[PATCH] drm_fourcc: Document linear modifier

[Daniel Vetter]

On Tue, Dec 13, 2016 at 05:32:29AM +0000, Kristian Høgsberg wrote:
> Did we forget about this one? I guess I could commit it myself, but I'm not
> sure which branch to push it too...

Indeed this got lost, applied to drm-misc now.
-Daniel

> 
> Kristian
> 
> On Wed, Nov 9, 2016 at 4:10 PM Kristian Kristensen <hoegsberg at google.com>
> wrote:
> 
> > On Wed, Nov 9, 2016 at 4:36 AM, Daniel Vetter <daniel.vetter at ffwll.ch>
> > wrote:
> >
> > Not setting the fb modifiers flag is something different from setting
> > the fb modifiers to 0 (which means explicitly linear). We kinda failed
> > to document that properly. Spotted by Kristian.
> >
> > Cc: hoegsberg at google.com
> > Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> >
> >
> > Thanks, looks good.
> >
> > Reviewed-by: Kristian H. Kristensen <hoegsberg at google.com>
> >
> >
> > ---
> >  include/uapi/drm/drm_fourcc.h | 10 ++++++++++
> >  1 file changed, 10 insertions(+)
> >
> > diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> > index da49f69e4d7e..2fca7e1f6aab 100644
> > --- a/include/uapi/drm/drm_fourcc.h
> > +++ b/include/uapi/drm/drm_fourcc.h
> > @@ -172,6 +172,16 @@ extern "C" {
> >   * authoritative source for all of these.
> >   */
> >
> > +/*
> > + * Linear Layout
> > + *
> > + * Just plain linear layout. Note that this is different from no
> > specifying any
> > + * modifier (e.g. not setting DRM_MODE_FB_MODIFIERS in the DRM_ADDFB2
> > ioctl),
> > + * which tells the driver to also take driver-internal information into
> > account
> > + * and so might actually result in a tiled framebuffer.
> > + */
> > +#define DRM_FORMAT_MOD_LINEAR  fourcc_mod_code(NONE, 0)
> > +
> >  /* Intel framebuffer modifiers */
> >
> >  /*
> > --
> > 2.7.4
> >
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel at lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/dri-devel
> >

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch