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 */
intel_hpd_pin_to_port(enum hpd_pin pin)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 */
intel_hpd_pin(enum port port)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 */
intel_hpd_irq_storm_detect(struct drm_i915_private * dev_priv,enum hpd_pin pin)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
intel_hpd_irq_storm_disable(struct drm_i915_private * dev_priv)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
intel_hpd_irq_storm_reenable_work(struct work_struct * work)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
intel_hpd_irq_event(struct drm_device * dev,struct drm_connector * connector)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
i915_digport_work_func(struct work_struct * work)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 */
i915_hotplug_work_func(struct work_struct * work)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 */
intel_hpd_irq_handler(struct drm_i915_private * dev_priv,u32 pin_mask,u32 long_mask)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 */
intel_hpd_init(struct drm_i915_private * dev_priv)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
i915_hpd_poll_init_work(struct work_struct * work)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 */
intel_hpd_poll_init(struct drm_i915_private * dev_priv)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
intel_hpd_init_work(struct drm_i915_private * dev_priv)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
intel_hpd_cancel_work(struct drm_i915_private * dev_priv)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
intel_hpd_disable(struct drm_i915_private * dev_priv,enum hpd_pin pin)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
intel_hpd_enable(struct drm_i915_private * dev_priv,enum hpd_pin pin)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