fb: adv7393: off by one in probe function
[deliverable/linux.git] / drivers / gpu / drm / rockchip / rockchip_drm_fb.c
1 /*
2 * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
3 * Author:Mark Yao <mark.yao@rock-chips.com>
4 *
5 * This software is licensed under the terms of the GNU General Public
6 * License version 2, as published by the Free Software Foundation, and
7 * may be copied, distributed, and modified under those terms.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15 #include <linux/kernel.h>
16 #include <drm/drm.h>
17 #include <drm/drmP.h>
18 #include <drm/drm_atomic.h>
19 #include <drm/drm_fb_helper.h>
20 #include <drm/drm_crtc_helper.h>
21
22 #include "rockchip_drm_drv.h"
23 #include "rockchip_drm_fb.h"
24 #include "rockchip_drm_gem.h"
25
26 #define to_rockchip_fb(x) container_of(x, struct rockchip_drm_fb, fb)
27
28 struct rockchip_drm_fb {
29 struct drm_framebuffer fb;
30 struct drm_gem_object *obj[ROCKCHIP_MAX_FB_BUFFER];
31 };
32
33 struct drm_gem_object *rockchip_fb_get_gem_obj(struct drm_framebuffer *fb,
34 unsigned int plane)
35 {
36 struct rockchip_drm_fb *rk_fb = to_rockchip_fb(fb);
37
38 if (plane >= ROCKCHIP_MAX_FB_BUFFER)
39 return NULL;
40
41 return rk_fb->obj[plane];
42 }
43
44 static void rockchip_drm_fb_destroy(struct drm_framebuffer *fb)
45 {
46 struct rockchip_drm_fb *rockchip_fb = to_rockchip_fb(fb);
47 int i;
48
49 for (i = 0; i < ROCKCHIP_MAX_FB_BUFFER; i++)
50 drm_gem_object_unreference_unlocked(rockchip_fb->obj[i]);
51
52 drm_framebuffer_cleanup(fb);
53 kfree(rockchip_fb);
54 }
55
56 static int rockchip_drm_fb_create_handle(struct drm_framebuffer *fb,
57 struct drm_file *file_priv,
58 unsigned int *handle)
59 {
60 struct rockchip_drm_fb *rockchip_fb = to_rockchip_fb(fb);
61
62 return drm_gem_handle_create(file_priv,
63 rockchip_fb->obj[0], handle);
64 }
65
66 static const struct drm_framebuffer_funcs rockchip_drm_fb_funcs = {
67 .destroy = rockchip_drm_fb_destroy,
68 .create_handle = rockchip_drm_fb_create_handle,
69 };
70
71 static struct rockchip_drm_fb *
72 rockchip_fb_alloc(struct drm_device *dev, const struct drm_mode_fb_cmd2 *mode_cmd,
73 struct drm_gem_object **obj, unsigned int num_planes)
74 {
75 struct rockchip_drm_fb *rockchip_fb;
76 int ret;
77 int i;
78
79 rockchip_fb = kzalloc(sizeof(*rockchip_fb), GFP_KERNEL);
80 if (!rockchip_fb)
81 return ERR_PTR(-ENOMEM);
82
83 drm_helper_mode_fill_fb_struct(&rockchip_fb->fb, mode_cmd);
84
85 for (i = 0; i < num_planes; i++)
86 rockchip_fb->obj[i] = obj[i];
87
88 ret = drm_framebuffer_init(dev, &rockchip_fb->fb,
89 &rockchip_drm_fb_funcs);
90 if (ret) {
91 dev_err(dev->dev, "Failed to initialize framebuffer: %d\n",
92 ret);
93 kfree(rockchip_fb);
94 return ERR_PTR(ret);
95 }
96
97 return rockchip_fb;
98 }
99
100 static struct drm_framebuffer *
101 rockchip_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
102 const struct drm_mode_fb_cmd2 *mode_cmd)
103 {
104 struct rockchip_drm_fb *rockchip_fb;
105 struct drm_gem_object *objs[ROCKCHIP_MAX_FB_BUFFER];
106 struct drm_gem_object *obj;
107 unsigned int hsub;
108 unsigned int vsub;
109 int num_planes;
110 int ret;
111 int i;
112
113 hsub = drm_format_horz_chroma_subsampling(mode_cmd->pixel_format);
114 vsub = drm_format_vert_chroma_subsampling(mode_cmd->pixel_format);
115 num_planes = min(drm_format_num_planes(mode_cmd->pixel_format),
116 ROCKCHIP_MAX_FB_BUFFER);
117
118 for (i = 0; i < num_planes; i++) {
119 unsigned int width = mode_cmd->width / (i ? hsub : 1);
120 unsigned int height = mode_cmd->height / (i ? vsub : 1);
121 unsigned int min_size;
122
123 obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[i]);
124 if (!obj) {
125 dev_err(dev->dev, "Failed to lookup GEM object\n");
126 ret = -ENXIO;
127 goto err_gem_object_unreference;
128 }
129
130 min_size = (height - 1) * mode_cmd->pitches[i] +
131 mode_cmd->offsets[i] +
132 width * drm_format_plane_cpp(mode_cmd->pixel_format, i);
133
134 if (obj->size < min_size) {
135 drm_gem_object_unreference_unlocked(obj);
136 ret = -EINVAL;
137 goto err_gem_object_unreference;
138 }
139 objs[i] = obj;
140 }
141
142 rockchip_fb = rockchip_fb_alloc(dev, mode_cmd, objs, i);
143 if (IS_ERR(rockchip_fb)) {
144 ret = PTR_ERR(rockchip_fb);
145 goto err_gem_object_unreference;
