4.4-stable review patch. If anyone has any objections, please let me know.
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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 @@ -379,6 +379,13 @@ 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) { @@ -411,8 +418,11 @@ 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 @@ -421,16 +431,6 @@ 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);