Commit | Line | Data |
---|---|---|
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 | ||
1c26b8e0 | 89 | static int |
97f973d6 | 90 | drm_mode_validate_pipeline(struct drm_display_mode *mode, |
1c26b8e0 LP |
91 | struct drm_connector *connector, |
92 | struct drm_modeset_acquire_ctx *ctx, | |
93 | enum drm_mode_status *status) | |
97f973d6 JA |
94 | { |
95 | struct drm_device *dev = connector->dev; | |
83aefbb8 | 96 | struct drm_encoder *encoder; |
1c26b8e0 | 97 | int ret; |
97f973d6 JA |
98 | |
99 | /* Step 1: Validate against connector */ | |
1c26b8e0 LP |
100 | ret = drm_connector_mode_valid(connector, mode, ctx, status); |
101 | if (ret || *status != MODE_OK) | |
97f973d6 JA |
102 | return ret; |
103 | ||
104 | /* Step 2: Validate against encoders and crtcs */ | |
62afb4ad | 105 | drm_connector_for_each_possible_encoder(connector, encoder) { |
35a61fe9 | 106 | struct drm_bridge *bridge; |
97f973d6 JA |
107 | struct drm_crtc *crtc; |
108 | ||
1c26b8e0 LP |
109 | *status = drm_encoder_mode_valid(encoder, mode); |
110 | if (*status != MODE_OK) { | |
97f973d6 JA |
111 | /* No point in continuing for crtc check as this encoder |
112 | * will not accept the mode anyway. If all encoders | |
113 | * reject the mode then, at exit, ret will not be | |
114 | * MODE_OK. */ | |
115 | continue; | |
116 | } | |
117 | ||
35a61fe9 | 118 | bridge = drm_bridge_chain_get_first_bridge(encoder); |
418eda8f DA |
119 | *status = drm_bridge_chain_mode_valid(bridge, |
120 | &connector->display_info, | |
121 | mode); | |
1c26b8e0 | 122 | if (*status != MODE_OK) { |
97f973d6 JA |
123 | /* There is also no point in continuing for crtc check |
124 | * here. */ | |
125 | continue; | |
126 | } | |
127 | ||
128 | drm_for_each_crtc(crtc, dev) { | |
129 | if (!drm_encoder_crtc_ok(encoder, crtc)) | |
130 | continue; | |
131 | ||
1c26b8e0 LP |
132 | *status = drm_crtc_mode_valid(crtc, mode); |
133 | if (*status == MODE_OK) { | |
97f973d6 JA |
134 | /* If we get to this point there is at least |
135 | * one combination of encoder+crtc that works | |
136 | * for this mode. Lets return now. */ | |
1c26b8e0 | 137 | return 0; |
97f973d6 JA |
138 | } |
139 | } | |
140 | } | |
141 | ||
1c26b8e0 | 142 | return 0; |
97f973d6 JA |
143 | } |
144 | ||
eaf99c74 CW |
145 | static int drm_helper_probe_add_cmdline_mode(struct drm_connector *connector) |
146 | { | |
5f0c3f99 | 147 | struct drm_cmdline_mode *cmdline_mode; |
eaf99c74 CW |
148 | struct drm_display_mode *mode; |
149 | ||
5f0c3f99 CW |
150 | cmdline_mode = &connector->cmdline_mode; |
151 | if (!cmdline_mode->specified) | |
eaf99c74 CW |
152 | return 0; |
153 | ||
5f0c3f99 CW |
154 | /* Only add a GTF mode if we find no matching probed modes */ |
155 | list_for_each_entry(mode, &connector->probed_modes, head) { | |
156 | if (mode->hdisplay != cmdline_mode->xres || | |
157 | mode->vdisplay != cmdline_mode->yres) | |
158 | continue; | |
159 | ||
160 | if (cmdline_mode->refresh_specified) { | |
161 | /* The probed mode's vrefresh is set until later */ | |
162 | if (drm_mode_vrefresh(mode) != cmdline_mode->refresh) | |
163 | continue; | |
164 | } | |
165 | ||
ebdc02dd HG |
166 | /* Mark the matching mode as being preferred by the user */ |
167 | mode->type |= DRM_MODE_TYPE_USERDEF; | |
5f0c3f99 CW |
168 | return 0; |
169 | } | |
170 | ||
eaf99c74 | 171 | mode = drm_mode_create_from_cmdline_mode(connector->dev, |
5f0c3f99 | 172 | cmdline_mode); |
eaf99c74 CW |
173 | if (mode == NULL) |
174 | return 0; | |
175 | ||
176 | drm_mode_probed_add(connector, mode); | |
177 | return 1; | |
178 | } | |
179 | ||
da251bf8 JA |
180 | enum drm_mode_status drm_crtc_mode_valid(struct drm_crtc *crtc, |
181 | const struct drm_display_mode *mode) | |
182 | { | |
183 | const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; | |
184 | ||
185 | if (!crtc_funcs || !crtc_funcs->mode_valid) | |
186 | return MODE_OK; | |
187 | ||
188 | return crtc_funcs->mode_valid(crtc, mode); | |
189 | } | |
190 | ||
191 | enum drm_mode_status drm_encoder_mode_valid(struct drm_encoder *encoder, | |
192 | const struct drm_display_mode *mode) | |
193 | { | |
194 | const struct drm_encoder_helper_funcs *encoder_funcs = | |
195 | encoder->helper_private; | |
196 | ||
197 | if (!encoder_funcs || !encoder_funcs->mode_valid) | |
198 | return MODE_OK; | |
199 | ||
200 | return encoder_funcs->mode_valid(encoder, mode); | |
201 | } | |
202 | ||
1c26b8e0 LP |
203 | int |
204 | drm_connector_mode_valid(struct drm_connector *connector, | |
205 | struct drm_display_mode *mode, | |
206 | struct drm_modeset_acquire_ctx *ctx, | |
207 | enum drm_mode_status *status) | |
da251bf8 JA |
208 | { |
209 | const struct drm_connector_helper_funcs *connector_funcs = | |
210 | connector->helper_private; | |
1c26b8e0 LP |
211 | int ret = 0; |
212 | ||
213 | if (!connector_funcs) | |
214 | *status = MODE_OK; | |
215 | else if (connector_funcs->mode_valid_ctx) | |
216 | ret = connector_funcs->mode_valid_ctx(connector, mode, ctx, | |
217 | status); | |
218 | else if (connector_funcs->mode_valid) | |
219 | *status = connector_funcs->mode_valid(connector, mode); | |
220 | else | |
221 | *status = MODE_OK; | |
da251bf8 | 222 | |
1c26b8e0 | 223 | return ret; |
da251bf8 JA |
224 | } |
225 | ||
8c4ccc4a | 226 | #define DRM_OUTPUT_POLL_PERIOD (10*HZ) |
4ad640e9 | 227 | /** |
c4d79c22 | 228 | * drm_kms_helper_poll_enable - re-enable output polling. |
4ad640e9 EE |
229 | * @dev: drm_device |
230 | * | |
c4d79c22 DA |
231 | * This function re-enables the output polling work, after it has been |
232 | * temporarily disabled using drm_kms_helper_poll_disable(), for example over | |
233 | * suspend/resume. | |
4ad640e9 | 234 | * |
c4d79c22 | 235 | * Drivers can call this helper from their device resume implementation. It is |
b66d0f34 | 236 | * not an error to call this even when output polling isn't enabled. |
c4d79c22 DA |
237 | * |
238 | * Note that calls to enable and disable polling must be strictly ordered, which | |
239 | * is automatically the case when they're only call from suspend/resume | |
240 | * callbacks. | |
4ad640e9 | 241 | */ |
c4d79c22 | 242 | void drm_kms_helper_poll_enable(struct drm_device *dev) |
8c4ccc4a DV |
243 | { |
244 | bool poll = false; | |
245 | struct drm_connector *connector; | |
c36a3254 | 246 | struct drm_connector_list_iter conn_iter; |
339fd362 | 247 | unsigned long delay = DRM_OUTPUT_POLL_PERIOD; |
8c4ccc4a | 248 | |
8c4ccc4a DV |
249 | if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll) |
250 | return; | |
251 | ||
b982dab1 | 252 | drm_connector_list_iter_begin(dev, &conn_iter); |
c36a3254 | 253 | drm_for_each_connector_iter(connector, &conn_iter) { |
8c4ccc4a DV |
254 | if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | |
255 | DRM_CONNECTOR_POLL_DISCONNECT)) | |
256 | poll = true; | |
257 | } | |
b982dab1 | 258 | drm_connector_list_iter_end(&conn_iter); |
8c4ccc4a | 259 | |
339fd362 | 260 | if (dev->mode_config.delayed_event) { |
68f458ee PU |
261 | /* |
262 | * FIXME: | |
263 | * | |
264 | * Use short (1s) delay to handle the initial delayed event. | |
265 | * This delay should not be needed, but Optimus/nouveau will | |
266 | * fail in a mysterious way if the delayed event is handled as | |
267 | * soon as possible like it is done in | |
268 | * drm_helper_probe_single_connector_modes() in case the poll | |
269 | * was enabled before. | |
270 | */ | |
339fd362 | 271 | poll = true; |
68f458ee | 272 | delay = HZ; |
339fd362 PU |
273 | } |
274 | ||
8c4ccc4a | 275 | if (poll) |
339fd362 | 276 | schedule_delayed_work(&dev->mode_config.output_poll_work, delay); |
8c4ccc4a | 277 | } |
c4d79c22 | 278 | EXPORT_SYMBOL(drm_kms_helper_poll_enable); |
4ad640e9 | 279 | |
949f0886 | 280 | static enum drm_connector_status |
6c5ed5ae | 281 | drm_helper_probe_detect_ctx(struct drm_connector *connector, bool force) |
949f0886 | 282 | { |
6c5ed5ae ML |
283 | const struct drm_connector_helper_funcs *funcs = connector->helper_private; |
284 | struct drm_modeset_acquire_ctx ctx; | |
285 | int ret; | |
286 | ||
287 | drm_modeset_acquire_init(&ctx, 0); | |
288 | ||
289 | retry: | |
290 | ret = drm_modeset_lock(&connector->dev->mode_config.connection_mutex, &ctx); | |
291 | if (!ret) { | |
292 | if (funcs->detect_ctx) | |
293 | ret = funcs->detect_ctx(connector, &ctx, force); | |
294 | else if (connector->funcs->detect) | |
295 | ret = connector->funcs->detect(connector, force); | |
296 | else | |
297 | ret = connector_status_connected; | |
298 | } | |
299 | ||
300 | if (ret == -EDEADLK) { | |
301 | drm_modeset_backoff(&ctx); | |
302 | goto retry; | |
303 | } | |
304 | ||
305 | if (WARN_ON(ret < 0)) | |
306 | ret = connector_status_unknown; | |
307 | ||
5186421c SL |
308 | if (ret != connector->status) |
309 | connector->epoch_counter += 1; | |
310 | ||
6c5ed5ae ML |
311 | drm_modeset_drop_locks(&ctx); |
312 | drm_modeset_acquire_fini(&ctx); | |
313 | ||
314 | return ret; | |
315 | } | |
316 | ||
317 | /** | |
318 | * drm_helper_probe_detect - probe connector status | |
319 | * @connector: connector to probe | |
320 | * @ctx: acquire_ctx, or NULL to let this function handle locking. | |
321 | * @force: Whether destructive probe operations should be performed. | |
322 | * | |
323 | * This function calls the detect callbacks of the connector. | |
