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Subject: Re: USB devices on Dell TB16 dock stop working after resuming
To:     Mathias Nyman <mathias.nyman@linux.intel.com>,
        Mika Westerberg <mika.westerberg@linux.intel.com>
Cc:     Mario Limonciello <mario.limonciello@dell.com>,
        Andreas Noever <andreas.noever@gmail.com>,
        Michael Jamet <michael.jamet@intel.com>,
        Yehezkel Bernat <YehezkelShB@gmail.com>,
        Christian Kellner <ck@xatom.net>, linux-kernel@vger.kernel.org,
        Anthony Wong <anthony.wong@canonical.com>
References: <20191104154446.GH2552@lahna.fi.intel.com>
 <ea829adedf0445c0845e25d6e4b47905@AUSX13MPC105.AMER.DELL.COM>
 <d8cb6bc6-8145-eaed-5ba4-d7291478bdd7@molgen.mpg.de>
 <20191104162103.GI2552@lahna.fi.intel.com>
 <f0257624-920e-eec4-a2ec-7adf8ecbcc9d@molgen.mpg.de>
 <20191120105048.GY11621@lahna.fi.intel.com>
 <20191122105012.GD11621@lahna.fi.intel.com>
 <edfe1e3c-779b-61e4-8551-f2e13d46d733@molgen.mpg.de>
 <20191122112921.GF11621@lahna.fi.intel.com>
 <ae67c377-4763-4648-a91c-b9351e3b1cf1@molgen.mpg.de>
 <20191122114108.GG11621@lahna.fi.intel.com>
 <cf4140c8-5b92-f1e5-c9e4-e362ab06d6f8@linux.intel.com>
 <e5e3df06-4ddd-aadb-f1ad-6dd24fa2a5c2@molgen.mpg.de>
 <4b25e707-d2b5-11d1-4b16-48122828fde7@linux.intel.com>
 <a9e12353-6f88-edeb-0d78-15c1ac75666b@molgen.mpg.de>
 <87670037-8af5-c209-cbf8-70042e0a8fc5@linux.intel.com>
From:   Paul Menzel <pmenzel@molgen.mpg.de>
Message-ID: <44d8eb12-9af5-7b9a-fa24-be8e8ec3cd48@molgen.mpg.de>
Date:   Fri, 17 Jan 2020 10:56:57 +0100
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Dear Mathias, dear Mario,


On 2019-12-23 10:39, Mathias Nyman wrote:
> On 20.12.2019 16.25, Paul Menzel wrote:

