ASoC: pcm3168a: Use fixup instead of constraint for channels and formats

The snd_pcm_hw_constraint_minmax() works fine when a single codec is
connected to a single CPU DAI, but in multicodec or DPCM setup the
constraints placed by the driver will apply to the whole PCM stream (FE
included) and thus prevents more than 8 playback channels for example.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20191008115720.7135-1-peter.ujfalusi@ti.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/pcm3168a.c

@@ -62,6 +62,7 @@ struct pcm3168a_priv {
 	unsigned long sysclk;
 
 	struct pcm3168a_io_params io_params[2];
+	struct snd_soc_dai_driver dai_drv[2];
 };
 
 static const char *const pcm3168a_roll_off[] = { "Sharp", "Slow" };
@@ -314,6 +315,37 @@ static int pcm3168a_set_dai_sysclk(struct snd_soc_dai *dai,
 	return 0;
 }
 
+static void pcm3168a_update_fixup_pcm_stream(struct snd_soc_dai *dai)
+{
+	struct snd_soc_component *component = dai->component;
+	struct pcm3168a_priv *pcm3168a = snd_soc_component_get_drvdata(component);
+	u64 formats = SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_LE;
+	unsigned int channel_max = dai->id == PCM3168A_DAI_DAC ? 8 : 6;
+
+	if (!pcm3168a->io_params[dai->id].fmt)
+		return;
+
+	if (pcm3168a->io_params[dai->id].fmt == PCM3168A_FMT_RIGHT_J) {
+		/* S16_LE is only supported in RIGHT_J mode */
+		formats |= SNDRV_PCM_FMTBIT_S16_LE;
+
+		/*
+		 * If multi DIN/DOUT is not selected, RIGHT_J can only support
+		 * two channels (no TDM support)
+		 */
+		if (pcm3168a->io_params[dai->id].tdm_slots != 2)
+			channel_max = 2;
+	}
+
+	if (dai->id == PCM3168A_DAI_DAC) {
+		dai->driver->playback.channels_max = channel_max;
+		dai->driver->playback.formats = formats;
+	} else {
+		dai->driver->capture.channels_max = channel_max;
+		dai->driver->capture.formats = formats;
+	}
+}
+
 static int pcm3168a_set_dai_fmt(struct snd_soc_dai *dai, unsigned int format)
 {
 	struct snd_soc_component *component = dai->component;
@@ -376,6 +408,8 @@ static int pcm3168a_set_dai_fmt(struct snd_soc_dai *dai, unsigned int format)
 
 	regmap_update_bits(pcm3168a->regmap, reg, mask, fmt << shift);
 
+	pcm3168a_update_fixup_pcm_stream(dai);
+
 	return 0;
 }
 
@@ -409,6 +443,8 @@ static int pcm3168a_set_tdm_slot(struct snd_soc_dai *dai, unsigned int tx_mask,
 	else
 		io_params->tdm_mask = rx_mask;
 
+	pcm3168a_update_fixup_pcm_stream(dai);
+
 	return 0;
 }
 
@@ -530,63 +566,7 @@ static int pcm3168a_hw_params(struct snd_pcm_substream *substream,
 	return 0;
 }
 
-static int pcm3168a_startup(struct snd_pcm_substream *substream,
-			    struct snd_soc_dai *dai)
-{
-	struct snd_soc_component *component = dai->component;
-	struct pcm3168a_priv *pcm3168a = snd_soc_component_get_drvdata(component);
-	unsigned int sample_min;
-	unsigned int channel_max;
-	unsigned int channel_maxs[] = {
-		8, /* DAC */
-		6  /* ADC */
-	};
-
-	/*
-	 * Available Data Bits
-	 *
-	 * RIGHT_J : 24 / 16
-	 * LEFT_J  : 24
-	 * I2S     : 24
-	 *
-	 * TDM available
-	 *
-	 * I2S
-	 * LEFT_J
-	 */
-	switch (pcm3168a->io_params[dai->id].fmt) {
-	case PCM3168A_FMT_RIGHT_J:
-		sample_min  = 16;
-		channel_max =  2;
-		break;
-	case PCM3168A_FMT_LEFT_J:
-	case PCM3168A_FMT_I2S:
-	case PCM3168A_FMT_DSP_A:
-	case PCM3168A_FMT_DSP_B:
-		sample_min  = 24;
-		channel_max = channel_maxs[dai->id];
-		break;
-	default:
-		sample_min  = 24;
-		channel_max =  2;
-	}
-
-	snd_pcm_hw_constraint_minmax(substream->runtime,
-				     SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
-				     sample_min, 32);
-
-	/* Allow all channels in multi DIN/DOUT mode */
-	if (pcm3168a->io_params[dai->id].tdm_slots == 2)
-		channel_max = channel_maxs[dai->id];
-
-	snd_pcm_hw_constraint_minmax(substream->runtime,
-				     SNDRV_PCM_HW_PARAM_CHANNELS,
-				     2, channel_max);
-
-	return 0;
-}
 static const struct snd_soc_dai_ops pcm3168a_dai_ops = {
-	.startup	= pcm3168a_startup,
 	.set_fmt	= pcm3168a_set_dai_fmt,
 	.set_sysclk	= pcm3168a_set_dai_sysclk,
 	.hw_params	= pcm3168a_hw_params,
@@ -776,8 +756,10 @@ int pcm3168a_probe(struct device *dev, struct regmap *regmap)
 	pm_runtime_enable(dev);
 	pm_runtime_idle(dev);
 
-	ret = devm_snd_soc_register_component(dev, &pcm3168a_driver, pcm3168a_dais,
-			ARRAY_SIZE(pcm3168a_dais));
+	memcpy(pcm3168a->dai_drv, pcm3168a_dais, sizeof(pcm3168a->dai_drv));
+	ret = devm_snd_soc_register_component(dev, &pcm3168a_driver,
+					      pcm3168a->dai_drv,
+					      ARRAY_SIZE(pcm3168a->dai_drv));
 	if (ret) {
 		dev_err(dev, "failed to register component: %d\n", ret);
 		goto err_regulator;