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1/*
2 * Copyright (c) 2006-2008 Intel Corporation
3 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
4 *
5 * DRM core CRTC related functions
6 *
7 * Permission to use, copy, modify, distribute, and sell this software and its
8 * documentation for any purpose is hereby granted without fee, provided that
9 * the above copyright notice appear in all copies and that both that copyright
10 * notice and this permission notice appear in supporting documentation, and
11 * that the name of the copyright holders not be used in advertising or
12 * publicity pertaining to distribution of the software without specific,
13 * written prior permission. The copyright holders make no representations
14 * about the suitability of this software for any purpose. It is provided "as
15 * is" without express or implied warranty.
16 *
17 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
19 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
20 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
21 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
22 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
23 * OF THIS SOFTWARE.
24 *
25 * Authors:
26 * Keith Packard
27 * Eric Anholt <eric@anholt.net>
28 * Dave Airlie <airlied@linux.ie>
29 * Jesse Barnes <jesse.barnes@intel.com>
30 */
31
32#include <linux/export.h>
33#include <linux/moduleparam.h>
34
35#include <drm/drmP.h>
36#include <drm/drm_crtc.h>
37#include <drm/drm_fourcc.h>
38#include <drm/drm_crtc_helper.h>
39#include <drm/drm_fb_helper.h>
40#include <drm/drm_edid.h>
41
42/**
43 * DOC: output probing helper overview
44 *
45 * This library provides some helper code for output probing. It provides an
46 * implementation of the core connector->fill_modes interface with
47 * drm_helper_probe_single_connector_modes.
48 *
49 * It also provides support for polling connectors with a work item and for
50 * generic hotplug interrupt handling where the driver doesn't or cannot keep
51 * track of a per-connector hpd interrupt.
52 *
53 * This helper library can be used independently of the modeset helper library.
54 * Drivers can also overwrite different parts e.g. use their own hotplug
55 * handling code to avoid probing unrelated outputs.
56 *
57 * The probe helpers share the function table structures with other display
58 * helper libraries. See struct &drm_connector_helper_funcs for the details.
59 */
60
61static bool drm_kms_helper_poll = true;
62module_param_named(poll, drm_kms_helper_poll, bool, 0600);
63
64static enum drm_mode_status
65drm_mode_validate_flag(const struct drm_display_mode *mode,
66 int flags)
67{
68 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
69 !(flags & DRM_MODE_FLAG_INTERLACE))
70 return MODE_NO_INTERLACE;
71
72 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
73 !(flags & DRM_MODE_FLAG_DBLSCAN))
74 return MODE_NO_DBLESCAN;
75
76 if ((mode->flags & DRM_MODE_FLAG_3D_MASK) &&
77 !(flags & DRM_MODE_FLAG_3D_MASK))
78 return MODE_NO_STEREO;
79
80 return MODE_OK;
81}
82
83static int drm_helper_probe_add_cmdline_mode(struct drm_connector *connector)
84{
85 struct drm_display_mode *mode;
86
87 if (!connector->cmdline_mode.specified)
88 return 0;
89
90 mode = drm_mode_create_from_cmdline_mode(connector->dev,
91 &connector->cmdline_mode);
92 if (mode == NULL)
93 return 0;
94
95 drm_mode_probed_add(connector, mode);
96 return 1;
97}
98
99#define DRM_OUTPUT_POLL_PERIOD (10*HZ)
100/**
101 * drm_kms_helper_poll_enable_locked - re-enable output polling.
102 * @dev: drm_device
103 *
104 * This function re-enables the output polling work without
105 * locking the mode_config mutex.
106 *
107 * This is like drm_kms_helper_poll_enable() however it is to be
108 * called from a context where the mode_config mutex is locked
109 * already.
