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8d754544 DV |
1 | /* |
2 | * Copyright (c) 2006-2008 Intel Corporation | |
3 | * Copyright (c) 2007 Dave Airlie <airlied@linux.ie> | |
4 | * | |
5 | * DRM core CRTC related functions | |
6 | * | |
7 | * Permission to use, copy, modify, distribute, and sell this software and its | |
8 | * documentation for any purpose is hereby granted without fee, provided that | |
9 | * the above copyright notice appear in all copies and that both that copyright | |
10 | * notice and this permission notice appear in supporting documentation, and | |
11 | * that the name of the copyright holders not be used in advertising or | |
12 | * publicity pertaining to distribution of the software without specific, | |
13 | * written prior permission. The copyright holders make no representations | |
14 | * about the suitability of this software for any purpose. It is provided "as | |
15 | * is" without express or implied warranty. | |
16 | * | |
17 | * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, | |
18 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO | |
19 | * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR | |
20 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, | |
21 | * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER | |
22 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE | |
23 | * OF THIS SOFTWARE. | |
24 | * | |
25 | * Authors: | |
26 | * Keith Packard | |
27 | * Eric Anholt <eric@anholt.net> | |
28 | * Dave Airlie <airlied@linux.ie> | |
29 | * Jesse Barnes <jesse.barnes@intel.com> | |
30 | */ | |
31 | ||
32 | #include <linux/export.h> | |
33 | #include <linux/moduleparam.h> | |
34 | ||
35 | #include <drm/drmP.h> | |
c76f0f7c | 36 | #include <drm/drm_client.h> |
8d754544 DV |
37 | #include <drm/drm_crtc.h> |
38 | #include <drm/drm_fourcc.h> | |
39 | #include <drm/drm_crtc_helper.h> | |
40 | #include <drm/drm_fb_helper.h> | |
41 | #include <drm/drm_edid.h> | |
da251bf8 JA |
42 | #include <drm/drm_modeset_helper_vtables.h> |
43 | ||
44 | #include "drm_crtc_helper_internal.h" | |
8d754544 DV |
45 | |
46 | /** | |
47 | * DOC: output probing helper overview | |
48 | * | |
49 | * This library provides some helper code for output probing. It provides an | |
6806cdf9 | 50 | * implementation of the core &drm_connector_funcs.fill_modes interface with |
1bbfe9d1 | 51 | * drm_helper_probe_single_connector_modes(). |
8d754544 DV |
52 | * |
53 | * It also provides support for polling connectors with a work item and for | |
54 | * generic hotplug interrupt handling where the driver doesn't or cannot keep | |
55 | * track of a per-connector hpd interrupt. | |
56 | * | |
57 | * This helper library can be used independently of the modeset helper library. | |
58 | * Drivers can also overwrite different parts e.g. use their own hotplug | |
59 | * handling code to avoid probing unrelated outputs. | |
092d01da DV |
60 | * |
61 | * The probe helpers share the function table structures with other display | |
ea0dd85a | 62 | * helper libraries. See &struct drm_connector_helper_funcs for the details. |
8d754544 DV |
63 | */ |
64 | ||
65 | static bool drm_kms_helper_poll = true; | |
66 | module_param_named(poll, drm_kms_helper_poll, bool, 0600); | |
67 | ||
05acaec3 VS |
68 | static enum drm_mode_status |
69 | drm_mode_validate_flag(const struct drm_display_mode *mode, | |
70 | int flags) | |
8d754544 | 71 | { |
05acaec3 VS |
72 | if ((mode->flags & DRM_MODE_FLAG_INTERLACE) && |
73 | !(flags & DRM_MODE_FLAG_INTERLACE)) | |
74 | return MODE_NO_INTERLACE; | |
8d754544 | 75 | |
05acaec3 VS |
76 | if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) && |
77 | !(flags & DRM_MODE_FLAG_DBLSCAN)) | |
78 | return MODE_NO_DBLESCAN; | |
8d754544 | 79 | |
05acaec3 VS |
80 | if ((mode->flags & DRM_MODE_FLAG_3D_MASK) && |
81 | !(flags & DRM_MODE_FLAG_3D_MASK)) | |
82 | return MODE_NO_STEREO; | |
8d754544 | 83 | |
05acaec3 | 84 | return MODE_OK; |
8d754544 DV |
85 | } |
86 | ||
97f973d6 JA |
87 | static enum drm_mode_status |
88 | drm_mode_validate_pipeline(struct drm_display_mode *mode, | |
89 | struct drm_connector *connector) | |
90 | { | |
91 | struct drm_device *dev = connector->dev; | |
