1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2013 Red Hat
4 * Author: Rob Clark <robdclark@gmail.com>
5 */
6
7 #include <linux/fb.h>
8
9 #include <drm/drm_drv.h>
10 #include <drm/drm_crtc_helper.h>
11 #include <drm/drm_fb_helper.h>
12 #include <drm/drm_fourcc.h>
13 #include <drm/drm_framebuffer.h>
14 #include <drm/drm_prime.h>
15
16 #include "msm_drv.h"
17 #include "msm_gem.h"
18 #include "msm_kms.h"
19
20 static bool fbdev = true;
21 MODULE_PARM_DESC(fbdev, "Enable fbdev compat layer");
22 module_param(fbdev, bool, 0600);
23
24 /*
25 * fbdev funcs, to implement legacy fbdev interface on top of drm driver
26 */
27
FB_GEN_DEFAULT_DEFERRED_SYSMEM_OPS(msm_fbdev,drm_fb_helper_damage_range,drm_fb_helper_damage_area)28 FB_GEN_DEFAULT_DEFERRED_SYSMEM_OPS(msm_fbdev,
29 drm_fb_helper_damage_range,
30 drm_fb_helper_damage_area)
31
32 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
33 {
34 struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
35 struct drm_gem_object *bo = msm_framebuffer_bo(helper->fb, 0);
36
37 return drm_gem_prime_mmap(bo, vma);
38 }
39
msm_fbdev_fb_destroy(struct fb_info * info)40 static void msm_fbdev_fb_destroy(struct fb_info *info)
41 {
42 struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
43 struct drm_framebuffer *fb = helper->fb;
44 struct drm_gem_object *bo = msm_framebuffer_bo(fb, 0);
45
46 DBG();
47
48 drm_fb_helper_fini(helper);
49
50 /* this will free the backing object */
51 msm_gem_put_vaddr(bo);
52 drm_framebuffer_remove(fb);
53
54 drm_client_release(&helper->client);
55 drm_fb_helper_unprepare(helper);
56 kfree(helper);
57 }
58
59 static const struct fb_ops msm_fb_ops = {
60 .owner = THIS_MODULE,
61 __FB_DEFAULT_DEFERRED_OPS_RDWR(msm_fbdev),
62 DRM_FB_HELPER_DEFAULT_OPS,
63 __FB_DEFAULT_DEFERRED_OPS_DRAW(msm_fbdev),
64 .fb_mmap = msm_fbdev_mmap,
65 .fb_destroy = msm_fbdev_fb_destroy,
66 };
67
msm_fbdev_create(struct drm_fb_helper * helper,struct drm_fb_helper_surface_size * sizes)68 static int msm_fbdev_create(struct drm_fb_helper *helper,
69 struct drm_fb_helper_surface_size *sizes)
70 {
71 struct drm_device *dev = helper->dev;
72 struct msm_drm_private *priv = dev->dev_private;
73 struct drm_framebuffer *fb = NULL;
74 struct drm_gem_object *bo;
75 struct fb_info *fbi = NULL;
76 uint64_t paddr;
77 uint32_t format;
78 int ret, pitch;
79
80 format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth);
81
82 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
83 sizes->surface_height, sizes->surface_bpp,
84 sizes->fb_width, sizes->fb_height);
85
86 pitch = align_pitch(sizes->surface_width, sizes->surface_bpp);
87 fb = msm_alloc_stolen_fb(dev, sizes->surface_width,
88 sizes->surface_height, pitch, format);
89
90 if (IS_ERR(fb)) {
91 DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n");
92 return PTR_ERR(fb);
93 }
94
95 bo = msm_framebuffer_bo(fb, 0);
96
97 /*
98 * NOTE: if we can be guaranteed to be able to map buffer
99 * in panic (ie. lock-safe, etc) we could avoid pinning the
100 * buffer now:
101 */
102 ret = msm_gem_get_and_pin_iova(bo, priv->kms->aspace, &paddr);
103 if (ret) {
104 DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret);
105 goto fail;
106 }
107
108 fbi = drm_fb_helper_alloc_info(helper);
109 if (IS_ERR(fbi)) {
110 DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n");
111 ret = PTR_ERR(fbi);
112 goto fail;
113 }
114
115 DBG("fbi=%p, dev=%p", fbi, dev);
116
117 helper->fb = fb;
118
119 fbi->fbops = &msm_fb_ops;
120
121 drm_fb_helper_fill_info(fbi, helper, sizes);
122
123 fbi->screen_buffer = msm_gem_get_vaddr(bo);
124 if (IS_ERR(fbi->screen_buffer)) {
125 ret = PTR_ERR(fbi->screen_buffer);
