xhci: Add Intel extended cap / otg phy mux handling
The xHCI controller on various Intel SoCs has an extended cap mmio-range
which contains registers to control the muxing to the xHCI (host mode)
or the dwc3 (device mode) and vbus-detection for the otg usb-phy.
Having a role-sw driver included in the xHCI code (under drivers/usb/host)
is not desirable. So this commit adds a simple handler for this extended
capability, which creates a platform device with the caps mmio region as
resource, this allows us to write a separate platform role-sw driver for
the role-switch.
Note this commit adds a call to the new xhci_ext_cap_init() function
to xhci_pci_probe(), it is added here because xhci_ext_cap_init() must
be called only once. If in the future we also want to handle ext-caps
on non pci xHCI HCDs from xhci_ext_cap_init() a call to it should also
be added to other bus probe paths.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index d9f831b..f17b7ea 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -178,6 +178,7 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
pdev->device == PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI) {
xhci->quirks |= XHCI_SSIC_PORT_UNUSED;
+ xhci->quirks |= XHCI_INTEL_USB_ROLE_SW;
}
if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
(pdev->device == PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI ||
@@ -311,6 +312,10 @@ static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
goto dealloc_usb2_hcd;
}
+ retval = xhci_ext_cap_init(xhci);
+ if (retval)
+ goto put_usb3_hcd;
+
retval = usb_add_hcd(xhci->shared_hcd, dev->irq,
IRQF_SHARED);
if (retval)