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