linux-kernel - Re: [PATCH 3/3] pm: at91: flush data cache and clean, invalidate and disable the L2 cache

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Date:	Tue, 17 Feb 2015 11:25:59 +0100
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Wenyou Yang <wenyou.yang@...el.com>
Cc:	nicolas.ferre@...el.com, linux@...im.org.za,
	linux@....linux.org.uk, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, sylvain.rochet@...secur.com,
	patrice.vilchez@...el.com, sergei.shtylyov@...entembedded.com,
	mark.rutland@....com, lorenzo.pieralisi@....com
Subject: Re: [PATCH 3/3] pm: at91: flush data cache and clean, invalidate and
 disable the L2 cache

On 12/02/2015 at 10:52:58 +0800, Wenyou Yang wrote :
> Flush data cache, and clean, invalidate and disable the L2 cache before going to suspend.
> Restore the L2 cache configuration and re-enable the L2 cache after waking up.
> 
> Signed-off-by: Wenyou Yang <wenyou.yang@...el.com>
Acked-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>

> ---
>  arch/arm/mach-at91/pm.c |    6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
> index 9075b41..2574bad 100644
> --- a/arch/arm/mach-at91/pm.c
> +++ b/arch/arm/mach-at91/pm.c
> @@ -30,6 +30,7 @@
>  #include <asm/mach/time.h>
>  #include <asm/mach/irq.h>
>  #include <asm/fncpy.h>
> +#include <asm/cacheflush.h>
>  
>  #include <mach/cpu.h>
>  #include <mach/hardware.h>
> @@ -145,8 +146,13 @@ static void at91_pm_suspend(suspend_state_t state)
>  	pm_data |= (state == PM_SUSPEND_MEM) ?
>  				AT91_PM_MODE(AT91_PM_SLOW_CLOCK) : 0;
>  
> +	flush_cache_all();
> +	outer_disable();
> +
>  	at91_suspend_sram_fn(at91_pmc_base, at91_ramc_base[0],
>  				at91_ramc_base[1], pm_data);
> +
> +	outer_resume();
>  }
>  
>  static int at91_pm_enter(suspend_state_t state)
> -- 
> 1.7.9.5
> 

-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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