[PATCH v3 9/9] drm/i915: Implement HDCP for DisplayPort

[Ramalingam C]

On Tuesday 05 December 2017 10:45 AM, Sean Paul wrote:
> +static
> +bool intel_dp_hdcp_check_link(struct intel_digital_port *intel_dig_port)
> +{
> +	ssize_t ret;
> +	u8 bstatus;
> +	ret = drm_dp_dpcd_read(&intel_dig_port->dp.aux, DP_AUX_HDCP_BSTATUS,
> +			       &bstatus, 1);
> +	if (ret != 1) {
> +		DRM_ERROR("Read bstatus from DP/AUX failed (%ld)\n", ret);
> +		return ret >= 0 ? -EIO : ret;
> +	}
> +	return !(bstatus & DP_BSTATUS_LINK_FAILURE);
> +}
as per link integrity check should cover other indication from the 
repeater like

REAUTHENTICATION_REQUEST - request for reauth due to unauthenticated 
state at downstream for some unknown reason

-Ram