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authorMark Brown <broonie@opensource.wolfsonmicro.com>2009-06-30 19:01:09 +0100
committerMark Brown <broonie@opensource.wolfsonmicro.com>2009-06-30 19:34:09 +0100
commitdf1ef7a38db21a92239c775a28f0c69124c9b454 (patch)
tree01f3c6408d17b4923a68072c1cc9f4b11ff99dbb /sound/soc
parent372a14a4a4db18751cd092aa3fe2a58216a8fc2f (diff)
ASoC: Refresh WM8974 bias configuration
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'sound/soc')
-rw-r--r--sound/soc/codecs/wm8974.c30
1 files changed, 23 insertions, 7 deletions
diff --git a/sound/soc/codecs/wm8974.c b/sound/soc/codecs/wm8974.c
index d2a36ad256c..c5d47bcd14a 100644
--- a/sound/soc/codecs/wm8974.c
+++ b/sound/soc/codecs/wm8974.c
@@ -46,6 +46,9 @@ static const u16 wm8974_reg[WM8974_CACHEREGNUM] = {
0x0000,
};
+#define WM8974_POWER1_BIASEN 0x08
+#define WM8974_POWER1_BUFIOEN 0x10
+
struct wm8974_priv {
struct snd_soc_codec codec;
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,
enum snd_soc_bias_level level)
{
+ u16 power1 = wm8974_read_reg_cache(codec, WM8974_POWER1) & ~0x3;
+
switch (level) {
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:
+ power1 |= 0x1; /* VMID 50k */
+ wm8974_write(codec, WM8974_POWER1, power1);
break;
+
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;
+
case SND_SOC_BIAS_OFF:
- wm8974_write(codec, WM8974_POWER1, 0x0);
- wm8974_write(codec, WM8974_POWER2, 0x0);
- wm8974_write(codec, WM8974_POWER3, 0x0);
+ wm8974_write(codec, WM8974_POWER1, 0);
+ wm8974_write(codec, WM8974_POWER2, 0);
+ wm8974_write(codec, WM8974_POWER3, 0);
break;
}
+
codec->bias_level = level;
return 0;
}