drm/i915: Initialize HDCP2.2

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
v9:
  Movement of the hdcp_check_link is moved to new patch [Daniel]
  intel_hdcp2_exit is removed as mei_comp will be unbind in i915_unload.
v10:
  bool is used in struct to make coding simpler. [Daniel]
  hdmi hdcp init is placed correctly after encoder attachment.
v11:
  hdcp2_capability check is moved into hdcp.c [Tomas]

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1550338640-17470-4-git-send-email-ramalingam.c@intel.com

1 files changed, 26 insertions, 2 deletions

diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
index 8cb85b07cfde..7b1097d79fb8 100644
--- a/drivers/gpu/drm/i915/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/intel_hdcp.c
@@ -832,14 +832,34 @@ bool is_hdcp_supported(struct drm_i915_private *dev_priv, enum port port)
 	return INTEL_GEN(dev_priv) >= 9 && port < PORT_E;
 }
 
+static bool is_hdcp2_supported(struct drm_i915_private *dev_priv)
+{
+	if (!IS_ENABLED(CONFIG_INTEL_MEI_HDCP))
+		return false;
+
+	return (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv) ||
+		IS_KABYLAKE(dev_priv));
+}
+
+static void intel_hdcp2_init(struct intel_connector *connector)
+{
+	struct intel_hdcp *hdcp = &connector->hdcp;
+
+	/* TODO: MEI interface needs to be initialized here */
+	hdcp->hdcp2_supported = true;
+}
+
 int intel_hdcp_init(struct intel_connector *connector,
 		    const struct intel_hdcp_shim *shim)
 {
+	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 	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;
 
@@ -847,6 +867,10 @@ 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 (is_hdcp2_supported(dev_priv))
+		intel_hdcp2_init(connector);
+
 	return 0;
 }