linux-kernel - RE: [PATCH v3 2/3] i2c/at91: add support for system PM

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Message-ID: <B256D81BAE5131468A838E5D7A243641BF59D3F4@penmbx01>
Date:	Mon, 27 Oct 2014 00:35:48 +0000
From:	"Yang, Wenyou" <Wenyou.Yang@...el.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	"wsa@...-dreams.de" <wsa@...-dreams.de>,
	"Desroches, Ludovic" <Ludovic.Desroches@...el.com>
CC:	"khilman@...nel.org" <khilman@...nel.org>,
	"Ferre, Nicolas" <Nicolas.FERRE@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH v3 2/3] i2c/at91: add support for system PM

Hi,

> -----Original Message-----
> From: Sergei Shtylyov [mailto:sergei.shtylyov@...entembedded.com]
> Sent: Friday, October 24, 2014 9:03 PM
> To: Yang, Wenyou; wsa@...-dreams.de; Desroches, Ludovic
> Cc: khilman@...nel.org; Ferre, Nicolas; linux-kernel@...r.kernel.org; linux-
> i2c@...r.kernel.org; linux-arm-kernel@...ts.infradead.org
> Subject: Re: [PATCH v3 2/3] i2c/at91: add support for system PM
> 
> Hello.
> 
> On 10/24/2014 10:50 AM, Wenyou Yang wrote:
> 
> > Signed-off-by: Wenyou Yang <wenyou.yang@...el.com>
> > ---
> >   drivers/i2c/busses/i2c-at91.c |   26 ++++++++++++++++++++++++++
> >   1 file changed, 26 insertions(+)
> 
> > diff --git a/drivers/i2c/busses/i2c-at91.c
> > b/drivers/i2c/busses/i2c-at91.c index a25fb5e..6a84a2a 100644
> > --- a/drivers/i2c/busses/i2c-at91.c
> > +++ b/drivers/i2c/busses/i2c-at91.c
> > @@ -861,7 +861,33 @@ static int at91_twi_runtime_resume(struct device
> > *dev)
> [...]
> > +static int at91_twi_resume_noirq(struct device *dev) {
> > +	int ret;
> > +
> > +	if (!pm_runtime_status_suspended(dev)) {
> > +		ret = at91_twi_runtime_resume(dev);
> 
>     Resume if *not* suspended?
Yes, if it is not runtime_suspended, it must be the system suspended, then resume it. I think so.

> 
> > +		if (ret)
> > +			return ret;
> > +	}
> > +
> > +	pm_runtime_mark_last_busy(dev);
> > +	pm_request_autosuspend(dev);
> > +
> > +	return 0;
> > +}
> > +
> [...]
> 
> WBR, Sergei

Best Regards,
Wenyou Yang
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