drm/i915: manual FDI training for Ivy Bridge
A0 stepping chips need to use manual training, but the bits have all moved. So fix things up so we can at least train FDI for VGA links. Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org> Reviewed-by: NKeith Packard <keithp@keithp.com> Signed-off-by: NKeith Packard <keithp@keithp.com>
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