Commit | Line | Data |
---|---|---|
f5752b38 DV |
1 | /* |
2 | * drm_irq.c IRQ and vblank support | |
1da177e4 LT |
3 | * |
4 | * \author Rickard E. (Rik) Faith <faith@valinux.com> | |
5 | * \author Gareth Hughes <gareth@valinux.com> | |
6 | */ | |
7 | ||
8 | /* | |
9 | * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com | |
10 | * | |
11 | * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. | |
12 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. | |
13 | * All Rights Reserved. | |
14 | * | |
15 | * Permission is hereby granted, free of charge, to any person obtaining a | |
16 | * copy of this software and associated documentation files (the "Software"), | |
17 | * to deal in the Software without restriction, including without limitation | |
18 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
19 | * and/or sell copies of the Software, and to permit persons to whom the | |
20 | * Software is furnished to do so, subject to the following conditions: | |
21 | * | |
22 | * The above copyright notice and this permission notice (including the next | |
23 | * paragraph) shall be included in all copies or substantial portions of the | |
24 | * Software. | |
25 | * | |
26 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
27 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
28 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
29 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
30 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
31 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
32 | * OTHER DEALINGS IN THE SOFTWARE. | |
33 | */ | |
34 | ||
760285e7 | 35 | #include <drm/drmP.h> |
ac2874b9 | 36 | #include "drm_trace.h" |
18882995 | 37 | #include "drm_internal.h" |
1da177e4 LT |
38 | |
39 | #include <linux/interrupt.h> /* For task queue support */ | |
5a0e3ad6 | 40 | #include <linux/slab.h> |
1da177e4 | 41 | |
28d52043 | 42 | #include <linux/vgaarb.h> |
2d1a8a48 | 43 | #include <linux/export.h> |
27641c3f MK |
44 | |
45 | /* Access macro for slots in vblank timestamp ringbuffer. */ | |
cc1ef118 TR |
46 | #define vblanktimestamp(dev, pipe, count) \ |
47 | ((dev)->vblank[pipe].time[(count) % DRM_VBLANKTIME_RBSIZE]) | |
27641c3f MK |
48 | |
49 | /* Retry timestamp calculation up to 3 times to satisfy | |
50 | * drm_timestamp_precision before giving up. | |
51 | */ | |
52 | #define DRM_TIMESTAMP_MAXRETRIES 3 | |
53 | ||
54 | /* Threshold in nanoseconds for detection of redundant | |
55 | * vblank irq in drm_handle_vblank(). 1 msec should be ok. | |
56 | */ | |
57 | #define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000 | |
58 | ||
fb446a1a | 59 | static bool |
cc1ef118 | 60 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, |
fb446a1a DV |
61 | struct timeval *tvblank, unsigned flags); |
62 | ||
18882995 DV |
63 | static unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */ |
64 | ||
65 | /* | |
66 | * Default to use monotonic timestamps for wait-for-vblank and page-flip | |
67 | * complete events. | |
68 | */ | |
69 | unsigned int drm_timestamp_monotonic = 1; | |
70 | ||
71 | static int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */ | |
72 | ||
73 | module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600); | |
74 | module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600); | |
75 | module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600); | |
76 | ||
1da248a5 | 77 | static void store_vblank(struct drm_device *dev, unsigned int pipe, |
209e4dbc | 78 | u32 vblank_count_inc, |
99264a61 DV |
79 | struct timeval *t_vblank) |
80 | { | |
1da248a5 | 81 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
99264a61 DV |
82 | u32 tslot; |
83 | ||
84 | assert_spin_locked(&dev->vblank_time_lock); | |
85 | ||
86 | if (t_vblank) { | |
87 | /* All writers hold the spinlock, but readers are serialized by | |
88 | * the latching of vblank->count below. | |
89 | */ | |
90 | tslot = vblank->count + vblank_count_inc; | |
1da248a5 | 91 | vblanktimestamp(dev, pipe, tslot) = *t_vblank; |
99264a61 DV |
92 | } |
93 | ||
94 | /* | |
95 | * vblank timestamp updates are protected on the write side with | |
96 | * vblank_time_lock, but on the read side done locklessly using a | |
97 | * sequence-lock on the vblank counter. Ensure correct ordering using | |
98 | * memory barrriers. We need the barrier both before and also after the | |
99 | * counter update to synchronize with the next timestamp write. | |
100 | * The read-side barriers for this are in drm_vblank_count_and_time. | |
101 | */ | |
102 | smp_wmb(); | |
103 | vblank->count += vblank_count_inc; | |
104 | smp_wmb(); | |
105 | } | |
106 | ||
13b030af VS |
107 | /** |
108 | * drm_update_vblank_count - update the master vblank counter | |
109 | * @dev: DRM device | |
cc1ef118 | 110 | * @pipe: counter to update |
13b030af VS |
111 | * |
112 | * Call back into the driver to update the appropriate vblank counter | |
1da248a5 | 113 | * (specified by @pipe). Deal with wraparound, if it occurred, and |
13b030af VS |
114 | * update the last read value so we can deal with wraparound on the next |
115 | * call if necessary. | |
116 | * | |
117 | * Only necessary when going from off->on, to account for frames we | |
118 | * didn't get an interrupt for. | |
119 | * | |
120 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
121 | * device vblank fields. | |
122 | */ | |
cc1ef118 | 123 | static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe) |
13b030af | 124 | { |
cc1ef118 | 125 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
99264a61 | 126 | u32 cur_vblank, diff; |
fb446a1a | 127 | bool rc; |
13b030af VS |
128 | struct timeval t_vblank; |
129 | ||
130 | /* | |
131 | * Interrupts were disabled prior to this call, so deal with counter | |
132 | * wrap if needed. | |
5ceecb2f | 133 | * NOTE! It's possible we lost a full dev->max_vblank_count + 1 events |
13b030af VS |
134 | * here if the register is small or we had vblank interrupts off for |
135 | * a long time. | |
136 | * | |
137 | * We repeat the hardware vblank counter & timestamp query until | |
138 | * we get consistent results. This to prevent races between gpu | |
139 | * updating its hardware counter while we are retrieving the | |
140 | * corresponding vblank timestamp. | |
141 | */ | |
142 | do { | |
cc1ef118 TR |
143 | cur_vblank = dev->driver->get_vblank_counter(dev, pipe); |
144 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, 0); | |
145 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, pipe)); | |
13b030af VS |
146 | |
147 | /* Deal with counter wrap */ | |
8a51d5be VS |
148 | diff = cur_vblank - vblank->last; |
149 | if (cur_vblank < vblank->last) { | |
5ceecb2f | 150 | diff += dev->max_vblank_count + 1; |
13b030af | 151 | |
cc1ef118 TR |
152 | DRM_DEBUG("last_vblank[%u]=0x%x, cur_vblank=0x%x => diff=0x%x\n", |
153 | pipe, vblank->last, cur_vblank, diff); | |
13b030af VS |
154 | } |
155 | ||
cc1ef118 TR |
156 | DRM_DEBUG("updating vblank count on crtc %u, missed %d\n", |
157 | pipe, diff); | |
13b030af | 158 | |
da8f4396 MK |
159 | if (diff == 0) |
160 | return; | |
161 | ||
99264a61 DV |
162 | /* |
163 | * Only reinitialize corresponding vblank timestamp if high-precision query | |
d66a1e38 MK |
164 | * available and didn't fail. Otherwise reinitialize delayed at next vblank |
165 | * interrupt and assign 0 for now, to mark the vblanktimestamp as invalid. | |
13b030af | 166 | */ |
d66a1e38 MK |
167 | if (!rc) |
168 | t_vblank = (struct timeval) {0, 0}; | |
169 | ||
cc1ef118 | 170 | store_vblank(dev, pipe, diff, &t_vblank); |
13b030af VS |
171 | } |
172 | ||
27641c3f MK |
173 | /* |
174 | * Disable vblank irq's on crtc, make sure that last vblank count | |
175 | * of hardware and corresponding consistent software vblank counter | |
176 | * are preserved, even if there are any spurious vblank irq's after | |
177 | * disable. | |
178 | */ | |
cc1ef118 | 179 | static void vblank_disable_and_save(struct drm_device *dev, unsigned int pipe) |
27641c3f | 180 | { |
cc1ef118 | 181 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
27641c3f MK |
182 | unsigned long irqflags; |
183 | u32 vblcount; | |
184 | s64 diff_ns; | |
fb446a1a | 185 | bool vblrc; |
27641c3f | 186 | struct timeval tvblank; |
0355cf3a | 187 | int count = DRM_TIMESTAMP_MAXRETRIES; |
27641c3f MK |
188 | |
189 | /* Prevent vblank irq processing while disabling vblank irqs, | |
190 | * so no updates of timestamps or count can happen after we've | |
191 | * disabled. Needed to prevent races in case of delayed irq's. | |
27641c3f | 192 | */ |
27641c3f MK |
193 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); |
194 | ||
812e7465 | 195 | /* |
393e872e | 196 | * If the vblank interrupt was already disabled update the count |
812e7465 VS |
197 | * and timestamp to maintain the appearance that the counter |
198 | * has been ticking all along until this time. This makes the | |
199 | * count account for the entire time between drm_vblank_on() and | |
200 | * drm_vblank_off(). | |
855d30b4 DV |
201 | * |
202 | * But only do this if precise vblank timestamps are available. | |
203 | * Otherwise we might read a totally bogus timestamp since drivers | |
204 | * lacking precise timestamp support rely upon sampling the system clock | |
205 | * at vblank interrupt time. Which obviously won't work out well if the | |
206 | * vblank interrupt is disabled. | |
812e7465 | 207 | */ |
855d30b4 | 208 | if (!vblank->enabled && |
cc1ef118 TR |
209 | drm_get_last_vbltimestamp(dev, pipe, &tvblank, 0)) { |
210 | drm_update_vblank_count(dev, pipe); | |
812e7465 VS |
211 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); |
212 | return; | |
213 | } | |
214 | ||
