linux-kernel - RE: [PATCH v2 07/12] pm: at91: the standby mode uses the same sram function as the suspend to memory mode

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Message-ID: <B256D81BAE5131468A838E5D7A243641BFD35CD3@penmbx01>
Date:	Tue, 27 Jan 2015 04:44:59 +0000
From:	"Yang, Wenyou" <Wenyou.Yang@...el.com>
To:	Sylvain Rochet <sylvain.rochet@...secur.com>
CC:	"Ferre, Nicolas" <Nicolas.FERRE@...el.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"alexandre.belloni@...e-electrons.com" 
	<alexandre.belloni@...e-electrons.com>,
	"peda@...ntia.se" <peda@...ntia.se>
Subject: RE: [PATCH v2 07/12] pm: at91: the standby mode uses the same sram
 function as the suspend to memory mode

Hi Sylvain,

> -----Original Message-----
> From: Sylvain Rochet [mailto:sylvain.rochet@...secur.com]
> Sent: Monday, January 26, 2015 6:10 PM
> To: Yang, Wenyou
> Cc: Ferre, Nicolas; linux@....linux.org.uk; linux-arm-kernel@...ts.infradead.org;
> linux-kernel@...r.kernel.org; alexandre.belloni@...e-electrons.com;
> peda@...ntia.se
> Subject: Re: [PATCH v2 07/12] pm: at91: the standby mode uses the same sram
> function as the suspend to memory mode
> 
> Hello Wenyou,
> 
> 
> On Mon, Jan 26, 2015 at 05:42:11PM +0800, Wenyou Yang wrote:
> > +static int at91_pm_verify_clocks(suspend_state_t state)
> >  {
> >  	unsigned long scsr;
> >  	int i;
> >
> > +	/* For PM_SUSPEND_STANDBY, skip verifying the clock */
> > +	if (state == PM_SUSPEND_STANDBY)
> > +		return 1;
> > +
> 
> In my opinion we should use the select() already in place in
> at91_pm_enter() to do that:
Accepted. Thanks

> 
> >  static int at91_pm_enter(suspend_state_t state)  {
> >  	at91_pinctrl_gpio_suspend();
> >
> >  	switch (state) {
>      (...)
> > +	case PM_SUSPEND_MEM:
> 
> 	/*
> 	 * Ensure that clocks are in a valid state.
> 	 */
> 	if (!at91_pm_verify_clocks())
> 		goto error;
> 	/* FALLTHROUGH */
> 
> > +	case PM_SUSPEND_STANDBY:
> >  		/*
> > -		 * Suspend-to-RAM is like STANDBY plus slow clock mode, so
> 
> 
> Sylvain

Best Regards,
Wenyou Yang