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| author |   Jisheng Zhang <jszhang@marvell.com> | 2016-02-26 17:45:57 +0800 |
|---|---|---|
| committer |   Daniel Lezcano <daniel.lezcano@linaro.org> | 2016-04-28 15:09:03 +0200 |
| commit | 457353260d9ff4b89bcf21c9142b2f54ed75699e (patch) | |
| tree | e6077b064485d548ce59ac071e520eeebed28ce2 /drivers/clocksource/dw_apb_timer.c | |
| parent | time: Introduce do_sys_settimeofday64() (diff) | |
| download | linux-dev-457353260d9ff4b89bcf21c9142b2f54ed75699e.tar.xz linux-dev-457353260d9ff4b89bcf21c9142b2f54ed75699e.zip | |
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.c | 1 |
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; |