97f973d6 | 92 | enum drm_mode_status ret = MODE_OK; |
83aefbb8 VS |
93 | struct drm_encoder *encoder; |
94 | int i; | |
97f973d6 JA |
95 | |
96 | /* Step 1: Validate against connector */ | |
97 | ret = drm_connector_mode_valid(connector, mode); | |
98 | if (ret != MODE_OK) | |
99 | return ret; | |
100 | ||
101 | /* Step 2: Validate against encoders and crtcs */ | |
83aefbb8 | 102 | drm_connector_for_each_possible_encoder(connector, encoder, i) { |
97f973d6 JA |
103 | struct drm_crtc *crtc; |
104 | ||
97f973d6 JA |
105 | ret = drm_encoder_mode_valid(encoder, mode); |
106 | if (ret != MODE_OK) { | |
107 | /* No point in continuing for crtc check as this encoder | |
108 | * will not accept the mode anyway. If all encoders | |
109 | * reject the mode then, at exit, ret will not be | |
110 | * MODE_OK. */ | |
111 | continue; | |
112 | } | |
113 | ||
114 | ret = drm_bridge_mode_valid(encoder->bridge, mode); | |
115 | if (ret != MODE_OK) { | |
116 | /* There is also no point in continuing for crtc check | |
117 | * here. */ | |
118 | continue; | |
119 | } | |
120 | ||
121 | drm_for_each_crtc(crtc, dev) { | |
122 | if (!drm_encoder_crtc_ok(encoder, crtc)) | |
123 | continue; | |
124 | ||
125 | ret = drm_crtc_mode_valid(crtc, mode); | |
126 | if (ret == MODE_OK) { | |
127 | /* If we get to this point there is at least | |
128 | * one combination of encoder+crtc that works | |
129 | * for this mode. Lets return now. */ | |
130 | return ret; | |
131 | } | |
132 | } | |
133 | } | |
134 | ||
135 | return ret; | |
136 | } | |
137 | ||
eaf99c74 CW |
138 | static int drm_helper_probe_add_cmdline_mode(struct drm_connector *connector) |
139 | { | |
5f0c3f99 | 140 | struct drm_cmdline_mode *cmdline_mode; |
eaf99c74 CW |
141 | struct drm_display_mode *mode; |
142 | ||
5f0c3f99 CW |
143 | cmdline_mode = &connector->cmdline_mode; |
144 | if (!cmdline_mode->specified) | |
eaf99c74 CW |
145 | return 0; |
146 | ||
5f0c3f99 CW |
147 | /* Only add a GTF mode if we find no matching probed modes */ |
148 | list_for_each_entry(mode, &connector->probed_modes, head) { | |
149 | if (mode->hdisplay != cmdline_mode->xres || | |
150 | mode->vdisplay != cmdline_mode->yres) | |
151 | continue; | |
152 | ||
153 | if (cmdline_mode->refresh_specified) { | |
154 | /* The probed mode's vrefresh is set until later */ | |
155 | if (drm_mode_vrefresh(mode) != cmdline_mode->refresh) | |
156 | continue; | |
157 | } | |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
eaf99c74 | 162 | mode = drm_mode_create_from_cmdline_mode(connector->dev, |
5f0c3f99 | 163 | cmdline_mode); |
eaf99c74 CW |
164 | if (mode == NULL) |
165 | return 0; | |
166 | ||
167 | drm_mode_probed_add(connector, mode); | |
168 | return 1; | |
169 | } | |
170 | ||
da251bf8 JA |
171 | enum drm_mode_status drm_crtc_mode_valid(struct drm_crtc *crtc, |
172 | const struct drm_display_mode *mode) | |
173 | { | |
174 | const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; | |
175 | ||
176 | if (!crtc_funcs || !crtc_funcs->mode_valid) | |
177 | return MODE_OK; | |
178 | ||
179 | return crtc_funcs->mode_valid(crtc, mode); | |
180 | } | |
181 | ||
182 | enum drm_mode_status drm_encoder_mode_valid(struct drm_encoder *encoder, | |
183 | const struct drm_display_mode *mode) | |
184 | { | |
185 | const struct drm_encoder_helper_funcs *encoder_funcs = | |
186 | encoder->helper_private; | |
187 | ||
188 | if (!encoder_funcs || !encoder_funcs->mode_valid) | |
189 | return MODE_OK; | |
190 | ||
191 | return encoder_funcs->mode_valid(encoder, mode); | |
192 | } | |
193 | ||
194 | enum drm_mode_status drm_connector_mode_valid(struct drm_connector *connector, | |
195 | struct drm_display_mode *mode) | |
196 | { | |
197 | const struct drm_connector_helper_funcs *connector_funcs = | |
198 | connector->helper_private; | |
199 | ||
200 | if (!connector_funcs || !connector_funcs->mode_valid) | |
201 | return MODE_OK; | |
202 | ||
203 | return connector_funcs->mode_valid(connector, mode); | |
204 | } | |
205 | ||
8c4ccc4a | 206 | #define DRM_OUTPUT_POLL_PERIOD (10*HZ) |
4ad640e9 | 207 | /** |
c4d79c22 | 208 | * drm_kms_helper_poll_enable - re-enable output polling. |
4ad640e9 EE |
209 | * @dev: drm_device |
210 | * | |
c4d79c22 DA |
211 | * This function re-enables the output polling work, after it has been |
212 | * temporarily disabled using drm_kms_helper_poll_disable(), for example over | |
213 | * suspend/resume. | |
4ad640e9 | 214 | * |
c4d79c22 | 215 | * Drivers can call this helper from their device resume implementation. It is |
b66d0f34 | 216 | * not an error to call this even when output polling isn't enabled. |
c4d79c22 DA |
217 | * |
218 | * Note that calls to enable and disable polling must be strictly ordered, which | |
219 | * is automatically the case when they're only call from suspend/resume | |
220 | * callbacks. | |
4ad640e9 | 221 | */ |
c4d79c22 | 222 | void drm_kms_helper_poll_enable(struct drm_device *dev) |
8c4ccc4a DV |
223 | { |
224 | bool poll = false; | |
225 | struct drm_connector *connector; | |
c36a3254 | 226 | struct drm_connector_list_iter conn_iter; |
339fd362 | 227 | unsigned long delay = DRM_OUTPUT_POLL_PERIOD; |
8c4ccc4a | 228 | |
8c4ccc4a DV |
229 | if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll) |
230 | return; | |
231 | ||
b982dab1 | 232 | drm_connector_list_iter_begin(dev, &conn_iter); |
c36a3254 | 233 | drm_for_each_connector_iter(connector, &conn_iter) { |
8c4ccc4a DV |
234 | if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | |
235 | DRM_CONNECTOR_POLL_DISCONNECT)) | |
236 | poll = true; | |
237 | } | |
b982dab1 | 238 | drm_connector_list_iter_end(&conn_iter); |
8c4ccc4a | 239 | |
339fd362 | 240 | if (dev->mode_config.delayed_event) { |
68f458ee PU |
241 | /* |
242 | * FIXME: | |
243 | * | |
244 | * Use short (1s) delay to handle the initial delayed event. | |
245 | * This delay should not be needed, but Optimus/nouveau will | |
246 | * fail in a mysterious way if the delayed event is handled as | |
247 | * soon as possible like it is done in | |
248 | * drm_helper_probe_single_connector_modes() in case the poll | |
249 | * was enabled before. | |
250 | */ | |
339fd362 | 251 | poll = true; |
68f458ee | 252 | delay = HZ; |
339fd362 PU |
253 | } |
254 | ||
8c4ccc4a | 255 | if (poll) |
339fd362 | 256 | schedule_delayed_work(&dev->mode_config.output_poll_work, delay); |
8c4ccc4a | 257 | } |
c4d79c22 | 258 | EXPORT_SYMBOL(drm_kms_helper_poll_enable); |
4ad640e9 | 259 | |
949f0886 | 260 | static enum drm_connector_status |
6c5ed5ae | 261 | drm_helper_probe_detect_ctx(struct drm_connector *connector, bool force) |
949f0886 | 262 | { |
6c5ed5ae ML |
263 | const struct drm_connector_helper_funcs *funcs = connector->helper_private; |
264 | struct drm_modeset_acquire_ctx ctx; | |
265 | int ret; | |
266 | ||
267 | drm_modeset_acquire_init(&ctx, 0); | |
268 | ||
269 | retry: | |
270 | ret = drm_modeset_lock(&connector->dev->mode_config.connection_mutex, &ctx); | |
271 | if (!ret) { | |
272 | if (funcs->detect_ctx) | |
273 | ret = funcs->detect_ctx(connector, &ctx, force); | |
274 | else if (connector->funcs->detect) | |
275 | ret = connector->funcs->detect(connector, force); | |
276 | else | |
277 | ret = connector_status_connected; | |
278 | } | |
279 | ||
280 | if (ret == -EDEADLK) { | |
281 | drm_modeset_backoff(&ctx); | |
282 | goto retry; | |
283 | } | |
284 | ||
285 | if (WARN_ON(ret < 0)) | |
286 | ret = connector_status_unknown; | |
287 | ||
288 | drm_modeset_drop_locks(&ctx); | |
289 | drm_modeset_acquire_fini(&ctx); | |
290 | ||
291 | return ret; | |
292 | } | |
293 | ||
294 | /** | |
295 | * drm_helper_probe_detect - probe connector status | |
296 | * @connector: connector to probe | |
297 | * @ctx: acquire_ctx, or NULL to let this function handle locking. | |
298 | * @force: Whether destructive probe operations should be performed. | |
299 | * | |
300 | * This function calls the detect callbacks of the connector. | |
301 | * This function returns &drm_connector_status, or | |
302 | * if @ctx is set, it might also return -EDEADLK. | |
303 | */ | |
304 | int | |
305 | drm_helper_probe_detect(struct drm_connector *connector, | |
306 | struct drm_modeset_acquire_ctx *ctx, | |
307 | bool force) | |
308 | { | |
309 | const struct drm_connector_helper_funcs *funcs = connector->helper_private; | |
310 | struct drm_device *dev = connector->dev; | |
311 | int ret; | |
312 | ||
313 | if (!ctx) | |
