From d601d572e88964225f9b94838ff71619509cadfc Mon Sep 17 00:00:00 2001
From: Martin Neudorfer <martin.neudorfer@br-automation.com>
Date: Fri, 31 Oct 2025 14:32:00 +0100
Subject: [PATCH] fix force vsync on vxWorks Targets

---
 .../platforms/eglfs/api/qeglfsdeviceintegration.cpp    | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/plugins/platforms/eglfs/api/qeglfsdeviceintegration.cpp b/src/plugins/platforms/eglfs/api/qeglfsdeviceintegration.cpp
index 56fda45e905..6bedd82261e 100644
--- a/src/plugins/platforms/eglfs/api/qeglfsdeviceintegration.cpp
+++ b/src/plugins/platforms/eglfs/api/qeglfsdeviceintegration.cpp
@@ -27,6 +27,9 @@
 #include <linux/fb.h>
 #include <sys/ioctl.h>
 #endif
+#if defined(Q_OS_VXWORKS)
+#include <fbdev.h>
+#endif
 
 #include <private/qfactoryloader_p.h>
 #include <private/qcore_unix_p.h>
@@ -270,6 +273,13 @@ void QEglFSDeviceIntegration::waitForVSync(QPlatformSurface *surface) const
         if (ioctl(framebuffer, FBIO_WAITFORVSYNC, &arg) == -1)
             qWarning("Could not wait for vsync.");
     }
+#elif defined(Q_OS_VXWORKS)
+    static const bool forceSync = qEnvironmentVariableIntValue("QT_QPA_EGLFS_FORCEVSYNC");
+    if (forceSync && framebuffer != -1) {
+        int arg = 0;
+        if (ioctl(framebuffer, FB_IOCTL_VSYNC, &arg) == -1)
+            qWarning("Could not wait for vsync.");
+    }
 #endif
 }
 
-- 
2.47.1.windows.1