Re: Reset thunderbolt topologies at bootup

Greg KH
2024-04-23T19:50:11Z

On Tue, Apr 23, 2024 at 01:54:27PM -0500, Mario Limonciello wrote:
> 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

The last one seems wrong, it's really
59a54c5f3dbde00b8ad30aef27fe35b1fe07bf5c, right?

thanks,

greg k-h