Line data Source code
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/drm_bridge.h>
36 : #include <drm/drm_client.h>
37 : #include <drm/drm_crtc.h>
38 : #include <drm/drm_edid.h>
39 : #include <drm/drm_fourcc.h>
40 : #include <drm/drm_modeset_helper_vtables.h>
41 : #include <drm/drm_print.h>
42 : #include <drm/drm_probe_helper.h>
43 : #include <drm/drm_sysfs.h>
44 :
45 : #include "drm_crtc_helper_internal.h"
46 :
47 : /**
48 : * DOC: output probing helper overview
49 : *
50 : * This library provides some helper code for output probing. It provides an
51 : * implementation of the core &drm_connector_funcs.fill_modes interface with
52 : * drm_helper_probe_single_connector_modes().
53 : *
54 : * It also provides support for polling connectors with a work item and for
55 : * generic hotplug interrupt handling where the driver doesn't or cannot keep
56 : * track of a per-connector hpd interrupt.
57 : *
58 : * This helper library can be used independently of the modeset helper library.
59 : * Drivers can also overwrite different parts e.g. use their own hotplug
60 : * handling code to avoid probing unrelated outputs.
61 : *
62 : * The probe helpers share the function table structures with other display
63 : * helper libraries. See &struct drm_connector_helper_funcs for the details.
64 : */
65 :
66 : static bool drm_kms_helper_poll = true;
67 : module_param_named(poll, drm_kms_helper_poll, bool, 0600);
68 :
69 : static enum drm_mode_status
70 : drm_mode_validate_flag(const struct drm_display_mode *mode,
71 : int flags)
72 : {
73 0 : if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
74 0 : !(flags & DRM_MODE_FLAG_INTERLACE))
75 : return MODE_NO_INTERLACE;
76 :
77 0 : if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
78 0 : !(flags & DRM_MODE_FLAG_DBLSCAN))
79 : return MODE_NO_DBLESCAN;
80 :
81 0 : if ((mode->flags & DRM_MODE_FLAG_3D_MASK) &&
82 0 : !(flags & DRM_MODE_FLAG_3D_MASK))
83 : return MODE_NO_STEREO;
84 :
85 : return MODE_OK;
86 : }
87 :
88 : static int
89 0 : drm_mode_validate_pipeline(struct drm_display_mode *mode,
90 : struct drm_connector *connector,
91 : struct drm_modeset_acquire_ctx *ctx,
92 : enum drm_mode_status *status)
93 : {
94 0 : struct drm_device *dev = connector->dev;
95 : struct drm_encoder *encoder;
96 : int ret;
97 :
98 : /* Step 1: Validate against connector */
99 0 : ret = drm_connector_mode_valid(connector, mode, ctx, status);
100 0 : if (ret || *status != MODE_OK)
101 : return ret;
102 :
103 : /* Step 2: Validate against encoders and crtcs */
104 0 : drm_connector_for_each_possible_encoder(connector, encoder) {
105 : struct drm_bridge *bridge;
106 : struct drm_crtc *crtc;
107 :
108 0 : *status = drm_encoder_mode_valid(encoder, mode);
109 0 : if (*status != 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 0 : continue;
115 : }
116 :
117 0 : bridge = drm_bridge_chain_get_first_bridge(encoder);
118 0 : *status = drm_bridge_chain_mode_valid(bridge,
119 0 : &connector->display_info,
120 : mode);
121 0 : if (*status != MODE_OK) {
122 : /* There is also no point in continuing for crtc check
123 : * here. */
124 0 : continue;
125 : }
126 :
127 0 : drm_for_each_crtc(crtc, dev) {
128 0 : if (!drm_encoder_crtc_ok(encoder, crtc))
129 0 : continue;
130 :
131 0 : *status = drm_crtc_mode_valid(crtc, mode);
132 0 : if (*status == MODE_OK) {
133 : /* If we get to this point there is at least
134 : * one combination of encoder+crtc that works
135 : * for this mode. Lets return now. */
136 : return 0;
137 : }
138 : }
139 : }
140 :
141 : return 0;
142 : }
143 :
144 0 : static int drm_helper_probe_add_cmdline_mode(struct drm_connector *connector)
145 : {
146 : struct drm_cmdline_mode *cmdline_mode;
147 : struct drm_display_mode *mode;
148 :
149 0 : cmdline_mode = &connector->cmdline_mode;
150 0 : if (!cmdline_mode->specified)
151 : return 0;
152 :
153 : /* Only add a GTF mode if we find no matching probed modes */
154 0 : list_for_each_entry(mode, &connector->probed_modes, head) {
155 0 : if (mode->hdisplay != cmdline_mode->xres ||
156 0 : mode->vdisplay != cmdline_mode->yres)
157 0 : continue;
158 :
159 0 : if (cmdline_mode->refresh_specified) {
160 : /* The probed mode's vrefresh is set until later */
161 0 : if (drm_mode_vrefresh(mode) != cmdline_mode->refresh)
162 0 : continue;
163 : }
164 :
165 : /* Mark the matching mode as being preferred by the user */
166 0 : mode->type |= DRM_MODE_TYPE_USERDEF;
167 0 : return 0;
168 : }
169 :
170 0 : mode = drm_mode_create_from_cmdline_mode(connector->dev,
171 : cmdline_mode);
172 0 : if (mode == NULL)
173 : return 0;
174 :
175 0 : drm_mode_probed_add(connector, mode);
176 0 : return 1;
177 : }
178 :
179 0 : enum drm_mode_status drm_crtc_mode_valid(struct drm_crtc *crtc,
180 : const struct drm_display_mode *mode)
181 : {
182 0 : const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
183 :
184 0 : if (!crtc_funcs || !crtc_funcs->mode_valid)
185 : return MODE_OK;
186 :
187 0 : return crtc_funcs->mode_valid(crtc, mode);
188 : }
189 :
190 0 : enum drm_mode_status drm_encoder_mode_valid(struct drm_encoder *encoder,
191 : const struct drm_display_mode *mode)
192 : {
193 0 : const struct drm_encoder_helper_funcs *encoder_funcs =
194 : encoder->helper_private;
195 :
196 0 : if (!encoder_funcs || !encoder_funcs->mode_valid)
197 : return MODE_OK;
