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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 | ||
8c4ccc4a | 96 | #define DRM_OUTPUT_POLL_PERIOD (10*HZ) |
4ad640e9 EE |
97 | /** |
98 | * drm_kms_helper_poll_enable_locked - re-enable output polling. | |
99 | * @dev: drm_device | |
100 | * | |
101 | * This function re-enables the output polling work without | |
102 | * locking the mode_config mutex. | |
103 | * | |
104 | * This is like drm_kms_helper_poll_enable() however it is to be | |
105 | * called from a context where the mode_config mutex is locked | |
106 | * already. | |
107 | */ | |
108 | void drm_kms_helper_poll_enable_locked(struct drm_device *dev) | |
8c4ccc4a DV |
109 | { |
110 | bool poll = false; | |
111 | struct drm_connector *connector; | |
112 | ||
113 | WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); | |
114 | ||
115 | if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll) | |
116 | return; | |
117 | ||
118 | drm_for_each_connector(connector, dev) { | |
119 | if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | | |
120 | DRM_CONNECTOR_POLL_DISCONNECT)) | |
121 | poll = true; | |
122 | } | |
123 | ||
124 | if (poll) | |
125 | schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD); | |
126 | } | |
4ad640e9 EE |
127 | EXPORT_SYMBOL(drm_kms_helper_poll_enable_locked); |
128 | ||
8c4ccc4a | 129 | |
b87577b7 DA |
130 | static int drm_helper_probe_single_connector_modes_merge_bits(struct drm_connector *connector, |
131 | uint32_t maxX, uint32_t maxY, bool merge_type_bits) | |
8d754544 DV |
132 | { |
133 | struct drm_device *dev = connector->dev; | |
134 | struct drm_display_mode *mode; | |
be26a66d | 135 | const struct drm_connector_helper_funcs *connector_funcs = |
8d754544 DV |
136 | connector->helper_private; |
137 | int count = 0; | |
138 | int mode_flags = 0; | |
139 | bool verbose_prune = true; | |
162b6a57 | 140 | enum drm_connector_status old_status; |
8d754544 DV |
141 | |
142 | WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); | |
143 | ||
144 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, | |
25933820 | 145 | connector->name); |
8d754544 DV |
146 | /* set all modes to the unverified state */ |
147 | list_for_each_entry(mode, &connector->modes, head) | |
148 | mode->status = MODE_UNVERIFIED; | |
149 | ||
150 | if (connector->force) { | |
2c4cc91b PH |
151 | if (connector->force == DRM_FORCE_ON || |
152 | connector->force == DRM_FORCE_ON_DIGITAL) | |
8d754544 DV |
153 | connector->status = connector_status_connected; |
154 | else | |
155 | connector->status = connector_status_disconnected; | |
156 | if (connector->funcs->force) | |
157 | connector->funcs->force(connector); | |
158 | } else { | |
162b6a57 DV |
159 | old_status = connector->status; |
160 | ||
8d754544 | 161 | connector->status = connector->funcs->detect(connector, true); |
162b6a57 DV |
162 | |
163 | /* | |
164 | * Normally either the driver's hpd code or the poll loop should | |
165 | * pick up any changes and fire the hotplug event. But if | |
166 | * userspace sneaks in a probe, we might miss a change. Hence | |
167 | * check here, and if anything changed start the hotplug code. | |
168 | */ | |
169 | if (old_status != connector->status) { | |
170 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n", | |
171 | connector->base.id, | |
172 | connector->name, | |
173 | old_status, connector->status); | |
174 | ||
175 | /* | |
176 | * The hotplug event code might call into the fb | |
177 | * helpers, and so expects that we do not hold any | |
178 | * locks. Fire up the poll struct instead, it will | |
179 | * disable itself again. | |
180 | */ | |
181 | dev->mode_config.delayed_event = true; | |
182 | if (dev->mode_config.poll_enabled) | |
183 | schedule_delayed_work(&dev->mode_config.output_poll_work, | |
184 | 0); | |
185 | } | |
8d754544 DV |
186 | } |
187 | ||
188 | /* Re-enable polling in case the global poll config changed. */ | |
189 | if (drm_kms_helper_poll != dev->mode_config.poll_running) | |
4ad640e9 | 190 | drm_kms_helper_poll_enable_locked(dev); |
8d754544 DV |
191 | |
192 | dev->mode_config.poll_running = drm_kms_helper_poll; | |
193 | ||
194 | if (connector->status == connector_status_disconnected) { | |
195 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n", | |
25933820 | 196 | connector->base.id, connector->name); |
8d754544 DV |
197 | drm_mode_connector_update_edid_property(connector, NULL); |
198 | verbose_prune = false; | |
199 | goto prune; | |
200 | } | |
201 | ||
202 | #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE | |
203 | count = drm_load_edid_firmware(connector); | |
204 | if (count == 0) | |
205 | #endif | |
4cf2b281 TW |
206 | { |
207 | if (connector->override_edid) { | |
208 | struct edid *edid = (struct edid *) connector->edid_blob_ptr->data; | |
209 | ||
210 | count = drm_add_edid_modes(connector, edid); | |
ad692b46 | 211 | drm_edid_to_eld(connector, edid); |
4cf2b281 TW |
212 | } else |
213 | count = (*connector_funcs->get_modes)(connector); | |
214 | } | |
8d754544 DV |
215 | |
216 | if (count == 0 && connector->status == connector_status_connected) | |
217 | count = drm_add_modes_noedid(connector, 1024, 768); | |
eaf99c74 | 218 | count += drm_helper_probe_add_cmdline_mode(connector); |
8d754544 DV |
219 | if (count == 0) |
220 | goto prune; | |
221 | ||
b87577b7 | 222 | drm_mode_connector_list_update(connector, merge_type_bits); |
8d754544 | 223 | |
8d754544 DV |
224 | if (connector->interlace_allowed) |
225 | mode_flags |= DRM_MODE_FLAG_INTERLACE; | |
226 | if (connector->doublescan_allowed) | |
227 | mode_flags |= DRM_MODE_FLAG_DBLSCAN; | |
228 | if (connector->stereo_allowed) | |
229 | mode_flags |= DRM_MODE_FLAG_3D_MASK; | |
8d754544 DV |
230 | |
231 | list_for_each_entry(mode, &connector->modes, head) { | |
4655a12b VS |
232 | if (mode->status == MODE_OK) |
233 | mode->status = drm_mode_validate_basic(mode); | |
abc0b144 VS |
234 | |
235 | if (mode->status == MODE_OK) | |
236 | mode->status = drm_mode_validate_size(mode, maxX, maxY); | |
05acaec3 VS |
237 | |
238 | if (mode->status == MODE_OK) | |
239 | mode->status = drm_mode_validate_flag(mode, mode_flags); | |
240 | ||
f9b0e251 | 241 | if (mode->status == MODE_OK && connector_funcs->mode_valid) |
8d754544 DV |
242 | mode->status = connector_funcs->mode_valid(connector, |
243 | mode); | |
244 | } | |
245 | ||
246 | prune: | |
247 | drm_mode_prune_invalid(dev, &connector->modes, verbose_prune); | |
248 | ||
249 | if (list_empty(&connector->modes)) | |
250 | return 0; | |
251 | ||
252 | list_for_each_entry(mode, &connector->modes, head) | |
253 | mode->vrefresh = drm_mode_vrefresh(mode); | |
254 | ||
255 | drm_mode_sort(&connector->modes); | |
256 | ||
257 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id, | |
25933820 | 258 | connector->name); |
8d754544 DV |
259 | list_for_each_entry(mode, &connector->modes, head) { |
260 | drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V); | |
261 | drm_mode_debug_printmodeline(mode); | |
262 | } | |
263 | ||
264 | return count; | |
265 | } | |
b87577b7 DA |
266 | |
267 | /** | |
268 | * drm_helper_probe_single_connector_modes - get complete set of display modes | |
269 | * @connector: connector to probe | |
270 | * @maxX: max width for modes | |
271 | * @maxY: max height for modes | |
272 | * | |
273 | * Based on the helper callbacks implemented by @connector try to detect all | |
274 | * valid modes. Modes will first be added to the connector's probed_modes list, | |
