2 * Copyright © 2015 Intel Corporation
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5 * copy of this software and associated documentation files (the "Software"),
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11 * The above copyright notice and this permission notice (including the next
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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
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20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24 #include <linux/kernel.h>
27 #include "intel_display_types.h"
28 #include "intel_hotplug.h"
33 * Simply put, hotplug occurs when a display is connected to or disconnected
34 * from the system. However, there may be adapters and docking stations and
35 * Display Port short pulses and MST devices involved, complicating matters.
37 * Hotplug in i915 is handled in many different levels of abstraction.
39 * The platform dependent interrupt handling code in i915_irq.c enables,
40 * disables, and does preliminary handling of the interrupts. The interrupt
41 * handlers gather the hotplug detect (HPD) information from relevant registers
42 * into a platform independent mask of hotplug pins that have fired.
44 * The platform independent interrupt handler intel_hpd_irq_handler() in
45 * intel_hotplug.c does hotplug irq storm detection and mitigation, and passes
46 * further processing to appropriate bottom halves (Display Port specific and
49 * The Display Port work function i915_digport_work_func() calls into
50 * intel_dp_hpd_pulse() via hooks, which handles DP short pulses and DP MST long
51 * pulses, with failures and non-MST long pulses triggering regular hotplug
52 * processing on the connector.
54 * The regular hotplug work function i915_hotplug_work_func() calls connector
55 * detect hooks, and, if connector status changes, triggers sending of hotplug
56 * uevent to userspace via drm_kms_helper_hotplug_event().
58 * Finally, the userspace is responsible for triggering a modeset upon receiving
59 * the hotplug uevent, disabling or enabling the crtc as needed.
61 * The hotplug interrupt storm detection and mitigation code keeps track of the
62 * number of interrupts per hotplug pin per a period of time, and if the number
63 * of interrupts exceeds a certain threshold, the interrupt is disabled for a
64 * while before being re-enabled. The intention is to mitigate issues raising
65 * from broken hardware triggering massive amounts of interrupts and grinding
66 * the system to a halt.
68 * Current implementation expects that hotplug interrupt storm will not be
69 * seen when display port sink is connected, hence on platforms whose DP
70 * callback is handled by i915_digport_work_func reenabling of hpd is not
71 * performed (it was never expected to be disabled in the first place ;) )
72 * this is specific to DP sinks handled by this routine and any other display
73 * such as HDMI or DVI enabled on the same port will have proper logic since
74 * it will use i915_hotplug_work_func where this logic is handled.
78 * intel_hpd_pin_default - return default pin associated with certain port.
79 * @dev_priv: private driver data pointer
80 * @port: the hpd port to get associated pin
82 * It is only valid and used by digital port encoder.
84 * Return pin that is associatade with @port.
86 enum hpd_pin intel_hpd_pin_default(struct drm_i915_private *dev_priv,
89 return HPD_PORT_A + port - PORT_A;
92 #define HPD_STORM_DETECT_PERIOD 1000
93 #define HPD_STORM_REENABLE_DELAY (2 * 60 * 1000)
94 #define HPD_RETRY_DELAY 1000
97 intel_connector_hpd_pin(struct intel_connector *connector)
99 struct intel_encoder *encoder = intel_attached_encoder(connector);
102 * MST connectors get their encoder attached dynamically
103 * so need to make sure we have an encoder here. But since
104 * MST encoders have their hpd_pin set to HPD_NONE we don't
105 * have to special case them beyond that.
107 return encoder ? encoder->hpd_pin : HPD_NONE;
111 * intel_hpd_irq_storm_detect - gather stats and detect HPD IRQ storm on a pin
112 * @dev_priv: private driver data pointer
113 * @pin: the pin to gather stats on
114 * @long_hpd: whether the HPD IRQ was long or short
116 * Gather stats about HPD IRQs from the specified @pin, and detect IRQ
117 * storms. Only the pin specific stats and state are changed, the caller is
118 * responsible for further action.
120 * The number of IRQs that are allowed within @HPD_STORM_DETECT_PERIOD is
121 * stored in @dev_priv->hotplug.hpd_storm_threshold which defaults to
122 * @HPD_STORM_DEFAULT_THRESHOLD. Long IRQs count as +10 to this threshold, and
123 * short IRQs count as +1. If this threshold is exceeded, it's considered an
124 * IRQ storm and the IRQ state is set to @HPD_MARK_DISABLED.
126 * By default, most systems will only count long IRQs towards
127 * &dev_priv->hotplug.hpd_storm_threshold. However, some older systems also
128 * suffer from short IRQ storms and must also track these. Because short IRQ
129 * storms are naturally caused by sideband interactions with DP MST devices,
130 * short IRQ detection is only enabled for systems without DP MST support.
131 * Systems which are new enough to support DP MST are far less likely to
132 * suffer from IRQ storms at all, so this is fine.
134 * The HPD threshold can be controlled through i915_hpd_storm_ctl in debugfs,
135 * and should only be adjusted for automated hotplug testing.
137 * Return true if an IRQ storm was detected on @pin.
139 static bool intel_hpd_irq_storm_detect(struct drm_i915_private *dev_priv,
140 enum hpd_pin pin, bool long_hpd)
142 struct i915_hotplug *hpd = &dev_priv->hotplug;
143 unsigned long start = hpd->stats[pin].last_jiffies;
144 unsigned long end = start + msecs_to_jiffies(HPD_STORM_DETECT_PERIOD);
145 const int increment = long_hpd ? 10 : 1;
146 const int threshold = hpd->hpd_storm_threshold;
150 (!long_hpd && !dev_priv->hotplug.hpd_short_storm_enabled))
153 if (!time_in_range(jiffies, start, end)) {
154 hpd->stats[pin].last_jiffies = jiffies;
155 hpd->stats[pin].count = 0;
158 hpd->stats[pin].count += increment;
159 if (hpd->stats[pin].count > threshold) {
160 hpd->stats[pin].state = HPD_MARK_DISABLED;
161 drm_dbg_kms(&dev_priv->drm,
162 "HPD interrupt storm detected on PIN %d\n", pin);
165 drm_dbg_kms(&dev_priv->drm,
166 "Received HPD interrupt on PIN %d - cnt: %d\n",
168 hpd->stats[pin].count);
175 intel_hpd_irq_storm_switch_to_polling(struct drm_i915_private *dev_priv)
177 struct drm_device *dev = &dev_priv->drm;
178 struct drm_connector_list_iter conn_iter;
179 struct intel_connector *connector;
180 bool hpd_disabled = false;
182 lockdep_assert_held(&dev_priv->irq_lock);
184 drm_connector_list_iter_begin(dev, &conn_iter);
185 for_each_intel_connector_iter(connector, &conn_iter) {
188 if (connector->base.polled != DRM_CONNECTOR_POLL_HPD)
191 pin = intel_connector_hpd_pin(connector);
192 if (pin == HPD_NONE ||
193 dev_priv->hotplug.stats[pin].state != HPD_MARK_DISABLED)
196 drm_info(&dev_priv->drm,
197 "HPD interrupt storm detected on connector %s: "
198 "switching from hotplug detection to polling\n",
199 connector->base.name);
201 dev_priv->hotplug.stats[pin].state = HPD_DISABLED;
202 connector->base.polled = DRM_CONNECTOR_POLL_CONNECT |
203 DRM_CONNECTOR_POLL_DISCONNECT;
206 drm_connector_list_iter_end(&conn_iter);
208 /* Enable polling and queue hotplug re-enabling. */
210 drm_kms_helper_poll_enable(dev);
211 mod_delayed_work(system_wq, &dev_priv->hotplug.reenable_work,
212 msecs_to_jiffies(HPD_STORM_REENABLE_DELAY));
216 static void intel_hpd_irq_storm_reenable_work(struct work_struct *work)
218 struct drm_i915_private *dev_priv =
219 container_of(work, typeof(*dev_priv),
220 hotplug.reenable_work.work);
221 struct drm_device *dev = &dev_priv->drm;
222 struct drm_connector_list_iter conn_iter;
223 struct intel_connector *connector;
224 intel_wakeref_t wakeref;
227 wakeref = intel_runtime_pm_get(&dev_priv->runtime_pm);
229 spin_lock_irq(&dev_priv->irq_lock);
231 drm_connector_list_iter_begin(dev, &conn_iter);
232 for_each_intel_connector_iter(connector, &conn_iter) {
233 pin = intel_connector_hpd_pin(connector);
234 if (pin == HPD_NONE ||
235 dev_priv->hotplug.stats[pin].state != HPD_DISABLED)
238 if (connector->base.polled != connector->polled)
239 drm_dbg(&dev_priv->drm,
240 "Reenabling HPD on connector %s\n",
241 connector->base.name);
242 connector->base.polled = connector->polled;
244 drm_connector_list_iter_end(&conn_iter);
246 for_each_hpd_pin(pin) {
247 if (dev_priv->hotplug.stats[pin].state == HPD_DISABLED)
248 dev_priv->hotplug.stats[pin].state = HPD_ENABLED;
251 if (dev_priv->display_irqs_enabled && dev_priv->display.hpd_irq_setup)
252 dev_priv->display.hpd_irq_setup(dev_priv);
254 spin_unlock_irq(&dev_priv->irq_lock);
256 intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
259 enum intel_hotplug_state
260 intel_encoder_hotplug(struct intel_encoder *encoder,
261 struct intel_connector *connector)
263 struct drm_device *dev = connector->base.dev;
264 enum drm_connector_status old_status;
265 u64 old_epoch_counter;
268 drm_WARN_ON(dev, !mutex_is_locked(&dev->mode_config.mutex));
269 old_status = connector->base.status;
270 old_epoch_counter = connector->base.epoch_counter;
272 connector->base.status =
273 drm_helper_probe_detect(&connector->base, NULL, false);
275 if (old_epoch_counter != connector->base.epoch_counter)
279 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s (epoch counter %llu->%llu)\n",
280 connector->base.base.id,
281 connector->base.name,
282 drm_get_connector_status_name(old_status),
283 drm_get_connector_status_name(connector->base.status),
285 connector->base.epoch_counter);
286 return INTEL_HOTPLUG_CHANGED;
288 return INTEL_HOTPLUG_UNCHANGED;
291 static bool intel_encoder_has_hpd_pulse(struct intel_encoder *encoder)
293 return intel_encoder_is_dig_port(encoder) &&
294 enc_to_dig_port(encoder)->hpd_pulse != NULL;
297 static void i915_digport_work_func(struct work_struct *work)
299 struct drm_i915_private *dev_priv =
300 container_of(work, struct drm_i915_private, hotplug.dig_port_work);
301 u32 long_port_mask, short_port_mask;
302 struct intel_encoder *encoder;
305 spin_lock_irq(&dev_priv->irq_lock);
306 long_port_mask = dev_priv->hotplug.long_port_mask;
307 dev_priv->hotplug.long_port_mask = 0;
308 short_port_mask = dev_priv->hotplug.short_port_mask;
309 dev_priv->hotplug.short_port_mask = 0;
310 spin_unlock_irq(&dev_priv->irq_lock);
312 for_each_intel_encoder(&dev_priv->drm, encoder) {
313 struct intel_digital_port *dig_port;
314 enum port port = encoder->port;
315 bool long_hpd, short_hpd;
318 if (!intel_encoder_has_hpd_pulse(encoder))
321 long_hpd = long_port_mask & BIT(port);
322 short_hpd = short_port_mask & BIT(port);
324 if (!long_hpd && !short_hpd)
327 dig_port = enc_to_dig_port(encoder);
329 ret = dig_port->hpd_pulse(dig_port, long_hpd);
330 if (ret == IRQ_NONE) {
331 /* fall back to old school hpd */
332 old_bits |= BIT(encoder->hpd_pin);
337 spin_lock_irq(&dev_priv->irq_lock);
338 dev_priv->hotplug.event_bits |= old_bits;
339 spin_unlock_irq(&dev_priv->irq_lock);
340 queue_delayed_work(system_wq, &dev_priv->hotplug.hotplug_work, 0);
345 * intel_hpd_trigger_irq - trigger an hpd irq event for a port
346 * @dig_port: digital port
348 * Trigger an HPD interrupt event for the given port, emulating a short pulse
349 * generated by the sink, and schedule the dig port work to handle it.
351 void intel_hpd_trigger_irq(struct intel_digital_port *dig_port)
353 struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
355 spin_lock_irq(&i915->irq_lock);
356 i915->hotplug.short_port_mask |= BIT(dig_port->base.port);
357 spin_unlock_irq(&i915->irq_lock);
359 queue_work(i915->hotplug.dp_wq, &i915->hotplug.dig_port_work);
363 * Handle hotplug events outside the interrupt handler proper.
365 static void i915_hotplug_work_func(struct work_struct *work)
367 struct drm_i915_private *dev_priv =
368 container_of(work, struct drm_i915_private,
369 hotplug.hotplug_work.work);
370 struct drm_device *dev = &dev_priv->drm;
371 struct drm_connector_list_iter conn_iter;
372 struct intel_connector *connector;
373 u32 changed = 0, retry = 0;
377 mutex_lock(&dev->mode_config.mutex);
378 drm_dbg_kms(&dev_priv->drm, "running encoder hotplug functions\n");
380 spin_lock_irq(&dev_priv->irq_lock);
382 hpd_event_bits = dev_priv->hotplug.event_bits;
383 dev_priv->hotplug.event_bits = 0;
384 hpd_retry_bits = dev_priv->hotplug.retry_bits;
385 dev_priv->hotplug.retry_bits = 0;
387 /* Enable polling for connectors which had HPD IRQ storms */
388 intel_hpd_irq_storm_switch_to_polling(dev_priv);
390 spin_unlock_irq(&dev_priv->irq_lock);
392 drm_connector_list_iter_begin(dev, &conn_iter);
393 for_each_intel_connector_iter(connector, &conn_iter) {
397 pin = intel_connector_hpd_pin(connector);
402 if ((hpd_event_bits | hpd_retry_bits) & hpd_bit) {
403 struct intel_encoder *encoder =
404 intel_attached_encoder(connector);
406 if (hpd_event_bits & hpd_bit)
407 connector->hotplug_retries = 0;
409 connector->hotplug_retries++;
411 drm_dbg_kms(&dev_priv->drm,
412 "Connector %s (pin %i) received hotplug event. (retry %d)\n",
413 connector->base.name, pin,
414 connector->hotplug_retries);
416 switch (encoder->hotplug(encoder, connector)) {
417 case INTEL_HOTPLUG_UNCHANGED:
419 case INTEL_HOTPLUG_CHANGED:
422 case INTEL_HOTPLUG_RETRY:
428 drm_connector_list_iter_end(&conn_iter);
429 mutex_unlock(&dev->mode_config.mutex);
432 drm_kms_helper_hotplug_event(dev);
434 /* Remove shared HPD pins that have changed */
437 spin_lock_irq(&dev_priv->irq_lock);
438 dev_priv->hotplug.retry_bits |= retry;
439 spin_unlock_irq(&dev_priv->irq_lock);
441 mod_delayed_work(system_wq, &dev_priv->hotplug.hotplug_work,
442 msecs_to_jiffies(HPD_RETRY_DELAY));
448 * intel_hpd_irq_handler - main hotplug irq handler
449 * @dev_priv: drm_i915_private
450 * @pin_mask: a mask of hpd pins that have triggered the irq
451 * @long_mask: a mask of hpd pins that may be long hpd pulses
453 * This is the main hotplug irq handler for all platforms. The platform specific
454 * irq handlers call the platform specific hotplug irq handlers, which read and
455 * decode the appropriate registers into bitmasks about hpd pins that have
456 * triggered (@pin_mask), and which of those pins may be long pulses
457 * (@long_mask). The @long_mask is ignored if the port corresponding to the pin
458 * is not a digital port.
460 * Here, we do hotplug irq storm detection and mitigation, and pass further
461 * processing to appropriate bottom halves.
463 void intel_hpd_irq_handler(struct drm_i915_private *dev_priv,
464 u32 pin_mask, u32 long_mask)
466 struct intel_encoder *encoder;
467 bool storm_detected = false;
468 bool queue_dig = false, queue_hp = false;
469 u32 long_hpd_pulse_mask = 0;
470 u32 short_hpd_pulse_mask = 0;
476 spin_lock(&dev_priv->irq_lock);
479 * Determine whether ->hpd_pulse() exists for each pin, and
480 * whether we have a short or a long pulse. This is needed
481 * as each pin may have up to two encoders (HDMI and DP) and
482 * only the one of them (DP) will have ->hpd_pulse().
484 for_each_intel_encoder(&dev_priv->drm, encoder) {
485 enum port port = encoder->port;
488 pin = encoder->hpd_pin;
489 if (!(BIT(pin) & pin_mask))
492 if (!intel_encoder_has_hpd_pulse(encoder))
495 long_hpd = long_mask & BIT(pin);
497 drm_dbg(&dev_priv->drm,
498 "digital hpd on [ENCODER:%d:%s] - %s\n",
499 encoder->base.base.id, encoder->base.name,
500 long_hpd ? "long" : "short");
504 long_hpd_pulse_mask |= BIT(pin);
505 dev_priv->hotplug.long_port_mask |= BIT(port);
507 short_hpd_pulse_mask |= BIT(pin);
508 dev_priv->hotplug.short_port_mask |= BIT(port);
512 /* Now process each pin just once */
513 for_each_hpd_pin(pin) {
516 if (!(BIT(pin) & pin_mask))
519 if (dev_priv->hotplug.stats[pin].state == HPD_DISABLED) {
521 * On GMCH platforms the interrupt mask bits only
522 * prevent irq generation, not the setting of the
523 * hotplug bits itself. So only WARN about unexpected
524 * interrupts on saner platforms.
526 drm_WARN_ONCE(&dev_priv->drm, !HAS_GMCH(dev_priv),
527 "Received HPD interrupt on pin %d although disabled\n",
532 if (dev_priv->hotplug.stats[pin].state != HPD_ENABLED)
536 * Delegate to ->hpd_pulse() if one of the encoders for this
537 * pin has it, otherwise let the hotplug_work deal with this
540 if (((short_hpd_pulse_mask | long_hpd_pulse_mask) & BIT(pin))) {
541 long_hpd = long_hpd_pulse_mask & BIT(pin);
543 dev_priv->hotplug.event_bits |= BIT(pin);
548 if (intel_hpd_irq_storm_detect(dev_priv, pin, long_hpd)) {
549 dev_priv->hotplug.event_bits &= ~BIT(pin);
550 storm_detected = true;
556 * Disable any IRQs that storms were detected on. Polling enablement
557 * happens later in our hotplug work.
559 if (storm_detected && dev_priv->display_irqs_enabled)
560 dev_priv->display.hpd_irq_setup(dev_priv);
561 spin_unlock(&dev_priv->irq_lock);
564 * Our hotplug handler can grab modeset locks (by calling down into the
565 * fb helpers). Hence it must not be run on our own dev-priv->wq work
566 * queue for otherwise the flush_work in the pageflip code will
570 queue_work(dev_priv->hotplug.dp_wq, &dev_priv->hotplug.dig_port_work);
572 queue_delayed_work(system_wq, &dev_priv->hotplug.hotplug_work, 0);
576 * intel_hpd_init - initializes and enables hpd support
577 * @dev_priv: i915 device instance
579 * This function enables the hotplug support. It requires that interrupts have
580 * already been enabled with intel_irq_init_hw(). From this point on hotplug and
581 * poll request can run concurrently to other code, so locking rules must be
584 * This is a separate step from interrupt enabling to simplify the locking rules
585 * in the driver load and resume code.
587 * Also see: intel_hpd_poll_init(), which enables connector polling
589 void intel_hpd_init(struct drm_i915_private *dev_priv)
593 for_each_hpd_pin(i) {
594 dev_priv->hotplug.stats[i].count = 0;
595 dev_priv->hotplug.stats[i].state = HPD_ENABLED;
598 WRITE_ONCE(dev_priv->hotplug.poll_enabled, false);
599 schedule_work(&dev_priv->hotplug.poll_init_work);
602 * Interrupt setup is already guaranteed to be single-threaded, this is
603 * just to make the assert_spin_locked checks happy.
