drm/i915: Initiate DP link training only on the lanes we'll be using
Limit the link training setting command to the lanes needed for the current mode. It seems vaguely possible that a monitor will try to train the other lanes and fail in some way, so this seems like the safer plan. Signed-off-by: Keith Packard <keithp@keithp.com> Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
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