drm: add a path blob property

This property will be used by the MST code to provide userspace
with a path to parse so it can recognise connectors around hotplugs.

Reviewed-by: Todd Previte <tprevite@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index f939b058953c..bd7422676638 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -1257,6 +1257,7 @@ static int drm_mode_create_standard_connector_properties(struct drm_device *dev)
 {
         struct drm_property *edid;
         struct drm_property *dpms;
+        struct drm_property *dev_path;
 
         /*
          * Standard properties (apply to all connectors)
@@ -1271,6 +1272,12 @@ static int drm_mode_create_standard_connector_properties(struct drm_device *dev)
                                    ARRAY_SIZE(drm_dpms_enum_list));
         dev->mode_config.dpms_property = dpms;
 
+        dev_path = drm_property_create(dev,
+                                       DRM_MODE_PROP_BLOB |
+                                       DRM_MODE_PROP_IMMUTABLE,
+                                       "PATH", 0);
+        dev->mode_config.path_property = dev_path;
+
         return 0;
 }
 
@@ -3755,6 +3762,25 @@ done:
         return ret;
 }
 
+int drm_mode_connector_set_path_property(struct drm_connector *connector,
+                                         char *path)
+{
+        struct drm_device *dev = connector->dev;
+        int ret, size;
+        size = strlen(path) + 1;
+
+        connector->path_blob_ptr = drm_property_create_blob(connector->dev,
+                                                            size, path);
+        if (!connector->path_blob_ptr)
+                return -EINVAL;
+
+        ret = drm_object_property_set_value(&connector->base,
+                                            dev->mode_config.path_property,
+                                            connector->path_blob_ptr->base.id);
+        return ret;
+}
+EXPORT_SYMBOL(drm_mode_connector_set_path_property);
+
 /**
  * drm_mode_connector_update_edid_property - update the edid property of a connector
  * @connector: drm connector