eb2ed66f LP |
215 | /* |
216 | * Only disable vblank interrupts if they're enabled. This avoids | |
217 | * calling the ->disable_vblank() operation in atomic context with the | |
218 | * hardware potentially runtime suspended. | |
219 | */ | |
220 | if (vblank->enabled) { | |
cc1ef118 | 221 | dev->driver->disable_vblank(dev, pipe); |
eb2ed66f LP |
222 | vblank->enabled = false; |
223 | } | |
27641c3f MK |
224 | |
225 | /* No further vblank irq's will be processed after | |
226 | * this point. Get current hardware vblank count and | |
227 | * vblank timestamp, repeat until they are consistent. | |
228 | * | |
229 | * FIXME: There is still a race condition here and in | |
230 | * drm_update_vblank_count() which can cause off-by-one | |
231 | * reinitialization of software vblank counter. If gpu | |
232 | * vblank counter doesn't increment exactly at the leading | |
233 | * edge of a vblank interval, then we can lose 1 count if | |
234 | * we happen to execute between start of vblank and the | |
235 | * delayed gpu counter increment. | |
236 | */ | |
237 | do { | |
cc1ef118 TR |
238 | vblank->last = dev->driver->get_vblank_counter(dev, pipe); |
239 | vblrc = drm_get_last_vbltimestamp(dev, pipe, &tvblank, 0); | |
240 | } while (vblank->last != dev->driver->get_vblank_counter(dev, pipe) && (--count) && vblrc); | |
0355cf3a EE |
241 | |
242 | if (!count) | |
243 | vblrc = 0; | |
27641c3f MK |
244 | |
245 | /* Compute time difference to stored timestamp of last vblank | |
246 | * as updated by last invocation of drm_handle_vblank() in vblank irq. | |
247 | */ | |
99264a61 | 248 | vblcount = vblank->count; |
27641c3f | 249 | diff_ns = timeval_to_ns(&tvblank) - |
cc1ef118 | 250 | timeval_to_ns(&vblanktimestamp(dev, pipe, vblcount)); |
27641c3f MK |
251 | |
252 | /* If there is at least 1 msec difference between the last stored | |
253 | * timestamp and tvblank, then we are currently executing our | |
254 | * disable inside a new vblank interval, the tvblank timestamp | |
255 | * corresponds to this new vblank interval and the irq handler | |
256 | * for this vblank didn't run yet and won't run due to our disable. | |
257 | * Therefore we need to do the job of drm_handle_vblank() and | |
258 | * increment the vblank counter by one to account for this vblank. | |
259 | * | |
260 | * Skip this step if there isn't any high precision timestamp | |
261 | * available. In that case we can't account for this and just | |
262 | * hope for the best. | |
263 | */ | |
99264a61 | 264 | if (vblrc && (abs64(diff_ns) > 1000000)) |
cc1ef118 | 265 | store_vblank(dev, pipe, 1, &tvblank); |
27641c3f | 266 | |
27641c3f | 267 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); |
27641c3f MK |
268 | } |
269 | ||
0a3e67a4 JB |
270 | static void vblank_disable_fn(unsigned long arg) |
271 | { | |
e69595c2 VS |
272 | struct drm_vblank_crtc *vblank = (void *)arg; |
273 | struct drm_device *dev = vblank->dev; | |
cc1ef118 | 274 | unsigned int pipe = vblank->pipe; |
0a3e67a4 | 275 | unsigned long irqflags; |
0a3e67a4 JB |
276 | |
277 | if (!dev->vblank_disable_allowed) | |
278 | return; | |
279 | ||
e69595c2 VS |
280 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
281 | if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) { | |
cc1ef118 TR |
282 | DRM_DEBUG("disabling vblank on crtc %u\n", pipe); |
283 | vblank_disable_and_save(dev, pipe); | |
0a3e67a4 | 284 | } |
e69595c2 | 285 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
0a3e67a4 JB |
286 | } |
287 | ||
f5752b38 DV |
288 | /** |
289 | * drm_vblank_cleanup - cleanup vblank support | |
290 | * @dev: DRM device | |
291 | * | |
292 | * This function cleans up any resources allocated in drm_vblank_init. | |
293 | */ | |
52440211 | 294 | void drm_vblank_cleanup(struct drm_device *dev) |
0a3e67a4 | 295 | { |
cc1ef118 | 296 | unsigned int pipe; |
e69595c2 | 297 | |
0a3e67a4 JB |
298 | /* Bail if the driver didn't call drm_vblank_init() */ |
299 | if (dev->num_crtcs == 0) | |
300 | return; | |
301 | ||
cc1ef118 TR |
302 | for (pipe = 0; pipe < dev->num_crtcs; pipe++) { |
303 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
8a51d5be | 304 | |
3bff93d6 DV |
305 | WARN_ON(vblank->enabled && |
306 | drm_core_check_feature(dev, DRIVER_MODESET)); | |
2368ffb1 | 307 | |
3bff93d6 | 308 | del_timer_sync(&vblank->disable_timer); |
e69595c2 | 309 | } |
0a3e67a4 | 310 | |
5380e929 | 311 | kfree(dev->vblank); |
0a3e67a4 JB |
312 | |
313 | dev->num_crtcs = 0; | |
314 | } | |
e77cef9c | 315 | EXPORT_SYMBOL(drm_vblank_cleanup); |
0a3e67a4 | 316 | |
f5752b38 DV |
317 | /** |
318 | * drm_vblank_init - initialize vblank support | |
cc1ef118 TR |
319 | * @dev: DRM device |
320 | * @num_crtcs: number of CRTCs supported by @dev | |
f5752b38 DV |
321 | * |
322 | * This function initializes vblank support for @num_crtcs display pipelines. | |
323 | * | |
324 | * Returns: | |
325 | * Zero on success or a negative error code on failure. | |
326 | */ | |
cc1ef118 | 327 | int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs) |
0a3e67a4 | 328 | { |
cc1ef118 TR |
329 | int ret = -ENOMEM; |
330 | unsigned int i; | |
0a3e67a4 | 331 | |
0a3e67a4 | 332 | spin_lock_init(&dev->vbl_lock); |
27641c3f MK |
333 | spin_lock_init(&dev->vblank_time_lock); |
334 | ||
0a3e67a4 JB |
335 | dev->num_crtcs = num_crtcs; |
336 | ||
5380e929 VS |
337 | dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL); |
338 | if (!dev->vblank) | |
0a3e67a4 JB |
339 | goto err; |
340 | ||
e69595c2 | 341 | for (i = 0; i < num_crtcs; i++) { |
8a51d5be VS |
342 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
343 | ||
344 | vblank->dev = dev; | |
cc1ef118 | 345 | vblank->pipe = i; |
8a51d5be VS |
346 | init_waitqueue_head(&vblank->queue); |
347 | setup_timer(&vblank->disable_timer, vblank_disable_fn, | |
348 | (unsigned long)vblank); | |
e69595c2 | 349 | } |
27641c3f | 350 | |
8f6fce03 | 351 | DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n"); |
27641c3f MK |
352 | |
353 | /* Driver specific high-precision vblank timestamping supported? */ | |
354 | if (dev->driver->get_vblank_timestamp) | |
355 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); | |
356 | else | |
357 | DRM_INFO("No driver support for vblank timestamp query.\n"); | |
358 | ||
5a8b21b2 MK |
359 | /* Must have precise timestamping for reliable vblank instant disable */ |
360 | if (dev->vblank_disable_immediate && !dev->driver->get_vblank_timestamp) { | |
361 | dev->vblank_disable_immediate = false; | |
362 | DRM_INFO("Setting vblank_disable_immediate to false because " | |
363 | "get_vblank_timestamp == NULL\n"); | |
364 | } | |
365 | ||
ba0bf120 VS |
366 | dev->vblank_disable_allowed = false; |
367 | ||
0a3e67a4 JB |
368 | return 0; |
369 | ||
370 | err: | |
79a093ae | 371 | dev->num_crtcs = 0; |
0a3e67a4 JB |
372 | return ret; |
373 | } | |
374 | EXPORT_SYMBOL(drm_vblank_init); | |
375 | ||
28d52043 DA |
376 | static void drm_irq_vgaarb_nokms(void *cookie, bool state) |
377 | { | |
378 | struct drm_device *dev = cookie; | |
379 | ||
380 | if (dev->driver->vgaarb_irq) { | |
381 | dev->driver->vgaarb_irq(dev, state); | |
382 | return; | |
383 | } | |
384 | ||
385 | if (!dev->irq_enabled) | |
386 | return; | |
387 | ||
5037f8ac JS |
388 | if (state) { |
389 | if (dev->driver->irq_uninstall) | |
390 | dev->driver->irq_uninstall(dev); | |
391 | } else { | |
392 | if (dev->driver->irq_preinstall) | |
393 | dev->driver->irq_preinstall(dev); | |
394 | if (dev->driver->irq_postinstall) | |
395 | dev->driver->irq_postinstall(dev); | |
28d52043 DA |
396 | } |
397 | } | |
398 | ||
1da177e4 | 399 | /** |
f5752b38 DV |
400 | * drm_irq_install - install IRQ handler |
401 | * @dev: DRM device | |
402 | * @irq: IRQ number to install the handler for | |
1da177e4 | 403 | * |
0a3e67a4 | 404 | * Initializes the IRQ related data. Installs the handler, calling the driver |
f5752b38 DV |
405 | * irq_preinstall() and irq_postinstall() functions before and after the |
406 | * installation. | |
407 | * | |
408 | * This is the simplified helper interface provided for drivers with no special | |
409 | * needs. Drivers which need to install interrupt handlers for multiple | |
410 | * interrupts must instead set drm_device->irq_enabled to signal the DRM core | |
411 | * that vblank interrupts are available. | |
412 | * | |
413 | * Returns: | |
414 | * Zero on success or a negative error code on failure. | |
1da177e4 | 415 | */ |
bb0f1b5c | 416 | int drm_irq_install(struct drm_device *dev, int irq) |
1da177e4 | 417 | { |
4a1b0714 | 418 | int ret; |
b5e89ed5 | 419 | unsigned long sh_flags = 0; |
1da177e4 LT |
420 | |
421 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
422 | return -EINVAL; | |
423 | ||
7c1a38e3 | 424 | if (irq == 0) |
1da177e4 LT |
425 | return -EINVAL; |
426 | ||
1da177e4 | 427 | /* Driver must have been initialized */ |
e090c53b | 428 | if (!dev->dev_private) |
1da177e4 | 429 | return -EINVAL; |
1da177e4 | 430 | |
e090c53b | 431 | if (dev->irq_enabled) |
1da177e4 | 432 | return -EBUSY; |
4423843c | 433 | dev->irq_enabled = true; |
1da177e4 | 434 | |
7c1a38e3 | 435 | DRM_DEBUG("irq=%d\n", irq); |
1da177e4 | 436 | |
b5e89ed5 | 437 | /* Before installing handler */ |
5037f8ac JS |
438 | if (dev->driver->irq_preinstall) |
439 | dev->driver->irq_preinstall(dev); | |
1da177e4 | 440 | |
b5e89ed5 | 441 | /* Install handler */ |
1da177e4 | 442 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
935f6e3a | 443 | sh_flags = IRQF_SHARED; |
b5e89ed5 | 444 | |
7c1a38e3 | 445 | ret = request_irq(irq, dev->driver->irq_handler, |
5829d183 | 446 | sh_flags, dev->driver->name, dev); |
9bfbd5cb | 447 | |
b5e89ed5 | 448 | if (ret < 0) { |
4423843c | 449 | dev->irq_enabled = false; |
