drm/mediatek: Add ovl_adaptor get format function

1. Add ovl_adaptor get_format and get_num_formats component function.
The two functions are needed for getting the supported format in
mtk_plane_init().
2. Get supported format from the ovl_adaptor's rdma engine - mdp_rdma.
Signed-off-by: Nancy.Lin <nancy.lin@mediatek.com>
Link: https://patchwork.kernel.org/project/linux-mediatek/patch/20230330032614.18837-3-nancy.lin@mediatek.com/Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

drivers/gpu/drm/mediatek/mtk_disp_drv.h

@@ -124,6 +124,8 @@ void mtk_ovl_adaptor_start(struct device *dev);
 void mtk_ovl_adaptor_stop(struct device *dev);
 unsigned int mtk_ovl_adaptor_layer_nr(struct device *dev);
 struct device *mtk_ovl_adaptor_dma_dev_get(struct device *dev);
+const u32 *mtk_ovl_adaptor_get_formats(struct device *dev);
+size_t mtk_ovl_adaptor_get_num_formats(struct device *dev);
 
 void mtk_rdma_bypass_shadow(struct device *dev);
 int mtk_rdma_clk_enable(struct device *dev);

drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c

@@ -297,6 +297,20 @@ void mtk_ovl_adaptor_disable_vblank(struct device *dev)
 	mtk_ethdr_disable_vblank(ovl_adaptor->ovl_adaptor_comp[OVL_ADAPTOR_ETHDR0]);
 }
 
+const u32 *mtk_ovl_adaptor_get_formats(struct device *dev)
+{
+	struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);
+
+	return mtk_mdp_rdma_get_formats(ovl_adaptor->ovl_adaptor_comp[OVL_ADAPTOR_MDP_RDMA0]);
+}
+
+size_t mtk_ovl_adaptor_get_num_formats(struct device *dev)
+{
+	struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);
+
+	return mtk_mdp_rdma_get_num_formats(ovl_adaptor->ovl_adaptor_comp[OVL_ADAPTOR_MDP_RDMA0]);
+}
+
 void mtk_ovl_adaptor_add_comp(struct device *dev, struct mtk_mutex *mutex)
 {
 	mtk_mutex_add_comp(mutex, DDP_COMPONENT_MDP_RDMA0);

drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c

@@ -410,6 +410,8 @@ static const struct mtk_ddp_comp_funcs ddp_ovl_adaptor = {
 	.disconnect = mtk_ovl_adaptor_disconnect,
 	.add = mtk_ovl_adaptor_add_comp,
 	.remove = mtk_ovl_adaptor_remove_comp,
+	.get_formats = mtk_ovl_adaptor_get_formats,
+	.get_num_formats = mtk_ovl_adaptor_get_num_formats,
 };
 
 static const char * const mtk_ddp_comp_stem[MTK_DDP_COMP_TYPE_MAX] = {