ASoC: add support for separate codec DAIs to the fsl_dma driver

Some codecs have separate DAIs for playback and capture, so the DMA driver
should allocate a DMA buffer only for the streams that are valid when the
driver is opened.
Signed-off-by: Timur Tabi <timur@freescale.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/fsl/fsl_dma.c

@@ -303,22 +303,30 @@ static int fsl_dma_new(struct snd_card *card, struct snd_soc_dai *dai,
 	if (!card->dev->coherent_dma_mask)
 		card->dev->coherent_dma_mask = fsl_dma_dmamask;
 
+	/* Some codecs have separate DAIs for playback and capture, so we
+	 * should allocate a DMA buffer only for the streams that are valid.
+	 */
+
+	if (dai->driver->playback.channels_min) {
 		ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, card->dev,
 			fsl_dma_hardware.buffer_bytes_max,
 			&pcm->streams[0].substream->dma_buffer);
 		if (ret) {
-		dev_err(card->dev, "can't allocate playback dma buffer\n");
+			dev_err(card->dev, "can't alloc playback dma buffer\n");
 			return ret;
 		}
+	}
 
+	if (dai->driver->capture.channels_min) {
 		ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, card->dev,
 			fsl_dma_hardware.buffer_bytes_max,
 			&pcm->streams[1].substream->dma_buffer);
 		if (ret) {
 			snd_dma_free_pages(&pcm->streams[0].substream->dma_buffer);
-		dev_err(card->dev, "can't allocate capture dma buffer\n");
+			dev_err(card->dev, "can't alloc capture dma buffer\n");
 			return ret;
 		}
+	}
 
 	return 0;
 }