diff options
Diffstat (limited to 'drivers/gpu/drm/drm_panel.c')
| -rw-r--r-- | drivers/gpu/drm/drm_panel.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c index 965530a6f4cd..b902361dee6e 100644 --- a/drivers/gpu/drm/drm_panel.c +++ b/drivers/gpu/drm/drm_panel.c @@ -151,12 +151,19 @@ EXPORT_SYMBOL(drm_panel_detach); * tree node. If a matching panel is found, return a pointer to it. * * Return: A pointer to the panel registered for the specified device tree - * node or NULL if no panel matching the device tree node can be found. + * node or an ERR_PTR() if no panel matching the device tree node can be found. + * Possible error codes returned by this function: + * - EPROBE_DEFER: the panel device has not been probed yet, and the caller + * should retry later + * - ENODEV: the device is not available (status != "okay" or "ok") */ struct drm_panel *of_drm_find_panel(const struct device_node *np) { struct drm_panel *panel; + if (!of_device_is_available(np)) + return ERR_PTR(-ENODEV); + mutex_lock(&panel_lock); list_for_each_entry(panel, &panel_list, list) { @@ -167,7 +174,7 @@ struct drm_panel *of_drm_find_panel(const struct device_node *np) } mutex_unlock(&panel_lock); - return NULL; + return ERR_PTR(-EPROBE_DEFER); } EXPORT_SYMBOL(of_drm_find_panel); #endif |
