mt76: mt7915: fix eeprom DBDC band selection

When the EEPROM band fields contain default values, assign 2.4 GHz to the
first band and 5 GHz to the second.
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7915/eeprom.c

@@ -54,11 +54,14 @@ void mt7915_eeprom_parse_band_config(struct mt7915_phy *phy)
 
 	val = mt7915_eeprom_read(dev, MT_EE_WIFI_CONF + ext_phy);
 	val = FIELD_GET(MT_EE_WIFI_CONF0_BAND_SEL, val);
+	if (val == MT_EE_BAND_SEL_DEFAULT && dev->dbdc_support)
+		val = ext_phy ? MT_EE_BAND_SEL_5GHZ : MT_EE_BAND_SEL_2GHZ;
+
 	switch (val) {
-	case MT_EE_5GHZ:
+	case MT_EE_BAND_SEL_5GHZ:
 		phy->mt76->cap.has_5ghz = true;
 		break;
-	case MT_EE_2GHZ:
+	case MT_EE_BAND_SEL_2GHZ:
 		phy->mt76->cap.has_2ghz = true;
 		break;
 	default:

drivers/net/wireless/mediatek/mt76/mt7915/eeprom.h

@@ -35,10 +35,10 @@ enum mt7915_eeprom_field {
 #define MT_EE_WIFI_CONF7_TSSI1_5G		BIT(4)
 
 enum mt7915_eeprom_band {
-	MT_EE_DUAL_BAND,
-	MT_EE_5GHZ,
-	MT_EE_2GHZ,
-	MT_EE_DBDC,
+	MT_EE_BAND_SEL_DEFAULT,
+	MT_EE_BAND_SEL_5GHZ,
+	MT_EE_BAND_SEL_2GHZ,
+	MT_EE_BAND_SEL_DUAL,
 };
 
 #define SKU_DELTA_VAL		GENMASK(5, 0)