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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 | ||
ee68c743 | 35 | #include <drm/drm_bridge.h> |
c76f0f7c | 36 | #include <drm/drm_client.h> |
8d754544 | 37 | #include <drm/drm_crtc.h> |
8d754544 | 38 | #include <drm/drm_edid.h> |
0500c04e SR |
39 | #include <drm/drm_fb_helper.h> |
40 | #include <drm/drm_fourcc.h> | |
da251bf8 | 41 | #include <drm/drm_modeset_helper_vtables.h> |
0500c04e | 42 | #include <drm/drm_print.h> |
fcd70cd3 | 43 | #include <drm/drm_probe_helper.h> |
0500c04e | 44 | #include <drm/drm_sysfs.h> |
da251bf8 JA |
45 | |
46 | #include "drm_crtc_helper_internal.h" | |
8d754544 DV |
47 | |
48 | /** | |
49 | * DOC: output probing helper overview | |
50 | * | |
51 | * This library provides some helper code for output probing. It provides an | |
6806cdf9 | 52 | * implementation of the core &drm_connector_funcs.fill_modes interface with |
1bbfe9d1 | 53 | * drm_helper_probe_single_connector_modes(). |
8d754544 DV |
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. | |
092d01da DV |
62 | * |
63 | * The probe helpers share the function table structures with other display | |
ea0dd85a | 64 | * helper libraries. See &struct drm_connector_helper_funcs for the details. |
8d754544 DV |
65 | */ |
66 | ||
67 | static bool drm_kms_helper_poll = true; | |
68 | module_param_named(poll, drm_kms_helper_poll, bool, 0600); | |
69 | ||
05acaec3 VS |
70 | static enum drm_mode_status |
71 | drm_mode_validate_flag(const struct drm_display_mode *mode, | |
72 | int flags) | |
8d754544 | 73 | { |
05acaec3 VS |
74 | if ((mode->flags & DRM_MODE_FLAG_INTERLACE) && |
75 | !(flags & DRM_MODE_FLAG_INTERLACE)) | |
76 | return MODE_NO_INTERLACE; | |
8d754544 | 77 | |
05acaec3 VS |
78 | if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) && |
79 | !(flags & DRM_MODE_FLAG_DBLSCAN)) | |
80 | return MODE_NO_DBLESCAN; | |
8d754544 | 81 | |
05acaec3 VS |
82 | if ((mode->flags & DRM_MODE_FLAG_3D_MASK) && |
83 | !(flags & DRM_MODE_FLAG_3D_MASK)) | |
84 | return MODE_NO_STEREO; | |
8d754544 | 85 | |
05acaec3 | 86 | return MODE_OK; |
8d754544 DV |
87 | } |
88 | ||
97f973d6 JA |
89 | static enum drm_mode_status |
90 | drm_mode_validate_pipeline(struct drm_display_mode *mode, | |
91 | struct drm_connector *connector) | |
92 | { | |
93 | struct drm_device *dev = connector->dev; | |
97f973d6 | 94 | enum drm_mode_status ret = MODE_OK; |
83aefbb8 | 95 | struct drm_encoder *encoder; |
97f973d6 JA |
96 | |
97 | /* Step 1: Validate against connector */ | |
98 | ret = drm_connector_mode_valid(connector, mode); | |
99 | if (ret != MODE_OK) | |
100 | return ret; | |
101 | ||
102 | /* Step 2: Validate against encoders and crtcs */ | |
62afb4ad | 103 | drm_connector_for_each_possible_encoder(connector, encoder) { |
35a61fe9 | 104 | struct drm_bridge *bridge; |
97f973d6 JA |
105 | struct drm_crtc *crtc; |
106 | ||
97f973d6 JA |
107 | ret = drm_encoder_mode_valid(encoder, mode); |
108 | 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 | continue; | |
114 | } | |
115 | ||
35a61fe9 BB |
116 | bridge = drm_bridge_chain_get_first_bridge(encoder); |
117 | ret = drm_bridge_chain_mode_valid(bridge, mode); | |
97f973d6 JA |
118 | if (ret != MODE_OK) { |
119 | /* There is also no point in continuing for crtc check | |
120 | * here. */ | |
121 | continue; | |
122 | } | |
123 | ||
124 | drm_for_each_crtc(crtc, dev) { | |
125 | if (!drm_encoder_crtc_ok(encoder, crtc)) | |
126 | continue; | |
127 | ||
128 | ret = drm_crtc_mode_valid(crtc, mode); | |
129 | 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 | return ret; | |
134 | } | |
135 | } | |
136 | } | |
137 | ||
138 | return ret; | |
139 | } | |
140 | ||
eaf99c74 CW |
141 | static int drm_helper_probe_add_cmdline_mode(struct drm_connector *connector) |
142 | { | |
5f0c3f99 | 143 | struct drm_cmdline_mode *cmdline_mode; |
eaf99c74 CW |
144 | struct drm_display_mode *mode; |
145 | ||
5f0c3f99 CW |
146 | cmdline_mode = &connector->cmdline_mode; |
147 | if (!cmdline_mode->specified) | |
eaf99c74 CW |
148 | return 0; |
149 | ||
5f0c3f99 CW |
150 | /* Only add a GTF mode if we find no matching probed modes */ |
151 | list_for_each_entry(mode, &connector->probed_modes, head) { | |
152 | if (mode->hdisplay != cmdline_mode->xres || | |
153 | mode->vdisplay != cmdline_mode->yres) | |
154 | continue; | |
155 | ||
156 | if (cmdline_mode->refresh_specified) { | |
157 | /* The probed mode's vrefresh is set until later */ | |
158 | if (drm_mode_vrefresh(mode) != cmdline_mode->refresh) | |
159 | continue; | |
160 | } | |
161 | ||
ebdc02dd HG |
162 | /* Mark the matching mode as being preferred by the user */ |
163 | mode->type |= DRM_MODE_TYPE_USERDEF; | |
5f0c3f99 CW |
164 | return 0; |
165 | } | |
166 | ||
eaf99c74 | 167 | mode = drm_mode_create_from_cmdline_mode(connector->dev, |
5f0c3f99 | 168 | cmdline_mode); |
eaf99c74 CW |
169 | if (mode == NULL) |
170 | return 0; | |
171 | ||
172 | drm_mode_probed_add(connector, mode); | |
173 | return 1; | |
174 | } | |
175 | ||
da251bf8 JA |
176 | enum drm_mode_status drm_crtc_mode_valid(struct drm_crtc *crtc, |
177 | const struct drm_display_mode *mode) | |
178 | { | |
179 | const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; | |
180 | ||
181 | if (!crtc_funcs || !crtc_funcs->mode_valid) | |
182 | return MODE_OK; | |
183 | ||
184 | return crtc_funcs->mode_valid(crtc, mode); | |
185 | } | |
186 | ||
187 | enum drm_mode_status drm_encoder_mode_valid(struct drm_encoder *encoder, | |
188 | const struct drm_display_mode *mode) | |
189 | { | |
190 | const struct drm_encoder_helper_funcs *encoder_funcs = | |
191 | encoder->helper_private; | |
192 | ||
193 | if (!encoder_funcs || !encoder_funcs->mode_valid) | |
194 | return MODE_OK; | |
195 | ||
196 | return encoder_funcs->mode_valid(encoder, mode); | |
197 | } | |
198 | ||
199 | enum drm_mode_status drm_connector_mode_valid(struct drm_connector *connector, | |
200 | struct drm_display_mode *mode) | |
201 | { | |
202 | const struct drm_connector_helper_funcs *connector_funcs = | |
203 | connector->helper_private; | |
204 | ||
205 | if (!connector_funcs || !connector_funcs->mode_valid) | |
206 | return MODE_OK; | |
207 | ||
208 | return connector_funcs->mode_valid(connector, mode); | |
209 | } | |
210 | ||
8c4ccc4a | 211 | #define DRM_OUTPUT_POLL_PERIOD (10*HZ) |
4ad640e9 | 212 | /** |
c4d79c22 | 213 | * drm_kms_helper_poll_enable - re-enable output polling. |
4ad640e9 EE |
214 | * @dev: drm_device |
215 | * | |
c4d79c22 DA |
216 | * This function re-enables the output polling work, after it has been |
217 | * temporarily disabled using drm_kms_helper_poll_disable(), for example over | |
218 | * suspend/resume. | |
4ad640e9 | 219 | * |
c4d79c22 | 220 | * Drivers can call this helper from their device resume implementation. It is |
b66d0f34 | 221 | * not an error to call this even when output polling isn't enabled. |
c4d79c22 DA |
222 | * |
223 | * Note that calls to enable and disable polling must be strictly ordered, which | |
224 | * is automatically the case when they're only call from suspend/resume | |
225 | * callbacks. | |
4ad640e9 | 226 | */ |
c4d79c22 | 227 | void drm_kms_helper_poll_enable(struct drm_device *dev) |
8c4ccc4a DV |
228 | { |
229 | bool poll = false; | |
230 | struct drm_connector *connector; | |
c36a3254 | 231 | struct drm_connector_list_iter conn_iter; |
339fd362 | 232 | unsigned long delay = DRM_OUTPUT_POLL_PERIOD; |
8c4ccc4a | 233 | |
8c4ccc4a DV |
234 | if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll) |
235 | return; | |
236 | ||
b982dab1 | 237 | drm_connector_list_iter_begin(dev, &conn_iter); |
c36a3254 | 238 | drm_for_each_connector_iter(connector, &conn_iter) { |
8c4ccc4a DV |
239 | if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | |
240 | DRM_CONNECTOR_POLL_DISCONNECT)) | |
241 | poll = true; | |
242 | } | |
b982dab1 | 243 | drm_connector_list_iter_end(&conn_iter); |
8c4ccc4a | 244 | |
339fd362 | 245 | if (dev->mode_config.delayed_event) { |
68f458ee PU |
246 | /* |
247 | * FIXME: | |
248 | * | |
