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 <asm/param.h> 33 #include <linux/export.h> 34 #include <linux/moduleparam.h> 35 36 #include <drm/drmP.h> 37 #include <drm/drm_crtc.h> 38 #include <drm/drm_fourcc.h> 39 #include <drm/drm_crtc_helper.h> 40 #include <drm/drm_fb_helper.h> 41 #include <drm/drm_edid.h> 42 43 /** 44 * DOC: output probing helper overview 45 * 46 * This library provides some helper code for output probing. It provides an 47 * implementation of the core connector->fill_modes interface with 48 * drm_helper_probe_single_connector_modes. 49 * 50 * It also provides support for polling connectors with a work item and for 51 * generic hotplug interrupt handling where the driver doesn't or cannot keep 52 * track of a per-connector hpd interrupt. 53 * 54 * This helper library can be used independently of the modeset helper library. 55 * Drivers can also overwrite different parts e.g. use their own hotplug 56 * handling code to avoid probing unrelated outputs. 57 */ 58 59 static bool drm_kms_helper_poll = true; 60 module_param_named(poll, drm_kms_helper_poll, bool, 0600); 61 62 static void drm_mode_validate_flag(struct drm_connector *connector, 63 int flags) 64 { 65 struct drm_display_mode *mode; 66 67 if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE | 68 DRM_MODE_FLAG_3D_MASK)) 69 return; 70 71 list_for_each_entry(mode, &connector->modes, head) { 72 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) && 73 !(flags & DRM_MODE_FLAG_INTERLACE)) 74 mode->status = MODE_NO_INTERLACE; 75 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) && 76 !(flags & DRM_MODE_FLAG_DBLSCAN)) 77 mode->status = MODE_NO_DBLESCAN; 78 if ((mode->flags & DRM_MODE_FLAG_3D_MASK) && 79 !(flags & DRM_MODE_FLAG_3D_MASK)) 80 mode->status = MODE_NO_STEREO; 81 } 82 83 return; 84 } 85 86 /** 87 * drm_helper_probe_single_connector_modes - get complete set of display modes 88 * @connector: connector to probe 89 * @maxX: max width for modes 90 * @maxY: max height for modes 91 * 92 * Based on the helper callbacks implemented by @connector try to detect all 93 * valid modes. Modes will first be added to the connector's probed_modes list, 94 * then culled (based on validity and the @maxX, @maxY parameters) and put into 95 * the normal modes list. 96 * 97 * Intended to be use as a generic implementation of the ->fill_modes() 98 * @connector vfunc for drivers that use the crtc helpers for output mode 99 * filtering and detection. 100 * 101 * Returns: 102 * The number of modes found on @connector. 103 */ 104 int drm_helper_probe_single_connector_modes(struct drm_connector *connector, 105 uint32_t maxX, uint32_t maxY) 106 { 107 struct drm_device *dev = connector->dev; 108 struct drm_display_mode *mode; 109 struct drm_connector_helper_funcs *connector_funcs = 110 connector->helper_private; 111 int count = 0; 112 int mode_flags = 0; 113 bool verbose_prune = true; 114 115 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 116 117 DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, 118 drm_get_connector_name(connector)); 119 /* set all modes to the unverified state */ 120 list_for_each_entry(mode, &connector->modes, head) 121 mode->status = MODE_UNVERIFIED; 122 123 if (connector->force) { 124 if (connector->force == DRM_FORCE_ON) 125 connector->status = connector_status_connected; 126 else 127 connector->status = connector_status_disconnected; 128 if (connector->funcs->force) 129 connector->funcs->force(connector); 130 } else { 131 connector->status = connector->funcs->detect(connector, true); 132 } 133 134 /* Re-enable polling in case the global poll config changed. */ 135 if (drm_kms_helper_poll != dev->mode_config.poll_running) 136 drm_kms_helper_poll_enable(dev); 137 138 dev->mode_config.poll_running = drm_kms_helper_poll; 139 140 if (connector->status == connector_status_disconnected) { 141 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n", 142 connector->base.id, drm_get_connector_name(connector)); 143 drm_mode_connector_update_edid_property(connector, NULL); 144 verbose_prune = false; 145 goto prune; 146 } 147 148 #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE 149 count = drm_load_edid_firmware(connector); 150 if (count == 0) 151 #endif 152 count = (*connector_funcs->get_modes)(connector); 153 154 if (count == 0 && connector->status == connector_status_connected) 155 count = drm_add_modes_noedid(connector, 1024, 768); 156 if (count == 0) 157 goto