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iMX6 Local Alpha

Question asked by RICH OGRADY on Oct 5, 2017
Latest reply on Oct 6, 2017 by Victor Linnik

We are using local alpha (not in pixel but in a separate buffer) to combine a graphic plane and a video plane in kernel 4.1.15.  Everything works fine except whenever turning local alpha on or off via ioctl MXCFB_SET_LOC_ALPHA, the screen flashes. We tracked this down to mxc_ipuv3_fb.c where the ioctl is handled.  It seems this ioctl will always call the function mxcfb_set_par().  This function basically does a full reinit of fb0 and fb1 and causes the flashing. Turning global alpha on and off does not have such an issue.  Isn't there a cleaner way to turn on local alpha?