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- From 79c9521559f8c8249bf1062353bfd3b710d939c4 Mon Sep 17 00:00:00 2001
- From: Eric Anholt <eric@anholt.net>
- Date: Sat, 2 Jul 2016 14:14:27 -0700
- Subject: [PATCH] drm/vc4: Add a getparam to signal support for branches.
- 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>
- (cherry picked from commit 7363cee5b467c31dc3af2ac98df0634bb8bbc668)
- ---
- drivers/gpu/drm/vc4/vc4_drv.c | 3 +++
- include/uapi/drm/vc4_drm.h | 1 +
- 2 files changed, 4 insertions(+)
- --- a/drivers/gpu/drm/vc4/vc4_drv.c
- +++ b/drivers/gpu/drm/vc4/vc4_drv.c
- @@ -97,6 +97,9 @@ static int vc4_get_param_ioctl(struct dr
- args->value = V3D_READ(V3D_IDENT2);
- pm_runtime_put(&vc4->v3d->pdev->dev);
- break;
- + case DRM_VC4_PARAM_SUPPORTS_BRANCHES:
- + args->value = true;
- + break;
- default:
- DRM_DEBUG("Unknown parameter %d\n", args->param);
- return -EINVAL;
- --- 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;
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