linux-kernel - Re: [PATCH] ASoC: pcm512x: Mend accesses to the I2S_1 and I2S

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Date:   Tue, 21 Sep 2021 13:01:13 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Peter Rosin <peda@...ntia.se>
Cc:     Péter Ujfalusi <peter.ujfalusi@...il.com>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Takashi Iwai <tiwai@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Kirill Marinushkin <kmarinushkin@...dec.com>
Subject: Re: [PATCH] ASoC: pcm512x: Mend accesses to the I2S_1 and I2S_2
 registers

On Tue, Sep 21, 2021 at 10:48:01AM +0200, Peter Rosin wrote:
> On 2021-09-21 10:10, Peter Rosin wrote:

> Ok, so the attached works for me as well. But I don't know if it's
> appropriate to resume/suspend like that?

> is:
> 
> pcm512x 0-004c: Failed to set data format: -16
> 
> The root cause is that the chip is in Powerdown mode when
> pcm512x_set_fmt runs. So, bring the chip out of suspend for
> the update of the format.

How would this work if the device looses power while in suspend (eg, due
to the regulators being software controllable)?  If the data isn't being
stored in the cache then it'll need to be stored somewhere else and
restored on resume.

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