Enable HDCP 1.4 over DP MST for Gen12.
This also enable the stream encryption support for
older generations.
Cc: Ramalingam C <ramalingam.c@xxxxxxxxx>
Signed-off-by: Anshuman Gupta <anshuman.gupta@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_dp_mst.c | 10 ++----
drivers/gpu/drm/i915/display/intel_hdcp.c | 36 +++++++++++++--------
2 files changed, 26 insertions(+), 20 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index c6107182519f..932190526919 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -809,13 +809,9 @@ static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topolo
intel_attach_force_audio_property(connector);
intel_attach_broadcast_rgb_property(connector);
-
- /* TODO: Figure out how to make HDCP work on GEN12+ */
- if (INTEL_GEN(dev_priv) < 12) {
- ret = intel_dp_init_hdcp(dig_port, intel_connector);
- if (ret)
- DRM_DEBUG_KMS("HDCP init failed, skipping.\n");
- }
+ ret = intel_dp_init_hdcp(dig_port, intel_connector);
+ if (ret)
+ drm_dbg_kms(&dev_priv->drm, "HDCP init failed, skipping.\n");
/*
* Reuse the prop from the SST connector because we're
diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c
index f401fdaa7336..64dbd3cb0571 100644
--- a/drivers/gpu/drm/i915/display/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
@@ -612,7 +612,12 @@ int intel_hdcp_auth_downstream(struct intel_connector *connector)
return ret;
}
-/* Implements Part 1 of the HDCP authorization procedure */
+/*
+ * Implements Part 1 of the HDCP authorization procedure.
+ * Authentication Part 1 steps for Multi-stream DisplayPort.
+ * Step 1. Auth Part 1 sequence on the driving MST Trasport Link.
+ * Step 2. Enable encryption for each stream that requires encryption.
+ */
static int intel_hdcp_auth(struct intel_connector *connector)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
@@ -766,10 +771,14 @@ static int intel_hdcp_auth(struct intel_connector *connector)
return -ETIMEDOUT;
}
- /*
- * XXX: If we have MST-connected devices, we need to enable encryption
- * on those as well.
- */
+ /* DP MST Auth Part 1 Step 2.a and Step 2.b */
+ if (shim->stream_encryption) {
+ ret = shim->stream_encryption(dig_port, true);
+ if (ret) {
+ drm_err(&dev_priv->drm, "Failed to enable HDCP 1.4 stream enc\n");
+ return ret;
+ }
+ }
if (repeater_present)
return intel_hdcp_auth_downstream(connector);
@@ -793,15 +802,16 @@ static int _intel_hdcp_disable(struct intel_connector *connector)
/*
* If there are other connectors on this port using HDCP, don't disable
- * it. Instead, toggle the HDCP signalling off on that particular
- * connector/pipe and exit.
+ * it. Instead, deselect HDCP Multiplestream Bit on that particular
+ * connector/pipe (Step 1), poll for stream encryption status to be
+ * to be disable (Step 2) and exit.
*/
- if (dig_port->num_hdcp_streams > 0) {
- ret = hdcp->shim->toggle_signalling(dig_port,
- cpu_transcoder, false);
- if (ret)
- DRM_ERROR("Failed to disable HDCP signalling\n");
- return ret;
+ if (dig_port->num_hdcp_streams > 0 && hdcp->shim->stream_encryption) {
+ ret = hdcp->shim->stream_encryption(dig_port, false);
+ if (ret) {
+ drm_err(&dev_priv->drm, "Failed to disable HDCP 1.4 stream enc\n");
+ return ret;
+ }
}
hdcp->hdcp_encrypted = false;
--
2.26.2
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