[PATCH v2 7/8] drm/i915: Reauthenticate HDCP on failure

[Ramalingam C <ramalingam.c@xxxxxxxxx>]

Incase of HDCP authentication failure, HDCP spec expects
reauthentication. Hence this patch adds the reauthentications
to be compliance with spec.

v2:
  do-while to for loop for simplicity. [Seanpaul].

Signed-off-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
---
 drivers/gpu/drm/i915/intel_hdcp.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
index 4b2821feb4b4..4a3db5de229e 100644
--- a/drivers/gpu/drm/i915/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/intel_hdcp.c
@@ -572,7 +572,7 @@ static int _intel_hdcp_disable(struct intel_connector *connector)
 static int _intel_hdcp_enable(struct intel_connector *connector)
 {
 	struct drm_i915_private *dev_priv = connector->base.dev->dev_private;
-	int i, ret;
+	int i, ret, tries = 3;
 
 	DRM_DEBUG_KMS("[%s:%d] HDCP is being enabled...\n",
 		      connector->base.name, connector->base.base.id);
@@ -593,17 +593,26 @@ static int _intel_hdcp_enable(struct intel_connector *connector)
 		return ret;
 	}
 
-	ret = intel_hdcp_auth(conn_to_dig_port(connector),
-			      connector->hdcp_shim);
-	if (ret) {
-		DRM_ERROR("Failed to authenticate HDCP (%d)\n", ret);
+	/* Incase of authentication failures, HDCP spec expects reauth. */
+	for (i = 0; i < tries; i++) {
+		if (i)
+			DRM_DEBUG_KMS("[%s:%d] HDCP Reauth...\n",
+				      connector->base.name,
+				      connector->base.base.id);
+
+		ret = intel_hdcp_auth(conn_to_dig_port(connector),
+				      connector->hdcp_shim);
+		if (!ret)
+			return 0;
+
+		DRM_ERROR("[%s:%d] Failed to authenticate HDCP (%d)\n",
+			  connector->base.name, connector->base.base.id, ret);
 
 		/* Ensuring HDCP encryption and signalling are stopped. */
 		_intel_hdcp_disable(connector);
-		return ret;
 	}
 
-	return 0;
+	return ret;
 }
 
 static void intel_hdcp_check_work(struct work_struct *work)
-- 
2.7.4

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