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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 MK |
44 | |
45 | /* Access macro for slots in vblank timestamp ringbuffer. */ | |
cc1ef118 TR |
46 | #define vblanktimestamp(dev, pipe, count) \ |
47 | ((dev)->vblank[pipe].time[(count) % DRM_VBLANKTIME_RBSIZE]) | |
27641c3f MK |
48 | |
49 | /* Retry timestamp calculation up to 3 times to satisfy | |
50 | * drm_timestamp_precision before giving up. | |
51 | */ | |
52 | #define DRM_TIMESTAMP_MAXRETRIES 3 | |
53 | ||
54 | /* Threshold in nanoseconds for detection of redundant | |
55 | * vblank irq in drm_handle_vblank(). 1 msec should be ok. | |
56 | */ | |
57 | #define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000 | |
58 | ||
fb446a1a | 59 | static bool |
cc1ef118 | 60 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, |
fb446a1a DV |
61 | struct timeval *tvblank, unsigned flags); |
62 | ||
18882995 DV |
63 | static unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */ |
64 | ||
65 | /* | |
66 | * Default to use monotonic timestamps for wait-for-vblank and page-flip | |
67 | * complete events. | |
68 | */ | |
69 | unsigned int drm_timestamp_monotonic = 1; | |
70 | ||
71 | static int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */ | |
72 | ||
73 | module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600); | |
74 | module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600); | |
75 | module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600); | |
76 | ||
1da248a5 | 77 | static void store_vblank(struct drm_device *dev, unsigned int pipe, |
209e4dbc | 78 | u32 vblank_count_inc, |
4dfd6486 | 79 | struct timeval *t_vblank, u32 last) |
99264a61 | 80 | { |
1da248a5 | 81 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
99264a61 DV |
82 | u32 tslot; |
83 | ||
84 | assert_spin_locked(&dev->vblank_time_lock); | |
85 | ||
4dfd6486 VS |
86 | vblank->last = last; |
87 | ||
1b2eb710 VS |
88 | /* All writers hold the spinlock, but readers are serialized by |
89 | * the latching of vblank->count below. | |
90 | */ | |
91 | tslot = vblank->count + vblank_count_inc; | |
92 | vblanktimestamp(dev, pipe, tslot) = *t_vblank; | |
99264a61 DV |
93 | |
94 | /* | |
95 | * vblank timestamp updates are protected on the write side with | |
96 | * vblank_time_lock, but on the read side done locklessly using a | |
97 | * sequence-lock on the vblank counter. Ensure correct ordering using | |
98 | * memory barrriers. We need the barrier both before and also after the | |
99 | * counter update to synchronize with the next timestamp write. | |
100 | * The read-side barriers for this are in drm_vblank_count_and_time. | |
101 | */ | |
102 | smp_wmb(); | |
103 | vblank->count += vblank_count_inc; | |
104 | smp_wmb(); | |
105 | } | |
106 | ||
4dfd6486 VS |
107 | /** |
108 | * drm_reset_vblank_timestamp - reset the last timestamp to the last vblank | |
109 | * @dev: DRM device | |
110 | * @pipe: index of CRTC for which to reset the timestamp | |
111 | * | |
112 | * Reset the stored timestamp for the current vblank count to correspond | |
113 | * to the last vblank occurred. | |
114 | * | |
115 | * Only to be called from drm_vblank_on(). | |
116 | * | |
117 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
118 | * device vblank fields. | |
119 | */ | |
120 | static void drm_reset_vblank_timestamp(struct drm_device *dev, unsigned int pipe) | |
121 | { | |
122 | u32 cur_vblank; | |
123 | bool rc; | |
124 | struct timeval t_vblank; | |
125 | int count = DRM_TIMESTAMP_MAXRETRIES; | |
126 | ||
127 | spin_lock(&dev->vblank_time_lock); | |
128 | ||
129 | /* | |
130 | * sample the current counter to avoid random jumps | |
131 | * when drm_vblank_enable() applies the diff | |
132 | */ | |
133 | do { | |
134 | cur_vblank = dev->driver->get_vblank_counter(dev, pipe); | |
135 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, 0); | |
136 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, pipe) && --count > 0); | |
137 | ||
138 | /* | |
139 | * Only reinitialize corresponding vblank timestamp if high-precision query | |
140 | * available and didn't fail. Otherwise reinitialize delayed at next vblank | |
141 | * interrupt and assign 0 for now, to mark the vblanktimestamp as invalid. | |
142 | */ | |
143 | if (!rc) | |
144 | t_vblank = (struct timeval) {0, 0}; | |
145 | ||
146 | /* | |
147 | * +1 to make sure user will never see the same | |
148 | * vblank counter value before and after a modeset | |
149 | */ | |
150 | store_vblank(dev, pipe, 1, &t_vblank, cur_vblank); | |
151 | ||
152 | spin_unlock(&dev->vblank_time_lock); | |
153 | } | |
154 | ||
13b030af VS |
155 | /** |
156 | * drm_update_vblank_count - update the master vblank counter | |
157 | * @dev: DRM device | |
cc1ef118 | 158 | * @pipe: counter to update |
13b030af VS |
159 | * |
160 | * Call back into the driver to update the appropriate vblank counter | |
1da248a5 | 161 | * (specified by @pipe). Deal with wraparound, if it occurred, and |
13b030af VS |
162 | * update the last read value so we can deal with wraparound on the next |
163 | * call if necessary. | |
164 | * | |
165 | * Only necessary when going from off->on, to account for frames we | |
166 | * didn't get an interrupt for. | |
167 | * | |
168 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
169 | * device vblank fields. | |
170 | */ | |
a6e610dc VS |
171 | static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe, |
172 | unsigned long flags) | |
13b030af | 173 | { |
cc1ef118 | 174 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
99264a61 | 175 | u32 cur_vblank, diff; |
fb446a1a | 176 | bool rc; |
13b030af | 177 | struct timeval t_vblank; |
facfb062 | 178 | int count = DRM_TIMESTAMP_MAXRETRIES; |
4dfd6486 | 179 | int framedur_ns = vblank->framedur_ns; |
13b030af VS |
180 | |
181 | /* | |
182 | * Interrupts were disabled prior to this call, so deal with counter | |
183 | * wrap if needed. | |
5ceecb2f | 184 | * NOTE! It's possible we lost a full dev->max_vblank_count + 1 events |
13b030af VS |
185 | * here if the register is small or we had vblank interrupts off for |
186 | * a long time. | |
187 | * | |
188 | * We repeat the hardware vblank counter & timestamp query until | |
189 | * we get consistent results. This to prevent races between gpu | |
190 | * updating its hardware counter while we are retrieving the | |
191 | * corresponding vblank timestamp. | |
192 | */ | |
193 | do { | |
cc1ef118 | 194 | cur_vblank = dev->driver->get_vblank_counter(dev, pipe); |
a6e610dc | 195 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, flags); |
facfb062 | 196 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, pipe) && --count > 0); |
13b030af | 197 | |
4dfd6486 VS |
198 | if (dev->max_vblank_count != 0) { |
199 | /* trust the hw counter when it's around */ | |
200 | diff = (cur_vblank - vblank->last) & dev->max_vblank_count; | |
201 | } else if (rc && framedur_ns) { | |
202 | const struct timeval *t_old; | |
203 | u64 diff_ns; | |
204 | ||
205 | t_old = &vblanktimestamp(dev, pipe, vblank->count); | |
206 | diff_ns = timeval_to_ns(&t_vblank) - timeval_to_ns(t_old); | |
13b030af | 207 | |
4dfd6486 VS |
208 | /* |
209 | * Figure out how many vblanks we've missed based | |
210 | * on the difference in the timestamps and the | |
211 | * frame/field duration. | |
212 | */ | |
213 | diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns); | |
214 | ||
215 | if (diff == 0 && flags & DRM_CALLED_FROM_VBLIRQ) | |
235fabe0 VS |
216 | DRM_DEBUG_VBL("crtc %u: Redundant vblirq ignored." |
217 | " diff_ns = %lld, framedur_ns = %d)\n", | |
218 | pipe, (long long) diff_ns, framedur_ns); | |
4dfd6486 VS |
219 | } else { |
220 | /* some kind of default for drivers w/o accurate vbl timestamping */ | |
221 | diff = (flags & DRM_CALLED_FROM_VBLIRQ) != 0; | |
13b030af VS |
222 | } |
223 | ||
235fabe0 VS |
224 | DRM_DEBUG_VBL("updating vblank count on crtc %u:" |
225 | " current=%u, diff=%u, hw=%u hw_last=%u\n", | |
226 | pipe, vblank->count, diff, cur_vblank, vblank->last); | |
13b030af | 227 | |
4dfd6486 VS |
228 | if (diff == 0) { |
229 | WARN_ON_ONCE(cur_vblank != vblank->last); | |
da8f4396 | 230 | return; |
4dfd6486 | 231 | } |
da8f4396 | 232 | |
99264a61 DV |
233 | /* |
234 | * Only reinitialize corresponding vblank timestamp if high-precision query | |
fa4270d8 VS |
235 | * available and didn't fail, or we were called from the vblank interrupt. |
236 | * Otherwise reinitialize delayed at next vblank interrupt and assign 0 | |
237 | * for now, to mark the vblanktimestamp as invalid. | |
13b030af | 238 | */ |
fa4270d8 | 239 | if (!rc && (flags & DRM_CALLED_FROM_VBLIRQ) == 0) |
d66a1e38 MK |
240 | t_vblank = (struct timeval) {0, 0}; |
241 | ||
4dfd6486 | 242 | store_vblank(dev, pipe, diff, &t_vblank, cur_vblank); |
13b030af VS |
243 | } |
244 | ||
27641c3f MK |
245 | /* |
246 | * Disable vblank irq's on crtc, make sure that last vblank count | |
247 | * of hardware and corresponding consistent software vblank counter | |
248 | * are preserved, even if there are any spurious vblank irq's after | |
249 | * disable. | |
250 | */ | |
cc1ef118 | 251 | static void vblank_disable_and_save(struct drm_device *dev, unsigned int pipe) |
27641c3f | 252 | { |
cc1ef118 | 253 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
27641c3f | 254 | unsigned long irqflags; |
27641c3f MK |
255 | |
256 | /* Prevent vblank irq processing while disabling vblank irqs, | |
257 | * so no updates of timestamps or count can happen after we've | |
