Mono audio can be achieved by configuring McASP to transmit/receive only during one timeslot. McASP will still going to generate clocks for the other slot(s), but will only use the single slot to transmit/receive.
Signed-off-by: Peter Ujfalusi peter.ujfalusi@ti.com --- sound/soc/davinci/davinci-mcasp.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c index 5e02c7a15a83..31b4eac87aa2 100644 --- a/sound/soc/davinci/davinci-mcasp.c +++ b/sound/soc/davinci/davinci-mcasp.c @@ -650,7 +650,7 @@ static int davinci_mcasp_ch_constraint(struct davinci_mcasp *mcasp, int stream, if (mcasp->tdm_mask[stream]) slots = hweight32(mcasp->tdm_mask[stream]);
- for (i = 2; i <= slots; i++) + for (i = 1; i <= slots; i++) list[count++] = i;
for (i = 2; i <= serializers; i++) @@ -1318,7 +1318,7 @@ static int davinci_mcasp_startup(struct snd_pcm_substream *substream,
snd_pcm_hw_constraint_minmax(substream->runtime, SNDRV_PCM_HW_PARAM_CHANNELS, - 2, max_channels); + 0, max_channels);
snd_pcm_hw_constraint_list(substream->runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, @@ -1480,13 +1480,13 @@ static struct snd_soc_dai_driver davinci_mcasp_dai[] = { .suspend = davinci_mcasp_suspend, .resume = davinci_mcasp_resume, .playback = { - .channels_min = 2, + .channels_min = 1, .channels_max = 32 * 16, .rates = DAVINCI_MCASP_RATES, .formats = DAVINCI_MCASP_PCM_FMTS, }, .capture = { - .channels_min = 2, + .channels_min = 1, .channels_max = 32 * 16, .rates = DAVINCI_MCASP_RATES, .formats = DAVINCI_MCASP_PCM_FMTS, @@ -1992,12 +1992,12 @@ static int davinci_mcasp_probe(struct platform_device *pdev) */ mcasp->chconstr[SNDRV_PCM_STREAM_PLAYBACK].list = devm_kzalloc(mcasp->dev, sizeof(unsigned int) * - (32 + mcasp->num_serializer - 2), + (32 + mcasp->num_serializer - 1), GFP_KERNEL);
mcasp->chconstr[SNDRV_PCM_STREAM_CAPTURE].list = devm_kzalloc(mcasp->dev, sizeof(unsigned int) * - (32 + mcasp->num_serializer - 2), + (32 + mcasp->num_serializer - 1), GFP_KERNEL);
if (!mcasp->chconstr[SNDRV_PCM_STREAM_PLAYBACK].list ||