target/linux/xburst/patches-3.10/006-ASoC-JZ4740-delay-activation-of-the-DAC-to-work-arou.patch

   1 From 46c628ae74578382ec324405dd4caafdbf3838bd 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 06/16] ASoC: JZ4740: delay activation of the DAC to work
   5  around 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 Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
  11 ---
  12  sound/soc/codecs/jz4740.c |    9 ++++++---
  13  1 file changed, 6 insertions(+), 3 deletions(-)
  14
  15 diff --git a/sound/soc/codecs/jz4740.c b/sound/soc/codecs/jz4740.c
  16 index 5f607b3..76ff580 100644
  17 --- a/sound/soc/codecs/jz4740.c
  18 +++ b/sound/soc/codecs/jz4740.c
  19 @@ -249,12 +249,15 @@ static int jz4740_codec_set_bias_level(struct snd_soc_codec *codec,
  20         case SND_SOC_BIAS_ON:
  21                 break;
  22         case SND_SOC_BIAS_PREPARE:
  23 -               mask = JZ4740_CODEC_1_VREF_DISABLE |
  24 -                               JZ4740_CODEC_1_VREF_AMP_DISABLE |
  25 -                               JZ4740_CODEC_1_HEADPHONE_POWERDOWN_M;
  26 +               mask = JZ4740_CODEC_1_HEADPHONE_POWERDOWN_M;
  27                 value = 0;
  28
  29                 regmap_update_bits(regmap, JZ4740_REG_CODEC_1, mask, value);
  30 +
  31 +               msleep(500);
  32 +               mask = JZ4740_CODEC_1_VREF_DISABLE |
  33 +                                               JZ4740_CODEC_1_VREF_AMP_DISABLE;
  34 +               regmap_update_bits(regmap, JZ4740_REG_CODEC_1, mask, 0);
  35                 break;
  36         case SND_SOC_BIAS_STANDBY:
  37                 /* The only way to clear the suspend flag is to reset the codec */
  38 --
  39 1.7.10.4
  40