From 76c4ecbe4b07c0d1b1aba31bf2a7f20cccbdbb4e Mon Sep 17 00:00:00 2001 From: Takashi Sakamoto Date: Fri, 18 Oct 2019 00:54:18 +0900 Subject: ALSA: firewire-digi00x: share PCM buffer size for both direction This commit allows ALSA firewire-digi00x 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/20191017155424.885-7-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai --- sound/firewire/digi00x/digi00x-pcm.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) (limited to 'sound/firewire/digi00x/digi00x-pcm.c') diff --git a/sound/firewire/digi00x/digi00x-pcm.c b/sound/firewire/digi00x/digi00x-pcm.c index 8dbfb3ff17f6..c9a833dff20d 100644 --- a/sound/firewire/digi00x/digi00x-pcm.c +++ b/sound/firewire/digi00x/digi00x-pcm.c @@ -135,6 +135,7 @@ static int pcm_open(struct snd_pcm_substream *substream) if ((clock != SND_DG00X_CLOCK_INTERNAL) || (dg00x->substreams_counter > 0 && d->events_per_period > 0)) { unsigned int frames_per_period = d->events_per_period; + unsigned int frames_per_buffer = d->events_per_buffer; unsigned int rate; err = snd_dg00x_stream_get_external_rate(dg00x, &rate); @@ -153,6 +154,14 @@ static int pcm_open(struct snd_pcm_substream *substream) mutex_unlock(&dg00x->mutex); goto err_locked; } + + 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(&dg00x->mutex); + goto err_locked; + } } } @@ -189,10 +198,11 @@ 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(&dg00x->mutex); err = snd_dg00x_stream_reserve_duplex(dg00x, rate, - frames_per_period); + frames_per_period, frames_per_buffer); if (err >= 0) ++dg00x->substreams_counter; mutex_unlock(&dg00x->mutex); -- cgit v1.2.3