This fixes a regression from
commit 
57779d06367a915ee03e6cb918d7575f0a46e419
Author: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date:   Wed Oct 31 17:50:14 2012 +0200
    drm/i915: Fix display pixel format handling
(which even says that they are supported on Ironlake, and then promptly
rejects then...)
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
 
        case DRM_FORMAT_UYVY:
        case DRM_FORMAT_YVYU:
        case DRM_FORMAT_VYUY:
-               if (INTEL_INFO(dev)->gen < 6)
+               if (INTEL_INFO(dev)->gen < 5)
                        return -EINVAL;
                break;
        default: