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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 | |
6806cdf9 | 46 | * implementation of the core &drm_connector_funcs.fill_modes interface with |
1bbfe9d1 | 47 | * drm_helper_probe_single_connector_modes(). |
8d754544 DV |
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 | |
ea0dd85a | 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 | { | |
5f0c3f99 | 85 | struct drm_cmdline_mode *cmdline_mode; |
eaf99c74 CW |
86 | struct drm_display_mode *mode; |
87 | ||
5f0c3f99 CW |
88 | cmdline_mode = &connector->cmdline_mode; |
89 | if (!cmdline_mode->specified) | |
eaf99c74 CW |
90 | return 0; |
91 | ||
5f0c3f99 CW |
92 | /* Only add a GTF mode if we find no matching probed modes */ |
93 | list_for_each_entry(mode, &connector->probed_modes, head) { | |
94 | if (mode->hdisplay != cmdline_mode->xres || | |
95 | mode->vdisplay != cmdline_mode->yres) | |
96 | continue; | |
97 | ||
98 | if (cmdline_mode->refresh_specified) { | |
99 | /* The probed mode's vrefresh is set until later */ | |
100 | if (drm_mode_vrefresh(mode) != cmdline_mode->refresh) | |
101 | continue; | |
102 | } | |
103 | ||
104 | return 0; | |
105 | } | |
106 | ||
eaf99c74 | 107 | mode = drm_mode_create_from_cmdline_mode(connector->dev, |
5f0c3f99 | 108 | cmdline_mode); |
eaf99c74 CW |
109 | if (mode == NULL) |
110 | return 0; | |
111 | ||
112 | drm_mode_probed_add(connector, mode); | |
113 | return 1; | |
114 | } | |
115 | ||
8c4ccc4a | 116 | #define DRM_OUTPUT_POLL_PERIOD (10*HZ) |
4ad640e9 | 117 | /** |
c4d79c22 | 118 | * drm_kms_helper_poll_enable - re-enable output polling. |
4ad640e9 EE |
119 | * @dev: drm_device |
120 | * | |
c4d79c22 DA |
121 | * This function re-enables the output polling work, after it has been |
122 | * temporarily disabled using drm_kms_helper_poll_disable(), for example over | |
123 | * suspend/resume. | |
4ad640e9 | 124 | * |
c4d79c22 DA |
125 | * Drivers can call this helper from their device resume implementation. It is |
126 | * an error to call this when the output polling support has not yet been set | |
127 | * up. | |
128 | * | |
129 | * Note that calls to enable and disable polling must be strictly ordered, which | |
130 | * is automatically the case when they're only call from suspend/resume | |
131 | * callbacks. | |
4ad640e9 | 132 | */ |
c4d79c22 | 133 | void drm_kms_helper_poll_enable(struct drm_device *dev) |
8c4ccc4a DV |
134 | { |
135 | bool poll = false; | |
136 | struct drm_connector *connector; | |
c36a3254 | 137 | struct drm_connector_list_iter conn_iter; |
339fd362 | 138 | unsigned long delay = DRM_OUTPUT_POLL_PERIOD; |
8c4ccc4a | 139 | |
8c4ccc4a DV |
140 | if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll) |
141 | return; | |
142 | ||
b982dab1 | 143 | drm_connector_list_iter_begin(dev, &conn_iter); |
c36a3254 | 144 | drm_for_each_connector_iter(connector, &conn_iter) { |
8c4ccc4a DV |
145 | if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | |
146 | DRM_CONNECTOR_POLL_DISCONNECT)) | |
147 | poll = true; | |
148 | } | |
b982dab1 | 149 | drm_connector_list_iter_end(&conn_iter); |
8c4ccc4a | 150 | |
339fd362 | 151 | if (dev->mode_config.delayed_event) { |
68f458ee PU |
152 | /* |
153 | * FIXME: | |
154 | * | |
155 | * Use short (1s) delay to handle the initial delayed event. | |
156 | * This delay should not be needed, but Optimus/nouveau will | |
157 | * fail in a mysterious way if the delayed event is handled as | |
158 | * soon as possible like it is done in | |
159 | * drm_helper_probe_single_connector_modes() in case the poll | |
160 | * was enabled before. | |
161 | */ | |
339fd362 | 162 | poll = true; |
68f458ee | 163 | delay = HZ; |
339fd362 PU |
164 | } |
165 | ||
8c4ccc4a | 166 | if (poll) |
339fd362 | 167 | schedule_delayed_work(&dev->mode_config.output_poll_work, delay); |
8c4ccc4a | 168 | } |
c4d79c22 | 169 | EXPORT_SYMBOL(drm_kms_helper_poll_enable); |
4ad640e9 | 170 | |
949f0886 | 171 | static enum drm_connector_status |
6c5ed5ae | 172 | drm_helper_probe_detect_ctx(struct drm_connector *connector, bool force) |
949f0886 | 173 | { |
6c5ed5ae ML |
174 | const struct drm_connector_helper_funcs *funcs = connector->helper_private; |
175 | struct drm_modeset_acquire_ctx ctx; | |
176 | int ret; | |
177 | ||
178 | drm_modeset_acquire_init(&ctx, 0); | |
179 | ||
180 | retry: | |
181 | ret = drm_modeset_lock(&connector->dev->mode_config.connection_mutex, &ctx); | |
182 | if (!ret) { | |
183 | if (funcs->detect_ctx) | |
184 | ret = funcs->detect_ctx(connector, &ctx, force); | |
185 | else if (connector->funcs->detect) | |
186 | ret = connector->funcs->detect(connector, force); | |
187 | else | |
188 | ret = connector_status_connected; | |
189 | } | |
190 | ||
191 | if (ret == -EDEADLK) { | |
192 | drm_modeset_backoff(&ctx); | |
193 | goto retry; | |
194 | } | |
195 | ||
196 | if (WARN_ON(ret < 0)) | |
197 | ret = connector_status_unknown; | |
198 | ||
199 | drm_modeset_drop_locks(&ctx); | |
200 | drm_modeset_acquire_fini(&ctx); | |
201 | ||
202 | return ret; | |
203 | } | |
204 | ||
205 | /** | |
206 | * drm_helper_probe_detect - probe connector status | |
207 | * @connector: connector to probe | |
208 | * @ctx: acquire_ctx, or NULL to let this function handle locking. | |
209 | * @force: Whether destructive probe operations should be performed. | |
210 | * | |
211 | * This function calls the detect callbacks of the connector. | |
212 | * This function returns &drm_connector_status, or | |
213 | * if @ctx is set, it might also return -EDEADLK. | |
214 | */ | |
215 | int | |
216 | drm_helper_probe_detect(struct drm_connector *connector, | |
217 | struct drm_modeset_acquire_ctx *ctx, | |
218 | bool force) | |
219 | { | |
220 | const struct drm_connector_helper_funcs *funcs = connector->helper_private; | |
221 | struct drm_device *dev = connector->dev; | |
222 | int ret; | |
223 | ||
224 | if (!ctx) | |
225 | return drm_helper_probe_detect_ctx(connector, force); | |
226 | ||
227 | ret = drm_modeset_lock(&dev->mode_config.connection_mutex, ctx); | |
228 | if (ret) | |
229 | return ret; | |
230 | ||
231 | if (funcs->detect_ctx) | |
232 | return funcs->detect_ctx(connector, ctx, force); | |
233 | else if (connector->funcs->detect) | |
234 | return connector->funcs->detect(connector, force); | |
235 | else | |
236 | return connector_status_connected; | |
949f0886 | 237 | } |
6c5ed5ae | 238 | EXPORT_SYMBOL(drm_helper_probe_detect); |
949f0886 | 239 | |
6af3e656 VS |
240 | /** |
241 | * drm_helper_probe_single_connector_modes - get complete set of display modes | |
242 | * @connector: connector to probe | |
243 | * @maxX: max width for modes | |
244 | * @maxY: max height for modes | |
245 | * | |
246 | * Based on the helper callbacks implemented by @connector in struct | |
247 | * &drm_connector_helper_funcs try to detect all valid modes. Modes will first | |
248 | * be added to the connector's probed_modes list, then culled (based on validity | |
249 | * and the @maxX, @maxY parameters) and put into the normal modes list. | |
250 | * | |
6806cdf9 DV |
251 | * Intended to be used as a generic implementation of the |
252 | * &drm_connector_funcs.fill_modes() vfunc for drivers that use the CRTC helpers | |
253 | * for output mode filtering and detection. | |
6af3e656 | 254 | * |
5dec293b VS |
255 | * The basic procedure is as follows |
256 | * | |
257 | * 1. All modes currently on the connector's modes list are marked as stale | |
258 | * | |
259 | * 2. New modes are added to the connector's probed_modes list with | |
260 | * drm_mode_probed_add(). New modes start their life with status as OK. | |
261 | * Modes are added from a single source using the following priority order. | |
262 | * | |
263 | * - debugfs 'override_edid' (used for testing only) | |
264 | * - firmware EDID (drm_load_edid_firmware()) | |
6806cdf9 | 265 | * - &drm_connector_helper_funcs.get_modes vfunc |
5dec293b VS |
266 | * - if the connector status is connector_status_connected, standard |
267 | * VESA DMT modes up to 1024x768 are automatically added | |
268 | * (drm_add_modes_noedid()) | |
269 | * | |
270 | * Finally modes specified via the kernel command line (video=...) are | |
271 | * added in addition to what the earlier probes produced | |
272 | * (drm_helper_probe_add_cmdline_mode()). These modes are generated | |
273 | * using the VESA GTF/CVT formulas. | |
274 | * | |
275 | * 3. Modes are moved from the probed_modes list to the modes list. Potential | |
276 | * duplicates are merged together (see drm_mode_connector_list_update()). | |
277 | * After this step the probed_modes list will be empty again. | |
278 | * | |
279 | * 4. Any non-stale mode on the modes list then undergoes validation | |
280 | * | |
281 | * - drm_mode_validate_basic() performs basic sanity checks | |
282 | * - drm_mode_validate_size() filters out modes larger than @maxX and @maxY | |
283 | * (if specified) | |
57366a8d MY |
284 | * - drm_mode_validate_flag() checks the modes against basic connector |
285 | * capabilities (interlace_allowed,doublescan_allowed,stereo_allowed) | |
6806cdf9 DV |
286 | * - the optional &drm_connector_helper_funcs.mode_valid helper can perform |
287 | * driver and/or hardware specific checks | |
5dec293b VS |
288 | * |
289 | * 5. Any mode whose status is not OK is pruned from the connector's modes list, | |
290 | * accompanied by a debug message indicating the reason for the mode's | |
291 | * rejection (see drm_mode_prune_invalid()). | |
6af3e656 VS |
292 | * |
293 | * Returns: | |
294 | * The number of modes found on @connector. | |
295 | */ | |
296 | int drm_helper_probe_single_connector_modes(struct drm_connector *connector, | |
297 | uint32_t maxX, uint32_t maxY) | |
8d754544 DV |
298 | { |
299 | struct drm_device *dev = connector->dev; | |
300 | struct drm_display_mode *mode; | |
be26a66d | 301 | const struct drm_connector_helper_funcs *connector_funcs = |
8d754544 | 302 | connector->helper_private; |
6c5ed5ae | 303 | int count = 0, ret; |
8d754544 DV |
304 | int mode_flags = 0; |
305 | bool verbose_prune = true; | |
162b6a57 | 306 | enum drm_connector_status old_status; |
6c5ed5ae | 307 | struct drm_modeset_acquire_ctx ctx; |
8d754544 DV |
308 | |
309 | WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); | |
310 | ||
6c5ed5ae ML |
311 | drm_modeset_acquire_init(&ctx, 0); |
312 | ||
8d754544 | 313 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, |
25933820 | 314 | connector->name); |
6c5ed5ae ML |
315 | |
316 | retry: | |
317 | ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx); | |
318 | if (ret == -EDEADLK) { | |
319 | drm_modeset_backoff(&ctx); | |
320 | goto retry; | |
321 | } else | |
322 | WARN_ON(ret < 0); | |
323 | ||
5ba89406 | 324 | /* set all old modes to the stale state */ |
8d754544 | 325 | list_for_each_entry(mode, &connector->modes, head) |
5ba89406 | 326 | mode->status = MODE_STALE; |
8d754544 | 327 | |
ed293f77 DV |
328 | old_status = connector->status; |
329 | ||
8d754544 | 330 | if (connector->force) { |
2c4cc91b PH |
331 | if (connector->force == DRM_FORCE_ON || |
332 | connector->force == DRM_FORCE_ON_DIGITAL) | |
8d754544 DV |
333 | connector->status = connector_status_connected; |
334 | else | |
335 | connector->status = connector_status_disconnected; | |
