Patch "usb: gadget: atmel_usba_udc: Expose correct device speed" has been added to the 4.2-stable tree

Patch "usb: gadget: atmel_usba_udc: Expose correct device speed" has been added to the 4.2-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    usb: gadget: atmel_usba_udc: Expose correct device speed

to the 4.2-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     usb-gadget-atmel_usba_udc-expose-correct-device-speed.patch
and it can be found in the queue-4.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From d134c48d889ddceadf4c990e6f3df16b816ed5d4 Mon Sep 17 00:00:00 2001
From: Douglas Gilbert <dgilbert@interlog.com>
Date: Mon, 16 Nov 2015 19:22:08 +0100
Subject: usb: gadget: atmel_usba_udc: Expose correct device speed

From: Douglas Gilbert <dgilbert@interlog.com>

commit d134c48d889ddceadf4c990e6f3df16b816ed5d4 upstream.

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-off-by: Douglas Gilbert <dgilbert@interlog.com>
Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Fixes: 9870d895ad87 ("usb: atmel_usba_udc: Mask status with enabled irqs")
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/usb/gadget/udc/atmel_usba_udc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/gadget/udc/atmel_usba_udc.c
+++ b/drivers/usb/gadget/udc/atmel_usba_udc.c
@@ -1634,7 +1634,7 @@ static irqreturn_t usba_udc_irq(int irq,
 	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) {


Patches currently in stable-queue which might be from dgilbert@interlog.com are

queue-4.2/usb-gadget-atmel_usba_udc-expose-correct-device-speed.patch