r8169: fix wrong PHY ID issue with RTL8168dp

[ Upstream commit 62bdc8f ] As reported in [0] at least one RTL8168dp version has problems establishing a link. This chip version has an integrated RTL8211b PHY, however the chip seems to report a wrong PHY ID, resulting in a wrong PHY driver (for Generic Realtek PHY) being loaded. Work around this issue by adding a hook to r8168dp_2_mdio_read() for returning the correct PHY ID. [0] https://bbs.archlinux.org/viewtopic.php?id=246508 Fixes: 242cd9b ("r8169: use phy_resume/phy_suspend") Signed-off-by: Heiner Kallweit <[email protected]> Signed-off-by: David S. Miller <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
garsia0 · Nov 10, 2019 · 5eb1967 · 5eb1967
1 parent 9e7c4fa
commit 5eb1967
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
@@ -1010,6 +1010,10 @@ static int r8168dp_2_mdio_read(struct rtl8169_private *tp, int reg)
 {
 	int value;
 
+	/* Work around issue with chip reporting wrong PHY ID */
+	if (reg == MII_PHYSID2)
+		return 0xc912;
+
 	r8168dp_2_mdio_start(tp);
 
 	value = r8169_mdio_read(tp, reg);