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8d754544 DV |
1 | /* |
2 | * Copyright (c) 2006-2008 Intel Corporation | |
3 | * Copyright (c) 2007 Dave Airlie <airlied@linux.ie> | |
4 | * | |
5 | * DRM core CRTC related functions | |
6 | * | |
7 | * Permission to use, copy, modify, distribute, and sell this software and its | |
8 | * documentation for any purpose is hereby granted without fee, provided that | |
9 | * the above copyright notice appear in all copies and that both that copyright | |
10 | * notice and this permission notice appear in supporting documentation, and | |
11 | * that the name of the copyright holders not be used in advertising or | |
12 | * publicity pertaining to distribution of the software without specific, | |
13 | * written prior permission. The copyright holders make no representations | |
14 | * about the suitability of this software for any purpose. It is provided "as | |
15 | * is" without express or implied warranty. | |
16 | * | |
17 | * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, | |
18 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO | |
19 | * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR | |
20 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, | |
21 | * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER | |
22 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE | |
23 | * OF THIS SOFTWARE. | |
24 | * | |
25 | * Authors: | |
26 | * Keith Packard | |
27 | * Eric Anholt <eric@anholt.net> | |
28 | * Dave Airlie <airlied@linux.ie> | |
29 | * Jesse Barnes <jesse.barnes@intel.com> | |
30 | */ | |
31 | ||
32 | #include <linux/export.h> | |
33 | #include <linux/moduleparam.h> | |
34 | ||
35 | #include <drm/drmP.h> | |
36 | #include <drm/drm_crtc.h> | |
37 | #include <drm/drm_fourcc.h> | |
38 | #include <drm/drm_crtc_helper.h> | |
39 | #include <drm/drm_fb_helper.h> | |
40 | #include <drm/drm_edid.h> | |
41 | ||
42 | /** | |
43 | * DOC: output probing helper overview | |
44 | * | |
45 | * This library provides some helper code for output probing. It provides an | |
46 | * implementation of the core connector->fill_modes interface with | |
47 | * drm_helper_probe_single_connector_modes. | |
48 | * | |
49 | * It also provides support for polling connectors with a work item and for | |
50 | * generic hotplug interrupt handling where the driver doesn't or cannot keep | |
51 | * track of a per-connector hpd interrupt. | |
52 | * | |
53 | * This helper library can be used independently of the modeset helper library. | |
54 | * Drivers can also overwrite different parts e.g. use their own hotplug | |
55 | * handling code to avoid probing unrelated outputs. | |
56 | */ | |
57 | ||
58 | static bool drm_kms_helper_poll = true; | |
59 | module_param_named(poll, drm_kms_helper_poll, bool, 0600); | |
60 | ||
05acaec3 VS |
61 | static enum drm_mode_status |
62 | drm_mode_validate_flag(const struct drm_display_mode *mode, | |
63 | int flags) | |
8d754544 | 64 | { |
05acaec3 VS |
65 | if ((mode->flags & DRM_MODE_FLAG_INTERLACE) && |
66 | !(flags & DRM_MODE_FLAG_INTERLACE)) | |
67 | return MODE_NO_INTERLACE; | |
8d754544 | 68 | |
05acaec3 VS |
69 | if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) && |
70 | !(flags & DRM_MODE_FLAG_DBLSCAN)) | |
71 | return MODE_NO_DBLESCAN; | |
8d754544 | 72 | |
05acaec3 VS |
73 | if ((mode->flags & DRM_MODE_FLAG_3D_MASK) && |
74 | !(flags & DRM_MODE_FLAG_3D_MASK)) | |
75 | return MODE_NO_STEREO; | |
8d754544 | 76 | |
05acaec3 | 77 | return MODE_OK; |
8d754544 DV |
78 | } |
79 | ||
eaf99c74 CW |
80 | static int drm_helper_probe_add_cmdline_mode(struct drm_connector *connector) |
81 | { | |
82 | struct drm_display_mode *mode; | |
83 | ||
84 | if (!connector->cmdline_mode.specified) | |
85 | return 0; | |
86 | ||
87 | mode = drm_mode_create_from_cmdline_mode(connector->dev, | |
88 | &connector->cmdline_mode); | |
89 | if (mode == NULL) | |
90 | return 0; | |
91 | ||
92 | drm_mode_probed_add(connector, mode); | |
93 | return 1; | |
94 | } | |
95 | ||
b87577b7 DA |
96 | static int drm_helper_probe_single_connector_modes_merge_bits(struct drm_connector *connector, |
97 | uint32_t maxX, uint32_t maxY, bool merge_type_bits) | |
8d754544 DV |
98 | { |
99 | struct drm_device *dev = connector->dev; | |
100 | struct drm_display_mode *mode; | |
