[PATCH v.2 09/12] DRM/i915: Disable HPD interrupt on pin when irq storm is detected.

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This patch disables hotplug interrupts if an 'interrupt storm'
has been detected.
Noise on the interrupt line renders the hotplug interrupt useless:
each hotplug event causes the devices to be rescanned which will
will only increase the system load.
Thus disable the hotplug interrupts and fall back to periodic
device polling.

Signed-off-by: Egbert Eich <eich at suse.de>
---
 drivers/gpu/drm/i915/i915_irq.c |   69 ++++++++++++++++++++++++++++++---------
 1 files changed, 53 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index e0cf629..8878fdd 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -96,7 +96,8 @@ static const u32 hpd_status_i915[] = { /* i915 and valleyview are the same */
 	PORTD_HOTPLUG_INT_STATUS   /* HPD_PORT_D */
 };
 
-
+static void ibx_hpd_irq_setup(struct drm_device *dev);
+static void i915_hpd_irq_setup(struct drm_device *dev);
 
 /* For display hotplug interrupt */
 static void
@@ -347,7 +348,11 @@ static void i915_hotplug_work_func(struct work_struct *work)
 						    hotplug_work);
 	struct drm_device *dev = dev_priv->dev;
 	struct drm_mode_config *mode_config = &dev->mode_config;
-	struct intel_encoder *encoder;
+	struct intel_connector *intel_connector;
+	struct intel_encoder *intel_encoder;
+	struct drm_connector *connector;
+	unsigned long irqflags;
+	bool connector_disabled = false;
 
 	/* HPD irq before everything is fully set up. */
 	if (!dev_priv->enable_hotplug_processing)
@@ -356,9 +361,29 @@ static void i915_hotplug_work_func(struct work_struct *work)
 	mutex_lock(&mode_config->mutex);
 	DRM_DEBUG_KMS("running encoder hotplug functions\n");
 
-	list_for_each_entry(encoder, &mode_config->encoder_list, base.head)
-		if (encoder->hot_plug)
-			encoder->hot_plug(encoder);
+	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
+	list_for_each_entry(connector, &mode_config->connector_list, head) {
+		intel_connector = to_intel_connector(connector);
+		intel_encoder = intel_connector->encoder;
+		if (intel_encoder->hpd_pin > HPD_NONE &&
+		    dev_priv->hpd_stats[intel_encoder->hpd_pin].hpd_mark == HPD_MARK_DISABLED &&
+		    connector->polled == DRM_CONNECTOR_POLL_HPD) {
+			pr_warn("HPD interrupt storm detected on connector %s disabling\n",
+				drm_get_connector_name(connector));
+			dev_priv->hpd_stats[intel_encoder->hpd_pin].hpd_mark = HPD_DISABLED;
+			connector->polled = DRM_CONNECTOR_POLL_CONNECT
+				| DRM_CONNECTOR_POLL_DISCONNECT;
+			connector_disabled = true;
+		}
+	}
+	if (connector_disabled)
+		drm_kms_helper_poll_enable(dev); /* if there were no outputs to poll, poll is disabled */
+
+	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
+
+	list_for_each_entry(intel_encoder, &mode_config->encoder_list, base.head)
+		if (intel_encoder->hot_plug)
+			intel_encoder->hot_plug(encoder);
 
 	mutex_unlock(&mode_config->mutex);
 
@@ -587,13 +612,14 @@ static void gen6_queue_rps_work(struct drm_i915_private *dev_priv,
 	queue_work(dev_priv->wq, &dev_priv->rps.work);
 }
 
-static inline void hotplug_irq_storm_detect(struct drm_device *dev,
+static inline bool hotplug_irq_storm_detect(struct drm_device *dev,
 					    u32 hotplug_trigger,
 					    const u32 *hpd)
 {
 	drm_i915_private_t *dev_priv = dev->dev_private;
 	unsigned long irqflags;
 	int i;
+	bool ret = false;
 
 	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
 
@@ -607,12 +633,15 @@ static inline void hotplug_irq_storm_detect(struct drm_device *dev,
 			} else if (dev_priv->hpd_stats[i].hpd_cnt > 5) {
 				dev_priv->hpd_stats[i].hpd_mark = HPD_MARK_DISABLED;
 				DRM_DEBUG_KMS("HPD interrupt storm detected on  PIN %d\n", i);
+				ret = true;
 			} else
 				dev_priv->hpd_stats[i].hpd_cnt++;
 		}
 	}
 
 	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
+
+	return ret;
 }
 
 static void gmbus_irq_handler(struct drm_device *dev)
@@ -688,7 +717,8 @@ static irqreturn_t valleyview_irq_handler(int irq, void *arg)
 			DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x\n",
 					 hotplug_status);
 			if (hotplug_trigger) {
-				hotplug_irq_storm_detect(dev, hotplug_trigger, hpd_status_i915);
+				if( hotplug_irq_storm_detect(dev, hotplug_trigger, hpd_status_i915))
+					i915_hpd_irq_setup(dev);
 				queue_work(dev_priv->wq,
 					   &dev_priv->hotplug_work);
 			}
@@ -718,7 +748,8 @@ static void ibx_irq_handler(struct drm_device *dev, u32 pch_iir)
 	u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK;
 
 	if (hotplug_trigger) {
-		hotplug_irq_storm_detect(dev, hotplug_trigger, hpd_ibx);
+		if (hotplug_irq_storm_detect(dev, hotplug_trigger, hpd_ibx))
+			ibx_hpd_irq_setup(dev);
 		queue_work(dev_priv->wq, &dev_priv->hotplug_work);
 	}
 	if (pch_iir & SDE_AUDIO_POWER_MASK)
@@ -766,7 +797,8 @@ static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
 	u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK_CPT;
 
 	if (hotplug_trigger) {
-		hotplug_irq_storm_detect(dev, hotplug_trigger, hpd_cpt);
+		if (hotplug_irq_storm_detect(dev, hotplug_trigger, hpd_cpt))
+			ibx_hpd_irq_setup(dev);
 		queue_work(dev_priv->wq, &dev_priv->hotplug_work);
 	}
 	if (pch_iir & SDE_AUDIO_POWER_MASK_CPT)
@@ -2043,12 +2075,14 @@ static void ibx_hpd_irq_setup(struct drm_device *dev)
 	if (HAS_PCH_IBX(dev)) {
 		mask &= ~SDE_HOTPLUG_MASK;
 		list_for_each_entry(intel_encoder, &mode_config->encoder_list, base.head)
-			mask |= hpd_ibx[intel_encoder->hpd_pin];
+			if (dev_priv->hpd_stats[intel_encoder->hpd_pin].hpd_mark == HPD_ENABLED)
+				mask |= hpd_ibx[intel_encoder->hpd_pin];
 		mask |= SDE_GMBUS | SDE_AUX_MASK;
 	} else {
 		mask &= ~SDE_HOTPLUG_MASK_CPT;
 		list_for_each_entry(intel_encoder, &mode_config->encoder_list, base.head)
-			mask |= hpd_cpt[intel_encoder->hpd_pin];
+			if (dev_priv->hpd_stats[intel_encoder->hpd_pin].hpd_mark == HPD_ENABLED)
+				mask |= hpd_cpt[intel_encoder->hpd_pin];
 		mask |= SDE_GMBUS_CPT | SDE_AUX_MASK_CPT;
 	}
 	I915_WRITE(SDEIIR, I915_READ(SDEIIR));
@@ -2514,7 +2548,8 @@ static irqreturn_t i915_irq_handler(int irq, void *arg)
 			DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x\n",
 				  hotplug_status);
 			if (hotplug_trigger) {
-				hotplug_irq_storm_detect(dev, hotplug_trigger, hpd_status_i915);
+				if (hotplug_irq_storm_detect(dev, hotplug_trigger, hpd_status_i915))
+					i915_hpd_irq_setup(dev);
 				queue_work(dev_priv->wq,
 					   &dev_priv->hotplug_work);
 			}
@@ -2668,7 +2703,7 @@ static void i915_hpd_irq_setup(struct drm_device *dev)
 {
 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 	struct drm_mode_config *mode_config = &dev->mode_config;
-	struct intel_encoder *encoder;
+	struct intel_encoder *intel_encoder;
 	u32 hotplug_en;
 
 	if (I915_HAS_HOTPLUG(dev)) {
@@ -2677,7 +2712,8 @@ static void i915_hpd_irq_setup(struct drm_device *dev)
 		/* Note HDMI and DP share hotplug bits */
 		/* enable bits are the same for all generations */
 		list_for_each_entry(intel_encoder, &mode_config->encoder_list, base.head)
-			hotplug_en |= hpd_mask_i915[intel_encoder->hpd_pin];
+			if (dev_priv->hpd_stats[intel_encoder->hpd_pin].hpd_mark == HPD_ENABLED)
+				hotplug_en |= hpd_mask_i915[intel_encoder->hpd_pin];
 		/* Programming the CRT detection parameters tends
 		   to generate a spurious hotplug event about three
 		   seconds later.  So just do it once.
@@ -2751,8 +2787,9 @@ static irqreturn_t i965_irq_handler(int irq, void *arg)
 			DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x\n",
 				  hotplug_status);
 			if (hotplug_trigger) {
-				hotplug_irq_storm_detect(dev, hotplug_trigger,
-							 IS_G4X(dev) ? hpd_status_gen4 : hpd_status_i965);
+				if (hotplug_irq_storm_detect(dev, hotplug_trigger,
+							    IS_G4X(dev) ? hpd_status_gen4 : hpd_status_i965))
+					i915_hpd_irq_setup(dev);
 				queue_work(dev_priv->wq,
 					   &dev_priv->hotplug_work);
 			}
-- 
1.7.7



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