drm/i915: use ACPI LID status for LVDS ->detect hook
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>
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index e190ff7..90f69d4 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -589,12 +589,18 @@
/**
* 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;
}
/**