From: "Guilherme G. Piccoli" gpiccoli@igalia.com
[ Upstream commit e585a37e5061f6d5060517aed1ca4ccb2e56a34c ]
By running a Van Gogh device (Steam Deck), the following message was noticed in the kernel log:
pci 0000:04:00.3: PCI class overridden (0x0c03fe -> 0x0c03fe) so dwc3 driver can claim this instead of xhci
Effectively this means the quirk executed but changed nothing, since the class of this device was already the proper one (likely adjusted by newer firmware versions).
Check and perform the override only if necessary.
Link: https://lore.kernel.org/r/20231120160531.361552-1-gpiccoli@igalia.com Signed-off-by: Guilherme G. Piccoli gpiccoli@igalia.com Signed-off-by: Bjorn Helgaas bhelgaas@google.com Cc: Huang Rui ray.huang@amd.com Cc: Vicki Pfau vi@endrift.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pci/quirks.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 5d8768cd7c50..18716964013b 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -604,10 +604,13 @@ static void quirk_amd_dwc_class(struct pci_dev *pdev) { u32 class = pdev->class;
- /* Use "USB Device (not host controller)" class */ - 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); + if (class != PCI_CLASS_SERIAL_USB_DEVICE) { + /* Use "USB Device (not host controller)" class */ + 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); + } } DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_NL_USB, quirk_amd_dwc_class);