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    Subject[PATCH 4.19 070/101] usb: cdc-acm: Add DISABLE_ECHO for Renesas USB Download mode
    Date
    From: Chris Brandt <chris.brandt@renesas.com>

    commit 6d853c9e4104b4fc8d55dc9cd3b99712aa347174 upstream.

    Renesas R-Car and RZ/G SoCs have a firmware download mode over USB.
    However, on reset a banner string is transmitted out which is not expected
    to be echoed back and will corrupt the protocol.

    Cc: stable <stable@vger.kernel.org>
    Acked-by: Oliver Neukum <oneukum@suse.com>
    Signed-off-by: Chris Brandt <chris.brandt@renesas.com>
    Link: https://lore.kernel.org/r/20201111131209.3977903-1-chris.brandt@renesas.com
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/usb/class/cdc-acm.c | 9 +++++++++
    1 file changed, 9 insertions(+)

    --- a/drivers/usb/class/cdc-acm.c
    +++ b/drivers/usb/class/cdc-acm.c
    @@ -1738,6 +1738,15 @@ static const struct usb_device_id acm_id
    { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
    .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
    },
    + { USB_DEVICE(0x045b, 0x023c), /* Renesas USB Download mode */
    + .driver_info = DISABLE_ECHO, /* Don't echo banner */
    + },
    + { USB_DEVICE(0x045b, 0x0248), /* Renesas USB Download mode */
    + .driver_info = DISABLE_ECHO, /* Don't echo banner */
    + },
    + { USB_DEVICE(0x045b, 0x024D), /* Renesas USB Download mode */
    + .driver_info = DISABLE_ECHO, /* Don't echo banner */
    + },
    { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
    .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
    },

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