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<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]
> +
> +static int dp_tx_hdcp2x_write_ake_no_stored_km(struct mtk_hdcp_info *hdcp_info)
> +{
> +struct mtk_dp *mtk_dp = container_of(hdcp_info, struct mtk_dp, hdcp_info);
> +ssize_t ret;
> +
> +dev_dbg(mtk_dp->dev, "[HDCP2.X] HDCP_2_2_AKE_NO_STORED_KM\n");
> +
> +ret = drm_dp_dpcd_write(&mtk_dp->aux, DP_HDCP_2_2_AKE_NO_STORED_KM_OFFSET,
> +hdcp_info->hdcp2_info.hdcp_tx.no_stored_km.e_kpub_km,
> +HDCP_2_2_E_KPUB_KM_LEN);
> +if (ret < 0)
Directly return ret here.
> +return ret;
> +
> +return 0;
> +}
> +
> +static int dp_tx_hdcp2x_write_ake_stored_km(struct mtk_hdcp_info *hdcp_info)
> +{
> +struct mtk_dp *mtk_dp = container_of(hdcp_info, struct mtk_dp, hdcp_info);
> +ssize_t ret;
> +
> +dev_dbg(mtk_dp->dev, "[HDCP2.X] HDCP_2_2_AKE_STORED_KM\n");
> +
> +ret = drm_dp_dpcd_write(&mtk_dp->aux, DP_HDCP_2_2_AKE_STORED_KM_OFFSET,
> +hdcp_info->hdcp2_info.ake_stored_km.e_kh_km_m,
> +HDCP_2_2_E_KH_KM_LEN);
> +if (ret < 0)
> +return ret;
> +
> +ret = drm_dp_dpcd_write(&mtk_dp->aux, DP_HDCP_2_2_REG_M_OFFSET,
> +hdcp_info->hdcp2_info.ake_stored_km.e_kh_km_m +
> +HDCP_2_2_E_KH_KM_LEN,
> +HDCP_2_2_E_KH_KM_M_LEN - HDCP_2_2_E_KH_KM_LEN);
> +if (ret < 0)
Ditto.
Regards,
CK
> +return ret;
> +
> +return 0;
> +}
> +
</pre>
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