FCONT=1 means On FIFO error, the SAI will continue from the
same word that caused the FIFO error to set after the FIFO
warning flag has been cleared.

Set FCONT bit in control register to avoid the channel swap
issue after SAI xrun.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
---
 sound/soc/fsl/fsl_sai.c | 5 ++++-
 sound/soc/fsl/fsl_sai.h | 1 +
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
index ab58a4461073..634168d2bb6e 100644
--- a/sound/soc/fsl/fsl_sai.c
+++ b/sound/soc/fsl/fsl_sai.c
@@ -613,6 +613,9 @@ static int fsl_sai_hw_params(struct snd_pcm_substream *substream,
 
 	val_cr4 |= FSL_SAI_CR4_FRSZ(slots);
 
+	/* Set to avoid channel swap */
+	val_cr4 |= FSL_SAI_CR4_FCONT;
+
 	/* Set to output mode to avoid tri-stated data pins */
 	if (tx)
 		val_cr4 |= FSL_SAI_CR4_CHMOD;
@@ -699,7 +702,7 @@ static int fsl_sai_hw_params(struct snd_pcm_substream *substream,
 
 	regmap_update_bits(sai->regmap, FSL_SAI_xCR4(tx, ofs),
 			   FSL_SAI_CR4_SYWD_MASK | FSL_SAI_CR4_FRSZ_MASK |
-			   FSL_SAI_CR4_CHMOD_MASK,
+			   FSL_SAI_CR4_CHMOD_MASK | FSL_SAI_CR4_FCONT_MASK,
 			   val_cr4);
 	regmap_update_bits(sai->regmap, FSL_SAI_xCR5(tx, ofs),
 			   FSL_SAI_CR5_WNW_MASK | FSL_SAI_CR5_W0W_MASK |
diff --git a/sound/soc/fsl/fsl_sai.h b/sound/soc/fsl/fsl_sai.h
index dadbd16ee394..9c4d19fe22c6 100644
--- a/sound/soc/fsl/fsl_sai.h
+++ b/sound/soc/fsl/fsl_sai.h
@@ -137,6 +137,7 @@
 
 /* SAI Transmit and Receive Configuration 4 Register */
 
+#define FSL_SAI_CR4_FCONT_MASK	BIT(28)
 #define FSL_SAI_CR4_FCONT	BIT(28)
 #define FSL_SAI_CR4_FCOMB_SHIFT BIT(26)
 #define FSL_SAI_CR4_FCOMB_SOFT  BIT(27)
-- 
2.34.1

On Mon, 30 Sep 2024 14:08:28 +0800, Shengjiu Wang wrote:
> FCONT=1 means On FIFO error, the SAI will continue from the
> same word that caused the FIFO error to set after the FIFO
> warning flag has been cleared.
> 
> Set FCONT bit in control register to avoid the channel swap
> issue after SAI xrun.
> 
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next

Thanks!

[1/1] ASoC: fsl_sai: Enable 'FIFO continue on error' FCONT bit
      commit: 72455e33173c1a00c0ce93d2b0198eb45d5f4195

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark