drm/amd/display: Change DCN2 vupdate start programming
[Why] In order to ensure that incoming flips are latched and complete immediately, we need to program the vupdate interrupt to come during the back porch of each frame. [How] Program the vupdate start_line to be in the back porch like it's done for DCN1. Signed-off-by: Eryk Brol <eryk.brol@amd.com> Reviewed-by: Aric Cyr <Aric.Cyr@amd.com> Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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