2 drm_edid_load.c: use a built-in EDID data set or load it via the firmware
5 Copyright (C) 2012 Carsten Emde <C.Emde@osadl.org>
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.
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.
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.
22 #include <linux/module.h>
23 #include <linux/firmware.h>
25 #include <drm/drm_crtc.h>
26 #include <drm/drm_crtc_helper.h>
27 #include <drm/drm_edid.h>
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. ");
34 #define GENERIC_EDIDS 6
35 static const char *generic_edid_name
[GENERIC_EDIDS
] = {
44 static const u8 generic_edid
[GENERIC_EDIDS
][128] = {
46 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
47 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
48 0x05, 0x16, 0x01, 0x03, 0x6d, 0x1b, 0x14, 0x78,
49 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
50 0x20, 0x50, 0x54, 0x01, 0x00, 0x00, 0x45, 0x40,
51 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
52 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0xa0, 0x0f,
53 0x20, 0x00, 0x31, 0x58, 0x1c, 0x20, 0x28, 0x80,
54 0x14, 0x00, 0x15, 0xd0, 0x10, 0x00, 0x00, 0x1e,
55 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
56 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
57 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
58 0x3d, 0x24, 0x26, 0x05, 0x00, 0x0a, 0x20, 0x20,
59 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
60 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x53,
61 0x56, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0xc2,
64 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
65 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
66 0x05, 0x16, 0x01, 0x03, 0x6d, 0x23, 0x1a, 0x78,
67 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
68 0x20, 0x50, 0x54, 0x00, 0x08, 0x00, 0x61, 0x40,
69 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
70 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x64, 0x19,
71 0x00, 0x40, 0x41, 0x00, 0x26, 0x30, 0x08, 0x90,
72 0x36, 0x00, 0x63, 0x0a, 0x11, 0x00, 0x00, 0x18,
73 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
74 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
75 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
76 0x3d, 0x2f, 0x31, 0x07, 0x00, 0x0a, 0x20, 0x20,
77 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
78 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x58,
79 0x47, 0x41, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x55,
82 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
83 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
84 0x05, 0x16, 0x01, 0x03, 0x6d, 0x2c, 0x23, 0x78,
85 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
86 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0x81, 0x80,
87 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
88 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x30, 0x2a,
89 0x00, 0x98, 0x51, 0x00, 0x2a, 0x40, 0x30, 0x70,
90 0x13, 0x00, 0xbc, 0x63, 0x11, 0x00, 0x00, 0x1e,
91 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
92 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
93 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
94 0x3d, 0x3e, 0x40, 0x0b, 0x00, 0x0a, 0x20, 0x20,
95 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
96 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x53,
97 0x58, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0xa0,
100 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
101 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
102 0x05, 0x16, 0x01, 0x03, 0x6d, 0x37, 0x29, 0x78,
103 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
104 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xa9, 0x40,
105 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
106 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x48, 0x3f,
107 0x40, 0x30, 0x62, 0xb0, 0x32, 0x40, 0x40, 0xc0,
108 0x13, 0x00, 0x2b, 0xa0, 0x21, 0x00, 0x00, 0x1e,
109 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
110 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
111 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
112 0x3d, 0x4a, 0x4c, 0x11, 0x00, 0x0a, 0x20, 0x20,
113 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
114 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x55,
115 0x58, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0x9d,
118 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
119 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
120 0x05, 0x16, 0x01, 0x03, 0x6d, 0x2b, 0x1b, 0x78,
121 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
122 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xb3, 0x00,
