[linux.git] / include / drm / 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 <[email protected]>
 * Daniel Vetter <[email protected]>
 */

#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;

int drm_atomic_helper_check_modeset(struct drm_device *dev,
				struct drm_atomic_state *state);
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);
int drm_atomic_helper_commit(struct drm_device *dev,
			     struct drm_atomic_state *state,
			     bool nonblock);

int drm_atomic_helper_wait_for_fences(struct drm_device *dev,
					struct drm_atomic_state *state,
					bool pre_swap);
bool drm_atomic_helper_framebuffer_changed(struct drm_device *dev,
					   struct drm_atomic_state *old_state,
					   struct drm_crtc *crtc);

void drm_atomic_helper_wait_for_vblanks(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);

void 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);
int drm_atomic_helper_disable_plane(struct drm_plane *plane);
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);
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);
struct drm_atomic_state *drm_atomic_helper_suspend(struct drm_device *dev);
int drm_atomic_helper_resume(struct drm_device *dev,
			     struct drm_atomic_state *state);

int drm_atomic_helper_crtc_set_property(struct drm_crtc *crtc,
					struct drm_property *property,
					uint64_t val);
int drm_atomic_helper_plane_set_property(struct drm_plane *plane,
					struct drm_property *property,
					uint64_t val);
int drm_atomic_helper_connector_set_property(struct drm_connector *connector,
					struct drm_property *property,
					uint64_t val);
int drm_atomic_helper_page_flip(struct drm_crtc *crtc,
				struct drm_framebuffer *fb,
				struct drm_pending_vblank_event *event,
				uint32_t flags);
int drm_atomic_helper_connector_dpms(struct drm_connector *connector,
				     int mode);
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);

/**
 * 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 (for ->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)
 * ->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)
 * ->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
 * @plane: plane object
 * @old_state: previous atomic 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 *plane,
			   struct drm_plane_state *old_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((plane->state->crtc == NULL && plane->state->fb != NULL) ||
		(plane->state->crtc != NULL && plane->state->fb == NULL));

	/*
	 * When using the transitional helpers, old_state may be NULL. If so,
	 * we know nothing about the current state and have to assume that it
	 * might be enabled.
	 *
	 * When using the atomic helpers, old_state won't be NULL. Therefore
	 * this check assumes that either the driver will have reconstructed
	 * the correct state in ->reset() or that the driver will have taken
	 * appropriate measures to disable all planes.
	 */
	return (!old_state || old_state->crtc) && !plane->state->crtc;
}