1da177e4 LT |
450 | return ret; |
451 | } | |
452 | ||
28d52043 DA |
453 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
454 | vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL); | |
455 | ||
b5e89ed5 | 456 | /* After installing handler */ |
5037f8ac JS |
457 | if (dev->driver->irq_postinstall) |
458 | ret = dev->driver->irq_postinstall(dev); | |
459 | ||
0a3e67a4 | 460 | if (ret < 0) { |
4423843c | 461 | dev->irq_enabled = false; |
e1c44acc JS |
462 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
463 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
7c1a38e3 DV |
464 | free_irq(irq, dev); |
465 | } else { | |
466 | dev->irq = irq; | |
0a3e67a4 | 467 | } |
1da177e4 | 468 | |
0a3e67a4 | 469 | return ret; |
1da177e4 | 470 | } |
0a3e67a4 | 471 | EXPORT_SYMBOL(drm_irq_install); |
1da177e4 LT |
472 | |
473 | /** | |
f5752b38 DV |
474 | * drm_irq_uninstall - uninstall the IRQ handler |
475 | * @dev: DRM device | |
476 | * | |
477 | * Calls the driver's irq_uninstall() function and unregisters the IRQ handler. | |
478 | * This should only be called by drivers which used drm_irq_install() to set up | |
479 | * their interrupt handler. Other drivers must only reset | |
480 | * drm_device->irq_enabled to false. | |
1da177e4 | 481 | * |
f5752b38 DV |
482 | * Note that for kernel modesetting drivers it is a bug if this function fails. |
483 | * The sanity checks are only to catch buggy user modesetting drivers which call | |
484 | * the same function through an ioctl. | |
1da177e4 | 485 | * |
f5752b38 DV |
486 | * Returns: |
487 | * Zero on success or a negative error code on failure. | |
1da177e4 | 488 | */ |
27641c3f | 489 | int drm_irq_uninstall(struct drm_device *dev) |
1da177e4 | 490 | { |
dc1336ff | 491 | unsigned long irqflags; |
4423843c VS |
492 | bool irq_enabled; |
493 | int i; | |
1da177e4 LT |
494 | |
495 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
496 | return -EINVAL; | |
497 | ||
1da177e4 | 498 | irq_enabled = dev->irq_enabled; |
4423843c | 499 | dev->irq_enabled = false; |
1da177e4 | 500 | |
dc1336ff | 501 | /* |
3bff93d6 DV |
502 | * Wake up any waiters so they don't hang. This is just to paper over |
503 | * isssues for UMS drivers which aren't in full control of their | |
504 | * vblank/irq handling. KMS drivers must ensure that vblanks are all | |
505 | * disabled when uninstalling the irq handler. | |
dc1336ff | 506 | */ |
bde4889a BS |
507 | if (dev->num_crtcs) { |
508 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
509 | for (i = 0; i < dev->num_crtcs; i++) { | |
8a51d5be VS |
510 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
511 | ||
3bff93d6 DV |
512 | if (!vblank->enabled) |
513 | continue; | |
514 | ||
515 | WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET)); | |
516 | ||
517 | vblank_disable_and_save(dev, i); | |
8a51d5be | 518 | wake_up(&vblank->queue); |
bde4889a BS |
519 | } |
520 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
dc1336ff | 521 | } |
dc1336ff | 522 | |
b5e89ed5 | 523 | if (!irq_enabled) |
1da177e4 LT |
524 | return -EINVAL; |
525 | ||
7c1a38e3 | 526 | DRM_DEBUG("irq=%d\n", dev->irq); |
1da177e4 | 527 | |
28d52043 DA |
528 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
529 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
530 | ||
5037f8ac JS |
531 | if (dev->driver->irq_uninstall) |
532 | dev->driver->irq_uninstall(dev); | |
1da177e4 | 533 | |
7c1a38e3 | 534 | free_irq(dev->irq, dev); |
1da177e4 LT |
535 | |
536 | return 0; | |
537 | } | |
538 | EXPORT_SYMBOL(drm_irq_uninstall); | |
539 | ||
f5752b38 | 540 | /* |
1da177e4 LT |
541 | * IRQ control ioctl. |
542 | * | |
543 | * \param inode device inode. | |
6c340eac | 544 | * \param file_priv DRM file private. |
1da177e4 LT |
545 | * \param cmd command. |
546 | * \param arg user argument, pointing to a drm_control structure. | |
547 | * \return zero on success or a negative number on failure. | |
548 | * | |
549 | * Calls irq_install() or irq_uninstall() according to \p arg. | |
550 | */ | |
c153f45f EA |
551 | int drm_control(struct drm_device *dev, void *data, |
552 | struct drm_file *file_priv) | |
1da177e4 | 553 | { |
c153f45f | 554 | struct drm_control *ctl = data; |
a319c1a4 | 555 | int ret = 0, irq; |
b5e89ed5 | 556 | |
27641c3f MK |
557 | /* if we haven't irq we fallback for compatibility reasons - |
558 | * this used to be a separate function in drm_dma.h | |
559 | */ | |
1da177e4 | 560 | |
22471cf6 DV |
561 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
562 | return 0; | |
563 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
564 | return 0; | |
565 | /* UMS was only ever support on pci devices. */ | |
566 | if (WARN_ON(!dev->pdev)) | |
567 | return -EINVAL; | |
1da177e4 | 568 | |
c153f45f | 569 | switch (ctl->func) { |
1da177e4 | 570 | case DRM_INST_HANDLER: |
a319c1a4 DV |
571 | irq = dev->pdev->irq; |
572 | ||
1da177e4 | 573 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
a319c1a4 | 574 | ctl->irq != irq) |
1da177e4 | 575 | return -EINVAL; |
e090c53b | 576 | mutex_lock(&dev->struct_mutex); |
bb0f1b5c | 577 | ret = drm_irq_install(dev, irq); |
e090c53b DV |
578 | mutex_unlock(&dev->struct_mutex); |
579 | ||
580 | return ret; | |
1da177e4 | 581 | case DRM_UNINST_HANDLER: |
e090c53b DV |
582 | mutex_lock(&dev->struct_mutex); |
583 | ret = drm_irq_uninstall(dev); | |
584 | mutex_unlock(&dev->struct_mutex); | |
585 | ||
586 | return ret; | |
1da177e4 LT |
587 | default: |
588 | return -EINVAL; | |
589 | } | |
590 | } | |
591 | ||
27641c3f | 592 | /** |
f5752b38 DV |
593 | * drm_calc_timestamping_constants - calculate vblank timestamp constants |
594 | * @crtc: drm_crtc whose timestamp constants should be updated. | |
595 | * @mode: display mode containing the scanout timings | |
27641c3f | 596 | * |
21b21560 VS |
597 | * Calculate and store various constants which are later |
598 | * needed by vblank and swap-completion timestamping, e.g, | |
599 | * by drm_calc_vbltimestamp_from_scanoutpos(). They are | |
f5752b38 | 600 | * derived from CRTC's true scanout timing, so they take |
21b21560 | 601 | * things like panel scaling or other adjustments into account. |
27641c3f | 602 | */ |
545cdd55 VS |
603 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, |
604 | const struct drm_display_mode *mode) | |
27641c3f | 605 | { |
eba1f35d | 606 | struct drm_vblank_crtc *vblank = &crtc->dev->vblank[drm_crtc_index(crtc)]; |
20b20203 | 607 | int linedur_ns = 0, framedur_ns = 0; |
77666b72 | 608 | int dotclock = mode->crtc_clock; |
27641c3f MK |
609 | |
610 | /* Valid dotclock? */ | |
611 | if (dotclock > 0) { | |
0dae35a3 VS |
612 | int frame_size = mode->crtc_htotal * mode->crtc_vtotal; |
613 | ||
614 | /* | |
615 | * Convert scanline length in pixels and video | |
20b20203 VS |
616 | * dot clock to line duration and frame duration |
617 | * in nanoseconds: | |
27641c3f | 618 | */ |
0dae35a3 VS |
619 | linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock); |
620 | framedur_ns = div_u64((u64) frame_size * 1000000, dotclock); | |
c0ae24c1 VS |
621 | |
622 | /* | |
623 | * Fields of interlaced scanout modes are only half a frame duration. | |
624 | */ | |
625 | if (mode->flags & DRM_MODE_FLAG_INTERLACE) | |
626 | framedur_ns /= 2; | |
27641c3f | 627 | } else |
cc1ef118 | 628 | DRM_ERROR("crtc %u: Can't calculate constants, dotclock = 0!\n", |
27641c3f MK |
629 | crtc->base.id); |
630 | ||
eba1f35d VS |
631 | vblank->linedur_ns = linedur_ns; |
632 | vblank->framedur_ns = framedur_ns; | |
27641c3f | 633 | |
cc1ef118 | 634 | DRM_DEBUG("crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n", |
545cdd55 VS |
635 | crtc->base.id, mode->crtc_htotal, |
636 | mode->crtc_vtotal, mode->crtc_vdisplay); | |
20b20203 VS |
637 | DRM_DEBUG("crtc %u: clock %d kHz framedur %d linedur %d\n", |
638 | crtc->base.id, dotclock, framedur_ns, linedur_ns); | |
27641c3f MK |
639 | } |
640 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
641 | ||
642 | /** | |
f5752b38 DV |
643 | * drm_calc_vbltimestamp_from_scanoutpos - precise vblank timestamp helper |
644 | * @dev: DRM device | |
cc1ef118 | 645 | * @pipe: index of CRTC whose vblank timestamp to retrieve |
f5752b38 DV |
646 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) |
647 | * On return contains true maximum error of timestamp | |
648 | * @vblank_time: Pointer to struct timeval which should receive the timestamp | |
649 | * @flags: Flags to pass to driver: | |
650 | * 0 = Default, | |
651 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
f5752b38 DV |
652 | * @mode: mode which defines the scanout timings |
653 | * | |
654 | * Implements calculation of exact vblank timestamps from given drm_display_mode | |
655 | * timings and current video scanout position of a CRTC. This can be called from | |
656 | * within get_vblank_timestamp() implementation of a kms driver to implement the | |
657 | * actual timestamping. | |
27641c3f MK |
658 | * |
659 | * Should return timestamps conforming to the OML_sync_control OpenML | |
660 | * extension specification. The timestamp corresponds to the end of | |
661 | * the vblank interval, aka start of scanout of topmost-leftmost display | |
662 | * pixel in the following video frame. | |
663 | * | |
664 | * Requires support for optional dev->driver->get_scanout_position() | |
665 | * in kms driver, plus a bit of setup code to provide a drm_display_mode | |
666 | * that corresponds to the true scanout timing. | |
667 | * | |
668 | * The current implementation only handles standard video modes. It | |
669 | * returns as no operation if a doublescan or interlaced video mode is | |
670 | * active. Higher level code is expected to handle this. | |
