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 <drm/drmP.h> 25 #include <drm/drm_crtc.h> 26 #include <drm/drm_crtc_helper.h> 27 #include <drm/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 6 35 static const char * const generic_edid_name[GENERIC_EDIDS] = { 36 "edid/800x600.bin", 37 "edid/1024x768.bin", 38 "edid/1280x1024.bin", 39 "edid/1600x1200.bin", 40 "edid/1680x1050.bin", 41 "edid/1920x1080.bin", 42 }; 43 44 static const u8 generic_edid[GENERIC_EDIDS][128] = { 45 { 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, 62 }, 63 { 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, 80 }, 81 { 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, 98 }, 99 { 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, 116 }, 117 { 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, 134 }, 135 { 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, 152 }, 153 }; 154 155 static int edid_size(const u8 *edid, int data_size) 156 { 157 if (data_size < EDID_LENGTH) 158 return 0; 159 160 return (edid[0x7e] + 1) * EDID_LENGTH; 161 } 162 163 static void *edid_load(struct drm_connector *connector, const char *name, 164 const char *connector_name) 165 { 166 const struct firmware *fw = NULL; 167 const u8 *fwdata; 168 u8 *edid; 169 int fwsize, builtin; 170 int i, valid_extensions = 0; 171 bool print_bad_edid = !connector->bad_edid_counter || (drm_debug & DRM_UT_KMS); 172 173 builtin = 0; 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]); 178 builtin = 1; 179 break; 180 } 181 } 182 if (!builtin) { 183 struct platform_device *pdev; 184 int err; 185 186 pdev = platform_device_register_simple(connector_name, -1, NULL, 0); 187 if (IS_ERR(pdev)) { 188 DRM_ERROR("Failed to register EDID firmware platform device " 189 "for connector \"%s\"\n", connector_name); 190 return ERR_CAST(pdev); 191 } 192 193 err = request_firmware(&fw, name, &pdev->dev); 194 platform_device_unregister(pdev); 195 if (err) { 196 DRM_ERROR("Requesting EDID firmware \"%s\" failed (err=%d)\n", 197 name, err); 198 return ERR_PTR(err); 199 } 200 201 fwdata = fw->data; 202 fwsize = fw->size; 203 } 204 205 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); 210 goto out; 211 } 212 213 edid = kmemdup(fwdata, fwsize, GFP_KERNEL); 214 if (edid == NULL) { 215 edid = ERR_PTR(-ENOMEM); 216 goto out; 217 } 218 219 if (!drm_edid_block_valid(edid, 0, print_bad_edid, 220 &connector->edid_corrupt)) { 221 connector->bad_edid_counter++; 222 DRM_ERROR("Base block of EDID firmware \"%s\" is invalid ", 223 name); 224 kfree(edid); 225 edid = ERR_PTR(-EINVAL); 226 goto out; 227 } 228 229 for (i = 1; i <= edid[0x7e]; i++) { 230 if (i != valid_extensions + 1) 231 memcpy(edid + (valid_extensions + 1) * EDID_LENGTH, 232 edid + i * EDID_LENGTH, EDID_LENGTH); 233 if (drm_edid_block_valid(edid + i * EDID_LENGTH, i, 234 print_bad_edid, 235 NULL)) 236 valid_extensions++; 237 } 238 239 if (valid_extensions != edid[0x7e]) { 240 u8 *new_edid; 241 242 edid[EDID_LENGTH-1] += edid[0x7e] - valid_extensions; 243 DRM_INFO("Found %d valid extensions instead of %d in EDID data " 244 "\"%s\" for connector \"%s\"\n", valid_extensions, 245 edid[0x7e], name, connector_name); 246 edid[0x7e] = valid_extensions; 247 248 new_edid = krealloc(edid, (valid_extensions + 1) * EDID_LENGTH, 249 GFP_KERNEL); 250 if (new_edid) 251 edid = new_edid; 252 } 253 254 DRM_INFO("Got %s EDID base block and %d extension%s from " 255 "\"%s\" for connector \"%s\"\n", builtin ? "built-in" : 256 "external", valid_extensions, valid_extensions == 1 ? "" : "s", 257 name, connector_name); 258 259 out: 260 release_firmware(fw); 261 return edid; 262 } 263 264 int drm_load_edid_firmware(struct drm_connector *connector) 265 { 266 const char *connector_name = connector->name; 267 char *edidname, *last, *colon, *fwstr, *edidstr, *fallback = NULL; 268 int ret; 269 struct edid *edid; 270 271 if (edid_firmware[0] == '\0') 272 return 0; 273 274 /* 275 * If there are multiple edid files specified and separated 276 * by commas, search through the list looking for one that 277 * matches the connector. 278 * 279 * If there's one or more that don't't specify a connector, keep 280 * the last one found one as a fallback. 281 */ 282 fwstr = kstrdup(edid_firmware, GFP_KERNEL); 283 edidstr = fwstr; 284 285 while ((edidname = strsep(&edidstr, ","))) { 286 colon = strchr(edidname, ':'); 287 if (colon != NULL) { 288 if (strncmp(connector_name, edidname, colon - edidname)) 289 continue; 290 edidname = colon + 1; 291 break; 292 } 293 294 if (*edidname != '\0') /* corner case: multiple ',' */ 295 fallback = edidname; 296 } 297 298 if (!edidname) { 299 if (!fallback) { 300 kfree(fwstr); 301 return 0; 302 } 303 edidname = fallback; 304 } 305 306 last = edidname + strlen(edidname) - 1; 307 if (*last == '\n') 308 *last = '\0'; 309 310 edid = edid_load(connector, edidname, connector_name); 311 kfree(fwstr); 312 313 if (IS_ERR_OR_NULL(edid)) 314 return 0; 315 316 drm_mode_connector_update_edid_property(connector, edid); 317 ret = drm_add_edid_modes(connector, edid); 318 drm_edid_to_eld(connector, edid); 319 kfree(edid); 320 321 return ret; 322 } 323