[PATCH] drm/fourcc: Document open source user waiver

[Daniel Vetter]

Thanks for all the acks, added them all and applied the patch.
-Daniel

On Fri, Dec 02, 2022 at 02:14:03AM +0100, Bas Nieuwenhuizen wrote:
> Acked-by: Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl>
> 
> On Thu, Dec 1, 2022 at 8:47 PM Jason Ekstrand <jason at jlekstrand.net> wrote:
> >
> > Acked-by: Jason Ekstrand <jason.ekstrand at collabora.com>
> >
> > On Thu, Dec 1, 2022 at 4:22 AM Daniel Vetter <daniel.vetter at ffwll.ch> wrote:
> >>
> >> On Thu, 1 Dec 2022 at 11:07, Daniel Vetter <daniel at ffwll.ch> wrote:
> >> >
> >> > On Wed, Nov 23, 2022 at 08:24:37PM +0100, Daniel Vetter wrote:
> >> > > It's a bit a FAQ, and we really can't claim to be the authoritative
> >> > > source for allocating these numbers used in many standard extensions
> >> > > if we tell closed source or vendor stacks in general to go away.
> >> > >
> >> > > Iirc this was already clarified in some vulkan discussions, but I
> >> > > can't find that anywhere anymore. At least not in a public link.
> >> > >
> >> > > Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> >> > > Cc: Maxime Ripard <mripard at kernel.org>
> >> > > Cc: Thomas Zimmermann <tzimmermann at suse.de>
> >> > > Cc: David Airlie <airlied at gmail.com>
> >> > > Cc: Daniel Vetter <daniel at ffwll.ch>
> >> > > Cc: Alex Deucher <alexdeucher at gmail.com>
> >> > > Cc: Daniel Stone <daniel at fooishbar.org>
> >> > > Cc: Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl>
> >> > > Cc: Jason Ekstrand <jason at jlekstrand.net>
> >> > > Cc: Neil Trevett <ntrevett at nvidia.com>
> >> > > Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
> >> >
> >> > From irc:
> >> >
> >> > <airlied> danvet: ack from me
> >>
> >> Also from irc:
> >>
> >> <mareko> danvet: Acked
> >>
> >> -Daniel
> >>
> >> > > ---
> >> > >  include/uapi/drm/drm_fourcc.h | 12 ++++++++++++
> >> > >  1 file changed, 12 insertions(+)
> >> > >
> >> > > diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> >> > > index bc056f2d537d..de703c6be969 100644
> >> > > --- a/include/uapi/drm/drm_fourcc.h
> >> > > +++ b/include/uapi/drm/drm_fourcc.h
> >> > > @@ -88,6 +88,18 @@ extern "C" {
> >> > >   *
> >> > >   * The authoritative list of format modifier codes is found in
> >> > >   * `include/uapi/drm/drm_fourcc.h`
> >> > > + *
> >> > > + * Open Source User Waiver
> >> > > + * -----------------------
> >> > > + *
> >> > > + * Because this is the authoritative source for pixel formats and modifiers
> >> > > + * referenced by GL, Vulkan extensions and other standards and hence used both
> >> > > + * by open source and closed source driver stacks, the usual requirement for an
> >> > > + * upstream in-kernel or open source userspace user does not apply.
> >> > > + *
> >> > > + * To ensure, as much as feasible, compatibility across stacks and avoid
> >> > > + * confusion with incompatible enumerations stakeholders for all relevant driver
> >> > > + * stacks should approve additions.
> >> > >   */
> >> > >
> >> > >  #define fourcc_code(a, b, c, d) ((__u32)(a) | ((__u32)(b) << 8) | \
> >> > > --
> >> > > 2.37.2
> >> > >
> >> >
> >> > --
> >> > Daniel Vetter
> >> > Software Engineer, Intel Corporation
> >> > http://blog.ffwll.ch
> >>
> >>
> >>
> >> --
> >> Daniel Vetter
> >> Software Engineer, Intel Corporation
> >> http://blog.ffwll.ch

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