linux-kernel - Re: regulator: BD71837 PMIC resume during noirq phase?

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Message-ID: <dda3847e74ddbcde86342210e44247973a24e5f6.camel@puri.sm>
Date:   Mon, 11 Jul 2022 11:52:10 +0200
From:   Martin Kepplinger <martin.kepplinger@...i.sm>
To:     Mark Brown <broonie@...nel.org>
Cc:     matti.vaittinen@...rohmeurope.com, lgirdwood@...il.com,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        arm-soc <linux-arm-kernel@...ts.infradead.org>,
        Pengutronix Kernel Team <kernel@...gutronix.de>
Subject: Re: regulator: BD71837 PMIC resume during noirq phase?

Am Dienstag, dem 14.06.2022 um 11:16 +0100 schrieb Mark Brown:
> On Tue, Jun 14, 2022 at 11:57:18AM +0200, Martin Kepplinger wrote:
> > Am Dienstag, dem 14.06.2022 um 10:18 +0100 schrieb Mark Brown:
> 
> > > Indeed - if a power domain is controlling regulators then I'd not
> > > expect
> > > things to go well if it tries to resume without interrupts, there
> > > will
> > > be some things that can be done purely with GPIOs but that's
> > > depending
> > > on the hardware having wired things up that way and the
> > > operations
> > > needed by the power domain mapping well onto what can be done
> > > with
> > > GPIOs.
> > 
> > and what's the danger when resuming power domains later?:
> 
> If there's a device that needs to early resume in a power domain that
> needs to do something on resume then presumably this will mess up the
> ordering.  You probably need a separate power domain type, or both
> operations.

hi Mark, the followup to this would be my first try to fix this:

https://lore.kernel.org/linux-arm-kernel/20220711094549.3445566-1-martin.kepplinger@puri.sm/T/#t

thank you for you help so far,

                             martin