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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/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_fb_helper.h>
40 : : #include <drm/drm_fourcc.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
71 : 0 : drm_mode_validate_flag(const struct drm_display_mode *mode,
72 : : int flags)
73 : : {
74 : 0 : if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
75 [ # # ]: 0 : !(flags & DRM_MODE_FLAG_INTERLACE))
76 : : return MODE_NO_INTERLACE;
77 : :
78 [ # # ]: 0 : if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
79 [ # # ]: 0 : !(flags & DRM_MODE_FLAG_DBLSCAN))
80 : : return MODE_NO_DBLESCAN;
81 : :
82 [ # # ]: 0 : if ((mode->flags & DRM_MODE_FLAG_3D_MASK) &&
83 [ # # ]: 0 : !(flags & DRM_MODE_FLAG_3D_MASK))
84 : 0 : return MODE_NO_STEREO;
85 : :
86 : : return MODE_OK;
87 : : }
88 : :
89 : : static enum drm_mode_status
90 : 0 : drm_mode_validate_pipeline(struct drm_display_mode *mode,
91 : : struct drm_connector *connector)
92 : : {
93 : 0 : struct drm_device *dev = connector->dev;
94 : 0 : enum drm_mode_status ret = MODE_OK;
95 : 0 : struct drm_encoder *encoder;
96 : :
97 : : /* Step 1: Validate against connector */
98 : 0 : ret = drm_connector_mode_valid(connector, mode);
99 [ # # ]: 0 : if (ret != MODE_OK)
100 : : return ret;
101 : :
102 : : /* Step 2: Validate against encoders and crtcs */
103 [ # # # # ]: 0 : drm_connector_for_each_possible_encoder(connector, encoder) {
104 : 0 : struct drm_bridge *bridge;
105 : 0 : struct drm_crtc *crtc;
106 : :
107 : 0 : ret = drm_encoder_mode_valid(encoder, mode);
108 [ # # ]: 0 : if (ret != MODE_OK) {
109 : : /* No point in continuing for crtc check as this encoder
110 : : * will not accept the mode anyway. If all encoders
111 : : * reject the mode then, at exit, ret will not be
112 : : * MODE_OK. */
113 : 0 : continue;
114 : : }
115 : :
116 [ # # ]: 0 : bridge = drm_bridge_chain_get_first_bridge(encoder);
117 : 0 : ret = drm_bridge_chain_mode_valid(bridge, mode);
118 [ # # ]: 0 : if (ret != MODE_OK) {
119 : : /* There is also no point in continuing for crtc check
120 : : * here. */
121 : 0 : continue;
122 : : }
123 : :
124 [ # # ]: 0 : drm_for_each_crtc(crtc, dev) {
125 [ # # ]: 0 : if (!drm_encoder_crtc_ok(encoder, crtc))
126 : 0 : continue;
127 : :
128 : 0 : ret = drm_crtc_mode_valid(crtc, mode);
129 [ # # ]: 0 : if (ret == MODE_OK) {
130 : : /* If we get to this point there is at least
131 : : * one combination of encoder+crtc that works
132 : : * for this mode. Lets return now. */
133 : 0 : return ret;
134 : : }
135 : : }
136 : : }
137 : :
138 : : return ret;
139 : : }
140 : :
141 : 0 : static int drm_helper_probe_add_cmdline_mode(struct drm_connector *connector)
142 : : {
143 : 0 : struct drm_cmdline_mode *cmdline_mode;
144 : 0 : struct drm_display_mode *mode;
145 : :
146 : 0 : cmdline_mode = &connector->cmdline_mode;
147 [ # # ]: 0 : if (!cmdline_mode->specified)
148 : : return 0;
149 : :
150 : : /* Only add a GTF mode if we find no matching probed modes */
151 [ # # ]: 0 : list_for_each_entry(mode, &connector->probed_modes, head) {
152 [ # # ]: 0 : if (mode->hdisplay != cmdline_mode->xres ||
153 [ # # ]: 0 : mode->vdisplay != cmdline_mode->yres)
154 : 0 : continue;
155 : :
156 [ # # ]: 0 : if (cmdline_mode->refresh_specified) {
157 : : /* The probed mode's vrefresh is set until later */
158 [ # # ]: 0 : if (drm_mode_vrefresh(mode) != cmdline_mode->refresh)
159 : 0 : continue;
