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| author | Lars-Peter Clausen <lars@metafoo.de> | 2013-04-15 19:19:48 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2013-04-17 14:17:54 +0100 |
| commit | 7c1c1d4a7b4ca1266057a3632d27450f5575caf9 (patch) | |
| tree | 39e53ebd108b551ba939fd13ca9e3c2f8f869400 /sound/soc/tegra/tegra_pcm.c | |
| parent | 69b6f19622ce0aef41df884b75e3f789c64b89c0 (diff) | |
| download | blackbird-op-linux-7c1c1d4a7b4ca1266057a3632d27450f5575caf9.tar.gz blackbird-op-linux-7c1c1d4a7b4ca1266057a3632d27450f5575caf9.zip | |
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/tegra/tegra_pcm.c')
| -rw-r--r-- | sound/soc/tegra/tegra_pcm.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sound/soc/tegra/tegra_pcm.c b/sound/soc/tegra/tegra_pcm.c index f91d08bc1753..32d08119dd87 100644 --- a/sound/soc/tegra/tegra_pcm.c +++ b/sound/soc/tegra/tegra_pcm.c @@ -66,7 +66,7 @@ static int tegra_pcm_open(struct snd_pcm_substream *substream) /* Set HW params now that initialization is complete */ snd_soc_set_runtime_hwparams(substream, &tegra_pcm_hardware); - ret = snd_dmaengine_pcm_open(substream, NULL, NULL); + ret = snd_dmaengine_pcm_open_request_chan(substream, NULL, NULL); if (ret) { dev_err(dev, "dmaengine pcm open failed with err %d\n", ret); return ret; @@ -144,7 +144,7 @@ static int tegra_pcm_mmap(struct snd_pcm_substream *substream, static struct snd_pcm_ops tegra_pcm_ops = { .open = tegra_pcm_open, - .close = snd_dmaengine_pcm_close, + .close = snd_dmaengine_pcm_close_release_chan, .ioctl = snd_pcm_lib_ioctl, .hw_params = tegra_pcm_hw_params, .hw_free = tegra_pcm_hw_free, |
