36  * Simply put, hotplug occurs when a display is connected to or disconnected
38  * Display Port short pulses and MST devices involved, complicating matters.
49  * further processing to appropriate bottom halves (Display Port specific and
52  * The Display Port work function i915_digport_work_func() calls into
72  * seen when display port sink is connected, hence on platforms whose DP
75  * this is specific to DP sinks handled by this routine and any other display
127  * stored in @dev_priv->display.hotplug.hpd_storm_threshold which defaults to
133  * &dev_priv->display.hotplug.hpd_storm_threshold. However, some older systems also
148 	struct intel_hotplug *hpd = &dev_priv->display.hotplug;  in intel_hpd_irq_storm_detect()
156 	    (!long_hpd && !dev_priv->display.hotplug.hpd_short_storm_enabled))  in intel_hpd_irq_storm_detect()
198 		    dev_priv->display.hotplug.stats[pin].state != HPD_MARK_DISABLED)  in intel_hpd_irq_storm_switch_to_polling()
206 		dev_priv->display.hotplug.stats[pin].state = HPD_DISABLED;  in intel_hpd_irq_storm_switch_to_polling()
217 				 &dev_priv->display.hotplug.reenable_work,  in intel_hpd_irq_storm_switch_to_polling()
226 			     display.hotplug.reenable_work.work);  in intel_hpd_irq_storm_reenable_work()
240 		    dev_priv->display.hotplug.stats[pin].state != HPD_DISABLED)  in intel_hpd_irq_storm_reenable_work()
252 		if (dev_priv->display.hotplug.stats[pin].state == HPD_DISABLED)  in intel_hpd_irq_storm_reenable_work()
253 			dev_priv->display.hotplug.stats[pin].state = HPD_ENABLED;  in intel_hpd_irq_storm_reenable_work()
312 		container_of(work, struct drm_i915_private, display.hotplug.dig_port_work);  in i915_digport_work_func()
318 	long_port_mask = dev_priv->display.hotplug.long_port_mask;  in i915_digport_work_func()
319 	dev_priv->display.hotplug.long_port_mask = 0;  in i915_digport_work_func()
320 	short_port_mask = dev_priv->display.hotplug.short_port_mask;  in i915_digport_work_func()
321 	dev_priv->display.hotplug.short_port_mask = 0;  in i915_digport_work_func()
350 		dev_priv->display.hotplug.event_bits |= old_bits;  in i915_digport_work_func()
353 				   &dev_priv->display.hotplug.hotplug_work, 0);  in i915_digport_work_func()
369 	i915->display.hotplug.short_port_mask |= BIT(dig_port->base.port);  in intel_hpd_trigger_irq()
372 	queue_work(i915->display.hotplug.dp_wq, &i915->display.hotplug.dig_port_work);  in intel_hpd_trigger_irq()
382 			     display.hotplug.hotplug_work.work);  in i915_hotplug_work_func()
396 	hpd_event_bits = dev_priv->display.hotplug.event_bits;  in i915_hotplug_work_func()
397 	dev_priv->display.hotplug.event_bits = 0;  in i915_hotplug_work_func()
398 	hpd_retry_bits = dev_priv->display.hotplug.retry_bits;  in i915_hotplug_work_func()
399 	dev_priv->display.hotplug.retry_bits = 0;  in i915_hotplug_work_func()
407 	if (dev_priv->display.hotplug.ignore_long_hpd) {  in i915_hotplug_work_func()
469 		dev_priv->display.hotplug.retry_bits |= retry;  in i915_hotplug_work_func()
473 				 &dev_priv->display.hotplug.hotplug_work,  in i915_hotplug_work_func()
537 			dev_priv->display.hotplug.long_port_mask |= BIT(port);  in intel_hpd_irq_handler()
540 			dev_priv->display.hotplug.short_port_mask |= BIT(port);  in intel_hpd_irq_handler()
551 		if (dev_priv->display.hotplug.stats[pin].state == HPD_DISABLED) {  in intel_hpd_irq_handler()
564 		if (dev_priv->display.hotplug.stats[pin].state != HPD_ENABLED)  in intel_hpd_irq_handler()
575 			dev_priv->display.hotplug.event_bits |= BIT(pin);  in intel_hpd_irq_handler()
