git.openwrt.org Git - openwrt/staging/ansuel.git/blob

   1 From 8d40b03821362d445a03dc23475fc4dff3ba88a7 Mon Sep 17 00:00:00 2001
   2 From: Dom Cobley <popcornmix@gmail.com>
   3 Date: Tue, 23 Apr 2024 17:30:56 +0100
   4 Subject: [PATCH 1049/1085] vc4/hdmi: Ignore hotplug interrupt with
   5  force_hotplug
   6
   7 The intention of the vc4.force_hotplug setting is to
   8 ignore hotplug completely.
   9
  10 It can be used when a display toggles hotplug when
  11 switching AV inputs, going into standby or changing a
  12 KVM switch, and some side effect of that is unwanted.
  13
  14 It turns out while vc4.force_hotplug currently makes
  15 hotplug always read as asserted, that isn't enough to
  16 stop drm doing lots of stuff, including re-reading
  17 the edid.
  18
  19 An example of what drm does with a hotplug deasert/assert
  20 and vc4.force_hotplug=1 currently is:
  21
  22 https://paste.debian.net/hidden/dc07434b/
  23
  24 That is unwanted. Lets ignore the hotplug interrupt
  25 completely so drm is blissfully unaware of the hotplug change.
  26
  27 Signed-off-by: Dom Cobley <popcornmix@gmail.com>
  28 ---
  29  drivers/gpu/drm/vc4/vc4_hdmi.c | 2 +-
  30  1 file changed, 1 insertion(+), 1 deletion(-)
  31
  32 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
  33 +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
  34 @@ -2917,7 +2917,7 @@ static irqreturn_t vc4_hdmi_hpd_irq_thre
  35         struct drm_connector *connector = &vc4_hdmi->connector;
  36         struct drm_device *dev = connector->dev;
  37
  38 -       if (dev && dev->registered)
  39 +       if (dev && dev->registered && !force_hotplug)
  40                 drm_connector_helper_hpd_irq_event(connector);
  41
  42         return IRQ_HANDLED;