Commit 95a771ca authored by Lars-Peter Clausen's avatar Lars-Peter Clausen Committed by Mark Brown
Browse files

ASoC: mxs-pcm: Request DMA channel early 



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: default avatarLars-Peter Clausen <lars@metafoo.de>
Tested-by: default avatarShawn Guo <shawn.guo@linaro.org>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 4564d10f

sound/soc/mxs/mxs-pcm.c

+8 −20
Original line number Diff line number Diff line
@@ -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,

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