linux-kernel - [PATCH 3.12 006/111] xhci: Switch only Intel Lynx Point-LP ports to EHCI on shutdown.

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Message-Id: <d0f30eb91a4beef22aa86c89a21d2492832f33c9.1403512280.git.jslaby@suse.cz>
Date:	Mon, 23 Jun 2014 10:30:41 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	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>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 006/111] xhci: Switch only Intel Lynx Point-LP ports to EHCI on shutdown.

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

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 0a939993bff117d3657108ca13b011fc0378aedb upstream.

Patch "xhci: Switch Intel Lynx Point ports to EHCI on shutdown."
commit c09ec25d3684cad74d851c0f028a495999591279 is not fully correct

It switches both Lynx Point and Lynx Point-LP ports to EHCI on shutdown.
On some Lynx Point machines it causes spurious interrupt,
which wake the system: bugzilla.kernel.org/show_bug.cgi?id=76291

On Lynx Point-LP on the contrary switching ports to EHCI seems to be
necessary to fix these spurious interrupts.

Signed-off-by: Denis Turischev <denis@...pulab.co.il>
Reported-by: Wulf Richartz <wulf.richartz@...il.com>
Cc: Mathias Nyman <mathias.nyman@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/usb/host/xhci-pci.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 17447ef59d08..f34b42e4c391 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -134,7 +134,9 @@ 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;
-
+	}
+	if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
+		pdev->device == PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_XHCI) {
 		xhci->quirks |= XHCI_SPURIOUS_REBOOT;
 	}
 	if (pdev->vendor == PCI_VENDOR_ID_ETRON &&
-- 
2.0.0

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