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Commit | Line | Data |
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f5752b38 DV |
1 | /* |
2 | * drm_irq.c IRQ and vblank support | |
1da177e4 LT |
3 | * |
4 | * \author Rickard E. (Rik) Faith <faith@valinux.com> | |
5 | * \author Gareth Hughes <gareth@valinux.com> | |
6 | */ | |
7 | ||
8 | /* | |
9 | * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com | |
10 | * | |
11 | * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. | |
12 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. | |
13 | * All Rights Reserved. | |
14 | * | |
15 | * Permission is hereby granted, free of charge, to any person obtaining a | |
16 | * copy of this software and associated documentation files (the "Software"), | |
17 | * to deal in the Software without restriction, including without limitation | |
18 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
19 | * and/or sell copies of the Software, and to permit persons to whom the | |
20 | * Software is furnished to do so, subject to the following conditions: | |
21 | * | |
22 | * The above copyright notice and this permission notice (including the next | |
23 | * paragraph) shall be included in all copies or substantial portions of the | |
24 | * Software. | |
25 | * | |
26 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
27 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
28 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
29 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
30 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
31 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
32 | * OTHER DEALINGS IN THE SOFTWARE. | |
33 | */ | |
34 | ||
760285e7 | 35 | #include <drm/drmP.h> |
ac2874b9 | 36 | #include "drm_trace.h" |
18882995 | 37 | #include "drm_internal.h" |
1da177e4 LT |
38 | |
39 | #include <linux/interrupt.h> /* For task queue support */ | |
5a0e3ad6 | 40 | #include <linux/slab.h> |
1da177e4 | 41 | |
28d52043 | 42 | #include <linux/vgaarb.h> |
2d1a8a48 | 43 | #include <linux/export.h> |
27641c3f | 44 | |
27641c3f MK |
45 | /* Retry timestamp calculation up to 3 times to satisfy |
46 | * drm_timestamp_precision before giving up. | |
47 | */ | |
48 | #define DRM_TIMESTAMP_MAXRETRIES 3 | |
49 | ||
50 | /* Threshold in nanoseconds for detection of redundant | |
51 | * vblank irq in drm_handle_vblank(). 1 msec should be ok. | |
52 | */ | |
53 | #define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000 | |
54 | ||
fb446a1a | 55 | static bool |
cc1ef118 | 56 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, |
fb446a1a DV |
57 | struct timeval *tvblank, unsigned flags); |
58 | ||
18882995 DV |
59 | static unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */ |
60 | ||
61 | /* | |
62 | * Default to use monotonic timestamps for wait-for-vblank and page-flip | |
63 | * complete events. | |
64 | */ | |
65 | unsigned int drm_timestamp_monotonic = 1; | |
66 | ||
67 | static int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */ | |
68 | ||
69 | module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600); | |
70 | module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600); | |
71 | module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600); | |
d9d8c4cf DC |
72 | MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs] (0: never disable, <0: disable immediately)"); |
73 | MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]"); | |
74 | MODULE_PARM_DESC(timestamp_monotonic, "Use monotonic timestamps"); | |
18882995 | 75 | |
1da248a5 | 76 | static void store_vblank(struct drm_device *dev, unsigned int pipe, |
209e4dbc | 77 | u32 vblank_count_inc, |
4dfd6486 | 78 | struct timeval *t_vblank, u32 last) |
99264a61 | 79 | { |
1da248a5 | 80 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
99264a61 DV |
81 | |
82 | assert_spin_locked(&dev->vblank_time_lock); | |
83 | ||
4dfd6486 VS |
84 | vblank->last = last; |
85 | ||
d4055a9b MA |
86 | write_seqlock(&vblank->seqlock); |
87 | vblank->time = *t_vblank; | |
99264a61 | 88 | vblank->count += vblank_count_inc; |
d4055a9b | 89 | write_sequnlock(&vblank->seqlock); |
99264a61 DV |
90 | } |
91 | ||
5ac74757 SG |
92 | /* |
93 | * "No hw counter" fallback implementation of .get_vblank_counter() hook, | |
94 | * if there is no useable hardware frame counter available. | |
95 | */ | |
96 | static u32 drm_vblank_no_hw_counter(struct drm_device *dev, unsigned int pipe) | |
97 | { | |
98 | WARN_ON_ONCE(dev->max_vblank_count != 0); | |
99 | return 0; | |
100 | } | |
101 | ||
84e35483 SG |
102 | static u32 __get_vblank_counter(struct drm_device *dev, unsigned int pipe) |
103 | { | |
104 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
105 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
106 | ||
107 | if (crtc->funcs->get_vblank_counter) | |
108 | return crtc->funcs->get_vblank_counter(crtc); | |
109 | } | |
110 | ||
111 | if (dev->driver->get_vblank_counter) | |
112 | return dev->driver->get_vblank_counter(dev, pipe); | |
113 | ||
114 | return drm_vblank_no_hw_counter(dev, pipe); | |
115 | } | |
116 | ||
00edbe19 | 117 | /* |
4dfd6486 VS |
118 | * Reset the stored timestamp for the current vblank count to correspond |
119 | * to the last vblank occurred. | |
120 | * | |
2d1e331f | 121 | * Only to be called from drm_crtc_vblank_on(). |
4dfd6486 | 122 | * |
ef40cbf9 | 123 | * Note: caller must hold &drm_device.vbl_lock since this reads & writes |
4dfd6486 VS |
124 | * device vblank fields. |
125 | */ | |
126 | static void drm_reset_vblank_timestamp(struct drm_device *dev, unsigned int pipe) | |
127 | { | |
128 | u32 cur_vblank; | |
129 | bool rc; | |
130 | struct timeval t_vblank; | |
131 | int count = DRM_TIMESTAMP_MAXRETRIES; | |
132 | ||
133 | spin_lock(&dev->vblank_time_lock); | |
134 | ||
135 | /* | |
136 | * sample the current counter to avoid random jumps | |
137 | * when drm_vblank_enable() applies the diff | |
138 | */ | |
139 | do { | |
84e35483 | 140 | cur_vblank = __get_vblank_counter(dev, pipe); |
4dfd6486 | 141 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, 0); |
84e35483 | 142 | } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0); |
4dfd6486 VS |
143 | |
144 | /* | |
145 | * Only reinitialize corresponding vblank timestamp if high-precision query | |
146 | * available and didn't fail. Otherwise reinitialize delayed at next vblank | |
147 | * interrupt and assign 0 for now, to mark the vblanktimestamp as invalid. | |
148 | */ | |
149 | if (!rc) | |
150 | t_vblank = (struct timeval) {0, 0}; | |
151 | ||
152 | /* | |
153 | * +1 to make sure user will never see the same | |
154 | * vblank counter value before and after a modeset | |
155 | */ | |
156 | store_vblank(dev, pipe, 1, &t_vblank, cur_vblank); | |
157 | ||
158 | spin_unlock(&dev->vblank_time_lock); | |
159 | } | |
160 | ||
00edbe19 | 161 | /* |
13b030af | 162 | * Call back into the driver to update the appropriate vblank counter |
1da248a5 | 163 | * (specified by @pipe). Deal with wraparound, if it occurred, and |
13b030af VS |
164 | * update the last read value so we can deal with wraparound on the next |
165 | * call if necessary. | |
166 | * | |
167 | * Only necessary when going from off->on, to account for frames we | |
168 | * didn't get an interrupt for. | |
169 | * | |
ef40cbf9 | 170 | * Note: caller must hold &drm_device.vbl_lock since this reads & writes |
13b030af VS |
171 | * device vblank fields. |
172 | */ | |
a6e610dc VS |
173 | static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe, |
174 | unsigned long flags) | |
13b030af | 175 | { |
cc1ef118 | 176 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
99264a61 | 177 | u32 cur_vblank, diff; |
fb446a1a | 178 | bool rc; |
13b030af | 179 | struct timeval t_vblank; |
facfb062 | 180 | int count = DRM_TIMESTAMP_MAXRETRIES; |
4dfd6486 | 181 | int framedur_ns = vblank->framedur_ns; |
13b030af VS |
182 | |
183 | /* | |
184 | * Interrupts were disabled prior to this call, so deal with counter | |
185 | * wrap if needed. | |
5ceecb2f | 186 | * NOTE! It's possible we lost a full dev->max_vblank_count + 1 events |
13b030af VS |
187 | * here if the register is small or we had vblank interrupts off for |
188 | * a long time. | |
189 | * | |
190 | * We repeat the hardware vblank counter & timestamp query until | |
191 | * we get consistent results. This to prevent races between gpu | |
192 | * updating its hardware counter while we are retrieving the | |
193 | * corresponding vblank timestamp. | |
194 | */ | |
195 | do { | |
84e35483 | 196 | cur_vblank = __get_vblank_counter(dev, pipe); |
a6e610dc | 197 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, flags); |
84e35483 | 198 | } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0); |
13b030af | 199 | |
4dfd6486 VS |
200 | if (dev->max_vblank_count != 0) { |
201 | /* trust the hw counter when it's around */ | |
202 | diff = (cur_vblank - vblank->last) & dev->max_vblank_count; | |
203 | } else if (rc && framedur_ns) { | |
204 | const struct timeval *t_old; | |
205 | u64 diff_ns; | |
206 | ||
d4055a9b | 207 | t_old = &vblank->time; |
4dfd6486 | 208 | diff_ns = timeval_to_ns(&t_vblank) - timeval_to_ns(t_old); |
13b030af | 209 | |
4dfd6486 VS |
210 | /* |
211 | * Figure out how many vblanks we've missed based | |
212 | * on the difference in the timestamps and the | |
213 | * frame/field duration. | |
214 | */ | |
215 | diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns); | |
216 | ||
217 | if (diff == 0 && flags & DRM_CALLED_FROM_VBLIRQ) | |
235fabe0 VS |
218 | DRM_DEBUG_VBL("crtc %u: Redundant vblirq ignored." |
219 | " diff_ns = %lld, framedur_ns = %d)\n", | |
220 | pipe, (long long) diff_ns, framedur_ns); | |
4dfd6486 VS |
221 | } else { |
222 | /* some kind of default for drivers w/o accurate vbl timestamping */ | |
