ASoC: DaVinci: i2s, reduce underruns by combining into 1 element

Allow the left and right 16 bit samples to be shifted out as 1
32 bit sample.

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

arch/arm/mach-davinci/include/mach/asp.h

@@ -51,6 +51,12 @@ struct snd_platform_data {
 	u32 rx_dma_offset;
 	enum dma_event_q eventq_no;	/* event queue number */
 	unsigned int codec_fmt;
+	/*
+	 * Allowing this is more efficient and eliminates left and right swaps
+	 * caused by underruns, but will swap the left and right channels
+	 * when compared to previous behavior.
+	 */
+	unsigned enable_channel_combine:1;
 
 	/* McASP specific fields */
 	int tdm_slots;