198 :
199 0 : return encoder_funcs->mode_valid(encoder, mode);
200 : }
201 :
202 : int
203 0 : drm_connector_mode_valid(struct drm_connector *connector,
204 : struct drm_display_mode *mode,
205 : struct drm_modeset_acquire_ctx *ctx,
206 : enum drm_mode_status *status)
207 : {
208 0 : const struct drm_connector_helper_funcs *connector_funcs =
209 : connector->helper_private;
210 0 : int ret = 0;
211 :
212 0 : if (!connector_funcs)
213 0 : *status = MODE_OK;
214 0 : else if (connector_funcs->mode_valid_ctx)
215 0 : ret = connector_funcs->mode_valid_ctx(connector, mode, ctx,
216 : status);
217 0 : else if (connector_funcs->mode_valid)
218 0 : *status = connector_funcs->mode_valid(connector, mode);
219 : else
220 0 : *status = MODE_OK;
221 :
222 0 : return ret;
223 : }
224 :
225 0 : static void drm_kms_helper_disable_hpd(struct drm_device *dev)
226 : {
227 : struct drm_connector *connector;
228 : struct drm_connector_list_iter conn_iter;
229 :
230 0 : drm_connector_list_iter_begin(dev, &conn_iter);
231 0 : drm_for_each_connector_iter(connector, &conn_iter) {
232 0 : const struct drm_connector_helper_funcs *funcs =
233 : connector->helper_private;
234 :
235 0 : if (funcs && funcs->disable_hpd)
236 0 : funcs->disable_hpd(connector);
237 : }
238 0 : drm_connector_list_iter_end(&conn_iter);
239 0 : }
240 :
241 0 : static bool drm_kms_helper_enable_hpd(struct drm_device *dev)
242 : {
243 0 : bool poll = false;
244 : struct drm_connector *connector;
245 : struct drm_connector_list_iter conn_iter;
246 :
247 0 : drm_connector_list_iter_begin(dev, &conn_iter);
248 0 : drm_for_each_connector_iter(connector, &conn_iter) {
249 0 : const struct drm_connector_helper_funcs *funcs =
250 : connector->helper_private;
251 :
252 0 : if (funcs && funcs->enable_hpd)
253 0 : funcs->enable_hpd(connector);
254 :
255 0 : if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
256 : DRM_CONNECTOR_POLL_DISCONNECT))
257 0 : poll = true;
258 : }
259 0 : drm_connector_list_iter_end(&conn_iter);
260 :
261 0 : return poll;
262 : }
263 :
264 : #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
265 : /**
266 : * drm_kms_helper_poll_enable - re-enable output polling.
267 : * @dev: drm_device
268 : *
269 : * This function re-enables the output polling work, after it has been
270 : * temporarily disabled using drm_kms_helper_poll_disable(), for example over
271 : * suspend/resume.
272 : *
273 : * Drivers can call this helper from their device resume implementation. It is
274 : * not an error to call this even when output polling isn't enabled.
275 : *
276 : * Note that calls to enable and disable polling must be strictly ordered, which
277 : * is automatically the case when they're only call from suspend/resume
278 : * callbacks.
279 : */
280 0 : void drm_kms_helper_poll_enable(struct drm_device *dev)
281 : {
282 0 : bool poll = false;
283 0 : unsigned long delay = DRM_OUTPUT_POLL_PERIOD;
284 :
285 0 : if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll ||
286 0 : dev->mode_config.poll_running)
287 : return;
288 :
289 0 : poll = drm_kms_helper_enable_hpd(dev);
290 :
291 0 : if (dev->mode_config.delayed_event) {
292 : /*
293 : * FIXME:
294 : *
295 : * Use short (1s) delay to handle the initial delayed event.
296 : * This delay should not be needed, but Optimus/nouveau will
297 : * fail in a mysterious way if the delayed event is handled as
298 : * soon as possible like it is done in
299 : * drm_helper_probe_single_connector_modes() in case the poll
300 : * was enabled before.
301 : */
302 0 : poll = true;
303 0 : delay = HZ;
304 : }
305 :
306 0 : if (poll)
307 0 : schedule_delayed_work(&dev->mode_config.output_poll_work, delay);
308 :
309 0 : dev->mode_config.poll_running = true;
310 : }
311 : EXPORT_SYMBOL(drm_kms_helper_poll_enable);
312 :
313 : static enum drm_connector_status
314 0 : drm_helper_probe_detect_ctx(struct drm_connector *connector, bool force)
315 : {
316 0 : const struct drm_connector_helper_funcs *funcs = connector->helper_private;
317 : struct drm_modeset_acquire_ctx ctx;
318 : int ret;
319 :
320 0 : drm_modeset_acquire_init(&ctx, 0);
321 :
322 : retry:
323 0 : ret = drm_modeset_lock(&connector->dev->mode_config.connection_mutex, &ctx);
324 0 : if (!ret) {
325 0 : if (funcs->detect_ctx)
326 0 : ret = funcs->detect_ctx(connector, &ctx, force);
327 0 : else if (connector->funcs->detect)
328 0 : ret = connector->funcs->detect(connector, force);
329 : else
330 : ret = connector_status_connected;
331 : }
332 :
333 0 : if (ret == -EDEADLK) {
334 0 : drm_modeset_backoff(&ctx);
335 0 : goto retry;
336 : }
337 :
338 0 : if (WARN_ON(ret < 0))
339 0 : ret = connector_status_unknown;
340 :
341 0 : if (ret != connector->status)
342 0 : connector->epoch_counter += 1;
343 :
344 0 : drm_modeset_drop_locks(&ctx);
345 0 : drm_modeset_acquire_fini(&ctx);
346 :
347 0 : return ret;
348 : }
349 :
350 : /**
351 : * drm_helper_probe_detect - probe connector status
352 : * @connector: connector to probe
353 : * @ctx: acquire_ctx, or NULL to let this function handle locking.
354 : * @force: Whether destructive probe operations should be performed.
355 : *
356 : * This function calls the detect callbacks of the connector.
357 : * This function returns &drm_connector_status, or
358 : * if @ctx is set, it might also return -EDEADLK.
