minigbm: add amlogic backend

Add dumb amlogic backend based on udl.

BUG=none
TEST=emerge-falco minigbm

Change-Id: I435d0924d8206b4058b76bf403175f9b2cbb1291
Reviewed-on: https://chromium-review.googlesource.com/861865
Commit-Ready: Gurchetan Singh <gurchetansingh@chromium.org>
Tested-by: Gurchetan Singh <gurchetansingh@chromium.org>
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
Reviewed-by: Sergey Volk <servolk@chromium.org>

Makefile

@@ -16,6 +16,9 @@ ifdef DRV_AMDGPU
 	CFLAGS += $(shell $(PKG_CONFIG) --cflags libdrm_amdgpu)
 	LDLIBS += -lamdgpuaddr
 endif
+ifdef DRV_AMLOGIC
+	CFLAGS += $(shell $(PKG_CONFIG) --cflags libdrm_amlogic)
+endif
 ifdef DRV_EXYNOS
 	CFLAGS += $(shell $(PKG_CONFIG) --cflags libdrm_exynos)
 endif

amlogic.c

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2018 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifdef DRV_AMLOGIC
+
+#include "drv_priv.h"
+#include "helpers.h"
+#include "util.h"
+
+static const uint32_t render_target_formats[] = { DRM_FORMAT_ARGB8888, DRM_FORMAT_XRGB8888 };
+
+static int amlogic_init(struct driver *drv)
+{
+	drv_add_combinations(drv, render_target_formats, ARRAY_SIZE(render_target_formats),
+			     &LINEAR_METADATA, BO_USE_RENDER_MASK);
+
+	return drv_modify_linear_combinations(drv);
+}
+
+const struct backend backend_amlogic = {
+	.name = "amlogic",
+	.init = amlogic_init,
+	.bo_create = drv_dumb_bo_create,
+	.bo_destroy = drv_dumb_bo_destroy,
+	.bo_import = drv_prime_bo_import,
+	.bo_map = drv_dumb_bo_map,
+	.bo_unmap = drv_bo_munmap,
+};
+
+#endif

drv.c

@@ -67,6 +67,9 @@ static const struct backend *drv_get_backend(int fd)
 	const struct backend *backend_list[] = {
 #ifdef DRV_AMDGPU
 		&backend_amdgpu,
+#endif
+#ifdef DRV_AMLOGIC
+		&backend_amlogic,
 #endif
 		&backend_evdi,
 #ifdef DRV_EXYNOS