linux-kernel - [PATCH 3.2 04/24] ASoC: atmel_ssc_dai: fix start event for I2S mode

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Date:	Tue, 03 Mar 2015 22:11:28 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Bo Shen" <voice.shen@...el.com>,
	"Songjun Wu" <songjun.wu@...el.com>,
	"Mark Brown" <broonie@...nel.org>
Subject: [PATCH 3.2 04/24] ASoC: atmel_ssc_dai: fix start event for I2S mode

3.2.68-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Bo Shen <voice.shen@...el.com>

commit a43bd7e125143b875caae6d4f9938855b440faaf upstream.

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@...el.com>
Signed-off-by: Bo Shen <voice.shen@...el.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 sound/soc/atmel/atmel_ssc_dai.c | 18 ++++--------------
 1 file changed, 4 insertions(+), 14 deletions(-)

--- a/sound/soc/atmel/atmel_ssc_dai.c
+++ b/sound/soc/atmel/atmel_ssc_dai.c
@@ -341,7 +341,6 @@ static int atmel_ssc_hw_params(struct sn
 	struct atmel_pcm_dma_params *dma_params;
 	int dir, channels, bits;
 	u32 tfmr, rfmr, tcmr, rcmr;
-	int start_event;
 	int ret;
 
 	/*
@@ -460,19 +459,10 @@ static int atmel_ssc_hw_params(struct sn
 		 * 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_CKS_CLOCK);
@@ -480,14 +470,14 @@ static int atmel_ssc_hw_params(struct sn
 		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_CKS_PIN);
@@ -496,7 +486,7 @@ static int atmel_ssc_hw_params(struct sn
 			| 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));

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