From 4de3eb062e2daf04646d23417a39b8843df4508b Mon Sep 17 00:00:00 2001 From: Takashi Sakamoto Date: Fri, 18 Oct 2019 00:54:21 +0900 Subject: ALSA: fireface: share PCM buffer size for both direction This commit allows ALSA fireface driver to share PCM buffer size for both capture and playback PCM substream. When AMDTP domain starts for one of the PCM substream, buffer size of the PCM substream is stores to AMDTP domain structure. Some AMDTP streams have already run with the buffer size when another PCM substream starts, therefore the PCM substream has a constraint to its buffer size. Signed-off-by: Takashi Sakamoto Link: https://lore.kernel.org/r/20191017155424.885-10-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai --- sound/firewire/fireface/ff-pcm.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) (limited to 'sound/firewire/fireface/ff-pcm.c') diff --git a/sound/firewire/fireface/ff-pcm.c b/sound/firewire/fireface/ff-pcm.c index 415bc9ccd1c7..005d959f8651 100644 --- a/sound/firewire/fireface/ff-pcm.c +++ b/sound/firewire/fireface/ff-pcm.c @@ -180,6 +180,7 @@ static int pcm_open(struct snd_pcm_substream *substream) } else { if (ff->substreams_counter > 0) { unsigned int frames_per_period = d->events_per_period; + unsigned int frames_per_buffer = d->events_per_buffer; rate = amdtp_rate_table[ff->rx_stream.sfc]; substream->runtime->hw.rate_min = rate; @@ -192,6 +193,14 @@ static int pcm_open(struct snd_pcm_substream *substream) mutex_unlock(&ff->mutex); goto release_lock; } + + err = snd_pcm_hw_constraint_minmax(substream->runtime, + SNDRV_PCM_HW_PARAM_BUFFER_SIZE, + frames_per_buffer, frames_per_buffer); + if (err < 0) { + mutex_unlock(&ff->mutex); + goto release_lock; + } } } @@ -229,9 +238,11 @@ static int pcm_hw_params(struct snd_pcm_substream *substream, if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) { unsigned int rate = params_rate(hw_params); unsigned int frames_per_period = params_period_size(hw_params); + unsigned int frames_per_buffer = params_buffer_size(hw_params); mutex_lock(&ff->mutex); - err = snd_ff_stream_reserve_duplex(ff, rate, frames_per_period); + err = snd_ff_stream_reserve_duplex(ff, rate, frames_per_period, + frames_per_buffer); if (err >= 0) ++ff->substreams_counter; mutex_unlock(&ff->mutex); -- cgit v1.2.3