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