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SubjectRe: [PATCH] ASoC: rt5651: use msleep for large delays
On Wed, Jan 11, 2017 at 02:59:26PM +0000, Mark Brown wrote:
> On Wed, Jan 11, 2017 at 12:49:36PM +0100, Nicholas Mc Guire wrote:
>
> > if (!rt5651->hp_mute)
> > - usleep_range(80000, 85000);
> > + msleep(85);
>
> If you're doing conversions like this I'd expect us to be picking the
> lower number rather than the higher number - people are saying "wait for
> at least X and at most Y" and msleep() is "wait for at least X" so we
> should be picking X.

useleep_range() sets the timer to max and only if there happens to be a
timer between min and max uses that - so the mean of runs is generally
a bit above max. E.g.

usleep_range(*,200) 5000 samples - idle system
100,200 190,200
Min. :188481 Min. :197793
1st Qu.:207062 1st Qu.:207051
Median :207139 Median :207133
Mean :207254 Mean :207244
3rd Qu.:207341 3rd Qu.:207610
Max. :225340 Max. :214885

So to keep the behavior as close to the current code as possible
it seemed better to select the upper value.

Am I missing something ?

thx!
hofrat

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