336 | if (connector->funcs->force) | |
337 | connector->funcs->force(connector); | |
338 | } else { | |
6c5ed5ae ML |
339 | ret = drm_helper_probe_detect(connector, &ctx, true); |
340 | ||
341 | if (ret == -EDEADLK) { | |
342 | drm_modeset_backoff(&ctx); | |
343 | goto retry; | |
344 | } else if (WARN(ret < 0, "Invalid return value %i for connector detection\n", ret)) | |
345 | ret = connector_status_unknown; | |
346 | ||
347 | connector->status = ret; | |
ed293f77 DV |
348 | } |
349 | ||
350 | /* | |
351 | * Normally either the driver's hpd code or the poll loop should | |
352 | * pick up any changes and fire the hotplug event. But if | |
353 | * userspace sneaks in a probe, we might miss a change. Hence | |
354 | * check here, and if anything changed start the hotplug code. | |
355 | */ | |
356 | if (old_status != connector->status) { | |
4e15f2a1 | 357 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", |
ed293f77 DV |
358 | connector->base.id, |
359 | connector->name, | |
4e15f2a1 JN |
360 | drm_get_connector_status_name(old_status), |
361 | drm_get_connector_status_name(connector->status)); | |
162b6a57 DV |
362 | |
363 | /* | |
ed293f77 DV |
364 | * The hotplug event code might call into the fb |
365 | * helpers, and so expects that we do not hold any | |
366 | * locks. Fire up the poll struct instead, it will | |
367 | * disable itself again. | |
162b6a57 | 368 | */ |
ed293f77 DV |
369 | dev->mode_config.delayed_event = true; |
370 | if (dev->mode_config.poll_enabled) | |
371 | schedule_delayed_work(&dev->mode_config.output_poll_work, | |
372 | 0); | |
8d754544 DV |
373 | } |
374 | ||
375 | /* Re-enable polling in case the global poll config changed. */ | |
376 | if (drm_kms_helper_poll != dev->mode_config.poll_running) | |
c4d79c22 | 377 | drm_kms_helper_poll_enable(dev); |
8d754544 DV |
378 | |
379 | dev->mode_config.poll_running = drm_kms_helper_poll; | |
380 | ||
381 | if (connector->status == connector_status_disconnected) { | |
382 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n", | |
25933820 | 383 | connector->base.id, connector->name); |
8d754544 DV |
384 | drm_mode_connector_update_edid_property(connector, NULL); |
385 | verbose_prune = false; | |
386 | goto prune; | |
387 | } | |
388 | ||
0e8578c9 VS |
389 | if (connector->override_edid) { |
390 | struct edid *edid = (struct edid *) connector->edid_blob_ptr->data; | |
391 | ||
392 | count = drm_add_edid_modes(connector, edid); | |
393 | drm_edid_to_eld(connector, edid); | |
394 | } else { | |
07c2b84b JN |
395 | struct edid *edid = drm_load_edid_firmware(connector); |
396 | if (!IS_ERR_OR_NULL(edid)) { | |
397 | drm_mode_connector_update_edid_property(connector, edid); | |
398 | count = drm_add_edid_modes(connector, edid); | |
399 | drm_edid_to_eld(connector, edid); | |
400 | kfree(edid); | |
401 | } | |
0e8578c9 | 402 | if (count == 0) |
4cf2b281 TW |
403 | count = (*connector_funcs->get_modes)(connector); |
404 | } | |
8d754544 DV |
405 | |
406 | if (count == 0 && connector->status == connector_status_connected) | |
407 | count = drm_add_modes_noedid(connector, 1024, 768); | |
eaf99c74 | 408 | count += drm_helper_probe_add_cmdline_mode(connector); |
8d754544 DV |
409 | if (count == 0) |
410 | goto prune; | |
411 | ||
6af3e656 | 412 | drm_mode_connector_list_update(connector); |
8d754544 | 413 | |
8d754544 DV |
414 | if (connector->interlace_allowed) |
415 | mode_flags |= DRM_MODE_FLAG_INTERLACE; | |
416 | if (connector->doublescan_allowed) | |
417 | mode_flags |= DRM_MODE_FLAG_DBLSCAN; | |
418 | if (connector->stereo_allowed) | |
419 | mode_flags |= DRM_MODE_FLAG_3D_MASK; | |
8d754544 DV |
420 | |
421 | list_for_each_entry(mode, &connector->modes, head) { | |
be8719a6 VS |
422 | if (mode->status == MODE_OK) |
423 | mode->status = drm_mode_validate_basic(mode); | |
abc0b144 VS |
424 | |
425 | if (mode->status == MODE_OK) | |
426 | mode->status = drm_mode_validate_size(mode, maxX, maxY); | |
05acaec3 VS |
427 | |
428 | if (mode->status == MODE_OK) | |
429 | mode->status = drm_mode_validate_flag(mode, mode_flags); | |
430 | ||
f9b0e251 | 431 | if (mode->status == MODE_OK && connector_funcs->mode_valid) |
8d754544 DV |
432 | mode->status = connector_funcs->mode_valid(connector, |
433 | mode); | |
434 | } | |
435 | ||
436 | prune: | |
437 | drm_mode_prune_invalid(dev, &connector->modes, verbose_prune); | |
438 | ||
6c5ed5ae ML |
439 | drm_modeset_drop_locks(&ctx); |
440 | drm_modeset_acquire_fini(&ctx); | |
441 | ||
8d754544 DV |
442 | if (list_empty(&connector->modes)) |
443 | return 0; | |
444 | ||
445 | list_for_each_entry(mode, &connector->modes, head) | |
446 | mode->vrefresh = drm_mode_vrefresh(mode); | |
447 | ||
448 | drm_mode_sort(&connector->modes); | |
449 | ||
450 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id, | |
25933820 | 451 | connector->name); |
8d754544 DV |
452 | list_for_each_entry(mode, &connector->modes, head) { |
453 | drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V); | |
454 | drm_mode_debug_printmodeline(mode); | |
455 | } | |
456 | ||
457 | return count; | |
458 | } | |
459 | EXPORT_SYMBOL(drm_helper_probe_single_connector_modes); | |
460 | ||
461 | /** | |
462 | * drm_kms_helper_hotplug_event - fire off KMS hotplug events | |
463 | * @dev: drm_device whose connector state changed | |
464 | * | |
465 | * This function fires off the uevent for userspace and also calls the | |
466 | * output_poll_changed function, which is most commonly used to inform the fbdev | |
467 | * emulation code and allow it to update the fbcon output configuration. | |
468 | * | |
469 | * Drivers should call this from their hotplug handling code when a change is | |
470 | * detected. Note that this function does not do any output detection of its | |
471 | * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the | |
472 | * driver already. | |
473 | * | |
474 | * This function must be called from process context with no mode | |
475 | * setting locks held. | |
476 | */ | |
477 | void drm_kms_helper_hotplug_event(struct drm_device *dev) | |
478 | { | |
479 | /* send a uevent + call fbdev */ | |
480 | drm_sysfs_hotplug_event(dev); | |
481 | if (dev->mode_config.funcs->output_poll_changed) | |
482 | dev->mode_config.funcs->output_poll_changed(dev); | |
483 | } | |
484 | EXPORT_SYMBOL(drm_kms_helper_hotplug_event); | |
485 | ||
8d754544 DV |
486 | static void output_poll_execute(struct work_struct *work) |
487 | { | |
488 | struct delayed_work *delayed_work = to_delayed_work(work); | |
489 | struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work); | |
490 | struct drm_connector *connector; | |
c36a3254 | 491 | struct drm_connector_list_iter conn_iter; |
8d754544 | 492 | enum drm_connector_status old_status; |
162b6a57 DV |
493 | bool repoll = false, changed; |
494 | ||
495 | /* Pick up any changes detected by the probe functions. */ | |
496 | changed = dev->mode_config.delayed_event; | |
497 | dev->mode_config.delayed_event = false; | |
8d754544 DV |
498 | |
499 | if (!drm_kms_helper_poll) | |
162b6a57 | 500 | goto out; |
8d754544 | 501 | |
1fe7841d CW |
502 | if (!mutex_trylock(&dev->mode_config.mutex)) { |
503 | repoll = true; | |
504 | goto out; | |
505 | } | |
506 | ||
b982dab1 | 507 | drm_connector_list_iter_begin(dev, &conn_iter); |
c36a3254 | 508 | drm_for_each_connector_iter(connector, &conn_iter) { |
8d754544 DV |
509 | /* Ignore forced connectors. */ |
510 | if (connector->force) | |
511 | continue; | |
512 | ||
513 | /* Ignore HPD capable connectors and connectors where we don't | |
