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From: Mario Limonciello <mario.limonciello@amd.com>
To: "stable@vger.kernel.org" <stable@vger.kernel.org>
Subject: Reset thunderbolt topologies at bootup
Date: Tue, 23 Apr 2024 13:54:27 -0500	[thread overview]
Message-ID: <a06d9047-114f-4e63-b3b4-efcd83ca6d1e@amd.com> (raw)

Hi,

We've got a collection of bug reports about how if a Thunderbolt device 
is connected at bootup it doesn't behave the same as if it were 
hotplugged by the user after bootup.  Issues range from non-functional 
devices or display devices working at lower performance.

All of the issues stem from a pre-OS firmware initializing the USB4 
controller and the OS re-using those tunnels.  This has been fixed in 
6.9-rc1 by resetting the controller to a fresh state and discarding 
whatever firmware has done.  I'd like to bring it back to 6.6.y LTS and 
6.8.y stable.

01da6b99d49f6 thunderbolt: Introduce tb_port_reset()
b35c1d7b11da8 thunderbolt: Introduce tb_path_deactivate_hop()
ec8162b3f0683 thunderbolt: Make tb_switch_reset() support Thunderbolt 2, 
3 and USB4 routers
9a54c5f3dbde thunderbolt: Reset topology created by the boot firmware

Thanks!

             reply	other threads:[~2024-04-23 18:54 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-04-23 18:54 Mario Limonciello [this message]
2024-04-23 19:50 ` Reset thunderbolt topologies at bootup Greg KH
2024-04-23 19:51   ` Mario Limonciello
2024-04-23 19:52 ` Greg KH

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