linux-kernel - [PATCH 9/9] clockevents/drivers/exynos_mct: Implement ->set_state_oneshot

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Message-Id: <1456407438-6131-9-git-send-email-daniel.lezcano@linaro.org>
Date:	Thu, 25 Feb 2016 14:37:17 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	tglx@...utronix.de
Cc:	Viresh Kumar <viresh.kumar@...aro.org>,
	Kukjin Kim <kgene@...nel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	linux-kernel@...r.kernel.org (open list:CLOCKSOURCE, CLOC...),
	linux-arm-kernel@...ts.infradead.org (moderated list:ARM/SAMSUNG
	EXYNO...),
	linux-samsung-soc@...r.kernel.org (moderated list:ARM/SAMSUNG EXYNO...)
Subject: [PATCH 9/9] clockevents/drivers/exynos_mct: Implement ->set_state_oneshot_stopped()

From: Viresh Kumar <viresh.kumar@...aro.org>

set_state_oneshot_stopped() 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: commit 8fff52fd5093
("clockevents: Introduce CLOCK_EVT_STATE_ONESHOT_STOPPED state").

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 drivers/clocksource/exynos_mct.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c
index ff44082..be09bc0 100644
--- a/drivers/clocksource/exynos_mct.c
+++ b/drivers/clocksource/exynos_mct.c
@@ -313,6 +313,7 @@ static struct clock_event_device mct_comp_device = {
 	.set_state_periodic	= mct_set_state_periodic,
 	.set_state_shutdown	= mct_set_state_shutdown,
 	.set_state_oneshot	= mct_set_state_shutdown,
+	.set_state_oneshot_stopped = mct_set_state_shutdown,
 	.tick_resume		= mct_set_state_shutdown,
 };
 
@@ -452,6 +453,7 @@ static int exynos4_local_timer_setup(struct mct_clock_event_device *mevt)
 	evt->set_state_periodic = set_state_periodic;
 	evt->set_state_shutdown = set_state_shutdown;
 	evt->set_state_oneshot = set_state_shutdown;
+	evt->set_state_oneshot_stopped = set_state_shutdown;
 	evt->tick_resume = set_state_shutdown;
 	evt->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT;
 	evt->rating = 450;
-- 
1.9.1