65 lines
2.3 KiB
Diff
65 lines
2.3 KiB
Diff
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From 38c1a19fb78da8c2a617b1d8a3fcafb691c1409f Mon Sep 17 00:00:00 2001
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From: Chris Wilson <chris@chris-wilson.co.uk>
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Date: Sun, 16 Jan 2011 19:37:30 +0000
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Subject: [PATCH 1/3] drm/i915: Use ACPI OpRegion to determine lid status
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Admittedly, trusting ACPI or the BIOS at all to be correct is littered
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with numerous examples where it is wrong. Maybe, just maybe, we will
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have better luck using the ACPI OpRegion lid status...
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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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---
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drivers/gpu/drm/i915/i915_drv.h | 1 +
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drivers/gpu/drm/i915/intel_lvds.c | 7 +++++++
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drivers/gpu/drm/i915/intel_opregion.c | 2 ++
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3 files changed, 10 insertions(+), 0 deletions(-)
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diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
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index 456f404..a299cc6 100644
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--- a/drivers/gpu/drm/i915/i915_drv.h
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+++ b/drivers/gpu/drm/i915/i915_drv.h
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@@ -111,6 +111,7 @@ struct intel_opregion {
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struct opregion_swsci *swsci;
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struct opregion_asle *asle;
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void *vbt;
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+ u32 __iomem *lid_state;
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};
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#define OPREGION_SIZE (8*1024)
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diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
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index bcdba7b..aa29228 100644
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--- a/drivers/gpu/drm/i915/intel_lvds.c
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+++ b/drivers/gpu/drm/i915/intel_lvds.c
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@@ -472,8 +472,15 @@ static enum drm_connector_status
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intel_lvds_detect(struct drm_connector *connector, bool force)
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{
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struct drm_device *dev = connector->dev;
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+ struct drm_i915_private *dev_priv = dev->dev_private;
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enum drm_connector_status status = connector_status_connected;
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+ /* Assume that the BIOS does not lie through the OpRegion... */
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+ if (dev_priv->opregion.lid_state)
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+ return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
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+ connector_status_connected :
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+ connector_status_disconnected;
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+
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/* ACPI lid methods were generally unreliable in this generation, so
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* don't even bother.
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*/
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diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c
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index 64fd644..9efccb9 100644
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--- a/drivers/gpu/drm/i915/intel_opregion.c
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+++ b/drivers/gpu/drm/i915/intel_opregion.c
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@@ -489,6 +489,8 @@ int intel_opregion_setup(struct drm_device *dev)
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opregion->header = base;
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opregion->vbt = base + OPREGION_VBT_OFFSET;
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+ opregion->lid_state = base + 0x01ac;
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+
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mboxes = opregion->header->mboxes;
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if (mboxes & MBOX_ACPI) {
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DRM_DEBUG_DRIVER("Public ACPI methods supported\n");
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--
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1.7.6.5
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