linux-kernel - Re: [PATCH v3 8/8] drm/mediatek: add third ddp path

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Date:   Fri, 25 May 2018 13:00:25 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     <stu.hsieh@...iatek.com>
CC:     Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <dri-devel@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <srv_heupstream@...iatek.com>
Subject: Re: [PATCH v3 8/8] drm/mediatek: add third ddp path

Hi, Stu:

On Fri, 2018-05-25 at 10:34 +0800, stu.hsieh@...iatek.com wrote:
> From: Stu Hsieh <stu.hsieh@...iatek.com>
> 
> This patch create third crtc by third ddp path
> 

Apply this patch before the patch 'Add support for mediatek SOC MT2712'
because this patch is necessary for mt2712.

> Signed-off-by: Stu Hsieh <stu.hsieh@...iatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_drv.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> index b32c4cc8d051..3a866e1d6af4 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -267,6 +267,11 @@ static int mtk_drm_kms_init(struct drm_device *drm)
>  	if (ret < 0)
>  		goto err_component_unbind;
>  
> +	ret = mtk_drm_crtc_create(drm, private->data->third_path,
> +				  private->data->third_len);

I think you should prevent doing this for mt8173 and mt2701 because that
two SoC has only two ddp path.

Regards,
CK

> +	if (ret < 0)
> +		goto err_component_unbind;
> +
>  	/* Use OVL device for all DMA memory allocations */
>  	np = private->comp_node[private->data->main_path[0]] ?:
>  	     private->comp_node[private->data->ext_path[0]];