258 | * disabled. Needed to prevent races in case of delayed irq's. | |
27641c3f | 259 | */ |
27641c3f MK |
260 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); |
261 | ||
eb2ed66f LP |
262 | /* |
263 | * Only disable vblank interrupts if they're enabled. This avoids | |
264 | * calling the ->disable_vblank() operation in atomic context with the | |
265 | * hardware potentially runtime suspended. | |
266 | */ | |
267 | if (vblank->enabled) { | |
cc1ef118 | 268 | dev->driver->disable_vblank(dev, pipe); |
eb2ed66f LP |
269 | vblank->enabled = false; |
270 | } | |
27641c3f | 271 | |
4dfd6486 VS |
272 | /* |
273 | * Always update the count and timestamp to maintain the | |
274 | * appearance that the counter has been ticking all along until | |
275 | * this time. This makes the count account for the entire time | |
276 | * between drm_vblank_on() and drm_vblank_off(). | |
27641c3f | 277 | */ |
4dfd6486 | 278 | drm_update_vblank_count(dev, pipe, 0); |
27641c3f | 279 | |
27641c3f | 280 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); |
27641c3f MK |
281 | } |
282 | ||
0a3e67a4 JB |
283 | static void vblank_disable_fn(unsigned long arg) |
284 | { | |
e69595c2 VS |
285 | struct drm_vblank_crtc *vblank = (void *)arg; |
286 | struct drm_device *dev = vblank->dev; | |
cc1ef118 | 287 | unsigned int pipe = vblank->pipe; |
0a3e67a4 | 288 | unsigned long irqflags; |
0a3e67a4 JB |
289 | |
290 | if (!dev->vblank_disable_allowed) | |
291 | return; | |
292 | ||
e69595c2 VS |
293 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
294 | if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) { | |
cc1ef118 TR |
295 | DRM_DEBUG("disabling vblank on crtc %u\n", pipe); |
296 | vblank_disable_and_save(dev, pipe); | |
0a3e67a4 | 297 | } |
e69595c2 | 298 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
0a3e67a4 JB |
299 | } |
300 | ||
f5752b38 DV |
301 | /** |
302 | * drm_vblank_cleanup - cleanup vblank support | |
303 | * @dev: DRM device | |
304 | * | |
305 | * This function cleans up any resources allocated in drm_vblank_init. | |
306 | */ | |
52440211 | 307 | void drm_vblank_cleanup(struct drm_device *dev) |
0a3e67a4 | 308 | { |
cc1ef118 | 309 | unsigned int pipe; |
e69595c2 | 310 | |
0a3e67a4 JB |
311 | /* Bail if the driver didn't call drm_vblank_init() */ |
312 | if (dev->num_crtcs == 0) | |
313 | return; | |
314 | ||
cc1ef118 TR |
315 | for (pipe = 0; pipe < dev->num_crtcs; pipe++) { |
316 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
8a51d5be | 317 | |
3bff93d6 DV |
318 | WARN_ON(vblank->enabled && |
319 | drm_core_check_feature(dev, DRIVER_MODESET)); | |
2368ffb1 | 320 | |
3bff93d6 | 321 | del_timer_sync(&vblank->disable_timer); |
e69595c2 | 322 | } |
0a3e67a4 | 323 | |
5380e929 | 324 | kfree(dev->vblank); |
0a3e67a4 JB |
325 | |
326 | dev->num_crtcs = 0; | |
327 | } | |
e77cef9c | 328 | EXPORT_SYMBOL(drm_vblank_cleanup); |
0a3e67a4 | 329 | |
f5752b38 DV |
330 | /** |
331 | * drm_vblank_init - initialize vblank support | |
cc1ef118 TR |
332 | * @dev: DRM device |
333 | * @num_crtcs: number of CRTCs supported by @dev | |
f5752b38 DV |
334 | * |
335 | * This function initializes vblank support for @num_crtcs display pipelines. | |
336 | * | |
337 | * Returns: | |
338 | * Zero on success or a negative error code on failure. | |
339 | */ | |
cc1ef118 | 340 | int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs) |
0a3e67a4 | 341 | { |
cc1ef118 TR |
342 | int ret = -ENOMEM; |
343 | unsigned int i; | |
0a3e67a4 | 344 | |
0a3e67a4 | 345 | spin_lock_init(&dev->vbl_lock); |
27641c3f MK |
346 | spin_lock_init(&dev->vblank_time_lock); |
347 | ||
0a3e67a4 JB |
348 | dev->num_crtcs = num_crtcs; |
349 | ||
5380e929 VS |
350 | dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL); |
351 | if (!dev->vblank) | |
0a3e67a4 JB |
352 | goto err; |
353 | ||
e69595c2 | 354 | for (i = 0; i < num_crtcs; i++) { |
8a51d5be VS |
355 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
356 | ||
357 | vblank->dev = dev; | |
cc1ef118 | 358 | vblank->pipe = i; |
8a51d5be VS |
359 | init_waitqueue_head(&vblank->queue); |
360 | setup_timer(&vblank->disable_timer, vblank_disable_fn, | |
361 | (unsigned long)vblank); | |
e69595c2 | 362 | } |
27641c3f | 363 | |
8f6fce03 | 364 | DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n"); |
27641c3f MK |
365 | |
366 | /* Driver specific high-precision vblank timestamping supported? */ | |
367 | if (dev->driver->get_vblank_timestamp) | |
368 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); | |
369 | else | |
370 | DRM_INFO("No driver support for vblank timestamp query.\n"); | |
371 | ||
5a8b21b2 MK |
372 | /* Must have precise timestamping for reliable vblank instant disable */ |
373 | if (dev->vblank_disable_immediate && !dev->driver->get_vblank_timestamp) { | |
374 | dev->vblank_disable_immediate = false; | |
375 | DRM_INFO("Setting vblank_disable_immediate to false because " | |
376 | "get_vblank_timestamp == NULL\n"); | |
377 | } | |
378 | ||
ba0bf120 VS |
379 | dev->vblank_disable_allowed = false; |
380 | ||
0a3e67a4 JB |
381 | return 0; |
382 | ||
383 | err: | |
79a093ae | 384 | dev->num_crtcs = 0; |
0a3e67a4 JB |
385 | return ret; |
386 | } | |
387 | EXPORT_SYMBOL(drm_vblank_init); | |
388 | ||
28d52043 DA |
389 | static void drm_irq_vgaarb_nokms(void *cookie, bool state) |
390 | { | |
391 | struct drm_device *dev = cookie; | |
392 | ||
393 | if (dev->driver->vgaarb_irq) { | |
394 | dev->driver->vgaarb_irq(dev, state); | |
395 | return; | |
396 | } | |
397 | ||
398 | if (!dev->irq_enabled) | |
399 | return; | |
400 | ||
5037f8ac JS |
401 | if (state) { |
402 | if (dev->driver->irq_uninstall) | |
403 | dev->driver->irq_uninstall(dev); | |
404 | } else { | |
405 | if (dev->driver->irq_preinstall) | |
406 | dev->driver->irq_preinstall(dev); | |
407 | if (dev->driver->irq_postinstall) | |
408 | dev->driver->irq_postinstall(dev); | |
28d52043 DA |
409 | } |
410 | } | |
411 | ||
1da177e4 | 412 | /** |
f5752b38 DV |
413 | * drm_irq_install - install IRQ handler |
414 | * @dev: DRM device | |
415 | * @irq: IRQ number to install the handler for | |
1da177e4 | 416 | * |
0a3e67a4 | 417 | * Initializes the IRQ related data. Installs the handler, calling the driver |
f5752b38 DV |
418 | * irq_preinstall() and irq_postinstall() functions before and after the |
419 | * installation. | |
420 | * | |
421 | * This is the simplified helper interface provided for drivers with no special | |
422 | * needs. Drivers which need to install interrupt handlers for multiple | |
423 | * interrupts must instead set drm_device->irq_enabled to signal the DRM core | |
424 | * that vblank interrupts are available. | |
425 | * | |
426 | * Returns: | |
427 | * Zero on success or a negative error code on failure. | |
1da177e4 | 428 | */ |
bb0f1b5c | 429 | int drm_irq_install(struct drm_device *dev, int irq) |
1da177e4 | 430 | { |
4a1b0714 | 431 | int ret; |
b5e89ed5 | 432 | unsigned long sh_flags = 0; |
1da177e4 LT |
433 | |
434 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
435 | return -EINVAL; | |
436 | ||
7c1a38e3 | 437 | if (irq == 0) |
1da177e4 LT |
438 | return -EINVAL; |
439 | ||
1da177e4 | 440 | /* Driver must have been initialized */ |
e090c53b | 441 | if (!dev->dev_private) |
1da177e4 | 442 | return -EINVAL; |
1da177e4 | 443 | |
e090c53b | 444 | if (dev->irq_enabled) |
1da177e4 | 445 | return -EBUSY; |
4423843c | 446 | dev->irq_enabled = true; |
1da177e4 | 447 | |
7c1a38e3 | 448 | DRM_DEBUG("irq=%d\n", irq); |
1da177e4 | 449 | |
b5e89ed5 | 450 | /* Before installing handler */ |
5037f8ac JS |
451 | if (dev->driver->irq_preinstall) |
452 | dev->driver->irq_preinstall(dev); | |
1da177e4 | 453 | |
b5e89ed5 | 454 | /* Install handler */ |
1da177e4 | 455 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
935f6e3a | 456 | sh_flags = IRQF_SHARED; |
b5e89ed5 | 457 | |
7c1a38e3 | 458 | ret = request_irq(irq, dev->driver->irq_handler, |
5829d183 | 459 | sh_flags, dev->driver->name, dev); |
9bfbd5cb | 460 | |
b5e89ed5 | 461 | if (ret < 0) { |
4423843c | 462 | dev->irq_enabled = false; |
1da177e4 LT |
463 | return ret; |
464 | } | |
465 | ||
28d52043 DA |
466 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
467 | vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL); | |
468 | ||
b5e89ed5 | 469 | /* After installing handler */ |
5037f8ac JS |
470 | if (dev->driver->irq_postinstall) |
471 | ret = dev->driver->irq_postinstall(dev); | |
472 | ||
0a3e67a4 | 473 | if (ret < 0) { |
4423843c | 474 | dev->irq_enabled = false; |
e1c44acc JS |
475 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
476 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
7c1a38e3 DV |
477 | free_irq(irq, dev); |
478 | } else { | |
479 | dev->irq = irq; | |
0a3e67a4 | 480 | } |
1da177e4 | 481 | |
0a3e67a4 | 482 | return ret; |
1da177e4 | 483 | } |
0a3e67a4 | 484 | EXPORT_SYMBOL(drm_irq_install); |
1da177e4 LT |
485 | |
486 | /** | |
f5752b38 DV |
487 | * drm_irq_uninstall - uninstall the IRQ handler |
488 | * @dev: DRM device | |
489 | * | |
490 | * Calls the driver's irq_uninstall() function and unregisters the IRQ handler. | |
491 | * This should only be called by drivers which used drm_irq_install() to set up | |
492 | * their interrupt handler. Other drivers must only reset | |
493 | * drm_device->irq_enabled to false. | |
1da177e4 | 494 | * |
f5752b38 DV |
495 | * Note that for kernel modesetting drivers it is a bug if this function fails. |
496 | * The sanity checks are only to catch buggy user modesetting drivers which call | |
