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

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index eec4ed9..5691816 100644 (file)
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -404,6 +404,17 @@ 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. */
+       bool 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 {

diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
index 8cb85b0..7b1097d 100644 (file)
--- 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;
 }
 

diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index f125a62..faeedf7 100644 (file)
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -2427,6 +2427,9 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
 
        intel_hdmi_add_properties(intel_hdmi, connector);
 
+       intel_connector_attach_encoder(intel_connector, intel_encoder);
+       intel_hdmi->attached_connector = intel_connector;
+
        if (is_hdcp_supported(dev_priv, port)) {
                int ret = intel_hdcp_init(intel_connector,
                                          &intel_hdmi_hdcp_shim);
@@ -2434,9 +2437,6 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
                        DRM_DEBUG_KMS("HDCP init failed, skipping.\n");
        }
 
-       intel_connector_attach_encoder(intel_connector, intel_encoder);
-       intel_hdmi->attached_connector = intel_connector;
-
        /* For G4X desktop chip, PEG_BAND_GAP_DATA 3:0 must first be written
         * 0xd.  Failure to do so will result in spurious interrupts being
         * generated on the port when a cable is not attached.