5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
10 * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
12 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * All Rights Reserved.
16 * Permission is hereby granted, free of charge, to any person obtaining a
17 * copy of this software and associated documentation files (the "Software"),
18 * to deal in the Software without restriction, including without limitation
19 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
20 * and/or sell copies of the Software, and to permit persons to whom the
21 * Software is furnished to do so, subject to the following conditions:
23 * The above copyright notice and this permission notice (including the next
24 * paragraph) shall be included in all copies or substantial portions of the
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
33 * OTHER DEALINGS IN THE SOFTWARE.
38 #include <linux/interrupt.h> /* For task queue support */
41 * Get interrupt from bus id.
43 * \param inode device inode.
44 * \param file_priv DRM file private.
46 * \param arg user argument, pointing to a drm_irq_busid structure.
47 * \return zero on success or a negative number on failure.
49 * Finds the PCI device with the specified bus id and gets its IRQ number.
50 * This IOCTL is deprecated, and will now return EINVAL for any busid not equal
51 * to that of the device that this DRM instance attached to.
53 int drm_irq_by_busid(struct drm_device
*dev
, void *data
,
54 struct drm_file
*file_priv
)
56 struct drm_irq_busid
*p
= data
;
58 if (!drm_core_check_feature(dev
, DRIVER_HAVE_IRQ
))
61 if ((p
->busnum
>> 8) != drm_get_pci_domain(dev
) ||
62 (p
->busnum
& 0xff) != dev
->pdev
->bus
->number
||
63 p
->devnum
!= PCI_SLOT(dev
->pdev
->devfn
) || p
->funcnum
!= PCI_FUNC(dev
->pdev
->devfn
))
66 p
->irq
= dev
->pdev
->irq
;
68 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p
->busnum
, p
->devnum
, p
->funcnum
,
74 static void vblank_disable_fn(unsigned long arg
)
76 struct drm_device
*dev
= (struct drm_device
*)arg
;
77 unsigned long irqflags
;
80 if (!dev
->vblank_disable_allowed
)
83 for (i
= 0; i
< dev
->num_crtcs
; i
++) {
84 spin_lock_irqsave(&dev
->vbl_lock
, irqflags
);
85 if (atomic_read(&dev
->vblank_refcount
[i
]) == 0 &&
86 dev
->vblank_enabled
[i
]) {
87 DRM_DEBUG("disabling vblank on crtc %d\n", i
);
89 dev
->driver
->get_vblank_counter(dev
, i
);
90 dev
->driver
->disable_vblank(dev
, i
);
91 dev
->vblank_enabled
[i
] = 0;
93 spin_unlock_irqrestore(&dev
->vbl_lock
, irqflags
);
97 void drm_vblank_cleanup(struct drm_device
*dev
)
99 /* Bail if the driver didn't call drm_vblank_init() */
100 if (dev
->num_crtcs
== 0)
103 del_timer(&dev
->vblank_disable_timer
);
105 vblank_disable_fn((unsigned long)dev
);
107 drm_free(dev
->vbl_queue
, sizeof(*dev
->vbl_queue
) * dev
->num_crtcs
,
109 drm_free(dev
->vbl_sigs
, sizeof(*dev
->vbl_sigs
) * dev
->num_crtcs
,
111 drm_free(dev
->_vblank_count
, sizeof(*dev
->_vblank_count
) *
112 dev
->num_crtcs
, DRM_MEM_DRIVER
);
113 drm_free(dev
->vblank_refcount
, sizeof(*dev
->vblank_refcount
) *
114 dev
->num_crtcs
, DRM_MEM_DRIVER
);
115 drm_free(dev
->vblank_enabled
, sizeof(*dev