>> On 2019-11-26 13:44, Mathias Nyman wrote:
>>> On 26.11.2019 13.33, Paul Menzel wrote:
>>
>>>> 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 wrot=
e:
>>>>>>>>>>> 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@dell.com wrote:
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> From: Mika Westerberg <mika.westerberg@linux.intel.com>
>>>>>>>>>>>>>>>> Sent: Monday, November 4, 2019 9:45 AM
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> On Mon, Nov 04, 2019 at 04:44:40PM +0200, Mika Westerber=
g wrote:
>>>>>>>>>>>>>>>>> On Mon, Nov 04, 2019 at 04:25:03PM +0200, Mika Westerbe=
rg 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=E2=80=99=
s Thunderbolt TB16
>>>>>>>>>>>>>>>>>>> dock connected, the USB input devices, keyboard and m=
ouse,
>>>>>>>>>>>>>>>>>>> connected to the TB16 stop working. They work for a f=
ew seconds
>>>>>>>>>>>>>>>>>>> (mouse cursor can be moved), but then stop working. T=
he 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 bu=
tton?
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> GNOME Shell 3.34.1+git20191024-1 is used, and the user jus=
t closes the
>>>>>>>>>>>>>> display. So more than `echo mem > /sys/power/state` is don=
e. What
>>>>>>>>>>>>>> distribution do you use?
>>>>>>>>>>>>>
>>>>>>>>>>>>> I have buildroot based "distro" so there is no UI running.
>>>>>>>>>>>>
>>>>>>>>>>>> Hmm, this is quite different from the =E2=80=9Cnormal=E2=80=9D=
 use-case of the these devices.
>>>>>>>>>>>> That way you won=E2=80=99t hit the bugs of the normal users.=
 ;-)
>>>>>>>>>>>
>>>>>>>>>>> Well, I can install some distro to that thing also :) I suppo=
se Debian
>>>>>>>>>>> 10.2 does have this issue, no?
>>>>>>>>>>>
>>>>>>>>>>>>>>>>> I tried v5.4-rc6 on my 9380 with TB16 dock connected an=
d did a couple of
>>>>>>>>>>>>>>>>> suspend/resume cycles (to s2idle) but I don't see any i=
ssues.
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> 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 n=
ot 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 other=
wise the USB
>>>>>>>>>>>> devices wouldn=E2=80=99t work at cold boot either.
>>>>>>>>>>>
>>>>>>>>>>> That does not sound right at all. There is the preboot ACL th=
at 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 port=
s (left
>>>>>>>>>>> side of the system marked with small lightning logo) or to th=
e normal
>>>>>>>>>>> Type-C ports (right side)?
>>>>>>>>>>>
>>>>>>>>>>>> So, I built Linux 5.4-rc8 (`make bindeb-pkg -j8`), but unfor=
tunately 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 Lin=
ux kernel detects
>>>>>>>>>>>> the devices and I do not see any disconnect events. But, `ls=
usb` does not list
>>>>>>>>>>>> the keyboard and the mouse. Is that expected.
>>>>>>>>>>>
>>>>>>>>>>> I'm bit confused. Can you describe the exact steps what you d=
o (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 no=
t work
>>>>>>>>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 anymore. They do not respond bu=
t 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=E2=80=99d say it=E2=80=99s only five secon=
ds or so.
>>>>>>>>>
>>>>>>>>>> This is on Ubuntu 19.10 with the 5.3 stock kernel.
>>>>>>>>>
>>>>>>>>> =E2=80=9Cstock=E2=80=9D in upstream=E2=80=99s or Ubuntu=E2=80=99=
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 prob=
lem
>>>>>>>>>> occurs it still shows the dock so PCIe link stays up.
>>>>>>>>>
>>>>>>>>> Re-connecting the USB devices does not help here, but I still s=
uspect it=E2=80=99s
>>>>>>>>> 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=E2=80=99t remember. Next week wou=
ld be the next chance
>>>>>>> to test this.
>>>>>>>
>>>>>>>>> Yesterday, I had my hand on a Dell XPS 13 7390 (10th Intel gene=
ration) 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 diff=
erent
>>>>>>> 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 captu=
red?
>>>
>>> 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.
>>
>>>>> There are issues with split transactions between the ASMedia host a=
nd the 7 port
>>>>> High speed hub built in to the dock.
>>>>>
>>>>> host reports a split transaction error for mouse or keyboard full-s=
peed/low-speed
>>>>> interrupt transactions. Endpoint doesn't recover after resetting it=
=2E
>>>>>
>>>>> 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 transact=
ion translator (TT)
>>>>> in the HS hub will translate the high-speed split transactions on i=
ts upstream port to
>>>>> low/full speed transactions on the downstream port.
>>>>>
>>>>> I'll see if there are any xHC parameters driver is setting that tri=
gger 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?
>> Sorry for bothering, but were you able to find some workaround for
>> this issue?
>=20
> Unfortunately no, I couldn't find any workaround.
> xhci slot and endpoint context values for both the HS hub, and the
> full/low speed device seem correct.
>=20
> I was able to reproduce the issue with an external HS hub as well, so=C2=
=A0 this issue
> appears to be more related to ASMedia host than the built in HS hub in =
TB16

I contacted the (German) Dell support, and they asked me to update the la=
ptop
firmware to 1.9.1 claiming that these issues might be fixed there (despit=
e the
change-log not containing that). Anyway, after the update, the user is st=
ill
able to reproduce the issue.

Mario, what can I do, so the issue is escalated to your team, so you can =
work
with ASMedia to solve this?


Kind regards,

Paul


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