From: Shengjiu Wang shengjiu.wang@nxp.com

Write initial words into SAI FIFO to reduce the underrun error.

Signed-off-by: Shengjiu Wang shengjiu.wang@nxp.com Signed-off-by: Daniel Baluta daniel.baluta@nxp.com --- sound/soc/fsl/fsl_sai.c | 7 +++++++ 1 file changed, 7 insertions(+)

diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c index db9e0872f73d..99edbba4e8fa 100644 --- a/sound/soc/fsl/fsl_sai.c +++ b/sound/soc/fsl/fsl_sai.c @@ -503,7 +503,9 @@ 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; + unsigned int channels = substream->runtime->channels; u32 xcsr, count = 100; + int i;

/* * Asynchronous mode: Clear SYNC for both Tx and Rx. @@ -526,6 +528,11 @@ 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,