3ce224421b
[why] Underflow is asserted due to some timing condition which does not actually result in visible underflow (i.e. it occurs while blanked). [how] Force clear underflow occured bit whenver we unblank. Signed-off-by: Jun Lei <Jun.Lei@amd.com> Reviewed-by: Tony Cheng <Tony.Cheng@amd.com> Acked-by: Aric Cyr <Aric.Cyr@amd.com> Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>