drm/i915: Add support for fence registers on Ivybridge.

The registers are the same as on Sandybridge.  Fixes scrambled display
in X when it does software drawing to the GTT, and scans the results
out as tiled.

Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 4304f74dfb5f..c6289034e29a 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2673,6 +2673,7 @@ i915_gem_object_get_fence(struct drm_i915_gem_object *obj,
 update:
         obj->tiling_changed = false;
         switch (INTEL_INFO(dev)->gen) {
+        case 7:
         case 6:
                 ret = sandybridge_write_fence_reg(obj, pipelined);
                 break;
@@ -2706,6 +2707,7 @@ i915_gem_clear_fence_reg(struct drm_device *dev,
         uint32_t fence_reg = reg - dev_priv->fence_regs;
 
         switch (INTEL_INFO(dev)->gen) {
+        case 7:
         case 6:
                 I915_WRITE64(FENCE_REG_SANDYBRIDGE_0 + fence_reg*8, 0);
                 break;