671 | * | |
f5752b38 DV |
672 | * Returns: |
673 | * Negative value on error, failure or if not supported in current | |
27641c3f MK |
674 | * video mode: |
675 | * | |
f5752b38 | 676 | * -EINVAL - Invalid CRTC. |
27641c3f MK |
677 | * -EAGAIN - Temporary unavailable, e.g., called before initial modeset. |
678 | * -ENOTSUPP - Function not supported in current display mode. | |
679 | * -EIO - Failed, e.g., due to failed scanout position query. | |
680 | * | |
681 | * Returns or'ed positive status flags on success: | |
682 | * | |
683 | * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping. | |
684 | * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval. | |
685 | * | |
686 | */ | |
cc1ef118 TR |
687 | int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, |
688 | unsigned int pipe, | |
27641c3f MK |
689 | int *max_error, |
690 | struct timeval *vblank_time, | |
691 | unsigned flags, | |
7da903ef | 692 | const struct drm_display_mode *mode) |
27641c3f | 693 | { |
e62f2f5a | 694 | struct timeval tv_etime; |
d2cb58c8 | 695 | ktime_t stime, etime; |
8072bfa6 | 696 | int vbl_status; |
27641c3f | 697 | int vpos, hpos, i; |
3bb403bf | 698 | int delta_ns, duration_ns; |
27641c3f MK |
699 | bool invbl; |
700 | ||
cc1ef118 TR |
701 | if (pipe >= dev->num_crtcs) { |
702 | DRM_ERROR("Invalid crtc %u\n", pipe); | |
27641c3f MK |
703 | return -EINVAL; |
704 | } | |
705 | ||
706 | /* Scanout position query not supported? Should not happen. */ | |
707 | if (!dev->driver->get_scanout_position) { | |
708 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); | |
709 | return -EIO; | |
710 | } | |
711 | ||
27641c3f MK |
712 | /* If mode timing undefined, just return as no-op: |
713 | * Happens during initial modesetting of a crtc. | |
714 | */ | |
3bb403bf | 715 | if (mode->crtc_clock == 0) { |
cc1ef118 | 716 | DRM_DEBUG("crtc %u: Noop due to uninitialized mode.\n", pipe); |
27641c3f MK |
717 | return -EAGAIN; |
718 | } | |
719 | ||
27641c3f MK |
720 | /* Get current scanout position with system timestamp. |
721 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
722 | * if single query takes longer than max_error nanoseconds. | |
723 | * | |
724 | * This guarantees a tight bound on maximum error if | |
725 | * code gets preempted or delayed for some reason. | |
726 | */ | |
727 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
8f6fce03 MK |
728 | /* |
729 | * Get vertical and horizontal scanout position vpos, hpos, | |
730 | * and bounding timestamps stime, etime, pre/post query. | |
731 | */ | |
3bb403bf VS |
732 | vbl_status = dev->driver->get_scanout_position(dev, pipe, flags, |
733 | &vpos, &hpos, | |
734 | &stime, &etime, | |
735 | mode); | |
27641c3f | 736 | |
27641c3f MK |
737 | /* Return as no-op if scanout query unsupported or failed. */ |
738 | if (!(vbl_status & DRM_SCANOUTPOS_VALID)) { | |
cc1ef118 TR |
739 | DRM_DEBUG("crtc %u : scanoutpos query failed [%d].\n", |
740 | pipe, vbl_status); | |
27641c3f MK |
741 | return -EIO; |
742 | } | |
743 | ||
8f6fce03 | 744 | /* Compute uncertainty in timestamp of scanout position query. */ |
e62f2f5a | 745 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); |
27641c3f MK |
746 | |
747 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
3c184f69 | 748 | if (duration_ns <= *max_error) |
27641c3f MK |
749 | break; |
750 | } | |
751 | ||
752 | /* Noisy system timing? */ | |
753 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
cc1ef118 TR |
754 | DRM_DEBUG("crtc %u: Noisy timestamp %d us > %d us [%d reps].\n", |
755 | pipe, duration_ns/1000, *max_error/1000, i); | |
27641c3f MK |
756 | } |
757 | ||
758 | /* Return upper bound of timestamp precision error. */ | |
3c184f69 | 759 | *max_error = duration_ns; |
27641c3f MK |
760 | |
761 | /* Check if in vblank area: | |
762 | * vpos is >=0 in video scanout area, but negative | |
763 | * within vblank area, counting down the number of lines until | |
764 | * start of scanout. | |
765 | */ | |
3d3cbd84 | 766 | invbl = vbl_status & DRM_SCANOUTPOS_IN_VBLANK; |
27641c3f MK |
767 | |
768 | /* Convert scanout position into elapsed time at raw_time query | |
769 | * since start of scanout at first display scanline. delta_ns | |
770 | * can be negative if start of scanout hasn't happened yet. | |
771 | */ | |
3bb403bf VS |
772 | delta_ns = div_s64(1000000LL * (vpos * mode->crtc_htotal + hpos), |
773 | mode->crtc_clock); | |
27641c3f | 774 | |
c61eef72 | 775 | if (!drm_timestamp_monotonic) |
d2cb58c8 | 776 | etime = ktime_mono_to_real(etime); |
c61eef72 | 777 | |
e62f2f5a ID |
778 | /* save this only for debugging purposes */ |
779 | tv_etime = ktime_to_timeval(etime); | |
27641c3f MK |
780 | /* Subtract time delta from raw timestamp to get final |
781 | * vblank_time timestamp for end of vblank. | |
782 | */ | |
e91abf80 MD |
783 | if (delta_ns < 0) |
784 | etime = ktime_add_ns(etime, -delta_ns); | |
785 | else | |
786 | etime = ktime_sub_ns(etime, delta_ns); | |
e62f2f5a | 787 | *vblank_time = ktime_to_timeval(etime); |
27641c3f | 788 | |
cc1ef118 TR |
789 | DRM_DEBUG("crtc %u : v %d p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n", |
790 | pipe, (int)vbl_status, hpos, vpos, | |
e62f2f5a | 791 | (long)tv_etime.tv_sec, (long)tv_etime.tv_usec, |
bbb0aef5 | 792 | (long)vblank_time->tv_sec, (long)vblank_time->tv_usec, |
3c184f69 | 793 | duration_ns/1000, i); |
27641c3f MK |
794 | |
795 | vbl_status = DRM_VBLANKTIME_SCANOUTPOS_METHOD; | |
796 | if (invbl) | |
3d3cbd84 | 797 | vbl_status |= DRM_VBLANKTIME_IN_VBLANK; |
27641c3f MK |
798 | |
799 | return vbl_status; | |
800 | } | |
801 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); | |
802 | ||
c61eef72 ID |
803 | static struct timeval get_drm_timestamp(void) |
804 | { | |
805 | ktime_t now; | |
806 | ||
d2cb58c8 | 807 | now = drm_timestamp_monotonic ? ktime_get() : ktime_get_real(); |
c61eef72 ID |
808 | return ktime_to_timeval(now); |
809 | } | |
810 | ||
27641c3f MK |
811 | /** |
812 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
4dfd909f | 813 | * vblank interval |
27641c3f | 814 | * @dev: DRM device |
cc1ef118 | 815 | * @pipe: index of CRTC whose vblank timestamp to retrieve |
27641c3f MK |
816 | * @tvblank: Pointer to target struct timeval which should receive the timestamp |
817 | * @flags: Flags to pass to driver: | |
f5752b38 DV |
818 | * 0 = Default, |
819 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
27641c3f MK |
820 | * |
821 | * Fetches the system timestamp corresponding to the time of the most recent | |
f5752b38 | 822 | * vblank interval on specified CRTC. May call into kms-driver to |
27641c3f MK |
823 | * compute the timestamp with a high-precision GPU specific method. |
824 | * | |
825 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
826 | * call, i.e., it isn't very precisely locked to the true vblank. | |
827 | * | |
f5752b38 | 828 | * Returns: |
fb446a1a | 829 | * True if timestamp is considered to be very precise, false otherwise. |
27641c3f | 830 | */ |
fb446a1a | 831 | static bool |
cc1ef118 | 832 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, |
fb446a1a | 833 | struct timeval *tvblank, unsigned flags) |
27641c3f | 834 | { |
4a1b0714 | 835 | int ret; |
27641c3f MK |
836 | |
837 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
838 | int max_error = (int) drm_timestamp_precision * 1000; | |
839 | ||
840 | /* Query driver if possible and precision timestamping enabled. */ | |
841 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) { | |
cc1ef118 | 842 | ret = dev->driver->get_vblank_timestamp(dev, pipe, &max_error, |
27641c3f MK |
843 | tvblank, flags); |
844 | if (ret > 0) | |
fb446a1a | 845 | return true; |
27641c3f MK |
846 | } |
847 | ||
848 | /* GPU high precision timestamp query unsupported or failed. | |
c61eef72 | 849 | * Return current monotonic/gettimeofday timestamp as best estimate. |
27641c3f | 850 | */ |
c61eef72 | 851 | *tvblank = get_drm_timestamp(); |
27641c3f | 852 | |
fb446a1a | 853 | return false; |
27641c3f | 854 | } |
27641c3f | 855 | |
0a3e67a4 JB |
856 | /** |
857 | * drm_vblank_count - retrieve "cooked" vblank counter value | |
858 | * @dev: DRM device | |
cc1ef118 | 859 | * @pipe: index of CRTC for which to retrieve the counter |
0a3e67a4 JB |
860 | * |
861 | * Fetches the "cooked" vblank count value that represents the number of | |
862 | * vblank events since the system was booted, including lost events due to | |
863 | * modesetting activity. | |
f5752b38 | 864 | * |
96d3f91e TR |
865 | * This is the legacy version of drm_crtc_vblank_count(). |
866 | * | |
f5752b38 DV |
867 | * Returns: |
868 | * The software vblank counter. | |
0a3e67a4 | 869 | */ |
cc1ef118 | 870 | u32 drm_vblank_count(struct drm_device *dev, int pipe) |
0a3e67a4 | 871 | { |
cc1ef118 | 872 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
8a51d5be | 873 | |
cc1ef118 | 874 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 | 875 | return 0; |
7d1de851 | 876 | |
99264a61 | 877 | return vblank->count; |
0a3e67a4 JB |
878 | } |
879 | EXPORT_SYMBOL(drm_vblank_count); | |
880 | ||
96d3f91e TR |
881 | /** |
882 | * drm_crtc_vblank_count - retrieve "cooked" vblank counter value | |
883 | * @crtc: which counter to retrieve | |
884 | * | |
885 | * Fetches the "cooked" vblank count value that represents the number of | |
886 | * vblank events since the system was booted, including lost events due to | |
887 | * modesetting activity. | |
888 | * | |
889 | * This is the native KMS version of drm_vblank_count(). | |
890 | * | |
891 | * Returns: | |
892 | * The software vblank counter. | |
893 | */ | |
894 | u32 drm_crtc_vblank_count(struct drm_crtc *crtc) | |
895 | { | |
