[Mesa-dev] [PATCH 3/5] i965: 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/mesa/drivers/dri/i965/brw_defines.h      | 1 +
 src/mesa/drivers/dri/i965/brw_state_upload.c | 9 +++++++++
 2 files changed, 10 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_defines.h b/src/mesa/drivers/dri/i965/brw_defines.h
index 17bca1991f1..e8507b7e5ff 100644
--- a/src/mesa/drivers/dri/i965/brw_defines.h
+++ b/src/mesa/drivers/dri/i965/brw_defines.h
@@ -1576,6 +1576,7 @@ enum brw_pixel_shader_coverage_mask_mode {
 # define GEN9_PARTIAL_RESOLVE_DISABLE_IN_VC (1 << 1)
 # define GEN8_HIZ_PMA_MASK_BITS \
    REG_MASK(GEN8_HIZ_NP_PMA_FIX_ENABLE | GEN8_HIZ_NP_EARLY_Z_FAILS_DISABLE)
+# define GEN11_DISABLE_REPACKING_FOR_COMPRESSION (1 << 15)
 
 #define GEN7_GT_MODE                    0x7008
 # define GEN9_SUBSLICE_HASHING_8x8      (0 << 8)
diff --git a/src/mesa/drivers/dri/i965/brw_state_upload.c b/src/mesa/drivers/dri/i965/brw_state_upload.c
index 938b9defeda..09303600308 100644
--- a/src/mesa/drivers/dri/i965/brw_state_upload.c
+++ b/src/mesa/drivers/dri/i965/brw_state_upload.c
@@ -121,6 +121,15 @@ brw_upload_initial_gpu_state(struct brw_context *brw)
                                REG_MASK(GEN11_STATE_CACHE_REDIRECT_TO_CS_SECTION_ENABLE));
    }
 
+   /* hardware specification recommends disabling repacking for
+    * the compatibility with decompression mechanism in display controller.
+    */
+   if (devinfo->disable_ccs_repack) {
+      brw_load_register_imm32(brw, GEN7_CACHE_MODE_0,
+                              GEN11_DISABLE_REPACKING_FOR_COMPRESSION |
+                              REG_MASK(GEN11_DISABLE_REPACKING_FOR_COMPRESSION));
+   }
+
    if (devinfo->gen == 10 || devinfo->gen == 11) {
       /* From gen10 workaround table in h/w specs:
        *
-- 
2.17.1