ASoC: davinci-mcasp: Only disable inactive serializer

As a side effect of the following commit, the active TX serializer may get disabled which may result in distorted audio output.

ASoC: davinci-mcasp: Add support for multichannel playback (2952b27e2e463b28d5c0f04000f96b968137ca42)

For example, if a 4 channel I2S playback with two TX serializers is activated. Later on, if a recording of 2 channels, with only 1 RX serializer is started, which will also disable one of the TX serializer because max_active_serializers is only calculated for RX (recording) stream. This patch fixes this issue.

---
 sound/soc/davinci/davinci-mcasp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index 79fc4aa..1f96c9d 100644
@@ -789,7 +789,7 @@ static int mcasp_common_hw_param(struct davinci_mcasp *mcasp, int stream,
 					rx_ser < max_active_serializers) {
 			mcasp_clr_bits(mcasp, DAVINCI_MCASP_PDIR_REG, AXR(i));
 			rx_ser++;
-		} else {
+		} else if (mcasp->serial_dir[i] == INACTIVE_MODE) {
 			mcasp_mod_bits(mcasp, DAVINCI_MCASP_XRSRCTL_REG(i),
 				       SRMOD_INACTIVE, SRMOD_MASK);
 		}

2.7.4