Messages in this thread Patch in this message | | | From | Wenyou Yang <> | Subject | [PATCH v2] rtc: at91rm9200: clear RTC alarm status flag prior to suspending | Date | Mon, 12 Oct 2015 16:39:23 +0800 |
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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> ---
Changes in v2: - Add more detail commit log.
drivers/rtc/rtc-at91rm9200.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/rtc/rtc-at91rm9200.c b/drivers/rtc/rtc-at91rm9200.c index cb62e21..b60fd47 100644 --- a/drivers/rtc/rtc-at91rm9200.c +++ b/drivers/rtc/rtc-at91rm9200.c @@ -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) { -- 1.7.9.5
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