2 * Copyright (c) 2006-2008 Intel Corporation
3 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
5 * DRM core CRTC related functions
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.
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
27 * Eric Anholt <eric@anholt.net>
28 * Dave Airlie <airlied@linux.ie>
29 * Jesse Barnes <jesse.barnes@intel.com>
32 #include <linux/export.h>
33 #include <linux/moduleparam.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>
43 * DOC: output probing helper overview
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.
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.
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.
58 static bool drm_kms_helper_poll = true;
59 module_param_named(poll, drm_kms_helper_poll, bool, 0600);
61 static enum drm_mode_status
62 drm_mode_validate_flag(const struct drm_display_mode *mode,
65 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
66 !(flags & DRM_MODE_FLAG_INTERLACE))
67 return MODE_NO_INTERLACE;
69 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
70 !(flags & DRM_MODE_FLAG_DBLSCAN))
71 return MODE_NO_DBLESCAN;
73 if ((mode->flags & DRM_MODE_FLAG_3D_MASK) &&
74 !(flags & DRM_MODE_FLAG_3D_MASK))
75 return MODE_NO_STEREO;
80 static int drm_helper_probe_add_cmdline_mode(struct drm_connector *connector)
82 struct drm_display_mode *mode;
84 if (!connector->cmdline_mode.specified)
87 mode = drm_mode_create_from_cmdline_mode(connector->dev,
88 &connector->cmdline_mode);
92 drm_mode_probed_add(connector, mode);
96 static int drm_helper_probe_single_connector_modes_merge_bits(struct drm_connector *connector,
97 uint32_t maxX, uint32_t maxY, bool merge_type_bits)
99 struct drm_device *dev = connector->dev;
100 struct drm_display_mode *mode;
101 struct drm_connector_helper_funcs *connector_funcs =
102 connector->helper_private;
105 bool verbose_prune = true;
107 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
109 DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
111 /* set all modes to the unverified state */
112 list_for_each_entry(mode, &connector->modes, head)
113 mode->status = MODE_UNVERIFIED;
115 if (connector->force) {
116 if (connector->force == DRM_FORCE_ON ||
117 connector->force == DRM_FORCE_ON_DIGITAL)
118 connector->status = connector_status_connected;
120 connector->status = connector_status_disconnected;
121 if (connector->funcs->force)
122 connector->funcs->force(connector);
124 connector->status = connector->funcs->detect(connector, true);
127 /* Re-enable polling in case the global poll config changed. */
128 if (drm_kms_helper_poll != dev->mode_config.poll_running)
129 drm_kms_helper_poll_enable(dev);
131 dev->mode_config.poll_running = drm_kms_helper_poll;
133 if (connector->status == connector_status_disconnected) {
134 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
135 connector->base.id, connector->name);
136 drm_mode_connector_update_edid_property(connector, NULL);
137 verbose_prune = false;
141 #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
142 count = drm_load_edid_firmware(connector);
146 if (connector->override_edid) {
147 struct edid *edid = (struct edid *) connector->edid_blob_ptr->data;
149 count = drm_add_edid_modes(connector, edid);
151 count = (*connector_funcs->get_modes)(connector);
154 if (count == 0 && connector->status == connector_status_connected)
155 count = drm_add_modes_noedid(connector, 1024, 768);
156 count += drm_helper_probe_add_cmdline_mode(connector);
160 drm_mode_connector_list_update(connector, merge_type_bits);
162 if (connector->interlace_allowed)
163 mode_flags |= DRM_MODE_FLAG_INTERLACE;
164 if (connector->doublescan_allowed)
165 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
166 if (connector->stereo_allowed)
167 mode_flags |= DRM_MODE_FLAG_3D_MASK;
169 list_for_each_entry(mode, &connector->modes, head) {
170 mode->status = drm_mode_validate_size(mode, maxX, maxY);
172 if (mode->status == MODE_OK)
173 mode->status = drm_mode_validate_flag(mode, mode_flags);
175 if (mode->status == MODE_OK && connector_funcs->mode_valid)
176 mode->status = connector_funcs->mode_valid(connector,
181 drm_mode_prune_invalid(dev, &connector->modes, verbose_prune);
183 if (list_empty(&connector->modes))
186 list_for_each_entry(mode, &connector->modes, head)
187 mode->vrefresh = drm_mode_vrefresh(mode);
189 drm_mode_sort(&connector->modes);
191 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
193 list_for_each_entry(mode, &connector->modes, head) {
194 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
195 drm_mode_debug_printmodeline(mode);
202 * drm_helper_probe_single_connector_modes - get complete set of display modes
203 * @connector: connector to probe
204 * @maxX: max width for modes
205 * @maxY: max height for modes
207 * Based on the helper callbacks implemented by @connector try to detect all
208 * valid modes. Modes will first be added to the connector's probed_modes list,
209 * then culled (based on validity and the @maxX, @maxY parameters) and put into
210 * the normal modes list.
212 * Intended to be use as a generic implementation of the ->fill_modes()
213 * @connector vfunc for drivers that use the crtc helpers for output mode
214 * filtering and detection.
217 * The number of modes found on @connector.
219 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
220 uint32_t maxX, uint32_t maxY)
222 return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, true);
224 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
227 * drm_helper_probe_single_connector_modes_nomerge - get complete set of display modes
228 * @connector: connector to probe
229 * @maxX: max width for modes
230 * @maxY: max height for modes
232 * This operates like drm_hehlper_probe_single_connector_modes except it
233 * replaces the mode bits instead of merging them for preferred modes.
