On Sun, Jan 31, 2021 at 11:40 AM Chun-Kuang Hu <chunkuang.hu@xxxxxxxxxx> wrote: > > Hi, Hsin-Yi: > > Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx> 於 2021年1月29日 週五 下午5:23寫道: > > > > From: Yongqiang Niu <yongqiang.niu@xxxxxxxxxxxx> > > > > 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@xxxxxxxxxxxx> > > Signed-off-by: Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx> > > --- > > 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); > > + else > > + mtk_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/docs/MT6797_Register_Table_Part_2.pdf > > Regards, > Chun-Kuang. > Hi CK, I send the patch here: https://patchwork.kernel.org/project/linux-mediatek/patch/20210131051058.3407985-1-hsinyi@xxxxxxxxxxxx/ as others are already merged to the tree. Thanks > > } > > > > static void mtk_dither_start(struct device *dev) > > -- > > 2.30.0.365.g02bc693789-goog > > > > > > _______________________________________________ > > Linux-mediatek mailing list > > Linux-mediatek@xxxxxxxxxxxxxxxxxxx > > http://lists.infradead.org/mailman/listinfo/linux-mediatek