https://bugzilla.kernel.org/show_bug.cgi?id=218465 --- Comment #2 from Mathias Nyman (mathias.nyman@xxxxxxxxxxxxxxx) --- High-speed (HS) ans SuperSpeed (SS) ports are peered based on their Physical Location Description (_PLD) object in ACPI tables. The SSDT7 ACPI table dump shows that _PLD is created by calling a GPLD helper method with some parameters. For High-Speed ports (HS0x) this seems to be called with increasing port numer up to HS port 5. From port 6 onwards all parameters are 0. Scope (\_SB.PCI0.XHC.RHUB.HS01) Method (_PLD, 0, NotSerialized) // _PLD: Physical Location of Device Return (GPLD (One, One)) Scope (\_SB.PCI0.XHC.RHUB.HS02) Method (_PLD, 0, NotSerialized) // _PLD: Physical Location of Device Return (GPLD (One, 0x02)) ... Scope (\_SB.PCI0.XHC.RHUB.HS05) Method (_PLD, 0, NotSerialized) // _PLD: Physical Location of Device Return (GPLD (Zero, 0x05)) Scope (\_SB.PCI0.XHC.RHUB.HS06) Method (_PLD, 0, NotSerialized) // _PLD: Physical Location of Device Return (GPLD (Zero, Zero)) Scope (\_SB.PCI0.XHC.RHUB.HS07) Method (_PLD, 0, NotSerialized) // _PLD: Physical Location of Device Return (GPLD (Zero, Zero)) For SuperSpeed ports (SS0x) the same is true. Ports 1- Scope (\_SB.PCI0.XHC.RHUB.SS01) Method (_PLD, 0, NotSerialized) // _PLD: Physical Location of Device Return (GPLD (One, One)) Scope (\_SB.PCI0.XHC.RHUB.SS02) Method (_PLD, 0, NotSerialized) // _PLD: Physical Location of Device Return (GPLD (One, 0x02)) Scope (\_SB.PCI0.XHC.RHUB.SS03) Method (_PLD, 0, NotSerialized) // _PLD: Physical Location of Device Return (GPLD (Zero, Zero)) Scope (\_SB.PCI0.XHC.RHUB.SS04) Method (_UPC, 0, NotSerialized) // _UPC: USB Port Capabilities Return (GPLD (Zero, Zero)) Basically all HS port from 6 upwards and SS ports from 3 upwards report the same _PLD, this messes up port peering and results in the following messages during boot: usb usb2-port1: peered to usb1-port1 usb usb2-port2: peered to usb1-port2 usb usb2-port3: peered to usb1-port6 usb: failed to peer usb2-port4 and usb1-port6 by location (usb2-port4:none) (usb1-port6:usb2-port3) usb usb2-port4: failed to peer to usb1-port6 (-16) usb: port power management may be unreliable usb: failed to peer usb2-port5 and usb1-port6 by location (usb2-port5:none) (usb1-port6:usb2-port3) usb usb2-port5: failed to peer to usb1-port6 (-16) usb: failed to peer usb2-port6 and usb1-port6 by location (usb2-port6:none) (usb1-port6:usb2-port3) usb usb2-port6: failed to peer to usb1-port6 (-16) -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
