drm/amd/display: Reinstate LFC optimization
[why] We want to streamline the calculations made when entering LFC. Previously, the optimizations led to screen tearing and were backed out to unblock development. [how] Integrate other calculations parameters, as well as screen tearing, fixes with the original LFC calculation optimizations. Signed-off-by: NAmanda Liu <amanda.liu@amd.com> Reviewed-by: NAric Cyr <Aric.Cyr@amd.com> Acked-by: NRodrigo Siqueira <Rodrigo.Siqueira@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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