[PATCH v2 03/15] dmaengine: Add no_wakeup parameter to dmaengine_prep_dma_cyclic()

From: Peter Ujfalusi
Date: Thu Sep 13 2012 - 09:41:48 EST

The dmaengine_prep_dma_cyclic() function primarily used by audio for cyclic
transfer required by ALSA.
With this new parameter it is going to be possible to enable the
SNDRV_PCM_INFO_NO_PERIOD_WAKEUP mode on platforms where it is possible.
This patch only changes the public API first. Followup patch will change
the device_prep_dma_cyclic() callback parameters to pass this information
towards the dma drivers.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@xxxxxx>
CC: Lars-Peter Clausen <lars@xxxxxxxxxx>
include/linux/dmaengine.h | 3 ++-
sound/soc/soc-dmaengine-pcm.c | 3 ++-
2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 9c02a45..990444b 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -653,7 +653,8 @@ static inline struct dma_async_tx_descriptor *dmaengine_prep_rio_sg(

static inline struct dma_async_tx_descriptor *dmaengine_prep_dma_cyclic(
struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
- size_t period_len, enum dma_transfer_direction dir)
+ size_t period_len, enum dma_transfer_direction dir,
+ bool no_wakeup)
return chan->device->device_prep_dma_cyclic(chan, buf_addr, buf_len,
period_len, dir, NULL);
diff --git a/sound/soc/soc-dmaengine-pcm.c b/sound/soc/soc-dmaengine-pcm.c
index 5df529e..6b70adb 100644
--- a/sound/soc/soc-dmaengine-pcm.c
+++ b/sound/soc/soc-dmaengine-pcm.c
@@ -147,7 +147,8 @@ static int dmaengine_pcm_prepare_and_submit(struct snd_pcm_substream *substream)
desc = dmaengine_prep_dma_cyclic(chan,
- snd_pcm_lib_period_bytes(substream), direction);
+ snd_pcm_lib_period_bytes(substream), direction,
+ substream->runtime->no_period_wakeup);

if (!desc)
return -ENOMEM;

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