be26a66d | 101 | const struct drm_connector_helper_funcs *connector_funcs = |
8d754544 DV |
102 | connector->helper_private; |
103 | int count = 0; | |
104 | int mode_flags = 0; | |
105 | bool verbose_prune = true; | |
162b6a57 | 106 | enum drm_connector_status old_status; |
8d754544 DV |
107 | |
108 | WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); | |
109 | ||
110 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, | |
25933820 | 111 | connector->name); |
8d754544 DV |
112 | /* set all modes to the unverified state */ |
113 | list_for_each_entry(mode, &connector->modes, head) | |
114 | mode->status = MODE_UNVERIFIED; | |
115 | ||
116 | if (connector->force) { | |
2c4cc91b PH |
117 | if (connector->force == DRM_FORCE_ON || |
118 | connector->force == DRM_FORCE_ON_DIGITAL) | |
8d754544 DV |
119 | connector->status = connector_status_connected; |
120 | else | |
121 | connector->status = connector_status_disconnected; | |
122 | if (connector->funcs->force) | |
123 | connector->funcs->force(connector); | |
124 | } else { | |
162b6a57 DV |
125 | old_status = connector->status; |
126 | ||
8d754544 | 127 | connector->status = connector->funcs->detect(connector, true); |
162b6a57 DV |
128 | |
129 | /* | |
130 | * Normally either the driver's hpd code or the poll loop should | |
131 | * pick up any changes and fire the hotplug event. But if | |
132 | * userspace sneaks in a probe, we might miss a change. Hence | |
133 | * check here, and if anything changed start the hotplug code. | |
134 | */ | |
135 | if (old_status != connector->status) { | |
136 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n", | |
137 | connector->base.id, | |
138 | connector->name, | |
139 | old_status, connector->status); | |
140 | ||
141 | /* | |
142 | * The hotplug event code might call into the fb | |
143 | * helpers, and so expects that we do not hold any | |
144 | * locks. Fire up the poll struct instead, it will | |
145 | * disable itself again. | |
146 | */ | |
147 | dev->mode_config.delayed_event = true; | |
148 | if (dev->mode_config.poll_enabled) | |
149 | schedule_delayed_work(&dev->mode_config.output_poll_work, | |
150 | 0); | |
151 | } | |
8d754544 DV |
152 | } |
153 | ||
154 | /* Re-enable polling in case the global poll config changed. */ | |
155 | if (drm_kms_helper_poll != dev->mode_config.poll_running) | |
156 | drm_kms_helper_poll_enable(dev); | |
157 | ||
158 | dev->mode_config.poll_running = drm_kms_helper_poll; | |
159 | ||
160 | if (connector->status == connector_status_disconnected) { | |
161 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n", | |
25933820 | 162 | connector->base.id, connector->name); |
8d754544 DV |
163 | drm_mode_connector_update_edid_property(connector, NULL); |
164 | verbose_prune = false; | |
165 | goto prune; | |
166 | } | |
167 | ||
168 | #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE | |
169 | count = drm_load_edid_firmware(connector); | |
170 | if (count == 0) | |
171 | #endif | |
4cf2b281 TW |
172 | { |
173 | if (connector->override_edid) { | |
174 | struct edid *edid = (struct edid *) connector->edid_blob_ptr->data; | |
175 | ||
176 | count = drm_add_edid_modes(connector, edid); | |
ad692b46 | 177 | drm_edid_to_eld(connector, edid); |
4cf2b281 TW |
178 | } else |
179 | count = (*connector_funcs->get_modes)(connector); | |
180 | } | |
8d754544 DV |
181 | |
182 | if (count == 0 && connector->status == connector_status_connected) | |
183 | count = drm_add_modes_noedid(connector, 1024, 768); | |
eaf99c74 | 184 | count += drm_helper_probe_add_cmdline_mode(connector); |
8d754544 DV |
185 | if (count == 0) |
186 | goto prune; | |
187 | ||
b87577b7 | 188 | drm_mode_connector_list_update(connector, merge_type_bits); |
8d754544 | 189 | |
8d754544 DV |
190 | if (connector->interlace_allowed) |
191 | mode_flags |= DRM_MODE_FLAG_INTERLACE; | |
192 | if (connector->doublescan_allowed) | |
193 | mode_flags |= DRM_MODE_FLAG_DBLSCAN; | |
194 | if (connector->stereo_allowed) | |
195 | mode_flags |= DRM_MODE_FLAG_3D_MASK; | |
8d754544 DV |
196 | |
197 | list_for_each_entry(mode, &connector->modes, head) { | |
abc0b144 VS |
198 | mode->status = drm_mode_validate_basic(mode); |
199 | ||
200 | if (mode->status == MODE_OK) | |
201 | mode->status = drm_mode_validate_size(mode, maxX, maxY); | |
05acaec3 VS |
202 | |
203 | if (mode->status == MODE_OK) | |
