layerscape: add patches-5.4

[openwrt/staging/wigyori.git] / target / linux / layerscape / patches-5.4 / 801-audio-0026-MLK-14935-ASoC-fsl_sai-Fix-mixing-initialization-dat.patch

diff --git a/target/linux/layerscape/patches-5.4/801-audio-0026-MLK-14935-ASoC-fsl_sai-Fix-mixing-initialization-dat.patch b/target/linux/layerscape/patches-5.4/801-audio-0026-MLK-14935-ASoC-fsl_sai-Fix-mixing-initialization-dat.patch
new file mode 100644 (file)
index 0000000..a68985f
--- /dev/null
+++ b/target/linux/layerscape/patches-5.4/801-audio-0026-MLK-14935-ASoC-fsl_sai-Fix-mixing-initialization-dat.patch
@@ -0,0 +1,36 @@
+From 96412158397ca0e41db1eb7cec4f51a2280d1bf1 Mon Sep 17 00:00:00 2001
+From: Mihai Serban <mihai.serban@nxp.com>
+Date: Thu, 27 Apr 2017 18:47:42 +0300
+Subject: [PATCH] MLK-14935: ASoC: fsl_sai: Fix mixing initialization data with
+ actual audio samples
+
+When starting a playback the initialization data used to reduce underruns
+was send to the transmit data register after the DMA requests were enabled.
+This patch moves the initialization phase before enabling the DMA so the
+data is transmitted in correct order.
+
+Signed-off-by: Mihai Serban <mihai.serban@nxp.com>
+---
+ sound/soc/fsl/fsl_sai.c | 5 ++---
+ 1 file changed, 2 insertions(+), 3 deletions(-)
+
+--- a/sound/soc/fsl/fsl_sai.c
++++ b/sound/soc/fsl/fsl_sai.c
+@@ -594,15 +594,14 @@ static int fsl_sai_trigger(struct snd_pc
+       case SNDRV_PCM_TRIGGER_START:
+       case SNDRV_PCM_TRIGGER_RESUME:
+       case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+-              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_TDR0, 0x0);
+               if (tx)
+                       udelay(10);
+ 
+               regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
++                                 FSL_SAI_CSR_FRDE, FSL_SAI_CSR_FRDE);
++              regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
+                                  FSL_SAI_CSR_TERE, FSL_SAI_CSR_TERE);
+               regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
+                                  FSL_SAI_CSR_SE, FSL_SAI_CSR_SE);