Reset the bit 12 in PHY's LRE Control register upon initialization.
According to the datasheet, this bit must be written to zero after
every device reset.
Fixes: 03ab6c244bb0 ("net: phy: bcm-phy-lib: Implement BroadR-Reach link modes")
Signed-off-by: Kamil Horák - 2N <kamilh@xxxxxxxx>
Reviewed-by: Florian Fainelli <florian.fainelli@xxxxxxxxxxxx>
---
drivers/net/phy/broadcom.c | 25 +++++++++++++++++++++----
1 file changed, 21 insertions(+), 4 deletions(-)
diff --git a/drivers/net/phy/broadcom.c b/drivers/net/phy/broadcom.c
index 8547983bd72f..a60e58ef90c4 100644
--- a/drivers/net/phy/broadcom.c
+++ b/drivers/net/phy/broadcom.c
@@ -667,7 +667,7 @@ static int bcm5481x_read_abilities(struct phy_device *phydev)
{
struct device_node *np = phydev->mdio.dev.of_node;
struct bcm54xx_phy_priv *priv = phydev->priv;
- int i, val, err;
+ int i, val, err, aneg;
for (i = 0; i < ARRAY_SIZE(bcm54811_linkmodes); i++)
linkmode_clear_bit(bcm54811_linkmodes[i], phydev->supported);
@@ -688,9 +688,19 @@ static int bcm5481x_read_abilities(struct phy_device *phydev)
if (val < 0)
return val;
+ /* BCM54811 is not capable of LDS but the corresponding bit
+ * in LRESR is set to 1 and marked "Ignore" in the datasheet.
+ * So we must read the bcm54811 as unable to auto-negotiate
+ * in BroadR-Reach mode.
+ */
+ if (BRCM_PHY_MODEL(phydev) == PHY_ID_BCM54811)
+ aneg = 0;
+ else
+ aneg = val & LRESR_LDSABILITY;
+
linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
phydev->supported,
- val & LRESR_LDSABILITY);
+ aneg);
linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT1_Full_BIT,
phydev->supported,
val & LRESR_100_1PAIR);
@@ -747,8 +757,15 @@ static int bcm54811_config_aneg(struct phy_device *phydev)
/* Aneg firstly. */
if (priv->brr_mode) {
- /* BCM54811 is only capable of autonegotiation in IEEE mode */
- phydev->autoneg = 0;
+ /* BCM54811 is only capable of autonegotiation in IEEE mode.
+ * In BroadR-Reach mode, disable the Long Distance Signaling,
+ * the BRR mode autoneg as supported in other Broadcom PHYs.
+ * This bit is marked as "Reserved" and "Default 1, must be
+ * written to 0 after every device reset" in the datasheet.
+ */
+ ret = phy_modify(phydev, MII_BCM54XX_LRECR, LRECR_LDSEN, 0);
+ if (ret < 0)
+ return ret;
ret = bcm_config_lre_aneg(phydev, false);
} else {
ret = genphy_config_aneg(phydev);
--
2.39.5