249 | * Use short (1s) delay to handle the initial delayed event. | |
250 | * This delay should not be needed, but Optimus/nouveau will | |
251 | * fail in a mysterious way if the delayed event is handled as | |
252 | * soon as possible like it is done in | |
253 | * drm_helper_probe_single_connector_modes() in case the poll | |
254 | * was enabled before. | |
255 | */ | |
339fd362 | 256 | poll = true; |
68f458ee | 257 | delay = HZ; |
339fd362 PU |
258 | } |
259 | ||
8c4ccc4a | 260 | if (poll) |
339fd362 | 261 | schedule_delayed_work(&dev->mode_config.output_poll_work, delay); |
8c4ccc4a | 262 | } |
c4d79c22 | 263 | EXPORT_SYMBOL(drm_kms_helper_poll_enable); |
4ad640e9 | 264 | |
949f0886 | 265 | static enum drm_connector_status |
6c5ed5ae | 266 | drm_helper_probe_detect_ctx(struct drm_connector *connector, bool force) |
949f0886 | 267 | { |
6c5ed5ae ML |
268 | const struct drm_connector_helper_funcs *funcs = connector->helper_private; |
269 | struct drm_modeset_acquire_ctx ctx; | |
270 | int ret; | |
271 | ||
272 | drm_modeset_acquire_init(&ctx, 0); | |
273 | ||
274 | retry: | |
275 | ret = drm_modeset_lock(&connector->dev->mode_config.connection_mutex, &ctx); | |
276 | if (!ret) { | |
277 | if (funcs->detect_ctx) | |
278 | ret = funcs->detect_ctx(connector, &ctx, force); | |
279 | else if (connector->funcs->detect) | |
280 | ret = connector->funcs->detect(connector, force); | |
281 | else | |
282 | ret = connector_status_connected; | |
283 | } | |
284 | ||
285 | if (ret == -EDEADLK) { | |
286 | drm_modeset_backoff(&ctx); | |
287 | goto retry; | |
288 | } | |
289 | ||
290 | if (WARN_ON(ret < 0)) | |
291 | ret = connector_status_unknown; | |
292 | ||
293 | drm_modeset_drop_locks(&ctx); | |
294 | drm_modeset_acquire_fini(&ctx); | |
295 | ||
296 | return ret; | |
297 | } | |
298 | ||
299 | /** | |
300 | * drm_helper_probe_detect - probe connector status | |
301 | * @connector: connector to probe | |
302 | * @ctx: acquire_ctx, or NULL to let this function handle locking. | |
303 | * @force: Whether destructive probe operations should be performed. | |
304 | * | |
305 | * This function calls the detect callbacks of the connector. | |
306 | * This function returns &drm_connector_status, or | |
307 | * if @ctx is set, it might also return -EDEADLK. | |
308 | */ | |
309 | int | |
310 | drm_helper_probe_detect(struct drm_connector *connector, | |
311 | struct drm_modeset_acquire_ctx *ctx, | |
312 | bool force) | |
313 | { | |
314 | const struct drm_connector_helper_funcs *funcs = connector->helper_private; | |
315 | struct drm_device *dev = connector->dev; | |
316 | int ret; | |
317 | ||
318 | if (!ctx) | |
319 | return drm_helper_probe_detect_ctx(connector, force); | |
320 | ||
321 | ret = drm_modeset_lock(&dev->mode_config.connection_mutex, ctx); | |
322 | if (ret) | |
323 | return ret; | |
324 | ||
325 | if (funcs->detect_ctx) | |
326 | return funcs->detect_ctx(connector, ctx, force); | |
327 | else if (connector->funcs->detect) | |
328 | return connector->funcs->detect(connector, force); | |
329 | else | |
330 | return connector_status_connected; | |
949f0886 | 331 | } |
6c5ed5ae | 332 | EXPORT_SYMBOL(drm_helper_probe_detect); |
949f0886 | 333 | |
6af3e656 VS |
334 | /** |
335 | * drm_helper_probe_single_connector_modes - get complete set of display modes | |
336 | * @connector: connector to probe | |
337 | * @maxX: max width for modes | |
338 | * @maxY: max height for modes | |
339 | * | |
340 | * Based on the helper callbacks implemented by @connector in struct | |
341 | * &drm_connector_helper_funcs try to detect all valid modes. Modes will first | |
342 | * be added to the connector's probed_modes list, then culled (based on validity | |
343 | * and the @maxX, @maxY parameters) and put into the normal modes list. | |
344 | * | |
6806cdf9 DV |
345 | * Intended to be used as a generic implementation of the |
346 | * &drm_connector_funcs.fill_modes() vfunc for drivers that use the CRTC helpers | |
347 | * for output mode filtering and detection. | |
6af3e656 | 348 | * |
5dec293b VS |
