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 | 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 | ||
af61d5ce ML |
237 | /** |
238 | * drm_accurate_vblank_count - retrieve the master vblank counter | |
239 | * @crtc: which counter to retrieve | |
240 | * | |
241 | * This function is similar to @drm_crtc_vblank_count but this | |
242 | * function interpolates to handle a race with vblank irq's. | |
243 | * | |
244 | * This is mostly useful for hardware that can obtain the scanout | |
245 | * position, but doesn't have a frame counter. | |
246 | */ | |
247 | u32 drm_accurate_vblank_count(struct drm_crtc *crtc) | |
248 | { | |
249 | struct drm_device *dev = crtc->dev; | |
250 | unsigned int pipe = drm_crtc_index(crtc); | |
251 | u32 vblank; | |
252 | unsigned long flags; | |
253 | ||
254 | WARN(!dev->driver->get_vblank_timestamp, | |
255 | "This function requires support for accurate vblank timestamps."); | |
256 | ||
257 | spin_lock_irqsave(&dev->vblank_time_lock, flags); | |
258 | ||
259 | drm_update_vblank_count(dev, pipe, 0); | |
260 | vblank = drm_vblank_count(dev, pipe); | |
261 | ||
262 | spin_unlock_irqrestore(&dev->vblank_time_lock, flags); | |
263 | ||
264 | return vblank; | |
265 | } | |
266 | EXPORT_SYMBOL(drm_accurate_vblank_count); | |
267 | ||
27641c3f MK |
268 | /* |
269 | * Disable vblank irq's on crtc, make sure that last vblank count | |
270 | * of hardware and corresponding consistent software vblank counter | |
271 | * are preserved, even if there are any spurious vblank irq's after | |
272 | * disable. | |
273 | */ | |
cc1ef118 | 274 | static void vblank_disable_and_save(struct drm_device *dev, unsigned int pipe) |
27641c3f | 275 | { |
cc1ef118 | 276 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
27641c3f | 277 | unsigned long irqflags; |
27641c3f MK |
278 | |
279 | /* Prevent vblank irq processing while disabling vblank irqs, | |
280 | * so no updates of timestamps or count can happen after we've | |
281 | * disabled. Needed to prevent races in case of delayed irq's. | |
27641c3f | 282 | */ |
27641c3f MK |
283 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); |
284 | ||
eb2ed66f LP |
285 | /* |
286 | * Only disable vblank interrupts if they're enabled. This avoids | |
287 | * calling the ->disable_vblank() operation in atomic context with the | |
288 | * hardware potentially runtime suspended. | |
289 | */ | |
290 | if (vblank->enabled) { | |
cc1ef118 | 291 | dev->driver->disable_vblank(dev, pipe); |
eb2ed66f LP |
292 | vblank->enabled = false; |
293 | } | |
27641c3f | 294 | |
4dfd6486 VS |
295 | /* |
296 | * Always update the count and timestamp to maintain the | |
297 | * appearance that the counter has been ticking all along until | |
298 | * this time. This makes the count account for the entire time | |
299 | * between drm_vblank_on() and drm_vblank_off(). | |
27641c3f | 300 | */ |
4dfd6486 | 301 | drm_update_vblank_count(dev, pipe, 0); |
27641c3f | 302 | |
27641c3f | 303 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); |
27641c3f MK |
304 | } |
305 | ||
0a3e67a4 JB |
306 | static void vblank_disable_fn(unsigned long arg) |
307 | { | |
e69595c2 VS |
308 | struct drm_vblank_crtc *vblank = (void *)arg; |
309 | struct drm_device *dev = vblank->dev; | |
cc1ef118 | 310 | unsigned int pipe = vblank->pipe; |
0a3e67a4 | 311 | unsigned long irqflags; |
0a3e67a4 | 312 | |
e69595c2 VS |
313 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
314 | if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) { | |
cc1ef118 TR |
315 | DRM_DEBUG("disabling vblank on crtc %u\n", pipe); |
316 | vblank_disable_and_save(dev, pipe); | |
0a3e67a4 | 317 | } |
e69595c2 | 318 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
0a3e67a4 JB |
319 | } |
320 | ||
f5752b38 DV |
321 | /** |
322 | * drm_vblank_cleanup - cleanup vblank support | |
323 | * @dev: DRM device | |
324 | * | |
325 | * This function cleans up any resources allocated in drm_vblank_init. | |
326 | */ | |
52440211 | 327 | void drm_vblank_cleanup(struct drm_device *dev) |
0a3e67a4 | 328 | { |
cc1ef118 | 329 | unsigned int pipe; |
e69595c2 | 330 | |
0a3e67a4 JB |
331 | /* Bail if the driver didn't call drm_vblank_init() */ |
332 | if (dev->num_crtcs == 0) | |
333 | return; | |
334 | ||
cc1ef118 TR |
335 | for (pipe = 0; pipe < dev->num_crtcs; pipe++) { |
336 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
8a51d5be | 337 | |
3bff93d6 DV |
338 | WARN_ON(vblank->enabled && |
339 | drm_core_check_feature(dev, DRIVER_MODESET)); | |
2368ffb1 | 340 | |
3bff93d6 | 341 | del_timer_sync(&vblank->disable_timer); |
e69595c2 | 342 | } |
0a3e67a4 | 343 | |
5380e929 | 344 | kfree(dev->vblank); |
0a3e67a4 JB |
345 | |
346 | dev->num_crtcs = 0; | |
347 | } | |
e77cef9c | 348 | EXPORT_SYMBOL(drm_vblank_cleanup); |
0a3e67a4 | 349 | |
f5752b38 DV |
350 | /** |
351 | * drm_vblank_init - initialize vblank support | |
cc1ef118 TR |
352 | * @dev: DRM device |
353 | * @num_crtcs: number of CRTCs supported by @dev | |
f5752b38 DV |
354 | * |
355 | * This function initializes vblank support for @num_crtcs display pipelines. | |
356 | * | |
357 | * Returns: | |
358 | * Zero on success or a negative error code on failure. | |
359 | */ | |
cc1ef118 | 360 | int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs) |
0a3e67a4 | 361 | { |
cc1ef118 TR |
362 | int ret = -ENOMEM; |
363 | unsigned int i; | |
0a3e67a4 | 364 | |
0a3e67a4 | 365 | spin_lock_init(&dev->vbl_lock); |
27641c3f MK |
366 | spin_lock_init(&dev->vblank_time_lock); |
367 | ||
0a3e67a4 JB |
368 | dev->num_crtcs = num_crtcs; |
369 | ||
5380e929 VS |
370 | dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL); |
371 | if (!dev->vblank) | |
0a3e67a4 JB |
372 | goto err; |
373 | ||
e69595c2 | 374 | for (i = 0; i < num_crtcs; i++) { |
8a51d5be VS |
375 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
376 | ||
377 | vblank->dev = dev; | |
cc1ef118 | 378 | vblank->pipe = i; |
8a51d5be VS |
379 | init_waitqueue_head(&vblank->queue); |
380 | setup_timer(&vblank->disable_timer, vblank_disable_fn, | |
381 | (unsigned long)vblank); | |
d4055a9b | 382 | seqlock_init(&vblank->seqlock); |
e69595c2 | 383 | } |
27641c3f | 384 | |
8f6fce03 | 385 | DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n"); |
27641c3f MK |
386 | |
387 | /* Driver specific high-precision vblank timestamping supported? */ | |
388 | if (dev->driver->get_vblank_timestamp) | |
389 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); | |
390 | else | |
391 | DRM_INFO("No driver support for vblank timestamp query.\n"); | |
392 | ||
5a8b21b2 MK |
393 | /* Must have precise timestamping for reliable vblank instant disable */ |
394 | if (dev->vblank_disable_immediate && !dev->driver->get_vblank_timestamp) { | |
395 | dev->vblank_disable_immediate = false; | |
396 | DRM_INFO("Setting vblank_disable_immediate to false because " | |
397 | "get_vblank_timestamp == NULL\n"); | |
398 | } | |
399 | ||
0a3e67a4 JB |
400 | return 0; |
401 | ||
402 | err: | |
79a093ae | 403 | dev->num_crtcs = 0; |
0a3e67a4 JB |
404 | return ret; |
405 | } | |
406 | EXPORT_SYMBOL(drm_vblank_init); | |
407 | ||
28d52043 DA |
408 | static void drm_irq_vgaarb_nokms(void *cookie, bool state) |
409 | { | |
410 | struct drm_device *dev = cookie; | |
411 | ||
412 | if (dev->driver->vgaarb_irq) { | |
413 | dev->driver->vgaarb_irq(dev, state); | |
414 | return; | |
415 | } | |
416 | ||
417 | if (!dev->irq_enabled) | |
418 | return; | |
419 | ||
5037f8ac JS |
420 | if (state) { |
421 | if (dev->driver->irq_uninstall) | |
422 | dev->driver->irq_uninstall(dev); | |
423 | } else { | |
424 | if (dev->driver->irq_preinstall) | |
425 | dev->driver->irq_preinstall(dev); | |
426 | if (dev->driver->irq_postinstall) | |
427 | dev->driver->irq_postinstall(dev); | |
28d52043 DA |
428 | } |
429 | } | |
430 | ||
1da177e4 | 431 | /** |
f5752b38 DV |
432 | * drm_irq_install - install IRQ handler |
433 | * @dev: DRM device | |
434 | * @irq: IRQ number to install the handler for | |
1da177e4 | 435 | * |
0a3e67a4 | 436 | * Initializes the IRQ related data. Installs the handler, calling the driver |
f5752b38 DV |
437 | * irq_preinstall() and irq_postinstall() functions before and after the |
438 | * installation. | |
439 | * | |
440 | * This is the simplified helper interface provided for drivers with no special | |
441 | * needs. Drivers which need to install interrupt handlers for multiple | |
442 | * interrupts must instead set drm_device->irq_enabled to signal the DRM core | |
443 | * that vblank interrupts are available. | |