314 | return drm_helper_probe_detect_ctx(connector, force); | |
315 | ||
316 | ret = drm_modeset_lock(&dev->mode_config.connection_mutex, ctx); | |
317 | if (ret) | |
318 | return ret; | |
319 | ||
320 | if (funcs->detect_ctx) | |
321 | return funcs->detect_ctx(connector, ctx, force); | |
322 | else if (connector->funcs->detect) | |
323 | return connector->funcs->detect(connector, force); | |
324 | else | |
325 | return connector_status_connected; | |
949f0886 | 326 | } |
6c5ed5ae | 327 | EXPORT_SYMBOL(drm_helper_probe_detect); |
949f0886 | 328 | |
6af3e656 VS |
329 | /** |
330 | * drm_helper_probe_single_connector_modes - get complete set of display modes | |
331 | * @connector: connector to probe | |
332 | * @maxX: max width for modes | |
333 | * @maxY: max height for modes | |
334 | * | |
335 | * Based on the helper callbacks implemented by @connector in struct | |
336 | * &drm_connector_helper_funcs try to detect all valid modes. Modes will first | |
337 | * be added to the connector's probed_modes list, then culled (based on validity | |
338 | * and the @maxX, @maxY parameters) and put into the normal modes list. | |
339 | * | |
6806cdf9 DV |
340 | * Intended to be used as a generic implementation of the |
341 | * &drm_connector_funcs.fill_modes() vfunc for drivers that use the CRTC helpers | |
342 | * for output mode filtering and detection. | |
6af3e656 | 343 | * |
5dec293b VS |
344 | * The basic procedure is as follows |
345 | * | |
346 | * 1. All modes currently on the connector's modes list are marked as stale | |
347 | * | |
348 | * 2. New modes are added to the connector's probed_modes list with | |
349 | * drm_mode_probed_add(). New modes start their life with status as OK. | |
350 | * Modes are added from a single source using the following priority order. | |
351 | * | |
6806cdf9 | 352 | * - &drm_connector_helper_funcs.get_modes vfunc |
5dec293b VS |
353 | * - if the connector status is connector_status_connected, standard |
354 | * VESA DMT modes up to 1024x768 are automatically added | |
355 | * (drm_add_modes_noedid()) | |
356 | * | |
357 | * Finally modes specified via the kernel command line (video=...) are | |
358 | * added in addition to what the earlier probes produced | |
359 | * (drm_helper_probe_add_cmdline_mode()). These modes are generated | |
360 | * using the VESA GTF/CVT formulas. | |
361 | * | |
362 | * 3. Modes are moved from the probed_modes list to the modes list. Potential | |
363 | * duplicates are merged together (see drm_mode_connector_list_update()). | |
364 | * After this step the probed_modes list will be empty again. | |
365 | * | |
366 | * 4. Any non-stale mode on the modes list then undergoes validation | |
367 | * | |
368 | * - drm_mode_validate_basic() performs basic sanity checks | |
369 | * - drm_mode_validate_size() filters out modes larger than @maxX and @maxY | |
370 | * (if specified) | |
57366a8d MY |
371 | * - drm_mode_validate_flag() checks the modes against basic connector |
372 | * capabilities (interlace_allowed,doublescan_allowed,stereo_allowed) | |
6806cdf9 | 373 | * - the optional &drm_connector_helper_funcs.mode_valid helper can perform |
97f973d6 JA |
374 | * driver and/or sink specific checks |
375 | * - the optional &drm_crtc_helper_funcs.mode_valid, | |
376 | * &drm_bridge_funcs.mode_valid and &drm_encoder_helper_funcs.mode_valid | |
377 | * helpers can perform driver and/or source specific checks which are also | |
378 | * enforced by the modeset/atomic helpers | |
5dec293b VS |
379 | * |
380 | * 5. Any mode whose status is not OK is pruned from the connector's modes list, | |
381 | * accompanied by a debug message indicating the reason for the mode's | |
382 | * rejection (see drm_mode_prune_invalid()). | |
6af3e656 VS |
383 | * |
384 | * Returns: | |
385 | * The number of modes found on @connector. | |
386 | */ | |
387 | int drm_helper_probe_single_connector_modes(struct drm_connector *connector, | |
388 | uint32_t maxX, uint32_t maxY) | |
8d754544 DV |
389 | { |
390 | struct drm_device *dev = connector->dev; | |
391 | struct drm_display_mode *mode; | |
be26a66d | 392 | const struct drm_connector_helper_funcs *connector_funcs = |
8d754544 | 393 | connector->helper_private; |
6c5ed5ae | 394 | int count = 0, ret; |
