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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> | |
da251bf8 JA |
41 | #include <drm/drm_modeset_helper_vtables.h> |
42 | ||
43 | #include "drm_crtc_helper_internal.h" | |
8d754544 DV |
44 | |
45 | /** | |
46 | * DOC: output probing helper overview | |
47 | * | |
48 | * This library provides some helper code for output probing. It provides an | |
6806cdf9 | 49 | * implementation of the core &drm_connector_funcs.fill_modes interface with |
1bbfe9d1 | 50 | * drm_helper_probe_single_connector_modes(). |
8d754544 DV |
51 | * |
52 | * It also provides support for polling connectors with a work item and for | |
53 | * generic hotplug interrupt handling where the driver doesn't or cannot keep | |
54 | * track of a per-connector hpd interrupt. | |
55 | * | |
56 | * This helper library can be used independently of the modeset helper library. | |
57 | * Drivers can also overwrite different parts e.g. use their own hotplug | |
58 | * handling code to avoid probing unrelated outputs. | |
092d01da DV |
59 | * |
60 | * The probe helpers share the function table structures with other display | |
ea0dd85a | 61 | * helper libraries. See &struct drm_connector_helper_funcs for the details. |
8d754544 DV |
62 | */ |
63 | ||
64 | static bool drm_kms_helper_poll = true; | |
65 | module_param_named(poll, drm_kms_helper_poll, bool, 0600); | |
66 | ||
05acaec3 VS |
67 | static enum drm_mode_status |
68 | drm_mode_validate_flag(const struct drm_display_mode *mode, | |
69 | int flags) | |
8d754544 | 70 | { |
05acaec3 VS |
71 | if ((mode->flags & DRM_MODE_FLAG_INTERLACE) && |
72 | !(flags & DRM_MODE_FLAG_INTERLACE)) | |
73 | return MODE_NO_INTERLACE; | |
8d754544 | 74 | |
05acaec3 VS |
75 | if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) && |
76 | !(flags & DRM_MODE_FLAG_DBLSCAN)) | |
77 | return MODE_NO_DBLESCAN; | |
8d754544 | 78 | |
05acaec3 VS |
79 | if ((mode->flags & DRM_MODE_FLAG_3D_MASK) && |
80 | !(flags & DRM_MODE_FLAG_3D_MASK)) | |
81 | return MODE_NO_STEREO; | |
8d754544 | 82 | |
05acaec3 | 83 | return MODE_OK; |
8d754544 DV |
84 | } |
85 | ||
97f973d6 JA |
86 | static enum drm_mode_status |
87 | drm_mode_validate_pipeline(struct drm_display_mode *mode, | |
88 | struct drm_connector *connector) | |
89 | { | |
90 | struct drm_device *dev = connector->dev; | |
91 | uint32_t *ids = connector->encoder_ids; | |
92 | enum drm_mode_status ret = MODE_OK; | |
93 | unsigned int i; | |
94 | ||
95 | /* Step 1: Validate against connector */ | |
96 | ret = drm_connector_mode_valid(connector, mode); | |
97 | if (ret != MODE_OK) | |
98 | return ret; | |
99 | ||
100 | /* Step 2: Validate against encoders and crtcs */ | |
101 | for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) { | |
418da172 | 102 | struct drm_encoder *encoder = drm_encoder_find(dev, NULL, ids[i]); |
97f973d6 JA |
103 | struct drm_crtc *crtc; |
104 | ||
105 | if (!encoder) | |
106 | continue; | |
107 | ||
108 | ret = drm_encoder_mode_valid(encoder, mode); | |
109 | if (ret != MODE_OK) { | |
110 | /* No point in continuing for crtc check as this encoder | |
111 | * will not accept the mode anyway. If all encoders | |
112 | * reject the mode then, at exit, ret will not be | |
113 | * MODE_OK. */ | |
114 | continue; | |
115 | } | |
116 | ||
117 | ret = drm_bridge_mode_valid(encoder->bridge, mode); | |
118 | if (ret != MODE_OK) { | |
119 | /* There is also no point in continuing for crtc check | |
120 | * here. */ | |
121 | continue; | |
122 | } | |
123 | ||
124 | drm_for_each_crtc(crtc, dev) { | |
125 | if (!drm_encoder_crtc_ok(encoder, crtc)) | |
126 | continue; | |
127 | ||
128 | ret = drm_crtc_mode_valid(crtc, mode); | |
129 | if (ret == MODE_OK) { | |
130 | /* If we get to this point there is at least | |
131 | * one combination of encoder+crtc that works | |
132 | * for this mode. Lets return now. */ | |
133 | return ret; | |
134 | } | |
135 | } | |
136 | } | |
137 | ||
138 | return ret; | |
139 | } | |
140 | ||
eaf99c74 CW |
141 | static int drm_helper_probe_add_cmdline_mode(struct drm_connector *connector) |
142 | { | |
5f0c3f99 | 143 | struct drm_cmdline_mode *cmdline_mode; |
eaf99c74 CW |
144 | struct drm_display_mode *mode; |
145 | ||
5f0c3f99 CW |
146 | cmdline_mode = &connector->cmdline_mode; |
147 | if (!cmdline_mode->specified) | |
eaf99c74 CW |
148 | return 0; |
149 | ||
5f0c3f99 CW |
150 | /* Only add a GTF mode if we find no matching probed modes */ |
151 | list_for_each_entry(mode, &connector->probed_modes, head) { | |
152 | if (mode->hdisplay != cmdline_mode->xres || | |
153 | mode->vdisplay != cmdline_mode->yres) | |
154 | continue; | |
155 | ||
156 | if (cmdline_mode->refresh_specified) { | |
157 | /* The probed mode's vrefresh is set until later */ | |
158 | if (drm_mode_vrefresh(mode) != cmdline_mode->refresh) | |
159 | continue; | |
160 | } | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
eaf99c74 | 165 | mode = drm_mode_create_from_cmdline_mode(connector->dev, |
5f0c3f99 | 166 | cmdline_mode); |
eaf99c74 CW |
167 | if (mode == NULL) |
168 | return 0; | |
169 | ||
170 | drm_mode_probed_add(connector, mode); | |
171 | return 1; | |
172 | } | |
173 | ||
da251bf8 JA |
174 | enum drm_mode_status drm_crtc_mode_valid(struct drm_crtc *crtc, |
175 | const struct drm_display_mode *mode) | |
176 | { | |
177 | const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; | |
178 | ||
179 | if (!crtc_funcs || !crtc_funcs->mode_valid) | |
180 | return MODE_OK; | |
181 | ||
182 | return crtc_funcs->mode_valid(crtc, mode); | |
183 | } | |
184 | ||
185 | enum drm_mode_status drm_encoder_mode_valid(struct drm_encoder *encoder, | |
186 | const struct drm_display_mode *mode) | |
187 | { | |
188 | const struct drm_encoder_helper_funcs *encoder_funcs = | |
189 | encoder->helper_private; | |
190 | ||
191 | if (!encoder_funcs || !encoder_funcs->mode_valid) | |
192 | return MODE_OK; | |
193 | ||
194 | return encoder_funcs->mode_valid(encoder, mode); | |
195 | } | |
196 | ||
197 | enum drm_mode_status drm_connector_mode_valid(struct drm_connector *connector, | |
198 | struct drm_display_mode *mode) | |
199 | { | |
200 | const struct drm_connector_helper_funcs *connector_funcs = | |
201 | connector->helper_private; | |
202 | ||
203 | if (!connector_funcs || !connector_funcs->mode_valid) | |
204 | return MODE_OK; | |
205 | ||
206 | return connector_funcs->mode_valid(connector, mode); | |
207 | } | |
208 | ||
8c4ccc4a | 209 | #define DRM_OUTPUT_POLL_PERIOD (10*HZ) |
4ad640e9 | 210 | /** |
c4d79c22 | 211 | * drm_kms_helper_poll_enable - re-enable output polling. |
4ad640e9 EE |
212 | * @dev: drm_device |
213 | * | |
c4d79c22 DA |
214 | * This function re-enables the output polling work, after it has been |
215 | * temporarily disabled using drm_kms_helper_poll_disable(), for example over | |
216 | * suspend/resume. | |
4ad640e9 | 217 | * |
c4d79c22 | 218 | * Drivers can call this helper from their device resume implementation. It is |
b66d0f34 | 219 | * not an error to call this even when output polling isn't enabled. |
c4d79c22 DA |
220 | * |
221 | * Note that calls to enable and disable polling must be strictly ordered, which | |
222 | * is automatically the case when they're only call from suspend/resume | |
223 | * callbacks. | |
4ad640e9 | 224 | */ |
c4d79c22 | 225 | void drm_kms_helper_poll_enable(struct drm_device *dev) |
8c4ccc4a DV |
226 | { |
227 | bool poll = false; | |
228 | struct drm_connector *connector; | |
c36a3254 | 229 | struct drm_connector_list_iter conn_iter; |
339fd362 | 230 | unsigned long delay = DRM_OUTPUT_POLL_PERIOD; |
8c4ccc4a | 231 | |
8c4ccc4a DV |
232 | if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll) |
233 | return; | |
234 | ||
b982dab1 | 235 | drm_connector_list_iter_begin(dev, &conn_iter); |
c36a3254 | 236 | drm_for_each_connector_iter(connector, &conn_iter) { |
8c4ccc4a DV |
237 | if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | |
238 | DRM_CONNECTOR_POLL_DISCONNECT)) | |