581 			dev_priv->display.hotplug.event_bits &= ~BIT(pin);  in intel_hpd_irq_handler()
602 		queue_work(dev_priv->display.hotplug.dp_wq, &dev_priv->display.hotplug.dig_port_work);  in intel_hpd_irq_handler()
605 				   &dev_priv->display.hotplug.hotplug_work, 0);  in intel_hpd_irq_handler()
630 		dev_priv->display.hotplug.stats[i].count = 0;  in intel_hpd_init()
631 		dev_priv->display.hotplug.stats[i].state = HPD_ENABLED;  in intel_hpd_init()
690 			     display.hotplug.poll_init_work);  in i915_hpd_poll_init_work()
698 	enabled = READ_ONCE(dev_priv->display.hotplug.poll_enabled);  in i915_hpd_poll_init_work()
709 			    READ_ONCE(dev_priv->display.hotplug.poll_enabled));  in i915_hpd_poll_init_work()
710 		cancel_work(&dev_priv->display.hotplug.poll_init_work);  in i915_hpd_poll_init_work()
769 	WRITE_ONCE(dev_priv->display.hotplug.poll_enabled, true);  in intel_hpd_poll_enable()
778 		   &dev_priv->display.hotplug.poll_init_work);  in intel_hpd_poll_enable()
805 	WRITE_ONCE(dev_priv->display.hotplug.poll_enabled, false);  in intel_hpd_poll_disable()
807 		   &dev_priv->display.hotplug.poll_init_work);  in intel_hpd_poll_disable()
812 	INIT_DELAYED_WORK(&i915->display.hotplug.hotplug_work,  in intel_hpd_init_early()
814 	INIT_WORK(&i915->display.hotplug.dig_port_work, i915_digport_work_func);  in intel_hpd_init_early()
815 	INIT_WORK(&i915->display.hotplug.poll_init_work, i915_hpd_poll_init_work);  in intel_hpd_init_early()
816 	INIT_DELAYED_WORK(&i915->display.hotplug.reenable_work,  in intel_hpd_init_early()
819 	i915->display.hotplug.hpd_storm_threshold = HPD_STORM_DEFAULT_THRESHOLD;  in intel_hpd_init_early()
826 	i915->display.hotplug.hpd_short_storm_enabled = !HAS_DP_MST(i915);  in intel_hpd_init_early()
836 	dev_priv->display.hotplug.long_port_mask = 0;  in intel_hpd_cancel_work()
837 	dev_priv->display.hotplug.short_port_mask = 0;  in intel_hpd_cancel_work()
838 	dev_priv->display.hotplug.event_bits = 0;  in intel_hpd_cancel_work()
839 	dev_priv->display.hotplug.retry_bits = 0;  in intel_hpd_cancel_work()
843 	cancel_work_sync(&dev_priv->display.hotplug.dig_port_work);  in intel_hpd_cancel_work()
844 	cancel_delayed_work_sync(&dev_priv->display.hotplug.hotplug_work);  in intel_hpd_cancel_work()
845 	cancel_work_sync(&dev_priv->display.hotplug.poll_init_work);  in intel_hpd_cancel_work()
846 	cancel_delayed_work_sync(&dev_priv->display.hotplug.reenable_work);  in intel_hpd_cancel_work()
857 	if (dev_priv->display.hotplug.stats[pin].state == HPD_ENABLED) {  in intel_hpd_disable()
858 		dev_priv->display.hotplug.stats[pin].state = HPD_DISABLED;  in intel_hpd_disable()
872 	dev_priv->display.hotplug.stats[pin].state = HPD_ENABLED;  in intel_hpd_enable()
879 	struct intel_hotplug *hotplug = &dev_priv->display.hotplug;  in i915_hpd_storm_ctl_show()
885 	flush_work(&dev_priv->display.hotplug.dig_port_work);  in i915_hpd_storm_ctl_show()
886 	flush_delayed_work(&dev_priv->display.hotplug.hotplug_work);  in i915_hpd_storm_ctl_show()
901 	struct intel_hotplug *hotplug = &dev_priv->display.hotplug;  in i915_hpd_storm_ctl_write()
940 	flush_delayed_work(&dev_priv->display.hotplug.reenable_work);  in i915_hpd_storm_ctl_write()
964 		   str_yes_no(dev_priv->display.hotplug.hpd_short_storm_enabled));  in i915_hpd_short_storm_ctl_show()
982 	struct intel_hotplug *hotplug = &dev_priv->display.hotplug;  in i915_hpd_short_storm_ctl_write()
1018 	flush_delayed_work(&dev_priv->display.hotplug.reenable_work);  in i915_hpd_short_storm_ctl_write()
1041 			    &i915->display.hotplug.ignore_long_hpd);  in intel_hpd_debugfs_register()