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

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

[Yu-Hsuan Hsu]

The supported formats are S16_LE and S24_LE now. However, S24_LE is
not supported when TDM is 0 and it is not in the right justified mode.
We should remove 24-bit format in that situation to avoid triggering
error.

Signed-off-by: Yu-Hsuan Hsu <yuhsuan@chromium.org>
---
Changed the order of the conditional.
Remove the snd_pcm_hw_constraint_msbits function.
Use removing 24 bits format instead of fixing at 16 bits format.
 sound/soc/codecs/max98090.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/sound/soc/codecs/max98090.c b/sound/soc/codecs/max98090.c
index 7619ea31ab50..9fbb4c31bcf1 100644
--- a/sound/soc/codecs/max98090.c
+++ b/sound/soc/codecs/max98090.c
@@ -1909,6 +1909,24 @@ static int max98090_configure_dmic(struct max98090_priv *max98090,
 	return 0;
 }
 
+static int max98090_dai_startup(struct snd_pcm_substream *substream,
+				struct snd_soc_dai *dai)
+{
+	struct snd_soc_component *component = dai->component;
+	struct max98090_priv *max98090 = snd_soc_component_get_drvdata(component);
+	unsigned int fmt = max98090->dai_fmt;
+
+	/*
+	 * 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;
+
+	return 0;
+}
+
 static int max98090_dai_hw_params(struct snd_pcm_substream *substream,
 				   struct snd_pcm_hw_params *params,
 				   struct snd_soc_dai *dai)
@@ -2316,6 +2334,7 @@ EXPORT_SYMBOL_GPL(max98090_mic_detect);
 #define MAX98090_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE)
 
 static const struct snd_soc_dai_ops max98090_dai_ops = {
+	.startup = max98090_dai_startup,
 	.set_sysclk = max98090_dai_set_sysclk,
 	.set_fmt = max98090_dai_set_fmt,
 	.set_tdm_slot = max98090_set_tdm_slot,
-- 
2.22.0.410.gd8fdbe21b5-goog

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

[Mark Brown]

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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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