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usb: cdc-acm: Add DISABLE_ECHO for Renesas USB Download mode

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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>
This commit is contained in:
Chris Brandt 2020-11-11 08:12:09 -05:00 committed by Greg Kroah-Hartman
parent 4df694a477
commit 6d853c9e41
1 changed files with 9 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

9
drivers/usb/class/cdc-acm.c
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@ -1693,6 +1693,15 @@ static const struct usb_device_id acm_ids[] = {
{ USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */ { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
.driver_info = NO_UNION_NORMAL, /* has no union descriptor */ .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 */ { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
.driver_info = NO_UNION_NORMAL, /* has no union descriptor */ .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
}, },