239 | poll = true; | |
240 | } | |
b982dab1 | 241 | drm_connector_list_iter_end(&conn_iter); |
8c4ccc4a | 242 | |
339fd362 | 243 | if (dev->mode_config.delayed_event) { |
68f458ee PU |
244 | /* |
245 | * FIXME: | |
246 | * | |
247 | * Use short (1s) delay to handle the initial delayed event. | |
248 | * This delay should not be needed, but Optimus/nouveau will | |
249 | * fail in a mysterious way if the delayed event is handled as | |
250 | * soon as possible like it is done in | |
251 | * drm_helper_probe_single_connector_modes() in case the poll | |
252 | * was enabled before. | |
253 | */ | |
339fd362 | 254 | poll = true; |
68f458ee | 255 | delay = HZ; |
339fd362 PU |
256 | } |
257 | ||
8c4ccc4a | 258 | if (poll) |
339fd362 | 259 | schedule_delayed_work(&dev->mode_config.output_poll_work, delay); |
8c4ccc4a | 260 | } |
c4d79c22 | 261 | EXPORT_SYMBOL(drm_kms_helper_poll_enable); |
4ad640e9 | 262 | |
949f0886 | 263 | static enum drm_connector_status |
6c5ed5ae | 264 | drm_helper_probe_detect_ctx(struct drm_connector *connector, bool force) |
949f0886 | 265 | { |
6c5ed5ae ML |
266 | const struct drm_connector_helper_funcs *funcs = connector->helper_private; |
267 | struct drm_modeset_acquire_ctx ctx; | |
268 | int ret; | |
269 | ||
270 | drm_modeset_acquire_init(&ctx, 0); | |
271 | ||
272 | retry: | |
273 | ret = drm_modeset_lock(&connector->dev->mode_config.connection_mutex, &ctx); | |
274 | if (!ret) { | |
275 | if (funcs->detect_ctx) | |
276 | ret = funcs->detect_ctx(connector, &ctx, force); | |
277 | else if (connector->funcs->detect) | |
278 | ret = connector->funcs->detect(connector, force); | |
279 | else | |
280 | ret = connector_status_connected; | |
281 | } | |
282 | ||
283 | if (ret == -EDEADLK) { | |
284 | drm_modeset_backoff(&ctx); | |
285 | goto retry; | |
286 | } | |
287 | ||
288 | if (WARN_ON(ret < 0)) | |
289 | ret = connector_status_unknown; | |
290 | ||
291 | drm_modeset_drop_locks(&ctx); | |
292 | drm_modeset_acquire_fini(&ctx); | |
293 | ||
294 | return ret; | |
295 | } | |
296 | ||
297 | /** | |
298 | * drm_helper_probe_detect - probe connector status | |
299 | * @connector: connector to probe | |
300 | * @ctx: acquire_ctx, or NULL to let this function handle locking. | |
301 | * @force: Whether destructive probe operations should be performed. | |
302 | * | |
303 | * This function calls the detect callbacks of the connector. | |
304 | * This function returns &drm_connector_status, or | |
305 | * if @ctx is set, it might also return -EDEADLK. | |
306 | */ | |
307 | int | |
308 | drm_helper_probe_detect(struct drm_connector *connector, | |
309 | struct drm_modeset_acquire_ctx *ctx, | |
310 | bool force) | |
311 | { | |
312 | const struct drm_connector_helper_funcs *funcs = connector->helper_private; | |
313 | struct drm_device *dev = connector->dev; | |
314 | int ret; | |
315 | ||
316 | if (!ctx) | |
317 | return drm_helper_probe_detect_ctx(connector, force); | |
318 | ||
319 | ret = drm_modeset_lock(&dev->mode_config.connection_mutex, ctx); | |
320 | if (ret) | |
321 | return ret; | |
322 | ||
323 | if (funcs->detect_ctx) | |
324 | return funcs->detect_ctx(connector, ctx, force); | |
325 | else if (connector->funcs->detect) | |
326 | return connector->funcs->detect(connector, force); | |
327 | else | |
328 | return connector_status_connected; | |
949f0886 | 329 | } |
6c5ed5ae | 330 | EXPORT_SYMBOL(drm_helper_probe_detect); |
949f0886 | 331 | |
6af3e656 VS |
332 | /** |
333 | * drm_helper_probe_single_connector_modes - get complete set of display modes | |
334 | * @connector: connector to probe | |
335 | * @maxX: max width for modes | |
336 | * @maxY: max height for modes | |
337 | * | |
338 | * Based on the helper callbacks implemented by @connector in struct | |
339 | * &drm_connector_helper_funcs try to detect all valid modes. Modes will first | |
340 | * be added to the connector's probed_modes list, then culled (based on validity | |
