Regressed by this commit:
commit 
3455454e18ca3f92c565700539e744c620d8276b
Author: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Date:   Tue Mar 3 15:21:56 2015 +0200
    drm/i915: Add a for_each_intel_connector macro
Cc: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Ander Conselvan de Oliveira <conselvan2@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
        u8 crc[6];
 
        drm_modeset_lock_all(dev);
-       for_each_intel_encoder(dev, connector) {
+       for_each_intel_connector(dev, connector) {
 
                if (connector->base.dpms != DRM_MODE_DPMS_ON)
                        continue;