[PATCH v2 12/12] drm/i915: Add HDCP 1.4 support for MST connectors

[Sean Paul]

From: Sean Paul <seanpaul at chromium.org>

Now that all the groundwork has been laid, we can turn on HDCP 1.4 over
MST. Everything except for toggling the HDCP signalling and HDCP 2.2
support is the same as the DP case, so we'll re-use those callbacks

Signed-off-by: Sean Paul <seanpaul at chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20191203173638.94919-12-sean@poorly.run #v1

Changes in v2:
- Toggle HDCP from encoder disable/enable
- Don't disable HDCP on MST connector destroy, leave that for encoder
  disable, just ensure the check_work routine isn't running any longer
---
 drivers/gpu/drm/i915/display/intel_dp_mst.c | 89 +++++++++++++++++++++
 1 file changed, 89 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index fbd9a6c543e7..1e08ce751abe 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -36,6 +36,7 @@
 #include "intel_dp.h"
 #include "intel_dp_mst.h"
 #include "intel_dpio_phy.h"
+#include "intel_hdcp.h"
 
 static int intel_dp_mst_compute_link_config(struct intel_encoder *encoder,
 					    struct intel_crtc_state *crtc_state,
@@ -215,6 +216,8 @@ static void intel_mst_disable_dp(struct intel_encoder *encoder,
 
 	DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
 
+	intel_hdcp_disable(intel_mst->connector);
+
 	drm_dp_mst_reset_vcpi_slots(&intel_dp->mst_mgr, connector->port);
 
 	ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
@@ -378,6 +381,13 @@ static void intel_mst_enable_dp(struct intel_encoder *encoder,
 	drm_dp_update_payload_part2(&intel_dp->mst_mgr);
 	if (pipe_config->has_audio)
 		intel_audio_codec_enable(encoder, pipe_config, conn_state);
+
+	/* Enable hdcp if it's desired */
+	if (conn_state->content_protection ==
+	    DRM_MODE_CONTENT_PROTECTION_DESIRED)
+		intel_hdcp_enable(to_intel_connector(conn_state->connector),
+				  pipe_config->cpu_transcoder,
+				  (u8)conn_state->hdcp_content_type);
 }
 
 static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,
@@ -522,11 +532,84 @@ static bool intel_dp_mst_get_hw_state(struct intel_connector *connector)
 	return false;
 }
 
+static int
+intel_dp_mst_hdcp_toggle_signalling(struct intel_digital_port *intel_dig_port,
+				    enum transcoder cpu_transcoder,
+				    bool enable)
+{
+	int ret;
+
+	ret = intel_ddi_toggle_hdcp_signalling(&intel_dig_port->base,
+					       cpu_transcoder, enable);
+	if (ret)
+		DRM_DEBUG_KMS("%s HDCP signalling failed (%d)\n",
+			      enable ? "Enable" : "Disable", ret);
+	return ret;
+}
+
+static
+int intel_dp_mst_hdcp2_write_msg(struct intel_digital_port *intel_dig_port,
+				 void *buf, size_t size)
+{
+	return -EOPNOTSUPP;
+}
+
+static
+int intel_dp_mst_hdcp2_read_msg(struct intel_digital_port *intel_dig_port,
+				u8 msg_id, void *buf, size_t size)
+{
+	return -EOPNOTSUPP;
+}
+
+static int
+intel_dp_mst_hdcp2_config_stream_type(struct intel_digital_port *intel_dig_port,
+				      bool is_repeater, u8 content_type)
+{
+	return -EOPNOTSUPP;
+}
+
+static
+int intel_dp_mst_hdcp2_check_link(struct intel_digital_port *intel_dig_port)
+{
+	return -EOPNOTSUPP;
+}
+
+static
+int intel_dp_mst_hdcp2_capable(struct intel_digital_port *intel_dig_port,
+			       bool *capable)
+{
+	*capable = false;
+	return 0;
+}
+
+static const struct intel_hdcp_shim intel_dp_hdcp_shim = {
+	.write_an_aksv = intel_dp_hdcp_write_an_aksv,
+	.read_bksv = intel_dp_hdcp_read_bksv,
+	.read_bstatus = intel_dp_hdcp_read_bstatus,
+	.repeater_present = intel_dp_hdcp_repeater_present,
+	.read_ri_prime = intel_dp_hdcp_read_ri_prime,
+	.read_ksv_ready = intel_dp_hdcp_read_ksv_ready,
+	.read_ksv_fifo = intel_dp_hdcp_read_ksv_fifo,
+	.read_v_prime_part = intel_dp_hdcp_read_v_prime_part,
+	.toggle_signalling = intel_dp_mst_hdcp_toggle_signalling,
+	.check_link = intel_dp_hdcp_check_link,
+	.hdcp_capable = intel_dp_hdcp_capable,
+
+	.write_2_2_msg = intel_dp_mst_hdcp2_write_msg,
+	.read_2_2_msg = intel_dp_mst_hdcp2_read_msg,
+	.config_stream_type = intel_dp_mst_hdcp2_config_stream_type,
+	.check_2_2_link = intel_dp_mst_hdcp2_check_link,
+	.hdcp_2_2_capable = intel_dp_mst_hdcp2_capable,
+
+	.protocol = HDCP_PROTOCOL_DP,
+};
+
 static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, const char *pathprop)
 {
 	struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
 	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 	struct drm_device *dev = intel_dig_port->base.base.dev;
+	struct intel_encoder *intel_encoder = &intel_dig_port->base;
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct intel_connector *intel_connector;
 	struct drm_connector *connector;
@@ -571,6 +654,12 @@ 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);
 
+	if (is_hdcp_supported(dev_priv, intel_encoder->port)) {
+		int ret = intel_hdcp_init(intel_connector, &intel_dp_hdcp_shim);
+		if (ret)
+			DRM_DEBUG_KMS("HDCP init failed, skipping.\n");
+	}
+
 	/*
 	 * Reuse the prop from the SST connector because we're
 	 * not allowed to create new props after device registration.
-- 
Sean Paul, Software Engineer, Google / Chromium OS