linux-kernel - RE: [PATCH v2 04/12] pm: at91: move the copying the sram function to the sram initializationi phase

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Date:	Tue, 27 Jan 2015 03:27:46 +0000
From:	"Yang, Wenyou" <Wenyou.Yang@...el.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	"Ferre, Nicolas" <Nicolas.FERRE@...el.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>
CC:	"sylvain.rochet@...secur.com" <sylvain.rochet@...secur.com>,
	"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>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH v2 04/12] pm: at91: move the copying the sram function
 to the sram initializationi phase

Hi Sergei,

Thank you for your review.

> -----Original Message-----
> From: Sergei Shtylyov [mailto:sergei.shtylyov@...entembedded.com]
> Sent: Monday, January 26, 2015 8:57 PM
> To: Yang, Wenyou; Ferre, Nicolas; linux@....linux.org.uk
> Cc: sylvain.rochet@...secur.com; linux-kernel@...r.kernel.org;
> alexandre.belloni@...e-electrons.com; peda@...ntia.se; linux-arm-
> kernel@...ts.infradead.org
> Subject: Re: [PATCH v2 04/12] pm: at91: move the copying the sram function to
> the sram initializationi phase
> 
> Hello.
> 
> On 1/26/2015 12:40 PM, Wenyou Yang wrote:
> 
> > To decrease the suspend time, move the copying the sram function to
> > the sram initialization phase, instead of every time go to suspend.
> 
> > Signed-off-by: Wenyou Yang <wenyou.yang@...el.com>
> > Acked-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
> > ---
> >   arch/arm/mach-at91/pm.c |    7 +++----
> >   1 file changed, 3 insertions(+), 4 deletions(-)
> 
> > diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c index
> > 5dd4e41..409185e 100644
> > --- a/arch/arm/mach-at91/pm.c
> > +++ b/arch/arm/mach-at91/pm.c
> > @@ -161,10 +161,6 @@ static int at91_pm_enter(suspend_state_t state)
> >   			 * turning off the main oscillator; reverse on wakeup.
> >   			 */
> >   			if (slow_clock) {
> > -#ifdef CONFIG_AT91_SLOW_CLOCK
> > -				/* copy slow_clock handler to SRAM, and call it */
> > -				memcpy(slow_clock, at91_slow_clock,
> at91_slow_clock_sz);
> > -#endif
> >   				slow_clock(at91_pmc_base, at91_ramc_base[0],
> >   					   at91_ramc_base[1],
> >   					   at91_pm_data.memctrl);
> > @@ -272,6 +268,9 @@ static void __init at91_pm_sram_init(void)
> >   	sram_pbase = gen_pool_virt_to_phys(sram_pool, sram_base);
> >   	slow_clock = __arm_ioremap_exec(sram_pbase, at91_slow_clock_sz,
> > false);
> >
> > +	/* Copy slow_clock handler to SRAM, and call it */
> 
>     You're not calling it here.
> 
> > +	memcpy(slow_clock, at91_slow_clock, at91_slow_clock_sz);
> > +
> >   put_node:
> >   	of_node_put(node);
> >   }
> 
> WBR, Sergei

Best Regards,
Wenyou Yang
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