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 = match_string(generic_edid_name, GENERIC_EDIDS, name); 174 if (builtin >= 0) { 175 fwdata = generic_edid[builtin]; 176 fwsize = sizeof(generic_edid[builtin]); 177 } else { 178 struct platform_device *pdev; 179 int err; 180 181 pdev = platform_device_register_simple(connector_name, -1, NULL, 0); 182 if (IS_ERR(pdev)) { 183 DRM_ERROR("Failed to register EDID firmware platform device " 184 "for connector \"%s\"\n", connector_name); 185 return ERR_CAST(pdev); 186 } 187 188 err = request_firmware(&fw, name, &pdev->dev); 189 platform_device_unregister(pdev); 190 if (err) { 191 DRM_ERROR("Requesting EDID firmware \"%s\" failed (err=%d)\n", 192 name, err); 193 return ERR_PTR(err); 194 } 195 196 fwdata = fw->data; 197 fwsize = fw->size; 198 } 199 200 if (edid_size(fwdata, fwsize) != fwsize) { 201 DRM_ERROR("Size of EDID firmware \"%s\" is invalid " 202 "(expected %d, got %d\n", name, 203 edid_size(fwdata, fwsize), (int)fwsize); 204 edid = ERR_PTR(-EINVAL); 205 goto out; 206 } 207 208 edid = kmemdup(fwdata, fwsize, GFP_KERNEL); 209 if (edid == NULL) { 210 edid = ERR_PTR(-ENOMEM); 211 goto out; 212 } 213 214 if (!drm_edid_block_valid(edid, 0, print_bad_edid, 215 &connector->edid_corrupt)) { 216 connector->bad_edid_counter++; 217 DRM_ERROR("Base block of EDID firmware \"%s\" is invalid ", 218 name); 219 kfree(edid); 220 edid = ERR_PTR(-EINVAL); 221 goto out; 222 } 223 224 for (i = 1; i <= edid[0x7e]; i++) { 225 if (i != valid_extensions + 1) 226 memcpy(edid + (valid_extensions + 1) * EDID_LENGTH, 227 edid + i * EDID_LENGTH, EDID_LENGTH); 228 if (drm_edid_block_valid(edid + i * EDID_LENGTH, i, 229 print_bad_edid, 230 NULL)) 231 valid_extensions++; 232 } 233 234 if (valid_extensions != edid[0x7e]) { 235 u8 *new_edid; 236 237 edid[EDID_LENGTH-1] += edid[0x7e] - valid_extensions; 238 DRM_INFO("Found %d valid extensions instead of %d in EDID data " 239 "\"%s\" for connector \"%s\"\n", valid_extensions, 240 edid[0x7e], name, connector_name); 241 edid[0x7e] = valid_extensions; 242 243 new_edid = krealloc(edid, (valid_extensions + 1) * EDID_LENGTH, 244 GFP_KERNEL); 245 if (new_edid) 246 edid = new_edid; 247 } 248 249 DRM_INFO("Got %s EDID base block and %d extension%s from " 250 "\"%s\" for connector \"%s\"\n", (builtin >= 0) ? "built-in" : 251 "external", valid_extensions, valid_extensions == 1 ? "" : "s", 252 name, connector_name); 253 254 out: 255 release_firmware(fw); 256 return edid; 257 } 258 259 int drm_load_edid_firmware(struct drm_connector *connector) 260 { 261 const char *connector_name = connector->name; 262 char *edidname, *last, *colon, *fwstr, *edidstr, *fallback = NULL; 263 int ret; 264 struct edid *edid; 265 266 if (edid_firmware[0] == '\0') 267 return 0; 268 269 /* 270 * If there are multiple edid files specified and separated 271 * by commas, search through the list looking for one that 272 * matches the connector. 273 * 274 * If there's one or more that doesn't specify a connector, keep 275 * the last one found one as a fallback. 276 */ 277 fwstr = kstrdup(edid_firmware, GFP_KERNEL); 278 edidstr = fwstr; 279 280 while ((edidname = strsep(&edidstr, ","))) { 281 colon = strchr(edidname, ':'); 282 if (colon != NULL) { 283 if (strncmp(connector_name, edidname, colon - edidname)) 284 continue; 285 edidname = colon + 1; 286 break; 287 } 288 289 if (*edidname != '\0') /* corner case: multiple ',' */ 290 fallback = edidname; 291 } 292 293 if (!edidname) { 294 if (!fallback) { 295 kfree(fwstr); 296 return 0; 297 } 298 edidname = fallback; 299 } 300 301 last = edidname + strlen(edidname) - 1; 302 if (*last == '\n') 303 *last = '\0'; 304 305 edid = edid_load(connector, edidname, connector_name); 306 kfree(fwstr); 307 308 if (IS_ERR_OR_NULL(edid)) 309 return 0; 310 311 drm_mode_connector_update_edid_property(connector, edid); 312 ret = drm_add_edid_modes(connector, edid); 313 drm_edid_to_eld(connector, edid); 314 kfree(edid); 315 316 return ret; 317 } 318