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

On Fri, 2 May 2014, Andrew Bresticker wrote:

quoted

quoted

+     /*
+      * 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