static struct dma_chan *ux500_pcm_request_chan(struct snd_soc_pcm_runtime *rtd, struct snd_pcm_substream *substream) { struct snd_soc_dai *dai = rtd->cpu_dai; struct device *dev = dai->dev; u16 per_data_width, mem_data_width; struct stedma40_chan_cfg *dma_cfg; struct ux500_msp_dma_params *dma_params; dev_dbg(dev, "%s: MSP %d (%s): Enter.\n", __func__, dai->id, snd_pcm_stream_str(substream)); dma_params = snd_soc_dai_get_dma_data(dai, substream); dma_cfg = dma_params->dma_cfg; mem_data_width = STEDMA40_HALFWORD_WIDTH; switch (dma_params->data_size) { case 32: per_data_width = STEDMA40_WORD_WIDTH; break; case 16: per_data_width = STEDMA40_HALFWORD_WIDTH; break; case 8: per_data_width = STEDMA40_BYTE_WIDTH; break; default: per_data_width = STEDMA40_WORD_WIDTH; } if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { dma_cfg->src_info.data_width = mem_data_width; dma_cfg->dst_info.data_width = per_data_width; } else { dma_cfg->src_info.data_width = per_data_width; dma_cfg->dst_info.data_width = mem_data_width; } return snd_dmaengine_pcm_request_channel(stedma40_filter, dma_cfg); }
/** * snd_dmaengine_pcm_open_request_chan - Open a dmaengine based PCM substream and request channel * @substream: PCM substream * @filter_fn: Filter function used to request the DMA channel * @filter_data: Data passed to the DMA filter function * * Returns 0 on success, a negative error code otherwise. * * This function will request a DMA channel using the passed filter function and * data. The function should usually be called from the pcm open callback. Note * that this function will use private_data field of the substream's runtime. So * it is not availabe to your pcm driver implementation. */ int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream, dma_filter_fn filter_fn, void *filter_data) { return snd_dmaengine_pcm_open(substream, snd_dmaengine_pcm_request_channel(filter_fn, filter_data)); }