324 | * This function returns &drm_connector_status, or | |
325 | * if @ctx is set, it might also return -EDEADLK. | |
326 | */ | |
327 | int | |
328 | drm_helper_probe_detect(struct drm_connector *connector, | |
329 | struct drm_modeset_acquire_ctx *ctx, | |
330 | bool force) | |
331 | { | |
332 | const struct drm_connector_helper_funcs *funcs = connector->helper_private; | |
333 | struct drm_device *dev = connector->dev; | |
334 | int ret; | |
335 | ||
336 | if (!ctx) | |
337 | return drm_helper_probe_detect_ctx(connector, force); | |
338 | ||
339 | ret = drm_modeset_lock(&dev->mode_config.connection_mutex, ctx); | |
340 | if (ret) | |
341 | return ret; | |
342 | ||
343 | if (funcs->detect_ctx) | |
5186421c | 344 | ret = funcs->detect_ctx(connector, ctx, force); |
6c5ed5ae | 345 | else if (connector->funcs->detect) |
5186421c | 346 | ret = connector->funcs->detect(connector, force); |
6c5ed5ae | 347 | else |
5186421c SL |
348 | ret = connector_status_connected; |
349 | ||
350 | if (ret != connector->status) | |
351 | connector->epoch_counter += 1; | |
352 | ||
353 | return ret; | |
949f0886 | 354 | } |
6c5ed5ae | 355 | EXPORT_SYMBOL(drm_helper_probe_detect); |
949f0886 | 356 | |
6af3e656 VS |
357 | /** |
358 | * drm_helper_probe_single_connector_modes - get complete set of display modes | |
359 | * @connector: connector to probe | |
360 | * @maxX: max width for modes | |
361 | * @maxY: max height for modes | |
362 | * | |
363 | * Based on the helper callbacks implemented by @connector in struct | |
364 | * &drm_connector_helper_funcs try to detect all valid modes. Modes will first | |
365 | * be added to the connector's probed_modes list, then culled (based on validity | |
366 | * and the @maxX, @maxY parameters) and put into the normal modes list. | |
367 | * | |
6806cdf9 DV |
368 | * Intended to be used as a generic implementation of the |
369 | * &drm_connector_funcs.fill_modes() vfunc for drivers that use the CRTC helpers | |
370 | * for output mode filtering and detection. | |
6af3e656 | 371 | * |
5dec293b VS |
372 | * The basic procedure is as follows |
373 | * | |
374 | * 1. All modes currently on the connector's modes list are marked as stale | |
375 | * | |
376 | * 2. New modes are added to the connector's probed_modes list with | |
377 | * drm_mode_probed_add(). New modes start their life with status as OK. | |
378 | * Modes are added from a single source using the following priority order. | |
379 | * | |
6806cdf9 | 380 | * - &drm_connector_helper_funcs.get_modes vfunc |
5dec293b VS |
381 | * - if the connector status is connector_status_connected, standard |
382 | * VESA DMT modes up to 1024x768 are automatically added | |
383 | * (drm_add_modes_noedid()) | |
384 | * | |
385 | * Finally modes specified via the kernel command line (video=...) are | |
386 | * added in addition to what the earlier probes produced | |
387 | * (drm_helper_probe_add_cmdline_mode()). These modes are generated | |
388 | * using the VESA GTF/CVT formulas. | |
389 | * | |
390 | * 3. Modes are moved from the probed_modes list to the modes list. Potential | |
97e14fbe | 391 | * duplicates are merged together (see drm_connector_list_update()). |
5dec293b VS |
392 | * After this step the probed_modes list will be empty again. |
393 | * | |
394 | * 4. Any non-stale mode on the modes list then undergoes validation | |
395 | * | |
396 | * - drm_mode_validate_basic() performs basic sanity checks | |
397 | * - drm_mode_validate_size() filters out modes larger than @maxX and @maxY | |
398 | * (if specified) | |
57366a8d MY |
399 | * - drm_mode_validate_flag() checks the modes against basic connector |
400 | * capabilities (interlace_allowed,doublescan_allowed,stereo_allowed) | |
1c26b8e0 LP |
401 | * - the optional &drm_connector_helper_funcs.mode_valid or |
402 | * &drm_connector_helper_funcs.mode_valid_ctx helpers can perform driver | |
403 | * and/or sink specific checks | |
97f973d6 JA |
404 | * - the optional &drm_crtc_helper_funcs.mode_valid, |
405 | * &drm_bridge_funcs.mode_valid and &drm_encoder_helper_funcs.mode_valid | |
406 | * helpers can perform driver and/or source specific checks which are also | |
407 | * enforced by the modeset/atomic helpers | |
5dec293b VS |
408 | * |
409 | * 5. Any mode whose status is not OK is pruned from the connector's modes list, | |
410 | * accompanied by a debug message indicating the reason for the mode's | |
411 | * rejection (see drm_mode_prune_invalid()). | |
6af3e656 VS |
412 | * |
413 | * Returns: | |
414 | * The number of modes found on @connector. | |
415 | */ | |
