35  * Simply put, hotplug occurs when a display is connected to or disconnected
37  * Display Port short pulses and MST devices involved, complicating matters.
48  * further processing to appropriate bottom halves (Display Port specific and
51  * The Display Port work function i915_digport_work_func() calls into
71  * seen when display port sink is connected, hence on platforms whose DP
74  * this is specific to DP sinks handled by this routine and any other display
126  * stored in @dev_priv->display.hotplug.hpd_storm_threshold which defaults to
132  * &dev_priv->display.hotplug.hpd_storm_threshold. However, some older systems also
147 	struct intel_hotplug *hpd = &dev_priv->display.hotplug;  in intel_hpd_irq_storm_detect()
155 	    (!long_hpd && !dev_priv->display.hotplug.hpd_short_storm_enabled))  in intel_hpd_irq_storm_detect()
197 		    dev_priv->display.hotplug.stats[pin].state != HPD_MARK_DISABLED)  in intel_hpd_irq_storm_switch_to_polling()
205 		dev_priv->display.hotplug.stats[pin].state = HPD_DISABLED;  in intel_hpd_irq_storm_switch_to_polling()
216 				 &dev_priv->display.hotplug.reenable_work,  in intel_hpd_irq_storm_switch_to_polling()
225 			     display.hotplug.reenable_work.work);  in intel_hpd_irq_storm_reenable_work()
239 		    dev_priv->display.hotplug.stats[pin].state != HPD_DISABLED)  in intel_hpd_irq_storm_reenable_work()
251 		if (dev_priv->display.hotplug.stats[pin].state == HPD_DISABLED)  in intel_hpd_irq_storm_reenable_work()
252 			dev_priv->display.hotplug.stats[pin].state = HPD_ENABLED;  in intel_hpd_irq_storm_reenable_work()
303 		container_of(work, struct drm_i915_private, display.hotplug.dig_port_work);  in i915_digport_work_func()
309 	long_port_mask = dev_priv->display.hotplug.long_port_mask;  in i915_digport_work_func()
310 	dev_priv->display.hotplug.long_port_mask = 0;  in i915_digport_work_func()
311 	short_port_mask = dev_priv->display.hotplug.short_port_mask;  in i915_digport_work_func()
312 	dev_priv->display.hotplug.short_port_mask = 0;  in i915_digport_work_func()
341 		dev_priv->display.hotplug.event_bits |= old_bits;  in i915_digport_work_func()
344 				   &dev_priv->display.hotplug.hotplug_work, 0);  in i915_digport_work_func()
360 	i915->display.hotplug.short_port_mask |= BIT(dig_port->base.port);  in intel_hpd_trigger_irq()
363 	queue_work(i915->display.hotplug.dp_wq, &i915->display.hotplug.dig_port_work);  in intel_hpd_trigger_irq()
373 			     display.hotplug.hotplug_work.work);  in i915_hotplug_work_func()
387 	hpd_event_bits = dev_priv->display.hotplug.event_bits;  in i915_hotplug_work_func()
388 	dev_priv->display.hotplug.event_bits = 0;  in i915_hotplug_work_func()
389 	hpd_retry_bits = dev_priv->display.hotplug.retry_bits;  in i915_hotplug_work_func()
390 	dev_priv->display.hotplug.retry_bits = 0;  in i915_hotplug_work_func()
398 	if (dev_priv->display.hotplug.ignore_long_hpd) {  in i915_hotplug_work_func()
460 		dev_priv->display.hotplug.retry_bits |= retry;  in i915_hotplug_work_func()
464 				 &dev_priv->display.hotplug.hotplug_work,  in i915_hotplug_work_func()
528 			dev_priv->display.hotplug.long_port_mask |= BIT(port);  in intel_hpd_irq_handler()
531 			dev_priv->display.hotplug.short_port_mask |= BIT(port);  in intel_hpd_irq_handler()
542 		if (dev_priv->display.hotplug.stats[pin].state == HPD_DISABLED) {  in intel_hpd_irq_handler()
555 		if (dev_priv->display.hotplug.stats[pin].state != HPD_ENABLED)  in intel_hpd_irq_handler()
