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

Browse source

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>

...

This commit is contained in:

Basavaraj Natikar 2026-08-06 18:29:29 +05:30 • committed by Mika Westerberg

parent e120d14d03

commit f1de1fc5f6

5 changed files with 97 additions and 3 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

26

drivers/thunderbolt/domain.c

View file

26

drivers/thunderbolt/nhi.c

View file

21

drivers/thunderbolt/nhi.h

View file

4

drivers/thunderbolt/nhi_regs.h

View file

23

drivers/thunderbolt/pci.c

View file