1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Copyright (c) 2015 MediaTek Inc.
 4 */
 5
 6#include <linux/dma-buf.h>
 7#include <linux/dma-resv.h>
 8
 9#include <drm/drm_modeset_helper.h>
10#include <drm/drm_fb_helper.h>
11#include <drm/drm_fourcc.h>
12#include <drm/drm_gem.h>
13#include <drm/drm_gem_framebuffer_helper.h>
14
15#include "mtk_drm_drv.h"
16#include "mtk_drm_fb.h"
17#include "mtk_drm_gem.h"
18
19static const struct drm_framebuffer_funcs mtk_drm_fb_funcs = {
20	.create_handle = drm_gem_fb_create_handle,
21	.destroy = drm_gem_fb_destroy,
22};
23
24static struct drm_framebuffer *mtk_drm_framebuffer_init(struct drm_device *dev,
25					const struct drm_mode_fb_cmd2 *mode,
26					struct drm_gem_object *obj)
27{
28	const struct drm_format_info *info = drm_get_format_info(dev, mode);
29	struct drm_framebuffer *fb;
30	int ret;
31
32	if (info->num_planes != 1)
33		return ERR_PTR(-EINVAL);
34
35	fb = kzalloc(sizeof(*fb), GFP_KERNEL);
36	if (!fb)
37		return ERR_PTR(-ENOMEM);
38
39	drm_helper_mode_fill_fb_struct(dev, fb, mode);
40
41	fb->obj[0] = obj;
42
43	ret = drm_framebuffer_init(dev, fb, &mtk_drm_fb_funcs);
44	if (ret) {
45		DRM_ERROR("failed to initialize framebuffer\n");
46		kfree(fb);
47		return ERR_PTR(ret);
48	}
49
50	return fb;
51}
52
53struct drm_framebuffer *mtk_drm_mode_fb_create(struct drm_device *dev,
54					       struct drm_file *file,
55					       const struct drm_mode_fb_cmd2 *cmd)
56{
57	const struct drm_format_info *info = drm_get_format_info(dev, cmd);
58	struct drm_framebuffer *fb;
59	struct drm_gem_object *gem;
60	unsigned int width = cmd->width;
61	unsigned int height = cmd->height;
62	unsigned int size, bpp;
63	int ret;
64
65	if (info->num_planes != 1)
66		return ERR_PTR(-EINVAL);
67
68	gem = drm_gem_object_lookup(file, cmd->handles[0]);
69	if (!gem)
70		return ERR_PTR(-ENOENT);
71
72	bpp = info->cpp[0];
73	size = (height - 1) * cmd->pitches[0] + width * bpp;
74	size += cmd->offsets[0];
75
76	if (gem->size < size) {
77		ret = -EINVAL;
78		goto unreference;
79	}
80
81	fb = mtk_drm_framebuffer_init(dev, cmd, gem);
82	if (IS_ERR(fb)) {
83		ret = PTR_ERR(fb);
84		goto unreference;
85	}
86
87	return fb;
88
89unreference:
90	drm_gem_object_put_unlocked(gem);
91	return ERR_PTR(ret);
92}