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 5 35 static char *generic_edid_name[GENERIC_EDIDS] = { 36 "edid/1024x768.bin", 37 "edid/1280x1024.bin", 38 "edid/1600x1200.bin", 39 "edid/1680x1050.bin", 40 "edid/1920x1080.bin", 41 }; 42 43 static u8 generic_edid[GENERIC_EDIDS][128] = { 44 { 45 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 46 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 47 0x05, 0x16, 0x01, 0x03, 0x6d, 0x23, 0x1a, 0x78, 48 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25, 49 0x20, 0x50, 0x54, 0x00, 0x08, 0x00, 0x61, 0x40, 50 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 51 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x64, 0x19, 52 0x00, 0x40, 0x41, 0x00, 0x26, 0x30, 0x08, 0x90, 53 0x36, 0x00, 0x63, 0x0a, 0x11, 0x00, 0x00, 0x18, 54 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e, 55 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20, 56 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b, 57 0x3d, 0x2f, 0x31, 0x07, 0x00, 0x0a, 0x20, 0x20, 58 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, 59 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x58, 60 0x47, 0x41, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x55, 61 }, 62 { 63 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 64 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 65 0x05, 0x16, 0x01, 0x03, 0x6d, 0x2c, 0x23, 0x78, 66 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25, 67 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0x81, 0x80, 68 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 69 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x30, 0x2a, 70 0x00, 0x98, 0x51, 0x00, 0x2a, 0x40, 0x30, 0x70, 71 0x13, 0x00, 0xbc, 0x63, 0x11, 0x00, 0x00, 0x1e, 72 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e, 73 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20, 74 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b, 75 0x3d, 0x3e, 0x40, 0x0b, 0x00, 0x0a, 0x20, 0x20, 76 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, 77 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x53, 78 0x58, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0xa0, 79 }, 80 { 81 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 82 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 83 0x05, 0x16, 0x01, 0x03, 0x6d, 0x37, 0x29, 0x78, 84 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25, 85 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xa9, 0x40, 86 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 87 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x48, 0x3f, 88 0x40, 0x30, 0x62, 0xb0, 0x32, 0x40, 0x40, 0xc0, 89 0x13, 0x00, 0x2b, 0xa0, 0x21, 0x00, 0x00, 0x1e, 90 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e, 91 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20, 92 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b, 93 0x3d, 0x4a, 0x4c, 0x11, 0x00, 0x0a, 0x20, 0x20, 94 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, 95 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x55, 96 0x58, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0x9d, 97 }, 98 { 99 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 100 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 101 0x05, 0x16, 0x01, 0x03, 0x6d, 0x2b, 0x1b, 0x78, 102 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25, 103 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xb3, 0x00, 104 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 105 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x21, 0x39, 106 0x90, 0x30, 0x62, 0x1a, 0x27, 0x40, 0x68, 0xb0, 107 0x36, 0x00, 0xb5, 0x11, 0x11, 0x00, 0x00, 0x1e, 108 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e, 109 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20, 110 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b, 111 0x3d, 0x40, 0x42, 0x0f, 0x00, 0x0a, 0x20, 0x20, 112 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, 113 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x57, 114 0x53, 0x58, 0x47, 0x41, 0x0a, 0x20, 0x00, 0x26, 115 }, 116 { 117 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 118 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 119 0x05, 0x16, 0x01, 0x03, 0x6d, 0x32, 0x1c, 0x78, 120 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25, 121 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xd1, 0xc0, 122 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 