drm/i915: Generalize planes_{enabling,disabling}()

I want to use the same logic that planes_{enabling,disabling}()
are using for other features as well. Generlize the thing
into a pair of macros.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230320203352.19515-2-ville.syrjala@linux.intel.comReviewed-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>

drivers/gpu/drm/i915/display/intel_display.c

@@ -1069,20 +1069,28 @@ static bool needs_async_flip_vtd_wa(const struct intel_crtc_state *crtc_state)
 		(DISPLAY_VER(i915) == 9 || IS_BROADWELL(i915) || IS_HASWELL(i915));
 }
 
+#define is_enabling(feature, old_crtc_state, new_crtc_state) \
+	((!(old_crtc_state)->feature || intel_crtc_needs_modeset(new_crtc_state)) && \
+	 (new_crtc_state)->feature)
+#define is_disabling(feature, old_crtc_state, new_crtc_state) \
+	((old_crtc_state)->feature && \
+	 (!(new_crtc_state)->feature || intel_crtc_needs_modeset(new_crtc_state)))
+
 static bool planes_enabling(const struct intel_crtc_state *old_crtc_state,
 			    const struct intel_crtc_state *new_crtc_state)
 {
-	return (!old_crtc_state->active_planes || intel_crtc_needs_modeset(new_crtc_state)) &&
-		new_crtc_state->active_planes;
+	return is_enabling(active_planes, old_crtc_state, new_crtc_state);
 }
 
 static bool planes_disabling(const struct intel_crtc_state *old_crtc_state,
 			     const struct intel_crtc_state *new_crtc_state)
 {
-	return old_crtc_state->active_planes &&
-		(!new_crtc_state->active_planes || intel_crtc_needs_modeset(new_crtc_state));
+	return is_disabling(active_planes, old_crtc_state, new_crtc_state);
 }
 
+#undef is_disabling
+#undef is_enabling
+
 static void intel_post_plane_update(struct intel_atomic_state *state,
 				    struct intel_crtc *crtc)
 {