Hi,

> > So maybe a "enum plane_state" (instead of "bool is_enabled")?  So
> > we
> > can clearly disturgish ENABLED, DISABLED, NOT_SUPPORTED cases?
> 
> What's the difference between NOT_SUPPORTED and -ENOTTY on the ioctl?
> Perhaps a bit in a flags field could specify EN/DIS-ABLED and leave
> room for things we're forgetting.

So throw error in the NOT_SUPPORTED case, otherwise set/clear a
PLANE_ENABLED bit in flags?

Yep, that will work too.

cheers,
  Gerd

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