[PATCH 3/3] drm/vc4: Attach underscan props to the HDMI connector

[Boris Brezillon]

On Mon, 7 May 2018 17:24:08 +0200
Daniel Vetter <daniel at ffwll.ch> wrote:

> On Mon, May 07, 2018 at 04:44:34PM +0200, Boris Brezillon wrote:
> > Now that the plane code takes the underscan setup into account, we can
> > safely attach the underscan props to the HDMI connector.
> > 
> > We also take care of filling AVI infoframes correctly to expose the
> > top/botton/left/right bar.
> > 
> > Note that these underscan props match pretty well the
> > overscan_{left,right,top,bottom} properties defined in config.txt and
> > parsed by the VC4 firmware.
> > 
> > Signed-off-by: Boris Brezillon <boris.brezillon at bootlin.com>
> > ---
> >  drivers/gpu/drm/vc4/vc4_hdmi.c | 25 +++++++++++++++++++++++++
> >  1 file changed, 25 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
> > index 1a6db291d48b..17464b5981f9 100644
> > --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
> > +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
> > @@ -323,6 +323,16 @@ static struct drm_connector *vc4_hdmi_connector_init(struct drm_device *dev,
> >  			   DRM_MODE_CONNECTOR_HDMIA);
> >  	drm_connector_helper_add(connector, &vc4_hdmi_connector_helper_funcs);
> >  
> > +	/* The hborder and vborder limit is arbitrarily set to 1024 which
> > +	 * should be more than enough for real use cases. Note that the actual
> > +	 * limitation comes from the display mode:
> > +	 *	hborder < hdisplay && vborder < vdisplay
> > +	 */
> > +	drm_connector_attach_underscan_properties(connector,  
> 
> We should probably sprinkle __must_check over all these :-)

I'm perfectly fine adding __must_check to
drm_connector_attach_underscan_properties(), but I'm definitely not
volunteering for a massive __must_check sanitization :P.