341 | * and the @maxX, @maxY parameters) and put into the normal modes list. | |
342 | * | |
6806cdf9 DV |
343 | * Intended to be used as a generic implementation of the |
344 | * &drm_connector_funcs.fill_modes() vfunc for drivers that use the CRTC helpers | |
345 | * for output mode filtering and detection. | |
6af3e656 | 346 | * |
5dec293b VS |
347 | * The basic procedure is as follows |
348 | * | |
349 | * 1. All modes currently on the connector's modes list are marked as stale | |
350 | * | |
351 | * 2. New modes are added to the connector's probed_modes list with | |
352 | * drm_mode_probed_add(). New modes start their life with status as OK. | |
353 | * Modes are added from a single source using the following priority order. | |
354 | * | |
6806cdf9 | 355 | * - &drm_connector_helper_funcs.get_modes vfunc |
5dec293b VS |
356 | * - if the connector status is connector_status_connected, standard |
357 | * VESA DMT modes up to 1024x768 are automatically added | |
358 | * (drm_add_modes_noedid()) | |
359 | * | |
360 | * Finally modes specified via the kernel command line (video=...) are | |
361 | * added in addition to what the earlier probes produced | |
362 | * (drm_helper_probe_add_cmdline_mode()). These modes are generated | |
363 | * using the VESA GTF/CVT formulas. | |
364 | * | |
365 | * 3. Modes are moved from the probed_modes list to the modes list. Potential | |
366 | * duplicates are merged together (see drm_mode_connector_list_update()). | |
367 | * After this step the probed_modes list will be empty again. | |
368 | * | |
369 | * 4. Any non-stale mode on the modes list then undergoes validation | |
370 | * | |
371 | * - drm_mode_validate_basic() performs basic sanity checks | |
372 | * - drm_mode_validate_size() filters out modes larger than @maxX and @maxY | |
373 | * (if specified) | |
57366a8d MY |
374 | * - drm_mode_validate_flag() checks the modes against basic connector |
375 | * capabilities (interlace_allowed,doublescan_allowed,stereo_allowed) | |
6806cdf9 | 376 | * - the optional &drm_connector_helper_funcs.mode_valid helper can perform |
97f973d6 JA |
377 | * driver and/or sink specific checks |
378 | * - the optional &drm_crtc_helper_funcs.mode_valid, | |
379 | * &drm_bridge_funcs.mode_valid and &drm_encoder_helper_funcs.mode_valid | |
380 | * helpers can perform driver and/or source specific checks which are also | |
381 | * enforced by the modeset/atomic helpers | |
5dec293b VS |
382 | * |
383 | * 5. Any mode whose status is not OK is pruned from the connector's modes list, | |
384 | * accompanied by a debug message indicating the reason for the mode's | |
385 | * rejection (see drm_mode_prune_invalid()). | |
6af3e656 VS |
386 | * |
387 | * Returns: | |
388 | * The number of modes found on @connector. | |
389 | */ | |
390 | int drm_helper_probe_single_connector_modes(struct drm_connector *connector, | |
391 | uint32_t maxX, uint32_t maxY) | |
8d754544 DV |
392 | { |
393 | struct drm_device *dev = connector->dev; | |
394 | struct drm_display_mode *mode; | |
be26a66d | 395 | const struct drm_connector_helper_funcs *connector_funcs = |
8d754544 | 396 | connector->helper_private; |
6c5ed5ae | 397 | int count = 0, ret; |
8d754544 DV |
398 | int mode_flags = 0; |
399 | bool verbose_prune = true; | |
162b6a57 | 400 | enum drm_connector_status old_status; |
6c5ed5ae | 401 | struct drm_modeset_acquire_ctx ctx; |
8d754544 DV |
402 | |
403 | WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); | |
404 | ||
6c5ed5ae ML |
405 | drm_modeset_acquire_init(&ctx, 0); |
406 | ||
8d754544 | 407 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, |
25933820 | 408 | connector->name); |
6c5ed5ae ML |
409 | |
410 | retry: | |
411 | ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx); | |
412 | if (ret == -EDEADLK) { | |
413 | drm_modeset_backoff(&ctx); | |
414 | goto retry; | |
415 | } else | |
416 | WARN_ON(ret < 0); | |
417 | ||
5ba89406 | 418 | /* set all old modes to the stale state */ |
8d754544 | 419 | list_for_each_entry(mode, &connector->modes, head) |
