BDW boards using this machine driver supports only stereo capture and
playback. Implement a constraint to enforce it.
Signed-off-by: Brent Lu <brent.lu@xxxxxxxxx>
---
sound/soc/intel/boards/bdw-rt5677.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/sound/soc/intel/boards/bdw-rt5677.c b/sound/soc/intel/boards/bdw-rt5677.c
index cc41a34..5f96d7a 100644
--- a/sound/soc/intel/boards/bdw-rt5677.c
+++ b/sound/soc/intel/boards/bdw-rt5677.c
@@ -222,6 +222,31 @@ static int bdw_rt5677_rtd_init(struct snd_soc_pcm_runtime *rtd)
}
#endif
+static const unsigned int channels[] = {
+ 2,
+};
+
+static const struct snd_pcm_hw_constraint_list constraints_channels = {
+ .count = ARRAY_SIZE(channels),
+ .list = channels,
+ .mask = 0,
+};
+
+static int bdw_rt5677_fe_startup(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+
+ /* Board supports stereo configuration only */
+ runtime->hw.channels_max = 2;
+ return snd_pcm_hw_constraint_list(runtime, 0,
+ SNDRV_PCM_HW_PARAM_CHANNELS,
+ &constraints_channels);
+}
+
+static const struct snd_soc_ops bdw_rt5677_fe_ops = {
+ .startup = bdw_rt5677_fe_startup,
+};
+
static int bdw_rt5677_init(struct snd_soc_pcm_runtime *rtd)
{
struct bdw_rt5677_priv *bdw_rt5677 =
@@ -321,6 +346,7 @@ static struct snd_soc_dai_link bdw_rt5677_dais[] = {
},
.dpcm_capture = 1,
.dpcm_playback = 1,
+ .ops = &bdw_rt5677_fe_ops,
SND_SOC_DAILINK_REG(fe, dummy, platform),
},
--
2.7.4
