[PATCH v8 04/35] drm/i915: Initialize HDCP2.2

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

Add the HDCP2.2 initialization to the existing HDCP1.4 stack.

v2:
  mei interface handle is protected with mutex. [Chris Wilson]
v3:
  Notifiers are used for the mei interface state.
v4:
  Poll for mei client device state
  Error msg for out of mem [Uma]
  Inline req for init function removed [Uma]
v5:
  Rebase as Part of reordering.
  Component is used for the I915 and MEI_HDCP interface [Daniel]
v6:
  HDCP2.2 uses the I915 component master to communicate with mei_hdcp
	- [Daniel]
  Required HDCP2.2 variables defined [Sean Paul]
v7:
  intel_hdcp2.2_init returns void [Uma]
  Realigning the codes.
v8:
  Avoid using bool structure members.
  MEI interface related changes are moved into separate patch.
  Commit msg is updated accordingly.
  intel_hdcp_exit is defined and used from i915_unload

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c   |   2 +
 drivers/gpu/drm/i915/intel_dp.c   |   3 +-
 drivers/gpu/drm/i915/intel_drv.h  |  16 +++-
 drivers/gpu/drm/i915/intel_hdcp.c | 172 ++++++++++++++++++++++++--------------
 drivers/gpu/drm/i915/intel_hdmi.c |   2 +-
 5 files changed, 130 insertions(+), 65 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index b1d23c73c147..fbedd5024afe 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1755,6 +1755,8 @@ void i915_driver_unload(struct drm_device *dev)
 
 	disable_rpm_wakeref_asserts(dev_priv);
 
+	intel_hdcp_exit(dev_priv);
+
 	i915_driver_unregister(dev_priv);
 
 	if (i915_gem_suspend(dev_priv))
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 18e3a5a3d873..ac62af073688 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -6675,7 +6675,8 @@ intel_dp_init_connector(struct intel_digital_port *intel_dig_port,
 	intel_dp_add_properties(intel_dp, connector);
 
 	if (is_hdcp_supported(dev_priv, port) && !intel_dp_is_edp(intel_dp)) {
-		int ret = intel_hdcp_init(intel_connector, &intel_dp_hdcp_shim);
+		int ret = intel_hdcp_init(intel_connector, &intel_dp_hdcp_shim,
+					  false);
 		if (ret)
 			DRM_DEBUG_KMS("HDCP init failed, skipping.\n");
 	}
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index a62d77b76291..85a526598096 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -388,6 +388,17 @@ struct intel_hdcp {
 	u64 value;
 	struct delayed_work check_work;
 	struct work_struct prop_work;
+
+	/* HDCP2.2 related definitions */
+	/* Flag indicates whether this connector supports HDCP2.2 or not. */
+	u8 hdcp2_supported;
+
+	/*
+	 * Content Stream Type defined by content owner. TYPE0(0x0) content can
+	 * flow in the link protected by HDCP2.2 or HDCP1.4, where as TYPE1(0x1)
+	 * content can flow only through a link protected by HDCP2.2.
+	 */
+	u8 content_type;
 };
 
 struct intel_connector {
@@ -2016,12 +2027,15 @@ void intel_hdcp_atomic_check(struct drm_connector *connector,
 			     struct drm_connector_state *old_state,
 			     struct drm_connector_state *new_state);
 int intel_hdcp_init(struct intel_connector *connector,
-		    const struct intel_hdcp_shim *hdcp_shim);
+		    const struct intel_hdcp_shim *hdcp_shim,
+		    bool hdcp2_supported);
 int intel_hdcp_enable(struct intel_connector *connector);
 int intel_hdcp_disable(struct intel_connector *connector);
 int intel_hdcp_check_link(struct intel_connector *connector);
 bool is_hdcp_supported(struct drm_i915_private *dev_priv, enum port port);
 bool intel_hdcp_capable(struct intel_connector *connector);
+bool is_hdcp2_supported(struct drm_i915_private *dev_priv);
+void intel_hdcp_exit(struct drm_i915_private *dev_priv);
 
 /* intel_psr.c */
 #define CAN_PSR(dev_priv) (HAS_PSR(dev_priv) && dev_priv->psr.sink_support)
diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
index 04ba6c13e715..99dddb540958 100644
--- a/drivers/gpu/drm/i915/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/intel_hdcp.c
@@ -730,6 +730,65 @@ struct intel_connector *intel_hdcp_to_connector(struct intel_hdcp *hdcp)
 	return container_of(hdcp, struct intel_connector, hdcp);
 }
 
