[Intel-gfx] [PATCH 3/3] drm/i915: Disable pwrctx before unpin and free

[Kristian Høgsberg]

Otherwise the chip may scribble over free memory.

Signed-off-by: Kristian Høgsberg <krh at bitplanet.net>
Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
---
 drivers/gpu/drm/i915/intel_display.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index c25a8e2..3b4c65f 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4554,6 +4554,11 @@ void intel_modeset_cleanup(struct drm_device *dev)
 		dev_priv->display.disable_fbc(dev);
 
 	if (dev_priv->pwrctx) {
+		struct drm_i915_gem_object *obj_priv;
+
+		obj_priv = dev_priv->pwrctx->driver_private;
+		I915_WRITE(PWRCTXA, obj_priv->gtt_offset &~ PWRCTX_EN);
+		I915_READ(PWRCTXA);
 		i915_gem_object_unpin(dev_priv->pwrctx);
 		drm_gem_object_unreference(dev_priv->pwrctx);
 	}
-- 
1.6.5.rc2