drm/radeon/dp: add back special handling for NUTMEG
BugLink: http://bugs.launchpad.net/bugs/1600092 When I fixed the dp rate selection in: 092c96a8 drm/radeon: fix dp link rate selection (v2) I accidently dropped the special handling for NUTMEG DP bridge chips. They require a fixed link rate. Reviewed-by: Christian König <christian.koenig@amd.com> Reviewed-by: Ken Wang <Qingqing.Wang@amd.com> Reviewed-by: Harry Wentland <harry.wentland@amd.com> Tested-by: Ken Moffat <zarniwhoop@ntlworld.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Cc: stable@vger.kernel.org (cherry picked from commit c8213a63) Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
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