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

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Date: Mon, 8 Jan 2024 10:26:13 +0530
From: Sanath S <sanaths2@....com>
To: Mika Westerberg <mika.westerberg@...ux.intel.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 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.
It was ready to use as soon as I see login screen.
>> Any other comments, we can take it on v3.
> Sure.
I've sent v3.