514 | * want any hotplug detection at all for polling. */ | |
515 | if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD) | |
516 | continue; | |
517 | ||
8d754544 DV |
518 | old_status = connector->status; |
519 | /* if we are connected and don't want to poll for disconnect | |
520 | skip it */ | |
521 | if (old_status == connector_status_connected && | |
522 | !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT)) | |
523 | continue; | |
524 | ||
a3c6d686 JH |
525 | repoll = true; |
526 | ||
6c5ed5ae | 527 | connector->status = drm_helper_probe_detect(connector, NULL, false); |
8d754544 DV |
528 | if (old_status != connector->status) { |
529 | const char *old, *new; | |
530 | ||
b7703726 DV |
531 | /* |
532 | * The poll work sets force=false when calling detect so | |
533 | * that drivers can avoid to do disruptive tests (e.g. | |
534 | * when load detect cycles could cause flickering on | |
535 | * other, running displays). This bears the risk that we | |
536 | * flip-flop between unknown here in the poll work and | |
537 | * the real state when userspace forces a full detect | |
538 | * call after receiving a hotplug event due to this | |
539 | * change. | |
540 | * | |
541 | * Hence clamp an unknown detect status to the old | |
542 | * value. | |
543 | */ | |
544 | if (connector->status == connector_status_unknown) { | |
545 | connector->status = old_status; | |
546 | continue; | |
547 | } | |
548 | ||
8d754544 DV |
549 | old = drm_get_connector_status_name(old_status); |
550 | new = drm_get_connector_status_name(connector->status); | |
551 | ||
552 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] " | |
553 | "status updated from %s to %s\n", | |
554 | connector->base.id, | |
25933820 | 555 | connector->name, |
8d754544 DV |
556 | old, new); |
557 | ||
558 | changed = true; | |
559 | } | |
560 | } | |
b982dab1 | 561 | drm_connector_list_iter_end(&conn_iter); |
8d754544 DV |
562 | |
563 | mutex_unlock(&dev->mode_config.mutex); | |
564 | ||
162b6a57 | 565 | out: |
8d754544 DV |
566 | if (changed) |
567 | drm_kms_helper_hotplug_event(dev); | |
568 | ||
569 | if (repoll) | |
570 | schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD); | |
571 | } | |
572 | ||
573 | /** | |
574 | * drm_kms_helper_poll_disable - disable output polling | |
575 | * @dev: drm_device | |
576 | * | |
577 | * This function disables the output polling work. | |
578 | * | |
579 | * Drivers can call this helper from their device suspend implementation. It is | |
c4d79c22 DA |
580 | * not an error to call this even when output polling isn't enabled or already |
581 | * disabled. Polling is re-enabled by calling drm_kms_helper_poll_enable(). | |
582 | * | |
583 | * Note that calls to enable and disable polling must be strictly ordered, which | |
584 | * is automatically the case when they're only call from suspend/resume | |
585 | * callbacks. | |
8d754544 DV |
586 | */ |
587 | void drm_kms_helper_poll_disable(struct drm_device *dev) | |
588 | { | |
589 | if (!dev->mode_config.poll_enabled) | |
590 | return; | |
591 | cancel_delayed_work_sync(&dev->mode_config.output_poll_work); | |
592 | } | |
593 | EXPORT_SYMBOL(drm_kms_helper_poll_disable); | |
594 | ||
8d754544 DV |
595 | /** |
596 | * drm_kms_helper_poll_init - initialize and enable output polling | |
597 | * @dev: drm_device | |
598 | * | |
599 | * This function intializes and then also enables output polling support for | |
600 | * @dev. Drivers which do not have reliable hotplug support in hardware can use | |
601 | * this helper infrastructure to regularly poll such connectors for changes in | |
602 | * their connection state. | |
603 | * | |
604 | * Drivers can control which connectors are polled by setting the | |
