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@xxxxxxxxxx>
---
drivers/gpu/drm/drm_panic.c | 20 ++++++++++++++++++++
include/drm/drm_panic.h | 2 ++
2 files changed, 22 insertions(+)
diff --git a/drivers/gpu/drm/drm_panic.c b/drivers/gpu/drm/drm_panic.c
index 948aed00595e..d9a25c2d0a65 100644
--- a/drivers/gpu/drm/drm_panic.c
+++ b/drivers/gpu/drm/drm_panic.c
@@ -703,6 +703,26 @@ static void debugfs_register_plane(struct drm_plane *plane, int index)
static void debugfs_register_plane(struct drm_plane *plane, int index) {}
#endif /* CONFIG_DRM_PANIC_DEBUG */
+/**
+ * drm_panic_is_enabled
+ * @dev: the drm device that may supports drm_panic
+ *
+ * returns true if the drm device supports drm_panic
+ */
+bool drm_panic_is_enabled(struct drm_device *dev)
+{
+ struct drm_plane *plane;
+
+ if (!dev->mode_config.num_total_plane)
+ return false;
+
+ drm_for_each_plane(plane, dev)
+ if (plane->helper_private && plane->helper_private->get_scanout_buffer)
+ return true;
+ return false;
+}
+EXPORT_SYMBOL(drm_panic_is_enabled);
+
/**
* drm_panic_register() - Initialize DRM panic for a device
* @dev: the drm device on which the panic screen will be displayed.
diff --git a/include/drm/drm_panic.h b/include/drm/drm_panic.h
index 73bb3f3d9ed9..c3a358dc3e27 100644
--- a/include/drm/drm_panic.h
+++ b/include/drm/drm_panic.h
@@ -148,11 +148,13 @@ struct drm_scanout_buffer {
#ifdef CONFIG_DRM_PANIC
+bool drm_panic_is_enabled(struct drm_device *dev);
void drm_panic_register(struct drm_device *dev);
void drm_panic_unregister(struct drm_device *dev);
#else
+bool drm_panic_is_enabled(struct drm_device *dev) {return false; }
static inline void drm_panic_register(struct drm_device *dev) {}
static inline void drm_panic_unregister(struct drm_device *dev) {}
--
2.45.2
