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thunderbolt: Add quirk to reset host interface on DMA path teardown for AMD USB4 routers

Some AMD USB4 host routers have a bug in the Host Interface where
DMA path setup and teardown cycles may cause the Tx ring to hang.

Fix this by issuing a Host Interface Reset on every DMA path teardown
for affected routers. The Host Interface Reset brings the registers in
the memory BAR to their default state and clears the End-to-End Flow
Control state, preventing the hang condition.

Co-developed-by: Sanath S <Sanath.S@amd.com>
Signed-off-by: Sanath S <Sanath.S@amd.com>
Signed-off-by: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
B
Basavaraj Natikar committed
f1de1fc5f632cdeae1f5c2984572ab710d4dfcaa
Parent: e120d14
Committed by Mika Westerberg <mika.westerberg@linux.intel.com> on 8/7/2026, 6:14:26 AM