444 | * | |
445 | * Returns: | |
446 | * Zero on success or a negative error code on failure. | |
1da177e4 | 447 | */ |
bb0f1b5c | 448 | int drm_irq_install(struct drm_device *dev, int irq) |
1da177e4 | 449 | { |
4a1b0714 | 450 | int ret; |
b5e89ed5 | 451 | unsigned long sh_flags = 0; |
1da177e4 LT |
452 | |
453 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
454 | return -EINVAL; | |
455 | ||
7c1a38e3 | 456 | if (irq == 0) |
1da177e4 LT |
457 | return -EINVAL; |
458 | ||
1da177e4 | 459 | /* Driver must have been initialized */ |
e090c53b | 460 | if (!dev->dev_private) |
1da177e4 | 461 | return -EINVAL; |
1da177e4 | 462 | |
e090c53b | 463 | if (dev->irq_enabled) |
1da177e4 | 464 | return -EBUSY; |
4423843c | 465 | dev->irq_enabled = true; |
1da177e4 | 466 | |
7c1a38e3 | 467 | DRM_DEBUG("irq=%d\n", irq); |
1da177e4 | 468 | |
b5e89ed5 | 469 | /* Before installing handler */ |
5037f8ac JS |
470 | if (dev->driver->irq_preinstall) |
471 | dev->driver->irq_preinstall(dev); | |
1da177e4 | 472 | |
b5e89ed5 | 473 | /* Install handler */ |
1da177e4 | 474 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
935f6e3a | 475 | sh_flags = IRQF_SHARED; |
b5e89ed5 | 476 | |
7c1a38e3 | 477 | ret = request_irq(irq, dev->driver->irq_handler, |
5829d183 | 478 | sh_flags, dev->driver->name, dev); |
9bfbd5cb | 479 | |
b5e89ed5 | 480 | if (ret < 0) { |
4423843c | 481 | dev->irq_enabled = false; |
1da177e4 LT |
482 | return ret; |
483 | } | |
484 | ||
fa538645 | 485 | if (drm_core_check_feature(dev, DRIVER_LEGACY)) |
28d52043 DA |
486 | vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL); |
487 | ||
b5e89ed5 | 488 | /* After installing handler */ |
5037f8ac JS |
489 | if (dev->driver->irq_postinstall) |
490 | ret = dev->driver->irq_postinstall(dev); | |
491 | ||
0a3e67a4 | 492 | if (ret < 0) { |
4423843c | 493 | dev->irq_enabled = false; |
fa538645 | 494 | if (drm_core_check_feature(dev, DRIVER_LEGACY)) |
e1c44acc | 495 | vga_client_register(dev->pdev, NULL, NULL, NULL); |
7c1a38e3 DV |
496 | free_irq(irq, dev); |
497 | } else { | |
498 | dev->irq = irq; | |
0a3e67a4 | 499 | } |
1da177e4 | 500 | |
0a3e67a4 | 501 | return ret; |
1da177e4 | 502 | } |
0a3e67a4 | 503 | EXPORT_SYMBOL(drm_irq_install); |
1da177e4 LT |
504 | |
505 | /** | |
f5752b38 DV |
506 | * drm_irq_uninstall - uninstall the IRQ handler |
507 | * @dev: DRM device | |
508 | * | |
509 | * Calls the driver's irq_uninstall() function and unregisters the IRQ handler. | |
510 | * This should only be called by drivers which used drm_irq_install() to set up | |
511 | * their interrupt handler. Other drivers must only reset | |
512 | * drm_device->irq_enabled to false. | |
1da177e4 | 513 | * |
f5752b38 DV |
514 | * Note that for kernel modesetting drivers it is a bug if this function fails. |
515 | * The sanity checks are only to catch buggy user modesetting drivers which call | |
516 | * the same function through an ioctl. | |
1da177e4 | 517 | * |
f5752b38 DV |
518 | * Returns: |
519 | * Zero on success or a negative error code on failure. | |
1da177e4 | 520 | */ |
27641c3f | 521 | int drm_irq_uninstall(struct drm_device *dev) |
1da177e4 | 522 | { |
dc1336ff | 523 | unsigned long irqflags; |
4423843c VS |
524 | bool irq_enabled; |
525 | int i; | |
1da177e4 LT |
526 | |
527 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
528 | return -EINVAL; | |
529 | ||
1da177e4 | 530 | irq_enabled = dev->irq_enabled; |
4423843c | 531 | dev->irq_enabled = false; |
1da177e4 | 532 | |
dc1336ff | 533 | /* |
3bff93d6 | 534 | * Wake up any waiters so they don't hang. This is just to paper over |
c78d1ca2 | 535 | * issues for UMS drivers which aren't in full control of their |
3bff93d6 DV |
536 | * vblank/irq handling. KMS drivers must ensure that vblanks are all |
537 | * disabled when uninstalling the irq handler. | |
dc1336ff | 538 | */ |
bde4889a BS |
539 | if (dev->num_crtcs) { |
540 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
541 | for (i = 0; i < dev->num_crtcs; i++) { | |
8a51d5be VS |
542 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
543 | ||
3bff93d6 DV |
544 | if (!vblank->enabled) |
545 | continue; | |
546 | ||
547 | WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET)); | |
548 | ||
549 | vblank_disable_and_save(dev, i); | |
8a51d5be | 550 | wake_up(&vblank->queue); |
bde4889a BS |
551 | } |
552 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
dc1336ff | 553 | } |
dc1336ff | 554 | |
b5e89ed5 | 555 | if (!irq_enabled) |
1da177e4 LT |
556 | return -EINVAL; |
557 | ||
7c1a38e3 | 558 | DRM_DEBUG("irq=%d\n", dev->irq); |
1da177e4 | 559 | |
fa538645 | 560 | if (drm_core_check_feature(dev, DRIVER_LEGACY)) |
28d52043 DA |
561 | vga_client_register(dev->pdev, NULL, NULL, NULL); |
562 | ||
5037f8ac JS |
563 | if (dev->driver->irq_uninstall) |
564 | dev->driver->irq_uninstall(dev); | |
1da177e4 | 565 | |
7c1a38e3 | 566 | free_irq(dev->irq, dev); |
1da177e4 LT |
567 | |
568 | return 0; | |
569 | } | |
570 | EXPORT_SYMBOL(drm_irq_uninstall); | |
571 | ||
f5752b38 | 572 | /* |
1da177e4 LT |
573 | * IRQ control ioctl. |
574 | * | |
575 | * \param inode device inode. | |
6c340eac | 576 | * \param file_priv DRM file private. |
1da177e4 LT |
577 | * \param cmd command. |
578 | * \param arg user argument, pointing to a drm_control structure. | |
579 | * \return zero on success or a negative number on failure. | |
580 | * | |
581 | * Calls irq_install() or irq_uninstall() according to \p arg. | |
582 | */ | |
c153f45f EA |
583 | int drm_control(struct drm_device *dev, void *data, |
584 | struct drm_file *file_priv) | |
1da177e4 | 585 | { |
c153f45f | 586 | struct drm_control *ctl = data; |
a319c1a4 | 587 | int ret = 0, irq; |
b5e89ed5 | 588 | |
27641c3f MK |
589 | /* if we haven't irq we fallback for compatibility reasons - |
590 | * this used to be a separate function in drm_dma.h | |
591 | */ | |
1da177e4 | 592 | |
22471cf6 DV |
593 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
594 | return 0; | |
fa538645 | 595 | if (!drm_core_check_feature(dev, DRIVER_LEGACY)) |
22471cf6 | 596 | return 0; |
c78d1ca2 | 597 | /* UMS was only ever supported on pci devices. */ |
22471cf6 DV |
598 | if (WARN_ON(!dev->pdev)) |
599 | return -EINVAL; | |
1da177e4 | 600 | |
c153f45f | 601 | switch (ctl->func) { |
1da177e4 | 602 | case DRM_INST_HANDLER: |
a319c1a4 DV |
603 | irq = dev->pdev->irq; |
604 | ||
1da177e4 | 605 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
a319c1a4 | 606 | ctl->irq != irq) |
1da177e4 | 607 | return -EINVAL; |
e090c53b | 608 | mutex_lock(&dev->struct_mutex); |
bb0f1b5c | 609 | ret = drm_irq_install(dev, irq); |
e090c53b DV |
610 | mutex_unlock(&dev->struct_mutex); |
611 | ||
612 | return ret; | |
1da177e4 | 613 | case DRM_UNINST_HANDLER: |
e090c53b DV |
614 | mutex_lock(&dev->struct_mutex); |
615 | ret = drm_irq_uninstall(dev); | |
616 | mutex_unlock(&dev->struct_mutex); | |
617 | ||
618 | return ret; | |
1da177e4 LT |
619 | default: |
620 | return -EINVAL; | |
621 | } | |
622 | } | |
623 | ||
27641c3f | 624 | /** |
f5752b38 DV |
625 | * drm_calc_timestamping_constants - calculate vblank timestamp constants |
626 | * @crtc: drm_crtc whose timestamp constants should be updated. | |
627 | * @mode: display mode containing the scanout timings | |
27641c3f | 628 | * |
21b21560 VS |
629 | * Calculate and store various constants which are later |
630 | * needed by vblank and swap-completion timestamping, e.g, | |
631 | * by drm_calc_vbltimestamp_from_scanoutpos(). They are | |
f5752b38 | 632 | * derived from CRTC's true scanout timing, so they take |
21b21560 | 633 | * things like panel scaling or other adjustments into account. |
27641c3f | 634 | */ |
545cdd55 VS |
635 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, |
636 | const struct drm_display_mode *mode) | |
27641c3f | 637 | { |
0c545ac4 VS |
638 | struct drm_device *dev = crtc->dev; |
639 | unsigned int pipe = drm_crtc_index(crtc); | |
640 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
20b20203 | 641 | int linedur_ns = 0, framedur_ns = 0; |
77666b72 | 642 | int dotclock = mode->crtc_clock; |
27641c3f | 643 | |
0c545ac4 VS |
644 | if (!dev->num_crtcs) |
645 | return; | |
646 | ||
647 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
648 | return; | |
649 | ||
27641c3f MK |
650 | /* Valid dotclock? */ |
651 | if (dotclock > 0) { | |
0dae35a3 VS |
652 | int frame_size = mode->crtc_htotal * mode->crtc_vtotal; |
653 | ||
654 | /* | |
655 | * Convert scanline length in pixels and video | |
20b20203 VS |
