[alsa-devel] [PATCH 14/15] ASoC: fsl-ssi: Transmit enable synchronization

[Markus Pargmann]

When the fsl-ssi unit is used in i2s slave mode, it is possible that the
SSI unit starts transmitting data on the wrong channel. This happens
because the SSI does not synchronize with the left-right-clock by
default.

This patch enables transmit enable synchronization.

Signed-off-by: Markus Pargmann <mpa at pengutronix.de>
---
 sound/soc/fsl/fsl_ssi.c | 1 +
 sound/soc/fsl/fsl_ssi.h | 1 +
 2 files changed, 2 insertions(+)

diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c
index 56dbd77..3b0dffd 100644
--- a/sound/soc/fsl/fsl_ssi.c
+++ b/sound/soc/fsl/fsl_ssi.c
@@ -615,6 +615,7 @@ static int _fsl_ssi_set_dai_fmt(struct fsl_ssi_private *ssi_private,
 	regmap_read(regs, CCSR_SSI_SCR, &scr);
 	scr &= ~(CCSR_SSI_SCR_SYN | CCSR_SSI_SCR_I2S_MODE_MASK);
 	scr |= CCSR_SSI_SCR_NET;
+	scr |= CCSR_SSI_SCR_SYNC_TX_FS;
 
 	mask = CCSR_SSI_STCR_TXBIT0 | CCSR_SSI_STCR_TFDIR | CCSR_SSI_STCR_TXDIR |
 		CCSR_SSI_STCR_TSCKP | CCSR_SSI_STCR_TFSI | CCSR_SSI_STCR_TFSL |
diff --git a/sound/soc/fsl/fsl_ssi.h b/sound/soc/fsl/fsl_ssi.h
index d5b7feb..5065105 100644
--- a/sound/soc/fsl/fsl_ssi.h
+++ b/sound/soc/fsl/fsl_ssi.h
@@ -37,6 +37,7 @@
 #define CCSR_SSI_SACCEN			0x54
 #define CCSR_SSI_SACCDIS		0x58
 
+#define CCSR_SSI_SCR_SYNC_TX_FS		0x00001000
 #define CCSR_SSI_SCR_RFR_CLK_DIS	0x00000800
 #define CCSR_SSI_SCR_TFR_CLK_DIS	0x00000400
 #define CCSR_SSI_SCR_TCH_EN		0x00000100
-- 
1.8.5.3