From: Mika Westerberg <mika.westerberg@linux.intel.com>
To: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: whitequark <whitequark@whitequark.org>,
Mario Limonciello <mario.limonciello@dell.com>,
linux-kernel@vger.kernel.org
Subject: Re: USB type-C altmode support for UCSI
Date: Wed, 5 Sep 2018 16:34:50 +0300 [thread overview]
Message-ID: <20180905133450.GM2283@lahna.fi.intel.com> (raw)
In-Reply-To: <20180905132429.GB25121@kuha.fi.intel.com>
On Wed, Sep 05, 2018 at 04:24:29PM +0300, Heikki Krogerus wrote:
> +Mika, Mario, LKML
>
> On Mon, Sep 03, 2018 at 02:17:46PM +0000, whitequark wrote:
> > After looking through LKML, I've seen that people refer to you when
> > discussing issues with USB-C device compatibility. Do you think you
> > could help me with an Apple Thunderbolt 2 to 3 adapter? I've spent
> > quite a while studying USB-C, reverse engineering platform and
> > adapter firmware and so on, and I'm quite stumped.
> >
> > I have a Dell XPS13 laptop. UCSI advertises port altmodes
> > 8087:00000001, ff01:00001c46, 413c:00000001, in that order.
> > When I plug in the adapter, UCSI advertises partner altmode
> > 8087:00000001. A billboard class device enumerates. Nothing else
> > happens; the Thunderbolt NHI device doesn't appear, and if I force
> > it to appear via the WMI hook, there are no Thunderbolt events,
> > and the only device on the Thunderbolt bus is the root switch.
Some Dell XPS systems do not support that TBT2<->TBT3 adapter. I think I
tried this on XPS 15 9550 and XPS 13 9365 and in both cases it is
rejected. I think it has something to do with the PD controller
firmware. Same goes if you Plug TB16 dock and to that dock then connect
the adapter + device.
Mario probably has more input about this one.
next prev parent reply other threads:[~2018-09-05 13:34 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1e8398f2c1790890f40b69f12e2934e3@whitequark.org>
[not found] ` <20180903140623.GD15112@kuha.fi.intel.com>
[not found] ` <28522bb57c5d8f49416b9174b19b1625@whitequark.org>
2018-09-05 13:24 ` USB type-C altmode support for UCSI Heikki Krogerus
2018-09-05 13:34 ` Mika Westerberg [this message]
2018-09-05 13:50 ` Mario.Limonciello
2018-09-05 14:13 ` whitequark
2018-09-07 11:04 ` whitequark
2018-09-10 21:25 ` Mario.Limonciello
2018-09-11 9:32 ` Mika Westerberg
2018-09-11 13:02 ` Mario.Limonciello
2018-10-06 6:01 ` A different PD controller firmware problem? Theodore Y. Ts'o
2018-11-08 18:00 ` Mario.Limonciello
2018-11-08 21:15 ` Theodore Y. Ts'o
2018-11-10 20:13 ` Theodore Y. Ts'o
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