[PATCH 1/3] drm: Add LCD display clock polarity flags

[linux@arm.linux.org.uk (Russell King - ARM Linux)]

On Tue, Dec 03, 2013 at 07:44:52PM +0800, Shawn Guo wrote:
> On Mon, Dec 02, 2013 at 04:39:26PM +0100, Marek Vasut wrote:
> > Add DRM flags for the LCD display clock polarity so the pixelclk-active DT
> > property can be properly handled by drivers using the DRM API.
> > 
> > Signed-off-by: Marek Vasut <marex@denx.de>
> > Cc: Dave Airlie <airlied@gmail.com>
> > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> > Cc: Philipp Zabel <p.zabel@pengutronix.de>
> > Cc: Sascha Hauer <s.hauer@pengutronix.de>
> > Cc: Shawn Guo <shawn.guo@linaro.org>
> > ---
> >  drivers/gpu/drm/drm_modes.c | 5 +++++
> >  include/uapi/drm/drm_mode.h | 3 +++
> >  2 files changed, 8 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
> > index 85071a1..d1f3bfc 100644
> > --- a/drivers/gpu/drm/drm_modes.c
> > +++ b/drivers/gpu/drm/drm_modes.c
> > @@ -537,6 +537,11 @@ int drm_display_mode_from_videomode(const struct videomode *vm,
> >  		dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
> >  	if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
> >  		dmode->flags |= DRM_MODE_FLAG_DBLCLK;
> > +	if (vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
> > +		dmode->flags |= DRM_MODE_FLAG_PIXELCLK_PPOL;
> > +	else if (vm->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
> > +		dmode->flags |= DRM_MODE_FLAG_PIXELCLK_NPOL;
> > +
> >  	drm_mode_set_name(dmode);
> >  
> >  	return 0;
> > diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
> > index f104c26..a6169ca 100644
> > --- a/include/uapi/drm/drm_mode.h
> > +++ b/include/uapi/drm/drm_mode.h
> > @@ -73,6 +73,9 @@
> >  #define  DRM_MODE_FLAG_3D_TOP_AND_BOTTOM	(7<<14)
> >  #define  DRM_MODE_FLAG_3D_SIDE_BY_SIDE_HALF	(8<<14)
> >  
> > +/* CRTC LCD clock polarity flags. */
> > +#define DRM_MODE_FLAG_PIXELCLK_PPOL		(1<<19)
> > +#define DRM_MODE_FLAG_PIXELCLK_NPOL		(1<<20)
> 
> Marek,
> 
> It looks that Denis (copied) is working on the same problem, so you may
> want to be aware of his effort [1][2].

Indeed, and I made very similar comments in that thread.