to power it on in case it was really off.
1030 genpd->status = GPD_STATE_POWER_OFF;
1031 if (genpd->suspend_power_off) {
1033 * If the domain was off before the hibernation, make
1034 * sure it will be off going forward.
1036 genpd_power_off(genpd, true);
1042 if (genpd->suspend_power_off)
1045 pm_genpd_sync_poweron(genpd, true);
1047 return genpd_start_dev(genpd, dev, true);
1051 * pm_genpd_complete - Complete power transition of a device in a power domain.
1052 * @dev: Device to complete the transition of.
1054 * Complete a power transition of a device (during a system-wide power
1055 * transition) under the assumption that its pm_domain field points to the
1056 * domain member of an object of type struct generic_pm_domain representing
1057 * a power domain consisting of I/O devices.
1059 static void pm_genpd_complete(struct device *dev)
1061 struct generic_pm_domain *genpd;
1064 dev_dbg(dev, "%s()\n", __func__);
1066 genpd = dev_to_genpd(dev);
1070 mutex_lock(&genpd->lock);
1072 run_complete = !genpd->suspend_power_off;
1073 if (--genpd->prepared_count == 0)
1074 genpd->suspend_power_off = false;
1076 mutex_unlock(&genpd->lock);
1079 pm_generic_complete(dev);
1080 pm_runtime_set_active(dev);
1081 pm_runtime_enable(dev);
1082 pm_request_idle(dev);
1087 * genpd_syscore_switch - Switch power during system core suspend or resume.
1088 * @dev: Device that normally is marked as "always on" to switch power for.
1090 * This routine may only be called during the system core (syscore) suspend or
1091 * resume phase for devices whose "always on" flags are set.
1093 static void genpd_syscore_switch(struct device *dev, bool suspend)
1095 struct generic_pm_domain *genpd;
1097 genpd = dev_to_genpd(dev);
1098 if (!pm_genpd_present(genpd))
1102 genpd->suspended_count++;
1103 pm_genpd_sync_poweroff(genpd, false);
1105 pm_genpd_sync_poweron(genpd, false);
1106 genpd->suspended_count--;
1110 void pm_genpd_syscore_poweroff(struct device *dev)
1112 genpd_syscore_switch(dev, true);
1114 EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff);
1116 void pm_genpd_syscore_poweron(struct device *dev)
1118 genpd_syscore_switch(dev, false);
1120 EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron);
1122 #else /* !CONFIG_PM_SLEEP */
1124 #define pm_genpd_prepare NULL
1125 #define pm_genpd_suspend NULL
1126 #define pm_genpd_suspend_late NULL
1127 #define pm_genpd_suspend_noirq NULL
1128 #define pm_genpd_resume_early NULL
1129 #define pm_genpd_resume_noirq NULL
1130 #define pm_genpd_resume NULL
1131 #define pm_genpd_freeze NULL
1132 #define pm_genpd_freeze_late NULL
1133 #define pm_genpd_freeze_noirq NULL
1134 #define pm_genpd_thaw_early NULL
1135 #define pm_genpd_thaw_noirq NULL
1136 #define pm_genpd_thaw NULL
1137 #define pm_genpd_restore_noirq NULL
1138 #define pm_genpd_complete NULL
1140 #endif /* CONFIG_PM_SLEEP */
1142 static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev,
1143 struct generic_pm_domain *genpd,
1144 struct gpd_timing_data *td)
1146 struct generic_pm_domain_data *gpd_data;
1149 ret = dev_pm_get_subsys_data(dev);
1151 return ERR_PTR(ret);
1153 gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL);
1162 gpd_data->base.dev = dev;
1163 gpd_data->td.constraint_changed = true;
1164 gpd_data->td.effective_constraint_ns = -1;
1165 gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier;
1167 spin_lock_irq(&dev->power.lock);
1169 if (dev->power.subsys_data->domain_data) {
1174 dev->power.subsys_data->domain_data = &gpd_data->base;
1175 dev->pm_domain = &genpd->domain;
1177 spin_unlock_irq(&dev->power.lock);
1182 spin_unlock_irq(&dev->power.lock);
1185 dev_pm_put_subsys_data(dev);
1186 return ERR_PTR(ret);
1189 static void genpd_free_dev_data(struct device *dev,
1190 struct generic_pm_domain_data *gpd_data)
1192 spin_lock_irq(&dev->power.lock);
1194 dev->pm_domain = NULL;
1195 dev->power.subsys_data->domain_data = NULL;
1197 spin_unlock_irq(&dev->power.lock);
1200 dev_pm_put_subsys_data(dev);
1204 * __pm_genpd_add_device - Add a device to an I/O PM domain.
1205 * @genpd: PM domain to add the device to.
1206 * @dev: Device to be added.
1207 * @td: Set of PM QoS timing parameters to attach to the device.
1209 int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
1210 struct gpd_timing_data *td)
1212 struct generic_pm_domain_data *gpd_data;
1215 dev_dbg(dev, "%s()\n", __func__);
1217 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev))
1220 gpd_data = genpd_alloc_dev_data(dev, genpd, td);
1221 if (IS_ERR(gpd_data))
1222 return PTR_ERR(gpd_data);
1224 mutex_lock(&genpd->lock);
1226 if (genpd->prepared_count > 0) {
1231 ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0;
1235 genpd->device_count++;
1236 genpd->max_off_time_changed = true;
1238 list_add_tail(&gpd_data->base.list_node, &genpd->dev_list);
1241 mutex_unlock(&genpd->lock);
1244 genpd_free_dev_data(dev, gpd_data);
1246 dev_pm_qos_add_notifier(dev, &gpd_data->nb);
1252 * pm_genpd_remove_device - Remove a device from an I/O PM domain.
1253 * @genpd: PM domain to remove the device from.
1254 * @dev: Device to be removed.
1256 int pm_genpd_remove_device(struct generic_pm_domain *genpd,
1259 struct generic_pm_domain_data *gpd_data;
1260 struct pm_domain_data *pdd;
1263 dev_dbg(dev, "%s()\n", __func__);
1265 if (!genpd || genpd != pm_genpd_lookup_dev(dev))
1268 /* The above validation also means we have existing domain_data. */
1269 pdd = dev->power.subsys_data->domain_data;
1270 gpd_data = to_gpd_data(pdd);
1271 dev_pm_qos_remove_notifier(dev, &gpd_data->nb);
1273 mutex_lock(&genpd->lock);
1275 if (genpd->prepared_count > 0) {
1280 genpd->device_count--;
1281 genpd->max_off_time_changed = true;
1283 if (genpd->detach_dev)
1284 genpd->detach_dev(genpd, dev);
1286 list_del_init(&pdd->list_node);
1288 mutex_unlock(&genpd->lock);
1290 genpd_free_dev_data(dev, gpd_data);
1295 mutex_unlock(&genpd->lock);
1296 dev_pm_qos_add_notifier(dev, &gpd_data->nb);
1302 * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
1303 * @genpd: Master PM domain to add the subdomain to.
1304 * @subdomain: Subdomain to be added.
1306 int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
1307 struct generic_pm_domain *subdomain)
1309 struct gpd_link *link;
1312 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)
1313 || genpd == subdomain)
1316 mutex_lock(&genpd->lock);
1317 mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING);
1319 if (genpd->status == GPD_STATE_POWER_OFF
1320 && subdomain->status != GPD_STATE_POWER_OFF) {
1325 list_for_each_entry(link, &genpd->master_links, master_node) {
1326 if (link->slave == subdomain && link->master == genpd) {
1332 link = kzalloc(sizeof(*link), GFP_KERNEL);
1337 link->master = genpd;
1338 list_add_tail(&link->master_node, &genpd->master_links);
1339 link->slave = subdomain;
1340 list_add_tail(&link->slave_node, &subdomain->slave_links);
1341 if (subdomain->status != GPD_STATE_POWER_OFF)
1342 genpd_sd_counter_inc(genpd);
1345 mutex_unlock(&subdomain->lock);
1346 mutex_unlock(&genpd->lock);
1352 * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain.
1353 * @genpd: Master PM domain to remove the subdomain from.
1354 * @subdomain: Subdomain to be removed.