->vblank_enabled
) *
116 dev
->num_crtcs
, DRM_MEM_DRIVER
);
117 drm_free(dev
->last_vblank
, sizeof(*dev
->last_vblank
) * dev
->num_crtcs
,
119 drm_free(dev
->last_vblank_wait
,
120 sizeof(*dev
->last_vblank_wait
) * dev
->num_crtcs
,
122 drm_free(dev
->vblank_inmodeset
, sizeof(*dev
->vblank_inmodeset
) *
123 dev
->num_crtcs
, DRM_MEM_DRIVER
);
128 int drm_vblank_init(struct drm_device
*dev
, int num_crtcs
)
130 int i
, ret
= -ENOMEM
;
132 setup_timer(&dev
->vblank_disable_timer
, vblank_disable_fn
,
134 spin_lock_init(&dev
->vbl_lock
);
135 atomic_set(&dev
->vbl_signal_pending
, 0);
136 dev
->num_crtcs
= num_crtcs
;
138 dev
->vbl_queue
= drm_alloc(sizeof(wait_queue_head_t
) * num_crtcs
,
143 dev
->vbl_sigs
= drm_alloc(sizeof(struct list_head
) * num_crtcs
,
148 dev
->_vblank_count
= drm_alloc(sizeof(atomic_t
) * num_crtcs
,
150 if (!dev
->_vblank_count
)
153 dev
->vblank_refcount
= drm_alloc(sizeof(atomic_t
) * num_crtcs
,
155 if (!dev
->vblank_refcount
)
158 dev
->vblank_enabled
= drm_calloc(num_crtcs
, sizeof(int),
160 if (!dev
->vblank_enabled
)
163 dev
->last_vblank
= drm_calloc(num_crtcs
, sizeof(u32
), DRM_MEM_DRIVER
);
164 if (!dev
->last_vblank
)
167 dev
->last_vblank_wait
= drm_calloc(num_crtcs
, sizeof(u32
),
169 if (!dev
->last_vblank_wait
)
172 dev
->vblank_inmodeset
= drm_calloc(num_crtcs
, sizeof(int),
174 if (!dev
->vblank_inmodeset
)
177 /* Zero per-crtc vblank stuff */
178 for (i
= 0; i
< num_crtcs
; i
++) {
179 init_waitqueue_head(&dev
->vbl_queue
[i
]);
180 INIT_LIST_HEAD(&dev
->vbl_sigs
[i
]);
181 atomic_set(&dev
->_vblank_count
[i
], 0);
182 atomic_set(&dev
->vblank_refcount
[i
], 0);
185 dev
->vblank_disable_allowed
= 0;
190 drm_vblank_cleanup(dev
);
193 EXPORT_SYMBOL(drm_vblank_init
);
196 * Install IRQ handler.
198 * \param dev DRM device.
200 * Initializes the IRQ related data. Installs the handler, calling the driver
201 * \c drm_driver_irq_preinstall() and \c drm_driver_irq_postinstall() functions
202 * before and after the installation.
204 int drm_irq_install(struct drm_device
*dev
)
207 unsigned long sh_flags
= 0;
209 if (!drm_core_check_feature(dev
, DRIVER_HAVE_IRQ
))
212 if (dev
->pdev
->irq
== 0)
215 mutex_lock(&dev
->struct_mutex
);
217 /* Driver must have been initialized */
218 if (!dev
->dev_private
) {
219 mutex_unlock(&dev
->struct_mutex
);
223 if (dev
->irq_enabled
) {
224 mutex_unlock(&dev
->struct_mutex
);
227 dev
->irq_enabled
= 1;
228 mutex_unlock(&dev
->struct_mutex
);
230 DRM_DEBUG("irq=%d\n", dev
->pdev
->irq
);
232 /* Before installing handler */
233 dev
->driver
->irq_preinstall(dev
);
235 /* Install handler */
236 if (drm_core_check_feature(dev
, DRIVER_IRQ_SHARED
))
237 sh_flags
= IRQF_SHARED
;
239 ret
= request_irq(drm_dev_to_irq(dev
), dev
->driver
->irq_handler
,
240 sh_flags
, dev
->devname
, dev
);
243 mutex_lock(&dev
->struct_mutex
);
244 dev
->irq_enabled
= 0;
245 mutex_unlock(&dev
->struct_mutex
);
249 /* After installing handler */
250 ret
= dev
->driver
->irq_postinstall(dev
);
252 mutex_lock(&dev
->struct_mutex
);
253 dev
->irq_enabled
= 0;
254 mutex_unlock(&dev
->struct_mutex
);
259 EXPORT_SYMBOL(drm_irq_install
);
262 * Uninstall the IRQ handler.
