1 /* 2 * Copyright © 2015 Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 21 * IN THE SOFTWARE. 22 */ 23 24 #include <linux/kernel.h> 25 26 #include <drm/drmP.h> 27 #include <drm/i915_drm.h> 28 29 #include "i915_drv.h" 30 #include "intel_drv.h" 31 32 /** 33 * DOC: Hotplug 34 * 35 * Simply put, hotplug occurs when a display is connected to or disconnected 36 * from the system. However, there may be adapters and docking stations and 37 * Display Port short pulses and MST devices involved, complicating matters. 38 * 39 * Hotplug in i915 is handled in many different levels of abstraction. 40 * 41 * The platform dependent interrupt handling code in i915_irq.c enables, 42 * disables, and does preliminary handling of the interrupts. The interrupt 43 * handlers gather the hotplug detect (HPD) information from relevant registers 44 * into a platform independent mask of hotplug pins that have fired. 45 * 46 * The platform independent interrupt handler intel_hpd_irq_handler() in 47 * intel_hotplug.c does hotplug irq storm detection and mitigation, and passes 48 * further processing to appropriate bottom halves (Display Port specific and 49 * regular hotplug). 50 * 51 * The Display Port work function i915_digport_work_func() calls into 52 * intel_dp_hpd_pulse() via hooks, which handles DP short pulses and DP MST long 53 * pulses, with failures and non-MST long pulses triggering regular hotplug 54 * processing on the connector. 55 * 56 * The regular hotplug work function i915_hotplug_work_func() calls connector 57 * detect hooks, and, if connector status changes, triggers sending of hotplug 58 * uevent to userspace via drm_kms_helper_hotplug_event(). 59 * 60 * Finally, the userspace is responsible for triggering a modeset upon receiving 61 * the hotplug uevent, disabling or enabling the crtc as needed. 62 * 63 * The hotplug interrupt storm detection and mitigation code keeps track of the 64 * number of interrupts per hotplug pin per a period of time, and if the number 65 * of interrupts exceeds a certain threshold, the interrupt is disabled for a 66 * while before being re-enabled. The intention is to mitigate issues raising 67 * from broken hardware triggering massive amounts of interrupts and grinding 68 * the system to a halt. 69 * 70 * Current implementation expects that hotplug interrupt storm will not be 71 * seen when display port sink is connected, hence on platforms whose DP 72 * callback is handled by i915_digport_work_func reenabling of hpd is not 73 * performed (it was never expected to be disabled in the first place ;) ) 74 * this is specific to DP sinks handled by this routine and any other display 75 * such as HDMI or DVI enabled on the same port will have proper logic since 76 * it will use i915_hotplug_work_func where this logic is handled. 77 */ 78 79 /** 80 * intel_hpd_port - return port hard associated with certain pin. 81 * @pin: the hpd pin to get associated port 82 * 83 * Return port that is associatade with @pin and PORT_NONE if no port is 84 * hard associated with that @pin. 85 */ 86 enum port intel_hpd_pin_to_port(enum hpd_pin pin) 87 { 88 switch (pin) { 89 case HPD_PORT_A: 90 return PORT_A; 91 case HPD_PORT_B: 92 return PORT_B; 93 case HPD_PORT_C: 94 return PORT_C; 95 case HPD_PORT_D: 96 return PORT_D; 97 case HPD_PORT_E: 98 return PORT_E; 99 default: 100 return PORT_NONE; /* no port for this pin */ 101 } 102 } 103 104 /** 105 * intel_hpd_pin - return pin hard associated with certain port. 106 * @port: the hpd port to get associated pin 107 * 108 * Return