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