--- a/drivers/net/phy/realtek.c
+++ b/drivers/net/phy/realtek.c
@@ -676,6 +676,25 @@ static int rtl822x_config_aneg(struct ph
 	return __genphy_config_aneg(phydev, ret);
 }
 
+static void rtl822x_update_interface(struct phy_device *phydev)
+{
+	/* Automatically switch SERDES interface between
+	 * SGMII and 2500-BaseX according to speed.
+	 */
+	switch (phydev->speed) {
+	case SPEED_2500:
+		phydev->interface = PHY_INTERFACE_MODE_2500BASEX;
+		break;
+	case SPEED_1000:
+	case SPEED_100:
+	case SPEED_10:
+		phydev->interface = PHY_INTERFACE_MODE_SGMII;
+		break;
+	default:
+		break;
+	}
+}
+
 static int rtl822x_read_status(struct phy_device *phydev)
 {
 	int ret;
@@ -694,11 +713,14 @@ static int rtl822x_read_status(struct ph
 			phydev->lp_advertising, lpadv & RTL_LPADV_2500FULL);
 	}
 
-	ret = genphy_read_status(phydev);
+	ret = rtlgen_read_status(phydev);
 	if (ret < 0)
 		return ret;
 
-	return rtlgen_get_speed(phydev);
+	if (phydev->is_c45 && phydev->link)
+		rtl822x_update_interface(phydev);
+
+	return 0;
 }
 
 static bool rtlgen_supports_2_5gbps(struct phy_device *phydev)