From: "Rafael J. Wysocki" <rjw@sisk.pl> To: Linux PM list <linux-pm@vger.kernel.org> Cc: LKML <linux-kernel@vger.kernel.org>, Linux-sh list <linux-sh@vger.kernel.org>, Magnus Damm <magnus.damm@gmail.com>, Paul Mundt <lethal@linux-sh.org>, Thomas Gleixner <tglx@linutronix.de> Subject: [PATCH 3/15] timekeeping: Add suspend and resume of clock event devices Date: Sun, 05 Aug 2012 23:40:41 +0000 [thread overview] Message-ID: <201208060140.41761.rjw@sisk.pl> (raw) In-Reply-To: <201208060138.03950.rjw@sisk.pl> 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> --- include/linux/clockchips.h | 5 +++++ kernel/time/clockevents.c | 24 ++++++++++++++++++++++++ kernel/time/timekeeping.c | 2 ++ 3 files changed, 31 insertions(+) Index: linux/include/linux/clockchips.h =================================--- linux.orig/include/linux/clockchips.h +++ linux/include/linux/clockchips.h @@ -97,6 +97,8 @@ struct clock_event_device { void (*broadcast)(const struct cpumask *mask); void (*set_mode)(enum clock_event_mode mode, struct clock_event_device *); + void (*suspend)(struct clock_event_device *); + void (*resume)(struct clock_event_device *); unsigned long min_delta_ticks; unsigned long max_delta_ticks; @@ -156,6 +158,9 @@ clockevents_calc_mult_shift(struct clock freq, minsec); } +extern void clockevents_suspend(void); +extern void clockevents_resume(void); + #ifdef CONFIG_GENERIC_CLOCKEVENTS extern void clockevents_notify(unsigned long reason, void *arg); #else Index: linux/kernel/time/clockevents.c =================================--- linux.orig/kernel/time/clockevents.c +++ linux/kernel/time/clockevents.c @@ -397,6 +397,30 @@ void clockevents_exchange_device(struct 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 Index: linux/kernel/time/timekeeping.c =================================--- linux.orig/kernel/time/timekeeping.c +++ linux/kernel/time/timekeeping.c @@ -750,6 +750,7 @@ static void timekeeping_resume(void) read_persistent_clock(&ts); + clockevents_resume(); clocksource_resume(); write_seqlock_irqsave(&tk->lock, flags); @@ -809,6 +810,7 @@ static int timekeeping_suspend(void) clockevents_notify(CLOCK_EVT_NOTIFY_SUSPEND, NULL); clocksource_suspend(); + clockevents_suspend(); return 0; }
WARNING: multiple messages have this Message-ID (diff)
From: "Rafael J. Wysocki" <rjw@sisk.pl> To: Linux PM list <linux-pm@vger.kernel.org> Cc: LKML <linux-kernel@vger.kernel.org>, "Linux-sh list" <linux-sh@vger.kernel.org>, Magnus Damm <magnus.damm@gmail.com>, Paul Mundt <lethal@linux-sh.org>, Thomas Gleixner <tglx@linutronix.de> Subject: [PATCH 3/15] timekeeping: Add suspend and resume of clock event devices Date: Mon, 6 Aug 2012 01:40:41 +0200 [thread overview] Message-ID: <201208060140.41761.rjw@sisk.pl> (raw) In-Reply-To: <201208060138.03950.rjw@sisk.pl> 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> --- include/linux/clockchips.h | 5 +++++ kernel/time/clockevents.c | 24 ++++++++++++++++++++++++ kernel/time/timekeeping.c | 2 ++ 3 files changed, 31 insertions(+) Index: linux/include/linux/clockchips.h =================================================================== --- linux.orig/include/linux/clockchips.h +++ linux/include/linux/clockchips.h @@ -97,6 +97,8 @@ struct clock_event_device { void (*broadcast)(const struct cpumask *mask); void (*set_mode)(enum clock_event_mode mode, struct clock_event_device *); + void (*suspend)(struct clock_event_device *); + void (*resume)(struct clock_event_device *); unsigned long min_delta_ticks; unsigned long max_delta_ticks; @@ -156,6 +158,9 @@ clockevents_calc_mult_shift(struct clock freq, minsec); } +extern void clockevents_suspend(void); +extern void clockevents_resume(void); + #ifdef CONFIG_GENERIC_CLOCKEVENTS extern void clockevents_notify(unsigned long reason, void *arg); #else Index: linux/kernel/time/clockevents.c =================================================================== --- linux.orig/kernel/time/clockevents.c +++ linux/kernel/time/clockevents.c @@ -397,6 +397,30 @@ void clockevents_exchange_device(struct 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 Index: linux/kernel/time/timekeeping.c =================================================================== --- linux.orig/kernel/time/timekeeping.c +++ linux/kernel/time/timekeeping.c @@ -750,6 +750,7 @@ static void timekeeping_resume(void) read_persistent_clock(&ts); + clockevents_resume(); clocksource_resume(); write_seqlock_irqsave(&tk->lock, flags); @@ -809,6 +810,7 @@ static int timekeeping_suspend(void) clockevents_notify(CLOCK_EVT_NOTIFY_SUSPEND, NULL); clocksource_suspend(); + clockevents_suspend(); return 0; }
