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From 466102927ee6a21eb58d0f5f98b85155e7ee8e5b Mon Sep 17 00:00:00 2001
From: Eric Anholt <eric@anholt.net>
Date: Thu, 3 Nov 2016 18:53:10 -0700
Subject: [PATCH] drm/vc4: Add support for rendering with ETC1 textures.
The validation for it ends up being quite simple, but I hadn't got
around to it before merging the driver. For backwards compatibility,
we also need to add a flag so that the userspace GL driver can easily
tell if the kernel will allow ETC1 textures (on an old kernel, it will
continue to convert to RGBA8)
Signed-off-by: Eric Anholt <eric@anholt.net>
(cherry picked from commit 7154d76fedf549607afbc0d13db9aaf02da5cebf)
---
drivers/gpu/drm/vc4/vc4_drv.c | 1 +
drivers/gpu/drm/vc4/vc4_validate.c | 7 +++++++
include/uapi/drm/vc4_drm.h | 1 +
3 files changed, 9 insertions(+)
--- a/drivers/gpu/drm/vc4/vc4_drv.c
+++ b/drivers/gpu/drm/vc4/vc4_drv.c
@@ -103,6 +103,7 @@ static int vc4_get_param_ioctl(struct dr
pm_runtime_put(&vc4->v3d->pdev->dev);
break;
case DRM_VC4_PARAM_SUPPORTS_BRANCHES:
+ case DRM_VC4_PARAM_SUPPORTS_ETC1:
args->value = true;
break;
default:
--- a/drivers/gpu/drm/vc4/vc4_validate.c
+++ b/drivers/gpu/drm/vc4/vc4_validate.c
@@ -644,6 +644,13 @@ reloc_tex(struct vc4_exec_info *exec,
cpp = 1;
break;
case VC4_TEXTURE_TYPE_ETC1:
+ /* ETC1 is arranged as 64-bit blocks, where each block is 4x4
+ * pixels.
+ */
+ cpp = 8;
+ width = (width + 3) >> 2;
+ height = (height + 3) >> 2;
+ break;
case VC4_TEXTURE_TYPE_BW1:
case VC4_TEXTURE_TYPE_A4:
case VC4_TEXTURE_TYPE_A1:
--- a/include/uapi/drm/vc4_drm.h
+++ b/include/uapi/drm/vc4_drm.h
@@ -286,6 +286,7 @@ struct drm_vc4_get_hang_state {
#define DRM_VC4_PARAM_V3D_IDENT1 1
#define DRM_VC4_PARAM_V3D_IDENT2 2
#define DRM_VC4_PARAM_SUPPORTS_BRANCHES 3
+#define DRM_VC4_PARAM_SUPPORTS_ETC1 4
struct drm_vc4_get_param {
__u32 param;
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