656 | * dot clock to line duration and frame duration |
657 | * in nanoseconds: | |
27641c3f | 658 | */ |
0dae35a3 VS |
659 | linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock); |
660 | framedur_ns = div_u64((u64) frame_size * 1000000, dotclock); | |
c0ae24c1 VS |
661 | |
662 | /* | |
663 | * Fields of interlaced scanout modes are only half a frame duration. | |
664 | */ | |
665 | if (mode->flags & DRM_MODE_FLAG_INTERLACE) | |
666 | framedur_ns /= 2; | |
27641c3f | 667 | } else |
cc1ef118 | 668 | DRM_ERROR("crtc %u: Can't calculate constants, dotclock = 0!\n", |
27641c3f MK |
669 | crtc->base.id); |
670 | ||
eba1f35d VS |
671 | vblank->linedur_ns = linedur_ns; |
672 | vblank->framedur_ns = framedur_ns; | |
27641c3f | 673 | |
cc1ef118 | 674 | DRM_DEBUG("crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n", |
545cdd55 VS |
675 | crtc->base.id, mode->crtc_htotal, |
676 | mode->crtc_vtotal, mode->crtc_vdisplay); | |
20b20203 VS |
677 | DRM_DEBUG("crtc %u: clock %d kHz framedur %d linedur %d\n", |
678 | crtc->base.id, dotclock, framedur_ns, linedur_ns); | |
27641c3f MK |
679 | } |
680 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
681 | ||
682 | /** | |
f5752b38 DV |
683 | * drm_calc_vbltimestamp_from_scanoutpos - precise vblank timestamp helper |
684 | * @dev: DRM device | |
cc1ef118 | 685 | * @pipe: index of CRTC whose vblank timestamp to retrieve |
f5752b38 DV |
686 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) |
687 | * On return contains true maximum error of timestamp | |
688 | * @vblank_time: Pointer to struct timeval which should receive the timestamp | |
689 | * @flags: Flags to pass to driver: | |
690 | * 0 = Default, | |
691 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
f5752b38 DV |
692 | * @mode: mode which defines the scanout timings |
693 | * | |
694 | * Implements calculation of exact vblank timestamps from given drm_display_mode | |
695 | * timings and current video scanout position of a CRTC. This can be called from | |
696 | * within get_vblank_timestamp() implementation of a kms driver to implement the | |
697 | * actual timestamping. | |
27641c3f MK |
698 | * |
699 | * Should return timestamps conforming to the OML_sync_control OpenML | |
700 | * extension specification. The timestamp corresponds to the end of | |
701 | * the vblank interval, aka start of scanout of topmost-leftmost display | |
702 | * pixel in the following video frame. | |
703 | * | |
704 | * Requires support for optional dev->driver->get_scanout_position() | |
705 | * in kms driver, plus a bit of setup code to provide a drm_display_mode | |
706 | * that corresponds to the true scanout timing. | |
707 | * | |
708 | * The current implementation only handles standard video modes. It | |
709 | * returns as no operation if a doublescan or interlaced video mode is | |
710 | * active. Higher level code is expected to handle this. | |
711 | * | |
f5752b38 DV |
712 | * Returns: |
713 | * Negative value on error, failure or if not supported in current | |
27641c3f MK |
714 | * video mode: |
715 | * | |
62cacc79 DV |
716 | * -EINVAL Invalid CRTC. |
717 | * -EAGAIN Temporary unavailable, e.g., called before initial modeset. | |
718 | * -ENOTSUPP Function not supported in current display mode. | |
719 | * -EIO Failed, e.g., due to failed scanout position query. | |
27641c3f MK |
720 | * |
721 | * Returns or'ed positive status flags on success: | |
722 | * | |
723 | * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping. | |
724 | * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval. | |
725 | * | |
726 | */ | |
cc1ef118 TR |
727 | int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, |
728 | unsigned int pipe, | |
27641c3f MK |
729 | int *max_error, |
730 | struct timeval *vblank_time, | |
731 | unsigned flags, | |
7da903ef | 732 | const struct drm_display_mode *mode) |
27641c3f | 733 | { |
e62f2f5a | 734 | struct timeval tv_etime; |
d2cb58c8 | 735 | ktime_t stime, etime; |
ad1716ec VS |
736 | unsigned int vbl_status; |
737 | int ret = DRM_VBLANKTIME_SCANOUTPOS_METHOD; | |
27641c3f | 738 | int vpos, hpos, i; |
3bb403bf | 739 | int delta_ns, duration_ns; |
27641c3f | 740 | |
cc1ef118 TR |
741 | if (pipe >= dev->num_crtcs) { |
742 | DRM_ERROR("Invalid crtc %u\n", pipe); | |
27641c3f MK |
743 | return -EINVAL; |
744 | } | |
745 | ||
746 | /* Scanout position query not supported? Should not happen. */ | |
747 | if (!dev->driver->get_scanout_position) { | |
748 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); | |
749 | return -EIO; | |
750 | } | |
751 | ||
27641c3f MK |
752 | /* If mode timing undefined, just return as no-op: |
753 | * Happens during initial modesetting of a crtc. | |
754 | */ | |
3bb403bf | 755 | if (mode->crtc_clock == 0) { |
cc1ef118 | 756 | DRM_DEBUG("crtc %u: Noop due to uninitialized mode.\n", pipe); |
27641c3f MK |
757 | return -EAGAIN; |
758 | } | |
759 | ||
27641c3f MK |
760 | /* Get current scanout position with system timestamp. |
761 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
762 | * if single query takes longer than max_error nanoseconds. | |
763 | * | |
764 | * This guarantees a tight bound on maximum error if | |
765 | * code gets preempted or delayed for some reason. | |
766 | */ | |
767 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
8f6fce03 MK |
768 | /* |
769 | * Get vertical and horizontal scanout position vpos, hpos, | |
770 | * and bounding timestamps stime, etime, pre/post query. | |
771 | */ | |
3bb403bf VS |
772 | vbl_status = dev->driver->get_scanout_position(dev, pipe, flags, |
773 | &vpos, &hpos, | |
774 | &stime, &etime, | |
775 | mode); | |
27641c3f | 776 | |
27641c3f MK |
777 | /* Return as no-op if scanout query unsupported or failed. */ |
778 | if (!(vbl_status & DRM_SCANOUTPOS_VALID)) { | |
ad1716ec | 779 | DRM_DEBUG("crtc %u : scanoutpos query failed [0x%x].\n", |
cc1ef118 | 780 | pipe, vbl_status); |
27641c3f MK |
781 | return -EIO; |
782 | } | |
783 | ||
8f6fce03 | 784 | /* Compute uncertainty in timestamp of scanout position query. */ |
e62f2f5a | 785 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); |
27641c3f MK |
786 | |
787 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
3c184f69 | 788 | if (duration_ns <= *max_error) |
27641c3f MK |
789 | break; |
790 | } | |
791 | ||
792 | /* Noisy system timing? */ | |
793 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
cc1ef118 TR |
794 | DRM_DEBUG("crtc %u: Noisy timestamp %d us > %d us [%d reps].\n", |
795 | pipe, duration_ns/1000, *max_error/1000, i); | |
27641c3f MK |
796 | } |
797 | ||
798 | /* Return upper bound of timestamp precision error. */ | |
3c184f69 | 799 | *max_error = duration_ns; |
27641c3f MK |
800 | |
801 | /* Check if in vblank area: | |
802 | * vpos is >=0 in video scanout area, but negative | |
803 | * within vblank area, counting down the number of lines until | |
804 | * start of scanout. | |
805 | */ | |
ad1716ec VS |
806 | if (vbl_status & DRM_SCANOUTPOS_IN_VBLANK) |
807 | ret |= DRM_VBLANKTIME_IN_VBLANK; | |
27641c3f MK |
808 | |
809 | /* Convert scanout position into elapsed time at raw_time query | |
810 | * since start of scanout at first display scanline. delta_ns | |
811 | * can be negative if start of scanout hasn't happened yet. | |
812 | */ | |
3bb403bf VS |
813 | delta_ns = div_s64(1000000LL * (vpos * mode->crtc_htotal + hpos), |
814 | mode->crtc_clock); | |
27641c3f | 815 | |
c61eef72 | 816 | if (!drm_timestamp_monotonic) |
d2cb58c8 | 817 | etime = ktime_mono_to_real(etime); |
c61eef72 | 818 | |
e62f2f5a ID |
819 | /* save this only for debugging purposes */ |
820 | tv_etime = ktime_to_timeval(etime); | |
27641c3f MK |
821 | /* Subtract time delta from raw timestamp to get final |
822 | * vblank_time timestamp for end of vblank. | |
823 | */ | |
a91d7b91 | 824 | etime = ktime_sub_ns(etime, delta_ns); |
e62f2f5a | 825 | *vblank_time = ktime_to_timeval(etime); |
27641c3f | 826 | |
235fabe0 VS |
827 | DRM_DEBUG_VBL("crtc %u : v 0x%x p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n", |
828 | pipe, vbl_status, hpos, vpos, | |
829 | (long)tv_etime.tv_sec, (long)tv_etime.tv_usec, | |
830 | (long)vblank_time->tv_sec, (long)vblank_time->tv_usec, | |
831 | duration_ns/1000, i); | |
27641c3f | 832 | |
ad1716ec | 833 | return ret; |
27641c3f MK |
834 | } |
835 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); | |
836 | ||
c61eef72 ID |
837 | static struct timeval get_drm_timestamp(void) |
838 | { | |
839 | ktime_t now; | |
840 | ||
d2cb58c8 | 841 | now = drm_timestamp_monotonic ? ktime_get() : ktime_get_real(); |
