Add Intel ACPI IGD OpRegion support

This adds the support necessary for allowing ACPI backlight control to
work on some newer Intel-based graphics systems. Tested on Thinkpad T61
and HP 2510p hardware.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index f1b5aa92fa83..29115450ee46 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -810,6 +810,8 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
         if (!IS_I945G(dev) && !IS_I945GM(dev))
                 pci_enable_msi(dev->pdev);
 
+        intel_opregion_init(dev);
+
         spin_lock_init(&dev_priv->user_irq_lock);
 
         return ret;
@@ -827,6 +829,8 @@ int i915_driver_unload(struct drm_device *dev)
         if (dev_priv->mmio_map)
                 drm_rmmap(dev, dev_priv->mmio_map);
 
+        intel_opregion_free(dev);
+
         drm_free(dev->dev_private, sizeof(drm_i915_private_t),
                  DRM_MEM_DRIVER);