[PATCH 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
Link: https://patchwork.freedesktop.org/patch/msgid/20191212190230.188505-13-sean@poorly.run #v2

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
Changes in v3:
- Place the shim in the new intel_dp_hdcp.c file (Ville)
---
 drivers/gpu/drm/i915/display/intel_dp_hdcp.c | 78 +++++++++++++++++++-
 drivers/gpu/drm/i915/display/intel_dp_mst.c  | 14 ++++
 2 files changed, 91 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp_hdcp.c b/drivers/gpu/drm/i915/display/intel_dp_hdcp.c
index 0b6d90980e90..a93ad675e7bb 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_hdcp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_hdcp.c
@@ -11,6 +11,7 @@
 #include <drm/drm_print.h>
 
 #include "intel_display_types.h"
+#include "intel_ddi.h"
 #include "intel_dp.h"
 #include "intel_hdcp.h"
 
@@ -585,6 +586,78 @@ static const struct intel_hdcp_shim intel_dp_hdcp_shim = {
 	.protocol = HDCP_PROTOCOL_DP,
 };
 
+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_mst_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,
+};
+
 int intel_dp_init_hdcp(struct intel_digital_port *intel_dig_port,
 		       struct intel_connector *intel_connector)
 {
@@ -597,7 +670,10 @@ int intel_dp_init_hdcp(struct intel_digital_port *intel_dig_port,
 	if (!is_hdcp_supported(dev_priv, port))
 		return 0;
 
-	if (!intel_dp_is_edp(intel_dp))
+	if (!intel_encoder_is_mst(intel_encoder))
+		return intel_hdcp_init(intel_connector,
+				       &intel_dp_mst_hdcp_shim);
+	else if (!intel_dp_is_edp(intel_dp))
 		return intel_hdcp_init(intel_connector, &intel_dp_hdcp_shim);
 
 	return 0;
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index 560fc09d98e6..450be7378f52 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,
@@ -325,6 +326,8 @@ 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);
@@ -496,6 +499,13 @@ 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,
@@ -689,6 +699,10 @@ 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);
 
+	ret = intel_dp_init_hdcp(intel_dig_port, intel_connector);
+	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