497 | * the same function through an ioctl. | |
1da177e4 | 498 | * |
f5752b38 DV |
499 | * Returns: |
500 | * Zero on success or a negative error code on failure. | |
1da177e4 | 501 | */ |
27641c3f | 502 | int drm_irq_uninstall(struct drm_device *dev) |
1da177e4 | 503 | { |
dc1336ff | 504 | unsigned long irqflags; |
4423843c VS |
505 | bool irq_enabled; |
506 | int i; | |
1da177e4 LT |
507 | |
508 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
509 | return -EINVAL; | |
510 | ||
1da177e4 | 511 | irq_enabled = dev->irq_enabled; |
4423843c | 512 | dev->irq_enabled = false; |
1da177e4 | 513 | |
dc1336ff | 514 | /* |
3bff93d6 DV |
515 | * Wake up any waiters so they don't hang. This is just to paper over |
516 | * isssues for UMS drivers which aren't in full control of their | |
517 | * vblank/irq handling. KMS drivers must ensure that vblanks are all | |
518 | * disabled when uninstalling the irq handler. | |
dc1336ff | 519 | */ |
bde4889a BS |
520 | if (dev->num_crtcs) { |
521 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
522 | for (i = 0; i < dev->num_crtcs; i++) { | |
8a51d5be VS |
523 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
524 | ||
3bff93d6 DV |
525 | if (!vblank->enabled) |
526 | continue; | |
527 | ||
528 | WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET)); | |
529 | ||
530 | vblank_disable_and_save(dev, i); | |
8a51d5be | 531 | wake_up(&vblank->queue); |
bde4889a BS |
532 | } |
533 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
dc1336ff | 534 | } |
dc1336ff | 535 | |
b5e89ed5 | 536 | if (!irq_enabled) |
1da177e4 LT |
537 | return -EINVAL; |
538 | ||
7c1a38e3 | 539 | DRM_DEBUG("irq=%d\n", dev->irq); |
1da177e4 | 540 | |
28d52043 DA |
541 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
542 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
543 | ||
5037f8ac JS |
544 | if (dev->driver->irq_uninstall) |
545 | dev->driver->irq_uninstall(dev); | |
1da177e4 | 546 | |
7c1a38e3 | 547 | free_irq(dev->irq, dev); |
1da177e4 LT |
548 | |
549 | return 0; | |
550 | } | |
551 | EXPORT_SYMBOL(drm_irq_uninstall); | |
552 | ||
f5752b38 | 553 | /* |
1da177e4 LT |
554 | * IRQ control ioctl. |
555 | * | |
556 | * \param inode device inode. | |
6c340eac | 557 | * \param file_priv DRM file private. |
1da177e4 LT |
558 | * \param cmd command. |
559 | * \param arg user argument, pointing to a drm_control structure. | |
560 | * \return zero on success or a negative number on failure. | |
561 | * | |
562 | * Calls irq_install() or irq_uninstall() according to \p arg. | |
563 | */ | |
c153f45f EA |
564 | int drm_control(struct drm_device *dev, void *data, |
565 | struct drm_file *file_priv) | |
1da177e4 | 566 | { |
c153f45f | 567 | struct drm_control *ctl = data; |
a319c1a4 | 568 | int ret = 0, irq; |
b5e89ed5 | 569 | |
27641c3f MK |
570 | /* if we haven't irq we fallback for compatibility reasons - |
571 | * this used to be a separate function in drm_dma.h | |
572 | */ | |
1da177e4 | 573 | |
22471cf6 DV |
574 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
575 | return 0; | |
576 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
577 | return 0; | |
578 | /* UMS was only ever support on pci devices. */ | |
579 | if (WARN_ON(!dev->pdev)) | |
580 | return -EINVAL; | |
1da177e4 | 581 | |
c153f45f | 582 | switch (ctl->func) { |
1da177e4 | 583 | case DRM_INST_HANDLER: |
a319c1a4 DV |
584 | irq = dev->pdev->irq; |
585 | ||
1da177e4 | 586 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
a319c1a4 | 587 | ctl->irq != irq) |
1da177e4 | 588 | return -EINVAL; |
e090c53b | 589 | mutex_lock(&dev->struct_mutex); |
bb0f1b5c | 590 | ret = drm_irq_install(dev, irq); |
e090c53b DV |
591 | mutex_unlock(&dev->struct_mutex); |
592 | ||
593 | return ret; | |
1da177e4 | 594 | case DRM_UNINST_HANDLER: |
e090c53b DV |
595 | mutex_lock(&dev->struct_mutex); |
596 | ret = drm_irq_uninstall(dev); | |
597 | mutex_unlock(&dev->struct_mutex); | |
598 | ||
599 | return ret; | |
1da177e4 LT |
600 | default: |
601 | return -EINVAL; | |
602 | } | |
603 | } | |
604 | ||
27641c3f | 605 | /** |
f5752b38 DV |
606 | * drm_calc_timestamping_constants - calculate vblank timestamp constants |
607 | * @crtc: drm_crtc whose timestamp constants should be updated. | |
608 | * @mode: display mode containing the scanout timings | |
27641c3f | 609 | * |
21b21560 VS |
610 | * Calculate and store various constants which are later |
611 | * needed by vblank and swap-completion timestamping, e.g, | |
612 | * by drm_calc_vbltimestamp_from_scanoutpos(). They are | |
f5752b38 | 613 | * derived from CRTC's true scanout timing, so they take |
21b21560 | 614 | * things like panel scaling or other adjustments into account. |
27641c3f | 615 | */ |
545cdd55 VS |
616 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, |
617 | const struct drm_display_mode *mode) | |
27641c3f | 618 | { |
0c545ac4 VS |
619 | struct drm_device *dev = crtc->dev; |
620 | unsigned int pipe = drm_crtc_index(crtc); | |
621 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
20b20203 | 622 | int linedur_ns = 0, framedur_ns = 0; |
77666b72 | 623 | int dotclock = mode->crtc_clock; |
27641c3f | 624 | |
0c545ac4 VS |
625 | if (!dev->num_crtcs) |
626 | return; | |
627 | ||
628 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
629 | return; | |
630 | ||
27641c3f MK |
631 | /* Valid dotclock? */ |
632 | if (dotclock > 0) { | |
0dae35a3 VS |
633 | int frame_size = mode->crtc_htotal * mode->crtc_vtotal; |
634 | ||
635 | /* | |
636 | * Convert scanline length in pixels and video | |
20b20203 VS |
637 | * dot clock to line duration and frame duration |
638 | * in nanoseconds: | |
27641c3f | 639 | */ |
0dae35a3 VS |
640 | linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock); |
641 | framedur_ns = div_u64((u64) frame_size * 1000000, dotclock); | |
c0ae24c1 VS |
642 | |
643 | /* | |
644 | * Fields of interlaced scanout modes are only half a frame duration. | |
645 | */ | |
646 | if (mode->flags & DRM_MODE_FLAG_INTERLACE) | |
647 | framedur_ns /= 2; | |
27641c3f | 648 | } else |
cc1ef118 | 649 | DRM_ERROR("crtc %u: Can't calculate constants, dotclock = 0!\n", |
27641c3f MK |
650 | crtc->base.id); |
651 | ||
eba1f35d VS |
652 | vblank->linedur_ns = linedur_ns; |
653 | vblank->framedur_ns = framedur_ns; | |
27641c3f | 654 | |
cc1ef118 | 655 | DRM_DEBUG("crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n", |
545cdd55 VS |
656 | crtc->base.id, mode->crtc_htotal, |
657 | mode->crtc_vtotal, mode->crtc_vdisplay); | |
20b20203 VS |
658 | DRM_DEBUG("crtc %u: clock %d kHz framedur %d linedur %d\n", |
659 | crtc->base.id, dotclock, framedur_ns, linedur_ns); | |
27641c3f MK |
660 | } |
661 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
662 | ||
663 | /** | |
f5752b38 DV |
664 | * drm_calc_vbltimestamp_from_scanoutpos - precise vblank timestamp helper |
665 | * @dev: DRM device | |
cc1ef118 | 666 | * @pipe: index of CRTC whose vblank timestamp to retrieve |
f5752b38 DV |
667 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) |
668 | * On return contains true maximum error of timestamp | |
669 | * @vblank_time: Pointer to struct timeval which should receive the timestamp | |
670 | * @flags: Flags to pass to driver: | |
671 | * 0 = Default, | |
672 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
f5752b38 DV |
673 | * @mode: mode which defines the scanout timings |
674 | * | |
675 | * Implements calculation of exact vblank timestamps from given drm_display_mode | |
676 | * timings and current video scanout position of a CRTC. This can be called from | |
677 | * within get_vblank_timestamp() implementation of a kms driver to implement the | |
678 | * actual timestamping. | |
27641c3f MK |
679 | * |
680 | * Should return timestamps conforming to the OML_sync_control OpenML | |
681 | * extension specification. The timestamp corresponds to the end of | |
682 | * the vblank interval, aka start of scanout of topmost-leftmost display | |
683 | * pixel in the following video frame. | |
684 | * | |
685 | * Requires support for optional dev->driver->get_scanout_position() | |
686 | * in kms driver, plus a bit of setup code to provide a drm_display_mode | |
687 | * that corresponds to the true scanout timing. | |
688 | * | |
689 | * The current implementation only handles standard video modes. It | |
690 | * returns as no operation if a doublescan or interlaced video mode is | |
691 | * active. Higher level code is expected to handle this. | |
692 | * | |
f5752b38 DV |
693 | * Returns: |
694 | * Negative value on error, failure or if not supported in current | |
27641c3f MK |
695 | * video mode: |
696 | * | |
f5752b38 | 697 | * -EINVAL - Invalid CRTC. |
27641c3f MK |
698 | * -EAGAIN - Temporary unavailable, e.g., called before initial modeset. |
699 | * -ENOTSUPP - Function not supported in current display mode. | |
700 | * -EIO - Failed, e.g., due to failed scanout position query. | |
701 | * | |
702 | * Returns or'ed positive status flags on success: | |
703 | * | |
704 | * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping. | |
705 | * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval. | |
706 | * | |
707 | */ | |
cc1ef118 TR |
708 | int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, |
709 | unsigned int pipe, | |
27641c3f MK |
710 | int *max_error, |
711 | struct timeval *vblank_time, | |
712 | unsigned flags, | |
7da903ef | 713 | const struct drm_display_mode *mode) |
27641c3f | 714 | { |
