linux-kernel - [PATCH 5.9 201/255] usb: cdc-acm: Add DISABLE

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Date:   Tue, 17 Nov 2020 14:05:41 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Oliver Neukum <oneukum@...e.com>,
        Chris Brandt <chris.brandt@...esas.com>
Subject: [PATCH 5.9 201/255] usb: cdc-acm: Add DISABLE_ECHO for Renesas USB Download mode

From: Chris Brandt <chris.brandt@...esas.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@...r.kernel.org>
Acked-by: Oliver Neukum <oneukum@...e.com>
Signed-off-by: Chris Brandt <chris.brandt@...esas.com>
Link: https://lore.kernel.org/r/20201111131209.3977903-1-chris.brandt@renesas.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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
@@ -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@...il.com */
 	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
 	},