drm/i915: Add ACPI OpRegion support for Ironlake
Add the support of ACPI opregion on Ironlake so that the backlight
brightness can be adjusted by using ACPI interface
>/sys/class/backlight/acpi_video0/brightness
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Tested-by: Zhao Yakui <yakui.zhao@intel.com>
[zhenyuw: cleanups, fix typo for checking GSE irq and convert to
current irq handling logic.]
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 0887581..ce337be 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -157,6 +157,20 @@
}
/**
+ * intel_enable_asle - enable ASLE interrupt for OpRegion
+ */
+void intel_enable_asle (struct drm_device *dev)
+{
+ drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
+
+ if (IS_IGDNG(dev))
+ igdng_enable_display_irq(dev_priv, DE_GSE);
+ else
+ i915_enable_pipestat(dev_priv, 1,
+ I915_LEGACY_BLC_EVENT_ENABLE);
+}
+
+/**
* i915_pipe_enabled - check if a pipe is enabled
* @dev: DRM device
* @pipe: pipe to check
@@ -288,6 +302,9 @@
DRM_WAKEUP(&dev_priv->irq_queue);
}
+ if (de_iir & DE_GSE)
+ ironlake_opregion_gse_intr(dev);
+
de_iir = new_de_iir;
gt_iir = new_gt_iir;
}
@@ -992,7 +1009,7 @@
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
/* enable kind of interrupts always enabled */
- u32 display_mask = DE_MASTER_IRQ_CONTROL /*| DE_PCH_EVENT */;
+ u32 display_mask = DE_MASTER_IRQ_CONTROL | DE_GSE /*| DE_PCH_EVENT */;
u32 render_mask = GT_USER_INTERRUPT;
dev_priv->irq_mask_reg = ~display_mask;