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Commit | Line | Data |
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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 | 44 | |
27641c3f MK |
45 | /* Retry timestamp calculation up to 3 times to satisfy |
46 | * drm_timestamp_precision before giving up. | |
47 | */ | |
48 | #define DRM_TIMESTAMP_MAXRETRIES 3 | |
49 | ||
50 | /* Threshold in nanoseconds for detection of redundant | |
51 | * vblank irq in drm_handle_vblank(). 1 msec should be ok. | |
52 | */ | |
53 | #define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000 | |
54 | ||
fb446a1a | 55 | static bool |
cc1ef118 | 56 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, |
fb446a1a DV |
57 | struct timeval *tvblank, unsigned flags); |
58 | ||
18882995 DV |
59 | static unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */ |
60 | ||
61 | /* | |
62 | * Default to use monotonic timestamps for wait-for-vblank and page-flip | |
63 | * complete events. | |
64 | */ | |
65 | unsigned int drm_timestamp_monotonic = 1; | |
66 | ||
67 | static int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */ | |
68 | ||
69 | module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600); | |
70 | module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600); | |
71 | module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600); | |
d9d8c4cf DC |
72 | MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs] (0: never disable, <0: disable immediately)"); |
73 | MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]"); | |
74 | MODULE_PARM_DESC(timestamp_monotonic, "Use monotonic timestamps"); | |
18882995 | 75 | |
1da248a5 | 76 | static void store_vblank(struct drm_device *dev, unsigned int pipe, |
209e4dbc | 77 | u32 vblank_count_inc, |
4dfd6486 | 78 | struct timeval *t_vblank, u32 last) |
99264a61 | 79 | { |
1da248a5 | 80 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
99264a61 DV |
81 | |
82 | assert_spin_locked(&dev->vblank_time_lock); | |
83 | ||
4dfd6486 VS |
84 | vblank->last = last; |
85 | ||
d4055a9b MA |
86 | write_seqlock(&vblank->seqlock); |
87 | vblank->time = *t_vblank; | |
99264a61 | 88 | vblank->count += vblank_count_inc; |
d4055a9b | 89 | write_sequnlock(&vblank->seqlock); |
99264a61 DV |
90 | } |
91 | ||
00edbe19 | 92 | /* |
4dfd6486 VS |
93 | * Reset the stored timestamp for the current vblank count to correspond |
94 | * to the last vblank occurred. | |
95 | * | |
96 | * Only to be called from drm_vblank_on(). | |
97 | * | |
98 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
99 | * device vblank fields. | |
100 | */ | |
101 | static void drm_reset_vblank_timestamp(struct drm_device *dev, unsigned int pipe) | |
102 | { | |
103 | u32 cur_vblank; | |
104 | bool rc; | |
105 | struct timeval t_vblank; | |
106 | int count = DRM_TIMESTAMP_MAXRETRIES; | |
107 | ||
108 | spin_lock(&dev->vblank_time_lock); | |
109 | ||
110 | /* | |
111 | * sample the current counter to avoid random jumps | |
112 | * when drm_vblank_enable() applies the diff | |
113 | */ | |
114 | do { | |
115 | cur_vblank = dev->driver->get_vblank_counter(dev, pipe); | |
116 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, 0); | |
117 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, pipe) && --count > 0); | |
118 | ||
119 | /* | |
120 | * Only reinitialize corresponding vblank timestamp if high-precision query | |
121 | * available and didn't fail. Otherwise reinitialize delayed at next vblank | |
122 | * interrupt and assign 0 for now, to mark the vblanktimestamp as invalid. | |
123 | */ | |
124 | if (!rc) | |
125 | t_vblank = (struct timeval) {0, 0}; | |
126 | ||
127 | /* | |
128 | * +1 to make sure user will never see the same | |
129 | * vblank counter value before and after a modeset | |
130 | */ | |
131 | store_vblank(dev, pipe, 1, &t_vblank, cur_vblank); | |
132 | ||
133 | spin_unlock(&dev->vblank_time_lock); | |
134 | } | |
135 | ||
00edbe19 | 136 | /* |
13b030af | 137 | * Call back into the driver to update the appropriate vblank counter |
1da248a5 | 138 | * (specified by @pipe). Deal with wraparound, if it occurred, and |
13b030af VS |
139 | * update the last read value so we can deal with wraparound on the next |
140 | * call if necessary. | |
141 | * | |
142 | * Only necessary when going from off->on, to account for frames we | |
143 | * didn't get an interrupt for. | |
144 | * | |
145 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
146 | * device vblank fields. | |
147 | */ | |
a6e610dc VS |
148 | static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe, |
149 | unsigned long flags) | |
13b030af | 150 | { |
cc1ef118 | 151 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
99264a61 | 152 | u32 cur_vblank, diff; |
fb446a1a | 153 | bool rc; |
13b030af | 154 | struct timeval t_vblank; |
facfb062 | 155 | int count = DRM_TIMESTAMP_MAXRETRIES; |
4dfd6486 | 156 | int framedur_ns = vblank->framedur_ns; |
13b030af VS |
157 | |
158 | /* | |
159 | * Interrupts were disabled prior to this call, so deal with counter | |
160 | * wrap if needed. | |
5ceecb2f | 161 | * NOTE! It's possible we lost a full dev->max_vblank_count + 1 events |
13b030af VS |
162 | * here if the register is small or we had vblank interrupts off for |
163 | * a long time. | |
164 | * | |
165 | * We repeat the hardware vblank counter & timestamp query until | |
166 | * we get consistent results. This to prevent races between gpu | |
167 | * updating its hardware counter while we are retrieving the | |
168 | * corresponding vblank timestamp. | |
169 | */ | |
170 | do { | |
cc1ef118 | 171 | cur_vblank = dev->driver->get_vblank_counter(dev, pipe); |
a6e610dc | 172 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, flags); |
facfb062 | 173 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, pipe) && --count > 0); |
13b030af | 174 | |
4dfd6486 VS |
175 | if (dev->max_vblank_count != 0) { |
176 | /* trust the hw counter when it's around */ | |
177 | diff = (cur_vblank - vblank->last) & dev->max_vblank_count; | |
178 | } else if (rc && framedur_ns) { | |
179 | const struct timeval *t_old; | |
180 | u64 diff_ns; | |
181 | ||
d4055a9b | 182 | t_old = &vblank->time; |
4dfd6486 | 183 | diff_ns = timeval_to_ns(&t_vblank) - timeval_to_ns(t_old); |
13b030af | 184 | |
4dfd6486 VS |
185 | /* |
186 | * Figure out how many vblanks we've missed based | |
187 | * on the difference in the timestamps and the | |
188 | * frame/field duration. | |
189 | */ | |
190 | diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns); | |
191 | ||
192 | if (diff == 0 && flags & DRM_CALLED_FROM_VBLIRQ) | |
235fabe0 VS |
193 | DRM_DEBUG_VBL("crtc %u: Redundant vblirq ignored." |
194 | " diff_ns = %lld, framedur_ns = %d)\n", | |
195 | pipe, (long long) diff_ns, framedur_ns); | |
4dfd6486 VS |
196 | } else { |
197 | /* some kind of default for drivers w/o accurate vbl timestamping */ | |
198 | diff = (flags & DRM_CALLED_FROM_VBLIRQ) != 0; | |
13b030af VS |
199 | } |
200 | ||
c61934ed MK |
201 | /* |
202 | * Within a drm_vblank_pre_modeset - drm_vblank_post_modeset | |
203 | * interval? If so then vblank irqs keep running and it will likely | |
204 | * happen that the hardware vblank counter is not trustworthy as it | |
205 | * might reset at some point in that interval and vblank timestamps | |
206 | * are not trustworthy either in that interval. Iow. this can result | |
207 | * in a bogus diff >> 1 which must be avoided as it would cause | |
208 | * random large forward jumps of the software vblank counter. | |
209 | */ | |
210 | if (diff > 1 && (vblank->inmodeset & 0x2)) { | |
211 | DRM_DEBUG_VBL("clamping vblank bump to 1 on crtc %u: diffr=%u" | |
212 | " due to pre-modeset.\n", pipe, diff); | |
213 | diff = 1; | |
214 | } | |
215 | ||
235fabe0 VS |
216 | DRM_DEBUG_VBL("updating vblank count on crtc %u:" |
217 | " current=%u, diff=%u, hw=%u hw_last=%u\n", | |
218 | pipe, vblank->count, diff, cur_vblank, vblank->last); | |
13b030af | 219 | |
4dfd6486 VS |
220 | if (diff == 0) { |
221 | WARN_ON_ONCE(cur_vblank != vblank->last); | |
da8f4396 | 222 | return; |
4dfd6486 | 223 | } |
da8f4396 | 224 | |
99264a61 DV |
225 | /* |
226 | * Only reinitialize corresponding vblank timestamp if high-precision query | |
fa4270d8 VS |
227 | * available and didn't fail, or we were called from the vblank interrupt. |
228 | * Otherwise reinitialize delayed at next vblank interrupt and assign 0 | |
229 | * for now, to mark the vblanktimestamp as invalid. | |
13b030af | 230 | */ |
fa4270d8 | 231 | if (!rc && (flags & DRM_CALLED_FROM_VBLIRQ) == 0) |
d66a1e38 MK |
232 | t_vblank = (struct timeval) {0, 0}; |
233 | ||
4dfd6486 | 234 | store_vblank(dev, pipe, diff, &t_vblank, cur_vblank); |
13b030af VS |
235 | } |
236 | ||
d6b0f626 DV |
237 | static u32 drm_vblank_count(struct drm_device *dev, unsigned int pipe) |
238 | { | |
239 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
240 | ||
241 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
242 | return 0; | |
243 | ||
244 | return vblank->count; | |
245 | } | |
246 | ||
af61d5ce ML |
247 | /** |
248 | * drm_accurate_vblank_count - retrieve the master vblank counter | |
249 | * @crtc: which counter to retrieve | |
250 | * | |
251 | * This function is similar to @drm_crtc_vblank_count but this | |
252 | * function interpolates to handle a race with vblank irq's. | |
253 | * | |
254 | * This is mostly useful for hardware that can obtain the scanout | |
255 | * position, but doesn't have a frame counter. | |
256 | */ | |
257 | u32 drm_accurate_vblank_count(struct drm_crtc *crtc) | |
