net: pcs: xpcs: fix C73 AN not getting enabled

[ Upstream commit c46e78ba9a7a09da4f192dc8df15c4e8a07fb9e0 ]

The XPCS expects clause 73 (copper backplane) autoneg to follow the
ethtool autoneg bit. It actually did that until the blamed
commit inaptly replaced state->an_enabled (coming from ethtool) with
phylink_autoneg_inband() (coming from the device tree or struct
phylink_config), as part of an unrelated phylink_pcs API conversion.

Russell King suggests that state->an_enabled from the original code was
just a proxy for the ethtool Autoneg bit, and that the correct way of
restoring the functionality is to check for this bit in the advertising
mask.

Fixes: bef9c4bcc22b ("net: pcs: xpcs: convert to phylink_pcs_ops")
Link: https://lore.kernel.org/netdev/ZGNt2MFeRolKGFck@shell.armlinux.org.uk/
Suggested-by: Russell King (Oracle) <linux@armlinux.org.uk>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c
index dd88624593c71d3006cc61b85683013a377d5d35..3f882bce37f42289d99746d87d0f71d0c1391337 100644 (file)
--- a/drivers/net/pcs/pcs-xpcs.c
+++ b/drivers/net/pcs/pcs-xpcs.c
@@ -881,7 +881,7 @@ int xpcs_do_config(struct dw_xpcs *xpcs, phy_interface_t interface,
 
        switch (compat->an_mode) {
        case DW_AN_C73:
-               if (phylink_autoneg_inband(mode)) {
+               if (test_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, advertising)) {
                        ret = xpcs_config_aneg_c73(xpcs, compat);
                        if (ret)
                                return ret;