[PATCH v3 2/3] Subject: [PATCH] drm/mediatek/dp: Add HDCP2.x feature for DisplayPort

[CK Hu (胡俊光)]

Hi, Mac:

On Sat, 2024-06-08 at 20:01 +0800, mac.shen wrote:
> Changes in v3:
> - refine the function to get system time
> - refine the flow to do HDCP with content type and
>   protection value which set by user space
> - refine the flow to update content protection
> - refine the flow to do HDCP2.x authentication
> per suggestion from the previous thread:
> https://urldefense.com/v3/__https://patchwork.kernel.org/project/linux-mediatek__;!!CTRNKA9wMg0ARbw!md6xUiYN88D2YmETs8FQgaExM2zH8S1SmAEU9GRchwpNsXOyDFul3ziVKhRpCJaj8Rcn-gvM-801runjwA$ 
> /patch/20240205055055.25340-3-mac.shen at mediatek.com/
> 
> Signed-off-by: mac.shen <mac.shen at mediatek.com>
> ---

[snip]

> +
> +static int dp_tx_hdcp2x_init(struct mtk_hdcp_info *hdcp_info)
> +{
> +	int ret;
> +
> +	memset(&hdcp_info->hdcp2_info.hdcp_tx, 0, sizeof(struct hdcp2_info_tx));
> +	memset(&hdcp_info->hdcp2_info.hdcp_rx, 0, sizeof(struct hdcp2_info_rx));
> +	memset(&hdcp_info->hdcp2_info.ake_stored_km, 0, sizeof(struct hdcp2_ake_stored_km));
> +	memcpy(hdcp_info->hdcp2_info.hdcp_tx.ake_init.r_tx, t_rtx, HDCP_2_2_RTX_LEN);
> +	memcpy(&hdcp_info->hdcp2_info.hdcp_tx.tx_caps, t_tx_caps, HDCP_2_2_TXCAPS_LEN);
> +	memcpy(hdcp_info->hdcp2_info.hdcp_tx.lc_init.r_n, t_rn, HDCP_2_2_RN_LEN);
> +	memcpy(hdcp_info->hdcp2_info.hdcp_tx.send_eks.riv, t_riv, HDCP_2_2_RIV_LEN);
> +
> +	ret = dp_tx_hdcp2x_enable_auth(hdcp_info, false);

By default, auth is disabled. So this is redundant.

Regards,
CK

> +	if (ret)
> +		return ret;
> +
> +	return 0;
> +}
> +