gallium/radeon: don't disable DCC because of SDMA

We want to keep DCC enabled to save bandwidth. It was a bad idea to disable
it here.

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

diff --git a/src/gallium/drivers/radeon/r600_texture.c b/src/gallium/drivers/radeon/r600_texture.c
index b276417..27b464f 100644 (file)
--- a/src/gallium/drivers/radeon/r600_texture.c
+++ b/src/gallium/drivers/radeon/r600_texture.c
@@ -32,8 +32,6 @@
 #include <errno.h>
 #include <inttypes.h>
 
-static bool r600_texture_discard_dcc(struct r600_common_screen *rscreen,
-                                    struct r600_texture *rtex);
 static void r600_texture_discard_cmask(struct r600_common_screen *rscreen,
                                       struct r600_texture *rtex);
 static unsigned r600_choose_tiling(struct r600_common_screen *rscreen,
@@ -69,27 +67,12 @@ bool r600_prepare_for_dma_blit(struct r600_common_context *rctx,
 
        /* DCC as:
         *   src: Use the 3D path. DCC decompression is expensive.
-        *   dst: If overwriting the whole texture, discard DCC and use SDMA.
-        *        Otherwise, use the 3D path.
+        *   dst: Use the 3D path to compress the pixels with DCC.
         */
-       if (rsrc->dcc_offset && rsrc->surface.level[src_level].dcc_enabled)
+       if ((rsrc->dcc_offset && rsrc->surface.level[src_level].dcc_enabled) ||
+           (rdst->dcc_offset && rdst->surface.level[dst_level].dcc_enabled))
                return false;
 
-       if (rdst->dcc_offset && rdst->surface.level[dst_level].dcc_enabled) {
-               /* We can't discard DCC if the texture has been exported.
-                * We can only discard DCC for the entire texture.
-                */
-               if (rdst->resource.is_shared ||
-                   rdst->resource.b.b.last_level > 0 ||
-                   !util_texrange_covers_whole_level(&rdst->resource.b.b, dst_level,
-                                                     dstx, dsty, dstz, src_box->width,
-                                                     src_box->height, src_box->depth))
-                       return false;
-
-               if (!r600_texture_discard_dcc(rctx->screen, rdst))
-                       return false;
-       }
-
        /* CMASK as:
         *   src: Both texture and SDMA paths need decompression. Use SDMA.
         *   dst: If overwriting the whole texture, discard CMASK and use