On Fri, Sep 6, 2019 at 4:45 PM Daniel Vetter <daniel.vetter@xxxxxxxx> wrote: > > We forgot that. > > Proof is the one igt testcase we have: > > https://gitlab.freedesktop.org/drm/igt-gpu-tools/blob/master/tests/kms_atomic.c#L280 > > While at it also document that we have immutable zpos properties in > some cases. > > Reported-by: Pekka Paalanen <pekka.paalanen@xxxxxxxxxxxxx> > Cc: Pekka Paalanen <pekka.paalanen@xxxxxxxxxxxxx> > Reviewed-by: Pekka Paalanen <pekka.paalanen@xxxxxxxxxxxxx> > Cc: Ilia Mirkin <imirkin@xxxxxxxxxxxx> > Acked-by: Ilia Mirkin <imirkin@xxxxxxxxxxxx> > Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx> >From irc: Reviewed-by: Daniel Stone <daniels@xxxxxxxxxxxxx> > --- > drivers/gpu/drm/drm_blend.c | 7 ++++++- > 1 file changed, 6 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/drm_blend.c b/drivers/gpu/drm/drm_blend.c > index 37ac168fcb60..d02709dd2d4a 100644 > --- a/drivers/gpu/drm/drm_blend.c > +++ b/drivers/gpu/drm/drm_blend.c > @@ -130,7 +130,12 @@ > * Z position is set up with drm_plane_create_zpos_immutable_property() and > * drm_plane_create_zpos_property(). It controls the visibility of overlapping > * planes. Without this property the primary plane is always below the cursor > - * plane, and ordering between all other planes is undefined. > + * plane, and ordering between all other planes is undefined. The positive > + * Z axis points towards the user, i.e. planes with lower Z position values > + * are underneath planes with higher Z position values. Note that the Z > + * position value can also be immutable, to inform userspace about the > + * hard-coded stacking of overlay planes, see > + * drm_plane_create_zpos_immutable_property(). > * > * pixel blend mode: > * Pixel blend mode is set up with drm_plane_create_blend_mode_property(). > -- > 2.23.0 > -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
