[Intel-gfx] [PATCH 1/4] drm: add picture aspect ratio flags

[Daniel Vetter]

On Thu, Aug 04, 2016 at 03:46:09PM +0530, Sharma, Shashank wrote:
> Hello Emil,
> 
> Thanks for your time.
> 
> I have got mixed opinion on this.
> 
> IMHO we should expose them to userspace too, as UI agents like Hardware
> composer/X/Wayland must know what does these
> 
> flags means, so that they can display them on the end user screen (like
> settings menu)
> 
> But few people even think thats its too complex to be exposed to userspace
> agents.
> 
> So your suggestions are welcome.

These are flags for the internal mode representation, not for the uapi
one. They really don't belong into the uapi header, but instead into
include/drm/drm_modes.h. I.e. I fully concur with Emil.
-Daniel

> 
> Regards
> Shashank
> 
> On 8/4/2016 3:12 PM, Emil Velikov wrote:
> > On 3 August 2016 at 11:56, Shashank Sharma <shashank.sharma at intel.com> wrote:
> > 
> > > --- a/include/uapi/drm/drm_mode.h
> > > +++ b/include/uapi/drm/drm_mode.h
> > > +
> > > +/* Aspect ratio flag bitmask (4 bits 22:19) */
> > > +#define DRM_MODE_FLAG_PARMASK                  (0x0F<<19)
> > > +#define  DRM_MODE_FLAG_PARNONE \
> > > +                       (DRM_MODE_PICTURE_ASPECT_NONE << 19)
> > > +#define  DRM_MODE_FLAG_PAR4_3 \
> > > +                       (DRM_MODE_PICTURE_ASPECT_4_3 << 19)
> > > +#define  DRM_MODE_FLAG_PAR16_9 \
> > > +                       (DRM_MODE_PICTURE_ASPECT_16_9 << 19)
> > > 
> > Afaict all these flags are internal/implementation specific thus we
> > shouldn't expose them to userspace. Right ?
> > 
> > -Emil
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch