LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: "Yang, Wenyou" <Wenyou.Yang@atmel.com>
To: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>,
	"Ferre, Nicolas" <Nicolas.FERRE@atmel.com>,
	"linux@arm.linux.org.uk" <linux@arm.linux.org.uk>
Cc: "sylvain.rochet@finsecur.com" <sylvain.rochet@finsecur.com>,
	"Vilchez, Patrice" <Patrice.VILCHEZ@atmel.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"alexandre.belloni@free-electrons.com" 
	<alexandre.belloni@free-electrons.com>,
	"peda@axentia.se" <peda@axentia.se>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>
Subject: RE: [PATCH 2/7] pm: at91: pm_suspend: add the WFI support for ARMv7
Date: Tue, 27 Jan 2015 04:44:02 +0000	[thread overview]
Message-ID: <B256D81BAE5131468A838E5D7A243641BFD35CC6@penmbx01> (raw)
In-Reply-To: <54C63B8A.9000702@cogentembedded.com>

Hi Sergei,

Thank you for your review.

> -----Original Message-----
> From: Sergei Shtylyov [mailto:sergei.shtylyov@cogentembedded.com]
> Sent: Monday, January 26, 2015 9:05 PM
> To: Yang, Wenyou; Ferre, Nicolas; linux@arm.linux.org.uk
> Cc: sylvain.rochet@finsecur.com; Vilchez, Patrice; linux-kernel@vger.kernel.org;
> alexandre.belloni@free-electrons.com; peda@axentia.se; linux-arm-
> kernel@lists.infradead.org
> Subject: Re: [PATCH 2/7] pm: at91: pm_suspend: add the WFI support for ARMv7
> 
> Hello.
> 
> On 1/26/2015 1:06 PM, Wenyou Yang wrote:
> 
> > Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
> > ---
> >   arch/arm/mach-at91/pm_suspend.S |   54
> ++++++++++++++++++++++++++++++++++++++-
> >   1 file changed, 53 insertions(+), 1 deletion(-)
> 
> > diff --git a/arch/arm/mach-at91/pm_suspend.S
> > b/arch/arm/mach-at91/pm_suspend.S index 122a3f1..e796722 100644
> > --- a/arch/arm/mach-at91/pm_suspend.S
> > +++ b/arch/arm/mach-at91/pm_suspend.S
> > @@ -53,6 +53,58 @@ mode	.req	r6
> >   	beq	1b
> >   	.endm
> >
> > +/*
> > + * Put the processor to enter the WFI state  */
> > +	.macro _do_wfi
> > +
> > +#if defined(CONFIG_CPU_V7)
> > +	/*
> > +	 * Execute an ISB instruction to flush the pipeline to ensure
> > +	 * that all of operations have beem completed.
> 
>     Been.
> 
> > +	 */
> > +	isb
> > +
> > +	/*
> > +	 * Execute an ISB instruction to ensure that all of the
> 
>     ISB again, while you're executing DSB/DMB?
>
Thank you for your pointing.
 
> > +	 * CP15 register changes have been committed.
> > +	 */
> > +	dsb
> > +	dmb
> > +
> > +	/* Disable the processor's clock */
> > +	mov	tmp1, #AT91_PMC_PCK
> 
>     What's 'tmp1'? Is that a register name?
Yes, a register name defined at the head of file.

> 
> > +	str	tmp1, [pmc, #AT91_PMC_SCDR]
> > +
> > +	/* Execute a WFI instruction */
> 
>     Self-obvious comment, I'd say...
> 
> > +	wfi	@ Wait For Interrupt
> > +
> > +	/*
> > +	 * CPU can specualatively prefetch the instructions
> 
>     Speculatively.
Thanks.
> 
> [...]
> 
> WBR, Sergei


Best Regards,
Wenyou Yang

  reply	other threads:[~2015-01-27  4:44 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-26 10:03 [PATCH 0/7] AT91 pm improvements for 3.20 Wenyou Yang
2015-01-26 10:04 ` [PATCH 1/7] pm: at91: achieve the memory controller's type from the dts file Wenyou Yang
2015-01-26 10:06 ` [PATCH 2/7] pm: at91: pm_suspend: add the WFI support for ARMv7 Wenyou Yang
2015-01-26 13:05   ` Sergei Shtylyov
2015-01-27  4:44     ` Yang, Wenyou [this message]
2015-01-28 11:25   ` Lorenzo Pieralisi
2015-01-29  2:36     ` Yang, Wenyou
2015-01-29 12:22       ` Lorenzo Pieralisi
2015-01-30  7:23         ` Yang, Wenyou
2015-01-30 10:17           ` Lorenzo Pieralisi
2015-01-30 10:44           ` Lorenzo Pieralisi
2015-01-26 10:06 ` [PATCH 3/7] pm: at91: pm_suspend: MOR register KEY was missing Wenyou Yang
2015-01-26 10:07 ` [PATCH 4/7] ARM: at91: enable the L2 Cache controller Wenyou Yang
2015-01-26 11:46   ` Mark Rutland
2015-01-26 12:45   ` Russell King - ARM Linux
2015-01-26 22:36   ` Alexandre Belloni
2015-01-27  5:11     ` Yang, Wenyou
2015-01-26 10:07 ` [PATCH 5/7] pm: at91: add disable/enable the L1/L2 cache while suspend/resume Wenyou Yang
2015-01-26 10:08 ` [PATCH 6/7] pm: at91: add achieve the mpddrc peripheral ID and the DDR clock ID support Wenyou Yang
2015-01-26 11:49   ` Mark Rutland
2015-01-27  5:24     ` Yang, Wenyou
2015-01-26 10:08 ` [PATCH 7/7] pm: at91: add disable/enable the mpddrc's clock and DDR clock support Wenyou Yang

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=B256D81BAE5131468A838E5D7A243641BFD35CC6@penmbx01 \
    --to=wenyou.yang@atmel.com \
    --cc=Nicolas.FERRE@atmel.com \
    --cc=Patrice.VILCHEZ@atmel.com \
    --cc=alexandre.belloni@free-electrons.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux@arm.linux.org.uk \
    --cc=peda@axentia.se \
    --cc=sergei.shtylyov@cogentembedded.com \
    --cc=sylvain.rochet@finsecur.com \
    --subject='RE: [PATCH 2/7] pm: at91: pm_suspend: add the WFI support for ARMv7' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).