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 <uapi_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 enum drm_mode_status 62 drm_mode_validate_flag(const struct drm_display_mode *mode, 63 int flags) 64 { 65 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) && 66 !(flags & DRM_MODE_FLAG_INTERLACE)) 67 return MODE_NO_INTERLACE; 68 69 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) && 70 !(flags & DRM_MODE_FLAG_DBLSCAN)) 71 return MODE_NO_DBLESCAN; 72 73 if ((mode->flags & DRM_MODE_FLAG_3D_MASK) && 74 !(flags & DRM_MODE_FLAG_3D_MASK)) 75 return MODE_NO_STEREO; 76 77 return MODE_OK; 78 } 79 80 static int drm_helper_probe_add_cmdline_mode(struct drm_connector *connector) 81 { 82 struct drm_display_mode *mode; 83 84 if (!connector->cmdline_mode.specified) 85 return 0; 86 87 mode = drm_mode_create_from_cmdline_mode(connector->dev, 88 &connector->cmdline_mode); 89 if (mode == NULL) 90 return 0; 91 92 drm_mode_probed_add(connector, mode); 93 return 1; 94 } 95 96 #define DRM_OUTPUT_POLL_PERIOD (10*HZ) 97 /** 98 * drm_kms_helper_poll_enable_locked - re-enable output polling. 99 * @dev: drm_device 100 * 101 * This function re-enables the output polling work without 102 * locking the mode_config mutex. 103 * 104 * This is like drm_kms_helper_poll_enable() however it is to be 105 * called from a context where the mode_config mutex is locked 106 * already. 107 */ 108 void drm_kms_helper_poll_enable_locked(struct drm_device *dev) 109 { 110 bool poll = false; 111 struct drm_connector *connector; 112 113 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 114 115 if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll) 116 return; 117 118 drm_for_each_connector(connector, dev) { 119 if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | 120 DRM_CONNECTOR_POLL_DISCONNECT)) 121 poll = true; 122 } 123 124 if (poll) 125 schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD); 126 } 127 EXPORT_SYMBOL(drm_kms_helper_poll_enable_locked); 128 129 130 static int drm_helper_probe_single_connector_modes_merge_bits(struct drm_connector *connector, 131 uint32_t maxX, uint32_t maxY, bool merge_type_bits) 132 { 133 struct drm_device *dev = connector->dev; 134 struct drm_display_mode *mode; 135 const struct drm_connector_helper_funcs *connector_funcs = 136 connector->helper_private; 137 int count = 0; 138 int mode_flags = 0; 139 bool verbose_prune = true; 140 141 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 142 143 DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, 144 connector->name); 145 /* set all modes to the unverified state */ 146 list_for_each_entry(mode, &connector->modes, head) 147 mode->status = MODE_UNVERIFIED; 148 149 if (connector->force) { 150 if (connector->force == DRM_FORCE_ON || 151 connector->force == DRM_FORCE_ON_DIGITAL) 152 connector->status = connector_status_connected; 153 else 154 connector->status = connector_status_disconnected; 155 if (connector->funcs->force) 156 connector->funcs->force(connector); 157 } else { 158 connector->status = connector->funcs->detect(connector, true); 159 } 160 161 /* Re-enable polling in case the global poll config changed. */ 162 if (drm_kms_helper_poll != dev->mode_config.poll_running) 163 drm_kms_helper_poll_enable_locked(dev); 164 165 dev->mode_config.poll_running = drm_kms_helper_poll; 166 167 if (connector->status == connector_status_disconnected) { 168 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n", 169 connector->base.id, connector->name); 170 drm_mode_connector_update_edid_property(connector, NULL); 171 verbose_prune = false; 172 goto prune; 173 } 174 175 #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE 176 count = drm_load_edid_firmware(connector); 177 if (count == 0) 178 #endif 179 { 180 if (connector->override_edid) { 181 struct edid *edid = (struct edid *) connector->edid_blob_ptr->data; 182 183 count = drm_add_edid_modes(connector, edid); 184 } else 185 count = (*connector_funcs->get_modes)(connector); 186 } 187 188 if (count == 0 && connector->status == connector_status_connected) 189 count = drm_add_modes_noedid(connector, 1024, 768); 190 count += drm_helper_probe_add_cmdline_mode(connector); 191 if (count == 0) 192 goto prune; 193 194 drm_mode_connector_list_update(connector, merge_type_bits); 195 196 if (connector->interlace_allowed) 197 mode_flags |= DRM_MODE_FLAG_INTERLACE; 198 if (connector->doublescan_allowed) 199 mode_flags |= DRM_MODE_FLAG_DBLSCAN; 200 if (connector->stereo_allowed) 201 mode_flags |= DRM_MODE_FLAG_3D_MASK; 202 203 list_for_each_entry(mode, &connector->modes, head) { 204 if (mode->status == MODE_OK) 205 mode->status = drm_mode_validate_basic(mode); 206 207 if (mode->status == MODE_OK) 208 mode->status = drm_mode_validate_size(mode, maxX, maxY); 209 210 if (mode->status == MODE_OK) 211 mode->status = drm_mode_validate_flag(mode, mode_flags); 