drm function is defined and exported to update a connector's
content protection property state and to generate a uevent along
with it.
Need ACK for the uevent from userspace consumer.
v2:
Update only when state is different from old one.
v3:
KDoc is added [Daniel]
v4:
KDoc is extended bit more [pekka]
v5:
Uevent usage is documented at kdoc of "Content Protection" also
[pekka]
Signed-off-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
---
drivers/gpu/drm/drm_connector.c | 17 +++++++++++++----
drivers/gpu/drm/drm_hdcp.c | 34 +++++++++++++++++++++++++++++++++
include/drm/drm_hdcp.h | 2 ++
3 files changed, 49 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index fefd36a1c4c9..1a8b254fe5de 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -947,10 +947,19 @@ static const struct drm_prop_enum_list hdmi_colorspaces[] = {
* - If the state is DESIRED, kernel should attempt to re-authenticate the
* link whenever possible. This includes across disable/enable, dpms,
* hotplug, downstream device changes, link status failures, etc..
- * - Userspace is responsible for polling the property to determine when
- * 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).
+ * - Kernel sends uevent with the connector id and property id through
+ * @drm_hdcp_update_content_protection, upon below kernel triggered
+ * scenarios:
+ * DESIRED -> ENABLED (authentication success)
+ * ENABLED -> DESIRED (termination of authentication)
+ * - Please note no uevents for userspace triggered property state changes,
+ * which can't fail such as
+ * DESIRED/ENABLED -> UNDESIRED
+ * UNDESIRED -> DESIRED
+ * - Userspace is responsible for polling the property or listen to uevents
+ * to determine when 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 Enum property is used by the userspace to declare the content type
diff --git a/drivers/gpu/drm/drm_hdcp.c b/drivers/gpu/drm/drm_hdcp.c
index ce235fd1c844..77433ee3d652 100644
--- a/drivers/gpu/drm/drm_hdcp.c
+++ b/drivers/gpu/drm/drm_hdcp.c
@@ -374,6 +374,10 @@ DRM_ENUM_NAME_FN(drm_get_hdcp_content_type_name,
*
* The content protection will be set to &drm_connector_state.content_protection
*
+ * When kernel triggered content protection state change like DESIRED->ENABLED
+ * and ENABLED->DESIRED, will use drm_hdcp_update_content_protection() to update
+ * the content protection state of a connector.
+ *
* Returns:
* Zero on success, negative errno on failure.
*/
@@ -414,3 +418,33 @@ int drm_connector_attach_content_protection_property(
return 0;
}
EXPORT_SYMBOL(drm_connector_attach_content_protection_property);
+
+/**
+ * drm_hdcp_update_content_protection - Updates the content protection state
+ * of a connector
+ *
+ * @connector: drm_connector on which content protection state needs an update
+ * @val: New state of the content protection property
+ *
+ * This function can be used by display drivers, to update the kernel triggered
+ * content protection state changes of a drm_connector such as DESIRED->ENABLED
+ * and ENABLED->DESIRED. No uevent for DESIRED->UNDESIRED or ENABLED->UNDESIRED,
+ * as userspace is triggering such state change and kernel performs it without
+ * fail.This function update the new state of the property into the connector's
+ * state and generate an uevent to notify the userspace.
+ */
+void drm_hdcp_update_content_protection(struct drm_connector *connector,
+ u64 val)
+{
+ struct drm_device *dev = connector->dev;
+ struct drm_connector_state *state = connector->state;
+
+ WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
+ if (state->content_protection == val)
+ return;
+
+ state->content_protection = val;
+ drm_sysfs_connector_status_event(connector,
+ dev->mode_config.content_protection_property);
+}
+EXPORT_SYMBOL(drm_hdcp_update_content_protection);
diff --git a/include/drm/drm_hdcp.h b/include/drm/drm_hdcp.h
index 2970abdfaf12..dd864ac9ce85 100644
--- a/include/drm/drm_hdcp.h
+++ b/include/drm/drm_hdcp.h
@@ -292,4 +292,6 @@ bool drm_hdcp_check_ksvs_revoked(struct drm_device *dev,
u8 *ksvs, u32 ksv_count);
int drm_connector_attach_content_protection_property(
struct drm_connector *connector, bool hdcp_content_type);
+void drm_hdcp_update_content_protection(struct drm_connector *connector,
+ u64 val);
#endif
--
2.19.1
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