8d754544 DV |
395 | int mode_flags = 0; |
396 | bool verbose_prune = true; | |
162b6a57 | 397 | enum drm_connector_status old_status; |
6c5ed5ae | 398 | struct drm_modeset_acquire_ctx ctx; |
8d754544 DV |
399 | |
400 | WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); | |
401 | ||
6c5ed5ae ML |
402 | drm_modeset_acquire_init(&ctx, 0); |
403 | ||
8d754544 | 404 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, |
25933820 | 405 | connector->name); |
6c5ed5ae ML |
406 | |
407 | retry: | |
408 | ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx); | |
409 | if (ret == -EDEADLK) { | |
410 | drm_modeset_backoff(&ctx); | |
411 | goto retry; | |
412 | } else | |
413 | WARN_ON(ret < 0); | |
414 | ||
5ba89406 | 415 | /* set all old modes to the stale state */ |
8d754544 | 416 | list_for_each_entry(mode, &connector->modes, head) |
5ba89406 | 417 | mode->status = MODE_STALE; |
8d754544 | 418 | |
ed293f77 DV |
419 | old_status = connector->status; |
420 | ||
8d754544 | 421 | if (connector->force) { |
2c4cc91b PH |
422 | if (connector->force == DRM_FORCE_ON || |
423 | connector->force == DRM_FORCE_ON_DIGITAL) | |
8d754544 DV |
424 | connector->status = connector_status_connected; |
425 | else | |
426 | connector->status = connector_status_disconnected; | |
427 | if (connector->funcs->force) | |
428 | connector->funcs->force(connector); | |
429 | } else { | |
6c5ed5ae ML |
430 | ret = drm_helper_probe_detect(connector, &ctx, true); |
431 | ||
432 | if (ret == -EDEADLK) { | |
433 | drm_modeset_backoff(&ctx); | |
434 | goto retry; | |
435 | } else if (WARN(ret < 0, "Invalid return value %i for connector detection\n", ret)) | |
436 | ret = connector_status_unknown; | |
437 | ||
438 | connector->status = ret; | |
ed293f77 DV |
439 | } |
440 | ||
441 | /* | |
442 | * Normally either the driver's hpd code or the poll loop should | |
443 | * pick up any changes and fire the hotplug event. But if | |
444 | * userspace sneaks in a probe, we might miss a change. Hence | |
445 | * check here, and if anything changed start the hotplug code. | |
446 | */ | |
447 | if (old_status != connector->status) { | |
4e15f2a1 | 448 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", |
ed293f77 DV |
449 | connector->base.id, |
450 | connector->name, | |
4e15f2a1 JN |
451 | drm_get_connector_status_name(old_status), |
452 | drm_get_connector_status_name(connector->status)); | |
162b6a57 DV |
453 | |
454 | /* | |
ed293f77 DV |
455 | * The hotplug event code might call into the fb |
456 | * helpers, and so expects that we do not hold any | |
457 | * locks. Fire up the poll struct instead, it will | |
458 | * disable itself again. | |
162b6a57 | 459 | */ |
ed293f77 DV |
460 | dev->mode_config.delayed_event = true; |
461 | if (dev->mode_config.poll_enabled) | |
462 | schedule_delayed_work(&dev->mode_config.output_poll_work, | |
463 | 0); | |
8d754544 DV |
464 | } |
465 | ||
466 | /* Re-enable polling in case the global poll config changed. */ | |
467 | if (drm_kms_helper_poll != dev->mode_config.poll_running) | |
c4d79c22 | 468 | drm_kms_helper_poll_enable(dev); |
8d754544 DV |
469 | |
470 | dev->mode_config.poll_running = drm_kms_helper_poll; | |
471 | ||
472 | if (connector->status == connector_status_disconnected) { | |
473 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n", | |
25933820 | 474 | connector->base.id, connector->name); |
8d754544 DV |
475 | drm_mode_connector_update_edid_property(connector, NULL); |
476 | verbose_prune = false; | |
477 | goto prune; | |
478 | } | |
479 | ||
53fd40a9 | 480 | count = (*connector_funcs->get_modes)(connector); |
8d754544 DV |
481 | |
482 | if (count == 0 && connector->status == connector_status_connected) | |
483 | count = drm_add_modes_noedid(connector, 1024, 768); | |
eaf99c74 | 484 | count += drm_helper_probe_add_cmdline_mode(connector); |
8d754544 DV |
485 | if (count == 0) |
486 | goto prune; | |
487 | ||
6af3e656 | 488 | drm_mode_connector_list_update(connector); |
8d754544 | 489 | |
8d754544 DV |
490 | if (connector->interlace_allowed) |
491 | mode_flags |= DRM_MODE_FLAG_INTERLACE; | |
492 | if (connector->doublescan_allowed) | |
493 | mode_flags |= DRM_MODE_FLAG_DBLSCAN; | |
