> -----Original Message----- > From: Will Deacon [mailto:will.deacon@xxxxxxx] > Sent: 2014年10月20日 17:20 > To: Sudeep Holla > Cc: Neil Zhang; 'linux@xxxxxxxxxxxxxxxx'; 'linux-arm- > kernel@xxxxxxxxxxxxxxxxxxx'; 'linux-kernel@xxxxxxxxxxxxxxx'; > 'devicetree@xxxxxxxxxxxxxxx'; mathieu.poirier@xxxxxxxxxx > Subject: 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: > > > 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. > Good to know that! Hope we can figure out it with a proper way. > Will Best Regards, Neil Zhang ?韬{.n?????%??檩??w?{.n????z谵{???塄}?财??j:+v?? ? ???2??璀??摺?囤??z夸z罐?+?????w棹f