416 | int drm_helper_probe_single_connector_modes(struct drm_connector *connector, | |
417 | uint32_t maxX, uint32_t maxY) | |
8d754544 DV |
418 | { |
419 | struct drm_device *dev = connector->dev; | |
420 | struct drm_display_mode *mode; | |
be26a66d | 421 | const struct drm_connector_helper_funcs *connector_funcs = |
8d754544 | 422 | connector->helper_private; |
6c5ed5ae | 423 | int count = 0, ret; |
8d754544 DV |
424 | int mode_flags = 0; |
425 | bool verbose_prune = true; | |
162b6a57 | 426 | enum drm_connector_status old_status; |
6c5ed5ae | 427 | struct drm_modeset_acquire_ctx ctx; |
8d754544 DV |
428 | |
429 | WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); | |
430 | ||
6c5ed5ae ML |
431 | drm_modeset_acquire_init(&ctx, 0); |
432 | ||
8d754544 | 433 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, |
25933820 | 434 | connector->name); |
6c5ed5ae ML |
435 | |
436 | retry: | |
437 | ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx); | |
438 | if (ret == -EDEADLK) { | |
439 | drm_modeset_backoff(&ctx); | |
440 | goto retry; | |
441 | } else | |
442 | WARN_ON(ret < 0); | |
443 | ||
5ba89406 | 444 | /* set all old modes to the stale state */ |
8d754544 | 445 | list_for_each_entry(mode, &connector->modes, head) |
5ba89406 | 446 | mode->status = MODE_STALE; |
8d754544 | 447 | |
ed293f77 DV |
448 | old_status = connector->status; |
449 | ||
8d754544 | 450 | if (connector->force) { |
2c4cc91b PH |
451 | if (connector->force == DRM_FORCE_ON || |
452 | connector->force == DRM_FORCE_ON_DIGITAL) | |
8d754544 DV |
453 | connector->status = connector_status_connected; |
454 | else | |
455 | connector->status = connector_status_disconnected; | |
456 | if (connector->funcs->force) | |
457 | connector->funcs->force(connector); | |
458 | } else { | |
6c5ed5ae ML |
459 | ret = drm_helper_probe_detect(connector, &ctx, true); |
460 | ||
461 | if (ret == -EDEADLK) { | |
462 | drm_modeset_backoff(&ctx); | |
463 | goto retry; | |
464 | } else if (WARN(ret < 0, "Invalid return value %i for connector detection\n", ret)) | |
465 | ret = connector_status_unknown; | |
466 | ||
467 | connector->status = ret; | |
ed293f77 DV |
468 | } |
469 | ||
470 | /* | |
471 | * Normally either the driver's hpd code or the poll loop should | |
472 | * pick up any changes and fire the hotplug event. But if | |
473 | * userspace sneaks in a probe, we might miss a change. Hence | |
474 | * check here, and if anything changed start the hotplug code. | |
475 | */ | |
476 | if (old_status != connector->status) { | |
4e15f2a1 | 477 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", |
ed293f77 DV |
478 | connector->base.id, |
479 | connector->name, | |
4e15f2a1 JN |
480 | drm_get_connector_status_name(old_status), |
481 | drm_get_connector_status_name(connector->status)); | |
162b6a57 DV |
482 | |
483 | /* | |
ed293f77 DV |
484 | * The hotplug event code might call into the fb |
485 | * helpers, and so expects that we do not hold any | |
486 | * locks. Fire up the poll struct instead, it will | |
487 | * disable itself again. | |
162b6a57 | 488 | */ |
ed293f77 DV |
489 | dev->mode_config.delayed_event = true; |
490 | if (dev->mode_config.poll_enabled) | |
491 | schedule_delayed_work(&dev->mode_config.output_poll_work, | |
492 | 0); | |
8d754544 DV |
493 | } |
494 | ||
495 | /* Re-enable polling in case the global poll config changed. */ | |
496 | if (drm_kms_helper_poll != dev->mode_config.poll_running) | |
c4d79c22 | 497 | drm_kms_helper_poll_enable(dev); |
8d754544 DV |
498 | |
499 | dev->mode_config.poll_running = drm_kms_helper_poll; | |
500 | ||
501 | if (connector->status == connector_status_disconnected) { | |
502 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n", | |
25933820 | 503 | connector->base.id, connector->name); |
c555f023 | 504 | drm_connector_update_edid_property(connector, NULL); |
8d754544 DV |
505 | verbose_prune = false; |
506 | goto prune; | |
507 | } | |
508 | ||
53fd40a9 | 509 | count = (*connector_funcs->get_modes)(connector); |
8d754544 | 510 | |
48eaeb76 JN |
511 | /* |
512 | * Fallback for when DDC probe failed in drm_get_edid() and thus skipped | |
513 | * override/firmware EDID. | |
514 | */ | |
515 | if (count == 0 && connector->status == connector_status_connected) | |
516 | count = drm_add_override_edid_modes(connector); | |
517 | ||
2551952e LP |
518 | if (count == 0 && (connector->status == connector_status_connected || |
519 | connector->status == connector_status_unknown)) | |
8d754544 | 520 | count = drm_add_modes_noedid(connector, 1024, 768); |
eaf99c74 | 521 | count += drm_helper_probe_add_cmdline_mode(connector); |
8d754544 DV |