110 */
111void drm_kms_helper_poll_enable_locked(struct drm_device *dev)
112{
113 bool poll = false;
114 struct drm_connector *connector;
115
116 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
117
118 if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
119 return;
120
121 drm_for_each_connector(connector, dev) {
122 if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
123 DRM_CONNECTOR_POLL_DISCONNECT))
124 poll = true;
125 }
126
127 if (poll)
128 schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
129}
130EXPORT_SYMBOL(drm_kms_helper_poll_enable_locked);
131
132/**
133 * drm_helper_probe_single_connector_modes - get complete set of display modes
134 * @connector: connector to probe
135 * @maxX: max width for modes
136 * @maxY: max height for modes
137 *
138 * Based on the helper callbacks implemented by @connector in struct
139 * &drm_connector_helper_funcs try to detect all valid modes. Modes will first
140 * be added to the connector's probed_modes list, then culled (based on validity
141 * and the @maxX, @maxY parameters) and put into the normal modes list.
142 *
143 * Intended to be used as a generic implementation of the ->fill_modes()
144 * @connector vfunc for drivers that use the CRTC helpers for output mode
145 * filtering and detection.
146 *
147 * The basic procedure is as follows
148 *
149 * 1. All modes currently on the connector's modes list are marked as stale
150 *
151 * 2. New modes are added to the connector's probed_modes list with
152 * drm_mode_probed_add(). New modes start their life with status as OK.
153 * Modes are added from a single source using the following priority order.
154 *
155 * - debugfs 'override_edid' (used for testing only)
156 * - firmware EDID (drm_load_edid_firmware())
157 * - connector helper ->get_modes() vfunc
158 * - if the connector status is connector_status_connected, standard
159 * VESA DMT modes up to 1024x768 are automatically added
160 * (drm_add_modes_noedid())
161 *
162 * Finally modes specified via the kernel command line (video=...) are
163 * added in addition to what the earlier probes produced
164 * (drm_helper_probe_add_cmdline_mode()). These modes are generated
165 * using the VESA GTF/CVT formulas.
166 *
167 * 3. Modes are moved from the probed_modes list to the modes list. Potential
168 * duplicates are merged together (see drm_mode_connector_list_update()).
169 * After this step the probed_modes list will be empty again.
170 *
171 * 4. Any non-stale mode on the modes list then undergoes validation
172 *
173 * - drm_mode_validate_basic() performs basic sanity checks
174 * - drm_mode_validate_size() filters out modes larger than @maxX and @maxY
175 * (if specified)
176 * - drm_mode_validate_flag() checks the modes againt basic connector
177 * capabilites (interlace_allowed,doublescan_allowed,stereo_allowed)
178 * - the optional connector ->mode_valid() helper can perform driver and/or
179 * hardware specific checks
180 *
181 * 5. Any mode whose status is not OK is pruned from the connector's modes list,
182 * accompanied by a debug message indicating the reason for the mode's
183 * rejection (see drm_mode_prune_invalid()).
184 *
185 * Returns:
186 * The number of modes found on @connector.
187 */
188int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
189 uint32_t maxX, uint32_t maxY)
190{
191 struct drm_device *dev = connector->dev;
192 struct drm_display_mode *mode;
193 const struct drm_connector_helper_funcs *connector_funcs =
194 connector->helper_private;
195 int count = 0;
196 int mode_flags = 0;
197 bool verbose_prune = true;
198 enum drm_connector_status old_status;
199
200 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
201
202 DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
203 connector->name);
204 /* set all old modes to the stale state */
205 list_for_each_entry(mode, &connector->modes, head)
206 mode->status = MODE_STALE;
207
208 old_status = connector->status;
209
210 if (connector->force) {
211 if (connector->force == DRM_FORCE_ON ||
212 connector->force == DRM_FORCE_ON_DIGITAL)
213 connector->status = connector_status_connected;
214 else
215 connector->status = connector_status_disconnected;
216 if (connector->funcs->force)
217 connector->funcs->force(connector);
218 } else {
219 connector->status = connector->funcs->detect(connector, true);
220 }
221
222 /*
223 * Normally either the driver's hpd code or the poll loop should
224 * pick up any changes and fire the hotplug event. But if
225 * userspace sneaks in a probe, we might miss a change. Hence
226 * check here, and if anything changed start the hotplug code.
