Re: [PATCH v2 2/3] Subject: [PATCH] drm/mediatek/dp: Add HDCP2.x feature for DisplayPort

[CK Hu (胡俊光)]

Hi, Mac:

On Mon, 2024-02-05 at 13:50 +0800, mac.shen wrote:
> Add HDCP2.x feature for DisplayPort.
> When userspace request the kernel protect future content communicated
> over the link with Content_Protection property, the feature will do
> HDCP2.x authentication if the sink support HDCP2.X.
> 
> Changes in v2:
> - remove switch case, and refine code to make more clear
> - remove some definitions, and use the definitions in
>   include/drm/drm_hdcp.h
> - use the struct which defined in include/drm/drm_hdcp.h
> - do HDCP2.x authentication when userspace request the
>   kernel protect future content communicated
> per suggestion from the previous thread:
> https://lore.kernel.org/all/8fff59b5567449d8201dd1138c8fa
> 9218a545c46.camel@xxxxxxxxxxxx/
> 
> Signed-off-by: mac.shen <mac.shen@xxxxxxxxxxxx>
> ---

[snip]

>  
> +void mtk_dp_check_hdcp_version(struct mtk_dp *mtk_dp, bool
> only_hdcp1x)
> +{
> +	if (!only_hdcp1x && dp_tx_hdcp2_support(&mtk_dp->hdcp_info))
> +		return;
> +
> +	if (tee_add_device(&mtk_dp->hdcp_info, HDCP_NONE) !=
> RET_SUCCESS)

Does this mean that if rx does not support hdcp, dp tx driver still
need to create tee device to work for no hdcp? If so, I think this
should be separated to an independent patch. I like the patch sequence
to be:

1. Support NO HDCP
2. Support HDCP 1x
3. Support HDCP 2x

Regards,
CK

> +		mtk_dp->hdcp_info.auth_status = AUTH_FAIL;
> +}
> +