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_event.h>
37 #include <drm/drm_crtc.h>
38 #include <drm/drm_edid.h>
39 #include <drm/drm_fourcc.h>
40 #include <drm/drm_managed.h>
41 #include <drm/drm_modeset_helper_vtables.h>
42 #include <drm/drm_print.h>
43 #include <drm/drm_probe_helper.h>
44 #include <drm/drm_sysfs.h>
45
46 #include "drm_crtc_helper_internal.h"
47
48 /**
49 * DOC: output probing helper overview
50 *
51 * This library provides some helper code for output probing. It provides an
52 * implementation of the core &drm_connector_funcs.fill_modes interface with
53 * drm_helper_probe_single_connector_modes().
54 *
55 * It also provides support for polling connectors with a work item and for
56 * generic hotplug interrupt handling where the driver doesn't or cannot keep
57 * track of a per-connector hpd interrupt.
58 *
59 * This helper library can be used independently of the modeset helper library.
60 * Drivers can also overwrite different parts e.g. use their own hotplug
61 * handling code to avoid probing unrelated outputs.
62 *
63 * The probe helpers share the function table structures with other display
64 * helper libraries. See &struct drm_connector_helper_funcs for the details.
65 */
66
67 static bool drm_kms_helper_poll = true;
68 module_param_named(poll, drm_kms_helper_poll, bool, 0600);
69
70 static enum drm_mode_status
drm_mode_validate_flag(const struct drm_display_mode * mode,int flags)71 drm_mode_validate_flag(const struct drm_display_mode *mode,
72 int flags)
73 {
74 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
75 !(flags & DRM_MODE_FLAG_INTERLACE))
76 return MODE_NO_INTERLACE;
77
78 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
79 !(flags & DRM_MODE_FLAG_DBLSCAN))
80 return MODE_NO_DBLESCAN;
81
82 if ((mode->flags & DRM_MODE_FLAG_3D_MASK) &&
83 !(flags & DRM_MODE_FLAG_3D_MASK))
84 return MODE_NO_STEREO;
85
86 return MODE_OK;
87 }
88
89 static int
drm_mode_validate_pipeline(struct drm_display_mode * mode,struct drm_connector * connector,struct drm_modeset_acquire_ctx * ctx,enum drm_mode_status * status)90 drm_mode_validate_pipeline(struct drm_display_mode *mode,
91 struct drm_connector *connector,
92 struct drm_modeset_acquire_ctx *ctx,
93 enum drm_mode_status *status)
94 {
95 struct drm_device *dev = connector->dev;
96 struct drm_encoder *encoder;
97 int ret;
98
99 /* Step 1: Validate against connector */
100 ret = drm_connector_mode_valid(connector, mode, ctx, status);
101 if (ret || *status != MODE_OK)
102 return ret;
103
104 /* Step 2: Validate against encoders and crtcs */
105 drm_connector_for_each_possible_encoder(connector, encoder) {
106 struct drm_bridge *bridge;
107 struct drm_crtc *crtc;
108
109 *status = drm_encoder_mode_valid(encoder, mode);
110 if (*status != MODE_OK) {
111 /* No point in continuing for crtc check as this encoder
112 * will not accept the mode anyway. If all encoders
113 * reject the mode then, at exit, ret will not be
114 * MODE_OK. */
115 continue;
116 }
117
118 bridge = drm_bridge_chain_get_first_bridge(encoder);
119 *status = drm_bridge_chain_mode_valid(bridge,
120 &connector->display_info,
121 mode);
122 if (*status != MODE_OK) {
123 /* There is also no point in continuing for crtc check
124 * here. */
125 continue;
126 }
127
128 drm_for_each_crtc(crtc, dev) {
129 if (!drm_encoder_crtc_ok(encoder, crtc))
130 continue;
131
132 *status = drm_crtc_mode_valid(crtc, mode);
133 if (*status == MODE_OK) {
134 /* If we get to this point there is at least
135 * one combination of encoder+crtc that works
136 * for this mode. Lets return now. */
137 return 0;
138 }
139 }
140 }
141
142 return 0;
143 }
144
drm_helper_probe_add_cmdline_mode(struct drm_connector * connector)145 static int drm_helper_probe_add_cmdline_mode(struct drm_connector *connector)
146 {
147 struct drm_cmdline_mode *cmdline_mode;
148 struct drm_display_mode *mode;
149
150 cmdline_mode = &connector->cmdline_mode;
151 if (!cmdline_mode->specified)
152 return 0;
153
154 /* Only add a GTF mode if we find no matching probed modes */
155 list_for_each_entry(mode, &connector->probed_modes, head) {
156 if (mode->hdisplay != cmdline_mode->xres ||
157 mode->vdisplay != cmdline_mode->yres)
158 continue;
159
160 if (cmdline_mode->refresh_specified) {
161 /* The probed mode's vrefresh is set until later */
162 if (drm_mode_vrefresh(mode) != cmdline_mode->refresh)
163 continue;
164 }
165
166 /* Mark the matching mode as being preferred by the user */
167 mode->type |= DRM_MODE_TYPE_USERDEF;
168 return 0;
169 }
170
171 mode = drm_mode_create_from_cmdline_mode(connector->dev,
172 cmdline_mode);
173 if (mode == NULL)
174 return 0;
175
176 drm_mode_probed_add(connector, mode);
177 return 1;
178 }
179
drm_crtc_mode_valid(struct drm_crtc * crtc,const struct drm_display_mode * mode)180 enum drm_mode_status drm_crtc_mode_valid(struct drm_crtc *crtc,
181 const struct drm_display_mode *mode)
182 {
183 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
184
185 if (!crtc_funcs || !crtc_funcs->mode_valid)
186 return MODE_OK;
187
188 return crtc_funcs->mode_valid(crtc, mode);
189 }
190
