<html><body><p>
<pre>
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@mediatek.com/
>
> Signed-off-by: mac.shen <mac.shen@mediatek.com>
> ---
[snip]
> +/* Authentication flow starts from here */
> +static int dp_tx_hdcp2x_key_exchange(struct mtk_hdcp_info *hdcp_info)
> +{
> +struct mtk_dp *mtk_dp = container_of(hdcp_info, struct mtk_dp, hdcp_info);
> +bool stored;
> +int ret;
> +
> +if (!hdcp_info->hdcp2_info.capable)
> +return -EAGAIN;
> +
> +ret = dp_tx_hdcp2x_init(hdcp_info);
> +if (ret)
> +return ret;
> +
> +ret = dp_tx_hdcp2x_write_ake_init(hdcp_info);
> +if (ret)
> +return ret;
> +
> +ret = dp_tx_hdcp2x_read_ake_send_cert(hdcp_info);
> +if (ret)
> +return ret;
> +
> +hdcp_info->hdcp2_info.repeater =
> +HDCP_2_2_RX_REPEATER(hdcp_info->hdcp2_info.hdcp_rx.send_cert.rx_caps[2]);
> +
> +if (drm_hdcp_check_ksvs_revoked(mtk_dp->drm_dev,
> +hdcp_info->hdcp2_info.hdcp_rx.send_cert.cert_rx.receiver_id,
> +1) > 0) {
> +dev_err(mtk_dp->dev, "[HDCP2.X] Receiver ID is revoked\n");
> +return -EPERM;
> +}
> +
> +ret = tee_ake_certificate(hdcp_info,
> + (u8 *)&hdcp_info->hdcp2_info.hdcp_rx.cert_rx, &stored,
> +hdcp_info->hdcp2_info.ake_stored_km.e_kh_km_m +
> +HDCP_2_2_E_KH_KM_LEN,
> +hdcp_info->hdcp2_info.ake_stored_km.e_kh_km_m);
> +if (ret)
> +return ret;
> +
> +hdcp_info->hdcp2_info.stored_km = stored;
> +
> +if (!hdcp_info->hdcp2_info.stored_km) {
> +ret = tee_enc_rsaes_oaep(hdcp_info,
> + hdcp_info->hdcp2_info.hdcp_tx.no_stored_km.e_kpub_km);
> +if (ret)
> +return ret;
> +
> +ret = dp_tx_hdcp2x_write_ake_no_stored_km(hdcp_info);
> +if (ret)
> +return ret;
> +
> +} else {
> +ret = dp_tx_hdcp2x_write_ake_stored_km(hdcp_info);
> +if (ret)
> +return ret;
> +}
> +
> +ret = dp_tx_hdcp2x_read_ake_send_hprime(hdcp_info);
> +if (ret)
> +return ret;
> +
> +ret = tee_ake_h_prime(hdcp_info,
> + hdcp_info->hdcp2_info.hdcp_tx.ake_init.r_tx,
> +hdcp_info->hdcp2_info.hdcp_rx.send_cert.r_rx,
> +hdcp_info->hdcp2_info.hdcp_rx.send_cert.rx_caps,
> +(u8 *)&hdcp_info->hdcp2_info.hdcp_tx.tx_caps,
> +hdcp_info->hdcp2_info.hdcp_rx.send_hprime.h_prime,
> +HDCP_2_2_H_PRIME_LEN);
hdcp_info->hdcp2_info.hdcp_tx.ake_init,
hdcp_info->hdcp2_info.hdcp_rx.send_cert,
hdcp_info->hdcp2_info.hdcp_rx.send_hprime,
hdcp_info->hdcp2_info.hdcp_tx.no_stored_km,
hdcp_info->hdcp2_info.stored_km,
hdcp_info->hdcp2_info.hdcp_rx.pairing_info
are used only in dp_tx_hdcp2x_key_exchange(), so make them as local variable in dp_tx_hdcp2x_key_exchange().
hdcp_info->hdcp2_info.hdcp_tx.tx_caps is constant value, so use t_tx_caps[] directly instead of using hdcp_info->hdcp2_info.hdcp_tx.tx_caps.
Regards,
CK
> +if (ret) {
> +if (hdcp_info->hdcp2_info.stored_km)
> +tee_clear_paring(hdcp_info);
> +return ret;
> +}
> +
> +if (!hdcp_info->hdcp2_info.stored_km) {
> +ret = dp_tx_hdcp2x_read_ake_send_pairing_info(hdcp_info);
> +if (ret)
> +return ret;
> +
> +/* Store m, km, Ekh(km) */
> +ret = tee_ake_paring(hdcp_info,
> + hdcp_info->hdcp2_info.hdcp_rx.pairing_info.e_kh_km);
> +if (ret)
> +return ret;
> +}
> +
> +return 0;
> +}
> +
</pre>
</p></body></html><!--type:text--><!--{--><pre>************* MEDIATEK Confidentiality Notice
********************
The information contained in this e-mail message (including any
attachments) may be confidential, proprietary, privileged, or otherwise
exempt from disclosure under applicable laws. It is intended to be
conveyed only to the designated recipient(s). Any use, dissemination,
distribution, printing, retaining or copying of this e-mail (including its
attachments) by unintended recipient(s) is strictly prohibited and may
be unlawful. If you are not an intended recipient of this e-mail, or believe
that you have received this e-mail in error, please notify the sender
immediately (by replying to this e-mail), delete any and all copies of
this e-mail (including any attachments) from your system, and do not
disclose the content of this e-mail to any other person. Thank you!
</pre><!--}-->