include/drm/drm_atomic_helper.h - third_party/linux - Git at Google

 /*
  * Copyright (C) 2014 Red Hat
  * Copyright (C) 2014 Intel Corp.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction, including without limitation
  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  * and/or sell copies of the Software, and to permit persons to whom the
  * Software is furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  * OTHER DEALINGS IN THE SOFTWARE.
  *
  * Authors:
  * Rob Clark <robdclark@gmail.com>
  * Daniel Vetter <daniel.vetter@ffwll.ch>
  */

 #ifndef DRM_ATOMIC_HELPER_H_
 #define DRM_ATOMIC_HELPER_H_

 #include <drm/drm_crtc.h>
 #include <drm/drm_modeset_helper_vtables.h>
 #include <drm/drm_modeset_helper.h>

 struct drm_atomic_state;
 struct drm_private_obj;
 struct drm_private_state;

 int drm_atomic_helper_check_modeset(struct drm_device *dev,
 				struct drm_atomic_state *state);
 int drm_atomic_helper_check_plane_state(struct drm_plane_state *plane_state,
 					const struct drm_crtc_state *crtc_state,
 					int min_scale,
 					int max_scale,
 					bool can_position,
 					bool can_update_disabled);
 int drm_atomic_helper_check_planes(struct drm_device *dev,
 			       struct drm_atomic_state *state);
 int drm_atomic_helper_check(struct drm_device *dev,
 			    struct drm_atomic_state *state);
 void drm_atomic_helper_commit_tail(struct drm_atomic_state *state);
 void drm_atomic_helper_commit_tail_rpm(struct drm_atomic_state *state);
 int drm_atomic_helper_commit(struct drm_device *dev,
 			     struct drm_atomic_state *state,
 			     bool nonblock);
 int drm_atomic_helper_async_check(struct drm_device *dev,
 				  struct drm_atomic_state *state);
 void drm_atomic_helper_async_commit(struct drm_device *dev,
 				    struct drm_atomic_state *state);

 int drm_atomic_helper_wait_for_fences(struct drm_device *dev,
 					struct drm_atomic_state *state,
 					bool pre_swap);

 void drm_atomic_helper_wait_for_vblanks(struct drm_device *dev,
 					struct drm_atomic_state *old_state);

 void drm_atomic_helper_wait_for_flip_done(struct drm_device *dev,
 					  struct drm_atomic_state *old_state);

 void
 drm_atomic_helper_update_legacy_modeset_state(struct drm_device *dev,
 					      struct drm_atomic_state *old_state);

 void drm_atomic_helper_commit_modeset_disables(struct drm_device *dev,
 					       struct drm_atomic_state *state);
 void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
 					  struct drm_atomic_state *old_state);

 int drm_atomic_helper_prepare_planes(struct drm_device *dev,
 				     struct drm_atomic_state *state);

 #define DRM_PLANE_COMMIT_ACTIVE_ONLY			BIT(0)
 #define DRM_PLANE_COMMIT_NO_DISABLE_AFTER_MODESET	BIT(1)

 void drm_atomic_helper_commit_planes(struct drm_device *dev,
 				     struct drm_atomic_state *state,
 				     uint32_t flags);
 void drm_atomic_helper_cleanup_planes(struct drm_device *dev,
 				      struct drm_atomic_state *old_state);
 void drm_atomic_helper_commit_planes_on_crtc(struct drm_crtc_state *old_crtc_state);
 void
 drm_atomic_helper_disable_planes_on_crtc(struct drm_crtc_state *old_crtc_state,
 					 bool atomic);

 int __must_check drm_atomic_helper_swap_state(struct drm_atomic_state *state,
 					      bool stall);

 /* nonblocking commit helpers */
 int drm_atomic_helper_setup_commit(struct drm_atomic_state *state,
 				   bool nonblock);
 void drm_atomic_helper_wait_for_dependencies(struct drm_atomic_state *state);
 void drm_atomic_helper_commit_hw_done(struct drm_atomic_state *state);
 void drm_atomic_helper_commit_cleanup_done(struct drm_atomic_state *state);