227 */
228 if (old_status != connector->status) {
229 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
230 connector->base.id,
231 connector->name,
232 drm_get_connector_status_name(old_status),
233 drm_get_connector_status_name(connector->status));
234
235 /*
236 * The hotplug event code might call into the fb
237 * helpers, and so expects that we do not hold any
238 * locks. Fire up the poll struct instead, it will
239 * disable itself again.
240 */
241 dev->mode_config.delayed_event = true;
242 if (dev->mode_config.poll_enabled)
243 schedule_delayed_work(&dev->mode_config.output_poll_work,
244 0);
245 }
246
247 /* Re-enable polling in case the global poll config changed. */
248 if (drm_kms_helper_poll != dev->mode_config.poll_running)
249 drm_kms_helper_poll_enable_locked(dev);
250
251 dev->mode_config.poll_running = drm_kms_helper_poll;
252
253 if (connector->status == connector_status_disconnected) {
254 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
255 connector->base.id, connector->name);
256 drm_mode_connector_update_edid_property(connector, NULL);
257 verbose_prune = false;
258 goto prune;
259 }
260
261 if (connector->override_edid) {
262 struct edid *edid = (struct edid *) connector->edid_blob_ptr->data;
263
264 count = drm_add_edid_modes(connector, edid);
265 drm_edid_to_eld(connector, edid);
266 } else {
267#ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
268 count = drm_load_edid_firmware(connector);
269 if (count == 0)
270#endif
271 count = (*connector_funcs->get_modes)(connector);
272 }
273
274 if (count == 0 && connector->status == connector_status_connected)
275 count = drm_add_modes_noedid(connector, 1024, 768);
276 count += drm_helper_probe_add_cmdline_mode(connector);
277 if (count == 0)
278 goto prune;
279
280 drm_mode_connector_list_update(connector);
281
282 if (connector->interlace_allowed)
283 mode_flags |= DRM_MODE_FLAG_INTERLACE;
284 if (connector->doublescan_allowed)
285 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
286 if (connector->stereo_allowed)
287 mode_flags |= DRM_MODE_FLAG_3D_MASK;
288
289 list_for_each_entry(mode, &connector->modes, head) {
290 if (mode->status == MODE_OK)
291 mode->status = drm_mode_validate_basic(mode);
292
293 if (mode->status == MODE_OK)
294 mode->status = drm_mode_validate_size(mode, maxX, maxY);
295
296 if (mode->status == MODE_OK)
297 mode->status = drm_mode_validate_flag(mode, mode_flags);
298
299 if (mode->status == MODE_OK && connector_funcs->mode_valid)
300 mode->status = connector_funcs->mode_valid(connector,
301 mode);
302 }
303
304prune:
305 drm_mode_prune_invalid(dev, &connector->modes, verbose_prune);
306
307 if (list_empty(&connector->modes))
308 return 0;
309
310 list_for_each_entry(mode, &connector->modes, head)
311 mode->vrefresh = drm_mode_vrefresh(mode);
312
313 drm_mode_sort(&connector->modes);
314
315 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
316 connector->name);
317 list_for_each_entry(mode, &connector->modes, head) {
318 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
319 drm_mode_debug_printmodeline(mode);
320 }
321
322 return count;
323}
324EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
325
326/**
327 * drm_kms_helper_hotplug_event - fire off KMS hotplug events
328 * @dev: drm_device whose connector state changed
329 *
330 * This function fires off the uevent for userspace and also calls the
331 * output_poll_changed function, which is most commonly used to inform the fbdev
332 * emulation code and allow it to update the fbcon output configuration.
333 *
334 * Drivers should call this from their hotplug handling code when a change is
335 * detected. Note that this function does not do any output detection of its
336 * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the
337 * driver already.
338 *
339 * This function must be called from process context with no mode
340 * setting locks held.
341 */
342void drm_kms_helper_hotplug_event(struct drm_device *dev)
343{
344 /* send a uevent + call fbdev */
345 drm_sysfs_hotplug_event(dev);
346 if (dev->mode_config.funcs->output_poll_changed)
347 dev->mode_config.funcs->output_poll_changed(dev);
348}
349EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
350
351static void output_poll_execute(struct work_struct *work)
352{
353 struct delayed_work *delayed_work = to_delayed_work(work);
354 struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
355 struct drm_connector *connector;
356 enum drm_connector_status old_status;
357 bool repoll = false, changed;
358
359 /* Pick up any changes detected by the probe functions. */
360 changed = dev->mode_config.delayed_event;
361 dev->mode_config.delayed_event = false;
362
363 if (!drm_kms_helper_poll)
364 goto out;
365
366 mutex_lock(&dev->mode_config.mutex);
367 drm_for_each_connector(connector, dev) {
368
369 /* Ignore forced connectors. */
370 if (connector->force)
371 continue;
372
373 /* Ignore HPD capable connectors and connectors where we don't
374 * want any hotplug detection at all for polling. */
375 if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
376 continue;
377
378 old_status = connector->status;
379 /* if we are connected and don't want to poll for disconnect
380 skip it */
381 if (old_status == connector_status_connected &&
382 !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
383 continue;
384
385 repoll = true;
386
387 connector->status = connector->funcs->detect(connector, false);
388 if (old_status != connector->status) {
389 const char *old, *new;
390
391 /*
392 * The poll work sets force=false when calling detect so
393 * that drivers can avoid to do disruptive tests (e.g.
394 * when load detect cycles could cause flickering on
395 * other, running displays). This bears the risk that we
396 * flip-flop between unknown here in the poll work and
397 * the real state when userspace forces a full detect
398 * call after receiving a hotplug event due to this
399 * change.
400 *
401 * Hence clamp an unknown detect status to the old
402 * value.
403 */
404 if (connector->status == connector_status_unknown) {
405 connector->status = old_status;
406 continue;
407 }
408
409 old = drm_get_connector_status_name(old_status);
410 new = drm_get_connector_status_name(connector->status);
411
412 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
413 "status updated from %s to %s\n",
414 connector->base.id,
415 connector->name,
416 old, new);
417
418 changed = true;
419 }
420 }
421
422 mutex_unlock(&dev->mode_config.mutex);
423
424out:
425 if (changed)
426 drm_kms_helper_hotplug_event(dev);
427
428 if (repoll)
429 schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
430}
431
432/**
433 * drm_kms_helper_poll_disable - disable output polling
434 * @dev: drm_device
435 *
436 * This function disables the output polling work.
437 *
438 * Drivers can call this helper from their device suspend implementation. It is
439 * not an error to call this even when output polling isn't enabled or arlready
440 * disabled.
441 */
442void drm_kms_helper_poll_disable(struct drm_device *dev)
443{
444 if (!dev->mode_config.poll_enabled)
445 return;
446 cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
447}
448EXPORT_SYMBOL(drm_kms_helper_poll_disable);
449
450/**
451 * drm_kms_helper_poll_enable - re-enable output polling.
452 * @dev: drm_device
453 *
454 * This function re-enables the output polling work.
455 *
456 * Drivers can call this helper from their device resume implementation. It is
457 * an error to call this when the output polling support has not yet been set
458 * up.
459 */
460void drm_kms_helper_poll_enable(struct drm_device *dev)
461{
462 mutex_lock(&dev->mode_config.mutex);
463 drm_kms_helper_poll_enable_locked(dev);
464 mutex_unlock(&dev->mode_config.mutex);
465}
466EXPORT_SYMBOL(drm_kms_helper_poll_enable);
467
468/**
469 * drm_kms_helper_poll_init - initialize and enable output polling
470 * @dev: drm_device
471 *
472 * This function intializes and then also enables output polling support for
473 * @dev. Drivers which do not have reliable hotplug support in hardware can use
474 * this helper infrastructure to regularly poll such connectors for changes in
475 * their connection state.
476 *
477 * Drivers can control which connectors are polled by setting the
478 * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On
479 * connectors where probing live outputs can result in visual distortion drivers
480 * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this.
481 * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are
482 * completely ignored by the polling logic.
