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Release 4.12 include/drm/drm_irq.h

Directory: include/drm
/*
 * 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_IRQ_H_

#define _DRM_IRQ_H_

#include <linux/seqlock.h>

/**
 * 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;
	/**
         * @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_irq_install(struct drm_device *dev, int irq);
int drm_irq_uninstall(struct drm_device *dev);

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);
void drm_vblank_cleanup(struct drm_device *dev);
u32 drm_accurate_vblank_count(struct drm_crtc *crtc);

int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
					  unsigned int pipe, int *max_error,
					  struct timeval *vblank_time,
					  unsigned flags,
					  const struct drm_display_mode *mode);
void drm_calc_timestamping_constants(struct drm_crtc *crtc,
				     const struct drm_display_mode *mode);

/**
 * drm_crtc_vblank_waitqueue - get vblank waitqueue for the CRTC
 * @crtc: which CRTC's vblank waitqueue to retrieve
 *
 * This function returns a pointer to the vblank waitqueue for the CRTC.
 * Drivers can use this to implement vblank waits using wait_event() and related
 * functions.
 */

static inline wait_queue_head_t *drm_crtc_vblank_waitqueue(struct drm_crtc *crtc) { return &crtc->dev->vblank[drm_crtc_index(crtc)].queue; }

Contributors

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Daniel Vetter29100.00%1100.00%
Total29100.00%1100.00%

#endif

Overall Contributors

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Daniel Vetter369100.00%3100.00%
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Directory: include/drm
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