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ASoC: Manage VMID mode for WM8990
A small additional power saving can be achieved for the WM8990 by maintaining VMID using a 2*250k divider when in standby mode. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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1 changed files with 11 additions and 0 deletions
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@ -1222,8 +1222,14 @@ static int wm8990_set_bias_level(struct snd_soc_codec *codec,
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switch (level) {
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case SND_SOC_BIAS_ON:
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break;
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case SND_SOC_BIAS_PREPARE:
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/* VMID=2*50k */
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val = wm8990_read_reg_cache(codec, WM8990_POWER_MANAGEMENT_1) &
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~WM8990_VMID_MODE_MASK;
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wm8990_write(codec, WM8990_POWER_MANAGEMENT_1, val | 0x2);
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break;
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case SND_SOC_BIAS_STANDBY:
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if (codec->bias_level == SND_SOC_BIAS_OFF) {
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/* Enable all output discharge bits */
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@ -1278,6 +1284,11 @@ static int wm8990_set_bias_level(struct snd_soc_codec *codec,
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wm8990_write(codec, WM8990_EXT_CTL1, 0xa003);
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wm8990_write(codec, WM8990_EXT_ACCESS_ENA, 0);
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}
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/* VMID=2*250k */
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val = wm8990_read_reg_cache(codec, WM8990_POWER_MANAGEMENT_1) &
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~WM8990_VMID_MODE_MASK;
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wm8990_write(codec, WM8990_POWER_MANAGEMENT_1, val | 0x4);
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break;
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case SND_SOC_BIAS_OFF:
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