ASoC: tlv320adcx140: Idle the device while writing registers

It was observed that if the device was active and register writes were
performed there were some unwanted behaviors particularly when writing
the word length and some filter options. So when writing to the device
the device should be placed in sleep mode and then exit sleep mode once
the register update is complete.
Signed-off-by: Dan Murphy <dmurphy@ti.com>
Link: https://lore.kernel.org/r/20200915190606.1744-1-dmurphy@ti.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/tlv320adcx140.c

@@ -30,7 +30,7 @@ struct adcx140_priv {
 	struct regmap *regmap;
 	struct device *dev;
 
-	int micbias_vg;
+	bool micbias_vg;
 
 	unsigned int dai_fmt;
 	unsigned int tdm_delay;
@@ -614,11 +614,26 @@ static int adcx140_reset(struct adcx140_priv *adcx140)
 	return ret;
 }
 
+static void adcx140_pwr_ctrl(struct adcx140_priv *adcx140, bool power_state)
+{
+	int pwr_ctrl = 0;
+
+	if (power_state)
+		pwr_ctrl = ADCX140_PWR_CFG_ADC_PDZ | ADCX140_PWR_CFG_PLL_PDZ;
+
+	if (adcx140->micbias_vg && power_state)
+		pwr_ctrl |= ADCX140_PWR_CFG_BIAS_PDZ;
+
+	regmap_update_bits(adcx140->regmap, ADCX140_PWR_CFG,
+			   ADCX140_PWR_CTRL_MSK, pwr_ctrl);
+}
+
 static int adcx140_hw_params(struct snd_pcm_substream *substream,
 			     struct snd_pcm_hw_params *params,
 			     struct snd_soc_dai *dai)
 {
 	struct snd_soc_component *component = dai->component;
+	struct adcx140_priv *adcx140 = snd_soc_component_get_drvdata(component);
 	u8 data = 0;
 
 	switch (params_width(params)) {
@@ -640,9 +655,13 @@ static int adcx140_hw_params(struct snd_pcm_substream *substream,
 		return -EINVAL;
 	}
 
+	adcx140_pwr_ctrl(adcx140, false);
+
 	snd_soc_component_update_bits(component, ADCX140_ASI_CFG0,
 			    ADCX140_WORD_LEN_MSK, data);
 
+	adcx140_pwr_ctrl(adcx140, true);
+
 	return 0;
 }
 
@@ -709,6 +728,8 @@ static int adcx140_set_dai_fmt(struct snd_soc_dai *codec_dai,
 
 	adcx140->dai_fmt = fmt & SND_SOC_DAIFMT_FORMAT_MASK;
 
+	adcx140_pwr_ctrl(adcx140, false);
+
 	snd_soc_component_update_bits(component, ADCX140_ASI_CFG0,
 				      ADCX140_FSYNCINV_BIT |
 				      ADCX140_BCLKINV_BIT |
@@ -721,6 +742,7 @@ static int adcx140_set_dai_fmt(struct snd_soc_dai *codec_dai,
 	snd_soc_component_update_bits(component, ADCX140_ASI_CFG1,
 				      ADCX140_TX_OFFSET_MASK, offset);
 
+	adcx140_pwr_ctrl(adcx140, true);
 
 	return 0;
 }
@@ -818,12 +840,11 @@ static int adcx140_codec_probe(struct snd_soc_component *component)
 
 	ret = device_property_read_u32(adcx140->dev, "ti,mic-bias-source",
 				      &bias_source);
-	if (ret)
+	if (ret || bias_source > ADCX140_MIC_BIAS_VAL_AVDD) {
 		bias_source = ADCX140_MIC_BIAS_VAL_VREF;
-
-	if (bias_source > ADCX140_MIC_BIAS_VAL_AVDD) {
-		dev_err(adcx140->dev, "Mic Bias source value is invalid\n");
-		return -EINVAL;
+		adcx140->micbias_vg = false;
+	} else {
+		adcx140->micbias_vg = true;
 	}
 
 	ret = device_property_read_u32(adcx140->dev, "ti,vref-source",
@@ -906,6 +927,8 @@ static int adcx140_codec_probe(struct snd_soc_component *component)
 				ADCX140_MIC_BIAS_VREF_MSK, bias_cfg);
 	if (ret)
 		dev_err(adcx140->dev, "setting MIC bias failed %d\n", ret);
+
+	adcx140_pwr_ctrl(adcx140, true);
 out:
 	return ret;
 }
@@ -914,21 +937,19 @@ static int adcx140_set_bias_level(struct snd_soc_component *component,
 				  enum snd_soc_bias_level level)
 {
 	struct adcx140_priv *adcx140 = snd_soc_component_get_drvdata(component);
-	int pwr_cfg = 0;
 
 	switch (level) {
 	case SND_SOC_BIAS_ON:
 	case SND_SOC_BIAS_PREPARE:
 	case SND_SOC_BIAS_STANDBY:
-		pwr_cfg = ADCX140_PWR_CFG_BIAS_PDZ | ADCX140_PWR_CFG_PLL_PDZ |
-			  ADCX140_PWR_CFG_ADC_PDZ;
+		adcx140_pwr_ctrl(adcx140, true);
 		break;
 	case SND_SOC_BIAS_OFF:
-		pwr_cfg = 0x0;
+		adcx140_pwr_ctrl(adcx140, false);
 		break;
 	}
 
-	return regmap_write(adcx140->regmap, ADCX140_PWR_CFG, pwr_cfg);
+	return 0;
 }
 
 static const struct snd_soc_component_driver soc_codec_driver_adcx140 = {

sound/soc/codecs/tlv320adcx140.h

@@ -123,6 +123,7 @@
 #define ADCX140_MIC_BIAS_VREF_1375V	2
 #define ADCX140_MIC_BIAS_VREF_MSK GENMASK(1, 0)
 
+#define ADCX140_PWR_CTRL_MSK    GENMASK(7, 5)
 #define ADCX140_PWR_CFG_BIAS_PDZ	BIT(7)
 #define ADCX140_PWR_CFG_ADC_PDZ		BIT(6)
 #define ADCX140_PWR_CFG_PLL_PDZ		BIT(5)
@@ -145,4 +146,5 @@
 #define ADCX140_GPO_CFG_MAX		4
 #define ADCX140_GPO_DRV_MAX		5
 
+
 #endif /* _TLV320ADCX140_ */