483 *
484 * Note that a connector can be both polled and probed from the hotplug handler,
485 * in case the hotplug interrupt is known to be unreliable.
486 */
487void drm_kms_helper_poll_init(struct drm_device *dev)
488{
489 INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
490 dev->mode_config.poll_enabled = true;
491
492 drm_kms_helper_poll_enable(dev);
493}
494EXPORT_SYMBOL(drm_kms_helper_poll_init);
495
496/**
497 * drm_kms_helper_poll_fini - disable output polling and clean it up
498 * @dev: drm_device
499 */
500void drm_kms_helper_poll_fini(struct drm_device *dev)
501{
502 drm_kms_helper_poll_disable(dev);
503}
504EXPORT_SYMBOL(drm_kms_helper_poll_fini);
505
506/**
507 * drm_helper_hpd_irq_event - hotplug processing
508 * @dev: drm_device
509 *
510 * Drivers can use this helper function to run a detect cycle on all connectors
511 * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All
512 * other connectors are ignored, which is useful to avoid reprobing fixed
513 * panels.
514 *
515 * This helper function is useful for drivers which can't or don't track hotplug
516 * interrupts for each connector.
517 *
518 * Drivers which support hotplug interrupts for each connector individually and
519 * which have a more fine-grained detect logic should bypass this code and
520 * directly call drm_kms_helper_hotplug_event() in case the connector state
521 * changed.
522 *
523 * This function must be called from process context with no mode
524 * setting locks held.
525 *
526 * Note that a connector can be both polled and probed from the hotplug handler,
527 * in case the hotplug interrupt is known to be unreliable.
528 */
529bool drm_helper_hpd_irq_event(struct drm_device *dev)
530{
531 struct drm_connector *connector;
532 enum drm_connector_status old_status;
533 bool changed = false;
534
535 if (!dev->mode_config.poll_enabled)
536 return false;
537
538 mutex_lock(&dev->mode_config.mutex);
539 drm_for_each_connector(connector, dev) {
540
541 /* Only handle HPD capable connectors. */
542 if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
543 continue;
544
545 old_status = connector->status;
546
547 connector->status = connector->funcs->detect(connector, false);
548 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
549 connector->base.id,
550 connector->name,
551 drm_get_connector_status_name(old_status),
552 drm_get_connector_status_name(connector->status));
553 if (old_status != connector->status)
554 changed = true;
555 }
556
557 mutex_unlock(&dev->mode_config.mutex);
558
559 if (changed)
560 drm_kms_helper_hotplug_event(dev);
561
562 return changed;
563}
564EXPORT_SYMBOL(drm_helper_hpd_irq_event);
1/*
2 * Copyright (c) 2006-2008 Intel Corporation
3 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
4 *
5 * DRM core CRTC related functions
6 *
7 * Permission to use, copy, modify, distribute, and sell this software and its
8 * documentation for any purpose is hereby granted without fee, provided that
9 * the above copyright notice appear in all copies and that both that copyright
10 * notice and this permission notice appear in supporting documentation, and
11 * that the name of the copyright holders not be used in advertising or
12 * publicity pertaining to distribution of the software without specific,
13 * written prior permission. The copyright holders make no representations
14 * about the suitability of this software for any purpose. It is provided "as
15 * is" without express or implied warranty.
16 *
17 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
19 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
20 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
21 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
22 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
23 * OF THIS SOFTWARE.
24 *
25 * Authors:
26 * Keith Packard
27 * Eric Anholt <eric@anholt.net>
28 * Dave Airlie <airlied@linux.ie>
29 * Jesse Barnes <jesse.barnes@intel.com>
30 */
31
32#include <linux/export.h>
33#include <linux/moduleparam.h>
34
35#include <drm/drmP.h>
36#include <drm/drm_crtc.h>
37#include <drm/drm_fourcc.h>
38#include <drm/drm_crtc_helper.h>
39#include <drm/drm_fb_helper.h>
40#include <drm/drm_edid.h>
41
42/**
43 * DOC: output probing helper overview
44 *
45 * This library provides some helper code for output probing. It provides an
46 * implementation of the core connector->fill_modes interface with
47 * drm_helper_probe_single_connector_modes.
