On Thu, 2012-11-01 at 05:19 +0800, Colin Cross wrote:

On Wed, Oct 31, 2012 at 2:41 AM, Joseph Lo [off-list ref] wrote:

quoted

This supports power-gated idle on secondary CPUs for Tegra30. The
secondary CPUs can go into powered-down state independently. When
CPU goes into this state, it saves it's contexts and puts itself
to flow controlled WFI state. After that, it will been power gated.

Be aware of that, you may see the legacy power state "LP2" in the
code which is exactly the same meaning of "CPU power down".

On Tegra20, LP2 included powering off the GIC.  Is that still the case
for Tegra30 individual secondary cpu power gating?  If so, how do IPIs
to an idle cpu wake it up?

Hi Colin,

Thanks for your review.
For Tegra30, the LP2 of secondary CPU didn't power gate GIC. Only when 4
cores in LP2, the power of cpu cluster will be shut off that include
GIC. For the LP2 of individual secondary CPU, it can be woke up by IPI.

Thanks,
Joseph