linux-kernel - Re: [PATCH] tty: max310x: work around regmap->regcache data corruption

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Message-ID: <26710a0a-4390-4056-8734-812480346b6c@sirena.org.uk>
Date:   Mon, 4 Dec 2023 22:09:45 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Hugo Villeneuve <hugo@...ovil.com>
Cc:     Jan Kundrát <jan.kundrat@...net.cz>,
        Cosmin Tanislav <cosmin.tanislav@...log.com>,
        linux-serial@...r.kernel.org,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tty: max310x: work around regmap->regcache data
 corruption

On Mon, Dec 04, 2023 at 03:02:24PM -0500, Hugo Villeneuve wrote:
> Mark Brown <broonie@...nel.org> wrote:

> > This is truly innovative hardware,...

> Well, I would not say innovative, but more "crappy" hardware design :)

I didn't say it was *good* innovation.

> >  You'd need to extend the core
> > so that it knows about this quirk, right now that's not possible and
> > we'll just leave the window pointing at whatever was last accessed.

> Ok. I am not sure that adding support for it would make sense, since I
> do not know of other ICs that could reuse this very specific and
> particular method for switching "paged" registers.

Yeah, I'm drawing a blank there.  The thing that springs to mind is
optimisation with wanting to always be on a particular page for fast
interrupt handling or something but that feels rather thin.

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