ASoC: pcm3168a: add HW constraint for non RIGHT_J

RIGHT_J only can handle 16bit data bits.
Current driver just errored if user requests non RIGHT_J
+ 16bit combination. But it is not useful for user.
This patch adds HW constraint for it, and avoid
error on such situation.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/codecs/pcm3168a.c b/sound/soc/codecs/pcm3168a.c
index 3356c91..233a8df 100644 (file)
--- a/sound/soc/codecs/pcm3168a.c
+++ b/sound/soc/codecs/pcm3168a.c
@@ -476,7 +476,43 @@ 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);
+       bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
+       unsigned int fmt;
+       unsigned int sample_min;
+
+       if (tx)
+               fmt = pcm3168a->dac_fmt;
+       else
+               fmt = pcm3168a->adc_fmt;
+
+       /*
+        * Available Data Bits
+        *
+        * RIGHT_J : 24 / 16
+        * LEFT_J  : 24
+        * I2S     : 24
+        */
+       switch (fmt) {
+       case PCM3168A_FMT_RIGHT_J:
+               sample_min  = 16;
+               break;
+       default:
+               sample_min  = 24;
+       }
+
+       snd_pcm_hw_constraint_minmax(substream->runtime,
+                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
+                                    sample_min, 32);
+
+       return 0;
+}
 static const struct snd_soc_dai_ops pcm3168a_dac_dai_ops = {
+       .startup        = pcm3168a_startup,
        .set_fmt        = pcm3168a_set_dai_fmt_dac,
        .set_sysclk     = pcm3168a_set_dai_sysclk,
        .hw_params      = pcm3168a_hw_params,