drm/i915/hdcp: Move source hdcp2 checks into its own function

Move checks on the source side for HDCP2.2 into its own function
so that they can be used in the HDCP remote capability check
function.
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240223081453.1576918-4-suraj.kandpal@intel.com

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

@@ -160,12 +160,14 @@ bool intel_hdcp_capable(struct intel_connector *connector)
 	return capable;
 }
 
-/* Is HDCP2.2 capable on Platform and Sink */
-bool intel_hdcp2_capable(struct intel_connector *connector)
+/*
+ * Check if the source has all the building blocks ready to make
+ * HDCP 2.2 work
+ */
+static bool intel_hdcp2_prerequisite(struct intel_connector *connector)
 {
 	struct drm_i915_private *i915 = to_i915(connector->base.dev);
 	struct intel_hdcp *hdcp = &connector->hdcp;
-	bool capable = false;
 
 	/* I915 support for HDCP2.2 */
 	if (!hdcp->hdcp2_supported)
@@ -185,6 +187,18 @@ bool intel_hdcp2_capable(struct intel_connector *connector)
 	}
 	mutex_unlock(&i915->display.hdcp.hdcp_mutex);
 
+	return true;
+}
+
+/* Is HDCP2.2 capable on Platform and Sink */
+bool intel_hdcp2_capable(struct intel_connector *connector)
+{
+	struct intel_hdcp *hdcp = &connector->hdcp;
+	bool capable = false;
+
+	if (!intel_hdcp2_prerequisite(connector))
+		return false;
+
 	/* Sink's capability for HDCP2.2 */
 	hdcp->shim->hdcp_2_2_capable(connector, &capable);