258 | { | |
259 | struct drm_device *dev = crtc->dev; | |
260 | unsigned int pipe = drm_crtc_index(crtc); | |
261 | u32 vblank; | |
262 | unsigned long flags; | |
263 | ||
264 | WARN(!dev->driver->get_vblank_timestamp, | |
265 | "This function requires support for accurate vblank timestamps."); | |
266 | ||
267 | spin_lock_irqsave(&dev->vblank_time_lock, flags); | |
268 | ||
269 | drm_update_vblank_count(dev, pipe, 0); | |
270 | vblank = drm_vblank_count(dev, pipe); | |
271 | ||
272 | spin_unlock_irqrestore(&dev->vblank_time_lock, flags); | |
273 | ||
274 | return vblank; | |
275 | } | |
276 | EXPORT_SYMBOL(drm_accurate_vblank_count); | |
277 | ||
27641c3f MK |
278 | /* |
279 | * Disable vblank irq's on crtc, make sure that last vblank count | |
280 | * of hardware and corresponding consistent software vblank counter | |
281 | * are preserved, even if there are any spurious vblank irq's after | |
282 | * disable. | |
283 | */ | |
cc1ef118 | 284 | static void vblank_disable_and_save(struct drm_device *dev, unsigned int pipe) |
27641c3f | 285 | { |
cc1ef118 | 286 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
27641c3f | 287 | unsigned long irqflags; |
27641c3f MK |
288 | |
289 | /* Prevent vblank irq processing while disabling vblank irqs, | |
290 | * so no updates of timestamps or count can happen after we've | |
291 | * disabled. Needed to prevent races in case of delayed irq's. | |
27641c3f | 292 | */ |
27641c3f MK |
293 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); |
294 | ||
eb2ed66f LP |
295 | /* |
296 | * Only disable vblank interrupts if they're enabled. This avoids | |
297 | * calling the ->disable_vblank() operation in atomic context with the | |
298 | * hardware potentially runtime suspended. | |
299 | */ | |
300 | if (vblank->enabled) { | |
cc1ef118 | 301 | dev->driver->disable_vblank(dev, pipe); |
eb2ed66f LP |
302 | vblank->enabled = false; |
303 | } | |
27641c3f | 304 | |
4dfd6486 VS |
305 | /* |
306 | * Always update the count and timestamp to maintain the | |
307 | * appearance that the counter has been ticking all along until | |
308 | * this time. This makes the count account for the entire time | |
309 | * between drm_vblank_on() and drm_vblank_off(). | |
27641c3f | 310 | */ |
4dfd6486 | 311 | drm_update_vblank_count(dev, pipe, 0); |
27641c3f | 312 | |
27641c3f | 313 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); |
27641c3f MK |
314 | } |
315 | ||
0a3e67a4 JB |
316 | static void vblank_disable_fn(unsigned long arg) |
317 | { | |
e69595c2 VS |
318 | struct drm_vblank_crtc *vblank = (void *)arg; |
319 | struct drm_device *dev = vblank->dev; | |
cc1ef118 | 320 | unsigned int pipe = vblank->pipe; |
0a3e67a4 | 321 | unsigned long irqflags; |
0a3e67a4 | 322 | |
e69595c2 VS |
323 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
324 | if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) { | |
cc1ef118 TR |
325 | DRM_DEBUG("disabling vblank on crtc %u\n", pipe); |
326 | vblank_disable_and_save(dev, pipe); | |
0a3e67a4 | 327 | } |
e69595c2 | 328 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
0a3e67a4 JB |
329 | } |
330 | ||
f5752b38 DV |
331 | /** |
332 | * drm_vblank_cleanup - cleanup vblank support | |
333 | * @dev: DRM device | |
334 | * | |
335 | * This function cleans up any resources allocated in drm_vblank_init. | |
336 | */ | |
52440211 | 337 | void drm_vblank_cleanup(struct drm_device *dev) |
0a3e67a4 | 338 | { |
cc1ef118 | 339 | unsigned int pipe; |
e69595c2 | 340 | |
0a3e67a4 JB |
341 | /* Bail if the driver didn't call drm_vblank_init() */ |
342 | if (dev->num_crtcs == 0) | |
343 | return; | |
344 | ||
cc1ef118 TR |
345 | for (pipe = 0; pipe < dev->num_crtcs; pipe++) { |
346 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
8a51d5be | 347 | |
3bff93d6 DV |
348 | WARN_ON(vblank->enabled && |
349 | drm_core_check_feature(dev, DRIVER_MODESET)); | |
2368ffb1 | 350 | |
3bff93d6 | 351 | del_timer_sync(&vblank->disable_timer); |
e69595c2 | 352 | } |
0a3e67a4 | 353 | |
5380e929 | 354 | kfree(dev->vblank); |
0a3e67a4 JB |
355 | |
356 | dev->num_crtcs = 0; | |
357 | } | |
e77cef9c | 358 | EXPORT_SYMBOL(drm_vblank_cleanup); |
0a3e67a4 | 359 | |
f5752b38 DV |
360 | /** |
361 | * drm_vblank_init - initialize vblank support | |
cc1ef118 TR |
362 | * @dev: DRM device |
363 | * @num_crtcs: number of CRTCs supported by @dev | |
f5752b38 DV |
364 | * |
365 | * This function initializes vblank support for @num_crtcs display pipelines. | |
366 | * | |
367 | * Returns: | |
368 | * Zero on success or a negative error code on failure. | |
369 | */ | |
cc1ef118 | 370 | int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs) |
0a3e67a4 | 371 | { |
cc1ef118 TR |
372 | int ret = -ENOMEM; |
373 | unsigned int i; | |
0a3e67a4 | 374 | |
0a3e67a4 | 375 | spin_lock_init(&dev->vbl_lock); |
27641c3f MK |
376 | spin_lock_init(&dev->vblank_time_lock); |
377 | ||
0a3e67a4 JB |
378 | dev->num_crtcs = num_crtcs; |
379 | ||
5380e929 VS |
380 | dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL); |
381 | if (!dev->vblank) | |
0a3e67a4 JB |
382 | goto err; |
383 | ||
e69595c2 | 384 | for (i = 0; i < num_crtcs; i++) { |
8a51d5be VS |
385 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
386 | ||
387 | vblank->dev = dev; | |
cc1ef118 | 388 | vblank->pipe = i; |
8a51d5be VS |
389 | init_waitqueue_head(&vblank->queue); |
390 | setup_timer(&vblank->disable_timer, vblank_disable_fn, | |
391 | (unsigned long)vblank); | |
d4055a9b | 392 | seqlock_init(&vblank->seqlock); |
e69595c2 | 393 | } |
27641c3f | 394 | |
8f6fce03 | 395 | DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n"); |
27641c3f MK |
396 | |
397 | /* Driver specific high-precision vblank timestamping supported? */ | |
398 | if (dev->driver->get_vblank_timestamp) | |
399 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); | |
400 | else | |
401 | DRM_INFO("No driver support for vblank timestamp query.\n"); | |
402 | ||
5a8b21b2 MK |
403 | /* Must have precise timestamping for reliable vblank instant disable */ |
404 | if (dev->vblank_disable_immediate && !dev->driver->get_vblank_timestamp) { | |
405 | dev->vblank_disable_immediate = false; | |
406 | DRM_INFO("Setting vblank_disable_immediate to false because " | |
407 | "get_vblank_timestamp == NULL\n"); | |
408 | } | |
409 | ||
0a3e67a4 JB |
410 | return 0; |
411 | ||
412 | err: | |
79a093ae | 413 | dev->num_crtcs = 0; |
0a3e67a4 JB |
414 | return ret; |
415 | } | |
416 | EXPORT_SYMBOL(drm_vblank_init); | |
417 | ||
28d52043 DA |
418 | static void drm_irq_vgaarb_nokms(void *cookie, bool state) |
419 | { | |
420 | struct drm_device *dev = cookie; | |
421 | ||
422 | if (dev->driver->vgaarb_irq) { | |
423 | dev->driver->vgaarb_irq(dev, state); | |
424 | return; | |
425 | } | |
426 | ||
427 | if (!dev->irq_enabled) | |
428 | return; | |
429 | ||
5037f8ac JS |
430 | if (state) { |
431 | if (dev->driver->irq_uninstall) | |
432 | dev->driver->irq_uninstall(dev); | |
433 | } else { | |
434 | if (dev->driver->irq_preinstall) | |
435 | dev->driver->irq_preinstall(dev); | |
436 | if (dev->driver->irq_postinstall) | |
437 | dev->driver->irq_postinstall(dev); | |
28d52043 DA |
438 | } |
439 | } | |
440 | ||
1da177e4 | 441 | /** |
f5752b38 DV |
442 | * drm_irq_install - install IRQ handler |
443 | * @dev: DRM device | |
444 | * @irq: IRQ number to install the handler for | |
1da177e4 | 445 | * |
0a3e67a4 | 446 | * Initializes the IRQ related data. Installs the handler, calling the driver |
f5752b38 DV |
447 | * irq_preinstall() and irq_postinstall() functions before and after the |
448 | * installation. | |
449 | * | |
450 | * This is the simplified helper interface provided for drivers with no special | |
451 | * needs. Drivers which need to install interrupt handlers for multiple | |
452 | * interrupts must instead set drm_device->irq_enabled to signal the DRM core | |
453 | * that vblank interrupts are available. | |
454 | * | |
455 | * Returns: | |
456 | * Zero on success or a negative error code on failure. | |
1da177e4 | 457 | */ |
bb0f1b5c | 458 | int drm_irq_install(struct drm_device *dev, int irq) |
1da177e4 | 459 | { |
4a1b0714 | 460 | int ret; |
b5e89ed5 | 461 | unsigned long sh_flags = 0; |
1da177e4 LT |
462 | |
463 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
464 | return -EINVAL; | |
465 | ||
7c1a38e3 | 466 | if (irq == 0) |
1da177e4 LT |
467 | return -EINVAL; |
468 | ||
1da177e4 | 469 | /* Driver must have been initialized */ |
e090c53b | 470 | if (!dev->dev_private) |
1da177e4 | 471 | return -EINVAL; |
1da177e4 | 472 | |
e090c53b | 473 | if (dev->irq_enabled) |
1da177e4 | 474 | return -EBUSY; |
4423843c | 475 | dev->irq_enabled = true; |
1da177e4 | 476 | |
7c1a38e3 | 477 | DRM_DEBUG("irq=%d\n", irq); |
1da177e4 | 478 | |
b5e89ed5 | 479 | /* Before installing handler */ |
5037f8ac JS |
480 | if (dev->driver->irq_preinstall) |
481 | dev->driver->irq_preinstall(dev); | |
1da177e4 | 482 | |
b5e89ed5 | 483 | /* Install handler */ |
1da177e4 | 484 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
935f6e3a | 485 | sh_flags = IRQF_SHARED; |
b5e89ed5 | 486 | |
7c1a38e3 | 487 | ret = request_irq(irq, dev->driver->irq_handler, |
5829d183 | 488 | sh_flags, dev->driver->name, dev); |
9bfbd5cb | 489 | |
b5e89ed5 | 490 | if (ret < 0) { |
4423843c | 491 | dev->irq_enabled = false; |
1da177e4 LT |
492 | return ret; |
493 | } | |
494 | ||
fa538645 | 495 | if (drm_core_check_feature(dev, DRIVER_LEGACY)) |
28d52043 DA |
496 | vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL); |
497 | ||
b5e89ed5 | 498 | /* After installing handler */ |
