On Mon, Oct 10, 2022 at 11:00:21AM -0500, Mario Limonciello wrote: > For optimal power consumption of USB4 routers the XHCI PCIe endpoint > used for tunneling must be in D3. Historically this is accomplished > by a long list of PCIe IDs that correspond to these endpoints because > the xhci_hcd driver will not default to allowing runtime PM for all > devices. > > As both AMD and Intel have released new products with new XHCI controllers > this list continues to grow. In reviewing the XHCI specification v1.2 on > page 607 there is already a requirement that the PCI power management > states D3hot and D3cold must be supported. > > In the quirk list, use this to indicate that runtime PM should be allowed > on XHCI controllers. The following controllers are known to be xHC 1.2 and > dropped explicitly: > * AMD Yellow Carp > * Intel Alder Lake > * Intel Meteor Lake > * Intel Raptor Lake > > Suggested-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx> > Link: https://www.intel.com/content/dam/www/public/us/en/documents/technical-specifications/extensible-host-controler-interface-usb-xhci.pdf > Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx> Reviewed-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
