Date:   Mon, 25 Nov 2019 11:20:19 +0200
From:   Mathias Nyman <mathias.nyman@...ux.intel.com>
To:     Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Paul Menzel <pmenzel@...gen.mpg.de>
Cc:     Mario Limonciello <mario.limonciello@...l.com>,
        Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Yehezkel Bernat <YehezkelShB@...il.com>,
        Christian Kellner <ck@...om.net>, linux-kernel@...r.kernel.org,
        Anthony Wong <anthony.wong@...onical.com>
Subject: Re: USB devices on Dell TB16 dock stop working after resuming

On 22.11.2019 13.41, Mika Westerberg wrote:
> On Fri, Nov 22, 2019 at 12:33:44PM +0100, Paul Menzel wrote:
>> Dear Mika,
>>
>>
>> On 2019-11-22 12:29, Mika Westerberg wrote:
>>> On Fri, Nov 22, 2019 at 12:05:13PM +0100, Paul Menzel wrote:
>>
>>>> On 2019-11-22 11:50, Mika Westerberg wrote:
>>>>> On Wed, Nov 20, 2019 at 12:50:53PM +0200, Mika Westerberg wrote:
>>>>>> On Tue, Nov 19, 2019 at 05:55:43PM +0100, Paul Menzel wrote:
>>>>
>>>>>>> On 2019-11-04 17:21, Mika Westerberg wrote:
>>>>>>>> On Mon, Nov 04, 2019 at 05:11:10PM +0100, Paul Menzel wrote:
>>>>>>>
>>>>>>>>> On 2019-11-04 16:49, Mario.Limonciello@...l.com wrote:
>>>>>>>>>
>>>>>>>>>>> From: Mika Westerberg <mika.westerberg@...ux.intel.com>
>>>>>>>>>>> Sent: Monday, November 4, 2019 9:45 AM
>>>>>>>>>
>>>>>>>>>>> On Mon, Nov 04, 2019 at 04:44:40PM +0200, Mika Westerberg wrote:
>>>>>>>>>>>> On Mon, Nov 04, 2019 at 04:25:03PM +0200, Mika Westerberg wrote:
>>>>>>>>>
>>>>>>>>>>>>> On Mon, Nov 04, 2019 at 02:13:13PM +0100, Paul Menzel wrote:
>>>>>>>>>
>>>>>>>>>>>>>> On the Dell XPS 13 9380 with Debian Sid/unstable with Linux 5.3.7
>>>>>>>>>>>>>> suspending the system, and resuming with Dell’s Thunderbolt TB16
>>>>>>>>>>>>>> dock connected, the USB input devices, keyboard and mouse,
>>>>>>>>>>>>>> connected to the TB16 stop working. They work for a few seconds
>>>>>>>>>>>>>> (mouse cursor can be moved), but then stop working. The laptop
>>>>>>>>>>>>>> keyboard and touchpad still works fine. All firmware is up-to-date
>>>>>>>>>>>>>> according to `fwupdmgr`.
>>>>>>>>>>>>>
>>>>>>>>>>>>> What are the exact steps to reproduce? Just "echo mem >
>>>>>>>>>>>>> /sys/power/state" and then resume by pressing power button?
>>>>>>>>>
>>>>>>>>> GNOME Shell 3.34.1+git20191024-1 is used, and the user just closes the
>>>>>>>>> display. So more than `echo mem > /sys/power/state` is done. What
>>>>>>>>> distribution do you use?
>>>>>>>>
>>>>>>>> I have buildroot based "distro" so there is no UI running.
>>>>>>>
>>>>>>> Hmm, this is quite different from the “normal” use-case of the these devices.
>>>>>>> That way you won’t hit the bugs of the normal users. ;-)
>>>>>>
>>>>>> Well, I can install some distro to that thing also :) I suppose Debian
>>>>>> 10.2 does have this issue, no?
>>>>>>
>>>>>>>>>>>> I tried v5.4-rc6 on my 9380 with TB16 dock connected and did a couple of
>>>>>>>>>>>> suspend/resume cycles (to s2idle) but I don't see any issues.
>>>>>>>>>>>>
>>>>>>>>>>>> I may have older/different firmware than you, though.
>>>>>>>>>>>
>>>>>>>>>>> Upgraded BIOS to 1.8.0 and TBT NVM to v44 but still can't reproduce this
>>>>>>>>>>> on my system :/
>>>>>>>>>
>>>>>>>>> The user reported the issue with the previous firmwares 1.x and TBT NVM v40.
>>>>>>>>> Updating to the recent version (I got the logs with) did not fix the issue.
>>>>>>>>
>>>>>>>> I also tried v40 (that was originally on that system) but I was not able
>>>>>>>> to reproduce it.
>>>>>>>>
>>>>>>>> Do you know if the user changed any BIOS settings?
>>>>>>>
>>>>>>> We had to disable the Thunderbolt security settings as otherwise the USB
>>>>>>> devices wouldn’t work at cold boot either.
>>>>>>
>>>>>> That does not sound right at all. There is the preboot ACL that allows
>>>>>> you to use TBT dock aready on boot. Bolt takes care of this.
