+ /* Nothing to do, although a sophisticated implementation might store
+ * the hint */
+
+ if (rsrc->layout == layout)
+ return;
+
+ /* We don't use the weight yet, but we should check that it's positive
+ * (semantically meaning that we should choose the given `layout`) */
+
+ if (weight <= 0)
+ return;
+
+ /* Check if the preferred layout is legal for this buffer */
+
+ if (layout == PAN_AFBC) {
+ bool can_afbc = panfrost_format_supports_afbc(rsrc->base.format);
+ bool is_scanout = rsrc->base.bind &
+ (PIPE_BIND_DISPLAY_TARGET | PIPE_BIND_SCANOUT | PIPE_BIND_SHARED);
+
+ if (!can_afbc || is_scanout)
+ return;
+ }
+
+ /* Simple heuristic so far: if the resource is uninitialized, switch to
+ * the hinted layout. If it is initialized, keep the original layout.
+ * This misses some cases where it would be beneficial to switch and
+ * blit. */
+
+ bool is_initialized = false;
+
+ for (unsigned i = 0; i < MAX_MIP_LEVELS; ++i)
+ is_initialized |= rsrc->slices[i].initialized;
+
+ if (is_initialized)
+ return;
+
+ /* We're uninitialized, so do a layout switch. Reinitialize slices. */
+
+ size_t new_size;
+ rsrc->layout = layout;
+ panfrost_setup_slices(rsrc, &new_size);
+
+ /* If we grew in size, reallocate the BO */
+ if (new_size > rsrc->bo->size) {
+ panfrost_drm_release_bo(screen, rsrc->bo, true);
+ rsrc->bo = panfrost_drm_create_bo(screen, new_size, PAN_ALLOCATE_DELAY_MMAP);
+ }