From ccb1fa21ef58a2ac15519bb878470762e967e8b3 Mon Sep 17 00:00:00 2001 From: Jiaxin Yu Date: Mon, 5 Aug 2019 12:56:37 +0800 Subject: [PATCH] ASoC: mediatek: mt6358: add delay after dmic clock on Most dmics produce a high level when they receive clock. The difference between power-on and memory record time is about 10ms, but the dmic needs 50ms to output normal data. This commit add 100ms delay after SoC output clock so that we can cut off the pop noise at the beginning. Signed-off-by: Jiaxin Yu Link: https://lore.kernel.org/r/1564980997-11359-1-git-send-email-jiaxin.yu@mediatek.com Signed-off-by: Mark Brown --- sound/soc/codecs/mt6358.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/sound/soc/codecs/mt6358.c b/sound/soc/codecs/mt6358.c index c17250aab2d0..bb737fd678cc 100644 --- a/sound/soc/codecs/mt6358.c +++ b/sound/soc/codecs/mt6358.c @@ -1730,6 +1730,10 @@ static int mt6358_dmic_enable(struct mt6358_priv *priv) /* UL turn on */ regmap_write(priv->regmap, MT6358_AFE_UL_SRC_CON0_L, 0x0003); + + /* Prevent pop noise form dmic hw */ + msleep(100); + return 0; } -- 2.45.2