Adding pre-charge actions to make FEPGA power stable faster. It improve the recording quality at the beginning. Thus, it is also meaningfully to decrease the final adc delay time.

Signed-off-by: David Lin CTLIN0@nuvoton.com --- sound/soc/codecs/nau8825.c | 30 ++++++++++++++++++++++++++++-- sound/soc/codecs/nau8825.h | 7 +++++++ 2 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/sound/soc/codecs/nau8825.c b/sound/soc/codecs/nau8825.c index 775c8e0cb09e..cc3e18207c42 100644 --- a/sound/soc/codecs/nau8825.c +++ b/sound/soc/codecs/nau8825.c @@ -911,6 +911,32 @@ static bool nau8825_volatile_reg(struct device *dev, unsigned int reg) } }

+static int nau8825_fepga_event(struct snd_soc_dapm_widget *w, + struct snd_kcontrol *kcontrol, int event) +{ + struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm); + struct nau8825 *nau8825 = snd_soc_component_get_drvdata(component); + + switch (event) { + case SND_SOC_DAPM_POST_PMU: + regmap_update_bits(nau8825->regmap, NAU8825_REG_FEPGA, + NAU8825_ACDC_CTRL_MASK, + NAU8825_ACDC_VREF_MICP | NAU8825_ACDC_VREF_MICN); + regmap_update_bits(nau8825->regmap, NAU8825_REG_BOOST, + NAU8825_DISCHRG_EN, NAU8825_DISCHRG_EN); + msleep(40); + regmap_update_bits(nau8825->regmap, NAU8825_REG_BOOST, + NAU8825_DISCHRG_EN, 0); + regmap_update_bits(nau8825->regmap, NAU8825_REG_FEPGA, + NAU8825_ACDC_CTRL_MASK, 0); + break; + default: + break; + } + + return 0; +} + static int nau8825_adc_event(struct snd_soc_dapm_widget *w, struct snd_kcontrol *kcontrol, int event) { @@ -1127,8 +1153,8 @@ static const struct snd_soc_dapm_widget nau8825_dapm_widgets[] = { SND_SOC_DAPM_INPUT("MIC"), SND_SOC_DAPM_MICBIAS("MICBIAS", NAU8825_REG_MIC_BIAS, 8, 0),

- SND_SOC_DAPM_PGA("Frontend PGA", NAU8825_REG_POWER_UP_CONTROL, 14, 0, - NULL, 0), + SND_SOC_DAPM_PGA_E("Frontend PGA", NAU8825_REG_POWER_UP_CONTROL, 14, 0, + NULL, 0, nau8825_fepga_event, SND_SOC_DAPM_POST_PMU),

SND_SOC_DAPM_ADC_E("ADC", NULL, SND_SOC_NOPM, 0, 0, nau8825_adc_event, SND_SOC_DAPM_POST_PMU | diff --git a/sound/soc/codecs/nau8825.h b/sound/soc/codecs/nau8825.h index 44b62bc3880f..38ce052aed50 100644 --- a/sound/soc/codecs/nau8825.h +++ b/sound/soc/codecs/nau8825.h @@ -442,10 +442,17 @@ /* BOOST (0x76) */ #define NAU8825_PRECHARGE_DIS (1 << 13) #define NAU8825_GLOBAL_BIAS_EN (1 << 12) +#define NAU8825_DISCHRG_EN (1 << 11) #define NAU8825_HP_BOOST_DIS (1 << 9) #define NAU8825_HP_BOOST_G_DIS (1 << 8) #define NAU8825_SHORT_SHUTDOWN_EN (1 << 6)

+/* FEPGA (0x77) */ +#define NAU8825_ACDC_CTRL_SFT 14 +#define NAU8825_ACDC_CTRL_MASK (0x3 << NAU8825_ACDC_CTRL_SFT) +#define NAU8825_ACDC_VREF_MICP (0x1 << NAU8825_ACDC_CTRL_SFT) +#define NAU8825_ACDC_VREF_MICN (0x2 << NAU8825_ACDC_CTRL_SFT) + /* POWER_UP_CONTROL (0x7f) */ #define NAU8825_POWERUP_INTEGR_R (1 << 5) #define NAU8825_POWERUP_INTEGR_L (1 << 4)