5037f8ac JS |
499 | if (dev->driver->irq_postinstall) |
500 | ret = dev->driver->irq_postinstall(dev); | |
501 | ||
0a3e67a4 | 502 | if (ret < 0) { |
4423843c | 503 | dev->irq_enabled = false; |
fa538645 | 504 | if (drm_core_check_feature(dev, DRIVER_LEGACY)) |
e1c44acc | 505 | vga_client_register(dev->pdev, NULL, NULL, NULL); |
7c1a38e3 DV |
506 | free_irq(irq, dev); |
507 | } else { | |
508 | dev->irq = irq; | |
0a3e67a4 | 509 | } |
1da177e4 | 510 | |
0a3e67a4 | 511 | return ret; |
1da177e4 | 512 | } |
0a3e67a4 | 513 | EXPORT_SYMBOL(drm_irq_install); |
1da177e4 LT |
514 | |
515 | /** | |
f5752b38 DV |
516 | * drm_irq_uninstall - uninstall the IRQ handler |
517 | * @dev: DRM device | |
518 | * | |
519 | * Calls the driver's irq_uninstall() function and unregisters the IRQ handler. | |
520 | * This should only be called by drivers which used drm_irq_install() to set up | |
521 | * their interrupt handler. Other drivers must only reset | |
522 | * drm_device->irq_enabled to false. | |
1da177e4 | 523 | * |
f5752b38 DV |
524 | * Note that for kernel modesetting drivers it is a bug if this function fails. |
525 | * The sanity checks are only to catch buggy user modesetting drivers which call | |
526 | * the same function through an ioctl. | |
1da177e4 | 527 | * |
f5752b38 DV |
528 | * Returns: |
529 | * Zero on success or a negative error code on failure. | |
1da177e4 | 530 | */ |
27641c3f | 531 | int drm_irq_uninstall(struct drm_device *dev) |
1da177e4 | 532 | { |
dc1336ff | 533 | unsigned long irqflags; |
4423843c VS |
534 | bool irq_enabled; |
535 | int i; | |
1da177e4 LT |
536 | |
537 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
538 | return -EINVAL; | |
539 | ||
1da177e4 | 540 | irq_enabled = dev->irq_enabled; |
4423843c | 541 | dev->irq_enabled = false; |
1da177e4 | 542 | |
dc1336ff | 543 | /* |
3bff93d6 | 544 | * Wake up any waiters so they don't hang. This is just to paper over |
c78d1ca2 | 545 | * issues for UMS drivers which aren't in full control of their |
3bff93d6 DV |
546 | * vblank/irq handling. KMS drivers must ensure that vblanks are all |
547 | * disabled when uninstalling the irq handler. | |
dc1336ff | 548 | */ |
bde4889a BS |
549 | if (dev->num_crtcs) { |
550 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
551 | for (i = 0; i < dev->num_crtcs; i++) { | |
8a51d5be VS |
552 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
553 | ||
3bff93d6 DV |
554 | if (!vblank->enabled) |
555 | continue; | |
556 | ||
557 | WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET)); | |
558 | ||
559 | vblank_disable_and_save(dev, i); | |
8a51d5be | 560 | wake_up(&vblank->queue); |
bde4889a BS |
561 | } |
562 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
dc1336ff | 563 | } |
dc1336ff | 564 | |
b5e89ed5 | 565 | if (!irq_enabled) |
1da177e4 LT |
566 | return -EINVAL; |
567 | ||
7c1a38e3 | 568 | DRM_DEBUG("irq=%d\n", dev->irq); |
1da177e4 | 569 | |
fa538645 | 570 | if (drm_core_check_feature(dev, DRIVER_LEGACY)) |
28d52043 DA |
571 | vga_client_register(dev->pdev, NULL, NULL, NULL); |
572 | ||
5037f8ac JS |
573 | if (dev->driver->irq_uninstall) |
574 | dev->driver->irq_uninstall(dev); | |
1da177e4 | 575 | |
7c1a38e3 | 576 | free_irq(dev->irq, dev); |
1da177e4 LT |
577 | |
578 | return 0; | |
579 | } | |
580 | EXPORT_SYMBOL(drm_irq_uninstall); | |
581 | ||
f5752b38 | 582 | /* |
1da177e4 LT |
583 | * IRQ control ioctl. |
584 | * | |
585 | * \param inode device inode. | |
6c340eac | 586 | * \param file_priv DRM file private. |
1da177e4 LT |
587 | * \param cmd command. |
588 | * \param arg user argument, pointing to a drm_control structure. | |
589 | * \return zero on success or a negative number on failure. | |
590 | * | |
591 | * Calls irq_install() or irq_uninstall() according to \p arg. | |
592 | */ | |
c153f45f EA |
593 | int drm_control(struct drm_device *dev, void *data, |
594 | struct drm_file *file_priv) | |
1da177e4 | 595 | { |
c153f45f | 596 | struct drm_control *ctl = data; |
a319c1a4 | 597 | int ret = 0, irq; |
b5e89ed5 | 598 | |
27641c3f MK |
599 | /* if we haven't irq we fallback for compatibility reasons - |
600 | * this used to be a separate function in drm_dma.h | |
601 | */ | |
1da177e4 | 602 | |
22471cf6 DV |
603 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
604 | return 0; | |
fa538645 | 605 | if (!drm_core_check_feature(dev, DRIVER_LEGACY)) |
22471cf6 | 606 | return 0; |
c78d1ca2 | 607 | /* UMS was only ever supported on pci devices. */ |
22471cf6 DV |
608 | if (WARN_ON(!dev->pdev)) |
609 | return -EINVAL; | |
1da177e4 | 610 | |
c153f45f | 611 | switch (ctl->func) { |
1da177e4 | 612 | case DRM_INST_HANDLER: |
a319c1a4 DV |
613 | irq = dev->pdev->irq; |
614 | ||
1da177e4 | 615 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
a319c1a4 | 616 | ctl->irq != irq) |
1da177e4 | 617 | return -EINVAL; |
e090c53b | 618 | mutex_lock(&dev->struct_mutex); |
bb0f1b5c | 619 | ret = drm_irq_install(dev, irq); |
e090c53b DV |
620 | mutex_unlock(&dev->struct_mutex); |
621 | ||
622 | return ret; | |
1da177e4 | 623 | case DRM_UNINST_HANDLER: |
e090c53b DV |
624 | mutex_lock(&dev->struct_mutex); |
625 | ret = drm_irq_uninstall(dev); | |
626 | mutex_unlock(&dev->struct_mutex); | |
627 | ||
628 | return ret; | |
1da177e4 LT |
629 | default: |
630 | return -EINVAL; | |
631 | } | |
632 | } | |
633 | ||
27641c3f | 634 | /** |
f5752b38 DV |
635 | * drm_calc_timestamping_constants - calculate vblank timestamp constants |
636 | * @crtc: drm_crtc whose timestamp constants should be updated. | |
637 | * @mode: display mode containing the scanout timings | |
27641c3f | 638 | * |
21b21560 VS |
639 | * Calculate and store various constants which are later |
640 | * needed by vblank and swap-completion timestamping, e.g, | |
641 | * by drm_calc_vbltimestamp_from_scanoutpos(). They are | |
f5752b38 | 642 | * derived from CRTC's true scanout timing, so they take |
21b21560 | 643 | * things like panel scaling or other adjustments into account. |
27641c3f | 644 | */ |
545cdd55 VS |
645 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, |
646 | const struct drm_display_mode *mode) | |
27641c3f | 647 | { |
0c545ac4 VS |
648 | struct drm_device *dev = crtc->dev; |
649 | unsigned int pipe = drm_crtc_index(crtc); | |
650 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
20b20203 | 651 | int linedur_ns = 0, framedur_ns = 0; |
77666b72 | 652 | int dotclock = mode->crtc_clock; |
27641c3f | 653 | |
0c545ac4 VS |
654 | if (!dev->num_crtcs) |
655 | return; | |
656 | ||
657 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
658 | return; | |
659 | ||
27641c3f MK |
660 | /* Valid dotclock? */ |
661 | if (dotclock > 0) { | |
0dae35a3 VS |
662 | int frame_size = mode->crtc_htotal * mode->crtc_vtotal; |
663 | ||
664 | /* | |
665 | * Convert scanline length in pixels and video | |
20b20203 VS |
666 | * dot clock to line duration and frame duration |
667 | * in nanoseconds: | |
27641c3f | 668 | */ |
0dae35a3 VS |
669 | linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock); |
670 | framedur_ns = div_u64((u64) frame_size * 1000000, dotclock); | |
c0ae24c1 VS |
671 | |
672 | /* | |
673 | * Fields of interlaced scanout modes are only half a frame duration. | |
674 | */ | |
675 | if (mode->flags & DRM_MODE_FLAG_INTERLACE) | |
676 | framedur_ns /= 2; | |
27641c3f | 677 | } else |
cc1ef118 | 678 | DRM_ERROR("crtc %u: Can't calculate constants, dotclock = 0!\n", |
27641c3f MK |
679 | crtc->base.id); |
680 | ||
eba1f35d VS |
681 | vblank->linedur_ns = linedur_ns; |
682 | vblank->framedur_ns = framedur_ns; | |
27641c3f | 683 | |
cc1ef118 | 684 | DRM_DEBUG("crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n", |
545cdd55 VS |
685 | crtc->base.id, mode->crtc_htotal, |
686 | mode->crtc_vtotal, mode->crtc_vdisplay); | |
20b20203 VS |
687 | DRM_DEBUG("crtc %u: clock %d kHz framedur %d linedur %d\n", |
688 | crtc->base.id, dotclock, framedur_ns, linedur_ns); | |
27641c3f MK |
689 | } |
690 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
691 | ||
692 | /** | |
f5752b38 DV |
693 | * drm_calc_vbltimestamp_from_scanoutpos - precise vblank timestamp helper |
694 | * @dev: DRM device | |
cc1ef118 | 695 | * @pipe: index of CRTC whose vblank timestamp to retrieve |
f5752b38 DV |
696 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) |
697 | * On return contains true maximum error of timestamp | |
698 | * @vblank_time: Pointer to struct timeval which should receive the timestamp | |
699 | * @flags: Flags to pass to driver: | |
700 | * 0 = Default, | |
701 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
f5752b38 DV |
702 | * @mode: mode which defines the scanout timings |
703 | * | |
704 | * Implements calculation of exact vblank timestamps from given drm_display_mode | |
705 | * timings and current video scanout position of a CRTC. This can be called from | |
706 | * within get_vblank_timestamp() implementation of a kms driver to implement the | |
707 | * actual timestamping. | |
27641c3f MK |
708 | * |
709 | * Should return timestamps conforming to the OML_sync_control OpenML | |
710 | * extension specification. The timestamp corresponds to the end of | |
711 | * the vblank interval, aka start of scanout of topmost-leftmost display | |
712 | * pixel in the following video frame. | |
713 | * | |
714 | * Requires support for optional dev->driver->get_scanout_position() | |
715 | * in kms driver, plus a bit of setup code to provide a drm_display_mode | |
716 | * that corresponds to the true scanout timing. | |
717 | * | |