522 | if (count == 0) |
523 | goto prune; | |
524 | ||
97e14fbe | 525 | drm_connector_list_update(connector); |
8d754544 | 526 | |
8d754544 DV |
527 | if (connector->interlace_allowed) |
528 | mode_flags |= DRM_MODE_FLAG_INTERLACE; | |
529 | if (connector->doublescan_allowed) | |
530 | mode_flags |= DRM_MODE_FLAG_DBLSCAN; | |
531 | if (connector->stereo_allowed) | |
532 | mode_flags |= DRM_MODE_FLAG_3D_MASK; | |
8d754544 DV |
533 | |
534 | list_for_each_entry(mode, &connector->modes, head) { | |
1c26b8e0 LP |
535 | if (mode->status != MODE_OK) |
536 | continue; | |
537 | ||
538 | mode->status = drm_mode_validate_driver(dev, mode); | |
539 | if (mode->status != MODE_OK) | |
540 | continue; | |
abc0b144 | 541 | |
1c26b8e0 LP |
542 | mode->status = drm_mode_validate_size(mode, maxX, maxY); |
543 | if (mode->status != MODE_OK) | |
544 | continue; | |
05acaec3 | 545 | |
1c26b8e0 LP |
546 | mode->status = drm_mode_validate_flag(mode, mode_flags); |
547 | if (mode->status != MODE_OK) | |
548 | continue; | |
05acaec3 | 549 | |
1c26b8e0 LP |
550 | ret = drm_mode_validate_pipeline(mode, connector, &ctx, |
551 | &mode->status); | |
552 | if (ret) { | |
553 | drm_dbg_kms(dev, | |
554 | "drm_mode_validate_pipeline failed: %d\n", | |
555 | ret); | |
556 | ||
557 | if (drm_WARN_ON_ONCE(dev, ret != -EDEADLK)) { | |
558 | mode->status = MODE_ERROR; | |
559 | } else { | |
560 | drm_modeset_backoff(&ctx); | |
561 | goto retry; | |
562 | } | |
563 | } | |
d8523153 | 564 | |
1c26b8e0 LP |
565 | if (mode->status != MODE_OK) |
566 | continue; | |
567 | mode->status = drm_mode_validate_ycbcr420(mode, connector); | |
8d754544 DV |
568 | } |
569 | ||
570 | prune: | |
571 | drm_mode_prune_invalid(dev, &connector->modes, verbose_prune); | |
572 | ||
6c5ed5ae ML |
573 | drm_modeset_drop_locks(&ctx); |
574 | drm_modeset_acquire_fini(&ctx); | |
575 | ||
8d754544 DV |
576 | if (list_empty(&connector->modes)) |
577 | return 0; | |
578 | ||
8d754544 DV |
579 | drm_mode_sort(&connector->modes); |
580 | ||
581 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id, | |
25933820 | 582 | connector->name); |
8d754544 DV |
583 | list_for_each_entry(mode, &connector->modes, head) { |
584 | drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V); | |
585 | drm_mode_debug_printmodeline(mode); | |
586 | } | |
587 | ||
588 | return count; | |
589 | } | |
590 | EXPORT_SYMBOL(drm_helper_probe_single_connector_modes); | |
591 | ||
592 | /** | |
593 | * drm_kms_helper_hotplug_event - fire off KMS hotplug events | |
594 | * @dev: drm_device whose connector state changed | |
595 | * | |
596 | * This function fires off the uevent for userspace and also calls the | |
597 | * output_poll_changed function, which is most commonly used to inform the fbdev | |
598 | * emulation code and allow it to update the fbcon output configuration. | |
599 | * | |
600 | * Drivers should call this from their hotplug handling code when a change is | |
601 | * detected. Note that this function does not do any output detection of its | |
602 | * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the | |
603 | * driver already. | |
604 | * | |
605 | * This function must be called from process context with no mode | |
606 | * setting locks held. | |
710074bb SS |
607 | * |
608 | * If only a single connector has changed, consider calling | |
609 | * drm_kms_helper_connector_hotplug_event() instead. | |
8d754544 DV |
610 | */ |
611 | void drm_kms_helper_hotplug_event(struct drm_device *dev) | |
612 | { | |
613 | /* send a uevent + call fbdev */ | |
614 | drm_sysfs_hotplug_event(dev); | |
615 | if (dev->mode_config.funcs->output_poll_changed) | |
616 | dev->mode_config.funcs->output_poll_changed(dev); | |
c76f0f7c NT |
617 | |
618 | drm_client_dev_hotplug(dev); | |
8d754544 DV |
619 | } |
620 | EXPORT_SYMBOL(drm_kms_helper_hotplug_event); | |
621 | ||
710074bb SS |
622 | /** |
623 | * drm_kms_helper_connector_hotplug_event - fire off a KMS connector hotplug event | |
624 | * @connector: drm_connector which has changed | |
625 | * | |
626 | * This is the same as drm_kms_helper_hotplug_event(), except it fires a more | |
627 | * fine-grained uevent for a single connector. | |
628 | */ | |
629 | void drm_kms_helper_connector_hotplug_event(struct drm_connector *connector) | |
630 | { | |
631 | struct drm_device *dev = connector->dev; | |
632 | ||
633 | /* send a uevent + call fbdev */ | |
634 | drm_sysfs_connector_hotplug_event(connector); | |
635 | if (dev->mode_config.funcs->output_poll_changed) | |
636 | dev->mode_config.funcs->output_poll_changed(dev); | |
637 | ||
638 | drm_client_dev_hotplug(dev); | |
639 | } | |
