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ASoC: atmel_ssc_dai: fix start event for I2S mode

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According to the I2S specification information as following:
  - WS = 0, channel 1 (left)
  - WS = 1, channel 2 (right)
So, the start event should be TF/RF falling edge.

Reported-by: Songjun Wu <songjun.wu@atmel.com>
Signed-off-by: Bo Shen <voice.shen@atmel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
This commit is contained in:
Bo Shen 2015-01-20 15:43:16 +08:00 committed by Mark Brown
parent 97bf6af1f9
commit a43bd7e125
1 changed files with 4 additions and 14 deletions
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18
sound/soc/atmel/atmel_ssc_dai.c
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@ -348,7 +348,6 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
struct atmel_pcm_dma_params *dma_params;
int dir, channels, bits;
u32 tfmr, rfmr, tcmr, rcmr;
int start_event;
int ret;
int fslen, fslen_ext;
@ -457,19 +456,10 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
* The SSC transmit clock is obtained from the BCLK signal on
* on the TK line, and the SSC receive clock is
* generated from the transmit clock.
*
* For single channel data, one sample is transferred
* on the falling edge of the LRC clock.
* For two channel data, one sample is
* transferred on both edges of the LRC clock.
*/
start_event = ((channels == 1)
? SSC_START_FALLING_RF
: SSC_START_EDGE_RF);
rcmr = SSC_BF(RCMR_PERIOD, 0)
| SSC_BF(RCMR_STTDLY, START_DELAY)
| SSC_BF(RCMR_START, start_event)
| SSC_BF(RCMR_START, SSC_START_FALLING_RF)
| SSC_BF(RCMR_CKI, SSC_CKI_RISING)
| SSC_BF(RCMR_CKO, SSC_CKO_NONE)
| SSC_BF(RCMR_CKS, ssc->clk_from_rk_pin ?
@ -478,14 +468,14 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
rfmr = SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
| SSC_BF(RFMR_FSOS, SSC_FSOS_NONE)
| SSC_BF(RFMR_FSLEN, 0)
| SSC_BF(RFMR_DATNB, 0)
| SSC_BF(RFMR_DATNB, (channels - 1))
| SSC_BIT(RFMR_MSBF)
| SSC_BF(RFMR_LOOP, 0)
| SSC_BF(RFMR_DATLEN, (bits - 1));
tcmr = SSC_BF(TCMR_PERIOD, 0)
| SSC_BF(TCMR_STTDLY, START_DELAY)
| SSC_BF(TCMR_START, start_event)
| SSC_BF(TCMR_START, SSC_START_FALLING_RF)
| SSC_BF(TCMR_CKI, SSC_CKI_FALLING)
| SSC_BF(TCMR_CKO, SSC_CKO_NONE)
| SSC_BF(TCMR_CKS, ssc->clk_from_rk_pin ?
@ -495,7 +485,7 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
| SSC_BF(TFMR_FSDEN, 0)
| SSC_BF(TFMR_FSOS, SSC_FSOS_NONE)
| SSC_BF(TFMR_FSLEN, 0)
| SSC_BF(TFMR_DATNB, 0)
| SSC_BF(TFMR_DATNB, (channels - 1))
| SSC_BIT(TFMR_MSBF)
| SSC_BF(TFMR_DATDEF, 0)
| SSC_BF(TFMR_DATLEN, (bits - 1));