349 | * The basic procedure is as follows |
350 | * | |
351 | * 1. All modes currently on the connector's modes list are marked as stale | |
352 | * | |
353 | * 2. New modes are added to the connector's probed_modes list with | |
354 | * drm_mode_probed_add(). New modes start their life with status as OK. | |
355 | * Modes are added from a single source using the following priority order. | |
356 | * | |
6806cdf9 | 357 | * - &drm_connector_helper_funcs.get_modes vfunc |
5dec293b VS |
358 | * - if the connector status is connector_status_connected, standard |
359 | * VESA DMT modes up to 1024x768 are automatically added | |
360 | * (drm_add_modes_noedid()) | |
361 | * | |
362 | * Finally modes specified via the kernel command line (video=...) are | |
363 | * added in addition to what the earlier probes produced | |
364 | * (drm_helper_probe_add_cmdline_mode()). These modes are generated | |
365 | * using the VESA GTF/CVT formulas. | |
366 | * | |
367 | * 3. Modes are moved from the probed_modes list to the modes list. Potential | |
97e14fbe | 368 | * duplicates are merged together (see drm_connector_list_update()). |
5dec293b VS |
369 | * After this step the probed_modes list will be empty again. |
370 | * | |
371 | * 4. Any non-stale mode on the modes list then undergoes validation | |
372 | * | |
373 | * - drm_mode_validate_basic() performs basic sanity checks | |
374 | * - drm_mode_validate_size() filters out modes larger than @maxX and @maxY | |
375 | * (if specified) | |
57366a8d MY |
376 | * - drm_mode_validate_flag() checks the modes against basic connector |
377 | * capabilities (interlace_allowed,doublescan_allowed,stereo_allowed) | |
6806cdf9 | 378 | * - the optional &drm_connector_helper_funcs.mode_valid helper can perform |
97f973d6 JA |
379 | * driver and/or sink specific checks |
380 | * - the optional &drm_crtc_helper_funcs.mode_valid, | |
381 | * &drm_bridge_funcs.mode_valid and &drm_encoder_helper_funcs.mode_valid | |
382 | * helpers can perform driver and/or source specific checks which are also | |
383 | * enforced by the modeset/atomic helpers | |
5dec293b VS |
384 | * |
385 | * 5. Any mode whose status is not OK is pruned from the connector's modes list, | |
386 | * accompanied by a debug message indicating the reason for the mode's | |
387 | * rejection (see drm_mode_prune_invalid()). | |
6af3e656 VS |
388 | * |
389 | * Returns: | |
390 | * The number of modes found on @connector. | |
391 | */ | |
392 | int drm_helper_probe_single_connector_modes(struct drm_connector *connector, | |
393 | uint32_t maxX, uint32_t maxY) | |
8d754544 DV |
394 | { |
395 | struct drm_device *dev = connector->dev; | |
396 | struct drm_display_mode *mode; | |
be26a66d | 397 | const struct drm_connector_helper_funcs *connector_funcs = |
8d754544 | 398 | connector->helper_private; |
6c5ed5ae | 399 | int count = 0, ret; |
8d754544 DV |
400 | int mode_flags = 0; |
401 | bool verbose_prune = true; | |
162b6a57 | 402 | enum drm_connector_status old_status; |
6c5ed5ae | 403 | struct drm_modeset_acquire_ctx ctx; |
8d754544 DV |
404 | |
405 | WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); | |
406 | ||
6c5ed5ae ML |
407 | drm_modeset_acquire_init(&ctx, 0); |
408 | ||
8d754544 | 409 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, |
25933820 | 410 | connector->name); |
6c5ed5ae ML |
411 | |
412 | retry: | |
413 | ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx); | |
414 | if (ret == -EDEADLK) { | |
415 | drm_modeset_backoff(&ctx); | |
416 | goto retry; | |
417 | } else | |
418 | WARN_ON(ret < 0); | |
419 | ||
5ba89406 | 420 | /* set all old modes to the stale state */ |
8d754544 | 421 | list_for_each_entry(mode, &connector->modes, head) |
5ba89406 | 422 | mode->status = MODE_STALE; |
8d754544 | 423 | |
ed293f77 DV |
424 | old_status = connector->status; |
425 | ||
8d754544 | 426 | if (connector->force) { |
2c4cc91b PH |
427 | if (connector->force == DRM_FORCE_ON || |
428 | connector->force == DRM_FORCE_ON_DIGITAL) | |
8d754544 DV |