494 | if (connector->stereo_allowed) | |
495 | mode_flags |= DRM_MODE_FLAG_3D_MASK; | |
8d754544 DV |
496 | |
497 | list_for_each_entry(mode, &connector->modes, head) { | |
be8719a6 | 498 | if (mode->status == MODE_OK) |
75a655e0 | 499 | mode->status = drm_mode_validate_driver(dev, mode); |
abc0b144 VS |
500 | |
501 | if (mode->status == MODE_OK) | |
502 | mode->status = drm_mode_validate_size(mode, maxX, maxY); | |
05acaec3 VS |
503 | |
504 | if (mode->status == MODE_OK) | |
505 | mode->status = drm_mode_validate_flag(mode, mode_flags); | |
506 | ||
97f973d6 JA |
507 | if (mode->status == MODE_OK) |
508 | mode->status = drm_mode_validate_pipeline(mode, | |
509 | connector); | |
d8523153 SS |
510 | |
511 | if (mode->status == MODE_OK) | |
512 | mode->status = drm_mode_validate_ycbcr420(mode, | |
513 | connector); | |
8d754544 DV |
514 | } |
515 | ||
516 | prune: | |
517 | drm_mode_prune_invalid(dev, &connector->modes, verbose_prune); | |
518 | ||
6c5ed5ae ML |
519 | drm_modeset_drop_locks(&ctx); |
520 | drm_modeset_acquire_fini(&ctx); | |
521 | ||
8d754544 DV |
522 | if (list_empty(&connector->modes)) |
523 | return 0; | |
524 | ||
525 | list_for_each_entry(mode, &connector->modes, head) | |
526 | mode->vrefresh = drm_mode_vrefresh(mode); | |
527 | ||
528 | drm_mode_sort(&connector->modes); | |
529 | ||
530 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id, | |
25933820 | 531 | connector->name); |
8d754544 DV |
532 | list_for_each_entry(mode, &connector->modes, head) { |
533 | drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V); | |
534 | drm_mode_debug_printmodeline(mode); | |
535 | } | |
536 | ||
537 | return count; | |
538 | } | |
539 | EXPORT_SYMBOL(drm_helper_probe_single_connector_modes); | |
540 | ||
541 | /** | |
542 | * drm_kms_helper_hotplug_event - fire off KMS hotplug events | |
543 | * @dev: drm_device whose connector state changed | |
544 | * | |
545 | * This function fires off the uevent for userspace and also calls the | |
546 | * output_poll_changed function, which is most commonly used to inform the fbdev | |
547 | * emulation code and allow it to update the fbcon output configuration. | |
548 | * | |
549 | * Drivers should call this from their hotplug handling code when a change is | |
550 | * detected. Note that this function does not do any output detection of its | |
551 | * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the | |
552 | * driver already. | |
553 | * | |
554 | * This function must be called from process context with no mode | |
555 | * setting locks held. | |
556 | */ | |
557 | void drm_kms_helper_hotplug_event(struct drm_device *dev) | |
558 | { | |
559 | /* send a uevent + call fbdev */ | |
560 | drm_sysfs_hotplug_event(dev); | |
561 | if (dev->mode_config.funcs->output_poll_changed) | |
562 | dev->mode_config.funcs->output_poll_changed(dev); | |
c76f0f7c NT |
563 | |
564 | drm_client_dev_hotplug(dev); | |
8d754544 DV |
565 | } |
566 | EXPORT_SYMBOL(drm_kms_helper_hotplug_event); | |
567 | ||
8d754544 DV |
568 | static void output_poll_execute(struct work_struct *work) |
569 | { | |
570 | struct delayed_work *delayed_work = to_delayed_work(work); | |
571 | struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work); | |
572 | struct drm_connector *connector; | |
c36a3254 | 573 | struct drm_connector_list_iter conn_iter; |
8d754544 | 574 | enum drm_connector_status old_status; |
162b6a57 DV |
575 | bool repoll = false, changed; |
576 | ||
577 | /* Pick up any changes detected by the probe functions. */ | |
578 | changed = dev->mode_config.delayed_event; | |
579 | dev->mode_config.delayed_event = false; | |
8d754544 DV |
580 | |
581 | if (!drm_kms_helper_poll) | |
162b6a57 | 582 | goto out; |
8d754544 | 583 | |
1fe7841d CW |
584 | if (!mutex_trylock(&dev->mode_config.mutex)) { |
585 | repoll = true; | |
586 | goto out; | |
587 | } | |
588 | ||
b982dab1 | 589 | drm_connector_list_iter_begin(dev, &conn_iter); |
c36a3254 | 590 | drm_for_each_connector_iter(connector, &conn_iter) { |
8d754544 DV |
591 | /* Ignore forced connectors. */ |
592 | if (connector->force) | |
593 | continue; | |
594 | ||
595 | /* Ignore HPD capable connectors and connectors where we don't | |
