linux-kernel - Re: [Patch v2 2/2] thunderbolt: Teardown tunnels and reset downstream ports created by boot firmware

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Date: Wed, 10 Jan 2024 16:32:03 +0200
From: Mika Westerberg <mika.westerberg@...ux.intel.com>
To: Sanath S <sanaths2@....com>
Cc: Sanath S <Sanath.S@....com>, mario.limonciello@....com,
	andreas.noever@...il.com, michael.jamet@...el.com,
	YehezkelShB@...il.com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [Patch v2 2/2] thunderbolt: Teardown tunnels and reset
 downstream ports created by boot firmware

On Mon, Jan 08, 2024 at 10:26:13AM +0530, Sanath S wrote:
> 
> On 1/5/2024 12:38 PM, Mika Westerberg wrote:
> > On Thu, Jan 04, 2024 at 07:20:05PM +0530, Sanath S wrote:
> > > On 1/3/2024 10:47 PM, Mika Westerberg wrote:
> > > > On Wed, Jan 03, 2024 at 07:45:56PM +0530, Sanath S wrote:
> > > > > On 12/21/2023 3:23 PM, Mika Westerberg wrote:
> > > > > > On Thu, Dec 21, 2023 at 03:01:50PM +0530, Sanath S wrote:
> > > > > > > > Sure. I'll check with these combinations.
> > > > > > > Can you name any docks that meets these requirements ? I'll try to get
> > > > > > > hold of it here and check.
> > > > > > Pretty much every Titan Ridge based dock. For instance Dell WD19TB.
> > > > > > 
> > > > > > I have some hardware here that I can use to try it out too.
> > > > > It seems that issue is seen on Dell WD19TB too. So this fix may have to
> > > > > extended to TBT3 as well ?
> > > > Hm, what issue? I thought this works accross all the supported devices
> > > > due to the DFP, no?
> > > > 
> > > > > I'll give it a try this week and share the observation.
> > > Got my hands on Dell WD19TB. And it works!
> > > 
> > > Here is lspci -t output with and without fix
> > > 
> > > without fix:
> > >             +-03.1-[04-62]----00.0-[05-07]--+-02.0-[06]----00.0
> > >             |                               \-04.0-[07]--
> > > With fix:
> > >             +-03.1-[04-62]----00.0-[05-62]--+-02.0-[06]----00.0
> > >             |                               \-04.0-[07-62]--
> > > 
> > > I'll send out v3 with with splitting into 2/3 patches(Will see how it looks
> > > good).
> > Okay and you checked also that with the WD19TB (and its integrated xHCI)
> > there are no additional boot delays because of the reset?
> I did not observe any delays. As now we are not doing any discover as well
> before resetting.

Okay thanks!