5ba89406 | 420 | mode->status = MODE_STALE; |
8d754544 | 421 | |
ed293f77 DV |
422 | old_status = connector->status; |
423 | ||
8d754544 | 424 | if (connector->force) { |
2c4cc91b PH |
425 | if (connector->force == DRM_FORCE_ON || |
426 | connector->force == DRM_FORCE_ON_DIGITAL) | |
8d754544 DV |
427 | connector->status = connector_status_connected; |
428 | else | |
429 | connector->status = connector_status_disconnected; | |
430 | if (connector->funcs->force) | |
431 | connector->funcs->force(connector); | |
432 | } else { | |
6c5ed5ae ML |
433 | ret = drm_helper_probe_detect(connector, &ctx, true); |
434 | ||
435 | if (ret == -EDEADLK) { | |
436 | drm_modeset_backoff(&ctx); | |
437 | goto retry; | |
438 | } else if (WARN(ret < 0, "Invalid return value %i for connector detection\n", ret)) | |
439 | ret = connector_status_unknown; | |
440 | ||
441 | connector->status = ret; | |
ed293f77 DV |
442 | } |
443 | ||
444 | /* | |
445 | * Normally either the driver's hpd code or the poll loop should | |
446 | * pick up any changes and fire the hotplug event. But if | |
447 | * userspace sneaks in a probe, we might miss a change. Hence | |
448 | * check here, and if anything changed start the hotplug code. | |
449 | */ | |
450 | if (old_status != connector->status) { | |
4e15f2a1 | 451 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", |
ed293f77 DV |
452 | connector->base.id, |
453 | connector->name, | |
4e15f2a1 JN |
454 | drm_get_connector_status_name(old_status), |
455 | drm_get_connector_status_name(connector->status)); | |
162b6a57 DV |
456 | |
457 | /* | |
ed293f77 DV |
458 | * The hotplug event code might call into the fb |
459 | * helpers, and so expects that we do not hold any | |
460 | * locks. Fire up the poll struct instead, it will | |
461 | * disable itself again. | |
162b6a57 | 462 | */ |
ed293f77 DV |
463 | dev->mode_config.delayed_event = true; |
464 | if (dev->mode_config.poll_enabled) | |
465 | schedule_delayed_work(&dev->mode_config.output_poll_work, | |
466 | 0); | |
8d754544 DV |
467 | } |
468 | ||
469 | /* Re-enable polling in case the global poll config changed. */ | |
470 | if (drm_kms_helper_poll != dev->mode_config.poll_running) | |
c4d79c22 | 471 | drm_kms_helper_poll_enable(dev); |
8d754544 DV |
472 | |
473 | dev->mode_config.poll_running = drm_kms_helper_poll; | |
474 | ||
475 | if (connector->status == connector_status_disconnected) { | |
476 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n", | |
25933820 | 477 | connector->base.id, connector->name); |
8d754544 DV |
478 | drm_mode_connector_update_edid_property(connector, NULL); |
479 | verbose_prune = false; | |
480 | goto prune; | |
481 | } | |
482 | ||
53fd40a9 | 483 | count = (*connector_funcs->get_modes)(connector); |
8d754544 DV |
484 | |
485 | if (count == 0 && connector->status == connector_status_connected) | |
486 | count = drm_add_modes_noedid(connector, 1024, 768); | |
eaf99c74 | 487 | count += drm_helper_probe_add_cmdline_mode(connector); |
8d754544 DV |
488 | if (count == 0) |
489 | goto prune; | |
490 | ||
6af3e656 | 491 | drm_mode_connector_list_update(connector); |
8d754544 | 492 | |
8d754544 DV |
493 | if (connector->interlace_allowed) |
494 | mode_flags |= DRM_MODE_FLAG_INTERLACE; | |
495 | if (connector->doublescan_allowed) | |
496 | mode_flags |= DRM_MODE_FLAG_DBLSCAN; | |
497 | if (connector->stereo_allowed) | |
498 | mode_flags |= DRM_MODE_FLAG_3D_MASK; | |
8d754544 DV |
499 | |
500 | list_for_each_entry(mode, &connector->modes, head) { | |
be8719a6 VS |
501 | if (mode->status == MODE_OK) |
502 | mode->status = drm_mode_validate_basic(mode); | |
abc0b144 VS |
503 | |
504 | if (mode->status == MODE_OK) | |
505 | mode->status = drm_mode_validate_size(mode, maxX, maxY); | |
05acaec3 VS |
506 | |
507 | if (mode->status == MODE_OK) | |
508 | mode->status = drm_mode_validate_flag(mode, mode_flags); | |
509 | ||
97f973d6 JA |
510 | if (mode->status == MODE_OK) |
