https://bugzilla.kernel.org/show_bug.cgi?id=220460 --- Comment #5 from Mathias Nyman (mathias.nyman@xxxxxxxxxxxxxxx) --- Thanks, trace show the link between host and hub goes to an error state immediately after enabling U1 and U2 link power save states. Hub driver sends a SetPortFeature U1 timeout 41us to hub port 1. hub is now allowed to set port 1 link to U1 power save state after 41us of inactivity: 862.173255: xhci_queue_trb: CTRL: @0x00000000fffc7600 bRequestType 23 bRequest 03 wValue 0017 wIndex 2901 wLength 0 length 8 TD size 0 intr 0 type 'Setup Stage' flags I:i:c Tell xHCI host that the new MEL (maximum exit latency) to get link up and running has changed, set a new value of 747us: 862.173694: xhci_dbg_context_change: Set up evaluate context for LPM MEL change. 862.173696: xhci_configure_endpoint: RS 00001 super-speed Ctx Entries 3 MEL 747 us Port# 4/0 [TT Slot 0 Port# 0 TTT 0 Intr 0] Addr 0 State enabled/disabled Hub driver sends a SetPortFeature U2 timeout 16128us to hub port 1. hub is now allowed to set port 1 link to U1 power save state after 16128us of inactivity: 862.173771: xhci_queue_trb: CTRL: @0x00000000fffc7620 bRequestType 23 bRequest 03 wValue 0018 wIndex 3f01 wLength 0 length 8 TD size 0 intr 0 type 'Setup Stage' flags I:i:c Link suddenly goes to error (Inactive) state, most likely due to failure to enter U1/U2. Could also be related to bad U1,U2 MEL or SEL (system exit latecy) values. 862.175770: xhci_handle_event: EVENT: @0x00000000ff8facd0 TRB 0000000004000000 status 'Success' len 0 slot 0 ep 0 type 'Port Status Change Event' flags e:c 862.175802: xhci_handle_port_status: port 4-1: 0x004202c0 Powered Not-connected Disabled Link:Inactive PortSpeed:0 Change: CSC PLC Wake: -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