c61eef72 ID |
842 | return ktime_to_timeval(now); |
843 | } | |
844 | ||
27641c3f MK |
845 | /** |
846 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
4dfd909f | 847 | * vblank interval |
27641c3f | 848 | * @dev: DRM device |
cc1ef118 | 849 | * @pipe: index of CRTC whose vblank timestamp to retrieve |
27641c3f MK |
850 | * @tvblank: Pointer to target struct timeval which should receive the timestamp |
851 | * @flags: Flags to pass to driver: | |
f5752b38 DV |
852 | * 0 = Default, |
853 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
27641c3f MK |
854 | * |
855 | * Fetches the system timestamp corresponding to the time of the most recent | |
f5752b38 | 856 | * vblank interval on specified CRTC. May call into kms-driver to |
27641c3f MK |
857 | * compute the timestamp with a high-precision GPU specific method. |
858 | * | |
859 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
860 | * call, i.e., it isn't very precisely locked to the true vblank. | |
861 | * | |
f5752b38 | 862 | * Returns: |
fb446a1a | 863 | * True if timestamp is considered to be very precise, false otherwise. |
27641c3f | 864 | */ |
fb446a1a | 865 | static bool |
cc1ef118 | 866 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, |
fb446a1a | 867 | struct timeval *tvblank, unsigned flags) |
27641c3f | 868 | { |
4a1b0714 | 869 | int ret; |
27641c3f MK |
870 | |
871 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
872 | int max_error = (int) drm_timestamp_precision * 1000; | |
873 | ||
874 | /* Query driver if possible and precision timestamping enabled. */ | |
875 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) { | |
cc1ef118 | 876 | ret = dev->driver->get_vblank_timestamp(dev, pipe, &max_error, |
27641c3f MK |
877 | tvblank, flags); |
878 | if (ret > 0) | |
fb446a1a | 879 | return true; |
27641c3f MK |
880 | } |
881 | ||
882 | /* GPU high precision timestamp query unsupported or failed. | |
c61eef72 | 883 | * Return current monotonic/gettimeofday timestamp as best estimate. |
27641c3f | 884 | */ |
c61eef72 | 885 | *tvblank = get_drm_timestamp(); |
27641c3f | 886 | |
fb446a1a | 887 | return false; |
27641c3f | 888 | } |
27641c3f | 889 | |
0a3e67a4 JB |
890 | /** |
891 | * drm_vblank_count - retrieve "cooked" vblank counter value | |
892 | * @dev: DRM device | |
cc1ef118 | 893 | * @pipe: index of CRTC for which to retrieve the counter |
0a3e67a4 JB |
894 | * |
895 | * Fetches the "cooked" vblank count value that represents the number of | |
896 | * vblank events since the system was booted, including lost events due to | |
897 | * modesetting activity. | |
f5752b38 | 898 | * |
96d3f91e TR |
899 | * This is the legacy version of drm_crtc_vblank_count(). |
900 | * | |
f5752b38 DV |
901 | * Returns: |
902 | * The software vblank counter. | |
0a3e67a4 | 903 | */ |
88e72717 | 904 | u32 drm_vblank_count(struct drm_device *dev, unsigned int pipe) |
0a3e67a4 | 905 | { |
cc1ef118 | 906 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
8a51d5be | 907 | |
cc1ef118 | 908 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 | 909 | return 0; |
7d1de851 | 910 | |
99264a61 | 911 | return vblank->count; |
0a3e67a4 JB |
912 | } |
913 | EXPORT_SYMBOL(drm_vblank_count); | |
914 | ||
96d3f91e TR |
915 | /** |
916 | * drm_crtc_vblank_count - retrieve "cooked" vblank counter value | |
917 | * @crtc: which counter to retrieve | |
918 | * | |
919 | * Fetches the "cooked" vblank count value that represents the number of | |
920 | * vblank events since the system was booted, including lost events due to | |
921 | * modesetting activity. | |
922 | * | |
923 | * This is the native KMS version of drm_vblank_count(). | |
924 | * | |
925 | * Returns: | |
926 | * The software vblank counter. | |
927 | */ | |
928 | u32 drm_crtc_vblank_count(struct drm_crtc *crtc) | |
929 | { | |
930 | return drm_vblank_count(crtc->dev, drm_crtc_index(crtc)); | |
931 | } | |
932 | EXPORT_SYMBOL(drm_crtc_vblank_count); | |
933 | ||
27641c3f | 934 | /** |
cc1ef118 TR |
935 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value and the |
936 | * system timestamp corresponding to that vblank counter value. | |
27641c3f | 937 | * @dev: DRM device |
cc1ef118 | 938 | * @pipe: index of CRTC whose counter to retrieve |
27641c3f MK |
939 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. |
940 | * | |
941 | * Fetches the "cooked" vblank count value that represents the number of | |
942 | * vblank events since the system was booted, including lost events due to | |
943 | * modesetting activity. Returns corresponding system timestamp of the time | |
f5752b38 | 944 | * of the vblank interval that corresponds to the current vblank counter value. |
cf648305 TR |
945 | * |
946 | * This is the legacy version of drm_crtc_vblank_count_and_time(). | |
27641c3f | 947 | */ |
6e5f73fc GP |
948 | static u32 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe, |
949 | struct timeval *vblanktime) | |
27641c3f | 950 | { |
cc1ef118 | 951 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
d4055a9b MA |
952 | u32 vblank_count; |
953 | unsigned int seq; | |
27641c3f | 954 | |
cc1ef118 | 955 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
956 | return 0; |
957 | ||
27641c3f | 958 | do { |
d4055a9b MA |
959 | seq = read_seqbegin(&vblank->seqlock); |
960 | vblank_count = vblank->count; | |
961 | *vblanktime = vblank->time; | |
962 | } while (read_seqretry(&vblank->seqlock, seq)); | |
27641c3f | 963 | |
d4055a9b | 964 | return vblank_count; |
27641c3f | 965 | } |
27641c3f | 966 | |
cf648305 TR |
967 | /** |
968 | * drm_crtc_vblank_count_and_time - retrieve "cooked" vblank counter value | |
969 | * and the system timestamp corresponding to that vblank counter value | |
970 | * @crtc: which counter to retrieve | |
971 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. | |
972 | * | |
973 | * Fetches the "cooked" vblank count value that represents the number of | |
974 | * vblank events since the system was booted, including lost events due to | |
975 | * modesetting activity. Returns corresponding system timestamp of the time | |
976 | * of the vblank interval that corresponds to the current vblank counter value. | |
cf648305 TR |
977 | */ |
978 | u32 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc, | |
979 | struct timeval *vblanktime) | |
980 | { | |
981 | return drm_vblank_count_and_time(crtc->dev, drm_crtc_index(crtc), | |
982 | vblanktime); | |
983 | } | |
984 | EXPORT_SYMBOL(drm_crtc_vblank_count_and_time); | |
985 | ||
c6eefa17 RC |
986 | static void send_vblank_event(struct drm_device *dev, |
987 | struct drm_pending_vblank_event *e, | |
988 | unsigned long seq, struct timeval *now) | |
989 | { | |
c6eefa17 RC |
990 | e->event.sequence = seq; |
991 | e->event.tv_sec = now->tv_sec; | |
992 | e->event.tv_usec = now->tv_usec; | |
993 | ||
c6eefa17 RC |
994 | trace_drm_vblank_event_delivered(e->base.pid, e->pipe, |
995 | e->event.sequence); | |
c001da4f MA |
996 | |
997 | drm_send_event_locked(dev, &e->base); | |
c6eefa17 RC |
998 | } |
999 | ||
bbc8764f DV |
1000 | /** |
1001 | * drm_crtc_arm_vblank_event - arm vblank event after pageflip | |
1002 | * @crtc: the source CRTC of the vblank event | |
1003 | * @e: the event to send | |
1004 | * | |
1005 | * A lot of drivers need to generate vblank events for the very next vblank | |
1006 | * interrupt. For example when the page flip interrupt happens when the page | |
1007 | * flip gets armed, but not when it actually executes within the next vblank | |
1008 | * period. This helper function implements exactly the required vblank arming | |
1009 | * behaviour. | |
1010 | * | |
1011 | * Caller must hold event lock. Caller must also hold a vblank reference for | |
1012 | * the event @e, which will be dropped when the next vblank arrives. | |
bbc8764f DV |
1013 | */ |
1014 | void drm_crtc_arm_vblank_event(struct drm_crtc *crtc, | |
1015 | struct drm_pending_vblank_event *e) | |
1016 | { | |
93507d13 GP |
1017 | struct drm_device *dev = crtc->dev; |
1018 | unsigned int pipe = drm_crtc_index(crtc); | |
1019 | ||
1020 | assert_spin_locked(&dev->event_lock); | |
1021 | ||
1022 | e->pipe = pipe; | |
1023 | e->event.sequence = drm_vblank_count(dev, pipe); | |
1024 | list_add_tail(&e->base.link, &dev->vblank_event_list); | |
bbc8764f DV |
1025 | } |
1026 | EXPORT_SYMBOL(drm_crtc_arm_vblank_event); | |
1027 | ||
c6eefa17 | 1028 | /** |
db749b7e GP |
1029 | * drm_crtc_send_vblank_event - helper to send vblank event after pageflip |
1030 | * @crtc: the source CRTC of the vblank event | |
c6eefa17 RC |
1031 | * @e: the event to send |
1032 | * | |
1033 | * Updates sequence # and timestamp on event, and sends it to userspace. | |
1034 | * Caller must hold event lock. | |
1035 | */ | |
db749b7e GP |
1036 | void drm_crtc_send_vblank_event(struct drm_crtc *crtc, |
1037 | struct drm_pending_vblank_event *e) | |
c6eefa17 | 1038 | { |
db749b7e GP |
1039 | struct drm_device *dev = crtc->dev; |
1040 | unsigned int seq, pipe = drm_crtc_index(crtc); | |
c6eefa17 | 1041 | struct timeval now; |
4dfd909f | 1042 | |
2a7d3d6d | 1043 | if (dev->num_crtcs > 0) { |
cc1ef118 | 1044 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
c6eefa17 RC |
1045 | } else { |
1046 | seq = 0; | |
c61eef72 ID |
1047 | |
1048 | now = get_drm_timestamp(); | |
c6eefa17 | 1049 | } |
cc1ef118 | 1050 | e->pipe = pipe; |
c6eefa17 RC |
1051 | send_vblank_event(dev, e, seq, &now); |
1052 | } | |
a4d7b30d TR |
1053 | EXPORT_SYMBOL(drm_crtc_send_vblank_event); |
1054 | ||
f2752282 VS |
1055 | /** |
1056 | * drm_vblank_enable - enable the vblank interrupt on a CRTC | |
1057 | * @dev: DRM device | |
cc1ef118 | 1058 | * @pipe: CRTC index |
c30e11fc TR |
1059 | * |
1060 | * Returns: | |
1061 | * Zero on success or a negative error code on failure. | |
f2752282 | 1062 | */ |
cc1ef118 | 1063 | static int drm_vblank_enable(struct drm_device *dev, unsigned int pipe) |
f2752282 | 1064 | { |
cc1ef118 | 1065 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
f2752282 VS |
1066 | int ret = 0; |
1067 | ||
1068 | assert_spin_locked(&dev->vbl_lock); | |
1069 | ||
1070 | spin_lock(&dev->vblank_time_lock); | |
1071 | ||
8a51d5be | 1072 | if (!vblank->enabled) { |
1cfb80b1 DV |
1073 | /* |
1074 | * Enable vblank irqs under vblank_time_lock protection. | |
f2752282 VS |
1075 | * All vblank count & timestamp updates are held off |
1076 | * until we are done reinitializing master counter and | |
1077 | * timestamps. Filtercode in drm_handle_vblank() will | |
1078 | * prevent double-accounting of same vblank interval. | |
1079 | */ | |
cc1ef118 TR |
1080 | ret = dev->driver->enable_vblank(dev, pipe); |
1081 | DRM_DEBUG("enabling vblank on crtc %u, ret: %d\n", pipe, ret); | |
f2752282 | 1082 | if (ret) |
8a51d5be | 1083 | atomic_dec(&vblank->refcount); |
f2752282 | 1084 | else { |
8a51d5be | 1085 | vblank->enabled = true; |
a6e610dc | 1086 | drm_update_vblank_count(dev, pipe, 0); |
f2752282 VS |
1087 | } |
1088 | } | |
1089 | ||
1090 | spin_unlock(&dev->vblank_time_lock); | |
1091 | ||
1092 | return ret; | |
1093 | } | |
1094 | ||
0a3e67a4 JB |
1095 | /** |
1096 | * drm_vblank_get - get a reference count on vblank events | |
1097 | * @dev: DRM device | |
cc1ef118 | 1098 | * @pipe: index of CRTC to own |
0a3e67a4 JB |
1099 | * |
1100 | * Acquire a reference count on vblank events to avoid having them disabled | |
1101 | * while in use. | |
1102 | * | |
89dd6a4b DV |
1103 | * This is the legacy version of drm_crtc_vblank_get(). |
1104 | * | |
f5752b38 | 1105 | * Returns: |
c30e11fc | 1106 | * Zero on success or a negative error code on failure. |
0a3e67a4 | 1107 | */ |
ceb74152 | 1108 | static int drm_vblank_get(struct drm_device *dev, unsigned int pipe) |
0a3e67a4 | 1109 | { |
cc1ef118 | 1110 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
97cbc883 | 1111 | unsigned long irqflags; |
0a3e67a4 JB |
1112 | int ret = 0; |
1113 | ||
16e3247d GH |
1114 | if (!dev->num_crtcs) |
1115 | return -EINVAL; | |
1116 | ||
cc1ef118 | 1117 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1118 | return -EINVAL; |
1119 | ||
0a3e67a4 JB |
1120 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
1121 | /* Going from 0->1 means we have to enable interrupts again */ | |
8a51d5be | 1122 | if (atomic_add_return(1, &vblank->refcount) == 1) { |
cc1ef118 | 1123 | ret = drm_vblank_enable(dev, pipe); |
778c9026 | 1124 | } else { |
8a51d5be VS |
1125 | if (!vblank->enabled) { |
1126 | atomic_dec(&vblank->refcount); | |
778c9026 | 1127 | ret = -EINVAL; |
0a3e67a4 JB |
1128 | } |
1129 | } | |
1130 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1131 | ||
1132 | return ret; | |
1133 | } | |
0a3e67a4 | 1134 | |
89dd6a4b DV |
1135 | /** |
1136 | * drm_crtc_vblank_get - get a reference count on vblank events | |
1137 | * @crtc: which CRTC to own | |
1138 | * | |
1139 | * Acquire a reference count on vblank events to avoid having them disabled | |
1140 | * while in use. | |
1141 | * | |
89dd6a4b | 1142 | * Returns: |
c30e11fc | 1143 | * Zero on success or a negative error code on failure. |
89dd6a4b DV |
1144 | */ |
1145 | int drm_crtc_vblank_get(struct drm_crtc *crtc) | |
1146 | { | |
1147 | return drm_vblank_get(crtc->dev, drm_crtc_index(crtc)); | |
1148 | } | |
1149 | EXPORT_SYMBOL(drm_crtc_vblank_get); | |
1150 | ||
0a3e67a4 | 1151 | /** |
cc1ef118 | 1152 | * drm_vblank_put - release ownership of vblank events |
0a3e67a4 | 1153 | * @dev: DRM device |
cc1ef118 | 1154 | * @pipe: index of CRTC to release |
0a3e67a4 JB |
1155 | * |
1156 | * Release ownership of a given vblank counter, turning off interrupts | |
27641c3f | 1157 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. |
89dd6a4b DV |
1158 | * |
1159 | * This is the legacy version of drm_crtc_vblank_put(). | |
0a3e67a4 | 1160 | */ |
ceb74152 | 1161 | static void drm_vblank_put(struct drm_device *dev, unsigned int pipe) |
0a3e67a4 | 1162 | { |
cc1ef118 | 1163 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
8a51d5be | 1164 | |
cc1ef118 | 1165 | if (WARN_ON(pipe >= dev->num_crtcs)) |
7f907bf2 | 1166 | return; |
b3f5e732 | 1167 | |
7d1de851 | 1168 | if (WARN_ON(atomic_read(&vblank->refcount) == 0)) |
e6ae8687 RC |
1169 | return; |
1170 | ||
0a3e67a4 | 1171 | /* Last user schedules interrupt disable */ |
4ed0ce3d | 1172 | if (atomic_dec_and_test(&vblank->refcount)) { |
ab8905f1 DV |
1173 | if (drm_vblank_offdelay == 0) |
1174 | return; | |
1175 | else if (dev->vblank_disable_immediate || drm_vblank_offdelay < 0) | |
4ed0ce3d | 1176 | vblank_disable_fn((unsigned long)vblank); |
ab8905f1 | 1177 | else |
4ed0ce3d VS |
1178 | mod_timer(&vblank->disable_timer, |
1179 | jiffies + ((drm_vblank_offdelay * HZ)/1000)); | |
1180 | } | |
0a3e67a4 | 1181 | } |
0a3e67a4 | 1182 | |
89dd6a4b DV |
1183 | /** |
1184 | * drm_crtc_vblank_put - give up ownership of vblank events | |
1185 | * @crtc: which counter to give up | |
1186 | * | |
1187 | * Release ownership of a given vblank counter, turning off interrupts | |
1188 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. | |
89dd6a4b DV |
1189 | */ |
1190 | void drm_crtc_vblank_put(struct drm_crtc *crtc) | |
1191 | { | |
1192 | drm_vblank_put(crtc->dev, drm_crtc_index(crtc)); | |
1193 | } | |
1194 | EXPORT_SYMBOL(drm_crtc_vblank_put); | |
1195 | ||
e8450f51 DV |
1196 | /** |
1197 | * drm_wait_one_vblank - wait for one vblank | |
1198 | * @dev: DRM device | |
cc1ef118 | 1199 | * @pipe: CRTC index |
e8450f51 | 1200 | * |
1da248a5 VS |
1201 | * This waits for one vblank to pass on @pipe, using the irq driver interfaces. |
1202 | * It is a failure to call this when the vblank irq for @pipe is disabled, e.g. | |
e8450f51 DV |
1203 | * due to lack of driver support or because the crtc is off. |
1204 | */ | |
cc1ef118 | 1205 | void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe) |
e8450f51 | 1206 | { |
cc1ef118 | 1207 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
e8450f51 DV |
1208 | int ret; |
1209 | u32 last; | |
1210 | ||
cc1ef118 | 1211 | if (WARN_ON(pipe >= dev->num_crtcs)) |
7d1de851 TR |
1212 | return; |
1213 | ||
cc1ef118 TR |
1214 | ret = drm_vblank_get(dev, pipe); |
1215 | if (WARN(ret, "vblank not available on crtc %i, ret=%i\n", pipe, ret)) | |
e8450f51 DV |
1216 | return; |
1217 | ||
cc1ef118 | 1218 | last = drm_vblank_count(dev, pipe); |
e8450f51 | 1219 | |
cc1ef118 TR |
1220 | ret = wait_event_timeout(vblank->queue, |
1221 | last != drm_vblank_count(dev, pipe), | |
e8450f51 DV |
1222 | msecs_to_jiffies(100)); |
1223 | ||
cc1ef118 | 1224 | WARN(ret == 0, "vblank wait timed out on crtc %i\n", pipe); |
e8450f51 | 1225 | |
cc1ef118 | 1226 | drm_vblank_put(dev, pipe); |
e8450f51 DV |
1227 | } |
1228 | EXPORT_SYMBOL(drm_wait_one_vblank); | |
1229 | ||
1230 | /** | |
1231 | * drm_crtc_wait_one_vblank - wait for one vblank | |
1232 | * @crtc: DRM crtc | |
1233 | * | |
1234 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. | |
1235 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. | |
1236 | * due to lack of driver support or because the crtc is off. | |
1237 | */ | |