160 : : }
161 : :
162 : : return 0;
163 : : }
164 : :
165 : 0 : mode = drm_mode_create_from_cmdline_mode(connector->dev,
166 : : cmdline_mode);
167 [ # # ]: 0 : if (mode == NULL)
168 : : return 0;
169 : :
170 : 0 : drm_mode_probed_add(connector, mode);
171 : 0 : return 1;
172 : : }
173 : :
174 : 0 : enum drm_mode_status drm_crtc_mode_valid(struct drm_crtc *crtc,
175 : : const struct drm_display_mode *mode)
176 : : {
177 : 0 : const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
178 : :
179 [ # # # # : 0 : if (!crtc_funcs || !crtc_funcs->mode_valid)
# # # # ]
180 : : return MODE_OK;
181 : :
182 : 0 : return crtc_funcs->mode_valid(crtc, mode);
183 : : }
184 : :
185 : 0 : enum drm_mode_status drm_encoder_mode_valid(struct drm_encoder *encoder,
186 : : const struct drm_display_mode *mode)
187 : : {
188 : 0 : const struct drm_encoder_helper_funcs *encoder_funcs =
189 : : encoder->helper_private;
190 : :
191 [ # # # # : 0 : if (!encoder_funcs || !encoder_funcs->mode_valid)
# # # # ]
192 : : return MODE_OK;
193 : :
194 : 0 : return encoder_funcs->mode_valid(encoder, mode);
195 : : }
196 : :
197 : 0 : enum drm_mode_status drm_connector_mode_valid(struct drm_connector *connector,
198 : : struct drm_display_mode *mode)
199 : : {
200 : 0 : const struct drm_connector_helper_funcs *connector_funcs =
201 : : connector->helper_private;
202 : :
203 [ # # # # : 0 : if (!connector_funcs || !connector_funcs->mode_valid)
# # # # ]
204 : : return MODE_OK;
205 : :
206 : 0 : return connector_funcs->mode_valid(connector, mode);
207 : : }
208 : :
209 : : #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
210 : : /**
211 : : * drm_kms_helper_poll_enable - re-enable output polling.
212 : : * @dev: drm_device
213 : : *
214 : : * This function re-enables the output polling work, after it has been
215 : : * temporarily disabled using drm_kms_helper_poll_disable(), for example over
216 : : * suspend/resume.
217 : : *
218 : : * Drivers can call this helper from their device resume implementation. It is
219 : : * not an error to call this even when output polling isn't enabled.
220 : : *
221 : : * Note that calls to enable and disable polling must be strictly ordered, which
222 : : * is automatically the case when they're only call from suspend/resume
223 : : * callbacks.
224 : : */
225 : 0 : void drm_kms_helper_poll_enable(struct drm_device *dev)
226 : : {
227 : 0 : bool poll = false;
228 : 0 : struct drm_connector *connector;
229 : 0 : struct drm_connector_list_iter conn_iter;
230 : 0 : unsigned long delay = DRM_OUTPUT_POLL_PERIOD;
231 : :
232 [ # # # # ]: 0 : if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
233 : 0 : return;
234 : :
235 : 0 : drm_connector_list_iter_begin(dev, &conn_iter);
236 [ # # ]: 0 : drm_for_each_connector_iter(connector, &conn_iter) {
237 [ # # ]: 0 : if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
238 : : DRM_CONNECTOR_POLL_DISCONNECT))
239 : 0 : poll = true;
240 : : }
241 : 0 : drm_connector_list_iter_end(&conn_iter);
242 : :
243 [ # # ]: 0 : if (dev->mode_config.delayed_event) {
244 : : /*
245 : : * FIXME:
246 : : *
247 : : * Use short (1s) delay to handle the initial delayed event.
248 : : * This delay should not be needed, but Optimus/nouveau will
249 : : * fail in a mysterious way if the delayed event is handled as
250 : : * soon as possible like it is done in
251 : : * drm_helper_probe_single_connector_modes() in case the poll
252 : : * was enabled before.
253 : : */
254 : : poll = true;
255 : : delay = HZ;
256 : : }
257 : :
258 [ # # ]: 0 : if (poll)
259 : 0 : schedule_delayed_work(&dev->mode_config.output_poll_work, delay);
260 : : }
261 : : EXPORT_SYMBOL(drm_kms_helper_poll_enable);
262 : :
263 : : static enum drm_connector_status
264 : 0 : drm_helper_probe_detect_ctx(struct drm_connector *connector, bool force)
265 : : {
266 : 0 : const struct drm_connector_helper_funcs *funcs = connector->helper_private;
267 : 0 : struct drm_modeset_acquire_ctx ctx;
268 : 0 : int ret;
269 : :
270 : 0 : drm_modeset_acquire_init(&ctx, 0);
271 : :
272 : 0 : retry:
273 : 0 : ret = drm_modeset_lock(&connector->dev->mode_config.connection_mutex, &ctx);
274 [ # # ]: 0 : if (!ret) {
275 [ # # ]: 0 : if (funcs->detect_ctx)
276 : 0 : ret = funcs->detect_ctx(connector, &ctx, force);
277 [ # # ]: 0 : else if (connector->funcs->detect)
278 : 0 : ret = connector->funcs->detect(connector, force);
279 : : else
280 : : ret = connector_status_connected;
281 : : }
282 : :
283 [ # # ]: 0 : if (ret == -EDEADLK) {
284 : 0 : drm_modeset_backoff(&ctx);
285 : 0 : goto retry;
286 : : }
287 : :
288 [ # # # # ]: 0 : if (WARN_ON(ret < 0))
289 : 0 : ret = connector_status_unknown;
290 : :
291 : 0 : drm_modeset_drop_locks(&ctx);
292 : 0 : drm_modeset_acquire_fini(&ctx);
293 : :
294 : 0 : return ret;
295 : : }
296 : :
297 : : /**
298 : : * drm_helper_probe_detect - probe connector status
299 : : * @connector: connector to probe
300 : : * @ctx: acquire_ctx, or NULL to let this function handle locking.
301 : : * @force: Whether destructive probe operations should be performed.
302 : : *
303 : : * This function calls the detect callbacks of the connector.
304 : : * This function returns &drm_connector_status, or
305 : : * if @ctx is set, it might also return -EDEADLK.
306 : : */
307 : : int
308 : 0 : drm_helper_probe_detect(struct drm_connector *connector,
309 : : struct drm_modeset_acquire_ctx *ctx,
310 : : bool force)
311 : : {
312 : 0 : const struct drm_connector_helper_funcs *funcs = connector->helper_private;
313 : 0 : struct drm_device *dev = connector->dev;
314 : 0 : int ret;
315 : :
316 [ # # ]: 0 : if (!ctx)
317 : 0 : return drm_helper_probe_detect_ctx(connector, force);
318 : :
319 : 0 : ret = drm_modeset_lock(&dev->mode_config.connection_mutex, ctx);
320 [ # # ]: 0 : if (ret)
321 : : return ret;
322 : :
323 [ # # ]: 0 : if (funcs->detect_ctx)
324 : 0 : return funcs->detect_ctx(connector, ctx, force);
325 [ # # ]: 0 : else if (connector->funcs->detect)
326 : 0 : return connector->funcs->detect(connector, force);
327 : : else
328 : : return connector_status_connected;
329 : : }
330 : : EXPORT_SYMBOL(drm_helper_probe_detect);
331 : :
332 : : /**
333 : : * drm_helper_probe_single_connector_modes - get complete set of display modes
334 : : * @connector: connector to probe
335 : : * @maxX: max width for modes
336 : : * @maxY: max height for modes
337 : : *
338 : : * Based on the helper callbacks implemented by @connector in struct
339 : : * &drm_connector_helper_funcs try to detect all valid modes. Modes will first
340 : : * be added to the connector's probed_modes list, then culled (based on validity
341 : : * and the @maxX, @maxY parameters) and put into the normal modes list.
342 : : *
343 : : * Intended to be used as a generic implementation of the
344 : : * &drm_connector_funcs.fill_modes() vfunc for drivers that use the CRTC helpers
345 : : * for output mode filtering and detection.
346 : : *
347 : : * The basic procedure is as follows
348 : : *
349 : : * 1. All modes currently on the connector's modes list are marked as stale
350 : : *
351 : : * 2. New modes are added to the connector's probed_modes list with
352 : : * drm_mode_probed_add(). New modes start their life with status as OK.
353 : : * Modes are added from a single source using the following priority order.
354 : : *
355 : : * - &drm_connector_helper_funcs.get_modes vfunc
356 : : * - if the connector status is connector_status_connected, standard
357 : : * VESA DMT modes up to 1024x768 are automatically added
358 : : * (drm_add_modes_noedid())
359 : : *
360 : : * Finally modes specified via the kernel command line (video=...) are
361 : : * added in addition to what the earlier probes produced
362 : : * (drm_helper_probe_add_cmdline_mode()). These modes are generated
363 : : * using the VESA GTF/CVT formulas.
364 : : *
365 : : * 3. Modes are moved from the probed_modes list to the modes list. Potential
366 : : * duplicates are merged together (see drm_connector_list_update()).
367 : : * After this step the probed_modes list will be empty again.
368 : : *
369 : : * 4. Any non-stale mode on the modes list then undergoes validation
370 : : *
371 : : * - drm_mode_validate_basic() performs basic sanity checks
372 : : * - drm_mode_validate_size() filters out modes larger than @maxX and @maxY
373 : : * (if specified)
374 : : * - drm_mode_validate_flag() checks the modes against basic connector
375 : : * capabilities (interlace_allowed,doublescan_allowed,stereo_allowed)
376 : : * - the optional &drm_connector_helper_funcs.mode_valid helper can perform
377 : : * driver and/or sink specific checks
378 : : * - the optional &drm_crtc_helper_funcs.mode_valid,
379 : : * &drm_bridge_funcs.mode_valid and &drm_encoder_helper_funcs.mode_valid
380 : : * helpers can perform driver and/or source specific checks which are also
381 : : * enforced by the modeset/atomic helpers
382 : : *
383 : : * 5. Any mode whose status is not OK is pruned from the connector's modes list,
384 : : * accompanied by a debug message indicating the reason for the mode's
385 : : * rejection (see drm_mode_prune_invalid()).
386 : : *
387 : : * Returns:
388 : : * The number of modes found on @connector.
389 : : */
390 : 0 : int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
391 : : uint32_t maxX, uint32_t maxY)
392 : : {
393 : 0 : struct drm_device *dev = connector->dev;
394 : 0 : struct drm_display_mode *mode;
395 : 0 : const struct drm_connector_helper_funcs *connector_funcs =
396 : : connector->helper_private;
397 : 0 : int count = 0, ret;
398 : 0 : int mode_flags = 0;
399 : 0 : bool verbose_prune = true;
400 : 0 : enum drm_connector_status old_status;
401 : 0 : struct drm_modeset_acquire_ctx ctx;
402 : :
403 [ # # ]: 0 : WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
404 : :
405 : 0 : drm_modeset_acquire_init(&ctx, 0);
406 : :
407 : 0 : DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
408 : : connector->name);
409 : :
410 : : retry:
411 : 0 : ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx);
412 [ # # ]: 0 : if (ret == -EDEADLK) {
413 : 0 : drm_modeset_backoff(&ctx);
414 : 0 : goto retry;
415 : : } else
416 [ # # ]: 0 : WARN_ON(ret < 0);
417 : :
418 : : /* set all old modes to the stale state */
419 [ # # ]: 0 : list_for_each_entry(mode, &connector->modes, head)
420 : 0 : mode->status = MODE_STALE;
421 : :
422 : 0 : old_status = connector->status;
423 : :
424 [ # # ]: 0 : if (connector->force) {
425 [ # # ]: 0 : if (connector->force == DRM_FORCE_ON ||
426 : : connector->force == DRM_FORCE_ON_DIGITAL)
427 : 0 : connector->status = connector_status_connected;
428 : : else
429 : 0 : connector->status = connector_status_disconnected;
430 [ # # ]: 0 : if (connector->funcs->force)
431 : 0 : connector->funcs->force(connector);
432 : : } else {
433 : 0 : ret = drm_helper_probe_detect(connector, &ctx, true);
434 : :
435 [ # # ]: 0 : if (ret == -EDEADLK) {
436 : 0 : drm_modeset_backoff(&ctx);
437 : 0 : goto retry;
438 [ # # # # ]: 0 : } else if (WARN(ret < 0, "Invalid return value %i for connector detection\n", ret))
439 : 0 : ret = connector_status_unknown;
440 : :
441 : 0 : connector->status = ret;
442 : : }
443 : :
444 : : /*
445 : : * Normally either the driver's hpd code or the poll loop should
446 : : * pick up any changes and fire the hotplug event. But if
447 : : * userspace sneaks in a probe, we might miss a change. Hence
448 : : * check here, and if anything changed start the hotplug code.