223 | diff = (flags & DRM_CALLED_FROM_VBLIRQ) != 0; | |
13b030af VS |
224 | } |
225 | ||
c61934ed MK |
226 | /* |
227 | * Within a drm_vblank_pre_modeset - drm_vblank_post_modeset | |
228 | * interval? If so then vblank irqs keep running and it will likely | |
229 | * happen that the hardware vblank counter is not trustworthy as it | |
230 | * might reset at some point in that interval and vblank timestamps | |
231 | * are not trustworthy either in that interval. Iow. this can result | |
232 | * in a bogus diff >> 1 which must be avoided as it would cause | |
233 | * random large forward jumps of the software vblank counter. | |
234 | */ | |
235 | if (diff > 1 && (vblank->inmodeset & 0x2)) { | |
236 | DRM_DEBUG_VBL("clamping vblank bump to 1 on crtc %u: diffr=%u" | |
237 | " due to pre-modeset.\n", pipe, diff); | |
238 | diff = 1; | |
239 | } | |
240 | ||
235fabe0 VS |
241 | DRM_DEBUG_VBL("updating vblank count on crtc %u:" |
242 | " current=%u, diff=%u, hw=%u hw_last=%u\n", | |
243 | pipe, vblank->count, diff, cur_vblank, vblank->last); | |
13b030af | 244 | |
4dfd6486 VS |
245 | if (diff == 0) { |
246 | WARN_ON_ONCE(cur_vblank != vblank->last); | |
da8f4396 | 247 | return; |
4dfd6486 | 248 | } |
da8f4396 | 249 | |
99264a61 DV |
250 | /* |
251 | * Only reinitialize corresponding vblank timestamp if high-precision query | |
fa4270d8 VS |
252 | * available and didn't fail, or we were called from the vblank interrupt. |
253 | * Otherwise reinitialize delayed at next vblank interrupt and assign 0 | |
254 | * for now, to mark the vblanktimestamp as invalid. | |
13b030af | 255 | */ |
fa4270d8 | 256 | if (!rc && (flags & DRM_CALLED_FROM_VBLIRQ) == 0) |
d66a1e38 MK |
257 | t_vblank = (struct timeval) {0, 0}; |
258 | ||
4dfd6486 | 259 | store_vblank(dev, pipe, diff, &t_vblank, cur_vblank); |
13b030af VS |
260 | } |
261 | ||
d6b0f626 DV |
262 | static u32 drm_vblank_count(struct drm_device *dev, unsigned int pipe) |
263 | { | |
264 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
265 | ||
266 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
267 | return 0; | |
268 | ||
269 | return vblank->count; | |
270 | } | |
271 | ||
af61d5ce ML |
272 | /** |
273 | * drm_accurate_vblank_count - retrieve the master vblank counter | |
274 | * @crtc: which counter to retrieve | |
275 | * | |
276 | * This function is similar to @drm_crtc_vblank_count but this | |
277 | * function interpolates to handle a race with vblank irq's. | |
278 | * | |
279 | * This is mostly useful for hardware that can obtain the scanout | |
280 | * position, but doesn't have a frame counter. | |
281 | */ | |
282 | u32 drm_accurate_vblank_count(struct drm_crtc *crtc) | |
283 | { | |
284 | struct drm_device *dev = crtc->dev; | |
285 | unsigned int pipe = drm_crtc_index(crtc); | |
286 | u32 vblank; | |
287 | unsigned long flags; | |
288 | ||
289 | WARN(!dev->driver->get_vblank_timestamp, | |
290 | "This function requires support for accurate vblank timestamps."); | |
291 | ||
292 | spin_lock_irqsave(&dev->vblank_time_lock, flags); | |
293 | ||
294 | drm_update_vblank_count(dev, pipe, 0); | |
295 | vblank = drm_vblank_count(dev, pipe); | |
296 | ||
297 | spin_unlock_irqrestore(&dev->vblank_time_lock, flags); | |
298 | ||
299 | return vblank; | |
300 | } | |
301 | EXPORT_SYMBOL(drm_accurate_vblank_count); | |
302 | ||
84e35483 SG |
303 | static void __disable_vblank(struct drm_device *dev, unsigned int pipe) |
304 | { | |
305 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
306 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
307 | ||
308 | if (crtc->funcs->disable_vblank) { | |
309 | crtc->funcs->disable_vblank(crtc); | |
310 | return; | |
311 | } | |
312 | } | |
313 | ||
314 | dev->driver->disable_vblank(dev, pipe); | |
315 | } | |
316 | ||
27641c3f MK |
317 | /* |
318 | * Disable vblank irq's on crtc, make sure that last vblank count | |
319 | * of hardware and corresponding consistent software vblank counter | |
320 | * are preserved, even if there are any spurious vblank irq's after | |
321 | * disable. | |
322 | */ | |
cc1ef118 | 323 | static void vblank_disable_and_save(struct drm_device *dev, unsigned int pipe) |
27641c3f | 324 | { |
cc1ef118 | 325 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
27641c3f | 326 | unsigned long irqflags; |
27641c3f | 327 | |
43dc7fe2 CW |
328 | assert_spin_locked(&dev->vbl_lock); |
329 | ||
27641c3f MK |
330 | /* Prevent vblank irq processing while disabling vblank irqs, |
331 | * so no updates of timestamps or count can happen after we've | |
332 | * disabled. Needed to prevent races in case of delayed irq's. | |
27641c3f | 333 | */ |
27641c3f MK |
334 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); |
335 | ||
eb2ed66f LP |
336 | /* |
337 | * Only disable vblank interrupts if they're enabled. This avoids | |
338 | * calling the ->disable_vblank() operation in atomic context with the | |
339 | * hardware potentially runtime suspended. | |
340 | */ | |
f5f4c615 | 341 | if (vblank->enabled) { |
84e35483 | 342 | __disable_vblank(dev, pipe); |
f5f4c615 CW |
343 | vblank->enabled = false; |
344 | } | |
27641c3f | 345 | |
4dfd6486 VS |
346 | /* |
347 | * Always update the count and timestamp to maintain the | |
348 | * appearance that the counter has been ticking all along until | |
349 | * this time. This makes the count account for the entire time | |
2d1e331f | 350 | * between drm_crtc_vblank_on() and drm_crtc_vblank_off(). |
27641c3f | 351 | */ |
4dfd6486 | 352 | drm_update_vblank_count(dev, pipe, 0); |
27641c3f | 353 | |
27641c3f | 354 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); |
27641c3f MK |
355 | } |
356 | ||
0a3e67a4 JB |
357 | static void vblank_disable_fn(unsigned long arg) |
358 | { | |
e69595c2 VS |
359 | struct drm_vblank_crtc *vblank = (void *)arg; |
360 | struct drm_device *dev = vblank->dev; | |
cc1ef118 | 361 | unsigned int pipe = vblank->pipe; |
0a3e67a4 | 362 | unsigned long irqflags; |
0a3e67a4 | 363 | |
e69595c2 VS |
364 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
365 | if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) { | |
cc1ef118 TR |
366 | DRM_DEBUG("disabling vblank on crtc %u\n", pipe); |
367 | vblank_disable_and_save(dev, pipe); | |
0a3e67a4 | 368 | } |
e69595c2 | 369 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
0a3e67a4 JB |
370 | } |
371 | ||
f5752b38 DV |
372 | /** |
373 | * drm_vblank_cleanup - cleanup vblank support | |
374 | * @dev: DRM device | |
375 | * | |
376 | * This function cleans up any resources allocated in drm_vblank_init. | |
377 | */ | |
52440211 | 378 | void drm_vblank_cleanup(struct drm_device *dev) |
0a3e67a4 | 379 | { |
cc1ef118 | 380 | unsigned int pipe; |
e69595c2 | 381 | |
0a3e67a4 JB |
382 | /* Bail if the driver didn't call drm_vblank_init() */ |
383 | if (dev->num_crtcs == 0) | |
384 | return; | |
385 | ||
cc1ef118 TR |
386 | for (pipe = 0; pipe < dev->num_crtcs; pipe++) { |
387 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
8a51d5be | 388 | |
43dc7fe2 | 389 | WARN_ON(READ_ONCE(vblank->enabled) && |
3bff93d6 | 390 | drm_core_check_feature(dev, DRIVER_MODESET)); |
2368ffb1 | 391 | |
3bff93d6 | 392 | del_timer_sync(&vblank->disable_timer); |
e69595c2 | 393 | } |
0a3e67a4 | 394 | |
5380e929 | 395 | kfree(dev->vblank); |
0a3e67a4 JB |
396 | |
397 | dev->num_crtcs = 0; | |
398 | } | |
e77cef9c | 399 | EXPORT_SYMBOL(drm_vblank_cleanup); |
0a3e67a4 | 400 | |
f5752b38 DV |
401 | /** |
402 | * drm_vblank_init - initialize vblank support | |
cc1ef118 TR |
403 | * @dev: DRM device |
404 | * @num_crtcs: number of CRTCs supported by @dev | |
f5752b38 DV |
405 | * |
406 | * This function initializes vblank support for @num_crtcs display pipelines. | |
407 | * | |
408 | * Returns: | |
409 | * Zero on success or a negative error code on failure. | |
410 | */ | |
cc1ef118 | 411 | int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs) |
0a3e67a4 | 412 | { |
cc1ef118 TR |
413 | int ret = -ENOMEM; |
414 | unsigned int i; | |
0a3e67a4 | 415 | |
0a3e67a4 | 416 | spin_lock_init(&dev->vbl_lock); |
27641c3f MK |
417 | spin_lock_init(&dev->vblank_time_lock); |
418 | ||
0a3e67a4 JB |
419 | dev->num_crtcs = num_crtcs; |
420 | ||
5380e929 VS |
421 | dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL); |
422 | if (!dev->vblank) | |
0a3e67a4 JB |
423 | goto err; |
424 | ||
e69595c2 | 425 | for (i = 0; i < num_crtcs; i++) { |
8a51d5be VS |
426 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
427 | ||
428 | vblank->dev = dev; | |
cc1ef118 | 429 | vblank->pipe = i; |
8a51d5be VS |
430 | init_waitqueue_head(&vblank->queue); |
431 | setup_timer(&vblank->disable_timer, vblank_disable_fn, | |
432 | (unsigned long)vblank); | |
d4055a9b | 433 | seqlock_init(&vblank->seqlock); |
e69595c2 | 434 | } |
27641c3f | 435 | |
8f6fce03 | 436 | DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n"); |
27641c3f MK |
437 | |
438 | /* Driver specific high-precision vblank timestamping supported? */ | |
439 | if (dev->driver->get_vblank_timestamp) | |
440 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); | |
441 | else | |
442 | DRM_INFO("No driver support for vblank timestamp query.\n"); | |
443 | ||
5a8b21b2 MK |
444 | /* Must have precise timestamping for reliable vblank instant disable */ |
445 | if (dev->vblank_disable_immediate && !dev->driver->get_vblank_timestamp) { | |
446 | dev->vblank_disable_immediate = false; | |
447 | DRM_INFO("Setting vblank_disable_immediate to false because " | |
448 | "get_vblank_timestamp == NULL\n"); | |
449 | } | |
450 | ||
0a3e67a4 JB |
451 | return 0; |
452 | ||
453 | err: | |
79a093ae | 454 | dev->num_crtcs = 0; |
0a3e67a4 JB |
455 | return ret; |
456 | } | |
457 | EXPORT_SYMBOL(drm_vblank_init); | |
458 | ||
1da177e4 | 459 | /** |
f5752b38 DV |
