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Message-ID: <e7227b7c-d544-42a2-8396-a7d104b54e31@amd.com>
Date: Tue, 21 May 2024 05:52:52 -0500
User-Agent: Mozilla Thunderbird
Subject: Re: [REGRESSION][BISECTED] "xHCI host controller not responding,
 assume dead" on stable kernel > 6.8.7
To: Mika Westerberg <mika.westerberg@linux.intel.com>,
 =?UTF-8?Q?Benjamin_B=C3=B6hmke?= <benjamin@boehmke.net>
Cc: Christian Heusel <christian@heusel.eu>,
 Linux regressions mailing list <regressions@lists.linux.dev>,
 Gia <giacomo.gio@gmail.com>,
 "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
 "stable@vger.kernel.org" <stable@vger.kernel.org>,
 "kernel@micha.zone" <kernel@micha.zone>,
 Andreas Noever <andreas.noever@gmail.com>,
 Michael Jamet <michael.jamet@intel.com>,
 Yehezkel Bernat <YehezkelShB@gmail.com>,
 "linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
 "S, Sanath" <Sanath.S@amd.com>
References: <CAHe5sWavQcUTg2zTYaryRsMywSBgBgETG=R1jRexg4qDqwCfdw@mail.gmail.com>
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 <20240520162100.GI1421138@black.fi.intel.com>
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 <20240521045940.GJ1421138@black.fi.intel.com>
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From: "Limonciello, Mario" <mario.limonciello@amd.com>
In-Reply-To: <20240521045940.GJ1421138@black.fi.intel.com>
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>> 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.