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From 37e541cbd166fcfd7a736d25ced4938647c9a167 Mon Sep 17 00:00:00 2001
From: Mykyta Dorokhin <mykyta.dorokhin@globallogic.com>
Date: Tue, 12 Jan 2021 23:20:37 +0200
Subject: [PATCH] linux-5.4-cdc-acm-ignore-exar-devices
---
drivers/usb/class/cdc-acm.c | 18 +++++++++++++++++-
1 file changed, 17 insertions(+), 1 deletion(-)
Updated for 5.4.195 on 24 May 2022 by John Klug
diff -Naru orig/drivers/usb/class/cdc-acm.c new/drivers/usb/class/cdc-acm.c
--- orig/drivers/usb/class/cdc-acm.c 2022-05-24 13:14:11.796098096 -0500
+++ new/drivers/usb/class/cdc-acm.c 2022-05-24 13:15:08.688096765 -0500
@@ -1186,8 +1186,10 @@
/* normal quirks */
quirks = (unsigned long)id->driver_info;
- if (quirks == IGNORE_DEVICE)
+ if (quirks == IGNORE_DEVICE) {
+ dev_dbg(&intf->dev, "Ignoring device\n");
return -ENODEV;
+ }
memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));
@@ -1976,6 +1978,20 @@
.driver_info = IGNORE_DEVICE,
},
+ /* Ignore Exar XR21V141X usb serial chips
+ * This elminates conflicting with the Exar vizzini driver.
+ * The ACM driver cannot use features in the Exar chip,
+ * such as setting the baud rate. */
+ {USB_DEVICE(0x04e2, 0x1410),
+ .driver_info = IGNORE_DEVICE,
+ },
+ {USB_DEVICE(0x04e2, 0x1412),
+ .driver_info = IGNORE_DEVICE,
+ },
+ {USB_DEVICE(0x04e2, 0x1414),
+ .driver_info = IGNORE_DEVICE,
+ },
+
/* control interfaces without any protocol set */
{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
USB_CDC_PROTO_NONE) },
--
1.9.1
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