204 | mode->status = drm_mode_validate_flag(mode, mode_flags); | |
205 | ||
f9b0e251 | 206 | if (mode->status == MODE_OK && connector_funcs->mode_valid) |
8d754544 DV |
207 | mode->status = connector_funcs->mode_valid(connector, |
208 | mode); | |
209 | } | |
210 | ||
211 | prune: | |
212 | drm_mode_prune_invalid(dev, &connector->modes, verbose_prune); | |
213 | ||
214 | if (list_empty(&connector->modes)) | |
215 | return 0; | |
216 | ||
217 | list_for_each_entry(mode, &connector->modes, head) | |
218 | mode->vrefresh = drm_mode_vrefresh(mode); | |
219 | ||
220 | drm_mode_sort(&connector->modes); | |
221 | ||
222 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id, | |
25933820 | 223 | connector->name); |
8d754544 DV |
224 | list_for_each_entry(mode, &connector->modes, head) { |
225 | drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V); | |
226 | drm_mode_debug_printmodeline(mode); | |
227 | } | |
228 | ||
229 | return count; | |
230 | } | |
b87577b7 DA |
231 | |
232 | /** | |
233 | * drm_helper_probe_single_connector_modes - get complete set of display modes | |
234 | * @connector: connector to probe | |
235 | * @maxX: max width for modes | |
236 | * @maxY: max height for modes | |
237 | * | |
238 | * Based on the helper callbacks implemented by @connector try to detect all | |
239 | * valid modes. Modes will first be added to the connector's probed_modes list, | |
240 | * then culled (based on validity and the @maxX, @maxY parameters) and put into | |
241 | * the normal modes list. | |
242 | * | |
243 | * Intended to be use as a generic implementation of the ->fill_modes() | |
244 | * @connector vfunc for drivers that use the crtc helpers for output mode | |
245 | * filtering and detection. | |
246 | * | |
247 | * Returns: | |
248 | * The number of modes found on @connector. | |
249 | */ | |
250 | int drm_helper_probe_single_connector_modes(struct drm_connector *connector, | |
251 | uint32_t maxX, uint32_t maxY) | |
252 | { | |
253 | return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, true); | |
254 | } | |
8d754544 DV |
255 | EXPORT_SYMBOL(drm_helper_probe_single_connector_modes); |
256 | ||
b87577b7 DA |
257 | /** |
258 | * drm_helper_probe_single_connector_modes_nomerge - get complete set of display modes | |
259 | * @connector: connector to probe | |
260 | * @maxX: max width for modes | |
261 | * @maxY: max height for modes | |
262 | * | |
263 | * This operates like drm_hehlper_probe_single_connector_modes except it | |
264 | * replaces the mode bits instead of merging them for preferred modes. | |
265 | */ | |
266 | int drm_helper_probe_single_connector_modes_nomerge(struct drm_connector *connector, | |
267 | uint32_t maxX, uint32_t maxY) | |
268 | { | |
269 | return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, false); | |
270 | } | |
271 | EXPORT_SYMBOL(drm_helper_probe_single_connector_modes_nomerge); | |
272 | ||
8d754544 DV |
273 | /** |
274 | * drm_kms_helper_hotplug_event - fire off KMS hotplug events | |
275 | * @dev: drm_device whose connector state changed | |
276 | * | |
277 | * This function fires off the uevent for userspace and also calls the | |
278 | * output_poll_changed function, which is most commonly used to inform the fbdev | |
279 | * emulation code and allow it to update the fbcon output configuration. | |
280 | * | |
281 | * Drivers should call this from their hotplug handling code when a change is | |
282 | * detected. Note that this function does not do any output detection of its | |
283 | * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the | |
284 | * driver already. | |
285 | * | |
286 | * This function must be called from process context with no mode | |
287 | * setting locks held. | |
288 | */ | |
289 | void drm_kms_helper_hotplug_event(struct drm_device *dev) | |
290 | { | |
291 | /* send a uevent + call fbdev */ | |
292 | drm_sysfs_hotplug_event(dev); | |
293 | if (dev->mode_config.funcs->output_poll_changed) | |
294 | dev->mode_config.funcs->output_poll_changed(dev); | |
295 | } | |
296 | EXPORT_SYMBOL(drm_kms_helper_hotplug_event); | |
297 | ||
298 | #define DRM_OUTPUT_POLL_PERIOD (10*HZ) | |
299 | static void output_poll_execute(struct work_struct *work) | |
300 | { | |
301 | struct delayed_work *delayed_work = to_delayed_work(work); | |
302 | struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work); | |
