1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
4  * Author:Mark Yao <mark.yao@rock-chips.com>
5  */
6 
7 #include <linux/kernel.h>
8 
9 #include <drm/drm.h>
10 #include <drm/drm_atomic.h>
11 #include <drm/drm_damage_helper.h>
12 #include <drm/drm_fb_helper.h>
13 #include <drm/drm_fourcc.h>
14 #include <drm/drm_gem_framebuffer_helper.h>
15 #include <drm/drm_probe_helper.h>
16 
17 #include "rockchip_drm_drv.h"
18 #include "rockchip_drm_fb.h"
19 #include "rockchip_drm_gem.h"
20 
21 static const struct drm_framebuffer_funcs rockchip_drm_fb_funcs = {
22 	.destroy       = drm_gem_fb_destroy,
23 	.create_handle = drm_gem_fb_create_handle,
24 	.dirty	       = drm_atomic_helper_dirtyfb,
25 };
26 
27 static struct drm_framebuffer *
28 rockchip_fb_alloc(struct drm_device *dev, const struct drm_mode_fb_cmd2 *mode_cmd,
29 		  struct drm_gem_object **obj, unsigned int num_planes)
30 {
31 	struct drm_framebuffer *fb;
32 	int ret;
33 	int i;
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_cmd);
40 
41 	for (i = 0; i < num_planes; i++)
42 		fb->obj[i] = obj[i];
43 
44 	ret = drm_framebuffer_init(dev, fb, &rockchip_drm_fb_funcs);
45 	if (ret) {
46 		DRM_DEV_ERROR(dev->dev,
47 			      "Failed to initialize framebuffer: %d\n",
48 			      ret);
49 		kfree(fb);
50 		return ERR_PTR(ret);
51 	}
52 
53 	return fb;
54 }
55 
56 static const struct drm_mode_config_helper_funcs rockchip_mode_config_helpers = {
57 	.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
58 };
59 
60 static struct drm_framebuffer *
61 rockchip_fb_create(struct drm_device *dev, struct drm_file *file,
62 		   const struct drm_mode_fb_cmd2 *mode_cmd)
63 {
64 	struct drm_afbc_framebuffer *afbc_fb;
65 	const struct drm_format_info *info;
66 	int ret;
67 
68 	info = drm_get_format_info(dev, mode_cmd);
69 	if (!info)
70 		return ERR_PTR(-ENOMEM);
71 
72 	afbc_fb = kzalloc(sizeof(*afbc_fb), GFP_KERNEL);
73 	if (!afbc_fb)
74 		return ERR_PTR(-ENOMEM);
75 
76 	ret = drm_gem_fb_init_with_funcs(dev, &afbc_fb->base, file, mode_cmd,
77 					 &rockchip_drm_fb_funcs);
78 	if (ret) {
79 		kfree(afbc_fb);
80 		return ERR_PTR(ret);
81 	}
82 
83 	if (drm_is_afbc(mode_cmd->modifier[0])) {
84 		int ret, i;
85 
86 		ret = drm_gem_fb_afbc_init(dev, mode_cmd, afbc_fb);
87 		if (ret) {
88 			struct drm_gem_object **obj = afbc_fb->base.obj;
89 
90 			for (i = 0; i < info->num_planes; ++i)
91 				drm_gem_object_put_unlocked(obj[i]);
92 
93 			kfree(afbc_fb);
94 			return ERR_PTR(ret);
95 		}
96 	}
97 
98 	return &afbc_fb->base;
99 }
100 
101 static const struct drm_mode_config_funcs rockchip_drm_mode_config_funcs = {
102 	.fb_create = rockchip_fb_create,
103 	.output_poll_changed = drm_fb_helper_output_poll_changed,
104 	.atomic_check = drm_atomic_helper_check,
105 	.atomic_commit = drm_atomic_helper_commit,
106 };
107 
108 struct drm_framebuffer *
109 rockchip_drm_framebuffer_init(struct drm_device *dev,
110 			      const struct drm_mode_fb_cmd2 *mode_cmd,
111 			      struct drm_gem_object *obj)
112 {
113 	struct drm_framebuffer *fb;
114 
115 	fb = rockchip_fb_alloc(dev, mode_cmd, &obj, 1);
116 	if (IS_ERR(fb))
117 		return ERR_CAST(fb);
118 
119 	return fb;
120 }
121 
122 void rockchip_drm_mode_config_init(struct drm_device *dev)
123 {
124 	dev->mode_config.min_width = 0;
125 	dev->mode_config.min_height = 0;
126 
127 	/*
128 	 * set max width and height as default value(4096x4096).
129 	 * this value would be used to check framebuffer size limitation
130 	 * at drm_mode_addfb().
131 	 */
132 	dev->mode_config.max_width = 4096;
133 	dev->mode_config.max_height = 4096;
134 
135 	dev->mode_config.funcs = &rockchip_drm_mode_config_funcs;
136 	dev->mode_config.helper_private = &rockchip_mode_config_helpers;
137 }
138