1356 int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
1357 struct generic_pm_domain *subdomain)
1359 struct gpd_link *link;
1362 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain))
1365 mutex_lock(&genpd->lock);
1367 if (!list_empty(&subdomain->slave_links) || subdomain->device_count) {
1368 pr_warn("%s: unable to remove subdomain %s\n", genpd->name,
1374 list_for_each_entry(link, &genpd->master_links, master_node) {
1375 if (link->slave != subdomain)
1378 mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING);
1380 list_del(&link->master_node);
1381 list_del(&link->slave_node);
1383 if (subdomain->status != GPD_STATE_POWER_OFF)
1384 genpd_sd_counter_dec(genpd);
1386 mutex_unlock(&subdomain->lock);
1393 mutex_unlock(&genpd->lock);
1398 /* Default device callbacks for generic PM domains. */
1401 * pm_genpd_default_save_state - Default "save device state" for PM domains.
1402 * @dev: Device to handle.
1404 static int pm_genpd_default_save_state(struct device *dev)
1406 int (*cb)(struct device *__dev);
1408 if (dev->type && dev->type->pm)
1409 cb = dev->type->pm->runtime_suspend;
1410 else if (dev->class && dev->class->pm)
1411 cb = dev->class->pm->runtime_suspend;
1412 else if (dev->bus && dev->bus->pm)
1413 cb = dev->bus->pm->runtime_suspend;
1417 if (!cb && dev->driver && dev->driver->pm)
1418 cb = dev->driver->pm->runtime_suspend;
1420 return cb ? cb(dev) : 0;
1424 * pm_genpd_default_restore_state - Default PM domains "restore device state".
1425 * @dev: Device to handle.
1427 static int pm_genpd_default_restore_state(struct device *dev)
1429 int (*cb)(struct device *__dev);
1431 if (dev->type && dev->type->pm)
1432 cb = dev->type->pm->runtime_resume;
1433 else if (dev->class && dev->class->pm)
1434 cb = dev->class->pm->runtime_resume;
1435 else if (dev->bus && dev->bus->pm)
1436 cb = dev->bus->pm->runtime_resume;
1440 if (!cb && dev->driver && dev->driver->pm)
1441 cb = dev->driver->pm->runtime_resume;
1443 return cb ? cb(dev) : 0;
1447 * pm_genpd_init - Initialize a generic I/O PM domain object.
1448 * @genpd: PM domain object to initialize.
1449 * @gov: PM domain governor to associate with the domain (may be NULL).
1450 * @is_off: Initial value of the domain's power_is_off field.
1452 void pm_genpd_init(struct generic_pm_domain *genpd,
1453 struct dev_power_governor *gov, bool is_off)
1455 if (IS_ERR_OR_NULL(genpd))
1458 INIT_LIST_HEAD(&genpd->master_links);
1459 INIT_LIST_HEAD(&genpd->slave_links);
1460 INIT_LIST_HEAD(&genpd->dev_list);
1461 mutex_init(&genpd->lock);
1463 INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn);
1464 atomic_set(&genpd->sd_count, 0);
1465 genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE;
1466 genpd->device_count = 0;
1467 genpd->max_off_time_ns = -1;
1468 genpd->max_off_time_changed = true;
1469 genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend;
1470 genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume;
1471 genpd->domain.ops.prepare = pm_genpd_prepare;
1472 genpd->domain.ops.suspend = pm_genpd_suspend;
1473 genpd->domain.ops.suspend_late = pm_genpd_suspend_late;
1474 genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq;
1475 genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq;
1476 genpd->domain.ops.resume_early = pm_genpd_resume_early;
1477 genpd->domain.ops.resume = pm_genpd_resume;
1478 genpd->domain.ops.freeze = pm_genpd_freeze;
1479 genpd->domain.ops.freeze_late = pm_genpd_freeze_late;
1480 genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq;
1481 genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq;
1482 genpd->domain.ops.thaw_early = pm_genpd_thaw_early;
1483 genpd->domain.ops.thaw = pm_genpd_thaw;
1484 genpd->domain.ops.poweroff = pm_genpd_suspend;
1485 genpd->domain.ops.poweroff_late = pm_genpd_suspend_late;
1486 genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq;
1487 genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq;
1488 genpd->domain.ops.restore_early = pm_genpd_resume_early;
1489 genpd->domain.ops.restore = pm_genpd_resume;
1490 genpd->domain.ops.complete = pm_genpd_complete;
1491 genpd->dev_ops.save_state = pm_genpd_default_save_state;
1492 genpd->dev_ops.restore_state = pm_genpd_default_restore_state;
1494 if (genpd->flags & GENPD_FLAG_PM_CLK) {
1495 genpd->dev_ops.stop = pm_clk_suspend;
1496 genpd->dev_ops.start = pm_clk_resume;
1499 mutex_lock(&gpd_list_lock);
1500 list_add(&genpd->gpd_list_node, &gpd_list);
1501 mutex_unlock(&gpd_list_lock);
1503 EXPORT_SYMBOL_GPL(pm_genpd_init);
1505 #ifdef CONFIG_PM_GENERIC_DOMAINS_OF
1507 * Device Tree based PM domain providers.
