[PATCH v2 2/3] ASoC: nau8821: Add delay control for ADC

[Seven Lee]

Change the original fixed delay to the assignment from the property.
It will make it more flexible to different platforms to avoid pop
noise at the beginning of recording.

Signed-off-by: Seven Lee <wtli@xxxxxxxxxxx>
---
 sound/soc/codecs/nau8821.c | 11 +++++++++--
 sound/soc/codecs/nau8821.h |  1 +
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/sound/soc/codecs/nau8821.c b/sound/soc/codecs/nau8821.c
index 012e347e6391..fec669e00a10 100644
--- a/sound/soc/codecs/nau8821.c
+++ b/sound/soc/codecs/nau8821.c
@@ -511,7 +511,7 @@ static int nau8821_left_adc_event(struct snd_soc_dapm_widget *w,
 
 	switch (event) {
 	case SND_SOC_DAPM_POST_PMU:
-		msleep(125);
+		msleep(nau8821->adc_delay);
 		regmap_update_bits(nau8821->regmap, NAU8821_R01_ENA_CTRL,
 			NAU8821_EN_ADCL, NAU8821_EN_ADCL);
 		break;
@@ -535,7 +535,7 @@ static int nau8821_right_adc_event(struct snd_soc_dapm_widget *w,
 
 	switch (event) {
 	case SND_SOC_DAPM_POST_PMU:
-		msleep(125);
+		msleep(nau8821->adc_delay);
 		regmap_update_bits(nau8821->regmap, NAU8821_R01_ENA_CTRL,
 			NAU8821_EN_ADCR, NAU8821_EN_ADCR);
 		break;
@@ -1697,6 +1697,7 @@ static void nau8821_print_device_properties(struct nau8821 *nau8821)
 	dev_dbg(dev, "dmic-clk-threshold:       %d\n",
 		nau8821->dmic_clk_threshold);
 	dev_dbg(dev, "key_enable:       %d\n", nau8821->key_enable);
+	dev_dbg(dev, "adc-delay-ms:		%d\n", nau8821->adc_delay);
 }
 
 static int nau8821_read_device_properties(struct device *dev,
@@ -1742,6 +1743,12 @@ static int nau8821_read_device_properties(struct device *dev,
 		&nau8821->dmic_slew_rate);
 	if (ret)
 		nau8821->dmic_slew_rate = 0;
+	ret = device_property_read_u32(dev, "nuvoton,adc-delay-ms",
+		&nau8821->adc_delay);
+	if (ret)
+		nau8821->adc_delay = 125;
+	if (nau8821->adc_delay < 125 || nau8821->adc_delay > 500)
+		dev_warn(dev, "Please set the suitable delay time!\n");
 
 	return 0;
 }
diff --git a/sound/soc/codecs/nau8821.h b/sound/soc/codecs/nau8821.h
index 62eaad130b2e..f0935ffafcbe 100644
--- a/sound/soc/codecs/nau8821.h
+++ b/sound/soc/codecs/nau8821.h
@@ -577,6 +577,7 @@ struct nau8821 {
 	int dmic_clk_threshold;
 	int dmic_slew_rate;
 	int key_enable;
+	int adc_delay;
 };
 
 int nau8821_enable_jack_detect(struct snd_soc_component *component,
-- 
2.25.1