+/* Implements Part 3 of the HDCP authorization procedure */
+int intel_hdcp_check_link(struct intel_connector *connector)
+{
+	struct intel_hdcp *hdcp = &connector->hdcp;
+	struct drm_i915_private *dev_priv = connector->base.dev->dev_private;
+	struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector);
+	enum port port = intel_dig_port->base.port;
+	int ret = 0;
+
+	if (!hdcp->shim)
+		return -ENOENT;
+
+	mutex_lock(&hdcp->mutex);
+
+	if (hdcp->value == DRM_MODE_CONTENT_PROTECTION_UNDESIRED)
+		goto out;
+
+	if (!(I915_READ(PORT_HDCP_STATUS(port)) & HDCP_STATUS_ENC)) {
+		DRM_ERROR("%s:%d HDCP check failed: link is not encrypted,%x\n",
+			  connector->base.name, connector->base.base.id,
+			  I915_READ(PORT_HDCP_STATUS(port)));
+		ret = -ENXIO;
+		hdcp->value = DRM_MODE_CONTENT_PROTECTION_DESIRED;
+		schedule_work(&hdcp->prop_work);
+		goto out;
+	}
+
+	if (hdcp->shim->check_link(intel_dig_port)) {
+		if (hdcp->value != DRM_MODE_CONTENT_PROTECTION_UNDESIRED) {
+			hdcp->value = DRM_MODE_CONTENT_PROTECTION_ENABLED;
+			schedule_work(&hdcp->prop_work);
+		}
+		goto out;
+	}
+
+	DRM_DEBUG_KMS("[%s:%d] HDCP link failed, retrying authentication\n",
+		      connector->base.name, connector->base.base.id);
+
+	ret = _intel_hdcp_disable(connector);
+	if (ret) {
+		DRM_ERROR("Failed to disable hdcp (%d)\n", ret);
+		hdcp->value = DRM_MODE_CONTENT_PROTECTION_DESIRED;
+		schedule_work(&hdcp->prop_work);
+		goto out;
+	}
+
+	ret = _intel_hdcp_enable(connector);
+	if (ret) {
+		DRM_ERROR("Failed to enable hdcp (%d)\n", ret);
+		hdcp->value = DRM_MODE_CONTENT_PROTECTION_DESIRED;
+		schedule_work(&hdcp->prop_work);
+		goto out;
+	}
+
+out:
+	mutex_unlock(&hdcp->mutex);
+	return ret;
+}
+
 static void intel_hdcp_check_work(struct work_struct *work)
 {
 	struct intel_hdcp *hdcp = container_of(to_delayed_work(work),
@@ -774,14 +833,34 @@ bool is_hdcp_supported(struct drm_i915_private *dev_priv, enum port port)
 		!IS_CHERRYVIEW(dev_priv) && port < PORT_E);
 }
 
+bool is_hdcp2_supported(struct drm_i915_private *dev_priv)
+{
+	return ((INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv) ||
+		 IS_KABYLAKE(dev_priv)) && IS_ENABLED(CONFIG_INTEL_MEI_HDCP));
+}
+
+static void intel_hdcp2_init(struct intel_connector *connector)
+{
+	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+	struct intel_hdcp *hdcp = &connector->hdcp;
+
+	WARN_ON(!is_hdcp2_supported(dev_priv));
+
+	/* TODO: MEI interface needs to be initialized here */
+	hdcp->hdcp2_supported = 1;
+}
+
 int intel_hdcp_init(struct intel_connector *connector,
-		    const struct intel_hdcp_shim *shim)
+		    const struct intel_hdcp_shim *shim,
+		    bool hdcp2_supported)
 {
 	struct intel_hdcp *hdcp = &connector->hdcp;
 	int ret;
 
-	ret = drm_connector_attach_content_protection_property(
-			&connector->base);
+	if (!shim)
+		return -EINVAL;
+
+	ret = drm_connector_attach_content_protection_property(&connector->base);
 	if (ret)
 		return ret;
 
@@ -789,9 +868,37 @@ int intel_hdcp_init(struct intel_connector *connector,
 	mutex_init(&hdcp->mutex);
 	INIT_DELAYED_WORK(&hdcp->check_work, intel_hdcp_check_work);
 	INIT_WORK(&hdcp->prop_work, intel_hdcp_prop_work);
+
+	if (hdcp2_supported)
+		intel_hdcp2_init(connector);
+
 	return 0;
 }
 
