Re: [PATCH v2] clocksource: atmel-pit: register as a sched_clock

From: Sylvain Rochet
Date: Wed Feb 24 2016 - 11:41:00 EST


On Wed, Feb 24, 2016 at 05:04:42PM +0100, Romain Izard wrote:
> Register the counter of the Periodic Interval Timer as a possible source
> for sched_clock. Keep the timer running even if the related clockevent
> is disabled.
> This provides a better precision than the jiffies-based default. The
> TCB clocksource does not work, as it is registered too late in the
> initialization sequence.

I have mixed feelings about that, but this is probably just a
misunderstanding from my part.

The PIT timer should not be used for systems with PM_SUSPEND enabled and
used because it takes ages to synchronize on resume, how does this patch
affect that ?

Ref: commit ac34ad27fc ("clockevents: Do not suspend/resume if unused")