drm/amd/display: Wait for VBLANK during pipe programming
[Description] - Wait for vblank during front end programming for global sync to ensure all double buffer updates take. - This prevents underflow in some cases. Reviewed-by: Martin Leung <Martin.Leung@amd.com> Acked-by: Alan Liu <HaoPing.Liu@amd.com> Signed-off-by: Alvin Lee <Alvin.Lee2@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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