[PATCH v12 19/23] drm/mediatek: add dma dev get function

[CK Hu]

Hi, Nancy:

On Tue, 2022-02-22 at 18:07 +0800, Nancy.Lin wrote:
> This is a preparation for adding support for the ovl_adaptor sub
> driver
> Ovl_adaptor is a DRM sub driver, which doesn't have dma dev. Add
> dma_dev_get function for getting representative dma dev in
> ovl_adaptor.

Reviewed-by: CK Hu <ck.hu at mediatek.com>

> 
> Signed-off-by: Nancy.Lin <nancy.lin at mediatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_crtc.c     | 15 +++++++++++++++
>  drivers/gpu/drm/mediatek/mtk_drm_crtc.h     |  1 +
>  drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h |  8 ++++++++
>  3 files changed, 24 insertions(+)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index d661edf7e0fe..77af71ad65f8 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -59,6 +59,7 @@ struct mtk_drm_crtc {
>  #endif
>  
>  	struct device			*mmsys_dev;
> +	struct device			*dma_dev;
>  	struct mtk_mutex		*mutex;
>  	unsigned int			ddp_comp_nr;
>  	struct mtk_ddp_comp		**ddp_comp;
> @@ -846,6 +847,13 @@ static int mtk_drm_crtc_init_comp_planes(struct
> drm_device *drm_dev,
>  	return 0;
>  }
>  
> +struct device *mtk_drm_crtc_dma_dev_get(struct drm_crtc *crtc)
> +{
> +	struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
> +
> +	return mtk_crtc->dma_dev;
> +}
> +
>  int mtk_drm_crtc_create(struct drm_device *drm_dev,
>  			const enum mtk_ddp_comp_id *path, unsigned int
> path_len)
>  {
> @@ -931,6 +939,13 @@ int mtk_drm_crtc_create(struct drm_device
> *drm_dev,
>  			return ret;
>  	}
>  
> +	/*
> +	 * Default to use the first component as the dma dev.
> +	 * In the case of ovl_adaptor sub driver, it needs to use the
> +	 * dma_dev_get function to get representative dma dev.
> +	 */
> +	mtk_crtc->dma_dev = mtk_ddp_comp_dma_dev_get(&priv-
> >ddp_comp[path[0]]);
> +
>  	ret = mtk_drm_crtc_init(drm_dev, mtk_crtc, pipe);
>  	if (ret < 0)
>  		return ret;
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
> b/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
> index cb9a36c48d4f..f5a6e80c5265 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
> @@ -22,5 +22,6 @@ int mtk_drm_crtc_plane_check(struct drm_crtc *crtc,
> struct drm_plane *plane,
>  			     struct mtk_plane_state *state);
>  void mtk_drm_crtc_async_update(struct drm_crtc *crtc, struct
> drm_plane *plane,
>  			       struct drm_atomic_state *plane_state);
> +struct device *mtk_drm_crtc_dma_dev_get(struct drm_crtc *crtc);
>  
>  #endif /* MTK_DRM_CRTC_H */
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> index 221e2e3a3c8d..4f7fae41c916 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> @@ -68,6 +68,7 @@ struct mtk_ddp_comp_funcs {
>  	void (*bgclr_in_off)(struct device *dev);
>  	void (*ctm_set)(struct device *dev,
>  			struct drm_crtc_state *state);
> +	struct device * (*dma_dev_get)(struct device *dev);
>  };
>  
>  struct mtk_ddp_comp {
> @@ -188,6 +189,13 @@ static inline void mtk_ddp_ctm_set(struct
> mtk_ddp_comp *comp,
>  		comp->funcs->ctm_set(comp->dev, state);
>  }
>  
> +static inline struct device *mtk_ddp_comp_dma_dev_get(struct
> mtk_ddp_comp *comp)
> +{
> +	if (comp->funcs && comp->funcs->dma_dev_get)
> +		return comp->funcs->dma_dev_get(comp->dev);
> +	return comp->dev;
> +}
> +
>  int mtk_ddp_comp_get_id(struct device_node *node,
>  			enum mtk_ddp_comp_type comp_type);
>  unsigned int mtk_drm_find_possible_crtc_by_comp(struct drm_device
> *drm,