linux-kernel - Re: PM regression in next

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Message-ID: <20180112225947.GL21458@sirena.org.uk>
Date:   Fri, 12 Jan 2018 22:59:47 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Tony Lindgren <tony@...mide.com>
Cc:     Peter Ujfalusi <peter.ujfalusi@...com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-omap@...r.kernel.org,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        linux-pm@...r.kernel.org
Subject: Re: PM regression in next

On Fri, Jan 12, 2018 at 02:49:59PM -0800, Tony Lindgren wrote:
> * Mark Brown <broonie@...nel.org> [180112 22:11]:

> > Most devices have one regmap per device which can be retrieved with
> > dev_get_regmap(), it's the attempt to use that which I suspect is
> > broken.  Like I said snd_soc_codec_init_regmap() ought to fix things if
> > that's the issue.

> OK. Adding Peter to loop as it's his driver after all. Not sure
> how well mixing regmap register access to the same module with
> cached twl4030_read() would work :)

Yes, that local cache is not a super good idea any more and hopefully
redundant.

> Maybe there should also be some big warning happening if
> snd_soc_codec_init_regmap() is now needed and no regmap is
> found?

Some devices just plain don't have registers at all (perhaps GPIOs or
just stub drivers providing capability information).  However we should
be screaming loudly about the fact that the I/O we tried to do fails,
that clearly shouldn't be being ignored.

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