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

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Date:	Wed, 28 Jan 2015 13:09:15 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Wenyou Yang <wenyou.yang@...el.com>, nicolas.ferre@...el.com,
	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.

> +	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

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