Commit be6646bf authored by Huang Rui's avatar Huang Rui Committed by Felipe Balbi

PCI: Prevent xHCI driver from claiming AMD Nolan USB3 DRD device

The AMD Nolan (NL) SoC contains a DesignWare USB3 Dual-Role Device that can
be operated either as a USB Host or a USB Device.  In the AMD NL platform,
this device ([1022:7912]) has a class code of PCI_CLASS_SERIAL_USB_XHCI
(0x0c0330), which means the xhci driver will claim it.

But the dwc3 driver is a more specific driver for this device, and we'd
prefer to use it instead of xhci.  To prevent xhci from claiming the
device, change the class code to 0x0c03fe, which the PCI r3.0 spec defines
as "USB device (not host controller)".  The dwc3 driver can then claim it
based on its Vendor and Device ID.
Suggested-by: default avatarHeikki Krogerus <heikki.krogerus@linux.intel.com>
Acked-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Cc: Jason Chang <jason.chang@amd.com>
Signed-off-by: default avatarHuang Rui <ray.huang@amd.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent c53a2b51
......@@ -378,6 +378,26 @@ static void quirk_ati_exploding_mce(struct pci_dev *dev)
}
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RS100, quirk_ati_exploding_mce);
/*
* In the AMD NL platform, this device ([1022:7912]) has a class code of
* PCI_CLASS_SERIAL_USB_XHCI (0x0c0330), which means the xhci driver will
* claim it.
* But the dwc3 driver is a more specific driver for this device, and we'd
* prefer to use it instead of xhci. To prevent xhci from claiming the
* device, change the class code to 0x0c03fe, which the PCI r3.0 spec
* defines as "USB device (not host controller)". The dwc3 driver can then
* claim it based on its Vendor and Device ID.
*/
static void quirk_amd_nl_class(struct pci_dev *pdev)
{
/*
* Use 'USB Device' (0x0c03fe) instead of PCI header provided
*/
pdev->class = 0x0c03fe;
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_NL_USB,
quirk_amd_nl_class);
/*
* Let's make the southbridge information explicit instead
* of having to worry about people probing the ACPI areas,
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment