diff options
| author | Lars-Peter Clausen <lars@metafoo.de> | 2013-04-20 13:29:00 -0400 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2013-04-22 06:27:04 -0400 |
| commit | d1e1406c6ed0b92200a7de2a09fbab65661dba3c (patch) | |
| tree | b29e9b0f9c068b97e3318a5dbafa0c75cf710399 /include | |
| parent | 22f38f792ec53e2a93be13ecb609bbe911ed8ff9 (diff) | |
ASoC: generic-dmaengine-pcm: Add support for half-duplex
Some platforms which are half-duplex share the same DMA channel between the
playback and capture stream. Add support for this to the generic dmaengine PCM
driver.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/sound/dmaengine_pcm.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/sound/dmaengine_pcm.h b/include/sound/dmaengine_pcm.h index b1d1150c1d60..f11c35cd5532 100644 --- a/include/sound/dmaengine_pcm.h +++ b/include/sound/dmaengine_pcm.h | |||
| @@ -91,6 +91,11 @@ void snd_dmaengine_pcm_set_config_from_dai_data( | |||
| 91 | * bytes that are still left to transfer. | 91 | * bytes that are still left to transfer. |
| 92 | */ | 92 | */ |
| 93 | #define SND_DMAENGINE_PCM_FLAG_NO_RESIDUE BIT(2) | 93 | #define SND_DMAENGINE_PCM_FLAG_NO_RESIDUE BIT(2) |
| 94 | /* | ||
| 95 | * The PCM is half duplex and the DMA channel is shared between capture and | ||
| 96 | * playback. | ||
| 97 | */ | ||
| 98 | #define SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX BIT(3) | ||
| 94 | 99 | ||
| 95 | /** | 100 | /** |
| 96 | * struct snd_dmaengine_pcm_config - Configuration data for dmaengine based PCM | 101 | * struct snd_dmaengine_pcm_config - Configuration data for dmaengine based PCM |