[PATCH] ASoC: fsl: sai: Reduce underrun when stream starts

From: Daniel Baluta
Date: Fri Mar 08 2019 - 11:10:00 EST


From: Shengjiu Wang <shengjiu.wang@xxxxxxx>

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

Signed-off-by: Shengjiu Wang <shengjiu.wang@xxxxxxx>
Signed-off-by: Daniel Baluta <daniel.baluta@xxxxxxx>
---
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,
--
2.17.1