e62f2f5a | 715 | struct timeval tv_etime; |
d2cb58c8 | 716 | ktime_t stime, etime; |
ad1716ec VS |
717 | unsigned int vbl_status; |
718 | int ret = DRM_VBLANKTIME_SCANOUTPOS_METHOD; | |
27641c3f | 719 | int vpos, hpos, i; |
3bb403bf | 720 | int delta_ns, duration_ns; |
27641c3f | 721 | |
cc1ef118 TR |
722 | if (pipe >= dev->num_crtcs) { |
723 | DRM_ERROR("Invalid crtc %u\n", pipe); | |
27641c3f MK |
724 | return -EINVAL; |
725 | } | |
726 | ||
727 | /* Scanout position query not supported? Should not happen. */ | |
728 | if (!dev->driver->get_scanout_position) { | |
729 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); | |
730 | return -EIO; | |
731 | } | |
732 | ||
27641c3f MK |
733 | /* If mode timing undefined, just return as no-op: |
734 | * Happens during initial modesetting of a crtc. | |
735 | */ | |
3bb403bf | 736 | if (mode->crtc_clock == 0) { |
cc1ef118 | 737 | DRM_DEBUG("crtc %u: Noop due to uninitialized mode.\n", pipe); |
27641c3f MK |
738 | return -EAGAIN; |
739 | } | |
740 | ||
27641c3f MK |
741 | /* Get current scanout position with system timestamp. |
742 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
743 | * if single query takes longer than max_error nanoseconds. | |
744 | * | |
745 | * This guarantees a tight bound on maximum error if | |
746 | * code gets preempted or delayed for some reason. | |
747 | */ | |
748 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
8f6fce03 MK |
749 | /* |
750 | * Get vertical and horizontal scanout position vpos, hpos, | |
751 | * and bounding timestamps stime, etime, pre/post query. | |
752 | */ | |
3bb403bf VS |
753 | vbl_status = dev->driver->get_scanout_position(dev, pipe, flags, |
754 | &vpos, &hpos, | |
755 | &stime, &etime, | |
756 | mode); | |
27641c3f | 757 | |
27641c3f MK |
758 | /* Return as no-op if scanout query unsupported or failed. */ |
759 | if (!(vbl_status & DRM_SCANOUTPOS_VALID)) { | |
ad1716ec | 760 | DRM_DEBUG("crtc %u : scanoutpos query failed [0x%x].\n", |
cc1ef118 | 761 | pipe, vbl_status); |
27641c3f MK |
762 | return -EIO; |
763 | } | |
764 | ||
8f6fce03 | 765 | /* Compute uncertainty in timestamp of scanout position query. */ |
e62f2f5a | 766 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); |
27641c3f MK |
767 | |
768 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
3c184f69 | 769 | if (duration_ns <= *max_error) |
27641c3f MK |
770 | break; |
771 | } | |
772 | ||
773 | /* Noisy system timing? */ | |
774 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
cc1ef118 TR |
775 | DRM_DEBUG("crtc %u: Noisy timestamp %d us > %d us [%d reps].\n", |
776 | pipe, duration_ns/1000, *max_error/1000, i); | |
27641c3f MK |
777 | } |
778 | ||
779 | /* Return upper bound of timestamp precision error. */ | |
3c184f69 | 780 | *max_error = duration_ns; |
27641c3f MK |
781 | |
782 | /* Check if in vblank area: | |
783 | * vpos is >=0 in video scanout area, but negative | |
784 | * within vblank area, counting down the number of lines until | |
785 | * start of scanout. | |
786 | */ | |
ad1716ec VS |
787 | if (vbl_status & DRM_SCANOUTPOS_IN_VBLANK) |
788 | ret |= DRM_VBLANKTIME_IN_VBLANK; | |
27641c3f MK |
789 | |
790 | /* Convert scanout position into elapsed time at raw_time query | |
791 | * since start of scanout at first display scanline. delta_ns | |
792 | * can be negative if start of scanout hasn't happened yet. | |
793 | */ | |
3bb403bf VS |
794 | delta_ns = div_s64(1000000LL * (vpos * mode->crtc_htotal + hpos), |
795 | mode->crtc_clock); | |
27641c3f | 796 | |
c61eef72 | 797 | if (!drm_timestamp_monotonic) |
d2cb58c8 | 798 | etime = ktime_mono_to_real(etime); |
c61eef72 | 799 | |
e62f2f5a ID |
800 | /* save this only for debugging purposes */ |
801 | tv_etime = ktime_to_timeval(etime); | |
27641c3f MK |
802 | /* Subtract time delta from raw timestamp to get final |
803 | * vblank_time timestamp for end of vblank. | |
804 | */ | |
e91abf80 MD |
805 | if (delta_ns < 0) |
806 | etime = ktime_add_ns(etime, -delta_ns); | |
807 | else | |
808 | etime = ktime_sub_ns(etime, delta_ns); | |
e62f2f5a | 809 | *vblank_time = ktime_to_timeval(etime); |
27641c3f | 810 | |
235fabe0 VS |
811 | DRM_DEBUG_VBL("crtc %u : v 0x%x p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n", |
812 | pipe, vbl_status, hpos, vpos, | |
813 | (long)tv_etime.tv_sec, (long)tv_etime.tv_usec, | |
814 | (long)vblank_time->tv_sec, (long)vblank_time->tv_usec, | |
815 | duration_ns/1000, i); | |
27641c3f | 816 | |
ad1716ec | 817 | return ret; |
27641c3f MK |
818 | } |
819 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); | |
820 | ||
c61eef72 ID |
821 | static struct timeval get_drm_timestamp(void) |
822 | { | |
823 | ktime_t now; | |
824 | ||
d2cb58c8 | 825 | now = drm_timestamp_monotonic ? ktime_get() : ktime_get_real(); |
c61eef72 ID |
826 | return ktime_to_timeval(now); |
827 | } | |
828 | ||
27641c3f MK |
829 | /** |
830 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
4dfd909f | 831 | * vblank interval |
27641c3f | 832 | * @dev: DRM device |
cc1ef118 | 833 | * @pipe: index of CRTC whose vblank timestamp to retrieve |
27641c3f MK |
834 | * @tvblank: Pointer to target struct timeval which should receive the timestamp |
835 | * @flags: Flags to pass to driver: | |
f5752b38 DV |
836 | * 0 = Default, |
837 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
27641c3f MK |
838 | * |
839 | * Fetches the system timestamp corresponding to the time of the most recent | |
f5752b38 | 840 | * vblank interval on specified CRTC. May call into kms-driver to |
27641c3f MK |
841 | * compute the timestamp with a high-precision GPU specific method. |
842 | * | |
843 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
844 | * call, i.e., it isn't very precisely locked to the true vblank. | |
845 | * | |
f5752b38 | 846 | * Returns: |
fb446a1a | 847 | * True if timestamp is considered to be very precise, false otherwise. |
27641c3f | 848 | */ |
fb446a1a | 849 | static bool |
cc1ef118 | 850 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, |
fb446a1a | 851 | struct timeval *tvblank, unsigned flags) |
27641c3f | 852 | { |
4a1b0714 | 853 | int ret; |
27641c3f MK |
854 | |
855 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
856 | int max_error = (int) drm_timestamp_precision * 1000; | |
857 | ||
858 | /* Query driver if possible and precision timestamping enabled. */ | |
859 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) { | |
cc1ef118 | 860 | ret = dev->driver->get_vblank_timestamp(dev, pipe, &max_error, |
27641c3f MK |
861 | tvblank, flags); |
862 | if (ret > 0) | |
fb446a1a | 863 | return true; |
27641c3f MK |
864 | } |
865 | ||
866 | /* GPU high precision timestamp query unsupported or failed. | |
c61eef72 | 867 | * Return current monotonic/gettimeofday timestamp as best estimate. |
27641c3f | 868 | */ |
c61eef72 | 869 | *tvblank = get_drm_timestamp(); |
27641c3f | 870 | |
fb446a1a | 871 | return false; |
27641c3f | 872 | } |
27641c3f | 873 | |
0a3e67a4 JB |
874 | /** |
875 | * drm_vblank_count - retrieve "cooked" vblank counter value | |
876 | * @dev: DRM device | |
cc1ef118 | 877 | * @pipe: index of CRTC for which to retrieve the counter |
0a3e67a4 JB |
878 | * |
879 | * Fetches the "cooked" vblank count value that represents the number of | |
880 | * vblank events since the system was booted, including lost events due to | |
881 | * modesetting activity. | |
f5752b38 | 882 | * |
96d3f91e TR |
883 | * This is the legacy version of drm_crtc_vblank_count(). |
884 | * | |
f5752b38 DV |
885 | * Returns: |
886 | * The software vblank counter. | |
0a3e67a4 | 887 | */ |
88e72717 | 888 | u32 drm_vblank_count(struct drm_device *dev, unsigned int pipe) |
0a3e67a4 | 889 | { |
cc1ef118 | 890 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
8a51d5be | 891 | |
cc1ef118 | 892 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 | 893 | return 0; |
7d1de851 | 894 | |
99264a61 | 895 | return vblank->count; |
0a3e67a4 JB |
896 | } |
897 | EXPORT_SYMBOL(drm_vblank_count); | |
898 | ||
96d3f91e TR |
899 | /** |
900 | * drm_crtc_vblank_count - retrieve "cooked" vblank counter value | |
901 | * @crtc: which counter to retrieve | |
902 | * | |
903 | * Fetches the "cooked" vblank count value that represents the number of | |
904 | * vblank events since the system was booted, including lost events due to | |
905 | * modesetting activity. | |
906 | * | |
907 | * This is the native KMS version of drm_vblank_count(). | |
908 | * | |
909 | * Returns: | |
910 | * The software vblank counter. | |
911 | */ | |
912 | u32 drm_crtc_vblank_count(struct drm_crtc *crtc) | |
913 | { | |
914 | return drm_vblank_count(crtc->dev, drm_crtc_index(crtc)); | |
915 | } | |
916 | EXPORT_SYMBOL(drm_crtc_vblank_count); | |
917 | ||
27641c3f | 918 | /** |
cc1ef118 TR |
919 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value and the |
920 | * system timestamp corresponding to that vblank counter value. | |
27641c3f | 921 | * @dev: DRM device |
cc1ef118 | 922 | * @pipe: index of CRTC whose counter to retrieve |
27641c3f MK |
923 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. |
924 | * | |
925 | * Fetches the "cooked" vblank count value that represents the number of | |
926 | * vblank events since the system was booted, including lost events due to | |
927 | * modesetting activity. Returns corresponding system timestamp of the time | |
f5752b38 | 928 | * of the vblank interval that corresponds to the current vblank counter value. |
cf648305 TR |
929 | * |
930 | * This is the legacy version of drm_crtc_vblank_count_and_time(). | |
27641c3f | 931 | */ |
cc1ef118 | 932 | u32 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe, |
27641c3f MK |
933 | struct timeval *vblanktime) |
934 | { | |
cc1ef118 | 935 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
facfb062 | 936 | int count = DRM_TIMESTAMP_MAXRETRIES; |
27641c3f MK |
937 | u32 cur_vblank; |
938 | ||
cc1ef118 | 939 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
940 | return 0; |
941 | ||
99264a61 DV |
942 | /* |
943 | * Vblank timestamps are read lockless. To ensure consistency the vblank | |
944 | * counter is rechecked and ordering is ensured using memory barriers. | |
945 | * This works like a seqlock. The write-side barriers are in store_vblank. | |
27641c3f MK |
946 | */ |
947 | do { | |
99264a61 DV |
948 | cur_vblank = vblank->count; |
949 | smp_rmb(); | |
cc1ef118 | 950 | *vblanktime = vblanktimestamp(dev, pipe, cur_vblank); |
27641c3f | 951 | smp_rmb(); |
facfb062 | 952 | } while (cur_vblank != vblank->count && --count > 0); |
27641c3f MK |
953 | |
954 | return cur_vblank; | |
955 | } | |
956 | EXPORT_SYMBOL(drm_vblank_count_and_time); | |
957 | ||
cf648305 TR |
958 | /** |
959 | * drm_crtc_vblank_count_and_time - retrieve "cooked" vblank counter value | |
960 | * and the system timestamp corresponding to that vblank counter value | |
961 | * @crtc: which counter to retrieve | |
962 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. | |
963 | * | |
964 | * Fetches the "cooked" vblank count value that represents the number of | |
965 | * vblank events since the system was booted, including lost events due to | |
966 | * modesetting activity. Returns corresponding system timestamp of the time | |
967 | * of the vblank interval that corresponds to the current vblank counter value. | |
968 | * | |
969 | * This is the native KMS version of drm_vblank_count_and_time(). | |
970 | */ | |
971 | u32 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc, | |
972 | struct timeval *vblanktime) | |
973 | { | |
974 | return drm_vblank_count_and_time(crtc->dev, drm_crtc_index(crtc), | |
975 | vblanktime); | |
976 | } | |
977 | EXPORT_SYMBOL(drm_crtc_vblank_count_and_time); | |
978 | ||
c6eefa17 RC |
979 | static void send_vblank_event(struct drm_device *dev, |
980 | struct drm_pending_vblank_event *e, | |
981 | unsigned long seq, struct timeval *now) | |
982 | { | |
983 | WARN_ON_SMP(!spin_is_locked(&dev->event_lock)); | |
984 | e->event.sequence = seq; | |
985 | e->event.tv_sec = now->tv_sec; | |
986 | e->event.tv_usec = now->tv_usec; | |
987 | ||
988 | list_add_tail(&e->base.link, | |
989 | &e->base.file_priv->event_list); | |
990 | wake_up_interruptible(&e->base.file_priv->event_wait); | |
991 | trace_drm_vblank_event_delivered(e->base.pid, e->pipe, | |
992 | e->event.sequence); | |
993 | } | |
994 | ||
995 | /** | |
996 | * drm_send_vblank_event - helper to send vblank event after pageflip | |
997 | * @dev: DRM device | |
cc1ef118 | 998 | * @pipe: CRTC index |
c6eefa17 RC |
999 | * @e: the event to send |
1000 | * | |
1001 | * Updates sequence # and timestamp on event, and sends it to userspace. | |
1002 | * Caller must hold event lock. | |
a4d7b30d TR |
1003 | * |
1004 | * This is the legacy version of drm_crtc_send_vblank_event(). | |
c6eefa17 | 1005 | */ |
cc1ef118 TR |
1006 | void drm_send_vblank_event(struct drm_device *dev, unsigned int pipe, |
1007 | struct drm_pending_vblank_event *e) | |
c6eefa17 RC |
1008 | { |
1009 | struct timeval now; | |
1010 | unsigned int seq; | |
4dfd909f | 1011 | |
2a7d3d6d | 1012 | if (dev->num_crtcs > 0) { |
cc1ef118 | 1013 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
c6eefa17 RC |
1014 | } else { |
1015 | seq = 0; | |
c61eef72 ID |
1016 | |
1017 | now = get_drm_timestamp(); | |
c6eefa17 | 1018 | } |
cc1ef118 | 1019 | e->pipe = pipe; |
c6eefa17 RC |
1020 | send_vblank_event(dev, e, seq, &now); |
1021 | } | |
1022 | EXPORT_SYMBOL(drm_send_vblank_event); | |
1023 | ||
a4d7b30d TR |
1024 | /** |
1025 | * drm_crtc_send_vblank_event - helper to send vblank event after pageflip | |
1026 | * @crtc: the source CRTC of the vblank event | |
1027 | * @e: the event to send | |
1028 | * | |
1029 | * Updates sequence # and timestamp on event, and sends it to userspace. | |
1030 | * Caller must hold event lock. | |
1031 | * | |
1032 | * This is the native KMS version of drm_send_vblank_event(). | |
1033 | */ | |
1034 | void drm_crtc_send_vblank_event(struct drm_crtc *crtc, | |
1035 | struct drm_pending_vblank_event *e) | |
1036 | { | |
1037 | drm_send_vblank_event(crtc->dev, drm_crtc_index(crtc), e); | |
1038 | } | |
1039 | EXPORT_SYMBOL(drm_crtc_send_vblank_event); | |
1040 | ||
f2752282 VS |
1041 | /** |
1042 | * drm_vblank_enable - enable the vblank interrupt on a CRTC | |
1043 | * @dev: DRM device | |
cc1ef118 | 1044 | * @pipe: CRTC index |
c30e11fc TR |
1045 | * |
1046 | * Returns: | |
1047 | * Zero on success or a negative error code on failure. | |
f2752282 | 1048 | */ |
cc1ef118 | 1049 | static int drm_vblank_enable(struct drm_device *dev, unsigned int pipe) |
f2752282 | 1050 | { |
cc1ef118 | 1051 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
f2752282 VS |
1052 | int ret = 0; |
1053 | ||
1054 | assert_spin_locked(&dev->vbl_lock); | |
1055 | ||
1056 | spin_lock(&dev->vblank_time_lock); | |
1057 | ||
8a51d5be | 1058 | if (!vblank->enabled) { |
1cfb80b1 DV |
1059 | /* |
1060 | * Enable vblank irqs under vblank_time_lock protection. | |
f2752282 VS |
1061 | * All vblank count & timestamp updates are held off |
1062 | * until we are done reinitializing master counter and | |
1063 | * timestamps. Filtercode in drm_handle_vblank() will | |
1064 | * prevent double-accounting of same vblank interval. | |
1065 | */ | |
cc1ef118 TR |
1066 | ret = dev->driver->enable_vblank(dev, pipe); |
1067 | DRM_DEBUG("enabling vblank on crtc %u, ret: %d\n", pipe, ret); | |
f2752282 | 1068 | if (ret) |
8a51d5be | 1069 | atomic_dec(&vblank->refcount); |
f2752282 | 1070 | else { |
8a51d5be | 1071 | vblank->enabled = true; |
a6e610dc | 1072 | drm_update_vblank_count(dev, pipe, 0); |
f2752282 VS |
1073 | } |
1074 | } | |
1075 | ||
1076 | spin_unlock(&dev->vblank_time_lock); | |
1077 | ||
1078 | return ret; | |
1079 | } | |
1080 | ||
0a3e67a4 JB |
1081 | /** |
1082 | * drm_vblank_get - get a reference count on vblank events | |
1083 | * @dev: DRM device | |
cc1ef118 | 1084 | * @pipe: index of CRTC to own |
0a3e67a4 JB |
1085 | * |
1086 | * Acquire a reference count on vblank events to avoid having them disabled | |
1087 | * while in use. | |
1088 | * | |
89dd6a4b DV |
1089 | * This is the legacy version of drm_crtc_vblank_get(). |
1090 | * | |
f5752b38 | 1091 | * Returns: |
c30e11fc | 1092 | * Zero on success or a negative error code on failure. |
0a3e67a4 | 1093 | */ |
cc1ef118 | 1094 | int drm_vblank_get(struct drm_device *dev, unsigned int pipe) |
0a3e67a4 | 1095 | { |
cc1ef118 | 1096 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
97cbc883 | 1097 | unsigned long irqflags; |
0a3e67a4 JB |
1098 | int ret = 0; |
1099 | ||
16e3247d GH |
1100 | if (!dev->num_crtcs) |
1101 | return -EINVAL; | |
1102 | ||
cc1ef118 | 1103 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1104 | return -EINVAL; |
1105 | ||
0a3e67a4 JB |
1106 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
1107 | /* Going from 0->1 means we have to enable interrupts again */ | |
8a51d5be | 1108 | if (atomic_add_return(1, &vblank->refcount) == 1) { |
cc1ef118 | 1109 | ret = drm_vblank_enable(dev, pipe); |
778c9026 | 1110 | } else { |
8a51d5be VS |
1111 | if (!vblank->enabled) { |
1112 | atomic_dec(&vblank->refcount); | |
778c9026 | 1113 | ret = -EINVAL; |
0a3e67a4 JB |
1114 | } |
1115 | } | |
1116 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1117 | ||
1118 | return ret; | |
1119 | } | |
1120 | EXPORT_SYMBOL(drm_vblank_get); | |
1121 | ||
89dd6a4b DV |
1122 | /** |
1123 | * drm_crtc_vblank_get - get a reference count on vblank events | |
1124 | * @crtc: which CRTC to own | |
1125 | * | |
1126 | * Acquire a reference count on vblank events to avoid having them disabled | |
1127 | * while in use. | |
1128 | * | |
30b79f06 | 1129 | * This is the native kms version of drm_vblank_get(). |
89dd6a4b DV |
1130 | * |
1131 | * Returns: | |
c30e11fc | 1132 | * Zero on success or a negative error code on failure. |
89dd6a4b DV |
1133 | */ |
1134 | int drm_crtc_vblank_get(struct drm_crtc *crtc) | |
1135 | { | |
1136 | return drm_vblank_get(crtc->dev, drm_crtc_index(crtc)); | |
1137 | } | |
1138 | EXPORT_SYMBOL(drm_crtc_vblank_get); | |
1139 | ||
0a3e67a4 | 1140 | /** |
cc1ef118 | 1141 | * drm_vblank_put - release ownership of vblank events |
0a3e67a4 | 1142 | * @dev: DRM device |
cc1ef118 | 1143 | * @pipe: index of CRTC to release |
0a3e67a4 JB |
1144 | * |
1145 | * Release ownership of a given vblank counter, turning off interrupts | |
27641c3f | 1146 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. |
89dd6a4b DV |
1147 | * |
1148 | * This is the legacy version of drm_crtc_vblank_put(). | |
0a3e67a4 | 1149 | */ |
cc1ef118 | 1150 | void drm_vblank_put(struct drm_device *dev, unsigned int pipe) |
0a3e67a4 | 1151 | { |
cc1ef118 | 1152 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
8a51d5be | 1153 | |
cc1ef118 | 1154 | if (WARN_ON(pipe >= dev->num_crtcs)) |
7f907bf2 | 1155 | return; |
b3f5e732 | 1156 | |
7d1de851 | 1157 | if (WARN_ON(atomic_read(&vblank->refcount) == 0)) |
e6ae8687 RC |
1158 | return; |
1159 | ||
0a3e67a4 | 1160 | /* Last user schedules interrupt disable */ |
4ed0ce3d | 1161 | if (atomic_dec_and_test(&vblank->refcount)) { |
ab8905f1 DV |
1162 | if (drm_vblank_offdelay == 0) |
1163 | return; | |
1164 | else if (dev->vblank_disable_immediate || drm_vblank_offdelay < 0) | |
4ed0ce3d | 1165 | vblank_disable_fn((unsigned long)vblank); |
ab8905f1 | 1166 | else |
4ed0ce3d VS |
1167 | mod_timer(&vblank->disable_timer, |
1168 | jiffies + ((drm_vblank_offdelay * HZ)/1000)); | |
1169 | } | |
0a3e67a4 JB |
1170 | } |
1171 | EXPORT_SYMBOL(drm_vblank_put); | |
1172 | ||
89dd6a4b DV |
1173 | /** |
1174 | * drm_crtc_vblank_put - give up ownership of vblank events | |
1175 | * @crtc: which counter to give up | |
1176 | * | |
1177 | * Release ownership of a given vblank counter, turning off interrupts | |
1178 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. | |
1179 | * | |
1180 | * This is the native kms version of drm_vblank_put(). | |
1181 | */ | |
1182 | void drm_crtc_vblank_put(struct drm_crtc *crtc) | |
1183 | { | |
1184 | drm_vblank_put(crtc->dev, drm_crtc_index(crtc)); | |
1185 | } | |
1186 | EXPORT_SYMBOL(drm_crtc_vblank_put); | |
1187 | ||
e8450f51 DV |
1188 | /** |
1189 | * drm_wait_one_vblank - wait for one vblank | |
1190 | * @dev: DRM device | |
cc1ef118 | 1191 | * @pipe: CRTC index |
e8450f51 | 1192 | * |
1da248a5 VS |
1193 | * This waits for one vblank to pass on @pipe, using the irq driver interfaces. |
1194 | * It is a failure to call this when the vblank irq for @pipe is disabled, e.g. | |
e8450f51 DV |
1195 | * due to lack of driver support or because the crtc is off. |
1196 | */ | |
cc1ef118 | 1197 | void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe) |
e8450f51 | 1198 | { |
cc1ef118 | 1199 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
e8450f51 DV |
1200 | int ret; |
1201 | u32 last; | |
1202 | ||
cc1ef118 | 1203 | if (WARN_ON(pipe >= dev->num_crtcs)) |
7d1de851 TR |
1204 | return; |
1205 | ||
cc1ef118 TR |
1206 | ret = drm_vblank_get(dev, pipe); |
1207 | if (WARN(ret, "vblank not available on crtc %i, ret=%i\n", pipe, ret)) | |
e8450f51 DV |
1208 | return; |
1209 | ||
cc1ef118 | 1210 | last = drm_vblank_count(dev, pipe); |
e8450f51 | 1211 | |
cc1ef118 TR |
1212 | ret = wait_event_timeout(vblank->queue, |
1213 | last != drm_vblank_count(dev, pipe), | |
e8450f51 DV |
1214 | msecs_to_jiffies(100)); |
1215 | ||
cc1ef118 | 1216 | WARN(ret == 0, "vblank wait timed out on crtc %i\n", pipe); |
e8450f51 | 1217 | |
cc1ef118 | 1218 | drm_vblank_put(dev, pipe); |
e8450f51 DV |
1219 | } |
1220 | EXPORT_SYMBOL(drm_wait_one_vblank); | |
1221 | ||
1222 | /** | |
1223 | * drm_crtc_wait_one_vblank - wait for one vblank | |
1224 | * @crtc: DRM crtc | |
1225 | * | |
1226 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. | |
1227 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. | |
1228 | * due to lack of driver support or because the crtc is off. | |
1229 | */ | |
1230 | void drm_crtc_wait_one_vblank(struct drm_crtc *crtc) | |
1231 | { | |
1232 | drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1233 | } | |
1234 | EXPORT_SYMBOL(drm_crtc_wait_one_vblank); | |
1235 | ||
c6eefa17 RC |
1236 | /** |
1237 | * drm_vblank_off - disable vblank events on a CRTC | |
1238 | * @dev: DRM device | |
cc1ef118 | 1239 | * @pipe: CRTC index |
c6eefa17 | 1240 | * |
f5752b38 DV |
1241 | * Drivers can use this function to shut down the vblank interrupt handling when |
1242 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1243 | * stored so that drm_vblank_on() can restore it again. | |
1244 | * | |
1245 | * Drivers must use this function when the hardware vblank counter can get | |
1246 | * reset, e.g. when suspending. | |
89dd6a4b DV |
1247 | * |
1248 | * This is the legacy version of drm_crtc_vblank_off(). | |
c6eefa17 | 1249 | */ |
cc1ef118 | 1250 | void drm_vblank_off(struct drm_device *dev, unsigned int pipe) |
778c9026 | 1251 | { |
cc1ef118 | 1252 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
498548ec CJHR |
1253 | struct drm_pending_vblank_event *e, *t; |
1254 | struct timeval now; | |
778c9026 | 1255 | unsigned long irqflags; |
498548ec | 1256 | unsigned int seq; |
778c9026 | 1257 | |
cc1ef118 | 1258 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1259 | return; |
1260 | ||
56cc279b VS |
1261 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1262 | ||
1263 | spin_lock(&dev->vbl_lock); | |
cc1ef118 | 1264 | vblank_disable_and_save(dev, pipe); |
8a51d5be | 1265 | wake_up(&vblank->queue); |
498548ec | 1266 | |
56cc279b VS |
1267 | /* |
1268 | * Prevent subsequent drm_vblank_get() from re-enabling | |
1269 | * the vblank interrupt by bumping the refcount. | |
1270 | */ | |
1271 | if (!vblank->inmodeset) { | |
1272 | atomic_inc(&vblank->refcount); | |
1273 | vblank->inmodeset = 1; | |
1274 | } | |
1275 | spin_unlock(&dev->vbl_lock); | |
1276 | ||
498548ec | 1277 | /* Send any queued vblank events, lest the natives grow disquiet */ |
cc1ef118 | 1278 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
e7783ba3 | 1279 | |
498548ec | 1280 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { |
cc1ef118 | 1281 | if (e->pipe != pipe) |
498548ec | 1282 | continue; |
44844892 VS |
1283 | DRM_DEBUG("Sending premature vblank event on disable: " |
1284 | "wanted %d, current %d\n", | |
498548ec | 1285 | e->event.sequence, seq); |
c6eefa17 | 1286 | list_del(&e->base.link); |
cc1ef118 | 1287 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1288 | send_vblank_event(dev, e, seq, &now); |
498548ec | 1289 | } |
56cc279b | 1290 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
778c9026 LP |
1291 | } |
1292 | EXPORT_SYMBOL(drm_vblank_off); | |
1293 | ||
89dd6a4b DV |
1294 | /** |
1295 | * drm_crtc_vblank_off - disable vblank events on a CRTC | |
1296 | * @crtc: CRTC in question | |
1297 | * | |
1298 | * Drivers can use this function to shut down the vblank interrupt handling when | |
1299 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1300 | * stored so that drm_vblank_on can restore it again. | |
1301 | * | |
1302 | * Drivers must use this function when the hardware vblank counter can get | |
1303 | * reset, e.g. when suspending. | |
1304 | * | |
1305 | * This is the native kms version of drm_vblank_off(). | |
1306 | */ | |
1307 | void drm_crtc_vblank_off(struct drm_crtc *crtc) | |
1308 | { | |
1309 | drm_vblank_off(crtc->dev, drm_crtc_index(crtc)); | |
1310 | } | |
1311 | EXPORT_SYMBOL(drm_crtc_vblank_off); | |
1312 | ||
9625604c DV |
1313 | /** |
1314 | * drm_crtc_vblank_reset - reset vblank state to off on a CRTC | |
2b193f02 | 1315 | * @crtc: CRTC in question |
9625604c DV |
1316 | * |
1317 | * Drivers can use this function to reset the vblank state to off at load time. | |
1318 | * Drivers should use this together with the drm_crtc_vblank_off() and | |
1319 | * drm_crtc_vblank_on() functions. The difference compared to | |
1320 | * drm_crtc_vblank_off() is that this function doesn't save the vblank counter | |
1321 | * and hence doesn't need to call any driver hooks. | |
1322 | */ | |
2b193f02 | 1323 | void drm_crtc_vblank_reset(struct drm_crtc *crtc) |
9625604c | 1324 | { |
2b193f02 | 1325 | struct drm_device *dev = crtc->dev; |
9625604c | 1326 | unsigned long irqflags; |
2b193f02 | 1327 | unsigned int pipe = drm_crtc_index(crtc); |
1da248a5 | 1328 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
9625604c DV |
1329 | |
1330 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1331 | /* | |
1332 | * Prevent subsequent drm_vblank_get() from enabling the vblank | |
1333 | * interrupt by bumping the refcount. | |
1334 | */ | |
1335 | if (!vblank->inmodeset) { | |
1336 | atomic_inc(&vblank->refcount); | |
1337 | vblank->inmodeset = 1; | |
1338 | } | |
1339 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1340 | ||
1341 | WARN_ON(!list_empty(&dev->vblank_event_list)); | |
1342 | } | |
1343 | EXPORT_SYMBOL(drm_crtc_vblank_reset); | |
1344 | ||
f2752282 VS |
1345 | /** |
1346 | * drm_vblank_on - enable vblank events on a CRTC | |
1347 | * @dev: DRM device | |
cc1ef118 | 1348 | * @pipe: CRTC index |
f5752b38 DV |
1349 | * |
1350 | * This functions restores the vblank interrupt state captured with | |
1351 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
32197aab | 1352 | * drm_vblank_off() can be unbalanced and so can also be unconditionally called |
f5752b38 | 1353 | * in driver load code to reflect the current hardware state of the crtc. |
89dd6a4b DV |
1354 | * |
1355 | * This is the legacy version of drm_crtc_vblank_on(). | |
f2752282 | 1356 | */ |
cc1ef118 | 1357 | void drm_vblank_on(struct drm_device *dev, unsigned int pipe) |
f2752282 | 1358 | { |
cc1ef118 | 1359 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
f2752282 VS |
1360 | unsigned long irqflags; |
1361 | ||
cc1ef118 | 1362 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1363 | return; |
1364 | ||
f2752282 | 1365 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
7ffd7a68 | 1366 | /* Drop our private "prevent drm_vblank_get" refcount */ |
8a51d5be VS |
1367 | if (vblank->inmodeset) { |
1368 | atomic_dec(&vblank->refcount); | |
1369 | vblank->inmodeset = 0; | |
7ffd7a68 | 1370 | } |
f8ad028c | 1371 | |
4dfd6486 VS |
1372 | drm_reset_vblank_timestamp(dev, pipe); |
1373 | ||
cd19e52a VS |
1374 | /* |
1375 | * re-enable interrupts if there are users left, or the | |
1376 | * user wishes vblank interrupts to be enabled all the time. | |
1377 | */ | |
1378 | if (atomic_read(&vblank->refcount) != 0 || | |
