drm/i915: make sure we shut off the panel in eDP configs

commit 5620ae2 upstream.

Fix error from the last pull request.  Making sure we shut the panel off
is more correct and saves power.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/gpu/drm/i915/intel_dp.c

@@ -758,7 +758,7 @@ intel_dp_dpms(struct drm_encoder *encoder, int mode)
 			intel_dp_link_down(intel_encoder, dp_priv->DP);
 			if (IS_eDP(intel_encoder)) {
 				ironlake_edp_backlight_off(dev);
-				ironlake_edp_backlight_off(dev);
+				ironlake_edp_panel_off(dev);
 			}
 		}
 	} else {