[linux-2.6-block.git] / include / drm / drm_vblank.h

/*
 * Copyright 2016 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 (including the next
 * paragraph) 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
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS 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.
 */

#ifndef _DRM_VBLANK_H_
#define _DRM_VBLANK_H_

#include <linux/seqlock.h>
#include <linux/idr.h>
#include <linux/poll.h>

#include <drm/drm_file.h>
#include <drm/drm_modes.h>
#include <uapi/drm/drm.h>

struct drm_device;
struct drm_crtc;

/**
 * struct drm_pending_vblank_event - pending vblank event tracking
 */
struct drm_pending_vblank_event {
	/**
	 * @base: Base structure for tracking pending DRM events.
	 */
	struct drm_pending_event base;
	/**
	 * @pipe: drm_crtc_index() of the &drm_crtc this event is for.
	 */
	unsigned int pipe;
	/**
	 * @event: Actual event which will be sent to userspace.
	 */
	struct drm_event_vblank event;
};

/**
 * struct drm_vblank_crtc - vblank tracking for a CRTC
 *
 * This structure tracks the vblank state for one CRTC.
 *
 * Note that for historical reasons - the vblank handling code is still shared
 * with legacy/non-kms drivers - this is a free-standing structure not directly
 * connected to &struct drm_crtc. But all public interface functions are taking
 * a &struct drm_crtc to hide this implementation detail.
 */
struct drm_vblank_crtc {
	/**
	 * @dev: Pointer to the &drm_device.
	 */
	struct drm_device *dev;
	/**
	 * @queue: Wait queue for vblank waiters.
	 */
	wait_queue_head_t queue;	/**< VBLANK wait queue */
	/**
	 * @disable_timer: Disable timer for the delayed vblank disabling
	 * hysteresis logic. Vblank disabling is controlled through the
	 * drm_vblank_offdelay module option and the setting of the
	 * &drm_device.max_vblank_count value.
	 */
	struct timer_list disable_timer;

	/**
	 * @seqlock: Protect vblank count and time.
	 */
	seqlock_t seqlock;		/* protects vblank count and time */

	/**
	 * @count: Current software vblank counter.
	 */
	u32 count;
	/**
	 * @time: Vblank timestamp corresponding to @count.
	 */
	struct timeval time;

	/**
	 * @refcount: Number of users/waiters of the vblank interrupt. Only when
	 * this refcount reaches 0 can the hardware interrupt be disabled using
	 * @disable_timer.
	 */
	atomic_t refcount;		/* number of users of vblank interruptsper crtc */
	/**
	 * @last: Protected by &drm_device.vbl_lock, used for wraparound handling.
	 */
	u32 last;
	/**
	 * @inmodeset: Tracks whether the vblank is disabled due to a modeset.
	 * For legacy driver bit 2 additionally tracks whether an additional
	 * temporary vblank reference has been acquired to paper over the
	 * hardware counter resetting/jumping. KMS drivers should instead just
	 * call drm_crtc_vblank_off() and drm_crtc_vblank_on(), which explicitly
	 * save and restore the vblank count.
	 */
	unsigned int inmodeset;		/* Display driver is setting mode */
	/**
	 * @pipe: drm_crtc_index() of the &drm_crtc corresponding to this
	 * structure.
	 */
	unsigned int pipe;
	/**
	 * @framedur_ns: Frame/Field duration in ns, used by
	 * drm_calc_vbltimestamp_from_scanoutpos() and computed by
	 * drm_calc_timestamping_constants().
	 */
	int framedur_ns;
	/**
	 * @linedur_ns: Line duration in ns, used by
	 * drm_calc_vbltimestamp_from_scanoutpos() and computed by
	 * drm_calc_timestamping_constants().
	 */
	int linedur_ns;

	/**
	 * @hwmode:
	 *
	 * Cache of the current hardware display mode. Only valid when @enabled
	 * is set. This is used by helpers like
	 * drm_calc_vbltimestamp_from_scanoutpos(). We can't just access the
	 * hardware mode by e.g. looking at &drm_crtc_state.adjusted_mode,
	 * because that one is really hard to get from interrupt context.
	 */
	struct drm_display_mode hwmode;

	/**
	 * @enabled: Tracks the enabling state of the corresponding &drm_crtc to
	 * avoid double-disabling and hence corrupting saved state. Needed by
	 * drivers not using atomic KMS, since those might go through their CRTC
	 * disabling functions multiple times.
	 */
	bool enabled;
};

int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs);
u32 drm_crtc_vblank_count(struct drm_crtc *crtc);
u32 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc,
				   struct timeval *vblanktime);
void drm_crtc_send_vblank_event(struct drm_crtc *crtc,
			       struct drm_pending_vblank_event *e);
void drm_crtc_arm_vblank_event(struct drm_crtc *crtc,
			      struct drm_pending_vblank_event *e);
bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe);
bool drm_crtc_handle_vblank(struct drm_crtc *crtc);
int drm_crtc_vblank_get(struct drm_crtc *crtc);
void drm_crtc_vblank_put(struct drm_crtc *crtc);
void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe);
void drm_crtc_wait_one_vblank(struct drm_crtc *crtc);
void drm_crtc_vblank_off(struct drm_crtc *crtc);
void drm_crtc_vblank_reset(struct drm_crtc *crtc);
void drm_crtc_vblank_on(struct drm_crtc *crtc);
u32 drm_crtc_accurate_vblank_count(struct drm_crtc *crtc);

bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
					   unsigned int pipe, int *max_error,
					   struct timeval *vblank_time,
					   bool in_vblank_irq);
void drm_calc_timestamping_constants(struct drm_crtc *crtc,
				     const struct drm_display_mode *mode);
wait_queue_head_t *drm_crtc_vblank_waitqueue(struct drm_crtc *crtc);
#endif
Commit	Line	Data
3ed4351a DV	1	/*
	2	* Copyright 2016 Intel Corp.
	3	*
	4	* Permission is hereby granted, free of charge, to any person obtaining a
	5	* copy of this software and associated documentation files (the "Software"),
	6	* to deal in the Software without restriction, including without limitation
	7	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	8	* and/or sell copies of the Software, and to permit persons to whom the
	9	* Software is furnished to do so, subject to the following conditions:
	10	*
	11	* The above copyright notice and this permission notice (including the next
	12	* paragraph) shall be included in all copies or substantial portions of the
	13	* 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	* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS 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
	24	#ifndef _DRM_VBLANK_H_
	25	#define _DRM_VBLANK_H_
	26
	27	#include <linux/seqlock.h>
	28	#include <linux/idr.h>
	29	#include <linux/poll.h>
	30
	31	#include <drm/drm_file.h>
	32	#include <drm/drm_modes.h>
	33	#include <uapi/drm/drm.h>
	34
	35	struct drm_device;
	36	struct drm_crtc;
	37
	38	/**
	39	* struct drm_pending_vblank_event - pending vblank event tracking
	40	*/
	41	struct drm_pending_vblank_event {
	42	/**
	43	* @base: Base structure for tracking pending DRM events.
	44	*/
	45	struct drm_pending_event base;
	46	/**
	47	* @pipe: drm_crtc_index() of the &drm_crtc this event is for.
	48	*/
	49	unsigned int pipe;
	50	/**
	51	* @event: Actual event which will be sent to userspace.
	52	*/
	53	struct drm_event_vblank event;
	54	};
	55
	56	/**
	57	* struct drm_vblank_crtc - vblank tracking for a CRTC
	58	*
	59	* This structure tracks the vblank state for one CRTC.
	60	*
	61	* Note that for historical reasons - the vblank handling code is still shared
	62	* with legacy/non-kms drivers - this is a free-standing structure not directly
	63	* connected to &struct drm_crtc. But all public interface functions are taking
	64	* a &struct drm_crtc to hide this implementation detail.
65	*/
66	struct drm_vblank_crtc {
67	/**
68	* @dev: Pointer to the &drm_device.
69	*/
70	struct drm_device *dev;
71	/**
72	* @queue: Wait queue for vblank waiters.
73	*/
74	wait_queue_head_t queue; /*< VBLANK wait queue /
75	/**
76	* @disable_timer: Disable timer for the delayed vblank disabling
77	* hysteresis logic. Vblank disabling is controlled through the
78	* drm_vblank_offdelay module option and the setting of the
79	* &drm_device.max_vblank_count value.
80	*/
81	struct timer_list disable_timer;
82
83	/**
84	* @seqlock: Protect vblank count and time.
85	*/
86	seqlock_t seqlock; /* protects vblank count and time */
87
88	/**
89	* @count: Current software vblank counter.
90	*/
91	u32 count;
92	/**
93	* @time: Vblank timestamp corresponding to @count.
94	*/
95	struct timeval time;
96
97	/**
98	* @refcount: Number of users/waiters of the vblank interrupt. Only when
99	* this refcount reaches 0 can the hardware interrupt be disabled using
100	* @disable_timer.
101	*/
102	atomic_t refcount; /* number of users of vblank interruptsper crtc */
103	/**
104	* @last: Protected by &drm_device.vbl_lock, used for wraparound handling.
105	*/
106	u32 last;
107	/**
108	* @inmodeset: Tracks whether the vblank is disabled due to a modeset.
109	* For legacy driver bit 2 additionally tracks whether an additional
110	* temporary vblank reference has been acquired to paper over the
111	* hardware counter resetting/jumping. KMS drivers should instead just
112	* call drm_crtc_vblank_off() and drm_crtc_vblank_on(), which explicitly
113	* save and restore the vblank count.
114	*/
115	unsigned int inmodeset; /* Display driver is setting mode */
116	/**
117	* @pipe: drm_crtc_index() of the &drm_crtc corresponding to this
118	* structure.
119	*/
120	unsigned int pipe;
121	/**
122	* @framedur_ns: Frame/Field duration in ns, used by
123	* drm_calc_vbltimestamp_from_scanoutpos() and computed by
124	* drm_calc_timestamping_constants().
125	*/
126	int framedur_ns;
127	/**
128	* @linedur_ns: Line duration in ns, used by
129	* drm_calc_vbltimestamp_from_scanoutpos() and computed by
130	* drm_calc_timestamping_constants().
131	*/
132	int linedur_ns;
133
134	/**
135	* @hwmode:
136	*
137	* Cache of the current hardware display mode. Only valid when @enabled
138	* is set. This is used by helpers like
139	* drm_calc_vbltimestamp_from_scanoutpos(). We can't just access the
140	* hardware mode by e.g. looking at &drm_crtc_state.adjusted_mode,
141	* because that one is really hard to get from interrupt context.
142	*/
143	struct drm_display_mode hwmode;
144
145	/**
146	* @enabled: Tracks the enabling state of the corresponding &drm_crtc to
147	* avoid double-disabling and hence corrupting saved state. Needed by
148	* drivers not using atomic KMS, since those might go through their CRTC
149	* disabling functions multiple times.
150	*/
151	bool enabled;
152	};
153
154	int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs);
155	u32 drm_crtc_vblank_count(struct drm_crtc *crtc);
156	u32 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc,
157	struct timeval *vblanktime);
158	void drm_crtc_send_vblank_event(struct drm_crtc *crtc,
159	struct drm_pending_vblank_event *e);
160	void drm_crtc_arm_vblank_event(struct drm_crtc *crtc,
161	struct drm_pending_vblank_event *e);
162	bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe);
163	bool drm_crtc_handle_vblank(struct drm_crtc *crtc);
164	int drm_crtc_vblank_get(struct drm_crtc *crtc);
165	void drm_crtc_vblank_put(struct drm_crtc *crtc);
166	void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe);
167	void drm_crtc_wait_one_vblank(struct drm_crtc *crtc);
168	void drm_crtc_vblank_off(struct drm_crtc *crtc);
169	void drm_crtc_vblank_reset(struct drm_crtc *crtc);
170	void drm_crtc_vblank_on(struct drm_crtc *crtc);
ca814b25	171	u32 drm_crtc_accurate_vblank_count(struct drm_crtc *crtc);
3ed4351a DV	172
	173	bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
	174	unsigned int pipe, int *max_error,
	175	struct timeval *vblank_time,
	176	bool in_vblank_irq);
	177	void drm_calc_timestamping_constants(struct drm_crtc *crtc,
	178	const struct drm_display_mode *mode);
	179	wait_queue_head_t drm_crtc_vblank_waitqueue(struct drm_crtc crtc);
	180	#endif