359 : */
360 : int
361 0 : drm_helper_probe_detect(struct drm_connector *connector,
362 : struct drm_modeset_acquire_ctx *ctx,
363 : bool force)
364 : {
365 0 : const struct drm_connector_helper_funcs *funcs = connector->helper_private;
366 0 : struct drm_device *dev = connector->dev;
367 : int ret;
368 :
369 0 : if (!ctx)
370 0 : return drm_helper_probe_detect_ctx(connector, force);
371 :
372 0 : ret = drm_modeset_lock(&dev->mode_config.connection_mutex, ctx);
373 0 : if (ret)
374 : return ret;
375 :
376 0 : if (funcs->detect_ctx)
377 0 : ret = funcs->detect_ctx(connector, ctx, force);
378 0 : else if (connector->funcs->detect)
379 0 : ret = connector->funcs->detect(connector, force);
380 : else
381 : ret = connector_status_connected;
382 :
383 0 : if (ret != connector->status)
384 0 : connector->epoch_counter += 1;
385 :
386 : return ret;
387 : }
388 : EXPORT_SYMBOL(drm_helper_probe_detect);
389 :
390 0 : static int drm_helper_probe_get_modes(struct drm_connector *connector)
391 : {
392 0 : const struct drm_connector_helper_funcs *connector_funcs =
393 : connector->helper_private;
394 : int count;
395 :
396 0 : count = connector_funcs->get_modes(connector);
397 :
398 : /*
399 : * Fallback for when DDC probe failed in drm_get_edid() and thus skipped
400 : * override/firmware EDID.
401 : */
402 0 : if (count == 0 && connector->status == connector_status_connected)
403 0 : count = drm_edid_override_connector_update(connector);
404 :
405 0 : return count;
406 : }
407 :
408 0 : static int __drm_helper_update_and_validate(struct drm_connector *connector,
409 : uint32_t maxX, uint32_t maxY,
410 : struct drm_modeset_acquire_ctx *ctx)
411 : {
412 0 : struct drm_device *dev = connector->dev;
413 : struct drm_display_mode *mode;
414 0 : int mode_flags = 0;
415 : int ret;
416 :
417 0 : drm_connector_list_update(connector);
418 :
419 0 : if (connector->interlace_allowed)
420 0 : mode_flags |= DRM_MODE_FLAG_INTERLACE;
421 0 : if (connector->doublescan_allowed)
422 0 : mode_flags |= DRM_MODE_FLAG_DBLSCAN;
423 0 : if (connector->stereo_allowed)
424 0 : mode_flags |= DRM_MODE_FLAG_3D_MASK;
425 :
426 0 : list_for_each_entry(mode, &connector->modes, head) {
427 0 : if (mode->status != MODE_OK)
428 0 : continue;
429 :
430 0 : mode->status = drm_mode_validate_driver(dev, mode);
431 0 : if (mode->status != MODE_OK)
432 0 : continue;
433 :
434 0 : mode->status = drm_mode_validate_size(mode, maxX, maxY);
435 0 : if (mode->status != MODE_OK)
436 0 : continue;
437 :
438 0 : mode->status = drm_mode_validate_flag(mode, mode_flags);
439 0 : if (mode->status != MODE_OK)
440 0 : continue;
441 :
442 0 : ret = drm_mode_validate_pipeline(mode, connector, ctx,
443 : &mode->status);
444 0 : if (ret) {
445 0 : drm_dbg_kms(dev,
446 : "drm_mode_validate_pipeline failed: %d\n",
447 : ret);
448 :
449 0 : if (drm_WARN_ON_ONCE(dev, ret != -EDEADLK))
450 0 : mode->status = MODE_ERROR;
451 : else
452 : return -EDEADLK;
453 : }
454 :
455 0 : if (mode->status != MODE_OK)
456 0 : continue;
457 0 : mode->status = drm_mode_validate_ycbcr420(mode, connector);
458 : }
459 :
460 : return 0;
461 : }
462 :
463 : /**
464 : * drm_helper_probe_single_connector_modes - get complete set of display modes
465 : * @connector: connector to probe
466 : * @maxX: max width for modes
467 : * @maxY: max height for modes
468 : *
469 : * Based on the helper callbacks implemented by @connector in struct
470 : * &drm_connector_helper_funcs try to detect all valid modes. Modes will first
471 : * be added to the connector's probed_modes list, then culled (based on validity
472 : * and the @maxX, @maxY parameters) and put into the normal modes list.
473 : *
474 : * Intended to be used as a generic implementation of the
475 : * &drm_connector_funcs.fill_modes() vfunc for drivers that use the CRTC helpers
476 : * for output mode filtering and detection.
477 : *
478 : * The basic procedure is as follows
479 : *
480 : * 1. All modes currently on the connector's modes list are marked as stale
481 : *
482 : * 2. New modes are added to the connector's probed_modes list with
483 : * drm_mode_probed_add(). New modes start their life with status as OK.
484 : * Modes are added from a single source using the following priority order.
485 : *
486 : * - &drm_connector_helper_funcs.get_modes vfunc
487 : * - if the connector status is connector_status_connected, standard
488 : * VESA DMT modes up to 1024x768 are automatically added
489 : * (drm_add_modes_noedid())
490 : *
491 : * Finally modes specified via the kernel command line (video=...) are
492 : * added in addition to what the earlier probes produced
493 : * (drm_helper_probe_add_cmdline_mode()). These modes are generated
494 : * using the VESA GTF/CVT formulas.
495 : *
496 : * 3. Modes are moved from the probed_modes list to the modes list. Potential
497 : * duplicates are merged together (see drm_connector_list_update()).
498 : * After this step the probed_modes list will be empty again.
499 : *
500 : * 4. Any non-stale mode on the modes list then undergoes validation
501 : *
502 : * - drm_mode_validate_basic() performs basic sanity checks
503 : * - drm_mode_validate_size() filters out modes larger than @maxX and @maxY
504 : * (if specified)
505 : * - drm_mode_validate_flag() checks the modes against basic connector
506 : * capabilities (interlace_allowed,doublescan_allowed,stereo_allowed)
507 : * - the optional &drm_connector_helper_funcs.mode_valid or
508 : * &drm_connector_helper_funcs.mode_valid_ctx helpers can perform driver
509 : * and/or sink specific checks
510 : * - the optional &drm_crtc_helper_funcs.mode_valid,
511 : * &drm_bridge_funcs.mode_valid and &drm_encoder_helper_funcs.mode_valid
512 : * helpers can perform driver and/or source specific checks which are also
513 : * enforced by the modeset/atomic helpers
514 : *
515 : * 5. Any mode whose status is not OK is pruned from the connector's modes list,
516 : * accompanied by a debug message indicating the reason for the mode's
517 : * rejection (see drm_mode_prune_invalid()).
518 : *
519 : * Returns:
520 : * The number of modes found on @connector.
521 : */
522 0 : int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
523 : uint32_t maxX, uint32_t maxY)
524 : {
525 0 : struct drm_device *dev = connector->dev;
526 : struct drm_display_mode *mode;
527 0 : int count = 0, ret;
528 : enum drm_connector_status old_status;
529 : struct drm_modeset_acquire_ctx ctx;
530 :
531 0 : WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
532 :
533 0 : drm_modeset_acquire_init(&ctx, 0);
534 :
535 0 : DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
536 : connector->name);
537 :
538 : retry:
539 0 : ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx);
540 0 : if (ret == -EDEADLK) {
541 0 : drm_modeset_backoff(&ctx);
542 0 : goto retry;
543 : } else
544 0 : WARN_ON(ret < 0);
545 :
546 : /* set all old modes to the stale state */
547 0 : list_for_each_entry(mode, &connector->modes, head)
548 0 : mode->status = MODE_STALE;
549 :
550 0 : old_status = connector->status;
551 :
552 0 : if (connector->force) {
553 0 : if (connector->force == DRM_FORCE_ON ||
554 : connector->force == DRM_FORCE_ON_DIGITAL)
555 0 : connector->status = connector_status_connected;
556 : else
557 0 : connector->status = connector_status_disconnected;
558 0 : if (connector->funcs->force)
559 0 : connector->funcs->force(connector);
560 : } else {
561 0 : ret = drm_helper_probe_detect(connector, &ctx, true);
562 :
563 0 : if (ret == -EDEADLK) {
564 0 : drm_modeset_backoff(&ctx);
565 0 : goto retry;
566 0 : } else if (WARN(ret < 0, "Invalid return value %i for connector detection\n", ret))
567 0 : ret = connector_status_unknown;
568 :
569 0 : connector->status = ret;
570 : }
571 :
572 : /*
573 : * Normally either the driver's hpd code or the poll loop should
574 : * pick up any changes and fire the hotplug event. But if
575 : * userspace sneaks in a probe, we might miss a change. Hence
576 : * check here, and if anything changed start the hotplug code.
577 : */
578 0 : if (old_status != connector->status) {
579 0 : DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
580 : connector->base.id,
581 : connector->name,
582 : drm_get_connector_status_name(old_status),
583 : drm_get_connector_status_name(connector->status));
584 :
585 : /*
586 : * The hotplug event code might call into the fb
587 : * helpers, and so expects that we do not hold any
588 : * locks. Fire up the poll struct instead, it will
589 : * disable itself again.
590 : */
591 0 : dev->mode_config.delayed_event = true;
592 0 : if (dev->mode_config.poll_enabled)
593 0 : mod_delayed_work(system_wq,
594 : &dev->mode_config.output_poll_work,
595 : 0);
596 : }
597 :
598 : /* Re-enable polling in case the global poll config changed. */
599 0 : drm_kms_helper_poll_enable(dev);
600 :
601 0 : if (connector->status == connector_status_disconnected) {
602 0 : DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
603 : connector->base.id, connector->name);
604 0 : drm_connector_update_edid_property(connector, NULL);
605 0 : drm_mode_prune_invalid(dev, &connector->modes, false);
606 0 : goto exit;
607 : }
608 :
609 0 : count = drm_helper_probe_get_modes(connector);
610 :
611 0 : if (count == 0 && (connector->status == connector_status_connected ||
612 : connector->status == connector_status_unknown)) {
613 0 : count = drm_add_modes_noedid(connector, 1024, 768);
614 :
615 : /*
616 : * Section 4.2.2.6 (EDID Corruption Detection) of the DP 1.4a
617 : * Link CTS specifies that 640x480 (the official "failsafe"
618 : * mode) needs to be the default if there's no EDID.
619 : */
620 0 : if (connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort)
621 0 : drm_set_preferred_mode(connector, 640, 480);
622 : }
623 0 : count += drm_helper_probe_add_cmdline_mode(connector);
624 0 : if (count != 0) {
625 0 : ret = __drm_helper_update_and_validate(connector, maxX, maxY, &ctx);
626 0 : if (ret == -EDEADLK) {
627 0 : drm_modeset_backoff(&ctx);
628 0 : goto retry;
629 : }
630 : }
631 :
632 0 : drm_mode_prune_invalid(dev, &connector->modes, true);
633 :
634 : /*
635 : * Displayport spec section 5.2.1.2 ("Video Timing Format") says that
636 : * all detachable sinks shall support 640x480 @60Hz as a fail safe
637 : * mode. If all modes were pruned, perhaps because they need more
638 : * lanes or a higher pixel clock than available, at least try to add
639 : * in 640x480.
640 : */
641 0 : if (list_empty(&connector->modes) &&
642 0 : connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort) {
643 0 : count = drm_add_modes_noedid(connector, 640, 480);
644 0 : ret = __drm_helper_update_and_validate(connector, maxX, maxY, &ctx);
645 0 : if (ret == -EDEADLK) {
646 0 : drm_modeset_backoff(&ctx);
647 0 : goto retry;
648 : }
649 0 : drm_mode_prune_invalid(dev, &connector->modes, true);
650 : }
651 :
652 : exit:
653 0 : drm_modeset_drop_locks(&ctx);
654 0 : drm_modeset_acquire_fini(&ctx);
655 :
656 0 : if (list_empty(&connector->modes))
657 : return 0;
658 :
659 0 : drm_mode_sort(&connector->modes);
660 :
661 0 : DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
662 : connector->name);
663 0 : list_for_each_entry(mode, &connector->modes, head) {
664 0 : drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
665 0 : drm_mode_debug_printmodeline(mode);
666 : }
667 :
668 : return count;
669 : }
670 : EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
671 :
672 : /**
673 : * drm_kms_helper_hotplug_event - fire off KMS hotplug events
674 : * @dev: drm_device whose connector state changed
675 : *
676 : * This function fires off the uevent for userspace and also calls the
677 : * output_poll_changed function, which is most commonly used to inform the fbdev
678 : * emulation code and allow it to update the fbcon output configuration.
