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vc4/hdmi: Ignore hotplug interrupt with force_hotplug

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The intention of the vc4.force_hotplug setting is to
ignore hotplug completely.

It can be used when a display toggles hotplug when
switching AV inputs, going into standby or changing a
KVM switch, and some side effect of that is unwanted.

It turns out while vc4.force_hotplug currently makes
hotplug always read as asserted, that isn't enough to
stop drm doing lots of stuff, including re-reading
the edid.

An example of what drm does with a hotplug deasert/assert
and vc4.force_hotplug=1 currently is:

https://paste.debian.net/hidden/dc07434b/

That is unwanted. Lets ignore the hotplug interrupt
completely so drm is blissfully unaware of the hotplug change.

Signed-off-by: Dom Cobley <popcornmix@gmail.com>
This commit is contained in:
Dom Cobley
2024-04-23 17:30:56 +01:00
parent cde6070f60
commit ab0987fc15
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/vc4/vc4_hdmi.c
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@@ -2369,7 +2369,7 @@ static irqreturn_t vc4_hdmi_hpd_irq_thread(int irq, void *priv)
struct drm_connector *connector = &vc4_hdmi->connector;
struct drm_device *dev = connector->dev;
if (dev && dev->registered)
if (dev && dev->registered && !force_hotplug)
drm_connector_helper_hpd_irq_event(connector);
return IRQ_HANDLED;