718 | * The current implementation only handles standard video modes. It | |
719 | * returns as no operation if a doublescan or interlaced video mode is | |
720 | * active. Higher level code is expected to handle this. | |
721 | * | |
f5752b38 DV |
722 | * Returns: |
723 | * Negative value on error, failure or if not supported in current | |
27641c3f MK |
724 | * video mode: |
725 | * | |
62cacc79 DV |
726 | * -EINVAL Invalid CRTC. |
727 | * -EAGAIN Temporary unavailable, e.g., called before initial modeset. | |
728 | * -ENOTSUPP Function not supported in current display mode. | |
729 | * -EIO Failed, e.g., due to failed scanout position query. | |
27641c3f MK |
730 | * |
731 | * Returns or'ed positive status flags on success: | |
732 | * | |
733 | * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping. | |
734 | * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval. | |
735 | * | |
736 | */ | |
cc1ef118 TR |
737 | int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, |
738 | unsigned int pipe, | |
27641c3f MK |
739 | int *max_error, |
740 | struct timeval *vblank_time, | |
741 | unsigned flags, | |
7da903ef | 742 | const struct drm_display_mode *mode) |
27641c3f | 743 | { |
e62f2f5a | 744 | struct timeval tv_etime; |
d2cb58c8 | 745 | ktime_t stime, etime; |
ad1716ec VS |
746 | unsigned int vbl_status; |
747 | int ret = DRM_VBLANKTIME_SCANOUTPOS_METHOD; | |
27641c3f | 748 | int vpos, hpos, i; |
3bb403bf | 749 | int delta_ns, duration_ns; |
27641c3f | 750 | |
cc1ef118 TR |
751 | if (pipe >= dev->num_crtcs) { |
752 | DRM_ERROR("Invalid crtc %u\n", pipe); | |
27641c3f MK |
753 | return -EINVAL; |
754 | } | |
755 | ||
756 | /* Scanout position query not supported? Should not happen. */ | |
757 | if (!dev->driver->get_scanout_position) { | |
758 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); | |
759 | return -EIO; | |
760 | } | |
761 | ||
27641c3f MK |
762 | /* If mode timing undefined, just return as no-op: |
763 | * Happens during initial modesetting of a crtc. | |
764 | */ | |
3bb403bf | 765 | if (mode->crtc_clock == 0) { |
cc1ef118 | 766 | DRM_DEBUG("crtc %u: Noop due to uninitialized mode.\n", pipe); |
27641c3f MK |
767 | return -EAGAIN; |
768 | } | |
769 | ||
27641c3f MK |
770 | /* Get current scanout position with system timestamp. |
771 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
772 | * if single query takes longer than max_error nanoseconds. | |
773 | * | |
774 | * This guarantees a tight bound on maximum error if | |
775 | * code gets preempted or delayed for some reason. | |
776 | */ | |
777 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
8f6fce03 MK |
778 | /* |
779 | * Get vertical and horizontal scanout position vpos, hpos, | |
780 | * and bounding timestamps stime, etime, pre/post query. | |
781 | */ | |
3bb403bf VS |
782 | vbl_status = dev->driver->get_scanout_position(dev, pipe, flags, |
783 | &vpos, &hpos, | |
784 | &stime, &etime, | |
785 | mode); | |
27641c3f | 786 | |
27641c3f MK |
787 | /* Return as no-op if scanout query unsupported or failed. */ |
788 | if (!(vbl_status & DRM_SCANOUTPOS_VALID)) { | |
ad1716ec | 789 | DRM_DEBUG("crtc %u : scanoutpos query failed [0x%x].\n", |
cc1ef118 | 790 | pipe, vbl_status); |
27641c3f MK |
791 | return -EIO; |
792 | } | |
793 | ||
8f6fce03 | 794 | /* Compute uncertainty in timestamp of scanout position query. */ |
e62f2f5a | 795 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); |
27641c3f MK |
796 | |
797 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
3c184f69 | 798 | if (duration_ns <= *max_error) |
27641c3f MK |
799 | break; |
800 | } | |
801 | ||
802 | /* Noisy system timing? */ | |
803 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
cc1ef118 TR |
804 | DRM_DEBUG("crtc %u: Noisy timestamp %d us > %d us [%d reps].\n", |
805 | pipe, duration_ns/1000, *max_error/1000, i); | |
27641c3f MK |
806 | } |
807 | ||
808 | /* Return upper bound of timestamp precision error. */ | |
3c184f69 | 809 | *max_error = duration_ns; |
27641c3f MK |
810 | |
811 | /* Check if in vblank area: | |
812 | * vpos is >=0 in video scanout area, but negative | |
813 | * within vblank area, counting down the number of lines until | |
814 | * start of scanout. | |
815 | */ | |
ad1716ec VS |
816 | if (vbl_status & DRM_SCANOUTPOS_IN_VBLANK) |
817 | ret |= DRM_VBLANKTIME_IN_VBLANK; | |
27641c3f MK |
818 | |
819 | /* Convert scanout position into elapsed time at raw_time query | |
820 | * since start of scanout at first display scanline. delta_ns | |
821 | * can be negative if start of scanout hasn't happened yet. | |
822 | */ | |
3bb403bf VS |
823 | delta_ns = div_s64(1000000LL * (vpos * mode->crtc_htotal + hpos), |
824 | mode->crtc_clock); | |
27641c3f | 825 | |
c61eef72 | 826 | if (!drm_timestamp_monotonic) |
d2cb58c8 | 827 | etime = ktime_mono_to_real(etime); |
c61eef72 | 828 | |
e62f2f5a ID |
829 | /* save this only for debugging purposes */ |
830 | tv_etime = ktime_to_timeval(etime); | |
27641c3f MK |
831 | /* Subtract time delta from raw timestamp to get final |
832 | * vblank_time timestamp for end of vblank. | |
833 | */ | |
a91d7b91 | 834 | etime = ktime_sub_ns(etime, delta_ns); |
e62f2f5a | 835 | *vblank_time = ktime_to_timeval(etime); |
27641c3f | 836 | |
235fabe0 VS |
837 | DRM_DEBUG_VBL("crtc %u : v 0x%x p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n", |
838 | pipe, vbl_status, hpos, vpos, | |
839 | (long)tv_etime.tv_sec, (long)tv_etime.tv_usec, | |
840 | (long)vblank_time->tv_sec, (long)vblank_time->tv_usec, | |
841 | duration_ns/1000, i); | |
27641c3f | 842 | |
ad1716ec | 843 | return ret; |
27641c3f MK |
844 | } |
845 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); | |
846 | ||
c61eef72 ID |
847 | static struct timeval get_drm_timestamp(void) |
848 | { | |
849 | ktime_t now; | |
850 | ||
d2cb58c8 | 851 | now = drm_timestamp_monotonic ? ktime_get() : ktime_get_real(); |
c61eef72 ID |
852 | return ktime_to_timeval(now); |
853 | } | |
854 | ||
27641c3f MK |
855 | /** |
856 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
4dfd909f | 857 | * vblank interval |
27641c3f | 858 | * @dev: DRM device |
cc1ef118 | 859 | * @pipe: index of CRTC whose vblank timestamp to retrieve |
27641c3f MK |
860 | * @tvblank: Pointer to target struct timeval which should receive the timestamp |
861 | * @flags: Flags to pass to driver: | |
f5752b38 DV |
862 | * 0 = Default, |
863 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
27641c3f MK |
864 | * |
865 | * Fetches the system timestamp corresponding to the time of the most recent | |
f5752b38 | 866 | * vblank interval on specified CRTC. May call into kms-driver to |
27641c3f MK |
867 | * compute the timestamp with a high-precision GPU specific method. |
868 | * | |
869 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
870 | * call, i.e., it isn't very precisely locked to the true vblank. | |
871 | * | |
f5752b38 | 872 | * Returns: |
fb446a1a | 873 | * True if timestamp is considered to be very precise, false otherwise. |
27641c3f | 874 | */ |
fb446a1a | 875 | static bool |
cc1ef118 | 876 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, |
fb446a1a | 877 | struct timeval *tvblank, unsigned flags) |
27641c3f | 878 | { |
4a1b0714 | 879 | int ret; |
27641c3f MK |
880 | |
881 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
882 | int max_error = (int) drm_timestamp_precision * 1000; | |
883 | ||
884 | /* Query driver if possible and precision timestamping enabled. */ | |
885 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) { | |
cc1ef118 | 886 | ret = dev->driver->get_vblank_timestamp(dev, pipe, &max_error, |
27641c3f MK |
887 | tvblank, flags); |
888 | if (ret > 0) | |
fb446a1a | 889 | return true; |
27641c3f MK |
890 | } |
891 | ||
892 | /* GPU high precision timestamp query unsupported or failed. | |
c61eef72 | 893 | * Return current monotonic/gettimeofday timestamp as best estimate. |
27641c3f | 894 | */ |
c61eef72 | 895 | *tvblank = get_drm_timestamp(); |
27641c3f | 896 | |
fb446a1a | 897 | return false; |
27641c3f | 898 | } |
27641c3f | 899 | |
96d3f91e TR |
900 | /** |
901 | * drm_crtc_vblank_count - retrieve "cooked" vblank counter value | |
902 | * @crtc: which counter to retrieve | |
903 | * | |
904 | * Fetches the "cooked" vblank count value that represents the number of | |
905 | * vblank events since the system was booted, including lost events due to | |
906 | * modesetting activity. | |
907 | * | |
96d3f91e TR |
908 | * Returns: |
909 | * The software vblank counter. | |
910 | */ | |
911 | u32 drm_crtc_vblank_count(struct drm_crtc *crtc) | |
912 | { | |
913 | return drm_vblank_count(crtc->dev, drm_crtc_index(crtc)); | |
914 | } | |
915 | EXPORT_SYMBOL(drm_crtc_vblank_count); | |
916 | ||
27641c3f | 917 | /** |
cc1ef118 TR |
918 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value and the |
919 | * system timestamp corresponding to that vblank counter value. | |
27641c3f | 920 | * @dev: DRM device |
cc1ef118 | 921 | * @pipe: index of CRTC whose counter to retrieve |
27641c3f MK |
922 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. |
923 | * | |
924 | * Fetches the "cooked" vblank count value that represents the number of | |
925 | * vblank events since the system was booted, including lost events due to | |
926 | * modesetting activity. Returns corresponding system timestamp of the time | |
f5752b38 | 927 | * of the vblank interval that corresponds to the current vblank counter value. |
cf648305 TR |
928 | * |
929 | * This is the legacy version of drm_crtc_vblank_count_and_time(). | |
27641c3f | 930 | */ |
6e5f73fc GP |
