ASoC: omap-pcm: Prepare to configure the DMA data_type based on stream properties
Based on the format of the stream the omap-pcm can decide alone what data type should be used with by the sDMA. Keep the possibility for OMAP dai drivers to tell omap-pcm if they want to use different data type. This is needed for the omap-hdmi for example which needs 32bit data type even if the stream format is S16_LE. The check if (dma_data->data_type) is safe at the moment since omap-pcm does not support 8bit samples (OMAP_DMA_DATA_TYPE_S8 == 0x00). The next step is to redefine the meaning of dma_data->data_type to unblock this limitation. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Tested-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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@ -149,6 +149,24 @@ static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
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return 0;
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}
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static int omap_pcm_get_dma_type(int num_bits)
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{
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int data_type;
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switch (num_bits) {
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case 16:
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data_type = OMAP_DMA_DATA_TYPE_S16;
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break;
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case 32:
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data_type = OMAP_DMA_DATA_TYPE_S32;
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break;
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default:
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data_type = -EINVAL;
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break;
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}
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return data_type;
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}
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static int omap_pcm_prepare(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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@ -163,7 +181,16 @@ static int omap_pcm_prepare(struct snd_pcm_substream *substream)
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return 0;
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memset(&dma_params, 0, sizeof(dma_params));
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if (dma_data->data_type)
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dma_params.data_type = dma_data->data_type;
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else
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dma_params.data_type = omap_pcm_get_dma_type(
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snd_pcm_format_physical_width(runtime->format));
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if (dma_params.data_type < 0)
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return dma_params.data_type;
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dma_params.trigger = dma_data->dma_req;
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if (dma_data->packet_size)
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@ -195,7 +222,7 @@ static int omap_pcm_prepare(struct snd_pcm_substream *substream)
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* still can get an interrupt at each period bounary
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*/
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bytes = snd_pcm_lib_period_bytes(substream);
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dma_params.elem_count = bytes >> dma_data->data_type;
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dma_params.elem_count = bytes >> dma_params.data_type;
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dma_params.frame_count = runtime->periods;
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omap_set_dma_params(prtd->dma_ch, &dma_params);
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