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drm/amd/display: Correct DML calculation to follow HW SPEC
[Why] In 2560x1600@240p eDP panel, driver use lowest voltage level to play 1080p video cause underflow. According to HW SPEC, the senario should use high voltage level. [How] ChromaPre value is zero when bandwidth validation. Correct ChromaPre calculation. Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com> Reviewed-by: Jun Lei <Jun.Lei@amd.com> Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com> Signed-off-by: Paul Hsieh <Paul.Hsieh@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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