prune; 158 159 drm_mode_connector_list_update(connector); 160 161 if (maxX && maxY) 162 drm_mode_validate_size(dev, &connector->modes, maxX, maxY); 163 164 if (connector->interlace_allowed) 165 mode_flags |= DRM_MODE_FLAG_INTERLACE; 166 if (connector->doublescan_allowed) 167 mode_flags |= DRM_MODE_FLAG_DBLSCAN; 168 if (connector->stereo_allowed) 169 mode_flags |= DRM_MODE_FLAG_3D_MASK; 170 drm_mode_validate_flag(connector, mode_flags); 171 172 list_for_each_entry(mode, &connector->modes, head) { 173 if (mode->status == MODE_OK) 174 mode->status = connector_funcs->mode_valid(connector, 175 mode); 176 } 177 178 prune: 179 drm_mode_prune_invalid(dev, &connector->modes, verbose_prune); 180 181 if (list_empty(&connector->modes)) 182 return 0; 183 184 list_for_each_entry(mode, &connector->modes, head) 185 mode->vrefresh = drm_mode_vrefresh(mode); 186 187 drm_mode_sort(&connector->modes); 188 189 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id, 190 drm_get_connector_name(connector)); 191 list_for_each_entry(mode, &connector->modes, head) { 192 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V); 193 drm_mode_debug_printmodeline(mode); 194 } 195 196 return count; 197 } 198 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes); 199 200 /** 201 * drm_kms_helper_hotplug_event - fire off KMS hotplug events 202 * @dev: drm_device whose connector state changed 203 * 204 * This function fires off the uevent for userspace and also calls the 205 * output_poll_changed function, which is most commonly used to inform the fbdev 206 * emulation code and allow it to update the fbcon output configuration. 207 * 208 * Drivers should call this from their hotplug handling code when a change is 209 * detected. Note that this function does not do any output detection of its 210 * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the 211 * driver already. 212 * 213 * This function must be called from process context with no mode 214 * setting locks held. 215 */ 216 void drm_kms_helper_hotplug_event(struct drm_device *dev) 217 { 218 /* send a uevent + call fbdev */ 219 drm_sysfs_hotplug_event(dev); 220 if (dev->mode_config.funcs->output_poll_changed) 221 dev->mode_config.funcs->output_poll_changed(dev); 222 } 223 EXPORT_SYMBOL(drm_kms_helper_hotplug_event); 224 225 #define DRM_OUTPUT_POLL_PERIOD (10*HZ) 226 static void output_poll_execute(struct work_struct *work) 227 { 228 struct delayed_work *delayed_work = to_delayed_work(work); 229 struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work); 230 struct drm_connector *connector; 231 enum drm_connector_status old_status; 232 bool repoll = false, changed = false; 233 234 if (!drm_kms_helper_poll) 235 return; 236 237 mutex_lock(&dev->mode_config.mutex); 238 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 239 240 /* Ignore forced connectors. */ 241 if (connector->force) 242 continue; 243 244 /* Ignore HPD capable connectors and connectors where we don't 245 * want any hotplug detection at all for polling. */ 246 if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD) 247 continue; 248 249 repoll = true; 250 251 old_status = connector->status; 252 /* if we are connected and don't want to poll for disconnect 253 skip it */ 254 if (old_status == connector_status_connected && 255 !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT)) 256 continue; 257 258 connector->status = connector->funcs->detect(connector, false); 259 if (old_status != connector->status) { 260 const char *old, *new; 261 262 old = drm_get_connector_status_name(old_status); 263 new = drm_get_connector_status_name(connector->status); 264 265 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] " 266 "status updated from %s to %s\n", 267 connector->base.id, 268 drm_get_connector_name(connector), 269 old, new); 270 271 changed = true; 272 } 273 } 274 275 mutex_unlock(&dev->mode_config.mutex); 276 277 if (changed) 278 drm_kms_helper_hotplug_event(dev); 279 280 if (repoll) 281 schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD); 282 } 283 284 /** 285 * drm_kms_helper_poll_disable - disable output polling 286 * @dev: drm_device 287 * 288 * This function disables the output polling work. 289 * 290 * Drivers can call this helper from their device suspend implementation. It is 291 * not an error to call this even when output polling isn't enabled or arlready 292 * disabled. 293 */ 294 void drm_kms_helper_poll_disable(struct drm_device *dev) 295 { 296 if (!dev->mode_config.poll_enabled) 297 return; 298 cancel_delayed_work_sync(&dev->mode_config.output_poll_work); 299 } 300 EXPORT_SYMBOL(drm_kms_helper_poll_disable); 301 302 /** 303 * drm_kms_helper_poll_enable - re-enable output polling. 304 * @dev: drm_device 305 * 306 * This function re-enables the output polling work. 307 * 308 * Drivers can call this helper from their device resume implementation. It is 309 * an error to call this when the output polling support has not yet been set 310 * up. 311 */ 312 void drm_kms_helper_poll_enable(struct drm_device *dev) 313 { 314 bool poll = false; 315 struct drm_connector *connector; 316 317 if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll) 318 return; 319 320 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 321 if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | 322 DRM_CONNECTOR_POLL_DISCONNECT)) 323 poll = true; 324 } 325 326 if (poll) 327 schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD); 328 } 329 EXPORT_SYMBOL(drm_kms_helper_poll_enable); 330 331 /** 332 * drm_kms_helper_poll_init - initialize and enable output polling 333 * @dev: drm_device 334 * 335 * This function intializes and then also enables output polling support for 336 * @dev. Drivers which do not have reliable hotplug support in hardware can use 337 * this helper infrastructure to regularly poll such connectors for changes in 338 * their connection state. 339 * 340 * Drivers can control which connectors are polled by setting the 341 * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On 342 * connectors where probing live outputs can result in visual distortion drivers 343 * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this. 344 * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are 345 * completely ignored by the polling logic. 346 * 347 * Note that a connector can be both polled and probed from the hotplug handler, 348 * in case the hotplug interrupt is known to be unreliable. 349 */ 350 void drm_kms_helper_poll_init(struct drm_device *dev) 351 { 352 INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute); 353 dev->mode_config.poll_enabled = true; 354 355 drm_kms_helper_poll_enable(dev); 356 } 357 EXPORT_SYMBOL(drm_kms_helper_poll_init); 358 359 /** 360 * drm_kms_helper_poll_fini - disable output polling and clean it up 361 * @dev: drm_device 362 */ 363 void drm_kms_helper_poll_fini(struct drm_device *dev) 364 { 365 drm_kms_helper_poll_disable(dev); 366 } 367 EXPORT_SYMBOL(drm_kms_helper_poll_fini); 368 369 /** 370 * drm_helper_hpd_irq_event - hotplug processing 371 * @dev: drm_device 372 * 373 * Drivers can use this helper function to run a detect cycle on all connectors 374 * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All 375 * other connectors are ignored, which is useful to avoid reprobing fixed 376 * panels. 377 * 378 * This helper function is useful for drivers which can't or don't track hotplug 379 * interrupts for each connector. 380 * 381 * Drivers which support hotplug interrupts for each connector individually and 382 * which have a more fine-grained detect logic should bypass this code and 383 * directly call drm_kms_helper_hotplug_event() in case the connector state 384 * changed. 385 * 386 * This function must be called from process context with no mode 387 * setting locks held. 388 * 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. 391 */ 392 bool drm_helper_hpd_irq_event(struct drm_device *dev) 393 { 394 struct drm_connector *connector; 395 enum drm_connector_status old_status; 396 bool changed = false; 397 398 if (!dev->mode_config.poll_enabled) 399 return false; 400 401 mutex_lock(&dev->mode_config.mutex); 402 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 403 404 /* Only handle HPD capable connectors. */ 405 if (!(connector->polled & DRM_CONNECTOR_POLL_HPD)) 406 continue; 407 408 old_status = connector->status; 409 410 connector->status = connector->funcs->detect(connector, false); 411 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", 412 connector->base.id, 413 drm_get_connector_name(connector), 414 drm_get_connector_status_name(old_status), 415 drm_get_connector_status_name(connector->status)); 416 if (old_status != connector->status) 417 changed = true; 418 } 419 420 mutex_unlock(&dev->mode_config.mutex); 421 422 if (changed) 423 drm_kms_helper_hotplug_event(dev); 424 425 return changed; 426 } 427 EXPORT_SYMBOL(drm_helper_hpd_irq_event); 428