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, 26 insertions, 0 deletions

diff --git a/gbm.c b/gbm.c
index 1a81e7e..6ad32ce 100644
--- a/gbm.c
+++ b/gbm.c
@@ -137,6 +137,32 @@ PUBLIC struct gbm_bo *gbm_bo_create(struct gbm_device *gbm, uint32_t width,
 	return bo;
 }
 
+PUBLIC struct gbm_bo *gbm_bo_create_with_modifiers(struct gbm_device *gbm,
+						   uint32_t width,
+						   uint32_t height,
+						   uint32_t format,
+						   const uint64_t *modifiers,
+						   uint32_t count)
+{
+	struct gbm_bo *bo;
+
+	bo = gbm_bo_new(gbm, format);
+
+	if (!bo)
+		return NULL;
+
+	bo->bo = drv_bo_create_with_modifiers(gbm->drv,
+					      width, height, format,
+					      modifiers, count);
+
+	if (!bo->bo) {
+		free(bo);
+		return NULL;
+	}
+
+	return bo;
+}
+
 PUBLIC void gbm_bo_destroy(struct gbm_bo *bo)
 {
 	if (bo->destroy_user_data) {