[PATCH 1/5] drm/i915/hpd: Let an HPD pin be in the disabled state when handling missed IRQs

[Imre Deak <imre.deak@intel.com>]

After suspending and resuming the detection on connectors, HPD IRQs that
arrived while the detection was suspended, are handled by scheduling the
intel_hotplug::hotplug work for them. All HPD pins must be at this point
in either the HPD_ENABLED (set for all pins during driver loading/system
resuming) or HPD_MARK_DISABLED (set by IRQ storm detection) state: the
HPD_DISABLED state for a pin can be set only from the HPD_MARK_DISABLED
state by the hotplug work after a storm detection (enabling polling on
the given pin/connector), however the hotplug work won't be scheduled
while the detection is suspended.

A follow-up change will add support for suspending the HPD IRQ handling
on a given HPD pin (without disabling the IRQ generation on it), after
which it becomes possible to see a pin in the HPD_DISABLED state when
resuming the IRQ handling (since the suspending could've happened for an
already disabled pin). Adjust queue_work_for_missed_irqs() accordingly,
so that this function can be reused for resuming the IRQ handling.

Signed-off-by: Imre Deak <imre.deak@intel.com>
---
 drivers/gpu/drm/i915/display/intel_hotplug.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/i915/display/intel_hotplug.c b/drivers/gpu/drm/i915/display/intel_hotplug.c
index 00d7b1ccf1900..ab8e71c4b0f86 100644
--- a/drivers/gpu/drm/i915/display/intel_hotplug.c
+++ b/drivers/gpu/drm/i915/display/intel_hotplug.c
@@ -980,6 +980,7 @@ static void queue_work_for_missed_irqs(struct drm_i915_private *i915)
 		case HPD_MARK_DISABLED:
 			queue_work = true;
 			break;
+		case HPD_DISABLED:
 		case HPD_ENABLED:
 			break;
 		default:
-- 
2.44.2