896 | return drm_vblank_count(crtc->dev, drm_crtc_index(crtc)); | |
897 | } | |
898 | EXPORT_SYMBOL(drm_crtc_vblank_count); | |
899 | ||
27641c3f | 900 | /** |
cc1ef118 TR |
901 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value and the |
902 | * system timestamp corresponding to that vblank counter value. | |
27641c3f | 903 | * @dev: DRM device |
cc1ef118 | 904 | * @pipe: index of CRTC whose counter to retrieve |
27641c3f MK |
905 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. |
906 | * | |
907 | * Fetches the "cooked" vblank count value that represents the number of | |
908 | * vblank events since the system was booted, including lost events due to | |
909 | * modesetting activity. Returns corresponding system timestamp of the time | |
f5752b38 | 910 | * of the vblank interval that corresponds to the current vblank counter value. |
27641c3f | 911 | */ |
cc1ef118 | 912 | u32 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe, |
27641c3f MK |
913 | struct timeval *vblanktime) |
914 | { | |
cc1ef118 | 915 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
27641c3f MK |
916 | u32 cur_vblank; |
917 | ||
cc1ef118 | 918 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
919 | return 0; |
920 | ||
99264a61 DV |
921 | /* |
922 | * Vblank timestamps are read lockless. To ensure consistency the vblank | |
923 | * counter is rechecked and ordering is ensured using memory barriers. | |
924 | * This works like a seqlock. The write-side barriers are in store_vblank. | |
27641c3f MK |
925 | */ |
926 | do { | |
99264a61 DV |
927 | cur_vblank = vblank->count; |
928 | smp_rmb(); | |
cc1ef118 | 929 | *vblanktime = vblanktimestamp(dev, pipe, cur_vblank); |
27641c3f | 930 | smp_rmb(); |
99264a61 | 931 | } while (cur_vblank != vblank->count); |
27641c3f MK |
932 | |
933 | return cur_vblank; | |
934 | } | |
935 | EXPORT_SYMBOL(drm_vblank_count_and_time); | |
936 | ||
c6eefa17 RC |
937 | static void send_vblank_event(struct drm_device *dev, |
938 | struct drm_pending_vblank_event *e, | |
939 | unsigned long seq, struct timeval *now) | |
940 | { | |
941 | WARN_ON_SMP(!spin_is_locked(&dev->event_lock)); | |
942 | e->event.sequence = seq; | |
943 | e->event.tv_sec = now->tv_sec; | |
944 | e->event.tv_usec = now->tv_usec; | |
945 | ||
946 | list_add_tail(&e->base.link, | |
947 | &e->base.file_priv->event_list); | |
948 | wake_up_interruptible(&e->base.file_priv->event_wait); | |
949 | trace_drm_vblank_event_delivered(e->base.pid, e->pipe, | |
950 | e->event.sequence); | |
951 | } | |
952 | ||
953 | /** | |
954 | * drm_send_vblank_event - helper to send vblank event after pageflip | |
955 | * @dev: DRM device | |
cc1ef118 | 956 | * @pipe: CRTC index |
c6eefa17 RC |
957 | * @e: the event to send |
958 | * | |
959 | * Updates sequence # and timestamp on event, and sends it to userspace. | |
960 | * Caller must hold event lock. | |
a4d7b30d TR |
961 | * |
962 | * This is the legacy version of drm_crtc_send_vblank_event(). | |
c6eefa17 | 963 | */ |
cc1ef118 TR |
964 | void drm_send_vblank_event(struct drm_device *dev, unsigned int pipe, |
965 | struct drm_pending_vblank_event *e) | |
c6eefa17 RC |
966 | { |
967 | struct timeval now; | |
968 | unsigned int seq; | |
4dfd909f | 969 | |
2a7d3d6d | 970 | if (dev->num_crtcs > 0) { |
cc1ef118 | 971 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
c6eefa17 RC |
972 | } else { |
973 | seq = 0; | |
c61eef72 ID |
974 | |
975 | now = get_drm_timestamp(); | |
c6eefa17 | 976 | } |
cc1ef118 | 977 | e->pipe = pipe; |
c6eefa17 RC |
978 | send_vblank_event(dev, e, seq, &now); |
979 | } | |
980 | EXPORT_SYMBOL(drm_send_vblank_event); | |
981 | ||
a4d7b30d TR |
982 | /** |
983 | * drm_crtc_send_vblank_event - helper to send vblank event after pageflip | |
984 | * @crtc: the source CRTC of the vblank event | |
985 | * @e: the event to send | |
986 | * | |
987 | * Updates sequence # and timestamp on event, and sends it to userspace. | |
988 | * Caller must hold event lock. | |
989 | * | |
990 | * This is the native KMS version of drm_send_vblank_event(). | |
991 | */ | |
992 | void drm_crtc_send_vblank_event(struct drm_crtc *crtc, | |
993 | struct drm_pending_vblank_event *e) | |
994 | { | |
995 | drm_send_vblank_event(crtc->dev, drm_crtc_index(crtc), e); | |
996 | } | |
997 | EXPORT_SYMBOL(drm_crtc_send_vblank_event); | |
998 | ||
f2752282 VS |
999 | /** |
1000 | * drm_vblank_enable - enable the vblank interrupt on a CRTC | |
1001 | * @dev: DRM device | |
cc1ef118 | 1002 | * @pipe: CRTC index |
c30e11fc TR |
1003 | * |
1004 | * Returns: | |
1005 | * Zero on success or a negative error code on failure. | |
f2752282 | 1006 | */ |
cc1ef118 | 1007 | static int drm_vblank_enable(struct drm_device *dev, unsigned int pipe) |
f2752282 | 1008 | { |
cc1ef118 | 1009 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
f2752282 VS |
1010 | int ret = 0; |
1011 | ||
1012 | assert_spin_locked(&dev->vbl_lock); | |
1013 | ||
1014 | spin_lock(&dev->vblank_time_lock); | |
1015 | ||
8a51d5be | 1016 | if (!vblank->enabled) { |
1cfb80b1 DV |
1017 | /* |
1018 | * Enable vblank irqs under vblank_time_lock protection. | |
f2752282 VS |
1019 | * All vblank count & timestamp updates are held off |
1020 | * until we are done reinitializing master counter and | |
1021 | * timestamps. Filtercode in drm_handle_vblank() will | |
1022 | * prevent double-accounting of same vblank interval. | |
1023 | */ | |
cc1ef118 TR |
1024 | ret = dev->driver->enable_vblank(dev, pipe); |
1025 | DRM_DEBUG("enabling vblank on crtc %u, ret: %d\n", pipe, ret); | |
f2752282 | 1026 | if (ret) |
8a51d5be | 1027 | atomic_dec(&vblank->refcount); |
f2752282 | 1028 | else { |
8a51d5be | 1029 | vblank->enabled = true; |
cc1ef118 | 1030 | drm_update_vblank_count(dev, pipe); |
f2752282 VS |
1031 | } |
1032 | } | |
1033 | ||
1034 | spin_unlock(&dev->vblank_time_lock); | |
1035 | ||
1036 | return ret; | |
1037 | } | |
1038 | ||
0a3e67a4 JB |
1039 | /** |
1040 | * drm_vblank_get - get a reference count on vblank events | |
1041 | * @dev: DRM device | |
cc1ef118 | 1042 | * @pipe: index of CRTC to own |
0a3e67a4 JB |
1043 | * |
1044 | * Acquire a reference count on vblank events to avoid having them disabled | |
1045 | * while in use. | |
1046 | * | |
89dd6a4b DV |
1047 | * This is the legacy version of drm_crtc_vblank_get(). |
1048 | * | |
f5752b38 | 1049 | * Returns: |
c30e11fc | 1050 | * Zero on success or a negative error code on failure. |
0a3e67a4 | 1051 | */ |
cc1ef118 | 1052 | int drm_vblank_get(struct drm_device *dev, unsigned int pipe) |
0a3e67a4 | 1053 | { |
cc1ef118 | 1054 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
97cbc883 | 1055 | unsigned long irqflags; |
0a3e67a4 JB |
1056 | int ret = 0; |
1057 | ||
16e3247d GH |
1058 | if (!dev->num_crtcs) |
1059 | return -EINVAL; | |
1060 | ||
cc1ef118 | 1061 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1062 | return -EINVAL; |
1063 | ||
0a3e67a4 JB |
1064 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
1065 | /* Going from 0->1 means we have to enable interrupts again */ | |
8a51d5be | 1066 | if (atomic_add_return(1, &vblank->refcount) == 1) { |
cc1ef118 | 1067 | ret = drm_vblank_enable(dev, pipe); |
778c9026 | 1068 | } else { |
8a51d5be VS |
1069 | if (!vblank->enabled) { |
1070 | atomic_dec(&vblank->refcount); | |
778c9026 | 1071 | ret = -EINVAL; |
0a3e67a4 JB |
1072 | } |
1073 | } | |
1074 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1075 | ||
1076 | return ret; | |
1077 | } | |
1078 | EXPORT_SYMBOL(drm_vblank_get); | |
1079 | ||
89dd6a4b DV |
1080 | /** |
1081 | * drm_crtc_vblank_get - get a reference count on vblank events | |
1082 | * @crtc: which CRTC to own | |
1083 | * | |
1084 | * Acquire a reference count on vblank events to avoid having them disabled | |
1085 | * while in use. | |
1086 | * | |
30b79f06 | 1087 | * This is the native kms version of drm_vblank_get(). |
89dd6a4b DV |
1088 | * |
1089 | * Returns: | |
c30e11fc | 1090 | * Zero on success or a negative error code on failure. |
89dd6a4b DV |
1091 | */ |
1092 | int drm_crtc_vblank_get(struct drm_crtc *crtc) | |
1093 | { | |
1094 | return drm_vblank_get(crtc->dev, drm_crtc_index(crtc)); | |
1095 | } | |
1096 | EXPORT_SYMBOL(drm_crtc_vblank_get); | |
1097 | ||
0a3e67a4 | 1098 | /** |
cc1ef118 | 1099 | * drm_vblank_put - release ownership of vblank events |
0a3e67a4 | 1100 | * @dev: DRM device |
cc1ef118 | 1101 | * @pipe: index of CRTC to release |
0a3e67a4 JB |
1102 | * |
1103 | * Release ownership of a given vblank counter, turning off interrupts | |
27641c3f | 1104 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. |
89dd6a4b DV |
1105 | * |
1106 | * This is the legacy version of drm_crtc_vblank_put(). | |
0a3e67a4 | 1107 | */ |
cc1ef118 | 1108 | void drm_vblank_put(struct drm_device *dev, unsigned int pipe) |
0a3e67a4 | 1109 | { |
cc1ef118 | 1110 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
8a51d5be | 1111 | |
cc1ef118 | 1112 | if (WARN_ON(pipe >= dev->num_crtcs)) |
7f907bf2 | 1113 | return; |
b3f5e732 | 1114 | |
7d1de851 | 1115 | if (WARN_ON(atomic_read(&vblank->refcount) == 0)) |
e6ae8687 RC |
1116 | return; |
1117 | ||
0a3e67a4 | 1118 | /* Last user schedules interrupt disable */ |
4ed0ce3d | 1119 | if (atomic_dec_and_test(&vblank->refcount)) { |
ab8905f1 DV |
1120 | if (drm_vblank_offdelay == 0) |
1121 | return; | |
1122 | else if (dev->vblank_disable_immediate || drm_vblank_offdelay < 0) | |
4ed0ce3d | 1123 | vblank_disable_fn((unsigned long)vblank); |
ab8905f1 | 1124 | else |
4ed0ce3d VS |
1125 | mod_timer(&vblank->disable_timer, |
1126 | jiffies + ((drm_vblank_offdelay * HZ)/1000)); | |
1127 | } | |
0a3e67a4 JB |
1128 | } |
1129 | EXPORT_SYMBOL(drm_vblank_put); | |