1379 | (!dev->vblank_disable_immediate && drm_vblank_offdelay == 0)) | |
cc1ef118 | 1380 | WARN_ON(drm_vblank_enable(dev, pipe)); |
f2752282 VS |
1381 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
1382 | } | |
1383 | EXPORT_SYMBOL(drm_vblank_on); | |
1384 | ||
89dd6a4b DV |
1385 | /** |
1386 | * drm_crtc_vblank_on - enable vblank events on a CRTC | |
1387 | * @crtc: CRTC in question | |
1388 | * | |
1389 | * This functions restores the vblank interrupt state captured with | |
1390 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
32197aab | 1391 | * drm_vblank_off() can be unbalanced and so can also be unconditionally called |
89dd6a4b DV |
1392 | * in driver load code to reflect the current hardware state of the crtc. |
1393 | * | |
1394 | * This is the native kms version of drm_vblank_on(). | |
1395 | */ | |
1396 | void drm_crtc_vblank_on(struct drm_crtc *crtc) | |
1397 | { | |
1398 | drm_vblank_on(crtc->dev, drm_crtc_index(crtc)); | |
1399 | } | |
1400 | EXPORT_SYMBOL(drm_crtc_vblank_on); | |
1401 | ||
f453ba04 DA |
1402 | /** |
1403 | * drm_vblank_pre_modeset - account for vblanks across mode sets | |
1404 | * @dev: DRM device | |
cc1ef118 | 1405 | * @pipe: CRTC index |
f453ba04 DA |
1406 | * |
1407 | * Account for vblank events across mode setting events, which will likely | |
1408 | * reset the hardware frame counter. | |
f5752b38 DV |
1409 | * |
1410 | * This is done by grabbing a temporary vblank reference to ensure that the | |
1411 | * vblank interrupt keeps running across the modeset sequence. With this the | |
1412 | * software-side vblank frame counting will ensure that there are no jumps or | |
1413 | * discontinuities. | |
1414 | * | |
1415 | * Unfortunately this approach is racy and also doesn't work when the vblank | |
1416 | * interrupt stops running, e.g. across system suspend resume. It is therefore | |
1417 | * highly recommended that drivers use the newer drm_vblank_off() and | |
1418 | * drm_vblank_on() instead. drm_vblank_pre_modeset() only works correctly when | |
1419 | * using "cooked" software vblank frame counters and not relying on any hardware | |
1420 | * counters. | |
1421 | * | |
1422 | * Drivers must call drm_vblank_post_modeset() when re-enabling the same crtc | |
1423 | * again. | |
f453ba04 | 1424 | */ |
cc1ef118 | 1425 | void drm_vblank_pre_modeset(struct drm_device *dev, unsigned int pipe) |
f453ba04 | 1426 | { |
cc1ef118 | 1427 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
8a51d5be | 1428 | |
b7ea85a4 | 1429 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
e77cef9c JG |
1430 | if (!dev->num_crtcs) |
1431 | return; | |
e6ae8687 | 1432 | |
cc1ef118 | 1433 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1434 | return; |
1435 | ||
f453ba04 DA |
1436 | /* |
1437 | * To avoid all the problems that might happen if interrupts | |
1438 | * were enabled/disabled around or between these calls, we just | |
1439 | * have the kernel take a reference on the CRTC (just once though | |
1440 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
1441 | * so that interrupts remain enabled in the interim. | |
1442 | */ | |
8a51d5be VS |
1443 | if (!vblank->inmodeset) { |
1444 | vblank->inmodeset = 0x1; | |
cc1ef118 | 1445 | if (drm_vblank_get(dev, pipe) == 0) |
8a51d5be | 1446 | vblank->inmodeset |= 0x2; |
f453ba04 DA |
1447 | } |
1448 | } | |
1449 | EXPORT_SYMBOL(drm_vblank_pre_modeset); | |
1450 | ||
f5752b38 DV |
1451 | /** |
1452 | * drm_vblank_post_modeset - undo drm_vblank_pre_modeset changes | |
1453 | * @dev: DRM device | |
cc1ef118 | 1454 | * @pipe: CRTC index |
f5752b38 DV |
1455 | * |
1456 | * This function again drops the temporary vblank reference acquired in | |
1457 | * drm_vblank_pre_modeset. | |
1458 | */ | |
cc1ef118 | 1459 | void drm_vblank_post_modeset(struct drm_device *dev, unsigned int pipe) |
f453ba04 | 1460 | { |
cc1ef118 | 1461 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
f453ba04 DA |
1462 | unsigned long irqflags; |
1463 | ||
b7ea85a4 HC |
1464 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
1465 | if (!dev->num_crtcs) | |
1466 | return; | |
1467 | ||
cc1ef118 | 1468 | if (WARN_ON(pipe >= dev->num_crtcs)) |
7d1de851 TR |
1469 | return; |
1470 | ||
8a51d5be | 1471 | if (vblank->inmodeset) { |
f453ba04 | 1472 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
ba0bf120 | 1473 | dev->vblank_disable_allowed = true; |
f453ba04 | 1474 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
b3f5e732 | 1475 | |
8a51d5be | 1476 | if (vblank->inmodeset & 0x2) |
cc1ef118 | 1477 | drm_vblank_put(dev, pipe); |
b3f5e732 | 1478 | |
8a51d5be | 1479 | vblank->inmodeset = 0; |
f453ba04 DA |
1480 | } |
1481 | } | |
1482 | EXPORT_SYMBOL(drm_vblank_post_modeset); | |
1483 | ||
f5752b38 | 1484 | /* |
0a3e67a4 JB |
1485 | * drm_modeset_ctl - handle vblank event counter changes across mode switch |
1486 | * @DRM_IOCTL_ARGS: standard ioctl arguments | |
1487 | * | |
1488 | * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET | |
1489 | * ioctls around modesetting so that any lost vblank events are accounted for. | |
1490 | * | |
1491 | * Generally the counter will reset across mode sets. If interrupts are | |
1492 | * enabled around this call, we don't have to do anything since the counter | |
1493 | * will have already been incremented. | |
1494 | */ | |
1495 | int drm_modeset_ctl(struct drm_device *dev, void *data, | |
1496 | struct drm_file *file_priv) | |
1497 | { | |
1498 | struct drm_modeset_ctl *modeset = data; | |
cc1ef118 | 1499 | unsigned int pipe; |
0a3e67a4 JB |
1500 | |
1501 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
1502 | if (!dev->num_crtcs) | |
4a1b0714 | 1503 | return 0; |
0a3e67a4 | 1504 | |
29935554 LP |
1505 | /* KMS drivers handle this internally */ |
1506 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
1507 | return 0; | |
1508 | ||
cc1ef118 TR |
1509 | pipe = modeset->crtc; |
1510 | if (pipe >= dev->num_crtcs) | |
4a1b0714 | 1511 | return -EINVAL; |
0a3e67a4 | 1512 | |
0a3e67a4 JB |
1513 | switch (modeset->cmd) { |
1514 | case _DRM_PRE_MODESET: | |
cc1ef118 | 1515 | drm_vblank_pre_modeset(dev, pipe); |
0a3e67a4 JB |
1516 | break; |
1517 | case _DRM_POST_MODESET: | |
cc1ef118 | 1518 | drm_vblank_post_modeset(dev, pipe); |
0a3e67a4 JB |
1519 | break; |
1520 | default: | |
4a1b0714 | 1521 | return -EINVAL; |
0a3e67a4 JB |
1522 | } |
1523 | ||
4a1b0714 | 1524 | return 0; |
0a3e67a4 JB |
1525 | } |
1526 | ||
cc1ef118 | 1527 | static int drm_queue_vblank_event(struct drm_device *dev, unsigned int pipe, |
c9a9c5e0 KH |
1528 | union drm_wait_vblank *vblwait, |
1529 | struct drm_file *file_priv) | |
1530 | { | |
ffe7c73a | 1531 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
c9a9c5e0 KH |
1532 | struct drm_pending_vblank_event *e; |
1533 | struct timeval now; | |
1534 | unsigned long flags; | |
1535 | unsigned int seq; | |
ea5d552c | 1536 | int ret; |
c9a9c5e0 | 1537 | |
f76511b9 | 1538 | e = kzalloc(sizeof(*e), GFP_KERNEL); |
ea5d552c CW |
1539 | if (e == NULL) { |
1540 | ret = -ENOMEM; | |
1541 | goto err_put; | |
1542 | } | |
c9a9c5e0 KH |
1543 | |
1544 | e->pipe = pipe; | |
b9c2c9ae | 1545 | e->base.pid = current->pid; |
c9a9c5e0 | 1546 | e->event.base.type = DRM_EVENT_VBLANK; |
f76511b9 | 1547 | e->event.base.length = sizeof(e->event); |
c9a9c5e0 KH |
1548 | e->event.user_data = vblwait->request.signal; |
1549 | e->base.event = &e->event.base; | |
1550 | e->base.file_priv = file_priv; | |
1551 | e->base.destroy = (void (*) (struct drm_pending_event *)) kfree; | |
1552 | ||
c9a9c5e0 KH |
1553 | spin_lock_irqsave(&dev->event_lock, flags); |
1554 | ||
ffe7c73a VS |
1555 | /* |
1556 | * drm_vblank_off() might have been called after we called | |
1557 | * drm_vblank_get(). drm_vblank_off() holds event_lock | |
1558 | * around the vblank disable, so no need for further locking. | |
1559 | * The reference from drm_vblank_get() protects against | |
1560 | * vblank disable from another source. | |
1561 | */ | |
1562 | if (!vblank->enabled) { | |
1563 | ret = -EINVAL; | |
1564 | goto err_unlock; | |
1565 | } | |
1566 | ||
f76511b9 | 1567 | if (file_priv->event_space < sizeof(e->event)) { |
ea5d552c CW |
1568 | ret = -EBUSY; |
1569 | goto err_unlock; | |
c9a9c5e0 KH |
1570 | } |
1571 | ||
f76511b9 | 1572 | file_priv->event_space -= sizeof(e->event); |
27641c3f MK |
1573 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1574 | ||
c9a9c5e0 KH |
1575 | if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) && |
1576 | (seq - vblwait->request.sequence) <= (1 << 23)) { | |
1577 | vblwait->request.sequence = seq + 1; | |
4a921645 | 1578 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1579 | } |
1580 | ||
cc1ef118 | 1581 | DRM_DEBUG("event on vblank count %d, current %d, crtc %u\n", |
c9a9c5e0 KH |
1582 | vblwait->request.sequence, seq, pipe); |
1583 | ||
b9c2c9ae JB |
1584 | trace_drm_vblank_event_queued(current->pid, pipe, |
1585 | vblwait->request.sequence); | |
1586 | ||
c9a9c5e0 KH |
1587 | e->event.sequence = vblwait->request.sequence; |
1588 | if ((seq - vblwait->request.sequence) <= (1 << 23)) { | |
6f331623 | 1589 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1590 | send_vblank_event(dev, e, seq, &now); |
000fa7cf | 1591 | vblwait->reply.sequence = seq; |
c9a9c5e0 | 1592 | } else { |
a6778e9e | 1593 | /* drm_handle_vblank_events will call drm_vblank_put */ |
c9a9c5e0 | 1594 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
000fa7cf | 1595 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1596 | } |
1597 | ||
