[Mesa-dev] [PATCH 4/5] iris: disable repacking for compression for applicable gen

[Dongwon Kim]

set bit15 (Disable Rebacking for Compression) of CACHE_MODE_0 register
if the gen attribute, 'disable_ccs_repack' is set.

Signed-off-by: Dongwon Kim <dongwon.kim at intel.com>
---
 src/gallium/drivers/iris/iris_state.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/gallium/drivers/iris/iris_state.c b/src/gallium/drivers/iris/iris_state.c
index bf31f31f3e4..ce25f1ffcb3 100644
--- a/src/gallium/drivers/iris/iris_state.c
+++ b/src/gallium/drivers/iris/iris_state.c
@@ -755,6 +755,16 @@ iris_init_render_context(struct iris_screen *screen,
       }
       iris_emit_lri(batch, SLICE_COMMON_ECO_CHICKEN1, reg_val);
 
+      /* hardware specification recommends disabling repacking for
+       * the compatibility with decompression mechanism in display controller.
+       */
+      if (devinfo->disable_ccs_repack) {
+         iris_pack_state(GENX(CACHE_MODE_0), &reg_val, reg) {
+            reg.DisableRepackingforCompression = true;
+            reg.DisableRepackingforCompressionMask = true;
+         }
+         iris_emit_lri(batch, CACHE_MODE_0, reg_val);
+      }
 
       // XXX: 3D_MODE?
 #endif
-- 
2.17.1