pin that is associatade with @port and HDP_NONE if no pin is 109 * hard associated with that @port. 110 */ 111 enum hpd_pin intel_hpd_pin(enum port port) 112 { 113 switch (port) { 114 case PORT_A: 115 return HPD_PORT_A; 116 case PORT_B: 117 return HPD_PORT_B; 118 case PORT_C: 119 return HPD_PORT_C; 120 case PORT_D: 121 return HPD_PORT_D; 122 case PORT_E: 123 return HPD_PORT_E; 124 default: 125 MISSING_CASE(port); 126 return HPD_NONE; 127 } 128 } 129 130 #define HPD_STORM_DETECT_PERIOD 1000 131 #define HPD_STORM_REENABLE_DELAY (2 * 60 * 1000) 132 133 /** 134 * intel_hpd_irq_storm_detect - gather stats and detect HPD irq storm on a pin 135 * @dev_priv: private driver data pointer 136 * @pin: the pin to gather stats on 137 * 138 * Gather stats about HPD irqs from the specified @pin, and detect irq 139 * storms. Only the pin specific stats and state are changed, the caller is 140 * responsible for further action. 141 * 142 * The number of irqs that are allowed within @HPD_STORM_DETECT_PERIOD is 143 * stored in @dev_priv->hotplug.hpd_storm_threshold which defaults to 144 * @HPD_STORM_DEFAULT_THRESHOLD. If this threshold is exceeded, it's 145 * considered an irq storm and the irq state is set to @HPD_MARK_DISABLED. 146 * 147 * The HPD threshold can be controlled through i915_hpd_storm_ctl in debugfs, 148 * and should only be adjusted for automated hotplug testing. 149 * 150 * Return true if an irq storm was detected on @pin. 151 */ 152 static bool intel_hpd_irq_storm_detect(struct drm_i915_private *dev_priv, 153 enum hpd_pin pin) 154 { 155 unsigned long start = dev_priv->hotplug.stats[pin].last_jiffies; 156 unsigned long end = start + msecs_to_jiffies(HPD_STORM_DETECT_PERIOD); 157 const int threshold = dev_priv->hotplug.hpd_storm_threshold; 158 bool storm = false; 159 160 if (!time_in_range(jiffies, start, end)) { 161 dev_priv->hotplug.stats[pin].last_jiffies = jiffies; 162 dev_priv->hotplug.stats[pin].count = 0; 163 DRM_DEBUG_KMS("Received HPD interrupt on PIN %d - cnt: 0\n", pin); 164 } else if (dev_priv->hotplug.stats[pin].count > threshold && 165 threshold) { 166 dev_priv->hotplug.stats[pin].state = HPD_MARK_DISABLED; 167 DRM_DEBUG_KMS("HPD interrupt storm detected on PIN %d\n", pin); 168 storm = true; 169 } else { 170 dev_priv->hotplug.stats[pin].count++; 171 DRM_DEBUG_KMS("Received HPD interrupt on PIN %d - cnt: %d\n", pin, 172 dev_priv->hotplug.stats[pin].count); 173 } 174 175 return storm; 176 } 177 178 static void intel_hpd_irq_storm_disable(struct drm_i915_private *dev_priv) 179 { 180 struct drm_device *dev = &dev_priv->drm; 181 struct intel_connector *intel_connector; 182 struct intel_encoder *intel_encoder; 183 struct drm_connector *connector; 184 struct drm_connector_list_iter conn_iter; 185 enum hpd_pin pin; 186 bool hpd_disabled = false; 187 188 lockdep_assert_held(&dev_priv->irq_lock); 189 190 drm_connector_list_iter_begin(dev, &conn_iter); 191 drm_for_each_connector_iter(connector, &conn_iter) { 192 if (connector->polled != DRM_CONNECTOR_POLL_HPD) 193 continue; 194 195 intel_connector = to_intel_connector(connector); 196 intel_encoder = intel_connector->encoder; 197 if (!intel_encoder) 198 continue; 199 200 pin = intel_encoder->hpd_pin; 201 if (pin == HPD_NONE || 202 dev_priv->hotplug.stats[pin].state != HPD_MARK_DISABLED) 203 continue; 204 205 DRM_INFO("HPD interrupt storm detected on connector %s: " 206 "switching from hotplug detection to polling\n", 207 connector->name); 208 209 dev_priv->hotplug.stats[pin].state = HPD_DISABLED; 210 connector->polled = DRM_CONNECTOR_POLL_CONNECT 211 | DRM_CONNECTOR_POLL_DISCONNECT; 212 hpd_disabled = true; 213 } 214 drm_connector_list_iter_end(&conn_iter); 215 216 /* Enable polling and queue hotplug re-enabling. */ 217 if (hpd_disabled) { 218 drm_kms_helper_poll_enable(dev); 219 mod_delayed_work(system_wq, &dev_priv->hotplug.reenable_work, 220 msecs_to_jiffies(HPD_STORM_REENABLE_DELAY)); 221 } 222 } 223 224 static void intel_hpd_irq_storm_reenable_work(struct work_struct *work) 225 { 226 struct drm_i915_private *dev_priv = 227 container_of(work, typeof(*dev_priv), 228 hotplug.reenable_work.work); 229 struct drm_device *dev = &dev_priv->drm; 230 int i; 231 232 intel_runtime_pm_get(dev_priv); 233 234 spin_lock_irq(&dev_priv->irq_lock); 235 for_each_hpd_pin(i) { 236 struct drm_connector *connector; 237 struct drm_connector_list_iter conn_iter; 238 239 if (dev_priv->hotplug.stats[i].state != HPD_DISABLED) 240 continue; 241 242 dev_priv->hotplug.stats[i].state = HPD_ENABLED; 243 244 drm_connector_list_iter_begin(dev, &conn_iter); 245 drm_for_each_connector_iter(connector, &conn_iter) { 246 struct intel_connector *intel_connector = to_intel_connector(connector); 247 248 if (intel_connector->encoder->hpd_pin == i) { 249 if (connector->polled != intel_connector->polled) 250 DRM_DEBUG_DRIVER("Reenabling HPD on connector %s\n", 251 connector->name); 252 connector->polled = intel_connector->polled; 253 if (!connector->polled) 254 connector->polled = DRM_CONNECTOR_POLL_HPD; 255 } 256 } 257 drm_connector_list_iter_end(&conn_iter); 258 } 259 if (dev_priv->display_irqs_enabled && dev_priv->display.hpd_irq_setup) 260 dev_priv->display.hpd_irq_setup(dev_priv); 261 spin_unlock_irq(&dev_priv->irq_lock); 262 263 intel_runtime_pm_put(dev_priv); 264 } 265 266 static bool intel_hpd_irq_event(struct drm_device *dev, 267 struct drm_connector *connector) 268 { 269 enum drm_connector_status old_status; 270 271 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); 272 old_status = connector->status; 273 274 connector->status = drm_helper_probe_detect(connector, NULL, false); 275 276 if (old_status == connector->status) 277 return false; 278 279 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", 280 connector->base.id, 281 connector->name, 282 drm_get_connector_status_name(old_status), 283 drm_get_connector_status_name(connector->status)); 284 285 return true; 286 } 287 288 static void i915_digport_work_func(struct work_struct *work) 289 { 290 struct drm_i915_private *dev_priv = 291 container_of(work, struct drm_i915_private, hotplug.dig_port_work); 292 u32 long_port_mask, short_port_mask; 293 struct intel_digital_port *intel_dig_port; 294 int i; 295 u32 old_bits = 0; 296 297 spin_lock_irq(&dev_priv->irq_lock); 298 long_port_mask = dev_priv->hotplug.long_port_mask; 299 dev_priv->hotplug.long_port_mask = 0; 300 short_port_mask = dev_priv->hotplug.short_port_mask; 301 dev_priv->hotplug.short_port_mask = 0; 302 spin_unlock_irq(&dev_priv->irq_lock); 303 304 for (i = 0; i < I915_MAX_PORTS; i++) { 305 bool valid = false; 306 bool long_hpd = false; 307 intel_dig_port = dev_priv->hotplug.irq_port[i]; 308 if (!intel_dig_port || !intel_dig_port->hpd_pulse) 309 continue; 310 311 if (long_port_mask & (1 << i)) { 312 valid = true; 313 long_hpd = true; 314 } else if (short_port_mask & (1 << i)) 315 valid = true; 316 317 if (valid) { 318 enum irqreturn ret; 319 320 ret = intel_dig_port->hpd_pulse(intel_dig_port, long_hpd); 321 if (ret == IRQ_NONE) { 322 /* fall back to old school hpd */ 323 old_bits |= (1 << intel_dig_port->base.hpd_pin); 324 } 325 } 326 } 327 328 if (old_bits) { 329 spin_lock_irq(&dev_priv->irq_lock); 330 dev_priv->hotplug.event_bits |= old_bits; 331 spin_unlock_irq(&dev_priv->irq_lock); 332 schedule_work(&dev_priv->hotplug.hotplug_work); 333 } 334 } 335 336 /* 337 * Handle hotplug events outside the interrupt handler proper. 338 */ 339 static void i915_hotplug_work_func(struct work_struct *work) 340 { 341 struct drm_i915_private *dev_priv = 342 container_of(work, struct drm_i915_private, hotplug.hotplug_work); 343 struct drm_device *dev = &dev_priv->drm; 344 struct intel_connector *intel_connector; 345 struct intel_encoder *intel_encoder; 346 struct drm_connector *connector; 347 struct drm_connector_list_iter conn_iter; 348 bool changed = false; 349 u32 hpd_event_bits; 350 351 mutex_lock(&dev->mode_config.mutex); 352 DRM_DEBUG_KMS("running encoder hotplug functions\n"); 353 354 spin_lock_irq(&dev_priv->irq_lock); 355 356 hpd_event_bits = dev_priv->hotplug.event_bits; 357 dev_priv->hotplug.event_bits = 0; 358 359 /* Disable hotplug on connectors that hit an irq storm. */ 360 intel_hpd_irq_storm_disable(dev_priv); 361 362 spin_unlock_irq(&dev_priv->irq_lock); 363 364 drm_connector_list_iter_begin(dev, &conn_iter); 365 drm_for_each_connector_iter(connector, &conn_iter) { 366 intel_connector = to_intel_connector(connector); 367 if (!intel_connector->encoder) 368 continue; 369 intel_encoder = intel_connector->encoder; 370 if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) { 371 DRM_DEBUG_KMS("Connector %s (pin %i) received hotplug event.\n", 372 connector->name, intel_encoder->hpd_pin); 373 if (intel_encoder->hot_plug) 374 intel_encoder->hot_plug(intel_encoder); 375 if (intel_hpd_irq_event(dev, connector)) 376 changed = true; 377 } 378 } 379 drm_connector_list_iter_end(&conn_iter); 380 mutex_unlock(&dev->mode_config.mutex); 381 382 if (changed) 383 drm_kms_helper_hotplug_event(dev); 384 } 385 386 387 /** 388 * intel_hpd_irq_handler - main hotplug irq handler 389 * @dev_priv: drm_i915_private 390 * @pin_mask: a mask of hpd pins that have triggered the irq 391 * @long_mask: a mask of hpd pins that may be long hpd pulses 392 * 393 * This is the main hotplug irq handler for all platforms. The platform specific 394 * irq handlers call the platform specific hotplug irq handlers, which read and 395 * decode the appropriate registers into bitmasks about hpd pins that have 396 * triggered (@pin_mask), and which of those pins may be long pulses 397 * (@long_mask). The @long_mask is ignored if the port corresponding to the pin 398 * is not a digital port. 399 * 400 * Here, we do hotplug irq storm detection and mitigation, and pass further 401 * processing to appropriate bottom halves. 402 */ 403 void intel_hpd_irq_handler(struct drm_i915_private *dev_priv, 404 u32 pin_mask, u32 long_mask) 405 { 406 int i; 407 enum port port; 408 bool storm_detected = false; 409 bool queue_dig = false, queue_hp = false; 410 bool is_dig_port; 411 412 if (!pin_mask) 413 return; 414 415 lockmgr(&dev_priv->irq_lock, LK_EXCLUSIVE); 416 for_each_hpd_pin(i) { 417 if (!(BIT(i) & pin_mask)) 418 continue; 419 420 port = intel_hpd_pin_to_port(i); 421 is_dig_port = port != PORT_NONE && 422 dev_priv->hotplug.irq_port[port]; 423 424 if (is_dig_port) { 425 bool long_hpd = long_mask & BIT(i); 426 427 DRM_DEBUG_DRIVER("digital hpd port %c - %s\n", port_name(port), 428 long_hpd ? "long" : "short"); 429 /* 430 * For long HPD pulses we want to have the digital queue happen, 431 * but we still want HPD storm detection to function. 432 */ 433 queue_dig = true; 434 if (long_hpd) { 435 dev_priv->hotplug.long_port_mask |= (1 << port); 436 } else { 437 /* for short HPD just trigger the digital queue */ 438 dev_priv->hotplug.short_port_mask |= (1 << port); 439 continue; 440 } 441 } 442 443 if (dev_priv->hotplug.stats[i].state == HPD_DISABLED) { 444 /* 445 * On GMCH platforms the interrupt mask bits only 446 * prevent irq generation, not the setting of the 447 * hotplug bits itself. So only WARN about unexpected 448 * interrupts on saner platforms. 449 */ 450 WARN_ONCE(!HAS_GMCH_DISPLAY(dev_priv), 451 "Received HPD interrupt on pin %d although disabled\n", i); 452 continue; 453 } 454 455 if (dev_priv->hotplug.stats[i].state != HPD_ENABLED) 456 continue; 457 458 if (!is_dig_port) { 459 dev_priv->hotplug.event_bits |= BIT(i); 460 queue_hp = true; 461 } 462 463 if (intel_hpd_irq_storm_detect(dev_priv, i)) { 464 dev_priv->hotplug.event_bits &= ~BIT(i); 465 storm_detected = true; 466 } 467 } 468 469 if (storm_detected && dev_priv->display_irqs_enabled) 470 dev_priv->display.hpd_irq_setup(dev_priv); 471 lockmgr(&dev_priv->irq_lock, LK_RELEASE); 472 473 /* 474 * Our hotplug handler can grab modeset locks (by calling down into the 475 * fb helpers). Hence it must not be run on our own dev-priv->wq work 476 * queue for otherwise the flush_work in the pageflip code will 477 * deadlock. 478 */ 479 if (queue_dig) 480 queue_work(dev_priv->hotplug.dp_wq, &dev_priv->hotplug.dig_port_work); 481 if (queue_hp) 482 schedule_work(&dev_priv->hotplug.hotplug_work); 483 } 484 485 /** 486 * intel_hpd_init - initializes and enables hpd support 487 * @dev_priv: i915 device instance 488 * 489 * This function enables the hotplug support. It requires that interrupts have 490 * already been enabled with intel_irq_init_hw(). From this point on hotplug and 491 * poll request can run concurrently to other code, so locking rules must be 492 * obeyed. 493 * 494 * This is a separate step from interrupt enabling to simplify the locking rules 495 * in the driver load and resume code. 496 * 497 * Also see: intel_hpd_poll_init(), which enables connector polling 498 */ 499 void intel_hpd_init(struct drm_i915_private *dev_priv) 500 { 501 int i; 502 503 for_each_hpd_pin(i) { 504 dev_priv->hotplug.stats[i].count = 0; 505 dev_priv->hotplug.stats[i].state = HPD_ENABLED; 506 } 507 508 WRITE_ONCE(dev_priv->hotplug.poll_enabled, false); 509 schedule_work(&dev_priv->hotplug.poll_init_work); 510 511 /* 512 * Interrupt setup is already guaranteed to be single-threaded, this is 513 * just to make the assert_spin_locked checks happy. 514 */ 515 if (dev_priv->display_irqs_enabled && dev_priv->display.hpd_irq_setup) { 516 spin_lock_irq(&dev_priv->irq_lock); 517 if (dev_priv->display_irqs_enabled) 518 dev_priv->display.hpd_irq_setup(dev_priv); 519 spin_unlock_irq(&dev_priv->irq_lock); 520 } 521 } 522 523 static void i915_hpd_poll_init_work(struct work_struct *work) 524 { 525 struct drm_i915_private *dev_priv = 526 container_of(work, struct drm_i915_private, 527 hotplug.poll_init_work); 528 struct drm_device *dev = &dev_priv->drm; 529 struct drm_connector *connector; 530 struct drm_connector_list_iter conn_iter; 531 bool enabled; 532 533 mutex_lock(&dev->mode_config.mutex); 534 535 enabled = READ_ONCE(dev_priv->hotplug.poll_enabled); 536 537 drm_connector_list_iter_begin(dev, &conn_iter); 538 drm_for_each_connector_iter(connector, &conn_iter) { 539 struct intel_connector *intel_connector = 540 to_intel_connector(connector); 541 connector->polled = intel_connector->polled; 542 543 /* MST has a dynamic intel_connector->encoder and it's reprobing 544 * is all handled by the MST helpers. */ 545 if (intel_connector->mst_port) 546 continue; 547 548 if (!connector->polled && I915_HAS_HOTPLUG(dev_priv) && 549 intel_connector->encoder->hpd_pin > HPD_NONE) { 550 connector->polled = enabled ? 551 DRM_CONNECTOR_POLL_CONNECT | 552 DRM_CONNECTOR_POLL_DISCONNECT : 553 DRM_CONNECTOR_POLL_HPD; 554 } 555 } 556 drm_connector_list_iter_end(&conn_iter); 557 558 if (enabled) 559 drm_kms_helper_poll_enable(dev); 560 561 mutex_unlock(&dev->mode_config.mutex); 562 563 /* 564 * We might have missed any hotplugs that happened while we were 565 * in the middle of disabling polling 566 */ 567 if (!enabled) 568 drm_helper_hpd_irq_event(dev); 569 } 570 571 /** 572 * intel_hpd_poll_init - enables/disables polling for connectors with hpd 573 * @dev_priv: i915 device instance 574 * 575 * This function enables polling for all connectors, regardless of whether or 576 * not they support hotplug detection. Under certain conditions HPD may not be 577 * functional. On most Intel GPUs, this happens when we enter runtime suspend. 578 * On Valleyview and Cherryview systems, this also happens when we shut off all 579 * of the powerwells. 580 * 581 * Since this function can get called in contexts where we're already holding 582 * dev->mode_config.mutex, we do the actual hotplug enabling in a seperate 583 * worker. 584 * 585 * Also see: intel_hpd_init(), which restores hpd handling. 586 */ 587 void intel_hpd_poll_init(struct drm_i915_private *dev_priv) 588 { 589 WRITE_ONCE(dev_priv->hotplug.poll_enabled, true); 590 591 /* 592 * We might already be holding dev->mode_config.mutex, so do this in a 593 * seperate worker 594 * As well, there's no issue if we race here since we always reschedule 595 * this worker anyway 596 */ 597 schedule_work(&dev_priv->hotplug.poll_init_work); 598 } 599 600 void intel_hpd_init_work(struct drm_i915_private *dev_priv) 601 { 602 INIT_WORK(&dev_priv->hotplug.hotplug_work, i915_hotplug_work_func); 603 INIT_WORK(&dev_priv->hotplug.dig_port_work, i915_digport_work_func); 604 INIT_WORK(&dev_priv->hotplug.poll_init_work, i915_hpd_poll_init_work); 605 INIT_DELAYED_WORK(&dev_priv->hotplug.reenable_work, 606 intel_hpd_irq_storm_reenable_work); 607 } 608 609 void intel_hpd_cancel_work(struct drm_i915_private *dev_priv) 610 { 611 spin_lock_irq(&dev_priv->irq_lock); 612 613 dev_priv->hotplug.long_port_mask = 0; 614 dev_priv->hotplug.short_port_mask = 0; 615 dev_priv->hotplug.event_bits = 0; 616 617 spin_unlock_irq(&dev_priv->irq_lock); 618 619 cancel_work_sync(&dev_priv->hotplug.dig_port_work); 620 cancel_work_sync(&dev_priv->hotplug.hotplug_work); 621 cancel_work_sync(&dev_priv->hotplug.poll_init_work); 622 cancel_delayed_work_sync(&dev_priv->hotplug.reenable_work); 623 } 624 625 bool intel_hpd_disable(struct drm_i915_private *dev_priv, enum hpd_pin pin) 626 { 627 bool ret = false; 628 629 if (pin == HPD_NONE) 630 return false; 631 632 spin_lock_irq(&dev_priv->irq_lock); 633 if (dev_priv->hotplug.stats[pin].state == HPD_ENABLED) { 634 dev_priv->hotplug.stats[pin].state = HPD_DISABLED; 635 ret = true; 636 } 637 spin_unlock_irq(&dev_priv->irq_lock); 638 639 return ret; 640 } 641 642 void intel_hpd_enable(struct drm_i915_private *dev_priv, enum hpd_pin pin) 643 { 644 if (pin == HPD_NONE) 645 return; 646 647 spin_lock_irq(&dev_priv->irq_lock); 648 dev_priv->hotplug.stats[pin].state = HPD_ENABLED; 649 spin_unlock_irq(&dev_priv->irq_lock); 650 } 651