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

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Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>

On 12/15/2023 10:39 AM, Suraj Kandpal wrote:
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.

--v3
-remove mst encoder check as branch device also act as repeater

Signed-off-by: Suraj Kandpal <suraj.kandpal@xxxxxxxxx>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>
---
  drivers/gpu/drm/i915/display/intel_hdcp.c | 6 ++++++
  1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c
index 39b3f7c0c77c..c264e443ffac 100644
--- a/drivers/gpu/drm/i915/display/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
@@ -1633,6 +1633,12 @@ 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) {
+		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);



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