[<prev] [next>] [day] [month] [year] [list]
Message-Id: <1447698128-15568-1-git-send-email-boris.brezillon@free-electrons.com>
Date: Mon, 16 Nov 2015 19:22:08 +0100
From: Boris Brezillon <boris.brezillon@...e-electrons.com>
To: Felipe Balbi <balbi@...com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-usb@...r.kernel.org, Alan Stern <stern@...land.harvard.edu>
Cc: Nicolas Ferre <nicolas.ferre@...el.com>,
Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Douglas Gilbert <dgilbert@...erlog.com>,
<stable@...r.kernel.org>
Subject: [PATCH] usb: gadget: atmel_usba_udc: Expose correct device speed
From: Douglas Gilbert <dgilbert@...erlog.com>
Following changes that appeared in lk 4.0.0, the gadget udc driver for
some ARM based Atmel SoCs (e.g. at91sam9x5 and sama5d3 families)
incorrectly deduced full-speed USB link speed even when the hardware
had negotiated a high-speed link. The fix is to make sure that the
UDPHS Interrupt Enable Register value does not mask the SPEED bit
in the Interrupt Status Register.
For a mass storage gadget this problem lead to failures when the host
had a USB 3 port with the xhci_hcd driver. If the host was a USB 2
port using the ehci_hcd driver then the mass storage gadget worked
(but probably at a lower speed than it should have).
Signed-of-by: Douglas Gilbert <dgilbert@...erlog.com>
Reviewed-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc: <stable@...r.kernel.org> #4.0+
Fixes: 9870d895ad87 ("usb: atmel_usba_udc: Mask status with enabled irqs")
---
drivers/usb/gadget/udc/atmel_usba_udc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/usb/gadget/udc/atmel_usba_udc.c b/drivers/usb/gadget/udc/atmel_usba_udc.c
index f0f2b06..f92f5af 100644
--- a/drivers/usb/gadget/udc/atmel_usba_udc.c
+++ b/drivers/usb/gadget/udc/atmel_usba_udc.c
@@ -1633,7 +1633,7 @@ static irqreturn_t usba_udc_irq(int irq, void *devid)
spin_lock(&udc->lock);
int_enb = usba_int_enb_get(udc);
- status = usba_readl(udc, INT_STA) & int_enb;
+ status = usba_readl(udc, INT_STA) & (int_enb | USBA_HIGH_SPEED);
DBG(DBG_INT, "irq, status=%#08x\n", status);
if (status & USBA_DET_SUSPEND) {
--
2.1.4
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists