static int tegra_pcm_open(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct device *dev = rtd->platform->dev;
struct tegra_runtime_data *prtd;
int ret;
if (rtd->dai_link->no_pcm)
return 0;
prtd = kzalloc(sizeof(struct tegra_runtime_data), GFP_KERNEL);
if (prtd == NULL)
return -ENOMEM;
/* Set HW params now that initialization is complete */
snd_soc_set_runtime_hwparams(substream, &tegra_pcm_hardware);
/* Ensure period size is multiple of 8 */
ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 0x8);
if (ret) {
dev_err(dev, "failed to set constraint %d\n", ret);
kfree(prtd);
return ret;
}
ret = snd_dmaengine_pcm_open_request_chan(substream, NULL, NULL);
if (ret) {
dev_err(dev, "dmaengine pcm open failed with err %d\n", ret);
kfree(prtd);
return ret;
}
snd_dmaengine_pcm_set_data(substream, prtd);
return 0;
}
static int omap_pcm_open(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_dmaengine_dai_dma_data *dma_data;
int ret;
snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
/* DT boot: filter_data is the DMA name */
if (rtd->cpu_dai->dev->of_node) {
struct dma_chan *chan;
chan = dma_request_slave_channel(rtd->cpu_dai->dev,
dma_data->filter_data);
ret = snd_dmaengine_pcm_open(substream, chan);
} else {
ret = snd_dmaengine_pcm_open_request_chan(substream,
omap_dma_filter_fn,
dma_data->filter_data);
}
return ret;
}