605 | * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On | |
606 | * connectors where probing live outputs can result in visual distortion drivers | |
607 | * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this. | |
608 | * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are | |
609 | * completely ignored by the polling logic. | |
610 | * | |
611 | * Note that a connector can be both polled and probed from the hotplug handler, | |
612 | * in case the hotplug interrupt is known to be unreliable. | |
613 | */ | |
614 | void drm_kms_helper_poll_init(struct drm_device *dev) | |
615 | { | |
616 | INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute); | |
617 | dev->mode_config.poll_enabled = true; | |
618 | ||
619 | drm_kms_helper_poll_enable(dev); | |
620 | } | |
621 | EXPORT_SYMBOL(drm_kms_helper_poll_init); | |
622 | ||
623 | /** | |
624 | * drm_kms_helper_poll_fini - disable output polling and clean it up | |
625 | * @dev: drm_device | |
626 | */ | |
627 | void drm_kms_helper_poll_fini(struct drm_device *dev) | |
628 | { | |
629 | drm_kms_helper_poll_disable(dev); | |
630 | } | |
631 | EXPORT_SYMBOL(drm_kms_helper_poll_fini); | |
632 | ||
633 | /** | |
634 | * drm_helper_hpd_irq_event - hotplug processing | |
635 | * @dev: drm_device | |
636 | * | |
637 | * Drivers can use this helper function to run a detect cycle on all connectors | |
638 | * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All | |
639 | * other connectors are ignored, which is useful to avoid reprobing fixed | |
640 | * panels. | |
641 | * | |
642 | * This helper function is useful for drivers which can't or don't track hotplug | |
643 | * interrupts for each connector. | |
644 | * | |
645 | * Drivers which support hotplug interrupts for each connector individually and | |
646 | * which have a more fine-grained detect logic should bypass this code and | |
647 | * directly call drm_kms_helper_hotplug_event() in case the connector state | |
648 | * changed. | |
649 | * | |
650 | * This function must be called from process context with no mode | |
651 | * setting locks held. | |
652 | * | |
653 | * Note that a connector can be both polled and probed from the hotplug handler, | |
654 | * in case the hotplug interrupt is known to be unreliable. | |
655 | */ | |
656 | bool drm_helper_hpd_irq_event(struct drm_device *dev) | |
657 | { | |
658 | struct drm_connector *connector; | |
c36a3254 | 659 | struct drm_connector_list_iter conn_iter; |
8d754544 DV |
660 | enum drm_connector_status old_status; |
661 | bool changed = false; | |
662 | ||
663 | if (!dev->mode_config.poll_enabled) | |
664 | return false; | |
665 | ||
666 | mutex_lock(&dev->mode_config.mutex); | |
b982dab1 | 667 | drm_connector_list_iter_begin(dev, &conn_iter); |
c36a3254 | 668 | drm_for_each_connector_iter(connector, &conn_iter) { |
8d754544 DV |
669 | /* Only handle HPD capable connectors. */ |
670 | if (!(connector->polled & DRM_CONNECTOR_POLL_HPD)) | |
671 | continue; | |
672 | ||
673 | old_status = connector->status; | |
674 | ||
6c5ed5ae | 675 | connector->status = drm_helper_probe_detect(connector, NULL, false); |
8d754544 DV |
676 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", |
677 | connector->base.id, | |
25933820 | 678 | connector->name, |
8d754544 DV |
679 | drm_get_connector_status_name(old_status), |
680 | drm_get_connector_status_name(connector->status)); | |
681 | if (old_status != connector->status) | |
682 | changed = true; | |
683 | } | |
b982dab1 | 684 | drm_connector_list_iter_end(&conn_iter); |
8d754544 DV |
685 | mutex_unlock(&dev->mode_config.mutex); |
686 | ||
687 | if (changed) | |
688 | drm_kms_helper_hotplug_event(dev); | |
689 | ||
690 | return changed; | |
691 | } | |
692 | EXPORT_SYMBOL(drm_helper_hpd_irq_event); |