drm/radeon/kms: add pcie get/set lane support for r6xx/r7xx/evergreen
Signed-off-by:Alex Deucher <alexdeucher@gmail.com> Signed-off-by:
Dave Airlie <airlied@redhat.com>
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Signed-off-by:Alex Deucher <alexdeucher@gmail.com> Signed-off-by:
Dave Airlie <airlied@redhat.com>