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

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Message-ID: <52F0CAB8.20803@compulab.co.il>
Date:	Tue, 04 Feb 2014 13:10:48 +0200
From:	Denis Turischev <denis.turischev@...pulab.co.il>
To:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
CC:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: [PATCH] xhci: Switch Intel Lynx Point ports to EHCI on shutdown.

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>
---
 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 3c898c1..9233d12 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) {
-- 
1.8.1.2

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