212 213 if (mode->status == MODE_OK && connector_funcs->mode_valid) 214 mode->status = connector_funcs->mode_valid(connector, 215 mode); 216 } 217 218 prune: 219 drm_mode_prune_invalid(dev, &connector->modes, verbose_prune); 220 221 if (list_empty(&connector->modes)) 222 return 0; 223 224 list_for_each_entry(mode, &connector->modes, head) 225 mode->vrefresh = drm_mode_vrefresh(mode); 226 227 drm_mode_sort(&connector->modes); 228 229 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id, 230 connector->name); 231 list_for_each_entry(mode, &connector->modes, head) { 232 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V); 233 drm_mode_debug_printmodeline(mode); 234 } 235 236 return count; 237 } 238 239 /** 240 * drm_helper_probe_single_connector_modes - get complete set of display modes 241 * @connector: connector to probe 242 * @maxX: max width for modes 243 * @maxY: max height for modes 244 * 245 * Based on the helper callbacks implemented by @connector try to detect all 246 * valid modes. Modes will first be added to the connector's probed_modes list, 247 * then culled (based on validity and the @maxX, @maxY parameters) and put into 248 * the normal modes list. 249 * 250 * Intended to be use as a generic implementation of the ->fill_modes() 251 * @connector vfunc for drivers that use the crtc helpers for output mode 252 * filtering and detection. 253 * 254 * Returns: 255 * The number of modes found on @connector. 256 */ 257 int drm_helper_probe_single_connector_modes(struct drm_connector *connector, 258 uint32_t maxX, uint32_t maxY) 259 { 260 return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, true); 261 } 262 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes); 263 264 /** 265 * drm_helper_probe_single_connector_modes_nomerge - get complete set of display modes 266 * @connector: connector to probe 267 * @maxX: max width for modes 268 * @maxY: max height for modes 269 * 270 * This operates like drm_hehlper_probe_single_connector_modes except it 271 * replaces the mode bits instead of merging them for preferred modes. 272 */ 273 int drm_helper_probe_single_connector_modes_nomerge(struct drm_connector *connector, 274 uint32_t maxX, uint32_t maxY) 275 { 276 return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, false); 277 } 278 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes_nomerge); 279 280 /** 281 * drm_kms_helper_hotplug_event - fire off KMS hotplug events 282 * @dev: drm_device whose connector state changed 283 * 284 * This function fires off the uevent for userspace and also calls the 285 * output_poll_changed function, which is most commonly used to inform the fbdev 286 * emulation code and allow it to update the fbcon output configuration. 287 * 288 * Drivers should call this from their hotplug handling code when a change is 289 * detected. Note that this function does not do any output detection of its 290 * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the 291 * driver already. 292 * 293 * This function must be called from process context with no mode 294 * setting locks held. 295 */ 296 void drm_kms_helper_hotplug_event(struct drm_device *dev) 297 { 298 /* send a uevent + call fbdev */ 299 drm_sysfs_hotplug_event(dev); 300 if (dev->mode_config.funcs->output_poll_changed) 301 dev->mode_config.funcs->output_poll_changed(dev); 302 } 303 EXPORT_SYMBOL(drm_kms_helper_hotplug_event); 304 305 static void output_poll_execute(struct work_struct *work) 306 { 307 struct delayed_work *delayed_work = to_delayed_work(work); 308 struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work); 309 struct drm_connector *connector; 310 enum drm_connector_status old_status; 311 bool repoll = false, changed = false; 312 313 if (!drm_kms_helper_poll) 314 return; 315 316 mutex_lock(&dev->mode_config.mutex); 317 drm_for_each_connector(connector, dev) { 318 319 /* Ignore forced connectors. */ 320 if (connector->force) 321 continue; 322 323 /* Ignore HPD capable connectors and connectors where we don't 324 * want any hotplug detection at all for polling. */ 325 if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD) 326 continue; 327 328 old_status = connector->status; 329 /* if we are connected and don't want to poll for disconnect 330 skip it */ 331 if (old_status == connector_status_connected && 332 !