This is a note to let you know that I've just added the patch titled
usb: cdc-acm: Add DISABLE_ECHO for Renesas USB Download mode
to my usb git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git in the usb-linus branch.
The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.
If you have any questions about this process, please let me know.
From 6d853c9e4104b4fc8d55dc9cd3b99712aa347174 Mon Sep 17 00:00:00 2001
From: Chris Brandt chris.brandt@renesas.com Date: Wed, 11 Nov 2020 08:12:09 -0500 Subject: usb: cdc-acm: Add DISABLE_ECHO for Renesas USB Download mode
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(+)
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index 1e7568867910..f52f1bc0559f 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -1693,6 +1693,15 @@ static const struct usb_device_id acm_ids[] = { { 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 */ },