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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>
(cherry picked from commit af96ff5b74)
isee-imx_3.14.28.y
Nicolin Chen 6 years ago
committed by Nitin Garg
parent
commit
f8cc69e56e
1 changed files with 1 additions and 2 deletions
  1. +1
    -2
      sound/soc/fsl/fsl_sai.c

+ 1
- 2
sound/soc/fsl/fsl_sai.c View File

@ -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);


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