usb: xhci: handle Config Error Change (CEC) in xhci driver

commit 9425183d177aa4a2f09d01a74925124f0778b595 upstream.

Linux xHCI driver doesn't report and handle port cofig error change.
If Port Configure Error for root hub port occurs, CEC bit in PORTSC
would be set by xHC and remains 1. This happends when the root port
fails to configure its link partner, e.g. the port fails to exchange
port capabilities information using Port Capability LMPs.

Then the Port Status Change Events will be blocked until all status
change bits(CEC is one of the change bits) are cleared('0') (refer to
xHCI spec 4.19.2). Otherwise, the port status change event for this
root port will not be generated anymore, then root port would look
like dead for user and can't be recovered until a Host Controller

This patch is to check CEC bit in PORTSC in xhci_get_port_status()
and set a Config Error in the return status if CEC is set. This will
cause a ClearPortFeature request, where CEC bit is cleared in

[The commit log is based on initial Marvell patch posted at]

Reported-by: Gregory CLEMENT <>
Signed-off-by: Lu Baolu <>
Signed-off-by: Mathias Nyman <>
Signed-off-by: Greg Kroah-Hartman <>
[bwh: Backported to 3.2:
 - Fix indentation
 - s/raw_port_status/temp/]
Signed-off-by: Ben Hutchings <>
1 file changed