146 }
147
148 return &rockchip_fb->fb;
149
150 err_gem_object_unreference:
151 for (i--; i >= 0; i--)
152 drm_gem_object_unreference_unlocked(objs[i]);
153 return ERR_PTR(ret);
154 }
155
156 static void rockchip_drm_output_poll_changed(struct drm_device *dev)
157 {
158 struct rockchip_drm_private *private = dev->dev_private;
159 struct drm_fb_helper *fb_helper = &private->fbdev_helper;
160
161 if (fb_helper)
162 drm_fb_helper_hotplug_event(fb_helper);
163 }
164
165 static void rockchip_crtc_wait_for_update(struct drm_crtc *crtc)
166 {
167 struct rockchip_drm_private *priv = crtc->dev->dev_private;
168 int pipe = drm_crtc_index(crtc);
169 const struct rockchip_crtc_funcs *crtc_funcs = priv->crtc_funcs[pipe];
170
171 if (crtc_funcs && crtc_funcs->wait_for_update)
172 crtc_funcs->wait_for_update(crtc);
173 }
174
175 /*
176 * We can't use drm_atomic_helper_wait_for_vblanks() because rk3288 and rk3066
177 * have hardware counters for neither vblanks nor scanlines, which results in
178 * a race where:
179 * | <-- HW vsync irq and reg take effect
180 * plane_commit --> |
181 * get_vblank and wait --> |
182 * | <-- handle_vblank, vblank->count + 1
183 * cleanup_fb --> |
184 * iommu crash --> |
185 * | <-- HW vsync irq and reg take effect
186 *
187 * This function is equivalent but uses rockchip_crtc_wait_for_update() instead
188 * of waiting for vblank_count to change.
189 */
190 static void
191 rockchip_atomic_wait_for_complete(struct drm_device *dev, struct drm_atomic_state *old_state)
192 {
193 struct drm_crtc_state *old_crtc_state;
194 struct drm_crtc *crtc;
195 int i, ret;
196
197 for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
198 /* No one cares about the old state, so abuse it for tracking
199 * and store whether we hold a vblank reference (and should do a
200 * vblank wait) in the ->enable boolean.
201 */
202 old_crtc_state->enable = false;
203
204 if (!crtc->state->active)
205 continue;
206
207 if (!drm_atomic_helper_framebuffer_changed(dev,
208 old_state, crtc))
209 continue;
210
211 ret = drm_crtc_vblank_get(crtc);
212 if (ret != 0)
213 continue;
214
215 old_crtc_state->enable = true;
216 }
217
218 for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
219 if (!old_crtc_state->enable)
220 continue;
221
222 rockchip_crtc_wait_for_update(crtc);
223 drm_crtc_vblank_put(crtc);
224 }
225 }
226
227 static void
228 rockchip_atomic_commit_tail(struct drm_atomic_state *state)
229 {
230 struct drm_device *dev = state->dev;
231
232 drm_atomic_helper_commit_modeset_disables(dev, state);
233
234 drm_atomic_helper_commit_modeset_enables(dev, state);
235
236 drm_atomic_helper_commit_planes(dev, state, true);
237
238 drm_atomic_helper_commit_hw_done(state);
239
240 rockchip_atomic_wait_for_complete(dev, state);
241
242 drm_atomic_helper_cleanup_planes(dev, state);
243 }
244
245 static struct drm_mode_config_helper_funcs rockchip_mode_config_helpers = {
246 .atomic_commit_tail = rockchip_atomic_commit_tail,
247 };
248
249 static const struct drm_mode_config_funcs rockchip_drm_mode_config_funcs = {
250 .fb_create = rockchip_user_fb_create,
251 .output_poll_changed = rockchip_drm_output_poll_changed,
252 .atomic_check = drm_atomic_helper_check,
253 .atomic_commit = drm_atomic_helper_commit,
254 };
255
256 struct drm_framebuffer *
257 rockchip_drm_framebuffer_init(struct drm_device *dev,
258 const struct drm_mode_fb_cmd2 *mode_cmd,
259 struct drm_gem_object *obj)
260 {
261 struct rockchip_drm_fb *rockchip_fb;
262
263 rockchip_fb = rockchip_fb_alloc(dev, mode_cmd, &obj, 1);
264 if (IS_ERR(rockchip_fb))
265 return NULL;
266
267 return &rockchip_fb->fb;
268 }
269
270 void rockchip_drm_mode_config_init(struct drm_device *dev)
271 {
272 dev->mode_config.min_width = 0;
273 dev->mode_config.min_height = 0;
274
275 /*
276 * set max width and height as default value(4096x4096).
277 * this value would be used to check framebuffer size limitation
278 * at drm_mode_addfb().
279 */
280 dev->mode_config.max_width = 4096;
281 dev->mode_config.max_height = 4096;
282
283 dev->mode_config.funcs = &rockchip_drm_mode_config_funcs;
284 dev->mode_config.helper_private = &rockchip_mode_config_helpers;
285 }
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