 /* implementations for legacy interfaces */
 int drm_atomic_helper_update_plane(struct drm_plane *plane,
 				   struct drm_crtc *crtc,
 				   struct drm_framebuffer *fb,
 				   int crtc_x, int crtc_y,
 				   unsigned int crtc_w, unsigned int crtc_h,
 				   uint32_t src_x, uint32_t src_y,
 				   uint32_t src_w, uint32_t src_h,
 				   struct drm_modeset_acquire_ctx *ctx);
 int drm_atomic_helper_disable_plane(struct drm_plane *plane,
 				    struct drm_modeset_acquire_ctx *ctx);
 int __drm_atomic_helper_disable_plane(struct drm_plane *plane,
 		struct drm_plane_state *plane_state);
 int drm_atomic_helper_set_config(struct drm_mode_set *set,
 				 struct drm_modeset_acquire_ctx *ctx);
 int __drm_atomic_helper_set_config(struct drm_mode_set *set,
 		struct drm_atomic_state *state);

 int drm_atomic_helper_disable_all(struct drm_device *dev,
 				  struct drm_modeset_acquire_ctx *ctx);
 void drm_atomic_helper_shutdown(struct drm_device *dev);
 struct drm_atomic_state *drm_atomic_helper_suspend(struct drm_device *dev);
 int drm_atomic_helper_commit_duplicated_state(struct drm_atomic_state *state,
 					      struct drm_modeset_acquire_ctx *ctx);
 int drm_atomic_helper_resume(struct drm_device *dev,
 			     struct drm_atomic_state *state);

 int drm_atomic_helper_page_flip(struct drm_crtc *crtc,
 				struct drm_framebuffer *fb,
 				struct drm_pending_vblank_event *event,
 				uint32_t flags,
 				struct drm_modeset_acquire_ctx *ctx);
 int drm_atomic_helper_page_flip_target(
 				struct drm_crtc *crtc,
 				struct drm_framebuffer *fb,
 				struct drm_pending_vblank_event *event,
 				uint32_t flags,
 				uint32_t target,
 				struct drm_modeset_acquire_ctx *ctx);
 struct drm_encoder *
 drm_atomic_helper_best_encoder(struct drm_connector *connector);

 /* default implementations for state handling */
 void drm_atomic_helper_crtc_reset(struct drm_crtc *crtc);
 void __drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc,
 					      struct drm_crtc_state *state);
 struct drm_crtc_state *
 drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc);
 void __drm_atomic_helper_crtc_destroy_state(struct drm_crtc_state *state);
 void drm_atomic_helper_crtc_destroy_state(struct drm_crtc *crtc,
 					  struct drm_crtc_state *state);

 void drm_atomic_helper_plane_reset(struct drm_plane *plane);
 void __drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane,
 					       struct drm_plane_state *state);
 struct drm_plane_state *
 drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane);
 void __drm_atomic_helper_plane_destroy_state(struct drm_plane_state *state);
 void drm_atomic_helper_plane_destroy_state(struct drm_plane *plane,
 					  struct drm_plane_state *state);

 void __drm_atomic_helper_connector_reset(struct drm_connector *connector,
 					 struct drm_connector_state *conn_state);
 void drm_atomic_helper_connector_reset(struct drm_connector *connector);
 void
 __drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector,
 					   struct drm_connector_state *state);
 struct drm_connector_state *
 drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector);
 struct drm_atomic_state *
 drm_atomic_helper_duplicate_state(struct drm_device *dev,
 				  struct drm_modeset_acquire_ctx *ctx);
 void
 __drm_atomic_helper_connector_destroy_state(struct drm_connector_state *state);
 void drm_atomic_helper_connector_destroy_state(struct drm_connector *connector,
 					  struct drm_connector_state *state);
 int drm_atomic_helper_legacy_gamma_set(struct drm_crtc *crtc,
 				       u16 *red, u16 *green, u16 *blue,
 				       uint32_t size,
 				       struct drm_modeset_acquire_ctx *ctx);
 void __drm_atomic_helper_private_obj_duplicate_state(struct drm_private_obj *obj,
 						     struct drm_private_state *state);

 /**
  * drm_atomic_crtc_for_each_plane - iterate over planes currently attached to CRTC
  * @plane: the loop cursor
  * @crtc:  the crtc whose planes are iterated
  *
  * This iterates over the current state, useful (for example) when applying
  * atomic state after it has been checked and swapped.  To iterate over the
  * planes which *will* be attached (more useful in code called from
  * &drm_mode_config_funcs.atomic_check) see
  * drm_atomic_crtc_state_for_each_plane().
  */
 #define drm_atomic_crtc_for_each_plane(plane, crtc) \
 	drm_for_each_plane_mask(plane, (crtc)->dev, (crtc)->state->plane_mask)

 /**
  * drm_crtc_atomic_state_for_each_plane - iterate over attached planes in new state
  * @plane: the loop cursor
  * @crtc_state: the incoming crtc-state
  *
  * Similar to drm_crtc_for_each_plane(), but iterates the planes that will be
  * attached if the specified state is applied.  Useful during for example
  * in code called from &drm_mode_config_funcs.atomic_check operations, to
  * validate the incoming state.
  */
 #define drm_atomic_crtc_state_for_each_plane(plane, crtc_state) \
 	drm_for_each_plane_mask(plane, (crtc_state)->state->dev, (crtc_state)->plane_mask)

