Re: [PATCH 1/2] pwm: pca9685: fix period change with same duty cycle

[Mika Westerberg]

On Wed, Jan 18, 2017 at 11:56:50AM +0100, Thierry Reding wrote:
> On Tue, Dec 13, 2016 at 04:52:50PM +0100, Clemens Gruber wrote:
> > When first implementing support for changing the output frequency, an
> > optimization was added to continue the PWM after changing the prescaler
> > without having to reprogram the ON and OFF registers for the duty cycle,
> > in case the duty cycle stayed the same.
> > This was flawed, because we compared the absolute value of the duty
> > cycle in nanoseconds instead of the ratio to the period.
> > 
> > Fix the problem by removing the shortcut.
> > 
> > Fixes: 01ec8472009c9 ("pwm-pca9685: Support changing the output frequency")
> > Cc: <stable@xxxxxxxxxxxxxxx> # v4.3+
> > Signed-off-by: Clemens Gruber <clemens.gruber@xxxxxxxxxxxx>
> > ---
> >  drivers/pwm/pwm-pca9685.c | 11 -----------
> >  1 file changed, 11 deletions(-)
> 
> Mika, Andy, can you guys help review this and 2/2?

Looks good to me.

Reviewed-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>