linux-kernel - RE: [PATCH] rtc: at91rm9200: clear RTC alarm status flag prior to suspending

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Date:	Mon, 12 Oct 2015 07:48:18 +0000
From:	"Yang, Wenyou" <Wenyou.Yang@...el.com>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
CC:	Alessandro Zummo <a.zummo@...ertech.it>,
	"Ferre, Nicolas" <Nicolas.FERRE@...el.com>,
	"Desroches, Ludovic" <Ludovic.Desroches@...el.com>,
	"rtc-linux@...glegroups.com" <rtc-linux@...glegroups.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH] rtc: at91rm9200: clear RTC alarm status flag prior to
 suspending

Hi Alexandre,

> -----Original Message-----
> From: Alexandre Belloni [mailto:alexandre.belloni@...e-electrons.com]
> Sent: 2015年10月12日 14:53
> To: Yang, Wenyou
> Cc: Alessandro Zummo; Ferre, Nicolas; Desroches, Ludovic; rtc-
> linux@...glegroups.com; linux-kernel@...r.kernel.org; linux-arm-
> kernel@...ts.infradead.org
> Subject: Re: [PATCH] rtc: at91rm9200: clear RTC alarm status flag prior to
> suspending
> 
> Hi Wenyou,
> 
> On 12/10/2015 at 09:17:57 +0800, Wenyou Yang wrote :
> > This patch is to clear the RTC alarm status flag prior to suspending
> > to avoid the erroneous wake-up activity.
> >
> 
> Is this a new issue appearing with the sama5d2 or was it present from the
> beginning?
With the sama5d2 ULP1 mode, not from the beginning.

> 
> > Signed-off-by: Wenyou Yang <wenyou.yang@...el.com>
> > ---
> >
> >  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
> >
> 
> --
> Alexandre Belloni, Free Electrons
> Embedded Linux, Kernel and Android engineering
> http://free-electrons.com

Best Regards,
Wenyou Yang