429 | connector->status = connector_status_connected; |
430 | else | |
431 | connector->status = connector_status_disconnected; | |
432 | if (connector->funcs->force) | |
433 | connector->funcs->force(connector); | |
434 | } else { | |
6c5ed5ae ML |
435 | ret = drm_helper_probe_detect(connector, &ctx, true); |
436 | ||
437 | if (ret == -EDEADLK) { | |
438 | drm_modeset_backoff(&ctx); | |
439 | goto retry; | |
440 | } else if (WARN(ret < 0, "Invalid return value %i for connector detection\n", ret)) | |
441 | ret = connector_status_unknown; | |
442 | ||
443 | connector->status = ret; | |
ed293f77 DV |
444 | } |
445 | ||
446 | /* | |
447 | * Normally either the driver's hpd code or the poll loop should | |
448 | * pick up any changes and fire the hotplug event. But if | |
449 | * userspace sneaks in a probe, we might miss a change. Hence | |
450 | * check here, and if anything changed start the hotplug code. | |
451 | */ | |
452 | if (old_status != connector->status) { | |
4e15f2a1 | 453 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", |
ed293f77 DV |
454 | connector->base.id, |
455 | connector->name, | |
4e15f2a1 JN |
456 | drm_get_connector_status_name(old_status), |
457 | drm_get_connector_status_name(connector->status)); | |
162b6a57 DV |
458 | |
459 | /* | |
ed293f77 DV |
460 | * The hotplug event code might call into the fb |
461 | * helpers, and so expects that we do not hold any | |
462 | * locks. Fire up the poll struct instead, it will | |
463 | * disable itself again. | |
162b6a57 | 464 | */ |
ed293f77 DV |
465 | dev->mode_config.delayed_event = true; |
466 | if (dev->mode_config.poll_enabled) | |
467 | schedule_delayed_work(&dev->mode_config.output_poll_work, | |
468 | 0); | |
8d754544 DV |
469 | } |
470 | ||
471 | /* Re-enable polling in case the global poll config changed. */ | |
472 | if (drm_kms_helper_poll != dev->mode_config.poll_running) | |
c4d79c22 | 473 | drm_kms_helper_poll_enable(dev); |
8d754544 DV |
474 | |
475 | dev->mode_config.poll_running = drm_kms_helper_poll; | |
476 | ||
477 | if (connector->status == connector_status_disconnected) { | |
478 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n", | |
25933820 | 479 | connector->base.id, connector->name); |
c555f023 | 480 | drm_connector_update_edid_property(connector, NULL); |
8d754544 DV |
481 | verbose_prune = false; |
482 | goto prune; | |
483 | } | |
484 | ||
53fd40a9 | 485 | count = (*connector_funcs->get_modes)(connector); |
8d754544 | 486 | |
48eaeb76 JN |
487 | /* |
488 | * Fallback for when DDC probe failed in drm_get_edid() and thus skipped | |
489 | * override/firmware EDID. | |
490 | */ | |
491 | if (count == 0 && connector->status == connector_status_connected) | |
492 | count = drm_add_override_edid_modes(connector); | |
493 | ||
8d754544 DV |
494 | if (count == 0 && connector->status == connector_status_connected) |
495 | count = drm_add_modes_noedid(connector, 1024, 768); | |
eaf99c74 | 496 | count += drm_helper_probe_add_cmdline_mode(connector); |
8d754544 DV |
497 | if (count == 0) |
498 | goto prune; | |
499 | ||
97e14fbe | 500 | drm_connector_list_update(connector); |
8d754544 | 501 | |
8d754544 DV |
502 | if (connector->interlace_allowed) |
503 | mode_flags |= DRM_MODE_FLAG_INTERLACE; | |
504 | if (connector->doublescan_allowed) | |
505 | mode_flags |= DRM_MODE_FLAG_DBLSCAN; | |
506 | if (connector->stereo_allowed) | |
507 | mode_flags |= DRM_MODE_FLAG_3D_MASK; | |
8d754544 DV |
508 | |
509 | list_for_each_entry(mode, &connector->modes, head) { | |
be8719a6 | 510 | if (mode->status == MODE_OK) |
75a655e0 | 511 | mode->status = drm_mode_validate_driver(dev, mode); |
abc0b144 VS |
512 | |
513 | if (mode->status == MODE_OK) | |
514 | mode->status = drm_mode_validate_size(mode, maxX, maxY); | |
05acaec3 VS |
515 | |
516 | if (mode->status == MODE_OK) | |
517 | mode->status = drm_mode_validate_flag(mode, mode_flags); | |
518 | ||
97f973d6 JA |
519 | if (mode->status == MODE_OK) |
520 | mode->status = drm_mode_validate_pipeline(mode, | |
521 | connector); | |
d8523153 SS |
522 | |
