diff options
| author | Sudheer Papothi <spapothi@codeaurora.org> | 2016-01-29 02:27:17 +0530 |
|---|---|---|
| committer | David Keitel <dkeitel@codeaurora.org> | 2016-03-23 20:10:15 -0700 |
| commit | b45b11503a44b48e1bee649ecaf1867a4d800fa7 (patch) | |
| tree | 25c99e7016755e9b119bee86b2400676260f2221 /include | |
| parent | eb4032ed5cf2078b09de8be71f14f75afe56356d (diff) | |
ALSA: pcm - add support for hostless audio
Allow some PCM devices to be hostless, i.e. there is no PCM data transferred
to or from the host CPU. This can be used to minimise power on systems since
the CPU can idle/sleep during the PCM device operation (e.g. a phone call
where the DAI is between a MODEM and DSP)
TODO: cleanup, look at adding a read/write blocker.
Singed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Banajit Goswami <bgoswami@codeaurora.org>
Signed-off-by: Sudheer Papothi <spapothi@codeaurora.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/sound/pcm.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/sound/pcm.h b/include/sound/pcm.h index e1dafdcb3c82..b293f60108ac 100644 --- a/include/sound/pcm.h +++ b/include/sound/pcm.h @@ -490,6 +490,7 @@ struct snd_pcm_substream { #endif /* CONFIG_SND_VERBOSE_PROCFS */ /* misc flags */ unsigned int hw_opened: 1; + unsigned int hw_no_buffer: 1; /* substream may not have a buffer */ }; #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0) |