linux-kernel - Re: [PATCH] usb: xhci: Renesas uPD720202 needs short TX quirk

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Date:   Fri, 18 Aug 2017 10:22:41 +0300
From:   Felipe Balbi <felipe.balbi@...ux.intel.com>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        mathias.nyman@...el.com
Cc:     gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Kai-Heng Feng <kai.heng.feng@...onical.com>
Subject: Re: [PATCH] usb: xhci: Renesas uPD720202 needs short TX quirk


hi,

Kai-Heng Feng <kai.heng.feng@...onical.com> writes:
> 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?

have you confirmed this is needed for this controller? Anybody from
Renesas has confirmed it? Do you have an errata document to refer to?

> [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@...onical.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) {

unnecessary

>  		xhci->quirks |= XHCI_RESET_ON_RESUME;
> +		xhci->quirks |= XHCI_TRUST_TX_LENGTH;

		xhci->quirks |= XHCI_RESET_ON_RESUME |
                		XHCI_TRUST_TX_LENGTH;

> +	}

unnecessary

-- 
balbi

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