diff options
-rw-r--r-- | sound/firewire/fireface/ff-pcm.c | 29 |
1 files changed, 23 insertions, 6 deletions
diff --git a/sound/firewire/fireface/ff-pcm.c b/sound/firewire/fireface/ff-pcm.c index 4f2208202494..415bc9ccd1c7 100644 --- a/sound/firewire/fireface/ff-pcm.c +++ b/sound/firewire/fireface/ff-pcm.c @@ -139,6 +139,7 @@ static int pcm_init_hw_params(struct snd_ff *ff, static int pcm_open(struct snd_pcm_substream *substream) { struct snd_ff *ff = substream->private_data; + struct amdtp_domain *d = &ff->domain; unsigned int rate; enum snd_ff_clock_src src; int i, err; @@ -155,16 +156,21 @@ static int pcm_open(struct snd_pcm_substream *substream) if (err < 0) goto release_lock; + mutex_lock(&ff->mutex); + + // 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_FF_CLOCK_SRC_INTERNAL) { for (i = 0; i < CIP_SFC_COUNT; ++i) { if (amdtp_rate_table[i] == rate) break; } - /* - * The unit is configured at sampling frequency which packet - * streaming engine can't support. - */ + + // The unit is configured at sampling frequency which packet + // streaming engine can't support. if (i >= CIP_SFC_COUNT) { + mutex_unlock(&ff->mutex); err = -EIO; goto release_lock; } @@ -172,14 +178,25 @@ static int pcm_open(struct snd_pcm_substream *substream) substream->runtime->hw.rate_min = rate; substream->runtime->hw.rate_max = rate; } else { - if (amdtp_stream_pcm_running(&ff->rx_stream) || - amdtp_stream_pcm_running(&ff->tx_stream)) { + if (ff->substreams_counter > 0) { + unsigned int frames_per_period = d->events_per_period; + rate = amdtp_rate_table[ff->rx_stream.sfc]; substream->runtime->hw.rate_min = rate; substream->runtime->hw.rate_max = rate; + + 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(&ff->mutex); + goto release_lock; + } } } + mutex_unlock(&ff->mutex); + snd_pcm_set_sync(substream); return 0; |