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6e0022b5ae
aqr_gen1_read_status() decodes the MDIO_PHYXS_VEND_IF_STATUS register
to determine which SerDes interface the PHY is currently using on its
system side and stores the result in phydev->interface. phylink relies
on this value to configure the MAC.
The autoneg == AUTONEG_DISABLE check is not correct:
MDIO_PHYXS_VEND_IF_STATUS is set by the PHY firmware based on the
negotiated link speed, not based on whether autoneg was used to reach
it. When the link comes up at 1G in forced mode, the register correctly
reads SGMII, but the early return prevents phydev->interface from being
updated. It stays at whatever value it held before (typically 2500BASE-X
from the initial autoneg run), so phylink configures the MAC for the
wrong interface and the link cannot come up.
Remove the autoneg guard so that the system interface type is always
decoded when the link is up.
Cc: stable@vger.kernel.org
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