drm/i915: move backlight enable later in vlv enable sequence

Follow-up to
commit 5004945f1d6c0282c0288afa89ad85d7f2bea4d5
Author: Jani Nikula <jani.nikula@intel.com>
Date:   Tue Jul 30 12:20:32 2013 +0300

    drm/i915: move encoder->enable callback later in VLV crtc enable

v2: Rebase on the renamed enable hooks, adding clarity (Ville)

Reference: http://mid.gmane.org/CAKMK7uFs9EMvMW8BnS24e5UNm1D7JrfVg3SD5SDFtVEamGfOOg@mail.gmail.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_dp.c

@@ -1717,16 +1717,21 @@ static void intel_enable_dp(struct intel_encoder *encoder)
 	ironlake_edp_panel_vdd_off(intel_dp, true);
 	intel_dp_complete_link_train(intel_dp);
 	intel_dp_stop_link_train(intel_dp);
-	ironlake_edp_backlight_on(intel_dp);
 }
 
 static void g4x_enable_dp(struct intel_encoder *encoder)
 {
+	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
+
 	intel_enable_dp(encoder);
+	ironlake_edp_backlight_on(intel_dp);
 }
 
 static void vlv_enable_dp(struct intel_encoder *encoder)
 {
+	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
+
+	ironlake_edp_backlight_on(intel_dp);
 }
 
 static void g4x_pre_enable_dp(struct intel_encoder *encoder)