[Intel-gfx] [PATCH v6 05/18] drm/i915/hdcp: DP MST transcoder for link and stream

[Anshuman Gupta]

Gen12 has H/W delta with respect to HDCP{1.x,2.x} display engine
instances lies in Transcoder instead of DDI as in Gen11.

This requires hdcp driver to use mst_master_transcoder for link
authentication and stream transcoder for stream encryption
separately.

This will be used for both HDCP 1.4 and HDCP 2.2 over DP MST
on Gen12.

Cc: Ramalingam C <ramalingam.c at intel.com>
Reviewed-by: Uma Shankar <uma.shankar at intel.com>
Reviewed-by: Ramalingam C <ramalingam.c at intel.com>
Tested-by: Karthik B S <karthik.b.s at intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta at intel.com>
---
 drivers/gpu/drm/i915/display/intel_ddi.c          |  2 +-
 .../gpu/drm/i915/display/intel_display_types.h    |  2 ++
 drivers/gpu/drm/i915/display/intel_dp_mst.c       |  2 +-
 drivers/gpu/drm/i915/display/intel_hdcp.c         | 15 +++++++++++----
 drivers/gpu/drm/i915/display/intel_hdcp.h         |  2 +-
 5 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 92940a0c5ef8..a5a66f4346bc 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -4240,7 +4240,7 @@ static void intel_enable_ddi(struct intel_atomic_state *state,
 	if (conn_state->content_protection ==
 	    DRM_MODE_CONTENT_PROTECTION_DESIRED)
 		intel_hdcp_enable(to_intel_connector(conn_state->connector),
-				  crtc_state->cpu_transcoder,
+				  crtc_state,
 				  (u8)conn_state->hdcp_content_type);
 }
 
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index ce82d654d0f2..59f3e6d64af8 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -432,6 +432,8 @@ struct intel_hdcp {
 	 * Hence caching the transcoder here.
 	 */
 	enum transcoder cpu_transcoder;
+	/* Only used for DP MST stream encryption */
+	enum transcoder stream_transcoder;
 };
 
 struct intel_connector {
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index 27f04aed8764..47beb442094f 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -569,7 +569,7 @@ static void intel_mst_enable_dp(struct intel_atomic_state *state,
 	if (conn_state->content_protection ==
 	    DRM_MODE_CONTENT_PROTECTION_DESIRED)
 		intel_hdcp_enable(to_intel_connector(conn_state->connector),
-				  pipe_config->cpu_transcoder,
+				  pipe_config,
 				  (u8)conn_state->hdcp_content_type);
 }
 
diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c
index 7d63e9495956..293f72d1d215 100644
--- a/drivers/gpu/drm/i915/display/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
@@ -2095,7 +2095,7 @@ int intel_hdcp_init(struct intel_connector *connector,
 }
 
 int intel_hdcp_enable(struct intel_connector *connector,
-		      enum transcoder cpu_transcoder, u8 content_type)
+		      const struct intel_crtc_state *pipe_config, u8 content_type)
 {
 	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 	struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
@@ -2117,10 +2117,17 @@ int intel_hdcp_enable(struct intel_connector *connector,
 	drm_WARN_ON(&dev_priv->drm,
 		    hdcp->value == DRM_MODE_CONTENT_PROTECTION_ENABLED);
 	hdcp->content_type = content_type;
-	hdcp->cpu_transcoder = cpu_transcoder;
+
+	if (intel_crtc_has_type(pipe_config, INTEL_OUTPUT_DP_MST)) {
+		hdcp->cpu_transcoder = pipe_config->mst_master_transcoder;
+		hdcp->stream_transcoder = pipe_config->cpu_transcoder;
+	} else {
+		hdcp->cpu_transcoder = pipe_config->cpu_transcoder;
+		hdcp->stream_transcoder = INVALID_TRANSCODER;
+	}
 
 	if (INTEL_GEN(dev_priv) >= 12)
-		hdcp->port_data.fw_tc = intel_get_mei_fw_tc(cpu_transcoder);
+		hdcp->port_data.fw_tc = intel_get_mei_fw_tc(hdcp->cpu_transcoder);
 
 	/*
 	 * Considering that HDCP2.2 is more secure than HDCP1.4, If the setup
@@ -2240,7 +2247,7 @@ void intel_hdcp_update_pipe(struct intel_atomic_state *state,
 
 	if (desired_and_not_enabled || content_protection_type_changed)
 		intel_hdcp_enable(connector,
-				  crtc_state->cpu_transcoder,
+				  crtc_state,
 				  (u8)conn_state->hdcp_content_type);
 }
 
diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.h b/drivers/gpu/drm/i915/display/intel_hdcp.h
index 1bbf5b67ed0a..bc51c1e9b481 100644
--- a/drivers/gpu/drm/i915/display/intel_hdcp.h
+++ b/drivers/gpu/drm/i915/display/intel_hdcp.h
@@ -25,7 +25,7 @@ void intel_hdcp_atomic_check(struct drm_connector *connector,
 int intel_hdcp_init(struct intel_connector *connector, enum port port,
 		    const struct intel_hdcp_shim *hdcp_shim);
 int intel_hdcp_enable(struct intel_connector *connector,
-		      enum transcoder cpu_transcoder, u8 content_type);
+		      const struct intel_crtc_state *pipe_config, u8 content_type);
 int intel_hdcp_disable(struct intel_connector *connector);
 void intel_hdcp_update_pipe(struct intel_atomic_state *state,
 			    struct intel_encoder *encoder,
-- 
2.26.2