openwrtv3/target/linux/xburst/patches-3.18/004-ASoC-JZ4740-delay-activation-of-the-DAC-to-work-arou.patch
Jonas Gorski 76d079204d kernel: update 3.18 to 3.18.14
Changelogs:

* https://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.18.12
* https://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.18.13
* https://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.18.14

Build tested on brcm63xx and ipq806x, runtested on brcm63xx.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

SVN-Revision: 45711
2015-05-21 19:32:46 +00:00

33 lines
1.1 KiB
Diff

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(-)
--- a/sound/soc/codecs/jz4740.c
+++ b/sound/soc/codecs/jz4740.c
@@ -249,12 +249,15 @@ static int jz4740_codec_set_bias_level(s
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 */