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ASoC: Further optimise WM8400 bias configuration sequence 

The active discharge does not bring sufficient benefit to justify the
lengthy times involved so don't do that.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2009-03-18 15:19:10 +00:00
parent da88b48b84
commit e3598f6e42
1 changed files with 2 additions and 25 deletions
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27
sound/soc/codecs/wm8400.c
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@ -1096,45 +1096,22 @@ static int wm8400_set_bias_level(struct snd_soc_codec *codec,
wm8400_write(codec, WM8400_POWER_MANAGEMENT_1,
WM8400_CODEC_ENA | WM8400_SYSCLK_ENA);
/* Enable all output discharge bits */
wm8400_write(codec, WM8400_ANTIPOP1, WM8400_DIS_LLINE |
WM8400_DIS_RLINE | WM8400_DIS_OUT3 |
WM8400_DIS_OUT4 | WM8400_DIS_LOUT |
WM8400_DIS_ROUT);
/* Enable POBCTRL, SOFT_ST, VMIDTOG and BUFDCOPEN */
wm8400_write(codec, WM8400_ANTIPOP2, WM8400_SOFTST |
WM8400_BUFDCOPEN | WM8400_POBCTRL);
msleep(500);
/* Enable outputs */
val = wm8400_read(codec, WM8400_POWER_MANAGEMENT_1);
val |= WM8400_SPK_ENA | WM8400_OUT3_ENA |
WM8400_OUT4_ENA | WM8400_LOUT_ENA |
WM8400_ROUT_ENA;
wm8400_write(codec, WM8400_POWER_MANAGEMENT_1, val);
/* disable all output discharge bits */
wm8400_write(codec, WM8400_ANTIPOP1, 0);
msleep(50);
/* Enable VREF & VMID at 2x50k */
val = wm8400_read(codec, WM8400_POWER_MANAGEMENT_1);
val |= 0x2 | WM8400_VREF_ENA;
wm8400_write(codec, WM8400_POWER_MANAGEMENT_1, val);
msleep(600);
/* Enable BUFIOEN */
wm8400_write(codec, WM8400_ANTIPOP2, WM8400_SOFTST |
WM8400_BUFDCOPEN | WM8400_POBCTRL |
WM8400_BUFIOEN);
/* Disable outputs */
val &= ~(WM8400_SPK_ENA | WM8400_OUT3_ENA |
WM8400_OUT4_ENA | WM8400_LOUT_ENA |
WM8400_ROUT_ENA);
wm8400_write(codec, WM8400_POWER_MANAGEMENT_1, val);
/* disable POBCTRL, SOFT_ST and BUFDCOPEN */
wm8400_write(codec, WM8400_ANTIPOP2, WM8400_BUFIOEN);
}