1238 | void drm_crtc_wait_one_vblank(struct drm_crtc *crtc) | |
1239 | { | |
1240 | drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1241 | } | |
1242 | EXPORT_SYMBOL(drm_crtc_wait_one_vblank); | |
1243 | ||
c6eefa17 RC |
1244 | /** |
1245 | * drm_vblank_off - disable vblank events on a CRTC | |
1246 | * @dev: DRM device | |
cc1ef118 | 1247 | * @pipe: CRTC index |
c6eefa17 | 1248 | * |
f5752b38 DV |
1249 | * Drivers can use this function to shut down the vblank interrupt handling when |
1250 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1251 | * stored so that drm_vblank_on() can restore it again. | |
1252 | * | |
1253 | * Drivers must use this function when the hardware vblank counter can get | |
1254 | * reset, e.g. when suspending. | |
89dd6a4b DV |
1255 | * |
1256 | * This is the legacy version of drm_crtc_vblank_off(). | |
c6eefa17 | 1257 | */ |
cc1ef118 | 1258 | void drm_vblank_off(struct drm_device *dev, unsigned int pipe) |
778c9026 | 1259 | { |
cc1ef118 | 1260 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
498548ec CJHR |
1261 | struct drm_pending_vblank_event *e, *t; |
1262 | struct timeval now; | |
778c9026 | 1263 | unsigned long irqflags; |
498548ec | 1264 | unsigned int seq; |
778c9026 | 1265 | |
cc1ef118 | 1266 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1267 | return; |
1268 | ||
56cc279b VS |
1269 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1270 | ||
1271 | spin_lock(&dev->vbl_lock); | |
e8235891 MK |
1272 | DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n", |
1273 | pipe, vblank->enabled, vblank->inmodeset); | |
1274 | ||
1275 | /* Avoid redundant vblank disables without previous drm_vblank_on(). */ | |
1276 | if (drm_core_check_feature(dev, DRIVER_ATOMIC) || !vblank->inmodeset) | |
1277 | vblank_disable_and_save(dev, pipe); | |
1278 | ||
8a51d5be | 1279 | wake_up(&vblank->queue); |
498548ec | 1280 | |
56cc279b VS |
1281 | /* |
1282 | * Prevent subsequent drm_vblank_get() from re-enabling | |
1283 | * the vblank interrupt by bumping the refcount. | |
1284 | */ | |
1285 | if (!vblank->inmodeset) { | |
1286 | atomic_inc(&vblank->refcount); | |
1287 | vblank->inmodeset = 1; | |
1288 | } | |
1289 | spin_unlock(&dev->vbl_lock); | |
1290 | ||
498548ec | 1291 | /* Send any queued vblank events, lest the natives grow disquiet */ |
cc1ef118 | 1292 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
e7783ba3 | 1293 | |
498548ec | 1294 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { |
cc1ef118 | 1295 | if (e->pipe != pipe) |
498548ec | 1296 | continue; |
44844892 | 1297 | DRM_DEBUG("Sending premature vblank event on disable: " |
1d776851 | 1298 | "wanted %u, current %u\n", |
498548ec | 1299 | e->event.sequence, seq); |
c6eefa17 | 1300 | list_del(&e->base.link); |
cc1ef118 | 1301 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1302 | send_vblank_event(dev, e, seq, &now); |
498548ec | 1303 | } |
56cc279b | 1304 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
778c9026 LP |
1305 | } |
1306 | EXPORT_SYMBOL(drm_vblank_off); | |
1307 | ||
89dd6a4b DV |
1308 | /** |
1309 | * drm_crtc_vblank_off - disable vblank events on a CRTC | |
1310 | * @crtc: CRTC in question | |
1311 | * | |
1312 | * Drivers can use this function to shut down the vblank interrupt handling when | |
1313 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1314 | * stored so that drm_vblank_on can restore it again. | |
1315 | * | |
1316 | * Drivers must use this function when the hardware vblank counter can get | |
1317 | * reset, e.g. when suspending. | |
1318 | * | |
1319 | * This is the native kms version of drm_vblank_off(). | |
1320 | */ | |
1321 | void drm_crtc_vblank_off(struct drm_crtc *crtc) | |
1322 | { | |
1323 | drm_vblank_off(crtc->dev, drm_crtc_index(crtc)); | |
1324 | } | |
1325 | EXPORT_SYMBOL(drm_crtc_vblank_off); | |
1326 | ||
9625604c DV |
1327 | /** |
1328 | * drm_crtc_vblank_reset - reset vblank state to off on a CRTC | |
2b193f02 | 1329 | * @crtc: CRTC in question |
9625604c DV |
1330 | * |
1331 | * Drivers can use this function to reset the vblank state to off at load time. | |
1332 | * Drivers should use this together with the drm_crtc_vblank_off() and | |
1333 | * drm_crtc_vblank_on() functions. The difference compared to | |
1334 | * drm_crtc_vblank_off() is that this function doesn't save the vblank counter | |
1335 | * and hence doesn't need to call any driver hooks. | |
1336 | */ | |
2b193f02 | 1337 | void drm_crtc_vblank_reset(struct drm_crtc *crtc) |
9625604c | 1338 | { |
2b193f02 | 1339 | struct drm_device *dev = crtc->dev; |
9625604c | 1340 | unsigned long irqflags; |
2b193f02 | 1341 | unsigned int pipe = drm_crtc_index(crtc); |
1da248a5 | 1342 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
9625604c DV |
1343 | |
1344 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1345 | /* | |
1346 | * Prevent subsequent drm_vblank_get() from enabling the vblank | |
1347 | * interrupt by bumping the refcount. | |
1348 | */ | |
1349 | if (!vblank->inmodeset) { | |
1350 | atomic_inc(&vblank->refcount); | |
1351 | vblank->inmodeset = 1; | |
1352 | } | |
1353 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1354 | ||
1355 | WARN_ON(!list_empty(&dev->vblank_event_list)); | |
1356 | } | |
1357 | EXPORT_SYMBOL(drm_crtc_vblank_reset); | |
1358 | ||
f2752282 VS |
1359 | /** |
1360 | * drm_vblank_on - enable vblank events on a CRTC | |
1361 | * @dev: DRM device | |
cc1ef118 | 1362 | * @pipe: CRTC index |
f5752b38 DV |
1363 | * |
1364 | * This functions restores the vblank interrupt state captured with | |
1365 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
32197aab | 1366 | * drm_vblank_off() can be unbalanced and so can also be unconditionally called |
f5752b38 | 1367 | * in driver load code to reflect the current hardware state of the crtc. |
89dd6a4b DV |
1368 | * |
1369 | * This is the legacy version of drm_crtc_vblank_on(). | |
f2752282 | 1370 | */ |
cc1ef118 | 1371 | void drm_vblank_on(struct drm_device *dev, unsigned int pipe) |
f2752282 | 1372 | { |
cc1ef118 | 1373 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
f2752282 VS |
1374 | unsigned long irqflags; |
1375 | ||
cc1ef118 | 1376 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1377 | return; |
1378 | ||
f2752282 | 1379 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
e8235891 MK |
1380 | DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n", |
1381 | pipe, vblank->enabled, vblank->inmodeset); | |
1382 | ||
7ffd7a68 | 1383 | /* Drop our private "prevent drm_vblank_get" refcount */ |
8a51d5be VS |
1384 | if (vblank->inmodeset) { |
1385 | atomic_dec(&vblank->refcount); | |
1386 | vblank->inmodeset = 0; | |
7ffd7a68 | 1387 | } |
f8ad028c | 1388 | |
4dfd6486 VS |
1389 | drm_reset_vblank_timestamp(dev, pipe); |
1390 | ||
cd19e52a VS |
1391 | /* |
1392 | * re-enable interrupts if there are users left, or the | |
1393 | * user wishes vblank interrupts to be enabled all the time. | |
1394 | */ | |
bb74fc1b | 1395 | if (atomic_read(&vblank->refcount) != 0 || drm_vblank_offdelay == 0) |
cc1ef118 | 1396 | WARN_ON(drm_vblank_enable(dev, pipe)); |
f2752282 VS |
1397 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
1398 | } | |
1399 | EXPORT_SYMBOL(drm_vblank_on); | |
1400 | ||
89dd6a4b DV |
1401 | /** |
1402 | * drm_crtc_vblank_on - enable vblank events on a CRTC | |
1403 | * @crtc: CRTC in question | |
1404 | * | |
1405 | * This functions restores the vblank interrupt state captured with | |
1406 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
32197aab | 1407 | * drm_vblank_off() can be unbalanced and so can also be unconditionally called |
89dd6a4b DV |
1408 | * in driver load code to reflect the current hardware state of the crtc. |
1409 | * | |
1410 | * This is the native kms version of drm_vblank_on(). | |
1411 | */ | |
1412 | void drm_crtc_vblank_on(struct drm_crtc *crtc) | |
1413 | { | |
1414 | drm_vblank_on(crtc->dev, drm_crtc_index(crtc)); | |
1415 | } | |
1416 | EXPORT_SYMBOL(drm_crtc_vblank_on); | |
1417 | ||
f453ba04 DA |
1418 | /** |
1419 | * drm_vblank_pre_modeset - account for vblanks across mode sets | |
1420 | * @dev: DRM device | |
cc1ef118 | 1421 | * @pipe: CRTC index |
f453ba04 DA |
1422 | * |
1423 | * Account for vblank events across mode setting events, which will likely | |
1424 | * reset the hardware frame counter. | |
f5752b38 DV |
1425 | * |
1426 | * This is done by grabbing a temporary vblank reference to ensure that the | |
1427 | * vblank interrupt keeps running across the modeset sequence. With this the | |
