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authorLekensteyn <lekensteyn@gmail.com>2012-06-26 00:36:24 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-03-28 12:12:28 -0700
commit2f7dea37d1b0b3a26fb3c2bd97bbf836dfd04def (patch)
parent5fb9149b0ee4c106fc73923a3751047bdb860993 (diff)
i915: initialize CADL in opregion
commit d627b62ff8d4d36761adbcd90ff143d79c94ab22 upstream. This is rather a hack to fix brightness hotkeys on a Clevo laptop. CADL is not used anywhere in the driver code at the moment, but it could be used in BIOS as is the case with the Clevo laptop. The Clevo B7130 requires the CADL field to contain at least the ID of the LCD device. If this field is empty, the ACPI methods that are called on pressing brightness / display switching hotkeys will not trigger a notification. As a result, it appears as no hotkey has been pressed. Reference: https://bugs.freedesktop.org/show_bug.cgi?id=45452 Tested-by: Peter Wu <lekensteyn@gmail.com> Signed-off-by: Peter Wu <lekensteyn@gmail.com> Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 files changed, 22 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c
index 289140bc83cb..cffb0071f877 100644
--- a/drivers/gpu/drm/i915/intel_opregion.c
+++ b/drivers/gpu/drm/i915/intel_opregion.c
@@ -419,6 +419,25 @@ blind_set:
goto end;
+static void intel_setup_cadls(struct drm_device *dev)
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct intel_opregion *opregion = &dev_priv->opregion;
+ int i = 0;
+ u32 disp_id;
+ /* Initialize the CADL field by duplicating the DIDL values.
+ * Technically, this is not always correct as display outputs may exist,
+ * but not active. This initialization is necessary for some Clevo
+ * laptops that check this field before processing the brightness and
+ * display switching hotkeys. Just like DIDL, CADL is NULL-terminated if
+ * there are less than eight devices. */
+ do {
+ disp_id = ioread32(&opregion->acpi->didl[i]);
+ iowrite32(disp_id, &opregion->acpi->cadl[i]);
+ } while (++i < 8 && disp_id != 0);
void intel_opregion_init(struct drm_device *dev)
struct drm_i915_private *dev_priv = dev->dev_private;
@@ -428,8 +447,10 @@ void intel_opregion_init(struct drm_device *dev)
if (opregion->acpi) {
- if (drm_core_check_feature(dev, DRIVER_MODESET))
+ if (drm_core_check_feature(dev, DRIVER_MODESET)) {
+ intel_setup_cadls(dev);
+ }
/* Notify BIOS we are ready to handle ACPI video ext notifs.
* Right now, all the events are handled by the ACPI video module.