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 at 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;
--
2.8.1