596 | * want any hotplug detection at all for polling. */ | |
597 | if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD) | |
598 | continue; | |
599 | ||
8d754544 DV |
600 | old_status = connector->status; |
601 | /* if we are connected and don't want to poll for disconnect | |
602 | skip it */ | |
603 | if (old_status == connector_status_connected && | |
604 | !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT)) | |
605 | continue; | |
606 | ||
a3c6d686 JH |
607 | repoll = true; |
608 | ||
6c5ed5ae | 609 | connector->status = drm_helper_probe_detect(connector, NULL, false); |
8d754544 DV |
610 | if (old_status != connector->status) { |
611 | const char *old, *new; | |
612 | ||
b7703726 DV |
613 | /* |
614 | * The poll work sets force=false when calling detect so | |
615 | * that drivers can avoid to do disruptive tests (e.g. | |
616 | * when load detect cycles could cause flickering on | |
617 | * other, running displays). This bears the risk that we | |
618 | * flip-flop between unknown here in the poll work and | |
619 | * the real state when userspace forces a full detect | |
620 | * call after receiving a hotplug event due to this | |
621 | * change. | |
622 | * | |
623 | * Hence clamp an unknown detect status to the old | |
624 | * value. | |
625 | */ | |
626 | if (connector->status == connector_status_unknown) { | |
627 | connector->status = old_status; | |
628 | continue; | |
629 | } | |
630 | ||
8d754544 DV |
631 | old = drm_get_connector_status_name(old_status); |
632 | new = drm_get_connector_status_name(connector->status); | |
633 | ||
634 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] " | |
635 | "status updated from %s to %s\n", | |
636 | connector->base.id, | |
25933820 | 637 | connector->name, |
8d754544 DV |
638 | old, new); |
639 | ||
640 | changed = true; | |
641 | } | |
642 | } | |
b982dab1 | 643 | drm_connector_list_iter_end(&conn_iter); |
8d754544 DV |
644 | |
645 | mutex_unlock(&dev->mode_config.mutex); | |
646 | ||
162b6a57 | 647 | out: |
8d754544 DV |
648 | if (changed) |
649 | drm_kms_helper_hotplug_event(dev); | |
650 | ||
651 | if (repoll) | |
652 | schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD); | |
653 | } | |
654 | ||
25c058cc LW |
655 | /** |
656 | * drm_kms_helper_is_poll_worker - is %current task an output poll worker? | |
657 | * | |
658 | * Determine if %current task is an output poll worker. This can be used | |
659 | * to select distinct code paths for output polling versus other contexts. | |
660 | * | |
661 | * One use case is to avoid a deadlock between the output poll worker and | |
662 | * the autosuspend worker wherein the latter waits for polling to finish | |
663 | * upon calling drm_kms_helper_poll_disable(), while the former waits for | |
664 | * runtime suspend to finish upon calling pm_runtime_get_sync() in a | |
665 | * connector ->detect hook. | |
666 | */ | |
667 | bool drm_kms_helper_is_poll_worker(void) | |
668 | { | |
669 | struct work_struct *work = current_work(); | |
670 | ||
671 | return work && work->func == output_poll_execute; | |
672 | } | |
673 | EXPORT_SYMBOL(drm_kms_helper_is_poll_worker); | |
674 | ||
8d754544 DV |
675 | /** |
676 | * drm_kms_helper_poll_disable - disable output polling | |
677 | * @dev: drm_device | |
678 | * | |
679 | * This function disables the output polling work. | |
680 | * | |
681 | * Drivers can call this helper from their device suspend implementation. It is | |
c4d79c22 DA |
682 | * not an error to call this even when output polling isn't enabled or already |
683 | * disabled. Polling is re-enabled by calling drm_kms_helper_poll_enable(). | |
684 | * | |
685 | * Note that calls to enable and disable polling must be strictly ordered, which | |
686 | * is automatically the case when they're only call from suspend/resume | |
687 | * callbacks. | |
8d754544 DV |
688 | */ |
689 | void drm_kms_helper_poll_disable(struct drm_device *dev) | |
690 | { | |
691 | if (!dev->mode_config.poll_enabled) | |
692 | return; | |
693 | cancel_delayed_work_sync(&dev->mode_config.output_poll_work); | |
694 | } | |
695 | EXPORT_SYMBOL(drm_kms_helper_poll_disable); | |
696 | ||
8d754544 DV |
697 | /** |
698 | * drm_kms_helper_poll_init - initialize and enable output polling | |
