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authorNicolin Chen2014-08-04 15:07:25 +0800
committerMark Brown2014-08-16 17:06:23 -0500
commitaf96ff5b7448dc776dc24a5c4313c6ec1ee94e53 (patch)
tree5a005e22ff52154c7fd654553178b314536724a3 /sound/soc/fsl
parent376d1a92ca587d3974d4791cdb99baa8b8e7f0dd (diff)
ASoC: fsl_sai: Set SYNC bit of TCR2 to Asynchronous Mode
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 <nicoleotsuka@gmail.com> Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'sound/soc/fsl')
-rw-r--r--sound/soc/fsl/fsl_sai.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
index 7b1eecbc4f60..3d865ad466ad 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);