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, char *name, 137 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 = kmalloc(fwsize, GFP_KERNEL); 190 if (edid == NULL) { 191 err = -ENOMEM; 192 goto relfw_out; 193 } 194 memcpy(edid, fwdata, fwsize); 195 196 if (!drm_edid_block_valid(edid, 0, print_bad_edid)) { 197 connector->bad_edid_counter++; 198 DRM_ERROR("Base block of EDID firmware \"%s\" is invalid ", 199 name); 200 kfree(edid); 201 err = -EINVAL; 202 goto relfw_out; 203 } 204 205 for (i = 1; i <= edid[0x7e]; i++) { 206 if (i != valid_extensions + 1) 207 memcpy(edid + (valid_extensions + 1) * EDID_LENGTH, 208 edid + i * EDID_LENGTH, EDID_LENGTH); 209 if (drm_edid_block_valid(edid + i * EDID_LENGTH, i, print_bad_edid)) 210 valid_extensions++; 211 } 212 213 if (valid_extensions != edid[0x7e]) { 214 edid[EDID_LENGTH-1] += edid[0x7e] - valid_extensions; 215 DRM_INFO("Found %d valid extensions instead of %d in EDID data " 216 "\"%s\" for connector \"%s\"\n", valid_extensions, 217 edid[0x7e], name, connector_name); 218 edid[0x7e] = valid_extensions; 219 new_edid = krealloc(edid, (valid_extensions + 1) * EDID_LENGTH, 220 GFP_KERNEL); 221 if (new_edid == NULL) { 222 err = -ENOMEM; 223 kfree(edid); 224 goto relfw_out; 225 } 226 edid = new_edid; 227 } 228 229 DRM_INFO("Got %s EDID base block and %d extension%s from " 230 "\"%s\" for connector \"%s\"\n", builtin ? "built-in" : 231 "external", valid_extensions, valid_extensions == 1 ? "" : "s", 232 name, connector_name); 233 234 relfw_out: 235 release_firmware(fw); 236 237 out: 238 if (err) 239 return ERR_PTR(err); 240 241 return edid; 242 } 243 244 int drm_load_edid_firmware(struct drm_connector *connector) 245 { 246 char *connector_name = drm_get_connector_name(connector); 247 char *edidname = edid_firmware, *last, *colon; 248 int ret; 249 struct edid *edid; 250 251 if (*edidname == '\0') 252 return 0; 253 254 colon = strchr(edidname, ':'); 255 if (colon != NULL) { 256 if (strncmp(connector_name, edidname, colon - edidname)) 257 return 0; 258 edidname = colon + 1; 259 if (*edidname == '\0') 260 return 0; 261 } 262 263 last = edidname + strlen(edidname) - 1; 264 if (*last == '\n') 265 *last = '\0'; 266 267 edid = (struct edid *) edid_load(connector, edidname, connector_name); 268 if (IS_ERR_OR_NULL(edid)) 269 return 0; 270 271 drm_mode_connector_update_edid_property(connector, edid); 272 ret = drm_add_edid_modes(connector, edid); 273 kfree(edid); 274 275 return ret; 276 } 277