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path: root/drivers/usb/class/cdc-acm.c
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Diffstat (limited to 'drivers/usb/class/cdc-acm.c')
-rw-r--r--drivers/usb/class/cdc-acm.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 1b68fed464cb..ed8c62b2d9d1 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -581,6 +581,13 @@ static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
if (retval)
goto error_init_termios;
+ /*
+ * Suppress initial echoing for some devices which might send data
+ * immediately after acm driver has been installed.
+ */
+ if (acm->quirks & DISABLE_ECHO)
+ tty->termios.c_lflag &= ~ECHO;
+
tty->driver_data = acm;
return 0;
@@ -1657,6 +1664,9 @@ static const struct usb_device_id acm_ids[] = {
{ USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
},
+ { USB_DEVICE(0x0e8d, 0x2000), /* MediaTek Inc Preloader */
+ .driver_info = DISABLE_ECHO, /* DISABLE ECHO in termios flag */
+ },
{ USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
},