1428 | * software-side vblank frame counting will ensure that there are no jumps or | |
1429 | * discontinuities. | |
1430 | * | |
1431 | * Unfortunately this approach is racy and also doesn't work when the vblank | |
1432 | * interrupt stops running, e.g. across system suspend resume. It is therefore | |
1433 | * highly recommended that drivers use the newer drm_vblank_off() and | |
1434 | * drm_vblank_on() instead. drm_vblank_pre_modeset() only works correctly when | |
1435 | * using "cooked" software vblank frame counters and not relying on any hardware | |
1436 | * counters. | |
1437 | * | |
1438 | * Drivers must call drm_vblank_post_modeset() when re-enabling the same crtc | |
1439 | * again. | |
f453ba04 | 1440 | */ |
cc1ef118 | 1441 | void drm_vblank_pre_modeset(struct drm_device *dev, unsigned int pipe) |
f453ba04 | 1442 | { |
cc1ef118 | 1443 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
8a51d5be | 1444 | |
b7ea85a4 | 1445 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
e77cef9c JG |
1446 | if (!dev->num_crtcs) |
1447 | return; | |
e6ae8687 | 1448 | |
cc1ef118 | 1449 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1450 | return; |
1451 | ||
f453ba04 DA |
1452 | /* |
1453 | * To avoid all the problems that might happen if interrupts | |
1454 | * were enabled/disabled around or between these calls, we just | |
1455 | * have the kernel take a reference on the CRTC (just once though | |
1456 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
1457 | * so that interrupts remain enabled in the interim. | |
1458 | */ | |
8a51d5be VS |
1459 | if (!vblank->inmodeset) { |
1460 | vblank->inmodeset = 0x1; | |
cc1ef118 | 1461 | if (drm_vblank_get(dev, pipe) == 0) |
8a51d5be | 1462 | vblank->inmodeset |= 0x2; |
f453ba04 DA |
1463 | } |
1464 | } | |
1465 | EXPORT_SYMBOL(drm_vblank_pre_modeset); | |
1466 | ||
f5752b38 DV |
1467 | /** |
1468 | * drm_vblank_post_modeset - undo drm_vblank_pre_modeset changes | |
1469 | * @dev: DRM device | |
cc1ef118 | 1470 | * @pipe: CRTC index |
f5752b38 DV |
1471 | * |
1472 | * This function again drops the temporary vblank reference acquired in | |
1473 | * drm_vblank_pre_modeset. | |
1474 | */ | |
cc1ef118 | 1475 | void drm_vblank_post_modeset(struct drm_device *dev, unsigned int pipe) |
f453ba04 | 1476 | { |
cc1ef118 | 1477 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
f453ba04 DA |
1478 | unsigned long irqflags; |
1479 | ||
b7ea85a4 HC |
1480 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
1481 | if (!dev->num_crtcs) | |
1482 | return; | |
1483 | ||
cc1ef118 | 1484 | if (WARN_ON(pipe >= dev->num_crtcs)) |
7d1de851 TR |
1485 | return; |
1486 | ||
8a51d5be | 1487 | if (vblank->inmodeset) { |
f453ba04 | 1488 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
c61934ed | 1489 | drm_reset_vblank_timestamp(dev, pipe); |
f453ba04 | 1490 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
b3f5e732 | 1491 | |
8a51d5be | 1492 | if (vblank->inmodeset & 0x2) |
cc1ef118 | 1493 | drm_vblank_put(dev, pipe); |
b3f5e732 | 1494 | |
8a51d5be | 1495 | vblank->inmodeset = 0; |
f453ba04 DA |
1496 | } |
1497 | } | |
1498 | EXPORT_SYMBOL(drm_vblank_post_modeset); | |
1499 | ||
f5752b38 | 1500 | /* |
0a3e67a4 JB |
1501 | * drm_modeset_ctl - handle vblank event counter changes across mode switch |
1502 | * @DRM_IOCTL_ARGS: standard ioctl arguments | |
1503 | * | |
1504 | * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET | |
1505 | * ioctls around modesetting so that any lost vblank events are accounted for. | |
1506 | * | |
1507 | * Generally the counter will reset across mode sets. If interrupts are | |
1508 | * enabled around this call, we don't have to do anything since the counter | |
1509 | * will have already been incremented. | |
1510 | */ | |
1511 | int drm_modeset_ctl(struct drm_device *dev, void *data, | |
1512 | struct drm_file *file_priv) | |
1513 | { | |
1514 | struct drm_modeset_ctl *modeset = data; | |
cc1ef118 | 1515 | unsigned int pipe; |
0a3e67a4 JB |
1516 | |
1517 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
1518 | if (!dev->num_crtcs) | |
4a1b0714 | 1519 | return 0; |
0a3e67a4 | 1520 | |
29935554 | 1521 | /* KMS drivers handle this internally */ |
fa538645 | 1522 | if (!drm_core_check_feature(dev, DRIVER_LEGACY)) |
29935554 LP |
1523 | return 0; |
1524 | ||
cc1ef118 TR |
1525 | pipe = modeset->crtc; |
1526 | if (pipe >= dev->num_crtcs) | |
4a1b0714 | 1527 | return -EINVAL; |
0a3e67a4 | 1528 | |
0a3e67a4 JB |
1529 | switch (modeset->cmd) { |
1530 | case _DRM_PRE_MODESET: | |
cc1ef118 | 1531 | drm_vblank_pre_modeset(dev, pipe); |
0a3e67a4 JB |
1532 | break; |
1533 | case _DRM_POST_MODESET: | |
cc1ef118 | 1534 | drm_vblank_post_modeset(dev, pipe); |
0a3e67a4 JB |
1535 | break; |
1536 | default: | |
4a1b0714 | 1537 | return -EINVAL; |
0a3e67a4 JB |
1538 | } |
1539 | ||
4a1b0714 | 1540 | return 0; |
0a3e67a4 JB |
1541 | } |
1542 | ||
cc1ef118 | 1543 | static int drm_queue_vblank_event(struct drm_device *dev, unsigned int pipe, |
c9a9c5e0 KH |
1544 | union drm_wait_vblank *vblwait, |
1545 | struct drm_file *file_priv) | |
1546 | { | |
ffe7c73a | 1547 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
c9a9c5e0 KH |
1548 | struct drm_pending_vblank_event *e; |
1549 | struct timeval now; | |
1550 | unsigned long flags; | |
1551 | unsigned int seq; | |
ea5d552c | 1552 | int ret; |
c9a9c5e0 | 1553 | |
f76511b9 | 1554 | e = kzalloc(sizeof(*e), GFP_KERNEL); |
ea5d552c CW |
1555 | if (e == NULL) { |
1556 | ret = -ENOMEM; | |
1557 | goto err_put; | |
1558 | } | |
c9a9c5e0 KH |
1559 | |
1560 | e->pipe = pipe; | |
b9c2c9ae | 1561 | e->base.pid = current->pid; |
c9a9c5e0 | 1562 | e->event.base.type = DRM_EVENT_VBLANK; |
f76511b9 | 1563 | e->event.base.length = sizeof(e->event); |
c9a9c5e0 | 1564 | e->event.user_data = vblwait->request.signal; |
c9a9c5e0 | 1565 | |
c9a9c5e0 KH |
1566 | spin_lock_irqsave(&dev->event_lock, flags); |
1567 | ||
ffe7c73a VS |
1568 | /* |
1569 | * drm_vblank_off() might have been called after we called | |
1570 | * drm_vblank_get(). drm_vblank_off() holds event_lock | |
1571 | * around the vblank disable, so no need for further locking. | |
1572 | * The reference from drm_vblank_get() protects against | |
1573 | * vblank disable from another source. | |
1574 | */ | |
1575 | if (!vblank->enabled) { | |
1576 | ret = -EINVAL; | |
1577 | goto err_unlock; | |
1578 | } | |
1579 | ||
4020b220 DV |
1580 | ret = drm_event_reserve_init_locked(dev, file_priv, &e->base, |
1581 | &e->event.base); | |
1582 | ||
1583 | if (ret) | |
ea5d552c | 1584 | goto err_unlock; |
c9a9c5e0 | 1585 | |
27641c3f MK |
1586 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1587 | ||
1d776851 | 1588 | DRM_DEBUG("event on vblank count %u, current %u, crtc %u\n", |
c9a9c5e0 KH |
1589 | vblwait->request.sequence, seq, pipe); |
1590 | ||
b9c2c9ae JB |
1591 | trace_drm_vblank_event_queued(current->pid, pipe, |
1592 | vblwait->request.sequence); | |
1593 | ||
c9a9c5e0 KH |
1594 | e->event.sequence = vblwait->request.sequence; |
1595 | if ((seq - vblwait->request.sequence) <= (1 << 23)) { | |
6f331623 | 1596 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1597 | send_vblank_event(dev, e, seq, &now); |
000fa7cf | 1598 | vblwait->reply.sequence = seq; |
c9a9c5e0 | 1599 | } else { |
a6778e9e | 1600 | /* drm_handle_vblank_events will call drm_vblank_put */ |
c9a9c5e0 | 1601 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
000fa7cf | 1602 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1603 | } |
1604 | ||
1605 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1606 | ||
1607 | return 0; | |
ea5d552c CW |
1608 | |
1609 | err_unlock: | |
1610 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1611 | kfree(e); | |
1612 | err_put: | |
6f331623 | 1613 | drm_vblank_put(dev, pipe); |
ea5d552c | 1614 | return ret; |
c9a9c5e0 KH |
1615 | } |
1616 | ||
f5752b38 | 1617 | /* |
1da177e4 LT |
1618 | * Wait for VBLANK. |
1619 | * | |
1620 | * \param inode device inode. | |
6c340eac | 1621 | * \param file_priv DRM file private. |
1da177e4 LT |
1622 | * \param cmd command. |
1623 | * \param data user argument, pointing to a drm_wait_vblank structure. | |
1624 | * \return zero on success or a negative number on failure. | |
1625 | * | |
30b23634 EA |
1626 | * This function enables the vblank interrupt on the pipe requested, then |
1627 | * sleeps waiting for the requested sequence number to occur, and drops | |
f5752b38 | 1628 | * the vblank interrupt refcount afterwards. (vblank IRQ disable follows that |