#endif /* DRM_ATOMIC_HELPER_H_ */
Commit	Line	Data
c2fcd274 SV	1	/*
	2	* Copyright (C) 2014 Red Hat
	3	* Copyright (C) 2014 Intel Corp.
	4	*
	5	* Permission is hereby granted, free of charge, to any person obtaining a
	6	* copy of this software and associated documentation files (the "Software"),
	7	* to deal in the Software without restriction, including without limitation
	8	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	9	* and/or sell copies of the Software, and to permit persons to whom the
	10	* Software is furnished to do so, subject to the following conditions:
	11	*
	12	* The above copyright notice and this permission notice shall be included in
	13	* all copies or substantial portions of the Software.
	14	*
	15	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	16	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	17	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	18	* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
	19	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	20	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	21	* OTHER DEALINGS IN THE SOFTWARE.
	22	*
	23	* Authors:
	24	* Rob Clark <[email protected]>
	25	* Daniel Vetter <[email protected]>
	26	*/
	27
	28	#ifndef DRM_ATOMIC_HELPER_H_
	29	#define DRM_ATOMIC_HELPER_H_
	30
0254951d	31	#include <drm/drm_crtc.h>
1de72faf SV	32	#include <drm/drm_modeset_helper_vtables.h>
1de72faf SV	33	#include <drm/drm_modeset_helper.h>
0254951d	34
bbb1e524 RC	35	struct drm_atomic_state;
bbb1e524 RC	36
d9b13620 SV	37	int drm_atomic_helper_check_modeset(struct drm_device *dev,
	38	struct drm_atomic_state *state);
	39	int drm_atomic_helper_check_planes(struct drm_device *dev,
	40	struct drm_atomic_state *state);
c2fcd274 SV	41	int drm_atomic_helper_check(struct drm_device *dev,
c2fcd274 SV	42	struct drm_atomic_state *state);
9f2a7950	43	void drm_atomic_helper_commit_tail(struct drm_atomic_state *state);
623369e5 SV	44	int drm_atomic_helper_commit(struct drm_device *dev,
623369e5 SV	45	struct drm_atomic_state *state,
286dbb8d	46	bool nonblock);
623369e5	47
f6ce410a GP	48	int drm_atomic_helper_wait_for_fences(struct drm_device *dev,
	49	struct drm_atomic_state *state,
	50	bool pre_swap);
c240906d JK	51	bool drm_atomic_helper_framebuffer_changed(struct drm_device *dev,
	52	struct drm_atomic_state *old_state,
	53	struct drm_crtc *crtc);
	54
5ee3229c RC	55	void drm_atomic_helper_wait_for_vblanks(struct drm_device *dev,
	56	struct drm_atomic_state *old_state);
	57
4c18d301 SV	58	void
	59	drm_atomic_helper_update_legacy_modeset_state(struct drm_device *dev,
	60	struct drm_atomic_state *old_state);
	61
1af434a9 SV	62	void drm_atomic_helper_commit_modeset_disables(struct drm_device *dev,
	63	struct drm_atomic_state *state);
	64	void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
623369e5	65	struct drm_atomic_state *old_state);
c2fcd274 SV	66
	67	int drm_atomic_helper_prepare_planes(struct drm_device *dev,
	68	struct drm_atomic_state *state);
2b58e98d LY	69
	70	#define DRM_PLANE_COMMIT_ACTIVE_ONLY BIT(0)
	71	#define DRM_PLANE_COMMIT_NO_DISABLE_AFTER_MODESET BIT(1)
	72
c2fcd274	73	void drm_atomic_helper_commit_planes(struct drm_device *dev,
aef9dbb8	74	struct drm_atomic_state *state,
2b58e98d	75	uint32_t flags);
c2fcd274 SV	76	void drm_atomic_helper_cleanup_planes(struct drm_device *dev,
c2fcd274 SV	77	struct drm_atomic_state *old_state);
de28d021	78	void drm_atomic_helper_commit_planes_on_crtc(struct drm_crtc_state *old_crtc_state);
28500291 LY	79	void
	80	drm_atomic_helper_disable_planes_on_crtc(struct drm_crtc_state *old_crtc_state,
	81	bool atomic);
c2fcd274	82
5e84c269 SV	83	void drm_atomic_helper_swap_state(struct drm_atomic_state *state,
5e84c269 SV	84	bool stall);
c2fcd274	85
a095caa7 SV	86	/* nonblocking commit helpers */
	87	int drm_atomic_helper_setup_commit(struct drm_atomic_state *state,
	88	bool nonblock);
	89	void drm_atomic_helper_wait_for_dependencies(struct drm_atomic_state *state);