523 | if (mode->status == MODE_OK) | |
524 | mode->status = drm_mode_validate_ycbcr420(mode, | |
525 | connector); | |
8d754544 DV |
526 | } |
527 | ||
528 | prune: | |
529 | drm_mode_prune_invalid(dev, &connector->modes, verbose_prune); | |
530 | ||
6c5ed5ae ML |
531 | drm_modeset_drop_locks(&ctx); |
532 | drm_modeset_acquire_fini(&ctx); | |
533 | ||
8d754544 DV |
534 | if (list_empty(&connector->modes)) |
535 | return 0; | |
536 | ||
8d754544 DV |
537 | drm_mode_sort(&connector->modes); |
538 | ||
539 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id, | |
25933820 | 540 | connector->name); |
8d754544 DV |
541 | list_for_each_entry(mode, &connector->modes, head) { |
542 | drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V); | |
543 | drm_mode_debug_printmodeline(mode); | |
544 | } | |
545 | ||
546 | return count; | |
547 | } | |
548 | EXPORT_SYMBOL(drm_helper_probe_single_connector_modes); | |
549 | ||
550 | /** | |
551 | * drm_kms_helper_hotplug_event - fire off KMS hotplug events | |
552 | * @dev: drm_device whose connector state changed | |
553 | * | |
554 | * This function fires off the uevent for userspace and also calls the | |
555 | * output_poll_changed function, which is most commonly used to inform the fbdev | |
556 | * emulation code and allow it to update the fbcon output configuration. | |
557 | * | |
558 | * Drivers should call this from their hotplug handling code when a change is | |
559 | * detected. Note that this function does not do any output detection of its | |
560 | * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the | |
561 | * driver already. | |
562 | * | |
563 | * This function must be called from process context with no mode | |
564 | * setting locks held. | |
565 | */ | |
566 | void drm_kms_helper_hotplug_event(struct drm_device *dev) | |
567 | { | |
568 | /* send a uevent + call fbdev */ | |
569 | drm_sysfs_hotplug_event(dev); | |
570 | if (dev->mode_config.funcs->output_poll_changed) | |
571 | dev->mode_config.funcs->output_poll_changed(dev); | |
c76f0f7c NT |
572 | |
573 | drm_client_dev_hotplug(dev); | |
8d754544 DV |
574 | } |
575 | EXPORT_SYMBOL(drm_kms_helper_hotplug_event); | |
576 | ||
8d754544 DV |
577 | static void output_poll_execute(struct work_struct *work) |
578 | { | |
579 | struct delayed_work *delayed_work = to_delayed_work(work); | |
580 | struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work); | |
581 | struct drm_connector *connector; | |
c36a3254 | 582 | struct drm_connector_list_iter conn_iter; |
8d754544 | 583 | enum drm_connector_status old_status; |
162b6a57 DV |
584 | bool repoll = false, changed; |
585 | ||
3b295cb1 CW |
586 | if (!dev->mode_config.poll_enabled) |
587 | return; | |
588 | ||
162b6a57 DV |
589 | /* Pick up any changes detected by the probe functions. */ |
590 | changed = dev->mode_config.delayed_event; | |
591 | dev->mode_config.delayed_event = false; | |
8d754544 DV |
592 | |
593 | if (!drm_kms_helper_poll) | |
162b6a57 | 594 | goto out; |
8d754544 | 595 | |
1fe7841d CW |
596 | if (!mutex_trylock(&dev->mode_config.mutex)) { |
597 | repoll = true; | |
598 | goto out; | |
599 | } | |
600 | ||
b982dab1 | 601 | drm_connector_list_iter_begin(dev, &conn_iter); |
c36a3254 | 602 | drm_for_each_connector_iter(connector, &conn_iter) { |
8d754544 DV |
603 | /* Ignore forced connectors. */ |
604 | if (connector->force) | |
605 | continue; | |
606 | ||
607 | /* Ignore HPD capable connectors and connectors where we don't | |
608 | * want any hotplug detection at all for polling. */ | |
609 | if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD) | |
610 | continue; | |
611 | ||
8d754544 DV |
612 | old_status = connector->status; |
613 | /* if we are connected and don't want to poll for disconnect | |
614 | skip it */ | |
615 | if (old_status == connector_status_connected && | |
616 | !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT)) | |
617 | continue; | |
618 | ||
a3c6d686 JH |
619 | repoll = true; |
620 | ||
6c5ed5ae | 621 | connector->status = drm_helper_probe_detect(connector, NULL, false); |
