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

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Date:   Wed, 13 May 2020 13:05:32 +0900
From:   Steve Lee <steves.lee.maxim@...il.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, ckeepax@...nsource.cirrus.com,
        geert@...ux-m68k.org, rf@...nsource.wolfsonmicro.com,
        Shuming [范書銘] <shumingf@...ltek.com>,
        Srini Kandagatla <srinivas.kandagatla@...aro.org>,
        Krzysztof Kozlowski <krzk@...nel.org>, dmurphy@...com,
        jack.yu@...ltek.com, nuno.sa@...log.com,
        steves.lee@...imintegrated.com,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ALSA development <alsa-devel@...a-project.org>,
        ryan.lee.maxim@...il.com
Subject: Re: [PATCH 2/2] ASoC: max98390: Added Amplifier Driver

On Tue, May 12, 2020 at 7:33 PM Mark Brown <broonie@...nel.org> wrote:
>
> On Tue, May 12, 2020 at 06:13:05PM +0900, Steve Lee wrote:
> > On Mon, May 11, 2020 at 8:03 PM Mark Brown <broonie@...nel.org> wrote:
>
> > > > +static const char * const max98390_current_limit_text[] = {
> > > > +     "0.00A", "0.50A", "1.00A", "1.05A", "1.10A", "1.15A", "1.20A", "1.25A",
> > > > +     "1.30A", "1.35A", "1.40A", "1.45A", "1.50A", "1.55A", "1.60A", "1.65A",
>
> > > This looks like it should be in DT too.
>
> > Since this control  is needed while running system according to system
> > battery situation.
> > I'd keep this mixer for further use.
>
> That's...  interesting for a current limit, and sounds like it would
> have issues for the common case use of current limits to protect the
> hardware.
>
> > > > +static int max98390_dsm_calib_get(struct snd_kcontrol *kcontrol,
> > > > +             struct snd_ctl_elem_value *ucontrol)
> > > > +{
> > > > +     struct snd_soc_component *component =
> > > > +             snd_soc_kcontrol_component(kcontrol);
> > > > +
> > > > +     dev_warn(component->dev, "Get dsm_calib_get not supported\n");
> > > > +
> > > > +     return 0;
> > > > +}
>
> > > Just don't implement the operation if you can't implement it.
>
> > If this not exist as dummy operation and all mixer was not working and
> > could not implement better idea.
>
> Could you be more specific about what you mean by "not working" or how
> simply not initializing the value returned fixes things please?
I mean that xhandler_get pointing to NULL makes mixer list unexpected operation.
I will do return fixed value without warn message.
>
> > Could you consider it as with warn message ?
>
> No, if there's a problem here we should fix it properly.
Thanks for feed back.I will do return fixed value without warn message.