[PATCH 1/1][H/OEM-5.13/OEM-5.14/U] UBUNTU: SAUCE: igc: wait for the MAC copy when enabled MAC passthrough

[Aaron Ma]

BugLink: https://bugs.launchpad.net/bugs/1942999

Such as dock hot plug event when runtime, for hardware implementation,
the MAC copy takes less than one second when BIOS enabled MAC passthrough.
After test on Lenovo TBT4 dock, 600ms is enough to update the
MAC address.
Otherwise ethernet fails to work.

Link: https://lore.kernel.org/lkml/20210702045120.22855-2-aaron.ma@canonical.com/
Signed-off-by: Aaron Ma <aaron.ma at canonical.com>
---
 drivers/net/ethernet/intel/igc/igc_main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index 51be5b9b07bd..512739f20cad 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -5088,6 +5088,9 @@ static int igc_probe(struct pci_dev *pdev,
 	memcpy(&hw->mac.ops, ei->mac_ops, sizeof(hw->mac.ops));
 	memcpy(&hw->phy.ops, ei->phy_ops, sizeof(hw->phy.ops));
 
+	if (pci_is_thunderbolt_attached(pdev))
+		msleep(600);
+
 	/* Initialize skew-specific constants */
 	err = ei->get_invariants(hw);
 	if (err)
-- 
2.30.2