Create and export an helper to display plane type using the
property string. This could be used to display debug
information in VKMS.

Reviewed-by: José Expósito <jose.exposito@redhat.com>
Signed-off-by: Louis Chauvet <louis.chauvet@bootlin.com>
---
 drivers/gpu/drm/drm_mode_config.c | 16 ++++++++++++++++
 include/drm/drm_mode_config.h     |  3 +++
 2 files changed, 19 insertions(+)

diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c
index d12db9b0bab8..c940a67e255b 100644
--- a/drivers/gpu/drm/drm_mode_config.c
+++ b/drivers/gpu/drm/drm_mode_config.c
@@ -231,6 +231,22 @@ static const struct drm_prop_enum_list drm_plane_type_enum_list[] = {
 	{ DRM_PLANE_TYPE_CURSOR, "Cursor" },
 };
 
+/**
+ * drm_get_plane_type_name - return a string for plane name
+ * @type: plane type to compute name of
+ *
+ * Returns: The name of the plane type. "(unknown)" if type is not a known
+ * plane type.
+ */
+const char *drm_get_plane_type_name(enum drm_plane_type type)
+{
+	if (type > 0 && type < ARRAY_SIZE(drm_plane_type_enum_list))
+		return drm_plane_type_enum_list[type].name;
+	else
+		return "(unknown)";
+}
+EXPORT_SYMBOL(drm_get_plane_type_name);
+
 static int drm_mode_create_standard_properties(struct drm_device *dev)
 {
 	struct drm_property *prop;
diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
index 895fb820dba0..f4c580fa2a52 100644
--- a/include/drm/drm_mode_config.h
+++ b/include/drm/drm_mode_config.h
@@ -30,6 +30,7 @@
 #include <linux/llist.h>
 
 #include <drm/drm_modeset_lock.h>
+#include <drm/drm_plane.h>
 
 struct drm_file;
 struct drm_device;
@@ -1001,4 +1002,6 @@ static inline int drm_mode_config_init(struct drm_device *dev)
 void drm_mode_config_reset(struct drm_device *dev);
 void drm_mode_config_cleanup(struct drm_device *dev);
 
+const char *drm_get_plane_type_name(enum drm_plane_type type);
+
 #endif

-- 
2.51.2

On Mon Dec 22, 2025 at 11:11 AM CET, Louis Chauvet wrote:
> Create and export an helper to display plane type using the
> property string. This could be used to display debug
> information in VKMS.
>
> Reviewed-by: José Expósito <jose.exposito@redhat.com>
> Signed-off-by: Louis Chauvet <louis.chauvet@bootlin.com>
> ---
>  drivers/gpu/drm/drm_mode_config.c | 16 ++++++++++++++++
>  include/drm/drm_mode_config.h     |  3 +++
>  2 files changed, 19 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c
> index d12db9b0bab8..c940a67e255b 100644
> --- a/drivers/gpu/drm/drm_mode_config.c
> +++ b/drivers/gpu/drm/drm_mode_config.c
> @@ -231,6 +231,22 @@ static const struct drm_prop_enum_list drm_plane_type_enum_list[] = {
>  	{ DRM_PLANE_TYPE_CURSOR, "Cursor" },
>  };
>
> +/**
> + * drm_get_plane_type_name - return a string for plane name
> + * @type: plane type to compute name of
> + *
> + * Returns: The name of the plane type. "(unknown)" if type is not a known
> + * plane type.
> + */
> +const char *drm_get_plane_type_name(enum drm_plane_type type)
> +{
> +	if (type > 0 && type < ARRAY_SIZE(drm_plane_type_enum_list))
This should be:  >= 0

With that fixed:

 Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>

--
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com