@@ -47,6 +47,12 @@
 #define CCORR_RELAY_MODE			BIT(0)
 #define DISP_CCORR_SIZE				0x0030
 
+#define DISP_DITHER_EN				0x0000
+#define DITHER_EN				BIT(0)
+#define DISP_DITHER_CFG				0x0020
+#define DITHER_RELAY_MODE			BIT(0)
+#define DISP_DITHER_SIZE			0x0030
+
 #define DISP_GAMMA_EN				0x0000
 #define DISP_GAMMA_CFG				0x0020
 #define DISP_GAMMA_SIZE				0x0030

@@ -155,6 +161,24 @@ static void mtk_ccorr_stop(struct mtk_ddp_comp *comp)
 	writel_relaxed(0x0, comp->regs + DISP_CCORR_EN);
 }
 
+static void mtk_dither_config(struct mtk_ddp_comp *comp, unsigned int w,
+			      unsigned int h, unsigned int vrefresh,
+			      unsigned int bpc)
+{
+	writel(h << 16 | w, comp->regs + DISP_DITHER_SIZE);
+	writel(DITHER_RELAY_MODE, comp->regs + DISP_DITHER_CFG);
+}
+
+static void mtk_dither_start(struct mtk_ddp_comp *comp)
+{
+	writel(DITHER_EN, comp->regs + DISP_DITHER_EN);
+}
+
+static void mtk_dither_stop(struct mtk_ddp_comp *comp)
+{
+	writel_relaxed(0x0, comp->regs + DISP_DITHER_EN);
+}
+
 static void mtk_gamma_config(struct mtk_ddp_comp *comp, unsigned int w,
 			     unsigned int h, unsigned int vrefresh,
 			     unsigned int bpc)

@@ -209,6 +233,12 @@ static void mtk_gamma_set(struct mtk_ddp_comp *comp,
 	.stop = mtk_ccorr_stop,
 };
 
+static const struct mtk_ddp_comp_funcs ddp_dither = {
+	.config = mtk_dither_config,
+	.start = mtk_dither_start,
+	.stop = mtk_dither_stop,
+};
+
 static const struct mtk_ddp_comp_funcs ddp_gamma = {
 	.gamma_set = mtk_gamma_set,
 	.config = mtk_gamma_config,

@@ -234,6 +264,7 @@ static void mtk_gamma_set(struct mtk_ddp_comp *comp,
 	[MTK_DISP_CCORR] = "ccorr",
 	[MTK_DISP_AAL] = "aal",
 	[MTK_DISP_GAMMA] = "gamma",
+	[MTK_DISP_DITHER] = "dither",
 	[MTK_DISP_UFOE] = "ufoe",
 	[MTK_DSI] = "dsi",
 	[MTK_DPI] = "dpi",

@@ -256,6 +287,7 @@ struct mtk_ddp_comp_match {
 	[DDP_COMPONENT_CCORR]	= { MTK_DISP_CCORR,	0, &ddp_ccorr },
 	[DDP_COMPONENT_COLOR0]	= { MTK_DISP_COLOR,	0, NULL },
 	[DDP_COMPONENT_COLOR1]	= { MTK_DISP_COLOR,	1, NULL },
+	[DDP_COMPONENT_DITHER]	= { MTK_DISP_DITHER,	0, &ddp_dither },
 	[DDP_COMPONENT_DPI0]	= { MTK_DPI,		0, NULL },
 	[DDP_COMPONENT_DPI1]	= { MTK_DPI,		1, NULL },
 	[DDP_COMPONENT_DSI0]	= { MTK_DSI,		0, NULL },

@@ -30,6 +30,7 @@ enum mtk_ddp_comp_type {
 	MTK_DISP_WDMA,
 	MTK_DISP_COLOR,
 	MTK_DISP_CCORR,
+	MTK_DISP_DITHER,
 	MTK_DISP_AAL,
 	MTK_DISP_GAMMA,
 	MTK_DISP_UFOE,

@@ -49,6 +50,7 @@ enum mtk_ddp_comp_id {
 	DDP_COMPONENT_CCORR,
 	DDP_COMPONENT_COLOR0,
 	DDP_COMPONENT_COLOR1,
+	DDP_COMPONENT_DITHER,
 	DDP_COMPONENT_DPI0,
 	DDP_COMPONENT_DPI1,
 	DDP_COMPONENT_DSI0,