From patchwork Mon Nov 7 17:59:20 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [2/2] xHCI: Clear PLC for USB2 root hub ports Date: Mon, 07 Nov 2011 07:59:20 -0000 From: Steve Conklin X-Patchwork-Id: 124160 Message-Id: <4EB81C78.9090308@canonical.com> To: kernel-team@lists.ubuntu.com -------- Original Message -------- Subject: [PATCH 2/2] xHCI: Clear PLC for USB2 root hub ports Date: Fri, 4 Nov 2011 13:20:56 -0700 From: Sarah Sharp To: stable@vger.kernel.org CC: Andiry Xu , Don Zickus , Steve Conklin From: Andiry Xu When the link state changes, xHC will report a port status change event and set the PORT_PLC bit, for both USB3 and USB2 root hub ports. The PLC will be cleared by usbcore for USB3 root hub ports, but not for USB2 ports, because they do not report USB_PORT_STAT_C_LINK_STATE in wPortChange. Clear it for USB2 root hub ports in handle_port_status(). Signed-off-by: Andiry Xu Signed-off-by: Sarah Sharp Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci-ring.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 831d0d4..0338ca9 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -1354,6 +1354,10 @@ static void handle_port_status(struct xhci_hcd *xhci, } } + if (hcd->speed != HCD_USB3) + xhci_test_and_clear_bit(xhci, port_array, faked_port_index, + PORT_PLC); + cleanup: /* Update event ring dequeue pointer before dropping the lock */ inc_deq(xhci, xhci->event_ring, true);