[J/OEM-5.17/U][PATCH 1/1] UBUNTU: SAUCE: igc: wait for the MAC copy when enabled MAC passthrough

Aaron Ma aaron.ma at canonical.com
Wed Aug 3 07:55:53 UTC 2022

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 f99819fc559d9..634cfdc203203 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -6323,6 +6323,9 @@ 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)

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