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ASoC: mxs-pcm: Request DMA channel early

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Request the DMA channel in the PCM open callback instead of the hwparams
callback, this allows us to let open fail if no dma channel is available. This
also fixes a bug where the channel will be requested multiple times if hwparams
is called multiple times.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Lars-Peter Clausen 2012-02-22 10:49:07 +01:00 committed by Mark Brown
parent 4564d10f30
commit 95a771ca16
1 changed files with 8 additions and 20 deletions
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28
sound/soc/mxs/mxs-pcm.c
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@ -85,8 +85,7 @@ static bool filter(struct dma_chan *chan, void *param)
return true;
}
static int mxs_dma_alloc(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
static int mxs_dma_alloc(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_pcm_runtime *runtime = substream->runtime;
@ -112,11 +111,7 @@ static int snd_mxs_pcm_hw_params(struct snd_pcm_substream *substream,
struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
unsigned long dma_addr;
struct dma_chan *chan;
int ret;
ret = mxs_dma_alloc(substream, params);
if (ret)
return ret;
chan = iprtd->dma_chan;
iprtd->periods = params_periods(params);
@ -143,19 +138,6 @@ static int snd_mxs_pcm_hw_params(struct snd_pcm_substream *substream,
return 0;
}
static int snd_mxs_pcm_hw_free(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
if (iprtd->dma_chan) {
dma_release_channel(iprtd->dma_chan);
iprtd->dma_chan = NULL;
}
return 0;
}
static int snd_mxs_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_pcm_runtime *runtime = substream->runtime;
@ -208,6 +190,12 @@ static int snd_mxs_open(struct snd_pcm_substream *substream)
return ret;
}
ret = mxs_dma_alloc(substream);
if (ret) {
kfree(iprtd);
return ret;
}
snd_soc_set_runtime_hwparams(substream, &snd_mxs_hardware);
return 0;
@ -218,6 +206,7 @@ static int snd_mxs_close(struct snd_pcm_substream *substream)
struct snd_pcm_runtime *runtime = substream->runtime;
struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
dma_release_channel(iprtd->dma_chan);
kfree(iprtd);
return 0;
@ -239,7 +228,6 @@ static struct snd_pcm_ops mxs_pcm_ops = {
.close = snd_mxs_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = snd_mxs_pcm_hw_params,
.hw_free = snd_mxs_pcm_hw_free,
.trigger = snd_mxs_pcm_trigger,
.pointer = snd_mxs_pcm_pointer,
.mmap = snd_mxs_pcm_mmap,