8d754544 DV |
622 | if (old_status != connector->status) { |
623 | const char *old, *new; | |
624 | ||
b7703726 DV |
625 | /* |
626 | * The poll work sets force=false when calling detect so | |
627 | * that drivers can avoid to do disruptive tests (e.g. | |
628 | * when load detect cycles could cause flickering on | |
629 | * other, running displays). This bears the risk that we | |
630 | * flip-flop between unknown here in the poll work and | |
631 | * the real state when userspace forces a full detect | |
632 | * call after receiving a hotplug event due to this | |
633 | * change. | |
634 | * | |
635 | * Hence clamp an unknown detect status to the old | |
636 | * value. | |
637 | */ | |
638 | if (connector->status == connector_status_unknown) { | |
639 | connector->status = old_status; | |
640 | continue; | |
641 | } | |
642 | ||
8d754544 DV |
643 | old = drm_get_connector_status_name(old_status); |
644 | new = drm_get_connector_status_name(connector->status); | |
645 | ||
646 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] " | |
647 | "status updated from %s to %s\n", | |
648 | connector->base.id, | |
25933820 | 649 | connector->name, |
8d754544 DV |
650 | old, new); |
651 | ||
652 | changed = true; | |
653 | } | |
654 | } | |
b982dab1 | 655 | drm_connector_list_iter_end(&conn_iter); |
8d754544 DV |
656 | |
657 | mutex_unlock(&dev->mode_config.mutex); | |
658 | ||
162b6a57 | 659 | out: |
8d754544 DV |
660 | if (changed) |
661 | drm_kms_helper_hotplug_event(dev); | |
662 | ||
663 | if (repoll) | |
664 | schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD); | |
665 | } | |
666 | ||
25c058cc LW |
667 | /** |
668 | * drm_kms_helper_is_poll_worker - is %current task an output poll worker? | |
669 | * | |
670 | * Determine if %current task is an output poll worker. This can be used | |
671 | * to select distinct code paths for output polling versus other contexts. | |
672 | * | |
673 | * One use case is to avoid a deadlock between the output poll worker and | |
674 | * the autosuspend worker wherein the latter waits for polling to finish | |
675 | * upon calling drm_kms_helper_poll_disable(), while the former waits for | |
676 | * runtime suspend to finish upon calling pm_runtime_get_sync() in a | |
677 | * connector ->detect hook. | |
678 | */ | |
679 | bool drm_kms_helper_is_poll_worker(void) | |
680 | { | |
681 | struct work_struct *work = current_work(); | |
682 | ||
683 | return work && work->func == output_poll_execute; | |
684 | } | |
685 | EXPORT_SYMBOL(drm_kms_helper_is_poll_worker); | |
686 | ||
8d754544 DV |
687 | /** |
688 | * drm_kms_helper_poll_disable - disable output polling | |
689 | * @dev: drm_device | |
690 | * | |
691 | * This function disables the output polling work. | |
692 | * | |
693 | * Drivers can call this helper from their device suspend implementation. It is | |
c4d79c22 DA |
694 | * not an error to call this even when output polling isn't enabled or already |
695 | * disabled. Polling is re-enabled by calling drm_kms_helper_poll_enable(). | |
696 | * | |
697 | * Note that calls to enable and disable polling must be strictly ordered, which | |
698 | * is automatically the case when they're only call from suspend/resume | |
699 | * callbacks. | |
8d754544 DV |
700 | */ |
701 | void drm_kms_helper_poll_disable(struct drm_device *dev) | |
702 | { | |
703 | if (!dev->mode_config.poll_enabled) | |
704 | return; | |
705 | cancel_delayed_work_sync(&dev->mode_config.output_poll_work); | |
706 | } | |
707 | EXPORT_SYMBOL(drm_kms_helper_poll_disable); | |
708 | ||
8d754544 DV |
709 | /** |
710 | * drm_kms_helper_poll_init - initialize and enable output polling | |
711 | * @dev: drm_device | |
712 | * | |
713 | * This function intializes and then also enables output polling support for | |
714 | * @dev. Drivers which do not have reliable hotplug support in hardware can use | |
715 | * this helper infrastructure to regularly poll such connectors for changes in | |
716 | * their connection state. | |
