[v3,11/18] ASoC: fsl-ssi: Transmit enable synchronization
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Message ID 1397482548-28463-12-git-send-email-mpa@pengutronix.de
State New, archived
Headers show

Commit Message

Markus Pargmann April 14, 2014, 1:35 p.m. UTC
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@pengutronix.de>
---
 sound/soc/fsl/fsl_ssi.c | 1 +
 sound/soc/fsl/fsl_ssi.h | 1 +
 2 files changed, 2 insertions(+)

Patch
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diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c
index 5c4b4bb..d5f91b1 100644
--- a/sound/soc/fsl/fsl_ssi.c
+++ b/sound/soc/fsl/fsl_ssi.c
@@ -605,6 +605,7 @@  static int _fsl_ssi_set_dai_fmt(struct fsl_ssi_private *ssi_private,
 	fsl_ssi_setup_reg_vals(ssi_private);
 
 	scr = read_ssi(&ssi->scr) & ~(CCSR_SSI_SCR_SYN | CCSR_SSI_SCR_I2S_MODE_MASK);
+	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 2e95dd7..71c3e7e 100644
--- a/sound/soc/fsl/fsl_ssi.h
+++ b/sound/soc/fsl/fsl_ssi.h
@@ -39,6 +39,7 @@  struct ccsr_ssi {
 	__be32 saccdis; /* 0x.0058 - SSI AC97 Channel Disable Register */
 };
 
+#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