Hi, Hsin-Yi:
Hsin-Yi Wang hsinyi@chromium.org 於 2021年1月29日 週五 下午5:23寫道：
From: Yongqiang Niu yongqiang.niu@mediatek.com
Enable dither function to improve the display quality for dither supported bpc 4, 6, 8. For not supported bpc, use relay mode.
Signed-off-by: Yongqiang Niu yongqiang.niu@mediatek.com Signed-off-by: Hsin-Yi Wang hsinyi@chromium.org
drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c index ac2cb25620357..5761dd15eedf2 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 @@ -314,9 +315,17 @@ static void mtk_dither_config(struct device *dev, unsigned int w, unsigned int bpc, struct cmdq_pkt *cmdq_pkt) { 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);
bool valid_bpc = (bpc == 4 || bpc == 6 || bpc == 8);mtk_ddp_write(cmdq_pkt, h << 16 | w, &priv->cmdq_reg, priv->regs,DISP_DITHER_SIZE);if (valid_bpc)mtk_dither_set_common(priv->regs, &priv->cmdq_reg, bpc,DISP_DITHER_CFG, DITHER_ENGINE_EN,cmdq_pkt);elsemtk_ddp_write(cmdq_pkt, DITHER_RELAY_MODE, &priv->cmdq_reg,priv->regs, DISP_DITHER_CFG);
od has relay mode,
static void mtk_od_config(struct mtk_ddp_comp *comp, unsigned int w, unsigned int h, unsigned int vrefresh, unsigned int bpc, struct cmdq_pkt *cmdq_pkt) { mtk_ddp_write(cmdq_pkt, w << 16 | h, comp, DISP_OD_SIZE); mtk_ddp_write(cmdq_pkt, OD_RELAYMODE, comp, DISP_OD_CFG); mtk_dither_set(comp, bpc, DISP_OD_CFG, cmdq_pkt); }
and it does not check valid bpc (I think drm core already set bpc to 4, 6, 8 or 0), so align implementation of mtk_dither_config() with mtk_od_config(). gamma also has relay mode (refer to [1] page 689), but we need to enable gamma's gamma function, so we do not set gamma to relay mode. So I think maybe we could implement mtk_dither_config() as:
mtk_dither_config() { 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); }
[1] https://www.96boards.org/documentation/consumer/mediatekx20/additional-docs/...
Regards, Chun-Kuang.
}
static void mtk_dither_start(struct device *dev)
2.30.0.365.g02bc693789-goog
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