drm/i915: Use ACPI OpRegion to determine lid status
Admittedly, trusting ACPI or the BIOS at all to be correct is littered
with numerous examples where it is wrong. Maybe, just maybe, we will
have better luck using the ACPI OpRegion lid status...
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index ace8d5d..fc6a0a9 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -472,8 +472,15 @@
intel_lvds_detect(struct drm_connector *connector, bool force)
{
struct drm_device *dev = connector->dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
enum drm_connector_status status = connector_status_connected;
+ /* Assume that the BIOS does not lie through the OpRegion... */
+ if (dev_priv->opregion.lid_state)
+ return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
+ connector_status_connected :
+ connector_status_disconnected;
+
/* ACPI lid methods were generally unreliable in this generation, so
* don't even bother.
*/