diff options
| author | Andrew Jackson <Andrew.Jackson@arm.com> | 2014-12-19 17:18:05 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2014-12-22 16:05:54 +0100 |
| commit | 3475c3d034d7f276a474c8bd53f44b48c8bf669d (patch) | |
| tree | 97657a04139c460ae8785d09a33b3d71a6a99514 /sound/soc/dwc | |
| parent | Linux 3.19-rc1 (diff) | |
| download | linux-3475c3d034d7f276a474c8bd53f44b48c8bf669d.tar.xz linux-3475c3d034d7f276a474c8bd53f44b48c8bf669d.zip | |
ASoC: dwc: Ensure FIFOs are flushed to prevent channel swap
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@arm.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
Diffstat (limited to 'sound/soc/dwc')
| -rw-r--r-- | sound/soc/dwc/designware_i2s.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/sound/soc/dwc/designware_i2s.c b/sound/soc/dwc/designware_i2s.c index b93168d4f648..4df19b57429c 100644 --- 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_pcm_substream *substream, 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_ops = { .startup = dw_i2s_startup, .shutdown = dw_i2s_shutdown, .hw_params = dw_i2s_hw_params, + .prepare = dw_i2s_prepare, .trigger = dw_i2s_trigger, }; |