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_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> 19 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. "); 24 25 /* Use only for backward compatibility with drm_kms_helper.edid_firmware */ 26 int __drm_set_edid_firmware_path(const char *path) 27 { 28 scnprintf(edid_firmware, sizeof(edid_firmware), "%s", path); 29 30 return 0; 31 } 32 EXPORT_SYMBOL(__drm_set_edid_firmware_path); 33 34 /* Use only for backward compatibility with drm_kms_helper.edid_firmware */ 35 int __drm_get_edid_firmware_path(char *buf, size_t bufsize) 36 { 37 return scnprintf(buf, bufsize, "%s", edid_firmware); 38 } 39 EXPORT_SYMBOL(__drm_get_edid_firmware_path); 40 41 #define GENERIC_EDIDS 6 42 static const char * const generic_edid_name[GENERIC_EDIDS] = { 43 "edid/800x600.bin", 44 "edid/1024x768.bin", 45 "edid/1280x1024.bin", 46 "edid/1600x1200.bin", 47 "edid/1680x1050.bin", 48 "edid/1920x1080.bin", 49 }; 50 51 static const u8 generic_edid[GENERIC_EDIDS][128] = { 52 { 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, 69 }, 70 { 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, 87 }, 88 { 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, 105 }, 106 { 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, 123 }, 124 { 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, 141 }, 142 { 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, 159 }, 160 }; 161 162 static int edid_size(const u8 *edid, int data_size) 163 { 164 if (data_size < EDID_LENGTH) 165 return 0; 166 167 return (edid[0x7e] + 1) * EDID_LENGTH; 168 } 169 170 static void *edid_load(struct drm_connector *connector, const char *name, 171 const char *connector_name) 172 { 173 const struct firmware *fw = NULL; 174 const u8 *fwdata; 175 u8 *edid; 176 int fwsize, builtin; 177 int i, valid_extensions = 0; 178 bool print_bad_edid = !connector->bad_edid_counter || drm_debug_enabled(DRM_UT_KMS); 179 180 builtin = match_string(generic_edid_name, GENERIC_EDIDS, name); 181 if (builtin >= 0) { 182 fwdata = generic_edid[builtin]; 183 fwsize = sizeof(generic_edid[builtin]); 184 } else { 185 struct platform_device *pdev; 186 int err; 187 188 pdev = platform_device_register_simple(connector_name, -1, NULL, 0); 189 if (IS_ERR(pdev)) { 190 DRM_ERROR("Failed to register EDID firmware platform device " 191 "for connector \"%s\"\n", connector_name); 192 return ERR_CAST(pdev); 193 } 194 195 err = request_firmware(&fw, name, &pdev->dev); 196 platform_device_unregister(pdev); 197 if (err) { 198 DRM_ERROR("Requesting EDID firmware \"%s\" failed (err=%d)\n", 199 name, err); 200 return ERR_PTR(err); 201 } 202 203 fwdata = fw->data; 204 fwsize = fw->size; 205 } 206 207 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); 212 goto out; 213 } 214 215 edid = kmemdup(fwdata, fwsize, GFP_KERNEL); 216 if (edid == NULL) { 217 edid = ERR_PTR(-ENOMEM); 218 goto out; 219 } 220 221 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 ", 225 name); 226 kfree(edid); 227 edid = ERR_PTR(-EINVAL); 228 goto out; 229 } 230 231 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, 236 print_bad_edid, 237 NULL)) 238 valid_extensions++; 239 } 240 241 if (valid_extensions != edid[0x7e]) { 242 u8 *new_edid; 243 244 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; 249 250 new_edid = krealloc(edid, (valid_extensions + 1) * EDID_LENGTH, 251 GFP_KERNEL); 252 if (new_edid) 253 edid = new_edid; 254 } 255 256 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); 260 261 out: 262 release_firmware(fw); 263 return edid; 264 } 265 266 struct edid *drm_load_edid_firmware(struct drm_connector *connector) 267 { 268 const char *connector_name = connector->name; 269 char *edidname, *last, *colon, *fwstr, *edidstr, *fallback = NULL; 270 struct edid *edid; 271 272 if (edid_firmware[0] == '\0') 273 return ERR_PTR(-ENOENT); 274 275 /* 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. 279 * 280 * If there's one or more that doesn't specify a connector, keep 281 * the last one found one as a fallback. 282 */ 283 fwstr = kstrdup(edid_firmware, GFP_KERNEL); 284 if (!fwstr) 285 return ERR_PTR(-ENOMEM); 286 edidstr = fwstr; 287 288 while ((edidname = strsep(&edidstr, ","))) { 289 colon = strchr(edidname, ':'); 290 if (colon != NULL) { 291 if (strncmp(connector_name, edidname, colon - edidname)) 292 continue; 293 edidname = colon + 1; 294 break; 295 } 296 297 if (*edidname != '\0') /* corner case: multiple ',' */ 298 fallback = edidname; 299 } 300 301 if (!edidname) { 302 if (!fallback) { 303 kfree(fwstr); 304 return ERR_PTR(-ENOENT); 305 } 306 edidname = fallback; 307 } 308 309 last = edidname + strlen(edidname) - 1; 310 if (*last == '\n') 311 *last = '\0'; 312 313 edid = edid_load(connector, edidname, connector_name); 314 kfree(fwstr); 315 316 return edid; 317 } 318