[PATCH v4 5/5] arm: exynos: Add MCPM call-back functions

[Nicolas Pitre]

On Fri, 2 May 2014, Andrew Bresticker wrote:

> >> +     /*
> >> +      * TODO: Turn off the clusters when all cores in the cluster
> >> +      * are down to achieve significant power savings.
> >> +      */
> >
> > This comment should actually be located right after the
> > "if (exynos_cluster_unused(cluster))" above.  That is where the cluster
> > control should be applied, assuming it'll be effective only when WFI is
> > executed.
> 
> Correct me if I'm wrong Samsung folks, but I thought it was not
> possible to apply cluster power control from a CPU within the cluster
> being powered down, i.e. a CPU in the other cluster must be the one to
> apply the cluster power control to power down the outbound cluster.

Is this true even for deep idle C-states?


Nicolas