linux-kernel - Re: [PATCH v6 07/11] powerpc/powernv: set power_save func after the idle states are initialized

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Date:	Wed, 22 Jun 2016 15:11:27 +1000
From:	Michael Neuling <mikey@...ling.org>
To:	benh@....ibm.com, "Shreyas B. Prabhu" <shreyas@...ux.vnet.ibm.com>,
	mpe@...erman.id.au
Cc:	ego@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	maddy@...ux.vnet.ibm.com, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v6 07/11] powerpc/powernv: set power_save func after the
 idle states are initialized

On Wed, 2016-06-22 at 11:54 +1000, Benjamin Herrenschmidt wrote:
> On Wed, 2016-06-08 at 11:54 -0500, Shreyas B. Prabhu wrote:
> > 
> > pnv_init_idle_states discovers supported idle states from the
> > device tree and does the required initialization. Set power_save
> > function pointer only after this initialization is done
> > 
> > Reviewed-by: Gautham R. Shenoy <ego@...ux.vnet.ibm.com>
> > Signed-off-by: Shreyas B. Prabhu <shreyas@...ux.vnet.ibm.com>
> Acked-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> 
> Please merge that one as-is now, no need to wait for the rest, as
> otherwise pwoer9 crashes at boot. It doesn't need to wait for the
> rest of the series.

Acked-by: Michael Neuling <mikey@...ling.org>

For the same reason. Without this we need powersave=off on the cmdline on
POWER9.

Mikey

> 
> Cheers,
> Ben.
> 
> > 
> > ---
> > - No changes since v1
> > 
> >  arch/powerpc/platforms/powernv/idle.c  | 3 +++
> >  arch/powerpc/platforms/powernv/setup.c | 2 +-
> >  2 files changed, 4 insertions(+), 1 deletion(-)
> > 
> > diff --git a/arch/powerpc/platforms/powernv/idle.c
> > b/arch/powerpc/platforms/powernv/idle.c
> > index fcc8b68..fbb09fb 100644
> > --- a/arch/powerpc/platforms/powernv/idle.c
> > +++ b/arch/powerpc/platforms/powernv/idle.c
> > @@ -285,6 +285,9 @@ static int __init pnv_init_idle_states(void)
> >  	}
> >  
> >  	pnv_alloc_idle_core_states();
> > +
> > +	if (supported_cpuidle_states & OPAL_PM_NAP_ENABLED)
> > +		ppc_md.power_save = power7_idle;
> >  out_free:
> >  	kfree(flags);
> >  out:
> > diff --git a/arch/powerpc/platforms/powernv/setup.c
> > b/arch/powerpc/platforms/powernv/setup.c
> > index ee6430b..8492bbb 100644
> > --- a/arch/powerpc/platforms/powernv/setup.c
> > +++ b/arch/powerpc/platforms/powernv/setup.c
> > @@ -315,7 +315,7 @@ define_machine(powernv) {
> >  	.get_proc_freq          = pnv_get_proc_freq,
> >  	.progress		= pnv_progress,
> >  	.machine_shutdown	= pnv_shutdown,
> > -	.power_save             = power7_idle,
> > +	.power_save             = NULL,
> >  	.calibrate_decr		= generic_calibrate_decr,
> >  #ifdef CONFIG_KEXEC
> >  	.kexec_cpu_down		= pnv_kexec_cpu_down,