[Intel-gfx] [PATCH 4/6] drm/i915: Kill RMW from ILK reset code

[ville.syrjala at linux.intel.com]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

All the other bits in the GDSR register are read-only, so we don't have
to preserve them when we perform a GPU reset.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_uncore.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index 008d30b..5c29cfe 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -993,22 +993,17 @@ static int i965_do_reset(struct drm_device *dev)
 static int ironlake_do_reset(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
-	u32 gdrst;
 	int ret;
 
-	gdrst = I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR);
-	gdrst &= ~ILK_GRDOM_MASK;
 	I915_WRITE(MCHBAR_MIRROR_BASE + ILK_GDSR,
-		   gdrst | ILK_GRDOM_RENDER | ILK_GRDOM_RESET_ENABLE);
+		   ILK_GRDOM_RENDER | ILK_GRDOM_RESET_ENABLE);
 	ret = wait_for((I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR) &
 			ILK_GRDOM_RESET_ENABLE) == 0, 500);
 	if (ret)
 		return ret;
 
-	gdrst = I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR);
-	gdrst &= ~ILK_GRDOM_MASK;
 	I915_WRITE(MCHBAR_MIRROR_BASE + ILK_GDSR,
-		   gdrst | ILK_GRDOM_MEDIA | ILK_GRDOM_RESET_ENABLE);
+		   ILK_GRDOM_MEDIA | ILK_GRDOM_RESET_ENABLE);
 	return wait_for((I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR) &
 			 ILK_GRDOM_RESET_ENABLE) == 0, 500);
 }
-- 
1.8.5.5