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@ti.com CC: Lars-Peter Clausen lars@metafoo.de --- 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, substream->runtime->dma_addr, snd_pcm_lib_buffer_bytes(substream), - snd_pcm_lib_period_bytes(substream), direction); + snd_pcm_lib_period_bytes(substream), direction, + substream->runtime->no_period_wakeup);
if (!desc) return -ENOMEM;