The tlv320aic31xx devices allow to adjust the output common-mode voltage
for best analog performance. The datasheet states that the common mode
voltage should be set to be <= AVDD/2.
This changes allows to configure the output common-mode voltage via a DT
property. If the property is absent the voltage is automatically chosen
as the highest voltage below/equal to AVDD/2.
Signed-off-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
---
.../bindings/sound/tlv320aic31xx.txt | 5 +++
sound/soc/codecs/tlv320aic31xx.c | 45 +++++++++++++++++++
sound/soc/codecs/tlv320aic31xx.h | 8 ++++
3 files changed, 58 insertions(+)
diff --git a/Documentation/devicetree/bindings/sound/tlv320aic31xx.txt b/Documentation/devicetree/bindings/sound/tlv320aic31xx.txt
index 5b3c33bb99e5..e372303697dc 100644
--- a/Documentation/devicetree/bindings/sound/tlv320aic31xx.txt
+++ b/Documentation/devicetree/bindings/sound/tlv320aic31xx.txt
@@ -29,6 +29,11 @@ Optional properties:
3 or MICBIAS_AVDD - MICBIAS output is connected to AVDD
If this node is not mentioned or if the value is unknown, then
micbias is set to 2.0V.
+- ai31xx-ocmv - output common-mode voltage setting
+ 0 - 1.35V,
+ 1 - 1.5V,
+ 2 - 1.65V,
+ 3 - 1.8V
Deprecated properties:
diff --git a/sound/soc/codecs/tlv320aic31xx.c b/sound/soc/codecs/tlv320aic31xx.c
index df627a08def9..f6f19fdc72f5 100644
--- a/sound/soc/codecs/tlv320aic31xx.c
+++ b/sound/soc/codecs/tlv320aic31xx.c
@@ -171,6 +171,7 @@ struct aic31xx_priv {
int rate_div_line;
bool master_dapm_route_applied;
int irq;
+ u8 ocmv; /* output common-mode voltage */
};
struct aic31xx_rate_divs {
@@ -1312,6 +1313,11 @@ static int aic31xx_codec_probe(struct snd_soc_component *component)
if (ret)
return ret;
+ /* set output common-mode voltage */
+ snd_soc_component_update_bits(component, AIC31XX_HPDRIVER,
+ AIC31XX_HPD_OCMV_MASK,
+ aic31xx->ocmv << AIC31XX_HPD_OCMV_SHIFT);
+
return 0;
}
@@ -1501,6 +1507,43 @@ static irqreturn_t aic31xx_irq(int irq, void *data)
return IRQ_NONE;
}
+static void aic31xx_configure_ocmv(struct aic31xx_priv *priv)
+{
+ struct device *dev = priv->dev;
+ int dvdd, avdd;
+ u32 value;
+
+ if (dev->fwnode &&
+ fwnode_property_read_u32(dev->fwnode, "ai31xx-ocmv", &value)) {
+ /* OCMV setting is forced by DT */
+ if (value <= 3) {
+ priv->ocmv = value;
+ return;
+ }
+ }
+
+ avdd = regulator_get_voltage(priv->supplies[3].consumer);
+ dvdd = regulator_get_voltage(priv->supplies[5].consumer);
+
+ if (avdd > 3600000 || dvdd > 1950000) {
+ dev_warn(dev,
+ "Too high supply voltage(s) AVDD: %d, DVDD: %d\n",
+ avdd, dvdd);
+ } else if (avdd == 3600000 && dvdd == 1950000) {
+ priv->ocmv = AIC31XX_HPD_OCMV_1_8V;
+ } else if (avdd >= 3300000 && dvdd >= 1800000) {
+ priv->ocmv = AIC31XX_HPD_OCMV_1_65V;
+ } else if (avdd >= 3000000 && dvdd >= 1650000) {
+ priv->ocmv = AIC31XX_HPD_OCMV_1_5V;
+ } else if (avdd >= 2700000 && dvdd >= 1525000) {
+ priv->ocmv = AIC31XX_HPD_OCMV_1_35V;
+ } else {
+ dev_warn(dev,
+ "Invalid supply voltage(s) AVDD: %d, DVDD: %d\n",
+ avdd, dvdd);
+ }
+}
+
static int aic31xx_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
@@ -1570,6 +1613,8 @@ static int aic31xx_i2c_probe(struct i2c_client *i2c,
return ret;
}
+ aic31xx_configure_ocmv(aic31xx);
+
if (aic31xx->irq > 0) {
regmap_update_bits(aic31xx->regmap, AIC31XX_GPIO1,
AIC31XX_GPIO1_FUNC_MASK,
diff --git a/sound/soc/codecs/tlv320aic31xx.h b/sound/soc/codecs/tlv320aic31xx.h
index cb024955c978..83a8c7604cc3 100644
--- a/sound/soc/codecs/tlv320aic31xx.h
+++ b/sound/soc/codecs/tlv320aic31xx.h
@@ -232,6 +232,14 @@ struct aic31xx_pdata {
#define AIC31XX_HSD_HP 0x01
#define AIC31XX_HSD_HS 0x03
+/* AIC31XX_HPDRIVER */
+#define AIC31XX_HPD_OCMV_MASK GENMASK(4, 3)
+#define AIC31XX_HPD_OCMV_SHIFT 3
+#define AIC31XX_HPD_OCMV_1_35V 0x0
+#define AIC31XX_HPD_OCMV_1_5V 0x1
+#define AIC31XX_HPD_OCMV_1_65V 0x2
+#define AIC31XX_HPD_OCMV_1_8V 0x3
+
/* AIC31XX_MICBIAS */
#define AIC31XX_MICBIAS_MASK GENMASK(1, 0)
#define AIC31XX_MICBIAS_SHIFT 0
--
2.20.1