449 : : */
450 [ # # ]: 0 : if (old_status != connector->status) {
451 : 0 : DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
452 : : connector->base.id,
453 : : connector->name,
454 : : drm_get_connector_status_name(old_status),
455 : : drm_get_connector_status_name(connector->status));
456 : :
457 : : /*
458 : : * The hotplug event code might call into the fb
459 : : * helpers, and so expects that we do not hold any
460 : : * locks. Fire up the poll struct instead, it will
461 : : * disable itself again.
462 : : */
463 : 0 : dev->mode_config.delayed_event = true;
464 [ # # ]: 0 : if (dev->mode_config.poll_enabled)
465 : 0 : schedule_delayed_work(&dev->mode_config.output_poll_work,
466 : : 0);
467 : : }
468 : :
469 : : /* Re-enable polling in case the global poll config changed. */
470 [ # # ]: 0 : if (drm_kms_helper_poll != dev->mode_config.poll_running)
471 : 0 : drm_kms_helper_poll_enable(dev);
472 : :
473 : 0 : dev->mode_config.poll_running = drm_kms_helper_poll;
474 : :
475 [ # # ]: 0 : if (connector->status == connector_status_disconnected) {
476 : 0 : DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
477 : : connector->base.id, connector->name);
478 : 0 : drm_connector_update_edid_property(connector, NULL);
479 : 0 : verbose_prune = false;
480 : 0 : goto prune;
481 : : }
482 : :
483 : 0 : count = (*connector_funcs->get_modes)(connector);
484 : :
485 : : /*
486 : : * Fallback for when DDC probe failed in drm_get_edid() and thus skipped
487 : : * override/firmware EDID.
488 : : */
489 [ # # # # ]: 0 : if (count == 0 && connector->status == connector_status_connected)
490 : 0 : count = drm_add_override_edid_modes(connector);
491 : :
492 [ # # # # ]: 0 : if (count == 0 && connector->status == connector_status_connected)
493 : 0 : count = drm_add_modes_noedid(connector, 1024, 768);
494 : 0 : count += drm_helper_probe_add_cmdline_mode(connector);
495 [ # # ]: 0 : if (count == 0)
496 : 0 : goto prune;
497 : :
498 : 0 : drm_connector_list_update(connector);
499 : :
500 [ # # ]: 0 : if (connector->interlace_allowed)
501 : 0 : mode_flags |= DRM_MODE_FLAG_INTERLACE;
502 [ # # ]: 0 : if (connector->doublescan_allowed)
503 : 0 : mode_flags |= DRM_MODE_FLAG_DBLSCAN;
504 [ # # ]: 0 : if (connector->stereo_allowed)
505 : 0 : mode_flags |= DRM_MODE_FLAG_3D_MASK;
506 : :
507 [ # # ]: 0 : list_for_each_entry(mode, &connector->modes, head) {
508 [ # # ]: 0 : if (mode->status == MODE_OK)
509 : 0 : mode->status = drm_mode_validate_driver(dev, mode);
510 : :
511 [ # # ]: 0 : if (mode->status == MODE_OK)
512 : 0 : mode->status = drm_mode_validate_size(mode, maxX, maxY);
513 : :
514 [ # # ]: 0 : if (mode->status == MODE_OK)
515 [ # # ]: 0 : mode->status = drm_mode_validate_flag(mode, mode_flags);
516 : :
517 [ # # ]: 0 : if (mode->status == MODE_OK)
518 : 0 : mode->status = drm_mode_validate_pipeline(mode,
519 : : connector);
520 : :
521 [ # # ]: 0 : if (mode->status == MODE_OK)
522 : 0 : mode->status = drm_mode_validate_ycbcr420(mode,
523 : : connector);
524 : : }
525 : :
526 : 0 : prune:
527 : 0 : drm_mode_prune_invalid(dev, &connector->modes, verbose_prune);
528 : :
529 : 0 : drm_modeset_drop_locks(&ctx);
530 : 0 : drm_modeset_acquire_fini(&ctx);
531 : :
532 [ # # ]: 0 : if (list_empty(&connector->modes))
533 : : return 0;
534 : :
535 [ # # ]: 0 : list_for_each_entry(mode, &connector->modes, head)
536 : 0 : mode->vrefresh = drm_mode_vrefresh(mode);
537 : :
538 : 0 : drm_mode_sort(&connector->modes);
539 : :
540 : 0 : DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
