In current implementation, when opening a PCM substream, it's needed to check whether the opposite PCM substream runs. This is to assign effectual constraints (e.g. sampling rate) to opened PCM substream.
The number of PCM substreams and MIDI substreams on AMDTP streams in domain is recorded in own structure. Usage of this count is an alternative of the above check. This is better because the count is incremented in pcm.hw_params earlier than pcm.trigger.
This idea has one issue because it's incremented for MIDI substreams as well. In current implementation, for a case that any MIDI substream run and a PCM substream is going to start, PCM application to start the PCM substream can decide hardware parameters by restart packet streaming. Just checking the substream count can brings regression.
Now AMDTP domain structure has a member for the size of PCM period in PCM substream which starts AMDTP streams in domain. When the value has zero and the substream count is greater than 1, it means that any MIDI substream starts AMDTP streams in domain. Usage of the value can resolve the above issue.
This commit replaces the check with the substream count and the value for the size of PCM period.
Signed-off-by: Takashi Sakamoto o-takashi@sakamocchi.jp --- sound/firewire/motu/motu-pcm.c | 29 +++++++++++++++++++++-------- 1 file changed, 21 insertions(+), 8 deletions(-)
diff --git a/sound/firewire/motu/motu-pcm.c b/sound/firewire/motu/motu-pcm.c index 9a54c562494b..7bbf8b86a33d 100644 --- a/sound/firewire/motu/motu-pcm.c +++ b/sound/firewire/motu/motu-pcm.c @@ -134,8 +134,8 @@ static int pcm_open(struct snd_pcm_substream *substream) { struct snd_motu *motu = substream->private_data; const struct snd_motu_protocol *const protocol = motu->spec->protocol; + struct amdtp_domain *d = &motu->domain; enum snd_motu_clock_source src; - unsigned int rate; int err;
err = snd_motu_stream_lock_try(motu); @@ -152,28 +152,41 @@ static int pcm_open(struct snd_pcm_substream *substream) if (err < 0) goto err_locked;
- /* - * When source of clock is not internal or any PCM streams are running, - * available sampling rate is limited at current sampling rate. - */ err = protocol->get_clock_source(motu, &src); if (err < 0) goto err_locked; + + // When source of clock is not internal or any stream is reserved for + // transmission of PCM frames, the available sampling rate is limited + // at current one. if (src != SND_MOTU_CLOCK_SOURCE_INTERNAL || - amdtp_stream_pcm_running(&motu->tx_stream) || - amdtp_stream_pcm_running(&motu->rx_stream)) { + (motu->substreams_counter > 0 && d->events_per_period > 0)) { + unsigned int frames_per_period = d->events_per_period; + unsigned int rate; + err = protocol->get_clock_rate(motu, &rate); if (err < 0) goto err_locked; + substream->runtime->hw.rate_min = rate; substream->runtime->hw.rate_max = rate; + + if (frames_per_period > 0) { + err = snd_pcm_hw_constraint_minmax(substream->runtime, + SNDRV_PCM_HW_PARAM_PERIOD_SIZE, + frames_per_period, frames_per_period); + if (err < 0) { + mutex_unlock(&motu->mutex); + goto err_locked; + } + } }
snd_pcm_set_sync(substream);
mutex_unlock(&motu->mutex);
- return err; + return 0; err_locked: mutex_unlock(&motu->mutex); snd_motu_stream_lock_release(motu);