605 if (dev_priv->display_irqs_enabled && dev_priv->display.hpd_irq_setup) {
606 spin_lock_irq(&dev_priv->irq_lock);
607 if (dev_priv->display_irqs_enabled)
608 dev_priv->display.hpd_irq_setup(dev_priv);
609 spin_unlock_irq(&dev_priv->irq_lock);
613 static void i915_hpd_poll_init_work(struct work_struct *work)
615 struct drm_i915_private *dev_priv =
616 container_of(work, struct drm_i915_private,
617 hotplug.poll_init_work);
618 struct drm_device *dev = &dev_priv->drm;
619 struct drm_connector_list_iter conn_iter;
620 struct intel_connector *connector;
623 mutex_lock(&dev->mode_config.mutex);
625 enabled = READ_ONCE(dev_priv->hotplug.poll_enabled);
627 drm_connector_list_iter_begin(dev, &conn_iter);
628 for_each_intel_connector_iter(connector, &conn_iter) {
631 pin = intel_connector_hpd_pin(connector);
635 connector->base.polled = connector->polled;
637 if (enabled && connector->base.polled == DRM_CONNECTOR_POLL_HPD)
638 connector->base.polled = DRM_CONNECTOR_POLL_CONNECT |
639 DRM_CONNECTOR_POLL_DISCONNECT;
641 drm_connector_list_iter_end(&conn_iter);
644 drm_kms_helper_poll_enable(dev);
646 mutex_unlock(&dev->mode_config.mutex);
649 * We might have missed any hotplugs that happened while we were
650 * in the middle of disabling polling
653 drm_helper_hpd_irq_event(dev);
657 * intel_hpd_poll_init - enables/disables polling for connectors with hpd
658 * @dev_priv: i915 device instance
660 * This function enables polling for all connectors, regardless of whether or
661 * not they support hotplug detection. Under certain conditions HPD may not be
662 * functional. On most Intel GPUs, this happens when we enter runtime suspend.
663 * On Valleyview and Cherryview systems, this also happens when we shut off all
666 * Since this function can get called in contexts where we're already holding
667 * dev->mode_config.mutex, we do the actual hotplug enabling in a seperate
670 * Also see: intel_hpd_init(), which restores hpd handling.
672 void intel_hpd_poll_init(struct drm_i915_private *dev_priv)
674 WRITE_ONCE(dev_priv->hotplug.poll_enabled, true);
677 * We might already be holding dev->mode_config.mutex, so do this in a
679 * As well, there's no issue if we race here since we always reschedule
682 schedule_work(&dev_priv->hotplug.poll_init_work);
685 void intel_hpd_init_work(struct drm_i915_private *dev_priv)
687 INIT_DELAYED_WORK(&dev_priv->hotplug.hotplug_work,
688 i915_hotplug_work_func);
689 INIT_WORK(&dev_priv->hotplug.dig_port_work, i915_digport_work_func);
690 INIT_WORK(&dev_priv->hotplug.poll_init_work, i915_hpd_poll_init_work);
691 INIT_DELAYED_WORK(&dev_priv->hotplug.reenable_work,
692 intel_hpd_irq_storm_reenable_work);
695 void intel_hpd_cancel_work(struct drm_i915_private *dev_priv)
697 spin_lock_irq(&dev_priv->irq_lock);
699 dev_priv->hotplug.long_port_mask = 0;
700 dev_priv->hotplug.short_port_mask = 0;
701 dev_priv->hotplug.event_bits = 0;
702 dev_priv->hotplug.retry_bits = 0;
704 spin_unlock_irq(&dev_priv->irq_lock);
706 cancel_work_sync(&dev_priv->hotplug.dig_port_work);
707 cancel_delayed_work_sync(&dev_priv->hotplug.hotplug_work);
708 cancel_work_sync(&dev_priv->hotplug.poll_init_work);
709 cancel_delayed_work_sync(&dev_priv->hotplug.reenable_work);
712 bool intel_hpd_disable(struct drm_i915_private *dev_priv, enum hpd_pin pin)
719 spin_lock_irq(&dev_priv->irq_lock);
720 if (dev_priv->hotplug.stats[pin].state == HPD_ENABLED) {
721 dev_priv->hotplug.stats[pin].state = HPD_DISABLED;
724 spin_unlock_irq(&dev_priv->irq_lock);
729 void intel_hpd_enable(struct drm_i915_private *dev_priv, enum hpd_pin pin)
734 spin_lock_irq(&dev_priv->irq_lock);
735 dev_priv->hotplug.stats[pin].state = HPD_ENABLED;
736 spin_unlock_irq(&dev_priv->irq_lock);