linux-kernel - RE: [PATCH v2 3/3] pm: at91: add disable/enable the L1/L2 cache while suspend/resume

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Date:	Thu, 29 Jan 2015 02:22:43 +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:	"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>,
	"sylvain.rochet@...secur.com" <sylvain.rochet@...secur.com>,
	"peda@...ntia.se" <peda@...ntia.se>,
	"linux@...im.org.za" <linux@...im.org.za>
Subject: RE: [PATCH v2 3/3] pm: at91: add disable/enable the L1/L2 cache
 while suspend/resume

Hi Sergei,

Thank you for your review.

> -----Original Message-----
> From: Sergei Shtylyov [mailto:sergei.shtylyov@...entembedded.com]
> Sent: Wednesday, January 28, 2015 6:09 PM
> To: Yang, Wenyou; Ferre, Nicolas; linux@....linux.org.uk
> Cc: linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org;
> alexandre.belloni@...e-electrons.com; sylvain.rochet@...secur.com;
> peda@...ntia.se; linux@...im.org.za
> Subject: Re: [PATCH v2 3/3] pm: at91: add disable/enable the L1/L2 cache while
> suspend/resume
> 
> Hello.
> 
> On 1/28/2015 5:24 AM, Wenyou Yang wrote:
> 
> > For the sama5, disable L1 D-cache and L2 cache before the cpu go to
> > wfi, after wakeing up, enable L1 D-cache and L2 cache.
> 
>     Waking.
> 
> > Signed-off-by: Wenyou Yang <wenyou.yang@...el.com>
> > ---
> >   arch/arm/mach-at91/pm.c         |   12 +++++
> >   arch/arm/mach-at91/pm_suspend.S |  107
> +++++++++++++++++++++++++++++++++++++++
> >   2 files changed, 119 insertions(+)
> 
> [...]
> > diff --git a/arch/arm/mach-at91/pm_suspend.S
> > b/arch/arm/mach-at91/pm_suspend.S index 311cc23..02d4e56 100644
> > --- a/arch/arm/mach-at91/pm_suspend.S
> > +++ b/arch/arm/mach-at91/pm_suspend.S
> [...]
> > @@ -324,3 +325,109 @@ ram_restored:
> [...]
> > +l2x_sync:
> 
>     I don't see where this label is used.
I thought it is an indication the following is for L2 cache synchronization. 

It is redundant, remove it.

> 
> > +	ldr	r0, [r2, #L2X0_CACHE_SYNC]
> > +	bic	r0, r0, #0x1
> > +	str	r0, [r2, #L2X0_CACHE_SYNC]
> > +sync:
> > +	ldr	r0, [r2, #L2X0_CACHE_SYNC]
> > +	ands	r0, r0, #0x1
> > +	bne	sync
> > +
> > +skip_l2disable:
> > +	ldmfd	sp!, {r4 - r12, pc}
> > +ENDPROC(at91_disable_l1_l2_cache)
> [...]
> 
> WBR, Sergei

Best Regards,
Wenyou Yang
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