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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. | |
092d01da DV |
56 | * |
57 | * The probe helpers share the function table structures with other display | |
58 | * helper libraries. See struct &drm_connector_helper_funcs for the details. | |
8d754544 DV |
59 | */ |
60 | ||
61 | static bool drm_kms_helper_poll = true; | |
62 | module_param_named(poll, drm_kms_helper_poll, bool, 0600); | |
63 | ||
05acaec3 VS |
64 | static enum drm_mode_status |
65 | drm_mode_validate_flag(const struct drm_display_mode *mode, | |
66 | int flags) | |
8d754544 | 67 | { |
05acaec3 VS |
68 | if ((mode->flags & DRM_MODE_FLAG_INTERLACE) && |
69 | !(flags & DRM_MODE_FLAG_INTERLACE)) | |
70 | return MODE_NO_INTERLACE; | |
8d754544 | 71 | |
05acaec3 VS |
72 | if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) && |
73 | !(flags & DRM_MODE_FLAG_DBLSCAN)) | |
74 | return MODE_NO_DBLESCAN; | |
8d754544 | 75 | |
05acaec3 VS |
76 | if ((mode->flags & DRM_MODE_FLAG_3D_MASK) && |
77 | !(flags & DRM_MODE_FLAG_3D_MASK)) | |
78 | return MODE_NO_STEREO; | |
8d754544 | 79 | |
05acaec3 | 80 | return MODE_OK; |
8d754544 DV |
81 | } |
82 | ||
eaf99c74 CW |
83 | static int drm_helper_probe_add_cmdline_mode(struct drm_connector *connector) |
84 | { | |
85 | struct drm_display_mode *mode; | |
86 | ||
87 | if (!connector->cmdline_mode.specified) | |
88 | return 0; | |
89 | ||
90 | mode = drm_mode_create_from_cmdline_mode(connector->dev, | |
91 | &connector->cmdline_mode); | |
92 | if (mode == NULL) | |
93 | return 0; | |
94 | ||
95 | drm_mode_probed_add(connector, mode); | |
96 | return 1; | |
97 | } | |
98 | ||
8c4ccc4a | 99 | #define DRM_OUTPUT_POLL_PERIOD (10*HZ) |
4ad640e9 EE |
100 | /** |
101 | * drm_kms_helper_poll_enable_locked - re-enable output polling. | |
102 | * @dev: drm_device | |
103 | * | |
104 | * This function re-enables the output polling work without | |
105 | * locking the mode_config mutex. | |
106 | * | |
107 | * This is like drm_kms_helper_poll_enable() however it is to be | |
108 | * called from a context where the mode_config mutex is locked | |
109 | * already. | |
110 | */ | |
111 | void drm_kms_helper_poll_enable_locked(struct drm_device *dev) | |
8c4ccc4a DV |
112 | { |
113 | bool poll = false; | |
114 | struct drm_connector *connector; | |
115 | ||
116 | WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); | |
117 | ||
118 | if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll) | |
119 | return; | |
120 | ||
121 | drm_for_each_connector(connector, dev) { | |
122 | if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | | |
123 | DRM_CONNECTOR_POLL_DISCONNECT)) | |
124 | poll = true; | |
125 | } | |
126 | ||
127 | if (poll) | |
128 | schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD); | |
129 | } | |
4ad640e9 EE |
130 | EXPORT_SYMBOL(drm_kms_helper_poll_enable_locked); |
131 | ||
8c4ccc4a | 132 | |
b87577b7 DA |
133 | static int drm_helper_probe_single_connector_modes_merge_bits(struct drm_connector *connector, |
134 | uint32_t maxX, uint32_t maxY, bool merge_type_bits) | |
8d754544 DV |
135 | { |
136 | struct drm_device *dev = connector->dev; | |
137 | struct drm_display_mode *mode; | |
be26a66d | 138 | const struct drm_connector_helper_funcs *connector_funcs = |
8d754544 DV |
139 | connector->helper_private; |
140 | int count = 0; | |
141 | int mode_flags = 0; | |
142 | bool verbose_prune = true; | |
162b6a57 | 143 | enum drm_connector_status old_status; |
8d754544 DV |
144 | |
145 | WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); | |
146 | ||
147 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, | |
25933820 | 148 | connector->name); |
8d754544 DV |
149 | /* set all modes to the unverified state */ |
150 | list_for_each_entry(mode, &connector->modes, head) | |
151 | mode->status = MODE_UNVERIFIED; | |
152 | ||
ed293f77 DV |
153 | old_status = connector->status; |
154 | ||
8d754544 | 155 | if (connector->force) { |
2c4cc91b PH |
156 | if (connector->force == DRM_FORCE_ON || |
157 | connector->force == DRM_FORCE_ON_DIGITAL) | |
8d754544 DV |
158 | connector->status = connector_status_connected; |
159 | else | |
160 | connector->status = connector_status_disconnected; | |
161 | if (connector->funcs->force) | |
162 | connector->funcs->force(connector); | |
163 | } else { | |
164 | connector->status = connector->funcs->detect(connector, true); | |
ed293f77 DV |
165 | } |
166 | ||
167 | /* | |
168 | * Normally either the driver's hpd code or the poll loop should | |
169 | * pick up any changes and fire the hotplug event. But if | |
170 | * userspace sneaks in a probe, we might miss a change. Hence | |
171 | * check here, and if anything changed start the hotplug code. | |
172 | */ | |
173 | if (old_status != connector->status) { | |
4e15f2a1 | 174 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", |
ed293f77 DV |
175 | connector->base.id, |
176 | connector->name, | |
4e15f2a1 JN |
177 | drm_get_connector_status_name(old_status), |
178 | drm_get_connector_status_name(connector->status)); | |
162b6a57 DV |
179 | |
180 | /* | |
ed293f77 DV |
181 | * The hotplug event code might call into the fb |
182 | * helpers, and so expects that we do not hold any | |
183 | * locks. Fire up the poll struct instead, it will | |
184 | * disable itself again. | |
162b6a57 | 185 | */ |
ed293f77 DV |
186 | dev->mode_config.delayed_event = true; |
187 | if (dev->mode_config.poll_enabled) | |
188 | schedule_delayed_work(&dev->mode_config.output_poll_work, | |
189 | 0); | |
8d754544 DV |
190 | } |
191 | ||
192 | /* Re-enable polling in case the global poll config changed. */ | |
193 | if (drm_kms_helper_poll != dev->mode_config.poll_running) | |
4ad640e9 | 194 | drm_kms_helper_poll_enable_locked(dev); |
8d754544 DV |
195 | |
196 | dev->mode_config.poll_running = drm_kms_helper_poll; | |
197 | ||
198 | if (connector->status == connector_status_disconnected) { | |
199 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n", | |
25933820 | 200 | connector->base.id, connector->name); |
8d754544 DV |
201 | drm_mode_connector_update_edid_property(connector, NULL); |
202 | verbose_prune = false; | |
203 | goto prune; | |
204 | } | |
205 | ||
206 | #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE | |
207 | count = drm_load_edid_firmware(connector); | |
208 | if (count == 0) | |
209 | #endif | |
4cf2b281 TW |
210 | { |
211 | if (connector->override_edid) { | |
212 | struct edid *edid = (struct edid *) connector->edid_blob_ptr->data; | |
213 | ||
214 | count = drm_add_edid_modes(connector, edid); | |
ad692b46 | 215 | drm_edid_to_eld(connector, edid); |
4cf2b281 TW |
216 | } else |
217 | count = (*connector_funcs->get_modes)(connector); | |
218 | } | |
8d754544 DV |
219 | |
220 | if (count == 0 && connector->status == connector_status_connected) | |
221 | count = drm_add_modes_noedid(connector, 1024, 768); | |
eaf99c74 | 222 | count += drm_helper_probe_add_cmdline_mode(connector); |
8d754544 DV |
223 | if (count == 0) |
224 | goto prune; | |
225 | ||
b87577b7 | 226 | drm_mode_connector_list_update(connector, merge_type_bits); |
8d754544 | 227 | |
8d754544 DV |
228 | if (connector->interlace_allowed) |
229 | mode_flags |= DRM_MODE_FLAG_INTERLACE; | |
230 | if (connector->doublescan_allowed) | |
231 | mode_flags |= DRM_MODE_FLAG_DBLSCAN; | |
232 | if (connector->stereo_allowed) | |
233 | mode_flags |= DRM_MODE_FLAG_3D_MASK; | |
8d754544 DV |
234 | |
235 | list_for_each_entry(mode, &connector->modes, head) { | |
abc0b144 VS |
236 | mode->status = drm_mode_validate_basic(mode); |
237 | ||
238 | if (mode->status == MODE_OK) | |
239 | mode->status = drm_mode_validate_size(mode, maxX, maxY); | |
05acaec3 VS |
240 | |
241 | if (mode->status == MODE_OK) | |
242 | mode->status = drm_mode_validate_flag(mode, mode_flags); | |
243 | ||
f9b0e251 | 244 | if (mode->status == MODE_OK && connector_funcs->mode_valid) |
8d754544 DV |
245 | mode->status = connector_funcs->mode_valid(connector, |
246 | mode); | |
247 | } | |
248 | ||
249 | prune: | |
250 | drm_mode_prune_invalid(dev, &connector->modes, verbose_prune); | |
251 | ||
252 | if (list_empty(&connector->modes)) | |
253 | return 0; | |
254 | ||
255 | list_for_each_entry(mode, &connector->modes, head) | |
256 | mode->vrefresh = drm_mode_vrefresh(mode); | |
257 | ||
258 | drm_mode_sort(&connector->modes); | |
259 | ||
260 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id, | |
25933820 | 261 | connector->name); |
8d754544 DV |
