rockchip: Add support for AFBC buffers

This adds support for allocating AFBC (ARM FrameBuffer Compression)
buffers with minigbm for Rockchip SoCs. AFBC buffers are allocated
through the new gbm_bo_create_with_modifiers() entry point. Callers are
responsible for determining which modifiers are valid for the intended
use case and pass in that list. gbm will then pick the optimal modifier
and allocate a buffer with that layout.  The chosen modifier can be
queries through gbm_bo_get_format_modifier().

Callers of the new entry point are expected to forward the modifier when
using the buffer with other APIs (EGL, KMS etc). The old gbm_bo_create()
entry point continues to work as before and won't allocate AFBC buffers.

BUG=chrome-os-partner:56407
TEST=drm-tests null_platform_test with AFBC support

Change-Id: I1aa345b0d79c4545b7bfc17e9699ef6ad57c68e2
Reviewed-on: https://chromium-review.googlesource.com/386318
Commit-Ready: Kristian H. Kristensen <hoegsberg@chromium.org>
Tested-by: Kristian H. Kristensen <hoegsberg@chromium.org>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/drv_priv.h b/drv_priv.h
index 9b0e4da..cdd13ee 100644
--- a/drv_priv.h
+++ b/drv_priv.h
@@ -67,6 +67,11 @@ struct backend
 	void (*close)(struct driver *drv);
 	int (*bo_create)(struct bo *bo, uint32_t width, uint32_t height,
 			 uint32_t format, uint32_t flags);
+	int (*bo_create_with_modifiers)(struct bo *bo,
+					uint32_t width, uint32_t height,
+					uint32_t format,
+					const uint64_t *modifiers,
+					uint32_t count);
 	void* (*bo_map)(struct bo *bo, struct map_info *data, size_t plane);
 	int (*bo_unmap)(struct bo *bo, struct map_info *data);
 	int (*bo_destroy)(struct bo *bo);