jianglianfang opened a new pull request, #12980:
URL: https://github.com/apache/nuttx/pull/12980

   ## Summary
   add fb_vsync_pollnotify for sim and goldfish_fb
   when the vsync comes, fb drivers should call fb_vsync_pollnotify to notify 
POLLPRI, so that users can catch the synchronization time of vsync and do 
something
   ## Impact
   users can catch the synchronization time of vsync
   ## Testing
   None


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