drm/amd/display: Disable pipe split for modes with borders
[Why] For some special timing with border, like DMT 640*480 72Hz, pipe split can't handle well. Thus, it will be black screen for these special timing. [How] Disable pipe split for these timing with borders as W/A. Signed-off-by: Dale Zhao <dale.zhao@amd.com> Reviewed-by: Tony Cheng <Tony.Cheng@amd.com> Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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