511 | mode->status = drm_mode_validate_pipeline(mode, | |
512 | connector); | |
d8523153 SS |
513 | |
514 | if (mode->status == MODE_OK) | |
515 | mode->status = drm_mode_validate_ycbcr420(mode, | |
516 | connector); | |
8d754544 DV |
517 | } |
518 | ||
519 | prune: | |
520 | drm_mode_prune_invalid(dev, &connector->modes, verbose_prune); | |
521 | ||
6c5ed5ae ML |
522 | drm_modeset_drop_locks(&ctx); |
523 | drm_modeset_acquire_fini(&ctx); | |
524 | ||
8d754544 DV |
525 | if (list_empty(&connector->modes)) |
526 | return 0; | |
527 | ||
528 | list_for_each_entry(mode, &connector->modes, head) | |
529 | mode->vrefresh = drm_mode_vrefresh(mode); | |
530 | ||
531 | drm_mode_sort(&connector->modes); | |
532 | ||
533 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id, | |
25933820 | 534 | connector->name); |
8d754544 DV |
535 | list_for_each_entry(mode, &connector->modes, head) { |
536 | drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V); | |
537 | drm_mode_debug_printmodeline(mode); | |
538 | } | |
539 | ||
540 | return count; | |
541 | } | |
542 | EXPORT_SYMBOL(drm_helper_probe_single_connector_modes); | |
543 | ||
544 | /** | |
545 | * drm_kms_helper_hotplug_event - fire off KMS hotplug events | |
546 | * @dev: drm_device whose connector state changed | |
547 | * | |
548 | * This function fires off the uevent for userspace and also calls the | |
549 | * output_poll_changed function, which is most commonly used to inform the fbdev | |
550 | * emulation code and allow it to update the fbcon output configuration. | |
551 | * | |
552 | * Drivers should call this from their hotplug handling code when a change is | |
553 | * detected. Note that this function does not do any output detection of its | |
554 | * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the | |
555 | * driver already. | |
556 | * | |
557 | * This function must be called from process context with no mode | |
558 | * setting locks held. | |
559 | */ | |
560 | void drm_kms_helper_hotplug_event(struct drm_device *dev) | |
561 | { | |
562 | /* send a uevent + call fbdev */ | |
563 | drm_sysfs_hotplug_event(dev); | |
564 | if (dev->mode_config.funcs->output_poll_changed) | |
565 | dev->mode_config.funcs->output_poll_changed(dev); | |
566 | } | |
567 | EXPORT_SYMBOL(drm_kms_helper_hotplug_event); | |
568 | ||
8d754544 DV |
569 | static void output_poll_execute(struct work_struct *work) |
570 | { | |
571 | struct delayed_work *delayed_work = to_delayed_work(work); | |
572 | struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work); | |
573 | struct drm_connector *connector; | |
c36a3254 | 574 | struct drm_connector_list_iter conn_iter; |
8d754544 | 575 | enum drm_connector_status old_status; |
162b6a57 DV |
576 | bool repoll = false, changed; |
577 | ||
578 | /* Pick up any changes detected by the probe functions. */ | |
579 | changed = dev->mode_config.delayed_event; | |
580 | dev->mode_config.delayed_event = false; | |
8d754544 DV |
581 | |
582 | if (!drm_kms_helper_poll) | |
162b6a57 | 583 | goto out; |
8d754544 | 584 | |
1fe7841d CW |
585 | if (!mutex_trylock(&dev->mode_config.mutex)) { |
586 | repoll = true; | |
587 | goto out; | |
588 | } | |
589 | ||
b982dab1 | 590 | drm_connector_list_iter_begin(dev, &conn_iter); |
c36a3254 | 591 | drm_for_each_connector_iter(connector, &conn_iter) { |
8d754544 DV |
592 | /* Ignore forced connectors. */ |
593 | if (connector->force) | |
594 | continue; | |
595 | ||
596 | /* Ignore HPD capable connectors and connectors where we don't | |
597 | * want any hotplug detection at all for polling. */ | |
598 | if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD) | |
599 | continue; | |
600 | ||
8d754544 DV |
601 | old_status = connector->status; |
602 | /* if we are connected and don't want to poll for disconnect | |
603 | skip it */ | |
604 | if (old_status == connector_status_connected && | |
605 | !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT)) | |
606 | continue; | |
607 | ||
a3c6d686 JH |
608 | repoll = true; |
