net: phy: marvell: Errata for mv88e6390 internal PHYs

The VOD can be out of spec, unless some magic value is poked into an
undocumented register in an undocumented page.

Fixes: fdacd1dd8a36 ("net: phy: Marvell: Add mv88e6390 internal PHY")
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/phy/marvell.c b/drivers/net/phy/marvell.c
index a9c7c7f41b0cdd3b058c6e805dfe4d063ad9b58d..0d6b58d1cdc053b8804c63354582ce7e556214b5 100644 (file)
--- a/drivers/net/phy/marvell.c
+++ b/drivers/net/phy/marvell.c
@@ -1046,6 +1046,39 @@ static int m88e1145_config_init(struct phy_device *phydev)
        return 0;
 }
 
+/* The VOD can be out of specification on link up. Poke an
+ * undocumented register, in an undocumented page, with a magic value
+ * to fix this.
+ */
+static int m88e6390_errata(struct phy_device *phydev)
+{
+       int err;
+
+       err = phy_write(phydev, MII_BMCR,
+                       BMCR_ANENABLE | BMCR_SPEED1000 | BMCR_FULLDPLX);
+       if (err)
+               return err;
+
+       usleep_range(300, 400);
+
+       err = phy_write_paged(phydev, 0xf8, 0x08, 0x36);
+       if (err)
+               return err;
+
+       return genphy_soft_reset(phydev);
+}
+
+static int m88e6390_config_aneg(struct phy_device *phydev)
+{
+       int err;
+
+       err = m88e6390_errata(phydev);
+       if (err)
+               return err;
+
+       return m88e1510_config_aneg(phydev);
+}
+
 /**
  * fiber_lpa_mod_linkmode_lpa_t
  * @advertising: the linkmode advertisement settings
@@ -2283,7 +2316,7 @@ static struct phy_driver marvell_drivers[] = {
                .features = PHY_GBIT_FEATURES,
                .probe = m88e6390_probe,
                .config_init = &marvell_config_init,
-               .config_aneg = &m88e1510_config_aneg,
+               .config_aneg = &m88e6390_config_aneg,
                .read_status = &marvell_read_status,
                .ack_interrupt = &marvell_ack_interrupt,
                .config_intr = &marvell_config_intr,