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ASoC: generic-dmaengine-pcm: Add support for half-duplex

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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>
This commit is contained in:
Lars-Peter Clausen 2013-04-20 19:29:00 +02:00 • committed by Mark Brown
parent 22f38f792e
commit d1e1406c6e
2 changed files with 35 additions and 13 deletions
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5
include/sound/dmaengine_pcm.h
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@ -91,6 +91,11 @@ void snd_dmaengine_pcm_set_config_from_dai_data(
* bytes that are still left to transfer.
*/
#define SND_DMAENGINE_PCM_FLAG_NO_RESIDUE BIT(2)
/*
* The PCM is half duplex and the DMA channel is shared between capture and
* playback.
*/
#define SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX BIT(3)
/**
* struct snd_dmaengine_pcm_config - Configuration data for dmaengine based PCM