+ } else if (modifier == I915_FORMAT_MOD_Y_TILED_CCS) {
+ /*
+ * For compressed surfaces, we need a color control surface
+ * (CCS). Color compression is only supported for Y tiled
+ * surfaces, and for each 32x16 tiles in the main surface we
+ * need a tile in the control surface. Y tiles are 128 bytes
+ * wide and 32 lines tall and we use that to first compute the
+ * width and height in tiles of the main surface. stride and
+ * height are already multiples of 128 and 32, respectively:
+ */
+ uint32_t stride = drv_stride_from_format(format, width, 0);
+ uint32_t width_in_tiles = DIV_ROUND_UP(stride, 128);
+ uint32_t height_in_tiles = DIV_ROUND_UP(height, 32);
+ uint32_t size = width_in_tiles * height_in_tiles * 4096;
+ uint32_t offset = 0;
+
+ bo->meta.strides[0] = width_in_tiles * 128;
+ bo->meta.sizes[0] = size;
+ bo->meta.offsets[0] = offset;
+ offset += size;
+
+ /*
+ * Now, compute the width and height in tiles of the control
+ * surface by dividing and rounding up.
+ */
+ uint32_t ccs_width_in_tiles = DIV_ROUND_UP(width_in_tiles, 32);
+ uint32_t ccs_height_in_tiles = DIV_ROUND_UP(height_in_tiles, 16);
+ uint32_t ccs_size = ccs_width_in_tiles * ccs_height_in_tiles * 4096;
+
+ /*
+ * With stride and height aligned to y tiles, offset is
+ * already a multiple of 4096, which is the required alignment
+ * of the CCS.
+ */
+ bo->meta.strides[1] = ccs_width_in_tiles * 128;
+ bo->meta.sizes[1] = ccs_size;
+ bo->meta.offsets[1] = offset;
+ offset += ccs_size;
+
+ bo->meta.num_planes = 2;
+ bo->meta.total_size = offset;