• Douglas Gilbert's avatar
    usb: gadget: atmel_usba_udc: Expose correct device speed · d134c48d
    Douglas Gilbert authored
    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: default avatarDouglas Gilbert <dgilbert@interlog.com>
    Reviewed-by: default avatarBoris Brezillon <boris.brezillon@free-electrons.com>
    Cc: <stable@vger.kernel.org> #4.0+
    Fixes: 9870d895 ("usb: atmel_usba_udc: Mask status with enabled irqs")
    Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
atmel_usba_udc.c 54.2 KB