linux-kernel - Re: [PATCH v2 1/3] Subject: [PATCH] drm/mediatek/dp: Add tee client application for HDCP feature

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Message-ID: <e06c53745d18eb2b275e677e61cbd258b96f7ebf.camel@mediatek.com>
Date: Tue, 20 Feb 2024 07:53:56 +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 v2 1/3] Subject: [PATCH] drm/mediatek/dp: Add tee client
 application for HDCP feature

Hi, Mac:

On Mon, 2024-02-05 at 13:50 +0800, mac.shen wrote:
> Add tee client application which will be used for
> HDCP 1.x and 2.x authentication in DisplayPort.
> 
> Changes in v2:
> - remove ca folder, and change file name with lower case
> - refine the tci_t structure to make the data to tee can
>   through this structure
> - remove aux and regs from mtk_hdcp_info structure
> - remove some definitions, and use the definitions in
>   include/drm/drm_hdcp.h
> - remove useless code
> per suggestion from the previous thread:
> https://lore.kernel.org/all/8fff59b5567449d8201dd1138c8fa
> 9218a545c46.camel@...iatek.com/
> 
> Signed-off-by: mac.shen <mac.shen@...iatek.com>
> ---

[snip]

> +
> +struct hdcp2_handler {
> +	u8 main_state;
> +	u8 sub_state;
> +	u8 down_stream_dev_cnt;

Useless, drop it.

> +	u8 hdcp_rx_ver;

Ditto.

> +	bool send_ake_init:1;

You set send_ake_init to ture, but never check it, so it's useless,
drop it.

> +	bool get_recv_id_list:1;

Useless, drop it.

> +	bool stored_km:1;
> +	bool send_lc_init:1;

You set send_lc_init to ture, but never check it, so it's useless, drop
it.

> +	bool send_ack:1;

Useless, drop it.

> +	bool sink_is_repeater:1;

Ditto.

> +	bool recv_msg:1;
> +	bool send_pair:1;

You set send_pair to ture, but never check it, so it's useless, drop
it.

Regards,
CK

> +	u32 seq_num_v_cnt;
> +	u32 retry_cnt;
> +};
> +