rtc: goldfish: Enable interrupt in set_alarm() when necessary

When use goldfish rtc, the "hwclock" command fails with "select() to
/dev/rtc to wait for clock tick timed out". This is because "hwclock"
need the set_alarm() hook to enable interrupt when alrm->enabled is
true. This operation is missing in goldfish rtc (but other rtc drivers,
such as cmos rtc, enable interrupt here), so add it.

Signed-off-by: Huacai Chen <chenhc@lemote.com>
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/1592654683-31314-1-git-send-email-chenhc@lemote.com

diff --git a/drivers/rtc/rtc-goldfish.c b/drivers/rtc/rtc-goldfish.c
index 2779715..6349d2c 100644 (file)
--- a/drivers/rtc/rtc-goldfish.c
+++ b/drivers/rtc/rtc-goldfish.c
@@ -73,6 +73,7 @@ static int goldfish_rtc_set_alarm(struct device *dev,
                rtc_alarm64 = rtc_tm_to_time64(&alrm->time) * NSEC_PER_SEC;
                writel((rtc_alarm64 >> 32), base + TIMER_ALARM_HIGH);
                writel(rtc_alarm64, base + TIMER_ALARM_LOW);
+               writel(1, base + TIMER_IRQ_ENABLED);
        } else {
                /*
                 * if this function was called with enabled=0