460 | * drm_irq_install - install IRQ handler |
461 | * @dev: DRM device | |
462 | * @irq: IRQ number to install the handler for | |
1da177e4 | 463 | * |
0a3e67a4 | 464 | * Initializes the IRQ related data. Installs the handler, calling the driver |
f5752b38 DV |
465 | * irq_preinstall() and irq_postinstall() functions before and after the |
466 | * installation. | |
467 | * | |
468 | * This is the simplified helper interface provided for drivers with no special | |
469 | * needs. Drivers which need to install interrupt handlers for multiple | |
ef40cbf9 | 470 | * interrupts must instead set &drm_device.irq_enabled to signal the DRM core |
f5752b38 DV |
471 | * that vblank interrupts are available. |
472 | * | |
473 | * Returns: | |
474 | * Zero on success or a negative error code on failure. | |
1da177e4 | 475 | */ |
bb0f1b5c | 476 | int drm_irq_install(struct drm_device *dev, int irq) |
1da177e4 | 477 | { |
4a1b0714 | 478 | int ret; |
b5e89ed5 | 479 | unsigned long sh_flags = 0; |
1da177e4 LT |
480 | |
481 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
482 | return -EINVAL; | |
483 | ||
7c1a38e3 | 484 | if (irq == 0) |
1da177e4 LT |
485 | return -EINVAL; |
486 | ||
1da177e4 | 487 | /* Driver must have been initialized */ |
e090c53b | 488 | if (!dev->dev_private) |
1da177e4 | 489 | return -EINVAL; |
1da177e4 | 490 | |
e090c53b | 491 | if (dev->irq_enabled) |
1da177e4 | 492 | return -EBUSY; |
4423843c | 493 | dev->irq_enabled = true; |
1da177e4 | 494 | |
7c1a38e3 | 495 | DRM_DEBUG("irq=%d\n", irq); |
1da177e4 | 496 | |
b5e89ed5 | 497 | /* Before installing handler */ |
5037f8ac JS |
498 | if (dev->driver->irq_preinstall) |
499 | dev->driver->irq_preinstall(dev); | |
1da177e4 | 500 | |
b5e89ed5 | 501 | /* Install handler */ |
1da177e4 | 502 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
935f6e3a | 503 | sh_flags = IRQF_SHARED; |
b5e89ed5 | 504 | |
7c1a38e3 | 505 | ret = request_irq(irq, dev->driver->irq_handler, |
5829d183 | 506 | sh_flags, dev->driver->name, dev); |
9bfbd5cb | 507 | |
b5e89ed5 | 508 | if (ret < 0) { |
4423843c | 509 | dev->irq_enabled = false; |
1da177e4 LT |
510 | return ret; |
511 | } | |
512 | ||
b5e89ed5 | 513 | /* After installing handler */ |
5037f8ac JS |
514 | if (dev->driver->irq_postinstall) |
515 | ret = dev->driver->irq_postinstall(dev); | |
516 | ||
0a3e67a4 | 517 | if (ret < 0) { |
4423843c | 518 | dev->irq_enabled = false; |
fa538645 | 519 | if (drm_core_check_feature(dev, DRIVER_LEGACY)) |
e1c44acc | 520 | vga_client_register(dev->pdev, NULL, NULL, NULL); |
7c1a38e3 DV |
521 | free_irq(irq, dev); |
522 | } else { | |
523 | dev->irq = irq; | |
0a3e67a4 | 524 | } |
1da177e4 | 525 | |
0a3e67a4 | 526 | return ret; |
1da177e4 | 527 | } |
0a3e67a4 | 528 | EXPORT_SYMBOL(drm_irq_install); |
1da177e4 LT |
529 | |
530 | /** | |
f5752b38 DV |
531 | * drm_irq_uninstall - uninstall the IRQ handler |
532 | * @dev: DRM device | |
533 | * | |
534 | * Calls the driver's irq_uninstall() function and unregisters the IRQ handler. | |
535 | * This should only be called by drivers which used drm_irq_install() to set up | |
536 | * their interrupt handler. Other drivers must only reset | |
ef40cbf9 | 537 | * &drm_device.irq_enabled to false. |
1da177e4 | 538 | * |
f5752b38 DV |
539 | * Note that for kernel modesetting drivers it is a bug if this function fails. |
540 | * The sanity checks are only to catch buggy user modesetting drivers which call | |
541 | * the same function through an ioctl. | |
1da177e4 | 542 | * |
f5752b38 DV |
543 | * Returns: |
544 | * Zero on success or a negative error code on failure. | |
1da177e4 | 545 | */ |
27641c3f | 546 | int drm_irq_uninstall(struct drm_device *dev) |
1da177e4 | 547 | { |
dc1336ff | 548 | unsigned long irqflags; |
4423843c VS |
549 | bool irq_enabled; |
550 | int i; | |
1da177e4 LT |
551 | |
552 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
553 | return -EINVAL; | |
554 | ||
1da177e4 | 555 | irq_enabled = dev->irq_enabled; |
4423843c | 556 | dev->irq_enabled = false; |
1da177e4 | 557 | |
dc1336ff | 558 | /* |
3bff93d6 | 559 | * Wake up any waiters so they don't hang. This is just to paper over |
c78d1ca2 | 560 | * issues for UMS drivers which aren't in full control of their |
3bff93d6 DV |
561 | * vblank/irq handling. KMS drivers must ensure that vblanks are all |
562 | * disabled when uninstalling the irq handler. | |
dc1336ff | 563 | */ |
bde4889a BS |
564 | if (dev->num_crtcs) { |
565 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
566 | for (i = 0; i < dev->num_crtcs; i++) { | |
8a51d5be VS |
567 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
568 | ||
3bff93d6 DV |
569 | if (!vblank->enabled) |
570 | continue; | |
571 | ||
572 | WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET)); | |
573 | ||
574 | vblank_disable_and_save(dev, i); | |
8a51d5be | 575 | wake_up(&vblank->queue); |
bde4889a BS |
576 | } |
577 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
dc1336ff | 578 | } |
dc1336ff | 579 | |
b5e89ed5 | 580 | if (!irq_enabled) |
1da177e4 LT |
581 | return -EINVAL; |
582 | ||
7c1a38e3 | 583 | DRM_DEBUG("irq=%d\n", dev->irq); |
1da177e4 | 584 | |
fa538645 | 585 | if (drm_core_check_feature(dev, DRIVER_LEGACY)) |
28d52043 DA |
586 | vga_client_register(dev->pdev, NULL, NULL, NULL); |
587 | ||
5037f8ac JS |
588 | if (dev->driver->irq_uninstall) |
589 | dev->driver->irq_uninstall(dev); | |
1da177e4 | 590 | |
7c1a38e3 | 591 | free_irq(dev->irq, dev); |
1da177e4 LT |
592 | |
593 | return 0; | |
594 | } | |
595 | EXPORT_SYMBOL(drm_irq_uninstall); | |
596 | ||
25a9939c DV |
597 | int drm_legacy_irq_control(struct drm_device *dev, void *data, |
598 | struct drm_file *file_priv) | |
1da177e4 | 599 | { |
c153f45f | 600 | struct drm_control *ctl = data; |
a319c1a4 | 601 | int ret = 0, irq; |
b5e89ed5 | 602 | |
27641c3f MK |
603 | /* if we haven't irq we fallback for compatibility reasons - |
604 | * this used to be a separate function in drm_dma.h | |
605 | */ | |
1da177e4 | 606 | |
22471cf6 DV |
607 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
608 | return 0; | |
fa538645 | 609 | if (!drm_core_check_feature(dev, DRIVER_LEGACY)) |
22471cf6 | 610 | return 0; |
c78d1ca2 | 611 | /* UMS was only ever supported on pci devices. */ |
22471cf6 DV |
612 | if (WARN_ON(!dev->pdev)) |
613 | return -EINVAL; | |
1da177e4 | 614 | |
c153f45f | 615 | switch (ctl->func) { |
1da177e4 | 616 | case DRM_INST_HANDLER: |
a319c1a4 DV |
617 | irq = dev->pdev->irq; |
618 | ||
1da177e4 | 619 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
a319c1a4 | 620 | ctl->irq != irq) |
1da177e4 | 621 | return -EINVAL; |
e090c53b | 622 | mutex_lock(&dev->struct_mutex); |
bb0f1b5c | 623 | ret = drm_irq_install(dev, irq); |
e090c53b DV |
624 | mutex_unlock(&dev->struct_mutex); |
625 | ||
626 | return ret; | |
1da177e4 | 627 | case DRM_UNINST_HANDLER: |
e090c53b DV |
628 | mutex_lock(&dev->struct_mutex); |
629 | ret = drm_irq_uninstall(dev); | |
630 | mutex_unlock(&dev->struct_mutex); | |
631 | ||
632 | return ret; | |
1da177e4 LT |
633 | default: |
634 | return -EINVAL; | |
635 | } | |
636 | } | |
637 | ||
27641c3f | 638 | /** |
f5752b38 DV |
639 | * drm_calc_timestamping_constants - calculate vblank timestamp constants |
640 | * @crtc: drm_crtc whose timestamp constants should be updated. | |
641 | * @mode: display mode containing the scanout timings | |
27641c3f | 642 | * |
21b21560 VS |
643 | * Calculate and store various constants which are later |
644 | * needed by vblank and swap-completion timestamping, e.g, | |
645 | * by drm_calc_vbltimestamp_from_scanoutpos(). They are | |
f5752b38 | 646 | * derived from CRTC's true scanout timing, so they take |
21b21560 | 647 | * things like panel scaling or other adjustments into account. |
27641c3f | 648 | */ |
545cdd55 VS |
649 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, |
650 | const struct drm_display_mode *mode) | |
27641c3f | 651 | { |
0c545ac4 VS |
652 | struct drm_device *dev = crtc->dev; |
653 | unsigned int pipe = drm_crtc_index(crtc); | |
654 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
20b20203 | 655 | int linedur_ns = 0, framedur_ns = 0; |
77666b72 | 656 | int dotclock = mode->crtc_clock; |
27641c3f | 657 | |
0c545ac4 VS |
658 | if (!dev->num_crtcs) |
659 | return; | |
660 | ||
661 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
662 | return; | |
663 | ||
27641c3f MK |
664 | /* Valid dotclock? */ |
665 | if (dotclock > 0) { | |
0dae35a3 VS |
666 | int frame_size = mode->crtc_htotal * mode->crtc_vtotal; |
667 | ||
668 | /* | |
669 | * Convert scanline length in pixels and video | |
20b20203 VS |
670 | * dot clock to line duration and frame duration |
671 | * in nanoseconds: | |
27641c3f | 672 | */ |
0dae35a3 VS |
673 | linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock); |
674 | framedur_ns = div_u64((u64) frame_size * 1000000, dotclock); | |
c0ae24c1 VS |
675 | |
676 | /* | |
677 | * Fields of interlaced scanout modes are only half a frame duration. | |
678 | */ | |
679 | if (mode->flags & DRM_MODE_FLAG_INTERLACE) | |
680 | framedur_ns /= 2; | |
27641c3f | 681 | } else |
cc1ef118 | 682 | DRM_ERROR("crtc %u: Can't calculate constants, dotclock = 0!\n", |
27641c3f MK |
683 | crtc->base.id); |
684 | ||
eba1f35d VS |
685 | vblank->linedur_ns = linedur_ns; |
686 | vblank->framedur_ns = framedur_ns; | |
27641c3f | 687 | |
cc1ef118 | 688 | DRM_DEBUG("crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n", |
545cdd55 VS |
689 | crtc->base.id, mode->crtc_htotal, |
690 | mode->crtc_vtotal, mode->crtc_vdisplay); | |
20b20203 VS |
691 | DRM_DEBUG("crtc %u: clock %d kHz framedur %d linedur %d\n", |
692 | crtc->base.id, dotclock, framedur_ns, linedur_ns); | |
27641c3f MK |
693 | } |
694 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
