1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | drm_edid_load.c: use a built-in EDID data set or load it via the firmware |
4 | interface |
5 | |
6 | Copyright (C) 2012 Carsten Emde <C.Emde@osadl.org> |
7 | |
8 | */ |
9 | |
10 | #include <linux/firmware.h> |
11 | #include <linux/module.h> |
12 | #include <linux/platform_device.h> |
13 | |
14 | #include <drm/drm_connector.h> |
15 | #include <drm/drm_drv.h> |
16 | #include <drm/drm_edid.h> |
17 | #include <drm/drm_print.h> |
18 | |
19 | #include "drm_crtc_internal.h" |
20 | |
21 | static char edid_firmware[PATH_MAX]; |
22 | module_param_string(edid_firmware, edid_firmware, sizeof(edid_firmware), 0644); |
23 | MODULE_PARM_DESC(edid_firmware, "Do not probe monitor, use specified EDID blob " |
24 | "from built-in data or /lib/firmware instead. " ); |
25 | |
26 | /* Use only for backward compatibility with drm_kms_helper.edid_firmware */ |
27 | int __drm_set_edid_firmware_path(const char *path) |
28 | { |
29 | scnprintf(buf: edid_firmware, size: sizeof(edid_firmware), fmt: "%s" , path); |
30 | |
31 | return 0; |
32 | } |
33 | EXPORT_SYMBOL(__drm_set_edid_firmware_path); |
34 | |
35 | /* Use only for backward compatibility with drm_kms_helper.edid_firmware */ |
36 | int __drm_get_edid_firmware_path(char *buf, size_t bufsize) |
37 | { |
38 | return scnprintf(buf, size: bufsize, fmt: "%s" , edid_firmware); |
39 | } |
40 | EXPORT_SYMBOL(__drm_get_edid_firmware_path); |
41 | |
42 | #define GENERIC_EDIDS 6 |
43 | static const char * const generic_edid_name[GENERIC_EDIDS] = { |
44 | "edid/800x600.bin" , |
45 | "edid/1024x768.bin" , |
46 | "edid/1280x1024.bin" , |
47 | "edid/1600x1200.bin" , |
48 | "edid/1680x1050.bin" , |
49 | "edid/1920x1080.bin" , |
50 | }; |
51 | |
52 | static const u8 generic_edid[GENERIC_EDIDS][128] = { |
53 | { |
54 | 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, |
55 | 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
56 | 0x05, 0x16, 0x01, 0x03, 0x6d, 0x1b, 0x14, 0x78, |
57 | 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25, |
58 | 0x20, 0x50, 0x54, 0x01, 0x00, 0x00, 0x45, 0x40, |
59 | 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, |
60 | 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0xa0, 0x0f, |
61 | 0x20, 0x00, 0x31, 0x58, 0x1c, 0x20, 0x28, 0x80, |
62 | 0x14, 0x00, 0x15, 0xd0, 0x10, 0x00, 0x00, 0x1e, |
63 | 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e, |
64 | 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20, |
65 | 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b, |
66 | 0x3d, 0x24, 0x26, 0x05, 0x00, 0x0a, 0x20, 0x20, |
67 | 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, |
68 | 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x53, |
69 | 0x56, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0xc2, |
70 | }, |
71 | { |
72 | 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, |
73 | 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
74 | 0x05, 0x16, 0x01, 0x03, 0x6d, 0x23, 0x1a, 0x78, |
75 | 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25, |
76 | 0x20, 0x50, 0x54, 0x00, 0x08, 0x00, 0x61, 0x40, |
77 | 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, |
78 | 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x64, 0x19, |
79 | 0x00, 0x40, 0x41, 0x00, 0x26, 0x30, 0x08, 0x90, |
80 | 0x36, 0x00, 0x63, 0x0a, 0x11, 0x00, 0x00, 0x18, |
81 | 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e, |
82 | 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20, |
83 | 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b, |
84 | 0x3d, 0x2f, 0x31, 0x07, 0x00, 0x0a, 0x20, 0x20, |
85 | 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, |
86 | 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x58, |
87 | 0x47, 0x41, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x55, |
88 | }, |
89 | { |
90 | 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, |
91 | 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
92 | 0x05, 0x16, 0x01, 0x03, 0x6d, 0x2c, 0x23, 0x78, |
93 | 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25, |
94 | 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0x81, 0x80, |
95 | 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, |
96 | 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x30, 0x2a, |
97 | 0x00, 0x98, 0x51, 0x00, 0x2a, 0x40, 0x30, 0x70, |
98 | 0x13, 0x00, 0xbc, 0x63, 0x11, 0x00, 0x00, 0x1e, |
99 | 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e, |
100 | 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20, |
101 | 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b, |
102 | 0x3d, 0x3e, 0x40, 0x0b, 0x00, 0x0a, 0x20, 0x20, |
103 | 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, |
104 | 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x53, |
105 | 0x58, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0xa0, |
106 | }, |
107 | { |
108 | 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, |
109 | 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
110 | 0x05, 0x16, 0x01, 0x03, 0x6d, 0x37, 0x29, 0x78, |
111 | 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25, |
112 | 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xa9, 0x40, |
113 | 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, |
114 | 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x48, 0x3f, |
115 | 0x40, 0x30, 0x62, 0xb0, 0x32, 0x40, 0x40, 0xc0, |
116 | 0x13, 0x00, 0x2b, 0xa0, 0x21, 0x00, 0x00, 0x1e, |
117 | 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e, |
118 | 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20, |
119 | 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b, |
120 | 0x3d, 0x4a, 0x4c, 0x11, 0x00, 0x0a, 0x20, 0x20, |
121 | 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, |
122 | 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x55, |
123 | 0x58, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0x9d, |
124 | }, |
125 | { |
126 | 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, |
127 | 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
128 | 0x05, 0x16, 0x01, 0x03, 0x6d, 0x2b, 0x1b, 0x78, |
129 | 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25, |
130 | 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xb3, 0x00, |
131 | 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, |
132 | 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x21, 0x39, |
133 | 0x90, 0x30, 0x62, 0x1a, 0x27, 0x40, 0x68, 0xb0, |
134 | 0x36, 0x00, 0xb5, 0x11, 0x11, 0x00, 0x00, 0x1e, |
135 | 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e, |
136 | 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20, |
137 | 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b, |
138 | 0x3d, 0x40, 0x42, 0x0f, 0x00, 0x0a, 0x20, 0x20, |
139 | 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, |
140 | 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x57, |
141 | 0x53, 0x58, 0x47, 0x41, 0x0a, 0x20, 0x00, 0x26, |
142 | }, |
143 | { |
144 | 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, |
145 | 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
146 | 0x05, 0x16, 0x01, 0x03, 0x6d, 0x32, 0x1c, 0x78, |
147 | 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25, |
148 | 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xd1, 0xc0, |
149 | 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, |
150 | 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x3a, |
151 | 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c, |
152 | 0x45, 0x00, 0xf4, 0x19, 0x11, 0x00, 0x00, 0x1e, |
153 | 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e, |
154 | 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20, |
155 | 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b, |
156 | 0x3d, 0x42, 0x44, 0x0f, 0x00, 0x0a, 0x20, 0x20, |
157 | 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, |
158 | 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x46, |
159 | 0x48, 0x44, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x05, |
160 | }, |
161 | }; |
162 | |
163 | static const struct drm_edid *edid_load(struct drm_connector *connector, const char *name) |
164 | { |
165 | const struct firmware *fw = NULL; |
166 | const u8 *fwdata; |
167 | const struct drm_edid *drm_edid; |
168 | int fwsize, builtin; |
169 | |
170 | builtin = match_string(array: generic_edid_name, GENERIC_EDIDS, string: name); |
171 | if (builtin >= 0) { |
172 | fwdata = generic_edid[builtin]; |
173 | fwsize = sizeof(generic_edid[builtin]); |
174 | } else { |
175 | int err; |
176 | |
177 | err = request_firmware(fw: &fw, name, device: connector->dev->dev); |
178 | if (err) { |
179 | drm_err(connector->dev, |
180 | "[CONNECTOR:%d:%s] Requesting EDID firmware \"%s\" failed (err=%d)\n" , |
181 | connector->base.id, connector->name, |
182 | name, err); |
183 | return ERR_PTR(error: err); |
184 | } |
185 | |
186 | fwdata = fw->data; |
187 | fwsize = fw->size; |
188 | } |
189 | |
190 | drm_dbg_kms(connector->dev, "[CONNECTOR:%d:%s] Loaded %s firmware EDID \"%s\"\n" , |
191 | connector->base.id, connector->name, |
192 | builtin >= 0 ? "built-in" : "external" , name); |
193 | |
194 | drm_edid = drm_edid_alloc(edid: fwdata, size: fwsize); |
195 | if (!drm_edid_valid(drm_edid)) { |
196 | drm_err(connector->dev, "Invalid firmware EDID \"%s\"\n" , name); |
197 | drm_edid_free(drm_edid); |
198 | drm_edid = ERR_PTR(error: -EINVAL); |
199 | } |
200 | |
201 | release_firmware(fw); |
202 | |
203 | return drm_edid; |
204 | } |
205 | |
206 | const struct drm_edid *drm_edid_load_firmware(struct drm_connector *connector) |
207 | { |
208 | char *edidname, *last, *colon, *fwstr, *edidstr, *fallback = NULL; |
209 | const struct drm_edid *drm_edid; |
210 | |
211 | if (edid_firmware[0] == '\0') |
212 | return ERR_PTR(error: -ENOENT); |
213 | |
214 | /* |
215 | * If there are multiple edid files specified and separated |
216 | * by commas, search through the list looking for one that |
217 | * matches the connector. |
218 | * |
219 | * If there's one or more that doesn't specify a connector, keep |
220 | * the last one found one as a fallback. |
221 | */ |
222 | fwstr = kstrdup(s: edid_firmware, GFP_KERNEL); |
223 | if (!fwstr) |
224 | return ERR_PTR(error: -ENOMEM); |
225 | edidstr = fwstr; |
226 | |
227 | while ((edidname = strsep(&edidstr, "," ))) { |
228 | colon = strchr(edidname, ':'); |
229 | if (colon != NULL) { |
230 | if (strncmp(connector->name, edidname, colon - edidname)) |
231 | continue; |
232 | edidname = colon + 1; |
233 | break; |
234 | } |
235 | |
236 | if (*edidname != '\0') /* corner case: multiple ',' */ |
237 | fallback = edidname; |
238 | } |
239 | |
240 | if (!edidname) { |
241 | if (!fallback) { |
242 | kfree(objp: fwstr); |
243 | return ERR_PTR(error: -ENOENT); |
244 | } |
245 | edidname = fallback; |
246 | } |
247 | |
248 | last = edidname + strlen(edidname) - 1; |
249 | if (*last == '\n') |
250 | *last = '\0'; |
251 | |
252 | drm_edid = edid_load(connector, name: edidname); |
253 | |
254 | kfree(objp: fwstr); |
255 | |
256 | return drm_edid; |
257 | } |
258 | |