drm/i915: Mask reserved bits in display/sprite address registers

The purpose of this patch is to avoid zeroing the lower 12 reserved bits
of surface base address registers (framebuffer & sprite).  There are bits
in that range that may occasionally be set by BIOS or by other components.

Signed-off-by: Armin Reese <armin.c.reese@intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
index 987800a0234f..fbf03b996587 100644
--- a/drivers/gpu/drm/i915/intel_sprite.c
+++ b/drivers/gpu/drm/i915/intel_sprite.c
@@ -133,7 +133,7 @@ ivb_update_plane(struct drm_plane *plane, struct drm_framebuffer *fb,
         I915_WRITE(SPRSIZE(pipe), (crtc_h << 16) | crtc_w);
         I915_WRITE(SPRSCALE(pipe), sprscale);
         I915_WRITE(SPRCTL(pipe), sprctl);
-        I915_WRITE(SPRSURF(pipe), obj->gtt_offset);
+        I915_MODIFY_DISPBASE(SPRSURF(pipe), obj->gtt_offset);
         POSTING_READ(SPRSURF(pipe));
 }
 
@@ -149,7 +149,7 @@ ivb_disable_plane(struct drm_plane *plane)
         /* Can't leave the scaler enabled... */
         I915_WRITE(SPRSCALE(pipe), 0);
         /* Activate double buffered register update */
-        I915_WRITE(SPRSURF(pipe), 0);
+        I915_MODIFY_DISPBASE(SPRSURF(pipe), 0);
         POSTING_READ(SPRSURF(pipe));
 }
 
@@ -291,7 +291,7 @@ ilk_update_plane(struct drm_plane *plane, struct drm_framebuffer *fb,
         I915_WRITE(DVSSIZE(pipe), (crtc_h << 16) | crtc_w);
         I915_WRITE(DVSSCALE(pipe), dvsscale);
         I915_WRITE(DVSCNTR(pipe), dvscntr);
-        I915_WRITE(DVSSURF(pipe), obj->gtt_offset);
+        I915_MODIFY_DISPBASE(DVSSURF(pipe), obj->gtt_offset);
         POSTING_READ(DVSSURF(pipe));
 }
 
@@ -307,7 +307,7 @@ ilk_disable_plane(struct drm_plane *plane)
         /* Disable the scaler */
         I915_WRITE(DVSSCALE(pipe), 0);
         /* Flush double buffered register updates */
-        I915_WRITE(DVSSURF(pipe), 0);
+        I915_MODIFY_DISPBASE(DVSSURF(pipe), 0);
         POSTING_READ(DVSSURF(pipe));
 }