Userspace needs to know if it can create shaders that do branching. Otherwise, for backwards compatibility with old kernels it needs to lower if statements to conditional assignments.
Signed-off-by: Eric Anholt eric@anholt.net --- drivers/gpu/drm/vc4/vc4_drv.c | 3 +++ include/uapi/drm/vc4_drm.h | 1 + 2 files changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/vc4/vc4_drv.c b/drivers/gpu/drm/vc4/vc4_drv.c index 8a2f2b5a8f32..fd6e34600d50 100644 --- a/drivers/gpu/drm/vc4/vc4_drv.c +++ b/drivers/gpu/drm/vc4/vc4_drv.c @@ -59,6 +59,9 @@ static int vc4_get_param_ioctl(struct drm_device *dev, void *data, case DRM_VC4_PARAM_V3D_IDENT2: args->value = V3D_READ(V3D_IDENT2); break; + case DRM_VC4_PARAM_SUPPORTS_BRANCHES: + args->value = true; + break; default: DRM_DEBUG("Unknown parameter %d\n", args->param); return -EINVAL; diff --git a/include/uapi/drm/vc4_drm.h b/include/uapi/drm/vc4_drm.h index c4427d31b346..86cc0cd0d125 100644 --- a/include/uapi/drm/vc4_drm.h +++ b/include/uapi/drm/vc4_drm.h @@ -285,6 +285,7 @@ struct drm_vc4_get_hang_state { #define DRM_VC4_PARAM_V3D_IDENT0 0 #define DRM_VC4_PARAM_V3D_IDENT1 1 #define DRM_VC4_PARAM_V3D_IDENT2 2 +#define DRM_VC4_PARAM_SUPPORTS_BRANCHES 3
struct drm_vc4_get_param { __u32 param;