ASoC: OMAP: Enable DMA burst mode

Improve DMA transfers by enabling Burst transaction.
Signed-off-by: NEduardo Valentin <eduardo.valentin@nokia.com>
Acked-by: NJarkko Nikula <jhnikula@gmail.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/omap/omap-pcm.c

@@ -195,6 +195,9 @@ static int omap_pcm_prepare(struct snd_pcm_substream *substream)
 	else
 		omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ);
 
+	omap_set_dma_src_burst_mode(prtd->dma_ch, OMAP_DMA_DATA_BURST_16);
+	omap_set_dma_dest_burst_mode(prtd->dma_ch, OMAP_DMA_DATA_BURST_16);
+
 	return 0;
 }