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drm/vc4: Fall back to using an EDID probe in the absence of a GPIO.

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On Pi0/1/2, we use an external GPIO line for hotplug detection, since
the HDMI_HOTPLUG register isn't connected to anything.  However, with
the Pi3 the HPD GPIO line has moved off to a GPIO expander that will
be tricky to get to (the firmware is constantly polling the expander
using i2c0, so we'll need to coordinate with it).

As a stop-gap, if we don't have a GPIO line, use an EDID probe to
detect connection.  Fixes HDMI display on the pi3.

Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Eric Anholt 2016-09-14 19:21:29 +01:00
parent 6e1cbbad67
commit 9d44abbbb8
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/vc4/vc4_hdmi.c
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@ -174,6 +174,9 @@ vc4_hdmi_connector_detect(struct drm_connector *connector, bool force)
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