275 | * then culled (based on validity and the @maxX, @maxY parameters) and put into | |
276 | * the normal modes list. | |
277 | * | |
278 | * Intended to be use as a generic implementation of the ->fill_modes() | |
279 | * @connector vfunc for drivers that use the crtc helpers for output mode | |
280 | * filtering and detection. | |
281 | * | |
282 | * Returns: | |
283 | * The number of modes found on @connector. | |
284 | */ | |
285 | int drm_helper_probe_single_connector_modes(struct drm_connector *connector, | |
286 | uint32_t maxX, uint32_t maxY) | |
287 | { | |
288 | return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, true); | |
289 | } | |
8d754544 DV |
290 | EXPORT_SYMBOL(drm_helper_probe_single_connector_modes); |
291 | ||
b87577b7 DA |
292 | /** |
293 | * drm_helper_probe_single_connector_modes_nomerge - get complete set of display modes | |
294 | * @connector: connector to probe | |
295 | * @maxX: max width for modes | |
296 | * @maxY: max height for modes | |
297 | * | |
298 | * This operates like drm_hehlper_probe_single_connector_modes except it | |
299 | * replaces the mode bits instead of merging them for preferred modes. | |
300 | */ | |
301 | int drm_helper_probe_single_connector_modes_nomerge(struct drm_connector *connector, | |
302 | uint32_t maxX, uint32_t maxY) | |
303 | { | |
304 | return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, false); | |
305 | } | |
306 | EXPORT_SYMBOL(drm_helper_probe_single_connector_modes_nomerge); | |
307 | ||
8d754544 DV |
308 | /** |
309 | * drm_kms_helper_hotplug_event - fire off KMS hotplug events | |
310 | * @dev: drm_device whose connector state changed | |
311 | * | |
312 | * This function fires off the uevent for userspace and also calls the | |
313 | * output_poll_changed function, which is most commonly used to inform the fbdev | |
314 | * emulation code and allow it to update the fbcon output configuration. | |
315 | * | |
316 | * Drivers should call this from their hotplug handling code when a change is | |
317 | * detected. Note that this function does not do any output detection of its | |
318 | * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the | |
319 | * driver already. | |
320 | * | |
321 | * This function must be called from process context with no mode | |
322 | * setting locks held. | |
323 | */ | |
324 | void drm_kms_helper_hotplug_event(struct drm_device *dev) | |
325 | { | |
326 | /* send a uevent + call fbdev */ | |
327 | drm_sysfs_hotplug_event(dev); | |
328 | if (dev->mode_config.funcs->output_poll_changed) | |
329 | dev->mode_config.funcs->output_poll_changed(dev); | |
330 | } | |
331 | EXPORT_SYMBOL(drm_kms_helper_hotplug_event); | |
332 | ||
8d754544 DV |
333 | static void output_poll_execute(struct work_struct *work) |
334 | { | |
335 | struct delayed_work *delayed_work = to_delayed_work(work); | |
336 | struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work); | |
337 | struct drm_connector *connector; | |
338 | enum drm_connector_status old_status; | |
162b6a57 DV |
339 | bool repoll = false, changed; |
340 | ||
341 | /* Pick up any changes detected by the probe functions. */ | |
342 | changed = dev->mode_config.delayed_event; | |
343 | dev->mode_config.delayed_event = false; | |
8d754544 DV |
344 | |
345 | if (!drm_kms_helper_poll) | |
162b6a57 | 346 | goto out; |
8d754544 DV |
347 | |
348 | mutex_lock(&dev->mode_config.mutex); | |
6295d607 | 349 | drm_for_each_connector(connector, dev) { |
8d754544 DV |
350 | |
351 | /* Ignore forced connectors. */ | |
352 | if (connector->force) | |
353 | continue; | |
354 | ||
355 | /* Ignore HPD capable connectors and connectors where we don't | |
356 | * want any hotplug detection at all for polling. */ | |
357 | if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD) | |
