drm/i915: Add frame buffer compression on Sandybridge

Add frame buffer compression on Sandybridge. The method is similar to
Ironlake, except that two new registers of type GTTMMADR must be written
with the right fence info.

Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 61ef98db9ff0..820e9dfaadc7 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -600,6 +600,16 @@
 
 
 /*
+ * Framebuffer compression for Sandybridge
+ *
+ * The following two registers are of type GTTMMADR
+ */
+#define SNB_DPFC_CTL_SA         0x100100
+#define   SNB_CPU_FENCE_ENABLE  (1<<29)
+#define DPFC_CPU_FENCE_OFFSET   0x100104
+
+
+/*
  * GPIO regs
  */
 #define GPIOA                   0x5010