Commit 921372bf authored Oct 12, 2015 by Wenyou Yang Committed by Alexandre Belloni Nov 08, 2015

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



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>

parent 3cfcb50b

drivers/rtc/rtc-at91rm9200.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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) {