[RFC v3] drm/hdcp: drm enum property for CP State

[Ramalingam C]

DRM connector property is created to represent the content protection
state of the connector and to configure the same.

Content protection states defined:
	DRM_MODE_CONTENT_PROTECTION_UNSUPPORTED 	- Unsupported
	DRM_MODE_CONTENT_PROTECTION_DISABLE		- Disabled
	DRM_MODE_CONTENT_PROTECTION_ENABLE		- Enabled

v2: Redesigned the property to match with CP needs of CrOS [Sean].

v3: Renamed the state names. Header is removed [sean].

Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
---
 drivers/gpu/drm/drm_connector.c | 14 ++++++++++++++
 include/drm/drm_mode_config.h   |  5 +++++
 include/uapi/drm/drm_mode.h     |  5 +++++
 3 files changed, 24 insertions(+)

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index 5cd61af..d6aaa08 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -617,6 +617,13 @@ 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_DISABLE,		"Disabled" },
+	{ DRM_MODE_CONTENT_PROTECTION_ENABLE,		"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
@@ -789,6 +796,13 @@ 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 4298171..7acb8b2 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 CP
+	 * 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 403339f..554a770 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -127,6 +127,11 @@ extern "C" {
 #define DRM_MODE_LINK_STATUS_GOOD	0
 #define DRM_MODE_LINK_STATUS_BAD	1
 
+/* Content Protection options */
+#define DRM_MODE_CONTENT_PROTECTION_UNSUPPORTED		0
+#define DRM_MODE_CONTENT_PROTECTION_DISABLE		1
+#define DRM_MODE_CONTENT_PROTECTION_ENABLE		2
+
 /*
  * DRM_MODE_ROTATE_<degrees>
  *
-- 
2.7.4