[PATCH v2 2/8] drm: Add Content protection type property

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

This patch adds a DRM ENUM property to the selected connectors.
This property is used for mentioning the protected content's type
from userspace to kernel HDCP authentication.

Type of the stream is decided by the protected content providers.
Type 0 content can be rendered on any HDCP protected display wires.
But Type 1 content can be rendered only on HDCP2.2 protected paths.

So when a userspace sets this property to Type 1 and starts the HDCP
enable, kernel will honour it only if HDCP2.2 authentication is through
for type 1. Else HDCP enable will be failed.

v2:
  cp_content_type is replaced with content_protection_type [daniel]
  check at atomic_set_property is removed [Maarten]

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
---
 drivers/gpu/drm/drm_atomic_uapi.c |  4 ++
 drivers/gpu/drm/drm_connector.c   | 63 +++++++++++++++++++++++++++++++
 include/drm/drm_connector.h       | 15 ++++++++
 include/uapi/drm/drm_mode.h       |  4 ++
 4 files changed, 86 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
index 4eb81f10bc54..f383d4be5a92 100644
--- a/drivers/gpu/drm/drm_atomic_uapi.c
+++ b/drivers/gpu/drm/drm_atomic_uapi.c
@@ -746,6 +746,8 @@ static int drm_atomic_connector_set_property(struct drm_connector *connector,
 			return -EINVAL;
 		}
 		state->content_protection = val;
+	} else if (property == connector->content_protection_type_property) {
+		state->content_protection_type = val;
 	} else if (property == connector->colorspace_property) {
 		state->colorspace = val;
 	} else if (property == config->writeback_fb_id_property) {
@@ -822,6 +824,8 @@ drm_atomic_connector_get_property(struct drm_connector *connector,
 		*val = state->scaling_mode;
 	} else if (property == connector->content_protection_property) {
 		*val = state->content_protection;
+	} else if (property == connector->content_protection_type_property) {
+		*val = state->content_protection_type;
 	} else if (property == config->writeback_fb_id_property) {
 		/* Writeback framebuffer is one-shot, write and forget */
 		*val = 0;
diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index 07d65a16c623..4ce0830e9fb4 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -853,6 +853,13 @@ static const struct drm_prop_enum_list hdmi_colorspaces[] = {
 	{ DRM_MODE_COLORIMETRY_DCI_P3_RGB_THEATER, "DCI-P3_RGB_Theater" },
 };
 
+static struct drm_prop_enum_list drm_content_protection_type_enum_list[] = {
+	{ DRM_MODE_CONTENT_PROTECTION_TYPE0, "Type 0" },
+	{ DRM_MODE_CONTENT_PROTECTION_TYPE1, "Type 1" },
+};
+DRM_ENUM_NAME_FN(drm_get_content_protection_type_name,
+		 drm_content_protection_type_enum_list)
+
 /**
  * DOC: standard connector properties
  *
@@ -958,6 +965,23 @@ static const struct drm_prop_enum_list hdmi_colorspaces[] = {
  *	  the value transitions from ENABLED to DESIRED. This signifies the link
  *	  is no longer protected and userspace should take appropriate action
  *	  (whatever that might be).
+ * Content_protection_type:
+ *	This property is used by the userspace to configure the kernel with
+ *	upcoming stream's content type. Content Type of a stream is decided by
+ *	the owner of the stream, as Type 0 or Type 1.
+ *
+ *	The value of the property can be one the below:
+ *	  - DRM_MODE_CONTENT_PROTECTION_TYPE0 = 0
+ *		Type 0 streams can be transmitted on a link which is encrypted
+ *		with HDCP 1.4 or HDCP 2.2.
+ *	  - DRM_MODE_CONTENT_PROTECTION_TYPE1 = 1
+ *		Type 1 streams can be transmitted on a link which is encrypted
+ *		only with HDCP2.2.
+ *
+ *	Please note this content type is introduced at HDCP2.2 and used in its
+ *	authentication process. If content type is changed when
+ *	content_protection is not UNDESIRED, then kernel will disable the HDCP
+ *	and re-enable with new type in the same atomic commit
  *
  * max bpc:
  *	This range property is used by userspace to limit the bit depth. When
@@ -1547,6 +1571,45 @@ int drm_connector_attach_content_protection_property(
 }
 EXPORT_SYMBOL(drm_connector_attach_content_protection_property);
 