679 : *
680 : * Drivers should call this from their hotplug handling code when a change is
681 : * detected. Note that this function does not do any output detection of its
682 : * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the
683 : * driver already.
684 : *
685 : * This function must be called from process context with no mode
686 : * setting locks held.
687 : *
688 : * If only a single connector has changed, consider calling
689 : * drm_kms_helper_connector_hotplug_event() instead.
690 : */
691 0 : void drm_kms_helper_hotplug_event(struct drm_device *dev)
692 : {
693 : /* send a uevent + call fbdev */
694 0 : drm_sysfs_hotplug_event(dev);
695 0 : if (dev->mode_config.funcs->output_poll_changed)
696 0 : dev->mode_config.funcs->output_poll_changed(dev);
697 :
698 0 : drm_client_dev_hotplug(dev);
699 0 : }
700 : EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
701 :
702 : /**
703 : * drm_kms_helper_connector_hotplug_event - fire off a KMS connector hotplug event
704 : * @connector: drm_connector which has changed
705 : *
706 : * This is the same as drm_kms_helper_hotplug_event(), except it fires a more
707 : * fine-grained uevent for a single connector.
708 : */
709 0 : void drm_kms_helper_connector_hotplug_event(struct drm_connector *connector)
710 : {
711 0 : struct drm_device *dev = connector->dev;
712 :
713 : /* send a uevent + call fbdev */
714 0 : drm_sysfs_connector_hotplug_event(connector);
715 0 : if (dev->mode_config.funcs->output_poll_changed)
716 0 : dev->mode_config.funcs->output_poll_changed(dev);
717 :
718 0 : drm_client_dev_hotplug(dev);
719 0 : }
720 : EXPORT_SYMBOL(drm_kms_helper_connector_hotplug_event);
721 :
722 0 : static void output_poll_execute(struct work_struct *work)
723 : {
724 0 : struct delayed_work *delayed_work = to_delayed_work(work);
725 0 : struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
726 : struct drm_connector *connector;
727 : struct drm_connector_list_iter conn_iter;
728 : enum drm_connector_status old_status;
729 0 : bool repoll = false, changed;
730 : u64 old_epoch_counter;
731 :
732 0 : if (!dev->mode_config.poll_enabled)
733 0 : return;
734 :
735 : /* Pick up any changes detected by the probe functions. */
736 0 : changed = dev->mode_config.delayed_event;
737 0 : dev->mode_config.delayed_event = false;
738 :
739 0 : if (!drm_kms_helper_poll && dev->mode_config.poll_running) {
740 0 : drm_kms_helper_disable_hpd(dev);
741 0 : dev->mode_config.poll_running = false;
742 0 : goto out;
743 : }
744 :
745 0 : if (!mutex_trylock(&dev->mode_config.mutex)) {
746 : repoll = true;
747 : goto out;
748 : }
749 :
750 0 : drm_connector_list_iter_begin(dev, &conn_iter);
751 0 : drm_for_each_connector_iter(connector, &conn_iter) {
752 : /* Ignore forced connectors. */
753 0 : if (connector->force)
754 0 : continue;
755 :
756 : /* Ignore HPD capable connectors and connectors where we don't
757 : * want any hotplug detection at all for polling. */
758 0 : if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
759 0 : continue;
760 :
761 0 : old_status = connector->status;
762 : /* if we are connected and don't want to poll for disconnect
763 : skip it */
764 0 : if (old_status == connector_status_connected &&
765 : !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
766 0 : continue;
767 :
768 0 : repoll = true;
769 :
770 0 : old_epoch_counter = connector->epoch_counter;
771 0 : connector->status = drm_helper_probe_detect(connector, NULL, false);
772 0 : if (old_epoch_counter != connector->epoch_counter) {
773 : const char *old, *new;
774 :
775 : /*
776 : * The poll work sets force=false when calling detect so
777 : * that drivers can avoid to do disruptive tests (e.g.
778 : * when load detect cycles could cause flickering on
779 : * other, running displays). This bears the risk that we
780 : * flip-flop between unknown here in the poll work and
781 : * the real state when userspace forces a full detect
782 : * call after receiving a hotplug event due to this
783 : * change.
784 : *
785 : * Hence clamp an unknown detect status to the old
786 : * value.
787 : */
788 0 : if (connector->status == connector_status_unknown) {
789 0 : connector->status = old_status;
790 0 : continue;
791 : }
792 :
793 0 : old = drm_get_connector_status_name(old_status);
794 0 : new = drm_get_connector_status_name(connector->status);
795 :
796 0 : DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
797 : "status updated from %s to %s\n",
798 : connector->base.id,
799 : connector->name,
800 : old, new);
801 0 : DRM_DEBUG_KMS("[CONNECTOR:%d:%s] epoch counter %llu -> %llu\n",
802 : connector->base.id, connector->name,
803 : old_epoch_counter, connector->epoch_counter);
804 :
805 0 : changed = true;
806 : }
807 : }
808 0 : drm_connector_list_iter_end(&conn_iter);
809 :
810 0 : mutex_unlock(&dev->mode_config.mutex);
811 :
812 : out:
813 0 : if (changed)
814 0 : drm_kms_helper_hotplug_event(dev);
815 :
816 0 : if (repoll)
817 : schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
818 : }
819 :
820 : /**
821 : * drm_kms_helper_is_poll_worker - is %current task an output poll worker?
822 : *
823 : * Determine if %current task is an output poll worker. This can be used
824 : * to select distinct code paths for output polling versus other contexts.
825 : *
826 : * One use case is to avoid a deadlock between the output poll worker and
827 : * the autosuspend worker wherein the latter waits for polling to finish
828 : * upon calling drm_kms_helper_poll_disable(), while the former waits for
829 : * runtime suspend to finish upon calling pm_runtime_get_sync() in a
830 : * connector ->detect hook.