1130 | ||
89dd6a4b DV |
1131 | /** |
1132 | * drm_crtc_vblank_put - give up ownership of vblank events | |
1133 | * @crtc: which counter to give up | |
1134 | * | |
1135 | * Release ownership of a given vblank counter, turning off interrupts | |
1136 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. | |
1137 | * | |
1138 | * This is the native kms version of drm_vblank_put(). | |
1139 | */ | |
1140 | void drm_crtc_vblank_put(struct drm_crtc *crtc) | |
1141 | { | |
1142 | drm_vblank_put(crtc->dev, drm_crtc_index(crtc)); | |
1143 | } | |
1144 | EXPORT_SYMBOL(drm_crtc_vblank_put); | |
1145 | ||
e8450f51 DV |
1146 | /** |
1147 | * drm_wait_one_vblank - wait for one vblank | |
1148 | * @dev: DRM device | |
cc1ef118 | 1149 | * @pipe: CRTC index |
e8450f51 | 1150 | * |
1da248a5 VS |
1151 | * This waits for one vblank to pass on @pipe, using the irq driver interfaces. |
1152 | * It is a failure to call this when the vblank irq for @pipe is disabled, e.g. | |
e8450f51 DV |
1153 | * due to lack of driver support or because the crtc is off. |
1154 | */ | |
cc1ef118 | 1155 | void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe) |
e8450f51 | 1156 | { |
cc1ef118 | 1157 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
e8450f51 DV |
1158 | int ret; |
1159 | u32 last; | |
1160 | ||
cc1ef118 | 1161 | if (WARN_ON(pipe >= dev->num_crtcs)) |
7d1de851 TR |
1162 | return; |
1163 | ||
cc1ef118 TR |
1164 | ret = drm_vblank_get(dev, pipe); |
1165 | if (WARN(ret, "vblank not available on crtc %i, ret=%i\n", pipe, ret)) | |
e8450f51 DV |
1166 | return; |
1167 | ||
cc1ef118 | 1168 | last = drm_vblank_count(dev, pipe); |
e8450f51 | 1169 | |
cc1ef118 TR |
1170 | ret = wait_event_timeout(vblank->queue, |
1171 | last != drm_vblank_count(dev, pipe), | |
e8450f51 DV |
1172 | msecs_to_jiffies(100)); |
1173 | ||
cc1ef118 | 1174 | WARN(ret == 0, "vblank wait timed out on crtc %i\n", pipe); |
e8450f51 | 1175 | |
cc1ef118 | 1176 | drm_vblank_put(dev, pipe); |
e8450f51 DV |
1177 | } |
1178 | EXPORT_SYMBOL(drm_wait_one_vblank); | |
1179 | ||
1180 | /** | |
1181 | * drm_crtc_wait_one_vblank - wait for one vblank | |
1182 | * @crtc: DRM crtc | |
1183 | * | |
1184 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. | |
1185 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. | |
1186 | * due to lack of driver support or because the crtc is off. | |
1187 | */ | |
1188 | void drm_crtc_wait_one_vblank(struct drm_crtc *crtc) | |
1189 | { | |
1190 | drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1191 | } | |
1192 | EXPORT_SYMBOL(drm_crtc_wait_one_vblank); | |
1193 | ||
c6eefa17 RC |
1194 | /** |
1195 | * drm_vblank_off - disable vblank events on a CRTC | |
1196 | * @dev: DRM device | |
cc1ef118 | 1197 | * @pipe: CRTC index |
c6eefa17 | 1198 | * |
f5752b38 DV |
1199 | * Drivers can use this function to shut down the vblank interrupt handling when |
1200 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1201 | * stored so that drm_vblank_on() can restore it again. | |
1202 | * | |
1203 | * Drivers must use this function when the hardware vblank counter can get | |
1204 | * reset, e.g. when suspending. | |
89dd6a4b DV |
1205 | * |
1206 | * This is the legacy version of drm_crtc_vblank_off(). | |
c6eefa17 | 1207 | */ |
cc1ef118 | 1208 | void drm_vblank_off(struct drm_device *dev, unsigned int pipe) |
778c9026 | 1209 | { |
cc1ef118 | 1210 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
498548ec CJHR |
1211 | struct drm_pending_vblank_event *e, *t; |
1212 | struct timeval now; | |
778c9026 | 1213 | unsigned long irqflags; |
498548ec | 1214 | unsigned int seq; |
778c9026 | 1215 | |
cc1ef118 | 1216 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1217 | return; |
1218 | ||
56cc279b VS |
1219 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1220 | ||
1221 | spin_lock(&dev->vbl_lock); | |
cc1ef118 | 1222 | vblank_disable_and_save(dev, pipe); |
8a51d5be | 1223 | wake_up(&vblank->queue); |
498548ec | 1224 | |
56cc279b VS |
1225 | /* |
1226 | * Prevent subsequent drm_vblank_get() from re-enabling | |
1227 | * the vblank interrupt by bumping the refcount. | |
1228 | */ | |
1229 | if (!vblank->inmodeset) { | |
1230 | atomic_inc(&vblank->refcount); | |
1231 | vblank->inmodeset = 1; | |
1232 | } | |
1233 | spin_unlock(&dev->vbl_lock); | |
1234 | ||
498548ec | 1235 | /* Send any queued vblank events, lest the natives grow disquiet */ |
cc1ef118 | 1236 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
e7783ba3 | 1237 | |
498548ec | 1238 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { |
cc1ef118 | 1239 | if (e->pipe != pipe) |
498548ec CJHR |
1240 | continue; |
1241 | DRM_DEBUG("Sending premature vblank event on disable: \ | |
1242 | wanted %d, current %d\n", | |
1243 | e->event.sequence, seq); | |
c6eefa17 | 1244 | list_del(&e->base.link); |
cc1ef118 | 1245 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1246 | send_vblank_event(dev, e, seq, &now); |
498548ec | 1247 | } |
56cc279b | 1248 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
778c9026 LP |
1249 | } |
1250 | EXPORT_SYMBOL(drm_vblank_off); | |
1251 | ||
89dd6a4b DV |
1252 | /** |
1253 | * drm_crtc_vblank_off - disable vblank events on a CRTC | |
1254 | * @crtc: CRTC in question | |
1255 | * | |
1256 | * Drivers can use this function to shut down the vblank interrupt handling when | |
1257 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1258 | * stored so that drm_vblank_on can restore it again. | |
1259 | * | |
1260 | * Drivers must use this function when the hardware vblank counter can get | |
1261 | * reset, e.g. when suspending. | |
1262 | * | |
1263 | * This is the native kms version of drm_vblank_off(). | |
1264 | */ | |
1265 | void drm_crtc_vblank_off(struct drm_crtc *crtc) | |
1266 | { | |
1267 | drm_vblank_off(crtc->dev, drm_crtc_index(crtc)); | |
1268 | } | |
1269 | EXPORT_SYMBOL(drm_crtc_vblank_off); | |
1270 | ||
9625604c DV |
1271 | /** |
1272 | * drm_crtc_vblank_reset - reset vblank state to off on a CRTC | |
ec081cb3 | 1273 | * @drm_crtc: CRTC in question |
9625604c DV |
1274 | * |
1275 | * Drivers can use this function to reset the vblank state to off at load time. | |
1276 | * Drivers should use this together with the drm_crtc_vblank_off() and | |
1277 | * drm_crtc_vblank_on() functions. The difference compared to | |
1278 | * drm_crtc_vblank_off() is that this function doesn't save the vblank counter | |
1279 | * and hence doesn't need to call any driver hooks. | |
1280 | */ | |
1281 | void drm_crtc_vblank_reset(struct drm_crtc *drm_crtc) | |
1282 | { | |
1283 | struct drm_device *dev = drm_crtc->dev; | |
1284 | unsigned long irqflags; | |
1da248a5 VS |
1285 | unsigned int pipe = drm_crtc_index(drm_crtc); |
1286 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
9625604c DV |
1287 | |
1288 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1289 | /* | |
1290 | * Prevent subsequent drm_vblank_get() from enabling the vblank | |
1291 | * interrupt by bumping the refcount. | |
1292 | */ | |
1293 | if (!vblank->inmodeset) { | |
1294 | atomic_inc(&vblank->refcount); | |
1295 | vblank->inmodeset = 1; | |
1296 | } | |
1297 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1298 | ||
1299 | WARN_ON(!list_empty(&dev->vblank_event_list)); | |
1300 | } | |
1301 | EXPORT_SYMBOL(drm_crtc_vblank_reset); | |
1302 | ||
f2752282 VS |
1303 | /** |
1304 | * drm_vblank_on - enable vblank events on a CRTC | |
1305 | * @dev: DRM device | |
cc1ef118 | 1306 | * @pipe: CRTC index |
f5752b38 DV |
1307 | * |
1308 | * This functions restores the vblank interrupt state captured with | |
1309 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
32197aab | 1310 | * drm_vblank_off() can be unbalanced and so can also be unconditionally called |
f5752b38 | 1311 | * in driver load code to reflect the current hardware state of the crtc. |
89dd6a4b DV |
1312 | * |
1313 | * This is the legacy version of drm_crtc_vblank_on(). | |
f2752282 | 1314 | */ |
cc1ef118 | 1315 | void drm_vblank_on(struct drm_device *dev, unsigned int pipe) |
f2752282 | 1316 | { |
cc1ef118 | 1317 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
f2752282 VS |
1318 | unsigned long irqflags; |
1319 | ||
cc1ef118 | 1320 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1321 | return; |
1322 | ||
f2752282 | 1323 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
7ffd7a68 | 1324 | /* Drop our private "prevent drm_vblank_get" refcount */ |
8a51d5be VS |
1325 | if (vblank->inmodeset) { |
1326 | atomic_dec(&vblank->refcount); | |
1327 | vblank->inmodeset = 0; | |
7ffd7a68 | 1328 | } |
f8ad028c VS |
1329 | |
1330 | /* | |
1331 | * sample the current counter to avoid random jumps | |
1332 | * when drm_vblank_enable() applies the diff | |
1333 | * | |
1334 | * -1 to make sure user will never see the same | |
1335 | * vblank counter value before and after a modeset | |
1336 | */ | |
8a51d5be | 1337 | vblank->last = |
cc1ef118 | 1338 | (dev->driver->get_vblank_counter(dev, pipe) - 1) & |
f8ad028c | 1339 | dev->max_vblank_count; |
cd19e52a VS |
1340 | /* |
1341 | * re-enable interrupts if there are users left, or the | |
1342 | * user wishes vblank interrupts to be enabled all the time. | |
1343 | */ | |
1344 | if (atomic_read(&vblank->refcount) != 0 || | |
1345 | (!dev->vblank_disable_immediate && drm_vblank_offdelay == 0)) | |
cc1ef118 | 1346 | WARN_ON(drm_vblank_enable(dev, pipe)); |
f2752282 VS |
1347 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
1348 | } | |
1349 | EXPORT_SYMBOL(drm_vblank_on); | |
1350 | ||
89dd6a4b DV |
1351 | /** |
1352 | * drm_crtc_vblank_on - enable vblank events on a CRTC | |
1353 | * @crtc: CRTC in question | |
1354 | * | |