695 | ||
696 | /** | |
f5752b38 DV |
697 | * drm_calc_vbltimestamp_from_scanoutpos - precise vblank timestamp helper |
698 | * @dev: DRM device | |
cc1ef118 | 699 | * @pipe: index of CRTC whose vblank timestamp to retrieve |
f5752b38 DV |
700 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) |
701 | * On return contains true maximum error of timestamp | |
702 | * @vblank_time: Pointer to struct timeval which should receive the timestamp | |
703 | * @flags: Flags to pass to driver: | |
704 | * 0 = Default, | |
705 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
f5752b38 DV |
706 | * @mode: mode which defines the scanout timings |
707 | * | |
708 | * Implements calculation of exact vblank timestamps from given drm_display_mode | |
709 | * timings and current video scanout position of a CRTC. This can be called from | |
710 | * within get_vblank_timestamp() implementation of a kms driver to implement the | |
711 | * actual timestamping. | |
27641c3f MK |
712 | * |
713 | * Should return timestamps conforming to the OML_sync_control OpenML | |
714 | * extension specification. The timestamp corresponds to the end of | |
715 | * the vblank interval, aka start of scanout of topmost-leftmost display | |
716 | * pixel in the following video frame. | |
717 | * | |
718 | * Requires support for optional dev->driver->get_scanout_position() | |
719 | * in kms driver, plus a bit of setup code to provide a drm_display_mode | |
720 | * that corresponds to the true scanout timing. | |
721 | * | |
722 | * The current implementation only handles standard video modes. It | |
723 | * returns as no operation if a doublescan or interlaced video mode is | |
724 | * active. Higher level code is expected to handle this. | |
725 | * | |
f5752b38 DV |
726 | * Returns: |
727 | * Negative value on error, failure or if not supported in current | |
27641c3f MK |
728 | * video mode: |
729 | * | |
62cacc79 DV |
730 | * -EINVAL Invalid CRTC. |
731 | * -EAGAIN Temporary unavailable, e.g., called before initial modeset. | |
732 | * -ENOTSUPP Function not supported in current display mode. | |
733 | * -EIO Failed, e.g., due to failed scanout position query. | |
27641c3f MK |
734 | * |
735 | * Returns or'ed positive status flags on success: | |
736 | * | |
737 | * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping. | |
738 | * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval. | |
739 | * | |
740 | */ | |
cc1ef118 TR |
741 | int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, |
742 | unsigned int pipe, | |
27641c3f MK |
743 | int *max_error, |
744 | struct timeval *vblank_time, | |
745 | unsigned flags, | |
7da903ef | 746 | const struct drm_display_mode *mode) |
27641c3f | 747 | { |
e62f2f5a | 748 | struct timeval tv_etime; |
d2cb58c8 | 749 | ktime_t stime, etime; |
ad1716ec VS |
750 | unsigned int vbl_status; |
751 | int ret = DRM_VBLANKTIME_SCANOUTPOS_METHOD; | |
27641c3f | 752 | int vpos, hpos, i; |
3bb403bf | 753 | int delta_ns, duration_ns; |
27641c3f | 754 | |
cc1ef118 TR |
755 | if (pipe >= dev->num_crtcs) { |
756 | DRM_ERROR("Invalid crtc %u\n", pipe); | |
27641c3f MK |
757 | return -EINVAL; |
758 | } | |
759 | ||
760 | /* Scanout position query not supported? Should not happen. */ | |
761 | if (!dev->driver->get_scanout_position) { | |
762 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); | |
763 | return -EIO; | |
764 | } | |
765 | ||
27641c3f MK |
766 | /* If mode timing undefined, just return as no-op: |
767 | * Happens during initial modesetting of a crtc. | |
768 | */ | |
3bb403bf | 769 | if (mode->crtc_clock == 0) { |
cc1ef118 | 770 | DRM_DEBUG("crtc %u: Noop due to uninitialized mode.\n", pipe); |
27641c3f MK |
771 | return -EAGAIN; |
772 | } | |
773 | ||
27641c3f MK |
774 | /* Get current scanout position with system timestamp. |
775 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
776 | * if single query takes longer than max_error nanoseconds. | |
777 | * | |
778 | * This guarantees a tight bound on maximum error if | |
779 | * code gets preempted or delayed for some reason. | |
780 | */ | |
781 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
8f6fce03 MK |
782 | /* |
783 | * Get vertical and horizontal scanout position vpos, hpos, | |
784 | * and bounding timestamps stime, etime, pre/post query. | |
785 | */ | |
3bb403bf VS |
786 | vbl_status = dev->driver->get_scanout_position(dev, pipe, flags, |
787 | &vpos, &hpos, | |
788 | &stime, &etime, | |
789 | mode); | |
27641c3f | 790 | |
27641c3f MK |
791 | /* Return as no-op if scanout query unsupported or failed. */ |
792 | if (!(vbl_status & DRM_SCANOUTPOS_VALID)) { | |
ad1716ec | 793 | DRM_DEBUG("crtc %u : scanoutpos query failed [0x%x].\n", |
cc1ef118 | 794 | pipe, vbl_status); |
27641c3f MK |
795 | return -EIO; |
796 | } | |
797 | ||
8f6fce03 | 798 | /* Compute uncertainty in timestamp of scanout position query. */ |
e62f2f5a | 799 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); |
27641c3f MK |
800 | |
801 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
3c184f69 | 802 | if (duration_ns <= *max_error) |
27641c3f MK |
803 | break; |
804 | } | |
805 | ||
806 | /* Noisy system timing? */ | |
807 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
cc1ef118 TR |
808 | DRM_DEBUG("crtc %u: Noisy timestamp %d us > %d us [%d reps].\n", |
809 | pipe, duration_ns/1000, *max_error/1000, i); | |
27641c3f MK |
810 | } |
811 | ||
812 | /* Return upper bound of timestamp precision error. */ | |
3c184f69 | 813 | *max_error = duration_ns; |
27641c3f | 814 | |
27641c3f MK |
815 | /* Convert scanout position into elapsed time at raw_time query |
816 | * since start of scanout at first display scanline. delta_ns | |
817 | * can be negative if start of scanout hasn't happened yet. | |
818 | */ | |
3bb403bf VS |
819 | delta_ns = div_s64(1000000LL * (vpos * mode->crtc_htotal + hpos), |
820 | mode->crtc_clock); | |
27641c3f | 821 | |
c61eef72 | 822 | if (!drm_timestamp_monotonic) |
d2cb58c8 | 823 | etime = ktime_mono_to_real(etime); |
c61eef72 | 824 | |
e62f2f5a ID |
825 | /* save this only for debugging purposes */ |
826 | tv_etime = ktime_to_timeval(etime); | |
27641c3f MK |
827 | /* Subtract time delta from raw timestamp to get final |
828 | * vblank_time timestamp for end of vblank. | |
829 | */ | |
a91d7b91 | 830 | etime = ktime_sub_ns(etime, delta_ns); |
e62f2f5a | 831 | *vblank_time = ktime_to_timeval(etime); |
27641c3f | 832 | |
235fabe0 VS |
833 | DRM_DEBUG_VBL("crtc %u : v 0x%x p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n", |
834 | pipe, vbl_status, hpos, vpos, | |
835 | (long)tv_etime.tv_sec, (long)tv_etime.tv_usec, | |
836 | (long)vblank_time->tv_sec, (long)vblank_time->tv_usec, | |
837 | duration_ns/1000, i); | |
27641c3f | 838 | |
ad1716ec | 839 | return ret; |
27641c3f MK |
840 | } |
841 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); | |
842 | ||
c61eef72 ID |
843 | static struct timeval get_drm_timestamp(void) |
844 | { | |
845 | ktime_t now; | |
846 | ||
d2cb58c8 | 847 | now = drm_timestamp_monotonic ? ktime_get() : ktime_get_real(); |
c61eef72 ID |
848 | return ktime_to_timeval(now); |
849 | } | |
850 | ||
27641c3f MK |
851 | /** |
852 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
4dfd909f | 853 | * vblank interval |
27641c3f | 854 | * @dev: DRM device |
cc1ef118 | 855 | * @pipe: index of CRTC whose vblank timestamp to retrieve |
27641c3f MK |
856 | * @tvblank: Pointer to target struct timeval which should receive the timestamp |
857 | * @flags: Flags to pass to driver: | |
f5752b38 DV |
858 | * 0 = Default, |
859 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
27641c3f MK |
860 | * |
861 | * Fetches the system timestamp corresponding to the time of the most recent | |
f5752b38 | 862 | * vblank interval on specified CRTC. May call into kms-driver to |
27641c3f MK |
863 | * compute the timestamp with a high-precision GPU specific method. |
864 | * | |
865 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
866 | * call, i.e., it isn't very precisely locked to the true vblank. | |
867 | * | |
f5752b38 | 868 | * Returns: |
fb446a1a | 869 | * True if timestamp is considered to be very precise, false otherwise. |
27641c3f | 870 | */ |
fb446a1a | 871 | static bool |
cc1ef118 | 872 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, |
fb446a1a | 873 | struct timeval *tvblank, unsigned flags) |
27641c3f | 874 | { |
4a1b0714 | 875 | int ret; |
27641c3f MK |
876 | |
877 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
878 | int max_error = (int) drm_timestamp_precision * 1000; | |
879 | ||
880 | /* Query driver if possible and precision timestamping enabled. */ | |
881 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) { | |
cc1ef118 | 882 | ret = dev->driver->get_vblank_timestamp(dev, pipe, &max_error, |
27641c3f MK |
883 | tvblank, flags); |
884 | if (ret > 0) | |
fb446a1a | 885 | return true; |
27641c3f MK |
886 | } |
887 | ||
888 | /* GPU high precision timestamp query unsupported or failed. | |
c61eef72 | 889 | * Return current monotonic/gettimeofday timestamp as best estimate. |
27641c3f | 890 | */ |
c61eef72 | 891 | *tvblank = get_drm_timestamp(); |
27641c3f | 892 | |
fb446a1a | 893 | return false; |
27641c3f | 894 | } |
27641c3f | 895 | |
96d3f91e TR |
896 | /** |
897 | * drm_crtc_vblank_count - retrieve "cooked" vblank counter value | |
898 | * @crtc: which counter to retrieve | |
899 | * | |
900 | * Fetches the "cooked" vblank count value that represents the number of | |
901 | * vblank events since the system was booted, including lost events due to | |
902 | * modesetting activity. | |
903 | * | |
96d3f91e TR |
904 | * Returns: |
905 | * The software vblank counter. | |
906 | */ | |
907 | u32 drm_crtc_vblank_count(struct drm_crtc *crtc) | |
908 | { | |
909 | return drm_vblank_count(crtc->dev, drm_crtc_index(crtc)); | |
910 | } | |
911 | EXPORT_SYMBOL(drm_crtc_vblank_count); | |
912 | ||
27641c3f | 913 | /** |
cc1ef118 TR |
914 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value and the |
915 | * system timestamp corresponding to that vblank counter value. | |
27641c3f | 916 | * @dev: DRM device |
cc1ef118 | 917 | * @pipe: index of CRTC whose counter to retrieve |
27641c3f MK |
918 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. |
919 | * | |
920 | * Fetches the "cooked" vblank count value that represents the number of | |
921 | * vblank events since the system was booted, including lost events due to | |
922 | * modesetting activity. Returns corresponding system timestamp of the time | |
f5752b38 | 923 | * of the vblank interval that corresponds to the current vblank counter value. |
cf648305 TR |
924 | * |
925 | * This is the legacy version of drm_crtc_vblank_count_and_time(). | |
27641c3f | 926 | */ |
6e5f73fc GP |
927 | static u32 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe, |
928 | struct timeval *vblanktime) | |
27641c3f | 929 | { |
cc1ef118 | 930 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
d4055a9b MA |
931 | u32 vblank_count; |
932 | unsigned int seq; | |
27641c3f | 933 | |
cff52e5f AB |
934 | if (WARN_ON(pipe >= dev->num_crtcs)) { |
935 | *vblanktime = (struct timeval) { 0 }; | |
e6ae8687 | 936 | return 0; |
cff52e5f | 937 | } |
e6ae8687 | 938 | |
27641c3f | 939 | do { |
d4055a9b MA |
940 | seq = read_seqbegin(&vblank->seqlock); |
941 | vblank_count = vblank->count; | |
942 | *vblanktime = vblank->time; | |
943 | } while (read_seqretry(&vblank->seqlock, seq)); | |
27641c3f | 944 | |
d4055a9b | 945 | return vblank_count; |
27641c3f | 946 | } |
27641c3f | 947 | |
cf648305 TR |
948 | /** |
949 | * drm_crtc_vblank_count_and_time - retrieve "cooked" vblank counter value | |
950 | * and the system timestamp corresponding to that vblank counter value | |
951 | * @crtc: which counter to retrieve | |
952 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. | |
953 | * | |
954 | * Fetches the "cooked" vblank count value that represents the number of | |
955 | * vblank events since the system was booted, including lost events due to | |
956 | * modesetting activity. Returns corresponding system timestamp of the time | |
957 | * of the vblank interval that corresponds to the current vblank counter value. | |
cf648305 TR |
958 | */ |
959 | u32 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc, | |
960 | struct timeval *vblanktime) | |
961 | { | |
962 | return drm_vblank_count_and_time(crtc->dev, drm_crtc_index(crtc), | |
963 | vblanktime); | |
964 | } | |
965 | EXPORT_SYMBOL(drm_crtc_vblank_count_and_time); | |
966 | ||
c6eefa17 RC |
967 | static void send_vblank_event(struct drm_device *dev, |
968 | struct drm_pending_vblank_event *e, | |
969 | unsigned long seq, struct timeval *now) | |
970 | { | |
c6eefa17 RC |
971 | e->event.sequence = seq; |
972 | e->event.tv_sec = now->tv_sec; | |
973 | e->event.tv_usec = now->tv_usec; | |
974 | ||
7d52cb88 | 975 | trace_drm_vblank_event_delivered(e->base.file_priv, e->pipe, |
c6eefa17 | 976 | e->event.sequence); |
c001da4f MA |
977 | |
978 | drm_send_event_locked(dev, &e->base); | |
c6eefa17 RC |
979 | } |
980 | ||
bbc8764f DV |
981 | /** |
982 | * drm_crtc_arm_vblank_event - arm vblank event after pageflip | |
983 | * @crtc: the source CRTC of the vblank event | |
984 | * @e: the event to send | |
985 | * | |
986 | * A lot of drivers need to generate vblank events for the very next vblank | |
987 | * interrupt. For example when the page flip interrupt happens when the page | |
988 | * flip gets armed, but not when it actually executes within the next vblank | |
989 | * period. This helper function implements exactly the required vblank arming | |
990 | * behaviour. | |
991 | * | |
ef40cbf9 DV |
992 | * NOTE: Drivers using this to send out the &drm_crtc_state.event as part of an |
993 | * atomic commit must ensure that the next vblank happens at exactly the same | |
994 | * time as the atomic commit is committed to the hardware. This function itself | |
995 | * does **not** protect again the next vblank interrupt racing with either this | |
996 | * function call or the atomic commit operation. A possible sequence could be: | |
61802130 DV |
997 | * |
998 | * 1. Driver commits new hardware state into vblank-synchronized registers. | |
999 | * 2. A vblank happens, committing the hardware state. Also the corresponding | |
1000 | * vblank interrupt is fired off and fully processed by the interrupt | |
1001 | * handler. | |
1002 | * 3. The atomic commit operation proceeds to call drm_crtc_arm_vblank_event(). | |
1003 | * 4. The event is only send out for the next vblank, which is wrong. | |
1004 | * | |
1005 | * An equivalent race can happen when the driver calls | |
1006 | * drm_crtc_arm_vblank_event() before writing out the new hardware state. | |
1007 | * | |
1008 | * The only way to make this work safely is to prevent the vblank from firing | |
1009 | * (and the hardware from committing anything else) until the entire atomic | |
1010 | * commit sequence has run to completion. If the hardware does not have such a | |
1011 | * feature (e.g. using a "go" bit), then it is unsafe to use this functions. | |
1012 | * Instead drivers need to manually send out the event from their interrupt | |
1013 | * handler by calling drm_crtc_send_vblank_event() and make sure that there's no | |
1014 | * possible race with the hardware committing the atomic update. | |
1015 | * | |
bbc8764f DV |
1016 | * Caller must hold event lock. Caller must also hold a vblank reference for |
1017 | * the event @e, which will be dropped when the next vblank arrives. | |
bbc8764f DV |
1018 | */ |
1019 | void drm_crtc_arm_vblank_event(struct drm_crtc *crtc, | |
1020 | struct drm_pending_vblank_event *e) | |
1021 | { | |
93507d13 GP |
1022 | struct drm_device *dev = crtc->dev; |
1023 | unsigned int pipe = drm_crtc_index(crtc); | |
1024 | ||
1025 | assert_spin_locked(&dev->event_lock); | |
1026 | ||
1027 | e->pipe = pipe; | |
1028 | e->event.sequence = drm_vblank_count(dev, pipe); | |
1029 | list_add_tail(&e->base.link, &dev->vblank_event_list); | |
bbc8764f DV |
1030 | } |
1031 | EXPORT_SYMBOL(drm_crtc_arm_vblank_event); | |
1032 | ||
c6eefa17 | 1033 | /** |
db749b7e GP |
1034 | * drm_crtc_send_vblank_event - helper to send vblank event after pageflip |
1035 | * @crtc: the source CRTC of the vblank event | |
c6eefa17 RC |
1036 | * @e: the event to send |
1037 | * | |
61802130 DV |
1038 | * Updates sequence # and timestamp on event for the most recently processed |
1039 | * vblank, and sends it to userspace. Caller must hold event lock. | |
1040 | * | |
1041 | * See drm_crtc_arm_vblank_event() for a helper which can be used in certain | |
1042 | * situation, especially to send out events for atomic commit operations. | |
c6eefa17 | 1043 | */ |
db749b7e GP |
1044 | void drm_crtc_send_vblank_event(struct drm_crtc *crtc, |
1045 | struct drm_pending_vblank_event *e) | |
c6eefa17 | 1046 | { |
db749b7e GP |
1047 | struct drm_device *dev = crtc->dev; |
1048 | unsigned int seq, pipe = drm_crtc_index(crtc); | |
c6eefa17 | 1049 | struct timeval now; |
4dfd909f | 1050 | |
2a7d3d6d | 1051 | if (dev->num_crtcs > 0) { |
cc1ef118 | 1052 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
c6eefa17 RC |
1053 | } else { |
1054 | seq = 0; | |
c61eef72 ID |
1055 | |
1056 | now = get_drm_timestamp(); | |
c6eefa17 | 1057 | } |
cc1ef118 | 1058 | e->pipe = pipe; |
c6eefa17 RC |
1059 | send_vblank_event(dev, e, seq, &now); |
1060 | } | |
a4d7b30d TR |
1061 | EXPORT_SYMBOL(drm_crtc_send_vblank_event); |
1062 | ||
84e35483 SG |
1063 | static int __enable_vblank(struct drm_device *dev, unsigned int pipe) |
1064 | { | |
1065 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
1066 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
1067 | ||
1068 | if (crtc->funcs->enable_vblank) | |
1069 | return crtc->funcs->enable_vblank(crtc); | |
1070 | } | |
1071 | ||
1072 | return dev->driver->enable_vblank(dev, pipe); | |
1073 | } | |
1074 | ||
f2752282 VS |
1075 | /** |
1076 | * drm_vblank_enable - enable the vblank interrupt on a CRTC | |
1077 | * @dev: DRM device | |
cc1ef118 | 1078 | * @pipe: CRTC index |
c30e11fc TR |
1079 | * |
1080 | * Returns: | |
1081 | * Zero on success or a negative error code on failure. | |
f2752282 | 1082 | */ |
cc1ef118 | 1083 | static int drm_vblank_enable(struct drm_device *dev, unsigned int pipe) |
f2752282 | 1084 | { |
cc1ef118 | 1085 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
f2752282 VS |
1086 | int ret = 0; |
1087 | ||
1088 | assert_spin_locked(&dev->vbl_lock); | |
1089 | ||
1090 | spin_lock(&dev->vblank_time_lock); | |
1091 | ||
8a51d5be | 1092 | if (!vblank->enabled) { |
1cfb80b1 DV |
1093 | /* |
1094 | * Enable vblank irqs under vblank_time_lock protection. | |
f2752282 VS |
1095 | * All vblank count & timestamp updates are held off |
1096 | * until we are done reinitializing master counter and | |
1097 | * timestamps. Filtercode in drm_handle_vblank() will | |
1098 | * prevent double-accounting of same vblank interval. | |
1099 | */ | |
84e35483 | 1100 | ret = __enable_vblank(dev, pipe); |
cc1ef118 | 1101 | DRM_DEBUG("enabling vblank on crtc %u, ret: %d\n", pipe, ret); |
43dc7fe2 | 1102 | if (ret) { |
8a51d5be | 1103 | atomic_dec(&vblank->refcount); |
43dc7fe2 | 1104 | } else { |
a6e610dc | 1105 | drm_update_vblank_count(dev, pipe, 0); |
43dc7fe2 CW |
1106 | /* drm_update_vblank_count() includes a wmb so we just |
1107 | * need to ensure that the compiler emits the write | |
1108 | * to mark the vblank as enabled after the call | |
1109 | * to drm_update_vblank_count(). | |