drm_encoder_mode_valid(struct drm_encoder * encoder,const struct drm_display_mode * mode)191 enum drm_mode_status drm_encoder_mode_valid(struct drm_encoder *encoder,
192 const struct drm_display_mode *mode)
193 {
194 const struct drm_encoder_helper_funcs *encoder_funcs =
195 encoder->helper_private;
196
197 if (!encoder_funcs || !encoder_funcs->mode_valid)
198 return MODE_OK;
199
200 return encoder_funcs->mode_valid(encoder, mode);
201 }
202
203 int
drm_connector_mode_valid(struct drm_connector * connector,const struct drm_display_mode * mode,struct drm_modeset_acquire_ctx * ctx,enum drm_mode_status * status)204 drm_connector_mode_valid(struct drm_connector *connector,
205 const struct drm_display_mode *mode,
206 struct drm_modeset_acquire_ctx *ctx,
207 enum drm_mode_status *status)
208 {
209 const struct drm_connector_helper_funcs *connector_funcs =
210 connector->helper_private;
211 int ret = 0;
212
213 if (!connector_funcs)
214 *status = MODE_OK;
215 else if (connector_funcs->mode_valid_ctx)
216 ret = connector_funcs->mode_valid_ctx(connector, mode, ctx,
217 status);
218 else if (connector_funcs->mode_valid)
219 *status = connector_funcs->mode_valid(connector, mode);
220 else
221 *status = MODE_OK;
222
223 return ret;
224 }
225
drm_kms_helper_disable_hpd(struct drm_device * dev)226 static void drm_kms_helper_disable_hpd(struct drm_device *dev)
227 {
228 struct drm_connector *connector;
229 struct drm_connector_list_iter conn_iter;
230
231 drm_connector_list_iter_begin(dev, &conn_iter);
232 drm_for_each_connector_iter(connector, &conn_iter) {
233 const struct drm_connector_helper_funcs *funcs =
234 connector->helper_private;
235
236 if (funcs && funcs->disable_hpd)
237 funcs->disable_hpd(connector);
238 }
239 drm_connector_list_iter_end(&conn_iter);
240 }
241
drm_kms_helper_enable_hpd(struct drm_device * dev)242 static bool drm_kms_helper_enable_hpd(struct drm_device *dev)
243 {
244 bool poll = false;
245 struct drm_connector *connector;
246 struct drm_connector_list_iter conn_iter;
247
248 drm_connector_list_iter_begin(dev, &conn_iter);
249 drm_for_each_connector_iter(connector, &conn_iter) {
250 const struct drm_connector_helper_funcs *funcs =
251 connector->helper_private;
252
253 if (funcs && funcs->enable_hpd)
254 funcs->enable_hpd(connector);
255
256 if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
257 DRM_CONNECTOR_POLL_DISCONNECT))
258 poll = true;
259 }
260 drm_connector_list_iter_end(&conn_iter);
261
262 return poll;
263 }
264
265 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
reschedule_output_poll_work(struct drm_device * dev)266 static void reschedule_output_poll_work(struct drm_device *dev)
267 {
268 unsigned long delay = DRM_OUTPUT_POLL_PERIOD;
269
270 if (dev->mode_config.delayed_event)
271 /*
272 * FIXME:
273 *
274 * Use short (1s) delay to handle the initial delayed event.
275 * This delay should not be needed, but Optimus/nouveau will
276 * fail in a mysterious way if the delayed event is handled as
277 * soon as possible like it is done in
278 * drm_helper_probe_single_connector_modes() in case the poll
279 * was enabled before.
280 */
281 delay = HZ;
282
283 schedule_delayed_work(&dev->mode_config.output_poll_work, delay);
284 }
285
286 /**
287 * drm_kms_helper_poll_enable - re-enable output polling.
288 * @dev: drm_device
289 *
290 * This function re-enables the output polling work, after it has been
291 * temporarily disabled using drm_kms_helper_poll_disable(), for example over
292 * suspend/resume.
293 *
294 * Drivers can call this helper from their device resume implementation. It is
295 * not an error to call this even when output polling isn't enabled.
296 *
297 * If device polling was never initialized before, this call will trigger a
298 * warning and return.
299 *
300 * Note that calls to enable and disable polling must be strictly ordered, which
301 * is automatically the case when they're only call from suspend/resume
302 * callbacks.
303 */
drm_kms_helper_poll_enable(struct drm_device * dev)304 void drm_kms_helper_poll_enable(struct drm_device *dev)
305 {
306 if (drm_WARN_ON_ONCE(dev, !dev->mode_config.poll_enabled) ||
307 !drm_kms_helper_poll || dev->mode_config.poll_running)
308 return;
309
310 if (drm_kms_helper_enable_hpd(dev) ||
311 dev->mode_config.delayed_event)
312 reschedule_output_poll_work(dev);
313
314 dev->mode_config.poll_running = true;
315 }
316 EXPORT_SYMBOL(drm_kms_helper_poll_enable);
317
318 /**
319 * drm_kms_helper_poll_reschedule - reschedule the output polling work
320 * @dev: drm_device
321 *
322 * This function reschedules the output polling work, after polling for a
323 * connector has been enabled.
324 *
325 * Drivers must call this helper after enabling polling for a connector by
326 * setting %DRM_CONNECTOR_POLL_CONNECT / %DRM_CONNECTOR_POLL_DISCONNECT flags
327 * in drm_connector::polled. Note that after disabling polling by clearing these
328 * flags for a connector will stop the output polling work automatically if
329 * the polling is disabled for all other connectors as well.
330 *
331 * The function can be called only after polling has been enabled by calling
332 * drm_kms_helper_poll_init() / drm_kms_helper_poll_enable().
