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Subject[PATCH] usb: xhci: Renesas uPD720202 needs short TX quirk
Date
When plugging Logitech C920 webcam, warning messages filled up dmesg:
[77117.655018] xhci_hcd 0000:0c:00.0: WARN Successful completion on short TX: needs XHCI_TRUST_TX_LENGTH quirk?
[77117.659018] xhci_hcd 0000:0c:00.0: WARN Successful completion on short TX: needs XHCI_TRUST_TX_LENGTH quirk?
[77122.622952] handle_tx_event: 541 callbacks suppressed

No more warning messages with XHCI_TRUST_TX_LENGTH applied.

BugLink: https://bugs.launchpad.net/bugs/1710548
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
drivers/usb/host/xhci-pci.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 8071c8fdd15e..8566b43e19ba 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -202,8 +202,10 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
xhci->quirks |= XHCI_BROKEN_STREAMS;
}
if (pdev->vendor == PCI_VENDOR_ID_RENESAS &&
- pdev->device == 0x0015)
+ pdev->device == 0x0015) {
xhci->quirks |= XHCI_RESET_ON_RESUME;
+ xhci->quirks |= XHCI_TRUST_TX_LENGTH;
+ }
if (pdev->vendor == PCI_VENDOR_ID_VIA)
xhci->quirks |= XHCI_RESET_ON_RESUME;

--
2.14.1
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