target/linux/brcm2708/patches-4.4/0480-drm-vc4-Add-a-getparam-to-signal-support-for-branche.patch

   1 From f6b1410aedc0c8d04363a930fd70509e30e23eeb Mon Sep 17 00:00:00 2001
   2 From: Eric Anholt <eric@anholt.net>
   3 Date: Sat, 2 Jul 2016 14:14:27 -0700
   4 Subject: [PATCH] drm/vc4: Add a getparam to signal support for branches.
   5
   6 Userspace needs to know if it can create shaders that do branching.
   7 Otherwise, for backwards compatibility with old kernels it needs to
   8 lower if statements to conditional assignments.
   9
  10 Signed-off-by: Eric Anholt <eric@anholt.net>
  11 (cherry picked from commit 7363cee5b467c31dc3af2ac98df0634bb8bbc668)
  12 ---
  13  drivers/gpu/drm/vc4/vc4_drv.c | 3 +++
  14  include/uapi/drm/vc4_drm.h    | 1 +
  15  2 files changed, 4 insertions(+)
  16
  17 --- a/drivers/gpu/drm/vc4/vc4_drv.c
  18 +++ b/drivers/gpu/drm/vc4/vc4_drv.c
  19 @@ -97,6 +97,9 @@ static int vc4_get_param_ioctl(struct dr
  20                 args->value = V3D_READ(V3D_IDENT2);
  21                 pm_runtime_put(&vc4->v3d->pdev->dev);
  22                 break;
  23 +       case DRM_VC4_PARAM_SUPPORTS_BRANCHES:
  24 +               args->value = true;
  25 +               break;
  26         default:
  27                 DRM_DEBUG("Unknown parameter %d\n", args->param);
  28                 return -EINVAL;
  29 --- a/include/uapi/drm/vc4_drm.h
  30 +++ b/include/uapi/drm/vc4_drm.h
  31 @@ -285,6 +285,7 @@ struct drm_vc4_get_hang_state {
  32  #define DRM_VC4_PARAM_V3D_IDENT0               0
  33  #define DRM_VC4_PARAM_V3D_IDENT1               1
  34  #define DRM_VC4_PARAM_V3D_IDENT2               2
  35 +#define DRM_VC4_PARAM_SUPPORTS_BRANCHES                3
  36
  37  struct drm_vc4_get_param {
  38         __u32 param;