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authorRafael J. Wysocki <rjw@sisk.pl>2012-08-06 01:40:41 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2012-09-04 01:36:01 +0200
commitadc78e6b9946a4b22e22403d961f3b03c469e5d3 (patch)
treee0837d6a5778c9bfa0a698f10a7cbedf9cf76cd0 /kernel/time
parent77f827de07432a74821cf0f831d699544b2d474f (diff)
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timekeeping: Add suspend and resume of clock event devices
Some clock event devices, for example such that belong to PM domains, need to be handled in a spcial way during the timekeeping suspend and resume (which takes place in the system core, or "syscore", stages of system power transitions) in analogy with clock sources. Introduce .suspend() and .resume() callbacks for clock event devices that will be executed by timekeeping_suspend/_resume(), respectively, next the the clock sources' .suspend() and .resume() callbacks. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'kernel/time')
-rw-r--r--kernel/time/clockevents.c24
-rw-r--r--kernel/time/timekeeping.c2
2 files changed, 26 insertions, 0 deletions
diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
index 7e1ce012a851..30b6de0d977c 100644
--- a/kernel/time/clockevents.c
+++ b/kernel/time/clockevents.c
@@ -397,6 +397,30 @@ void clockevents_exchange_device(struct clock_event_device *old,
local_irq_restore(flags);
}
+/**
+ * clockevents_suspend - suspend clock devices
+ */
+void clockevents_suspend(void)
+{
+ struct clock_event_device *dev;
+
+ list_for_each_entry_reverse(dev, &clockevent_devices, list)
+ if (dev->suspend)
+ dev->suspend(dev);
+}
+
+/**
+ * clockevents_resume - resume clock devices
+ */
+void clockevents_resume(void)
+{
+ struct clock_event_device *dev;
+
+ list_for_each_entry(dev, &clockevent_devices, list)
+ if (dev->resume)
+ dev->resume(dev);
+}
+
#ifdef CONFIG_GENERIC_CLOCKEVENTS
/**
* clockevents_notify - notification about relevant events
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 34e5eac81424..312a675cb240 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -773,6 +773,7 @@ static void timekeeping_resume(void)
read_persistent_clock(&ts);
+ clockevents_resume();
clocksource_resume();
write_seqlock_irqsave(&tk->lock, flags);
@@ -832,6 +833,7 @@ static int timekeeping_suspend(void)
clockevents_notify(CLOCK_EVT_NOTIFY_SUSPEND, NULL);
clocksource_suspend();
+ clockevents_suspend();
return 0;
}