1509 * The code below implements generic device tree based PM domain providers that
1510 * bind device tree nodes with generic PM domains registered in the system.
1512 * Any driver that registers generic PM domains and needs to support binding of
1513 * devices to these domains is supposed to register a PM domain provider, which
1514 * maps a PM domain specifier retrieved from the device tree to a PM domain.
1516 * Two simple mapping functions have been provided for convenience:
1517 * - __of_genpd_xlate_simple() for 1:1 device tree node to PM domain mapping.
1518 * - __of_genpd_xlate_onecell() for mapping of multiple PM domains per node by
1523 * struct of_genpd_provider - PM domain provider registration structure
1524 * @link: Entry in global list of PM domain providers
1525 * @node: Pointer to device tree node of PM domain provider
1526 * @xlate: Provider-specific xlate callback mapping a set of specifier cells
1528 * @data: context pointer to be passed into @xlate callback
1530 struct of_genpd_provider {
1531 struct list_head link;
1532 struct device_node *node;
1533 genpd_xlate_t xlate;
1537 /* List of registered PM domain providers. */
1538 static LIST_HEAD(of_genpd_providers);
1539 /* Mutex to protect the list above. */
1540 static DEFINE_MUTEX(of_genpd_mutex);
1543 * __of_genpd_xlate_simple() - Xlate function for direct node-domain mapping
1544 * @genpdspec: OF phandle args to map into a PM domain
1545 * @data: xlate function private data - pointer to struct generic_pm_domain
1547 * This is a generic xlate function that can be used to model PM domains that
1548 * have their own device tree nodes. The private data of xlate function needs
1549 * to be a valid pointer to struct generic_pm_domain.
1551 struct generic_pm_domain *__of_genpd_xlate_simple(
1552 struct of_phandle_args *genpdspec,
1555 if (genpdspec->args_count != 0)
1556 return ERR_PTR(-EINVAL);
1559 EXPORT_SYMBOL_GPL(__of_genpd_xlate_simple);
1562 * __of_genpd_xlate_onecell() - Xlate function using a single index.
1563 * @genpdspec: OF phandle args to map into a PM domain
1564 * @data: xlate function private data - pointer to struct genpd_onecell_data
1566 * This is a generic xlate function that can be used to model simple PM domain
1567 * controllers that have one device tree node and provide multiple PM domains.
1568 * A single cell is used as an index into an array of PM domains specified in
1569 * the genpd_onecell_data struct when registering the provider.
1571 struct generic_pm_domain *__of_genpd_xlate_onecell(
1572 struct of_phandle_args *genpdspec,
1575 struct genpd_onecell_data *genpd_data = data;
1576 unsigned int idx = genpdspec->args[0];
1578 if (genpdspec->args_count != 1)
1579 return ERR_PTR(-EINVAL);
1581 if (idx >= genpd_data->num_domains) {
1582 pr_err("%s: invalid domain index %u\n", __func__, idx);
1583 return ERR_PTR(-EINVAL);
1586 if (!genpd_data->domains[idx])
1587 return ERR_PTR(-ENOENT);
1589 return genpd_data->domains[idx];
1591 EXPORT_SYMBOL_GPL(__of_genpd_xlate_onecell);
1594 * __of_genpd_add_provider() - Register a PM domain provider for a node
1595 * @np: Device node pointer associated with the PM domain provider.
1596 * @xlate: Callback for decoding PM domain from phandle arguments.
1597 * @data: Context pointer for @xlate callback.
