From: Justin Chen justin.chen@broadcom.com
commit 096516d092d54604d590827d05b1022c8f326639 upstream
The 54810 does not support c45. The mmd_phy_indirect accesses return arbirtary values leading to odd behavior like saying it supports EEE when it doesn't. We also see that reading/writing these non-existent MMD registers leads to phy instability in some cases.
Fixes: b14995ac2527 ("net: phy: broadcom: Add BCM54810 PHY entry") Signed-off-by: Justin Chen justin.chen@broadcom.com Reviewed-by: Florian Fainelli florian.fainelli@broadcom.com Link: https://lore.kernel.org/r/1691901708-28650-1-git-send-email-justin.chen@broa... Signed-off-by: Jakub Kicinski kuba@kernel.org [florian: resolved conflicts in 4.14] Signed-off-by: Florian Fainelli florian.fainelli@broadcom.com --- drivers/net/phy/broadcom.c | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/drivers/net/phy/broadcom.c b/drivers/net/phy/broadcom.c index 97e017a54eb5..2fbb1277b3a8 100644 --- a/drivers/net/phy/broadcom.c +++ b/drivers/net/phy/broadcom.c @@ -403,6 +403,17 @@ static int bcm5482_read_status(struct phy_device *phydev) return err; }
+static int bcm54810_read_mmd(struct phy_device *phydev, int devnum, u16 regnum) +{ + return -EOPNOTSUPP; +} + +static int bcm54810_write_mmd(struct phy_device *phydev, int devnum, u16 regnum, + u16 val) +{ + return -EOPNOTSUPP; +} + static int bcm5481_config_aneg(struct phy_device *phydev) { struct device_node *np = phydev->mdio.dev.of_node; @@ -650,6 +661,8 @@ static struct phy_driver broadcom_drivers[] = { .name = "Broadcom BCM54810", .features = PHY_GBIT_FEATURES, .flags = PHY_HAS_INTERRUPT, + .read_mmd = bcm54810_read_mmd, + .write_mmd = bcm54810_write_mmd, .config_init = bcm54xx_config_init, .config_aneg = bcm5481_config_aneg, .read_status = genphy_read_status,