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

[Sui Jingfeng]

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 at suse.de>
> ---
>   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