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authorRamalingam C <ramalingam.c@intel.com>2019-08-01 14:41:17 +0300
committerRamalingam C <ramalingam.c@intel.com>2019-08-06 10:47:23 +0300
commitbb5a45d40d50163df275c5a9578e19acdac361a2 (patch)
treef30f1756d12dacc8028dc92531824e615c98d74b /drivers/gpu/drm/drm_connector.c
parent6fe2ce064936efe5fbf2ce62c0b9be790d75189f (diff)
downloadlinux-bb5a45d40d50163df275c5a9578e19acdac361a2.tar.xz
drm/hdcp: update content protection property with uevent
drm function is defined and exported to update a connector's content protection property state and to generate a uevent along with it. Pekka have completed the Weston DRM-backend review in https://gitlab.freedesktop.org/wayland/weston/merge_requests/48 and the UAPI for HDCP 2.2 looks good. The userspace is accepted in Weston. 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@intel.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Acked-by: Pekka Paalanen <pekka.paalanen@collabora.com> Acked-by: Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/320963/?series=57232&rev=14
Diffstat (limited to 'drivers/gpu/drm/drm_connector.c')
-rw-r--r--drivers/gpu/drm/drm_connector.c17
1 files changed, 13 insertions, 4 deletions
diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index cddb97f75415..354798bad576 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -983,10 +983,19 @@ 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