From 984af25ece97bcf7c1a5b20e42eedc6fdff461b0 Mon Sep 17 00:00:00 2001
From: Xing Zheng <zhengxing@rock-chips.com>
Date: Thu, 28 Mar 2019 15:49:29 +0800
Subject: [PATCH] ASoC: rk3308_codec: add some delay to wait micbias is stable

To avoid bring some noise dues to unstable micbias.

Change-Id: I0127505f0adeacda5d852ae3cefae2fb5f4ee9d2
Signed-off-by: Xing Zheng <zhengxing@rock-chips.com>
---
 sound/soc/codecs/rk3308_codec.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/soc/codecs/rk3308_codec.c b/sound/soc/codecs/rk3308_codec.c
index 48a63a670514..6f0e5843cafc 100644
--- a/sound/soc/codecs/rk3308_codec.c
+++ b/sound/soc/codecs/rk3308_codec.c
@@ -2879,6 +2879,9 @@ static int rk3308_codec_micbias_enable(struct rk3308_codec_priv *rk3308,
 				   RK3308_ADC_MIC_BIAS_BUF_EN,
 				   RK3308_ADC_MIC_BIAS_BUF_EN);
 
+	/* waiting micbias stabled*/
+	mdelay(50);
+
 	rk3308->enable_micbias = true;
 
 	return 0;