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[Why] dcn20_apply_ctx_for_surface can be called with 0 planes, which means we should blank the display. In this case when we get down to dcn20_setup_gsl_group_as_lock, pipe_ctx->plane_state is NULL, but we don't check for it. However, this function is only called by dcn20_pipe_control_lock, and in that function we alraedy have a local for the immediate flip status, which is what we care about in the plane state. [How] - pass in immediate flip status as parameter Signed-off-by: Joshua Aberback <joshua.aberback@amd.com> Reviewed-by: Krunoslav Kovac <Krunoslav.Kovac@amd.com> Acked-by: Leo Li <sunpeng.li@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>