1110 | */ | |
1111 | WRITE_ONCE(vblank->enabled, true); | |
f2752282 VS |
1112 | } |
1113 | } | |
1114 | ||
1115 | spin_unlock(&dev->vblank_time_lock); | |
1116 | ||
1117 | return ret; | |
1118 | } | |
1119 | ||
0a3e67a4 JB |
1120 | /** |
1121 | * drm_vblank_get - get a reference count on vblank events | |
1122 | * @dev: DRM device | |
cc1ef118 | 1123 | * @pipe: index of CRTC to own |
0a3e67a4 JB |
1124 | * |
1125 | * Acquire a reference count on vblank events to avoid having them disabled | |
1126 | * while in use. | |
1127 | * | |
89dd6a4b DV |
1128 | * This is the legacy version of drm_crtc_vblank_get(). |
1129 | * | |
f5752b38 | 1130 | * Returns: |
c30e11fc | 1131 | * Zero on success or a negative error code on failure. |
0a3e67a4 | 1132 | */ |
ceb74152 | 1133 | static int drm_vblank_get(struct drm_device *dev, unsigned int pipe) |
0a3e67a4 | 1134 | { |
cc1ef118 | 1135 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
97cbc883 | 1136 | unsigned long irqflags; |
0a3e67a4 JB |
1137 | int ret = 0; |
1138 | ||
16e3247d GH |
1139 | if (!dev->num_crtcs) |
1140 | return -EINVAL; | |
1141 | ||
cc1ef118 | 1142 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1143 | return -EINVAL; |
1144 | ||
0a3e67a4 JB |
1145 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
1146 | /* Going from 0->1 means we have to enable interrupts again */ | |
8a51d5be | 1147 | if (atomic_add_return(1, &vblank->refcount) == 1) { |
cc1ef118 | 1148 | ret = drm_vblank_enable(dev, pipe); |
778c9026 | 1149 | } else { |
8a51d5be VS |
1150 | if (!vblank->enabled) { |
1151 | atomic_dec(&vblank->refcount); | |
778c9026 | 1152 | ret = -EINVAL; |
0a3e67a4 JB |
1153 | } |
1154 | } | |
1155 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1156 | ||
1157 | return ret; | |
1158 | } | |
0a3e67a4 | 1159 | |
89dd6a4b DV |
1160 | /** |
1161 | * drm_crtc_vblank_get - get a reference count on vblank events | |
1162 | * @crtc: which CRTC to own | |
1163 | * | |
1164 | * Acquire a reference count on vblank events to avoid having them disabled | |
1165 | * while in use. | |
1166 | * | |
89dd6a4b | 1167 | * Returns: |
c30e11fc | 1168 | * Zero on success or a negative error code on failure. |
89dd6a4b DV |
1169 | */ |
1170 | int drm_crtc_vblank_get(struct drm_crtc *crtc) | |
1171 | { | |
1172 | return drm_vblank_get(crtc->dev, drm_crtc_index(crtc)); | |
1173 | } | |
1174 | EXPORT_SYMBOL(drm_crtc_vblank_get); | |
1175 | ||
0a3e67a4 | 1176 | /** |
cc1ef118 | 1177 | * drm_vblank_put - release ownership of vblank events |
0a3e67a4 | 1178 | * @dev: DRM device |
cc1ef118 | 1179 | * @pipe: index of CRTC to release |
0a3e67a4 JB |
1180 | * |
1181 | * Release ownership of a given vblank counter, turning off interrupts | |
27641c3f | 1182 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. |
89dd6a4b DV |
1183 | * |
1184 | * This is the legacy version of drm_crtc_vblank_put(). | |
0a3e67a4 | 1185 | */ |
ceb74152 | 1186 | static void drm_vblank_put(struct drm_device *dev, unsigned int pipe) |
0a3e67a4 | 1187 | { |
cc1ef118 | 1188 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
8a51d5be | 1189 | |
cc1ef118 | 1190 | if (WARN_ON(pipe >= dev->num_crtcs)) |
7f907bf2 | 1191 | return; |
b3f5e732 | 1192 | |
7d1de851 | 1193 | if (WARN_ON(atomic_read(&vblank->refcount) == 0)) |
e6ae8687 RC |
1194 | return; |
1195 | ||
0a3e67a4 | 1196 | /* Last user schedules interrupt disable */ |
4ed0ce3d | 1197 | if (atomic_dec_and_test(&vblank->refcount)) { |
ab8905f1 DV |
1198 | if (drm_vblank_offdelay == 0) |
1199 | return; | |
608b2050 | 1200 | else if (drm_vblank_offdelay < 0) |
4ed0ce3d | 1201 | vblank_disable_fn((unsigned long)vblank); |
608b2050 | 1202 | else if (!dev->vblank_disable_immediate) |
4ed0ce3d VS |
1203 | mod_timer(&vblank->disable_timer, |
1204 | jiffies + ((drm_vblank_offdelay * HZ)/1000)); | |
1205 | } | |
0a3e67a4 | 1206 | } |
0a3e67a4 | 1207 | |
89dd6a4b DV |
1208 | /** |
1209 | * drm_crtc_vblank_put - give up ownership of vblank events | |
1210 | * @crtc: which counter to give up | |
1211 | * | |
1212 | * Release ownership of a given vblank counter, turning off interrupts | |
1213 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. | |
89dd6a4b DV |
1214 | */ |
1215 | void drm_crtc_vblank_put(struct drm_crtc *crtc) | |
1216 | { | |
1217 | drm_vblank_put(crtc->dev, drm_crtc_index(crtc)); | |
1218 | } | |
1219 | EXPORT_SYMBOL(drm_crtc_vblank_put); | |
1220 | ||
e8450f51 DV |
1221 | /** |
1222 | * drm_wait_one_vblank - wait for one vblank | |
1223 | * @dev: DRM device | |
cc1ef118 | 1224 | * @pipe: CRTC index |
e8450f51 | 1225 | * |
1da248a5 VS |
1226 | * This waits for one vblank to pass on @pipe, using the irq driver interfaces. |
1227 | * It is a failure to call this when the vblank irq for @pipe is disabled, e.g. | |
e8450f51 DV |
1228 | * due to lack of driver support or because the crtc is off. |
1229 | */ | |
cc1ef118 | 1230 | void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe) |
e8450f51 | 1231 | { |
cc1ef118 | 1232 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
e8450f51 DV |
1233 | int ret; |
1234 | u32 last; | |
1235 | ||
cc1ef118 | 1236 | if (WARN_ON(pipe >= dev->num_crtcs)) |
7d1de851 TR |
1237 | return; |
1238 | ||
cc1ef118 TR |
1239 | ret = drm_vblank_get(dev, pipe); |
1240 | if (WARN(ret, "vblank not available on crtc %i, ret=%i\n", pipe, ret)) | |
e8450f51 DV |
1241 | return; |
1242 | ||
cc1ef118 | 1243 | last = drm_vblank_count(dev, pipe); |
e8450f51 | 1244 | |
cc1ef118 TR |
1245 | ret = wait_event_timeout(vblank->queue, |
1246 | last != drm_vblank_count(dev, pipe), | |
e8450f51 DV |
1247 | msecs_to_jiffies(100)); |
1248 | ||
cc1ef118 | 1249 | WARN(ret == 0, "vblank wait timed out on crtc %i\n", pipe); |
e8450f51 | 1250 | |
cc1ef118 | 1251 | drm_vblank_put(dev, pipe); |
e8450f51 DV |
1252 | } |
1253 | EXPORT_SYMBOL(drm_wait_one_vblank); | |
1254 | ||
1255 | /** | |
1256 | * drm_crtc_wait_one_vblank - wait for one vblank | |
1257 | * @crtc: DRM crtc | |
1258 | * | |
1259 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. | |
1260 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. | |
1261 | * due to lack of driver support or because the crtc is off. | |
1262 | */ | |
1263 | void drm_crtc_wait_one_vblank(struct drm_crtc *crtc) | |
1264 | { | |
1265 | drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1266 | } | |
1267 | EXPORT_SYMBOL(drm_crtc_wait_one_vblank); | |
1268 | ||
c6eefa17 | 1269 | /** |
2d1e331f DV |
1270 | * drm_crtc_vblank_off - disable vblank events on a CRTC |
1271 | * @crtc: CRTC in question | |
c6eefa17 | 1272 | * |
f5752b38 DV |
1273 | * Drivers can use this function to shut down the vblank interrupt handling when |
1274 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
2d1e331f | 1275 | * stored so that drm_vblank_on can restore it again. |
f5752b38 DV |
1276 | * |
1277 | * Drivers must use this function when the hardware vblank counter can get | |
1278 | * reset, e.g. when suspending. | |
c6eefa17 | 1279 | */ |
2d1e331f | 1280 | void drm_crtc_vblank_off(struct drm_crtc *crtc) |
778c9026 | 1281 | { |
2d1e331f DV |
1282 | struct drm_device *dev = crtc->dev; |
1283 | unsigned int pipe = drm_crtc_index(crtc); | |
cc1ef118 | 1284 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
498548ec CJHR |
1285 | struct drm_pending_vblank_event *e, *t; |
1286 | struct timeval now; | |
778c9026 | 1287 | unsigned long irqflags; |
498548ec | 1288 | unsigned int seq; |
778c9026 | 1289 | |
cc1ef118 | 1290 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1291 | return; |
1292 | ||
56cc279b VS |
1293 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1294 | ||
1295 | spin_lock(&dev->vbl_lock); | |
e8235891 MK |
1296 | DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n", |
1297 | pipe, vblank->enabled, vblank->inmodeset); | |
1298 | ||
2d1e331f DV |
1299 | /* Avoid redundant vblank disables without previous |
1300 | * drm_crtc_vblank_on(). */ | |
e8235891 MK |
1301 | if (drm_core_check_feature(dev, DRIVER_ATOMIC) || !vblank->inmodeset) |
1302 | vblank_disable_and_save(dev, pipe); | |
1303 | ||
8a51d5be | 1304 | wake_up(&vblank->queue); |
498548ec | 1305 | |
56cc279b VS |
1306 | /* |
1307 | * Prevent subsequent drm_vblank_get() from re-enabling | |
1308 | * the vblank interrupt by bumping the refcount. | |
1309 | */ | |
1310 | if (!vblank->inmodeset) { | |
1311 | atomic_inc(&vblank->refcount); | |
1312 | vblank->inmodeset = 1; | |
1313 | } | |
1314 | spin_unlock(&dev->vbl_lock); | |
1315 | ||
498548ec | 1316 | /* Send any queued vblank events, lest the natives grow disquiet */ |
cc1ef118 | 1317 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
e7783ba3 | 1318 | |
498548ec | 1319 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { |
cc1ef118 | 1320 | if (e->pipe != pipe) |
498548ec | 1321 | continue; |
44844892 | 1322 | DRM_DEBUG("Sending premature vblank event on disable: " |
1d776851 | 1323 | "wanted %u, current %u\n", |
498548ec | 1324 | e->event.sequence, seq); |
c6eefa17 | 1325 | list_del(&e->base.link); |
cc1ef118 | 1326 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1327 | send_vblank_event(dev, e, seq, &now); |
498548ec | 1328 | } |
56cc279b | 1329 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
778c9026 | 1330 | } |
89dd6a4b DV |
1331 | EXPORT_SYMBOL(drm_crtc_vblank_off); |
1332 | ||
9625604c DV |
1333 | /** |
1334 | * drm_crtc_vblank_reset - reset vblank state to off on a CRTC | |
2b193f02 | 1335 | * @crtc: CRTC in question |
9625604c DV |
1336 | * |
1337 | * Drivers can use this function to reset the vblank state to off at load time. | |
1338 | * Drivers should use this together with the drm_crtc_vblank_off() and | |
1339 | * drm_crtc_vblank_on() functions. The difference compared to | |
1340 | * drm_crtc_vblank_off() is that this function doesn't save the vblank counter | |
