linux-kernel - [PATCH 3/5] xhci: Switch Intel Lynx Point ports to EHCI on shutdown.

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Date:	Tue, 22 Apr 2014 15:23:00 +0300
From:	Mathias Nyman <mathias.nyman@...ux.intel.com>
To:	<gregkh@...uxfoundation.org>
Cc:	<linux-usb@...r.kernel.org>, <sarah.a.sharp@...ux.intel.com>,
	<linux-kernel@...r.kernel.org>,
	Denis Turischev <denis.turischev@...pulab.co.il>,
	Denis Turischev <denis@...pulab.co.il>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>
Subject: [PATCH 3/5] xhci: Switch Intel Lynx Point ports to EHCI on shutdown.

From: Denis Turischev <denis.turischev@...pulab.co.il>

The same issue like with Panther Point chipsets. If the USB ports are
switched to xHCI on shutdown, the xHCI host will send a spurious interrupt,
which will wake the system. Some BIOS have work around for this, but not all.
One example is Compulab's mini-desktop, the Intense-PC2.

The bug can be avoided if the USB ports are switched back to EHCI on
shutdown.

Signed-off-by: Denis Turischev <denis@...pulab.co.il>
Signed-off-by: Mathias Nyman <mathias.nyman@...ux.intel.com>
---
 drivers/usb/host/xhci-pci.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 47390e3..1715063 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -134,6 +134,8 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
 		 */
 		if (pdev->subsystem_vendor == PCI_VENDOR_ID_HP)
 			xhci->quirks |= XHCI_SPURIOUS_WAKEUP;
+
+		xhci->quirks |= XHCI_SPURIOUS_REBOOT;
 	}
 	if (pdev->vendor == PCI_VENDOR_ID_ETRON &&
 			pdev->device == PCI_DEVICE_ID_ASROCK_P67) {
-- 
1.8.3.2

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