target/linux/brcm2708/patches-4.9/950-0163-drm-vc4-Add-support-for-rendering-with-ETC1-textures.patch

   1 From 4b1b99ebbada744ef72af56b022492609feb9bba Mon Sep 17 00:00:00 2001
   2 From: Eric Anholt <eric@anholt.net>
   3 Date: Thu, 3 Nov 2016 18:53:10 -0700
   4 Subject: [PATCH] drm/vc4: Add support for rendering with ETC1 textures.
   5
   6 The validation for it ends up being quite simple, but I hadn't got
   7 around to it before merging the driver.  For backwards compatibility,
   8 we also need to add a flag so that the userspace GL driver can easily
   9 tell if the kernel will allow ETC1 textures (on an old kernel, it will
  10 continue to convert to RGBA8)
  11
  12 Signed-off-by: Eric Anholt <eric@anholt.net>
  13 (cherry picked from commit 7154d76fedf549607afbc0d13db9aaf02da5cebf)
  14 ---
  15  drivers/gpu/drm/vc4/vc4_drv.c      | 1 +
  16  drivers/gpu/drm/vc4/vc4_validate.c | 7 +++++++
  17  include/uapi/drm/vc4_drm.h         | 1 +
  18  3 files changed, 9 insertions(+)
  19
  20 --- a/drivers/gpu/drm/vc4/vc4_drv.c
  21 +++ b/drivers/gpu/drm/vc4/vc4_drv.c
  22 @@ -81,6 +81,7 @@ static int vc4_get_param_ioctl(struct dr
  23                 pm_runtime_put_autosuspend(&vc4->v3d->pdev->dev);
  24                 break;
  25         case DRM_VC4_PARAM_SUPPORTS_BRANCHES:
  26 +       case DRM_VC4_PARAM_SUPPORTS_ETC1:
  27                 args->value = true;
  28                 break;
  29         default:
  30 --- a/drivers/gpu/drm/vc4/vc4_validate.c
  31 +++ b/drivers/gpu/drm/vc4/vc4_validate.c
  32 @@ -644,6 +644,13 @@ reloc_tex(struct vc4_exec_info *exec,
  33                 cpp = 1;
  34                 break;
  35         case VC4_TEXTURE_TYPE_ETC1:
  36 +               /* ETC1 is arranged as 64-bit blocks, where each block is 4x4
  37 +                * pixels.
  38 +                */
  39 +               cpp = 8;
  40 +               width = (width + 3) >> 2;
  41 +               height = (height + 3) >> 2;
  42 +               break;
  43         case VC4_TEXTURE_TYPE_BW1:
  44         case VC4_TEXTURE_TYPE_A4:
  45         case VC4_TEXTURE_TYPE_A1:
  46 --- a/include/uapi/drm/vc4_drm.h
  47 +++ b/include/uapi/drm/vc4_drm.h
  48 @@ -286,6 +286,7 @@ struct drm_vc4_get_hang_state {
  49  #define DRM_VC4_PARAM_V3D_IDENT1               1
  50  #define DRM_VC4_PARAM_V3D_IDENT2               2
  51  #define DRM_VC4_PARAM_SUPPORTS_BRANCHES                3
  52 +#define DRM_VC4_PARAM_SUPPORTS_ETC1            4
  53
  54  struct drm_vc4_get_param {
  55         __u32 param;