Commit-ID: 457353260d9ff4b89bcf21c9142b2f54ed75699e
Gitweb: http://git.kernel.org/tip/457353260d9ff4b89bcf21c9142b2f54ed75699e
Author: Jisheng Zhang <jszhang@xxxxxxxxxxx>
AuthorDate: Fri, 26 Feb 2016 17:45:57 +0800
Committer: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
CommitDate: Thu, 28 Apr 2016 15:09:03 +0200
clockevents/drivers/dw_apb_timer: Implement ->set_state_oneshot_stopped()
The dw_apb_timer only "supports PERIODIC mode and their drivers emulate
ONESHOT over that" as described in commit 8fff52fd5093 ("clockevents:
Introduce CLOCK_EVT_STATE_ONESHOT_STOPPED state").
Inspired by Viresh, I think the dw_apb_timer also needs to implement
the set_state_oneshot_stopped() which is called by the clkevt core,
when the next event is required at an expiry time of 'KTIME_MAX'. This
normally happens with NO_HZ_{IDLE|FULL} in both LOWRES/HIGHRES modes.
This patch makes the clockevent device to stop on such an event, to
avoid spurious interrupts, as explained by the above commit.
Signed-off-by: Jisheng Zhang <jszhang@xxxxxxxxxxx>
Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
Reviewed-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
---
drivers/clocksource/dw_apb_timer.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/clocksource/dw_apb_timer.c b/drivers/clocksource/dw_apb_timer.c
index 6334526..797505a 100644
--- a/drivers/clocksource/dw_apb_timer.c
+++ b/drivers/clocksource/dw_apb_timer.c
@@ -264,6 +264,7 @@ dw_apb_clockevent_init(int cpu, const char *name, unsigned rating,
dw_ced->ced.set_state_shutdown = apbt_shutdown;
dw_ced->ced.set_state_periodic = apbt_set_periodic;
dw_ced->ced.set_state_oneshot = apbt_set_oneshot;
+ dw_ced->ced.set_state_oneshot_stopped = apbt_shutdown;
dw_ced->ced.tick_resume = apbt_resume;
dw_ced->ced.set_next_event = apbt_next_event;
dw_ced->ced.irq = dw_ced->timer.irq;
--
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