diff options
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/soc/codecs/wm8974.c | 30 |
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; } |