linux-kernel - [PATCH] usb: host: xhci-rcar: Add XHCI_TRUST_TX

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Date:   Mon, 18 Feb 2019 11:26:34 +0100
From:   Spyridon Papageorgiou <spapageorgiou@...adit-jv.com>
To:     <mathias.nyman@...el.com>
CC:     <gregkh@...uxfoundation.org>, <yasano@...adit-jv.com>,
        <erosca@...adit-jv.com>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] usb: host: xhci-rcar: Add XHCI_TRUST_TX_LENGTH quirk

From: Yasushi Asano <yasano@...adit-jv.com>

When plugging BUFFALO LUA4-U3-AGT USB3.0 to Gigabit Ethernet LAN
Adapter, warning messages filled up dmesg.

[  101.098287] xhci-hcd ee000000.usb: WARN Successful completion on short TX for slot 1 ep 4: needs XHCI_TRUST_TX_LENGTH quirk?
[  101.117463] xhci-hcd ee000000.usb: WARN Successful completion on short TX for slot 1 ep 4: needs XHCI_TRUST_TX_LENGTH quirk?
[  101.136513] xhci-hcd ee000000.usb: WARN Successful completion on short TX for slot 1 ep 4: needs XHCI_TRUST_TX_LENGTH quirk?

Adding the XHCI_TRUST_TX_LENGTH quirk resolves the issue.

Signed-off-by: Yasushi Asano <yasano@...adit-jv.com>
Signed-off-by: Spyridon Papageorgiou <spapageorgiou@...adit-jv.com>
---
 drivers/usb/host/xhci-rcar.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/host/xhci-rcar.c b/drivers/usb/host/xhci-rcar.c
index a6e463715779..671bce18782c 100644
--- a/drivers/usb/host/xhci-rcar.c
+++ b/drivers/usb/host/xhci-rcar.c
@@ -246,6 +246,7 @@ int xhci_rcar_init_quirk(struct usb_hcd *hcd)
 	if (!xhci_rcar_wait_for_pll_active(hcd))
 		return -ETIMEDOUT;

+	xhci->quirks |= XHCI_TRUST_TX_LENGTH;
 	return xhci_rcar_download_firmware(hcd);
 }

-- 
2.20.1