linux-kernel - Re: [PATCH v9 1/8] pwm: pca9685: Switch to atomic API

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Message-ID: <YIFgVZL4PBcIKvMp@workstation.tuxnet>
Date:   Thu, 22 Apr 2021 13:39:01 +0200
From:   Clemens Gruber <clemens.gruber@...ruber.com>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     linux-pwm@...r.kernel.org,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Sven Van Asbroeck <TheSven73@...il.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 1/8] pwm: pca9685: Switch to atomic API

On Sat, Apr 17, 2021 at 09:51:50PM +0200, Uwe Kleine-König wrote:
> On Thu, Apr 15, 2021 at 02:14:48PM +0200, Clemens Gruber wrote:
> > The switch to the atomic API goes hand in hand with a few fixes to
> > previously experienced issues:
> > - The duty cycle is no longer lost after disable/enable (previously the
> >   OFF registers were cleared in disable and the user was required to
> >   call config to restore the duty cycle settings)
> > - If one sets a period resulting in the same prescale register value,
> >   the sleep and write to the register is now skipped
> > - Previously, only the full ON bit was toggled in GPIO mode (and full
> >   OFF cleared if set to high), which could result in both full OFF and
> >   full ON not being set and on=0, off=0, which is not allowed according
> >   to the datasheet
> > - The OFF registers were reset to 0 in probe, which could lead to the
> >   forbidden on=0, off=0. Fixed by resetting to POR default (full OFF)
> > 
> > Signed-off-by: Clemens Gruber <clemens.gruber@...ruber.com>
> 
> (I sent my ack to v8 before, but indeed this was the version I intended
> to ack)
> 
> Acked-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>

Thierry: Do you think we can get patches 1 to 3 into 5.13-rc1?

Thanks,
Clemens