262 | list_for_each_entry(mode, &connector->modes, head) { |
263 | drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V); | |
264 | drm_mode_debug_printmodeline(mode); | |
265 | } | |
266 | ||
267 | return count; | |
268 | } | |
b87577b7 DA |
269 | |
270 | /** | |
271 | * drm_helper_probe_single_connector_modes - get complete set of display modes | |
272 | * @connector: connector to probe | |
273 | * @maxX: max width for modes | |
274 | * @maxY: max height for modes | |
275 | * | |
2be94971 DV |
276 | * Based on the helper callbacks implemented by @connector in struct |
277 | * &drm_connector_helper_funcs try to detect all valid modes. Modes will first | |
278 | * be added to the connector's probed_modes list, then culled (based on validity | |
279 | * and the @maxX, @maxY parameters) and put into the normal modes list. | |
b87577b7 | 280 | * |
2be94971 DV |
281 | * Intended to be used as a generic implementation of the ->fill_modes() |
282 | * @connector vfunc for drivers that use the CRTC helpers for output mode | |
b87577b7 DA |
283 | * filtering and detection. |
284 | * | |
2be94971 DV |
285 | * If the helper operation returns no mode, and if the connector status is |
286 | * connector_status_connected, standard VESA DMT modes up to 1024x768 are | |
287 | * automatically added to the modes list by a call to | |
288 | * drm_add_modes_noedid(). | |
289 | * | |
290 | * The function then filters out modes larger than @maxX and maxY if specified. | |
291 | * It finally calls the optional connector ->mode_valid() helper operation for each | |
292 | * mode in the probed list to check whether the mode is valid for the connector. | |
293 | * | |
294 | * Compared to drm_helper_probe_single_connector_modes_nomerge() this function | |
295 | * merged the mode bits for the preferred mode, as a hack to work around some | |
296 | * quirky issues on funky hardware. | |
297 | * | |
b87577b7 DA |
298 | * Returns: |
299 | * The number of modes found on @connector. | |
300 | */ | |
301 | int drm_helper_probe_single_connector_modes(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, true); | |
305 | } | |
8d754544 DV |
306 | EXPORT_SYMBOL(drm_helper_probe_single_connector_modes); |
307 | ||
b87577b7 DA |
308 | /** |
309 | * drm_helper_probe_single_connector_modes_nomerge - get complete set of display modes | |
310 | * @connector: connector to probe | |
311 | * @maxX: max width for modes | |
312 | * @maxY: max height for modes | |
313 | * | |
2be94971 | 314 | * This operates like drm_hehlper_probe_single_connector_modes() except it |
b87577b7 | 315 | * replaces the mode bits instead of merging them for preferred modes. |
2be94971 DV |
316 | * |
317 | * Returns: | |
318 | * The number of modes found on @connector. | |
b87577b7 DA |
319 | */ |
320 | int drm_helper_probe_single_connector_modes_nomerge(struct drm_connector *connector, | |
321 | uint32_t maxX, uint32_t maxY) | |
322 | { | |
323 | return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, false); | |
324 | } | |
325 | EXPORT_SYMBOL(drm_helper_probe_single_connector_modes_nomerge); | |
326 | ||
8d754544 DV |
327 | /** |
328 | * drm_kms_helper_hotplug_event - fire off KMS hotplug events | |
329 | * @dev: drm_device whose connector state changed | |
330 | * | |
331 | * This function fires off the uevent for userspace and also calls the | |
332 | * output_poll_changed function, which is most commonly used to inform the fbdev | |
333 | * emulation code and allow it to update the fbcon output configuration. | |
334 | * | |
335 | * Drivers should call this from their hotplug handling code when a change is | |
336 | * detected. Note that this function does not do any output detection of its | |
337 | * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the | |
338 | * driver already. | |
339 | * | |
340 | * This function must be called from process context with no mode | |
341 | * setting locks held. | |
342 | */ | |
343 | void drm_kms_helper_hotplug_event(struct drm_device *dev) | |
344 | { | |
345 | /* send a uevent + call fbdev */ | |
346 | drm_sysfs_hotplug_event(dev); | |
347 | if (dev->mode_config.funcs->output_poll_changed) | |
348 | dev->mode_config.funcs->output_poll_changed(dev); | |
349 | } | |
350 | EXPORT_SYMBOL(drm_kms_helper_hotplug_event); | |
