[PATCH 5/7] drm/vc4: Add a getparam to signal support for branches.

From	Eric Anholt <eric@anholt.net>
Newsgroups	linux.kernel
Subject	[PATCH 5/7] drm/vc4: Add a getparam to signal support for branches.
Date	2016-07-05 03:20 +0200
Message-ID	<rRnbP-4xL-3@gated-at.bofh.it> (permalink)
References	<rRnbP-4xL-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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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;
-- 
2.8.1

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[PATCH 5/7] drm/vc4: Add a getparam to signal support for branches. Eric Anholt <eric@anholt.net> - 2016-07-05 03:20 +0200

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