drm/plane: Move drm_plane_enable_fb_damage_clips into core

We're trying to have a fairly strict split between core functionality
that defines the uapi, including the docs, and the helper functions to
implement it.

Move drm_plane_enable_fb_damage_clips and associated kerneldoc into
drm_plane from drm_damage_helper.c to fix this.
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Cc: José Roberto de Souza <jose.souza@intel.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210723083457.696939-3-daniel.vetter@ffwll.ch

Documentation/gpu/drm-kms.rst

@@ -537,8 +537,8 @@ Plane Composition Properties
 Damage Tracking Properties
 --------------------------
 
-.. kernel-doc:: drivers/gpu/drm/drm_damage_helper.c
-   :doc: overview
+.. kernel-doc:: drivers/gpu/drm/drm_plane.c
+   :doc: damage tracking
 
 Color Management Properties
 ---------------------------

drivers/gpu/drm/drm_damage_helper.c

@@ -34,44 +34,6 @@
 #include <drm/drm_damage_helper.h>
 #include <drm/drm_device.h>
 
-/**
- * DOC: overview
- *
- * FB_DAMAGE_CLIPS is an optional plane property which provides a means to
- * specify a list of damage rectangles on a plane in framebuffer coordinates of
- * the framebuffer attached to the plane. In current context damage is the area
- * of plane framebuffer that has changed since last plane update (also called
- * page-flip), irrespective of whether currently attached framebuffer is same as
- * framebuffer attached during last plane update or not.
- *
- * FB_DAMAGE_CLIPS is a hint to kernel which could be helpful for some drivers
- * to optimize internally especially for virtual devices where each framebuffer
- * change needs to be transmitted over network, usb, etc.
- *
- * Since FB_DAMAGE_CLIPS is a hint so it is an optional property. User-space can
- * ignore damage clips property and in that case driver will do a full plane
- * update. In case damage clips are provided then it is guaranteed that the area
- * inside damage clips will be updated to plane. For efficiency driver can do
- * full update or can update more than specified in damage clips. Since driver
- * is free to read more, user-space must always render the entire visible
- * framebuffer. Otherwise there can be corruptions. Also, if a user-space
- * provides damage clips which doesn't encompass the actual damage to
- * framebuffer (since last plane update) can result in incorrect rendering.
- *
- * FB_DAMAGE_CLIPS is a blob property with the layout of blob data is simply an
- * array of &drm_mode_rect. Unlike plane &drm_plane_state.src coordinates,
- * damage clips are not in 16.16 fixed point. Similar to plane src in
- * framebuffer, damage clips cannot be negative. In damage clip, x1/y1 are
- * inclusive and x2/y2 are exclusive. While kernel does not error for overlapped
- * damage clips, it is strongly discouraged.
- *
- * Drivers that are interested in damage interface for plane should enable
- * FB_DAMAGE_CLIPS property by calling drm_plane_enable_fb_damage_clips().
- * Drivers implementing damage can use drm_atomic_helper_damage_iter_init() and
- * drm_atomic_helper_damage_iter_next() helper iterator function to get damage
- * rectangles clipped to &drm_plane_state.src.
- */
-
 static void convert_clip_rect_to_rect(const struct drm_clip_rect *src,
 				      struct drm_mode_rect *dest,
 				      uint32_t num_clips, uint32_t src_inc)
@@ -87,22 +49,6 @@ static void convert_clip_rect_to_rect(const struct drm_clip_rect *src,
 	}
 }
 
-/**
- * drm_plane_enable_fb_damage_clips - Enables plane fb damage clips property.
- * @plane: Plane on which to enable damage clips property.
- *
- * This function lets driver to enable the damage clips property on a plane.
- */
-void drm_plane_enable_fb_damage_clips(struct drm_plane *plane)
-{
-	struct drm_device *dev = plane->dev;
-	struct drm_mode_config *config = &dev->mode_config;
-
-	drm_object_attach_property(&plane->base, config->prop_fb_damage_clips,
-				   0);
-}
-EXPORT_SYMBOL(drm_plane_enable_fb_damage_clips);
-
 /**
  * drm_atomic_helper_check_plane_damage - Verify plane damage on atomic_check.
  * @state: The driver state object.

