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 struct drm_framebuffer *
57 rockchip_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
58 			const struct drm_mode_fb_cmd2 *mode_cmd)
59 {
60 	const struct drm_format_info *info = drm_get_format_info(dev,
61 								 mode_cmd);
62 	struct drm_framebuffer *fb;
63 	struct drm_gem_object *objs[ROCKCHIP_MAX_FB_BUFFER];
64 	struct drm_gem_object *obj;
65 	int num_planes = min_t(int, info->num_planes, ROCKCHIP_MAX_FB_BUFFER);
66 	int ret;
67 	int i;
68 
69 	for (i = 0; i < num_planes; i++) {
70 		unsigned int width = mode_cmd->width / (i ? info->hsub : 1);
71 		unsigned int height = mode_cmd->height / (i ? info->vsub : 1);
72 		unsigned int min_size;
73 
74 		obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[i]);
75 		if (!obj) {
76 			DRM_DEV_ERROR(dev->dev,
77 				      "Failed to lookup GEM object\n");
78 			ret = -ENXIO;
79 			goto err_gem_object_unreference;
80 		}
81 
82 		min_size = (height - 1) * mode_cmd->pitches[i] +
83 			mode_cmd->offsets[i] +
84 			width * info->cpp[i];
85 
86 		if (obj->size < min_size) {
87 			drm_gem_object_put_unlocked(obj);
88 			ret = -EINVAL;
89 			goto err_gem_object_unreference;
90 		}
91 		objs[i] = obj;
92 	}
93 
94 	fb = rockchip_fb_alloc(dev, mode_cmd, objs, i);
95 	if (IS_ERR(fb)) {
96 		ret = PTR_ERR(fb);
97 		goto err_gem_object_unreference;
98 	}
99 
100 	return fb;
101 
102 err_gem_object_unreference:
103 	for (i--; i >= 0; i--)
104 		drm_gem_object_put_unlocked(objs[i]);
105 	return ERR_PTR(ret);
106 }
107 
108 static const struct drm_mode_config_helper_funcs rockchip_mode_config_helpers = {
109 	.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
110 };
111 
112 static const struct drm_mode_config_funcs rockchip_drm_mode_config_funcs = {
113 	.fb_create = rockchip_user_fb_create,
114 	.output_poll_changed = drm_fb_helper_output_poll_changed,
115 	.atomic_check = drm_atomic_helper_check,
116 	.atomic_commit = drm_atomic_helper_commit,
117 };
118 
119 struct drm_framebuffer *
120 rockchip_drm_framebuffer_init(struct drm_device *dev,
121 			      const struct drm_mode_fb_cmd2 *mode_cmd,
122 			      struct drm_gem_object *obj)
123 {
124 	struct drm_framebuffer *fb;
125 
126 	fb = rockchip_fb_alloc(dev, mode_cmd, &obj, 1);
127 	if (IS_ERR(fb))
128 		return ERR_CAST(fb);
129 
130 	return fb;
131 }
132 
133 void rockchip_drm_mode_config_init(struct drm_device *dev)
134 {
135 	dev->mode_config.min_width = 0;
136 	dev->mode_config.min_height = 0;
137 
138 	/*
139 	 * set max width and height as default value(4096x4096).
140 	 * this value would be used to check framebuffer size limitation
141 	 * at drm_mode_addfb().
142 	 */
143 	dev->mode_config.max_width = 4096;
144 	dev->mode_config.max_height = 4096;
145 
146 	dev->mode_config.funcs = &rockchip_drm_mode_config_funcs;
147 	dev->mode_config.helper_private = &rockchip_mode_config_helpers;
148 }
149