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Both PCS/PMA PHY and the external PHY need to have a valid link status in order to have Ethernet traffic. Check and wait this status at setup_phy() so that we could diagnose if there is a PHY issue. Signed-off-by: Andy Chiu <andy.chiu@sifive.com> Reviewed-by: Greentime Hu <greentime.hu@sifive.com> Link: https://lore.kernel.org/r/20221101035800.912644-3-andy.chiu@sifive.com Signed-off-by: Michal Simek <michal.simek@amd.com>