[Intel-gfx] [PATCH 5/8] drm/i915: save/restore MI_ARB_STATE only for gen3

[Zhenyu Wang]

Signed-off-by: Zhenyu Wang <zhenyuw at 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 11e61a3..26387c3 100644
--- a/drivers/gpu/drm/i915/i915_suspend.c
+++ b/drivers/gpu/drm/i915/i915_suspend.c
@@ -820,7 +820,8 @@ int i915_save_state(struct drm_device *dev)
 		gen6_disable_rps(dev);
 
 	/* Memory Arbitration state */
-	dev_priv->saveMI_ARB_STATE = I915_READ(MI_ARB_STATE);
+	if (IS_GEN3(dev))
+		dev_priv->saveMI_ARB_STATE = I915_READ(MI_ARB_STATE);
 
 	/* Scratch space */
 	for (i = 0; i < 16; i++) {
@@ -865,7 +866,8 @@ int i915_restore_state(struct drm_device *dev)
 		gen6_enable_rps(dev_priv);
 
 	/* Memory arbitration state */
-	I915_WRITE (MI_ARB_STATE, dev_priv->saveMI_ARB_STATE | 0xffff0000);
+	if (IS_GEN3(dev))
+		I915_WRITE (MI_ARB_STATE, dev_priv->saveMI_ARB_STATE | 0xffff0000);
 
 	for (i = 0; i < 16; i++) {
 		I915_WRITE(SWF00 + (i << 2), dev_priv->saveSWF0[i]);
-- 
1.7.4.1