Re: [RESEND PATCH v6 15/20] drm/mediatek: Manage component's clock with function pointers

["CK Hu (胡俊光)" <ck.hu@mediatek.com>]

Hi, Hsiao-chien:

On Mon, 2023-09-11 at 15:42 +0800, Hsiao Chien Sung wrote:
> By registering component related functions to the pointers,
> we can easily manage them within a for-loop and simplify the
> logic of clock control significantly.

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

> 
> Signed-off-by: Hsiao Chien Sung <shawn.sung@mediatek.com>
> ---
>  .../gpu/drm/mediatek/mtk_disp_ovl_adaptor.c   | 111 +++++++---------
> --
>  1 file changed, 44 insertions(+), 67 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c
> b/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c
> index 8a52d1301e04..84133303a6ec 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c
> @@ -54,6 +54,7 @@ struct ovl_adaptor_comp_match {
>  	enum mtk_ovl_adaptor_comp_type type;
>  	enum mtk_ddp_comp_id comp_id;
>  	int alias_id;
> +	const struct mtk_ddp_comp_funcs *funcs;
>  };
> 
>  struct mtk_disp_ovl_adaptor {
> @@ -68,20 +69,35 @@ static const char * const
> private_comp_stem[OVL_ADAPTOR_TYPE_NUM] = {
>  	[OVL_ADAPTOR_TYPE_MERGE]	= "merge",
>  };
> 
> +static const struct mtk_ddp_comp_funcs _ethdr = {
> +	.clk_enable = mtk_ethdr_clk_enable,
> +	.clk_disable = mtk_ethdr_clk_disable,
> +};
> +
> +static const struct mtk_ddp_comp_funcs _merge = {
> +	.clk_enable = mtk_merge_clk_enable,
> +	.clk_disable = mtk_merge_clk_disable,
> +};
> +
> +static const struct mtk_ddp_comp_funcs _rdma = {
> +	.clk_enable = mtk_mdp_rdma_clk_enable,
> +	.clk_disable = mtk_mdp_rdma_clk_disable,
> +};
> +
>  static const struct ovl_adaptor_comp_match
> comp_matches[OVL_ADAPTOR_ID_MAX] = {
> -	[OVL_ADAPTOR_ETHDR0] = { OVL_ADAPTOR_TYPE_ETHDR,
> DDP_COMPONENT_ETHDR_MIXER, 0 },
> -	[OVL_ADAPTOR_MDP_RDMA0] = { OVL_ADAPTOR_TYPE_MDP_RDMA,
> DDP_COMPONENT_MDP_RDMA0, 0 },
> -	[OVL_ADAPTOR_MDP_RDMA1] = { OVL_ADAPTOR_TYPE_MDP_RDMA,
> DDP_COMPONENT_MDP_RDMA1, 1 },
> -	[OVL_ADAPTOR_MDP_RDMA2] = { OVL_ADAPTOR_TYPE_MDP_RDMA,
> DDP_COMPONENT_MDP_RDMA2, 2 },
> -	[OVL_ADAPTOR_MDP_RDMA3] = { OVL_ADAPTOR_TYPE_MDP_RDMA,
> DDP_COMPONENT_MDP_RDMA3, 3 },
> -	[OVL_ADAPTOR_MDP_RDMA4] = { OVL_ADAPTOR_TYPE_MDP_RDMA,
> DDP_COMPONENT_MDP_RDMA4, 4 },
> -	[OVL_ADAPTOR_MDP_RDMA5] = { OVL_ADAPTOR_TYPE_MDP_RDMA,
> DDP_COMPONENT_MDP_RDMA5, 5 },
> -	[OVL_ADAPTOR_MDP_RDMA6] = { OVL_ADAPTOR_TYPE_MDP_RDMA,
> DDP_COMPONENT_MDP_RDMA6, 6 },
> -	[OVL_ADAPTOR_MDP_RDMA7] = { OVL_ADAPTOR_TYPE_MDP_RDMA,
> DDP_COMPONENT_MDP_RDMA7, 7 },
> -	[OVL_ADAPTOR_MERGE0] = { OVL_ADAPTOR_TYPE_MERGE,
> DDP_COMPONENT_MERGE1, 1 },
> -	[OVL_ADAPTOR_MERGE1] = { OVL_ADAPTOR_TYPE_MERGE,
> DDP_COMPONENT_MERGE2, 2 },
> -	[OVL_ADAPTOR_MERGE2] = { OVL_ADAPTOR_TYPE_MERGE,
> DDP_COMPONENT_MERGE3, 3 },
> -	[OVL_ADAPTOR_MERGE3] = { OVL_ADAPTOR_TYPE_MERGE,
> DDP_COMPONENT_MERGE4, 4 },
> +	[OVL_ADAPTOR_ETHDR0] = { OVL_ADAPTOR_TYPE_ETHDR,
> DDP_COMPONENT_ETHDR_MIXER, 0, &_ethdr },
> +	[OVL_ADAPTOR_MDP_RDMA0] = { OVL_ADAPTOR_TYPE_MDP_RDMA,
> DDP_COMPONENT_MDP_RDMA0, 0, &_rdma },
> +	[OVL_ADAPTOR_MDP_RDMA1] = { OVL_ADAPTOR_TYPE_MDP_RDMA,
> DDP_COMPONENT_MDP_RDMA1, 1, &_rdma },
> +	[OVL_ADAPTOR_MDP_RDMA2] = { OVL_ADAPTOR_TYPE_MDP_RDMA,
> DDP_COMPONENT_MDP_RDMA2, 2, &_rdma },
> +	[OVL_ADAPTOR_MDP_RDMA3] = { OVL_ADAPTOR_TYPE_MDP_RDMA,
