Re: [PATCH v4] ARM: perf: save/restore pmu registers in pm notifier

On Mon, Oct 20, 2014 at 10:16:16AM +0100, Sudeep Holla wrote:

On 20/10/14 09:46, Neil Zhang wrote:

quoted

Will, I prefer to check always-on field under PMU node to check
whether we need Save/restore them.

But how do you handle it for different idle states. e.g. if CPU is in
retention, PMU's *might be* retained. Also I don't think PMUs will be
placed in "always-on" power domain like timers. So using "always-on"
sounds incorrect to me.

Adding Mathieu to CC, since I spoke to him at LPC about this and he was
talking about implementing proper PM domain descriptions for coresight
components.

Will