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authorLars-Peter Clausen <lars@metafoo.de>2013-04-15 19:19:48 +0200
committerMark Brown <broonie@opensource.wolfsonmicro.com>2013-04-17 14:17:54 +0100
commit7c1c1d4a7b4ca1266057a3632d27450f5575caf9 (patch)
tree39e53ebd108b551ba939fd13ca9e3c2f8f869400 /sound/soc/mxs
parent69b6f19622ce0aef41df884b75e3f789c64b89c0 (diff)
downloadop-kernel-dev-7c1c1d4a7b4ca1266057a3632d27450f5575caf9.zip
op-kernel-dev-7c1c1d4a7b4ca1266057a3632d27450f5575caf9.tar.gz
ASoC: dmaengine-pcm: Make requesting the DMA channel at PCM open optional
Refactor the dmaengine PCM library to allow the DMA channel to be requested before opening a PCM substream. snd_dmaengine_pcm_open() now expects a DMA channel instead of a filter function and filter parameter as its parameters. snd_dmaengine_pcm_close() is updated to not release the DMA channel. This allows a dmaengine based PCM driver to request its channels before the substream is opened. The patch also introduces two new functions, snd_dmaengine_pcm_open_request_chan() and snd_dmaengine_pcm_close_release_chan(), which have the same signature and behaviour of the old snd_dmaengine_pcm_{open,close}() and internally use the new variants of these functions. All users of snd_dmaengine_pcm_{open,close}() are updated to use snd_dmaengine_pcm_open_request_chan() and snd_dmaengine_pcm_close_release_chan(). Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Tested-by: Stephen Warren <swarren@nvidia.com> Tested-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'sound/soc/mxs')
-rw-r--r--sound/soc/mxs/mxs-pcm.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/sound/soc/mxs/mxs-pcm.c b/sound/soc/mxs/mxs-pcm.c
index ebbef85..7bceb16 100644
--- a/sound/soc/mxs/mxs-pcm.c
+++ b/sound/soc/mxs/mxs-pcm.c
@@ -87,7 +87,7 @@ static int snd_mxs_open(struct snd_pcm_substream *substream)
snd_soc_set_runtime_hwparams(substream, &snd_mxs_hardware);
- return snd_dmaengine_pcm_open(substream, filter,
+ return snd_dmaengine_pcm_open_request_chan(substream, filter,
snd_soc_dai_get_dma_data(rtd->cpu_dai, substream));
}
@@ -104,7 +104,7 @@ static int snd_mxs_pcm_mmap(struct snd_pcm_substream *substream,
static struct snd_pcm_ops mxs_pcm_ops = {
.open = snd_mxs_open,
- .close = snd_dmaengine_pcm_close,
+ .close = snd_dmaengine_pcm_close_release_chan,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = snd_mxs_pcm_hw_params,
.trigger = snd_dmaengine_pcm_trigger,
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