Re: [RFC/PATCH 4/6] ARM: shmobile: r8a7791: Add Core-Standby CPUIdle support for r8a7791

[Daniel Lezcano <daniel.lezcano@linaro.org>]

On 03/04/2015 05:55 AM, Keita Kobayashi wrote:
> This patch Add the wfi and Core-Standby for CPUIdle power states
> support for the r8a7791 SoC.
>
> Signed-off-by: Keita Kobayashi <keita.kobayashi.ym@renesas.com>
> ---
>   arch/arm/mach-shmobile/pm-r8a7791.c | 41 +++++++++++++++++++++++++++++++++++++
>   1 file changed, 41 insertions(+)
>
> diff --git a/arch/arm/mach-shmobile/pm-r8a7791.c b/arch/arm/mach-shmobile/pm-r8a7791.c
> index 25f107b..6c00d37 100644
> --- a/arch/arm/mach-shmobile/pm-r8a7791.c
> +++ b/arch/arm/mach-shmobile/pm-r8a7791.c
> @@ -10,8 +10,13 @@
>    * for more details.
>    */
>
> +#include <linux/cpuidle.h>
>   #include <linux/kernel.h>
>   #include <linux/smp.h>
> +#include <linux/platform_data/renesas-cpuidle.h>
> +#include <linux/pm.h>
> +#include <asm/cpuidle.h>
> +#include <asm/cputype.h>
>   #include <asm/io.h>
>   #include "common.h"
>   #include "pm-rcar.h"
> @@ -43,6 +48,41 @@ static inline void r8a7791_sysc_init(void) {}
>
>   #endif /* CONFIG_SMP */
>
> +#ifdef CONFIG_ARM_RENESAS_CPUIDLE
> +static struct cpuidle_driver r8a7791_cpuidle_driver = {
> +	.name = "rcar_r8a7791_cpuidle",
> +	.owner = THIS_MODULE,
> +	.states = {
> +		[0] = ARM_CPUIDLE_WFI_STATE,
> +		[1] = {
> +			.name = "Core-Standby",
> +			.desc = "Core Standby Mode",
> +			.exit_latency = 2800,
> +			.target_residency = 2800,
> +			.enter = shmobile_smp_apmu_enter_cpuidle,
> +		},
> +	},
> +	.state_count = 2,
> +};

It would be nice to have the code self contained. I am pretty sure this 
possible to have the cpuidle bits into drivers/cpuidle and the low level 
pm code here.

> +static struct renesas_cpuidle_driver r8a7791_cpuidle = {
> +	.target_cpu	= ARM_CPU_PART_CORTEX_A15,
> +	.renesas_drv	= &r8a7791_cpuidle_driver,
> +};
> +
> +static struct renesas_cpuidle r8a7791_data = {
> +	.num_drvs	= 1,
> +	.rcd		= &r8a7791_cpuidle,
> +};
> +
> +static void __init r8a7791_cpuidle_init(void)
> +{
> +	shmobile_cpuidle_set_driver(&r8a7791_data);
> +}
> +#else
> +static void __init r8a7791_cpuidle_init(void) {}
> +#endif
> +
>   void __init r8a7791_pm_init(void)
>   {
>   	void __iomem *p;
> @@ -70,4 +110,5 @@ void __init r8a7791_pm_init(void)
>
>   	r8a7791_sysc_init();
>   	shmobile_smp_apmu_suspend_init();
> +	r8a7791_cpuidle_init();
>   }
>


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