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 "drmP.h"
25 #include "drm_crtc.h"
26 #include "drm_crtc_helper.h"
27 #include "drm_edid.h"
28
29 static char edid_firmware[PATH_MAX];
30 module_param_string(edid_firmware, edid_firmware, sizeof(edid_firmware), 0644);
31 MODULE_PARM_DESC(edid_firmware, "Do not probe monitor, use specified EDID blob "
32 "from built-in data or /lib/firmware instead. ");
33
34 #define GENERIC_EDIDS 4
35 static char *generic_edid_name[GENERIC_EDIDS] = {
36 "edid/1024x768.bin",
37 "edid/1280x1024.bin",
38 "edid/1680x1050.bin",
39 "edid/1920x1080.bin",
40 };
41
42 static u8 generic_edid[GENERIC_EDIDS][128] = {
43 {
44 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
45 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
46 0x05, 0x16, 0x01, 0x03, 0x6d, 0x23, 0x1a, 0x78,
47 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
48 0x20, 0x50, 0x54, 0x00, 0x08, 0x00, 0x61, 0x40,
49 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
50 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x64, 0x19,
51 0x00, 0x40, 0x41, 0x00, 0x26, 0x30, 0x08, 0x90,
52 0x36, 0x00, 0x63, 0x0a, 0x11, 0x00, 0x00, 0x18,
53 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
54 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
55 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
56 0x3d, 0x2f, 0x31, 0x07, 0x00, 0x0a, 0x20, 0x20,
57 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
58 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x58,
59 0x47, 0x41, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x55,
60 },
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, 0x2c, 0x23, 0x78,
65 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
66 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0x81, 0x80,
67 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
68 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x30, 0x2a,
69 0x00, 0x98, 0x51, 0x00, 0x2a, 0x40, 0x30, 0x70,
70 0x13, 0x00, 0xbc, 0x63, 0x11, 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, 0x3e, 0x40, 0x0b, 0x00, 0x0a, 0x20, 0x20,
75 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
76 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x53,
77 0x58, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0xa0,
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, 0x2b, 0x1b, 0x78,
83 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
84 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xb3, 0x00,
85 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
86 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x21, 0x39,
87 0x90, 0x30, 0x62, 0x1a, 0x27, 0x40, 0x68, 0xb0,
88 0x36, 0x00, 0xb5, 0x11, 0x11, 0x00, 0x00, 0x1e,
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, 0x40, 0x42, 0x0f, 0x00, 0x0a, 0x20, 0x20,
93 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
94 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x57,
95 0x53, 0x58, 0x47, 0x41, 0x0a, 0x20, 0x00, 0x26,
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, 0x32, 0x1c, 0x78,
101 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
102 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xd1, 0xc0,
103 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
104 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x3a,
105 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c,
106 0x45, 0x00, 0xf4, 0x19, 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, 0x42, 0x44, 0x0f, 0x00, 0x0a, 0x20, 0x20,
111 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
112 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x46,
113 0x48, 0x44, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x05,
114 },
115 };
116