drivers/gpu/drm/drm_plane.c

@@ -1397,6 +1397,60 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
 	return ret;
 }
 
+/**
+ * DOC: damage tracking
+ *
+ * FB_DAMAGE_CLIPS is an optional plane property which provides a means to
+ * specify a list of damage rectangles on a plane in framebuffer coordinates of
+ * the framebuffer attached to the plane. In current context damage is the area
+ * of plane framebuffer that has changed since last plane update (also called
+ * page-flip), irrespective of whether currently attached framebuffer is same as
+ * framebuffer attached during last plane update or not.
+ *
+ * FB_DAMAGE_CLIPS is a hint to kernel which could be helpful for some drivers
+ * to optimize internally especially for virtual devices where each framebuffer
+ * change needs to be transmitted over network, usb, etc.
+ *
+ * Since FB_DAMAGE_CLIPS is a hint so it is an optional property. User-space can
+ * ignore damage clips property and in that case driver will do a full plane
+ * update. In case damage clips are provided then it is guaranteed that the area
+ * inside damage clips will be updated to plane. For efficiency driver can do
+ * full update or can update more than specified in damage clips. Since driver
+ * is free to read more, user-space must always render the entire visible
+ * framebuffer. Otherwise there can be corruptions. Also, if a user-space
+ * provides damage clips which doesn't encompass the actual damage to
+ * framebuffer (since last plane update) can result in incorrect rendering.
+ *
+ * FB_DAMAGE_CLIPS is a blob property with the layout of blob data is simply an
+ * array of &drm_mode_rect. Unlike plane &drm_plane_state.src coordinates,
+ * damage clips are not in 16.16 fixed point. Similar to plane src in
+ * framebuffer, damage clips cannot be negative. In damage clip, x1/y1 are
+ * inclusive and x2/y2 are exclusive. While kernel does not error for overlapped
+ * damage clips, it is strongly discouraged.
+ *
+ * Drivers that are interested in damage interface for plane should enable
+ * FB_DAMAGE_CLIPS property by calling drm_plane_enable_fb_damage_clips().
+ * Drivers implementing damage can use drm_atomic_helper_damage_iter_init() and
+ * drm_atomic_helper_damage_iter_next() helper iterator function to get damage
+ * rectangles clipped to &drm_plane_state.src.
+ */
+
+/**
+ * drm_plane_enable_fb_damage_clips - Enables plane fb damage clips property.
+ * @plane: Plane on which to enable damage clips property.
+ *
+ * This function lets driver to enable the damage clips property on a plane.
+ */
+void drm_plane_enable_fb_damage_clips(struct drm_plane *plane)
+{
+	struct drm_device *dev = plane->dev;
+	struct drm_mode_config *config = &dev->mode_config;
+
+	drm_object_attach_property(&plane->base, config->prop_fb_damage_clips,
+				   0);
+}
+EXPORT_SYMBOL(drm_plane_enable_fb_damage_clips);
+
 /**
  * drm_plane_get_damage_clips_count - Returns damage clips count.
  * @state: Plane state.

include/drm/drm_damage_helper.h

@@ -64,7 +64,6 @@ struct drm_atomic_helper_damage_iter {
 	bool full_update;
 };
 
-void drm_plane_enable_fb_damage_clips(struct drm_plane *plane);
 void drm_atomic_helper_check_plane_damage(struct drm_atomic_state *state,
 					  struct drm_plane_state *plane_state);
 int drm_atomic_helper_dirtyfb(struct drm_framebuffer *fb,

include/drm/drm_plane.h

@@ -897,9 +897,10 @@ static inline struct drm_plane *drm_plane_find(struct drm_device *dev,
 
 bool drm_any_plane_has_format(struct drm_device *dev,
 			      u32 format, u64 modifier);
+
+void drm_plane_enable_fb_damage_clips(struct drm_plane *plane);
 unsigned int
 drm_plane_get_damage_clips_count(const struct drm_plane_state *state);
-
 struct drm_mode_rect *
 drm_plane_get_damage_clips(const struct drm_plane_state *state);