Subject: Re: powerpc/powernv/idle: Round up latency and residency values

From: Michael Ellerman <[email-masked]>
Date: Tue, 14 Nov 2017 22:12:00 +1100 (AEDT)

On Wed, 2017-08-23 at 18:58:41 UTC, Vaidyanathan Srinivasan wrote:
> On PowerNV platforms, firmware provides exit latency and
> target residency for each of the idle states in nano
> seconds.  Cpuidle framework expects the values in micro
> seconds.  Round up to nearest micro seconds to avoid errors
> in cases where the values are defined as fractional micro
> seconds.
> 
> Default idle state of 'snooze' has exit latency of zero.  If
> other states have fractional micro second exit latency, they
> would get rounded down to zero micro second and make cpuidle
> framework choose deeper idle state when snooze loop is the
> right choice.
> 
> Reported-by: Anton Blanchard <[email-masked]>
> Signed-off-by: Vaidyanathan Srinivasan <[email-masked]>
> Reviewed-by: Gautham R. Shenoy <[email-masked]>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/8d4e10e9ed9450e18fbbf6a8872be0

cheers