]> Git Repo - linux.git/blob - drivers/gpu/drm/exynos/exynos_drm_fb.c
Merge tag 'mmc-v4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc
[linux.git] / drivers / gpu / drm / exynos / exynos_drm_fb.c
1 /* exynos_drm_fb.c
2  *
3  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4  * Authors:
5  *      Inki Dae <[email protected]>
6  *      Joonyoung Shim <[email protected]>
7  *      Seung-Woo Kim <[email protected]>
8  *
9  * This program is free software; you can redistribute  it and/or modify it
10  * under  the terms of  the GNU General  Public License as published by the
11  * Free Software Foundation;  either version 2 of the  License, or (at your
12  * option) any later version.
13  */
14
15 #include <drm/drmP.h>
16 #include <drm/drm_crtc.h>
17 #include <drm/drm_crtc_helper.h>
18 #include <drm/drm_fb_helper.h>
19 #include <drm/drm_atomic.h>
20 #include <drm/drm_atomic_helper.h>
21 #include <drm/drm_gem_framebuffer_helper.h>
22 #include <uapi/drm/exynos_drm.h>
23
24 #include "exynos_drm_drv.h"
25 #include "exynos_drm_fb.h"
26 #include "exynos_drm_fbdev.h"
27 #include "exynos_drm_crtc.h"
28
29 static int check_fb_gem_memory_type(struct drm_device *drm_dev,
30                                     struct exynos_drm_gem *exynos_gem)
31 {
32         unsigned int flags;
33
34         /*
35          * if exynos drm driver supports iommu then framebuffer can use
36          * all the buffer types.
37          */
38         if (is_drm_iommu_supported(drm_dev))
39                 return 0;
40
41         flags = exynos_gem->flags;
42
43         /*
44          * Physically non-contiguous memory type for framebuffer is not
45          * supported without IOMMU.
46          */
47         if (IS_NONCONTIG_BUFFER(flags)) {
48                 DRM_ERROR("Non-contiguous GEM memory is not supported.\n");
49                 return -EINVAL;
50         }
51
52         return 0;
53 }
54
55 static const struct drm_framebuffer_funcs exynos_drm_fb_funcs = {
56         .destroy        = drm_gem_fb_destroy,
57         .create_handle  = drm_gem_fb_create_handle,
58 };
59
60 struct drm_framebuffer *
61 exynos_drm_framebuffer_init(struct drm_device *dev,
62                             const struct drm_mode_fb_cmd2 *mode_cmd,
63                             struct exynos_drm_gem **exynos_gem,
64                             int count)
65 {
66         struct drm_framebuffer *fb;
67         int i;
68         int ret;
69
70         fb = kzalloc(sizeof(*fb), GFP_KERNEL);
71         if (!fb)
72                 return ERR_PTR(-ENOMEM);
73
74         for (i = 0; i < count; i++) {
75                 ret = check_fb_gem_memory_type(dev, exynos_gem[i]);
76                 if (ret < 0)
77                         goto err;
78
79                 fb->obj[i] = &exynos_gem[i]->base;
80         }
81
82         drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
83
84         ret = drm_framebuffer_init(dev, fb, &exynos_drm_fb_funcs);
85         if (ret < 0) {
86                 DRM_ERROR("failed to initialize framebuffer\n");
87                 goto err;
88         }
89
90         return fb;
91
92 err:
93         kfree(fb);
94         return ERR_PTR(ret);
95 }
96
97 static struct drm_framebuffer *
98 exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
99                       const struct drm_mode_fb_cmd2 *mode_cmd)
100 {
101         const struct drm_format_info *info = drm_get_format_info(dev, mode_cmd);
102         struct exynos_drm_gem *exynos_gem[MAX_FB_BUFFER];
103         struct drm_framebuffer *fb;
104         int i;
105         int ret;
106
107         for (i = 0; i < info->num_planes; i++) {
108                 unsigned int height = (i == 0) ? mode_cmd->height :
109                                      DIV_ROUND_UP(mode_cmd->height, info->vsub);
110                 unsigned long size = height * mode_cmd->pitches[i] +
111                                      mode_cmd->offsets[i];
112
113                 exynos_gem[i] = exynos_drm_gem_get(file_priv,
114                                                    mode_cmd->handles[i]);
115                 if (!exynos_gem[i]) {
116                         DRM_ERROR("failed to lookup gem object\n");
117                         ret = -ENOENT;
118                         goto err;
119                 }
120
121                 if (size > exynos_gem[i]->size) {
122                         i++;
123                         ret = -EINVAL;
124                         goto err;
125                 }
126         }
127
128         fb = exynos_drm_framebuffer_init(dev, mode_cmd, exynos_gem, i);
129         if (IS_ERR(fb)) {
130                 ret = PTR_ERR(fb);
131                 goto err;
132         }
133
134         return fb;
135
136 err:
137         while (i--)
138                 exynos_drm_gem_put(exynos_gem[i]);
139
140         return ERR_PTR(ret);
141 }
142
143 dma_addr_t exynos_drm_fb_dma_addr(struct drm_framebuffer *fb, int index)
144 {
145         struct exynos_drm_gem *exynos_gem;
146
147         if (WARN_ON_ONCE(index >= MAX_FB_BUFFER))
148                 return 0;
149
150         exynos_gem = to_exynos_gem(fb->obj[index]);
151         return exynos_gem->dma_addr + fb->offsets[index];
152 }
153
154 static struct drm_mode_config_helper_funcs exynos_drm_mode_config_helpers = {
155         .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
156 };
157
158 static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
159         .fb_create = exynos_user_fb_create,
160         .output_poll_changed = drm_fb_helper_output_poll_changed,
161         .atomic_check = drm_atomic_helper_check,
162         .atomic_commit = drm_atomic_helper_commit,
163 };
164
165 void exynos_drm_mode_config_init(struct drm_device *dev)
166 {
167         dev->mode_config.min_width = 0;
168         dev->mode_config.min_height = 0;
169
170         /*
171          * set max width and height as default value(4096x4096).
172          * this value would be used to check framebuffer size limitation
173          * at drm_mode_addfb().
174          */
175         dev->mode_config.max_width = 4096;
176         dev->mode_config.max_height = 4096;
177
178         dev->mode_config.funcs = &exynos_drm_mode_config_funcs;
179         dev->mode_config.helper_private = &exynos_drm_mode_config_helpers;
180
181         dev->mode_config.allow_fb_modifiers = true;
182
183         dev->mode_config.normalize_zpos = true;
184 }
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