264 * \param dev DRM device.
266 * Calls the driver's \c drm_driver_irq_uninstall() function, and stops the irq.
268 int drm_irq_uninstall(struct drm_device
* dev
)
270 unsigned long irqflags
;
273 if (!drm_core_check_feature(dev
, DRIVER_HAVE_IRQ
))
276 mutex_lock(&dev
->struct_mutex
);
277 irq_enabled
= dev
->irq_enabled
;
278 dev
->irq_enabled
= 0;
279 mutex_unlock(&dev
->struct_mutex
);
282 * Wake up any waiters so they don't hang.
284 spin_lock_irqsave(&dev
->vbl_lock
, irqflags
);
285 for (i
= 0; i
< dev
->num_crtcs
; i
++) {
286 DRM_WAKEUP(&dev
->vbl_queue
[i
]);
287 dev
->vblank_enabled
[i
] = 0;
289 spin_unlock_irqrestore(&dev
->vbl_lock
, irqflags
);
294 DRM_DEBUG("irq=%d\n", dev
->pdev
->irq
);
296 dev
->driver
->irq_uninstall(dev
);
298 free_irq(dev
->pdev
->irq
, dev
);
302 EXPORT_SYMBOL(drm_irq_uninstall
);
307 * \param inode device inode.
308 * \param file_priv DRM file private.
309 * \param cmd command.
310 * \param arg user argument, pointing to a drm_control structure.
311 * \return zero on success or a negative number on failure.
313 * Calls irq_install() or irq_uninstall() according to \p arg.
315 int drm_control(struct drm_device
*dev
, void *data
,
316 struct drm_file
*file_priv
)
318 struct drm_control
*ctl
= data
;
320 /* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */
324 case DRM_INST_HANDLER
:
325 if (!drm_core_check_feature(dev
, DRIVER_HAVE_IRQ
))
327 if (drm_core_check_feature(dev
, DRIVER_MODESET
))
329 if (dev
->if_version
< DRM_IF_VERSION(1, 2) &&
330 ctl
->irq
!= dev
->pdev
->irq
)
332 return drm_irq_install(dev
);
333 case DRM_UNINST_HANDLER
:
334 if (!drm_core_check_feature(dev
, DRIVER_HAVE_IRQ
))
336 if (drm_core_check_feature(dev
, DRIVER_MODESET
))
338 return drm_irq_uninstall(dev
);
345 * drm_vblank_count - retrieve "cooked" vblank counter value
347 * @crtc: which counter to retrieve
349 * Fetches the "cooked" vblank count value that represents the number of
350 * vblank events since the system was booted, including lost events due to
351 * modesetting activity.
353 u32
drm_vblank_count(struct drm_device
*dev
, int crtc
)
355 return atomic_read(&dev
->_vblank_count
[crtc
]);
357 EXPORT_SYMBOL(drm_vblank_count
);
360 * drm_update_vblank_count - update the master vblank counter
362 * @crtc: counter to update
364 * Call back into the driver to update the appropriate vblank counter
365 * (specified by @crtc). Deal with wraparound, if it occurred, and
366 * update the last read value so we can deal with wraparound on the next
369 * Only necessary when going from off->on, to account for frames we
370 * didn't get an interrupt for.
372 * Note: caller must hold dev->vbl_lock since this reads & writes
373 * device vblank fields.
