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Subject[PATCH 3/3] ASoC: tlv320aic32x4: Enable fast charge
Date
At power-up the analog circuits may take up to one full second before
being charged with the default configuration. Using the analog blocks
before they are ready generates a *very* crappy sound.

Enable the fast charge feature, which will require a bit more power
than normal charge but will definitely speed up the starting operation
by shrinking this delay to up to 40 ms.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
---
sound/soc/codecs/tlv320aic32x4.c | 8 ++++++++
sound/soc/codecs/tlv320aic32x4.h | 7 +++++++
2 files changed, 15 insertions(+)

diff --git a/sound/soc/codecs/tlv320aic32x4.c b/sound/soc/codecs/tlv320aic32x4.c
index 7a1ffbaf48be..5fb8ba109bc9 100644
--- a/sound/soc/codecs/tlv320aic32x4.c
+++ b/sound/soc/codecs/tlv320aic32x4.c
@@ -1009,6 +1009,14 @@ static int aic32x4_component_probe(struct snd_soc_component *component)
AIC32X4_LADC_EN | AIC32X4_RADC_EN);
snd_soc_component_write(component, AIC32X4_ADCSETUP, tmp_reg);

+ /*
+ * Enable the fast charging feature and ensure the needed 40ms ellapsed
+ * before using the analog circuits.
+ */
+ snd_soc_component_write(component, AIC32X4_REFPOWERUP,
+ AIC32X4_REFPOWERUP_40MS);
+ msleep(40);
+
return 0;
}

diff --git a/sound/soc/codecs/tlv320aic32x4.h b/sound/soc/codecs/tlv320aic32x4.h
index 38f47704bb75..7550122e9f8a 100644
--- a/sound/soc/codecs/tlv320aic32x4.h
+++ b/sound/soc/codecs/tlv320aic32x4.h
@@ -96,6 +96,7 @@ int aic32x4_register_clocks(struct device *dev, const char *mclk_name);
#define AIC32X4_FLOATINGINPUT AIC32X4_REG(1, 58)
#define AIC32X4_LMICPGAVOL AIC32X4_REG(1, 59)
#define AIC32X4_RMICPGAVOL AIC32X4_REG(1, 60)
+#define AIC32X4_REFPOWERUP AIC32X4_REG(1, 123)

/* Bits, masks, and shifts */

@@ -205,6 +206,12 @@ int aic32x4_register_clocks(struct device *dev, const char *mclk_name);
#define AIC32X4_RMICPGANIN_IN1L_10K 0x10
#define AIC32X4_RMICPGANIN_CM1R_10K 0x40

+/* AIC32X4_REFPOWERUP */
+#define AIC32X4_REFPOWERUP_SLOW 0x04
+#define AIC32X4_REFPOWERUP_40MS 0x05
+#define AIC32X4_REFPOWERUP_80MS 0x06
+#define AIC32X4_REFPOWERUP_120MS 0x07
+
/* Common mask and enable for all of the dividers */
#define AIC32X4_DIVEN BIT(7)
#define AIC32X4_DIV_MASK GENMASK(6, 0)
--
2.20.1
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