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ASoC: Refresh WM8974 bias configuration

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Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown
2009-06-30 19:01:09 +01:00
parent 372a14a4a4
commit df1ef7a38d
1 changed files with 23 additions and 7 deletions
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30
sound/soc/codecs/wm8974.c
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@@ -46,6 +46,9 @@ static const u16 wm8974_reg[WM8974_CACHEREGNUM] = {
0x0000, 0x0000,
}; };
#define WM8974_POWER1_BIASEN 0x08
#define WM8974_POWER1_BUFIOEN 0x10
struct wm8974_priv { struct wm8974_priv {
struct snd_soc_codec codec; struct snd_soc_codec codec;
u16 reg_cache[WM8974_CACHEREGNUM]; u16 reg_cache[WM8974_CACHEREGNUM];
@@ -528,22 +531,35 @@ static int wm8974_mute(struct snd_soc_dai *dai, int mute)
static int wm8974_set_bias_level(struct snd_soc_codec *codec, static int wm8974_set_bias_level(struct snd_soc_codec *codec,
enum snd_soc_bias_level level) enum snd_soc_bias_level level)
{ {
u16 power1 = wm8974_read_reg_cache(codec, WM8974_POWER1) & ~0x3;
switch (level) { switch (level) {
case SND_SOC_BIAS_ON: case SND_SOC_BIAS_ON:
wm8974_write(codec, WM8974_POWER1, 0x1ff);
wm8974_write(codec, WM8974_POWER2, 0x1ff);
wm8974_write(codec, WM8974_POWER3, 0x1ff);
break;
case SND_SOC_BIAS_PREPARE: case SND_SOC_BIAS_PREPARE:
power1 |= 0x1; /* VMID 50k */
wm8974_write(codec, WM8974_POWER1, power1);
break; break;
case SND_SOC_BIAS_STANDBY: case SND_SOC_BIAS_STANDBY:
power1 |= WM8974_POWER1_BIASEN | WM8974_POWER1_BUFIOEN;
if (codec->bias_level == SND_SOC_BIAS_OFF) {
/* Initial cap charge at VMID 5k */
wm8974_write(codec, WM8974_POWER1, power1 | 0x3);
mdelay(100);
}
power1 |= 0x2; /* VMID 500k */
wm8974_write(codec, WM8974_POWER1, power1);
break; break;
case SND_SOC_BIAS_OFF: case SND_SOC_BIAS_OFF:
wm8974_write(codec, WM8974_POWER1, 0x0); wm8974_write(codec, WM8974_POWER1, 0);
wm8974_write(codec, WM8974_POWER2, 0x0); wm8974_write(codec, WM8974_POWER2, 0);
wm8974_write(codec, WM8974_POWER3, 0x0); wm8974_write(codec, WM8974_POWER3, 0);
break; break;
} }
codec->bias_level = level; codec->bias_level = level;
return 0; return 0;
} }