drm/i915: move encoder pre enable hooks togther on ilk+

The ->pre_enable hook is only used for the cpu edp port on ilk-ivb, so
we can safely move it up across the fdi pll enabling.

Unfortunately we can't (yet) merge in the pre_pll enable hook despite
that only lvds uses it on ilk-ivb: Since the same lvds hook is also
need on i9xx platforms we need to fix up the pll enabling sequence
there, too.
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -3198,9 +3198,12 @@ static void ironlake_crtc_enable(struct drm_crtc *crtc)
 
 	intel_update_watermarks(dev);
 
-	for_each_encoder_on_crtc(dev, crtc, encoder)
+	for_each_encoder_on_crtc(dev, crtc, encoder) {
 		if (encoder->pre_pll_enable)
 			encoder->pre_pll_enable(encoder);
+		if (encoder->pre_enable)
+			encoder->pre_enable(encoder);
+	}
 
 	if (intel_crtc->config.has_pch_encoder) {
 		/* Note: FDI PLL enabling _must_ be done before we enable the
@@ -3212,10 +3215,6 @@ static void ironlake_crtc_enable(struct drm_crtc *crtc)
 		assert_fdi_rx_disabled(dev_priv, pipe);
 	}
 
-	for_each_encoder_on_crtc(dev, crtc, encoder)
-		if (encoder->pre_enable)
-			encoder->pre_enable(encoder);
-
 	ironlake_pfit_enable(intel_crtc);
 
 	/*