235 int drm_helper_probe_single_connector_modes_nomerge(struct drm_connector *connector,
236 uint32_t maxX, uint32_t maxY)
238 return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, false);
240 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes_nomerge);
243 * drm_kms_helper_hotplug_event - fire off KMS hotplug events
244 * @dev: drm_device whose connector state changed
246 * This function fires off the uevent for userspace and also calls the
247 * output_poll_changed function, which is most commonly used to inform the fbdev
248 * emulation code and allow it to update the fbcon output configuration.
250 * Drivers should call this from their hotplug handling code when a change is
251 * detected. Note that this function does not do any output detection of its
252 * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the
255 * This function must be called from process context with no mode
256 * setting locks held.
258 void drm_kms_helper_hotplug_event(struct drm_device *dev)
260 /* send a uevent + call fbdev */
261 drm_sysfs_hotplug_event(dev);
262 if (dev->mode_config.funcs->output_poll_changed)
263 dev->mode_config.funcs->output_poll_changed(dev);
265 EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
267 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
268 static void output_poll_execute(struct work_struct *work)
270 struct delayed_work *delayed_work = to_delayed_work(work);
271 struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
272 struct drm_connector *connector;
273 enum drm_connector_status old_status;
274 bool repoll = false, changed = false;
276 if (!drm_kms_helper_poll)
279 mutex_lock(&dev->mode_config.mutex);
280 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
282 /* Ignore forced connectors. */
283 if (connector->force)
286 /* Ignore HPD capable connectors and connectors where we don't
287 * want any hotplug detection at all for polling. */
288 if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
293 old_status = connector->status;
294 /* if we are connected and don't want to poll for disconnect
296 if (old_status == connector_status_connected &&
297 !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
300 connector->status = connector->funcs->detect(connector, false);
301 if (old_status != connector->status) {
302 const char *old, *new;
304 old = drm_get_connector_status_name(old_status);
305 new = drm_get_connector_status_name(connector->status);
307 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
308 "status updated from %s to %s\n",
317 mutex_unlock(&dev->mode_config.mutex);
320 drm_kms_helper_hotplug_event(dev);
323 schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
327 * drm_kms_helper_poll_disable - disable output polling
330 * This function disables the output polling work.
332 * Drivers can call this helper from their device suspend implementation. It is
333 * not an error to call this even when output polling isn't enabled or arlready
336 void drm_kms_helper_poll_disable(struct drm_device *dev)
338 if (!dev->mode_config.poll_enabled)
340 cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
342 EXPORT_SYMBOL(drm_kms_helper_poll_disable);
345 * drm_kms_helper_poll_enable - re-enable output polling.
348 * This function re-enables the output polling work.
350 * Drivers can call this helper from their device resume implementation. It is
351 * an error to call this when the output polling support has not yet been set
354 void drm_kms_helper_poll_enable(struct drm_device *dev)
357 struct drm_connector *connector;
359 if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
362 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
363 if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
364 DRM_CONNECTOR_POLL_DISCONNECT))
369 schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
371 EXPORT_SYMBOL(drm_kms_helper_poll_enable);
374 * drm_kms_helper_poll_init - initialize and enable output polling
377 * This function intializes and then also enables output polling support for
378 * @dev. Drivers which do not have reliable hotplug support in hardware can use
379 * this helper infrastructure to regularly poll such connectors for changes in
380 * their connection state.
382 * Drivers can control which connectors are polled by setting the
383 * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On
384 * connectors where probing live outputs can result in visual distortion drivers
385 * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this.
386 * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are
387 * completely ignored by the polling logic.
389 * Note that a connector can be both polled and probed from the hotplug handler,
390 * in case the hotplug interrupt is known to be unreliable.
392 void drm_kms_helper_poll_init(struct drm_device *dev)
394 INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
395 dev->mode_config.poll_enabled = true;
397 drm_kms_helper_poll_enable(dev);
399 EXPORT_SYMBOL(drm_kms_helper_poll_init);
402 * drm_kms_helper_poll_fini - disable output polling and clean it up
405 void drm_kms_helper_poll_fini(struct drm_device *dev)
407 drm_kms_helper_poll_disable(dev);
409 EXPORT_SYMBOL(drm_kms_helper_poll_fini);
412 * drm_helper_hpd_irq_event - hotplug processing
415 * Drivers can use this helper function to run a detect cycle on all connectors
416 * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All
417 * other connectors are ignored, which is useful to avoid reprobing fixed
420 * This helper function is useful for drivers which can't or don't track hotplug
421 * interrupts for each connector.
423 * Drivers which support hotplug interrupts for each connector individually and
424 * which have a more fine-grained detect logic should bypass this code and
425 * directly call drm_kms_helper_hotplug_event() in case the connector state
428 * This function must be called from process context with no mode
429 * setting locks held.
431 * Note that a connector can be both polled and probed from the hotplug handler,
432 * in case the hotplug interrupt is known to be unreliable.
434 bool drm_helper_hpd_irq_event(struct drm_device *dev)
436 struct drm_connector *connector;
437 enum drm_connector_status old_status;
438 bool changed = false;
440 if (!dev->mode_config.poll_enabled)
443 mutex_lock(&dev->mode_config.mutex);
444 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
446 /* Only handle HPD capable connectors. */
447 if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
450 old_status = connector->status;
452 connector->status = connector->funcs->detect(connector, false);
453 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
456 drm_get_connector_status_name(old_status),
457 drm_get_connector_status_name(connector->status));
458 if (old_status != connector->status)
462 mutex_unlock(&dev->mode_config.mutex);
465 drm_kms_helper_hotplug_event(dev);
469 EXPORT_SYMBOL(drm_helper_hpd_irq_event);