blob: e70f54d4a5810cec31f2c09a9a5e81a0bb1fe343 [file] [log] [blame]
Daniel Vetter8d754542014-04-10 10:51:11 +02001/*
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
58static bool drm_kms_helper_poll = true;
59module_param_named(poll, drm_kms_helper_poll, bool, 0600);
60
61static 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 */
103int 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
177prune:
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}
197EXPORT_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 */
215void 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}
222EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
223
224#define DRM_OUTPUT_POLL_PERIOD (10*HZ)
225static 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 */
293void 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}
299EXPORT_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 */
311void 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}
328EXPORT_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 */
349void 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}
356EXPORT_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 */
362void drm_kms_helper_poll_fini(struct drm_device *dev)
363{
364 drm_kms_helper_poll_disable(dev);
365}
366EXPORT_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 */
391bool 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}
426EXPORT_SYMBOL(drm_helper_hpd_irq_event);