1599 int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
1602 struct of_genpd_provider *cp;
1604 cp = kzalloc(sizeof(*cp), GFP_KERNEL);
1608 cp->node = of_node_get(np);
1612 mutex_lock(&of_genpd_mutex);
1613 list_add(&cp->link, &of_genpd_providers);
1614 mutex_unlock(&of_genpd_mutex);
1615 pr_debug("Added domain provider from %s\n", np->full_name);
1619 EXPORT_SYMBOL_GPL(__of_genpd_add_provider);
1622 * of_genpd_del_provider() - Remove a previously registered PM domain provider
1623 * @np: Device node pointer associated with the PM domain provider
1625 void of_genpd_del_provider(struct device_node *np)
1627 struct of_genpd_provider *cp;
1629 mutex_lock(&of_genpd_mutex);
1630 list_for_each_entry(cp, &of_genpd_providers, link) {
1631 if (cp->node == np) {
1632 list_del(&cp->link);
1633 of_node_put(cp->node);
1638 mutex_unlock(&of_genpd_mutex);
1640 EXPORT_SYMBOL_GPL(of_genpd_del_provider);
1643 * of_genpd_get_from_provider() - Look-up PM domain
1644 * @genpdspec: OF phandle args to use for look-up
1646 * Looks for a PM domain provider under the node specified by @genpdspec and if
1647 * found, uses xlate function of the provider to map phandle args to a PM
1650 * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR()
1653 struct generic_pm_domain *of_genpd_get_from_provider(
1654 struct of_phandle_args *genpdspec)
1656 struct generic_pm_domain *genpd = ERR_PTR(-ENOENT);
1657 struct of_genpd_provider *provider;
1659 mutex_lock(&of_genpd_mutex);
1661 /* Check if we have such a provider in our array */
1662 list_for_each_entry(provider, &of_genpd_providers, link) {
1663 if (provider->node == genpdspec->np)
1664 genpd = provider->xlate(genpdspec, provider->data);
1669 mutex_unlock(&of_genpd_mutex);
1673 EXPORT_SYMBOL_GPL(of_genpd_get_from_provider);
1676 * genpd_dev_pm_detach - Detach a device from its PM domain.
1677 * @dev: Device to detach.
1678 * @power_off: Currently not used
1680 * Try to locate a corresponding generic PM domain, which the device was
1681 * attached to previously. If such is found, the device is detached from it.
1683 static void genpd_dev_pm_detach(struct device *dev, bool power_off)
1685 struct generic_pm_domain *pd;
1689 pd = pm_genpd_lookup_dev(dev);
1693 dev_dbg(dev, "removing from PM domain %s\n", pd->name);
1695 for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) {
1696 ret = pm_genpd_remove_device(pd, dev);
1705 dev_err(dev, "failed to remove from PM domain %s: %d",
1710 /* Check if PM domain can be powered off after removing this device. */
1711 genpd_queue_power_off_work(pd);
1714 static void genpd_dev_pm_sync(struct device *dev)
1716 struct generic_pm_domain *pd;
1718 pd = dev_to_genpd(dev);
1722 genpd_queue_power_off_work(pd);
1726 * genpd_dev_pm_attach - Attach a device to its PM domain using DT.
1727 * @dev: Device to attach.
1729 * Parse device's OF node to find a PM domain specifier. If such is found,
1730 * attaches the device to retrieved pm_domain ops.
1732 * Both generic and legacy Samsung-specific DT bindings are supported to keep
1733 * backwards compatibility with existing DTBs.
1735 * Returns 0 on successfully attached PM domain or negative error code. Note
1736 * that if a power-domain exists for the device, but it cannot be found or
1737 * turned on, then return -EPROBE_DEFER to ensure that the device is not
1738 * probed and to re-try again later.
1740 int genpd_dev_pm_attach(struct device *dev)
1742 struct of_phandle_args pd_args;
1743 struct generic_pm_domain *pd;
1753 ret = of_parse_phandle_with_args(dev->of_node, "power-domains",
1754 "#power-domain-cells", 0, &pd_args);
1760 * Try legacy Samsung-specific bindings
1761 * (for backwards compatibility of DT ABI)
1763 pd_args.args_count = 0;
1764 pd_args.np = of_parse_phandle(dev->of_node,
1765 "samsung,power-domain", 0);
1770 pd = of_genpd_get_from_provider(&pd_args);
1772 dev_dbg(dev, "%s() failed to find PM domain: %ld\n",
1773 __func__, PTR_ERR(pd));
1774 of_node_put(dev->of_node);
1775 return -EPROBE_DEFER;
1778 dev_dbg(dev, "adding to PM domain %s\n", pd->name);
1780 for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) {
1781 ret = pm_genpd_add_device(pd, dev);
1790 dev_err(dev, "failed to add to PM domain %s: %d",
1792 of_node_put(dev->of_node);
1796 dev->pm_domain->detach = genpd_dev_pm_detach;
1797 dev->pm_domain->sync = genpd_dev_pm_sync;
1798 ret = pm_genpd_poweron(pd);
1801 return ret ? -EPROBE_DEFER : 0;
1803 EXPORT_SYMBOL_GPL(genpd_dev_pm_attach);
1804 #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
1807 /*** debugfs support ***/
1809 #ifdef CONFIG_PM_ADVANCED_DEBUG
1810 #include <linux/pm.h>
1811 #include <linux/device.h>
1812 #include <linux/debugfs.h>
1813 #include <linux/seq_file.h>
1814 #include <linux/init.h>
1815 #include <linux/kobject.h>
1816 static struct dentry *pm_genpd_debugfs_dir;
1819 * TODO: This function is a slightly modified version of rtpm_status_show
1820 * from sysfs.c, so generalize it.
1822 static void rtpm_status_str(struct seq_file *s, struct device *dev)
1824 static const char * const status_lookup[] = {
1825 [RPM_ACTIVE] = "active",
1826 [RPM_RESUMING] = "resuming",
1827 [RPM_SUSPENDED] = "suspended",
1828 [RPM_SUSPENDING] = "suspending"
1832 if (dev->power.runtime_error)
1834 else if (dev->power.disable_depth)
1836 else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup))
1837 p = status_lookup[dev->power.runtime_status];
1844 static int pm_genpd_summary_one(struct seq_file *s,
1845 struct generic_pm_domain *genpd)
1847 static const char * const status_lookup[] = {
1848 [GPD_STATE_ACTIVE] = "on",
1849 [GPD_STATE_POWER_OFF] = "off"
1851 struct pm_domain_data *pm_data;
1852 const char *kobj_path;
1853 struct gpd_link *link;
1856 ret = mutex_lock_interruptible(&genpd->lock);
1858 return -ERESTARTSYS;
1860 if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup)))
1862 seq_printf(s, "%-30s %-15s ", genpd->name, status_lookup[genpd->status]);
1865 * Modifications on the list require holding locks on both
1866 * master and slave, so we are safe.
1867 * Also genpd->name is immutable.
1869 list_for_each_entry(link, &genpd->master_links, master_node) {
1870 seq_printf(s, "%s", link->slave->name);
1871 if (!list_is_last(&link->master_node, &genpd->master_links))
1875 list_for_each_entry(pm_data, &genpd->dev_list, list_node) {
1876 kobj_path = kobject_get_path(&pm_data->dev->kobj, GFP_KERNEL);
1877 if (kobj_path == NULL)
1880 seq_printf(s, "\n %-50s ", kobj_path);
1881 rtpm_status_str(s, pm_data->dev);
1887 mutex_unlock(&genpd->lock);
1892 static int pm_genpd_summary_show(struct seq_file *s, void *data)
1894 struct generic_pm_domain *genpd;
1897 seq_puts(s, "domain status slaves\n");
1898 seq_puts(s, " /device runtime status\n");
1899 seq_puts(s, "----------------------------------------------------------------------\n");
1901 ret = mutex_lock_interruptible(&gpd_list_lock);
1903 return -ERESTARTSYS;
1905 list_for_each_entry(genpd, &gpd_list, gpd_list_node) {
1906 ret = pm_genpd_summary_one(s, genpd);
1910 mutex_unlock(&gpd_list_lock);
1915 static int pm_genpd_summary_open(struct inode *inode, struct file *file)
1917 return single_open(file, pm_genpd_summary_show, NULL);
1920 static const struct file_operations pm_genpd_summary_fops = {
1921 .open = pm_genpd_summary_open,
1923 .llseek = seq_lseek,
1924 .release = single_release,
1927 static int __init pm_genpd_debug_init(void)
1931 pm_genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL);
1933 if (!pm_genpd_debugfs_dir)
1936 d = debugfs_create_file("pm_genpd_summary", S_IRUGO,
1937 pm_genpd_debugfs_dir, NULL, &pm_genpd_summary_fops);
1943 late_initcall(pm_genpd_debug_init);
1945 static void __exit pm_genpd_debug_exit(void)
1947 debugfs_remove_recursive(pm_genpd_debugfs_dir);
1949 __exitcall(pm_genpd_debug_exit);
1950 #endif /* CONFIG_PM_ADVANCED_DEBUG */