831 : */
832 0 : bool drm_kms_helper_is_poll_worker(void)
833 : {
834 0 : struct work_struct *work = current_work();
835 :
836 0 : return work && work->func == output_poll_execute;
837 : }
838 : EXPORT_SYMBOL(drm_kms_helper_is_poll_worker);
839 :
840 : /**
841 : * drm_kms_helper_poll_disable - disable output polling
842 : * @dev: drm_device
843 : *
844 : * This function disables the output polling work.
845 : *
846 : * Drivers can call this helper from their device suspend implementation. It is
847 : * not an error to call this even when output polling isn't enabled or already
848 : * disabled. Polling is re-enabled by calling drm_kms_helper_poll_enable().
849 : *
850 : * Note that calls to enable and disable polling must be strictly ordered, which
851 : * is automatically the case when they're only call from suspend/resume
852 : * callbacks.
853 : */
854 0 : void drm_kms_helper_poll_disable(struct drm_device *dev)
855 : {
856 0 : if (dev->mode_config.poll_running)
857 0 : drm_kms_helper_disable_hpd(dev);
858 :
859 0 : cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
860 :
861 0 : dev->mode_config.poll_running = false;
862 0 : }
863 : EXPORT_SYMBOL(drm_kms_helper_poll_disable);
864 :
865 : /**
866 : * drm_kms_helper_poll_init - initialize and enable output polling
867 : * @dev: drm_device
868 : *
869 : * This function initializes and then also enables output polling support for
870 : * @dev. Drivers which do not have reliable hotplug support in hardware can use
871 : * this helper infrastructure to regularly poll such connectors for changes in
872 : * their connection state.
873 : *
874 : * Drivers can control which connectors are polled by setting the
875 : * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On
876 : * connectors where probing live outputs can result in visual distortion drivers
877 : * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this.
878 : * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are
879 : * completely ignored by the polling logic.
880 : *
881 : * Note that a connector can be both polled and probed from the hotplug handler,
882 : * in case the hotplug interrupt is known to be unreliable.
883 : */
884 0 : void drm_kms_helper_poll_init(struct drm_device *dev)
885 : {
886 0 : INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
887 0 : dev->mode_config.poll_enabled = true;
888 :
889 0 : drm_kms_helper_poll_enable(dev);
890 0 : }
891 : EXPORT_SYMBOL(drm_kms_helper_poll_init);
892 :
893 : /**
894 : * drm_kms_helper_poll_fini - disable output polling and clean it up
895 : * @dev: drm_device
896 : */
897 0 : void drm_kms_helper_poll_fini(struct drm_device *dev)
898 : {
899 0 : if (!dev->mode_config.poll_enabled)
900 : return;
901 :
902 0 : drm_kms_helper_poll_disable(dev);
903 :
904 0 : dev->mode_config.poll_enabled = false;
905 : }
906 : EXPORT_SYMBOL(drm_kms_helper_poll_fini);
907 :
908 0 : static bool check_connector_changed(struct drm_connector *connector)
909 : {
910 0 : struct drm_device *dev = connector->dev;
911 : enum drm_connector_status old_status;
912 : u64 old_epoch_counter;
913 :
914 : /* Only handle HPD capable connectors. */
915 0 : drm_WARN_ON(dev, !(connector->polled & DRM_CONNECTOR_POLL_HPD));
916 :
917 0 : drm_WARN_ON(dev, !mutex_is_locked(&dev->mode_config.mutex));
918 :
919 0 : old_status = connector->status;
920 0 : old_epoch_counter = connector->epoch_counter;
921 0 : connector->status = drm_helper_probe_detect(connector, NULL, false);
922 :
923 0 : if (old_epoch_counter == connector->epoch_counter) {
924 0 : drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Same epoch counter %llu\n",
925 : connector->base.id,
926 : connector->name,
927 : connector->epoch_counter);
928 :
929 0 : return false;
930 : }
931 :
932 0 : drm_dbg_kms(dev, "[CONNECTOR:%d:%s] status updated from %s to %s\n",
933 : connector->base.id,
934 : connector->name,
935 : drm_get_connector_status_name(old_status),
936 : drm_get_connector_status_name(connector->status));
937 :
938 0 : drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Changed epoch counter %llu => %llu\n",
939 : connector->base.id,
940 : connector->name,
941 : old_epoch_counter,
942 : connector->epoch_counter);
943 :
944 0 : return true;
945 : }
946 :
947 : /**
948 : * drm_connector_helper_hpd_irq_event - hotplug processing
949 : * @connector: drm_connector
950 : *
951 : * Drivers can use this helper function to run a detect cycle on a connector
952 : * which has the DRM_CONNECTOR_POLL_HPD flag set in its &polled member.
953 : *
954 : * This helper function is useful for drivers which can track hotplug
955 : * interrupts for a single connector. Drivers that want to send a
956 : * hotplug event for all connectors or can't track hotplug interrupts
957 : * per connector need to use drm_helper_hpd_irq_event().
958 : *
959 : * This function must be called from process context with no mode
960 : * setting locks held.
961 : *
962 : * Note that a connector can be both polled and probed from the hotplug
963 : * handler, in case the hotplug interrupt is known to be unreliable.
964 : *
965 : * Returns:
966 : * A boolean indicating whether the connector status changed or not
967 : */
968 0 : bool drm_connector_helper_hpd_irq_event(struct drm_connector *connector)
969 : {
970 0 : struct drm_device *dev = connector->dev;
971 : bool changed;
972 :
973 0 : mutex_lock(&dev->mode_config.mutex);
974 0 : changed = check_connector_changed(connector);
975 0 : mutex_unlock(&dev->mode_config.mutex);
976 :
977 0 : if (changed) {
978 0 : drm_kms_helper_connector_hotplug_event(connector);
979 0 : drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Sent hotplug event\n",
980 : connector->base.id,
981 : connector->name);
982 : }
983 :
984 0 : return changed;
985 : }
986 : EXPORT_SYMBOL(drm_connector_helper_hpd_irq_event);
987 :
988 : /**
989 : * drm_helper_hpd_irq_event - hotplug processing
990 : * @dev: drm_device
991 : *
992 : * Drivers can use this helper function to run a detect cycle on all connectors
993 : * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All
994 : * other connectors are ignored, which is useful to avoid reprobing fixed
995 : * panels.
