[PATCH] at91: cpuidle: Fix target_residency

[Nicolas Ferre]

On 21/06/2013 14:36, Daniel Lezcano :
> The following commit:
>
> commit 7e348b9012522fa0efd854d20d210d5e57fcedd1
> Author: Robert Lee <rob.lee at linaro.org>
> Date:   Tue Mar 20 15:22:43 2012 -0500
>
>      ARM: at91: Consolidate time keeping and irq enable
>
>      Enable core cpuidle timekeeping and irq enabling and remove that
>      handling from this code.
>
> introduced a zero to the state1 (suspend) target residency.
>
> [ ... ]
>
> +       .states[1]              = {
> +               .enter                  = at91_enter_idle,
> +               .exit_latency           = 10,
> +               .target_residency       = 100000,
> +               .flags                  = CPUIDLE_FLAG_TIME_VALID,
> +               .name                   = "RAM_SR",
> +               .desc                   = "WFI and DDR Self Refresh",
> +       },
>
> [ ... ]
>
> -       /* Wait for interrupt and RAM self refresh state */
> -       driver->states[1].enter = at91_enter_idle;
> -       driver->states[1].exit_latency = 10;
> -       driver->states[1].target_residency = 10000;
> -       driver->states[1].flags = CPUIDLE_FLAG_TIME_VALID;
> -       strcpy(driver->states[1].name, "RAM_SR");
> -       strcpy(driver->states[1].desc, "WFI and RAM Self Refresh");
>
> [ ... ]
>
> The cpuidle never enters this state since this commit.
>
> Fix it by setting the value to 10ms again.
>
> Signed-off-by: Daniel Lezcano <daniel.lezcano at linaro.org>

Acked-by: Nicolas Ferre <nicolas.ferre at atmel.com>

> ---
>   arch/arm/mach-at91/cpuidle.c |    2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm/mach-at91/cpuidle.c b/arch/arm/mach-at91/cpuidle.c
> index 69f9e3b..4ec6a6d 100644
> --- a/arch/arm/mach-at91/cpuidle.c
> +++ b/arch/arm/mach-at91/cpuidle.c
> @@ -51,7 +51,7 @@ static struct cpuidle_driver at91_idle_driver = {
>   	.states[1]		= {
>   		.enter			= at91_enter_idle,
>   		.exit_latency		= 10,
> -		.target_residency	= 100000,
> +		.target_residency	= 10000,
>   		.flags			= CPUIDLE_FLAG_TIME_VALID,
>   		.name			= "RAM_SR",
>   		.desc			= "WFI and DDR Self Refresh",
>


-- 
Nicolas Ferre