diff options
| author | Viresh Kumar <viresh.kumar@linaro.org> | 2015-02-27 17:21:32 +0530 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-03-27 10:26:19 +0100 |
| commit | 554ef3876c6acdff1331feab10275e9e9e0adb84 (patch) | |
| tree | e01d4c83d5f177e814e5cd749206ef9801081b2b /kernel/time/clockevents.c | |
| parent | fe5fba05b46c791c95a9f34228ac495f81f72fc0 (diff) | |
clockevents: Handle tick device's resume separately
Upcoming patch will redefine possible states of a clockevent
device. The RESUME mode is a special case only for tick's
clockevent devices. In future it can be replaced by ->resume()
callback already available for clockevent devices.
Lets handle it separately so that clockevents_set_mode() only
handles states valid across all devices. This also renames
set_mode_resume() to tick_resume() to make it more explicit.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Kevin Hilman <khilman@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Cc: linaro-kernel@lists.linaro.org
Cc: linaro-networking@linaro.org
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/c1b0112410870f49e7bf06958e1483eac6c15e20.1425037853.git.viresh.kumar@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/time/clockevents.c')
| -rw-r--r-- | kernel/time/clockevents.c | 30 |
1 files changed, 21 insertions, 9 deletions
diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c index 489642b08d64..1b0ea63de69c 100644 --- a/kernel/time/clockevents.c +++ b/kernel/time/clockevents.c @@ -100,7 +100,7 @@ static int __clockevents_set_mode(struct clock_event_device *dev, /* Transition with legacy set_mode() callback */ if (dev->set_mode) { /* Legacy callback doesn't support new modes */ - if (mode > CLOCK_EVT_MODE_RESUME) + if (mode > CLOCK_EVT_MODE_ONESHOT) return -ENOSYS; dev->set_mode(mode, dev); return 0; @@ -133,13 +133,6 @@ static int __clockevents_set_mode(struct clock_event_device *dev, return -ENOSYS; return dev->set_mode_oneshot(dev); - case CLOCK_EVT_MODE_RESUME: - /* Optional callback */ - if (dev->set_mode_resume) - return dev->set_mode_resume(dev); - else - return 0; - default: return -ENOSYS; } @@ -184,6 +177,25 @@ void clockevents_shutdown(struct clock_event_device *dev) dev->next_event.tv64 = KTIME_MAX; } +/** + * clockevents_tick_resume - Resume the tick device before using it again + * @dev: device to resume + */ +int clockevents_tick_resume(struct clock_event_device *dev) +{ + int ret = 0; + + if (dev->set_mode) + dev->set_mode(CLOCK_EVT_MODE_RESUME, dev); + else if (dev->tick_resume) + ret = dev->tick_resume(dev); + + if (likely(!ret)) + dev->mode = CLOCK_EVT_MODE_RESUME; + + return ret; +} + #ifdef CONFIG_GENERIC_CLOCKEVENTS_MIN_ADJUST /* Limit min_delta to a jiffie */ @@ -433,7 +445,7 @@ static int clockevents_sanity_check(struct clock_event_device *dev) if (dev->set_mode) { /* We shouldn't be supporting new modes now */ WARN_ON(dev->set_mode_periodic || dev->set_mode_oneshot || - dev->set_mode_shutdown || dev->set_mode_resume); + dev->set_mode_shutdown || dev->tick_resume); return 0; } |