566 			dev_priv->display.hotplug.event_bits |= BIT(pin);  in intel_hpd_irq_handler()
572 			dev_priv->display.hotplug.event_bits &= ~BIT(pin);  in intel_hpd_irq_handler()
593 		queue_work(dev_priv->display.hotplug.dp_wq, &dev_priv->display.hotplug.dig_port_work);  in intel_hpd_irq_handler()
596 				   &dev_priv->display.hotplug.hotplug_work, 0);  in intel_hpd_irq_handler()
621 		dev_priv->display.hotplug.stats[i].count = 0;  in intel_hpd_init()
622 		dev_priv->display.hotplug.stats[i].state = HPD_ENABLED;  in intel_hpd_init()
638 			     display.hotplug.poll_init_work);  in i915_hpd_poll_init_work()
645 	enabled = READ_ONCE(dev_priv->display.hotplug.poll_enabled);  in i915_hpd_poll_init_work()
698 	WRITE_ONCE(dev_priv->display.hotplug.poll_enabled, true);  in intel_hpd_poll_enable()
707 		   &dev_priv->display.hotplug.poll_init_work);  in intel_hpd_poll_enable()
734 	WRITE_ONCE(dev_priv->display.hotplug.poll_enabled, false);  in intel_hpd_poll_disable()
736 		   &dev_priv->display.hotplug.poll_init_work);  in intel_hpd_poll_disable()
741 	INIT_DELAYED_WORK(&i915->display.hotplug.hotplug_work,  in intel_hpd_init_early()
743 	INIT_WORK(&i915->display.hotplug.dig_port_work, i915_digport_work_func);  in intel_hpd_init_early()
744 	INIT_WORK(&i915->display.hotplug.poll_init_work, i915_hpd_poll_init_work);  in intel_hpd_init_early()
745 	INIT_DELAYED_WORK(&i915->display.hotplug.reenable_work,  in intel_hpd_init_early()
748 	i915->display.hotplug.hpd_storm_threshold = HPD_STORM_DEFAULT_THRESHOLD;  in intel_hpd_init_early()
755 	i915->display.hotplug.hpd_short_storm_enabled = !HAS_DP_MST(i915);  in intel_hpd_init_early()
765 	dev_priv->display.hotplug.long_port_mask = 0;  in intel_hpd_cancel_work()
766 	dev_priv->display.hotplug.short_port_mask = 0;  in intel_hpd_cancel_work()
767 	dev_priv->display.hotplug.event_bits = 0;  in intel_hpd_cancel_work()
768 	dev_priv->display.hotplug.retry_bits = 0;  in intel_hpd_cancel_work()
772 	cancel_work_sync(&dev_priv->display.hotplug.dig_port_work);  in intel_hpd_cancel_work()
773 	cancel_delayed_work_sync(&dev_priv->display.hotplug.hotplug_work);  in intel_hpd_cancel_work()
774 	cancel_work_sync(&dev_priv->display.hotplug.poll_init_work);  in intel_hpd_cancel_work()
775 	cancel_delayed_work_sync(&dev_priv->display.hotplug.reenable_work);  in intel_hpd_cancel_work()
786 	if (dev_priv->display.hotplug.stats[pin].state == HPD_ENABLED) {  in intel_hpd_disable()
787 		dev_priv->display.hotplug.stats[pin].state = HPD_DISABLED;  in intel_hpd_disable()
801 	dev_priv->display.hotplug.stats[pin].state = HPD_ENABLED;  in intel_hpd_enable()
808 	struct intel_hotplug *hotplug = &dev_priv->display.hotplug;  in i915_hpd_storm_ctl_show()
814 	flush_work(&dev_priv->display.hotplug.dig_port_work);  in i915_hpd_storm_ctl_show()
815 	flush_delayed_work(&dev_priv->display.hotplug.hotplug_work);  in i915_hpd_storm_ctl_show()
830 	struct intel_hotplug *hotplug = &dev_priv->display.hotplug;  in i915_hpd_storm_ctl_write()
869 	flush_delayed_work(&dev_priv->display.hotplug.reenable_work);  in i915_hpd_storm_ctl_write()
893 		   str_yes_no(dev_priv->display.hotplug.hpd_short_storm_enabled));  in i915_hpd_short_storm_ctl_show()
911 	struct intel_hotplug *hotplug = &dev_priv->display.hotplug;  in i915_hpd_short_storm_ctl_write()
947 	flush_delayed_work(&dev_priv->display.hotplug.reenable_work);  in i915_hpd_short_storm_ctl_write()
970 			    &i915->display.hotplug.ignore_long_hpd);  in intel_hpd_debugfs_register()