drm/i915: make FDI training a display function

Rather than branching in ironlake_pch_enable, add a new train_fdi
function to the display function pointer struct and use it instead.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Keith Packard <keithp@keithp.com>
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index e9d8243..4dbf4df 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -208,7 +208,7 @@
 			     struct drm_display_mode *adjusted_mode,
 			     int x, int y,
 			     struct drm_framebuffer *old_fb);
-
+	void (*fdi_link_train)(struct drm_crtc *crtc);
 	/* clock updates for mode set */
 	/* cursor updates */
 	/* render clock increase/decrease */