drm/i915: fix ILK GPU reset for render

Earlier code would leave both bits set, so any reset after the first
would only reset media.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

2 files changed, 3 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 0cfc778aa759..1c53438cea47 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -744,6 +744,7 @@ static int ironlake_do_reset(struct drm_device *dev)
         int ret;
 
         gdrst = I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR);
+        gdrst &= ~GRDOM_MASK;
         I915_WRITE(MCHBAR_MIRROR_BASE + ILK_GDSR,
                    gdrst | GRDOM_RENDER | GRDOM_RESET_ENABLE);
         ret = wait_for(I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR) & 0x1, 500);
@@ -752,6 +753,7 @@ static int ironlake_do_reset(struct drm_device *dev)
 
         /* We can't reset render&media without also resetting display ... */
         gdrst = I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR);
+        gdrst &= ~GRDOM_MASK;
         I915_WRITE(MCHBAR_MIRROR_BASE + ILK_GDSR,
                    gdrst | GRDOM_MEDIA | GRDOM_RESET_ENABLE);
         return wait_for(I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR) & 0x1, 500);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 5e91fbbedcef..95ad87c2981d 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -91,6 +91,7 @@
 #define  GRDOM_FULL     (0<<2)
 #define  GRDOM_RENDER   (1<<2)
 #define  GRDOM_MEDIA    (3<<2)
+#define  GRDOM_MASK     (3<<2)
 #define  GRDOM_RESET_ENABLE (1<<0)
 
 #define GEN6_MBCUNIT_SNPCR      0x900c /* for LLC config */