Re: [PATCH -next v3] thunderbolt: Add quirk to reset host interface on DMA path teardown for AMD USB4 routers

[Basavaraj Natikar <bnatikar@amd.com>]

On 8/7/2026 11:46 AM, Mika Westerberg wrote:
> Hi,
>
> On Thu, Aug 06, 2026 at 06:29:29PM +0530, Basavaraj Natikar wrote:
>> 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>
> I did few minor cosmetic tweaks and applied to thunderbolt.git/next,

Thanks a lot Mika, appreciate the review and the tweaks!

Thanks,
--
Basavaraj