diff options
Diffstat (limited to 'target/linux/layerscape/patches-5.4/801-audio-0012-MLK-9974-ASoC-fsl_sai-There-is-underrun-detected-in-.patch')
| -rw-r--r-- | target/linux/layerscape/patches-5.4/801-audio-0012-MLK-9974-ASoC-fsl_sai-There-is-underrun-detected-in-.patch | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/target/linux/layerscape/patches-5.4/801-audio-0012-MLK-9974-ASoC-fsl_sai-There-is-underrun-detected-in-.patch b/target/linux/layerscape/patches-5.4/801-audio-0012-MLK-9974-ASoC-fsl_sai-There-is-underrun-detected-in-.patch new file mode 100644 index 0000000000..3b7de3c98b --- /dev/null +++ b/target/linux/layerscape/patches-5.4/801-audio-0012-MLK-9974-ASoC-fsl_sai-There-is-underrun-detected-in-.patch @@ -0,0 +1,39 @@ +From 2a7fa96feddb63d36d64336a994dc4132e8a5cd4 Mon Sep 17 00:00:00 2001 +From: Shengjiu Wang <shengjiu.wang@freescale.com> +Date: Mon, 29 Dec 2014 13:40:08 +0800 +Subject: [PATCH] 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) +(cherry picked from commit f4435f35aa2a97551d2c4a12ca316c354a880f85) +--- + sound/soc/fsl/fsl_sai.c | 7 +++++++ + 1 file changed, 7 insertions(+) + +--- a/sound/soc/fsl/fsl_sai.c ++++ b/sound/soc/fsl/fsl_sai.c +@@ -506,7 +506,9 @@ static int fsl_sai_trigger(struct snd_pc + { + 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. +@@ -529,6 +531,11 @@ static int fsl_sai_trigger(struct snd_pc + 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, |