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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(-)
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 16c98e7..422f216 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -1174,8 +1174,10 @@ static int acm_probe(struct usb_interface *intf,
/* 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));
@@ -1937,6 +1939,20 @@ static int acm_pre_reset(struct usb_interface *intf)
.driver_info = SEND_ZERO_PACKET,
},
+ /* 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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