linux-kernel - Re: [PATCH v3 12/16] ASoC: tegra: Fix kcontrol put callback in MVC

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Date:   Thu, 18 Nov 2021 13:49:49 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     Sameer Pujar <spujar@...dia.com>, lgirdwood@...il.com,
        perex@...ex.cz, tiwai@...e.com, thierry.reding@...il.com,
        jonathanh@...dia.com, alsa-devel@...a-project.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 12/16] ASoC: tegra: Fix kcontrol put callback in MVC

On Thu, Nov 18, 2021 at 02:32:07PM +0100, Takashi Iwai wrote:
> Sameer Pujar wrote:

> > +	old_mask = (value >> TEGRA210_MVC_MUTE_SHIFT) & TEGRA210_MUTE_MASK_EN;
> > +	new_mask = ucontrol->value.integer.value[0];
> > +
> > +	if (new_mask == old_mask) {
> > +		err = 0;
> > +		goto end;
> > +	}
> >  
> >  	err = regmap_update_bits(mvc->regmap, mc->reg,
> >  				 TEGRA210_MVC_MUTE_MASK,
> > -				 mute_mask << TEGRA210_MVC_MUTE_SHIFT);
> > +				 new_mask << TEGRA210_MVC_MUTE_SHIFT);

> I guess this test-and-update procedure can be simplified with
> regmap_update_bits_check().

Yes, this is exactly the application that _update_bits_check() was
written for.

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