From 26b7e0e678d1330babfb9900968c4c9c35767a7c Mon Sep 17 00:00:00 2001 From: Nicolin Chen Date: Mon, 4 Aug 2014 15:07:25 +0800 Subject: [PATCH] ASoC: fsl_sai: Set SYNC bit of TCR2 to Asynchronous Mode commit 855675f6e6a65688a7f4cf45b9b5a98cf6c6f5c3 upstream. There is one design rule according to SAI's reference manual: If the transmitter bit clock and frame sync are to be used by both transmitter and receiver, the transmitter must be configured for asynchronous operation and the receiver for synchronous operation. And SYNC of TCR2 is a 2-width control bit: 00 Asynchronous mode. 01 Synchronous with receiver. 10 Synchronous with another SAI transmitter. 11 Synchronous with another SAI receiver. So the driver should have set SYNC bit of TCR2 to 0x0, and meanwhile set SYNC bit of RCR2 to 0x1 (Synchronous with transmitter). Signed-off-by: Nicolin Chen Signed-off-by: Mark Brown Signed-off-by: Arnd Bergmann Signed-off-by: Ben Hutchings --- sound/soc/fsl/fsl_sai.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c index c5a0e8af8226..60465646fed8 100644 --- a/sound/soc/fsl/fsl_sai.c +++ b/sound/soc/fsl/fsl_sai.c @@ -333,8 +333,7 @@ static int fsl_sai_trigger(struct snd_pcm_substream *substream, int cmd, * The transmitter bit clock and frame sync are to be * used by both the transmitter and receiver. */ - regmap_update_bits(sai->regmap, FSL_SAI_TCR2, FSL_SAI_CR2_SYNC, - ~FSL_SAI_CR2_SYNC); + regmap_update_bits(sai->regmap, FSL_SAI_TCR2, FSL_SAI_CR2_SYNC, 0); regmap_update_bits(sai->regmap, FSL_SAI_RCR2, FSL_SAI_CR2_SYNC, FSL_SAI_CR2_SYNC);