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drm/i915: use ACPI LID status for LVDS ->detect hook

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We can't load or hotplug detect LVDS like we can other outputs, but if
there's a lid device present we can use it as a proxy.  This allows the
LFP state to be determined at ->detect time, making configurations
requiring manual intervention today "just work" assuming the lid device
status is correct.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Jesse Barnes 2009-09-10 15:28:04 -07:00 committed by Eric Anholt
parent c1c7af6089
commit b42d4c5c6a
1 changed files with 9 additions and 3 deletions
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12
drivers/gpu/drm/i915/intel_lvds.c
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@ -589,12 +589,18 @@ static void intel_lvds_mode_set(struct drm_encoder *encoder,
/**
* Detect the LVDS connection.
*
* This always returns CONNECTOR_STATUS_CONNECTED. This connector should only have
* been set up if the LVDS was actually connected anyway.
* Since LVDS doesn't have hotlug, we use the lid as a proxy. Open means
* connected and closed means disconnected. We also send hotplug events as
* needed, using lid status notification from the input layer.
*/
static enum drm_connector_status intel_lvds_detect(struct drm_connector *connector)
{
return connector_status_connected;
enum drm_connector_status status = connector_status_connected;
if (!acpi_lid_open())
status = connector_status_disconnected;
return status;
}
/**