34  * Simply put, hotplug occurs when a display is connected to or disconnected
36  * Display Port short pulses and MST devices involved, complicating matters.
47  * further processing to appropriate bottom halves (Display Port specific and
50  * The Display Port work function i915_digport_work_func() calls into
70  * seen when display port sink is connected, hence on platforms whose DP
73  * this is specific to DP sinks handled by this routine and any other display
122  * stored in @dev_priv->display.hotplug.hpd_storm_threshold which defaults to
128  * &dev_priv->display.hotplug.hpd_storm_threshold. However, some older systems also
143 	struct intel_hotplug *hpd = &dev_priv->display.hotplug;  in intel_hpd_irq_storm_detect()
151 	    (!long_hpd && !dev_priv->display.hotplug.hpd_short_storm_enabled))  in intel_hpd_irq_storm_detect()
194 		    dev_priv->display.hotplug.stats[pin].state != HPD_MARK_DISABLED)  in intel_hpd_irq_storm_switch_to_polling()
202 		dev_priv->display.hotplug.stats[pin].state = HPD_DISABLED;  in intel_hpd_irq_storm_switch_to_polling()
212 		mod_delayed_work(system_wq, &dev_priv->display.hotplug.reenable_work,  in intel_hpd_irq_storm_switch_to_polling()
221 			     display.hotplug.reenable_work.work);  in intel_hpd_irq_storm_reenable_work()
236 		    dev_priv->display.hotplug.stats[pin].state != HPD_DISABLED)  in intel_hpd_irq_storm_reenable_work()
248 		if (dev_priv->display.hotplug.stats[pin].state == HPD_DISABLED)  in intel_hpd_irq_storm_reenable_work()
249 			dev_priv->display.hotplug.stats[pin].state = HPD_ENABLED;  in intel_hpd_irq_storm_reenable_work()
300 		container_of(work, struct drm_i915_private, display.hotplug.dig_port_work);  in i915_digport_work_func()
306 	long_port_mask = dev_priv->display.hotplug.long_port_mask;  in i915_digport_work_func()
307 	dev_priv->display.hotplug.long_port_mask = 0;  in i915_digport_work_func()
308 	short_port_mask = dev_priv->display.hotplug.short_port_mask;  in i915_digport_work_func()
309 	dev_priv->display.hotplug.short_port_mask = 0;  in i915_digport_work_func()
338 		dev_priv->display.hotplug.event_bits |= old_bits;  in i915_digport_work_func()
340 		queue_delayed_work(system_wq, &dev_priv->display.hotplug.hotplug_work, 0);  in i915_digport_work_func()
356 	i915->display.hotplug.short_port_mask |= BIT(dig_port->base.port);  in intel_hpd_trigger_irq()
359 	queue_work(i915->display.hotplug.dp_wq, &i915->display.hotplug.dig_port_work);  in intel_hpd_trigger_irq()
369 			     display.hotplug.hotplug_work.work);  in i915_hotplug_work_func()
382 	hpd_event_bits = dev_priv->display.hotplug.event_bits;  in i915_hotplug_work_func()
383 	dev_priv->display.hotplug.event_bits = 0;  in i915_hotplug_work_func()
384 	hpd_retry_bits = dev_priv->display.hotplug.retry_bits;  in i915_hotplug_work_func()
385 	dev_priv->display.hotplug.retry_bits = 0;  in i915_hotplug_work_func()
438 		dev_priv->display.hotplug.retry_bits |= retry;  in i915_hotplug_work_func()
441 		mod_delayed_work(system_wq, &dev_priv->display.hotplug.hotplug_work,  in i915_hotplug_work_func()
505 			dev_priv->display.hotplug.long_port_mask |= BIT(port);  in intel_hpd_irq_handler()
508 			dev_priv->display.hotplug.short_port_mask |= BIT(port);  in intel_hpd_irq_handler()
519 		if (dev_priv->display.hotplug.stats[pin].state == HPD_DISABLED) {  in intel_hpd_irq_handler()
532 		if (dev_priv->display.hotplug.stats[pin].state != HPD_ENABLED)  in intel_hpd_irq_handler()
543 			dev_priv->display.hotplug.event_bits |= BIT(pin);  in intel_hpd_irq_handler()
549 			dev_priv->display.hotplug.event_bits &= ~BIT(pin);  in intel_hpd_irq_handler()
570 		queue_work(dev_priv->display.hotplug.dp_wq, &dev_priv->display.hotplug.dig_port_work);  in intel_hpd_irq_handler()
572 		queue_delayed_work(system_wq, &dev_priv->display.hotplug.hotplug_work, 0);  in intel_hpd_irq_handler()
597 		dev_priv->display.hotplug.stats[i].count = 0;  in intel_hpd_init()
598 		dev_priv->display.hotplug.stats[i].state = HPD_ENABLED;  in intel_hpd_init()
614 			     display.hotplug.poll_init_work);  in i915_hpd_poll_init_work()
622 	enabled = READ_ONCE(dev_priv->display.hotplug.poll_enabled);  in i915_hpd_poll_init_work()
675 	WRITE_ONCE(dev_priv->display.hotplug.poll_enabled, true);  in intel_hpd_poll_enable()
683 	schedule_work(&dev_priv->display.hotplug.poll_init_work);  in intel_hpd_poll_enable()
710 	WRITE_ONCE(dev_priv->display.hotplug.poll_enabled, false);  in intel_hpd_poll_disable()
711 	schedule_work(&dev_priv->display.hotplug.poll_init_work);  in intel_hpd_poll_disable()
716 	INIT_DELAYED_WORK(&dev_priv->display.hotplug.hotplug_work,  in intel_hpd_init_work()
718 	INIT_WORK(&dev_priv->display.hotplug.dig_port_work, i915_digport_work_func);  in intel_hpd_init_work()
719 	INIT_WORK(&dev_priv->display.hotplug.poll_init_work, i915_hpd_poll_init_work);  in intel_hpd_init_work()
720 	INIT_DELAYED_WORK(&dev_priv->display.hotplug.reenable_work,  in intel_hpd_init_work()
731 	dev_priv->display.hotplug.long_port_mask = 0;  in intel_hpd_cancel_work()
732 	dev_priv->display.hotplug.short_port_mask = 0;  in intel_hpd_cancel_work()
733 	dev_priv->display.hotplug.event_bits = 0;  in intel_hpd_cancel_work()
734 	dev_priv->display.hotplug.retry_bits = 0;  in intel_hpd_cancel_work()
738 	cancel_work_sync(&dev_priv->display.hotplug.dig_port_work);  in intel_hpd_cancel_work()
739 	cancel_delayed_work_sync(&dev_priv->display.hotplug.hotplug_work);  in intel_hpd_cancel_work()
740 	cancel_work_sync(&dev_priv->display.hotplug.poll_init_work);  in intel_hpd_cancel_work()
741 	cancel_delayed_work_sync(&dev_priv->display.hotplug.reenable_work);  in intel_hpd_cancel_work()
752 	if (dev_priv->display.hotplug.stats[pin].state == HPD_ENABLED) {  in intel_hpd_disable()
753 		dev_priv->display.hotplug.stats[pin].state = HPD_DISABLED;  in intel_hpd_disable()
767 	dev_priv->display.hotplug.stats[pin].state = HPD_ENABLED;  in intel_hpd_enable()