931 | static u32 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe, |
932 | struct timeval *vblanktime) | |
27641c3f | 933 | { |
cc1ef118 | 934 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
d4055a9b MA |
935 | u32 vblank_count; |
936 | unsigned int seq; | |
27641c3f | 937 | |
cff52e5f AB |
938 | if (WARN_ON(pipe >= dev->num_crtcs)) { |
939 | *vblanktime = (struct timeval) { 0 }; | |
e6ae8687 | 940 | return 0; |
cff52e5f | 941 | } |
e6ae8687 | 942 | |
27641c3f | 943 | do { |
d4055a9b MA |
944 | seq = read_seqbegin(&vblank->seqlock); |
945 | vblank_count = vblank->count; | |
946 | *vblanktime = vblank->time; | |
947 | } while (read_seqretry(&vblank->seqlock, seq)); | |
27641c3f | 948 | |
d4055a9b | 949 | return vblank_count; |
27641c3f | 950 | } |
27641c3f | 951 | |
cf648305 TR |
952 | /** |
953 | * drm_crtc_vblank_count_and_time - retrieve "cooked" vblank counter value | |
954 | * and the system timestamp corresponding to that vblank counter value | |
955 | * @crtc: which counter to retrieve | |
956 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. | |
957 | * | |
958 | * Fetches the "cooked" vblank count value that represents the number of | |
959 | * vblank events since the system was booted, including lost events due to | |
960 | * modesetting activity. Returns corresponding system timestamp of the time | |
961 | * of the vblank interval that corresponds to the current vblank counter value. | |
cf648305 TR |
962 | */ |
963 | u32 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc, | |
964 | struct timeval *vblanktime) | |
965 | { | |
966 | return drm_vblank_count_and_time(crtc->dev, drm_crtc_index(crtc), | |
967 | vblanktime); | |
968 | } | |
969 | EXPORT_SYMBOL(drm_crtc_vblank_count_and_time); | |
970 | ||
c6eefa17 RC |
971 | static void send_vblank_event(struct drm_device *dev, |
972 | struct drm_pending_vblank_event *e, | |
973 | unsigned long seq, struct timeval *now) | |
974 | { | |
c6eefa17 RC |
975 | e->event.sequence = seq; |
976 | e->event.tv_sec = now->tv_sec; | |
977 | e->event.tv_usec = now->tv_usec; | |
978 | ||
c6eefa17 RC |
979 | trace_drm_vblank_event_delivered(e->base.pid, e->pipe, |
980 | e->event.sequence); | |
c001da4f MA |
981 | |
982 | drm_send_event_locked(dev, &e->base); | |
c6eefa17 RC |
983 | } |
984 | ||
bbc8764f DV |
985 | /** |
986 | * drm_crtc_arm_vblank_event - arm vblank event after pageflip | |
987 | * @crtc: the source CRTC of the vblank event | |
988 | * @e: the event to send | |
989 | * | |
990 | * A lot of drivers need to generate vblank events for the very next vblank | |
991 | * interrupt. For example when the page flip interrupt happens when the page | |
992 | * flip gets armed, but not when it actually executes within the next vblank | |
993 | * period. This helper function implements exactly the required vblank arming | |
994 | * behaviour. | |
995 | * | |
61802130 DV |
996 | * NOTE: Drivers using this to send out the event in struct &drm_crtc_state |
997 | * as part of an atomic commit must ensure that the next vblank happens at | |
998 | * exactly the same time as the atomic commit is committed to the hardware. This | |
999 | * function itself does **not** protect again the next vblank interrupt racing | |
1000 | * with either this function call or the atomic commit operation. A possible | |
1001 | * sequence could be: | |
1002 | * | |
1003 | * 1. Driver commits new hardware state into vblank-synchronized registers. | |
1004 | * 2. A vblank happens, committing the hardware state. Also the corresponding | |
1005 | * vblank interrupt is fired off and fully processed by the interrupt | |
1006 | * handler. | |
1007 | * 3. The atomic commit operation proceeds to call drm_crtc_arm_vblank_event(). | |
1008 | * 4. The event is only send out for the next vblank, which is wrong. | |
1009 | * | |
1010 | * An equivalent race can happen when the driver calls | |
1011 | * drm_crtc_arm_vblank_event() before writing out the new hardware state. | |
1012 | * | |
1013 | * The only way to make this work safely is to prevent the vblank from firing | |
1014 | * (and the hardware from committing anything else) until the entire atomic | |
1015 | * commit sequence has run to completion. If the hardware does not have such a | |
1016 | * feature (e.g. using a "go" bit), then it is unsafe to use this functions. | |
1017 | * Instead drivers need to manually send out the event from their interrupt | |
1018 | * handler by calling drm_crtc_send_vblank_event() and make sure that there's no | |
1019 | * possible race with the hardware committing the atomic update. | |
1020 | * | |
bbc8764f DV |
1021 | * Caller must hold event lock. Caller must also hold a vblank reference for |
1022 | * the event @e, which will be dropped when the next vblank arrives. | |
bbc8764f DV |
1023 | */ |
1024 | void drm_crtc_arm_vblank_event(struct drm_crtc *crtc, | |
1025 | struct drm_pending_vblank_event *e) | |
1026 | { | |
93507d13 GP |
1027 | struct drm_device *dev = crtc->dev; |
1028 | unsigned int pipe = drm_crtc_index(crtc); | |
1029 | ||
1030 | assert_spin_locked(&dev->event_lock); | |
1031 | ||
1032 | e->pipe = pipe; | |
1033 | e->event.sequence = drm_vblank_count(dev, pipe); | |
1034 | list_add_tail(&e->base.link, &dev->vblank_event_list); | |
bbc8764f DV |
1035 | } |
1036 | EXPORT_SYMBOL(drm_crtc_arm_vblank_event); | |
1037 | ||
c6eefa17 | 1038 | /** |
db749b7e GP |
1039 | * drm_crtc_send_vblank_event - helper to send vblank event after pageflip |
1040 | * @crtc: the source CRTC of the vblank event | |
c6eefa17 RC |
1041 | * @e: the event to send |
1042 | * | |
61802130 DV |
1043 | * Updates sequence # and timestamp on event for the most recently processed |
1044 | * vblank, and sends it to userspace. Caller must hold event lock. | |
1045 | * | |
1046 | * See drm_crtc_arm_vblank_event() for a helper which can be used in certain | |
1047 | * situation, especially to send out events for atomic commit operations. | |
c6eefa17 | 1048 | */ |
db749b7e GP |
1049 | void drm_crtc_send_vblank_event(struct drm_crtc *crtc, |
1050 | struct drm_pending_vblank_event *e) | |
c6eefa17 | 1051 | { |
db749b7e GP |
1052 | struct drm_device *dev = crtc->dev; |
1053 | unsigned int seq, pipe = drm_crtc_index(crtc); | |
c6eefa17 | 1054 | struct timeval now; |
4dfd909f | 1055 | |
2a7d3d6d | 1056 | if (dev->num_crtcs > 0) { |
cc1ef118 | 1057 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
c6eefa17 RC |
1058 | } else { |
1059 | seq = 0; | |
c61eef72 ID |
1060 | |
1061 | now = get_drm_timestamp(); | |
c6eefa17 | 1062 | } |
cc1ef118 | 1063 | e->pipe = pipe; |
c6eefa17 RC |
1064 | send_vblank_event(dev, e, seq, &now); |
1065 | } | |
a4d7b30d TR |
1066 | EXPORT_SYMBOL(drm_crtc_send_vblank_event); |
1067 | ||
f2752282 VS |
1068 | /** |
1069 | * drm_vblank_enable - enable the vblank interrupt on a CRTC | |
1070 | * @dev: DRM device | |
cc1ef118 | 1071 | * @pipe: CRTC index |
c30e11fc TR |
1072 | * |
1073 | * Returns: | |
1074 | * Zero on success or a negative error code on failure. | |
f2752282 | 1075 | */ |
cc1ef118 | 1076 | static int drm_vblank_enable(struct drm_device *dev, unsigned int pipe) |
f2752282 | 1077 | { |
cc1ef118 | 1078 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
f2752282 VS |
1079 | int ret = 0; |
1080 | ||
1081 | assert_spin_locked(&dev->vbl_lock); | |
1082 | ||
1083 | spin_lock(&dev->vblank_time_lock); | |
1084 | ||
8a51d5be | 1085 | if (!vblank->enabled) { |
1cfb80b1 DV |
1086 | /* |
1087 | * Enable vblank irqs under vblank_time_lock protection. | |
f2752282 VS |
1088 | * All vblank count & timestamp updates are held off |
1089 | * until we are done reinitializing master counter and | |
1090 | * timestamps. Filtercode in drm_handle_vblank() will | |
1091 | * prevent double-accounting of same vblank interval. | |
1092 | */ | |
cc1ef118 TR |
1093 | ret = dev->driver->enable_vblank(dev, pipe); |
1094 | DRM_DEBUG("enabling vblank on crtc %u, ret: %d\n", pipe, ret); | |
f2752282 | 1095 | if (ret) |
8a51d5be | 1096 | atomic_dec(&vblank->refcount); |
f2752282 | 1097 | else { |
8a51d5be | 1098 | vblank->enabled = true; |
a6e610dc | 1099 | drm_update_vblank_count(dev, pipe, 0); |
f2752282 VS |
1100 | } |
1101 | } | |
1102 | ||
1103 | spin_unlock(&dev->vblank_time_lock); | |
1104 | ||
1105 | return ret; | |
1106 | } | |
1107 | ||
0a3e67a4 JB |
1108 | /** |
1109 | * drm_vblank_get - get a reference count on vblank events | |
1110 | * @dev: DRM device | |
cc1ef118 | 1111 | * @pipe: index of CRTC to own |
0a3e67a4 JB |
1112 | * |
1113 | * Acquire a reference count on vblank events to avoid having them disabled | |
1114 | * while in use. | |
1115 | * | |
89dd6a4b DV |
1116 | * This is the legacy version of drm_crtc_vblank_get(). |
1117 | * | |
f5752b38 | 1118 | * Returns: |
c30e11fc | 1119 | * Zero on success or a negative error code on failure. |
0a3e67a4 | 1120 | */ |
ceb74152 | 1121 | static int drm_vblank_get(struct drm_device *dev, unsigned int pipe) |
0a3e67a4 | 1122 | { |
cc1ef118 | 1123 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
97cbc883 | 1124 | unsigned long irqflags; |
0a3e67a4 JB |
1125 | int ret = 0; |
1126 | ||
16e3247d GH |
1127 | if (!dev->num_crtcs) |
1128 | return -EINVAL; | |
1129 | ||
cc1ef118 | 1130 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1131 | return -EINVAL; |
1132 | ||
0a3e67a4 JB |
1133 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
1134 | /* Going from 0->1 means we have to enable interrupts again */ | |
8a51d5be | 1135 | if (atomic_add_return(1, &vblank->refcount) == 1) { |
cc1ef118 | 1136 | ret = drm_vblank_enable(dev, pipe); |