333 */
drm_kms_helper_poll_reschedule(struct drm_device * dev)334 void drm_kms_helper_poll_reschedule(struct drm_device *dev)
335 {
336 if (dev->mode_config.poll_running)
337 reschedule_output_poll_work(dev);
338 }
339 EXPORT_SYMBOL(drm_kms_helper_poll_reschedule);
340
detect_connector_status(struct drm_connector * connector,struct drm_modeset_acquire_ctx * ctx,bool force)341 static int detect_connector_status(struct drm_connector *connector,
342 struct drm_modeset_acquire_ctx *ctx,
343 bool force)
344 {
345 const struct drm_connector_helper_funcs *funcs = connector->helper_private;
346
347 if (funcs->detect_ctx)
348 return funcs->detect_ctx(connector, ctx, force);
349 else if (connector->funcs->detect)
350 return connector->funcs->detect(connector, force);
351
352 return connector_status_connected;
353 }
354
355 static enum drm_connector_status
drm_helper_probe_detect_ctx(struct drm_connector * connector,bool force)356 drm_helper_probe_detect_ctx(struct drm_connector *connector, bool force)
357 {
358 struct drm_modeset_acquire_ctx ctx;
359 int ret;
360
361 drm_modeset_acquire_init(&ctx, 0);
362
363 retry:
364 ret = drm_modeset_lock(&connector->dev->mode_config.connection_mutex, &ctx);
365 if (!ret)
366 ret = detect_connector_status(connector, &ctx, force);
367
368 if (ret == -EDEADLK) {
369 drm_modeset_backoff(&ctx);
370 goto retry;
371 }
372
373 if (WARN_ON(ret < 0))
374 ret = connector_status_unknown;
375
376 if (ret != connector->status)
377 connector->epoch_counter += 1;
378
379 drm_modeset_drop_locks(&ctx);
380 drm_modeset_acquire_fini(&ctx);
381
382 return ret;
383 }
384
385 /**
386 * drm_helper_probe_detect - probe connector status
387 * @connector: connector to probe
388 * @ctx: acquire_ctx, or NULL to let this function handle locking.
389 * @force: Whether destructive probe operations should be performed.
390 *
391 * This function calls the detect callbacks of the connector.
392 * This function returns &drm_connector_status, or
393 * if @ctx is set, it might also return -EDEADLK.
394 */
395 int
drm_helper_probe_detect(struct drm_connector * connector,struct drm_modeset_acquire_ctx * ctx,bool force)396 drm_helper_probe_detect(struct drm_connector *connector,
397 struct drm_modeset_acquire_ctx *ctx,
398 bool force)
399 {
400 struct drm_device *dev = connector->dev;
401 int ret;
402
403 if (!ctx)
404 return drm_helper_probe_detect_ctx(connector, force);
405
406 ret = drm_modeset_lock(&dev->mode_config.connection_mutex, ctx);
407 if (ret)
408 return ret;
409
410 ret = detect_connector_status(connector, ctx, force);
411
412 if (ret != connector->status)
413 connector->epoch_counter += 1;
414
415 return ret;
416 }
417 EXPORT_SYMBOL(drm_helper_probe_detect);
418
drm_helper_probe_get_modes(struct drm_connector * connector)419 static int drm_helper_probe_get_modes(struct drm_connector *connector)
420 {
421 const struct drm_connector_helper_funcs *connector_funcs =
422 connector->helper_private;
423 int count;
424
425 count = connector_funcs->get_modes(connector);
426
427 /* The .get_modes() callback should not return negative values. */
428 if (count < 0) {
429 drm_err(connector->dev, ".get_modes() returned %pe\n",
430 ERR_PTR(count));
431 count = 0;
432 }
433
434 /*
435 * Fallback for when DDC probe failed in drm_get_edid() and thus skipped
436 * override/firmware EDID.
437 */
438 if (count == 0 && connector->status == connector_status_connected)
439 count = drm_edid_override_connector_update(connector);
440
441 return count;
442 }
443
__drm_helper_update_and_validate(struct drm_connector * connector,uint32_t maxX,uint32_t maxY,struct drm_modeset_acquire_ctx * ctx)444 static int __drm_helper_update_and_validate(struct drm_connector *connector,
445 uint32_t maxX, uint32_t maxY,
446 struct drm_modeset_acquire_ctx *ctx)
447 {
448 struct drm_device *dev = connector->dev;
449 struct drm_display_mode *mode;
450 int mode_flags = 0;
451 int ret;
452
453 drm_connector_list_update(connector);
454
455 if (connector->interlace_allowed)
456 mode_flags |= DRM_MODE_FLAG_INTERLACE;
457 if (connector->doublescan_allowed)
458 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
459 if (connector->stereo_allowed)
460 mode_flags |= DRM_MODE_FLAG_3D_MASK;
461
462 list_for_each_entry(mode, &connector->modes, head) {
463 if (mode->status != MODE_OK)
464 continue;
465
466 mode->status = drm_mode_validate_driver(dev, mode);
467 if (mode->status != MODE_OK)
468 continue;
469
470 mode->status = drm_mode_validate_size(mode, maxX, maxY);
471 if (mode->status != MODE_OK)
472 continue;
473
474 mode->status = drm_mode_validate_flag(mode, mode_flags);
475 if (mode->status != MODE_OK)
476 continue;
477
478 mode->status = drm_mode_validate_ycbcr420(mode, connector);
479 if (mode->status != MODE_OK)
480 continue;
481
482 ret = drm_mode_validate_pipeline(mode, connector, ctx,
483 &mode->status);
484 if (ret) {
485 drm_dbg_kms(dev,
486 "drm_mode_validate_pipeline failed: %d\n",
487 ret);
488
489 if (drm_WARN_ON_ONCE(dev, ret != -EDEADLK))
490 mode->status = MODE_ERROR;
491 else
492 return -EDEADLK;
493 }
494 }
495
496 return 0;
497 }
498
499 /**
500 * drm_helper_probe_single_connector_modes - get complete set of display modes
501 * @connector: connector to probe
502 * @maxX: max width for modes
503 * @maxY: max height for modes
504 *
505 * Based on the helper callbacks implemented by @connector in struct
506 * &drm_connector_helper_funcs try to detect all valid modes. Modes will first
507 * be added to the connector's probed_modes list, then culled (based on validity
508 * and the @maxX, @maxY parameters) and put into the normal modes list.
509 *
510 * Intended to be used as a generic implementation of the
511 * &drm_connector_funcs.fill_modes() vfunc for drivers that use the CRTC helpers
512 * for output mode filtering and detection.
513 *
514 * The basic procedure is as follows
515 *
516 * 1. All modes currently on the connector's modes list are marked as stale
517 *
518 * 2. New modes are added to the connector's probed_modes list with
519 * drm_mode_probed_add(). New modes start their life with status as OK.
520 * Modes are added from a single source using the following priority order.
521 *
522 * - &drm_connector_helper_funcs.get_modes vfunc
523 * - if the connector status is connector_status_connected, standard
524 * VESA DMT modes up to 1024x768 are automatically added
525 * (drm_add_modes_noedid())
526 *
527 * Finally modes specified via the kernel command line (video=...) are
528 * added in addition to what the earlier probes produced
529 * (drm_helper_probe_add_cmdline_mode()). These modes are generated
530 * using the VESA GTF/CVT formulas.
