When graph isn't defined in a device-tree, the of_graph_get_remote_node()
prints a noisy error message, telling that port node is not found. This is
undesirable behaviour in our case because absence of a panel/bridge graph
is a valid case. Let's check the graph's presence in a device-tree before
proceeding with parsing of the graph.

Reviewed-by: Sam Ravnborg <s...@ravnborg.org>
Signed-off-by: Dmitry Osipenko <dig...@gmail.com>
---
 drivers/gpu/drm/drm_of.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c
index b50b44e76279..fdb05fbf72a0 100644
--- a/drivers/gpu/drm/drm_of.c
+++ b/drivers/gpu/drm/drm_of.c
@@ -246,6 +246,15 @@ int drm_of_find_panel_or_bridge(const struct device_node 
*np,
        if (panel)
                *panel = NULL;
 
+       /*
+        * of_graph_get_remote_node() produces a noisy error message if port
+        * node isn't found and the absence of the port is a legit case here,
+        * so at first we silently check whether graph presents in the
+        * device-tree node.
+        */
+       if (!of_graph_is_present(np))
+               return -ENODEV;
+
        remote = of_graph_get_remote_node(np, port, endpoint);
        if (!remote)
                return -ENODEV;
-- 
2.26.0

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