375 static void drm_update_vblank_count(struct drm_device
*dev
, int crtc
)
377 u32 cur_vblank
, diff
;
380 * Interrupts were disabled prior to this call, so deal with counter
382 * NOTE! It's possible we lost a full dev->max_vblank_count events
383 * here if the register is small or we had vblank interrupts off for
386 cur_vblank
= dev
->driver
->get_vblank_counter(dev
, crtc
);
387 diff
= cur_vblank
- dev
->last_vblank
[crtc
];
388 if (cur_vblank
< dev
->last_vblank
[crtc
]) {
389 diff
+= dev
->max_vblank_count
;
391 DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n",
392 crtc
, dev
->last_vblank
[crtc
], cur_vblank
, diff
);
395 DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n",
398 atomic_add(diff
, &dev
->_vblank_count
[crtc
]);
402 * drm_vblank_get - get a reference count on vblank events
404 * @crtc: which CRTC to own
406 * Acquire a reference count on vblank events to avoid having them disabled
410 * Zero on success, nonzero on failure.
412 int drm_vblank_get(struct drm_device
*dev
, int crtc
)
414 unsigned long irqflags
;
417 spin_lock_irqsave(&dev
->vbl_lock
, irqflags
);
418 /* Going from 0->1 means we have to enable interrupts again */
419 if (atomic_add_return(1, &dev
->vblank_refcount
[crtc
]) == 1 &&
420 !dev
->vblank_enabled
[crtc
]) {
421 ret
= dev
->driver
->enable_vblank(dev
, crtc
);
422 DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", crtc
, ret
);
424 atomic_dec(&dev
->vblank_refcount
[crtc
]);
426 dev
->vblank_enabled
[crtc
] = 1;
427 drm_update_vblank_count(dev
, crtc
);
430 spin_unlock_irqrestore(&dev
->vbl_lock
, irqflags
);
434 EXPORT_SYMBOL(drm_vblank_get
);
437 * drm_vblank_put - give up ownership of vblank events
439 * @crtc: which counter to give up
441 * Release ownership of a given vblank counter, turning off interrupts
444 void drm_vblank_put(struct drm_device
*dev
, int crtc
)
446 /* Last user schedules interrupt disable */
447 if (atomic_dec_and_test(&dev
->vblank_refcount
[crtc
]))
448 mod_timer(&dev
->vblank_disable_timer
, jiffies
+ 5*DRM_HZ
);
450 EXPORT_SYMBOL(drm_vblank_put
);
453 * drm_vblank_pre_modeset - account for vblanks across mode sets
455 * @crtc: CRTC in question
456 * @post: post or pre mode set?
458 * Account for vblank events across mode setting events, which will likely
459 * reset the hardware frame counter.
461 void drm_vblank_pre_modeset(struct drm_device
*dev
, int crtc
)
464 * To avoid all the problems that might happen if interrupts
465 * were enabled/disabled around or between these calls, we just
466 * have the kernel take a reference on the CRTC (just once though
467 * to avoid corrupting the count if multiple, mismatch calls occur),
468 * so that interrupts remain enabled in the interim.
470 if (!dev
->vblank_inmodeset
[crtc
]) {
471 dev
->vblank_inmodeset
[crtc
] = 1;
472 drm_vblank_get(dev
, crtc
);
475 EXPORT_SYMBOL(drm_vblank_pre_modeset
);
477 void drm_vblank_post_modeset(struct drm_device
*dev
, int crtc
)
479 unsigned long irqflags
;
481 if (dev
->vblank_inmodeset
[crtc
]) {
482 spin_lock_irqsave(&dev
->vbl_lock
, irqflags
);
483 dev
->vblank_disable_allowed
= 1;
484 dev
->vblank_inmodeset
[crtc
] = 0;
485 spin_unlock_irqrestore(&dev
->vbl_lock
, irqflags
);
486 drm_vblank_put(dev
, crtc
);
489 EXPORT_SYMBOL(drm_vblank_post_modeset
);
492 * drm_modeset_ctl - handle vblank event counter changes across mode switch
493 * @DRM_IOCTL_ARGS: standard ioctl arguments
495 * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET
496 * ioctls around modesetting so that any lost vblank events are accounted for.
498 * Generally the counter will reset across mode sets. If interrupts are
499 * enabled around this call, we don't have to do anything since the counter
500 * will have already been incremented.
