vgem.c

   1 /*
   2  * Copyright 2016 The Chromium OS Authors. All rights reserved.
   3  * Use of this source code is governed by a BSD-style license that can be
   4  * found in the LICENSE file.
   5  */
   6
   7 #include "drv_priv.h"
   8 #include "helpers.h"
   9 #include "util.h"
  10
  11 static struct supported_combination combos[2] = {
  12         {DRM_FORMAT_ABGR8888, DRM_FORMAT_MOD_NONE,
  13                 DRV_BO_USE_RENDERING | DRV_BO_USE_SW_READ_OFTEN | DRV_BO_USE_SW_WRITE_OFTEN},
  14         {DRM_FORMAT_YVU420, DRM_FORMAT_MOD_NONE,
  15                 DRV_BO_USE_RENDERING | DRV_BO_USE_SW_READ_RARELY | DRV_BO_USE_SW_WRITE_RARELY},
  16 };
  17
  18 static int vgem_init(struct driver *drv)
  19 {
  20         drv_insert_combinations(drv, combos, ARRAY_SIZE(combos));
  21         return 0;
  22 }
  23
  24 static uint32_t vgem_resolve_format(uint32_t format)
  25 {
  26         switch (format) {
  27         case DRM_FORMAT_FLEX_IMPLEMENTATION_DEFINED:
  28                 /*HACK: See b/28671744 */
  29                 return DRM_FORMAT_XBGR8888;
  30         case DRM_FORMAT_FLEX_YCbCr_420_888:
  31                 return DRM_FORMAT_YVU420;
  32         default:
  33                 return format;
  34         }
  35 }
  36
  37 struct backend backend_vgem =
  38 {
  39         .name = "vgem",
  40         .init = vgem_init,
  41         .bo_create = drv_dumb_bo_create,
  42         .bo_destroy = drv_dumb_bo_destroy,
  43         .bo_map = drv_dumb_bo_map,
  44         .resolve_format = vgem_resolve_format,
  45 };
  46