609 | ||
6c5ed5ae | 610 | connector->status = drm_helper_probe_detect(connector, NULL, false); |
8d754544 DV |
611 | if (old_status != connector->status) { |
612 | const char *old, *new; | |
613 | ||
b7703726 DV |
614 | /* |
615 | * The poll work sets force=false when calling detect so | |
616 | * that drivers can avoid to do disruptive tests (e.g. | |
617 | * when load detect cycles could cause flickering on | |
618 | * other, running displays). This bears the risk that we | |
619 | * flip-flop between unknown here in the poll work and | |
620 | * the real state when userspace forces a full detect | |
621 | * call after receiving a hotplug event due to this | |
622 | * change. | |
623 | * | |
624 | * Hence clamp an unknown detect status to the old | |
625 | * value. | |
626 | */ | |
627 | if (connector->status == connector_status_unknown) { | |
628 | connector->status = old_status; | |
629 | continue; | |
630 | } | |
631 | ||
8d754544 DV |
632 | old = drm_get_connector_status_name(old_status); |
633 | new = drm_get_connector_status_name(connector->status); | |
634 | ||
635 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] " | |
636 | "status updated from %s to %s\n", | |
637 | connector->base.id, | |
25933820 | 638 | connector->name, |
8d754544 DV |
639 | old, new); |
640 | ||
641 | changed = true; | |
642 | } | |
643 | } | |
b982dab1 | 644 | drm_connector_list_iter_end(&conn_iter); |
8d754544 DV |
645 | |
646 | mutex_unlock(&dev->mode_config.mutex); | |
647 | ||
162b6a57 | 648 | out: |
8d754544 DV |
649 | if (changed) |
650 | drm_kms_helper_hotplug_event(dev); | |
651 | ||
652 | if (repoll) | |
653 | schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD); | |
654 | } | |
655 | ||
25c058cc LW |
656 | /** |
657 | * drm_kms_helper_is_poll_worker - is %current task an output poll worker? | |
658 | * | |
659 | * Determine if %current task is an output poll worker. This can be used | |
660 | * to select distinct code paths for output polling versus other contexts. | |
661 | * | |
662 | * One use case is to avoid a deadlock between the output poll worker and | |
663 | * the autosuspend worker wherein the latter waits for polling to finish | |
664 | * upon calling drm_kms_helper_poll_disable(), while the former waits for | |
665 | * runtime suspend to finish upon calling pm_runtime_get_sync() in a | |
666 | * connector ->detect hook. | |
667 | */ | |
668 | bool drm_kms_helper_is_poll_worker(void) | |
669 | { | |
670 | struct work_struct *work = current_work(); | |
671 | ||
672 | return work && work->func == output_poll_execute; | |
673 | } | |
674 | EXPORT_SYMBOL(drm_kms_helper_is_poll_worker); | |
675 | ||
8d754544 DV |
676 | /** |
677 | * drm_kms_helper_poll_disable - disable output polling | |
678 | * @dev: drm_device | |
679 | * | |
680 | * This function disables the output polling work. | |
681 | * | |
682 | * Drivers can call this helper from their device suspend implementation. It is | |
c4d79c22 DA |
683 | * not an error to call this even when output polling isn't enabled or already |
684 | * disabled. Polling is re-enabled by calling drm_kms_helper_poll_enable(). | |
685 | * | |
686 | * Note that calls to enable and disable polling must be strictly ordered, which | |
687 | * is automatically the case when they're only call from suspend/resume | |
688 | * callbacks. | |
8d754544 DV |
689 | */ |
690 | void drm_kms_helper_poll_disable(struct drm_device *dev) | |
691 | { | |
692 | if (!dev->mode_config.poll_enabled) | |
693 | return; | |
694 | cancel_delayed_work_sync(&dev->mode_config.output_poll_work); | |
695 | } | |
696 | EXPORT_SYMBOL(drm_kms_helper_poll_disable); | |
697 | ||
8d754544 DV |
698 | /** |
699 | * drm_kms_helper_poll_init - initialize and enable output polling | |
700 | * @dev: drm_device | |
701 | * | |
702 | * This function intializes and then also enables output polling support for | |
703 | * @dev. Drivers which do not have reliable hotplug support in hardware can use | |