edid_load(struct drm_connector * connector,char * name,char * connector_name)117 static int edid_load(struct drm_connector *connector, char *name,
118 char *connector_name)
119 {
120 const struct firmware *fw;
121 struct platform_device *pdev;
122 u8 *fwdata = NULL, *edid;
123 int fwsize, expected;
124 int builtin = 0, err = 0;
125 int i, valid_extensions = 0;
126
127 pdev = platform_device_register_simple(connector_name, -1, NULL, 0);
128 if (IS_ERR(pdev)) {
129 DRM_ERROR("Failed to register EDID firmware platform device "
130 "for connector \"%s\"\n", connector_name);
131 err = -EINVAL;
132 goto out;
133 }
134
135 err = request_firmware(&fw, name, &pdev->dev);
136 platform_device_unregister(pdev);
137
138 if (err) {
139 i = 0;
140 while (i < GENERIC_EDIDS && strcmp(name, generic_edid_name[i]))
141 i++;
142 if (i < GENERIC_EDIDS) {
143 err = 0;
144 builtin = 1;
145 fwdata = generic_edid[i];
146 fwsize = sizeof(generic_edid[i]);
147 }
148 }
149
150 if (err) {
151 DRM_ERROR("Requesting EDID firmware \"%s\" failed (err=%d)\n",
152 name, err);
153 goto out;
154 }
155
156 if (fwdata == NULL) {
157 fwdata = (u8 *) fw->data;
158 fwsize = fw->size;
159 }
160
161 expected = (fwdata[0x7e] + 1) * EDID_LENGTH;
162 if (expected != fwsize) {
163 DRM_ERROR("Size of EDID firmware \"%s\" is invalid "
164 "(expected %d, got %d)\n", name, expected, (int) fwsize);
165 err = -EINVAL;
166 goto relfw_out;
167 }
168
169 edid = kmalloc(fwsize, GFP_KERNEL);
170 if (edid == NULL) {
171 err = -ENOMEM;
172 goto relfw_out;
173 }
174 memcpy(edid, fwdata, fwsize);
175
176 if (!drm_edid_block_valid(edid)) {
177 DRM_ERROR("Base block of EDID firmware \"%s\" is invalid ",
178 name);
179 kfree(edid);
180 err = -EINVAL;
181 goto relfw_out;
182 }
183
184 for (i = 1; i <= edid[0x7e]; i++) {
185 if (i != valid_extensions + 1)
186 memcpy(edid + (valid_extensions + 1) * EDID_LENGTH,
187 edid + i * EDID_LENGTH, EDID_LENGTH);
188 if (drm_edid_block_valid(edid + i * EDID_LENGTH))
189 valid_extensions++;
190 }
191
192 if (valid_extensions != edid[0x7e]) {
193 edid[EDID_LENGTH-1] += edid[0x7e] - valid_extensions;
194 DRM_INFO("Found %d valid extensions instead of %d in EDID data "
195 "\"%s\" for connector \"%s\"\n", valid_extensions,
196 edid[0x7e], name, connector_name);
197 edid[0x7e] = valid_extensions;
198 edid = krealloc(edid, (valid_extensions + 1) * EDID_LENGTH,
199 GFP_KERNEL);
200 if (edid == NULL) {
201 err = -ENOMEM;
202 goto relfw_out;
203 }
204 }
205
206 connector->display_info.raw_edid = edid;
207 DRM_INFO("Got %s EDID base block and %d extension%s from "
208 "\"%s\" for connector \"%s\"\n", builtin ? "built-in" :
209 "external", valid_extensions, valid_extensions == 1 ? "" : "s",
210 name, connector_name);
211
212 relfw_out:
213 release_firmware(fw);
214
215 out:
216 return err;
217 }
218
drm_load_edid_firmware(struct drm_connector * connector)219 int drm_load_edid_firmware(struct drm_connector *connector)
220 {
221 char *connector_name = drm_get_connector_name(connector);
222 char *edidname = edid_firmware, *last, *colon;
223 int ret = 0;
224
225 if (*edidname == '\0')
226 return ret;
227
228 colon = strchr(edidname, ':');
229 if (colon != NULL) {
230 if (strncmp(connector_name, edidname, colon - edidname))
231 return ret;
232 edidname = colon + 1;
233 if (*edidname == '\0')
234 return ret;
235 }
236
237 last = edidname + strlen(edidname) - 1;
238 if (*last == '\n')
239 *last = '\0';
240
241 ret = edid_load(connector, edidname, connector_name);
242 if (ret)
243 return 0;
244
245 drm_mode_connector_update_edid_property(connector,
246 (struct edid *) connector->display_info.raw_edid);
247
248 return drm_add_edid_modes(connector, (struct edid *)
249 connector->display_info.raw_edid);
250 }
251