Hi, Yongqiang:
Yongqiang Niu <yongqiang.niu@xxxxxxxxxxxx> 於 2020年8月20日 週四 下午2:18寫道：
>
> the shadow register for mt8192 ddp component is enable,
> we need disable it before enable ddp component
MT2701 has shadow register and use it. Why MT8192 have shadow register
but disable it? I would like to use shadow register like MT2701.
Regards,
Chun-Kuang.
>
> Signed-off-by: Yongqiang Niu <yongqiang.niu@xxxxxxxxxxxx>
> ---
> drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 3 +++
> drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 7 +++++++
> 2 files changed, 10 insertions(+)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index fe46c4b..16e9b88 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -299,6 +299,9 @@ static int mtk_crtc_ddp_hw_init(struct mtk_drm_crtc *mtk_crtc)
> goto err_mutex_unprepare;
> }
>
> + for (i = 0; i < mtk_crtc->ddp_comp_nr; i++)
> + mtk_ddp_comp_bypass_shadow(mtk_crtc->ddp_comp[i]);
> +
> DRM_DEBUG_DRIVER("mediatek_ddp_ddp_path_setup\n");
> for (i = 0; i < mtk_crtc->ddp_comp_nr - 1; i++) {
> mtk_mmsys_ddp_connect(mtk_crtc->mmsys_dev,
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> index ae11b46..1f25705 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> @@ -45,6 +45,7 @@ struct mtk_ddp_comp_funcs {
> unsigned int bpc, struct cmdq_pkt *cmdq_pkt);
> void (*start)(struct mtk_ddp_comp *comp);
> void (*stop)(struct mtk_ddp_comp *comp);
> + void (*bypass_shadow)(struct mtk_ddp_comp *comp);
> void (*enable_vblank)(struct mtk_ddp_comp *comp, struct drm_crtc *crtc);
> void (*disable_vblank)(struct mtk_ddp_comp *comp);
> unsigned int (*supported_rotations)(struct mtk_ddp_comp *comp);
> @@ -169,6 +170,12 @@ static inline void mtk_ddp_ctm_set(struct mtk_ddp_comp *comp,
> comp->funcs->ctm_set(comp, state);
> }
>
> +static inline void mtk_ddp_comp_bypass_shadow(struct mtk_ddp_comp *comp)
> +{
> + if (comp->funcs && comp->funcs->bypass_shadow)
> + comp->funcs->bypass_shadow(comp);
> +}
> +
> int mtk_ddp_comp_get_id(struct device_node *node,
> enum mtk_ddp_comp_type comp_type);
> int mtk_ddp_comp_init(struct device *dev, struct device_node *comp_node,
> --
> 1.8.1.1.dirty
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