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Message-ID: <20240523044507.GX1421138@black.fi.intel.com>
Date: Thu, 23 May 2024 07:45:07 +0300
From: Mika Westerberg <mika.westerberg@...ux.intel.com>
To: Mario Limonciello <mario.limonciello@....com>
Cc: Gia <giacomo.gio@...il.com>, "S, Sanath" <Sanath.S@....com>,
Benjamin Böhmke <benjamin@...hmke.net>,
Christian Heusel <christian@...sel.eu>,
Linux regressions mailing list <regressions@...ts.linux.dev>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"stable@...r.kernel.org" <stable@...r.kernel.org>,
"kernel@...ha.zone" <kernel@...ha.zone>,
Andreas Noever <andreas.noever@...il.com>,
Michael Jamet <michael.jamet@...el.com>,
Yehezkel Bernat <YehezkelShB@...il.com>,
"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: Re: [REGRESSION][BISECTED] "xHCI host controller not responding,
assume dead" on stable kernel > 6.8.7
On Wed, May 22, 2024 at 10:19:51AM -0500, Mario Limonciello wrote:
> On 5/22/2024 09:41, Gia wrote:
> > Now this is odd...
> >
> > I've tested another cable - a very short one used with a Gen3 nvme
> > enclosure that I'm sure it's working - and I got Gen2 20 Gbps. I also
> > have tested this on Windows 11 and I still just got a Gen2 connection.
> >
> > I was almost sure it was caused by a bad USB4 implementation by the PC
> > manufacturer, then I tried to connect a Thunderbolt 3 disk enclosure
> > via daisy chain to the Caldigit dock and I got the full Gen3 40 Gbps
> > connection! See the attached picture.
> >
>
> I suspect you can't actually get Gen 3 performance in this configuration.
> IIUC you should still be limited by the uplink to the host.
One "explanation" could be that the distance from the SoC to the Type-C
connector is relatively long which would require a retimer to get the
Gen3 speeds.
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