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clocksource/drivers/timer-atmel-pit: Simplify IRQ handler 

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>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
This commit is contained in:
Alexandre Belloni 2016-09-09 13:13:50 +02:00 committed by Daniel Lezcano
parent 0d41ec8dbf
commit 2783e5d63a
1 changed files with 3 additions and 8 deletions
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11
drivers/clocksource/timer-atmel-pit.c
View File

@ -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;
}