diff options
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.patch | 38 |
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 + |