next prev parent reply other threads:[~2012-08-05 23:40 UTC|newest] Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-07-29 14:12 [RFC][PATCH 0/6] PM: Suspend/resume for clock sources/clock event devices in PM domains Rafael J. Wysocki 2012-07-29 14:12 ` Rafael J. Wysocki 2012-07-29 14:13 ` [RFC][PATCH 1/6] PM / Domains: Introduce simplified power on routine for system resume Rafael J. Wysocki 2012-07-29 14:13 ` Rafael J. Wysocki 2012-07-29 14:14 ` [RFC][PATCH 2/6] PM / Domains: Add power off/on function for system core suspend stage Rafael J. Wysocki 2012-07-29 14:14 ` Rafael J. Wysocki 2012-07-29 14:15 ` [RFC][PATCH 3/6] timekeeping: Add suspend and resume of clock event devices Rafael J. Wysocki 2012-07-29 14:15 ` Rafael J. Wysocki 2012-07-29 14:16 ` [RFC][PATCH 4/6] sh: TMU: Introduce clocksource/clock events suspend/resume routines Rafael J. Wysocki 2012-07-29 14:16 ` Rafael J. Wysocki 2012-07-29 14:16 ` [RFC][PATCH 5/6] sh: CMT: " Rafael J. Wysocki 2012-07-29 14:16 ` Rafael J. Wysocki 2012-07-29 14:17 ` [RFC][PATCH 6/6] sh: MTU2: Introduce clock " Rafael J. Wysocki 2012-07-29 14:17 ` Rafael J. Wysocki 2012-08-05 23:38 ` [PATCH 0/15] PM: Suspend/resume and runtime PM for clock sources/clock event devices in PM domains Rafael J. Wysocki 2012-08-05 23:38 ` Rafael J. Wysocki 2012-08-05 23:39 ` [PATCH 1/15] PM / Domains: Introduce simplified power on routine for system resume Rafael J. Wysocki 2012-08-05 23:39 ` Rafael J. Wysocki 2012-08-05 23:39 ` [PATCH 2/15] PM / Domains: Add power off/on function for system core suspend stage Rafael J. Wysocki 2012-08-05 23:39 ` Rafael J. Wysocki 2012-08-05 23:40 ` Rafael J. Wysocki [this message] 2012-08-05 23:40 ` [PATCH 3/15] timekeeping: Add suspend and resume of clock event devices Rafael J. Wysocki 2012-08-05 23:41 ` [PATCH 4/15] sh: TMU: Introduce clocksource/clock events suspend/resume routines Rafael J. Wysocki 2012-08-05 23:41 ` Rafael J. Wysocki 2012-08-05 23:43 ` [PATCH 5/15] sh: CMT: " Rafael J. Wysocki 2012-08-05 23:43 ` Rafael J. Wysocki 2012-08-05 23:43 ` [PATCH 6/15] sh: MTU2: Introduce clock " Rafael J. Wysocki 2012-08-05 23:43 ` Rafael J. Wysocki 2012-08-05 23:44 ` [PATCH 7/15] PM: Reorganize device PM initialization Rafael J. Wysocki 2012-08-05 23:44 ` Rafael J. Wysocki 2012-08-05 23:45 ` [PATCH 8/15] PM / Runtime: Allow helpers to be called by early platform drivers Rafael J. Wysocki 2012-08-05 23:45 ` Rafael J. Wysocki 2012-08-05 23:45 ` [PATCH 9/15] PM / Domains: Rename the always_on device flag to syscore Rafael J. Wysocki 2012-08-05 23:45 ` Rafael J. Wysocki 2012-08-05 23:46 ` [PATCH 10/15] PM / Domains: Move syscore flag from subsys data to struct device Rafael J. Wysocki 2012-08-05 23:46 ` Rafael J. Wysocki 2012-08-05 23:47 ` [PATCH 11/15] PM / Domains: Do not measure start time for "irq safe" devices Rafael J. Wysocki 2012-08-05 23:47 ` Rafael J. Wysocki 2012-08-05 23:48 ` [PATCH 12/15] sh: TMU: Basic runtime PM support Rafael J. Wysocki 2012-08-05 23:48 ` Rafael J. Wysocki 2012-08-05 23:48 ` [PATCH 13/15] sh: CMT: " Rafael J. Wysocki 2012-08-05 23:48 ` Rafael J. Wysocki 2012-08-05 23:49 ` [PATCH 14/15] sh: MTU2: " Rafael J. Wysocki 2012-08-05 23:49 ` Rafael J. Wysocki 2012-08-11 9:39 ` Geert Uytterhoeven 2012-08-11 9:39 ` Geert Uytterhoeven 2012-08-11 22:29 ` Rafael J. Wysocki 2012-08-11 22:29 ` Rafael J. Wysocki 2012-08-05 23:53 ` [PATCH 15/15] PM: Do not use the syscore flag for runtime PM Rafael J. Wysocki 2012-08-05 23:53 ` Rafael J. Wysocki
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