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Subject[PATCH] drm/mediatek: enable dither function
Date
From: Yongqiang Niu <yongqiang.niu@mediatek.com>

Enable dither function to improve the display quality.

Signed-off-by: Yongqiang Niu <yongqiang.niu@mediatek.com>
Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
---
Previous version:
https://patchwork.kernel.org/project/linux-mediatek/patch/20210129092209.2584718-7-hsinyi@chromium.org/
---
drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
index c730029ac8fc7..0444b429daf00 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
@@ -53,6 +53,7 @@
#define DITHER_EN BIT(0)
#define DISP_DITHER_CFG 0x0020
#define DITHER_RELAY_MODE BIT(0)
+#define DITHER_ENGINE_EN BIT(1)
#define DISP_DITHER_SIZE 0x0030

#define LUT_10BIT_MASK 0x03ff
@@ -315,8 +316,12 @@ static void mtk_dither_config(struct device *dev, unsigned int w,
{
struct mtk_ddp_comp_dev *priv = dev_get_drvdata(dev);

- mtk_ddp_write(cmdq_pkt, h << 16 | w, &priv->cmdq_reg, priv->regs, DISP_DITHER_SIZE);
- mtk_ddp_write(cmdq_pkt, DITHER_RELAY_MODE, &priv->cmdq_reg, priv->regs, DISP_DITHER_CFG);
+ mtk_ddp_write(cmdq_pkt, h << 16 | w, &priv->cmdq_reg, priv->regs,
+ DISP_DITHER_SIZE);
+ mtk_ddp_write(cmdq_pkt, DITHER_RELAY_MODE, &priv->cmdq_reg, priv->regs,
+ DISP_DITHER_CFG);
+ mtk_dither_set_common(priv->regs, &priv->cmdq_reg, bpc, DISP_DITHER_CFG,
+ DITHER_ENGINE_EN, cmdq_pkt);
}

static void mtk_dither_start(struct device *dev)
--
2.30.0.365.g02bc693789-goog
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