drm/plane-helper: Move drm_plane_helper_atomic_check() into udl

The udl driver is the only caller of drm_plane_helper_atomic_check().
Move the function into the driver. No functional changes.

v2:
	* fix documenation (Sui)
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Sui Jingfeng <suijingfeng@loongson.cn>
Link: https://patchwork.freedesktop.org/patch/msgid/20231204090852.1650-2-tzimmermann@suse.de

drivers/gpu/drm/drm_crtc_helper.c

@@ -439,11 +439,8 @@ EXPORT_SYMBOL(drm_crtc_helper_set_mode);
  * @state: atomic state object
  *
  * Provides a default CRTC-state check handler for CRTCs that only have
- * one primary plane attached to it.
- *
- * This is often the case for the CRTC of simple framebuffers. See also
- * drm_plane_helper_atomic_check() for the respective plane-state check
- * helper function.
+ * one primary plane attached to it. This is often the case for the CRTC
+ * of simple framebuffers.
  *
  * RETURNS:
  * Zero on success, or an errno code otherwise.

drivers/gpu/drm/drm_plane_helper.c

@@ -279,35 +279,3 @@ void drm_plane_helper_destroy(struct drm_plane *plane)
 	kfree(plane);
 }
 EXPORT_SYMBOL(drm_plane_helper_destroy);
-
-/**
- * drm_plane_helper_atomic_check() - Helper to check plane atomic-state
- * @plane: plane to check
- * @state: atomic state object
- *
- * Provides a default plane-state check handler for planes whose atomic-state
- * scale and positioning are not expected to change since the plane is always
- * a fullscreen scanout buffer.
- *
- * This is often the case for the primary plane of simple framebuffers. See
- * also drm_crtc_helper_atomic_check() for the respective CRTC-state check
- * helper function.
- *
- * RETURNS:
- * Zero on success, or an errno code otherwise.
- */
-int drm_plane_helper_atomic_check(struct drm_plane *plane, struct drm_atomic_state *state)
-{
-	struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
-	struct drm_crtc *new_crtc = new_plane_state->crtc;
-	struct drm_crtc_state *new_crtc_state = NULL;
-
-	if (new_crtc)
-		new_crtc_state = drm_atomic_get_new_crtc_state(state, new_crtc);
-
-	return drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state,
-						   DRM_PLANE_NO_SCALING,
-						   DRM_PLANE_NO_SCALING,
-						   false, false);
-}
-EXPORT_SYMBOL(drm_plane_helper_atomic_check);

drivers/gpu/drm/udl/udl_modeset.c

@@ -21,7 +21,6 @@
 #include <drm/drm_gem_framebuffer_helper.h>
 #include <drm/drm_gem_shmem_helper.h>
 #include <drm/drm_modeset_helper_vtables.h>
-#include <drm/drm_plane_helper.h>
 #include <drm/drm_probe_helper.h>
 #include <drm/drm_vblank.h>
 
@@ -261,6 +260,22 @@ static const uint64_t udl_primary_plane_fmtmods[] = {
 	DRM_FORMAT_MOD_INVALID
 };
 
+static int udl_primary_plane_helper_atomic_check(struct drm_plane *plane,
+						 struct drm_atomic_state *state)
+{
+	struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
+	struct drm_crtc *new_crtc = new_plane_state->crtc;
+	struct drm_crtc_state *new_crtc_state = NULL;
+
+	if (new_crtc)
+		new_crtc_state = drm_atomic_get_new_crtc_state(state, new_crtc);
+
+	return drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state,
+						   DRM_PLANE_NO_SCALING,
+						   DRM_PLANE_NO_SCALING,
+						   false, false);
+}
+
 static void udl_primary_plane_helper_atomic_update(struct drm_plane *plane,
 						   struct drm_atomic_state *state)
 {
@@ -296,7 +311,7 @@ static void udl_primary_plane_helper_atomic_update(struct drm_plane *plane,
 
 static const struct drm_plane_helper_funcs udl_primary_plane_helper_funcs = {
 	DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
-	.atomic_check = drm_plane_helper_atomic_check,
+	.atomic_check = udl_primary_plane_helper_atomic_check,
 	.atomic_update = udl_primary_plane_helper_atomic_update,
 };
 

include/drm/drm_plane_helper.h

@@ -26,7 +26,6 @@
 
 #include <linux/types.h>
 
-struct drm_atomic_state;
 struct drm_crtc;
 struct drm_framebuffer;
 struct drm_modeset_acquire_ctx;
@@ -42,7 +41,6 @@ int drm_plane_helper_update_primary(struct drm_plane *plane, struct drm_crtc *cr
 int drm_plane_helper_disable_primary(struct drm_plane *plane,
 				     struct drm_modeset_acquire_ctx *ctx);
 void drm_plane_helper_destroy(struct drm_plane *plane);
-int drm_plane_helper_atomic_check(struct drm_plane *plane, struct drm_atomic_state *state);
 
 /**
  * DRM_PLANE_NON_ATOMIC_FUNCS - Default plane functions for non-atomic drivers