On Mon, Feb 19, 2018 at 10:38:46PM +0200, Jyri Sarha wrote: > On 19/02/18 22:19, Ville Syrjälä wrote: > >>> +int drm_plane_create_color_properties(struct drm_plane *plane, > >>> + u32 supported_encodings, > >>> + u32 supported_ranges, > >> Is 0 in the above two supported_ masks a valid value? If yes, should we > >> still register the prop in that case? If no, please add a WARN_ON early > >> exit case to catch this. > > I guess if we go for that we should also check that the supported > > bitmasks don't contain undefined enum values, and that the default > > enum values are included in the bitmasks. > > > > Agreed. I wonder if there should still be check in > drm_property_create_enum() for empty enum list. I can not imagine any > good reason for having an enum property without valid options. It is > almost a contradiction in terms.
Yeah checking for that in the the core function sounds best. > > Jyri said he's not looked at this in a while, so I'll just go ahead > > and respin this myself. > > > > Thanks, please do. > > >> Similar, if there's only 1 possible value I guess we should make the prop > >> immutable? > > I wonder if we should put that logic into > > drm_property_create_enum() & co. actually? I could imagine that we end up with a property that generic userspace wants to set, but a driver somehow only wants to expose a single value (because there's one platform where random constraints result in that). Not quite a sure we should check for that too in the core, but I guess we can try and see what happens. -Daniel -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
