When repeater notifies a downstream topology change, this patch
reauthenticate the repeater alone with out disabling the hdcp
encryption. If that fails then complete reauthentication is executed.

Signed-off-by: Ramalingam C <ramalinga...@intel.com>
---
 drivers/gpu/drm/i915/intel_hdcp.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_hdcp.c 
b/drivers/gpu/drm/i915/intel_hdcp.c
index 076a0b0d2ae9..f5e606cc667f 100644
--- a/drivers/gpu/drm/i915/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/intel_hdcp.c
@@ -1505,9 +1505,23 @@ static int intel_hdcp2_check_link(struct intel_hdcp 
*hdcp)
                goto out;
        }
 
+       if (ret == DRM_HDCP_TOPOLOGY_CHANGE) {
+               if (hdcp->hdcp_value != DRM_MODE_CONTENT_PROTECTION_UNDESIRED) {
+                       DRM_DEBUG_KMS("HDCP2.2 Downstream topology change\n");
+                       ret = hdcp2_authenticate_repeater_topology(hdcp);
+                       if (ret < 0)
+                               goto hdcp2_reauth;
+
+                       hdcp->hdcp_value = DRM_MODE_CONTENT_PROTECTION_ENABLED;
+                       schedule_work(&hdcp->hdcp_prop_work);
+               }
+               goto out;
+       }
+
        DRM_INFO("[%s:%d] HDCP2.2 link failed, retrying authentication\n",
                 hdcp->connector->base.name, hdcp->connector->base.base.id);
 
+hdcp2_reauth:
        ret = _intel_hdcp2_disable(hdcp);
        if (ret) {
                DRM_ERROR("[%s:%d] Failed to disable hdcp2.2 (%d)\n",
-- 
2.7.4

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