linux-kernel - Re: [V3 PATCH 2/2] ASoC: max98390: Added Amplifier Driver

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Date:   Wed, 13 May 2020 19:58:12 +0800
From:   Tzung-Bi Shih <tzungbi@...gle.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Steve Lee <steves.lee.maxim@...il.com>, jack.yu@...ltek.com,
        ALSA development <alsa-devel@...a-project.org>,
        ryan.lee.maxim@...il.com, ckeepax@...nsource.cirrus.com,
        ryans.lee@...imintegrated.com, steves.lee@...imintegrated.com,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Takashi Iwai <tiwai@...e.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>, nuno.sa@...log.com,
        geert@...ux-m68k.org, dmurphy@...com,
        Shuming [范書銘] <shumingf@...ltek.com>,
        Srini Kandagatla <srinivas.kandagatla@...aro.org>,
        rf@...nsource.wolfsonmicro.com
Subject: Re: [V3 PATCH 2/2] ASoC: max98390: Added Amplifier Driver

On Wed, May 13, 2020 at 6:53 PM Mark Brown <broonie@...nel.org> wrote:
>
> On Wed, May 13, 2020 at 04:45:23PM +0900, Steve Lee wrote:
>
> > Changes since V2:
> >       * Removed warn massage in max98390_dsm_calib_get func
> >         and add comment.
>
> The problem isn't the warning, the problem is that you have an empty
> operation.  You should either implement the function (eg, by caching the
> value written) or remove it and fix whatever problems you were running
> into further up the stack when it's missing.

The purpose for the mixer control is: to signal max98390 to start to
calibrate from userspace.
Thus,
max98390_dsm_calib_get() -> do nothing.
max98390_dsm_calib_put() -> call max98390_dsm_calibrate().