On 2018-03-06 10:10 PM, Shirish S wrote: > Add reverse iterator for_each_oldnew_plane_in_state_reverse to > compliment the for_each_oldnew_plane_in_state way or reading plane > states. > > The plane states are required to be read in reverse order for > amd drivers, cause the z order convention followed in linux is > opposite to how the planes are supposed to be presented to DC > engine, which is in common to both windows and linux. > > V2: fix compile time errors due to -Werror flag. > > Signed-off-by: Shirish S <shirish.s at amd.com> > Signed-off-by: Pratik Vishwakarma <Pratik.Vishwakarma at amd.com> > Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch> Merged to drm-misc-next. Harry > --- > include/drm/drm_atomic.h | 22 ++++++++++++++++++++++ > 1 file changed, 22 insertions(+) > > diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h > index cf13842..3fe8dde 100644 > --- a/include/drm/drm_atomic.h > +++ b/include/drm/drm_atomic.h > @@ -754,6 +754,28 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p); > (new_plane_state) = (__state)->planes[__i].new_state, 1)) > > /** > + * for_each_oldnew_plane_in_state_reverse - iterate over all planes in an atomic > + * update in reverse order > + * @__state: &struct drm_atomic_state pointer > + * @plane: &struct drm_plane iteration cursor > + * @old_plane_state: &struct drm_plane_state iteration cursor for the old state > + * @new_plane_state: &struct drm_plane_state iteration cursor for the new state > + * @__i: int iteration cursor, for macro-internal use > + * > + * This iterates over all planes in an atomic update in reverse order, > + * tracking both old and new state. This is useful in places where the > + * state delta needs to be considered, for example in atomic check functions. > + */ > +#define for_each_oldnew_plane_in_state_reverse(__state, plane, old_plane_state, new_plane_state, __i) \ > + for ((__i) = ((__state)->dev->mode_config.num_total_plane - 1); \ > + (__i) >= 0; \ > + (__i)--) \ > + for_each_if ((__state)->planes[__i].ptr && \ > + ((plane) = (__state)->planes[__i].ptr, \ > + (old_plane_state) = (__state)->planes[__i].old_state,\ > + (new_plane_state) = (__state)->planes[__i].new_state, 1)) > + > +/** > * for_each_old_plane_in_state - iterate over all planes in an atomic update > * @__state: &struct drm_atomic_state pointer > * @plane: &struct drm_plane iteration cursor >
