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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> | |
36 | #include <drm/drm_crtc.h> | |
37 | #include <drm/drm_fourcc.h> | |
38 | #include <drm/drm_crtc_helper.h> | |
39 | #include <drm/drm_fb_helper.h> | |
40 | #include <drm/drm_edid.h> | |
41 | ||
42 | /** | |
43 | * DOC: output probing helper overview | |
44 | * | |
45 | * This library provides some helper code for output probing. It provides an | |
46 | * implementation of the core connector->fill_modes interface with | |
47 | * drm_helper_probe_single_connector_modes. | |
48 | * | |
49 | * It also provides support for polling connectors with a work item and for | |
50 | * generic hotplug interrupt handling where the driver doesn't or cannot keep | |
51 | * track of a per-connector hpd interrupt. | |
52 | * | |
53 | * This helper library can be used independently of the modeset helper library. | |
54 | * Drivers can also overwrite different parts e.g. use their own hotplug | |
55 | * handling code to avoid probing unrelated outputs. | |
56 | */ | |
57 | ||
58 | static bool drm_kms_helper_poll = true; | |
59 | module_param_named(poll, drm_kms_helper_poll, bool, 0600); | |
60 | ||
61 | static void drm_mode_validate_flag(struct drm_connector *connector, | |
62 | int flags) | |
63 | { | |
64 | struct drm_display_mode *mode; | |
65 | ||
66 | if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE | | |
67 | DRM_MODE_FLAG_3D_MASK)) | |
68 | return; | |
69 | ||
70 | list_for_each_entry(mode, &connector->modes, head) { | |
71 | if ((mode->flags & DRM_MODE_FLAG_INTERLACE) && | |
72 | !(flags & DRM_MODE_FLAG_INTERLACE)) | |
73 | mode->status = MODE_NO_INTERLACE; | |
74 | if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) && | |
75 | !(flags & DRM_MODE_FLAG_DBLSCAN)) | |
76 | mode->status = MODE_NO_DBLESCAN; | |
77 | if ((mode->flags & DRM_MODE_FLAG_3D_MASK) && | |
78 | !(flags & DRM_MODE_FLAG_3D_MASK)) | |
79 | mode->status = MODE_NO_STEREO; | |
80 | } | |
81 | ||
82 | return; | |
83 | } | |
84 | ||
eaf99c74 CW |
85 | static int drm_helper_probe_add_cmdline_mode(struct drm_connector *connector) |
86 | { | |
87 | struct drm_display_mode *mode; | |
88 | ||
89 | if (!connector->cmdline_mode.specified) | |
90 | return 0; | |
91 | ||
92 | mode = drm_mode_create_from_cmdline_mode(connector->dev, | |
93 | &connector->cmdline_mode); | |
94 | if (mode == NULL) | |
95 | return 0; | |
96 | ||
97 | drm_mode_probed_add(connector, mode); | |
98 | return 1; | |
99 | } | |
100 | ||
b87577b7 DA |
101 | static int drm_helper_probe_single_connector_modes_merge_bits(struct drm_connector *connector, |
102 | uint32_t maxX, uint32_t maxY, bool merge_type_bits) | |
8d754544 DV |
103 | { |
104 | struct drm_device *dev = connector->dev; | |
105 | struct drm_display_mode *mode; | |
106 | struct drm_connector_helper_funcs *connector_funcs = | |
107 | connector->helper_private; | |
108 | int count = 0; | |
109 | int mode_flags = 0; | |
110 | bool verbose_prune = true; | |
111 | ||
112 | WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); | |
113 | ||
114 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, | |
25933820 | 115 | connector->name); |
8d754544 DV |
116 | /* set all modes to the unverified state */ |
117 | list_for_each_entry(mode, &connector->modes, head) | |
118 | mode->status = MODE_UNVERIFIED; | |
119 | ||
120 | if (connector->force) { | |
121 | if (connector->force == DRM_FORCE_ON) | |
122 | connector->status = connector_status_connected; | |
123 | else | |
124 | connector->status = connector_status_disconnected; | |
125 | if (connector->funcs->force) | |
126 | connector->funcs->force(connector); | |
127 | } else { | |
128 | connector->status = connector->funcs->detect(connector, true); | |
129 | } | |
130 | ||
131 | /* Re-enable polling in case the global poll config changed. */ | |
132 | if (drm_kms_helper_poll != dev->mode_config.poll_running) | |
133 | drm_kms_helper_poll_enable(dev); | |
134 | ||
135 | dev->mode_config.poll_running = drm_kms_helper_poll; | |
136 | ||
137 | if (connector->status == connector_status_disconnected) { | |
138 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n", | |
25933820 | 139 | connector->base.id, connector->name); |
8d754544 DV |
140 | drm_mode_connector_update_edid_property(connector, NULL); |
141 | verbose_prune = false; | |
142 | goto prune; | |
143 | } | |
144 | ||
