[alsa-devel] Applied "ASoC: fsl_sai: derive TX FIFO watermark from FIFO depth" to the asoc tree

[Mark Brown]

The patch

   ASoC: fsl_sai: derive TX FIFO watermark from FIFO depth

has been applied to the asoc tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-5.4

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

>From 8decc2428f4684ae35afec7c9aed92fba9fc4696 Mon Sep 17 00:00:00 2001
From: Lucas Stach <l.stach at pengutronix.de>
Date: Wed, 17 Jul 2019 12:56:34 +0200
Subject: [PATCH] ASoC: fsl_sai: derive TX FIFO watermark from FIFO depth

The DMA request schould be triggered as soon as the FIFO has space
for another burst. As different versions of the SAI block have
different FIFO sizes, the watrmark level needs to be derived from
version specific data.

Signed-off-by: Lucas Stach <l.stach at pengutronix.de>
Tested-by: Angus Ainslie <angus at akkea.ca>
Reviewed-by: Angus Ainslie <angus at akkea.ca>
Link: https://lore.kernel.org/r/20190717105635.18514-3-l.stach@pengutronix.de
Signed-off-by: Mark Brown <broonie at kernel.org>
---
 sound/soc/fsl/fsl_sai.c | 4 +++-
 sound/soc/fsl/fsl_sai.h | 1 +
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
index ed0432e7327a..1d1a447163e3 100644
--- a/sound/soc/fsl/fsl_sai.c
+++ b/sound/soc/fsl/fsl_sai.c
@@ -640,7 +640,7 @@ static int fsl_sai_dai_probe(struct snd_soc_dai *cpu_dai)
 	regmap_write(sai->regmap, FSL_SAI_RCSR, 0);
 
 	regmap_update_bits(sai->regmap, FSL_SAI_TCR1, FSL_SAI_CR1_RFW_MASK,
-			   FSL_SAI_MAXBURST_TX * 2);
+			   sai->soc_data->fifo_depth - FSL_SAI_MAXBURST_TX);
 	regmap_update_bits(sai->regmap, FSL_SAI_RCR1, FSL_SAI_CR1_RFW_MASK,
 			   FSL_SAI_MAXBURST_RX - 1);
 
@@ -913,10 +913,12 @@ static int fsl_sai_remove(struct platform_device *pdev)
 
 static const struct fsl_sai_soc_data fsl_sai_vf610_data = {
 	.use_imx_pcm = false,
+	.fifo_depth = 32,
 };
 
 static const struct fsl_sai_soc_data fsl_sai_imx6sx_data = {
 	.use_imx_pcm = true,
+	.fifo_depth = 32,
 };
 
 static const struct of_device_id fsl_sai_ids[] = {
diff --git a/sound/soc/fsl/fsl_sai.h b/sound/soc/fsl/fsl_sai.h
index 83e2bfe05b1b..7c1ef671da28 100644
--- a/sound/soc/fsl/fsl_sai.h
+++ b/sound/soc/fsl/fsl_sai.h
@@ -128,6 +128,7 @@
 
 struct fsl_sai_soc_data {
 	bool use_imx_pcm;
+	unsigned int fifo_depth;
 };
 
 struct fsl_sai {
-- 
2.20.1