[PATCH 1/3] ASoC: cs42l43: Improve analogue mic pop performance

[Charles Keepax]

Enable the quick charge feature of the micbias to ensure the bias is
more likely to be up to voltage before the recording starts. This
greatly improves the startup pop of the analogue microphones.

Signed-off-by: Charles Keepax <ckeepax@xxxxxxxxxxxxxxxxxxxxx>
---
 sound/soc/codecs/cs42l43.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sound/soc/codecs/cs42l43.c b/sound/soc/codecs/cs42l43.c
index b6238f89c789c..90c83bb33d69b 100644
--- a/sound/soc/codecs/cs42l43.c
+++ b/sound/soc/codecs/cs42l43.c
@@ -2822,6 +2822,10 @@ static int cs42l43_codec_probe(struct platform_device *pdev)
 	if (ret)
 		goto err_pm;
 
+	// Enable quick charge to improve analogue microphone startup
+	regmap_update_bits(cs42l43->regmap, CS42L43_ADC_B_CTRL1, 0x20, 0x20);
+	regmap_update_bits(cs42l43->regmap, CS42L43_ADC_B_CTRL2, 0x20, 0x20);
+
 	for (i = 0; i < ARRAY_SIZE(cs42l43_irqs); i++) {
 		ret = cs42l43_request_irq(priv, cs42l43_irqs[i].name,
 					  cs42l43_irqs[i].irq,
-- 
2.47.3