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rtc: at91rm9200: clear RTC alarm status flag prior to suspending

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As said in the SAMA5D2 datasheet, "Prior to instructing the device
to enter ULP mode 1, ... and the internal sources of wake-up must
be cleared."

This patch is to clear the RTC alarm status flag prior to suspending
to avoid the erroneous wake-up activity, as it is often used as
the wake-up source for the ULP mode 1.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
This commit is contained in:
Wenyou Yang 2015-10-12 16:39:23 +08:00 committed by Alexandre Belloni
parent 3cfcb50b48
commit 921372bf5a
1 changed files with 2 additions and 0 deletions
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drivers/rtc/rtc-at91rm9200.c
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@ -495,6 +495,8 @@ static int at91_rtc_suspend(struct device *dev)
/* this IRQ is shared with DBGU and other hardware which isn't
* necessarily doing PM like we are...
*/
at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
at91_rtc_imr = at91_rtc_read_imr()
& (AT91_RTC_ALARM|AT91_RTC_SECEV);
if (at91_rtc_imr) {