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