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Date: Mon, 24 Sep 2012 10:58:04 +0300 From: Peter Ujfalusi <peter.ujfalusi@...com> To: Stephen Rothwell <sfr@...b.auug.org.au>, Mark Brown <broonie@...nsource.wolfsonmicro.com>, Liam Girdwood <lrg@...com>, Takashi Iwai <tiwai@...e.de> Cc: alsa-devel@...a-project.org, linux-next@...r.kernel.org, linux-kernel@...r.kernel.org, Vinod Koul <vinod.koul@...el.com>, Kukjin Kim <kgene.kim@...sung.com>, Lars-Peter Clausen <lars@...afoo.de> Subject: [PATCH 1/2] dmaengine: Add flags parameter to dmaengine_prep_dma_cyclic() With this parameter added to dmaengine_prep_dma_cyclic() the API will be in sync with other dmaengine_prep_*() functions. The dmaengine_prep_dma_cyclic() function primarily used by audio for cyclic transfer required by ALSA, we use the from audio to ask dma drivers to suppress interrupts (if DMA_PREP_INTERRUPT is cleared) when it is supported on the platform. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com> CC: Lars-Peter Clausen <lars@...afoo.de> --- include/linux/dmaengine.h | 3 ++- sound/soc/soc-dmaengine-pcm.c | 6 +++++- 2 files changed, 7 insertions(+), 2 deletions(-) diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 09da4e5..d3201e4 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, + unsigned long flags) { return chan->device->device_prep_dma_cyclic(chan, buf_addr, buf_len, period_len, dir, flags, NULL); diff --git a/sound/soc/soc-dmaengine-pcm.c b/sound/soc/soc-dmaengine-pcm.c index 5df529e..bbc1257 100644 --- a/sound/soc/soc-dmaengine-pcm.c +++ b/sound/soc/soc-dmaengine-pcm.c @@ -140,14 +140,18 @@ static int dmaengine_pcm_prepare_and_submit(struct snd_pcm_substream *substream) struct dma_chan *chan = prtd->dma_chan; struct dma_async_tx_descriptor *desc; enum dma_transfer_direction direction; + unsigned long flags = DMA_CTRL_ACK; direction = snd_pcm_substream_to_dma_direction(substream); + if (!substream->runtime->no_period_wakeup) + flags |= DMA_PREP_INTERRUPT; + prtd->pos = 0; 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, flags); if (!desc) return -ENOMEM; -- 1.7.12 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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