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