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

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Message-ID: <20251230072411.GC2275908@black.igk.intel.com>
Date: Tue, 30 Dec 2025 08:24:11 +0100
From: Mika Westerberg <mika.westerberg@...ux.intel.com>
To: Jayi Li <lijiayi@...inos.cn>
Cc: linux-kernel@...r.kernel.org
Subject: Re: Question about commit 8cf9926c537c (thunderbolt: Reset only
 non-USB4 host routers in resume)

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.