linux-kernel - [PATCH 2/2] xhci: EHCI/XHCI ports switching on Intense-PC.

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Date:	Mon, 23 Jul 2012 14:46:32 +0300
From:	Denis Turischev <denis@...pulab.co.il>
To:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
CC:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 2/2] xhci: EHCI/XHCI ports switching on Intense-PC.

Intense-PC is Compulab's mini-desktop with Intel Panther Point
chipset.

Unconditional switchover to xHCI provided by function
usb_enable_xhci_ports() leads to surprising results, after shutdown
system powered-on again after a few seconds. On Windows power
related problems were not observed. Switching back to EHCI solves
the problem.

The patch switches usb ports back to EHCI during xhci shutdown
for Intense-PC.

Signed-off-by: Denis Turischev <denis@...pulab.co.il>
---
 drivers/usb/host/xhci.c |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index a979cd0..541efaa 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -26,6 +26,8 @@
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/slab.h>
+#include <linux/dmi.h>
+#include "pci-quirks.h"

 #include "xhci.h"

@@ -656,8 +658,20 @@ void xhci_stop(struct usb_hcd *hcd)
  */
 void xhci_shutdown(struct usb_hcd *hcd)
 {
+	struct pci_dev *pdev;
+	const char *brd_name;
 	struct xhci_hcd *xhci = hcd_to_xhci(hcd);

+	pdev = to_pci_dev(hcd->self.controller);
+
+	if (usb_is_intel_switchable_xhci(pdev)) {
+		brd_name = dmi_get_system_info(DMI_BOARD_NAME);
+
+		/* quirk for Compulab's Intense-PC board */
+		if (brd_name && strstr(brd_name, "Intense-PC"))
+			usb_disable_xhci_ports(pdev);
+	}
+
 	spin_lock_irq(&xhci->lock);
 	xhci_halt(xhci);
 	spin_unlock_irq(&xhci->lock);
-- 
1.7.9.5

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