351 | ||
8d754544 DV |
352 | static void output_poll_execute(struct work_struct *work) |
353 | { | |
354 | struct delayed_work *delayed_work = to_delayed_work(work); | |
355 | struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work); | |
356 | struct drm_connector *connector; | |
357 | enum drm_connector_status old_status; | |
162b6a57 DV |
358 | bool repoll = false, changed; |
359 | ||
360 | /* Pick up any changes detected by the probe functions. */ | |
361 | changed = dev->mode_config.delayed_event; | |
362 | dev->mode_config.delayed_event = false; | |
8d754544 DV |
363 | |
364 | if (!drm_kms_helper_poll) | |
162b6a57 | 365 | goto out; |
8d754544 DV |
366 | |
367 | mutex_lock(&dev->mode_config.mutex); | |
6295d607 | 368 | drm_for_each_connector(connector, dev) { |
8d754544 DV |
369 | |
370 | /* Ignore forced connectors. */ | |
371 | if (connector->force) | |
372 | continue; | |
373 | ||
374 | /* Ignore HPD capable connectors and connectors where we don't | |
375 | * want any hotplug detection at all for polling. */ | |
376 | if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD) | |
377 | continue; | |
378 | ||
8d754544 DV |
379 | old_status = connector->status; |
380 | /* if we are connected and don't want to poll for disconnect | |
381 | skip it */ | |
382 | if (old_status == connector_status_connected && | |
383 | !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT)) | |
384 | continue; | |
385 | ||
a3c6d686 JH |
386 | repoll = true; |
387 | ||
8d754544 DV |
388 | connector->status = connector->funcs->detect(connector, false); |
389 | if (old_status != connector->status) { | |
390 | const char *old, *new; | |
391 | ||
b7703726 DV |
392 | /* |
393 | * The poll work sets force=false when calling detect so | |
394 | * that drivers can avoid to do disruptive tests (e.g. | |
395 | * when load detect cycles could cause flickering on | |
396 | * other, running displays). This bears the risk that we | |
397 | * flip-flop between unknown here in the poll work and | |
398 | * the real state when userspace forces a full detect | |
399 | * call after receiving a hotplug event due to this | |
400 | * change. | |
401 | * | |
402 | * Hence clamp an unknown detect status to the old | |
403 | * value. | |
404 | */ | |
405 | if (connector->status == connector_status_unknown) { | |
406 | connector->status = old_status; | |
407 | continue; | |
408 | } | |
409 | ||
8d754544 DV |
410 | old = drm_get_connector_status_name(old_status); |
411 | new = drm_get_connector_status_name(connector->status); | |
412 | ||
413 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] " | |
414 | "status updated from %s to %s\n", | |
415 | connector->base.id, | |
25933820 | 416 | connector->name, |
8d754544 DV |
417 | old, new); |
418 | ||
419 | changed = true; | |
420 | } | |
421 | } | |
422 | ||
423 | mutex_unlock(&dev->mode_config.mutex); | |
424 | ||
162b6a57 | 425 | out: |
8d754544 DV |
426 | if (changed) |
427 | drm_kms_helper_hotplug_event(dev); | |
428 | ||
429 | if (repoll) | |
430 | schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD); | |
431 | } | |
432 | ||
433 | /** | |
434 | * drm_kms_helper_poll_disable - disable output polling | |
435 | * @dev: drm_device | |
436 | * | |
437 | * This function disables the output polling work. | |
438 | * | |
439 | * Drivers can call this helper from their device suspend implementation. It is | |
440 | * not an error to call this even when output polling isn't enabled or arlready | |
441 | * disabled. | |
442 | */ | |
443 | void drm_kms_helper_poll_disable(struct drm_device *dev) | |
444 | { | |
445 | if (!dev->mode_config.poll_enabled) | |
446 | return; | |
447 | cancel_delayed_work_sync(&dev->mode_config.output_poll_work); | |
448 | } | |
449 | EXPORT_SYMBOL(drm_kms_helper_poll_disable); | |
450 | ||
451 | /** | |
452 | * drm_kms_helper_poll_enable - re-enable output polling. | |
453 | * @dev: drm_device | |
454 | * | |
455 | * This function re-enables the output polling work. | |
456 | * | |
457 | * Drivers can call this helper from their device resume implementation. It is | |
458 | * an error to call this when the output polling support has not yet been set | |
459 | * up. | |
460 | */ | |
