1 // SPDX-License-Identifier: GPL-2.0-or-later
3 drm_edid_load.c: use a built-in EDID data set or load it via the firmware
6 Copyright (C) 2012 Carsten Emde <C.Emde@osadl.org>
10 #include <linux/firmware.h>
11 #include <linux/module.h>
12 #include <linux/platform_device.h>
14 #include <drm/drm_crtc.h>
15 #include <drm/drm_crtc_helper.h>
16 #include <drm/drm_drv.h>
17 #include <drm/drm_edid.h>
18 #include <drm/drm_print.h>
20 static char edid_firmware[PATH_MAX];
21 module_param_string(edid_firmware, edid_firmware, sizeof(edid_firmware), 0644);
22 MODULE_PARM_DESC(edid_firmware, "Do not probe monitor, use specified EDID blob "
23 "from built-in data or /lib/firmware instead. ");
25 /* Use only for backward compatibility with drm_kms_helper.edid_firmware */
26 int __drm_set_edid_firmware_path(const char *path)
28 scnprintf(edid_firmware, sizeof(edid_firmware), "%s", path);
32 EXPORT_SYMBOL(__drm_set_edid_firmware_path);
34 /* Use only for backward compatibility with drm_kms_helper.edid_firmware */
35 int __drm_get_edid_firmware_path(char *buf, size_t bufsize)
37 return scnprintf(buf, bufsize, "%s", edid_firmware);
39 EXPORT_SYMBOL(__drm_get_edid_firmware_path);
41 #define GENERIC_EDIDS 6
42 static const char * const generic_edid_name[GENERIC_EDIDS] = {
51 static const u8 generic_edid[GENERIC_EDIDS][128] = {
53 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
54 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
55 0x05, 0x16, 0x01, 0x03, 0x6d, 0x1b, 0x14, 0x78,
56 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
57 0x20, 0x50, 0x54, 0x01, 0x00, 0x00, 0x45, 0x40,
58 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
59 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0xa0, 0x0f,
60 0x20, 0x00, 0x31, 0x58, 0x1c, 0x20, 0x28, 0x80,
61 0x14, 0x00, 0x15, 0xd0, 0x10, 0x00, 0x00, 0x1e,
62 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
63 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
64 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
65 0x3d, 0x24, 0x26, 0x05, 0x00, 0x0a, 0x20, 0x20,
66 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
67 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x53,
68 0x56, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0xc2,
71 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
72 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
73 0x05, 0x16, 0x01, 0x03, 0x6d, 0x23, 0x1a, 0x78,
74 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
75 0x20, 0x50, 0x54, 0x00, 0x08, 0x00, 0x61, 0x40,
76 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
77 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x64, 0x19,
78 0x00, 0x40, 0x41, 0x00, 0x26, 0x30, 0x08, 0x90,
79 0x36, 0x00, 0x63, 0x0a, 0x11, 0x00, 0x00, 0x18,
80 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
81 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
82 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
83 0x3d, 0x2f, 0x31, 0x07, 0x00, 0x0a, 0x20, 0x20,
84 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
85 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x58,
86 0x47, 0x41, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x55,
89 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
90 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
91 0x05, 0x16, 0x01, 0x03, 0x6d, 0x2c, 0x23, 0x78,
92 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
93 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0x81, 0x80,
94 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
95 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x30, 0x2a,
96 0x00, 0x98, 0x51, 0x00, 0x2a, 0x40, 0x30, 0x70,
97 0x13, 0x00, 0xbc, 0x63, 0x11, 0x00, 0x00, 0x1e,
98 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
99 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
100 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
101 0x3d, 0x3e, 0x40, 0x0b, 0x00, 0x0a, 0x20, 0x20,
102 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
103 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x53,
104 0x58, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0xa0,
107 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
108 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
109 0x05, 0x16, 0x01, 0x03, 0x6d, 0x37, 0x29, 0x78,
110 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
111 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xa9, 0x40,
112 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
113 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x48, 0x3f,
114 0x40, 0x30, 0x62, 0xb0, 0x32, 0x40, 0x40, 0xc0,
115 0x13, 0x00, 0x2b, 0xa0, 0x21, 0x00, 0x00, 0x1e,
116 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
117 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
118 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
119 0x3d, 0x4a, 0x4c, 0x11, 0x00, 0x0a, 0x20, 0x20,
120 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
121 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x55,
122 0x58, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0x9d,
125 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