1341 | * and hence doesn't need to call any driver hooks. | |
1342 | */ | |
2b193f02 | 1343 | void drm_crtc_vblank_reset(struct drm_crtc *crtc) |
9625604c | 1344 | { |
2b193f02 | 1345 | struct drm_device *dev = crtc->dev; |
9625604c | 1346 | unsigned long irqflags; |
2b193f02 | 1347 | unsigned int pipe = drm_crtc_index(crtc); |
1da248a5 | 1348 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
9625604c DV |
1349 | |
1350 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1351 | /* | |
1352 | * Prevent subsequent drm_vblank_get() from enabling the vblank | |
1353 | * interrupt by bumping the refcount. | |
1354 | */ | |
1355 | if (!vblank->inmodeset) { | |
1356 | atomic_inc(&vblank->refcount); | |
1357 | vblank->inmodeset = 1; | |
1358 | } | |
1359 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1360 | ||
1361 | WARN_ON(!list_empty(&dev->vblank_event_list)); | |
1362 | } | |
1363 | EXPORT_SYMBOL(drm_crtc_vblank_reset); | |
1364 | ||
f2752282 | 1365 | /** |
2d1e331f DV |
1366 | * drm_crtc_vblank_on - enable vblank events on a CRTC |
1367 | * @crtc: CRTC in question | |
f5752b38 DV |
1368 | * |
1369 | * This functions restores the vblank interrupt state captured with | |
2d1e331f DV |
1370 | * drm_crtc_vblank_off() again. Note that calls to drm_crtc_vblank_on() and |
1371 | * drm_crtc_vblank_off() can be unbalanced and so can also be unconditionally called | |
f5752b38 | 1372 | * in driver load code to reflect the current hardware state of the crtc. |
f2752282 | 1373 | */ |
2d1e331f | 1374 | void drm_crtc_vblank_on(struct drm_crtc *crtc) |
f2752282 | 1375 | { |
2d1e331f DV |
1376 | struct drm_device *dev = crtc->dev; |
1377 | unsigned int pipe = drm_crtc_index(crtc); | |
cc1ef118 | 1378 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
f2752282 VS |
1379 | unsigned long irqflags; |
1380 | ||
cc1ef118 | 1381 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1382 | return; |
1383 | ||
f2752282 | 1384 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
e8235891 MK |
1385 | DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n", |
1386 | pipe, vblank->enabled, vblank->inmodeset); | |
1387 | ||
7ffd7a68 | 1388 | /* Drop our private "prevent drm_vblank_get" refcount */ |
8a51d5be VS |
1389 | if (vblank->inmodeset) { |
1390 | atomic_dec(&vblank->refcount); | |
1391 | vblank->inmodeset = 0; | |
7ffd7a68 | 1392 | } |
f8ad028c | 1393 | |
4dfd6486 VS |
1394 | drm_reset_vblank_timestamp(dev, pipe); |
1395 | ||
cd19e52a VS |
1396 | /* |
1397 | * re-enable interrupts if there are users left, or the | |
1398 | * user wishes vblank interrupts to be enabled all the time. | |
1399 | */ | |
bb74fc1b | 1400 | if (atomic_read(&vblank->refcount) != 0 || drm_vblank_offdelay == 0) |
cc1ef118 | 1401 | WARN_ON(drm_vblank_enable(dev, pipe)); |
f2752282 VS |
1402 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
1403 | } | |
89dd6a4b DV |
1404 | EXPORT_SYMBOL(drm_crtc_vblank_on); |
1405 | ||
07600c53 DV |
1406 | static void drm_legacy_vblank_pre_modeset(struct drm_device *dev, |
1407 | unsigned int pipe) | |
f453ba04 | 1408 | { |
cc1ef118 | 1409 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
8a51d5be | 1410 | |
b7ea85a4 | 1411 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
e77cef9c JG |
1412 | if (!dev->num_crtcs) |
1413 | return; | |
e6ae8687 | 1414 | |
cc1ef118 | 1415 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1416 | return; |
1417 | ||
f453ba04 DA |
1418 | /* |
1419 | * To avoid all the problems that might happen if interrupts | |
1420 | * were enabled/disabled around or between these calls, we just | |
1421 | * have the kernel take a reference on the CRTC (just once though | |
1422 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
1423 | * so that interrupts remain enabled in the interim. | |
1424 | */ | |
8a51d5be VS |
1425 | if (!vblank->inmodeset) { |
1426 | vblank->inmodeset = 0x1; | |
cc1ef118 | 1427 | if (drm_vblank_get(dev, pipe) == 0) |
8a51d5be | 1428 | vblank->inmodeset |= 0x2; |
f453ba04 DA |
1429 | } |
1430 | } | |
f453ba04 | 1431 | |
07600c53 DV |
1432 | static void drm_legacy_vblank_post_modeset(struct drm_device *dev, |
1433 | unsigned int pipe) | |
f453ba04 | 1434 | { |
cc1ef118 | 1435 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
f453ba04 DA |
1436 | unsigned long irqflags; |
1437 | ||
b7ea85a4 HC |
1438 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
1439 | if (!dev->num_crtcs) | |
1440 | return; | |
1441 | ||
cc1ef118 | 1442 | if (WARN_ON(pipe >= dev->num_crtcs)) |
7d1de851 TR |
1443 | return; |
1444 | ||
8a51d5be | 1445 | if (vblank->inmodeset) { |
f453ba04 | 1446 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
c61934ed | 1447 | drm_reset_vblank_timestamp(dev, pipe); |
f453ba04 | 1448 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
b3f5e732 | 1449 | |
8a51d5be | 1450 | if (vblank->inmodeset & 0x2) |
cc1ef118 | 1451 | drm_vblank_put(dev, pipe); |
b3f5e732 | 1452 | |
8a51d5be | 1453 | vblank->inmodeset = 0; |
f453ba04 DA |
1454 | } |
1455 | } | |
f453ba04 | 1456 | |
25a9939c DV |
1457 | int drm_legacy_modeset_ctl(struct drm_device *dev, void *data, |
1458 | struct drm_file *file_priv) | |
0a3e67a4 JB |
1459 | { |
1460 | struct drm_modeset_ctl *modeset = data; | |
cc1ef118 | 1461 | unsigned int pipe; |
0a3e67a4 JB |
1462 | |
1463 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
1464 | if (!dev->num_crtcs) | |
4a1b0714 | 1465 | return 0; |
0a3e67a4 | 1466 | |
29935554 | 1467 | /* KMS drivers handle this internally */ |
fa538645 | 1468 | if (!drm_core_check_feature(dev, DRIVER_LEGACY)) |
29935554 LP |
1469 | return 0; |
1470 | ||
cc1ef118 TR |
1471 | pipe = modeset->crtc; |
1472 | if (pipe >= dev->num_crtcs) | |
4a1b0714 | 1473 | return -EINVAL; |
0a3e67a4 | 1474 | |
0a3e67a4 JB |
1475 | switch (modeset->cmd) { |
1476 | case _DRM_PRE_MODESET: | |
07600c53 | 1477 | drm_legacy_vblank_pre_modeset(dev, pipe); |
0a3e67a4 JB |
1478 | break; |
1479 | case _DRM_POST_MODESET: | |
07600c53 | 1480 | drm_legacy_vblank_post_modeset(dev, pipe); |
0a3e67a4 JB |
1481 | break; |
1482 | default: | |
4a1b0714 | 1483 | return -EINVAL; |
0a3e67a4 JB |
1484 | } |
1485 | ||
4a1b0714 | 1486 | return 0; |
0a3e67a4 JB |
1487 | } |
1488 | ||
9a4d9bab CW |
1489 | static inline bool vblank_passed(u32 seq, u32 ref) |
1490 | { | |
1491 | return (seq - ref) <= (1 << 23); | |
1492 | } | |
1493 | ||
cc1ef118 | 1494 | static int drm_queue_vblank_event(struct drm_device *dev, unsigned int pipe, |
c9a9c5e0 KH |
1495 | union drm_wait_vblank *vblwait, |
1496 | struct drm_file *file_priv) | |
1497 | { | |
ffe7c73a | 1498 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
c9a9c5e0 KH |
1499 | struct drm_pending_vblank_event *e; |
1500 | struct timeval now; | |
1501 | unsigned long flags; | |
1502 | unsigned int seq; | |
ea5d552c | 1503 | int ret; |
c9a9c5e0 | 1504 | |
f76511b9 | 1505 | e = kzalloc(sizeof(*e), GFP_KERNEL); |
ea5d552c CW |
1506 | if (e == NULL) { |
1507 | ret = -ENOMEM; | |
1508 | goto err_put; | |
1509 | } | |
c9a9c5e0 KH |
1510 | |
1511 | e->pipe = pipe; | |
1512 | e->event.base.type = DRM_EVENT_VBLANK; | |
f76511b9 | 1513 | e->event.base.length = sizeof(e->event); |
c9a9c5e0 | 1514 | e->event.user_data = vblwait->request.signal; |
c9a9c5e0 | 1515 | |
c9a9c5e0 KH |
1516 | spin_lock_irqsave(&dev->event_lock, flags); |
1517 | ||
ffe7c73a | 1518 | /* |
2d1e331f DV |
1519 | * drm_crtc_vblank_off() might have been called after we called |
1520 | * drm_vblank_get(). drm_crtc_vblank_off() holds event_lock around the | |
1521 | * vblank disable, so no need for further locking. The reference from | |
1522 | * drm_vblank_get() protects against vblank disable from another source. | |
ffe7c73a | 1523 | */ |
43dc7fe2 | 1524 | if (!READ_ONCE(vblank->enabled)) { |
ffe7c73a VS |
1525 | ret = -EINVAL; |
1526 | goto err_unlock; | |
1527 | } | |
1528 | ||
4020b220 DV |
1529 | ret = drm_event_reserve_init_locked(dev, file_priv, &e->base, |
1530 | &e->event.base); | |
1531 | ||
1532 | if (ret) | |
ea5d552c | 1533 | goto err_unlock; |
c9a9c5e0 | 1534 | |
27641c3f MK |
1535 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1536 | ||
1d776851 | 1537 | DRM_DEBUG("event on vblank count %u, current %u, crtc %u\n", |
c9a9c5e0 KH |
1538 | vblwait->request.sequence, seq, pipe); |
1539 | ||
7d52cb88 | 1540 | trace_drm_vblank_event_queued(file_priv, pipe, |
b9c2c9ae JB |
1541 | vblwait->request.sequence); |
1542 | ||
c9a9c5e0 | 1543 | e->event.sequence = vblwait->request.sequence; |
9a4d9bab | 1544 | if (vblank_passed(seq, vblwait->request.sequence)) { |
6f331623 | 1545 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1546 | send_vblank_event(dev, e, seq, &now); |
000fa7cf | 1547 | vblwait->reply.sequence = seq; |
c9a9c5e0 | 1548 | } else { |
a6778e9e | 1549 | /* drm_handle_vblank_events will call drm_vblank_put */ |
c9a9c5e0 | 1550 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
000fa7cf | 1551 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1552 | } |
1553 | ||
1554 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1555 | ||
1556 | return 0; | |
ea5d552c CW |
1557 | |
1558 | err_unlock: | |
1559 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1560 | kfree(e); | |
1561 | err_put: | |
6f331623 | 1562 | drm_vblank_put(dev, pipe); |
ea5d552c | 1563 | return ret; |
c9a9c5e0 KH |
1564 | } |
1565 | ||
b33b0270 CW |
1566 | static bool drm_wait_vblank_is_query(union drm_wait_vblank *vblwait) |
1567 | { | |
1568 | if (vblwait->request.sequence) | |
1569 | return false; | |
1570 | ||
1571 | return _DRM_VBLANK_RELATIVE == | |
1572 | (vblwait->request.type & (_DRM_VBLANK_TYPES_MASK | | |
1573 | _DRM_VBLANK_EVENT | | |
1574 | _DRM_VBLANK_NEXTONMISS)); | |
1575 | } | |
1576 | ||
f5752b38 | 1577 | /* |
1da177e4 LT |
1578 | * Wait for VBLANK. |