	90	void drm_atomic_helper_commit_hw_done(struct drm_atomic_state *state);
	91	void drm_atomic_helper_commit_cleanup_done(struct drm_atomic_state *state);
	92
042652ed SV	93	/* implementations for legacy interfaces */
	94	int drm_atomic_helper_update_plane(struct drm_plane *plane,
	95	struct drm_crtc *crtc,
	96	struct drm_framebuffer *fb,
	97	int crtc_x, int crtc_y,
	98	unsigned int crtc_w, unsigned int crtc_h,
	99	uint32_t src_x, uint32_t src_y,
	100	uint32_t src_w, uint32_t src_h);
	101	int drm_atomic_helper_disable_plane(struct drm_plane *plane);
bbb1e524 RC	102	int __drm_atomic_helper_disable_plane(struct drm_plane *plane,
bbb1e524 RC	103	struct drm_plane_state *plane_state);
042652ed	104	int drm_atomic_helper_set_config(struct drm_mode_set *set);
bbb1e524 RC	105	int __drm_atomic_helper_set_config(struct drm_mode_set *set,
bbb1e524 RC	106	struct drm_atomic_state *state);
042652ed	107
14942760 TR	108	int drm_atomic_helper_disable_all(struct drm_device *dev,
	109	struct drm_modeset_acquire_ctx *ctx);
	110	struct drm_atomic_state drm_atomic_helper_suspend(struct drm_device dev);
	111	int drm_atomic_helper_resume(struct drm_device *dev,
	112	struct drm_atomic_state *state);
	113
042652ed SV	114	int drm_atomic_helper_crtc_set_property(struct drm_crtc *crtc,
	115	struct drm_property *property,
	116	uint64_t val);
	117	int drm_atomic_helper_plane_set_property(struct drm_plane *plane,
	118	struct drm_property *property,
	119	uint64_t val);
	120	int drm_atomic_helper_connector_set_property(struct drm_connector *connector,
	121	struct drm_property *property,
	122	uint64_t val);
8bc0f312 SV	123	int drm_atomic_helper_page_flip(struct drm_crtc *crtc,
	124	struct drm_framebuffer *fb,
	125	struct drm_pending_vblank_event *event,
	126	uint32_t flags);
9a69a9ac ML	127	int drm_atomic_helper_connector_dpms(struct drm_connector *connector,
9a69a9ac ML	128	int mode);
9ecb5498 NT	129	struct drm_encoder *
9ecb5498 NT	130	drm_atomic_helper_best_encoder(struct drm_connector *connector);
8bc0f312	131
d461701c SV	132	/* default implementations for state handling */
d461701c SV	133	void drm_atomic_helper_crtc_reset(struct drm_crtc *crtc);
f5e7840b TR	134	void __drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc,
f5e7840b TR	135	struct drm_crtc_state *state);
d461701c SV	136	struct drm_crtc_state *
d461701c SV	137	drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc);
ec2dc6a0	138	void __drm_atomic_helper_crtc_destroy_state(struct drm_crtc_state *state);
d461701c SV	139	void drm_atomic_helper_crtc_destroy_state(struct drm_crtc *crtc,
	140	struct drm_crtc_state *state);
	141
	142	void drm_atomic_helper_plane_reset(struct drm_plane *plane);
f5e7840b TR	143	void __drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane,
f5e7840b TR	144	struct drm_plane_state *state);
d461701c SV	145	struct drm_plane_state *
d461701c SV	146	drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane);
2f701695	147	void __drm_atomic_helper_plane_destroy_state(struct drm_plane_state *state);
d461701c SV	148	void drm_atomic_helper_plane_destroy_state(struct drm_plane *plane,
	149	struct drm_plane_state *state);
	150
4cd39917 ML	151	void __drm_atomic_helper_connector_reset(struct drm_connector *connector,
4cd39917 ML	152	struct drm_connector_state *conn_state);
d461701c	153	void drm_atomic_helper_connector_reset(struct drm_connector *connector);
f5e7840b TR	154	void
	155	__drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector,
	156	struct drm_connector_state *state);
d461701c SV	157	struct drm_connector_state *
d461701c SV	158	drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector);
397fd77c TR	159	struct drm_atomic_state *
	160	drm_atomic_helper_duplicate_state(struct drm_device *dev,
	161	struct drm_modeset_acquire_ctx *ctx);
f5e7840b	162	void
fabd9106	163	__drm_atomic_helper_connector_destroy_state(struct drm_connector_state *state);
d461701c SV	164	void drm_atomic_helper_connector_destroy_state(struct drm_connector *connector,
d461701c SV	165	struct drm_connector_state *state);
7ea77283 ML	166	int drm_atomic_helper_legacy_gamma_set(struct drm_crtc *crtc,
	167	u16 red, u16 green, u16 *blue,
	168	uint32_t size);
d461701c	169
dd275956 RC	170	/**
	171	* drm_atomic_crtc_for_each_plane - iterate over planes currently attached to CRTC
	172	* @plane: the loop cursor
	173	* @crtc: the crtc whose planes are iterated
	174	*
	175	* This iterates over the current state, useful (for example) when applying
	176	* atomic state after it has been checked and swapped. To iterate over the
	177	* planes which will be attached (for ->atomic_check()) see
5c0be3f1	178	* drm_atomic_crtc_state_for_each_plane().
dd275956 RC	179	*/
	180	#define drm_atomic_crtc_for_each_plane(plane, crtc) \
	181	drm_for_each_plane_mask(plane, (crtc)->dev, (crtc)->state->plane_mask)
	182
	183	/**
	184	* drm_crtc_atomic_state_for_each_plane - iterate over attached planes in new state
	185	* @plane: the loop cursor
	186	* @crtc_state: the incoming crtc-state
	187	*
	188	* Similar to drm_crtc_for_each_plane(), but iterates the planes that will be
	189	* attached if the specified state is applied. Useful during (for example)
2f196b7c	190	* ->atomic_check() operations, to validate the incoming state.
dd275956 RC	191	*/
	192	#define drm_atomic_crtc_state_for_each_plane(plane, crtc_state) \
	193	drm_for_each_plane_mask(plane, (crtc_state)->state->dev, (crtc_state)->plane_mask)
042652ed	194
2f196b7c SV	195	/**
	196	* drm_crtc_atomic_state_for_each_plane_state - iterate over attached planes in new state
	197	* @plane: the loop cursor
	198	* @plane_state: loop cursor for the plane's state, must be const
	199	* @crtc_state: the incoming crtc-state
	200	*
	201	* Similar to drm_crtc_for_each_plane(), but iterates the planes that will be
	202	* attached if the specified state is applied. Useful during (for example)
	203	* ->atomic_check() operations, to validate the incoming state.
	204	*
	205	* Compared to just drm_atomic_crtc_state_for_each_plane() this also fills in a
	206	* const plane_state. This is useful when a driver just wants to peek at other
	207	* active planes on this crtc, but does not need to change it.
	208	*/
	209	#define drm_atomic_crtc_state_for_each_plane_state(plane, plane_state, crtc_state) \
	210	drm_for_each_plane_mask(plane, (crtc_state)->state->dev, (crtc_state)->plane_mask) \
	211	for_each_if ((plane_state = \
	212	__drm_atomic_get_current_plane_state((crtc_state)->state, \
	213	plane)))
	214
407b8bd9 TR	215	/*
	216	* drm_atomic_plane_disabling - check whether a plane is being disabled
	217	* @plane: plane object
	218	* @old_state: previous atomic state
	219	*
	220	* Checks the atomic state of a plane to determine whether it's being disabled
	221	* or not. This also WARNs if it detects an invalid state (both CRTC and FB
	222	* need to either both be NULL or both be non-NULL).
	223	*
	224	* RETURNS:
	225	* True if the plane is being disabled, false otherwise.
	226	*/
	227	static inline bool
	228	drm_atomic_plane_disabling(struct drm_plane *plane,
	229	struct drm_plane_state *old_state)
	230	{
	231	/*
	232	* When disabling a plane, CRTC and FB should always be NULL together.
	233	* Anything else should be considered a bug in the atomic core, so we
	234	* gently warn about it.
	235	*/
	236	WARN_ON((plane->state->crtc == NULL && plane->state->fb != NULL) \|\|
	237	(plane->state->crtc != NULL && plane->state->fb == NULL));
	238
	239	/*
	240	* When using the transitional helpers, old_state may be NULL. If so,
	241	* we know nothing about the current state and have to assume that it
	242	* might be enabled.
	243	*
	244	* When using the atomic helpers, old_state won't be NULL. Therefore
	245	* this check assumes that either the driver will have reconstructed
	246	* the correct state in ->reset() or that the driver will have taken
	247	* appropriate measures to disable all planes.
	248	*/
	249	return (!old_state \|\| old_state->crtc) && !plane->state->crtc;
	250	}
	251
c2fcd274	252	#endif /* DRM_ATOMIC_HELPER_H_ */