[PATCH] usb: xhci-pci: Disable 64-bit DMA for VIA VL805

[Xincheng Zhang]

The VIA VL805 XHCI controller (Device ID 0x3483) fails to handle DMA
addresses correctly when they exceed 0x1000000000 (64GB). On systems
with large amounts of RAM, this hardware limitation causes device failures.

Add the XHCI_NO_64BIT_SUPPORT quirk to restrict DMA addressing to 32-bit,
preventing the controller from receiving addresses beyond its hardware
limit.

Signed-off-by: Xincheng Zhang <zhangxincheng@xxxxxxxxxxxxx>
---
 drivers/usb/host/xhci-pci.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 039c26b241d0..99c2dc3cebfe 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -448,6 +448,7 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
 	if (pdev->vendor == PCI_VENDOR_ID_VIA && pdev->device == PCI_DEVICE_ID_VIA_VL805) {
 		xhci->quirks |= XHCI_LPM_SUPPORT;
 		xhci->quirks |= XHCI_TRB_OVERFETCH;
+		xhci->quirks |= XHCI_NO_64BIT_SUPPORT;
 	}
 
 	if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&

---
base-commit: 502d801f0ab03e4f32f9a33d203154ce84887921
change-id: 20260623-xhci-via-dma-fix-c563b889ea54

Best regards,
--  
Xincheng Zhang <zhangxincheng@xxxxxxxxxxxxx>