2 * Copyright 2016 Intel Corp.
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24 #ifndef _DRM_VBLANK_H_
25 #define _DRM_VBLANK_H_
27 #include <linux/seqlock.h>
28 #include <linux/idr.h>
29 #include <linux/poll.h>
31 #include <drm/drm_file.h>
32 #include <drm/drm_modes.h>
38 * struct drm_pending_vblank_event - pending vblank event tracking
40 struct drm_pending_vblank_event {
42 * @base: Base structure for tracking pending DRM events.
44 struct drm_pending_event base;
46 * @pipe: drm_crtc_index() of the &drm_crtc this event is for.
50 * @sequence: frame event should be triggered at
54 * @event: Actual event which will be sent to userspace.
58 * @event.base: DRM event base class.
60 struct drm_event base;
65 * Event payload for vblank events, requested through
66 * either the MODE_PAGE_FLIP or MODE_ATOMIC IOCTL. Also
67 * generated by the legacy WAIT_VBLANK IOCTL, but new userspace
68 * should use MODE_QUEUE_SEQUENCE and &event.seq instead.
70 struct drm_event_vblank vbl;
73 * @event.seq: Event payload for the MODE_QUEUEU_SEQUENCE IOCTL.
75 struct drm_event_crtc_sequence seq;
80 * struct drm_vblank_crtc - vblank tracking for a CRTC
82 * This structure tracks the vblank state for one CRTC.
84 * Note that for historical reasons - the vblank handling code is still shared
85 * with legacy/non-kms drivers - this is a free-standing structure not directly
86 * connected to &struct drm_crtc. But all public interface functions are taking
87 * a &struct drm_crtc to hide this implementation detail.
89 struct drm_vblank_crtc {
91 * @dev: Pointer to the &drm_device.
93 struct drm_device *dev;
95 * @queue: Wait queue for vblank waiters.
97 wait_queue_head_t queue;
99 * @disable_timer: Disable timer for the delayed vblank disabling
100 * hysteresis logic. Vblank disabling is controlled through the
101 * drm_vblank_offdelay module option and the setting of the
102 * &drm_device.max_vblank_count value.
104 struct timer_list disable_timer;
107 * @seqlock: Protect vblank count and time.
112 * @count: Current software vblank counter.
116 * @time: Vblank timestamp corresponding to @count.
121 * @refcount: Number of users/waiters of the vblank interrupt. Only when
122 * this refcount reaches 0 can the hardware interrupt be disabled using
127 * @last: Protected by &drm_device.vbl_lock, used for wraparound handling.
133 * Maximum value of the vblank registers for this crtc. This value +1
134 * will result in a wrap-around of the vblank register. It is used
135 * by the vblank core to handle wrap-arounds.
137 * If set to zero the vblank core will try to guess the elapsed vblanks
138 * between times when the vblank interrupt is disabled through
139 * high-precision timestamps. That approach is suffering from small
140 * races and imprecision over longer time periods, hence exposing a
141 * hardware vblank counter is always recommended.
143 * This is the runtime configurable per-crtc maximum set through
144 * drm_crtc_set_max_vblank_count(). If this is used the driver
145 * must leave the device wide &drm_device.max_vblank_count at zero.
147 * If non-zero, &drm_crtc_funcs.get_vblank_counter must be set.
149 u32 max_vblank_count;
151 * @inmodeset: Tracks whether the vblank is disabled due to a modeset.
152 * For legacy driver bit 2 additionally tracks whether an additional
153 * temporary vblank reference has been acquired to paper over the
154 * hardware counter resetting/jumping. KMS drivers should instead just
155 * call drm_crtc_vblank_off() and drm_crtc_vblank_on(), which explicitly
156 * save and restore the vblank count.
158 unsigned int inmodeset;
160 * @pipe: drm_crtc_index() of the &drm_crtc corresponding to this
165 * @framedur_ns: Frame/Field duration in ns, used by
166 * drm_calc_vbltimestamp_from_scanoutpos() and computed by
167 * drm_calc_timestamping_constants().
171 * @linedur_ns: Line duration in ns, used by
172 * drm_calc_vbltimestamp_from_scanoutpos() and computed by
173 * drm_calc_timestamping_constants().
180 * Cache of the current hardware display mode. Only valid when @enabled
181 * is set. This is used by helpers like
182 * drm_calc_vbltimestamp_from_scanoutpos(). We can't just access the
183 * hardware mode by e.g. looking at &drm_crtc_state.adjusted_mode,
184 * because that one is really hard to get from interrupt context.
186 struct drm_display_mode hwmode;
189 * @enabled: Tracks the enabling state of the corresponding &drm_crtc to
190 * avoid double-disabling and hence corrupting saved state. Needed by
191 * drivers not using atomic KMS, since those might go through their CRTC
192 * disabling functions multiple times.
197 int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs);
198 u64 drm_crtc_vblank_count(struct drm_crtc *crtc);
199 u64 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc,
200 ktime_t *vblanktime);
201 void drm_crtc_send_vblank_event(struct drm_crtc *crtc,
202 struct drm_pending_vblank_event *e);
203 void drm_crtc_arm_vblank_event(struct drm_crtc *crtc,
204 struct drm_pending_vblank_event *e);
205 void drm_vblank_set_event(struct drm_pending_vblank_event *e,
208 bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe);
209 bool drm_crtc_handle_vblank(struct drm_crtc *crtc);
210 int drm_crtc_vblank_get(struct drm_crtc *crtc);
211 void drm_crtc_vblank_put(struct drm_crtc *crtc);
212 void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe);
213 void drm_crtc_wait_one_vblank(struct drm_crtc *crtc);
214 void drm_crtc_vblank_off(struct drm_crtc *crtc);
215 void drm_crtc_vblank_reset(struct drm_crtc *crtc);
216 void drm_crtc_vblank_on(struct drm_crtc *crtc);
217 u64 drm_crtc_accurate_vblank_count(struct drm_crtc *crtc);
218 void drm_vblank_restore(struct drm_device *dev, unsigned int pipe);
219 void drm_crtc_vblank_restore(struct drm_crtc *crtc);
221 bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
222 unsigned int pipe, int *max_error,
223 ktime_t *vblank_time,
225 void drm_calc_timestamping_constants(struct drm_crtc *crtc,
226 const struct drm_display_mode *mode);
227 wait_queue_head_t *drm_crtc_vblank_waitqueue(struct drm_crtc *crtc);
228 void drm_crtc_set_max_vblank_count(struct drm_crtc *crtc,
229 u32 max_vblank_count);