drm/i915: Use hotplug callback to retrain DP link
When a DP monitor is plugged back in, it needs to be retrained if it was
active before.
Signed-off-by: NKeith Packard <keithp@keithp.com>
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When a DP monitor is plugged back in, it needs to be retrained if it was
active before.
Signed-off-by: NKeith Packard <keithp@keithp.com>