Commit 5a1cd4e1 by Shengjiu Wang Committed by Nitin Garg

MLK-9974: ASoC: fsl_sai: There is underrun detected in the beginning sometimes

Write initial words to SAI FIFO to reduce underrun error Signed-off-by: 's avatarShengjiu Wang <> (cherry picked from commit 7ba8ae883d84540fac5ed4147d124399537bc0b3)
parent 98145d81
* Freescale ALSA SoC Digital Audio Interface (SAI) driver.
* Copyright 2012-2014 Freescale Semiconductor, Inc.
* Copyright 2012-2015 Freescale Semiconductor, Inc.
* This program is free software, you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
......@@ -438,7 +438,9 @@ static int fsl_sai_trigger(struct snd_pcm_substream *substream, int cmd,
struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
u8 channels = substream->runtime->channels;
u32 xcsr, count = 100;
int i;
* Asynchronous mode: Clear SYNC for both Tx and Rx.
......@@ -460,6 +462,11 @@ static int fsl_sai_trigger(struct snd_pcm_substream *substream, int cmd,
regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
for (i = 0; tx && i < channels; i++)
regmap_write(sai->regmap, FSL_SAI_TDR, 0x0);
if (tx)
regmap_update_bits(sai->regmap, FSL_SAI_RCSR,
regmap_update_bits(sai->regmap, FSL_SAI_TCSR,
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