linux-kernel - Re: [REGRESSION][BISECTED] "xHCI host controller not responding, assume dead" on stable kernel

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Message-ID: <e7227b7c-d544-42a2-8396-a7d104b54e31@amd.com>
Date: Tue, 21 May 2024 05:52:52 -0500
From: "Limonciello, Mario" <mario.limonciello@....com>
To: Mika Westerberg <mika.westerberg@...ux.intel.com>,
 Benjamin Böhmke <benjamin@...hmke.net>
Cc: Christian Heusel <christian@...sel.eu>,
 Linux regressions mailing list <regressions@...ts.linux.dev>,
 Gia <giacomo.gio@...il.com>,
 "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>,
 "S, Sanath" <Sanath.S@....com>
Subject: Re: [REGRESSION][BISECTED] "xHCI host controller not responding,
 assume dead" on stable kernel > 6.8.7


>> I still don't understand why this happened as it was working great for
>> years and is still working with kernels 6.8.7 or older. But
>> nevertheless sorry if I wasted time of anyone because of broken
>> hardware.
> 
> I think the BIOS CM creates the "first" tunnel using reduced
> capabilities already so this makes the "second" tunnel fit there in the
> 18G link. Now that we do the reset the "first" tunnel is re-created with
> max capabilities and that makes the "second" not to fit there anymore.
> 
> But now you get the full 40G link :)

Well that's awesome!  That confirms there were other issues besides the 
one Sanath found that get fixed by not reusing BIOS tunnels.