[PATCH v10 4/9] drm/mediatek: generalize mtk_dither_set() function

[Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx>]

There may be data structure other than mtk_ddp_comp_dev that would call
mtk_dither_set(), so use regs as parameter instead of device.

Signed-off-by: Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx>
---
 drivers/gpu/drm/mediatek/mtk_disp_drv.h     |  4 ++++
 drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 25 +++++++++++++--------
 2 files changed, 20 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
index 46d199b7b4a29..c50d5fc9fd349 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
+++ b/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,
+			   struct cmdq_pkt *cmdq_pkt);
+
 void mtk_dpi_start(struct device *dev);
 void mtk_dpi_stop(struct device *dev);
 
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
index 7b5293429426d..53d25823a37cc 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
@@ -151,33 +151,40 @@ 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, 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, DISP_DITHERING, 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, 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)
-- 
2.30.0.280.ga3ce27912f-goog