541 : : connector->name);
542 [ # # ]: 0 : list_for_each_entry(mode, &connector->modes, head) {
543 : 0 : drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
544 : 0 : drm_mode_debug_printmodeline(mode);
545 : : }
546 : :
547 : : return count;
548 : : }
549 : : EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
550 : :
551 : : /**
552 : : * drm_kms_helper_hotplug_event - fire off KMS hotplug events
553 : : * @dev: drm_device whose connector state changed
554 : : *
555 : : * This function fires off the uevent for userspace and also calls the
556 : : * output_poll_changed function, which is most commonly used to inform the fbdev
557 : : * emulation code and allow it to update the fbcon output configuration.
558 : : *
559 : : * Drivers should call this from their hotplug handling code when a change is
560 : : * detected. Note that this function does not do any output detection of its
561 : : * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the
562 : : * driver already.
563 : : *
564 : : * This function must be called from process context with no mode
565 : : * setting locks held.
566 : : */
567 : 0 : void drm_kms_helper_hotplug_event(struct drm_device *dev)
568 : : {
569 : : /* send a uevent + call fbdev */
570 : 0 : drm_sysfs_hotplug_event(dev);
571 [ # # ]: 0 : if (dev->mode_config.funcs->output_poll_changed)
572 : 0 : dev->mode_config.funcs->output_poll_changed(dev);
573 : :
574 : 0 : drm_client_dev_hotplug(dev);
575 : 0 : }
576 : : EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
577 : :
578 : 0 : static void output_poll_execute(struct work_struct *work)
579 : : {
580 [ # # ]: 0 : struct delayed_work *delayed_work = to_delayed_work(work);
581 : 0 : struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
582 : 0 : struct drm_connector *connector;
583 : 0 : struct drm_connector_list_iter conn_iter;
584 : 0 : enum drm_connector_status old_status;
585 : 0 : bool repoll = false, changed;
586 : :
587 [ # # ]: 0 : if (!dev->mode_config.poll_enabled)
588 : 0 : return;
589 : :
590 : : /* Pick up any changes detected by the probe functions. */
591 : 0 : changed = dev->mode_config.delayed_event;
592 : 0 : dev->mode_config.delayed_event = false;
593 : :
594 [ # # ]: 0 : if (!drm_kms_helper_poll)
595 : 0 : goto out;
596 : :
597 [ # # ]: 0 : if (!mutex_trylock(&dev->mode_config.mutex)) {
598 : 0 : repoll = true;
599 : 0 : goto out;
600 : : }
601 : :
602 : 0 : drm_connector_list_iter_begin(dev, &conn_iter);
603 [ # # ]: 0 : drm_for_each_connector_iter(connector, &conn_iter) {
604 : : /* Ignore forced connectors. */
605 [ # # ]: 0 : if (connector->force)
606 : 0 : continue;
607 : :
608 : : /* Ignore HPD capable connectors and connectors where we don't
609 : : * want any hotplug detection at all for polling. */
610 [ # # ]: 0 : if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
611 : 0 : continue;
612 : :
613 : 0 : old_status = connector->status;
614 : : /* if we are connected and don't want to poll for disconnect
615 : : skip it */
616 [ # # # # ]: 0 : if (old_status == connector_status_connected &&
617 : : !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
618 : 0 : continue;
619 : :
620 : 0 : repoll = true;
621 : :
622 : 0 : connector->status = drm_helper_probe_detect(connector, NULL, false);
623 [ # # ]: 0 : if (old_status != connector->status) {
624 : 0 : const char *old, *new;
625 : :
626 : : /*
627 : : * The poll work sets force=false when calling detect so
628 : : * that drivers can avoid to do disruptive tests (e.g.
