linux-kernel - Re: [PATCH 2/3] cpuidle/powernv: Enable idle powernv cpu to call into the cpuidle framework.

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Message-ID: <51F35AC7.8060909@linaro.org>
Date:	Sat, 27 Jul 2013 07:29:43 +0200
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Deepthi Dharwar <deepthi@...ux.vnet.ibm.com>
CC:	linuxppc-dev@...ts.ozlabs.org, benh@...nel.crashing.org,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] cpuidle/powernv: Enable idle powernv cpu to call
 into the cpuidle framework.

On 07/23/2013 11:01 AM, Deepthi Dharwar wrote:
> This patch enables idle powernv cpu to hook on to the cpuidle
> framework, if available, else call on to default idle platform
> code.

Why do you need to do that ?


> Signed-off-by: Deepthi Dharwar <deepthi@...ux.vnet.ibm.com>
> ---
>  arch/powerpc/platforms/powernv/setup.c |   12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c
> index 84438af..97d0951 100644
> --- a/arch/powerpc/platforms/powernv/setup.c
> +++ b/arch/powerpc/platforms/powernv/setup.c
> @@ -25,6 +25,7 @@
>  #include <linux/of.h>
>  #include <linux/interrupt.h>
>  #include <linux/bug.h>
> +#include <linux/cpuidle.h>
>  
>  #include <asm/machdep.h>
>  #include <asm/firmware.h>
> @@ -196,6 +197,15 @@ static int __init pnv_probe(void)
>  	return 1;
>  }
>  
> +void powernv_idle(void)
> +{
> +	/* Hook to cpuidle framework if available, else
> +	 * call on default platform idle code
> +	 */
> +	if (cpuidle_idle_call())
> +		power7_idle();
> +}
> +
>  define_machine(powernv) {
>  	.name			= "PowerNV",
>  	.probe			= pnv_probe,
> @@ -205,7 +215,7 @@ define_machine(powernv) {
>  	.show_cpuinfo		= pnv_show_cpuinfo,
>  	.progress		= pnv_progress,
>  	.machine_shutdown	= pnv_shutdown,
> -	.power_save             = power7_idle,
> +	.power_save             = powernv_idle,
>  	.calibrate_decr		= generic_calibrate_decr,
>  #ifdef CONFIG_KEXEC
>  	.kexec_cpu_down		= pnv_kexec_cpu_down,
> 
> --
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