diff options
| author | Shengjiu Wang <shengjiu.wang@freescale.com> | 2014-12-29 13:40:08 +0800 |
|---|---|---|
| committer | Jason Liu <r64343@freescale.com> | 2015-02-02 14:58:53 +0800 |
| commit | e82ba8d3e4ffb2649c143100ad0318a10e540e11 (patch) | |
| tree | 72e5f339efe3a782065f162ec3cdf5c10fa3d54a | |
| parent | 7ad070943645bfc7c6eec090eb034bb041f075d3 (diff) | |
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 7ba8ae883d84540fac5ed4147d124399537bc0b3)
| -rw-r--r-- | sound/soc/fsl/fsl_sai.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c index b58dc4776fae..137d421a1613 100644 --- a/sound/soc/fsl/fsl_sai.c +++ b/sound/soc/fsl/fsl_sai.c @@ -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, |