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drm/i915/hpd: Let an HPD pin be in the disabled state when handling missed IRQs

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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 blocking 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
unblocking the IRQ handling (since the blocking could've happened for an
already disabled pin). Adjust queue_work_for_missed_irqs() accordingly,
so that this function can be reused for unblocking the IRQ handling.

Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250304152917.3407080-3-imre.deak@intel.com
This commit is contained in:
Imre Deak 2025-03-04 17:29:13 +02:00
parent 9f1e253d78
commit 4b16619608
1 changed files with 1 additions and 0 deletions
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1
drivers/gpu/drm/i915/display/intel_hotplug.c
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@ -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: