<pre>
This patch add component DITHER

Signed-off-by: Yongqiang Niu <yongqiang.niu@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 32 +++++++++++++++++++++++++++++
 drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h |  2 ++
 2 files changed, 34 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
index 63f4b1e..a97e27b 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
@@ -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,
@@ -233,6 +263,7 @@ 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",
@@ -255,6 +286,7 @@ 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 },
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
index 6905647..b0064c52 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
@@ -29,6 +29,7 @@ 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,
@@ -48,6 +49,7 @@ 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,
-- 
1.8.1.1.dirty

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