drm/mediatek: implement connection from BLS to DPI0

Modify display driver to support connection from BLS to DPI.
Signed-off-by: Bibby Hsieh <bibby.hsieh@mediatek.com>
Signed-off-by: CK Hu <ck.hu@mediatek.com>

drivers/gpu/drm/mediatek/mtk_drm_ddp.c

@@ -39,6 +39,7 @@
 #define DISP_REG_CONFIG_DISP_OVL_MOUT_EN	0x030
 #define DISP_REG_CONFIG_OUT_SEL			0x04c
 #define DISP_REG_CONFIG_DSI_SEL			0x050
+#define DISP_REG_CONFIG_DPI_SEL			0x064
 
 #define DISP_REG_MUTEX_EN(n)	(0x20 + 0x20 * (n))
 #define DISP_REG_MUTEX(n)	(0x24 + 0x20 * (n))
@@ -136,7 +137,10 @@
 
 #define OVL_MOUT_EN_RDMA		0x1
 #define BLS_TO_DSI_RDMA1_TO_DPI1	0x8
+#define BLS_TO_DPI_RDMA1_TO_DSI		0x2
 #define DSI_SEL_IN_BLS			0x0
+#define DPI_SEL_IN_BLS			0x0
+#define DSI_SEL_IN_RDMA			0x1
 
 struct mtk_disp_mutex {
 	int id;
@@ -339,9 +343,17 @@ static void mtk_ddp_sout_sel(void __iomem *config_regs,
 			     enum mtk_ddp_comp_id cur,
 			     enum mtk_ddp_comp_id next)
 {
-	if (cur == DDP_COMPONENT_BLS && next == DDP_COMPONENT_DSI0)
+	if (cur == DDP_COMPONENT_BLS && next == DDP_COMPONENT_DSI0) {
 		writel_relaxed(BLS_TO_DSI_RDMA1_TO_DPI1,
 			       config_regs + DISP_REG_CONFIG_OUT_SEL);
+	} else if (cur == DDP_COMPONENT_BLS && next == DDP_COMPONENT_DPI0) {
+		writel_relaxed(BLS_TO_DPI_RDMA1_TO_DSI,
+			       config_regs + DISP_REG_CONFIG_OUT_SEL);
+		writel_relaxed(DSI_SEL_IN_RDMA,
+			       config_regs + DISP_REG_CONFIG_DSI_SEL);
+		writel_relaxed(DPI_SEL_IN_BLS,
+			       config_regs + DISP_REG_CONFIG_DPI_SEL);
+	}
 }
 
 void mtk_ddp_add_comp_to_path(void __iomem *config_regs,