drm/edid: Clear the old cea_rev when there's no CEA extension in the new EDID
It's not a good idea to leave stale cea_rev in the drm_display_info. The current EDID might not even have a CEA ext block in which case we'd end up leaving the stale value in place. Signed-off-by:Ville Syrjälä <ville.syrjala@linux.intel.com> Acked-by:
Christian König <christian.koenig@amd.com> Reviewed-by:
Alex Deucher <alexander.deucher@amd.com> Signed-off-by:
Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/1475070703-6435-8-git-send-email-ville.syrjala@linux.intel.com
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