48 *
49 * It also provides support for polling connectors with a work item and for
50 * generic hotplug interrupt handling where the driver doesn't or cannot keep
51 * track of a per-connector hpd interrupt.
52 *
53 * This helper library can be used independently of the modeset helper library.
54 * Drivers can also overwrite different parts e.g. use their own hotplug
55 * handling code to avoid probing unrelated outputs.
56 */
57
58static bool drm_kms_helper_poll = true;
59module_param_named(poll, drm_kms_helper_poll, bool, 0600);
60
61static void drm_mode_validate_flag(struct drm_connector *connector,
62 int flags)
63{
64 struct drm_display_mode *mode;
65
66 if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE |
67 DRM_MODE_FLAG_3D_MASK))
68 return;
69
70 list_for_each_entry(mode, &connector->modes, head) {
71 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
72 !(flags & DRM_MODE_FLAG_INTERLACE))
73 mode->status = MODE_NO_INTERLACE;
74 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
75 !(flags & DRM_MODE_FLAG_DBLSCAN))
76 mode->status = MODE_NO_DBLESCAN;
77 if ((mode->flags & DRM_MODE_FLAG_3D_MASK) &&
78 !(flags & DRM_MODE_FLAG_3D_MASK))
79 mode->status = MODE_NO_STEREO;
80 }
81
82 return;
83}
84
85/**
86 * drm_helper_probe_single_connector_modes - get complete set of display modes
87 * @connector: connector to probe
88 * @maxX: max width for modes
89 * @maxY: max height for modes
90 *
91 * Based on the helper callbacks implemented by @connector try to detect all
92 * valid modes. Modes will first be added to the connector's probed_modes list,
93 * then culled (based on validity and the @maxX, @maxY parameters) and put into
94 * the normal modes list.
95 *
96 * Intended to be use as a generic implementation of the ->fill_modes()
97 * @connector vfunc for drivers that use the crtc helpers for output mode
98 * filtering and detection.
99 *
100 * Returns:
101 * The number of modes found on @connector.
102 */
103int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
104 uint32_t maxX, uint32_t maxY)
105{
106 struct drm_device *dev = connector->dev;
107 struct drm_display_mode *mode;
108 struct drm_connector_helper_funcs *connector_funcs =
109 connector->helper_private;
110 int count = 0;
111 int mode_flags = 0;
112 bool verbose_prune = true;
113
114 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
115
116 DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
117 drm_get_connector_name(connector));
118 /* set all modes to the unverified state */
119 list_for_each_entry(mode, &connector->modes, head)
120 mode->status = MODE_UNVERIFIED;
121
122 if (connector->force) {
123 if (connector->force == DRM_FORCE_ON)
124 connector->status = connector_status_connected;
125 else
126 connector->status = connector_status_disconnected;
127 if (connector->funcs->force)
128 connector->funcs->force(connector);
129 } else {
130 connector->status = connector->funcs->detect(connector, true);
131 }
132
133 /* Re-enable polling in case the global poll config changed. */
134 if (drm_kms_helper_poll != dev->mode_config.poll_running)
135 drm_kms_helper_poll_enable(dev);
136
137 dev->mode_config.poll_running = drm_kms_helper_poll;
138
139 if (connector->status == connector_status_disconnected) {
140 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
141 connector->base.id, drm_get_connector_name(connector));
142 drm_mode_connector_update_edid_property(connector, NULL);
143 verbose_prune = false;
144 goto prune;
145 }
146
147#ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
148 count = drm_load_edid_firmware(connector);
149 if (count == 0)
150#endif
151 count = (*connector_funcs->get_modes)(connector);
152
153 if (count == 0 && connector->status == connector_status_connected)
154 count = drm_add_modes_noedid(connector, 1024, 768);
155 if (count == 0)
156 goto prune;
157
158 drm_mode_connector_list_update(connector);
159
160 if (maxX && maxY)
161 drm_mode_validate_size(dev, &connector->modes, maxX, maxY);
162
163 if (connector->interlace_allowed)
164 mode_flags |= DRM_MODE_FLAG_INTERLACE;
165 if (connector->doublescan_allowed)
