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Subject[PATCH 5.0 073/238] clocksource/drivers/exynos_mct: Move one-shot check from tick clear to ISR
Date
5.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stuart Menefy <stuart.menefy@mathembedded.com>

commit a5719a40aef956ba704f2aa1c7b977224d60fa96 upstream.

When a timer tick occurs and the clock is in one-shot mode, the timer
needs to be stopped to prevent it triggering subsequent interrupts.
Currently this code is in exynos4_mct_tick_clear(), but as it is
only needed when an ISR occurs move it into exynos4_mct_tick_isr(),
leaving exynos4_mct_tick_clear() just doing what its name suggests it
should.

Signed-off-by: Stuart Menefy <stuart.menefy@mathembedded.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: stable@vger.kernel.org # v4.3+
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/clocksource/exynos_mct.c | 22 +++++++++++-----------
1 file changed, 11 insertions(+), 11 deletions(-)

--- a/drivers/clocksource/exynos_mct.c
+++ b/drivers/clocksource/exynos_mct.c
@@ -388,6 +388,13 @@ static void exynos4_mct_tick_start(unsig
exynos4_mct_write(tmp, mevt->base + MCT_L_TCON_OFFSET);
}

+static void exynos4_mct_tick_clear(struct mct_clock_event_device *mevt)
+{
+ /* Clear the MCT tick interrupt */
+ if (readl_relaxed(reg_base + mevt->base + MCT_L_INT_CSTAT_OFFSET) & 1)
+ exynos4_mct_write(0x1, mevt->base + MCT_L_INT_CSTAT_OFFSET);
+}
+
static int exynos4_tick_set_next_event(unsigned long cycles,
struct clock_event_device *evt)
{
@@ -420,8 +427,11 @@ static int set_state_periodic(struct clo
return 0;
}

-static void exynos4_mct_tick_clear(struct mct_clock_event_device *mevt)
+static irqreturn_t exynos4_mct_tick_isr(int irq, void *dev_id)
{
+ struct mct_clock_event_device *mevt = dev_id;
+ struct clock_event_device *evt = &mevt->evt;
+
/*
* This is for supporting oneshot mode.
* Mct would generate interrupt periodically
@@ -430,16 +440,6 @@ static void exynos4_mct_tick_clear(struc
if (!clockevent_state_periodic(&mevt->evt))
exynos4_mct_tick_stop(mevt);

- /* Clear the MCT tick interrupt */
- if (readl_relaxed(reg_base + mevt->base + MCT_L_INT_CSTAT_OFFSET) & 1)
- exynos4_mct_write(0x1, mevt->base + MCT_L_INT_CSTAT_OFFSET);
-}
-
-static irqreturn_t exynos4_mct_tick_isr(int irq, void *dev_id)
-{
- struct mct_clock_event_device *mevt = dev_id;
- struct clock_event_device *evt = &mevt->evt;
-
exynos4_mct_tick_clear(mevt);

evt->event_handler(evt);

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