>>>>>>
>>>>>> Are you talking about USB devices connected to the TB16 dock?
>>>>>>
>>>>>> Also are you connecting the TB16 dock to the Thunderbolt ports (left
>>>>>> side of the system marked with small lightning logo) or to the normal
>>>>>> Type-C ports (right side)?
>>>>>>
>>>>>>> So, I built Linux 5.4-rc8 (`make bindeb-pkg -j8`), but unfortunately the
>>>>>>> error is still there. Sometimes, re-plugging the dock helped, and sometimes
>>>>>>> it did not.
>>>>>>>
>>>>>>> Please find the logs attached. The strange thing is, the Linux kernel detects
>>>>>>> the devices and I do not see any disconnect events. But, `lsusb` does not list
>>>>>>> the keyboard and the mouse. Is that expected.
>>>>>>
>>>>>> I'm bit confused. Can you describe the exact steps what you do (so I can
>>>>>> replicate them).
>>>>>
>>>>> I managed to reproduce following scenario.
>>>>>
>>>>> 1. Boot the system up to UI
>>>>> 2. Connect TB16 dock (and see that it gets authorized by bolt)
>>>>> 3. Connect keyboard and mouse to the TB16 dock
>>>>> 4. Both mouse and keyboard are functional
>>>>> 5. Enter s2idle by closing laptop lid
>>>>> 6. Exit s2idle by opening the laptop lid
>>>>> 7. After ~10 seconds or so the mouse or keyboard or both do not work
>>>>>     anymore. They do not respond but they are still "present".
>>>>>
>>>>> The above does not happen always but from time to time.
>>>>>
>>>>> Is this the scenario you see as well?
>>>>
>>>> Yes, it is. Though I’d say it’s only five seconds or so.
>>>>
>>>>> This is on Ubuntu 19.10 with the 5.3 stock kernel.
>>>>
>>>> “stock” in upstream’s or Ubuntu’s?
>>>
>>> It is Ubuntu's.
>>>
>>>>> I can get them work again by unplugging them and plugging back (leaving
>>>>> the TBT16 dock connected). Also if you run lspci when the problem
>>>>> occurs it still shows the dock so PCIe link stays up.
>>>>
>>>> Re-connecting the USB devices does not help here, but I still suspect it’s
>>>> the same issue.
>>>
>>> Yeah, sounds like so. Did you try to connect the device (mouse,
>>> keyboard) to another USB port?
>>
>> I do not think I did, but I can’t remember. Next week would be the next chance
>> to test this.
>>
>>>> Yesterday, I had my hand on a Dell XPS 13 7390 (10th Intel generation) and
>>>> tried it with the shipped Ubuntu 18.04 LTS. There, the problem was not
>>>> always reproducible, but it still happened. Sometimes, only one of the USB
>>>> device (either keyboard or mouse) stopped working.
>>>
>>> I suppose this is also with the TB16 dock connected, correct?
>>
>> Correct.
>>
>> Can I ask again, how the USB devices connected to the dock can be listed on
>> the command line? lsusb needs to be adapted for that or is a different
>> mechanism needed?
> 
> The TB16 dock has ASMEDIA xHCI controller, which is PCIe device so you
> can see it by running lsusb and looking at the devices under that
> controller. I think maybe 'lsusb -t' is helpful.
> 
> The xHCI controller itself you can see by running lspci.
> 

I got traces from the ASMedia xHC controller in the TB16 dock.
There are issues with split transactions between the ASMedia host and the 7 port
High speed hub built in to the dock.

host reports a split transaction error for mouse or keyboard full-speed/low-speed
interrupt transactions. Endpoint doesn't recover after resetting it.

Split transaction allows full- and low-speed devices to be attached to high-speed
hubs, and are used only between the host and the HS hub. A transaction translator (TT)
in the HS hub will translate the high-speed split transactions on its upstream port to
low/full speed transactions on the downstream port.

I'll see if there are any xHC parameters driver is setting that trigger these
split transaction errors to trigger more easy.

-Mathias

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