123 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
124 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x21, 0x39,
125 0x90, 0x30, 0x62, 0x1a, 0x27, 0x40, 0x68, 0xb0,
126 0x36, 0x00, 0xb5, 0x11, 0x11, 0x00, 0x00, 0x1e,
127 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
128 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
129 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
130 0x3d, 0x40, 0x42, 0x0f, 0x00, 0x0a, 0x20, 0x20,
131 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
132 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x57,
133 0x53, 0x58, 0x47, 0x41, 0x0a, 0x20, 0x00, 0x26,
136 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
137 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
138 0x05, 0x16, 0x01, 0x03, 0x6d, 0x32, 0x1c, 0x78,
139 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
140 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xd1, 0xc0,
141 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
142 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x3a,
143 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c,
144 0x45, 0x00, 0xf4, 0x19, 0x11, 0x00, 0x00, 0x1e,
145 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
146 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
147 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
148 0x3d, 0x42, 0x44, 0x0f, 0x00, 0x0a, 0x20, 0x20,
149 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
150 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x46,
151 0x48, 0x44, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x05,
155 static int edid_size(const u8
*edid
, int data_size
)
157 if (data_size
< EDID_LENGTH
)
160 return (edid
[0x7e] + 1) * EDID_LENGTH
;
163 static void *edid_load(struct drm_connector
*connector
, const char *name
,
164 const char *connector_name
)
166 const struct firmware
*fw
= NULL
;
170 int i
, valid_extensions
= 0;
171 bool print_bad_edid
= !connector
->bad_edid_counter
|| (drm_debug
& DRM_UT_KMS
);
174 for (i
= 0; i
< GENERIC_EDIDS
; i
++) {
175 if (strcmp(name
, generic_edid_name
[i
]) == 0) {
176 fwdata
= generic_edid
[i
];
177 fwsize
= sizeof(generic_edid
[i
]);
183 struct platform_device
*pdev
;
186 pdev
= platform_device_register_simple(connector_name
, -1, NULL
, 0);
188 DRM_ERROR("Failed to register EDID firmware platform device "
189 "for connector \"%s\"\n", connector_name
);
190 return ERR_CAST(pdev
);
193 err
= request_firmware(&fw
, name
, &pdev
->dev
);
194 platform_device_unregister(pdev
);
196 DRM_ERROR("Requesting EDID firmware \"%s\" failed (err=%d)\n",
205 if (edid_size(fwdata
, fwsize
) != fwsize
) {
206 DRM_ERROR("Size of EDID firmware \"%s\" is invalid "
207 "(expected %d, got %d\n", name
,
208 edid_size(fwdata
, fwsize
), (int)fwsize
);
209 edid
= ERR_PTR(-EINVAL
);
213 edid
= kmemdup(fwdata
, fwsize
, GFP_KERNEL
);
215 edid
= ERR_PTR(-ENOMEM
);
219 if (!drm_edid_block_valid(edid
, 0, print_bad_edid
)) {
220 connector
->bad_edid_counter
++;
221 DRM_ERROR("Base block of EDID firmware \"%s\" is invalid ",
224 edid
= ERR_PTR(-EINVAL
);
228 for (i
= 1; i
<= edid
[0x7e]; i
++) {
229 if (i
!= valid_extensions
+ 1)
230 memcpy(edid
+ (valid_extensions
+ 1) * EDID_LENGTH
,
231 edid
+ i
* EDID_LENGTH
, EDID_LENGTH
);
232 if (drm_edid_block_valid(edid
+ i
* EDID_LENGTH
, i
, print_bad_edid
))
236 if (valid_extensions
!= edid
[0x7e]) {
239 edid
[EDID_LENGTH
-1] += edid
[0x7e] - valid_extensions
;
240 DRM_INFO("Found %d valid extensions instead of %d in EDID data "
241 "\"%s\" for connector \"%s\"\n", valid_extensions
,
242 edid
[0x7e], name
, connector_name
);
243 edid
[0x7e] = valid_extensions
;
245 new_edid
= krealloc(edid
, (valid_extensions
+ 1) * EDID_LENGTH
,
251 DRM_INFO("Got %s EDID base block and %d extension%s from "
252 "\"%s\" for connector \"%s\"\n", builtin
? "built-in" :
253 "external", valid_extensions
, valid_extensions
== 1 ? "" : "s",
254 name
, connector_name
);
257 release_firmware(fw
);
261 int drm_load_edid_firmware(struct drm_connector
*connector
)
263 const char *connector_name
= connector
->name
;
264 char *edidname
= edid_firmware
, *last
, *colon
;
268 if (*edidname
== '\0')
271 colon
= strchr(edidname
, ':');
273 if (strncmp(connector_name
, edidname
, colon
- edidname
))
275 edidname
= colon
+ 1;
276 if (*edidname
== '\0')
280 last
= edidname
+ strlen(edidname
) - 1;
284 edid
= edid_load(connector
, edidname
, connector_name
);
285 if (IS_ERR_OR_NULL(edid
))
288 drm_mode_connector_update_edid_property(connector
, edid
);
289 ret
= drm_add_edid_modes(connector
, edid
);
290 drm_edid_to_eld(connector
, edid
);