drivers/gpu/drm/bridge/lvds-encoder.c:77: undefined reference to `devm_drm_panel_bridge_add'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   255442c93843f52b6891b21d0b485bf2c97f93c3
commit: dbb58bfd9ae6c885b2ca001a9a5ab8b881fb4ba9 drm/bridge: Fix lvds-encoder since the panel_bridge rework.
date:   9 weeks ago
config: x86_64-randconfig-s1-02011301 (attached as .config)
compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
reproduce:
        git checkout dbb58bfd9ae6c885b2ca001a9a5ab8b881fb4ba9
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/gpu/drm/bridge/lvds-encoder.o: In function `lvds_encoder_probe':
>> drivers/gpu/drm/bridge/lvds-encoder.c:77: undefined reference to `devm_drm_panel_bridge_add'

vim +77 drivers/gpu/drm/bridge/lvds-encoder.c

    34	
    35	static int lvds_encoder_probe(struct platform_device *pdev)
    36	{
    37		struct device_node *port;
    38		struct device_node *endpoint;
    39		struct device_node *panel_node;
    40		struct drm_panel *panel;
    41		struct lvds_encoder *lvds_encoder;
    42	
    43		lvds_encoder = devm_kzalloc(&pdev->dev, sizeof(*lvds_encoder),
    44					    GFP_KERNEL);
    45		if (!lvds_encoder)
    46			return -ENOMEM;
    47	
    48		/* Locate the panel DT node. */
    49		port = of_graph_get_port_by_id(pdev->dev.of_node, 1);
    50		if (!port) {
    51			dev_dbg(&pdev->dev, "port 1 not found\n");
    52			return -ENXIO;
    53		}
    54	
    55		endpoint = of_get_child_by_name(port, "endpoint");
    56		of_node_put(port);
    57		if (!endpoint) {
    58			dev_dbg(&pdev->dev, "no endpoint for port 1\n");
    59			return -ENXIO;
    60		}
    61	
    62		panel_node = of_graph_get_remote_port_parent(endpoint);
    63		of_node_put(endpoint);
    64		if (!panel_node) {
    65			dev_dbg(&pdev->dev, "no remote endpoint for port 1\n");
    66			return -ENXIO;
    67		}
    68	
    69		panel = of_drm_find_panel(panel_node);
    70		of_node_put(panel_node);
    71		if (!panel) {
    72			dev_dbg(&pdev->dev, "panel not found, deferring probe\n");
    73			return -EPROBE_DEFER;
    74		}
    75	
    76		lvds_encoder->panel_bridge =
  > 77			devm_drm_panel_bridge_add(&pdev->dev,
    78						  panel, DRM_MODE_CONNECTOR_LVDS);
    79		if (IS_ERR(lvds_encoder->panel_bridge))
    80			return PTR_ERR(lvds_encoder->panel_bridge);
    81	
    82		/* The panel_bridge bridge is attached to the panel's of_node,
    83		 * but we need a bridge attached to our of_node for our user
    84		 * to look up.
    85		 */
    86		lvds_encoder->bridge.of_node = pdev->dev.of_node;
    87		lvds_encoder->bridge.funcs = &funcs;
    88		drm_bridge_add(&lvds_encoder->bridge);
    89	
    90		platform_set_drvdata(pdev, lvds_encoder);
    91	
    92		return 0;
    93	}
    94	

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