145 | #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE | |
146 | count = drm_load_edid_firmware(connector); | |
147 | if (count == 0) | |
148 | #endif | |
4cf2b281 TW |
149 | { |
150 | if (connector->override_edid) { | |
151 | struct edid *edid = (struct edid *) connector->edid_blob_ptr->data; | |
152 | ||
153 | count = drm_add_edid_modes(connector, edid); | |
154 | } else | |
155 | count = (*connector_funcs->get_modes)(connector); | |
156 | } | |
8d754544 DV |
157 | |
158 | if (count == 0 && connector->status == connector_status_connected) | |
159 | count = drm_add_modes_noedid(connector, 1024, 768); | |
eaf99c74 | 160 | count += drm_helper_probe_add_cmdline_mode(connector); |
8d754544 DV |
161 | if (count == 0) |
162 | goto prune; | |
163 | ||
b87577b7 | 164 | drm_mode_connector_list_update(connector, merge_type_bits); |
8d754544 DV |
165 | |
166 | if (maxX && maxY) | |
167 | drm_mode_validate_size(dev, &connector->modes, maxX, maxY); | |
168 | ||
169 | if (connector->interlace_allowed) | |
170 | mode_flags |= DRM_MODE_FLAG_INTERLACE; | |
171 | if (connector->doublescan_allowed) | |
172 | mode_flags |= DRM_MODE_FLAG_DBLSCAN; | |
173 | if (connector->stereo_allowed) | |
174 | mode_flags |= DRM_MODE_FLAG_3D_MASK; | |
175 | drm_mode_validate_flag(connector, mode_flags); | |
176 | ||
177 | list_for_each_entry(mode, &connector->modes, head) { | |
f9b0e251 | 178 | if (mode->status == MODE_OK && connector_funcs->mode_valid) |
8d754544 DV |
179 | mode->status = connector_funcs->mode_valid(connector, |
180 | mode); | |
181 | } | |
182 | ||
183 | prune: | |
184 | drm_mode_prune_invalid(dev, &connector->modes, verbose_prune); | |
185 | ||
186 | if (list_empty(&connector->modes)) | |
187 | return 0; | |
188 | ||
189 | list_for_each_entry(mode, &connector->modes, head) | |
190 | mode->vrefresh = drm_mode_vrefresh(mode); | |
191 | ||
192 | drm_mode_sort(&connector->modes); | |
193 | ||
194 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id, | |
25933820 | 195 | connector->name); |
8d754544 DV |
196 | list_for_each_entry(mode, &connector->modes, head) { |
197 | drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V); | |
198 | drm_mode_debug_printmodeline(mode); | |
199 | } | |
200 | ||
201 | return count; | |
202 | } | |
b87577b7 DA |
203 | |
204 | /** | |
205 | * drm_helper_probe_single_connector_modes - get complete set of display modes | |
206 | * @connector: connector to probe | |
207 | * @maxX: max width for modes | |
208 | * @maxY: max height for modes | |
209 | * | |
210 | * Based on the helper callbacks implemented by @connector try to detect all | |
211 | * valid modes. Modes will first be added to the connector's probed_modes list, | |
212 | * then culled (based on validity and the @maxX, @maxY parameters) and put into | |
213 | * the normal modes list. | |
214 | * | |
215 | * Intended to be use as a generic implementation of the ->fill_modes() | |
216 | * @connector vfunc for drivers that use the crtc helpers for output mode | |
217 | * filtering and detection. | |
218 | * | |
219 | * Returns: | |
220 | * The number of modes found on @connector. | |
221 | */ | |
222 | int drm_helper_probe_single_connector_modes(struct drm_connector *connector, | |
223 | uint32_t maxX, uint32_t maxY) | |
224 | { | |
225 | return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, true); | |
226 | } | |
8d754544 DV |
227 | EXPORT_SYMBOL(drm_helper_probe_single_connector_modes); |
228 | ||
b87577b7 DA |
229 | /** |
230 | * drm_helper_probe_single_connector_modes_nomerge - get complete set of display modes | |
231 | * @connector: connector to probe | |
232 | * @maxX: max width for modes | |
233 | * @maxY: max height for modes | |
234 | * | |
235 | * This operates like drm_hehlper_probe_single_connector_modes except it | |
236 | * replaces the mode bits instead of merging them for preferred modes. | |
237 | */ | |
238 | int drm_helper_probe_single_connector_modes_nomerge(struct drm_connector *connector, | |
239 | uint32_t maxX, uint32_t maxY) | |
240 | { | |
241 | return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, false); | |
242 | } | |
243 | EXPORT_SYMBOL(drm_helper_probe_single_connector_modes_nomerge); | |
244 | ||
8d754544 DV |
245 | /** |
246 | * drm_kms_helper_hotplug_event - fire off KMS hotplug events | |
247 | * @dev: drm_device whose connector state changed | |
248 | * | |
249 | * This function fires off the uevent for userspace and also calls the | |
