From 35e7fddc733c9abb7a6d6aae21994ca8bf053581 Mon Sep 17 00:00:00 2001
From: Trevor <4226647+trejan@users.noreply.github.com>
Date: Tue, 30 Apr 2024 16:53:25 +0100
Subject: [PATCH] Add missing capability bit for CDC ACM serial break support

The send break capability bit is needed for serial break support with Linux and possibly MacOS hosts. [A recent Linux kernel patch made it check the ACM capability bits before sending a serial break](https://github.com/raspberrypi/linux/commit/19e321c3eedd4c681a49f532a196bead5d57205e).
---
 src/device/usbd.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/device/usbd.h b/src/device/usbd.h
index 0197628e2c..f367340406 100644
--- a/src/device/usbd.h
+++ b/src/device/usbd.h
@@ -221,8 +221,8 @@ TU_ATTR_WEAK bool tud_vendor_control_xfer_cb(uint8_t rhport, uint8_t stage, tusb
   5, TUSB_DESC_CS_INTERFACE, CDC_FUNC_DESC_HEADER, U16_TO_U8S_LE(0x0120),\
   /* CDC Call */\
   5, TUSB_DESC_CS_INTERFACE, CDC_FUNC_DESC_CALL_MANAGEMENT, 0, (uint8_t)((_itfnum) + 1),\
-  /* CDC ACM: support line request */\
-  4, TUSB_DESC_CS_INTERFACE, CDC_FUNC_DESC_ABSTRACT_CONTROL_MANAGEMENT, 2,\
+  /* CDC ACM: support line request + send break */\
+  4, TUSB_DESC_CS_INTERFACE, CDC_FUNC_DESC_ABSTRACT_CONTROL_MANAGEMENT, 6,\
   /* CDC Union */\
   5, TUSB_DESC_CS_INTERFACE, CDC_FUNC_DESC_UNION, _itfnum, (uint8_t)((_itfnum) + 1),\
   /* Endpoint Notification */\