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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: Shengjiu Wang <shengjiu.wang@freescale.com>
(cherry picked from commit 7ba8ae883d)
isee-imx_3.14.28.y
Shengjiu Wang 6 years ago
committed by Nitin Garg
parent
commit
5a1cd4e1b6
1 changed files with 8 additions and 1 deletions
  1. +8
    -1
      sound/soc/fsl/fsl_sai.c

+ 8
- 1
sound/soc/fsl/fsl_sai.c View File

@ -1,7 +1,7 @@
/*
* 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),
FSL_SAI_CSR_FRDE, FSL_SAI_CSR_FRDE);
for (i = 0; tx && i < channels; i++)
regmap_write(sai->regmap, FSL_SAI_TDR, 0x0);
if (tx)
udelay(10);
regmap_update_bits(sai->regmap, FSL_SAI_RCSR,
FSL_SAI_CSR_TERE, FSL_SAI_CSR_TERE);
regmap_update_bits(sai->regmap, FSL_SAI_TCSR,


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