1598 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1599 | ||
1600 | return 0; | |
ea5d552c CW |
1601 | |
1602 | err_unlock: | |
1603 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1604 | kfree(e); | |
1605 | err_put: | |
6f331623 | 1606 | drm_vblank_put(dev, pipe); |
ea5d552c | 1607 | return ret; |
c9a9c5e0 KH |
1608 | } |
1609 | ||
f5752b38 | 1610 | /* |
1da177e4 LT |
1611 | * Wait for VBLANK. |
1612 | * | |
1613 | * \param inode device inode. | |
6c340eac | 1614 | * \param file_priv DRM file private. |
1da177e4 LT |
1615 | * \param cmd command. |
1616 | * \param data user argument, pointing to a drm_wait_vblank structure. | |
1617 | * \return zero on success or a negative number on failure. | |
1618 | * | |
30b23634 EA |
1619 | * This function enables the vblank interrupt on the pipe requested, then |
1620 | * sleeps waiting for the requested sequence number to occur, and drops | |
f5752b38 | 1621 | * the vblank interrupt refcount afterwards. (vblank IRQ disable follows that |
30b23634 | 1622 | * after a timeout with no further vblank waits scheduled). |
1da177e4 | 1623 | */ |
0a3e67a4 JB |
1624 | int drm_wait_vblank(struct drm_device *dev, void *data, |
1625 | struct drm_file *file_priv) | |
1da177e4 | 1626 | { |
8a51d5be | 1627 | struct drm_vblank_crtc *vblank; |
c153f45f | 1628 | union drm_wait_vblank *vblwait = data; |
4a1b0714 | 1629 | int ret; |
cc1ef118 | 1630 | unsigned int flags, seq, pipe, high_pipe; |
1da177e4 | 1631 | |
4984979b DV |
1632 | if (!dev->irq_enabled) |
1633 | return -EINVAL; | |
1da177e4 | 1634 | |
30b23634 EA |
1635 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) |
1636 | return -EINVAL; | |
1637 | ||
c153f45f | 1638 | if (vblwait->request.type & |
19b01b5f IH |
1639 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1640 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
776c9443 | 1641 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", |
c153f45f | 1642 | vblwait->request.type, |
19b01b5f IH |
1643 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1644 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
776c9443 MD |
1645 | return -EINVAL; |
1646 | } | |
1647 | ||
c153f45f | 1648 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
cc1ef118 TR |
1649 | high_pipe = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); |
1650 | if (high_pipe) | |
1651 | pipe = high_pipe >> _DRM_VBLANK_HIGH_CRTC_SHIFT; | |
19b01b5f | 1652 | else |
cc1ef118 TR |
1653 | pipe = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; |
1654 | if (pipe >= dev->num_crtcs) | |
776c9443 MD |
1655 | return -EINVAL; |
1656 | ||
cc1ef118 | 1657 | vblank = &dev->vblank[pipe]; |
8a51d5be | 1658 | |
cc1ef118 | 1659 | ret = drm_vblank_get(dev, pipe); |
0a3e67a4 | 1660 | if (ret) { |
8d3457ec | 1661 | DRM_DEBUG("failed to acquire vblank counter, %d\n", ret); |
0a3e67a4 JB |
1662 | return ret; |
1663 | } | |
cc1ef118 | 1664 | seq = drm_vblank_count(dev, pipe); |
776c9443 | 1665 | |
c153f45f | 1666 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
1da177e4 | 1667 | case _DRM_VBLANK_RELATIVE: |
c153f45f EA |
1668 | vblwait->request.sequence += seq; |
1669 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |
1da177e4 LT |
1670 | case _DRM_VBLANK_ABSOLUTE: |
1671 | break; | |
1672 | default: | |
0a3e67a4 JB |
1673 | ret = -EINVAL; |
1674 | goto done; | |
1da177e4 LT |
1675 | } |
1676 | ||
a6778e9e IH |
1677 | if (flags & _DRM_VBLANK_EVENT) { |
1678 | /* must hold on to the vblank ref until the event fires | |
1679 | * drm_vblank_put will be called asynchronously | |
1680 | */ | |
cc1ef118 | 1681 | return drm_queue_vblank_event(dev, pipe, vblwait, file_priv); |
a6778e9e | 1682 | } |
c9a9c5e0 | 1683 | |
ab285d74 | 1684 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
c153f45f EA |
1685 | (seq - vblwait->request.sequence) <= (1<<23)) { |
1686 | vblwait->request.sequence = seq + 1; | |
ab285d74 MD |
1687 | } |
1688 | ||
cc1ef118 TR |
1689 | DRM_DEBUG("waiting on vblank count %d, crtc %u\n", |
1690 | vblwait->request.sequence, pipe); | |
8a51d5be VS |
1691 | vblank->last_wait = vblwait->request.sequence; |
1692 | DRM_WAIT_ON(ret, vblank->queue, 3 * HZ, | |
cc1ef118 | 1693 | (((drm_vblank_count(dev, pipe) - |
30b23634 | 1694 | vblwait->request.sequence) <= (1 << 23)) || |
8a51d5be | 1695 | !vblank->enabled || |
30b23634 | 1696 | !dev->irq_enabled)); |
1da177e4 | 1697 | |
30b23634 EA |
1698 | if (ret != -EINTR) { |
1699 | struct timeval now; | |
1da177e4 | 1700 | |
cc1ef118 | 1701 | vblwait->reply.sequence = drm_vblank_count_and_time(dev, pipe, &now); |
30b23634 EA |
1702 | vblwait->reply.tval_sec = now.tv_sec; |
1703 | vblwait->reply.tval_usec = now.tv_usec; | |
27641c3f | 1704 | |
30b23634 EA |
1705 | DRM_DEBUG("returning %d to client\n", |
1706 | vblwait->reply.sequence); | |
1da177e4 | 1707 | } else { |
30b23634 | 1708 | DRM_DEBUG("vblank wait interrupted by signal\n"); |
1da177e4 LT |
1709 | } |
1710 | ||
0a3e67a4 | 1711 | done: |
cc1ef118 | 1712 | drm_vblank_put(dev, pipe); |
1da177e4 LT |
1713 | return ret; |
1714 | } | |
1715 | ||
cc1ef118 | 1716 | static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe) |
c9a9c5e0 KH |
1717 | { |
1718 | struct drm_pending_vblank_event *e, *t; | |
1719 | struct timeval now; | |
c9a9c5e0 KH |
1720 | unsigned int seq; |
1721 | ||
56cc279b | 1722 | assert_spin_locked(&dev->event_lock); |
c9a9c5e0 | 1723 | |
cc1ef118 | 1724 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
c9a9c5e0 KH |
1725 | |
1726 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
cc1ef118 | 1727 | if (e->pipe != pipe) |
c9a9c5e0 KH |
1728 | continue; |
1729 | if ((seq - e->event.sequence) > (1<<23)) | |
1730 | continue; | |
1731 | ||
1732 | DRM_DEBUG("vblank event on %d, current %d\n", | |
1733 | e->event.sequence, seq); | |
1734 | ||
c6eefa17 | 1735 | list_del(&e->base.link); |
cc1ef118 | 1736 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1737 | send_vblank_event(dev, e, seq, &now); |
c9a9c5e0 KH |
1738 | } |
1739 | ||
cc1ef118 | 1740 | trace_drm_vblank_event(pipe, seq); |
c9a9c5e0 KH |
1741 | } |
1742 | ||
0a3e67a4 JB |
1743 | /** |
1744 | * drm_handle_vblank - handle a vblank event | |
1745 | * @dev: DRM device | |
cc1ef118 | 1746 | * @pipe: index of CRTC where this event occurred |
0a3e67a4 JB |
1747 | * |
1748 | * Drivers should call this routine in their vblank interrupt handlers to | |
1749 | * update the vblank counter and send any signals that may be pending. | |
115ebcd4 TR |
1750 | * |
1751 | * This is the legacy version of drm_crtc_handle_vblank(). | |
0a3e67a4 | 1752 | */ |
cc1ef118 | 1753 | bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe) |
0a3e67a4 | 1754 | { |
cc1ef118 | 1755 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
27641c3f MK |
1756 | unsigned long irqflags; |
1757 | ||
ee3c7795 | 1758 | if (WARN_ON_ONCE(!dev->num_crtcs)) |
78c6e170 | 1759 | return false; |
c9a9c5e0 | 1760 | |
cc1ef118 | 1761 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1762 | return false; |
1763 | ||
56cc279b VS |
1764 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1765 | ||
27641c3f MK |
1766 | /* Need timestamp lock to prevent concurrent execution with |
1767 | * vblank enable/disable, as this would cause inconsistent | |
1768 | * or corrupted timestamps and vblank counts. | |
1769 | */ | |
56cc279b | 1770 | spin_lock(&dev->vblank_time_lock); |
27641c3f MK |
1771 | |
1772 | /* Vblank irq handling disabled. Nothing to do. */ | |
8a51d5be | 1773 | if (!vblank->enabled) { |
56cc279b VS |
1774 | spin_unlock(&dev->vblank_time_lock); |
1775 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
78c6e170 | 1776 | return false; |
27641c3f MK |
1777 | } |
1778 | ||
4dfd6486 | 1779 | drm_update_vblank_count(dev, pipe, DRM_CALLED_FROM_VBLIRQ); |
27641c3f | 1780 | |
56cc279b VS |
1781 | spin_unlock(&dev->vblank_time_lock); |
1782 | ||
8a51d5be | 1783 | wake_up(&vblank->queue); |
cc1ef118 | 1784 | drm_handle_vblank_events(dev, pipe); |
27641c3f | 1785 | |
56cc279b VS |
1786 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
1787 | ||
78c6e170 | 1788 | return true; |
0a3e67a4 JB |
1789 | } |
1790 | EXPORT_SYMBOL(drm_handle_vblank); | |
115ebcd4 TR |
1791 | |
1792 | /** | |
1793 | * drm_crtc_handle_vblank - handle a vblank event | |
1794 | * @crtc: where this event occurred | |
1795 | * | |
1796 | * Drivers should call this routine in their vblank interrupt handlers to | |
1797 | * update the vblank counter and send any signals that may be pending. | |
1798 | * | |
1799 | * This is the native KMS version of drm_handle_vblank(). | |
1800 | * | |
1801 | * Returns: | |
1802 | * True if the event was successfully handled, false on failure. | |
1803 | */ | |
1804 | bool drm_crtc_handle_vblank(struct drm_crtc *crtc) | |
1805 | { | |
1806 | return drm_handle_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1807 | } | |
1808 | EXPORT_SYMBOL(drm_crtc_handle_vblank); | |
b44f8408 VS |
1809 | |
1810 | /** | |
1811 | * drm_vblank_no_hw_counter - "No hw counter" implementation of .get_vblank_counter() | |
1812 | * @dev: DRM device | |
1813 | * @pipe: CRTC for which to read the counter | |
1814 | * | |
1815 | * Drivers can plug this into the .get_vblank_counter() function if | |
1816 | * there is no useable hardware frame counter available. | |
1817 | * | |
1818 | * Returns: | |
1819 | * 0 | |
1820 | */ | |
1821 | u32 drm_vblank_no_hw_counter(struct drm_device *dev, unsigned int pipe) | |
1822 | { | |
1823 | return 0; | |
1824 | } | |
1825 | EXPORT_SYMBOL(drm_vblank_no_hw_counter); |