 /**
  * drm_crtc_atomic_state_for_each_plane_state - iterate over attached planes in new state
  * @plane: the loop cursor
  * @plane_state: loop cursor for the plane's state, must be const
  * @crtc_state: the incoming crtc-state
  *
  * Similar to drm_crtc_for_each_plane(), but iterates the planes that will be
  * attached if the specified state is applied.  Useful during for example
  * in code called from &drm_mode_config_funcs.atomic_check operations, to
  * validate the incoming state.
  *
  * Compared to just drm_atomic_crtc_state_for_each_plane() this also fills in a
  * const plane_state. This is useful when a driver just wants to peek at other
  * active planes on this crtc, but does not need to change it.
  */
 #define drm_atomic_crtc_state_for_each_plane_state(plane, plane_state, crtc_state) \
 	drm_for_each_plane_mask(plane, (crtc_state)->state->dev, (crtc_state)->plane_mask) \
 		for_each_if ((plane_state = \
 			      __drm_atomic_get_current_plane_state((crtc_state)->state, \
 								   plane)))

 /**
  * drm_atomic_plane_disabling - check whether a plane is being disabled
  * @old_plane_state: old atomic plane state
  * @new_plane_state: new atomic plane state
  *
  * Checks the atomic state of a plane to determine whether it's being disabled
  * or not. This also WARNs if it detects an invalid state (both CRTC and FB
  * need to either both be NULL or both be non-NULL).
  *
  * RETURNS:
  * True if the plane is being disabled, false otherwise.
  */
 static inline bool
 drm_atomic_plane_disabling(struct drm_plane_state *old_plane_state,
 			   struct drm_plane_state *new_plane_state)
 {
 	/*
 	 * When disabling a plane, CRTC and FB should always be NULL together.
 	 * Anything else should be considered a bug in the atomic core, so we
 	 * gently warn about it.
 	 */
 	WARN_ON((new_plane_state->crtc == NULL && new_plane_state->fb != NULL) ||
 		(new_plane_state->crtc != NULL && new_plane_state->fb == NULL));

 	return old_plane_state->crtc && !new_plane_state->crtc;
 }

 #endif /* DRM_ATOMIC_HELPER_H_ */
	/*
	* Copyright (C) 2014 Red Hat
	* Copyright (C) 2014 Intel Corp.
	*
	* Permission is hereby granted, free of charge, to any person obtaining a
	* copy of this software and associated documentation files (the "Software"),
	* to deal in the Software without restriction, including without limitation
	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	* and/or sell copies of the Software, and to permit persons to whom the
	* Software is furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be included in
	* all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	* OTHER DEALINGS IN THE SOFTWARE.
	*
	* Authors:
	* Rob Clark <robdclark@gmail.com>
	* Daniel Vetter <daniel.vetter@ffwll.ch>
	*/

	#ifndef DRM_ATOMIC_HELPER_H_
	#define DRM_ATOMIC_HELPER_H_

	#include <drm/drm_crtc.h>
	#include <drm/drm_modeset_helper_vtables.h>
	#include <drm/drm_modeset_helper.h>

	struct drm_atomic_state;
	struct drm_private_obj;
	struct drm_private_state;

	int drm_atomic_helper_check_modeset(struct drm_device *dev,
	struct drm_atomic_state *state);
	int drm_atomic_helper_check_plane_state(struct drm_plane_state *plane_state,
	const struct drm_crtc_state *crtc_state,
	int min_scale,
	int max_scale,
	bool can_position,
	bool can_update_disabled);
	int drm_atomic_helper_check_planes(struct drm_device *dev,
	struct drm_atomic_state *state);
	int drm_atomic_helper_check(struct drm_device *dev,
	struct drm_atomic_state *state);
	void drm_atomic_helper_commit_tail(struct drm_atomic_state *state);
	void drm_atomic_helper_commit_tail_rpm(struct drm_atomic_state *state);
	int drm_atomic_helper_commit(struct drm_device *dev,
	struct drm_atomic_state *state,
	bool nonblock);
	int drm_atomic_helper_async_check(struct drm_device *dev,
	struct drm_atomic_state *state);
	void drm_atomic_helper_async_commit(struct drm_device *dev,
	struct drm_atomic_state *state);

	int drm_atomic_helper_wait_for_fences(struct drm_device *dev,
	struct drm_atomic_state *state,
	bool pre_swap);

	void drm_atomic_helper_wait_for_vblanks(struct drm_device *dev,
	struct drm_atomic_state *old_state);

	void drm_atomic_helper_wait_for_flip_done(struct drm_device *dev,
	struct drm_atomic_state *old_state);

	void
	drm_atomic_helper_update_legacy_modeset_state(struct drm_device *dev,
	struct drm_atomic_state *old_state);

	void drm_atomic_helper_commit_modeset_disables(struct drm_device *dev,
	struct drm_atomic_state *state);
	void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
	struct drm_atomic_state *old_state);

	int drm_atomic_helper_prepare_planes(struct drm_device *dev,
	struct drm_atomic_state *state);

