diff --git a/target/linux/realtek/files-5.4/drivers/net/dsa/rtl83xx/rtl839x.c b/target/linux/realtek/files-5.4/drivers/net/dsa/rtl83xx/rtl839x.c
index f6d061a5e0..056bc790c2 100644
--- a/target/linux/realtek/files-5.4/drivers/net/dsa/rtl83xx/rtl839x.c
+++ b/target/linux/realtek/files-5.4/drivers/net/dsa/rtl83xx/rtl839x.c
@@ -607,10 +607,14 @@ int rtl8390_sds_power(int mac, int val)
 int rtl839x_read_phy(u32 port, u32 page, u32 reg, u32 *val)
 {
        u32 v;
+       int version = (sw_r32(RTL839X_MODEL_NAME_INFO) & 0x3f) >> 1;

        if (port > 63 || page > 4095 || reg > 31)
                return -ENOTSUPP;

+       if (port > 52 && version <= 2)
+               return -EIO;
+
        mutex_lock(&smi_lock);

        sw_w32_mask(0xffff0000, port << 16, RTL839X_PHYREG_DATA_CTRL);
@@ -729,12 +733,15 @@ int rtl839x_write_mmd_phy(u32 port, u32 devnum, u32 regnum, u32 val)

 void rtl8390_get_version(struct rtl838x_switch_priv *priv)
 {
-       u32 info;
+       u32 info, model;

        sw_w32_mask(0xf << 28, 0xa << 28, RTL839X_CHIP_INFO);
        info = sw_r32(RTL839X_CHIP_INFO);
-       pr_debug("Chip-Info: %x\n", info);
-       priv->version = RTL8390_VERSION_A;
+
+       model = sw_r32(RTL839X_MODEL_NAME_INFO);
+       priv->version = RTL8390_VERSION_A + ((model & 0x3f) >> 1);
+
+       pr_info("RTL839X Chip-Info: %x, version %c\n", info, priv->version);
 }

 void rtl839x_vlan_profile_dump(int profile)
diff --git a/target/linux/realtek/files-5.4/drivers/net/dsa/rtl83xx/rtl83xx.h b/target/linux/realtek/files-5.4/drivers/net/dsa/rtl83xx/rtl83xx.h
index f197e933d6..920d23d1e8 100644
--- a/target/linux/realtek/files-5.4/drivers/net/dsa/rtl83xx/rtl83xx.h
+++ b/target/linux/realtek/files-5.4/drivers/net/dsa/rtl83xx/rtl83xx.h
@@ -9,6 +9,8 @@

 #define RTL8380_VERSION_A 'A'
 #define RTL8390_VERSION_A 'A'
+#define RTL8390_VERSION_B 'B'
+#define RTL8390_VERSION_C 'C'
 #define RTL8380_VERSION_B 'B'

 struct fdb_update_work {