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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>
This commit is contained in:
Chris Wilson 2011-01-16 19:37:30 +00:00
parent c56eb8fb6d
commit 01fe9dbde1
3 changed files with 10 additions and 0 deletions
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1
drivers/gpu/drm/i915/i915_drv.h
View File

@ -111,6 +111,7 @@ struct intel_opregion {
struct opregion_swsci *swsci;
struct opregion_asle *asle;
void *vbt;
u32 __iomem *lid_state;
};
#define OPREGION_SIZE (8*1024)

7
drivers/gpu/drm/i915/intel_lvds.c
View File

@ -472,8 +472,15 @@ static enum drm_connector_status
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.
*/

2
drivers/gpu/drm/i915/intel_opregion.c
View File

@ -488,6 +488,8 @@ int intel_opregion_setup(struct drm_device *dev)
opregion->header = base;
opregion->vbt = base + OPREGION_VBT_OFFSET;
opregion->lid_state = base + 0x01ac;
mboxes = opregion->header->mboxes;
if (mboxes & MBOX_ACPI) {
DRM_DEBUG_DRIVER("Public ACPI methods supported\n");