717 | * | |
718 | * Drivers can control which connectors are polled by setting the | |
719 | * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On | |
720 | * connectors where probing live outputs can result in visual distortion drivers | |
721 | * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this. | |
722 | * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are | |
723 | * completely ignored by the polling logic. | |
724 | * | |
725 | * Note that a connector can be both polled and probed from the hotplug handler, | |
726 | * in case the hotplug interrupt is known to be unreliable. | |
727 | */ | |
728 | void drm_kms_helper_poll_init(struct drm_device *dev) | |
729 | { | |
730 | INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute); | |
731 | dev->mode_config.poll_enabled = true; | |
732 | ||
733 | drm_kms_helper_poll_enable(dev); | |
734 | } | |
735 | EXPORT_SYMBOL(drm_kms_helper_poll_init); | |
736 | ||
737 | /** | |
738 | * drm_kms_helper_poll_fini - disable output polling and clean it up | |
739 | * @dev: drm_device | |
740 | */ | |
741 | void drm_kms_helper_poll_fini(struct drm_device *dev) | |
742 | { | |
3b295cb1 CW |
743 | if (!dev->mode_config.poll_enabled) |
744 | return; | |
745 | ||
746 | dev->mode_config.poll_enabled = false; | |
747 | cancel_delayed_work_sync(&dev->mode_config.output_poll_work); | |
8d754544 DV |
748 | } |
749 | EXPORT_SYMBOL(drm_kms_helper_poll_fini); | |
750 | ||
751 | /** | |
752 | * drm_helper_hpd_irq_event - hotplug processing | |
753 | * @dev: drm_device | |
754 | * | |
755 | * Drivers can use this helper function to run a detect cycle on all connectors | |
756 | * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All | |
757 | * other connectors are ignored, which is useful to avoid reprobing fixed | |
758 | * panels. | |
759 | * | |
760 | * This helper function is useful for drivers which can't or don't track hotplug | |
761 | * interrupts for each connector. | |
762 | * | |
763 | * Drivers which support hotplug interrupts for each connector individually and | |
764 | * which have a more fine-grained detect logic should bypass this code and | |
765 | * directly call drm_kms_helper_hotplug_event() in case the connector state | |
766 | * changed. | |
767 | * | |
768 | * This function must be called from process context with no mode | |
769 | * setting locks held. | |
770 | * | |
771 | * Note that a connector can be both polled and probed from the hotplug handler, | |
772 | * in case the hotplug interrupt is known to be unreliable. | |
773 | */ | |
774 | bool drm_helper_hpd_irq_event(struct drm_device *dev) | |
775 | { | |
776 | struct drm_connector *connector; | |
c36a3254 | 777 | struct drm_connector_list_iter conn_iter; |
8d754544 DV |
778 | enum drm_connector_status old_status; |
779 | bool changed = false; | |
780 | ||
781 | if (!dev->mode_config.poll_enabled) | |
782 | return false; | |
783 | ||
784 | mutex_lock(&dev->mode_config.mutex); | |
b982dab1 | 785 | drm_connector_list_iter_begin(dev, &conn_iter); |
c36a3254 | 786 | drm_for_each_connector_iter(connector, &conn_iter) { |
8d754544 DV |
787 | /* Only handle HPD capable connectors. */ |
788 | if (!(connector->polled & DRM_CONNECTOR_POLL_HPD)) | |
789 | continue; | |
790 | ||
791 | old_status = connector->status; | |
792 | ||
6c5ed5ae | 793 | connector->status = drm_helper_probe_detect(connector, NULL, false); |
8d754544 DV |
794 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", |
795 | connector->base.id, | |
25933820 | 796 | connector->name, |
8d754544 DV |
797 | drm_get_connector_status_name(old_status), |
798 | drm_get_connector_status_name(connector->status)); | |
799 | if (old_status != connector->status) | |
800 | changed = true; | |
801 | } | |
b982dab1 | 802 | drm_connector_list_iter_end(&conn_iter); |
8d754544 DV |
803 | mutex_unlock(&dev->mode_config.mutex); |
804 | ||
805 | if (changed) | |
806 | drm_kms_helper_hotplug_event(dev); | |
807 | ||
808 | return changed; | |
809 | } | |
810 | EXPORT_SYMBOL(drm_helper_hpd_irq_event); |