250 | * output_poll_changed function, which is most commonly used to inform the fbdev | |
251 | * emulation code and allow it to update the fbcon output configuration. | |
252 | * | |
253 | * Drivers should call this from their hotplug handling code when a change is | |
254 | * detected. Note that this function does not do any output detection of its | |
255 | * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the | |
256 | * driver already. | |
257 | * | |
258 | * This function must be called from process context with no mode | |
259 | * setting locks held. | |
260 | */ | |
261 | void drm_kms_helper_hotplug_event(struct drm_device *dev) | |
262 | { | |
263 | /* send a uevent + call fbdev */ | |
264 | drm_sysfs_hotplug_event(dev); | |
265 | if (dev->mode_config.funcs->output_poll_changed) | |
266 | dev->mode_config.funcs->output_poll_changed(dev); | |
267 | } | |
268 | EXPORT_SYMBOL(drm_kms_helper_hotplug_event); | |
269 | ||
270 | #define DRM_OUTPUT_POLL_PERIOD (10*HZ) | |
271 | static void output_poll_execute(struct work_struct *work) | |
272 | { | |
273 | struct delayed_work *delayed_work = to_delayed_work(work); | |
274 | struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work); | |
275 | struct drm_connector *connector; | |
276 | enum drm_connector_status old_status; | |
277 | bool repoll = false, changed = false; | |
278 | ||
279 | if (!drm_kms_helper_poll) | |
280 | return; | |
281 | ||
282 | mutex_lock(&dev->mode_config.mutex); | |
283 | list_for_each_entry(connector, &dev->mode_config.connector_list, head) { | |
284 | ||
285 | /* Ignore forced connectors. */ | |
286 | if (connector->force) | |
287 | continue; | |
288 | ||
289 | /* Ignore HPD capable connectors and connectors where we don't | |
290 | * want any hotplug detection at all for polling. */ | |
291 | if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD) | |
292 | continue; | |
293 | ||
294 | repoll = true; | |
295 | ||
296 | old_status = connector->status; | |
297 | /* if we are connected and don't want to poll for disconnect | |
298 | skip it */ | |
299 | if (old_status == connector_status_connected && | |
300 | !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT)) | |
301 | continue; | |
302 | ||
303 | connector->status = connector->funcs->detect(connector, false); | |
304 | if (old_status != connector->status) { | |
305 | const char *old, *new; | |
306 | ||
307 | old = drm_get_connector_status_name(old_status); | |
308 | new = drm_get_connector_status_name(connector->status); | |
309 | ||
310 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] " | |
311 | "status updated from %s to %s\n", | |
312 | connector->base.id, | |
25933820 | 313 | connector->name, |
8d754544 DV |
314 | old, new); |
315 | ||
316 | changed = true; | |
317 | } | |
318 | } | |
319 | ||
320 | mutex_unlock(&dev->mode_config.mutex); | |
321 | ||
322 | if (changed) | |
323 | drm_kms_helper_hotplug_event(dev); | |
324 | ||
325 | if (repoll) | |
326 | schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD); | |
327 | } | |
328 | ||
329 | /** | |
330 | * drm_kms_helper_poll_disable - disable output polling | |
331 | * @dev: drm_device | |
332 | * | |
333 | * This function disables the output polling work. | |
334 | * | |
335 | * Drivers can call this helper from their device suspend implementation. It is | |
336 | * not an error to call this even when output polling isn't enabled or arlready | |
337 | * disabled. | |
338 | */ | |
339 | void drm_kms_helper_poll_disable(struct drm_device *dev) | |
340 | { | |
341 | if (!dev->mode_config.poll_enabled) | |
342 | return; | |
343 | cancel_delayed_work_sync(&dev->mode_config.output_poll_work); | |
344 | } | |
345 | EXPORT_SYMBOL(drm_kms_helper_poll_disable); | |
346 | ||
347 | /** | |
348 | * drm_kms_helper_poll_enable - re-enable output polling. | |
349 | * @dev: drm_device | |
350 | * | |
351 | * This function re-enables the output polling work. | |
352 | * | |
353 | * Drivers can call this helper from their device resume implementation. It is | |
354 | * an error to call this when the output polling support has not yet been set | |
355 | * up. | |
356 | */ | |
357 | void drm_kms_helper_poll_enable(struct drm_device *dev) | |
358 | { | |
359 | bool poll = false; | |
360 | struct drm_connector *connector; | |
361 | ||
362 | if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll) | |
363 | return; | |
364 | ||
365 | list_for_each_entry(connector, &dev->mode_config.connector_list, head) { | |