303 | struct drm_connector *connector; | |
304 | enum drm_connector_status old_status; | |
162b6a57 DV |
305 | bool repoll = false, changed; |
306 | ||
307 | /* Pick up any changes detected by the probe functions. */ | |
308 | changed = dev->mode_config.delayed_event; | |
309 | dev->mode_config.delayed_event = false; | |
8d754544 DV |
310 | |
311 | if (!drm_kms_helper_poll) | |
162b6a57 | 312 | goto out; |
8d754544 DV |
313 | |
314 | mutex_lock(&dev->mode_config.mutex); | |
315 | list_for_each_entry(connector, &dev->mode_config.connector_list, head) { | |
316 | ||
317 | /* Ignore forced connectors. */ | |
318 | if (connector->force) | |
319 | continue; | |
320 | ||
321 | /* Ignore HPD capable connectors and connectors where we don't | |
322 | * want any hotplug detection at all for polling. */ | |
323 | if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD) | |
324 | continue; | |
325 | ||
8d754544 DV |
326 | old_status = connector->status; |
327 | /* if we are connected and don't want to poll for disconnect | |
328 | skip it */ | |
329 | if (old_status == connector_status_connected && | |
330 | !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT)) | |
331 | continue; | |
332 | ||
a3c6d686 JH |
333 | repoll = true; |
334 | ||
8d754544 DV |
335 | connector->status = connector->funcs->detect(connector, false); |
336 | if (old_status != connector->status) { | |
337 | const char *old, *new; | |
338 | ||
b7703726 DV |
339 | /* |
340 | * The poll work sets force=false when calling detect so | |
341 | * that drivers can avoid to do disruptive tests (e.g. | |
342 | * when load detect cycles could cause flickering on | |
343 | * other, running displays). This bears the risk that we | |
344 | * flip-flop between unknown here in the poll work and | |
345 | * the real state when userspace forces a full detect | |
346 | * call after receiving a hotplug event due to this | |
347 | * change. | |
348 | * | |
349 | * Hence clamp an unknown detect status to the old | |
350 | * value. | |
351 | */ | |
352 | if (connector->status == connector_status_unknown) { | |
353 | connector->status = old_status; | |
354 | continue; | |
355 | } | |
356 | ||
8d754544 DV |
357 | old = drm_get_connector_status_name(old_status); |
358 | new = drm_get_connector_status_name(connector->status); | |
359 | ||
360 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] " | |
361 | "status updated from %s to %s\n", | |
362 | connector->base.id, | |
25933820 | 363 | connector->name, |
8d754544 DV |
364 | old, new); |
365 | ||
366 | changed = true; | |
367 | } | |
368 | } | |
369 | ||
370 | mutex_unlock(&dev->mode_config.mutex); | |
371 | ||
162b6a57 | 372 | out: |
8d754544 DV |
373 | if (changed) |
374 | drm_kms_helper_hotplug_event(dev); | |
375 | ||
376 | if (repoll) | |
377 | schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD); | |
378 | } | |
379 | ||
380 | /** | |
381 | * drm_kms_helper_poll_disable - disable output polling | |
382 | * @dev: drm_device | |
383 | * | |
384 | * This function disables the output polling work. | |
385 | * | |
386 | * Drivers can call this helper from their device suspend implementation. It is | |
387 | * not an error to call this even when output polling isn't enabled or arlready | |
388 | * disabled. | |
389 | */ | |
390 | void drm_kms_helper_poll_disable(struct drm_device *dev) | |
391 | { | |
392 | if (!dev->mode_config.poll_enabled) | |
393 | return; | |
394 | cancel_delayed_work_sync(&dev->mode_config.output_poll_work); | |
395 | } | |
396 | EXPORT_SYMBOL(drm_kms_helper_poll_disable); | |
397 | ||
398 | /** | |
399 | * drm_kms_helper_poll_enable - re-enable output polling. | |
400 | * @dev: drm_device | |
401 | * | |
402 | * This function re-enables the output polling work. | |
403 | * | |
404 | * Drivers can call this helper from their device resume implementation. It is | |
405 | * an error to call this when the output polling support has not yet been set | |
406 | * up. | |
407 | */ | |
408 | void drm_kms_helper_poll_enable(struct drm_device *dev) | |
409 | { | |
410 | bool poll = false; | |
411 | struct drm_connector *connector; | |
412 | ||
413 | if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll) | |
414 | return; | |
415 | ||
416 | list_for_each_entry(connector, &dev->mode_config.connector_list, head) { | |
417 | if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | | |
418 | DRM_CONNECTOR_POLL_DISCONNECT)) | |
419 | poll = true; | |
420 | } | |
421 | ||
422 | if (poll) | |
423 | schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD); | |
424 | } | |
425 | EXPORT_SYMBOL(drm_kms_helper_poll_enable); | |
426 | ||
427 | /** | |
428 | * drm_kms_helper_poll_init - initialize and enable output polling | |
429 | * @dev: drm_device | |
430 | * | |
431 | * This function intializes and then also enables output polling support for | |
432 | * @dev. Drivers which do not have reliable hotplug support in hardware can use | |
433 | * this helper infrastructure to regularly poll such connectors for changes in | |
434 | * their connection state. | |
435 | * | |
436 | * Drivers can control which connectors are polled by setting the | |
437 | * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On | |
438 | * connectors where probing live outputs can result in visual distortion drivers | |
439 | * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this. | |
440 | * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are | |
441 | * completely ignored by the polling logic. | |
442 | * | |
443 | * Note that a connector can be both polled and probed from the hotplug handler, | |
444 | * in case the hotplug interrupt is known to be unreliable. | |
445 | */ | |
446 | void drm_kms_helper_poll_init(struct drm_device *dev) | |
447 | { | |
448 | INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute); | |
449 | dev->mode_config.poll_enabled = true; | |
450 | ||
451 | drm_kms_helper_poll_enable(dev); | |
452 | } | |
453 | EXPORT_SYMBOL(drm_kms_helper_poll_init); | |
454 | ||
455 | /** | |
456 | * drm_kms_helper_poll_fini - disable output polling and clean it up | |
457 | * @dev: drm_device | |
458 | */ | |
459 | void drm_kms_helper_poll_fini(struct drm_device *dev) | |
460 | { | |
461 | drm_kms_helper_poll_disable(dev); | |
462 | } | |
463 | EXPORT_SYMBOL(drm_kms_helper_poll_fini); | |
464 | ||
465 | /** | |
466 | * drm_helper_hpd_irq_event - hotplug processing | |
467 | * @dev: drm_device | |
468 | * | |
469 | * Drivers can use this helper function to run a detect cycle on all connectors | |
470 | * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All | |
471 | * other connectors are ignored, which is useful to avoid reprobing fixed | |
472 | * panels. | |
473 | * | |
474 | * This helper function is useful for drivers which can't or don't track hotplug | |
475 | * interrupts for each connector. | |
476 | * | |
477 | * Drivers which support hotplug interrupts for each connector individually and | |
478 | * which have a more fine-grained detect logic should bypass this code and | |
479 | * directly call drm_kms_helper_hotplug_event() in case the connector state | |
480 | * changed. | |
481 | * | |
482 | * This function must be called from process context with no mode | |
483 | * setting locks held. | |
484 | * | |
485 | * Note that a connector can be both polled and probed from the hotplug handler, | |
486 | * in case the hotplug interrupt is known to be unreliable. | |
487 | */ | |
488 | bool drm_helper_hpd_irq_event(struct drm_device *dev) | |
489 | { | |
490 | struct drm_connector *connector; | |
491 | enum drm_connector_status old_status; | |
492 | bool changed = false; | |
493 | ||
494 | if (!dev->mode_config.poll_enabled) | |
495 | return false; | |
496 | ||
497 | mutex_lock(&dev->mode_config.mutex); | |
498 | list_for_each_entry(connector, &dev->mode_config.connector_list, head) { | |
499 | ||
500 | /* Only handle HPD capable connectors. */ | |
501 | if (!(connector->polled & DRM_CONNECTOR_POLL_HPD)) | |
502 | continue; | |
503 | ||
504 | old_status = connector->status; | |
505 | ||
506 | connector->status = connector->funcs->detect(connector, false); | |
507 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", | |
508 | connector->base.id, | |
25933820 | 509 | connector->name, |
8d754544 DV |
510 | drm_get_connector_status_name(old_status), |
511 | drm_get_connector_status_name(connector->status)); | |
512 | if (old_status != connector->status) | |
513 | changed = true; | |
514 | } | |
515 | ||
516 | mutex_unlock(&dev->mode_config.mutex); | |
517 | ||
518 | if (changed) | |
519 | drm_kms_helper_hotplug_event(dev); | |
520 | ||
521 | return changed; | |
522 | } | |
523 | EXPORT_SYMBOL(drm_helper_hpd_irq_event); |