123 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x3a, 124 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c, 125 0x45, 0x00, 0xf4, 0x19, 0x11, 0x00, 0x00, 0x1e, 126 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e, 127 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20, 128 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b, 129 0x3d, 0x42, 0x44, 0x0f, 0x00, 0x0a, 0x20, 0x20, 130 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, 131 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x46, 132 0x48, 0x44, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x05, 133 }, 134 }; 135 136 static u8 *edid_load(struct drm_connector *connector, const char *name, 137 const char *connector_name) 138 { 139 const struct firmware *fw; 140 struct platform_device *pdev; 141 u8 *fwdata = NULL, *edid, *new_edid; 142 int fwsize, expected; 143 int builtin = 0, err = 0; 144 int i, valid_extensions = 0; 145 bool print_bad_edid = !connector->bad_edid_counter || (drm_debug & DRM_UT_KMS); 146 147 pdev = platform_device_register_simple(connector_name, -1, NULL, 0); 148 if (IS_ERR(pdev)) { 149 DRM_ERROR("Failed to register EDID firmware platform device " 150 "for connector \"%s\"\n", connector_name); 151 err = -EINVAL; 152 goto out; 153 } 154 155 err = request_firmware(&fw, name, &pdev->dev); 156 platform_device_unregister(pdev); 157 158 if (err) { 159 i = 0; 160 while (i < GENERIC_EDIDS && strcmp(name, generic_edid_name[i])) 161 i++; 162 if (i < GENERIC_EDIDS) { 163 err = 0; 164 builtin = 1; 165 fwdata = generic_edid[i]; 166 fwsize = sizeof(generic_edid[i]); 167 } 168 } 169 170 if (err) { 171 DRM_ERROR("Requesting EDID firmware \"%s\" failed (err=%d)\n", 172 name, err); 173 goto out; 174 } 175 176 if (fwdata == NULL) { 177 fwdata = (u8 *) fw->data; 178 fwsize = fw->size; 179 } 180 181 expected = (fwdata[0x7e] + 1) * EDID_LENGTH; 182 if (expected != fwsize) { 183 DRM_ERROR("Size of EDID firmware \"%s\" is invalid " 184 "(expected %d, got %d)\n", name, expected, (int) fwsize); 185 err = -EINVAL; 186 goto relfw_out; 187 } 188 189 edid = kmemdup(fwdata, fwsize, GFP_KERNEL); 190 if (edid == NULL) { 191 err = -ENOMEM; 192 goto relfw_out; 193 } 194 195 if (!drm_edid_block_valid(edid, 0, print_bad_edid)) { 196 connector->bad_edid_counter++; 197 DRM_ERROR("Base block of EDID firmware \"%s\" is invalid ", 198 name); 199 kfree(edid); 200 err = -EINVAL; 201 goto relfw_out; 202 } 203 204 for (i = 1; i <= edid[0x7e]; i++) { 205 if (i != valid_extensions + 1) 206 memcpy(edid + (valid_extensions + 1) * EDID_LENGTH, 207 edid + i * EDID_LENGTH, EDID_LENGTH); 208 if (drm_edid_block_valid(edid + i * EDID_LENGTH, i, print_bad_edid)) 209 valid_extensions++; 210 } 211 212 if (valid_extensions != edid[0x7e]) { 213 edid[EDID_LENGTH-1] += edid[0x7e] - valid_extensions; 214 DRM_INFO("Found %d valid extensions instead of %d in EDID data " 215 "\"%s\" for connector \"%s\"\n", valid_extensions, 216 edid[0x7e], name, connector_name); 217 edid[0x7e] = valid_extensions; 218 new_edid = krealloc(edid, (valid_extensions + 1) * EDID_LENGTH, 219 GFP_KERNEL); 220 if (new_edid == NULL) { 221 err = -ENOMEM; 222 kfree(edid); 223 goto relfw_out; 224 } 225 edid = new_edid; 226 } 227 228 DRM_INFO("Got %s EDID base block and %d extension%s from " 229 "\"%s\" for connector \"%s\"\n", builtin ? "built-in" : 230 "external", valid_extensions, valid_extensions == 1 ? "" : "s", 231 name, connector_name); 232 233 relfw_out: 234 release_firmware(fw); 235 236 out: 237 if (err) 238 return ERR_PTR(err); 239 240 return edid; 241 } 242 243 int drm_load_edid_firmware(struct drm_connector *connector) 244 { 245 const char *connector_name = drm_get_connector_name(connector); 246 char *edidname = edid_firmware, *last, *colon; 247 int ret; 248 struct edid *edid; 249 250 if (*edidname == '\0') 251 return 0; 252 253 colon = strchr(edidname, ':'); 254 if (colon != NULL) { 255 if (strncmp(connector_name, edidname, colon - edidname)) 256 return 0; 257 edidname = colon + 1; 258 if (*edidname == '\0') 259 return 0; 260 } 261 262 last = edidname + strlen(edidname) - 1; 263 if (*last == '\n') 264 *last = '\0'; 265 266 edid = (struct edid *) edid_load(connector, edidname, connector_name); 267 if (IS_ERR_OR_NULL(edid)) 268 return 0; 269 270 drm_mode_connector_update_edid_property(connector, edid); 271 ret = drm_add_edid_modes(connector, edid); 272 kfree(edid); 273 274 return ret; 275 } 276