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