Messages in this thread Patch in this message | | | From | Alexandre Belloni <> | Subject | [PATCH v3 4/4] clocksource: timer-atmel-pit: simplify IRQ handler | Date | Tue, 23 Aug 2016 10:44:05 +0200 |
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Because the PIT is also a proper clocksource, the timekeeping code is already able to handle lost ticks.
Reported-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> --- drivers/clocksource/timer-atmel-pit.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-)
diff --git a/drivers/clocksource/timer-atmel-pit.c b/drivers/clocksource/timer-atmel-pit.c index 633a94429842..2e215e8e6c1d 100644 --- a/drivers/clocksource/timer-atmel-pit.c +++ b/drivers/clocksource/timer-atmel-pit.c @@ -152,15 +152,10 @@ static irqreturn_t at91sam926x_pit_interrupt(int irq, void *dev_id) /* The PIT interrupt may be disabled, and is shared */ if (clockevent_state_periodic(&data->clkevt) && (pit_read(data->base, AT91_PIT_SR) & AT91_PIT_PITS)) { - unsigned nr_ticks; - /* Get number of ticks performed before irq, and ack it */ - nr_ticks = PIT_PICNT(pit_read(data->base, AT91_PIT_PIVR)); - do { - data->cnt += data->cycle; - data->clkevt.event_handler(&data->clkevt); - nr_ticks--; - } while (nr_ticks); + data->cnt += data->cycle * PIT_PICNT(pit_read(data->base, + AT91_PIT_PIVR)); + data->clkevt.event_handler(&data->clkevt); return IRQ_HANDLED; } -- 2.8.1
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