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1/*
2 drm_edid_load.c: use a built-in EDID data set or load it via the firmware
3 interface
4
5 Copyright (C) 2012 Carsten Emde <C.Emde@osadl.org>
6
7 This program is free software; you can redistribute it and/or
8 modify it under the terms of the GNU General Public License
9 as published by the Free Software Foundation; either version 2
10 of the License, or (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20*/
21
22#include <linux/module.h>
23#include <linux/firmware.h>
24#include <drm/drmP.h>
25#include <drm/drm_crtc.h>
26#include <drm/drm_crtc_helper.h>
27#include <drm/drm_edid.h>
28
29static char edid_firmware[PATH_MAX];
30module_param_string(edid_firmware, edid_firmware, sizeof(edid_firmware), 0644);
31MODULE_PARM_DESC(edid_firmware, "Do not probe monitor, use specified EDID blob "
32 "from built-in data or /lib/firmware instead. ");
33
34/* Use only for backward compatibility with drm_kms_helper.edid_firmware */
35int __drm_set_edid_firmware_path(const char *path)
36{
37 scnprintf(edid_firmware, sizeof(edid_firmware), "%s", path);
38
39 return 0;
40}
41EXPORT_SYMBOL(__drm_set_edid_firmware_path);
42
43/* Use only for backward compatibility with drm_kms_helper.edid_firmware */
44int __drm_get_edid_firmware_path(char *buf, size_t bufsize)
45{
46 return scnprintf(buf, bufsize, "%s", edid_firmware);
47}
48EXPORT_SYMBOL(__drm_get_edid_firmware_path);
49
50#define GENERIC_EDIDS 6
51static const char * const generic_edid_name[GENERIC_EDIDS] = {
52 "edid/800x600.bin",
53 "edid/1024x768.bin",
54 "edid/1280x1024.bin",
55 "edid/1600x1200.bin",
56 "edid/1680x1050.bin",
57 "edid/1920x1080.bin",
58};
59
60static const u8 generic_edid[GENERIC_EDIDS][128] = {
61 {
62 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
63 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
64 0x05, 0x16, 0x01, 0x03, 0x6d, 0x1b, 0x14, 0x78,
65 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
66 0x20, 0x50, 0x54, 0x01, 0x00, 0x00, 0x45, 0x40,
67 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
68 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0xa0, 0x0f,
69 0x20, 0x00, 0x31, 0x58, 0x1c, 0x20, 0x28, 0x80,
70 0x14, 0x00, 0x15, 0xd0, 0x10, 0x00, 0x00, 0x1e,
71 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
72 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
73 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
74 0x3d, 0x24, 0x26, 0x05, 0x00, 0x0a, 0x20, 0x20,
75 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
76 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x53,
77 0x56, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0xc2,
78 },
79 {
80 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
81 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
82 0x05, 0x16, 0x01, 0x03, 0x6d, 0x23, 0x1a, 0x78,
83 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
84 0x20, 0x50, 0x54, 0x00, 0x08, 0x00, 0x61, 0x40,
85 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
86 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x64, 0x19,
87 0x00, 0x40, 0x41, 0x00, 0x26, 0x30, 0x08, 0x90,
88 0x36, 0x00, 0x63, 0x0a, 0x11, 0x00, 0x00, 0x18,
89 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
90 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
91 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
92 0x3d, 0x2f, 0x31, 0x07, 0x00, 0x0a, 0x20, 0x20,
93 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
94 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x58,
95 0x47, 0x41, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x55,
96 },
97 {
98 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
99 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
100 0x05, 0x16, 0x01, 0x03, 0x6d, 0x2c, 0x23, 0x78,
101 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
102 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0x81, 0x80,
103 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
104 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x30, 0x2a,
105 0x00, 0x98, 0x51, 0x00, 0x2a, 0x40, 0x30, 0x70,
106 0x13, 0x00, 0xbc, 0x63, 0x11, 0x00, 0x00, 0x1e,
107 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
108 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
109 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
110 0x3d, 0x3e, 0x40, 0x0b, 0x00, 0x0a, 0x20, 0x20,
111 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
112 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x53,
113 0x58, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0xa0,
114 },
115 {
116 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
117 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
118 0x05, 0x16, 0x01, 0x03, 0x6d, 0x37, 0x29, 0x78,
119 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
120 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xa9, 0x40,
121 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
122 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x48, 0x3f,
123 0x40, 0x30, 0x62, 0xb0, 0x32, 0x40, 0x40, 0xc0,
124 0x13, 0x00, 0x2b, 0xa0, 0x21, 0x00, 0x00, 0x1e,
125 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
126 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
127 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
128 0x3d, 0x4a, 0x4c, 0x11, 0x00, 0x0a, 0x20, 0x20,
129 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
130 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x55,
131 0x58, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0x9d,
132 },
133 {
134 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
135 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
136 0x05, 0x16, 0x01, 0x03, 0x6d, 0x2b, 0x1b, 0x78,
137 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
138 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xb3, 0x00,
