linux-kernel - Re: [PATCH v2 12/15] drm/mediatek: add callback function to return RDMA layer number

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Date:   Fri, 3 Aug 2018 13:13:22 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Stu Hsieh <stu.hsieh@...iatek.com>
CC:     Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <srv_heupstream@...iatek.com>
Subject: Re: [PATCH v2 12/15] drm/mediatek: add callback function to return
 RDMA layer number

Hi, Stu:

On Fri, 2018-08-03 at 11:11 +0800, Stu Hsieh wrote:
> This patch add callback function to return RDMA layer number
> 
> Signed-off-by: Stu Hsieh <stu.hsieh@...iatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_disp_rdma.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
> index b728f0f42611..8c145a87c9e5 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
> @@ -60,6 +60,7 @@
>  
>  struct mtk_disp_rdma_data {
>  	unsigned int fifo_size;
> +	unsigned int layer_nr;
>  };
>  
>  /**
> @@ -194,6 +195,13 @@ static unsigned int rdma_fmt_convert(struct mtk_disp_rdma *rdma,
>  	}
>  }
>  
> +static unsigned int mtk_rdma_layer_nr(struct mtk_ddp_comp *comp)
> +{
> +	struct mtk_disp_rdma *rdma = comp_to_rdma(comp);
> +
> +	return rdma->data->layer_nr;

Maybe RDMA always has one layer, so you could just return 1 here.

Regards,
CK

> +}
> +
>  static void mtk_rdma_layer_config(struct mtk_ddp_comp *comp, unsigned int idx,
>  				  struct mtk_plane_state *state)
>  {
> @@ -227,6 +235,7 @@ static const struct mtk_ddp_comp_funcs mtk_disp_rdma_funcs = {
>  	.stop = mtk_rdma_stop,
>  	.enable_vblank = mtk_rdma_enable_vblank,
>  	.disable_vblank = mtk_rdma_disable_vblank,
> +	.layer_nr = mtk_rdma_layer_nr,
>  	.layer_config = mtk_rdma_layer_config,
>  };
>  
> @@ -329,6 +338,7 @@ static const struct mtk_disp_rdma_data mt2701_rdma_driver_data = {
>  
>  static const struct mtk_disp_rdma_data mt8173_rdma_driver_data = {
>  	.fifo_size = SZ_8K,
> +	.layer_nr = 1,
>  };
>  
>  static const struct of_device_id mtk_disp_rdma_driver_dt_match[] = {