On 2/18/2022 7:55 PM, Mika Westerberg wrote: > On Fri, Feb 18, 2022 at 07:38:23PM +0530, Sanjay R Mehta wrote: >> >> >> On 2/18/2022 4:43 PM, Mika Westerberg wrote: >>> Hi Sanjay, >>> >>> On Fri, Feb 18, 2022 at 01:11:25AM -0600, Sanjay R Mehta wrote: >>>> From: Sanjay R Mehta <sanju.mehta@xxxxxxx> >>>> >>>> All DP resources are released during suspend and while >>>> resuming back DP IN resource is not available, therefore >>>> unable to find DP pair to re-establish the DP tunnel. >>> >>> It should get plug event for the DP IN adapters once the router comes >>> back from sleep. Is that not happening here? >> >> Yes, plug event is not happening for the DP IN adapter after resume. >> >> The DP In resources are put into tcm->dp_resources list as part of host >> router enumeration. But when it resumes from sleep, there is no plug >> event happening for DP IN, hence DP IN resource will not be in >> tcm->dp_resources list. > > Right but if I understand the spec correctly you should get a new > hotplug event for the DP IN adapters once the host router is moved back > to "enumerated" state. This is how Intel hardware works at least (and > this is the understanding I have from the USB4 spec too). Do you see > anything in the log wrt. this when you resume the domain? Thanks Mika. I'll re-look at this scenario on our system and will check if anything needs to be taken care of. Thank you for the valuable input :). >