139 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
140 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x21, 0x39,
141 0x90, 0x30, 0x62, 0x1a, 0x27, 0x40, 0x68, 0xb0,
142 0x36, 0x00, 0xb5, 0x11, 0x11, 0x00, 0x00, 0x1e,
143 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
144 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
145 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
146 0x3d, 0x40, 0x42, 0x0f, 0x00, 0x0a, 0x20, 0x20,
147 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
148 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x57,
149 0x53, 0x58, 0x47, 0x41, 0x0a, 0x20, 0x00, 0x26,
150 },
151 {
152 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
153 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
154 0x05, 0x16, 0x01, 0x03, 0x6d, 0x32, 0x1c, 0x78,
155 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
156 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xd1, 0xc0,
157 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
158 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x3a,
159 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c,
160 0x45, 0x00, 0xf4, 0x19, 0x11, 0x00, 0x00, 0x1e,
161 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
162 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
163 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
164 0x3d, 0x42, 0x44, 0x0f, 0x00, 0x0a, 0x20, 0x20,
165 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
166 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x46,
167 0x48, 0x44, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x05,
168 },
169};
170
171static int edid_size(const u8 *edid, int data_size)
172{
173 if (data_size < EDID_LENGTH)
174 return 0;
175
176 return (edid[0x7e] + 1) * EDID_LENGTH;
177}
178
179static void *edid_load(struct drm_connector *connector, const char *name,
180 const char *connector_name)
181{
182 const struct firmware *fw = NULL;
183 const u8 *fwdata;
184 u8 *edid;
185 int fwsize, builtin;
186 int i, valid_extensions = 0;
187 bool print_bad_edid = !connector->bad_edid_counter || (drm_debug & DRM_UT_KMS);
188
189 builtin = match_string(generic_edid_name, GENERIC_EDIDS, name);
190 if (builtin >= 0) {
191 fwdata = generic_edid[builtin];
192 fwsize = sizeof(generic_edid[builtin]);
193 } else {
194 struct platform_device *pdev;
195 int err;
196
197 pdev = platform_device_register_simple(connector_name, -1, NULL, 0);
198 if (IS_ERR(pdev)) {
199 DRM_ERROR("Failed to register EDID firmware platform device "
200 "for connector \"%s\"\n", connector_name);
201 return ERR_CAST(pdev);
202 }
203
204 err = request_firmware(&fw, name, &pdev->dev);
205 platform_device_unregister(pdev);
206 if (err) {
207 DRM_ERROR("Requesting EDID firmware \"%s\" failed (err=%d)\n",
208 name, err);
209 return ERR_PTR(err);
210 }
211
212 fwdata = fw->data;
213 fwsize = fw->size;
214 }
215
216 if (edid_size(fwdata, fwsize) != fwsize) {
217 DRM_ERROR("Size of EDID firmware \"%s\" is invalid "
218 "(expected %d, got %d\n", name,
219 edid_size(fwdata, fwsize), (int)fwsize);
220 edid = ERR_PTR(-EINVAL);
221 goto out;
222 }
223
224 edid = kmemdup(fwdata, fwsize, GFP_KERNEL);
225 if (edid == NULL) {
226 edid = ERR_PTR(-ENOMEM);
227 goto out;
228 }
229
230 if (!drm_edid_block_valid(edid, 0, print_bad_edid,
231 &connector->edid_corrupt)) {
232 connector->bad_edid_counter++;
233 DRM_ERROR("Base block of EDID firmware \"%s\" is invalid ",
234 name);
235 kfree(edid);
236 edid = ERR_PTR(-EINVAL);
237 goto out;
238 }
239
240 for (i = 1; i <= edid[0x7e]; i++) {
241 if (i != valid_extensions + 1)
242 memcpy(edid + (valid_extensions + 1) * EDID_LENGTH,
243 edid + i * EDID_LENGTH, EDID_LENGTH);
244 if (drm_edid_block_valid(edid + i * EDID_LENGTH, i,
245 print_bad_edid,
246 NULL))
247 valid_extensions++;
248 }
249
250 if (valid_extensions != edid[0x7e]) {
251 u8 *new_edid;
252
253 edid[EDID_LENGTH-1] += edid[0x7e] - valid_extensions;
254 DRM_INFO("Found %d valid extensions instead of %d in EDID data "
255 "\"%s\" for connector \"%s\"\n", valid_extensions,
256 edid[0x7e], name, connector_name);
257 edid[0x7e] = valid_extensions;
258
259 new_edid = krealloc(edid, (valid_extensions + 1) * EDID_LENGTH,
260 GFP_KERNEL);
261 if (new_edid)
262 edid = new_edid;
263 }
264
265 DRM_INFO("Got %s EDID base block and %d extension%s from "
266 "\"%s\" for connector \"%s\"\n", (builtin >= 0) ? "built-in" :
267 "external", valid_extensions, valid_extensions == 1 ? "" : "s",
268 name, connector_name);
269
270out:
271 release_firmware(fw);
272 return edid;
273}
274
275struct edid *drm_load_edid_firmware(struct drm_connector *connector)
276{
277 const char *connector_name = connector->name;
278 char *edidname, *last, *colon, *fwstr, *edidstr, *fallback = NULL;
279 struct edid *edid;
280
281 if (edid_firmware[0] == '\0')
282 return ERR_PTR(-ENOENT);
283
284 /*
285 * If there are multiple edid files specified and separated
286 * by commas, search through the list looking for one that
287 * matches the connector.
288 *
289 * If there's one or more that doesn't specify a connector, keep
290 * the last one found one as a fallback.
291 */
292 fwstr = kstrdup(edid_firmware, GFP_KERNEL);
293 edidstr = fwstr;
294
295 while ((edidname = strsep(&edidstr, ","))) {
296 colon = strchr(edidname, ':');
297 if (colon != NULL) {
298 if (strncmp(connector_name, edidname, colon - edidname))
299 continue;
300 edidname = colon + 1;
301 break;
302 }
303
304 if (*edidname != '\0') /* corner case: multiple ',' */
305 fallback = edidname;
306 }
307
308 if (!edidname) {
309 if (!fallback) {
310 kfree(fwstr);
311 return ERR_PTR(-ENOENT);
312 }
313 edidname = fallback;
314 }
315
316 last = edidname + strlen(edidname) - 1;
317 if (*last == '\n')
318 *last = '\0';
319
320 edid = edid_load(connector, edidname, connector_name);
321 kfree(fwstr);
322
323 return edid;
324}