drm/i915/hdcp: Fix Repeater authentication during topology change

When topology changes, before beginning a new HDCP authentication by
sending AKE_init message we need to first authenticate only the
repeater. Only after repeater authentication failure, it makes sense
to start a new HDCP authentication. Even though it made sense to not
enable HDCP directly from check_link and schedule it for later, repeater
authentication needs to be done immediately.

--v2
-Fix comment grammatical errors [Ankit]

Fixes: 47ef55a ("drm/i915/hdcp: Don't enable HDCP2.2 directly from check_link")
Signed-off-by: Suraj Kandpal <[email protected]>
Reviewed-by: Ankit Nautiyal <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
(cherry picked from commit 605a33e)
Signed-off-by: Rodrigo Vivi <[email protected]>

Author: surajk8

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

@@ -2188,6 +2188,19 @@ static int intel_hdcp2_check_link(struct intel_connector *connector)
 
 		drm_dbg_kms(display->drm,
 			    "HDCP2.2 Downstream topology change\n");
+
+		ret = hdcp2_authenticate_repeater_topology(connector);
+		if (!ret) {
+			intel_hdcp_update_value(connector,
+						DRM_MODE_CONTENT_PROTECTION_ENABLED,
+						true);
+			goto out;
+		}
+
+		drm_dbg_kms(display->drm,
+			    "[CONNECTOR:%d:%s] Repeater topology auth failed.(%d)\n",
+			    connector->base.base.id, connector->base.name,
+			    ret);
 	} else {
 		drm_dbg_kms(display->drm,
 			    "[CONNECTOR:%d:%s] HDCP2.2 link failed, retrying auth\n",