target/linux/xburst/patches-3.18/004-ASoC-JZ4740-delay-activation-of-the-DAC-to-work-arou.patch

   1 From 1a1095927d224403af8ad57c354cc64521bf3081 Mon Sep 17 00:00:00 2001
   2 From: Paul Cercueil <paul@crapouillou.net>
   3 Date: Sat, 16 Jun 2012 19:36:31 +0200
   4 Subject: [PATCH 4/7] ASoC: JZ4740: delay activation of the DAC to work around
   5  a sound bug.
   6
   7 A proper fix of that bug would require a big rewrite of the driver,
   8 which (I hope) will be done eventually.
   9 ---
  10  sound/soc/codecs/jz4740.c |    9 ++++++---
  11  1 file changed, 6 insertions(+), 3 deletions(-)
  12
  13 --- a/sound/soc/codecs/jz4740.c
  14 +++ b/sound/soc/codecs/jz4740.c
  15 @@ -249,12 +249,15 @@ static int jz4740_codec_set_bias_level(s
  16         case SND_SOC_BIAS_ON:
  17                 break;
  18         case SND_SOC_BIAS_PREPARE:
  19 -               mask = JZ4740_CODEC_1_VREF_DISABLE |
  20 -                               JZ4740_CODEC_1_VREF_AMP_DISABLE |
  21 -                               JZ4740_CODEC_1_HEADPHONE_POWERDOWN_M;
  22 +               mask = JZ4740_CODEC_1_HEADPHONE_POWERDOWN_M;
  23                 value = 0;
  24
  25                 regmap_update_bits(regmap, JZ4740_REG_CODEC_1, mask, value);
  26 +
  27 +               msleep(500);
  28 +               mask = JZ4740_CODEC_1_VREF_DISABLE |
  29 +                                               JZ4740_CODEC_1_VREF_AMP_DISABLE;
  30 +               regmap_update_bits(regmap, JZ4740_REG_CODEC_1, mask, 0);
  31                 break;
  32         case SND_SOC_BIAS_STANDBY:
  33                 /* The only way to clear the suspend flag is to reset the codec */