1355 | * This functions restores the vblank interrupt state captured with | |
1356 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
32197aab | 1357 | * drm_vblank_off() can be unbalanced and so can also be unconditionally called |
89dd6a4b DV |
1358 | * in driver load code to reflect the current hardware state of the crtc. |
1359 | * | |
1360 | * This is the native kms version of drm_vblank_on(). | |
1361 | */ | |
1362 | void drm_crtc_vblank_on(struct drm_crtc *crtc) | |
1363 | { | |
1364 | drm_vblank_on(crtc->dev, drm_crtc_index(crtc)); | |
1365 | } | |
1366 | EXPORT_SYMBOL(drm_crtc_vblank_on); | |
1367 | ||
f453ba04 DA |
1368 | /** |
1369 | * drm_vblank_pre_modeset - account for vblanks across mode sets | |
1370 | * @dev: DRM device | |
cc1ef118 | 1371 | * @pipe: CRTC index |
f453ba04 DA |
1372 | * |
1373 | * Account for vblank events across mode setting events, which will likely | |
1374 | * reset the hardware frame counter. | |
f5752b38 DV |
1375 | * |
1376 | * This is done by grabbing a temporary vblank reference to ensure that the | |
1377 | * vblank interrupt keeps running across the modeset sequence. With this the | |
1378 | * software-side vblank frame counting will ensure that there are no jumps or | |
1379 | * discontinuities. | |
1380 | * | |
1381 | * Unfortunately this approach is racy and also doesn't work when the vblank | |
1382 | * interrupt stops running, e.g. across system suspend resume. It is therefore | |
1383 | * highly recommended that drivers use the newer drm_vblank_off() and | |
1384 | * drm_vblank_on() instead. drm_vblank_pre_modeset() only works correctly when | |
1385 | * using "cooked" software vblank frame counters and not relying on any hardware | |
1386 | * counters. | |
1387 | * | |
1388 | * Drivers must call drm_vblank_post_modeset() when re-enabling the same crtc | |
1389 | * again. | |
f453ba04 | 1390 | */ |
cc1ef118 | 1391 | void drm_vblank_pre_modeset(struct drm_device *dev, unsigned int pipe) |
f453ba04 | 1392 | { |
cc1ef118 | 1393 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
8a51d5be | 1394 | |
b7ea85a4 | 1395 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
e77cef9c JG |
1396 | if (!dev->num_crtcs) |
1397 | return; | |
e6ae8687 | 1398 | |
cc1ef118 | 1399 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1400 | return; |
1401 | ||
f453ba04 DA |
1402 | /* |
1403 | * To avoid all the problems that might happen if interrupts | |
1404 | * were enabled/disabled around or between these calls, we just | |
1405 | * have the kernel take a reference on the CRTC (just once though | |
1406 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
1407 | * so that interrupts remain enabled in the interim. | |
1408 | */ | |
8a51d5be VS |
1409 | if (!vblank->inmodeset) { |
1410 | vblank->inmodeset = 0x1; | |
cc1ef118 | 1411 | if (drm_vblank_get(dev, pipe) == 0) |
8a51d5be | 1412 | vblank->inmodeset |= 0x2; |
f453ba04 DA |
1413 | } |
1414 | } | |
1415 | EXPORT_SYMBOL(drm_vblank_pre_modeset); | |
1416 | ||
f5752b38 DV |
1417 | /** |
1418 | * drm_vblank_post_modeset - undo drm_vblank_pre_modeset changes | |
1419 | * @dev: DRM device | |
cc1ef118 | 1420 | * @pipe: CRTC index |
f5752b38 DV |
1421 | * |
1422 | * This function again drops the temporary vblank reference acquired in | |
1423 | * drm_vblank_pre_modeset. | |
1424 | */ | |
cc1ef118 | 1425 | void drm_vblank_post_modeset(struct drm_device *dev, unsigned int pipe) |
f453ba04 | 1426 | { |
cc1ef118 | 1427 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
f453ba04 DA |
1428 | unsigned long irqflags; |
1429 | ||
b7ea85a4 HC |
1430 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
1431 | if (!dev->num_crtcs) | |
1432 | return; | |
1433 | ||
cc1ef118 | 1434 | if (WARN_ON(pipe >= dev->num_crtcs)) |
7d1de851 TR |
1435 | return; |
1436 | ||
8a51d5be | 1437 | if (vblank->inmodeset) { |
f453ba04 | 1438 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
ba0bf120 | 1439 | dev->vblank_disable_allowed = true; |
f453ba04 | 1440 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
b3f5e732 | 1441 | |
8a51d5be | 1442 | if (vblank->inmodeset & 0x2) |
cc1ef118 | 1443 | drm_vblank_put(dev, pipe); |
b3f5e732 | 1444 | |
8a51d5be | 1445 | vblank->inmodeset = 0; |
f453ba04 DA |
1446 | } |
1447 | } | |
1448 | EXPORT_SYMBOL(drm_vblank_post_modeset); | |
1449 | ||
f5752b38 | 1450 | /* |
0a3e67a4 JB |
1451 | * drm_modeset_ctl - handle vblank event counter changes across mode switch |
1452 | * @DRM_IOCTL_ARGS: standard ioctl arguments | |
1453 | * | |
1454 | * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET | |
1455 | * ioctls around modesetting so that any lost vblank events are accounted for. | |
1456 | * | |
1457 | * Generally the counter will reset across mode sets. If interrupts are | |
1458 | * enabled around this call, we don't have to do anything since the counter | |
1459 | * will have already been incremented. | |
1460 | */ | |
1461 | int drm_modeset_ctl(struct drm_device *dev, void *data, | |
1462 | struct drm_file *file_priv) | |
1463 | { | |
1464 | struct drm_modeset_ctl *modeset = data; | |
cc1ef118 | 1465 | unsigned int pipe; |
0a3e67a4 JB |
1466 | |
1467 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
1468 | if (!dev->num_crtcs) | |
4a1b0714 | 1469 | return 0; |
0a3e67a4 | 1470 | |
29935554 LP |
1471 | /* KMS drivers handle this internally */ |
1472 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
1473 | return 0; | |
1474 | ||
cc1ef118 TR |
1475 | pipe = modeset->crtc; |
1476 | if (pipe >= dev->num_crtcs) | |
4a1b0714 | 1477 | return -EINVAL; |
0a3e67a4 | 1478 | |
0a3e67a4 JB |
1479 | switch (modeset->cmd) { |
1480 | case _DRM_PRE_MODESET: | |
cc1ef118 | 1481 | drm_vblank_pre_modeset(dev, pipe); |
0a3e67a4 JB |
1482 | break; |
1483 | case _DRM_POST_MODESET: | |
cc1ef118 | 1484 | drm_vblank_post_modeset(dev, pipe); |
0a3e67a4 JB |
1485 | break; |
1486 | default: | |
4a1b0714 | 1487 | return -EINVAL; |
0a3e67a4 JB |
1488 | } |
1489 | ||
4a1b0714 | 1490 | return 0; |
0a3e67a4 JB |
1491 | } |
1492 | ||
cc1ef118 | 1493 | static int drm_queue_vblank_event(struct drm_device *dev, unsigned int pipe, |
c9a9c5e0 KH |
1494 | union drm_wait_vblank *vblwait, |
1495 | struct drm_file *file_priv) | |
1496 | { | |
ffe7c73a | 1497 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
c9a9c5e0 KH |
1498 | struct drm_pending_vblank_event *e; |
1499 | struct timeval now; | |
1500 | unsigned long flags; | |
1501 | unsigned int seq; | |
ea5d552c | 1502 | int ret; |
c9a9c5e0 | 1503 | |
f76511b9 | 1504 | e = kzalloc(sizeof(*e), GFP_KERNEL); |
ea5d552c CW |
1505 | if (e == NULL) { |
1506 | ret = -ENOMEM; | |
1507 | goto err_put; | |
1508 | } | |
c9a9c5e0 KH |
1509 | |
1510 | e->pipe = pipe; | |
b9c2c9ae | 1511 | e->base.pid = current->pid; |
c9a9c5e0 | 1512 | e->event.base.type = DRM_EVENT_VBLANK; |
f76511b9 | 1513 | e->event.base.length = sizeof(e->event); |
c9a9c5e0 KH |
1514 | e->event.user_data = vblwait->request.signal; |
1515 | e->base.event = &e->event.base; | |
1516 | e->base.file_priv = file_priv; | |
1517 | e->base.destroy = (void (*) (struct drm_pending_event *)) kfree; | |
1518 | ||
c9a9c5e0 KH |
1519 | spin_lock_irqsave(&dev->event_lock, flags); |
1520 | ||
ffe7c73a VS |
1521 | /* |
1522 | * drm_vblank_off() might have been called after we called | |
1523 | * drm_vblank_get(). drm_vblank_off() holds event_lock | |
1524 | * around the vblank disable, so no need for further locking. | |
1525 | * The reference from drm_vblank_get() protects against | |
1526 | * vblank disable from another source. | |
1527 | */ | |
1528 | if (!vblank->enabled) { | |
1529 | ret = -EINVAL; | |
1530 | goto err_unlock; | |
1531 | } | |
1532 | ||
f76511b9 | 1533 | if (file_priv->event_space < sizeof(e->event)) { |
ea5d552c CW |
1534 | ret = -EBUSY; |
1535 | goto err_unlock; | |
c9a9c5e0 KH |
1536 | } |
1537 | ||
f76511b9 | 1538 | file_priv->event_space -= sizeof(e->event); |
27641c3f MK |
1539 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1540 | ||
c9a9c5e0 KH |
1541 | if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) && |
1542 | (seq - vblwait->request.sequence) <= (1 << 23)) { | |
1543 | vblwait->request.sequence = seq + 1; | |
4a921645 | 1544 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1545 | } |
1546 | ||
cc1ef118 | 1547 | DRM_DEBUG("event on vblank count %d, current %d, crtc %u\n", |
c9a9c5e0 KH |
1548 | vblwait->request.sequence, seq, pipe); |
1549 | ||
b9c2c9ae JB |
1550 | trace_drm_vblank_event_queued(current->pid, pipe, |
1551 | vblwait->request.sequence); | |
1552 | ||
c9a9c5e0 KH |
1553 | e->event.sequence = vblwait->request.sequence; |
1554 | if ((seq - vblwait->request.sequence) <= (1 << 23)) { | |
6f331623 | 1555 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1556 | send_vblank_event(dev, e, seq, &now); |
000fa7cf | 1557 | vblwait->reply.sequence = seq; |
c9a9c5e0 | 1558 | } else { |
a6778e9e | 1559 | /* drm_handle_vblank_events will call drm_vblank_put */ |
c9a9c5e0 | 1560 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
000fa7cf | 1561 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1562 | } |
1563 | ||
1564 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1565 | ||
1566 | return 0; | |
ea5d552c CW |
1567 | |
1568 | err_unlock: | |
1569 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1570 | kfree(e); | |
1571 | err_put: | |
6f331623 | 1572 | drm_vblank_put(dev, pipe); |
ea5d552c | 1573 | return ret; |
c9a9c5e0 KH |
1574 | } |
1575 | ||
f5752b38 | 1576 | /* |
1da177e4 LT |
1577 | * Wait for VBLANK. |
1578 | * | |
1579 | * \param inode device inode. | |
6c340eac | 1580 | * \param file_priv DRM file private. |
1da177e4 LT |
1581 | * \param cmd command. |
