[PATCH v5 09/12] drm/hdcp: update content protection property with uevent

[Ramalingam C]

drm function is defined and exported to update a connector's
content protection property state and to generate a uevent along
with it.

v2:
  Update only when state is different from old one.

Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
---
 drivers/gpu/drm/drm_hdcp.c | 16 ++++++++++++++++
 include/drm/drm_hdcp.h     |  2 ++
 2 files changed, 18 insertions(+)

diff --git a/drivers/gpu/drm/drm_hdcp.c b/drivers/gpu/drm/drm_hdcp.c
index a0960507e4ff..5640c4e744fe 100644
--- a/drivers/gpu/drm/drm_hdcp.c
+++ b/drivers/gpu/drm/drm_hdcp.c
@@ -415,3 +415,19 @@ int drm_connector_attach_content_protection_property(
 	return 0;
 }
 EXPORT_SYMBOL(drm_connector_attach_content_protection_property);
+
+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 145c81ba1e09..9457c7ec0d37 100644
--- a/include/drm/drm_hdcp.h
+++ b/include/drm/drm_hdcp.h
@@ -304,4 +304,6 @@ struct drm_connector;
 bool drm_hdcp_ksvs_revocated(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