1579 | * | |
1580 | * \param inode device inode. | |
6c340eac | 1581 | * \param file_priv DRM file private. |
1da177e4 LT |
1582 | * \param cmd command. |
1583 | * \param data user argument, pointing to a drm_wait_vblank structure. | |
1584 | * \return zero on success or a negative number on failure. | |
1585 | * | |
30b23634 EA |
1586 | * This function enables the vblank interrupt on the pipe requested, then |
1587 | * sleeps waiting for the requested sequence number to occur, and drops | |
f5752b38 | 1588 | * the vblank interrupt refcount afterwards. (vblank IRQ disable follows that |
30b23634 | 1589 | * after a timeout with no further vblank waits scheduled). |
1da177e4 | 1590 | */ |
0a3e67a4 JB |
1591 | int drm_wait_vblank(struct drm_device *dev, void *data, |
1592 | struct drm_file *file_priv) | |
1da177e4 | 1593 | { |
8a51d5be | 1594 | struct drm_vblank_crtc *vblank; |
c153f45f | 1595 | union drm_wait_vblank *vblwait = data; |
4a1b0714 | 1596 | int ret; |
cc1ef118 | 1597 | unsigned int flags, seq, pipe, high_pipe; |
1da177e4 | 1598 | |
4984979b DV |
1599 | if (!dev->irq_enabled) |
1600 | return -EINVAL; | |
1da177e4 | 1601 | |
30b23634 EA |
1602 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) |
1603 | return -EINVAL; | |
1604 | ||
c153f45f | 1605 | if (vblwait->request.type & |
19b01b5f IH |
1606 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1607 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
776c9443 | 1608 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", |
c153f45f | 1609 | vblwait->request.type, |
19b01b5f IH |
1610 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1611 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
776c9443 MD |
1612 | return -EINVAL; |
1613 | } | |
1614 | ||
c153f45f | 1615 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
cc1ef118 TR |
1616 | high_pipe = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); |
1617 | if (high_pipe) | |
1618 | pipe = high_pipe >> _DRM_VBLANK_HIGH_CRTC_SHIFT; | |
19b01b5f | 1619 | else |
cc1ef118 TR |
1620 | pipe = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; |
1621 | if (pipe >= dev->num_crtcs) | |
776c9443 MD |
1622 | return -EINVAL; |
1623 | ||
cc1ef118 | 1624 | vblank = &dev->vblank[pipe]; |
8a51d5be | 1625 | |
b33b0270 CW |
1626 | /* If the counter is currently enabled and accurate, short-circuit |
1627 | * queries to return the cached timestamp of the last vblank. | |
1628 | */ | |
1629 | if (dev->vblank_disable_immediate && | |
1630 | drm_wait_vblank_is_query(vblwait) && | |
1631 | READ_ONCE(vblank->enabled)) { | |
1632 | struct timeval now; | |
1633 | ||
1634 | vblwait->reply.sequence = | |
1635 | drm_vblank_count_and_time(dev, pipe, &now); | |
1636 | vblwait->reply.tval_sec = now.tv_sec; | |
1637 | vblwait->reply.tval_usec = now.tv_usec; | |
1638 | return 0; | |
1639 | } | |
1640 | ||
cc1ef118 | 1641 | ret = drm_vblank_get(dev, pipe); |
0a3e67a4 | 1642 | if (ret) { |
82c8e025 | 1643 | DRM_DEBUG("crtc %d failed to acquire vblank counter, %d\n", pipe, ret); |
0a3e67a4 JB |
1644 | return ret; |
1645 | } | |
cc1ef118 | 1646 | seq = drm_vblank_count(dev, pipe); |
776c9443 | 1647 | |
c153f45f | 1648 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
1da177e4 | 1649 | case _DRM_VBLANK_RELATIVE: |
c153f45f EA |
1650 | vblwait->request.sequence += seq; |
1651 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |
1da177e4 LT |
1652 | case _DRM_VBLANK_ABSOLUTE: |
1653 | break; | |
1654 | default: | |
0a3e67a4 JB |
1655 | ret = -EINVAL; |
1656 | goto done; | |
1da177e4 LT |
1657 | } |
1658 | ||
97ef1ae0 | 1659 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
9a4d9bab | 1660 | vblank_passed(seq, vblwait->request.sequence)) |
97ef1ae0 | 1661 | vblwait->request.sequence = seq + 1; |
97ef1ae0 | 1662 | |
a6778e9e IH |
1663 | if (flags & _DRM_VBLANK_EVENT) { |
1664 | /* must hold on to the vblank ref until the event fires | |
1665 | * drm_vblank_put will be called asynchronously | |
1666 | */ | |
cc1ef118 | 1667 | return drm_queue_vblank_event(dev, pipe, vblwait, file_priv); |
a6778e9e | 1668 | } |
c9a9c5e0 | 1669 | |
82c8e025 CW |
1670 | if (vblwait->request.sequence != seq) { |
1671 | DRM_DEBUG("waiting on vblank count %u, crtc %u\n", | |
1672 | vblwait->request.sequence, pipe); | |
1673 | DRM_WAIT_ON(ret, vblank->queue, 3 * HZ, | |
9a4d9bab CW |
1674 | vblank_passed(drm_vblank_count(dev, pipe), |
1675 | vblwait->request.sequence) || | |
6c06a597 | 1676 | !READ_ONCE(vblank->enabled)); |
82c8e025 | 1677 | } |
1da177e4 | 1678 | |
30b23634 EA |
1679 | if (ret != -EINTR) { |
1680 | struct timeval now; | |
1da177e4 | 1681 | |
cc1ef118 | 1682 | vblwait->reply.sequence = drm_vblank_count_and_time(dev, pipe, &now); |
30b23634 EA |
1683 | vblwait->reply.tval_sec = now.tv_sec; |
1684 | vblwait->reply.tval_usec = now.tv_usec; | |
27641c3f | 1685 | |
82c8e025 CW |
1686 | DRM_DEBUG("crtc %d returning %u to client\n", |
1687 | pipe, vblwait->reply.sequence); | |
1da177e4 | 1688 | } else { |
82c8e025 | 1689 | DRM_DEBUG("crtc %d vblank wait interrupted by signal\n", pipe); |
1da177e4 LT |
1690 | } |
1691 | ||
0a3e67a4 | 1692 | done: |
cc1ef118 | 1693 | drm_vblank_put(dev, pipe); |
1da177e4 LT |
1694 | return ret; |
1695 | } | |
1696 | ||
cc1ef118 | 1697 | static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe) |
c9a9c5e0 KH |
1698 | { |
1699 | struct drm_pending_vblank_event *e, *t; | |
1700 | struct timeval now; | |
c9a9c5e0 KH |
1701 | unsigned int seq; |
1702 | ||
56cc279b | 1703 | assert_spin_locked(&dev->event_lock); |
c9a9c5e0 | 1704 | |
cc1ef118 | 1705 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
c9a9c5e0 KH |
1706 | |
1707 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
cc1ef118 | 1708 | if (e->pipe != pipe) |
c9a9c5e0 | 1709 | continue; |
9a4d9bab | 1710 | if (!vblank_passed(seq, e->event.sequence)) |
c9a9c5e0 KH |
1711 | continue; |
1712 | ||
1d776851 | 1713 | DRM_DEBUG("vblank event on %u, current %u\n", |
c9a9c5e0 KH |
1714 | e->event.sequence, seq); |
1715 | ||
c6eefa17 | 1716 | list_del(&e->base.link); |
cc1ef118 | 1717 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1718 | send_vblank_event(dev, e, seq, &now); |
c9a9c5e0 KH |
1719 | } |
1720 | ||
cc1ef118 | 1721 | trace_drm_vblank_event(pipe, seq); |
c9a9c5e0 KH |
1722 | } |
1723 | ||
0a3e67a4 JB |
1724 | /** |
1725 | * drm_handle_vblank - handle a vblank event | |
1726 | * @dev: DRM device | |
cc1ef118 | 1727 | * @pipe: index of CRTC where this event occurred |
0a3e67a4 JB |
1728 | * |
1729 | * Drivers should call this routine in their vblank interrupt handlers to | |
1730 | * update the vblank counter and send any signals that may be pending. | |
115ebcd4 TR |
1731 | * |
1732 | * This is the legacy version of drm_crtc_handle_vblank(). | |
0a3e67a4 | 1733 | */ |
cc1ef118 | 1734 | bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe) |
0a3e67a4 | 1735 | { |
cc1ef118 | 1736 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
27641c3f | 1737 | unsigned long irqflags; |
75cff083 | 1738 | bool disable_irq; |
27641c3f | 1739 | |
ee3c7795 | 1740 | if (WARN_ON_ONCE(!dev->num_crtcs)) |
78c6e170 | 1741 | return false; |
c9a9c5e0 | 1742 | |
cc1ef118 | 1743 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1744 | return false; |
1745 | ||
56cc279b VS |
1746 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1747 | ||
27641c3f MK |
1748 | /* Need timestamp lock to prevent concurrent execution with |
1749 | * vblank enable/disable, as this would cause inconsistent | |
1750 | * or corrupted timestamps and vblank counts. | |
1751 | */ | |
56cc279b | 1752 | spin_lock(&dev->vblank_time_lock); |
27641c3f MK |
1753 | |
1754 | /* Vblank irq handling disabled. Nothing to do. */ | |
8a51d5be | 1755 | if (!vblank->enabled) { |
56cc279b VS |
1756 | spin_unlock(&dev->vblank_time_lock); |
1757 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
78c6e170 | 1758 | return false; |
27641c3f MK |
1759 | } |
1760 | ||
4dfd6486 | 1761 | drm_update_vblank_count(dev, pipe, DRM_CALLED_FROM_VBLIRQ); |
27641c3f | 1762 | |
56cc279b VS |
1763 | spin_unlock(&dev->vblank_time_lock); |
1764 | ||
8a51d5be | 1765 | wake_up(&vblank->queue); |
27641c3f | 1766 | |
608b2050 | 1767 | /* With instant-off, we defer disabling the interrupt until after |
75cff083 CW |
1768 | * we finish processing the following vblank after all events have |
1769 | * been signaled. The disable has to be last (after | |
1770 | * drm_handle_vblank_events) so that the timestamp is always accurate. | |
608b2050 | 1771 | */ |
75cff083 CW |
1772 | disable_irq = (dev->vblank_disable_immediate && |
1773 | drm_vblank_offdelay > 0 && | |
1774 | !atomic_read(&vblank->refcount)); | |
1775 | ||
1776 | drm_handle_vblank_events(dev, pipe); | |
608b2050 | 1777 | |
56cc279b VS |
1778 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
1779 | ||
75cff083 CW |
1780 | if (disable_irq) |
1781 | vblank_disable_fn((unsigned long)vblank); | |
1782 | ||
78c6e170 | 1783 | return true; |
0a3e67a4 JB |
1784 | } |
1785 | EXPORT_SYMBOL(drm_handle_vblank); | |
115ebcd4 TR |
1786 | |
1787 | /** | |
1788 | * drm_crtc_handle_vblank - handle a vblank event | |
1789 | * @crtc: where this event occurred | |
1790 | * | |
1791 | * Drivers should call this routine in their vblank interrupt handlers to | |
1792 | * update the vblank counter and send any signals that may be pending. | |
1793 | * | |
1794 | * This is the native KMS version of drm_handle_vblank(). | |
1795 | * | |
1796 | * Returns: | |
1797 | * True if the event was successfully handled, false on failure. | |
1798 | */ | |
1799 | bool drm_crtc_handle_vblank(struct drm_crtc *crtc) | |
1800 | { | |
1801 | return drm_handle_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1802 | } | |
1803 | EXPORT_SYMBOL(drm_crtc_handle_vblank); |