778c9026 | 1137 | } else { |
8a51d5be VS |
1138 | if (!vblank->enabled) { |
1139 | atomic_dec(&vblank->refcount); | |
778c9026 | 1140 | ret = -EINVAL; |
0a3e67a4 JB |
1141 | } |
1142 | } | |
1143 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1144 | ||
1145 | return ret; | |
1146 | } | |
0a3e67a4 | 1147 | |
89dd6a4b DV |
1148 | /** |
1149 | * drm_crtc_vblank_get - get a reference count on vblank events | |
1150 | * @crtc: which CRTC to own | |
1151 | * | |
1152 | * Acquire a reference count on vblank events to avoid having them disabled | |
1153 | * while in use. | |
1154 | * | |
89dd6a4b | 1155 | * Returns: |
c30e11fc | 1156 | * Zero on success or a negative error code on failure. |
89dd6a4b DV |
1157 | */ |
1158 | int drm_crtc_vblank_get(struct drm_crtc *crtc) | |
1159 | { | |
1160 | return drm_vblank_get(crtc->dev, drm_crtc_index(crtc)); | |
1161 | } | |
1162 | EXPORT_SYMBOL(drm_crtc_vblank_get); | |
1163 | ||
0a3e67a4 | 1164 | /** |
cc1ef118 | 1165 | * drm_vblank_put - release ownership of vblank events |
0a3e67a4 | 1166 | * @dev: DRM device |
cc1ef118 | 1167 | * @pipe: index of CRTC to release |
0a3e67a4 JB |
1168 | * |
1169 | * Release ownership of a given vblank counter, turning off interrupts | |
27641c3f | 1170 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. |
89dd6a4b DV |
1171 | * |
1172 | * This is the legacy version of drm_crtc_vblank_put(). | |
0a3e67a4 | 1173 | */ |
ceb74152 | 1174 | static void drm_vblank_put(struct drm_device *dev, unsigned int pipe) |
0a3e67a4 | 1175 | { |
cc1ef118 | 1176 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
8a51d5be | 1177 | |
cc1ef118 | 1178 | if (WARN_ON(pipe >= dev->num_crtcs)) |
7f907bf2 | 1179 | return; |
b3f5e732 | 1180 | |
7d1de851 | 1181 | if (WARN_ON(atomic_read(&vblank->refcount) == 0)) |
e6ae8687 RC |
1182 | return; |
1183 | ||
0a3e67a4 | 1184 | /* Last user schedules interrupt disable */ |
4ed0ce3d | 1185 | if (atomic_dec_and_test(&vblank->refcount)) { |
ab8905f1 DV |
1186 | if (drm_vblank_offdelay == 0) |
1187 | return; | |
1188 | else if (dev->vblank_disable_immediate || drm_vblank_offdelay < 0) | |
4ed0ce3d | 1189 | vblank_disable_fn((unsigned long)vblank); |
ab8905f1 | 1190 | else |
4ed0ce3d VS |
1191 | mod_timer(&vblank->disable_timer, |
1192 | jiffies + ((drm_vblank_offdelay * HZ)/1000)); | |
1193 | } | |
0a3e67a4 | 1194 | } |
0a3e67a4 | 1195 | |
89dd6a4b DV |
1196 | /** |
1197 | * drm_crtc_vblank_put - give up ownership of vblank events | |
1198 | * @crtc: which counter to give up | |
1199 | * | |
1200 | * Release ownership of a given vblank counter, turning off interrupts | |
1201 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. | |
89dd6a4b DV |
1202 | */ |
1203 | void drm_crtc_vblank_put(struct drm_crtc *crtc) | |
1204 | { | |
1205 | drm_vblank_put(crtc->dev, drm_crtc_index(crtc)); | |
1206 | } | |
1207 | EXPORT_SYMBOL(drm_crtc_vblank_put); | |
1208 | ||
e8450f51 DV |
1209 | /** |
1210 | * drm_wait_one_vblank - wait for one vblank | |
1211 | * @dev: DRM device | |
cc1ef118 | 1212 | * @pipe: CRTC index |
e8450f51 | 1213 | * |
1da248a5 VS |
1214 | * This waits for one vblank to pass on @pipe, using the irq driver interfaces. |
1215 | * It is a failure to call this when the vblank irq for @pipe is disabled, e.g. | |
e8450f51 DV |
1216 | * due to lack of driver support or because the crtc is off. |
1217 | */ | |
cc1ef118 | 1218 | void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe) |
e8450f51 | 1219 | { |
cc1ef118 | 1220 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
e8450f51 DV |
1221 | int ret; |
1222 | u32 last; | |
1223 | ||
cc1ef118 | 1224 | if (WARN_ON(pipe >= dev->num_crtcs)) |
7d1de851 TR |
1225 | return; |
1226 | ||
cc1ef118 TR |
1227 | ret = drm_vblank_get(dev, pipe); |
1228 | if (WARN(ret, "vblank not available on crtc %i, ret=%i\n", pipe, ret)) | |
e8450f51 DV |
1229 | return; |
1230 | ||
cc1ef118 | 1231 | last = drm_vblank_count(dev, pipe); |
e8450f51 | 1232 | |
cc1ef118 TR |
1233 | ret = wait_event_timeout(vblank->queue, |
1234 | last != drm_vblank_count(dev, pipe), | |
e8450f51 DV |
1235 | msecs_to_jiffies(100)); |
1236 | ||
cc1ef118 | 1237 | WARN(ret == 0, "vblank wait timed out on crtc %i\n", pipe); |
e8450f51 | 1238 | |
cc1ef118 | 1239 | drm_vblank_put(dev, pipe); |
e8450f51 DV |
1240 | } |
1241 | EXPORT_SYMBOL(drm_wait_one_vblank); | |
1242 | ||
1243 | /** | |
1244 | * drm_crtc_wait_one_vblank - wait for one vblank | |
1245 | * @crtc: DRM crtc | |
1246 | * | |
1247 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. | |
1248 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. | |
1249 | * due to lack of driver support or because the crtc is off. | |
1250 | */ | |
1251 | void drm_crtc_wait_one_vblank(struct drm_crtc *crtc) | |
1252 | { | |
1253 | drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1254 | } | |
1255 | EXPORT_SYMBOL(drm_crtc_wait_one_vblank); | |
1256 | ||
c6eefa17 RC |
1257 | /** |
1258 | * drm_vblank_off - disable vblank events on a CRTC | |
1259 | * @dev: DRM device | |
cc1ef118 | 1260 | * @pipe: CRTC index |
c6eefa17 | 1261 | * |
f5752b38 DV |
1262 | * Drivers can use this function to shut down the vblank interrupt handling when |
1263 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1264 | * stored so that drm_vblank_on() can restore it again. | |
1265 | * | |
1266 | * Drivers must use this function when the hardware vblank counter can get | |
1267 | * reset, e.g. when suspending. | |
89dd6a4b DV |
1268 | * |
1269 | * This is the legacy version of drm_crtc_vblank_off(). | |
c6eefa17 | 1270 | */ |
cc1ef118 | 1271 | void drm_vblank_off(struct drm_device *dev, unsigned int pipe) |
778c9026 | 1272 | { |
cc1ef118 | 1273 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
498548ec CJHR |
1274 | struct drm_pending_vblank_event *e, *t; |
1275 | struct timeval now; | |
778c9026 | 1276 | unsigned long irqflags; |
498548ec | 1277 | unsigned int seq; |
778c9026 | 1278 | |
cc1ef118 | 1279 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1280 | return; |
1281 | ||
56cc279b VS |
1282 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1283 | ||
1284 | spin_lock(&dev->vbl_lock); | |
e8235891 MK |
1285 | DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n", |
1286 | pipe, vblank->enabled, vblank->inmodeset); | |
1287 | ||
1288 | /* Avoid redundant vblank disables without previous drm_vblank_on(). */ | |
1289 | if (drm_core_check_feature(dev, DRIVER_ATOMIC) || !vblank->inmodeset) | |
1290 | vblank_disable_and_save(dev, pipe); | |
1291 | ||
8a51d5be | 1292 | wake_up(&vblank->queue); |
498548ec | 1293 | |
56cc279b VS |
1294 | /* |
1295 | * Prevent subsequent drm_vblank_get() from re-enabling | |
1296 | * the vblank interrupt by bumping the refcount. | |
1297 | */ | |
1298 | if (!vblank->inmodeset) { | |
1299 | atomic_inc(&vblank->refcount); | |
1300 | vblank->inmodeset = 1; | |
1301 | } | |
1302 | spin_unlock(&dev->vbl_lock); | |
1303 | ||
498548ec | 1304 | /* Send any queued vblank events, lest the natives grow disquiet */ |
cc1ef118 | 1305 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
e7783ba3 | 1306 | |
498548ec | 1307 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { |
cc1ef118 | 1308 | if (e->pipe != pipe) |
498548ec | 1309 | continue; |
44844892 | 1310 | DRM_DEBUG("Sending premature vblank event on disable: " |
1d776851 | 1311 | "wanted %u, current %u\n", |
498548ec | 1312 | e->event.sequence, seq); |
c6eefa17 | 1313 | list_del(&e->base.link); |
cc1ef118 | 1314 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1315 | send_vblank_event(dev, e, seq, &now); |
498548ec | 1316 | } |
56cc279b | 1317 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
778c9026 LP |
1318 | } |
1319 | EXPORT_SYMBOL(drm_vblank_off); | |
1320 | ||
89dd6a4b DV |
1321 | /** |
1322 | * drm_crtc_vblank_off - disable vblank events on a CRTC | |
1323 | * @crtc: CRTC in question | |
1324 | * | |
1325 | * Drivers can use this function to shut down the vblank interrupt handling when | |
1326 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1327 | * stored so that drm_vblank_on can restore it again. | |
1328 | * | |
1329 | * Drivers must use this function when the hardware vblank counter can get | |
1330 | * reset, e.g. when suspending. | |
1331 | * | |
1332 | * This is the native kms version of drm_vblank_off(). | |
1333 | */ | |
1334 | void drm_crtc_vblank_off(struct drm_crtc *crtc) | |
1335 | { | |
1336 | drm_vblank_off(crtc->dev, drm_crtc_index(crtc)); | |
1337 | } | |
1338 | EXPORT_SYMBOL(drm_crtc_vblank_off); | |
1339 | ||
9625604c DV |
1340 | /** |
1341 | * drm_crtc_vblank_reset - reset vblank state to off on a CRTC | |
2b193f02 | 1342 | * @crtc: CRTC in question |
9625604c DV |
1343 | * |
1344 | * Drivers can use this function to reset the vblank state to off at load time. | |
1345 | * Drivers should use this together with the drm_crtc_vblank_off() and | |
1346 | * drm_crtc_vblank_on() functions. The difference compared to | |
1347 | * drm_crtc_vblank_off() is that this function doesn't save the vblank counter | |
1348 | * and hence doesn't need to call any driver hooks. | |
1349 | */ | |
2b193f02 | 1350 | void drm_crtc_vblank_reset(struct drm_crtc *crtc) |
9625604c | 1351 | { |
2b193f02 | 1352 | struct drm_device *dev = crtc->dev; |
9625604c | 1353 | unsigned long irqflags; |
2b193f02 | 1354 | unsigned int pipe = drm_crtc_index(crtc); |
1da248a5 | 1355 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
9625604c DV |
1356 | |
1357 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1358 | /* | |
