Re: [1/8] drm/plane-helper: Move drm_plane_helper_atomic_check() into udl

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Hi,


On 2023/11/28 18:45, Thomas Zimmermann wrote:
The udl driver is the only caller of drm_plane_helper_atomic_check().
Move the function into the driver. No functional changes.

Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
  drivers/gpu/drm/drm_plane_helper.c | 32 ------------------------------
  drivers/gpu/drm/udl/udl_modeset.c  | 19 ++++++++++++++++--
  include/drm/drm_plane_helper.h     |  2 --
  3 files changed, 17 insertions(+), 36 deletions(-)

diff --git a/drivers/gpu/drm/drm_plane_helper.c b/drivers/gpu/drm/drm_plane_helper.c
index 5e95089676ff8..7982be4b0306d 100644
--- a/drivers/gpu/drm/drm_plane_helper.c
+++ b/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);


Since this function is removed, does the comments of the drm_crtc_helper_atomic_check()
function (in the drm_crtc_helper.c) need to update as well? I'm ask because I see the
comments of the drm_crtc_helper_atomic_check() still referencing this function.


diff --git a/drivers/gpu/drm/udl/udl_modeset.c b/drivers/gpu/drm/udl/udl_modeset.c
index 40876bcdd79a4..7702359c90c22 100644
--- a/drivers/gpu/drm/udl/udl_modeset.c
+++ b/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,
  };
diff --git a/include/drm/drm_plane_helper.h b/include/drm/drm_plane_helper.h
index 3a574e8cd22f4..75f9c4830564a 100644
--- a/include/drm/drm_plane_helper.h
+++ b/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




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