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

[Jason Ekstrand]

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
>
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