629 : : * when load detect cycles could cause flickering on
630 : : * other, running displays). This bears the risk that we
631 : : * flip-flop between unknown here in the poll work and
632 : : * the real state when userspace forces a full detect
633 : : * call after receiving a hotplug event due to this
634 : : * change.
635 : : *
636 : : * Hence clamp an unknown detect status to the old
637 : : * value.
638 : : */
639 [ # # ]: 0 : if (connector->status == connector_status_unknown) {
640 : 0 : connector->status = old_status;
641 : 0 : continue;
642 : : }
643 : :
644 : 0 : old = drm_get_connector_status_name(old_status);
645 : 0 : new = drm_get_connector_status_name(connector->status);
646 : :
647 : 0 : DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
648 : : "status updated from %s to %s\n",
649 : : connector->base.id,
650 : : connector->name,
651 : : old, new);
652 : :
653 : 0 : changed = true;
654 : : }
655 : : }
656 : 0 : drm_connector_list_iter_end(&conn_iter);
657 : :
658 : 0 : mutex_unlock(&dev->mode_config.mutex);
659 : :
660 : 0 : out:
661 [ # # ]: 0 : if (changed)
662 : 0 : drm_kms_helper_hotplug_event(dev);
663 : :
664 [ # # ]: 0 : if (repoll)
665 : 0 : schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
666 : : }
667 : :
668 : : /**
669 : : * drm_kms_helper_is_poll_worker - is %current task an output poll worker?
670 : : *
671 : : * Determine if %current task is an output poll worker. This can be used
672 : : * to select distinct code paths for output polling versus other contexts.
673 : : *
674 : : * One use case is to avoid a deadlock between the output poll worker and
675 : : * the autosuspend worker wherein the latter waits for polling to finish
676 : : * upon calling drm_kms_helper_poll_disable(), while the former waits for
677 : : * runtime suspend to finish upon calling pm_runtime_get_sync() in a
678 : : * connector ->detect hook.
679 : : */
680 : 0 : bool drm_kms_helper_is_poll_worker(void)
681 : : {
682 : 0 : struct work_struct *work = current_work();
683 : :
684 [ # # # # ]: 0 : return work && work->func == output_poll_execute;
685 : : }
686 : : EXPORT_SYMBOL(drm_kms_helper_is_poll_worker);
687 : :
688 : : /**
689 : : * drm_kms_helper_poll_disable - disable output polling
690 : : * @dev: drm_device
691 : : *
692 : : * This function disables the output polling work.
693 : : *
694 : : * Drivers can call this helper from their device suspend implementation. It is
695 : : * not an error to call this even when output polling isn't enabled or already
696 : : * disabled. Polling is re-enabled by calling drm_kms_helper_poll_enable().
697 : : *
698 : : * Note that calls to enable and disable polling must be strictly ordered, which
699 : : * is automatically the case when they're only call from suspend/resume
700 : : * callbacks.
701 : : */
702 : 0 : void drm_kms_helper_poll_disable(struct drm_device *dev)
703 : : {
704 [ # # ]: 0 : if (!dev->mode_config.poll_enabled)
705 : : return;
706 : 0 : cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
707 : : }
708 : : EXPORT_SYMBOL(drm_kms_helper_poll_disable);
709 : :
710 : : /**
711 : : * drm_kms_helper_poll_init - initialize and enable output polling
712 : : * @dev: drm_device
713 : : *
714 : : * This function intializes and then also enables output polling support for
715 : : * @dev. Drivers which do not have reliable hotplug support in hardware can use
716 : : * this helper infrastructure to regularly poll such connectors for changes in
717 : : * their connection state.
