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65 lines
2.7 KiB
Diff
65 lines
2.7 KiB
Diff
From 9219926b71a1c16eb77ef9d96b14913b7f03757d Mon Sep 17 00:00:00 2001
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From: Maxime Ripard <maxime@cerno.tech>
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Date: Thu, 19 Aug 2021 13:50:12 +0200
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Subject: [PATCH 032/634] drm/vc4: hdmi: Actually check for the connector
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status in hotplug
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The drm_helper_hpd_irq_event() documentation states that this function
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is "useful for drivers which can't or don't track hotplug interrupts for
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each connector." and that "Drivers which support hotplug interrupts for
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each connector individually and which have a more fine-grained detect
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logic should bypass this code and directly call
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drm_kms_helper_hotplug_event()". This is thus what we ended-up doing.
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However, what this actually means, and is further explained in the
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drm_kms_helper_hotplug_event() documentation, is that
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drm_kms_helper_hotplug_event() should be called by drivers that can
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track the connection status change, and if it has changed we should call
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that function.
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This underlying expectation we failed to provide is that the caller of
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drm_kms_helper_hotplug_event() should call drm_helper_probe_detect() to
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probe the new status of the connector.
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Since we didn't do it, it meant that even though we were sending the
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notification to user-space and the DRM clients that something changed we
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never probed or updated our internal connector status ourselves.
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This went mostly unnoticed since the detect callback usually doesn't
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have any side-effect. Also, if we were using the DRM fbdev emulation
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(which is a DRM client), or any user-space application that can deal
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with hotplug events, chances are they would react to the hotplug event
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by probing the connector status eventually.
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However, now that we have to enable the scrambler in detect() if it was
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enabled it has a side effect, and an application such as Kodi or
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modetest doesn't deal with hotplug events. This resulted with a black
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screen when Kodi or modetest was running when a screen was disconnected
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and then reconnected, or switched off and on.
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Signed-off-by: Maxime Ripard <maxime@cerno.tech>
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---
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drivers/gpu/drm/vc4/vc4_hdmi.c | 5 +++--
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1 file changed, 3 insertions(+), 2 deletions(-)
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diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
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index 87870775471d..053fbaf765ca 100644
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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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@@ -1783,10 +1783,11 @@ static int vc4_hdmi_audio_init(struct vc4_hdmi *vc4_hdmi)
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static irqreturn_t vc4_hdmi_hpd_irq_thread(int irq, void *priv)
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{
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struct vc4_hdmi *vc4_hdmi = priv;
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- struct drm_device *dev = vc4_hdmi->connector.dev;
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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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- drm_kms_helper_hotplug_event(dev);
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+ drm_connector_helper_hpd_irq_event(connector);
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return IRQ_HANDLED;
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}
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--
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2.33.1
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