502 int drm_modeset_ctl(struct drm_device
*dev
, void *data
,
503 struct drm_file
*file_priv
)
505 struct drm_modeset_ctl
*modeset
= data
;
508 /* If drm_vblank_init() hasn't been called yet, just no-op */
512 crtc
= modeset
->crtc
;
513 if (crtc
>= dev
->num_crtcs
) {
518 switch (modeset
->cmd
) {
519 case _DRM_PRE_MODESET
:
520 drm_vblank_pre_modeset(dev
, crtc
);
522 case _DRM_POST_MODESET
:
523 drm_vblank_post_modeset(dev
, crtc
);
537 * \param inode device inode.
538 * \param file_priv DRM file private.
539 * \param cmd command.
540 * \param data user argument, pointing to a drm_wait_vblank structure.
541 * \return zero on success or a negative number on failure.
543 * Verifies the IRQ is installed.
545 * If a signal is requested checks if this task has already scheduled the same signal
546 * for the same vblank sequence number - nothing to be done in
547 * that case. If the number of tasks waiting for the interrupt exceeds 100 the
548 * function fails. Otherwise adds a new entry to drm_device::vbl_sigs for this
551 * If a signal is not requested, then calls vblank_wait().
553 int drm_wait_vblank(struct drm_device
*dev
, void *data
,
554 struct drm_file
*file_priv
)
556 union drm_wait_vblank
*vblwait
= data
;
558 unsigned int flags
, seq
, crtc
;
560 if ((!dev
->pdev
->irq
) || (!dev
->irq_enabled
))
563 if (vblwait
->request
.type
&
564 ~(_DRM_VBLANK_TYPES_MASK
| _DRM_VBLANK_FLAGS_MASK
)) {
565 DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
566 vblwait
->request
.type
,
567 (_DRM_VBLANK_TYPES_MASK
| _DRM_VBLANK_FLAGS_MASK
));
571 flags
= vblwait
->request
.type
& _DRM_VBLANK_FLAGS_MASK
;
572 crtc
= flags
& _DRM_VBLANK_SECONDARY
? 1 : 0;
574 if (crtc
>= dev
->num_crtcs
)
577 ret
= drm_vblank_get(dev
, crtc
);
579 DRM_ERROR("failed to acquire vblank counter, %d\n", ret
);
582 seq
= drm_vblank_count(dev
, crtc
);
584 switch (vblwait
->request
.type
& _DRM_VBLANK_TYPES_MASK
) {
585 case _DRM_VBLANK_RELATIVE
:
586 vblwait
->request
.sequence
+= seq
;
587 vblwait
->request
.type
&= ~_DRM_VBLANK_RELATIVE
;
588 case _DRM_VBLANK_ABSOLUTE
:
595 if ((flags
& _DRM_VBLANK_NEXTONMISS
) &&
596 (seq
- vblwait
->request
.sequence
) <= (1<<23)) {
597 vblwait
->request
.sequence
= seq
+ 1;
600 if (flags
& _DRM_VBLANK_SIGNAL
) {
601 unsigned long irqflags
;
602 struct list_head
*vbl_sigs
= &dev
->vbl_sigs
[crtc
];
603 struct drm_vbl_sig
*vbl_sig
;
605 spin_lock_irqsave(&dev
->vbl_lock
, irqflags
);
607 /* Check if this task has already scheduled the same signal
608 * for the same vblank sequence number; nothing to be done in
611 list_for_each_entry(vbl_sig
, vbl_sigs
, head
) {
612 if (vbl_sig
->sequence
== vblwait
->request
.sequence
613 && vbl_sig
->info
.si_signo
==
614 vblwait
->request
.signal
615 && vbl_sig
->task
== current
) {
616 spin_unlock_irqrestore(&dev
->vbl_lock
,
618 vblwait
->reply
.sequence
= seq
;
623 if (atomic_read(&dev
->vbl_signal_pending
) >= 100) {
624 spin_unlock_irqrestore(&dev
->vbl_lock
, irqflags
);
629 spin_unlock_irqrestore(&dev
->vbl_lock
, irqflags
);
631 vbl_sig
= drm_calloc(1, sizeof(struct drm_vbl_sig
),
638 /* Get a refcount on the vblank, which will be released by
639 * drm_vbl_send_signals().