166 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
167 if (connector->stereo_allowed)
168 mode_flags |= DRM_MODE_FLAG_3D_MASK;
169 drm_mode_validate_flag(connector, mode_flags);
170
171 list_for_each_entry(mode, &connector->modes, head) {
172 if (mode->status == MODE_OK)
173 mode->status = connector_funcs->mode_valid(connector,
174 mode);
175 }
176
177prune:
178 drm_mode_prune_invalid(dev, &connector->modes, verbose_prune);
179
180 if (list_empty(&connector->modes))
181 return 0;
182
183 list_for_each_entry(mode, &connector->modes, head)
184 mode->vrefresh = drm_mode_vrefresh(mode);
185
186 drm_mode_sort(&connector->modes);
187
188 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
189 drm_get_connector_name(connector));
190 list_for_each_entry(mode, &connector->modes, head) {
191 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
192 drm_mode_debug_printmodeline(mode);
193 }
194
195 return count;
196}
197EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
198
199/**
200 * drm_kms_helper_hotplug_event - fire off KMS hotplug events
201 * @dev: drm_device whose connector state changed
202 *
203 * This function fires off the uevent for userspace and also calls the
204 * output_poll_changed function, which is most commonly used to inform the fbdev
205 * emulation code and allow it to update the fbcon output configuration.
206 *
207 * Drivers should call this from their hotplug handling code when a change is
208 * detected. Note that this function does not do any output detection of its
209 * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the
210 * driver already.
211 *
212 * This function must be called from process context with no mode
213 * setting locks held.
214 */
215void drm_kms_helper_hotplug_event(struct drm_device *dev)
216{
217 /* send a uevent + call fbdev */
218 drm_sysfs_hotplug_event(dev);
219 if (dev->mode_config.funcs->output_poll_changed)
220 dev->mode_config.funcs->output_poll_changed(dev);
221}
222EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
223
224#define DRM_OUTPUT_POLL_PERIOD (10*HZ)
225static void output_poll_execute(struct work_struct *work)
226{
227 struct delayed_work *delayed_work = to_delayed_work(work);
228 struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
229 struct drm_connector *connector;
230 enum drm_connector_status old_status;
231 bool repoll = false, changed = false;
232
233 if (!drm_kms_helper_poll)
234 return;
235
236 mutex_lock(&dev->mode_config.mutex);
237 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
238
239 /* Ignore forced connectors. */
240 if (connector->force)
241 continue;
242
243 /* Ignore HPD capable connectors and connectors where we don't
244 * want any hotplug detection at all for polling. */
245 if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
246 continue;
247
248 repoll = true;
249
250 old_status = connector->status;
251 /* if we are connected and don't want to poll for disconnect
252 skip it */
253 if (old_status == connector_status_connected &&
254 !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
255 continue;
256
257 connector->status = connector->funcs->detect(connector, false);
258 if (old_status != connector->status) {
259 const char *old, *new;
260
261 old = drm_get_connector_status_name(old_status);
262 new = drm_get_connector_status_name(connector->status);
263
264 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
265 "status updated from %s to %s\n",
266 connector->base.id,
267 drm_get_connector_name(connector),
268 old, new);
269
270 changed = true;
271 }
272 }
273
274 mutex_unlock(&dev->mode_config.mutex);
275
276 if (changed)
277 drm_kms_helper_hotplug_event(dev);
278
279 if (repoll)
280 schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
281}
282
283/**
284 * drm_kms_helper_poll_disable - disable output polling
285 * @dev: drm_device
286 *
287 * This function disables the output polling work.
288 *
289 * Drivers can call this helper from their device suspend implementation. It is
290 * not an error to call this even when output polling isn't enabled or arlready
291 * disabled.
