drm/mediatek: Add mtk_dither_set_common() function

Current implementation of mtk_dither_set() cast dev data to
struct mtk_ddp_comp_dev. But other devices with different dev data
would also call this function.

Separate necessary parameters out so other device components (dither,
gamma) can call this function.
Signed-off-by: NHsin-Yi Wang <hsinyi@chromium.org>
Reviewed-by: NCK Hu <ck.hu@mediatek.com>
Signed-off-by: NChun-Kuang Hu <chunkuang.hu@kernel.org>

drivers/gpu/drm/mediatek/mtk_disp_drv.h

@@ -17,6 +17,10 @@ void mtk_color_config(struct device *dev, unsigned int w,
 		      unsigned int bpc, struct cmdq_pkt *cmdq_pkt);
 void mtk_color_start(struct device *dev);
 
+void mtk_dither_set_common(void __iomem *regs, struct cmdq_client_reg *cmdq_reg,
+			   unsigned int bpc, unsigned int cfg,
+			   unsigned int dither_en, struct cmdq_pkt *cmdq_pkt);
+
 void mtk_dpi_start(struct device *dev);
 void mtk_dpi_stop(struct device *dev);
 

drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c

@@ -151,33 +151,42 @@ static void mtk_ddp_clk_disable(struct device *dev)
 	clk_disable_unprepare(priv->clk);
 }
 
-static void mtk_dither_set(struct device *dev, unsigned int bpc,
-		    unsigned int CFG, struct cmdq_pkt *cmdq_pkt)
-{
-	struct mtk_ddp_comp_dev *priv = dev_get_drvdata(dev);
 
+void mtk_dither_set_common(void __iomem *regs, struct cmdq_client_reg *cmdq_reg,
+			   unsigned int bpc, unsigned int cfg,
+			   unsigned int dither_en, struct cmdq_pkt *cmdq_pkt)
+{
 	/* If bpc equal to 0, the dithering function didn't be enabled */
 	if (bpc == 0)
 		return;
 
 	if (bpc >= MTK_MIN_BPC) {
-		mtk_ddp_write(cmdq_pkt, 0, &priv->cmdq_reg, priv->regs, DISP_DITHER_5);
-		mtk_ddp_write(cmdq_pkt, 0, &priv->cmdq_reg, priv->regs, DISP_DITHER_7);
+		mtk_ddp_write(cmdq_pkt, 0, cmdq_reg, regs, DISP_DITHER_5);
+		mtk_ddp_write(cmdq_pkt, 0, cmdq_reg, regs, DISP_DITHER_7);
 		mtk_ddp_write(cmdq_pkt,
 			      DITHER_LSB_ERR_SHIFT_R(MTK_MAX_BPC - bpc) |
 			      DITHER_ADD_LSHIFT_R(MTK_MAX_BPC - bpc) |
 			      DITHER_NEW_BIT_MODE,
-			      &priv->cmdq_reg, priv->regs, DISP_DITHER_15);
+			      cmdq_reg, regs, DISP_DITHER_15);
 		mtk_ddp_write(cmdq_pkt,
 			      DITHER_LSB_ERR_SHIFT_B(MTK_MAX_BPC - bpc) |
 			      DITHER_ADD_LSHIFT_B(MTK_MAX_BPC - bpc) |
 			      DITHER_LSB_ERR_SHIFT_G(MTK_MAX_BPC - bpc) |
 			      DITHER_ADD_LSHIFT_G(MTK_MAX_BPC - bpc),
-			      &priv->cmdq_reg, priv->regs, DISP_DITHER_16);
-		mtk_ddp_write(cmdq_pkt, DISP_DITHERING, &priv->cmdq_reg, priv->regs, CFG);
+			      cmdq_reg, regs, DISP_DITHER_16);
+		mtk_ddp_write(cmdq_pkt, dither_en, cmdq_reg, regs, cfg);
 	}
 }
 
+static void mtk_dither_set(struct device *dev, unsigned int bpc,
+		    unsigned int cfg, struct cmdq_pkt *cmdq_pkt)
+{
+	struct mtk_ddp_comp_dev *priv = dev_get_drvdata(dev);
+
+	mtk_dither_set_common(priv->regs, &priv->cmdq_reg, bpc, cfg,
+			      DISP_DITHERING, cmdq_pkt);
+}
+
 static void mtk_od_config(struct device *dev, unsigned int w,
 			  unsigned int h, unsigned int vrefresh,
 			  unsigned int bpc, struct cmdq_pkt *cmdq_pkt)