net: phy: bcm7xxx: update workaround to fix 100BaseT corner cases

Update the AFE_TX_CONFIG value to solve marginal rise/fall issues
observed when the link is operating in 100BaseT. This workaround applies
to GPHY revisions D0, E0 and newer.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/phy/bcm7xxx.c b/drivers/net/phy/bcm7xxx.c
index b5dc59de094eef06838d4601cacd9dbeaba04a6a..4dea85bfc545b86d5874031531a9ce4963facbe2 100644 (file)
--- a/drivers/net/phy/bcm7xxx.c
+++ b/drivers/net/phy/bcm7xxx.c
@@ -136,8 +136,8 @@ static int bcm7xxx_28nm_d0_afe_config_init(struct phy_device *phydev)
        /* AFE_RX_LP_COUNTER, set RX bandwidth to maximum */
        phy_write_misc(phydev, AFE_RX_LP_COUNTER, 0x7fc0);
 
-       /* AFE_TX_CONFIG, set 1000BT Cfeed=110 for all ports */
-       phy_write_misc(phydev, AFE_TX_CONFIG, 0x0061);
+       /* AFE_TX_CONFIG, set 100BT Cfeed=011 to improve rise/fall time */
+       phy_write_misc(phydev, AFE_TX_CONFIG, 0x431);
 
        /* AFE_VDCA_ICTRL_0, set Iq=1101 instead of 0111 for AB symmetry */
        phy_write_misc(phydev, AFE_VDCA_ICTRL_0, 0xa7da);
@@ -167,6 +167,9 @@ static int bcm7xxx_28nm_e0_plus_afe_config_init(struct phy_device *phydev)
        /* AFE_RXCONFIG_1, provide more margin for INL/DNL measurement */
        phy_write_misc(phydev, AFE_RXCONFIG_1, 0x9b2f);
 
+       /* AFE_TX_CONFIG, set 100BT Cfeed=011 to improve rise/fall time */
+       phy_write_misc(phydev, AFE_TX_CONFIG, 0x431);
+
        /* AFE_VDCA_ICTRL_0, set Iq=1101 instead of 0111 for AB symmetry */
        phy_write_misc(phydev, AFE_VDCA_ICTRL_0, 0xa7da);