ASoC: Intel: bxt: Use refcap device for mono recording

The refcap capture device supports mono recording only, this patch adds the channel constraints. Signed-off-by: Yong Zhi <[email protected]> Reviewed-by: Pierre-Louis Bossart <[email protected]> Signed-off-by: Mark Brown <[email protected]>
akeromi · Aug 3, 2018 · 26a6dce · 26a6dce
1 parent 611cbc8
commit 26a6dce
Showing 1 changed file with 14 additions and 0 deletions.
diff --git a/sound/soc/intel/boards/bxt_da7219_max98357a.c b/sound/soc/intel/boards/bxt_da7219_max98357a.c
@@ -324,8 +324,22 @@ static const struct snd_pcm_hw_constraint_list constraints_16000 = {
 	.list  = rates_16000,
 };
 
+static const unsigned int ch_mono[] = {
+	1,
+};
+
+static const struct snd_pcm_hw_constraint_list constraints_refcap = {
+	.count = ARRAY_SIZE(ch_mono),
+	.list  = ch_mono,
+};
+
 static int broxton_refcap_startup(struct snd_pcm_substream *substream)
 {
+	substream->runtime->hw.channels_max = 1;
+	snd_pcm_hw_constraint_list(substream->runtime, 0,
+				   SNDRV_PCM_HW_PARAM_CHANNELS,
+				   &constraints_refcap);
+
 	return snd_pcm_hw_constraint_list(substream->runtime, 0,
 			SNDRV_PCM_HW_PARAM_RATE,
 			&constraints_16000);