704 | * this helper infrastructure to regularly poll such connectors for changes in | |
705 | * their connection state. | |
706 | * | |
707 | * Drivers can control which connectors are polled by setting the | |
708 | * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On | |
709 | * connectors where probing live outputs can result in visual distortion drivers | |
710 | * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this. | |
711 | * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are | |
712 | * completely ignored by the polling logic. | |
713 | * | |
714 | * Note that a connector can be both polled and probed from the hotplug handler, | |
715 | * in case the hotplug interrupt is known to be unreliable. | |
716 | */ | |
717 | void drm_kms_helper_poll_init(struct drm_device *dev) | |
718 | { | |
719 | INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute); | |
720 | dev->mode_config.poll_enabled = true; | |
721 | ||
722 | drm_kms_helper_poll_enable(dev); | |
723 | } | |
724 | EXPORT_SYMBOL(drm_kms_helper_poll_init); | |
725 | ||
726 | /** | |
727 | * drm_kms_helper_poll_fini - disable output polling and clean it up | |
728 | * @dev: drm_device | |
729 | */ | |
730 | void drm_kms_helper_poll_fini(struct drm_device *dev) | |
731 | { | |
732 | drm_kms_helper_poll_disable(dev); | |
733 | } | |
734 | EXPORT_SYMBOL(drm_kms_helper_poll_fini); | |
735 | ||
736 | /** | |
737 | * drm_helper_hpd_irq_event - hotplug processing | |
738 | * @dev: drm_device | |
739 | * | |
740 | * Drivers can use this helper function to run a detect cycle on all connectors | |
741 | * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All | |
742 | * other connectors are ignored, which is useful to avoid reprobing fixed | |
743 | * panels. | |
744 | * | |
745 | * This helper function is useful for drivers which can't or don't track hotplug | |
746 | * interrupts for each connector. | |
747 | * | |
748 | * Drivers which support hotplug interrupts for each connector individually and | |
749 | * which have a more fine-grained detect logic should bypass this code and | |
750 | * directly call drm_kms_helper_hotplug_event() in case the connector state | |
751 | * changed. | |
752 | * | |
753 | * This function must be called from process context with no mode | |
754 | * setting locks held. | |
755 | * | |
756 | * Note that a connector can be both polled and probed from the hotplug handler, | |
757 | * in case the hotplug interrupt is known to be unreliable. | |
758 | */ | |
759 | bool drm_helper_hpd_irq_event(struct drm_device *dev) | |
760 | { | |
761 | struct drm_connector *connector; | |
c36a3254 | 762 | struct drm_connector_list_iter conn_iter; |
8d754544 DV |
763 | enum drm_connector_status old_status; |
764 | bool changed = false; | |
765 | ||
766 | if (!dev->mode_config.poll_enabled) | |
767 | return false; | |
768 | ||
769 | mutex_lock(&dev->mode_config.mutex); | |
b982dab1 | 770 | drm_connector_list_iter_begin(dev, &conn_iter); |
c36a3254 | 771 | drm_for_each_connector_iter(connector, &conn_iter) { |
8d754544 DV |
772 | /* Only handle HPD capable connectors. */ |
773 | if (!(connector->polled & DRM_CONNECTOR_POLL_HPD)) | |
774 | continue; | |
775 | ||
776 | old_status = connector->status; | |
777 | ||
6c5ed5ae | 778 | connector->status = drm_helper_probe_detect(connector, NULL, false); |
8d754544 DV |
779 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", |
780 | connector->base.id, | |
25933820 | 781 | connector->name, |
8d754544 DV |
782 | drm_get_connector_status_name(old_status), |
783 | drm_get_connector_status_name(connector->status)); | |
784 | if (old_status != connector->status) | |
785 | changed = true; | |
786 | } | |
b982dab1 | 787 | drm_connector_list_iter_end(&conn_iter); |
8d754544 DV |
788 | mutex_unlock(&dev->mode_config.mutex); |
789 | ||
790 | if (changed) | |
791 | drm_kms_helper_hotplug_event(dev); | |
792 | ||
793 | return changed; | |
794 | } | |
795 | EXPORT_SYMBOL(drm_helper_hpd_irq_event); |