Hi Dmitry, On Thu, 11 Jun 2020 at 08:54, Dmitry Osipenko <[email protected]> wrote: > 10.06.2020 14:30, Thierry Reding пишет: > > From: Thierry Reding <[email protected]> > > As of commit 4dc55525b095 ("drm: plane: Verify that no or all planes > > have a zpos property") a warning is emitted if there's a mix of planes > > with and without a zpos property. > > What problem does it solve?
Well, it fixes the WARN_ON, which asserts that either no planes have the zpos property attached, or all planes have the zpos property attached. When only _some_ planes have the property, the property is pretty much useless: zpos exists to guarantee to userspace the relative ordering between planes, defined by the value of the property. If not all planes have the property, then userspace cannot reason about the ordering, since some of the planes have undefined ordering. Cheers, Daniel _______________________________________________ dri-devel mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/dri-devel
