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From: Luke Nowakowski-Krijger <luke.nowakowskikrijger@canonical.com>
To: linux-usb@vger.kernel.org
Cc: hdegoede@redhat.com, mathias.nyman@linux.intel.com,
	chris.chiu@canonical.com, stern@rowland.harvard.edu,
	kishon@ti.com
Subject: Deferring xhci primary roothub registration
Date: Mon,  4 Apr 2022 09:38:39 -0700	[thread overview]
Message-ID: <20220404163839.19102-1-luke.nowakowskikrijger@canonical.com> (raw)

Hello,

There have been some users using Ubuntu 5.4 based kernels with certain intel xHCI controllers that are experiencing USB devices not being detected during boot [4][5].
This problem seems to have been reintroduced after the patchset that deferred primary roothub registration to address device enumeration before
xHC is running was reverted due to regressions [1][2].

My question is if there has been any efforts to reintroduce these patches or any other fixes that I am not aware of to address the original problem [3]?
There seem to have been many bug fixes addressing the problems referenced in the original regression report [2] to do with this patch series,
is there anything in the way of reintroducing these patches? From only looking at the mailing list discussions and various bug reports, I still am not exactly
sure what the problems with these patches were in the first place.

Anyways, these things seem pretty tricky and I would appreciate any insight on the matter :)

Thanks,
- Luke

[1] https://lore.kernel.org/all/20211104141158.561738875@linuxfoundation.org/
[2] https://lore.kernel.org/all/42bcbea6-5eb8-16c7-336a-2cb72e71bc36@redhat.com/
[3] https://bugzilla.kernel.org/show_bug.cgi?id=214021
[4] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1939638
[5] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1945211

             reply	other threads:[~2022-04-04 21:25 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-04 16:38 Luke Nowakowski-Krijger [this message]
2022-04-07 16:48 ` Mathias Nyman

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