[Intel-gfx] [PATCH 1/1] drm/i915/hdcp: disable the QSES check for HDCP2.2 over MST

[Anshuman Gupta]

From: Juston Li <juston.li at intel.com>

Like the patch to disable QSES for HDCP 1.4 over MST
https://patchwork.freedesktop.org/patch/415297/ the HDCP2.2 spec
doesn't require QSES as well and we've seen QSES not supported on a
couple HDCP2.2 docks so far (Dell WD19 and Lenovo LDC-G2)

Remove it for now until we get a better idea of how widely supported
QSES is and how to support it optionally.

Signed-off-by: Juston Li <juston.li at intel.com>
Reviewed-by: Anshuman Gupta <anshuman.gupta at intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta at intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210127065034.2501119-4-juston.li@intel.com
---
 drivers/gpu/drm/i915/display/intel_dp_hdcp.c | 31 +-------------------
 1 file changed, 1 insertion(+), 30 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp_hdcp.c b/drivers/gpu/drm/i915/display/intel_dp_hdcp.c
index 4dba5bb15af5..40c516e90193 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_hdcp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_hdcp.c
@@ -698,30 +698,6 @@ intel_dp_mst_hdcp_stream_encryption(struct intel_connector *connector,
 	return 0;
 }
 
-static bool intel_dp_mst_get_qses_status(struct intel_digital_port *dig_port,
-					 struct intel_connector *connector)
-{
-	struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
-	struct drm_dp_query_stream_enc_status_ack_reply reply;
-	struct intel_dp *intel_dp = &dig_port->dp;
-	int ret;
-
-	ret = drm_dp_send_query_stream_enc_status(&intel_dp->mst_mgr,
-						  connector->port, &reply);
-	if (ret) {
-		drm_dbg_kms(&i915->drm,
-			    "[%s:%d] failed QSES ret=%d\n",
-			    connector->base.name, connector->base.base.id, ret);
-		return false;
-	}
-
-	drm_dbg_kms(&i915->drm, "[%s:%d] QSES stream auth: %d stream enc: %d\n",
-		    connector->base.name, connector->base.base.id,
-		    reply.auth_completed, reply.encryption_enabled);
-
-	return reply.auth_completed && reply.encryption_enabled;
-}
-
 static int
 intel_dp_mst_hdcp2_stream_encryption(struct intel_connector *connector,
 				     bool enable)
@@ -757,11 +733,6 @@ intel_dp_mst_hdcp2_stream_encryption(struct intel_connector *connector,
 	return 0;
 }
 
-/*
- * DP v2.0 I.3.3 ignore the stream signature L' in QSES reply msg reply.
- * I.3.5 MST source device may use a QSES msg to query downstream status
- * for a particular stream.
- */
 static
 int intel_dp_mst_hdcp2_check_link(struct intel_digital_port *dig_port,
 				  struct intel_connector *connector)
@@ -781,7 +752,7 @@ int intel_dp_mst_hdcp2_check_link(struct intel_digital_port *dig_port,
 			return ret;
 	}
 
-	return intel_dp_mst_get_qses_status(dig_port, connector) ? 0 : -EINVAL;
+	return 0;
 }
 
 static const struct intel_hdcp_shim intel_dp_mst_hdcp_shim = {
-- 
2.26.2