358 | continue; | |
359 | ||
8d754544 DV |
360 | old_status = connector->status; |
361 | /* if we are connected and don't want to poll for disconnect | |
362 | skip it */ | |
363 | if (old_status == connector_status_connected && | |
364 | !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT)) | |
365 | continue; | |
366 | ||
a3c6d686 JH |
367 | repoll = true; |
368 | ||
8d754544 DV |
369 | connector->status = connector->funcs->detect(connector, false); |
370 | if (old_status != connector->status) { | |
371 | const char *old, *new; | |
372 | ||
b7703726 DV |
373 | /* |
374 | * The poll work sets force=false when calling detect so | |
375 | * that drivers can avoid to do disruptive tests (e.g. | |
376 | * when load detect cycles could cause flickering on | |
377 | * other, running displays). This bears the risk that we | |
378 | * flip-flop between unknown here in the poll work and | |
379 | * the real state when userspace forces a full detect | |
380 | * call after receiving a hotplug event due to this | |
381 | * change. | |
382 | * | |
383 | * Hence clamp an unknown detect status to the old | |
384 | * value. | |
385 | */ | |
386 | if (connector->status == connector_status_unknown) { | |
387 | connector->status = old_status; | |
388 | continue; | |
389 | } | |
390 | ||
8d754544 DV |
391 | old = drm_get_connector_status_name(old_status); |
392 | new = drm_get_connector_status_name(connector->status); | |
393 | ||
394 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] " | |
395 | "status updated from %s to %s\n", | |
396 | connector->base.id, | |
25933820 | 397 | connector->name, |
8d754544 DV |
398 | old, new); |
399 | ||
400 | changed = true; | |
401 | } | |
402 | } | |
403 | ||
404 | mutex_unlock(&dev->mode_config.mutex); | |
405 | ||
162b6a57 | 406 | out: |
8d754544 DV |
407 | if (changed) |
408 | drm_kms_helper_hotplug_event(dev); | |
409 | ||
410 | if (repoll) | |
411 | schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD); | |
412 | } | |
413 | ||
414 | /** | |
415 | * drm_kms_helper_poll_disable - disable output polling | |
416 | * @dev: drm_device | |
417 | * | |
418 | * This function disables the output polling work. | |
419 | * | |
420 | * Drivers can call this helper from their device suspend implementation. It is | |
421 | * not an error to call this even when output polling isn't enabled or arlready | |
422 | * disabled. | |
423 | */ | |
424 | void drm_kms_helper_poll_disable(struct drm_device *dev) | |
425 | { | |
426 | if (!dev->mode_config.poll_enabled) | |
427 | return; | |
428 | cancel_delayed_work_sync(&dev->mode_config.output_poll_work); | |
429 | } | |
430 | EXPORT_SYMBOL(drm_kms_helper_poll_disable); | |
431 | ||
432 | /** | |
433 | * drm_kms_helper_poll_enable - re-enable output polling. | |
434 | * @dev: drm_device | |
435 | * | |
436 | * This function re-enables the output polling work. | |
437 | * | |
438 | * Drivers can call this helper from their device resume implementation. It is | |
439 | * an error to call this when the output polling support has not yet been set | |
440 | * up. | |
441 | */ | |
442 | void drm_kms_helper_poll_enable(struct drm_device *dev) | |
443 | { | |
8c4ccc4a | 444 | mutex_lock(&dev->mode_config.mutex); |
4ad640e9 | 445 | drm_kms_helper_poll_enable_locked(dev); |
8c4ccc4a | 446 | mutex_unlock(&dev->mode_config.mutex); |
8d754544 DV |
447 | } |
448 | EXPORT_SYMBOL(drm_kms_helper_poll_enable); | |
449 | ||
450 | /** | |
451 | * drm_kms_helper_poll_init - initialize and enable output polling | |
452 | * @dev: drm_device | |
453 | * | |
454 | * This function intializes and then also enables output polling support for | |
455 | * @dev. Drivers which do not have reliable hotplug support in hardware can use | |
