[PATCH] pwm: sun4i: Avoid waiting until the next period

[Alexandre Belloni]

Hi,

On 27/05/2021 14:10:35+0200, Roman Beranek wrote:
> Hello Thierry,
> 
> On Tue May 25, 2021 at 6:41 PM CEST, Thierry Reding wrote:
> > I'm pretty sure Alexandre at the time reported that the instantiation of
> > the controller that he was using required waiting for the period to
> > complete before the output went to the disabled state. It's possible
> > that this was changed in subsequent versions of the IP, so perhaps we
> > need to distinguish based on compatible string?
> 

I can't recall what I tested exactly. I probably assumed it would take
the whole period to update because this is how it is working on v1 of
the atmel PWM and this is what I was working on at the time. I did test
on a CHIP. I guess linux-sunxi.org is more correct than I was at the
time.

> I've got myself an A10 (sun4i) board to test my new patchset with and
> indeed the 2 cycles seem to be enough.
> 
> I have yet to write a cover letter for it though, expect it by Monday
> at the latest.
> 
> Best regards,
> Roman

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com