Hello!
On 10.06.2020 9:42, Kai-Heng Feng wrote:
USB2 devices with LPM enabled may interrupt the system suspend:
[ 932.510475] usb 1-7: usb suspend, wakeup 0
[ 932.510549] hub 1-0:1.0: hub_suspend
[ 932.510581] usb usb1: bus suspend, wakeup 0
[ 932.510590] xhci_hcd 0000:00:14.0: port 9 not suspended
[ 932.510593] xhci_hcd 0000:00:14.0: port 8 not suspended
..
[ 932.520323] xhci_hcd 0000:00:14.0: Port change event, 1-7, id 7, portsc: 0x400e03
..
[ 932.591405] PM: pci_pm_suspend(): hcd_pci_suspend+0x0/0x30 returns -16
[ 932.591414] PM: dpm_run_callback(): pci_pm_suspend+0x0/0x160 returns -16
[ 932.591418] PM: Device 0000:00:14.0 failed to suspend async: error -16
During system suspend, USB core will let HC suspends the device if it
Suspend. Perhaps can be fixed while applying...
doesn't have remote wakeup enabled and doesn't have any children.
However, from the log above we can see that the usb 1-7 doesn't get bus
suspended due to not in U0, because it requires a longer period for
disabling LPM. After a while the port finished its U2 -> U0 transition,
interrupts the suspend process.
Though PLC shouldn't be set for U2 -> U0 case, we can avoid all that by
directly put the port from U0/U1/U2 to U3, and solves this issue.
^ putting ^ it?
Suggested-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>
[...]
MBR, Sergei
