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
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@ -263,6 +263,19 @@ static void dw_i2s_shutdown(struct snd_pcm_substream *substream,
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snd_soc_dai_set_dma_data(dai, substream, NULL);
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}
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static int dw_i2s_prepare(struct snd_pcm_substream *substream,
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struct snd_soc_dai *dai)
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{
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struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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i2s_write_reg(dev->i2s_base, TXFFR, 1);
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else
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i2s_write_reg(dev->i2s_base, RXFFR, 1);
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return 0;
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}
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static int dw_i2s_trigger(struct snd_pcm_substream *substream,
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int cmd, struct snd_soc_dai *dai)
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{
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@ -294,6 +307,7 @@ static struct snd_soc_dai_ops dw_i2s_dai_ops = {
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.startup = dw_i2s_startup,
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.shutdown = dw_i2s_shutdown,
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.hw_params = dw_i2s_hw_params,
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.prepare = dw_i2s_prepare,
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.trigger = dw_i2s_trigger,
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};
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