126 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
127 0x05, 0x16, 0x01, 0x03, 0x6d, 0x2b, 0x1b, 0x78,
128 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
129 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xb3, 0x00,
130 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
131 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x21, 0x39,
132 0x90, 0x30, 0x62, 0x1a, 0x27, 0x40, 0x68, 0xb0,
133 0x36, 0x00, 0xb5, 0x11, 0x11, 0x00, 0x00, 0x1e,
134 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
135 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
136 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
137 0x3d, 0x40, 0x42, 0x0f, 0x00, 0x0a, 0x20, 0x20,
138 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
139 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x57,
140 0x53, 0x58, 0x47, 0x41, 0x0a, 0x20, 0x00, 0x26,
143 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
144 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
145 0x05, 0x16, 0x01, 0x03, 0x6d, 0x32, 0x1c, 0x78,
146 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
147 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xd1, 0xc0,
148 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
149 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x3a,
150 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c,
151 0x45, 0x00, 0xf4, 0x19, 0x11, 0x00, 0x00, 0x1e,
152 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
153 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
154 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
155 0x3d, 0x42, 0x44, 0x0f, 0x00, 0x0a, 0x20, 0x20,
156 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
157 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x46,
158 0x48, 0x44, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x05,
162 static int edid_size(const u8 *edid, int data_size)
164 if (data_size < EDID_LENGTH)
167 return (edid[0x7e] + 1) * EDID_LENGTH;
170 static void *edid_load(struct drm_connector *connector, const char *name,
171 const char *connector_name)
173 const struct firmware *fw = NULL;
177 int i, valid_extensions = 0;
178 bool print_bad_edid = !connector->bad_edid_counter || drm_debug_enabled(DRM_UT_KMS);
180 builtin = match_string(generic_edid_name, GENERIC_EDIDS, name);
182 fwdata = generic_edid[builtin];
183 fwsize = sizeof(generic_edid[builtin]);
185 struct platform_device *pdev;
188 pdev = platform_device_register_simple(connector_name, -1, NULL, 0);
190 DRM_ERROR("Failed to register EDID firmware platform device "
191 "for connector \"%s\"\n", connector_name);
192 return ERR_CAST(pdev);
195 err = request_firmware(&fw, name, &pdev->dev);
196 platform_device_unregister(pdev);
198 DRM_ERROR("Requesting EDID firmware \"%s\" failed (err=%d)\n",
207 if (edid_size(fwdata, fwsize) != fwsize) {
208 DRM_ERROR("Size of EDID firmware \"%s\" is invalid "
209 "(expected %d, got %d\n", name,
210 edid_size(fwdata, fwsize), (int)fwsize);
211 edid = ERR_PTR(-EINVAL);
215 edid = kmemdup(fwdata, fwsize, GFP_KERNEL);
217 edid = ERR_PTR(-ENOMEM);
221 if (!drm_edid_block_valid(edid, 0, print_bad_edid,
222 &connector->edid_corrupt)) {
223 connector->bad_edid_counter++;
224 DRM_ERROR("Base block of EDID firmware \"%s\" is invalid ",
227 edid = ERR_PTR(-EINVAL);
231 for (i = 1; i <= edid[0x7e]; i++) {
232 if (i != valid_extensions + 1)
233 memcpy(edid + (valid_extensions + 1) * EDID_LENGTH,
234 edid + i * EDID_LENGTH, EDID_LENGTH);
235 if (drm_edid_block_valid(edid + i * EDID_LENGTH, i,
241 if (valid_extensions != edid[0x7e]) {
244 edid[EDID_LENGTH-1] += edid[0x7e] - valid_extensions;
245 DRM_INFO("Found %d valid extensions instead of %d in EDID data "
246 "\"%s\" for connector \"%s\"\n", valid_extensions,
247 edid[0x7e], name, connector_name);
248 edid[0x7e] = valid_extensions;
250 new_edid = krealloc(edid, (valid_extensions + 1) * EDID_LENGTH,
256 DRM_INFO("Got %s EDID base block and %d extension%s from "
257 "\"%s\" for connector \"%s\"\n", (builtin >= 0) ? "built-in" :
258 "external", valid_extensions, valid_extensions == 1 ? "" : "s",
259 name, connector_name);
262 release_firmware(fw);
266 struct edid *drm_load_edid_firmware(struct drm_connector *connector)
268 const char *connector_name = connector->name;
269 char *edidname, *last, *colon, *fwstr, *edidstr, *fallback = NULL;
272 if (edid_firmware[0] == '\0')
273 return ERR_PTR(-ENOENT);
276 * If there are multiple edid files specified and separated
277 * by commas, search through the list looking for one that
278 * matches the connector.
280 * If there's one or more that doesn't specify a connector, keep
281 * the last one found one as a fallback.
283 fwstr = kstrdup(edid_firmware, GFP_KERNEL);
285 return ERR_PTR(-ENOMEM);
288 while ((edidname = strsep(&edidstr, ","))) {
289 colon = strchr(edidname, ':');
291 if (strncmp(connector_name, edidname, colon - edidname))
293 edidname = colon + 1;
297 if (*edidname != '\0') /* corner case: multiple ',' */
304 return ERR_PTR(-ENOENT);
309 last = edidname + strlen(edidname) - 1;
313 edid = edid_load(connector, edidname, connector_name);