292 */
293void drm_kms_helper_poll_disable(struct drm_device *dev)
294{
295 if (!dev->mode_config.poll_enabled)
296 return;
297 cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
298}
299EXPORT_SYMBOL(drm_kms_helper_poll_disable);
300
301/**
302 * drm_kms_helper_poll_enable - re-enable output polling.
303 * @dev: drm_device
304 *
305 * This function re-enables the output polling work.
306 *
307 * Drivers can call this helper from their device resume implementation. It is
308 * an error to call this when the output polling support has not yet been set
309 * up.
310 */
311void drm_kms_helper_poll_enable(struct drm_device *dev)
312{
313 bool poll = false;
314 struct drm_connector *connector;
315
316 if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
317 return;
318
319 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
320 if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
321 DRM_CONNECTOR_POLL_DISCONNECT))
322 poll = true;
323 }
324
325 if (poll)
326 schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
327}
328EXPORT_SYMBOL(drm_kms_helper_poll_enable);
329
330/**
331 * drm_kms_helper_poll_init - initialize and enable output polling
332 * @dev: drm_device
333 *
334 * This function intializes and then also enables output polling support for
335 * @dev. Drivers which do not have reliable hotplug support in hardware can use
336 * this helper infrastructure to regularly poll such connectors for changes in
337 * their connection state.
338 *
339 * Drivers can control which connectors are polled by setting the
340 * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On
341 * connectors where probing live outputs can result in visual distortion drivers
342 * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this.
343 * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are
344 * completely ignored by the polling logic.
345 *
346 * Note that a connector can be both polled and probed from the hotplug handler,
347 * in case the hotplug interrupt is known to be unreliable.
348 */
349void drm_kms_helper_poll_init(struct drm_device *dev)
350{
351 INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
352 dev->mode_config.poll_enabled = true;
353
354 drm_kms_helper_poll_enable(dev);
355}
356EXPORT_SYMBOL(drm_kms_helper_poll_init);
357
358/**
359 * drm_kms_helper_poll_fini - disable output polling and clean it up
360 * @dev: drm_device
361 */
362void drm_kms_helper_poll_fini(struct drm_device *dev)
363{
364 drm_kms_helper_poll_disable(dev);
365}
366EXPORT_SYMBOL(drm_kms_helper_poll_fini);
367
368/**
369 * drm_helper_hpd_irq_event - hotplug processing
370 * @dev: drm_device
371 *
372 * Drivers can use this helper function to run a detect cycle on all connectors
373 * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All
374 * other connectors are ignored, which is useful to avoid reprobing fixed
375 * panels.
376 *
377 * This helper function is useful for drivers which can't or don't track hotplug
378 * interrupts for each connector.
379 *
380 * Drivers which support hotplug interrupts for each connector individually and
381 * which have a more fine-grained detect logic should bypass this code and
382 * directly call drm_kms_helper_hotplug_event() in case the connector state
383 * changed.
384 *
385 * This function must be called from process context with no mode
386 * setting locks held.
387 *
388 * Note that a connector can be both polled and probed from the hotplug handler,
389 * in case the hotplug interrupt is known to be unreliable.
390 */
391bool drm_helper_hpd_irq_event(struct drm_device *dev)
392{
393 struct drm_connector *connector;
394 enum drm_connector_status old_status;
395 bool changed = false;
396
397 if (!dev->mode_config.poll_enabled)
398 return false;
399
400 mutex_lock(&dev->mode_config.mutex);
401 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
402
403 /* Only handle HPD capable connectors. */
404 if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
405 continue;
406
407 old_status = connector->status;
408
409 connector->status = connector->funcs->detect(connector, false);
410 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
411 connector->base.id,
412 drm_get_connector_name(connector),
413 drm_get_connector_status_name(old_status),
414 drm_get_connector_status_name(connector->status));
415 if (old_status != connector->status)
416 changed = true;
417 }
418
419 mutex_unlock(&dev->mode_config.mutex);
420
421 if (changed)
422 drm_kms_helper_hotplug_event(dev);
423
424 return changed;
425}
426EXPORT_SYMBOL(drm_helper_hpd_irq_event);