718 : : *
719 : : * Drivers can control which connectors are polled by setting the
720 : : * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On
721 : : * connectors where probing live outputs can result in visual distortion drivers
722 : : * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this.
723 : : * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are
724 : : * completely ignored by the polling logic.
725 : : *
726 : : * Note that a connector can be both polled and probed from the hotplug handler,
727 : : * in case the hotplug interrupt is known to be unreliable.
728 : : */
729 : 0 : void drm_kms_helper_poll_init(struct drm_device *dev)
730 : : {
731 : 0 : INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
732 : 0 : dev->mode_config.poll_enabled = true;
733 : :
734 : 0 : drm_kms_helper_poll_enable(dev);
735 : 0 : }
736 : : EXPORT_SYMBOL(drm_kms_helper_poll_init);
737 : :
738 : : /**
739 : : * drm_kms_helper_poll_fini - disable output polling and clean it up
740 : : * @dev: drm_device
741 : : */
742 : 0 : void drm_kms_helper_poll_fini(struct drm_device *dev)
743 : : {
744 [ # # ]: 0 : if (!dev->mode_config.poll_enabled)
745 : : return;
746 : :
747 : 0 : dev->mode_config.poll_enabled = false;
748 : 0 : cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
749 : : }
750 : : EXPORT_SYMBOL(drm_kms_helper_poll_fini);
751 : :
752 : : /**
753 : : * drm_helper_hpd_irq_event - hotplug processing
754 : : * @dev: drm_device
755 : : *
756 : : * Drivers can use this helper function to run a detect cycle on all connectors
757 : : * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All
758 : : * other connectors are ignored, which is useful to avoid reprobing fixed
759 : : * panels.
760 : : *
761 : : * This helper function is useful for drivers which can't or don't track hotplug
762 : : * interrupts for each connector.
763 : : *
764 : : * Drivers which support hotplug interrupts for each connector individually and
765 : : * which have a more fine-grained detect logic should bypass this code and
766 : : * directly call drm_kms_helper_hotplug_event() in case the connector state
767 : : * changed.
768 : : *
769 : : * This function must be called from process context with no mode
770 : : * setting locks held.
771 : : *
772 : : * Note that a connector can be both polled and probed from the hotplug handler,
773 : : * in case the hotplug interrupt is known to be unreliable.
774 : : */
775 : 0 : bool drm_helper_hpd_irq_event(struct drm_device *dev)
776 : : {
777 : 0 : struct drm_connector *connector;
778 : 0 : struct drm_connector_list_iter conn_iter;
779 : 0 : enum drm_connector_status old_status;
780 : 0 : bool changed = false;
781 : :
782 [ # # ]: 0 : if (!dev->mode_config.poll_enabled)
783 : : return false;
784 : :
785 : 0 : mutex_lock(&dev->mode_config.mutex);
786 : 0 : drm_connector_list_iter_begin(dev, &conn_iter);
787 [ # # ]: 0 : drm_for_each_connector_iter(connector, &conn_iter) {
788 : : /* Only handle HPD capable connectors. */
789 [ # # ]: 0 : if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
790 : 0 : continue;
791 : :
792 : 0 : old_status = connector->status;
793 : :
794 : 0 : connector->status = drm_helper_probe_detect(connector, NULL, false);
795 : 0 : DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
796 : : connector->base.id,
797 : : connector->name,
798 : : drm_get_connector_status_name(old_status),
799 : : drm_get_connector_status_name(connector->status));
800 [ # # ]: 0 : if (old_status != connector->status)
801 : 0 : changed = true;
802 : : }
803 : 0 : drm_connector_list_iter_end(&conn_iter);
804 : 0 : mutex_unlock(&dev->mode_config.mutex);
805 : :
806 [ # # ]: 0 : if (changed)
807 : 0 : drm_kms_helper_hotplug_event(dev);
808 : :
809 : : return changed;
810 : : }
811 : : EXPORT_SYMBOL(drm_helper_hpd_irq_event);
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