[PATCH 2/4] drm/i915: save/restore DSPARB only for chips before gen4 but not for G33

[Zhenyu Wang <zhenyuw@linux.intel.com>]

DSPARB is reserved on G33 and not available on Gen6.

Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_suspend.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_suspend.c b/drivers/gpu/drm/i915/i915_suspend.c
index 0521ecf..8d165c4 100644
--- a/drivers/gpu/drm/i915/i915_suspend.c
+++ b/drivers/gpu/drm/i915/i915_suspend.c
@@ -603,7 +603,8 @@ void i915_save_display(struct drm_device *dev)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
 	/* Display arbitration control */
-	dev_priv->saveDSPARB = I915_READ(DSPARB);
+	if (dev_priv->info->gen < 4 && !IS_G33(dev))
+		dev_priv->saveDSPARB = I915_READ(DSPARB);
 
 	/* This is only meaningful in non-KMS mode */
 	/* Don't save them in KMS mode */
@@ -695,7 +696,8 @@ void i915_restore_display(struct drm_device *dev)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
 	/* Display arbitration */
-	I915_WRITE(DSPARB, dev_priv->saveDSPARB);
+	if (dev_priv->info->gen < 4 && !IS_G33(dev))
+		I915_WRITE(DSPARB, dev_priv->saveDSPARB);
 
 	/* Display port ratios (must be done before clock is set) */
 	if (SUPPORTS_INTEGRATED_DP(dev)) {
-- 
1.7.4.1