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| -rw-r--r-- | chip/ish/hwtimer.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/chip/ish/hwtimer.c b/chip/ish/hwtimer.c index 393e1af4af..6a0c4ea366 100644 --- a/chip/ish/hwtimer.c +++ b/chip/ish/hwtimer.c @@ -219,6 +219,16 @@ static void __hw_clock_source_irq(int timer_id) * overflowed). */ process_timers(timer_id == 0); + + /* + * Clearing interrupt status before the main counter gets increased + * generates an extra interrupt. + * Here, we checks interrupt status register to prevent the extra + * interrupt. It's safe to clear the interrupt again here since + * there's at least MINIMUM_EVENT_DELAY_US delay for the next event + */ + while (HPET_INTR_CLEAR & BIT(timer_id)) + HPET_INTR_CLEAR = BIT(timer_id); } void __hw_clock_source_irq_0(void) |