	#define DRM_PLANE_COMMIT_ACTIVE_ONLY BIT(0)
	#define DRM_PLANE_COMMIT_NO_DISABLE_AFTER_MODESET BIT(1)

	void drm_atomic_helper_commit_planes(struct drm_device *dev,
	struct drm_atomic_state *state,
	uint32_t flags);
	void drm_atomic_helper_cleanup_planes(struct drm_device *dev,
	struct drm_atomic_state *old_state);
	void drm_atomic_helper_commit_planes_on_crtc(struct drm_crtc_state *old_crtc_state);
	void
	drm_atomic_helper_disable_planes_on_crtc(struct drm_crtc_state *old_crtc_state,
	bool atomic);

	int __must_check drm_atomic_helper_swap_state(struct drm_atomic_state *state,
	bool stall);

	/* nonblocking commit helpers */
	int drm_atomic_helper_setup_commit(struct drm_atomic_state *state,
	bool nonblock);
	void drm_atomic_helper_wait_for_dependencies(struct drm_atomic_state *state);
	void drm_atomic_helper_commit_hw_done(struct drm_atomic_state *state);
	void drm_atomic_helper_commit_cleanup_done(struct drm_atomic_state *state);

	/* implementations for legacy interfaces */
	int drm_atomic_helper_update_plane(struct drm_plane *plane,
	struct drm_crtc *crtc,
	struct drm_framebuffer *fb,
	int crtc_x, int crtc_y,
	unsigned int crtc_w, unsigned int crtc_h,
	uint32_t src_x, uint32_t src_y,
	uint32_t src_w, uint32_t src_h,
	struct drm_modeset_acquire_ctx *ctx);
	int drm_atomic_helper_disable_plane(struct drm_plane *plane,
	struct drm_modeset_acquire_ctx *ctx);
	int __drm_atomic_helper_disable_plane(struct drm_plane *plane,
	struct drm_plane_state *plane_state);
	int drm_atomic_helper_set_config(struct drm_mode_set *set,
	struct drm_modeset_acquire_ctx *ctx);
	int __drm_atomic_helper_set_config(struct drm_mode_set *set,
	struct drm_atomic_state *state);

	int drm_atomic_helper_disable_all(struct drm_device *dev,
	struct drm_modeset_acquire_ctx *ctx);
	void drm_atomic_helper_shutdown(struct drm_device *dev);
	struct drm_atomic_state drm_atomic_helper_suspend(struct drm_device dev);
	int drm_atomic_helper_commit_duplicated_state(struct drm_atomic_state *state,
	struct drm_modeset_acquire_ctx *ctx);
	int drm_atomic_helper_resume(struct drm_device *dev,
	struct drm_atomic_state *state);

	int drm_atomic_helper_page_flip(struct drm_crtc *crtc,
	struct drm_framebuffer *fb,
	struct drm_pending_vblank_event *event,
	uint32_t flags,
	struct drm_modeset_acquire_ctx *ctx);
	int drm_atomic_helper_page_flip_target(
	struct drm_crtc *crtc,
	struct drm_framebuffer *fb,
	struct drm_pending_vblank_event *event,
	uint32_t flags,
	uint32_t target,
	struct drm_modeset_acquire_ctx *ctx);
	struct drm_encoder *
	drm_atomic_helper_best_encoder(struct drm_connector *connector);

