Date:   Tue, 26 Nov 2019 14:44:47 +0200
From:   Mathias Nyman <mathias.nyman@...ux.intel.com>
To:     Paul Menzel <pmenzel@...gen.mpg.de>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>
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 26.11.2019 13.33, Paul Menzel wrote:
> Dear Mathias,
> 
> 
> On 2019-11-25 10:20, Mathias Nyman wrote:
>> On 22.11.2019 13.41, Mika Westerberg wrote:
>>> On Fri, Nov 22, 2019 at 12:33:44PM +0100, Paul Menzel wrote:
> 
>>>> 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.
> 
> Nice. Thank you for looking into that. How can these traces be captured?

The Linux tracepoints added to the xhci driver can be enabled by:

mount -t debugfs none /sys/kernel/debug
echo 81920 > /sys/kernel/debug/tracing/buffer_size_kb
echo 1 > /sys/kernel/debug/tracing/events/xhci-hcd/enable
< Trigger the issue >

Copy traces found in /sys/kernel/debug/tracing/trace

Trace file grows fast.

-Mathias

> 
>> 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.
> 
> I always wonder how Microsoft Windows driver do it.
> 
> Mario, should I contact the Dell support regarding this issue?
> 
> 
> Kind regards,
> 
> Paul
> 

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