126 goto fail;
127 }
128 fbi->screen_size = bo->size;
129 fbi->fix.smem_start = paddr;
130 fbi->fix.smem_len = bo->size;
131
132 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
133 DBG("allocated %dx%d fb", fb->width, fb->height);
134
135 return 0;
136
137 fail:
138 drm_framebuffer_remove(fb);
139 return ret;
140 }
141
msm_fbdev_fb_dirty(struct drm_fb_helper * helper,struct drm_clip_rect * clip)142 static int msm_fbdev_fb_dirty(struct drm_fb_helper *helper,
143 struct drm_clip_rect *clip)
144 {
145 struct drm_device *dev = helper->dev;
146 int ret;
147
148 /* Call damage handlers only if necessary */
149 if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2))
150 return 0;
151
152 if (helper->fb->funcs->dirty) {
153 ret = helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1);
154 if (drm_WARN_ONCE(dev, ret, "Dirty helper failed: ret=%d\n", ret))
155 return ret;
156 }
157
158 return 0;
159 }
160
161 static const struct drm_fb_helper_funcs msm_fb_helper_funcs = {
162 .fb_probe = msm_fbdev_create,
163 .fb_dirty = msm_fbdev_fb_dirty,
164 };
165
166 /*
167 * struct drm_client
168 */
169
msm_fbdev_client_unregister(struct drm_client_dev * client)170 static void msm_fbdev_client_unregister(struct drm_client_dev *client)
171 {
172 struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
173
174 if (fb_helper->info) {
175 drm_fb_helper_unregister_info(fb_helper);
176 } else {
177 drm_client_release(&fb_helper->client);
178 drm_fb_helper_unprepare(fb_helper);
179 kfree(fb_helper);
180 }
181 }
182
msm_fbdev_client_restore(struct drm_client_dev * client)183 static int msm_fbdev_client_restore(struct drm_client_dev *client)
184 {
185 drm_fb_helper_lastclose(client->dev);
186
187 return 0;
188 }
189
msm_fbdev_client_hotplug(struct drm_client_dev * client)190 static int msm_fbdev_client_hotplug(struct drm_client_dev *client)
191 {
192 struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
193 struct drm_device *dev = client->dev;
194 int ret;
195
196 if (dev->fb_helper)
197 return drm_fb_helper_hotplug_event(dev->fb_helper);
198
199 ret = drm_fb_helper_init(dev, fb_helper);
200 if (ret)
201 goto err_drm_err;
202
203 if (!drm_drv_uses_atomic_modeset(dev))
204 drm_helper_disable_unused_functions(dev);
205
206 ret = drm_fb_helper_initial_config(fb_helper);
207 if (ret)
208 goto err_drm_fb_helper_fini;
209
210 return 0;
211
212 err_drm_fb_helper_fini:
213 drm_fb_helper_fini(fb_helper);
214 err_drm_err:
215 drm_err(dev, "Failed to setup fbdev emulation (ret=%d)\n", ret);
216 return ret;
217 }
218
219 static const struct drm_client_funcs msm_fbdev_client_funcs = {
220 .owner = THIS_MODULE,
221 .unregister = msm_fbdev_client_unregister,
222 .restore = msm_fbdev_client_restore,
223 .hotplug = msm_fbdev_client_hotplug,
224 };
225
226 /* initialize fbdev helper */
msm_fbdev_setup(struct drm_device * dev)227 void msm_fbdev_setup(struct drm_device *dev)
228 {
229 struct drm_fb_helper *helper;
230 int ret;
231
232 if (!fbdev)
233 return;
234
235 drm_WARN(dev, !dev->registered, "Device has not been registered.\n");
236 drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n");
237
238 helper = kzalloc(sizeof(*helper), GFP_KERNEL);
239 if (!helper)
240 return;
241 drm_fb_helper_prepare(dev, helper, 32, &msm_fb_helper_funcs);
242
243 ret = drm_client_init(dev, &helper->client, "fbdev", &msm_fbdev_client_funcs);
244 if (ret) {
245 drm_err(dev, "Failed to register client: %d\n", ret);
246 goto err_drm_fb_helper_unprepare;
247 }
248
249 drm_client_register(&helper->client);
250
251 return;
252
253 err_drm_fb_helper_unprepare:
254 drm_fb_helper_unprepare(helper);
255 kfree(helper);
256 }
257