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drm/panic: Add drm_panic_is_enabled()
It allows to check if the drm device supports drm_panic. Prepare the work to have better integration with fbcon and vtconsole. Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20240717090102.968152-2-jfalempe@redhat.com
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@ -317,4 +317,11 @@ drm_edid_load_firmware(struct drm_connector *connector)
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}
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#endif
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/* drm_panic.c */
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#ifdef CONFIG_DRM_PANIC
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bool drm_panic_is_enabled(struct drm_device *dev);
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#else
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bool drm_panic_is_enabled(struct drm_device *dev) {return false; }
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#endif
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#endif /* __DRM_CRTC_INTERNAL_H__ */
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@ -703,6 +703,26 @@ static void debugfs_register_plane(struct drm_plane *plane, int index)
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static void debugfs_register_plane(struct drm_plane *plane, int index) {}
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#endif /* CONFIG_DRM_PANIC_DEBUG */
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/**
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* drm_panic_is_enabled
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* @dev: the drm device that may supports drm_panic
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*
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* returns true if the drm device supports drm_panic
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*/
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bool drm_panic_is_enabled(struct drm_device *dev)
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{
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struct drm_plane *plane;
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if (!dev->mode_config.num_total_plane)
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return false;
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drm_for_each_plane(plane, dev)
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if (plane->helper_private && plane->helper_private->get_scanout_buffer)
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return true;
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return false;
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}
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EXPORT_SYMBOL(drm_panic_is_enabled);
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/**
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* drm_panic_register() - Initialize DRM panic for a device
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* @dev: the drm device on which the panic screen will be displayed.
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