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drm/radeon: don't probe MST on hw we don't support it on
If you do radeon.mst=1 on a gpu without mst hw, and then plug some mst hw it will oops instead of falling back. So check we have DCE5 at least before proceeding. Signed-off-by: Dave Airlie <[email protected]> Signed-off-by: Christian König <[email protected]>
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