[PATCH] ARM: EXYNOS: mcpm: Don't rely on firmware's secondary_cpu_start

[Doug Anderson]

Chander,

On Tue, Jun 10, 2014 at 9:52 PM, Chander Kashyap <k.chander at samsung.com> wrote:
> Hi Doug,
>
> On Tue, Jun 10, 2014 at 9:19 PM, Nicolas Pitre <nicolas.pitre at linaro.org> wrote:
>> On Tue, 10 Jun 2014, Doug Anderson wrote:
>>
>>> My S-state knowledge is not strong, but I believe that Lorenzo's
>>> questions matter if we're using S2 for CPUidle (where we actually turn
>>> off power and hot unplug CPUs) but not when we're using S1 for CPUidle
>>> (where we just enter WFI/WFE).
>>>
>
> No Its not plain WFI.
>
> All cores in Exynos5420 can be powered off independently.
> This functionality has been tested.
>
> Below is the link for the posted patches.
>
> https://lkml.org/lkml/2014/6/10/194
>
> And as Nicolas wrote, these patches need MCPM for that.

Most excellent!  I should have been more clear that I only knew about
how CPUidle worked in our local production kernel.  There I'm pretty
sure CPUidle is just WFI/WFE.  If you've got patches to do better then
that's great!

...can you confirm that my patch doesn't interfere with your improved
CPUidle?  It's been Acked by Nicolas (thanks!) so I'd imagine it will
land shortly.  Kukjin: I assume you'll be taking this?

-Doug