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ASoC: dmaengine: support deferred probe for DMA channels 

Enhance dmaengine_pcm_request_chan_of() to support deferred probe for
DMA channels, by using the new dma_request_slave_channel_or_err() API.
This prevents snd_dmaengine_pcm_register() from succeeding without
acquiring DMA channels due to the relevant DMA controller not yet being
registered.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Stephen Warren 2013-12-10 11:11:02 -07:00 committed by Mark Brown
parent d3ae883530
commit 5eda87b890
1 changed files with 16 additions and 4 deletions
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20
sound/soc/soc-generic-dmaengine-pcm.c
View File

@ -287,16 +287,17 @@ static const char * const dmaengine_pcm_dma_channel_names[] = {
[SNDRV_PCM_STREAM_CAPTURE] = "rx",
};
static void dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm,
static int dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm,
struct device *dev, const struct snd_dmaengine_pcm_config *config)
{
unsigned int i;
const char *name;
struct dma_chan *chan;
if ((pcm->flags & (SND_DMAENGINE_PCM_FLAG_NO_DT |
SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME)) ||
!dev->of_node)
return;
return 0;
if (config->dma_dev) {
/*
@ -318,13 +319,22 @@ static void dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm,
name = dmaengine_pcm_dma_channel_names[i];
if (config->chan_names[i])
name = config->chan_names[i];
pcm->chan[i] = dma_request_slave_channel(dev, name);
chan = dma_request_slave_channel_reason(dev, name);
if (IS_ERR(chan)) {
if (PTR_ERR(pcm->chan[i]) == -EPROBE_DEFER)
return -EPROBE_DEFER;
pcm->chan[i] = NULL;
} else {
pcm->chan[i] = chan;
}
if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
break;
}
if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
pcm->chan[1] = pcm->chan[0];
return 0;
}
static void dmaengine_pcm_release_chan(struct dmaengine_pcm *pcm)
@ -360,7 +370,9 @@ int snd_dmaengine_pcm_register(struct device *dev,
pcm->config = config;
pcm->flags = flags;
dmaengine_pcm_request_chan_of(pcm, dev, config);
ret = dmaengine_pcm_request_chan_of(pcm, dev, config);
if (ret)
goto err_free_dma;
if (flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
ret = snd_soc_add_platform(dev, &pcm->platform,