<itemizedlist>
<listitem>
DRM_PLANE_TYPE_PRIMARY represents a "main" plane for a CRTC. Primary
- planes are the planes operated upon by by CRTC modesetting and flipping
+ planes are the planes operated upon by CRTC modesetting and flipping
operations described in <xref linkend="drm-kms-crtcops"/>.
</listitem>
<listitem>
</sect2>
<sect2>
<title>Modeset Helper Functions Reference</title>
+!Iinclude/drm/drm_crtc_helper.h
!Edrivers/gpu/drm/drm_crtc_helper.c
!Pdrivers/gpu/drm/drm_crtc_helper.c overview
</sect2>