43  * handlers gather the hotplug detect (HPD) information from relevant registers
72  * callback is handled by i915_digport_work_func reenabling of hpd is not
82  * @port: the hpd port to get associated pin
116  * intel_hpd_irq_storm_detect - gather stats and detect HPD IRQ storm on a pin
119  * @long_hpd: whether the HPD IRQ was long or short
121  * Gather stats about HPD IRQs from the specified @pin, and detect IRQ
139  * The HPD threshold can be controlled through i915_hpd_storm_ctl in debugfs,
147 	struct intel_hotplug *hpd = &dev_priv->display.hotplug;  in intel_hpd_irq_storm_detect()  local
148 	unsigned long start = hpd->stats[pin].last_jiffies;  in intel_hpd_irq_storm_detect()
151 	const int threshold = hpd->hpd_storm_threshold;  in intel_hpd_irq_storm_detect()
159 		hpd->stats[pin].last_jiffies = jiffies;  in intel_hpd_irq_storm_detect()
160 		hpd->stats[pin].count = 0;  in intel_hpd_irq_storm_detect()
163 	hpd->stats[pin].count += increment;  in intel_hpd_irq_storm_detect()
164 	if (hpd->stats[pin].count > threshold) {  in intel_hpd_irq_storm_detect()
165 		hpd->stats[pin].state = HPD_MARK_DISABLED;  in intel_hpd_irq_storm_detect()
167 			    "HPD interrupt storm detected on PIN %d\n", pin);  in intel_hpd_irq_storm_detect()
171 			    "Received HPD interrupt on PIN %d - cnt: %d\n",  in intel_hpd_irq_storm_detect()
173 			      hpd->stats[pin].count);  in intel_hpd_irq_storm_detect()
201 			 "HPD interrupt storm detected on connector %s: "  in intel_hpd_irq_storm_switch_to_polling()
244 				"Reenabling HPD on connector %s\n",  in intel_hpd_irq_storm_reenable_work()
334 			/* fall back to old school hpd */  in i915_digport_work_func()
349  * intel_hpd_trigger_irq - trigger an hpd irq event for a port
352  * Trigger an HPD interrupt event for the given port, emulating a short pulse
392 	/* Enable polling for connectors which had HPD IRQ storms */  in i915_hotplug_work_func()
397 	/* Skip calling encode hotplug handlers if ignore long HPD set*/  in i915_hotplug_work_func()
399 		drm_dbg_kms(&dev_priv->drm, "Ignore HPD flag on - skip encoder hotplug handlers\n");  in i915_hotplug_work_func()
456 	/* Remove shared HPD pins that have changed */  in i915_hotplug_work_func()
473  * @pin_mask: a mask of hpd pins that have triggered the irq
474  * @long_mask: a mask of hpd pins that may be long hpd pulses
478  * decode the appropriate registers into bitmasks about hpd pins that have
521 			"digital hpd on [ENCODER:%d:%s] - %s\n",  in intel_hpd_irq_handler()
550 				      "Received HPD interrupt on pin %d although disabled\n",  in intel_hpd_irq_handler()
600  * intel_hpd_init - initializes and enables hpd support
677  * intel_hpd_poll_enable - enable polling for connectors with hpd
680  * This function enables polling for all connectors which support HPD.
681  * Under certain conditions HPD may not be functional. On most Intel GPUs,
711  * intel_hpd_poll_disable - disable polling for connectors with hpd
714  * This function disables polling for all connectors which support HPD.
715  * Under certain conditions HPD may not be functional. On most Intel GPUs,
749 	/* If we have MST support, we want to avoid doing short HPD IRQ storm  in intel_hpd_init_early()
750 	 * detection, as short HPD storms will occur as a natural part of  in intel_hpd_init_early()
810 	/* Synchronize with everything first in case there's been an HPD  in i915_hpd_storm_ctl_show()
856 			    "Setting HPD storm detection threshold to %d\n",  in i915_hpd_storm_ctl_write()
859 		drm_dbg_kms(&dev_priv->drm, "Disabling HPD storm detection\n");  in i915_hpd_storm_ctl_write()
863 	/* Reset the HPD storm stats so we don't accidentally trigger a storm */  in i915_hpd_storm_ctl_write()
868 	/* Re-enable hpd immediately if we were in an irq storm */  in i915_hpd_storm_ctl_write()
936 	drm_dbg_kms(&dev_priv->drm, "%sabling HPD short storm detection\n",  in i915_hpd_short_storm_ctl_write()
941 	/* Reset the HPD storm stats so we don't accidentally trigger a storm */  in i915_hpd_short_storm_ctl_write()
946 	/* Re-enable hpd immediately if we were in an irq storm */  in i915_hpd_short_storm_ctl_write()