[PATCH v3 02/10] drm: Add Content protection type property

Ramalingam C
2019-03-22T00:44:40Z

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]
v3:
%s/content_protection_type/hdcp_content_type [Pekka]

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..857ca6fa6fd0 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->hdcp_content_type_property) {
+ state->hdcp_content_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->hdcp_content_type_property) {
+ *val = state->hdcp_content_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 2355124849db..ff61c3208307 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -857,6 +857,13 @@ 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_hdcp_content_type_enum_list[] = {
+ { DRM_MODE_HDCP_CONTENT_TYPE0, "HDCP Type0" },
+ { DRM_MODE_HDCP_CONTENT_TYPE1, "HDCP Type1" },
+};
+DRM_ENUM_NAME_FN(drm_get_hdcp_content_type_name,
+ drm_hdcp_content_type_enum_list)
+
/**
* DOC: standard connector properties
*
@@ -962,6 +969,23 @@ 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).
+ * HDCP Content 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 HDCP Type0 or HDCP Type1.
+ *
+ * The value of the property can be one the below:
+ * - DRM_MODE_HDCP_CONTENT_TYPE0 = 0
+ * HDCP Type0 streams can be transmitted on a link which is
+ * encrypted with HDCP 1.4 or HDCP 2.2.
+ * - DRM_MODE_HDCP_CONTENT_TYPE1 = 1
+ * HDCP Type1 streams can be transmitted on a link which is
+ * encrypted only with HDCP 2.2.
+ *
+ * Please note this content type is introduced at HDCP 2.2 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
@@ -1551,6 +1575,45 @@ int drm_connector_attach_content_protection_property(
}
EXPORT_SYMBOL(drm_connector_attach_content_protection_property);

+/**
+ * drm_connector_attach_hdcp_content_type_property - attach HDCP
+ * content type property
+ *
+ * @connector: connector to attach HDCP content 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 HDCP 2.2 authentication.
+ *
+ * Content type will be set to &drm_connector_state.hdcp_content_type.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int
+drm_connector_attach_hdcp_content_type_property(struct drm_connector *
+ connector)
+{
+ struct drm_device *dev = connector->dev;
+ struct drm_property *prop;
+
+ prop = drm_property_create_enum(dev, 0, "HDCP Content Type",
+ drm_hdcp_content_type_enum_list,
+ ARRAY_SIZE(
+ drm_hdcp_content_type_enum_list));
+ if (!prop)
+ return -ENOMEM;
+
+ drm_object_attach_property(&connector->base, prop,
+ DRM_MODE_HDCP_CONTENT_TYPE0);
+ connector->hdcp_content_type_property = prop;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_connector_attach_hdcp_content_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..f0830985367f 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;

+ /**
+ * @hdcp_content_type: Connector property to pass the type of
+ * protected content. This is most commonly used for HDCP.
+ */
+ unsigned int hdcp_content_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;

+ /**
+ * @hdcp_content_type_property: DRM ENUM property for type of
+ * Protected Content.
+ */
+ struct drm_property *hdcp_content_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_hdcp_content_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_hdcp_content_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..44412e8b77cd 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_HDCP_CONTENT_TYPE0 0
+#define DRM_MODE_HDCP_CONTENT_TYPE1 1
+
struct drm_mode_modeinfo {
__u32 clock;
__u16 hdisplay;
--
2.19.1