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@intel.com --- sound/soc/intel/boards/broadwell.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+)
diff --git a/sound/soc/intel/boards/broadwell.c b/sound/soc/intel/boards/broadwell.c index f9a8336..07b2cfd 100644 --- a/sound/soc/intel/boards/broadwell.c +++ b/sound/soc/intel/boards/broadwell.c @@ -143,6 +143,31 @@ static int broadwell_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 broadwell_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 broadwell_fe_ops = { + .startup = broadwell_fe_startup, +}; + SND_SOC_DAILINK_DEF(system, DAILINK_COMP_ARRAY(COMP_CPU("System Pin")));
@@ -180,6 +205,7 @@ static struct snd_soc_dai_link broadwell_rt286_dais[] = { .init = broadwell_rtd_init, #endif .trigger = {SND_SOC_DPCM_TRIGGER_POST, SND_SOC_DPCM_TRIGGER_POST}, + .ops = &broadwell_fe_ops, .dpcm_playback = 1, .dpcm_capture = 1, SND_SOC_DAILINK_REG(system, dummy, platform),