diff options
| author | Takashi Sakamoto <o-takashi@sakamocchi.jp> | 2019-10-30 17:06:41 +0900 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2019-10-30 10:57:54 +0100 |
| commit | 3f58f004bff3273d102583e0b2f478526cf9d3c8 (patch) | |
| tree | 6d31f483cd0eac308eb491609a33384fd1317017 /sound/firewire/motu/motu-pcm.c | |
| parent | 1ef2ff941424bde4fd1d8dc97e0e600c5dc5472e (diff) | |
ALSA: firewire-motu: detect SPH source of sampling clock
In MOTU FireWire series, devices have a mode to generate sampling clock
from a sequence of source packet header (SPH) included in each data block
of received packet. This mode is used for several purposes such as mode
for SMPTE time code, sync to the other sound cards and so on.
This commit adds support for the SPH mode.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20191030080644.1704-4-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/firewire/motu/motu-pcm.c')
| -rw-r--r-- | sound/firewire/motu/motu-pcm.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/sound/firewire/motu/motu-pcm.c b/sound/firewire/motu/motu-pcm.c index 55d3d6661731..490408b49157 100644 --- a/sound/firewire/motu/motu-pcm.c +++ b/sound/firewire/motu/motu-pcm.c @@ -159,7 +159,8 @@ static int pcm_open(struct snd_pcm_substream *substream) // 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 || + if ((src != SND_MOTU_CLOCK_SOURCE_INTERNAL && + src != SND_MOTU_CLOCK_SOURCE_SPH) || (motu->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; |