Re: [PATCH AUTOSEL 4.14 05/15] regulator: pwm: Fix machine constraints application

[Sasha Levin]

On Tue, Sep 15, 2020 at 09:55:08AM +0200, Vincent Whitchurch wrote:
> On Mon, Sep 14, 2020 at 03:05:16PM +0200, Sasha Levin wrote:
> > From: Vincent Whitchurch <vincent.whitchurch@xxxxxxxx>
> >
> > [ Upstream commit 59ae97a7a9e1499c2070e29841d1c4be4ae2994a ]
> >
> > If the zero duty cycle doesn't correspond to any voltage in the voltage
> > table, the PWM regulator returns an -EINVAL from get_voltage_sel() which
> > results in the core erroring out with a "failed to get the current
> > voltage" and ending up not applying the machine constraints.
> >
> > Instead, return -ENOTRECOVERABLE which makes the core set the voltage
> > since it's at an unknown value.
>
> For this patch to work it needs 84b3a7c9c6befe5ab4d49070fe7 ("regulator:
> core: Allow for regulators that can't be read at bootup") which was
> merged in v4.18.  Without that this patch is not going to have any
> effect so it probably shouldn't be backported to older kernels.

Dropped for those older kernels, thanks!

--
Thanks,
Sasha