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 the 5.4-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-cdc-acm-add-disable_echo-for-renesas-usb-download-mode.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6d853c9e4104b4fc8d55dc9cd3b99712aa347174 Mon Sep 17 00:00:00 2001
From: Chris Brandt <chris.brandt@xxxxxxxxxxx>
Date: Wed, 11 Nov 2020 08:12:09 -0500
Subject: usb: cdc-acm: Add DISABLE_ECHO for Renesas USB Download mode
From: Chris Brandt <chris.brandt@xxxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
Acked-by: Oliver Neukum <oneukum@xxxxxxxx>
Signed-off-by: Chris Brandt <chris.brandt@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20201111131209.3977903-1-chris.brandt@xxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -1706,6 +1706,15 @@ 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@xxxxxxxxx */
.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
},
Patches currently in stable-queue which might be from chris.brandt@xxxxxxxxxxx are
queue-5.4/usb-cdc-acm-add-disable_echo-for-renesas-usb-download-mode.patch
