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drm/of: Make drm_of_find_panel_or_bridge() to check graph's presence 

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 <sam@ravnborg.org>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200701074232.13632-3-digetx@gmail.com
This commit is contained in:
Dmitry Osipenko 2020-07-01 10:42:32 +03:00 committed by Sam Ravnborg
parent 4ec0a44ba8
commit ea5bc3b15e
1 changed files with 9 additions and 0 deletions
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9
drivers/gpu/drm/drm_of.c
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@ -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;