Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 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 | /** |
| 86 | * drm_helper_probe_single_connector_modes - get complete set of display modes |
| 87 | * @connector: connector to probe |
| 88 | * @maxX: max width for modes |
| 89 | * @maxY: max height for modes |
| 90 | * |
| 91 | * Based on the helper callbacks implemented by @connector try to detect all |
| 92 | * valid modes. Modes will first be added to the connector's probed_modes list, |
| 93 | * then culled (based on validity and the @maxX, @maxY parameters) and put into |
| 94 | * the normal modes list. |
| 95 | * |
| 96 | * Intended to be use as a generic implementation of the ->fill_modes() |
| 97 | * @connector vfunc for drivers that use the crtc helpers for output mode |
| 98 | * filtering and detection. |
| 99 | * |
| 100 | * Returns: |
| 101 | * The number of modes found on @connector. |
| 102 | */ |
| 103 | int drm_helper_probe_single_connector_modes(struct drm_connector *connector, |
| 104 | uint32_t maxX, uint32_t maxY) |
| 105 | { |
| 106 | struct drm_device *dev = connector->dev; |
| 107 | struct drm_display_mode *mode; |
| 108 | struct drm_connector_helper_funcs *connector_funcs = |
| 109 | connector->helper_private; |
| 110 | int count = 0; |
| 111 | int mode_flags = 0; |
| 112 | bool verbose_prune = true; |
| 113 | |
| 114 | WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); |
| 115 | |
| 116 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, |
| 117 | drm_get_connector_name(connector)); |
| 118 | /* set all modes to the unverified state */ |
| 119 | list_for_each_entry(mode, &connector->modes, head) |
| 120 | mode->status = MODE_UNVERIFIED; |
| 121 | |
| 122 | if (connector->force) { |
| 123 | if (connector->force == DRM_FORCE_ON) |
| 124 | connector->status = connector_status_connected; |
| 125 | else |
| 126 | connector->status = connector_status_disconnected; |
| 127 | if (connector->funcs->force) |
| 128 | connector->funcs->force(connector); |
| 129 | } else { |
| 130 | connector->status = connector->funcs->detect(connector, true); |
| 131 | } |
| 132 | |
| 133 | /* Re-enable polling in case the global poll config changed. */ |
| 134 | if (drm_kms_helper_poll != dev->mode_config.poll_running) |
| 135 | drm_kms_helper_poll_enable(dev); |
| 136 | |
| 137 | dev->mode_config.poll_running = drm_kms_helper_poll; |
| 138 | |
| 139 | if (connector->status == connector_status_disconnected) { |
| 140 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n", |
| 141 | connector->base.id, drm_get_connector_name(connector)); |
| 142 | drm_mode_connector_update_edid_property(connector, NULL); |
| 143 | verbose_prune = false; |
| 144 | goto prune; |
| 145 | } |
| 146 | |
| 147 | #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE |
| 148 | count = drm_load_edid_firmware(connector); |
| 149 | if (count == 0) |
| 150 | #endif |
| 151 | count = (*connector_funcs->get_modes)(connector); |
| 152 | |
| 153 | if (count == 0 && connector->status == connector_status_connected) |
| 154 | count = drm_add_modes_noedid(connector, 1024, 768); |
| 155 | if (count == 0) |
| 156 | goto prune; |
| 157 | |
| 158 | drm_mode_connector_list_update(connector); |
| 159 | |
| 160 | if (maxX && maxY) |
| 161 | drm_mode_validate_size(dev, &connector->modes, maxX, maxY); |
| 162 | |
| 163 | if (connector->interlace_allowed) |
| 164 | mode_flags |= DRM_MODE_FLAG_INTERLACE; |
| 165 | if (connector->doublescan_allowed) |
| 166 | mode_flags |= DRM_MODE_FLAG_DBLSCAN; |
| 167 | if (connector->stereo_allowed) |
| 168 | mode_flags |= DRM_MODE_FLAG_3D_MASK; |
| 169 | drm_mode_validate_flag(connector, mode_flags); |
| 170 | |
| 171 | list_for_each_entry(mode, &connector->modes, head) { |
| 172 | if (mode->status == MODE_OK) |
| 173 | mode->status = connector_funcs->mode_valid(connector, |
| 174 | mode); |
| 175 | } |
| 176 | |
| 177 | prune: |
| 178 | drm_mode_prune_invalid(dev, &connector->modes, verbose_prune); |
| 179 | |
| 180 | if (list_empty(&connector->modes)) |
| 181 | return 0; |
| 182 | |
| 183 | list_for_each_entry(mode, &connector->modes, head) |
| 184 | mode->vrefresh = drm_mode_vrefresh(mode); |
| 185 | |
| 186 | drm_mode_sort(&connector->modes); |
| 187 | |
| 188 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id, |
| 189 | drm_get_connector_name(connector)); |
| 190 | list_for_each_entry(mode, &connector->modes, head) { |
| 191 | drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V); |
| 192 | drm_mode_debug_printmodeline(mode); |
| 193 | } |
| 194 | |
| 195 | return count; |
| 196 | } |
| 197 | EXPORT_SYMBOL(drm_helper_probe_single_connector_modes); |
| 198 | |
| 199 | /** |
| 200 | * drm_kms_helper_hotplug_event - fire off KMS hotplug events |
| 201 | * @dev: drm_device whose connector state changed |
| 202 | * |
| 203 | * This function fires off the uevent for userspace and also calls the |
| 204 | * output_poll_changed function, which is most commonly used to inform the fbdev |
| 205 | * emulation code and allow it to update the fbcon output configuration. |
| 206 | * |
| 207 | * Drivers should call this from their hotplug handling code when a change is |
| 208 | * detected. Note that this function does not do any output detection of its |
| 209 | * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the |
| 210 | * driver already. |
| 211 | * |
| 212 | * This function must be called from process context with no mode |
| 213 | * setting locks held. |
| 214 | */ |
| 215 | void drm_kms_helper_hotplug_event(struct drm_device *dev) |
| 216 | { |
| 217 | /* send a uevent + call fbdev */ |
| 218 | drm_sysfs_hotplug_event(dev); |
| 219 | if (dev->mode_config.funcs->output_poll_changed) |
| 220 | dev->mode_config.funcs->output_poll_changed(dev); |
| 221 | } |
| 222 | EXPORT_SYMBOL(drm_kms_helper_hotplug_event); |
| 223 | |
| 224 | #define DRM_OUTPUT_POLL_PERIOD (10*HZ) |
| 225 | static void output_poll_execute(struct work_struct *work) |
| 226 | { |
| 227 | struct delayed_work *delayed_work = to_delayed_work(work); |
| 228 | struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work); |
| 229 | struct drm_connector *connector; |
| 230 | enum drm_connector_status old_status; |
| 231 | bool repoll = false, changed = false; |
| 232 | |
| 233 | if (!drm_kms_helper_poll) |
| 234 | return; |
| 235 | |
| 236 | mutex_lock(&dev->mode_config.mutex); |
| 237 | list_for_each_entry(connector, &dev->mode_config.connector_list, head) { |
| 238 | |
| 239 | /* Ignore forced connectors. */ |
| 240 | if (connector->force) |
| 241 | continue; |
| 242 | |
| 243 | /* Ignore HPD capable connectors and connectors where we don't |
| 244 | * want any hotplug detection at all for polling. */ |
| 245 | if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD) |
| 246 | continue; |
| 247 | |
| 248 | repoll = true; |
| 249 | |
| 250 | old_status = connector->status; |
| 251 | /* if we are connected and don't want to poll for disconnect |
| 252 | skip it */ |
| 253 | if (old_status == connector_status_connected && |
| 254 | !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT)) |
| 255 | continue; |
| 256 | |
| 257 | connector->status = connector->funcs->detect(connector, false); |
| 258 | if (old_status != connector->status) { |
| 259 | const char *old, *new; |
| 260 | |
| 261 | old = drm_get_connector_status_name(old_status); |
| 262 | new = drm_get_connector_status_name(connector->status); |
| 263 | |
| 264 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] " |
| 265 | "status updated from %s to %s\n", |
| 266 | connector->base.id, |
| 267 | drm_get_connector_name(connector), |
| 268 | old, new); |
| 269 | |
| 270 | changed = true; |
| 271 | } |
| 272 | } |
| 273 | |
| 274 | mutex_unlock(&dev->mode_config.mutex); |
| 275 | |
| 276 | if (changed) |
| 277 | drm_kms_helper_hotplug_event(dev); |
| 278 | |
| 279 | if (repoll) |
| 280 | schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD); |
| 281 | } |
| 282 | |
| 283 | /** |
| 284 | * drm_kms_helper_poll_disable - disable output polling |
| 285 | * @dev: drm_device |
| 286 | * |
| 287 | * This function disables the output polling work. |
| 288 | * |
| 289 | * Drivers can call this helper from their device suspend implementation. It is |
| 290 | * not an error to call this even when output polling isn't enabled or arlready |
| 291 | * disabled. |
| 292 | */ |
| 293 | void drm_kms_helper_poll_disable(struct drm_device *dev) |
| 294 | { |
| 295 | if (!dev->mode_config.poll_enabled) |
| 296 | return; |
| 297 | cancel_delayed_work_sync(&dev->mode_config.output_poll_work); |
| 298 | } |
| 299 | EXPORT_SYMBOL(drm_kms_helper_poll_disable); |
| 300 | |
| 301 | /** |
| 302 | * drm_kms_helper_poll_enable - re-enable output polling. |
| 303 | * @dev: drm_device |
| 304 | * |
| 305 | * This function re-enables the output polling work. |
| 306 | * |
| 307 | * Drivers can call this helper from their device resume implementation. It is |
| 308 | * an error to call this when the output polling support has not yet been set |
| 309 | * up. |
| 310 | */ |
| 311 | void drm_kms_helper_poll_enable(struct drm_device *dev) |
| 312 | { |
| 313 | bool poll = false; |
| 314 | struct drm_connector *connector; |
| 315 | |
| 316 | if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll) |
| 317 | return; |
| 318 | |
| 319 | list_for_each_entry(connector, &dev->mode_config.connector_list, head) { |
| 320 | if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | |
| 321 | DRM_CONNECTOR_POLL_DISCONNECT)) |
| 322 | poll = true; |
| 323 | } |
| 324 | |
| 325 | if (poll) |
| 326 | schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD); |
| 327 | } |
| 328 | EXPORT_SYMBOL(drm_kms_helper_poll_enable); |
| 329 | |
| 330 | /** |
| 331 | * drm_kms_helper_poll_init - initialize and enable output polling |
| 332 | * @dev: drm_device |
| 333 | * |
| 334 | * This function intializes and then also enables output polling support for |
| 335 | * @dev. Drivers which do not have reliable hotplug support in hardware can use |
| 336 | * this helper infrastructure to regularly poll such connectors for changes in |
| 337 | * their connection state. |
| 338 | * |
| 339 | * Drivers can control which connectors are polled by setting the |
| 340 | * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On |
| 341 | * connectors where probing live outputs can result in visual distortion drivers |
| 342 | * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this. |
| 343 | * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are |
| 344 | * completely ignored by the polling logic. |
| 345 | * |
| 346 | * Note that a connector can be both polled and probed from the hotplug handler, |
| 347 | * in case the hotplug interrupt is known to be unreliable. |
| 348 | */ |
| 349 | void drm_kms_helper_poll_init(struct drm_device *dev) |
| 350 | { |
| 351 | INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute); |
| 352 | dev->mode_config.poll_enabled = true; |
| 353 | |
| 354 | drm_kms_helper_poll_enable(dev); |
| 355 | } |
| 356 | EXPORT_SYMBOL(drm_kms_helper_poll_init); |
| 357 | |
| 358 | /** |
| 359 | * drm_kms_helper_poll_fini - disable output polling and clean it up |
| 360 | * @dev: drm_device |
| 361 | */ |
| 362 | void drm_kms_helper_poll_fini(struct drm_device *dev) |
| 363 | { |
| 364 | drm_kms_helper_poll_disable(dev); |
| 365 | } |
| 366 | EXPORT_SYMBOL(drm_kms_helper_poll_fini); |
| 367 | |
| 368 | /** |
| 369 | * drm_helper_hpd_irq_event - hotplug processing |
| 370 | * @dev: drm_device |
| 371 | * |
| 372 | * Drivers can use this helper function to run a detect cycle on all connectors |
| 373 | * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All |
| 374 | * other connectors are ignored, which is useful to avoid reprobing fixed |
| 375 | * panels. |
| 376 | * |
| 377 | * This helper function is useful for drivers which can't or don't track hotplug |
| 378 | * interrupts for each connector. |
| 379 | * |
| 380 | * Drivers which support hotplug interrupts for each connector individually and |
| 381 | * which have a more fine-grained detect logic should bypass this code and |
| 382 | * directly call drm_kms_helper_hotplug_event() in case the connector state |
| 383 | * changed. |
| 384 | * |
| 385 | * This function must be called from process context with no mode |
| 386 | * setting locks held. |
| 387 | * |
| 388 | * Note that a connector can be both polled and probed from the hotplug handler, |
| 389 | * in case the hotplug interrupt is known to be unreliable. |
| 390 | */ |
| 391 | bool drm_helper_hpd_irq_event(struct drm_device *dev) |
| 392 | { |
| 393 | struct drm_connector *connector; |
| 394 | enum drm_connector_status old_status; |
| 395 | bool changed = false; |
| 396 | |
| 397 | if (!dev->mode_config.poll_enabled) |
| 398 | return false; |
| 399 | |
| 400 | mutex_lock(&dev->mode_config.mutex); |
| 401 | list_for_each_entry(connector, &dev->mode_config.connector_list, head) { |
| 402 | |
| 403 | /* Only handle HPD capable connectors. */ |
| 404 | if (!(connector->polled & DRM_CONNECTOR_POLL_HPD)) |
| 405 | continue; |
| 406 | |
| 407 | old_status = connector->status; |
| 408 | |
| 409 | connector->status = connector->funcs->detect(connector, false); |
| 410 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", |
| 411 | connector->base.id, |
| 412 | drm_get_connector_name(connector), |
| 413 | drm_get_connector_status_name(old_status), |
| 414 | drm_get_connector_status_name(connector->status)); |
| 415 | if (old_status != connector->status) |
| 416 | changed = true; |
| 417 | } |
| 418 | |
| 419 | mutex_unlock(&dev->mode_config.mutex); |
| 420 | |
| 421 | if (changed) |
| 422 | drm_kms_helper_hotplug_event(dev); |
| 423 | |
| 424 | return changed; |
| 425 | } |
| 426 | EXPORT_SYMBOL(drm_helper_hpd_irq_event); |