	/* default implementations for state handling */
	void drm_atomic_helper_crtc_reset(struct drm_crtc *crtc);
	void __drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc,
	struct drm_crtc_state *state);
	struct drm_crtc_state *
	drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc);
	void __drm_atomic_helper_crtc_destroy_state(struct drm_crtc_state *state);
	void drm_atomic_helper_crtc_destroy_state(struct drm_crtc *crtc,
	struct drm_crtc_state *state);

	void drm_atomic_helper_plane_reset(struct drm_plane *plane);
	void __drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane,
	struct drm_plane_state *state);
	struct drm_plane_state *
	drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane);
	void __drm_atomic_helper_plane_destroy_state(struct drm_plane_state *state);
	void drm_atomic_helper_plane_destroy_state(struct drm_plane *plane,
	struct drm_plane_state *state);

	void __drm_atomic_helper_connector_reset(struct drm_connector *connector,
	struct drm_connector_state *conn_state);
	void drm_atomic_helper_connector_reset(struct drm_connector *connector);
	void
	__drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector,
	struct drm_connector_state *state);
	struct drm_connector_state *
	drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector);
	struct drm_atomic_state *
	drm_atomic_helper_duplicate_state(struct drm_device *dev,
	struct drm_modeset_acquire_ctx *ctx);
	void
	__drm_atomic_helper_connector_destroy_state(struct drm_connector_state *state);
	void drm_atomic_helper_connector_destroy_state(struct drm_connector *connector,
	struct drm_connector_state *state);
	int drm_atomic_helper_legacy_gamma_set(struct drm_crtc *crtc,
	u16 red, u16 green, u16 *blue,
	uint32_t size,
	struct drm_modeset_acquire_ctx *ctx);
	void __drm_atomic_helper_private_obj_duplicate_state(struct drm_private_obj *obj,
	struct drm_private_state *state);

	/**
	* drm_atomic_crtc_for_each_plane - iterate over planes currently attached to CRTC
	* @plane: the loop cursor
	* @crtc: the crtc whose planes are iterated
	*
	* This iterates over the current state, useful (for example) when applying
	* atomic state after it has been checked and swapped. To iterate over the
	* planes which will be attached (more useful in code called from
	* &drm_mode_config_funcs.atomic_check) see
	* drm_atomic_crtc_state_for_each_plane().
	*/
	#define drm_atomic_crtc_for_each_plane(plane, crtc) \
	drm_for_each_plane_mask(plane, (crtc)->dev, (crtc)->state->plane_mask)

	/**
	* drm_crtc_atomic_state_for_each_plane - iterate over attached planes in new state
	* @plane: the loop cursor
	* @crtc_state: the incoming crtc-state
	*
	* Similar to drm_crtc_for_each_plane(), but iterates the planes that will be
	* attached if the specified state is applied. Useful during for example
	* in code called from &drm_mode_config_funcs.atomic_check operations, to
	* validate the incoming state.
	*/
	#define drm_atomic_crtc_state_for_each_plane(plane, crtc_state) \
	drm_for_each_plane_mask(plane, (crtc_state)->state->dev, (crtc_state)->plane_mask)

	/**
	* drm_crtc_atomic_state_for_each_plane_state - iterate over attached planes in new state
	* @plane: the loop cursor
	* @plane_state: loop cursor for the plane's state, must be const
	* @crtc_state: the incoming crtc-state
	*
	* Similar to drm_crtc_for_each_plane(), but iterates the planes that will be
	* attached if the specified state is applied. Useful during for example
	* in code called from &drm_mode_config_funcs.atomic_check operations, to
	* validate the incoming state.
	*
	* Compared to just drm_atomic_crtc_state_for_each_plane() this also fills in a
	* const plane_state. This is useful when a driver just wants to peek at other
	* active planes on this crtc, but does not need to change it.
	*/
	#define drm_atomic_crtc_state_for_each_plane_state(plane, plane_state, crtc_state) \
	drm_for_each_plane_mask(plane, (crtc_state)->state->dev, (crtc_state)->plane_mask) \
	for_each_if ((plane_state = \
	__drm_atomic_get_current_plane_state((crtc_state)->state, \
	plane)))

	/**
	* drm_atomic_plane_disabling - check whether a plane is being disabled
	* @old_plane_state: old atomic plane state
	* @new_plane_state: new atomic plane state
	*
	* Checks the atomic state of a plane to determine whether it's being disabled
	* or not. This also WARNs if it detects an invalid state (both CRTC and FB
	* need to either both be NULL or both be non-NULL).
	*
	* RETURNS:
	* True if the plane is being disabled, false otherwise.
	*/
	static inline bool
	drm_atomic_plane_disabling(struct drm_plane_state *old_plane_state,
	struct drm_plane_state *new_plane_state)
	{
	/*
	* When disabling a plane, CRTC and FB should always be NULL together.
	* Anything else should be considered a bug in the atomic core, so we
	* gently warn about it.
	*/
	WARN_ON((new_plane_state->crtc == NULL && new_plane_state->fb != NULL) \|\|
	(new_plane_state->crtc != NULL && new_plane_state->fb == NULL));

	return old_plane_state->crtc && !new_plane_state->crtc;
	}

	#endif /* DRM_ATOMIC_HELPER_H_ */