531 *
532 * 3. Modes are moved from the probed_modes list to the modes list. Potential
533 * duplicates are merged together (see drm_connector_list_update()).
534 * After this step the probed_modes list will be empty again.
535 *
536 * 4. Any non-stale mode on the modes list then undergoes validation
537 *
538 * - drm_mode_validate_basic() performs basic sanity checks
539 * - drm_mode_validate_size() filters out modes larger than @maxX and @maxY
540 * (if specified)
541 * - drm_mode_validate_flag() checks the modes against basic connector
542 * capabilities (interlace_allowed,doublescan_allowed,stereo_allowed)
543 * - the optional &drm_connector_helper_funcs.mode_valid or
544 * &drm_connector_helper_funcs.mode_valid_ctx helpers can perform driver
545 * and/or sink specific checks
546 * - the optional &drm_crtc_helper_funcs.mode_valid,
547 * &drm_bridge_funcs.mode_valid and &drm_encoder_helper_funcs.mode_valid
548 * helpers can perform driver and/or source specific checks which are also
549 * enforced by the modeset/atomic helpers
550 *
551 * 5. Any mode whose status is not OK is pruned from the connector's modes list,
552 * accompanied by a debug message indicating the reason for the mode's
553 * rejection (see drm_mode_prune_invalid()).
554 *
555 * Returns:
556 * The number of modes found on @connector.
557 */
drm_helper_probe_single_connector_modes(struct drm_connector * connector,uint32_t maxX,uint32_t maxY)558 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
559 uint32_t maxX, uint32_t maxY)
560 {
561 struct drm_device *dev = connector->dev;
562 struct drm_display_mode *mode;
563 int count = 0, ret;
564 enum drm_connector_status old_status;
565 struct drm_modeset_acquire_ctx ctx;
566
567 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
568
569 drm_modeset_acquire_init(&ctx, 0);
570
571 drm_dbg_kms(dev, "[CONNECTOR:%d:%s]\n", connector->base.id,
572 connector->name);
573
574 retry:
575 ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx);
576 if (ret == -EDEADLK) {
577 drm_modeset_backoff(&ctx);
578 goto retry;
579 } else
580 WARN_ON(ret < 0);
581
582 /* set all old modes to the stale state */
583 list_for_each_entry(mode, &connector->modes, head)
584 mode->status = MODE_STALE;
585
586 old_status = connector->status;
587
588 if (connector->force) {
589 if (connector->force == DRM_FORCE_ON ||
590 connector->force == DRM_FORCE_ON_DIGITAL)
591 connector->status = connector_status_connected;
592 else
593 connector->status = connector_status_disconnected;
594 if (connector->funcs->force)
595 connector->funcs->force(connector);
596 } else {
597 ret = drm_helper_probe_detect(connector, &ctx, true);
598
599 if (ret == -EDEADLK) {
600 drm_modeset_backoff(&ctx);
601 goto retry;
602 } else if (WARN(ret < 0, "Invalid return value %i for connector detection\n", ret))
603 ret = connector_status_unknown;
604
605 connector->status = ret;
606 }
607
608 /*
609 * Normally either the driver's hpd code or the poll loop should
610 * pick up any changes and fire the hotplug event. But if
611 * userspace sneaks in a probe, we might miss a change. Hence
612 * check here, and if anything changed start the hotplug code.
613 */
614 if (old_status != connector->status) {
615 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] status updated from %s to %s\n",
616 connector->base.id, connector->name,
617 drm_get_connector_status_name(old_status),
618 drm_get_connector_status_name(connector->status));
619
620 /*
621 * The hotplug event code might call into the fb
622 * helpers, and so expects that we do not hold any
623 * locks. Fire up the poll struct instead, it will
624 * disable itself again.
625 */
626 dev->mode_config.delayed_event = true;
627 if (dev->mode_config.poll_enabled)
628 mod_delayed_work(system_wq,
629 &dev->mode_config.output_poll_work,
630 0);
631 }
632
633 /*
634 * Re-enable polling in case the global poll config changed but polling
635 * is still initialized.
636 */
637 if (dev->mode_config.poll_enabled)
638 drm_kms_helper_poll_enable(dev);
639
640 if (connector->status == connector_status_disconnected) {
641 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] disconnected\n",
642 connector->base.id, connector->name);
643 drm_connector_update_edid_property(connector, NULL);
644 drm_mode_prune_invalid(dev, &connector->modes, false);
645 goto exit;
646 }
647
648 count = drm_helper_probe_get_modes(connector);
649
650 if (count == 0 && (connector->status == connector_status_connected ||
651 connector->status == connector_status_unknown)) {
652 count = drm_add_modes_noedid(connector, 1024, 768);
653
654 /*
655 * Section 4.2.2.6 (EDID Corruption Detection) of the DP 1.4a
656 * Link CTS specifies that 640x480 (the official "failsafe"
657 * mode) needs to be the default if there's no EDID.
658 */
659 if (connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort)
660 drm_set_preferred_mode(connector, 640, 480);
661 }
662 count += drm_helper_probe_add_cmdline_mode(connector);
663 if (count != 0) {
664 ret = __drm_helper_update_and_validate(connector, maxX, maxY, &ctx);
665 if (ret == -EDEADLK) {
666 drm_modeset_backoff(&ctx);
667 goto retry;
668 }
669 }
670
671 drm_mode_prune_invalid(dev, &connector->modes, true);
672
673 /*
674 * Displayport spec section 5.2.1.2 ("Video Timing Format") says that
675 * all detachable sinks shall support 640x480 @60Hz as a fail safe
676 * mode. If all modes were pruned, perhaps because they need more
677 * lanes or a higher pixel clock than available, at least try to add
678 * in 640x480.
679 */
680 if (list_empty(&connector->modes) &&
681 connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort) {
682 count = drm_add_modes_noedid(connector, 640, 480);
683 ret = __drm_helper_update_and_validate(connector, maxX, maxY, &ctx);
684 if (ret == -EDEADLK) {
685 drm_modeset_backoff(&ctx);
686 goto retry;
687 }
688 drm_mode_prune_invalid(dev, &connector->modes, true);
689 }
690
691 exit:
692 drm_modeset_drop_locks(&ctx);
693 drm_modeset_acquire_fini(&ctx);
694
695 if (list_empty(&connector->modes))
696 return 0;
697
698 drm_mode_sort(&connector->modes);
699
700 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] probed modes:\n",
701 connector->base.id, connector->name);
702
703 list_for_each_entry(mode, &connector->modes, head) {
704 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
705 drm_dbg_kms(dev, "Probed mode: " DRM_MODE_FMT "\n",
706 DRM_MODE_ARG(mode));
707 }
708
709 return count;
710 }
711 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
712
713 /**
714 * drm_kms_helper_hotplug_event - fire off KMS hotplug events
715 * @dev: drm_device whose connector state changed
716 *
717 * This function fires off the uevent for userspace and also calls the
718 * client hotplug function, which is most commonly used to inform the fbdev
719 * emulation code and allow it to update the fbcon output configuration.
720 *
721 * Drivers should call this from their hotplug handling code when a change is
722 * detected. Note that this function does not do any output detection of its
723 * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the
724 * driver already.
725 *
726 * This function must be called from process context with no mode
727 * setting locks held.
728 *
729 * If only a single connector has changed, consider calling
730 * drm_kms_helper_connector_hotplug_event() instead.
731 */
drm_kms_helper_hotplug_event(struct drm_device * dev)732 void drm_kms_helper_hotplug_event(struct drm_device *dev)
733 {
734 drm_sysfs_hotplug_event(dev);
735 drm_client_dev_hotplug(dev);
736 }
737 EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
738
739 /**
740 * drm_kms_helper_connector_hotplug_event - fire off a KMS connector hotplug event
741 * @connector: drm_connector which has changed
742 *
743 * This is the same as drm_kms_helper_hotplug_event(), except it fires a more
744 * fine-grained uevent for a single connector.
745 */
drm_kms_helper_connector_hotplug_event(struct drm_connector * connector)746 void drm_kms_helper_connector_hotplug_event(struct drm_connector *connector)
747 {
748 struct drm_device *dev = connector->dev;
749
750 drm_sysfs_connector_hotplug_event(connector);
751 drm_client_dev_hotplug(dev);
752 }
753 EXPORT_SYMBOL(drm_kms_helper_connector_hotplug_event);
754
output_poll_execute(struct work_struct * work)755 static void output_poll_execute(struct work_struct *work)
756 {
757 struct delayed_work *delayed_work = to_delayed_work(work);
758 struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
759 struct drm_connector *connector;
760 struct drm_connector_list_iter conn_iter;
761 enum drm_connector_status old_status;
762 bool repoll = false, changed;
763 u64 old_epoch_counter;
764
765 if (!dev->mode_config.poll_enabled)
766 return;
767
768 /* Pick up any changes detected by the probe functions. */
769 changed = dev->mode_config.delayed_event;
770 dev->mode_config.delayed_event = false;
771
772 if (!drm_kms_helper_poll) {
773 if (dev->mode_config.poll_running) {
774 drm_kms_helper_disable_hpd(dev);
775 dev->mode_config.poll_running = false;
776 }
777 goto out;
778 }
779
780 if (!mutex_trylock(&dev->mode_config.mutex)) {
781 repoll = true;
782 goto out;
783 }
784
785 drm_connector_list_iter_begin(dev, &conn_iter);
786 drm_for_each_connector_iter(connector, &conn_iter) {
787 /* Ignore forced connectors. */
788 if (connector->force)
789 continue;
790
791 /* Ignore HPD capable connectors and connectors where we don't
792 * want any hotplug detection at all for polling. */
793 if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
794 continue;
795
796 old_status = connector->status;
797 /* if we are connected and don't want to poll for disconnect
798 skip it */
799 if (old_status == connector_status_connected &&
800 !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
801 continue;
802
803 repoll = true;
804
805 old_epoch_counter = connector->epoch_counter;
806 connector->status = drm_helper_probe_detect(connector, NULL, false);
807 if (old_epoch_counter != connector->epoch_counter) {
808 const char *old, *new;
809
810 /*
811 * The poll work sets force=false when calling detect so
812 * that drivers can avoid to do disruptive tests (e.g.
813 * when load detect cycles could cause flickering on
814 * other, running displays). This bears the risk that we
815 * flip-flop between unknown here in the poll work and
816 * the real state when userspace forces a full detect
817 * call after receiving a hotplug event due to this
818 * change.
819 *
820 * Hence clamp an unknown detect status to the old
821 * value.
822 */
823 if (connector->status == connector_status_unknown) {
824 connector->status = old_status;
825 continue;
826 }
827
828 old = drm_get_connector_status_name(old_status);
829 new = drm_get_connector_status_name(connector->status);
830
831 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] status updated from %s to %s\n",
832 connector->base.id, connector->name,
833 old, new);
834 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] epoch counter %llu -> %llu\n",
835 connector->base.id, connector->name,
836 old_epoch_counter, connector->epoch_counter);
837
838 changed = true;
839 }
840 }
841 drm_connector_list_iter_end(&conn_iter);
842
843 mutex_unlock(&dev->mode_config.mutex);
844
845 out:
846 if (changed)
847 drm_kms_helper_hotplug_event(dev);
848
849 if (repoll)
850 schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
851 }
852
853 /**
854 * drm_kms_helper_is_poll_worker - is %current task an output poll worker?
855 *
856 * Determine if %current task is an output poll worker. This can be used
857 * to select distinct code paths for output polling versus other contexts.
858 *
859 * One use case is to avoid a deadlock between the output poll worker and
860 * the autosuspend worker wherein the latter waits for polling to finish
861 * upon calling drm_kms_helper_poll_disable(), while the former waits for
862 * runtime suspend to finish upon calling pm_runtime_get_sync() in a
863 * connector ->detect hook.
864 */
drm_kms_helper_is_poll_worker(void)865 bool drm_kms_helper_is_poll_worker(void)
866 {
867 struct work_struct *work = current_work();
868
869 return work && work->func == output_poll_execute;
870 }
871 EXPORT_SYMBOL(drm_kms_helper_is_poll_worker);
872
873 /**
874 * drm_kms_helper_poll_disable - disable output polling
875 * @dev: drm_device
876 *
877 * This function disables the output polling work.
878 *
879 * Drivers can call this helper from their device suspend implementation. It is
880 * not an error to call this even when output polling isn't enabled or already
881 * disabled. Polling is re-enabled by calling drm_kms_helper_poll_enable().
882 *
883 * If however, the polling was never initialized, this call will trigger a
884 * warning and return.
885 *
886 * Note that calls to enable and disable polling must be strictly ordered, which
887 * is automatically the case when they're only call from suspend/resume
888 * callbacks.
889 */
drm_kms_helper_poll_disable(struct drm_device * dev)890 void drm_kms_helper_poll_disable(struct drm_device *dev)
891 {
892 if (drm_WARN_ON(dev, !dev->mode_config.poll_enabled))
893 return;
894
895 if (dev->mode_config.poll_running)
896 drm_kms_helper_disable_hpd(dev);
897
898 cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
899
900 dev->mode_config.poll_running = false;
901 }
902 EXPORT_SYMBOL(drm_kms_helper_poll_disable);
903
904 /**
905 * drm_kms_helper_poll_init - initialize and enable output polling
906 * @dev: drm_device
907 *
908 * This function initializes and then also enables output polling support for
909 * @dev. Drivers which do not have reliable hotplug support in hardware can use
910 * this helper infrastructure to regularly poll such connectors for changes in
911 * their connection state.
912 *
913 * Drivers can control which connectors are polled by setting the
914 * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On
915 * connectors where probing live outputs can result in visual distortion drivers
916 * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this.
917 * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are
918 * completely ignored by the polling logic.
919 *
920 * Note that a connector can be both polled and probed from the hotplug handler,
921 * in case the hotplug interrupt is known to be unreliable.
922 */
drm_kms_helper_poll_init(struct drm_device * dev)923 void drm_kms_helper_poll_init(struct drm_device *dev)
924 {
925 INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
926 dev->mode_config.poll_enabled = true;
927
928 drm_kms_helper_poll_enable(dev);
929 }
930 EXPORT_SYMBOL(drm_kms_helper_poll_init);
931
932 /**
933 * drm_kms_helper_poll_fini - disable output polling and clean it up
934 * @dev: drm_device
935 */
drm_kms_helper_poll_fini(struct drm_device * dev)936 void drm_kms_helper_poll_fini(struct drm_device *dev)
937 {
938 if (!dev->mode_config.poll_enabled)
939 return;
940
941 drm_kms_helper_poll_disable(dev);
942
943 dev->mode_config.poll_enabled = false;
944 }
945 EXPORT_SYMBOL(drm_kms_helper_poll_fini);
946
drm_kms_helper_poll_init_release(struct drm_device * dev,void * res)947 static void drm_kms_helper_poll_init_release(struct drm_device *dev, void *res)
948 {
949 drm_kms_helper_poll_fini(dev);
950 }
951
952 /**
953 * drmm_kms_helper_poll_init - initialize and enable output polling
954 * @dev: drm_device
955 *
956 * This function initializes and then also enables output polling support for
957 * @dev similar to drm_kms_helper_poll_init(). Polling will automatically be
958 * cleaned up when the DRM device goes away.
959 *
960 * See drm_kms_helper_poll_init() for more information.
961 *
962 * Returns:
963 * 0 on success, or a negative errno code otherwise.
964 */
drmm_kms_helper_poll_init(struct drm_device * dev)965 int drmm_kms_helper_poll_init(struct drm_device *dev)
966 {
967 drm_kms_helper_poll_init(dev);
968
969 return drmm_add_action_or_reset(dev, drm_kms_helper_poll_init_release, dev);
970 }
971 EXPORT_SYMBOL(drmm_kms_helper_poll_init);
972
check_connector_changed(struct drm_connector * connector)973 static bool check_connector_changed(struct drm_connector *connector)
974 {
975 struct drm_device *dev = connector->dev;
976 enum drm_connector_status old_status;
977 u64 old_epoch_counter;
978
979 /* Only handle HPD capable connectors. */
980 drm_WARN_ON(dev, !(connector->polled & DRM_CONNECTOR_POLL_HPD));
981
982 drm_WARN_ON(dev, !mutex_is_locked(&dev->mode_config.mutex));
983
984 old_status = connector->status;
985 old_epoch_counter = connector->epoch_counter;
986 connector->status = drm_helper_probe_detect(connector, NULL, false);
987
988 if (old_epoch_counter == connector->epoch_counter) {
989 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Same epoch counter %llu\n",
990 connector->base.id,
991 connector->name,
992 connector->epoch_counter);
993
994 return false;
995 }
996
997 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] status updated from %s to %s\n",
998 connector->base.id,
999 connector->name,
1000 drm_get_connector_status_name(old_status),
1001 drm_get_connector_status_name(connector->status));
1002
1003 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Changed epoch counter %llu => %llu\n",
1004 connector->base.id,
1005 connector->name,
1006 old_epoch_counter,
1007 connector->epoch_counter);
1008
1009 return true;
1010 }
1011
1012 /**
1013 * drm_connector_helper_hpd_irq_event - hotplug processing
1014 * @connector: drm_connector
1015 *
1016 * Drivers can use this helper function to run a detect cycle on a connector
1017 * which has the DRM_CONNECTOR_POLL_HPD flag set in its &polled member.
1018 *
1019 * This helper function is useful for drivers which can track hotplug
1020 * interrupts for a single connector. Drivers that want to send a
1021 * hotplug event for all connectors or can't track hotplug interrupts
1022 * per connector need to use drm_helper_hpd_irq_event().
1023 *
1024 * This function must be called from process context with no mode
1025 * setting locks held.
1026 *
1027 * Note that a connector can be both polled and probed from the hotplug
1028 * handler, in case the hotplug interrupt is known to be unreliable.
1029 *
1030 * Returns:
1031 * A boolean indicating whether the connector status changed or not
1032 */
drm_connector_helper_hpd_irq_event(struct drm_connector * connector)1033 bool drm_connector_helper_hpd_irq_event(struct drm_connector *connector)
1034 {
1035 struct drm_device *dev = connector->dev;
1036 bool changed;
1037
1038 mutex_lock(&dev->mode_config.mutex);
1039 changed = check_connector_changed(connector);
1040 mutex_unlock(&dev->mode_config.mutex);
1041
1042 if (changed) {
1043 drm_kms_helper_connector_hotplug_event(connector);
1044 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Sent hotplug event\n",
1045 connector->base.id,
1046 connector->name);
1047 }
1048
1049 return changed;
1050 }
1051 EXPORT_SYMBOL(drm_connector_helper_hpd_irq_event);
1052
1053 /**
1054 * drm_helper_hpd_irq_event - hotplug processing
1055 * @dev: drm_device
1056 *
1057 * Drivers can use this helper function to run a detect cycle on all connectors
1058 * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All
1059 * other connectors are ignored, which is useful to avoid reprobing fixed
1060 * panels.
1061 *
1062 * This helper function is useful for drivers which can't or don't track hotplug
1063 * interrupts for each connector.
1064 *
1065 * Drivers which support hotplug interrupts for each connector individually and
1066 * which have a more fine-grained detect logic can use
1067 * drm_connector_helper_hpd_irq_event(). Alternatively, they should bypass this
1068 * code and directly call drm_kms_helper_hotplug_event() in case the connector
1069 * state changed.
1070 *
1071 * This function must be called from process context with no mode
1072 * setting locks held.
1073 *
1074 * Note that a connector can be both polled and probed from the hotplug handler,
1075 * in case the hotplug interrupt is known to be unreliable.
1076 *
1077 * Returns:
1078 * A boolean indicating whether the connector status changed or not
1079 */
drm_helper_hpd_irq_event(struct drm_device * dev)1080 bool drm_helper_hpd_irq_event(struct drm_device *dev)
1081 {
1082 struct drm_connector *connector, *first_changed_connector = NULL;
1083 struct drm_connector_list_iter conn_iter;
1084 int changed = 0;
1085
1086 if (!dev->mode_config.poll_enabled)
1087 return false;
1088
1089 mutex_lock(&dev->mode_config.mutex);
1090 drm_connector_list_iter_begin(dev, &conn_iter);
1091 drm_for_each_connector_iter(connector, &conn_iter) {
1092 /* Only handle HPD capable connectors. */
1093 if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
1094 continue;
1095
1096 if (check_connector_changed(connector)) {
1097 if (!first_changed_connector) {
1098 drm_connector_get(connector);
1099 first_changed_connector = connector;
1100 }
1101
1102 changed++;
1103 }
1104 }
1105 drm_connector_list_iter_end(&conn_iter);
1106 mutex_unlock(&dev->mode_config.mutex);
1107
1108 if (changed == 1)
1109 drm_kms_helper_connector_hotplug_event(first_changed_connector);
1110 else if (changed > 0)
1111 drm_kms_helper_hotplug_event(dev);
1112
1113 if (first_changed_connector)
1114 drm_connector_put(first_changed_connector);
1115
1116 return changed;
1117 }
1118 EXPORT_SYMBOL(drm_helper_hpd_irq_event);
1119
1120 /**
1121 * drm_crtc_helper_mode_valid_fixed - Validates a display mode
1122 * @crtc: the crtc
1123 * @mode: the mode to validate
1124 * @fixed_mode: the display hardware's mode
1125 *
1126 * Returns:
1127 * MODE_OK on success, or another mode-status code otherwise.
1128 */
drm_crtc_helper_mode_valid_fixed(struct drm_crtc * crtc,const struct drm_display_mode * mode,const struct drm_display_mode * fixed_mode)1129 enum drm_mode_status drm_crtc_helper_mode_valid_fixed(struct drm_crtc *crtc,
1130 const struct drm_display_mode *mode,
1131 const struct drm_display_mode *fixed_mode)
1132 {
1133 if (mode->hdisplay != fixed_mode->hdisplay && mode->vdisplay != fixed_mode->vdisplay)
1134 return MODE_ONE_SIZE;
1135 else if (mode->hdisplay != fixed_mode->hdisplay)
1136 return MODE_ONE_WIDTH;
1137 else if (mode->vdisplay != fixed_mode->vdisplay)
1138 return MODE_ONE_HEIGHT;
1139
1140 return MODE_OK;
1141 }
1142 EXPORT_SYMBOL(drm_crtc_helper_mode_valid_fixed);
1143
1144 /**
1145 * drm_connector_helper_get_modes_fixed - Duplicates a display mode for a connector
1146 * @connector: the connector
1147 * @fixed_mode: the display hardware's mode
1148 *
1149 * This function duplicates a display modes for a connector. Drivers for hardware
1150 * that only supports a single fixed mode can use this function in their connector's
1151 * get_modes helper.
1152 *
1153 * Returns:
1154 * The number of created modes.
1155 */
drm_connector_helper_get_modes_fixed(struct drm_connector * connector,const struct drm_display_mode * fixed_mode)1156 int drm_connector_helper_get_modes_fixed(struct drm_connector *connector,
1157 const struct drm_display_mode *fixed_mode)
1158 {
1159 struct drm_device *dev = connector->dev;
1160 struct drm_display_mode *mode;
1161
1162 mode = drm_mode_duplicate(dev, fixed_mode);
1163 if (!mode) {
1164 drm_err(dev, "Failed to duplicate mode " DRM_MODE_FMT "\n",
1165 DRM_MODE_ARG(fixed_mode));
1166 return 0;
1167 }
1168
1169 if (mode->name[0] == '\0')
1170 drm_mode_set_name(mode);
1171
1172 mode->type |= DRM_MODE_TYPE_PREFERRED;
1173 drm_mode_probed_add(connector, mode);
1174
1175 if (mode->width_mm)
1176 connector->display_info.width_mm = mode->width_mm;
1177 if (mode->height_mm)
1178 connector->display_info.height_mm = mode->height_mm;
1179
1180 return 1;
1181 }
1182 EXPORT_SYMBOL(drm_connector_helper_get_modes_fixed);
1183
1184 /**
1185 * drm_connector_helper_get_modes - Read EDID and update connector.
1186 * @connector: The connector
1187 *
1188 * Read the EDID using drm_edid_read() (which requires that connector->ddc is
1189 * set), and update the connector using the EDID.
