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41 lines
1.4 KiB
Diff
41 lines
1.4 KiB
Diff
From 23174f1a02ea5b05d11aaf339d3ce7b4fd4aef3b Mon Sep 17 00:00:00 2001
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From: Dom Cobley <popcornmix@gmail.com>
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Date: Tue, 23 Apr 2024 17:30:56 +0100
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Subject: [PATCH 650/697] vc4/hdmi: Ignore hotplug interrupt with force_hotplug
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The intention of the vc4.force_hotplug setting is to
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ignore hotplug completely.
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It can be used when a display toggles hotplug when
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switching AV inputs, going into standby or changing a
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KVM switch, and some side effect of that is unwanted.
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It turns out while vc4.force_hotplug currently makes
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hotplug always read as asserted, that isn't enough to
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stop drm doing lots of stuff, including re-reading
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the edid.
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An example of what drm does with a hotplug deasert/assert
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and vc4.force_hotplug=1 currently is:
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https://paste.debian.net/hidden/dc07434b/
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That is unwanted. Lets ignore the hotplug interrupt
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completely so drm is blissfully unaware of the hotplug change.
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Signed-off-by: Dom Cobley <popcornmix@gmail.com>
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---
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drivers/gpu/drm/vc4/vc4_hdmi.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
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+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
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@@ -2476,7 +2476,7 @@ static irqreturn_t vc4_hdmi_hpd_irq_thre
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struct drm_connector *connector = &vc4_hdmi->connector;
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struct drm_device *dev = connector->dev;
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- if (dev && dev->registered)
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+ if (dev && dev->registered && !force_hotplug)
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drm_connector_helper_hpd_irq_event(connector);
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return IRQ_HANDLED;
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