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT)) 333 continue; 334 335 repoll = true; 336 337 connector->status = connector->funcs->detect(connector, false); 338 if (old_status != connector->status) { 339 const char *old, *new; 340 341 old = drm_get_connector_status_name(old_status); 342 new = drm_get_connector_status_name(connector->status); 343 344 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] " 345 "status updated from %s to %s\n", 346 connector->base.id, 347 connector->name, 348 old, new); 349 350 changed = true; 351 } 352 } 353 354 mutex_unlock(&dev->mode_config.mutex); 355 356 if (changed) 357 drm_kms_helper_hotplug_event(dev); 358 359 if (repoll) 360 schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD); 361 } 362 363 /** 364 * drm_kms_helper_poll_disable - disable output polling 365 * @dev: drm_device 366 * 367 * This function disables the output polling work. 368 * 369 * Drivers can call this helper from their device suspend implementation. It is 370 * not an error to call this even when output polling isn't enabled or arlready 371 * disabled. 372 */ 373 void drm_kms_helper_poll_disable(struct drm_device *dev) 374 { 375 if (!dev->mode_config.poll_enabled) 376 return; 377 cancel_delayed_work_sync(&dev->mode_config.output_poll_work); 378 } 379 EXPORT_SYMBOL(drm_kms_helper_poll_disable); 380 381 /** 382 * drm_kms_helper_poll_enable - re-enable output polling. 383 * @dev: drm_device 384 * 385 * This function re-enables the output polling work. 386 * 387 * Drivers can call this helper from their device resume implementation. It is 388 * an error to call this when the output polling support has not yet been set 389 * up. 390 */ 391 void drm_kms_helper_poll_enable(struct drm_device *dev) 392 { 393 mutex_lock(&dev->mode_config.mutex); 394 drm_kms_helper_poll_enable_locked(dev); 395 mutex_unlock(&dev->mode_config.mutex); 396 } 397 EXPORT_SYMBOL(drm_kms_helper_poll_enable); 398 399 /** 400 * drm_kms_helper_poll_init - initialize and enable output polling 401 * @dev: drm_device 402 * 403 * This function intializes and then also enables output polling support for 404 * @dev. Drivers which do not have reliable hotplug support in hardware can use 405 * this helper infrastructure to regularly poll such connectors for changes in 406 * their connection state. 407 * 408 * Drivers can control which connectors are polled by setting the 409 * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On 410 * connectors where probing live outputs can result in visual distortion drivers 411 * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this. 412 * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are 413 * completely ignored by the polling logic. 414 * 415 * Note that a connector can be both polled and probed from the hotplug handler, 416 * in case the hotplug interrupt is known to be unreliable. 417 */ 418 void drm_kms_helper_poll_init(struct drm_device *dev) 419 { 420 INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute); 421 dev->mode_config.poll_enabled = true; 422 423 drm_kms_helper_poll_enable(dev); 424 } 425 EXPORT_SYMBOL(drm_kms_helper_poll_init); 426 427 /** 428 * drm_kms_helper_poll_fini - disable output polling and clean it up 429 * @dev: drm_device 430 */ 431 void drm_kms_helper_poll_fini(struct drm_device *dev) 432 { 433 drm_kms_helper_poll_disable(dev); 434 } 435 EXPORT_SYMBOL(drm_kms_helper_poll_fini); 436 437 /** 438 * drm_helper_hpd_irq_event - hotplug processing 439 * @dev: drm_device 440 * 441 * Drivers can use this helper function to run a detect cycle on all connectors 442 * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All 443 * other connectors are ignored, which is useful to avoid reprobing fixed 444 * panels. 445 * 446 * This helper function is useful for drivers which can't or don't track hotplug 447 * interrupts for each connector. 448 * 449 * Drivers which support hotplug interrupts for each connector individually and 450 * which have a more fine-grained detect logic should bypass this code and 451 * directly call drm_kms_helper_hotplug_event() in case the connector state 452 * changed. 453 * 454 * This function must be called from process context with no mode 455 * setting locks held. 456 * 457 * Note that a connector can be both polled and probed from the hotplug handler, 458 * in case the hotplug interrupt is known to be unreliable. 459 */ 460 bool drm_helper_hpd_irq_event(struct drm_device *dev) 461 { 462 struct drm_connector *connector; 463 enum drm_connector_status old_status; 464 bool changed = false; 465 466 if (!dev->mode_config.poll_enabled) 467 return false; 468 469 mutex_lock(&dev->mode_config.mutex); 470 drm_for_each_connector(connector, dev) { 471 472 /* Only handle HPD capable connectors. */ 473 if (!(connector->polled & DRM_CONNECTOR_POLL_HPD)) 474 continue; 475 476 old_status = connector->status; 477 478 connector->status = connector->funcs->detect(connector, false); 479 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", 480 connector->base.id, 481 connector->name, 482 drm_get_connector_status_name(old_status), 483 drm_get_connector_status_name(connector->status)); 484 if (old_status != connector->status) 485 changed = true; 486 } 487 488 mutex_unlock(&dev->mode_config.mutex); 489 490 if (changed) 491 drm_kms_helper_hotplug_event(dev); 492 493 return changed; 494 } 495 EXPORT_SYMBOL(drm_helper_hpd_irq_event); 496