ASoC: atmel_ssc_dai: fix start event for I2S mode

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

diff --git a/sound/soc/atmel/atmel_ssc_dai.c b/sound/soc/atmel/atmel_ssc_dai.c
index 99ff35e..e691aab 100644 (file)
--- a/sound/soc/atmel/atmel_ssc_dai.c
+++ b/sound/soc/atmel/atmel_ssc_dai.c
@@ -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));