DTG needs to be completely stopped before changing the display resolution through modesetting. If DTG is not stopped, any change in resolution could result in unpredictable results, like split screen, etc. This patch fixes that by introducing a completion signaling mechanism so that we can signal the DRM CRTC when DCSS core is done stopping DTG. Signed-off-by: Laurentiu Palcu <laurentiu.palcu@nxp.com>