699 | * @dev: drm_device | |
700 | * | |
701 | * This function intializes and then also enables output polling support for | |
702 | * @dev. Drivers which do not have reliable hotplug support in hardware can use | |
703 | * this helper infrastructure to regularly poll such connectors for changes in | |
704 | * their connection state. | |
705 | * | |
706 | * Drivers can control which connectors are polled by setting the | |
707 | * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On | |
708 | * connectors where probing live outputs can result in visual distortion drivers | |
709 | * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this. | |
710 | * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are | |
711 | * completely ignored by the polling logic. | |
712 | * | |
713 | * Note that a connector can be both polled and probed from the hotplug handler, | |
714 | * in case the hotplug interrupt is known to be unreliable. | |
715 | */ | |
716 | void drm_kms_helper_poll_init(struct drm_device *dev) | |
717 | { | |
718 | INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute); | |
719 | dev->mode_config.poll_enabled = true; | |
720 | ||
721 | drm_kms_helper_poll_enable(dev); | |
722 | } | |
723 | EXPORT_SYMBOL(drm_kms_helper_poll_init); | |
724 | ||
725 | /** | |
726 | * drm_kms_helper_poll_fini - disable output polling and clean it up | |
727 | * @dev: drm_device | |
728 | */ | |
729 | void drm_kms_helper_poll_fini(struct drm_device *dev) | |
730 | { | |
731 | drm_kms_helper_poll_disable(dev); | |
732 | } | |
733 | EXPORT_SYMBOL(drm_kms_helper_poll_fini); | |
734 | ||
735 | /** | |
736 | * drm_helper_hpd_irq_event - hotplug processing | |
737 | * @dev: drm_device | |
738 | * | |
739 | * Drivers can use this helper function to run a detect cycle on all connectors | |
740 | * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All | |
741 | * other connectors are ignored, which is useful to avoid reprobing fixed | |
742 | * panels. | |
743 | * | |
744 | * This helper function is useful for drivers which can't or don't track hotplug | |
745 | * interrupts for each connector. | |
746 | * | |
747 | * Drivers which support hotplug interrupts for each connector individually and | |
748 | * which have a more fine-grained detect logic should bypass this code and | |
749 | * directly call drm_kms_helper_hotplug_event() in case the connector state | |
750 | * changed. | |
751 | * | |
752 | * This function must be called from process context with no mode | |
753 | * setting locks held. | |
754 | * | |
755 | * Note that a connector can be both polled and probed from the hotplug handler, | |
756 | * in case the hotplug interrupt is known to be unreliable. | |
757 | */ | |
758 | bool drm_helper_hpd_irq_event(struct drm_device *dev) | |
759 | { | |
760 | struct drm_connector *connector; | |
c36a3254 | 761 | struct drm_connector_list_iter conn_iter; |
8d754544 DV |
762 | enum drm_connector_status old_status; |
763 | bool changed = false; | |
764 | ||
765 | if (!dev->mode_config.poll_enabled) | |
766 | return false; | |
767 | ||
768 | mutex_lock(&dev->mode_config.mutex); | |
b982dab1 | 769 | drm_connector_list_iter_begin(dev, &conn_iter); |
c36a3254 | 770 | drm_for_each_connector_iter(connector, &conn_iter) { |
8d754544 DV |
771 | /* Only handle HPD capable connectors. */ |
772 | if (!(connector->polled & DRM_CONNECTOR_POLL_HPD)) | |
773 | continue; | |
774 | ||
775 | old_status = connector->status; | |
776 | ||
6c5ed5ae | 777 | connector->status = drm_helper_probe_detect(connector, NULL, false); |
8d754544 DV |
778 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", |
779 | connector->base.id, | |
25933820 | 780 | connector->name, |
8d754544 DV |
781 | drm_get_connector_status_name(old_status), |
782 | drm_get_connector_status_name(connector->status)); | |
783 | if (old_status != connector->status) | |
784 | changed = true; | |
785 | } | |
b982dab1 | 786 | drm_connector_list_iter_end(&conn_iter); |
8d754544 DV |
787 | mutex_unlock(&dev->mode_config.mutex); |
788 | ||
789 | if (changed) | |
790 | drm_kms_helper_hotplug_event(dev); | |
791 | ||
792 | return changed; | |
793 | } | |
794 | EXPORT_SYMBOL(drm_helper_hpd_irq_event); |