30b23634 | 1629 | * after a timeout with no further vblank waits scheduled). |
1da177e4 | 1630 | */ |
0a3e67a4 JB |
1631 | int drm_wait_vblank(struct drm_device *dev, void *data, |
1632 | struct drm_file *file_priv) | |
1da177e4 | 1633 | { |
8a51d5be | 1634 | struct drm_vblank_crtc *vblank; |
c153f45f | 1635 | union drm_wait_vblank *vblwait = data; |
4a1b0714 | 1636 | int ret; |
cc1ef118 | 1637 | unsigned int flags, seq, pipe, high_pipe; |
1da177e4 | 1638 | |
4984979b DV |
1639 | if (!dev->irq_enabled) |
1640 | return -EINVAL; | |
1da177e4 | 1641 | |
30b23634 EA |
1642 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) |
1643 | return -EINVAL; | |
1644 | ||
c153f45f | 1645 | if (vblwait->request.type & |
19b01b5f IH |
1646 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1647 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
776c9443 | 1648 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", |
c153f45f | 1649 | vblwait->request.type, |
19b01b5f IH |
1650 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1651 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
776c9443 MCA |
1652 | return -EINVAL; |
1653 | } | |
1654 | ||
c153f45f | 1655 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
cc1ef118 TR |
1656 | high_pipe = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); |
1657 | if (high_pipe) | |
1658 | pipe = high_pipe >> _DRM_VBLANK_HIGH_CRTC_SHIFT; | |
19b01b5f | 1659 | else |
cc1ef118 TR |
1660 | pipe = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; |
1661 | if (pipe >= dev->num_crtcs) | |
776c9443 MCA |
1662 | return -EINVAL; |
1663 | ||
cc1ef118 | 1664 | vblank = &dev->vblank[pipe]; |
8a51d5be | 1665 | |
cc1ef118 | 1666 | ret = drm_vblank_get(dev, pipe); |
0a3e67a4 | 1667 | if (ret) { |
8d3457ec | 1668 | DRM_DEBUG("failed to acquire vblank counter, %d\n", ret); |
0a3e67a4 JB |
1669 | return ret; |
1670 | } | |
cc1ef118 | 1671 | seq = drm_vblank_count(dev, pipe); |
776c9443 | 1672 | |
c153f45f | 1673 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
1da177e4 | 1674 | case _DRM_VBLANK_RELATIVE: |
c153f45f EA |
1675 | vblwait->request.sequence += seq; |
1676 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |
1da177e4 LT |
1677 | case _DRM_VBLANK_ABSOLUTE: |
1678 | break; | |
1679 | default: | |
0a3e67a4 JB |
1680 | ret = -EINVAL; |
1681 | goto done; | |
1da177e4 LT |
1682 | } |
1683 | ||
97ef1ae0 MD |
1684 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
1685 | (seq - vblwait->request.sequence) <= (1 << 23)) { | |
1686 | vblwait->request.sequence = seq + 1; | |
1687 | } | |
1688 | ||
a6778e9e IH |
1689 | if (flags & _DRM_VBLANK_EVENT) { |
1690 | /* must hold on to the vblank ref until the event fires | |
1691 | * drm_vblank_put will be called asynchronously | |
1692 | */ | |
cc1ef118 | 1693 | return drm_queue_vblank_event(dev, pipe, vblwait, file_priv); |
a6778e9e | 1694 | } |
c9a9c5e0 | 1695 | |
1d776851 | 1696 | DRM_DEBUG("waiting on vblank count %u, crtc %u\n", |
cc1ef118 | 1697 | vblwait->request.sequence, pipe); |
8a51d5be | 1698 | DRM_WAIT_ON(ret, vblank->queue, 3 * HZ, |
cc1ef118 | 1699 | (((drm_vblank_count(dev, pipe) - |
30b23634 | 1700 | vblwait->request.sequence) <= (1 << 23)) || |
8a51d5be | 1701 | !vblank->enabled || |
30b23634 | 1702 | !dev->irq_enabled)); |
1da177e4 | 1703 | |
30b23634 EA |
1704 | if (ret != -EINTR) { |
1705 | struct timeval now; | |
1da177e4 | 1706 | |
cc1ef118 | 1707 | vblwait->reply.sequence = drm_vblank_count_and_time(dev, pipe, &now); |
30b23634 EA |
1708 | vblwait->reply.tval_sec = now.tv_sec; |
1709 | vblwait->reply.tval_usec = now.tv_usec; | |
27641c3f | 1710 | |
1d776851 | 1711 | DRM_DEBUG("returning %u to client\n", |
30b23634 | 1712 | vblwait->reply.sequence); |
1da177e4 | 1713 | } else { |
30b23634 | 1714 | DRM_DEBUG("vblank wait interrupted by signal\n"); |
1da177e4 LT |
1715 | } |
1716 | ||
0a3e67a4 | 1717 | done: |
cc1ef118 | 1718 | drm_vblank_put(dev, pipe); |
1da177e4 LT |
1719 | return ret; |
1720 | } | |
1721 | ||
cc1ef118 | 1722 | static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe) |
c9a9c5e0 KH |
1723 | { |
1724 | struct drm_pending_vblank_event *e, *t; | |
1725 | struct timeval now; | |
c9a9c5e0 KH |
1726 | unsigned int seq; |
1727 | ||
56cc279b | 1728 | assert_spin_locked(&dev->event_lock); |
c9a9c5e0 | 1729 | |
cc1ef118 | 1730 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
c9a9c5e0 KH |
1731 | |
1732 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
cc1ef118 | 1733 | if (e->pipe != pipe) |
c9a9c5e0 KH |
1734 | continue; |
1735 | if ((seq - e->event.sequence) > (1<<23)) | |
1736 | continue; | |
1737 | ||
1d776851 | 1738 | DRM_DEBUG("vblank event on %u, current %u\n", |
c9a9c5e0 KH |
1739 | e->event.sequence, seq); |
1740 | ||
c6eefa17 | 1741 | list_del(&e->base.link); |
cc1ef118 | 1742 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1743 | send_vblank_event(dev, e, seq, &now); |
c9a9c5e0 KH |
1744 | } |
1745 | ||
cc1ef118 | 1746 | trace_drm_vblank_event(pipe, seq); |
c9a9c5e0 KH |
1747 | } |
1748 | ||
0a3e67a4 JB |
1749 | /** |
1750 | * drm_handle_vblank - handle a vblank event | |
1751 | * @dev: DRM device | |
cc1ef118 | 1752 | * @pipe: index of CRTC where this event occurred |
0a3e67a4 JB |
1753 | * |
1754 | * Drivers should call this routine in their vblank interrupt handlers to | |
1755 | * update the vblank counter and send any signals that may be pending. | |
115ebcd4 TR |
1756 | * |
1757 | * This is the legacy version of drm_crtc_handle_vblank(). | |
0a3e67a4 | 1758 | */ |
cc1ef118 | 1759 | bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe) |
0a3e67a4 | 1760 | { |
cc1ef118 | 1761 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
27641c3f MK |
1762 | unsigned long irqflags; |
1763 | ||
ee3c7795 | 1764 | if (WARN_ON_ONCE(!dev->num_crtcs)) |
78c6e170 | 1765 | return false; |
c9a9c5e0 | 1766 | |
cc1ef118 | 1767 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1768 | return false; |
1769 | ||
56cc279b VS |
1770 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1771 | ||
27641c3f MK |
1772 | /* Need timestamp lock to prevent concurrent execution with |
1773 | * vblank enable/disable, as this would cause inconsistent | |
1774 | * or corrupted timestamps and vblank counts. | |
1775 | */ | |
56cc279b | 1776 | spin_lock(&dev->vblank_time_lock); |
27641c3f MK |
1777 | |
1778 | /* Vblank irq handling disabled. Nothing to do. */ | |
8a51d5be | 1779 | if (!vblank->enabled) { |
56cc279b VS |
1780 | spin_unlock(&dev->vblank_time_lock); |
1781 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
78c6e170 | 1782 | return false; |
27641c3f MK |
1783 | } |
1784 | ||
4dfd6486 | 1785 | drm_update_vblank_count(dev, pipe, DRM_CALLED_FROM_VBLIRQ); |
27641c3f | 1786 | |
56cc279b VS |
1787 | spin_unlock(&dev->vblank_time_lock); |
1788 | ||
8a51d5be | 1789 | wake_up(&vblank->queue); |
cc1ef118 | 1790 | drm_handle_vblank_events(dev, pipe); |
27641c3f | 1791 | |
56cc279b VS |
1792 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
1793 | ||
78c6e170 | 1794 | return true; |
0a3e67a4 JB |
1795 | } |
1796 | EXPORT_SYMBOL(drm_handle_vblank); | |
115ebcd4 TR |
1797 | |
1798 | /** | |
1799 | * drm_crtc_handle_vblank - handle a vblank event | |
1800 | * @crtc: where this event occurred | |
1801 | * | |
1802 | * Drivers should call this routine in their vblank interrupt handlers to | |
1803 | * update the vblank counter and send any signals that may be pending. | |
1804 | * | |
1805 | * This is the native KMS version of drm_handle_vblank(). | |
1806 | * | |
1807 | * Returns: | |
1808 | * True if the event was successfully handled, false on failure. | |
1809 | */ | |
1810 | bool drm_crtc_handle_vblank(struct drm_crtc *crtc) | |
1811 | { | |
1812 | return drm_handle_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1813 | } | |
1814 | EXPORT_SYMBOL(drm_crtc_handle_vblank); | |
b44f8408 VS |
1815 | |
1816 | /** | |
1817 | * drm_vblank_no_hw_counter - "No hw counter" implementation of .get_vblank_counter() | |
1818 | * @dev: DRM device | |
1819 | * @pipe: CRTC for which to read the counter | |
1820 | * | |
1821 | * Drivers can plug this into the .get_vblank_counter() function if | |
1822 | * there is no useable hardware frame counter available. | |
1823 | * | |
1824 | * Returns: | |
1825 | * 0 | |
1826 | */ | |
1827 | u32 drm_vblank_no_hw_counter(struct drm_device *dev, unsigned int pipe) | |
1828 | { | |
cfc5adea | 1829 | WARN_ON_ONCE(dev->max_vblank_count != 0); |
b44f8408 VS |
1830 | return 0; |
1831 | } | |
1832 | EXPORT_SYMBOL(drm_vblank_no_hw_counter); |