linux-kernel - Re: [PATCH] drm/mediatek/dp: Add the HDCP feature for DisplayPort

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Date: Fri, 5 Jan 2024 06:10:20 +0000
From: CK Hu (胡俊光) <ck.hu@...iatek.com>
To: Mac Shen (沈俊) <Mac.Shen@...iatek.com>,
	"chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>,
	Jitao Shi (石记涛) <jitao.shi@...iatek.com>,
	"daniel@...ll.ch" <daniel@...ll.ch>, "p.zabel@...gutronix.de"
	<p.zabel@...gutronix.de>, "airlied@...il.com" <airlied@...il.com>,
	"matthias.bgg@...il.com" <matthias.bgg@...il.com>,
	"angelogioacchino.delregno@...labora.com"
	<angelogioacchino.delregno@...labora.com>
CC: "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>,
	Shuijing Li (李水静) <Shuijing.Li@...iatek.com>
Subject: Re: [PATCH] drm/mediatek/dp: Add the HDCP feature for DisplayPort

Hi, Mac:

On Fri, 2023-11-24 at 16:53 +0800, mac.shen wrote:
> Add tee client application, HDCP 1.x and 2.x authentication for
> DisplayPort
> to support the HDCP feature.
> 
> Signed-off-by: mac.shen <mac.shen@...iatek.com>
> ---

[snip]

>  
> @@ -2271,7 +2324,7 @@ static void mtk_dp_bridge_atomic_enable(struct
> drm_bridge *bridge,
>  
>  	mtk_dp->enabled = true;
>  	mtk_dp_update_plugged_status(mtk_dp);
> -
> +	mtk_dp_re_authentication(&mtk_dp->hdcp_info);

According to intel HDCP flow [1], I think you should enable HDCP
according to the connector status set by user space.

[1] 
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/drivers/gpu/drm/i915/display/intel_hdcp.c?h=next-20240104#n2413

Regards,
CK

>  	return;
>  power_off_aux:
>  	mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
>