From dec08194ffeccfa1cf085906b53d301930eae18f Mon Sep 17 00:00:00 2001 From: Jiahau Chang Date: Mon, 19 Jun 2017 13:08:30 +0300 Subject: xhci: Limit USB2 port wake support for AMD Promontory hosts For AMD Promontory xHCI host, although you can disable USB 2.0 ports in BIOS settings, those ports will be enabled anyway after you remove a device on that port and re-plug it in again. It's a known limitation of the chip. As a workaround we can clear the PORT_WAKE_BITS. This will disable wake on connect, disconnect and overcurrent on AMD Promontory USB2 ports [checkpatch cleanup and commit message reword -Mathias] Cc: Cc: Tsai Nicholas Signed-off-by: Jiahau Chang Signed-off-by: Mathias Nyman Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci-hub.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/usb/host/xhci-hub.c') diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c index 0dde49c35dd2..1adae9eab831 100644 --- a/drivers/usb/host/xhci-hub.c +++ b/drivers/usb/host/xhci-hub.c @@ -1461,6 +1461,9 @@ int xhci_bus_suspend(struct usb_hcd *hcd) t2 |= PORT_WKOC_E | PORT_WKCONN_E; t2 &= ~PORT_WKDISC_E; } + if ((xhci->quirks & XHCI_U2_DISABLE_WAKE) && + (hcd->speed < HCD_USB3)) + t2 &= ~PORT_WAKE_BITS; } else t2 &= ~PORT_WAKE_BITS; -- cgit v1.2.1