641 ret
= drm_vblank_get(dev
, crtc
);
643 drm_free(vbl_sig
, sizeof(struct drm_vbl_sig
),
648 atomic_inc(&dev
->vbl_signal_pending
);
650 vbl_sig
->sequence
= vblwait
->request
.sequence
;
651 vbl_sig
->info
.si_signo
= vblwait
->request
.signal
;
652 vbl_sig
->task
= current
;
654 spin_lock_irqsave(&dev
->vbl_lock
, irqflags
);
656 list_add_tail(&vbl_sig
->head
, vbl_sigs
);
658 spin_unlock_irqrestore(&dev
->vbl_lock
, irqflags
);
660 vblwait
->reply
.sequence
= seq
;
662 DRM_DEBUG("waiting on vblank count %d, crtc %d\n",
663 vblwait
->request
.sequence
, crtc
);
664 dev
->last_vblank_wait
[crtc
] = vblwait
->request
.sequence
;
665 DRM_WAIT_ON(ret
, dev
->vbl_queue
[crtc
], 3 * DRM_HZ
,
666 (((drm_vblank_count(dev
, crtc
) -
667 vblwait
->request
.sequence
) <= (1 << 23)) ||
673 do_gettimeofday(&now
);
675 vblwait
->reply
.tval_sec
= now
.tv_sec
;
676 vblwait
->reply
.tval_usec
= now
.tv_usec
;
677 vblwait
->reply
.sequence
= drm_vblank_count(dev
, crtc
);
678 DRM_DEBUG("returning %d to client\n",
679 vblwait
->reply
.sequence
);
681 DRM_DEBUG("vblank wait interrupted by signal\n");
686 drm_vblank_put(dev
, crtc
);
691 * Send the VBLANK signals.
693 * \param dev DRM device.
694 * \param crtc CRTC where the vblank event occurred
696 * Sends a signal for each task in drm_device::vbl_sigs and empties the list.
698 * If a signal is not requested, then calls vblank_wait().
700 static void drm_vbl_send_signals(struct drm_device
*dev
, int crtc
)
702 struct drm_vbl_sig
*vbl_sig
, *tmp
;
703 struct list_head
*vbl_sigs
;
704 unsigned int vbl_seq
;
707 spin_lock_irqsave(&dev
->vbl_lock
, flags
);
709 vbl_sigs
= &dev
->vbl_sigs
[crtc
];
710 vbl_seq
= drm_vblank_count(dev
, crtc
);
712 list_for_each_entry_safe(vbl_sig
, tmp
, vbl_sigs
, head
) {
713 if ((vbl_seq
- vbl_sig
->sequence
) <= (1 << 23)) {
714 vbl_sig
->info
.si_code
= vbl_seq
;
715 send_sig_info(vbl_sig
->info
.si_signo
,
716 &vbl_sig
->info
, vbl_sig
->task
);
718 list_del(&vbl_sig
->head
);
720 drm_free(vbl_sig
, sizeof(*vbl_sig
),
722 atomic_dec(&dev
->vbl_signal_pending
);
723 drm_vblank_put(dev
, crtc
);
727 spin_unlock_irqrestore(&dev
->vbl_lock
, flags
);
731 * drm_handle_vblank - handle a vblank event
733 * @crtc: where this event occurred
735 * Drivers should call this routine in their vblank interrupt handlers to
736 * update the vblank counter and send any signals that may be pending.
738 void drm_handle_vblank(struct drm_device
*dev
, int crtc
)
740 atomic_inc(&dev
->_vblank_count
[crtc
]);
741 DRM_WAKEUP(&dev
->vbl_queue
[crtc
]);
742 drm_vbl_send_signals(dev
, crtc
);
744 EXPORT_SYMBOL(drm_handle_vblank
);