41  * handlers gather the hotplug detect (HPD) information from relevant registers
70  * callback is handled by i915_digport_work_func reenabling of hpd is not
80  * @port: the hpd port to get associated pin
111  * intel_hpd_irq_storm_detect - gather stats and detect HPD IRQ storm on a pin
114  * @long_hpd: whether the HPD IRQ was long or short
116  * Gather stats about HPD IRQs from the specified @pin, and detect IRQ
134  * The HPD threshold can be controlled through i915_hpd_storm_ctl in debugfs,
142 	struct i915_hotplug *hpd = &dev_priv->hotplug;  in intel_hpd_irq_storm_detect()  local
143 	unsigned long start = hpd->stats[pin].last_jiffies;  in intel_hpd_irq_storm_detect()
146 	const int threshold = hpd->hpd_storm_threshold;  in intel_hpd_irq_storm_detect()
154 		hpd->stats[pin].last_jiffies = jiffies;  in intel_hpd_irq_storm_detect()
155 		hpd->stats[pin].count = 0;  in intel_hpd_irq_storm_detect()
158 	hpd->stats[pin].count += increment;  in intel_hpd_irq_storm_detect()
159 	if (hpd->stats[pin].count > threshold) {  in intel_hpd_irq_storm_detect()
160 		hpd->stats[pin].state = HPD_MARK_DISABLED;  in intel_hpd_irq_storm_detect()
162 			    "HPD interrupt storm detected on PIN %d\n", pin);  in intel_hpd_irq_storm_detect()
166 			    "Received HPD interrupt on PIN %d - cnt: %d\n",  in intel_hpd_irq_storm_detect()
168 			      hpd->stats[pin].count);  in intel_hpd_irq_storm_detect()
197 			 "HPD interrupt storm detected on connector %s: "  in intel_hpd_irq_storm_switch_to_polling()
246 				"Reenabling HPD on connector %s\n",  in intel_hpd_irq_storm_reenable_work()
336 			/* fall back to old school hpd */  in i915_digport_work_func()
350  * intel_hpd_trigger_irq - trigger an hpd irq event for a port
353  * 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()
439 	/* Remove shared HPD pins that have changed */  in i915_hotplug_work_func()
455  * @pin_mask: a mask of hpd pins that have triggered the irq
456  * @long_mask: a mask of hpd pins that may be long hpd pulses
460  * decode the appropriate registers into bitmasks about hpd pins that have
503 			"digital hpd on [ENCODER:%d:%s] - %s\n",  in intel_hpd_irq_handler()
532 				      "Received HPD interrupt on pin %d although disabled\n",  in intel_hpd_irq_handler()
581  * intel_hpd_init - initializes and enables hpd support
659  * intel_hpd_poll_enable - enable polling for connectors with hpd
662  * This function enables polling for all connectors which support HPD.
663  * Under certain conditions HPD may not be functional. On most Intel GPUs,
691  * intel_hpd_poll_disable - disable polling for connectors with hpd
694  * This function disables polling for all connectors which support HPD.
695  * Under certain conditions HPD may not be functional. On most Intel GPUs,