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@pengutronix.de --- .../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