1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-coh901331.c b/drivers/rtc/rtc-coh901331.c
index 7fe1fa26c52..03ea530981d 100644
--- a/drivers/rtc/rtc-coh901331.c
+++ b/drivers/rtc/rtc-coh901331.c
@@ -58,7 +58,16 @@ static irqreturn_t coh901331_interrupt(int irq, void *data)
         clk_enable(rtap->clk);
         /* Ack IRQ */
         writel(1, rtap->virtbase + COH901331_IRQ_EVENT);
+        /*
+         * Disable the interrupt. This is necessary because
+         * the RTC lives on a lower-clocked line and will
+         * not release the IRQ line until after a few (slower)
+         * clock cycles. The interrupt will be re-enabled when
+         * a new alarm is set anyway.
+         */
+        writel(0, rtap->virtbase + COH901331_IRQ_MASK);
         clk_disable(rtap->clk);
+
         /* Set alarm flag */
         rtc_update_irq(rtap->rtc, 1, RTC_AF);
 
@@ -128,6 +137,8 @@ static int coh901331_alarm_irq_enable(struct device *dev, unsigned int enabled)
         else
                 writel(0, rtap->virtbase + COH901331_IRQ_MASK);
         clk_disable(rtap->clk);
+
+        return 0;
 }
 
 static struct rtc_class_ops coh901331_ops = {