+/**
+ * drm_connector_attach_content_protection_type_property - attach content
+ * protection type property
+ *
+ * @connector: connector to attach content protection type property on.
+ *
+ * This is used to add support for sending the protected content's stream type
+ * from userspace to kernel on selected connectors. Protected content provider
+ * will decide their type of their content and declare the same to kernel.
+ *
+ * This information will be used during the HDCP2.2 authentication.
+ *
+ * Content type will be set to &drm_connector_state.content_protection_type.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int
+drm_connector_attach_content_protection_type_property(struct drm_connector *
+						      connector)
+{
+	struct drm_device *dev = connector->dev;
+	struct drm_property *prop;
+
+	prop = drm_property_create_enum(dev, 0, "Content_protection_type",
+					drm_content_protection_type_enum_list,
+					ARRAY_SIZE(
+					drm_content_protection_type_enum_list));
+	if (!prop)
+		return -ENOMEM;
+
+	drm_object_attach_property(&connector->base, prop,
+				   DRM_MODE_CONTENT_PROTECTION_TYPE0);
+	connector->content_protection_type_property = prop;
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_connector_attach_content_protection_type_property);
+
 /**
  * drm_mode_create_aspect_ratio_property - create aspect ratio property
  * @dev: DRM device
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index c8061992d6cb..2116732789ec 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -518,6 +518,12 @@ struct drm_connector_state {
 	 */
 	unsigned int content_type;
 
+	/**
+	 * @content_protection_type: Connector property to pass the type of
+	 * protected content. This is most commonly used for HDCP.
+	 */
+	unsigned int content_protection_type;
+
 	/**
 	 * @scaling_mode: Connector property to control the
 	 * upscaling, mostly used for built-in panels.
@@ -1035,6 +1041,12 @@ struct drm_connector {
 	 */
 	struct drm_property *colorspace_property;
 
+	/**
+	 * @content_protection_type_property: DRM ENUM property for type of
+	 * Protected Content.
+	 */
+	struct drm_property *content_protection_type_property;
+
 	/**
 	 * @path_blob_ptr:
 	 *
@@ -1294,6 +1306,7 @@ const char *drm_get_dvi_i_select_name(int val);
 const char *drm_get_tv_subconnector_name(int val);
 const char *drm_get_tv_select_name(int val);
 const char *drm_get_content_protection_name(int val);
+const char *drm_get_content_protection_type_name(int val);
 
 int drm_mode_create_dvi_i_properties(struct drm_device *dev);
 int drm_mode_create_tv_margin_properties(struct drm_device *dev);
@@ -1309,6 +1322,8 @@ int drm_connector_attach_vrr_capable_property(
 		struct drm_connector *connector);
 int drm_connector_attach_content_protection_property(
 		struct drm_connector *connector);
+int drm_connector_attach_content_protection_type_property(
+		struct drm_connector *connector);
 int drm_mode_create_aspect_ratio_property(struct drm_device *dev);
 int drm_mode_create_colorspace_property(struct drm_connector *connector);
 int drm_mode_create_content_type_property(struct drm_device *dev);
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index a439c2e67896..65b4e4d8fdfb 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -210,6 +210,10 @@ extern "C" {
 #define DRM_MODE_CONTENT_PROTECTION_DESIRED     1
 #define DRM_MODE_CONTENT_PROTECTION_ENABLED     2
 
+/* Content Type classification for HDCP2.2 vs others */
+#define DRM_MODE_CONTENT_PROTECTION_TYPE0		0
+#define DRM_MODE_CONTENT_PROTECTION_TYPE1		1
+
 struct drm_mode_modeinfo {
 	__u32 clock;
 	__u16 hdisplay;
-- 
2.19.1

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