You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
42 lines
1.6 KiB
42 lines
1.6 KiB
From 05352a2959d8924a6333726cd15144245d7c98fa Mon Sep 17 00:00:00 2001
|
|
From: Eric Anholt <eric@anholt.net>
|
|
Date: Fri, 12 Aug 2016 10:57:41 -0700
|
|
Subject: [PATCH] drm/vc4: Replace HDMI force-connected with an EDID probe.
|
|
|
|
The force-connected started out because I didn't know how to read the
|
|
HPD pin successfully, which required the hpd_active_low check and
|
|
getting the correct active level into the DTs. It stayed because we
|
|
don't have the Pi3's HPD line exposed to Linux, so this was the only
|
|
way to bring up graphics on it.
|
|
|
|
However, with the DSI panel support now present, users want to be able
|
|
to run DSI-only systems, and forcing HDMI on is interfering with
|
|
default screen configurations. Work around the Pi3's missing HPD by
|
|
probing the DDC on I2C and see if it's present at all.
|
|
|
|
Signed-off-by: Eric Anholt <eric@anholt.net>
|
|
---
|
|
drivers/gpu/drm/vc4/vc4_hdmi.c | 5 +++--
|
|
1 file changed, 3 insertions(+), 2 deletions(-)
|
|
|
|
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
|
|
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
|
|
@@ -166,8 +166,6 @@ vc4_hdmi_connector_detect(struct drm_con
|
|
struct drm_device *dev = connector->dev;
|
|
struct vc4_dev *vc4 = to_vc4_dev(dev);
|
|
|
|
- return connector_status_connected;
|
|
-
|
|
if (vc4->hdmi->hpd_gpio) {
|
|
if (gpio_get_value_cansleep(vc4->hdmi->hpd_gpio) ^
|
|
vc4->hdmi->hpd_active_low)
|
|
@@ -176,6 +174,9 @@ vc4_hdmi_connector_detect(struct drm_con
|
|
return connector_status_disconnected;
|
|
}
|
|
|
|
+ if (drm_probe_ddc(vc4->hdmi->ddc))
|
|
+ return connector_status_connected;
|
|
+
|
|
if (HDMI_READ(VC4_HDMI_HOTPLUG) & VC4_HDMI_HOTPLUG_CONNECTED)
|
|
return connector_status_connected;
|
|
else
|
|
|