[PATCH v3 16/16] drm/i915/hdcp: Enable HDCP 2.2 MST support

[Shankar, Uma]

> -----Original Message-----
> From: Anshuman Gupta <anshuman.gupta at intel.com>
> Sent: Friday, October 23, 2020 5:51 PM
> To: intel-gfx at lists.freedesktop.org; dri-devel at lists.freedesktop.org
> Cc: seanpaul at chromium.org; Nikula, Jani <jani.nikula at intel.com>; C,
> Ramalingam <ramalingam.c at intel.com>; Li, Juston <juston.li at intel.com>;
> Shankar, Uma <uma.shankar at intel.com>; Gupta, Anshuman
> <anshuman.gupta at intel.com>
> Subject: [PATCH v3 16/16] drm/i915/hdcp: Enable HDCP 2.2 MST support
> 
> Enable HDCP 2.2 over DP MST.

Looks Good to me.
Reviewed-by: Uma Shankar <uma.shankar at intel.com>

> Cc: Ramalingam C <ramalingam.c at intel.com>
> Signed-off-by: Anshuman Gupta <anshuman.gupta at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_hdcp.c | 46 ++++++++++++++++++++++-
>  1 file changed, 44 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c
> b/drivers/gpu/drm/i915/display/intel_hdcp.c
> index 9dd08e2636e9..621c1a94c5ad 100644
> --- a/drivers/gpu/drm/i915/display/intel_hdcp.c
> +++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
> @@ -1698,6 +1698,32 @@ static int hdcp2_authenticate_sink(struct
> intel_connector *connector)
>  	return ret;
>  }
> 
> +static int hdcp2_enable_stream_encryption(struct intel_connector
> +*connector) {
> +	struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
> +	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> +	struct intel_hdcp *hdcp = &connector->hdcp;
> +	enum transcoder cpu_transcoder = hdcp->cpu_transcoder;
> +	enum port port = dig_port->base.port;
> +	int ret = 0;
> +
> +	if (!(intel_de_read(dev_priv, HDCP2_STATUS(dev_priv, cpu_transcoder,
> port)) &
> +			    LINK_ENCRYPTION_STATUS)) {
> +		drm_err(&dev_priv->drm, "HDCP 2.2 Link is not encrypted\n");
> +		return -EPERM;
> +	}
> +
> +	if (hdcp->shim->stream_2_2_encryption) {
> +		ret = hdcp->shim->stream_2_2_encryption(dig_port, true);
> +		if (ret) {
> +			drm_err(&dev_priv->drm, "Failed to enable HDCP 2.2
> stream enc\n");
> +			return ret;
> +		}
> +	}
> +
> +	return ret;
> +}
> +
>  static int hdcp2_enable_encryption(struct intel_connector *connector)  {
>  	struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
> @@ -1836,7 +1862,7 @@ static int hdcp2_authenticate_and_encrypt(struct
> intel_connector *connector)
>  			drm_dbg_kms(&i915->drm, "Port deauth failed.\n");
>  	}
> 
> -	if (!ret) {
> +	if (!ret && !dig_port->port_auth) {
>  		/*
>  		 * Ensuring the required 200mSec min time interval between
>  		 * Session Key Exchange and encryption.
> @@ -1851,6 +1877,8 @@ static int hdcp2_authenticate_and_encrypt(struct
> intel_connector *connector)
>  		}
>  	}
> 
> +	ret = hdcp2_enable_stream_encryption(connector);
> +
>  	return ret;
>  }
> 
> @@ -1896,11 +1924,23 @@ static int _intel_hdcp2_disable(struct
> intel_connector *connector)
>  	struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
>  	struct drm_i915_private *i915 = to_i915(connector->base.dev);
>  	struct hdcp_port_data *data = &dig_port->port_data;
> +	struct intel_hdcp *hdcp = &connector->hdcp;
>  	int ret;
> 
>  	drm_dbg_kms(&i915->drm, "[%s:%d] HDCP2.2 is being Disabled\n",
>  		    connector->base.name, connector->base.base.id);
> 
> +	if (hdcp->shim->stream_2_2_encryption) {
> +		ret = hdcp->shim->stream_2_2_encryption(dig_port, false);
> +		if (ret) {
> +			drm_err(&i915->drm, "Failed to disable HDCP 2.2 stream
> enc\n");
> +			return ret;
> +		}
> +	}
> +
> +	if (dig_port->num_hdcp_streams > 0)
> +		return ret;
> +
>  	ret = hdcp2_disable_encryption(connector);
> 
>  	if (hdcp2_deauthenticate_port(connector) < 0) @@ -1924,6 +1964,7 @@
> static int intel_hdcp2_check_link(struct intel_connector *connector)
>  	int ret = 0;
> 
>  	mutex_lock(&hdcp->mutex);
> +	mutex_lock(&dig_port->hdcp_mutex);
>  	cpu_transcoder = hdcp->cpu_transcoder;
> 
>  	/* hdcp2_check_link is expected only when HDCP2.2 is Enabled */ @@ -
> 2001,6 +2042,7 @@ static int intel_hdcp2_check_link(struct intel_connector
> *connector)
>  	}
> 
>  out:
> +	mutex_unlock(&dig_port->hdcp_mutex);
>  	mutex_unlock(&hdcp->mutex);
>  	return ret;
>  }
> @@ -2182,7 +2224,7 @@ int intel_hdcp_init(struct intel_connector *connector,
>  	if (!shim)
>  		return -EINVAL;
> 
> -	if (is_hdcp2_supported(dev_priv) && !connector->mst_port)
> +	if (is_hdcp2_supported(dev_priv))
>  		intel_hdcp2_init(connector, dig_port, shim);
> 
>  	ret =
> --
> 2.26.2