This is a note to let you know that I've just added the patch titled
ASoC: dwc: Ensure FIFOs are flushed to prevent channel swap
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
asoc-dwc-ensure-fifos-are-flushed-to-prevent-channel-swap.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3475c3d034d7f276a474c8bd53f44b48c8bf669d Mon Sep 17 00:00:00 2001
From: Andrew Jackson <Andrew.Jackson@xxxxxxx>
Date: Fri, 19 Dec 2014 16:18:05 +0000
Subject: ASoC: dwc: Ensure FIFOs are flushed to prevent channel swap
From: Andrew Jackson <Andrew.Jackson@xxxxxxx>
commit 3475c3d034d7f276a474c8bd53f44b48c8bf669d upstream.
Flush the FIFOs when the stream is prepared for use. This avoids
an inadvertent swapping of the left/right channels if the FIFOs are
not empty at startup.
Signed-off-by: Andrew Jackson <Andrew.Jackson@xxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/soc/dwc/designware_i2s.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
--- a/sound/soc/dwc/designware_i2s.c
+++ b/sound/soc/dwc/designware_i2s.c
@@ -263,6 +263,19 @@ static void dw_i2s_shutdown(struct snd_p
snd_soc_dai_set_dma_data(dai, substream, NULL);
}
+static int dw_i2s_prepare(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ i2s_write_reg(dev->i2s_base, TXFFR, 1);
+ else
+ i2s_write_reg(dev->i2s_base, RXFFR, 1);
+
+ return 0;
+}
+
static int dw_i2s_trigger(struct snd_pcm_substream *substream,
int cmd, struct snd_soc_dai *dai)
{
@@ -294,6 +307,7 @@ static struct snd_soc_dai_ops dw_i2s_dai
.startup = dw_i2s_startup,
.shutdown = dw_i2s_shutdown,
.hw_params = dw_i2s_hw_params,
+ .prepare = dw_i2s_prepare,
.trigger = dw_i2s_trigger,
};
Patches currently in stable-queue which might be from Andrew.Jackson@xxxxxxx are
queue-3.14/asoc-dwc-ensure-fifos-are-flushed-to-prevent-channel-swap.patch
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