For HPD storm detection we now mask out individual interrupt source
bits. We have already seen a case where HPD interrupt enable bits
were assigned to the wrong pins. To track these conditions more
easily add some debugging messages.
Signed-off-by: Egbert Eich <eich@xxxxxxx>
---
drivers/gpu/drm/i915/i915_irq.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index ee3e49c..1f3a971 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -919,6 +919,10 @@ static inline void intel_hpd_irq_handler(struct drm_device *dev,
spin_lock(&dev_priv->irq_lock);
for (i = 1; i < HPD_NUM_PINS; i++) {
+ WARN(((hpd[i] & hotplug_trigger) &&
+ dev_priv->hpd_stats[i].hpd_mark != HPD_ENABLED),
+ "Received HPD intterupt although disabled\n");
+
if (!(hpd[i] & hotplug_trigger) ||
dev_priv->hpd_stats[i].hpd_mark != HPD_ENABLED)
continue;
@@ -929,6 +933,7 @@ static inline void intel_hpd_irq_handler(struct drm_device *dev,
+ msecs_to_jiffies(HPD_STORM_DETECT_PERIOD))) {
dev_priv->hpd_stats[i].hpd_last_jiffies = jiffies;
dev_priv->hpd_stats[i].hpd_cnt = 0;
+ DRM_DEBUG_KMS("Received HPD interrupt on PIN %d - cnt: 0\n", i);
} else if (dev_priv->hpd_stats[i].hpd_cnt > HPD_STORM_THRESHOLD) {
dev_priv->hpd_stats[i].hpd_mark = HPD_MARK_DISABLED;
dev_priv->hpd_event_bits &= ~(1 << i);
@@ -936,6 +941,8 @@ static inline void intel_hpd_irq_handler(struct drm_device *dev,
storm_detected = true;
} else {
dev_priv->hpd_stats[i].hpd_cnt++;
+ DRM_DEBUG_KMS("Received HPD interrupt on PIN %d - cnt: %d\n", i,
+ dev_priv->hpd_stats[i].hpd_cnt);
}
}
--
1.8.1.4
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