Re: [PATCH V2 5/6] PM / domain: Save/restore performance state at runtime suspend/resume
From: Viresh Kumar
Date: Mon Feb 20 2017 - 04:28:13 EST
On 17-02-17, 15:58, Kevin Hilman wrote:
> Viresh Kumar <viresh.kumar@xxxxxxxxxx> writes:
> > With runtime PM, the devices get suspended while the system is up and
> > running in order to save power. At such times, it is important to
> > re-evaluate the required performance state of the domain, in order to
> > choose a lower state if possible.
> > This patch updates the genpd suspend/resume callbacks to do that.
> > Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
> Doesn't this assume that a device in the domain would need to change
> performance state while runtime suspended. How would that happen?
> Rather than adding this here, I would think that drivers would instead
> remove any QoS requests before going into runtime suspend, which would
> trigger an update before runtime suspending.
Okay, lets leave it for the drivers, at least for the time being. I
will drop this patch.