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authorJisheng Zhang <jszhang@marvell.com>2016-02-26 12:45:57 +0300
committerDaniel Lezcano <daniel.lezcano@linaro.org>2016-04-28 16:09:03 +0300
commit457353260d9ff4b89bcf21c9142b2f54ed75699e (patch)
treee6077b064485d548ce59ac071e520eeebed28ce2 /drivers/clocksource/dw_apb_timer.c
parent86d3473224b004f920c107206d181d37db735145 (diff)
downloadlinux-457353260d9ff4b89bcf21c9142b2f54ed75699e.tar.xz
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@marvell.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Diffstat (limited to 'drivers/clocksource/dw_apb_timer.c')
-rw-r--r--drivers/clocksource/dw_apb_timer.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/clocksource/dw_apb_timer.c b/drivers/clocksource/dw_apb_timer.c
index 63345260244d..797505aa2ba4 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;