USB4 DP tunneling fix for 6.0.y/5.15.y

USB4 DP tunneling fix for 6.0.y/5.15.y

[Limonciello, Mario]

[Public]

Hi,

USB4 DP tunneling has a bug in 6.0.y and 5.15.y that was fixed in 6.1.
Basically if the Pre-OS connection manager has set up USB4 DP tunnels they're ignored by the OS so you'll have a "working" display in firmware and once the Linux kernel boots up you use lose the display.
Hot plugging works around the issue.

For 6.0.y can you please take this commit to fix it:
b60e31bf18a7 ("thunderbolt: Add DP OUT resource when DP tunnel is discovered")

For 5.15.y can you please take these two commits to fix it:
43bddb26e20a ("thunderbolt: Tear down existing tunnels when resuming from hibernate")
b60e31bf18a7 ("thunderbolt: Add DP OUT resource when DP tunnel is discovered")

Thanks,

Re: USB4 DP tunneling fix for 6.0.y/5.15.y

[Greg KH]

On Thu, Nov 10, 2022 at 03:36:30PM +0000, Limonciello, Mario wrote:
> [Public]
> 
> Hi,
> 
> USB4 DP tunneling has a bug in 6.0.y and 5.15.y that was fixed in 6.1.
> Basically if the Pre-OS connection manager has set up USB4 DP tunnels they're ignored by the OS so you'll have a "working" display in firmware and once the Linux kernel boots up you use lose the display.
> Hot plugging works around the issue.
> 
> For 6.0.y can you please take this commit to fix it:
> b60e31bf18a7 ("thunderbolt: Add DP OUT resource when DP tunnel is discovered")
> 
> For 5.15.y can you please take these two commits to fix it:
> 43bddb26e20a ("thunderbolt: Tear down existing tunnels when resuming from hibernate")
> b60e31bf18a7 ("thunderbolt: Add DP OUT resource when DP tunnel is discovered")

Now queued up, thanks.

greg k-h