1582 | * \param data user argument, pointing to a drm_wait_vblank structure. | |
1583 | * \return zero on success or a negative number on failure. | |
1584 | * | |
30b23634 EA |
1585 | * This function enables the vblank interrupt on the pipe requested, then |
1586 | * sleeps waiting for the requested sequence number to occur, and drops | |
f5752b38 | 1587 | * the vblank interrupt refcount afterwards. (vblank IRQ disable follows that |
30b23634 | 1588 | * after a timeout with no further vblank waits scheduled). |
1da177e4 | 1589 | */ |
0a3e67a4 JB |
1590 | int drm_wait_vblank(struct drm_device *dev, void *data, |
1591 | struct drm_file *file_priv) | |
1da177e4 | 1592 | { |
8a51d5be | 1593 | struct drm_vblank_crtc *vblank; |
c153f45f | 1594 | union drm_wait_vblank *vblwait = data; |
4a1b0714 | 1595 | int ret; |
cc1ef118 | 1596 | unsigned int flags, seq, pipe, high_pipe; |
1da177e4 | 1597 | |
4984979b DV |
1598 | if (!dev->irq_enabled) |
1599 | return -EINVAL; | |
1da177e4 | 1600 | |
30b23634 EA |
1601 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) |
1602 | return -EINVAL; | |
1603 | ||
c153f45f | 1604 | if (vblwait->request.type & |
19b01b5f IH |
1605 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1606 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
776c9443 | 1607 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", |
c153f45f | 1608 | vblwait->request.type, |
19b01b5f IH |
1609 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1610 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
776c9443 MCA |
1611 | return -EINVAL; |
1612 | } | |
1613 | ||
c153f45f | 1614 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
cc1ef118 TR |
1615 | high_pipe = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); |
1616 | if (high_pipe) | |
1617 | pipe = high_pipe >> _DRM_VBLANK_HIGH_CRTC_SHIFT; | |
19b01b5f | 1618 | else |
cc1ef118 TR |
1619 | pipe = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; |
1620 | if (pipe >= dev->num_crtcs) | |
776c9443 MCA |
1621 | return -EINVAL; |
1622 | ||
cc1ef118 | 1623 | vblank = &dev->vblank[pipe]; |
8a51d5be | 1624 | |
cc1ef118 | 1625 | ret = drm_vblank_get(dev, pipe); |
0a3e67a4 | 1626 | if (ret) { |
8d3457ec | 1627 | DRM_DEBUG("failed to acquire vblank counter, %d\n", ret); |
0a3e67a4 JB |
1628 | return ret; |
1629 | } | |
cc1ef118 | 1630 | seq = drm_vblank_count(dev, pipe); |
776c9443 | 1631 | |
c153f45f | 1632 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
1da177e4 | 1633 | case _DRM_VBLANK_RELATIVE: |
c153f45f EA |
1634 | vblwait->request.sequence += seq; |
1635 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |
1da177e4 LT |
1636 | case _DRM_VBLANK_ABSOLUTE: |
1637 | break; | |
1638 | default: | |
0a3e67a4 JB |
1639 | ret = -EINVAL; |
1640 | goto done; | |
1da177e4 LT |
1641 | } |
1642 | ||
a6778e9e IH |
1643 | if (flags & _DRM_VBLANK_EVENT) { |
1644 | /* must hold on to the vblank ref until the event fires | |
1645 | * drm_vblank_put will be called asynchronously | |
1646 | */ | |
cc1ef118 | 1647 | return drm_queue_vblank_event(dev, pipe, vblwait, file_priv); |
a6778e9e | 1648 | } |
c9a9c5e0 | 1649 | |
ab285d74 | 1650 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
c153f45f EA |
1651 | (seq - vblwait->request.sequence) <= (1<<23)) { |
1652 | vblwait->request.sequence = seq + 1; | |
ab285d74 MCA |
1653 | } |
1654 | ||
cc1ef118 TR |
1655 | DRM_DEBUG("waiting on vblank count %d, crtc %u\n", |
1656 | vblwait->request.sequence, pipe); | |
8a51d5be VS |
1657 | vblank->last_wait = vblwait->request.sequence; |
1658 | DRM_WAIT_ON(ret, vblank->queue, 3 * HZ, | |
cc1ef118 | 1659 | (((drm_vblank_count(dev, pipe) - |
30b23634 | 1660 | vblwait->request.sequence) <= (1 << 23)) || |
8a51d5be | 1661 | !vblank->enabled || |
30b23634 | 1662 | !dev->irq_enabled)); |
1da177e4 | 1663 | |
30b23634 EA |
1664 | if (ret != -EINTR) { |
1665 | struct timeval now; | |
1da177e4 | 1666 | |
cc1ef118 | 1667 | vblwait->reply.sequence = drm_vblank_count_and_time(dev, pipe, &now); |
30b23634 EA |
1668 | vblwait->reply.tval_sec = now.tv_sec; |
1669 | vblwait->reply.tval_usec = now.tv_usec; | |
27641c3f | 1670 | |
30b23634 EA |
1671 | DRM_DEBUG("returning %d to client\n", |
1672 | vblwait->reply.sequence); | |
1da177e4 | 1673 | } else { |
30b23634 | 1674 | DRM_DEBUG("vblank wait interrupted by signal\n"); |
1da177e4 LT |
1675 | } |
1676 | ||
0a3e67a4 | 1677 | done: |
cc1ef118 | 1678 | drm_vblank_put(dev, pipe); |
1da177e4 LT |
1679 | return ret; |
1680 | } | |
1681 | ||
cc1ef118 | 1682 | static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe) |
c9a9c5e0 KH |
1683 | { |
1684 | struct drm_pending_vblank_event *e, *t; | |
1685 | struct timeval now; | |
c9a9c5e0 KH |
1686 | unsigned int seq; |
1687 | ||
56cc279b | 1688 | assert_spin_locked(&dev->event_lock); |
c9a9c5e0 | 1689 | |
cc1ef118 | 1690 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
c9a9c5e0 KH |
1691 | |
1692 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
cc1ef118 | 1693 | if (e->pipe != pipe) |
c9a9c5e0 KH |
1694 | continue; |
1695 | if ((seq - e->event.sequence) > (1<<23)) | |
1696 | continue; | |
1697 | ||
1698 | DRM_DEBUG("vblank event on %d, current %d\n", | |
1699 | e->event.sequence, seq); | |
1700 | ||
c6eefa17 | 1701 | list_del(&e->base.link); |
cc1ef118 | 1702 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1703 | send_vblank_event(dev, e, seq, &now); |
c9a9c5e0 KH |
1704 | } |
1705 | ||
cc1ef118 | 1706 | trace_drm_vblank_event(pipe, seq); |
c9a9c5e0 KH |
1707 | } |
1708 | ||
0a3e67a4 JB |
1709 | /** |
1710 | * drm_handle_vblank - handle a vblank event | |
1711 | * @dev: DRM device | |
cc1ef118 | 1712 | * @pipe: index of CRTC where this event occurred |
0a3e67a4 JB |
1713 | * |
1714 | * Drivers should call this routine in their vblank interrupt handlers to | |
1715 | * update the vblank counter and send any signals that may be pending. | |
115ebcd4 TR |
1716 | * |
1717 | * This is the legacy version of drm_crtc_handle_vblank(). | |
0a3e67a4 | 1718 | */ |
cc1ef118 | 1719 | bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe) |
0a3e67a4 | 1720 | { |
cc1ef118 | 1721 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
27641c3f MK |
1722 | u32 vblcount; |
1723 | s64 diff_ns; | |
1724 | struct timeval tvblank; | |
1725 | unsigned long irqflags; | |
1726 | ||
ee3c7795 | 1727 | if (WARN_ON_ONCE(!dev->num_crtcs)) |
78c6e170 | 1728 | return false; |
c9a9c5e0 | 1729 | |
cc1ef118 | 1730 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1731 | return false; |
1732 | ||
56cc279b VS |
1733 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1734 | ||
27641c3f MK |
1735 | /* Need timestamp lock to prevent concurrent execution with |
1736 | * vblank enable/disable, as this would cause inconsistent | |
1737 | * or corrupted timestamps and vblank counts. | |
1738 | */ | |
56cc279b | 1739 | spin_lock(&dev->vblank_time_lock); |
27641c3f MK |
1740 | |
1741 | /* Vblank irq handling disabled. Nothing to do. */ | |
8a51d5be | 1742 | if (!vblank->enabled) { |
56cc279b VS |
1743 | spin_unlock(&dev->vblank_time_lock); |
1744 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
78c6e170 | 1745 | return false; |
27641c3f MK |
1746 | } |
1747 | ||
1748 | /* Fetch corresponding timestamp for this vblank interval from | |
1749 | * driver and store it in proper slot of timestamp ringbuffer. | |
1750 | */ | |
1751 | ||
1752 | /* Get current timestamp and count. */ | |
99264a61 | 1753 | vblcount = vblank->count; |
cc1ef118 | 1754 | drm_get_last_vbltimestamp(dev, pipe, &tvblank, DRM_CALLED_FROM_VBLIRQ); |
27641c3f MK |
1755 | |
1756 | /* Compute time difference to timestamp of last vblank */ | |
1757 | diff_ns = timeval_to_ns(&tvblank) - | |
cc1ef118 | 1758 | timeval_to_ns(&vblanktimestamp(dev, pipe, vblcount)); |
27641c3f MK |
1759 | |
1760 | /* Update vblank timestamp and count if at least | |
1761 | * DRM_REDUNDANT_VBLIRQ_THRESH_NS nanoseconds | |
1762 | * difference between last stored timestamp and current | |
1763 | * timestamp. A smaller difference means basically | |
1764 | * identical timestamps. Happens if this vblank has | |
1765 | * been already processed and this is a redundant call, | |
1766 | * e.g., due to spurious vblank interrupts. We need to | |
1767 | * ignore those for accounting. | |
1768 | */ | |
99264a61 | 1769 | if (abs64(diff_ns) > DRM_REDUNDANT_VBLIRQ_THRESH_NS) |
cc1ef118 | 1770 | store_vblank(dev, pipe, 1, &tvblank); |
99264a61 | 1771 | else |
cc1ef118 TR |
1772 | DRM_DEBUG("crtc %u: Redundant vblirq ignored. diff_ns = %d\n", |
1773 | pipe, (int) diff_ns); | |
27641c3f | 1774 | |
56cc279b VS |
1775 | spin_unlock(&dev->vblank_time_lock); |
1776 | ||
8a51d5be | 1777 | wake_up(&vblank->queue); |
cc1ef118 | 1778 | drm_handle_vblank_events(dev, pipe); |
27641c3f | 1779 | |
56cc279b VS |
1780 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
1781 | ||
78c6e170 | 1782 | return true; |
0a3e67a4 JB |
1783 | } |
1784 | EXPORT_SYMBOL(drm_handle_vblank); | |
115ebcd4 TR |
1785 | |
1786 | /** | |
1787 | * drm_crtc_handle_vblank - handle a vblank event | |
1788 | * @crtc: where this event occurred | |
1789 | * | |
1790 | * Drivers should call this routine in their vblank interrupt handlers to | |
1791 | * update the vblank counter and send any signals that may be pending. | |
1792 | * | |
1793 | * This is the native KMS version of drm_handle_vblank(). | |
1794 | * | |
1795 | * Returns: | |
1796 | * True if the event was successfully handled, false on failure. | |
1797 | */ | |
1798 | bool drm_crtc_handle_vblank(struct drm_crtc *crtc) | |
1799 | { | |
1800 | return drm_handle_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1801 | } | |
1802 | EXPORT_SYMBOL(drm_crtc_handle_vblank); |