+void intel_hdcp_exit(struct drm_i915_private *dev_priv)
+{
+	struct drm_device *dev = &dev_priv->drm;
+	struct intel_connector *intel_connector;
+	struct drm_connector *connector;
+	struct drm_connector_list_iter conn_iter;
+
+	drm_connector_list_iter_begin(dev, &conn_iter);
+	drm_for_each_connector_iter(connector, &conn_iter) {
+		intel_connector = to_intel_connector(connector);
+
+		if (!intel_connector->hdcp.shim)
+			continue;
+
+		intel_hdcp_disable(intel_connector);
+
+		mutex_lock(&intel_connector->hdcp.mutex);
+		intel_connector->hdcp.hdcp2_supported = 0;
+		intel_connector->hdcp.shim = NULL;
+		mutex_unlock(&intel_connector->hdcp.mutex);
+	}
+	drm_connector_list_iter_end(&conn_iter);
+}
+
 int intel_hdcp_enable(struct intel_connector *connector)
 {
 	struct intel_hdcp *hdcp = &connector->hdcp;
@@ -867,62 +974,3 @@ void intel_hdcp_atomic_check(struct drm_connector *connector,
 						   new_state->crtc);
 	crtc_state->mode_changed = true;
 }
-
-/* Implements Part 3 of the HDCP authorization procedure */
-int intel_hdcp_check_link(struct intel_connector *connector)
-{
-	struct intel_hdcp *hdcp = &connector->hdcp;
-	struct drm_i915_private *dev_priv = connector->base.dev->dev_private;
-	struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector);
-	enum port port = intel_dig_port->base.port;
-	int ret = 0;
-
-	if (!hdcp->shim)
-		return -ENOENT;
-
-	mutex_lock(&hdcp->mutex);
-
-	if (hdcp->value == DRM_MODE_CONTENT_PROTECTION_UNDESIRED)
-		goto out;
-
-	if (!(I915_READ(PORT_HDCP_STATUS(port)) & HDCP_STATUS_ENC)) {
-		DRM_ERROR("%s:%d HDCP check failed: link is not encrypted,%x\n",
-			  connector->base.name, connector->base.base.id,
-			  I915_READ(PORT_HDCP_STATUS(port)));
-		ret = -ENXIO;
-		hdcp->value = DRM_MODE_CONTENT_PROTECTION_DESIRED;
-		schedule_work(&hdcp->prop_work);
-		goto out;
-	}
-
-	if (hdcp->shim->check_link(intel_dig_port)) {
-		if (hdcp->value != DRM_MODE_CONTENT_PROTECTION_UNDESIRED) {
-			hdcp->value = DRM_MODE_CONTENT_PROTECTION_ENABLED;
-			schedule_work(&hdcp->prop_work);
-		}
-		goto out;
-	}
-
-	DRM_DEBUG_KMS("[%s:%d] HDCP link failed, retrying authentication\n",
-		      connector->base.name, connector->base.base.id);
-
-	ret = _intel_hdcp_disable(connector);
-	if (ret) {
-		DRM_ERROR("Failed to disable hdcp (%d)\n", ret);
-		hdcp->value = DRM_MODE_CONTENT_PROTECTION_DESIRED;
-		schedule_work(&hdcp->prop_work);
-		goto out;
-	}
-
-	ret = _intel_hdcp_enable(connector);
-	if (ret) {
-		DRM_DEBUG_KMS("Failed to enable hdcp (%d)\n", ret);
-		hdcp->value = DRM_MODE_CONTENT_PROTECTION_DESIRED;
-		schedule_work(&hdcp->prop_work);
-		goto out;
-	}
-
-out:
-	mutex_unlock(&hdcp->mutex);
-	return ret;
-}
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index e2c6a2b3e8f2..e755a3370bca 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -2417,7 +2417,7 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
 
 	if (is_hdcp_supported(dev_priv, port)) {
 		int ret = intel_hdcp_init(intel_connector,
-					  &intel_hdmi_hdcp_shim);
+					  &intel_hdmi_hdcp_shim, false);
 		if (ret)
 			DRM_DEBUG_KMS("HDCP init failed, skipping.\n");
 	}
-- 
2.7.4

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