640 | EXPORT_SYMBOL(drm_kms_helper_connector_hotplug_event); | |
641 | ||
8d754544 DV |
642 | static void output_poll_execute(struct work_struct *work) |
643 | { | |
644 | struct delayed_work *delayed_work = to_delayed_work(work); | |
645 | struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work); | |
646 | struct drm_connector *connector; | |
c36a3254 | 647 | struct drm_connector_list_iter conn_iter; |
8d754544 | 648 | enum drm_connector_status old_status; |
162b6a57 | 649 | bool repoll = false, changed; |
dc659a4e | 650 | u64 old_epoch_counter; |
162b6a57 | 651 | |
3b295cb1 CW |
652 | if (!dev->mode_config.poll_enabled) |
653 | return; | |
654 | ||
162b6a57 DV |
655 | /* Pick up any changes detected by the probe functions. */ |
656 | changed = dev->mode_config.delayed_event; | |
657 | dev->mode_config.delayed_event = false; | |
8d754544 DV |
658 | |
659 | if (!drm_kms_helper_poll) | |
162b6a57 | 660 | goto out; |
8d754544 | 661 | |
1fe7841d CW |
662 | if (!mutex_trylock(&dev->mode_config.mutex)) { |
663 | repoll = true; | |
664 | goto out; | |
665 | } | |
666 | ||
b982dab1 | 667 | drm_connector_list_iter_begin(dev, &conn_iter); |
c36a3254 | 668 | drm_for_each_connector_iter(connector, &conn_iter) { |
8d754544 DV |
669 | /* Ignore forced connectors. */ |
670 | if (connector->force) | |
671 | continue; | |
672 | ||
673 | /* Ignore HPD capable connectors and connectors where we don't | |
674 | * want any hotplug detection at all for polling. */ | |
675 | if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD) | |
676 | continue; | |
677 | ||
8d754544 DV |
678 | old_status = connector->status; |
679 | /* if we are connected and don't want to poll for disconnect | |
680 | skip it */ | |
681 | if (old_status == connector_status_connected && | |
682 | !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT)) | |
683 | continue; | |
684 | ||
a3c6d686 JH |
685 | repoll = true; |
686 | ||
dc659a4e | 687 | old_epoch_counter = connector->epoch_counter; |
6c5ed5ae | 688 | connector->status = drm_helper_probe_detect(connector, NULL, false); |
dc659a4e | 689 | if (old_epoch_counter != connector->epoch_counter) { |
8d754544 DV |
690 | const char *old, *new; |
691 | ||
b7703726 DV |
692 | /* |
693 | * The poll work sets force=false when calling detect so | |
694 | * that drivers can avoid to do disruptive tests (e.g. | |
695 | * when load detect cycles could cause flickering on | |
696 | * other, running displays). This bears the risk that we | |
697 | * flip-flop between unknown here in the poll work and | |
698 | * the real state when userspace forces a full detect | |
699 | * call after receiving a hotplug event due to this | |
700 | * change. | |
701 | * | |
702 | * Hence clamp an unknown detect status to the old | |
703 | * value. | |
704 | */ | |
705 | if (connector->status == connector_status_unknown) { | |
706 | connector->status = old_status; | |
707 | continue; | |
708 | } | |
709 | ||
8d754544 DV |
710 | old = drm_get_connector_status_name(old_status); |
711 | new = drm_get_connector_status_name(connector->status); | |
712 | ||
713 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] " | |
714 | "status updated from %s to %s\n", | |
715 | connector->base.id, | |
25933820 | 716 | connector->name, |
8d754544 | 717 | old, new); |
dc659a4e NT |
718 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] epoch counter %llu -> %llu\n", |
719 | connector->base.id, connector->name, | |
720 | old_epoch_counter, connector->epoch_counter); | |
8d754544 DV |
721 | |
722 | changed = true; | |
723 | } | |
724 | } | |
b982dab1 | 725 | drm_connector_list_iter_end(&conn_iter); |
8d754544 DV |
726 | |
727 | mutex_unlock(&dev->mode_config.mutex); | |
728 | ||
162b6a57 | 729 | out: |
8d754544 DV |
730 | if (changed) |
731 | drm_kms_helper_hotplug_event(dev); | |
732 | ||
733 | if (repoll) | |
734 | schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD); | |
735 | } | |
736 | ||
25c058cc LW |
737 | /** |
738 | * drm_kms_helper_is_poll_worker - is %current task an output poll worker? | |
739 | * | |
740 | * Determine if %current task is an output poll worker. This can be used | |
741 | * to select distinct code paths for output polling versus other contexts. | |
742 | * | |
743 | * One use case is to avoid a deadlock between the output poll worker and | |
744 | * the autosuspend worker wherein the latter waits for polling to finish | |
745 | * upon calling drm_kms_helper_poll_disable(), while the former waits for | |
746 | * runtime suspend to finish upon calling pm_runtime_get_sync() in a | |
747 | * connector ->detect hook. | |
748 | */ | |
