PCI: Override Synopsys USB 3.x HAPS device class

Synopsys USB 3.x host HAPS platform has a class code of
PCI_CLASS_SERIAL_USB_XHCI, and xhci driver can claim it.  However, these
devices should use dwc3-haps driver.  Change these devices' class code to
PCI_CLASS_SERIAL_USB_DEVICE to prevent the xhci-pci driver from claiming
them.

Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 4700d24..b0a413f 100644 (file)
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -619,6 +619,30 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_NL_USB,
                quirk_amd_nl_class);
 
 /*
+ * Synopsys USB 3.x host HAPS platform has a class code of
+ * PCI_CLASS_SERIAL_USB_XHCI, and xhci driver can claim it.  However, these
+ * devices should use dwc3-haps driver.  Change these devices' class code to
+ * PCI_CLASS_SERIAL_USB_DEVICE to prevent the xhci-pci driver from claiming
+ * them.
+ */
+static void quirk_synopsys_haps(struct pci_dev *pdev)
+{
+       u32 class = pdev->class;
+
+       switch (pdev->device) {
+       case PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3:
+       case PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3_AXI:
+       case PCI_DEVICE_ID_SYNOPSYS_HAPSUSB31:
+               pdev->class = PCI_CLASS_SERIAL_USB_DEVICE;
+               pci_info(pdev, "PCI class overridden (%#08x -> %#08x) so dwc3 driver can claim this instead of xhci\n",
+                        class, pdev->class);
+               break;
+       }
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SYNOPSYS, PCI_ANY_ID,
+                        quirk_synopsys_haps);
+
+/*
  * Let's make the southbridge information explicit instead of having to
  * worry about people probing the ACPI areas, for example.. (Yes, it
  * happens, and if you read the wrong ACPI register it will put the machine