drm/radeon/dp: fix lane/clock setup for dp 1.2 capable devices
commit 3b6d9fd23e015b5397c438fd3cd74147d2c805b6 upstream. Only DCE5+ asics support DP 1.2. Noticed by ArtForz on IRC. Signed-off-by:Alex Deucher <alexander.deucher@amd.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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