749 | bool drm_kms_helper_is_poll_worker(void) | |
750 | { | |
751 | struct work_struct *work = current_work(); | |
752 | ||
753 | return work && work->func == output_poll_execute; | |
754 | } | |
755 | EXPORT_SYMBOL(drm_kms_helper_is_poll_worker); | |
756 | ||
8d754544 DV |
757 | /** |
758 | * drm_kms_helper_poll_disable - disable output polling | |
759 | * @dev: drm_device | |
760 | * | |
761 | * This function disables the output polling work. | |
762 | * | |
763 | * Drivers can call this helper from their device suspend implementation. It is | |
c4d79c22 DA |
764 | * not an error to call this even when output polling isn't enabled or already |
765 | * disabled. Polling is re-enabled by calling drm_kms_helper_poll_enable(). | |
766 | * | |
767 | * Note that calls to enable and disable polling must be strictly ordered, which | |
768 | * is automatically the case when they're only call from suspend/resume | |
769 | * callbacks. | |
8d754544 DV |
770 | */ |
771 | void drm_kms_helper_poll_disable(struct drm_device *dev) | |
772 | { | |
773 | if (!dev->mode_config.poll_enabled) | |
774 | return; | |
775 | cancel_delayed_work_sync(&dev->mode_config.output_poll_work); | |
776 | } | |
777 | EXPORT_SYMBOL(drm_kms_helper_poll_disable); | |
778 | ||
8d754544 DV |
779 | /** |
780 | * drm_kms_helper_poll_init - initialize and enable output polling | |
781 | * @dev: drm_device | |
782 | * | |
0ae865ef | 783 | * This function initializes and then also enables output polling support for |
8d754544 DV |
784 | * @dev. Drivers which do not have reliable hotplug support in hardware can use |
785 | * this helper infrastructure to regularly poll such connectors for changes in | |
786 | * their connection state. | |
787 | * | |
788 | * Drivers can control which connectors are polled by setting the | |
789 | * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On | |
790 | * connectors where probing live outputs can result in visual distortion drivers | |
791 | * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this. | |
792 | * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are | |
793 | * completely ignored by the polling logic. | |
794 | * | |
795 | * Note that a connector can be both polled and probed from the hotplug handler, | |
796 | * in case the hotplug interrupt is known to be unreliable. | |
797 | */ | |
798 | void drm_kms_helper_poll_init(struct drm_device *dev) | |
799 | { | |
800 | INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute); | |
801 | dev->mode_config.poll_enabled = true; | |
802 | ||
803 | drm_kms_helper_poll_enable(dev); | |
804 | } | |
805 | EXPORT_SYMBOL(drm_kms_helper_poll_init); | |
806 | ||
807 | /** | |
808 | * drm_kms_helper_poll_fini - disable output polling and clean it up | |
809 | * @dev: drm_device | |
810 | */ | |
811 | void drm_kms_helper_poll_fini(struct drm_device *dev) | |
812 | { | |
3b295cb1 CW |
813 | if (!dev->mode_config.poll_enabled) |
814 | return; | |
815 | ||
816 | dev->mode_config.poll_enabled = false; | |
817 | cancel_delayed_work_sync(&dev->mode_config.output_poll_work); | |
8d754544 DV |
818 | } |
819 | EXPORT_SYMBOL(drm_kms_helper_poll_fini); | |
820 | ||
0464ed1a MR |
821 | static bool check_connector_changed(struct drm_connector *connector) |
822 | { | |
823 | struct drm_device *dev = connector->dev; | |
824 | enum drm_connector_status old_status; | |
825 | u64 old_epoch_counter; | |
826 | ||
827 | /* Only handle HPD capable connectors. */ | |
828 | drm_WARN_ON(dev, !(connector->polled & DRM_CONNECTOR_POLL_HPD)); | |
829 | ||
830 | drm_WARN_ON(dev, !mutex_is_locked(&dev->mode_config.mutex)); | |
831 | ||
832 | old_status = connector->status; | |
833 | old_epoch_counter = connector->epoch_counter; | |
834 | connector->status = drm_helper_probe_detect(connector, NULL, false); | |
835 | ||
836 | if (old_epoch_counter == connector->epoch_counter) { | |
837 | drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Same epoch counter %llu\n", | |
838 | connector->base.id, | |
839 | connector->name, | |
840 | connector->epoch_counter); | |
841 | ||
842 | return false; | |
843 | } | |
844 | ||
845 | drm_dbg_kms(dev, "[CONNECTOR:%d:%s] status updated from %s to %s\n", | |
846 | connector->base.id, | |
847 | connector->name, | |
848 | drm_get_connector_status_name(old_status), | |
849 | drm_get_connector_status_name(connector->status)); | |
850 | ||
851 | drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Changed epoch counter %llu => %llu\n", | |
852 | connector->base.id, | |
853 | connector->name, | |
854 | old_epoch_counter, | |
855 | connector->epoch_counter); | |
856 | ||
857 | return true; | |
858 | } | |
859 | ||
