[PATCH 03/14] powerpc/64s: idle provide a default idle for POWER9

[Gautham R Shenoy]

Hi Nick,

On Mon, Jun 12, 2017 at 09:58:24AM +1000, Nicholas Piggin wrote:
> Before the cpuidle driver is enabled, provide a default idle
> function similarly to POWER7/8.
> 
> This should not have much effect, because the cpuidle driver
> for powernv is mandatory, but if that changes we should have
> a fallback.
> 
> Signed-off-by: Nicholas Piggin <npiggin at gmail.com>
> ---
>  arch/powerpc/platforms/powernv/idle.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/powerpc/platforms/powernv/idle.c b/arch/powerpc/platforms/powernv/idle.c
> index f188d84d9c59..e327e1585ddc 100644
> --- a/arch/powerpc/platforms/powernv/idle.c
> +++ b/arch/powerpc/platforms/powernv/idle.c
> @@ -677,6 +677,8 @@ static int __init pnv_init_idle_states(void)
> 
>  	if (supported_cpuidle_states & OPAL_PM_NAP_ENABLED)
>  		ppc_md.power_save = power7_idle;
> +	else if (supported_cpuidle_states & OPAL_PM_STOP_INST_FAST)
> +		ppc_md.power_save = power9_idle;

We are already initializing this in pnv_power9_idle_init() depending
on whether the device tree has exposed at least one INST_FAST idle
state. Else this should be NULL, because the firmware doesn't want us
to use a platform idle state!


> 
>  out:
>  	return 0;
> -- 
> 2.11.0
>