461 | void drm_kms_helper_poll_enable(struct drm_device *dev) | |
462 | { | |
8c4ccc4a | 463 | mutex_lock(&dev->mode_config.mutex); |
4ad640e9 | 464 | drm_kms_helper_poll_enable_locked(dev); |
8c4ccc4a | 465 | mutex_unlock(&dev->mode_config.mutex); |
8d754544 DV |
466 | } |
467 | EXPORT_SYMBOL(drm_kms_helper_poll_enable); | |
468 | ||
469 | /** | |
470 | * drm_kms_helper_poll_init - initialize and enable output polling | |
471 | * @dev: drm_device | |
472 | * | |
473 | * This function intializes and then also enables output polling support for | |
474 | * @dev. Drivers which do not have reliable hotplug support in hardware can use | |
475 | * this helper infrastructure to regularly poll such connectors for changes in | |
476 | * their connection state. | |
477 | * | |
478 | * Drivers can control which connectors are polled by setting the | |
479 | * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On | |
480 | * connectors where probing live outputs can result in visual distortion drivers | |
481 | * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this. | |
482 | * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are | |
483 | * completely ignored by the polling logic. | |
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 | void drm_kms_helper_poll_init(struct drm_device *dev) | |
489 | { | |
490 | INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute); | |
491 | dev->mode_config.poll_enabled = true; | |
492 | ||
493 | drm_kms_helper_poll_enable(dev); | |
494 | } | |
495 | EXPORT_SYMBOL(drm_kms_helper_poll_init); | |
496 | ||
497 | /** | |
498 | * drm_kms_helper_poll_fini - disable output polling and clean it up | |
499 | * @dev: drm_device | |
500 | */ | |
501 | void drm_kms_helper_poll_fini(struct drm_device *dev) | |
502 | { | |
503 | drm_kms_helper_poll_disable(dev); | |
504 | } | |
505 | EXPORT_SYMBOL(drm_kms_helper_poll_fini); | |
506 | ||
507 | /** | |
508 | * drm_helper_hpd_irq_event - hotplug processing | |
509 | * @dev: drm_device | |
510 | * | |
511 | * Drivers can use this helper function to run a detect cycle on all connectors | |
512 | * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All | |
513 | * other connectors are ignored, which is useful to avoid reprobing fixed | |
514 | * panels. | |
515 | * | |
516 | * This helper function is useful for drivers which can't or don't track hotplug | |
517 | * interrupts for each connector. | |
518 | * | |
519 | * Drivers which support hotplug interrupts for each connector individually and | |
520 | * which have a more fine-grained detect logic should bypass this code and | |
521 | * directly call drm_kms_helper_hotplug_event() in case the connector state | |
522 | * changed. | |
523 | * | |
524 | * This function must be called from process context with no mode | |
525 | * setting locks held. | |
526 | * | |
527 | * Note that a connector can be both polled and probed from the hotplug handler, | |
528 | * in case the hotplug interrupt is known to be unreliable. | |
529 | */ | |
530 | bool drm_helper_hpd_irq_event(struct drm_device *dev) | |
531 | { | |
532 | struct drm_connector *connector; | |
533 | enum drm_connector_status old_status; | |
534 | bool changed = false; | |
535 | ||
536 | if (!dev->mode_config.poll_enabled) | |
537 | return false; | |
538 | ||
539 | mutex_lock(&dev->mode_config.mutex); | |
6295d607 | 540 | drm_for_each_connector(connector, dev) { |
8d754544 DV |
541 | |
542 | /* Only handle HPD capable connectors. */ | |
543 | if (!(connector->polled & DRM_CONNECTOR_POLL_HPD)) | |
544 | continue; | |
545 | ||
546 | old_status = connector->status; | |
547 | ||
548 | connector->status = connector->funcs->detect(connector, false); | |
549 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", | |
550 | connector->base.id, | |
25933820 | 551 | connector->name, |
8d754544 DV |
552 | drm_get_connector_status_name(old_status), |
553 | drm_get_connector_status_name(connector->status)); | |
554 | if (old_status != connector->status) | |
555 | changed = true; | |
556 | } | |
557 | ||
558 | mutex_unlock(&dev->mode_config.mutex); | |
559 | ||
560 | if (changed) | |
561 | drm_kms_helper_hotplug_event(dev); | |
562 | ||
563 | return changed; | |
564 | } | |
565 | EXPORT_SYMBOL(drm_helper_hpd_irq_event); |