[PATCH] drm/i915: don't double-restore ARB mode bits for kms

[Daniel Vetter <daniel.vetter@xxxxxxxx>]

Our init_clock_gating functions and related code should already take
care of this. And if they don't we'd better know.

Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
---
 drivers/gpu/drm/i915/i915_suspend.c | 26 +++++++++++++++-----------
 1 file changed, 15 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_suspend.c b/drivers/gpu/drm/i915/i915_suspend.c
index e6c90d1382b3..0b72fcd28d4d 100644
--- a/drivers/gpu/drm/i915/i915_suspend.c
+++ b/drivers/gpu/drm/i915/i915_suspend.c
@@ -348,12 +348,14 @@ int i915_save_state(struct drm_device *dev)
 
 	intel_disable_gt_powersave(dev);
 
-	/* Cache mode state */
-	if (INTEL_INFO(dev)->gen < 7)
-		dev_priv->regfile.saveCACHE_MODE_0 = I915_READ(CACHE_MODE_0);
+	if (!drm_core_check_feature(dev, DRIVER_MODESET)) {
+		/* Cache mode state */
+		if (INTEL_INFO(dev)->gen < 7)
+			dev_priv->regfile.saveCACHE_MODE_0 = I915_READ(CACHE_MODE_0);
 
-	/* Memory Arbitration state */
-	dev_priv->regfile.saveMI_ARB_STATE = I915_READ(MI_ARB_STATE);
+		/* Memory Arbitration state */
+		dev_priv->regfile.saveMI_ARB_STATE = I915_READ(MI_ARB_STATE);
+	}
 
 	/* Scratch space */
 	for (i = 0; i < 16; i++) {
@@ -394,13 +396,15 @@ int i915_restore_state(struct drm_device *dev)
 		}
 	}
 
-	/* Cache mode state */
-	if (INTEL_INFO(dev)->gen < 7)
-		I915_WRITE(CACHE_MODE_0, dev_priv->regfile.saveCACHE_MODE_0 |
-			   0xffff0000);
+	if (!drm_core_check_feature(dev, DRIVER_MODESET)) {
+		/* Cache mode state */
+		if (INTEL_INFO(dev)->gen < 7)
+			I915_WRITE(CACHE_MODE_0, dev_priv->regfile.saveCACHE_MODE_0 |
+				   0xffff0000);
 
-	/* Memory arbitration state */
-	I915_WRITE(MI_ARB_STATE, dev_priv->regfile.saveMI_ARB_STATE | 0xffff0000);
+		/* Memory arbitration state */
+		I915_WRITE(MI_ARB_STATE, dev_priv->regfile.saveMI_ARB_STATE | 0xffff0000);
+	}
 
 	for (i = 0; i < 16; i++) {
 		I915_WRITE(SWF00 + (i << 2), dev_priv->regfile.saveSWF0[i]);
-- 
1.8.5.2

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