366 | if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | | |
367 | DRM_CONNECTOR_POLL_DISCONNECT)) | |
368 | poll = true; | |
369 | } | |
370 | ||
371 | if (poll) | |
372 | schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD); | |
373 | } | |
374 | EXPORT_SYMBOL(drm_kms_helper_poll_enable); | |
375 | ||
376 | /** | |
377 | * drm_kms_helper_poll_init - initialize and enable output polling | |
378 | * @dev: drm_device | |
379 | * | |
380 | * This function intializes and then also enables output polling support for | |
381 | * @dev. Drivers which do not have reliable hotplug support in hardware can use | |
382 | * this helper infrastructure to regularly poll such connectors for changes in | |
383 | * their connection state. | |
384 | * | |
385 | * Drivers can control which connectors are polled by setting the | |
386 | * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On | |
387 | * connectors where probing live outputs can result in visual distortion drivers | |
388 | * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this. | |
389 | * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are | |
390 | * completely ignored by the polling logic. | |
391 | * | |
392 | * Note that a connector can be both polled and probed from the hotplug handler, | |
393 | * in case the hotplug interrupt is known to be unreliable. | |
394 | */ | |
395 | void drm_kms_helper_poll_init(struct drm_device *dev) | |
396 | { | |
397 | INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute); | |
398 | dev->mode_config.poll_enabled = true; | |
399 | ||
400 | drm_kms_helper_poll_enable(dev); | |
401 | } | |
402 | EXPORT_SYMBOL(drm_kms_helper_poll_init); | |
403 | ||
404 | /** | |
405 | * drm_kms_helper_poll_fini - disable output polling and clean it up | |
406 | * @dev: drm_device | |
407 | */ | |
408 | void drm_kms_helper_poll_fini(struct drm_device *dev) | |
409 | { | |
410 | drm_kms_helper_poll_disable(dev); | |
411 | } | |
412 | EXPORT_SYMBOL(drm_kms_helper_poll_fini); | |
413 | ||
414 | /** | |
415 | * drm_helper_hpd_irq_event - hotplug processing | |
416 | * @dev: drm_device | |
417 | * | |
418 | * Drivers can use this helper function to run a detect cycle on all connectors | |
419 | * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All | |
420 | * other connectors are ignored, which is useful to avoid reprobing fixed | |
421 | * panels. | |
422 | * | |
423 | * This helper function is useful for drivers which can't or don't track hotplug | |
424 | * interrupts for each connector. | |
425 | * | |
426 | * Drivers which support hotplug interrupts for each connector individually and | |
427 | * which have a more fine-grained detect logic should bypass this code and | |
428 | * directly call drm_kms_helper_hotplug_event() in case the connector state | |
429 | * changed. | |
430 | * | |
431 | * This function must be called from process context with no mode | |
432 | * setting locks held. | |
433 | * | |
434 | * Note that a connector can be both polled and probed from the hotplug handler, | |
435 | * in case the hotplug interrupt is known to be unreliable. | |
436 | */ | |
437 | bool drm_helper_hpd_irq_event(struct drm_device *dev) | |
438 | { | |
439 | struct drm_connector *connector; | |
440 | enum drm_connector_status old_status; | |
441 | bool changed = false; | |
442 | ||
443 | if (!dev->mode_config.poll_enabled) | |
444 | return false; | |
445 | ||
446 | mutex_lock(&dev->mode_config.mutex); | |
447 | list_for_each_entry(connector, &dev->mode_config.connector_list, head) { | |
448 | ||
449 | /* Only handle HPD capable connectors. */ | |
450 | if (!(connector->polled & DRM_CONNECTOR_POLL_HPD)) | |
451 | continue; | |
452 | ||
453 | old_status = connector->status; | |
454 | ||
455 | connector->status = connector->funcs->detect(connector, false); | |
456 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", | |
457 | connector->base.id, | |
25933820 | 458 | connector->name, |
8d754544 DV |
459 | drm_get_connector_status_name(old_status), |
460 | drm_get_connector_status_name(connector->status)); | |
461 | if (old_status != connector->status) | |
462 | changed = true; | |
463 | } | |
464 | ||
465 | mutex_unlock(&dev->mode_config.mutex); | |
466 | ||
467 | if (changed) | |
468 | drm_kms_helper_hotplug_event(dev); | |
469 | ||
470 | return changed; | |
471 | } | |
472 | EXPORT_SYMBOL(drm_helper_hpd_irq_event); |