456 | * this helper infrastructure to regularly poll such connectors for changes in | |
457 | * their connection state. | |
458 | * | |
459 | * Drivers can control which connectors are polled by setting the | |
460 | * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On | |
461 | * connectors where probing live outputs can result in visual distortion drivers | |
462 | * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this. | |
463 | * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are | |
464 | * completely ignored by the polling logic. | |
465 | * | |
466 | * Note that a connector can be both polled and probed from the hotplug handler, | |
467 | * in case the hotplug interrupt is known to be unreliable. | |
468 | */ | |
469 | void drm_kms_helper_poll_init(struct drm_device *dev) | |
470 | { | |
471 | INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute); | |
472 | dev->mode_config.poll_enabled = true; | |
473 | ||
474 | drm_kms_helper_poll_enable(dev); | |
475 | } | |
476 | EXPORT_SYMBOL(drm_kms_helper_poll_init); | |
477 | ||
478 | /** | |
479 | * drm_kms_helper_poll_fini - disable output polling and clean it up | |
480 | * @dev: drm_device | |
481 | */ | |
482 | void drm_kms_helper_poll_fini(struct drm_device *dev) | |
483 | { | |
484 | drm_kms_helper_poll_disable(dev); | |
485 | } | |
486 | EXPORT_SYMBOL(drm_kms_helper_poll_fini); | |
487 | ||
488 | /** | |
489 | * drm_helper_hpd_irq_event - hotplug processing | |
490 | * @dev: drm_device | |
491 | * | |
492 | * Drivers can use this helper function to run a detect cycle on all connectors | |
493 | * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All | |
494 | * other connectors are ignored, which is useful to avoid reprobing fixed | |
495 | * panels. | |
496 | * | |
497 | * This helper function is useful for drivers which can't or don't track hotplug | |
498 | * interrupts for each connector. | |
499 | * | |
500 | * Drivers which support hotplug interrupts for each connector individually and | |
501 | * which have a more fine-grained detect logic should bypass this code and | |
502 | * directly call drm_kms_helper_hotplug_event() in case the connector state | |
503 | * changed. | |
504 | * | |
505 | * This function must be called from process context with no mode | |
506 | * setting locks held. | |
507 | * | |
508 | * Note that a connector can be both polled and probed from the hotplug handler, | |
509 | * in case the hotplug interrupt is known to be unreliable. | |
510 | */ | |
511 | bool drm_helper_hpd_irq_event(struct drm_device *dev) | |
512 | { | |
513 | struct drm_connector *connector; | |
514 | enum drm_connector_status old_status; | |
515 | bool changed = false; | |
516 | ||
517 | if (!dev->mode_config.poll_enabled) | |
518 | return false; | |
519 | ||
520 | mutex_lock(&dev->mode_config.mutex); | |
6295d607 | 521 | drm_for_each_connector(connector, dev) { |
8d754544 DV |
522 | |
523 | /* Only handle HPD capable connectors. */ | |
524 | if (!(connector->polled & DRM_CONNECTOR_POLL_HPD)) | |
525 | continue; | |
526 | ||
527 | old_status = connector->status; | |
528 | ||
529 | connector->status = connector->funcs->detect(connector, false); | |
530 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", | |
531 | connector->base.id, | |
25933820 | 532 | connector->name, |
8d754544 DV |
533 | drm_get_connector_status_name(old_status), |
534 | drm_get_connector_status_name(connector->status)); | |
535 | if (old_status != connector->status) | |
536 | changed = true; | |
537 | } | |
538 | ||
539 | mutex_unlock(&dev->mode_config.mutex); | |
540 | ||
541 | if (changed) | |
542 | drm_kms_helper_hotplug_event(dev); | |
543 | ||
544 | return changed; | |
545 | } | |
546 | EXPORT_SYMBOL(drm_helper_hpd_irq_event); |