BDW boards using this machine driver supports only 2 or 4-channel capture.
Implement a constraint to enforce it.
Signed-off-by: Brent Lu <brent.lu@xxxxxxxxx>
---
sound/soc/intel/boards/bdw-rt5650.c | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/sound/soc/intel/boards/bdw-rt5650.c b/sound/soc/intel/boards/bdw-rt5650.c
index af2f502..a97e912 100644
--- a/sound/soc/intel/boards/bdw-rt5650.c
+++ b/sound/soc/intel/boards/bdw-rt5650.c
@@ -162,6 +162,34 @@ static int bdw_rt5650_rtd_init(struct snd_soc_pcm_runtime *rtd)
}
#endif
+static const unsigned int channels[] = {
+ 2, 4,
+};
+
+static const struct snd_pcm_hw_constraint_list constraints_channels = {
+ .count = ARRAY_SIZE(channels),
+ .list = channels,
+ .mask = 0,
+};
+
+static int bdw_rt5650_fe_startup(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+
+ /* Board supports stereo and quad configurations for capture */
+ if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
+ return 0;
+
+ runtime->hw.channels_max = 4;
+ return snd_pcm_hw_constraint_list(runtime, 0,
+ SNDRV_PCM_HW_PARAM_CHANNELS,
+ &constraints_channels);
+}
+
+static const struct snd_soc_ops bdw_rt5650_fe_ops = {
+ .startup = bdw_rt5650_fe_startup,
+};
+
static int bdw_rt5650_init(struct snd_soc_pcm_runtime *rtd)
{
struct bdw_rt5650_priv *bdw_rt5650 =
@@ -234,6 +262,7 @@ static struct snd_soc_dai_link bdw_rt5650_dais[] = {
.name = "System PCM",
.stream_name = "System Playback",
.dynamic = 1,
+ .ops = &bdw_rt5650_fe_ops,
#if !IS_ENABLED(CONFIG_SND_SOC_SOF_BROADWELL)
.init = bdw_rt5650_rtd_init,
#endif
--
2.7.4
