+ if (key.tiling == I915_TILING_NONE) {
+ surf.ss1.base_addr = key.draw_offset;
+ } else {
+ uint32_t tile_offset = key.draw_offset % 4096;
+
+ surf.ss1.base_addr = key.draw_offset - tile_offset;
+
+ assert(BRW_IS_G4X(brw) || tile_offset == 0);
+ if (BRW_IS_G4X(brw)) {
+ if (key.tiling == I915_TILING_X) {
+ /* Note that the low bits of these fields are missing, so
+ * there's the possibility of getting in trouble.
+ */
+ surf.ss5.x_offset = (tile_offset % 512) / key.cpp / 4;
+ surf.ss5.y_offset = tile_offset / 512 / 2;
+ } else {
+ surf.ss5.x_offset = (tile_offset % 128) / key.cpp / 4;
+ surf.ss5.y_offset = tile_offset / 128 / 2;
+ }
+ }
+ }