+
+ void *addr = mmap(0, bo->total_size, prot, MAP_SHARED, bo->drv->fd, gem_map.offset);
+
+ data->length = bo->total_size;
+
+ if (bo->flags & BO_USE_RENDERSCRIPT) {
+ priv = calloc(1, sizeof(*priv));
+ priv->cached_addr = calloc(1, bo->total_size);
+ priv->gem_addr = addr;
+ memcpy(priv->cached_addr, priv->gem_addr, bo->total_size);
+ data->priv = priv;
+ addr = priv->cached_addr;
+ }
+
+ return addr;
+}
+
+static int mediatek_bo_unmap(struct bo *bo, struct map_info *data)
+{
+ if (data->priv) {
+ struct mediatek_private_map_data *priv = data->priv;
+ data->addr = priv->gem_addr;
+ free(priv->cached_addr);
+ free(priv);
+ data->priv = NULL;
+ }
+
+ return munmap(data->addr, data->length);
+}
+
+static int mediatek_bo_flush(struct bo *bo, struct map_info *data)
+{
+ struct mediatek_private_map_data *priv = data->priv;
+ if (priv)
+ memcpy(priv->gem_addr, priv->cached_addr, bo->total_size);
+
+ return 0;
+}
+
+static uint32_t mediatek_resolve_format(uint32_t format, uint64_t usage)
+{
+ switch (format) {
+ case DRM_FORMAT_FLEX_IMPLEMENTATION_DEFINED:
+ /*HACK: See b/28671744 */
+ return DRM_FORMAT_XBGR8888;
+ case DRM_FORMAT_FLEX_YCbCr_420_888:
+ return DRM_FORMAT_YVU420;
+ default:
+ return format;
+ }
+}
+
+struct backend backend_mediatek = {
+ .name = "mediatek",
+ .init = mediatek_init,
+ .bo_create = mediatek_bo_create,
+ .bo_destroy = drv_gem_bo_destroy,
+ .bo_import = drv_prime_bo_import,
+ .bo_map = mediatek_bo_map,
+ .bo_unmap = mediatek_bo_unmap,
+ .bo_flush = mediatek_bo_flush,
+ .resolve_format = mediatek_resolve_format,