drm/i915/hdcp: Enable Gen12 HDCP 1.4 DP MST support

Enable HDCP 1.4 over DP MST for Gen12.

v2:
- Enable HDCP for <= Gen12 platforms. [Ram]
v3:
- Connector detials in debug msg. [Ram]

Cc: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Ramalingam C <ramalingam.c@intel.com>
Tested-by: Karthik B S <karthik.b.s@intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210111081120.28417-10-anshuman.gupta@intel.com

drivers/gpu/drm/i915/display/intel_dp_mst.c

@@ -829,12 +829,11 @@ static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topolo
 	intel_attach_force_audio_property(connector);
 	intel_attach_broadcast_rgb_property(connector);
 
-
-	/* TODO: Figure out how to make HDCP work on GEN12+ */
-	if (INTEL_GEN(dev_priv) < 12) {
+	if (INTEL_GEN(dev_priv) <= 12) {
 		ret = intel_dp_init_hdcp(dig_port, intel_connector);
 		if (ret)
-			DRM_DEBUG_KMS("HDCP init failed, skipping.\n");
+			drm_dbg_kms(&dev_priv->drm, "[%s:%d] HDCP MST init failed, skipping.\n",
+				    connector->name, connector->base.id);
 	}
 
 	/*