996 : *
997 : * This helper function is useful for drivers which can't or don't track hotplug
998 : * interrupts for each connector.
999 : *
1000 : * Drivers which support hotplug interrupts for each connector individually and
1001 : * which have a more fine-grained detect logic can use
1002 : * drm_connector_helper_hpd_irq_event(). Alternatively, they should bypass this
1003 : * code and directly call drm_kms_helper_hotplug_event() in case the connector
1004 : * state changed.
1005 : *
1006 : * This function must be called from process context with no mode
1007 : * setting locks held.
1008 : *
1009 : * Note that a connector can be both polled and probed from the hotplug handler,
1010 : * in case the hotplug interrupt is known to be unreliable.
1011 : *
1012 : * Returns:
1013 : * A boolean indicating whether the connector status changed or not
1014 : */
1015 0 : bool drm_helper_hpd_irq_event(struct drm_device *dev)
1016 : {
1017 0 : struct drm_connector *connector, *first_changed_connector = NULL;
1018 : struct drm_connector_list_iter conn_iter;
1019 0 : int changed = 0;
1020 :
1021 0 : if (!dev->mode_config.poll_enabled)
1022 : return false;
1023 :
1024 0 : mutex_lock(&dev->mode_config.mutex);
1025 0 : drm_connector_list_iter_begin(dev, &conn_iter);
1026 0 : drm_for_each_connector_iter(connector, &conn_iter) {
1027 : /* Only handle HPD capable connectors. */
1028 0 : if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
1029 0 : continue;
1030 :
1031 0 : if (check_connector_changed(connector)) {
1032 0 : if (!first_changed_connector) {
1033 0 : drm_connector_get(connector);
1034 0 : first_changed_connector = connector;
1035 : }
1036 :
1037 0 : changed++;
1038 : }
1039 : }
1040 0 : drm_connector_list_iter_end(&conn_iter);
1041 0 : mutex_unlock(&dev->mode_config.mutex);
1042 :
1043 0 : if (changed == 1)
1044 0 : drm_kms_helper_connector_hotplug_event(first_changed_connector);
1045 0 : else if (changed > 0)
1046 0 : drm_kms_helper_hotplug_event(dev);
1047 :
1048 0 : if (first_changed_connector)
1049 : drm_connector_put(first_changed_connector);
1050 :
1051 0 : return changed;
1052 : }
1053 : EXPORT_SYMBOL(drm_helper_hpd_irq_event);
1054 :
1055 : /**
1056 : * drm_crtc_helper_mode_valid_fixed - Validates a display mode
1057 : * @crtc: the crtc
1058 : * @mode: the mode to validate
1059 : * @fixed_mode: the display hardware's mode
1060 : *
1061 : * Returns:
1062 : * MODE_OK on success, or another mode-status code otherwise.
1063 : */
1064 0 : enum drm_mode_status drm_crtc_helper_mode_valid_fixed(struct drm_crtc *crtc,
1065 : const struct drm_display_mode *mode,
1066 : const struct drm_display_mode *fixed_mode)
1067 : {
1068 0 : if (mode->hdisplay != fixed_mode->hdisplay && mode->vdisplay != fixed_mode->vdisplay)
1069 : return MODE_ONE_SIZE;
1070 0 : else if (mode->hdisplay != fixed_mode->hdisplay)
1071 : return MODE_ONE_WIDTH;
1072 0 : else if (mode->vdisplay != fixed_mode->vdisplay)
1073 : return MODE_ONE_HEIGHT;
1074 :
1075 0 : return MODE_OK;
1076 : }
1077 : EXPORT_SYMBOL(drm_crtc_helper_mode_valid_fixed);
1078 :
1079 : /**
1080 : * drm_connector_helper_get_modes_from_ddc - Updates the connector's EDID
1081 : * property from the connector's
1082 : * DDC channel
1083 : * @connector: The connector
1084 : *
1085 : * Returns:
1086 : * The number of detected display modes.
1087 : *
1088 : * Uses a connector's DDC channel to retrieve EDID data and update the
1089 : * connector's EDID property and display modes. Drivers can use this
1090 : * function to implement struct &drm_connector_helper_funcs.get_modes
1091 : * for connectors with a DDC channel.
1092 : */
1093 0 : int drm_connector_helper_get_modes_from_ddc(struct drm_connector *connector)
1094 : {
1095 : struct edid *edid;
1096 0 : int count = 0;
1097 :
1098 0 : if (!connector->ddc)
1099 : return 0;
1100 :
1101 0 : edid = drm_get_edid(connector, connector->ddc);
1102 :
1103 : // clears property if EDID is NULL
1104 0 : drm_connector_update_edid_property(connector, edid);
1105 :
1106 0 : if (edid) {
1107 0 : count = drm_add_edid_modes(connector, edid);
1108 0 : kfree(edid);
1109 : }
1110 :
1111 : return count;
1112 : }
1113 : EXPORT_SYMBOL(drm_connector_helper_get_modes_from_ddc);
1114 :
1115 : /**
1116 : * drm_connector_helper_get_modes_fixed - Duplicates a display mode for a connector
1117 : * @connector: the connector
1118 : * @fixed_mode: the display hardware's mode
1119 : *
1120 : * This function duplicates a display modes for a connector. Drivers for hardware
1121 : * that only supports a single fixed mode can use this function in their connector's
1122 : * get_modes helper.
1123 : *
1124 : * Returns:
1125 : * The number of created modes.
1126 : */
1127 0 : int drm_connector_helper_get_modes_fixed(struct drm_connector *connector,
1128 : const struct drm_display_mode *fixed_mode)
1129 : {
1130 0 : struct drm_device *dev = connector->dev;
1131 : struct drm_display_mode *mode;
1132 :
1133 0 : mode = drm_mode_duplicate(dev, fixed_mode);
1134 0 : if (!mode) {
1135 0 : drm_err(dev, "Failed to duplicate mode " DRM_MODE_FMT "\n",
1136 : DRM_MODE_ARG(fixed_mode));
1137 0 : return 0;
1138 : }
1139 :
1140 0 : if (mode->name[0] == '\0')
1141 0 : drm_mode_set_name(mode);
1142 :
1143 0 : mode->type |= DRM_MODE_TYPE_PREFERRED;
1144 0 : drm_mode_probed_add(connector, mode);
1145 :
1146 0 : if (mode->width_mm)
1147 0 : connector->display_info.width_mm = mode->width_mm;
1148 0 : if (mode->height_mm)
1149 0 : connector->display_info.height_mm = mode->height_mm;
1150 :
1151 : return 1;
1152 : }
1153 : EXPORT_SYMBOL(drm_connector_helper_get_modes_fixed);
1154 :
1155 : /**
1156 : * drm_connector_helper_get_modes - Read EDID and update connector.
1157 : * @connector: The connector
1158 : *
1159 : * Read the EDID using drm_edid_read() (which requires that connector->ddc is
1160 : * set), and update the connector using the EDID.
1161 : *
1162 : * This can be used as the "default" connector helper .get_modes() hook if the
1163 : * driver does not need any special processing. This is sets the example what
1164 : * custom .get_modes() hooks should do regarding EDID read and connector update.
1165 : *
1166 : * Returns: Number of modes.
1167 : */
1168 0 : int drm_connector_helper_get_modes(struct drm_connector *connector)
1169 : {
1170 : const struct drm_edid *drm_edid;
1171 : int count;
1172 :
1173 0 : drm_edid = drm_edid_read(connector);
1174 :
1175 : /*
1176 : * Unconditionally update the connector. If the EDID was read
1177 : * successfully, fill in the connector information derived from the
1178 : * EDID. Otherwise, if the EDID is NULL, clear the connector
1179 : * information.
1180 : */
1181 0 : drm_edid_connector_update(connector, drm_edid);
1182 :
1183 0 : count = drm_edid_connector_add_modes(connector);
1184 :
1185 0 : drm_edid_free(drm_edid);
1186 :
1187 0 : return count;
1188 : }
1189 : EXPORT_SYMBOL(drm_connector_helper_get_modes);
1190 :
1191 : /**
1192 : * drm_connector_helper_tv_get_modes - Fills the modes availables to a TV connector
1193 : * @connector: The connector
1194 : *
1195 : * Fills the available modes for a TV connector based on the supported
1196 : * TV modes, and the default mode expressed by the kernel command line.
1197 : *
1198 : * This can be used as the default TV connector helper .get_modes() hook
1199 : * if the driver does not need any special processing.
1200 : *
1201 : * Returns:
1202 : * The number of modes added to the connector.
1203 : */
1204 0 : int drm_connector_helper_tv_get_modes(struct drm_connector *connector)
1205 : {
1206 0 : struct drm_device *dev = connector->dev;
1207 0 : struct drm_property *tv_mode_property =
1208 : dev->mode_config.tv_mode_property;
1209 0 : struct drm_cmdline_mode *cmdline = &connector->cmdline_mode;
1210 0 : unsigned int ntsc_modes = BIT(DRM_MODE_TV_MODE_NTSC) |
1211 : BIT(DRM_MODE_TV_MODE_NTSC_443) |
1212 : BIT(DRM_MODE_TV_MODE_NTSC_J) |
1213 : BIT(DRM_MODE_TV_MODE_PAL_M);
1214 0 : unsigned int pal_modes = BIT(DRM_MODE_TV_MODE_PAL) |
1215 : BIT(DRM_MODE_TV_MODE_PAL_N) |
1216 : BIT(DRM_MODE_TV_MODE_SECAM);
1217 0 : unsigned int tv_modes[2] = { UINT_MAX, UINT_MAX };
1218 0 : unsigned int i, supported_tv_modes = 0;
1219 :
1220 0 : if (!tv_mode_property)
1221 : return 0;
1222 :
1223 0 : for (i = 0; i < tv_mode_property->num_values; i++)
1224 0 : supported_tv_modes |= BIT(tv_mode_property->values[i]);
1225 :
1226 0 : if ((supported_tv_modes & ntsc_modes) &&
1227 0 : (supported_tv_modes & pal_modes)) {
1228 : uint64_t default_mode;
1229 :
1230 0 : if (drm_object_property_get_default_value(&connector->base,
1231 : tv_mode_property,
1232 : &default_mode))
1233 0 : return 0;
1234 :
1235 0 : if (cmdline->tv_mode_specified)
1236 0 : default_mode = cmdline->tv_mode;
1237 :
1238 0 : if (BIT(default_mode) & ntsc_modes) {
1239 0 : tv_modes[0] = DRM_MODE_TV_MODE_NTSC;
1240 0 : tv_modes[1] = DRM_MODE_TV_MODE_PAL;
1241 : } else {
1242 0 : tv_modes[0] = DRM_MODE_TV_MODE_PAL;
1243 0 : tv_modes[1] = DRM_MODE_TV_MODE_NTSC;
1244 : }
1245 0 : } else if (supported_tv_modes & ntsc_modes) {
1246 0 : tv_modes[0] = DRM_MODE_TV_MODE_NTSC;
1247 0 : } else if (supported_tv_modes & pal_modes) {
1248 0 : tv_modes[0] = DRM_MODE_TV_MODE_PAL;
1249 : } else {
1250 : return 0;
1251 : }
1252 :
1253 0 : for (i = 0; i < ARRAY_SIZE(tv_modes); i++) {
1254 : struct drm_display_mode *mode;
1255 :
1256 0 : if (tv_modes[i] == DRM_MODE_TV_MODE_NTSC)
1257 0 : mode = drm_mode_analog_ntsc_480i(dev);
1258 0 : else if (tv_modes[i] == DRM_MODE_TV_MODE_PAL)
1259 0 : mode = drm_mode_analog_pal_576i(dev);
1260 : else
1261 : break;
1262 0 : if (!mode)
1263 0 : return i;
1264 0 : if (!i)
1265 0 : mode->type |= DRM_MODE_TYPE_PREFERRED;
1266 0 : drm_mode_probed_add(connector, mode);
1267 : }
1268 :
1269 0 : return i;
1270 : }
1271 : EXPORT_SYMBOL(drm_connector_helper_tv_get_modes);
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