> DDP_COMPONENT_MDP_RDMA3, 3, &_rdma },
> +	[OVL_ADAPTOR_MDP_RDMA4] = { OVL_ADAPTOR_TYPE_MDP_RDMA,
> DDP_COMPONENT_MDP_RDMA4, 4, &_rdma },
> +	[OVL_ADAPTOR_MDP_RDMA5] = { OVL_ADAPTOR_TYPE_MDP_RDMA,
> DDP_COMPONENT_MDP_RDMA5, 5, &_rdma },
> +	[OVL_ADAPTOR_MDP_RDMA6] = { OVL_ADAPTOR_TYPE_MDP_RDMA,
> DDP_COMPONENT_MDP_RDMA6, 6, &_rdma },
> +	[OVL_ADAPTOR_MDP_RDMA7] = { OVL_ADAPTOR_TYPE_MDP_RDMA,
> DDP_COMPONENT_MDP_RDMA7, 7, &_rdma },
> +	[OVL_ADAPTOR_MERGE0] = { OVL_ADAPTOR_TYPE_MERGE,
> DDP_COMPONENT_MERGE1, 1, &_merge },
> +	[OVL_ADAPTOR_MERGE1] = { OVL_ADAPTOR_TYPE_MERGE,
> DDP_COMPONENT_MERGE2, 2, &_merge },
> +	[OVL_ADAPTOR_MERGE2] = { OVL_ADAPTOR_TYPE_MERGE,
> DDP_COMPONENT_MERGE3, 3, &_merge },
> +	[OVL_ADAPTOR_MERGE3] = { OVL_ADAPTOR_TYPE_MERGE,
> DDP_COMPONENT_MERGE4, 4, &_merge },
>  };
> 
>  void mtk_ovl_adaptor_layer_config(struct device *dev, unsigned int
> idx,
> @@ -187,73 +203,34 @@ void mtk_ovl_adaptor_stop(struct device *dev)
> 
>  int mtk_ovl_adaptor_clk_enable(struct device *dev)
>  {
> -	struct mtk_disp_ovl_adaptor *ovl_adaptor =
> dev_get_drvdata(dev);
> -	struct device *comp;
> -	int ret;
>  	int i;
> -
> -	for (i = 0; i < OVL_ADAPTOR_MERGE0; i++) {
> -		comp = ovl_adaptor->ovl_adaptor_comp[i];
> -		ret = pm_runtime_get_sync(comp);
> -		if (ret < 0) {
> -			dev_err(dev, "Failed to enable power domain %d,
> err %d\n", i, ret);
> -			goto pwr_err;
> -		}
> -	}
> +	int ret;
> +	struct mtk_disp_ovl_adaptor *ovl_adaptor =
> dev_get_drvdata(dev);
> 
>  	for (i = 0; i < OVL_ADAPTOR_ID_MAX; i++) {
> -		comp = ovl_adaptor->ovl_adaptor_comp[i];
> -
> -		if (i < OVL_ADAPTOR_MERGE0)
> -			ret = mtk_mdp_rdma_clk_enable(comp);
> -		else if (i < OVL_ADAPTOR_ETHDR0)
> -			ret = mtk_merge_clk_enable(comp);
> -		else
> -			ret = mtk_ethdr_clk_enable(comp);
> +		dev = ovl_adaptor->ovl_adaptor_comp[i];
> +		if (!dev)
> +			continue;
> +		ret = comp_matches[i].funcs->clk_enable(dev);
>  		if (ret) {
> -			dev_err(dev, "Failed to enable clock %d, err
> %d\n", i, ret);
> -			goto clk_err;
> +			while (--i >= 0)
> +				comp_matches[i].funcs-
> >clk_disable(dev);
> +			return ret;
>  		}
>  	}
> -
> -	return ret;
> -
> -clk_err:
> -	while (--i >= 0) {
> -		comp = ovl_adaptor->ovl_adaptor_comp[i];
> -		if (i < OVL_ADAPTOR_MERGE0)
> -			mtk_mdp_rdma_clk_disable(comp);
> -		else if (i < OVL_ADAPTOR_ETHDR0)
> -			mtk_merge_clk_disable(comp);
> -		else
> -			mtk_ethdr_clk_disable(comp);
> -	}
> -	i = OVL_ADAPTOR_MERGE0;
> -
> -pwr_err:
> -	while (--i >= 0)
> -		pm_runtime_put(ovl_adaptor->ovl_adaptor_comp[i]);
> -
> -	return ret;
> +	return 0;
>  }
> 
>  void mtk_ovl_adaptor_clk_disable(struct device *dev)
>  {
> -	struct mtk_disp_ovl_adaptor *ovl_adaptor =
> dev_get_drvdata(dev);
> -	struct device *comp;
>  	int i;
> +	struct mtk_disp_ovl_adaptor *ovl_adaptor =
> dev_get_drvdata(dev);
> 
>  	for (i = 0; i < OVL_ADAPTOR_ID_MAX; i++) {
> -		comp = ovl_adaptor->ovl_adaptor_comp[i];
> -
> -		if (i < OVL_ADAPTOR_MERGE0) {
> -			mtk_mdp_rdma_clk_disable(comp);
> -			pm_runtime_put(comp);
> -		} else if (i < OVL_ADAPTOR_ETHDR0) {
> -			mtk_merge_clk_disable(comp);
> -		} else {
> -			mtk_ethdr_clk_disable(comp);
> -		}
> +		dev = ovl_adaptor->ovl_adaptor_comp[i];
> +		if (!dev)
> +			continue;
> +		comp_matches[i].funcs->clk_disable(dev);
>  	}
>  }
> 
> --
> 2.18.0
>