I experienced the following WARN with a Renesas uPD720201 controller :
xhci_hcd 0000:02:00.0: WARN Successful completion on short TX: needs
XHCI_TRUST
Adding the XHCI_NEC_HOST quirk solved the issue.
It's possible that this doesn't apply to all Renesas hosts, however it appears
they only officially make 2 hosts, a 2 port (uPD720202) and 4 port (uPD720201)
this patch assumes they both benefit from the NEC quirk.
---
diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 3c898c1..6121411 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -38,6 +38,8 @@
#define PCI_DEVICE_ID_INTEL_LYNXPOINT_XHCI 0x8c31
#define PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_XHCI 0x9c31
+#define PCI_VENDOR_ID_RENESAS 0x1912
+
static const char hcd_name[] = "xhci_hcd";
/* called after powerup, by probe or system-pm "wakeup" */
@@ -95,6 +97,9 @@ static void xhci_pci_quirks(struct device *dev, struct
xhci_hcd *xhci)
if (pdev->vendor == PCI_VENDOR_ID_NEC)
xhci->quirks |= XHCI_NEC_HOST;
+ if (pdev->vendor == PCI_VENDOR_ID_RENESAS)
+ xhci->quirks |= XHCI_NEC_HOST;
+
if (pdev->vendor == PCI_VENDOR_ID_AMD && xhci->hci_version == 0x96)
xhci->quirks |= XHCI_AMD_0x96_HOST;
--
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