[PATCH 2/2] ASoC: rt5682s: add delay time to fix pop sound issue

[shumingf at realtek.com]

From: Shuming Fan <shumingf at realtek.com>

There is a pop noise at the beginning of the capture data.
This patch adds the delay time before stereo1 ADC unmute to fix the pop sound issue.

Signed-off-by: Shuming Fan <shumingf at realtek.com>
---
 include/sound/rt5682s.h    |  1 +
 sound/soc/codecs/rt5682s.c | 34 +++++++++++++++++++++++++++++++---
 2 files changed, 32 insertions(+), 3 deletions(-)

diff --git a/include/sound/rt5682s.h b/include/sound/rt5682s.h
index accfbc2dcdd2..f18d91308b9a 100644
--- a/include/sound/rt5682s.h
+++ b/include/sound/rt5682s.h
@@ -40,6 +40,7 @@ struct rt5682s_platform_data {
 	enum rt5682s_jd_src jd_src;
 	unsigned int dmic_clk_rate;
 	unsigned int dmic_delay;
+	unsigned int amic_delay;
 	bool dmic_clk_driving_high;
 
 	const char *dai_clk_names[RT5682S_DAI_NUM_CLKS];
diff --git a/sound/soc/codecs/rt5682s.c b/sound/soc/codecs/rt5682s.c
index d49a4f68566d..efa1016831dd 100644
--- a/sound/soc/codecs/rt5682s.c
+++ b/sound/soc/codecs/rt5682s.c
@@ -1367,6 +1367,31 @@ static int rt5682s_hp_amp_event(struct snd_soc_dapm_widget *w,
 	return 0;
 }
 
+static int rt5682s_stereo1_adc_mixl_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 rt5682s_priv *rt5682s = snd_soc_component_get_drvdata(component);
+	unsigned int delay = 0;
+
+	if (rt5682s->pdata.amic_delay)
+		delay = rt5682s->pdata.amic_delay;
+
+	switch (event) {
+	case SND_SOC_DAPM_POST_PMU:
+		msleep(delay);
+		snd_soc_component_update_bits(component, RT5682S_STO1_ADC_DIG_VOL,
+			RT5682S_L_MUTE, 0);
+		break;
+	case SND_SOC_DAPM_PRE_PMD:
+		snd_soc_component_update_bits(component, RT5682S_STO1_ADC_DIG_VOL,
+			RT5682S_L_MUTE, RT5682S_L_MUTE);
+		break;
+	}
+
+	return 0;
+}
+
 static int sar_power_event(struct snd_soc_dapm_widget *w,
 		struct snd_kcontrol *kcontrol, int event)
 {
@@ -1680,9 +1705,10 @@ static const struct snd_soc_dapm_widget rt5682s_dapm_widgets[] = {
 	/* ADC Mixer */
 	SND_SOC_DAPM_SUPPLY("ADC Stereo1 Filter", RT5682S_PWR_DIG_2,
 		RT5682S_PWR_ADC_S1F_BIT, 0, set_filter_clk, SND_SOC_DAPM_PRE_PMU),
-	SND_SOC_DAPM_MIXER("Stereo1 ADC MIXL", RT5682S_STO1_ADC_DIG_VOL,
-		RT5682S_L_MUTE_SFT, 1, rt5682s_sto1_adc_l_mix,
-		ARRAY_SIZE(rt5682s_sto1_adc_l_mix)),
+	SND_SOC_DAPM_MIXER_E("Stereo1 ADC MIXL", SND_SOC_NOPM, 0, 0,
+		rt5682s_sto1_adc_l_mix, ARRAY_SIZE(rt5682s_sto1_adc_l_mix),
+		rt5682s_stereo1_adc_mixl_event,
+		SND_SOC_DAPM_PRE_PMD | SND_SOC_DAPM_POST_PMU),
 	SND_SOC_DAPM_MIXER("Stereo1 ADC MIXR", RT5682S_STO1_ADC_DIG_VOL,
 		RT5682S_R_MUTE_SFT, 1, rt5682s_sto1_adc_r_mix,
 		ARRAY_SIZE(rt5682s_sto1_adc_r_mix)),
@@ -2885,6 +2911,8 @@ static int rt5682s_parse_dt(struct rt5682s_priv *rt5682s, struct device *dev)
 		&rt5682s->pdata.dmic_clk_rate);
 	device_property_read_u32(dev, "realtek,dmic-delay-ms",
 		&rt5682s->pdata.dmic_delay);
+	device_property_read_u32(dev, "realtek,amic-delay-ms",
+		&rt5682s->pdata.amic_delay);
 
 	rt5682s->pdata.ldo1_en = of_get_named_gpio(dev->of_node,
 		"realtek,ldo1-en-gpios", 0);
-- 
2.34.1