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Diffstat (limited to 'target/linux/xburst/patches-3.18/004-ASoC-JZ4740-delay-activation-of-the-DAC-to-work-arou.patch')
-rw-r--r--target/linux/xburst/patches-3.18/004-ASoC-JZ4740-delay-activation-of-the-DAC-to-work-arou.patch38
1 files changed, 38 insertions, 0 deletions
diff --git a/target/linux/xburst/patches-3.18/004-ASoC-JZ4740-delay-activation-of-the-DAC-to-work-arou.patch b/target/linux/xburst/patches-3.18/004-ASoC-JZ4740-delay-activation-of-the-DAC-to-work-arou.patch
new file mode 100644
index 0000000000..3de6ee0952
--- /dev/null
+++ b/target/linux/xburst/patches-3.18/004-ASoC-JZ4740-delay-activation-of-the-DAC-to-work-arou.patch
@@ -0,0 +1,38 @@
+From 1a1095927d224403af8ad57c354cc64521bf3081 Mon Sep 17 00:00:00 2001
+From: Paul Cercueil <paul@crapouillou.net>
+Date: Sat, 16 Jun 2012 19:36:31 +0200
+Subject: [PATCH 4/7] ASoC: JZ4740: delay activation of the DAC to work around
+ a sound bug.
+
+A proper fix of that bug would require a big rewrite of the driver,
+which (I hope) will be done eventually.
+---
+ sound/soc/codecs/jz4740.c | 9 ++++++---
+ 1 file changed, 6 insertions(+), 3 deletions(-)
+
+diff --git a/sound/soc/codecs/jz4740.c b/sound/soc/codecs/jz4740.c
+index df7c01c..6939444 100644
+--- a/sound/soc/codecs/jz4740.c
++++ b/sound/soc/codecs/jz4740.c
+@@ -249,12 +249,15 @@ static int jz4740_codec_set_bias_level(struct snd_soc_codec *codec,
+ case SND_SOC_BIAS_ON:
+ break;
+ case SND_SOC_BIAS_PREPARE:
+- mask = JZ4740_CODEC_1_VREF_DISABLE |
+- JZ4740_CODEC_1_VREF_AMP_DISABLE |
+- JZ4740_CODEC_1_HEADPHONE_POWERDOWN_M;
++ mask = JZ4740_CODEC_1_HEADPHONE_POWERDOWN_M;
+ value = 0;
+
+ regmap_update_bits(regmap, JZ4740_REG_CODEC_1, mask, value);
++
++ msleep(500);
++ mask = JZ4740_CODEC_1_VREF_DISABLE |
++ JZ4740_CODEC_1_VREF_AMP_DISABLE;
++ regmap_update_bits(regmap, JZ4740_REG_CODEC_1, mask, 0);
+ break;
+ case SND_SOC_BIAS_STANDBY:
+ /* The only way to clear the suspend flag is to reset the codec */
+--
+1.7.10.4
+