> -----Original Message-----
> From: Anshuman Gupta <anshuman.gu...@intel.com>
> Sent: Friday, October 23, 2020 5:51 PM
> To: intel-...@lists.freedesktop.org; dri-devel@lists.freedesktop.org
> Cc: seanp...@chromium.org; Nikula, Jani <jani.nik...@intel.com>; C,
> Ramalingam <ramalinga...@intel.com>; Li, Juston <juston...@intel.com>;
> Shankar, Uma <uma.shan...@intel.com>; Gupta, Anshuman
> <anshuman.gu...@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.shan...@intel.com>
> Cc: Ramalingam C <ramalinga...@intel.com>
> Signed-off-by: Anshuman Gupta <anshuman.gu...@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
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