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