linux-kernel - Re: Question about commit 8cf9926c537c (thunderbolt: Reset only non-USB4 host routers in resume)

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Message-ID: <d7873de1-db30-4754-a226-b4ead0196c2d@kylinos.cn>
Date: Tue, 30 Dec 2025 15:43:08 +0800
From: Jayi Li <lijiayi@...inos.cn>
To: Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc: linux-kernel@...r.kernel.org
Subject: Re: Question about commit 8cf9926c537c (thunderbolt: Reset only
 non-USB4 host routers in resume)


在 2025/12/30 15:24, Mika Westerberg 写道:
> Hi,
>
> On Thu, Dec 25, 2025 at 03:22:29PM +0800, Jayi Li wrote:
>> Hi Mika,
>>
>> Sorry to bother. I have a question about the above commit that I couldn't
>> figure out, and I'd really appreciate it if you could help.
>>
>> The commit message says: "There is no need to reset the USB4 host routers on
>> resume because they are reset already."But aside from `nhi_probe`,
>>
>> I haven't found where this reset occurs in the resume path. Could you please
>> clarify where this automatic reset happens or the rationale behind it?
> It's done when the router enters Sleep state so there is no need to do
> reset on the SW side.

I see, so the firmware performs a reset when entering sleep. Thank you 
for your reply.