1190 *
1191 * This can be used as the "default" connector helper .get_modes() hook if the
1192 * driver does not need any special processing. This is sets the example what
1193 * custom .get_modes() hooks should do regarding EDID read and connector update.
1194 *
1195 * Returns: Number of modes.
1196 */
drm_connector_helper_get_modes(struct drm_connector * connector)1197 int drm_connector_helper_get_modes(struct drm_connector *connector)
1198 {
1199 const struct drm_edid *drm_edid;
1200 int count;
1201
1202 drm_edid = drm_edid_read(connector);
1203
1204 /*
1205 * Unconditionally update the connector. If the EDID was read
1206 * successfully, fill in the connector information derived from the
1207 * EDID. Otherwise, if the EDID is NULL, clear the connector
1208 * information.
1209 */
1210 drm_edid_connector_update(connector, drm_edid);
1211
1212 count = drm_edid_connector_add_modes(connector);
1213
1214 drm_edid_free(drm_edid);
1215
1216 return count;
1217 }
1218 EXPORT_SYMBOL(drm_connector_helper_get_modes);
1219
1220 /**
1221 * drm_connector_helper_tv_get_modes - Fills the modes availables to a TV connector
1222 * @connector: The connector
1223 *
1224 * Fills the available modes for a TV connector based on the supported
1225 * TV modes, and the default mode expressed by the kernel command line.
1226 *
1227 * This can be used as the default TV connector helper .get_modes() hook
1228 * if the driver does not need any special processing.
1229 *
1230 * Returns:
1231 * The number of modes added to the connector.
1232 */
drm_connector_helper_tv_get_modes(struct drm_connector * connector)1233 int drm_connector_helper_tv_get_modes(struct drm_connector *connector)
1234 {
1235 struct drm_device *dev = connector->dev;
1236 struct drm_property *tv_mode_property =
1237 dev->mode_config.tv_mode_property;
1238 struct drm_cmdline_mode *cmdline = &connector->cmdline_mode;
1239 unsigned int ntsc_modes = BIT(DRM_MODE_TV_MODE_NTSC) |
1240 BIT(DRM_MODE_TV_MODE_NTSC_443) |
1241 BIT(DRM_MODE_TV_MODE_NTSC_J) |
1242 BIT(DRM_MODE_TV_MODE_PAL_M);
1243 unsigned int pal_modes = BIT(DRM_MODE_TV_MODE_PAL) |
1244 BIT(DRM_MODE_TV_MODE_PAL_N) |
1245 BIT(DRM_MODE_TV_MODE_SECAM);
1246 unsigned int tv_modes[2] = { UINT_MAX, UINT_MAX };
1247 unsigned int i, supported_tv_modes = 0;
1248
1249 if (!tv_mode_property)
1250 return 0;
1251
1252 for (i = 0; i < tv_mode_property->num_values; i++)
1253 supported_tv_modes |= BIT(tv_mode_property->values[i]);
1254
1255 if (((supported_tv_modes & ntsc_modes) &&
1256 (supported_tv_modes & pal_modes)) ||
1257 (supported_tv_modes & BIT(DRM_MODE_TV_MODE_MONOCHROME))) {
1258 uint64_t default_mode;
1259
1260 if (drm_object_property_get_default_value(&connector->base,
1261 tv_mode_property,
1262 &default_mode))
1263 return 0;
1264
1265 if (cmdline->tv_mode_specified)
1266 default_mode = cmdline->tv_mode;
1267
1268 if (BIT(default_mode) & ntsc_modes) {
1269 tv_modes[0] = DRM_MODE_TV_MODE_NTSC;
1270 tv_modes[1] = DRM_MODE_TV_MODE_PAL;
1271 } else {
1272 tv_modes[0] = DRM_MODE_TV_MODE_PAL;
1273 tv_modes[1] = DRM_MODE_TV_MODE_NTSC;
1274 }
1275 } else if (supported_tv_modes & ntsc_modes) {
1276 tv_modes[0] = DRM_MODE_TV_MODE_NTSC;
1277 } else if (supported_tv_modes & pal_modes) {
1278 tv_modes[0] = DRM_MODE_TV_MODE_PAL;
1279 } else {
1280 return 0;
1281 }
1282
1283 for (i = 0; i < ARRAY_SIZE(tv_modes); i++) {
1284 struct drm_display_mode *mode;
1285
1286 if (tv_modes[i] == DRM_MODE_TV_MODE_NTSC)
1287 mode = drm_mode_analog_ntsc_480i(dev);
1288 else if (tv_modes[i] == DRM_MODE_TV_MODE_PAL)
1289 mode = drm_mode_analog_pal_576i(dev);
1290 else
1291 break;
1292 if (!mode)
1293 return i;
1294 if (!i)
1295 mode->type |= DRM_MODE_TYPE_PREFERRED;
1296 drm_mode_probed_add(connector, mode);
1297 }
1298
1299 return i;
1300 }
1301 EXPORT_SYMBOL(drm_connector_helper_tv_get_modes);
1302
1303 /**
1304 * drm_connector_helper_detect_from_ddc - Read EDID and detect connector status.
1305 * @connector: The connector
1306 * @ctx: Acquire context
1307 * @force: Perform screen-destructive operations, if necessary
1308 *
1309 * Detects the connector status by reading the EDID using drm_probe_ddc(),
1310 * which requires connector->ddc to be set. Returns connector_status_connected
1311 * on success or connector_status_disconnected on failure.
1312 *
1313 * Returns:
1314 * The connector status as defined by enum drm_connector_status.
1315 */
drm_connector_helper_detect_from_ddc(struct drm_connector * connector,struct drm_modeset_acquire_ctx * ctx,bool force)1316 int drm_connector_helper_detect_from_ddc(struct drm_connector *connector,
1317 struct drm_modeset_acquire_ctx *ctx,
1318 bool force)
1319 {
1320 struct i2c_adapter *ddc = connector->ddc;
1321
1322 if (!ddc)
1323 return connector_status_unknown;
1324
1325 if (drm_probe_ddc(ddc))
1326 return connector_status_connected;
1327
1328 return connector_status_disconnected;
1329 }
1330 EXPORT_SYMBOL(drm_connector_helper_detect_from_ddc);
1331