1359 | * Prevent subsequent drm_vblank_get() from enabling the vblank | |
1360 | * interrupt by bumping the refcount. | |
1361 | */ | |
1362 | if (!vblank->inmodeset) { | |
1363 | atomic_inc(&vblank->refcount); | |
1364 | vblank->inmodeset = 1; | |
1365 | } | |
1366 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1367 | ||
1368 | WARN_ON(!list_empty(&dev->vblank_event_list)); | |
1369 | } | |
1370 | EXPORT_SYMBOL(drm_crtc_vblank_reset); | |
1371 | ||
f2752282 VS |
1372 | /** |
1373 | * drm_vblank_on - enable vblank events on a CRTC | |
1374 | * @dev: DRM device | |
cc1ef118 | 1375 | * @pipe: CRTC index |
f5752b38 DV |
1376 | * |
1377 | * This functions restores the vblank interrupt state captured with | |
1378 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
32197aab | 1379 | * drm_vblank_off() can be unbalanced and so can also be unconditionally called |
f5752b38 | 1380 | * in driver load code to reflect the current hardware state of the crtc. |
89dd6a4b DV |
1381 | * |
1382 | * This is the legacy version of drm_crtc_vblank_on(). | |
f2752282 | 1383 | */ |
cc1ef118 | 1384 | void drm_vblank_on(struct drm_device *dev, unsigned int pipe) |
f2752282 | 1385 | { |
cc1ef118 | 1386 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
f2752282 VS |
1387 | unsigned long irqflags; |
1388 | ||
cc1ef118 | 1389 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1390 | return; |
1391 | ||
f2752282 | 1392 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
e8235891 MK |
1393 | DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n", |
1394 | pipe, vblank->enabled, vblank->inmodeset); | |
1395 | ||
7ffd7a68 | 1396 | /* Drop our private "prevent drm_vblank_get" refcount */ |
8a51d5be VS |
1397 | if (vblank->inmodeset) { |
1398 | atomic_dec(&vblank->refcount); | |
1399 | vblank->inmodeset = 0; | |
7ffd7a68 | 1400 | } |
f8ad028c | 1401 | |
4dfd6486 VS |
1402 | drm_reset_vblank_timestamp(dev, pipe); |
1403 | ||
cd19e52a VS |
1404 | /* |
1405 | * re-enable interrupts if there are users left, or the | |
1406 | * user wishes vblank interrupts to be enabled all the time. | |
1407 | */ | |
bb74fc1b | 1408 | if (atomic_read(&vblank->refcount) != 0 || drm_vblank_offdelay == 0) |
cc1ef118 | 1409 | WARN_ON(drm_vblank_enable(dev, pipe)); |
f2752282 VS |
1410 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
1411 | } | |
1412 | EXPORT_SYMBOL(drm_vblank_on); | |
1413 | ||
89dd6a4b DV |
1414 | /** |
1415 | * drm_crtc_vblank_on - enable vblank events on a CRTC | |
1416 | * @crtc: CRTC in question | |
1417 | * | |
1418 | * This functions restores the vblank interrupt state captured with | |
1419 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
32197aab | 1420 | * drm_vblank_off() can be unbalanced and so can also be unconditionally called |
89dd6a4b DV |
1421 | * in driver load code to reflect the current hardware state of the crtc. |
1422 | * | |
1423 | * This is the native kms version of drm_vblank_on(). | |
1424 | */ | |
1425 | void drm_crtc_vblank_on(struct drm_crtc *crtc) | |
1426 | { | |
1427 | drm_vblank_on(crtc->dev, drm_crtc_index(crtc)); | |
1428 | } | |
1429 | EXPORT_SYMBOL(drm_crtc_vblank_on); | |
1430 | ||
07600c53 DV |
1431 | static void drm_legacy_vblank_pre_modeset(struct drm_device *dev, |
1432 | unsigned int pipe) | |
f453ba04 | 1433 | { |
cc1ef118 | 1434 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
8a51d5be | 1435 | |
b7ea85a4 | 1436 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
e77cef9c JG |
1437 | if (!dev->num_crtcs) |
1438 | return; | |
e6ae8687 | 1439 | |
cc1ef118 | 1440 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1441 | return; |
1442 | ||
f453ba04 DA |
1443 | /* |
1444 | * To avoid all the problems that might happen if interrupts | |
1445 | * were enabled/disabled around or between these calls, we just | |
1446 | * have the kernel take a reference on the CRTC (just once though | |
1447 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
1448 | * so that interrupts remain enabled in the interim. | |
1449 | */ | |
8a51d5be VS |
1450 | if (!vblank->inmodeset) { |
1451 | vblank->inmodeset = 0x1; | |
cc1ef118 | 1452 | if (drm_vblank_get(dev, pipe) == 0) |
8a51d5be | 1453 | vblank->inmodeset |= 0x2; |
f453ba04 DA |
1454 | } |
1455 | } | |
f453ba04 | 1456 | |
07600c53 DV |
1457 | static void drm_legacy_vblank_post_modeset(struct drm_device *dev, |
1458 | unsigned int pipe) | |
f453ba04 | 1459 | { |
cc1ef118 | 1460 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
f453ba04 DA |
1461 | unsigned long irqflags; |
1462 | ||
b7ea85a4 HC |
1463 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
1464 | if (!dev->num_crtcs) | |
1465 | return; | |
1466 | ||
cc1ef118 | 1467 | if (WARN_ON(pipe >= dev->num_crtcs)) |
7d1de851 TR |
1468 | return; |
1469 | ||
8a51d5be | 1470 | if (vblank->inmodeset) { |
f453ba04 | 1471 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
c61934ed | 1472 | drm_reset_vblank_timestamp(dev, pipe); |
f453ba04 | 1473 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
b3f5e732 | 1474 | |
8a51d5be | 1475 | if (vblank->inmodeset & 0x2) |
cc1ef118 | 1476 | drm_vblank_put(dev, pipe); |
b3f5e732 | 1477 | |
8a51d5be | 1478 | vblank->inmodeset = 0; |
f453ba04 DA |
1479 | } |
1480 | } | |
f453ba04 | 1481 | |
f5752b38 | 1482 | /* |
0a3e67a4 JB |
1483 | * drm_modeset_ctl - handle vblank event counter changes across mode switch |
1484 | * @DRM_IOCTL_ARGS: standard ioctl arguments | |
1485 | * | |
1486 | * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET | |
1487 | * ioctls around modesetting so that any lost vblank events are accounted for. | |
1488 | * | |
1489 | * Generally the counter will reset across mode sets. If interrupts are | |
1490 | * enabled around this call, we don't have to do anything since the counter | |
1491 | * will have already been incremented. | |
1492 | */ | |
1493 | int drm_modeset_ctl(struct drm_device *dev, void *data, | |
1494 | struct drm_file *file_priv) | |
1495 | { | |
1496 | struct drm_modeset_ctl *modeset = data; | |
cc1ef118 | 1497 | unsigned int pipe; |
0a3e67a4 JB |
1498 | |
1499 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
1500 | if (!dev->num_crtcs) | |
4a1b0714 | 1501 | return 0; |
0a3e67a4 | 1502 | |
29935554 | 1503 | /* KMS drivers handle this internally */ |
fa538645 | 1504 | if (!drm_core_check_feature(dev, DRIVER_LEGACY)) |
29935554 LP |
1505 | return 0; |
1506 | ||
cc1ef118 TR |
1507 | pipe = modeset->crtc; |
1508 | if (pipe >= dev->num_crtcs) | |
4a1b0714 | 1509 | return -EINVAL; |
0a3e67a4 | 1510 | |
0a3e67a4 JB |
1511 | switch (modeset->cmd) { |
1512 | case _DRM_PRE_MODESET: | |
07600c53 | 1513 | drm_legacy_vblank_pre_modeset(dev, pipe); |
0a3e67a4 JB |
1514 | break; |
1515 | case _DRM_POST_MODESET: | |
07600c53 | 1516 | drm_legacy_vblank_post_modeset(dev, pipe); |
0a3e67a4 JB |
1517 | break; |
1518 | default: | |
4a1b0714 | 1519 | return -EINVAL; |
0a3e67a4 JB |
1520 | } |
1521 | ||
4a1b0714 | 1522 | return 0; |
0a3e67a4 JB |
1523 | } |
1524 | ||
cc1ef118 | 1525 | static int drm_queue_vblank_event(struct drm_device *dev, unsigned int pipe, |
c9a9c5e0 KH |
1526 | union drm_wait_vblank *vblwait, |
1527 | struct drm_file *file_priv) | |
1528 | { | |
ffe7c73a | 1529 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
c9a9c5e0 KH |
1530 | struct drm_pending_vblank_event *e; |
1531 | struct timeval now; | |
1532 | unsigned long flags; | |
1533 | unsigned int seq; | |
ea5d552c | 1534 | int ret; |
c9a9c5e0 | 1535 | |
f76511b9 | 1536 | e = kzalloc(sizeof(*e), GFP_KERNEL); |
ea5d552c CW |
1537 | if (e == NULL) { |
1538 | ret = -ENOMEM; | |
1539 | goto err_put; | |
1540 | } | |
c9a9c5e0 KH |
1541 | |
1542 | e->pipe = pipe; | |
b9c2c9ae | 1543 | e->base.pid = current->pid; |
c9a9c5e0 | 1544 | e->event.base.type = DRM_EVENT_VBLANK; |
f76511b9 | 1545 | e->event.base.length = sizeof(e->event); |
c9a9c5e0 | 1546 | e->event.user_data = vblwait->request.signal; |
c9a9c5e0 | 1547 | |
c9a9c5e0 KH |
1548 | spin_lock_irqsave(&dev->event_lock, flags); |
1549 | ||
ffe7c73a VS |
1550 | /* |
1551 | * drm_vblank_off() might have been called after we called | |
1552 | * drm_vblank_get(). drm_vblank_off() holds event_lock | |
1553 | * around the vblank disable, so no need for further locking. | |
1554 | * The reference from drm_vblank_get() protects against | |
1555 | * vblank disable from another source. | |
1556 | */ | |
1557 | if (!vblank->enabled) { | |
1558 | ret = -EINVAL; | |
1559 | goto err_unlock; | |
1560 | } | |
1561 | ||
4020b220 DV |
1562 | ret = drm_event_reserve_init_locked(dev, file_priv, &e->base, |
1563 | &e->event.base); | |
1564 | ||
1565 | if (ret) | |
ea5d552c | 1566 | goto err_unlock; |
c9a9c5e0 | 1567 | |
27641c3f MK |
1568 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1569 | ||
1d776851 | 1570 | DRM_DEBUG("event on vblank count %u, current %u, crtc %u\n", |
c9a9c5e0 KH |
1571 | vblwait->request.sequence, seq, pipe); |
1572 | ||
b9c2c9ae JB |
1573 | trace_drm_vblank_event_queued(current->pid, pipe, |
1574 | vblwait->request.sequence); | |
1575 | ||
c9a9c5e0 KH |
1576 | e->event.sequence = vblwait->request.sequence; |
1577 | if ((seq - vblwait->request.sequence) <= (1 << 23)) { | |
6f331623 | 1578 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1579 | send_vblank_event(dev, e, seq, &now); |
000fa7cf | 1580 | vblwait->reply.sequence = seq; |
c9a9c5e0 | 1581 | } else { |
a6778e9e | 1582 | /* drm_handle_vblank_events will call drm_vblank_put */ |
c9a9c5e0 | 1583 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
000fa7cf | 1584 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1585 | } |
