Re: [PATCH v3] PCI: Skip Target Speed quirk on clamped ports with no link

[Maciej W. Rozycki]

On Fri, 18 Sep 2026, Thorsten Leemhuis wrote:

> That being said and wrt to the "a lot going on": seems this causes some
> devices to not work for iirc at least two reporters. Would it maybe be
> better to revert the culprit and reapply it later once that is sorted
> out? Or is this not an option or a bad one for some reason? Reminder,
> normally Linus in a situation like this wants regressions ideally 'fixed
> "within a week", preferably before the next rc':
> https://lore.kernel.org/all/CAHk-%3Dwi86AosXs66-yi54%2BmpQjPu0upxB8ZAfG%2BLsMyJmcuMSA@xxxxxxxxxxxxxx/

 Reverting will cause other configurations to regress, so this would be 
replacing one regression with another.  We seem to be in a situation where 
there are all kinds of breakage out there worked around by the system boot 
firmware by capping the link speed, and this quirk interferes with that.

 One way to handle this could be by having a list of downstream devices 
never to remove link capping for.  But that seems like a recipe for an
ongoing maintaince burden.

 Ideally we'd handle all the cases gracefully, even possibly out-of-spec 
ones, but it seems more and more evident that this may not be possible.  
It may be that the quirk will have to be dropped entirely after all.

 Thoughts?

  Maciej