860 | /** | |
861 | * drm_connector_helper_hpd_irq_event - hotplug processing | |
862 | * @connector: drm_connector | |
863 | * | |
864 | * Drivers can use this helper function to run a detect cycle on a connector | |
865 | * which has the DRM_CONNECTOR_POLL_HPD flag set in its &polled member. | |
866 | * | |
867 | * This helper function is useful for drivers which can track hotplug | |
868 | * interrupts for a single connector. Drivers that want to send a | |
869 | * hotplug event for all connectors or can't track hotplug interrupts | |
870 | * per connector need to use drm_helper_hpd_irq_event(). | |
871 | * | |
872 | * This function must be called from process context with no mode | |
873 | * setting locks held. | |
874 | * | |
875 | * Note that a connector can be both polled and probed from the hotplug | |
876 | * handler, in case the hotplug interrupt is known to be unreliable. | |
877 | * | |
878 | * Returns: | |
879 | * A boolean indicating whether the connector status changed or not | |
880 | */ | |
881 | bool drm_connector_helper_hpd_irq_event(struct drm_connector *connector) | |
882 | { | |
883 | struct drm_device *dev = connector->dev; | |
884 | bool changed; | |
885 | ||
886 | mutex_lock(&dev->mode_config.mutex); | |
887 | changed = check_connector_changed(connector); | |
888 | mutex_unlock(&dev->mode_config.mutex); | |
889 | ||
890 | if (changed) { | |
d35d4dbc | 891 | drm_kms_helper_connector_hotplug_event(connector); |
0464ed1a MR |
892 | drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Sent hotplug event\n", |
893 | connector->base.id, | |
894 | connector->name); | |
895 | } | |
896 | ||
897 | return changed; | |
898 | } | |
899 | EXPORT_SYMBOL(drm_connector_helper_hpd_irq_event); | |
900 | ||
8d754544 DV |
901 | /** |
902 | * drm_helper_hpd_irq_event - hotplug processing | |
903 | * @dev: drm_device | |
904 | * | |
905 | * Drivers can use this helper function to run a detect cycle on all connectors | |
906 | * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All | |
907 | * other connectors are ignored, which is useful to avoid reprobing fixed | |
908 | * panels. | |
909 | * | |
910 | * This helper function is useful for drivers which can't or don't track hotplug | |
911 | * interrupts for each connector. | |
912 | * | |
913 | * Drivers which support hotplug interrupts for each connector individually and | |
0464ed1a MR |
914 | * which have a more fine-grained detect logic can use |
915 | * drm_connector_helper_hpd_irq_event(). Alternatively, they should bypass this | |
916 | * code and directly call drm_kms_helper_hotplug_event() in case the connector | |
917 | * state changed. | |
8d754544 DV |
918 | * |
919 | * This function must be called from process context with no mode | |
920 | * setting locks held. | |
921 | * | |
922 | * Note that a connector can be both polled and probed from the hotplug handler, | |
923 | * in case the hotplug interrupt is known to be unreliable. | |
7dad41aa MR |
924 | * |
925 | * Returns: | |
926 | * A boolean indicating whether the connector status changed or not | |
8d754544 DV |
927 | */ |
928 | bool drm_helper_hpd_irq_event(struct drm_device *dev) | |
929 | { | |
d35d4dbc | 930 | struct drm_connector *connector, *first_changed_connector = NULL; |
c36a3254 | 931 | struct drm_connector_list_iter conn_iter; |
d35d4dbc | 932 | int changed = 0; |
8d754544 DV |
933 | |
934 | if (!dev->mode_config.poll_enabled) | |
935 | return false; | |
936 | ||
937 | mutex_lock(&dev->mode_config.mutex); | |
b982dab1 | 938 | drm_connector_list_iter_begin(dev, &conn_iter); |
c36a3254 | 939 | drm_for_each_connector_iter(connector, &conn_iter) { |
8d754544 DV |
940 | /* Only handle HPD capable connectors. */ |
941 | if (!(connector->polled & DRM_CONNECTOR_POLL_HPD)) | |
942 | continue; | |
943 | ||
d35d4dbc SS |
944 | if (check_connector_changed(connector)) { |
945 | if (!first_changed_connector) { | |
946 | drm_connector_get(connector); | |
947 | first_changed_connector = connector; | |
948 | } | |
949 | ||
950 | changed++; | |
951 | } | |
8d754544 | 952 | } |
b982dab1 | 953 | drm_connector_list_iter_end(&conn_iter); |
8d754544 DV |
954 | mutex_unlock(&dev->mode_config.mutex); |
955 | ||
d35d4dbc SS |
956 | if (changed == 1) |
957 | drm_kms_helper_connector_hotplug_event(first_changed_connector); | |
958 | else if (changed > 0) | |
8d754544 | 959 | drm_kms_helper_hotplug_event(dev); |
d35d4dbc SS |
960 | |
961 | if (first_changed_connector) | |
962 | drm_connector_put(first_changed_connector); | |
8d754544 DV |
963 | |
964 | return changed; | |
965 | } | |
966 | EXPORT_SYMBOL(drm_helper_hpd_irq_event); |