[Intel-gfx] [PATCH 3/4] drm/i915: Fix legacy BLC event for pipe A

[Zhenyu Wang]

From: Zhao Yakui <yakui.zhao at intel.com>

OpRegion event on 965G requires legacy BLC event enabled in pipe stat. As LVDS
could be on either pipe now, we should enable BLC event on both pipe. If fail to
do so, we couldn't handle the brightness request triggered from graphics
opregion.

Signed-off-by: Zhao Yakui <yakui.zhao at intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 5b53adf..59b6433 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -168,9 +168,13 @@ void intel_enable_asle (struct drm_device *dev)
 
 	if (HAS_PCH_SPLIT(dev))
 		ironlake_enable_display_irq(dev_priv, DE_GSE);
-	else
+	else {
 		i915_enable_pipestat(dev_priv, 1,
 				     I915_LEGACY_BLC_EVENT_ENABLE);
+		if (IS_I965G(dev))
+			i915_enable_pipestat(dev_priv, 0,
+					     I915_LEGACY_BLC_EVENT_ENABLE);
+	}
 }
 
 /**
@@ -945,7 +949,8 @@ irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
 			intel_finish_page_flip(dev, 1);
 		}
 
-		if ((pipeb_stats & I915_LEGACY_BLC_EVENT_STATUS) ||
+		if ((pipea_stats & I915_LEGACY_BLC_EVENT_STATUS) ||
+		    (pipeb_stats & I915_LEGACY_BLC_EVENT_STATUS) ||
 		    (iir & I915_ASLE_INTERRUPT))
 			opregion_asle_intr(dev);
 
-- 
1.6.3.3