[PATCH v4 09/17] drm/uAPI: Add "active color range" drm property as feedback for userspace

Pekka Paalanen ppaalanen at gmail.com
Wed Jun 23 11:14:23 UTC 2021

On Wed, 23 Jun 2021 12:17:40 +0200
Werner Sembach <wse at tuxedocomputers.com> wrote:

> Am 23.06.21 um 09:32 schrieb Pekka Paalanen:
> > On Tue, 22 Jun 2021 11:48:52 +0000
> > Simon Ser <contact at emersion.fr> wrote:
> >  
> >> On Tuesday, June 22nd, 2021 at 11:50, Werner Sembach <wse at tuxedocomputers.com> wrote:
> >>  
> >>> Unknown is when no monitor is connected or is when the
> >>> connector/monitor is disabled.    
> >> I think the other connector props (link-status, non-desktop, etc) don't
> >> have a special "unset" value, and instead the value is set to a random
> >> enum entry. User-space should ignore the prop on these disconnected
> >> connectors anyways.  
> > That sounds fine to me.  
> Currently the only case for "not applicable" is when the monitor is
> disconnected, but sicne the properties are so interdependent, there
> might be a case in the future where e.g. a color format that has no
> differentiation between full and limited arises. When there is no
> special unset/not applicable option, the userspace has to know
> exactly when an option is valid or not, possible requiring additional
> logic.
> Setting a "not applicable" value allows userspace to be more dumb,
> without much hassle on the kernelspace side.

That's a good point too. So "not applicable" would be a value, but
"unknown" would not be.

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