xhci: Add Lynx Point to list of Intel switchable hosts.

The upcoming Intel Lynx Point chipset includes an xHCI host controller
that can have ports switched from the EHCI host controller, just like
the Intel Panther Point xHCI host.  This time, ports from both EHCI
hosts can be switched to the xHCI host controller.  The PCI config
registers to do the port switching are in the exact same place in the
xHCI PCI configuration registers, with the same semantics.

Hooray for shipping patches for next-gen hardware before the current gen
hardware is even available for purchase!

This patch should be backported to stable kernels as old as 3.0,
that contain commit 69e848c2090aebba5698a1620604c7dccb448684
"Intel xhci: Support EHCI/xHCI port switching."

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: stable@vger.kernel.org

diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index 01bb7241d6efd53f3769d47e86d59a28c5cf9ce2..123481793a47afcdfc22cf476a8a8ed14301c6e1 100644 (file)
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -360,7 +360,9 @@ static bool usb_is_intel_switchable_ehci(struct pci_dev *pdev)
 {
        return pdev->class == PCI_CLASS_SERIAL_USB_EHCI &&
                pdev->vendor == PCI_VENDOR_ID_INTEL &&
-               pdev->device == 0x1E26;
+               (pdev->device == 0x1E26 ||
+                pdev->device == 0x8C2D ||
+                pdev->device == 0x8C26);
 }
 
 static void ehci_enable_xhci_companion(void)

diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
index 39b2612342fd956fb54028b1eb9bfd622644e046..df0828cb2aa328ecf06cb37cb1a6981fa41d52f3 100644 (file)
--- a/drivers/usb/host/pci-quirks.c
+++ b/drivers/usb/host/pci-quirks.c
@@ -713,12 +713,28 @@ static int handshake(void __iomem *ptr, u32 mask, u32 done,
        return -ETIMEDOUT;
 }
 
-bool usb_is_intel_switchable_xhci(struct pci_dev *pdev)
+#define PCI_DEVICE_ID_INTEL_LYNX_POINT_XHCI    0x8C31
+
+bool usb_is_intel_ppt_switchable_xhci(struct pci_dev *pdev)
 {
        return pdev->class == PCI_CLASS_SERIAL_USB_XHCI &&
                pdev->vendor == PCI_VENDOR_ID_INTEL &&
                pdev->device == PCI_DEVICE_ID_INTEL_PANTHERPOINT_XHCI;
 }
+
+/* The Intel Lynx Point chipset also has switchable ports. */
+bool usb_is_intel_lpt_switchable_xhci(struct pci_dev *pdev)
+{
+       return pdev->class == PCI_CLASS_SERIAL_USB_XHCI &&
+               pdev->vendor == PCI_VENDOR_ID_INTEL &&
+               pdev->device == PCI_DEVICE_ID_INTEL_LYNX_POINT_XHCI;
+}
+
+bool usb_is_intel_switchable_xhci(struct pci_dev *pdev)
+{
+       return usb_is_intel_ppt_switchable_xhci(pdev) ||
+               usb_is_intel_lpt_switchable_xhci(pdev);
+}
 EXPORT_SYMBOL_GPL(usb_is_intel_switchable_xhci);
 
 /*