Default connector property called "Content Protection" is added to
represent the content protection state of a connector and to
configure the same.

Userspace can request for enable or disable of content protection
on a connector. Set "DESIRED" for Enable and "UNDESIRED" for disable.

Content protection states defined:
        DRM_MODE_CONTENT_PROTECTION_UNSUPPORTED         - Unsupported
        DRM_MODE_CONTENT_PROTECTION_UNDESIRED           - Undesired
        DRM_MODE_CONTENT_PROTECTION_DESIRED             - Desired
        DRM_MODE_CONTENT_PROTECTION_ENABLED             - Enabled

v2: Redesigned the property to match with CP needs of CrOS [Sean].
v3: Renamed the state names. Header is removed [Sean].
v4: Aligned with existing userspace(CrOS's usage) [Sean].

Signed-off-by: Ramalingam C <ramalinga...@intel.com>
---
 drivers/gpu/drm/drm_connector.c | 24 ++++++++++++++++++++++++
 include/drm/drm_mode_config.h   |  5 +++++
 include/uapi/drm/drm_mode.h     |  7 +++++++
 3 files changed, 36 insertions(+)

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index 8072e6e4c62c..f4ce0af63ad3 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -617,6 +617,14 @@ static const struct drm_prop_enum_list 
drm_link_status_enum_list[] = {
 };
 DRM_ENUM_NAME_FN(drm_get_link_status_name, drm_link_status_enum_list)
 
+static const struct drm_prop_enum_list drm_cp_enum_list[] = {
+       { DRM_MODE_CONTENT_PROTECTION_UNSUPPORTED,      "Unsupported" },
+       { DRM_MODE_CONTENT_PROTECTION_UNDESIRED,        "Undesired" },
+       { DRM_MODE_CONTENT_PROTECTION_DESIRED,          "Desired" },
+       { DRM_MODE_CONTENT_PROTECTION_ENABLED,          "Enabled" },
+};
+DRM_ENUM_NAME_FN(drm_get_cp_status_name, drm_cp_enum_list)
+
 /**
  * drm_display_info_set_bus_formats - set the supported bus formats
  * @info: display info to store bus formats in
@@ -741,6 +749,15 @@ DRM_ENUM_NAME_FN(drm_get_tv_subconnector_name,
  *      value of link-status is "GOOD". If something fails during or after 
modeset,
  *      the kernel driver may set this to "BAD" and issue a hotplug uevent. 
Drivers
  *      should update this value using 
drm_mode_connector_set_link_status_property().
+ * Content Protection:
+ *      Connector Content Protection property to indicate the content 
protection
+ *      status of a connector. Default value is "UNDESIRED". Kernel will set
+ *      to "UNSUPPORTED" if there is no common HDCP ver supported between Src
+ *      and Sink. User space could set this to "DESIRED" to enabled the content
+ *      protection on the connector. If content protection setup process is
+ *      success, kernel will set this property to "ENABLED". To Disable the
+ *      content protection on the connector userspace could set this property 
to
+ *      "UNDESIRED".
  *
  * Connectors also have one standardized atomic property:
  *
@@ -789,6 +806,13 @@ int drm_connector_create_standard_properties(struct 
drm_device *dev)
                return -ENOMEM;
        dev->mode_config.link_status_property = prop;
 
+       prop = drm_property_create_enum(dev, 0, "Content Protection",
+                                       drm_cp_enum_list,
+                                       ARRAY_SIZE(drm_cp_enum_list));
+       if (!prop)
+               return -ENOMEM;
+       dev->mode_config.cp_property = prop;
+
        return 0;
 }
 
diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
index 42981711189b..72e2b4e6d51d 100644
--- a/include/drm/drm_mode_config.h
+++ b/include/drm/drm_mode_config.h
@@ -538,6 +538,11 @@ struct drm_mode_config {
         */
        struct drm_property *link_status_property;
        /**
+        * @cp_property: Default connector property for content protection
+        * status of a connector
+        */
+       struct drm_property *cp_property;
+       /**
         * @plane_type_property: Default plane property to differentiate
         * CURSOR, PRIMARY and OVERLAY legacy uses of planes.
         */
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index 403339f98a92..61685a64cd6a 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -173,6 +173,13 @@ extern "C" {
                DRM_MODE_REFLECT_X | \
                DRM_MODE_REFLECT_Y)
 
+/* Content Protection options */
+enum cp_state {
+       DRM_MODE_CONTENT_PROTECTION_UNSUPPORTED = -1,
+       DRM_MODE_CONTENT_PROTECTION_UNDESIRED,
+       DRM_MODE_CONTENT_PROTECTION_DESIRED,
+       DRM_MODE_CONTENT_PROTECTION_ENABLED,
+};
 
 struct drm_mode_modeinfo {
        __u32 clock;
-- 
2.7.4

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