[Intel-gfx] [PATCH] drm/i915/hdcp: Fail Repeater authentication if Type1 device not present

[Suraj Kandpal]

Fail repeater authentication step in case RX_INFO indicates
HDCP1.x or HDCP2.0/2.1 device is present downstream in repeater
topology and content type set by userspace is Type1.

--v2
-Fix build error.

Signed-off-by: Suraj Kandpal <suraj.kandpal at intel.com>
---
 drivers/gpu/drm/i915/display/intel_hdcp.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c
index 39b3f7c0c77c..07d110c5841d 100644
--- a/drivers/gpu/drm/i915/display/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
@@ -1633,6 +1633,13 @@ int hdcp2_authenticate_repeater_topology(struct intel_connector *connector)
 		!HDCP_2_2_HDCP1_DEVICE_CONNECTED(rx_info[1]) &&
 		!HDCP_2_2_HDCP_2_0_REP_CONNECTED(rx_info[1]);
 
+	if (!dig_port->hdcp_mst_type1_capable && hdcp->content_type &&
+	    !intel_encoder_is_mst(connector->encoder)) {
+		drm_dbg_kms(&i915->drm,
+			    "HDCP1.x or 2.0 Legacy Device Downstream\n");
+		return -EINVAL;
+	}
+
 	/* Converting and Storing the seq_num_v to local variable as DWORD */
 	seq_num_v =
 		drm_hdcp_be24_to_cpu((const u8 *)msgs.recvid_list.seq_num_v);
-- 
2.25.1