linux-kernel - Re: [PATCH v6] ASoC: max98090: remove 24-bit format support if RJ is 0

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Date:   Tue, 2 Jul 2019 14:55:45 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Yu-Hsuan Hsu <yuhsuan@...omium.org>
Cc:     linux-kernel@...r.kernel.org, Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Jon Hunter <jonathanh@...dia.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        alsa-devel@...a-project.org, Liam Girdwood <lgirdwood@...il.com>,
        dgreid@...omium.org, cychiang@...omium.org
Subject: Re: [PATCH v6] ASoC: max98090: remove 24-bit format support if RJ is
 0

On Tue, Jun 18, 2019 at 10:24:11AM +0800, Yu-Hsuan Hsu wrote:

> +	/*
> +	 * When TDM = 0, remove 24-bit format support if it is not in right
> +	 * justified mode.
> +	 */
> +	if ((fmt & SND_SOC_DAIFMT_FORMAT_MASK) != SND_SOC_DAIFMT_RIGHT_J &&
> +			!max98090->tdm_slots)
> +		substream->runtime->hw.formats &= ~SNDRV_PCM_FMTBIT_S24_LE;

Why do this and not add a constraint (which doesn't modify any
constant data structures)?

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