ixgbe: add link check for X550 copper
This patch adds ixgbe_check_link_t_X550em for checking copper PHY link. We check that both the MAC and external PHY have link. This is to avoid a false link up between the internal and external PHY when the external PHY doesn't have link. Signed-off-by: NDon Skidmore <donald.c.skidmore@intel.com> Tested-by: NKrishneil Singh <krishneil.k.singh@intel.com> Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
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