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author | Peter Ujfalusi <peter.ujfalusi@ti.com> | 2014-11-10 10:32:16 (GMT) |
---|---|---|
committer | Mark Brown <broonie@kernel.org> | 2014-11-10 15:00:01 (GMT) |
commit | 11277833ce8018ddd18925d2f85037bf02dcba63 (patch) | |
tree | f8bf476c1d629c69256b2cfd17f74f20c7dc9df6 /sound/soc/davinci | |
parent | 1a5923da4e2e6997f03545a2b88f2cd2dea1a5c2 (diff) | |
download | linux-11277833ce8018ddd18925d2f85037bf02dcba63.tar.xz |
ASoC: davinci-mcasp: Place constraint on number of channels
In IIS (I2S, TDM, etc) mode the maximum number of allowed channels for
either direction can be:
number of serializers for the direction * tdm_slots.
This constraint applicable for the first stream, while consequent stream
should not have more channels then the first stream.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc/davinci')
-rw-r--r-- | sound/soc/davinci/davinci-mcasp.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c index 10c2647..10ae75e 100644 --- a/sound/soc/davinci/davinci-mcasp.c +++ b/sound/soc/davinci/davinci-mcasp.c @@ -90,6 +90,9 @@ struct davinci_mcasp { bool dat_port; + /* Used for comstraint setting on the second stream */ + u32 channels; + #ifdef CONFIG_PM_SLEEP struct davinci_mcasp_context context; #endif @@ -811,6 +814,9 @@ static int davinci_mcasp_hw_params(struct snd_pcm_substream *substream, davinci_config_channel_size(mcasp, word_length); + if (mcasp->op_mode == DAVINCI_MCASP_IIS_MODE) + mcasp->channels = channels; + return 0; } @@ -839,7 +845,61 @@ static int davinci_mcasp_trigger(struct snd_pcm_substream *substream, return ret; } +static int davinci_mcasp_startup(struct snd_pcm_substream *substream, + struct snd_soc_dai *cpu_dai) +{ + struct davinci_mcasp *mcasp = snd_soc_dai_get_drvdata(cpu_dai); + u32 max_channels = 0; + int i, dir; + + if (mcasp->op_mode == DAVINCI_MCASP_DIT_MODE) + return 0; + + /* + * Limit the maximum allowed channels for the first stream: + * number of serializers for the direction * tdm slots per serializer + */ + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) + dir = TX_MODE; + else + dir = RX_MODE; + + for (i = 0; i < mcasp->num_serializer; i++) { + if (mcasp->serial_dir[i] == dir) + max_channels++; + } + max_channels *= mcasp->tdm_slots; + /* + * If the already active stream has less channels than the calculated + * limnit based on the seirializers * tdm_slots, we need to use that as + * a constraint for the second stream. + * Otherwise (first stream or less allowed channels) we use the + * calculated constraint. + */ + if (mcasp->channels && mcasp->channels < max_channels) + max_channels = mcasp->channels; + + snd_pcm_hw_constraint_minmax(substream->runtime, + SNDRV_PCM_HW_PARAM_CHANNELS, + 2, max_channels); + return 0; +} + +static void davinci_mcasp_shutdown(struct snd_pcm_substream *substream, + struct snd_soc_dai *cpu_dai) +{ + struct davinci_mcasp *mcasp = snd_soc_dai_get_drvdata(cpu_dai); + + if (mcasp->op_mode == DAVINCI_MCASP_DIT_MODE) + return; + + if (!cpu_dai->active) + mcasp->channels = 0; +} + static const struct snd_soc_dai_ops davinci_mcasp_dai_ops = { + .startup = davinci_mcasp_startup, + .shutdown = davinci_mcasp_shutdown, .trigger = davinci_mcasp_trigger, .hw_params = davinci_mcasp_hw_params, .set_fmt = davinci_mcasp_set_dai_fmt, |