1586 | ||
1587 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1588 | ||
1589 | return 0; | |
ea5d552c CW |
1590 | |
1591 | err_unlock: | |
1592 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1593 | kfree(e); | |
1594 | err_put: | |
6f331623 | 1595 | drm_vblank_put(dev, pipe); |
ea5d552c | 1596 | return ret; |
c9a9c5e0 KH |
1597 | } |
1598 | ||
f5752b38 | 1599 | /* |
1da177e4 LT |
1600 | * Wait for VBLANK. |
1601 | * | |
1602 | * \param inode device inode. | |
6c340eac | 1603 | * \param file_priv DRM file private. |
1da177e4 LT |
1604 | * \param cmd command. |
1605 | * \param data user argument, pointing to a drm_wait_vblank structure. | |
1606 | * \return zero on success or a negative number on failure. | |
1607 | * | |
30b23634 EA |
1608 | * This function enables the vblank interrupt on the pipe requested, then |
1609 | * sleeps waiting for the requested sequence number to occur, and drops | |
f5752b38 | 1610 | * the vblank interrupt refcount afterwards. (vblank IRQ disable follows that |
30b23634 | 1611 | * after a timeout with no further vblank waits scheduled). |
1da177e4 | 1612 | */ |
0a3e67a4 JB |
1613 | int drm_wait_vblank(struct drm_device *dev, void *data, |
1614 | struct drm_file *file_priv) | |
1da177e4 | 1615 | { |
8a51d5be | 1616 | struct drm_vblank_crtc *vblank; |
c153f45f | 1617 | union drm_wait_vblank *vblwait = data; |
4a1b0714 | 1618 | int ret; |
cc1ef118 | 1619 | unsigned int flags, seq, pipe, high_pipe; |
1da177e4 | 1620 | |
4984979b DV |
1621 | if (!dev->irq_enabled) |
1622 | return -EINVAL; | |
1da177e4 | 1623 | |
30b23634 EA |
1624 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) |
1625 | return -EINVAL; | |
1626 | ||
c153f45f | 1627 | if (vblwait->request.type & |
19b01b5f IH |
1628 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1629 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
776c9443 | 1630 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", |
c153f45f | 1631 | vblwait->request.type, |
19b01b5f IH |
1632 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1633 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
776c9443 MD |
1634 | return -EINVAL; |
1635 | } | |
1636 | ||
c153f45f | 1637 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
cc1ef118 TR |
1638 | high_pipe = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); |
1639 | if (high_pipe) | |
1640 | pipe = high_pipe >> _DRM_VBLANK_HIGH_CRTC_SHIFT; | |
19b01b5f | 1641 | else |
cc1ef118 TR |
1642 | pipe = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; |
1643 | if (pipe >= dev->num_crtcs) | |
776c9443 MD |
1644 | return -EINVAL; |
1645 | ||
cc1ef118 | 1646 | vblank = &dev->vblank[pipe]; |
8a51d5be | 1647 | |
cc1ef118 | 1648 | ret = drm_vblank_get(dev, pipe); |
0a3e67a4 | 1649 | if (ret) { |
8d3457ec | 1650 | DRM_DEBUG("failed to acquire vblank counter, %d\n", ret); |
0a3e67a4 JB |
1651 | return ret; |
1652 | } | |
cc1ef118 | 1653 | seq = drm_vblank_count(dev, pipe); |
776c9443 | 1654 | |
c153f45f | 1655 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
1da177e4 | 1656 | case _DRM_VBLANK_RELATIVE: |
c153f45f EA |
1657 | vblwait->request.sequence += seq; |
1658 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |
1da177e4 LT |
1659 | case _DRM_VBLANK_ABSOLUTE: |
1660 | break; | |
1661 | default: | |
0a3e67a4 JB |
1662 | ret = -EINVAL; |
1663 | goto done; | |
1da177e4 LT |
1664 | } |
1665 | ||
97ef1ae0 MD |
1666 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
1667 | (seq - vblwait->request.sequence) <= (1 << 23)) { | |
1668 | vblwait->request.sequence = seq + 1; | |
1669 | } | |
1670 | ||
a6778e9e IH |
1671 | if (flags & _DRM_VBLANK_EVENT) { |
1672 | /* must hold on to the vblank ref until the event fires | |
1673 | * drm_vblank_put will be called asynchronously | |
1674 | */ | |
cc1ef118 | 1675 | return drm_queue_vblank_event(dev, pipe, vblwait, file_priv); |
a6778e9e | 1676 | } |
c9a9c5e0 | 1677 | |
1d776851 | 1678 | DRM_DEBUG("waiting on vblank count %u, crtc %u\n", |
cc1ef118 | 1679 | vblwait->request.sequence, pipe); |
8a51d5be | 1680 | DRM_WAIT_ON(ret, vblank->queue, 3 * HZ, |
cc1ef118 | 1681 | (((drm_vblank_count(dev, pipe) - |
30b23634 | 1682 | vblwait->request.sequence) <= (1 << 23)) || |
8a51d5be | 1683 | !vblank->enabled || |
30b23634 | 1684 | !dev->irq_enabled)); |
1da177e4 | 1685 | |
30b23634 EA |
1686 | if (ret != -EINTR) { |
1687 | struct timeval now; | |
1da177e4 | 1688 | |
cc1ef118 | 1689 | vblwait->reply.sequence = drm_vblank_count_and_time(dev, pipe, &now); |
30b23634 EA |
1690 | vblwait->reply.tval_sec = now.tv_sec; |
1691 | vblwait->reply.tval_usec = now.tv_usec; | |
27641c3f | 1692 | |
1d776851 | 1693 | DRM_DEBUG("returning %u to client\n", |
30b23634 | 1694 | vblwait->reply.sequence); |
1da177e4 | 1695 | } else { |
30b23634 | 1696 | DRM_DEBUG("vblank wait interrupted by signal\n"); |
1da177e4 LT |
1697 | } |
1698 | ||
0a3e67a4 | 1699 | done: |
cc1ef118 | 1700 | drm_vblank_put(dev, pipe); |
1da177e4 LT |
1701 | return ret; |
1702 | } | |
1703 | ||
cc1ef118 | 1704 | static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe) |
c9a9c5e0 KH |
1705 | { |
1706 | struct drm_pending_vblank_event *e, *t; | |
1707 | struct timeval now; | |
c9a9c5e0 KH |
1708 | unsigned int seq; |
1709 | ||
56cc279b | 1710 | assert_spin_locked(&dev->event_lock); |
c9a9c5e0 | 1711 | |
cc1ef118 | 1712 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
c9a9c5e0 KH |
1713 | |
1714 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
cc1ef118 | 1715 | if (e->pipe != pipe) |
c9a9c5e0 KH |
1716 | continue; |
1717 | if ((seq - e->event.sequence) > (1<<23)) | |
1718 | continue; | |
1719 | ||
1d776851 | 1720 | DRM_DEBUG("vblank event on %u, current %u\n", |
c9a9c5e0 KH |
1721 | e->event.sequence, seq); |
1722 | ||
c6eefa17 | 1723 | list_del(&e->base.link); |
cc1ef118 | 1724 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1725 | send_vblank_event(dev, e, seq, &now); |
c9a9c5e0 KH |
1726 | } |
1727 | ||
cc1ef118 | 1728 | trace_drm_vblank_event(pipe, seq); |
c9a9c5e0 KH |
1729 | } |
1730 | ||
0a3e67a4 JB |
1731 | /** |
1732 | * drm_handle_vblank - handle a vblank event | |
1733 | * @dev: DRM device | |
cc1ef118 | 1734 | * @pipe: index of CRTC where this event occurred |
0a3e67a4 JB |
1735 | * |
1736 | * Drivers should call this routine in their vblank interrupt handlers to | |
1737 | * update the vblank counter and send any signals that may be pending. | |
115ebcd4 TR |
1738 | * |
1739 | * This is the legacy version of drm_crtc_handle_vblank(). | |
0a3e67a4 | 1740 | */ |
cc1ef118 | 1741 | bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe) |
0a3e67a4 | 1742 | { |
cc1ef118 | 1743 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
27641c3f MK |
1744 | unsigned long irqflags; |
1745 | ||
ee3c7795 | 1746 | if (WARN_ON_ONCE(!dev->num_crtcs)) |
78c6e170 | 1747 | return false; |
c9a9c5e0 | 1748 | |
cc1ef118 | 1749 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1750 | return false; |
1751 | ||
56cc279b VS |
1752 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1753 | ||
27641c3f MK |
1754 | /* Need timestamp lock to prevent concurrent execution with |
1755 | * vblank enable/disable, as this would cause inconsistent | |
1756 | * or corrupted timestamps and vblank counts. | |
1757 | */ | |
56cc279b | 1758 | spin_lock(&dev->vblank_time_lock); |
27641c3f MK |
1759 | |
1760 | /* Vblank irq handling disabled. Nothing to do. */ | |
8a51d5be | 1761 | if (!vblank->enabled) { |
56cc279b VS |
1762 | spin_unlock(&dev->vblank_time_lock); |
1763 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
78c6e170 | 1764 | return false; |
27641c3f MK |
1765 | } |
1766 | ||
4dfd6486 | 1767 | drm_update_vblank_count(dev, pipe, DRM_CALLED_FROM_VBLIRQ); |
27641c3f | 1768 | |
56cc279b VS |
1769 | spin_unlock(&dev->vblank_time_lock); |
1770 | ||
8a51d5be | 1771 | wake_up(&vblank->queue); |
cc1ef118 | 1772 | drm_handle_vblank_events(dev, pipe); |
27641c3f | 1773 | |
56cc279b VS |
1774 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
1775 | ||
78c6e170 | 1776 | return true; |
0a3e67a4 JB |
1777 | } |
1778 | EXPORT_SYMBOL(drm_handle_vblank); | |
115ebcd4 TR |
1779 | |
1780 | /** | |
1781 | * drm_crtc_handle_vblank - handle a vblank event | |
1782 | * @crtc: where this event occurred | |
1783 | * | |
1784 | * Drivers should call this routine in their vblank interrupt handlers to | |
1785 | * update the vblank counter and send any signals that may be pending. | |
1786 | * | |
1787 | * This is the native KMS version of drm_handle_vblank(). | |
1788 | * | |
1789 | * Returns: | |
1790 | * True if the event was successfully handled, false on failure. | |
1791 | */ | |
1792 | bool drm_crtc_handle_vblank(struct drm_crtc *crtc) | |
1793 | { | |
1794 | return drm_handle_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1795 | } | |
1796 | EXPORT_SYMBOL(drm_crtc_handle_vblank); | |
b44f8408 VS |
1797 | |
1798 | /** | |
1799 | * drm_vblank_no_hw_counter - "No hw counter" implementation of .get_vblank_counter() | |
1800 | * @dev: DRM device | |
1801 | * @pipe: CRTC for which to read the counter | |
1802 | * | |
1803 | * Drivers can plug this into the .get_vblank_counter() function if | |
1804 | * there is no useable hardware frame counter available. | |
1805 | * | |
1806 | * Returns: | |
1807 | * 0 | |
1808 | */ | |
1809 | u32 drm_vblank_no_hw_counter(struct drm_device *dev, unsigned int pipe) | |
1810 | { | |
cfc5adea | 1811 | WARN_ON_ONCE(dev->max_vblank_count != 0); |
b44f8408 VS |
1812 | return 0; |
1813 | } | |
1814 | EXPORT_SYMBOL(drm_vblank_no_hw_counter); |