[PATCH 2/8] drm/i915: Stop encryption for repeater with no sink

[Ramalingam C <ramalingam.c@intel.com>]

If a HDCP repeater is detected with zero hdcp authenticated
downstream devices, there are two option as below:

1. Dont continue on second stage authentication. Disable encryption.
2. Continue with second stage authentication excluding the KSV list and
   continue encryption on success.

This patch adopts the option 1.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
---
 drivers/gpu/drm/i915/intel_hdcp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
index 0021511ae4d7..182a3c8a4e4a 100644
--- a/drivers/gpu/drm/i915/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/intel_hdcp.c
@@ -175,10 +175,10 @@ int intel_hdcp_auth_downstream(struct intel_connector *connector)
 		return -EPERM;
 	}
 
-	/* If there are no downstream devices, we're all done. */
+	/* If there are no downstream devices, we're not encrypting. */
 	num_downstream = DRM_HDCP_NUM_DOWNSTREAM(bstatus[0]);
 	if (num_downstream == 0)
-		return 0;
+		return -EINVAL;
 
 	ksv_fifo = kzalloc(num_downstream * DRM_HDCP_KSV_LEN, GFP_KERNEL);
 	if (!ksv_fifo)
-- 
2.7.4

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx