[PATCH v3 4/5] drm/i915: Clarify flow for disabling IRQs on storms

[Lyude Paul]

This is rather confusing to look at as-is:
dev_priv->display.hpd_irq_setup(dev_priv); in intel_hpd_irq_handler()
handles disabling the actual HPD IRQ, while
intel_hpd_irq_storm_disable() handles moving the HPD pin state over from
MARK_DISABLED to DISABLED along with enabling polling for it.

Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: Lyude Paul <lyude at redhat.com>
---
 drivers/gpu/drm/i915/intel_hotplug.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_hotplug.c b/drivers/gpu/drm/i915/intel_hotplug.c
index c11d73de16f2..e5e3eeb7e482 100644
--- a/drivers/gpu/drm/i915/intel_hotplug.c
+++ b/drivers/gpu/drm/i915/intel_hotplug.c
@@ -351,7 +351,7 @@ static void i915_hotplug_work_func(struct work_struct *work)
 	hpd_event_bits = dev_priv->hotplug.event_bits;
 	dev_priv->hotplug.event_bits = 0;
 
-	/* Disable hotplug on connectors that hit an irq storm. */
+	/* Enable polling for connectors which had HPD IRQ storms */
 	intel_hpd_irq_storm_disable(dev_priv);
 
 	spin_unlock_irq(&dev_priv->irq_lock);
@@ -458,6 +458,10 @@ void intel_hpd_irq_handler(struct drm_i915_private *dev_priv,
 		}
 	}
 
+	/*
+	 * Disable any IRQs that storms were detected on. Polling enablement
+	 * happens later in our hotplug work.
+	 */
 	if (storm_detected && dev_priv->display_irqs_enabled)
 		dev_priv->display.hpd_irq_setup(dev_priv);
 	spin_unlock(&dev_priv->irq_lock);
-- 
2.19.1