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