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_connector.h> 15 #include <drm/drm_drv.h> 16 #include <drm/drm_edid.h> 17 #include <drm/drm_print.h> 18 19 #include "drm_crtc_internal.h" 20 21 static char edid_firmware[PATH_MAX]; 22 module_param_string(edid_firmware, edid_firmware, sizeof(edid_firmware), 0644); 23 MODULE_PARM_DESC(edid_firmware, "Do not probe monitor, use specified EDID blob " 24 "from built-in data or /lib/firmware instead. "); 25 26 /* Use only for backward compatibility with drm_kms_helper.edid_firmware */ 27 int __drm_set_edid_firmware_path(const char *path) 28 { 29 scnprintf(edid_firmware, sizeof(edid_firmware), "%s", path); 30 31 return 0; 32 } 33 EXPORT_SYMBOL(__drm_set_edid_firmware_path); 34 35 /* Use only for backward compatibility with drm_kms_helper.edid_firmware */ 36 int __drm_get_edid_firmware_path(char *buf, size_t bufsize) 37 { 38 return scnprintf(buf, bufsize, "%s", edid_firmware); 39 } 40 EXPORT_SYMBOL(__drm_get_edid_firmware_path); 41 42 #define GENERIC_EDIDS 6 43 static const char * const generic_edid_name[GENERIC_EDIDS] = { 44 "edid/800x600.bin", 45 "edid/1024x768.bin", 46 "edid/1280x1024.bin", 47 "edid/1600x1200.bin", 48 "edid/1680x1050.bin", 49 "edid/1920x1080.bin", 50 }; 51 52 static const u8 generic_edid[GENERIC_EDIDS][128] = { 53 { 54 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 55 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 56 0x05, 0x16, 0x01, 0x03, 0x6d, 0x1b, 0x14, 0x78, 57 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25, 58 0x20, 0x50, 0x54, 0x01, 0x00, 0x00, 0x45, 0x40, 59 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 60 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0xa0, 0x0f, 61 0x20, 0x00, 0x31, 0x58, 0x1c, 0x20, 0x28, 0x80, 62 0x14, 0x00, 0x15, 0xd0, 0x10, 0x00, 0x00, 0x1e, 63 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e, 64 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20, 65 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b, 66 0x3d, 0x24, 0x26, 0x05, 0x00, 0x0a, 0x20, 0x20, 67 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, 68 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x53, 69 0x56, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0xc2, 70 }, 71 { 72 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 73 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 74 0x05, 0x16, 0x01, 0x03, 0x6d, 0x23, 0x1a, 0x78, 75 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25, 76 0x20, 0x50, 0x54, 0x00, 0x08, 0x00, 0x61, 0x40, 77 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 78 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x64, 0x19, 79 0x00, 0x40, 0x41, 0x00, 0x26, 0x30, 0x08, 0x90, 80 0x36, 0x00, 0x63, 0x0a, 0x11, 0x00, 0x00, 0x18, 81 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e, 82 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20, 83 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b, 84 0x3d, 0x2f, 0x31, 0x07, 0x00, 0x0a, 0x20, 0x20, 85 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, 86 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x58, 87 0x47, 0x41, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x55, 88 }, 89 { 90 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 91 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 92 0x05, 0x16, 0x01, 0x03, 0x6d, 0x2c, 0x23, 0x78, 93 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25, 94 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0x81, 0x80, 95 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 96 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x30, 0x2a, 97 0x00, 0x98, 0x51, 0x00, 0x2a, 0x40, 0x30, 0x70, 98 0x13, 0x00, 0xbc, 0x63, 0x11, 0x00, 0x00, 0x1e, 99 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e, 100 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20, 101 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b, 102 0x3d, 0x3e, 0x40, 0x0b, 0x00, 0x0a, 0x20, 0x20, 103 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, 104 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x53, 105 0x58, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0xa0, 106 }, 107 { 108 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 109 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 110 0x05, 0x16, 0x01, 0x03, 0x6d, 0x37, 0x29, 0x78, 111 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25, 112 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xa9, 0x40, 113 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 114 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x48, 0x3f, 115 0x40, 0x30, 0x62, 0xb0, 0x32, 0x40, 0x40, 0xc0, 116 0x13, 0x00, 0x2b, 0xa0, 0x21, 0x00, 0x00, 0x1e, 117 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e, 118 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20, 119 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b, 120 0x3d, 0x4a, 0x4c, 0x11, 0x00, 0x0a, 0x20, 0x20, 121 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, 122 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x55, 123 0x58, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0x9d, 124 }, 125 { 126 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 127 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 128 0x05, 0x16, 0x01, 0x03, 0x6d, 0x2b, 0x1b, 0x78, 129 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25, 130 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xb3, 0x00, 131 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 132 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x21, 0x39, 133 0x90, 0x30, 0x62, 0x1a, 0x27, 0x40, 0x68, 0xb0, 134 0x36, 0x00, 0xb5, 0x11, 0x11, 0x00, 0x00, 0x1e, 135 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e, 136 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20, 137 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b, 138 0x3d, 0x40, 0x42, 0x0f, 0x00, 0x0a, 0x20, 0x20, 139 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, 140 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x57, 141 0x53, 0x58, 0x47, 0x41, 0x0a, 0x20, 0x00, 0x26, 142 }, 143 { 144 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 145 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 146 0x05, 0x16, 0x01, 0x03, 0x6d, 0x32, 0x1c, 0x78, 147 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25, 148 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xd1, 0xc0, 149 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 150 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x3a, 151 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c, 152 0x45, 0x00, 0xf4, 0x19, 0x11, 0x00, 0x00, 0x1e, 153 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e, 154 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20, 155 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b, 156 0x3d, 0x42, 0x44, 0x0f, 0x00, 0x0a, 0x20, 0x20, 157 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, 158 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x46, 159 0x48, 0x44, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x05, 160 }, 161 }; 162 163 static const struct drm_edid *edid_load(struct drm_connector *connector, const char *name) 164 { 165 const struct firmware *fw = NULL; 166 const u8 *fwdata; 167 const struct drm_edid *drm_edid; 168 int fwsize, builtin; 169 170 builtin = match_string(generic_edid_name, GENERIC_EDIDS, name); 171 if (builtin >= 0) { 172 fwdata = generic_edid[builtin]; 173 fwsize = sizeof(generic_edid[builtin]); 174 } else { 175 int err; 176 177 err = request_firmware(&fw, name, connector->dev->dev); 178 if (err) { 179 drm_err(connector->dev, 180 "[CONNECTOR:%d:%s] Requesting EDID firmware \"%s\" failed (err=%d)\n", 181 connector->base.id, connector->name, 182 name, err); 183 return ERR_PTR(err); 184 } 185 186 fwdata = fw->data; 187 fwsize = fw->size; 188 } 189 190 drm_dbg_kms(connector->dev, "[CONNECTOR:%d:%s] Loaded %s firmware EDID \"%s\"\n", 191 connector->base.id, connector->name, 192 builtin >= 0 ? "built-in" : "external", name); 193 194 drm_edid = drm_edid_alloc(fwdata, fwsize); 195 if (!drm_edid_valid(drm_edid)) { 196 drm_err(connector->dev, "Invalid firmware EDID \"%s\"\n", name); 197 drm_edid_free(drm_edid); 198 drm_edid = ERR_PTR(-EINVAL); 199 } 200 201 release_firmware(fw); 202 203 return drm_edid; 204 } 205 206 const struct drm_edid *drm_edid_load_firmware(struct drm_connector *connector) 207 { 208 char *edidname, *last, *colon, *fwstr, *edidstr, *fallback = NULL; 209 const struct drm_edid *drm_edid; 210 211 if (edid_firmware[0] == '\0') 212 return ERR_PTR(-ENOENT); 213 214 /* 215 * If there are multiple edid files specified and separated 216 * by commas, search through the list looking for one that 217 * matches the connector. 218 * 219 * If there's one or more that doesn't specify a connector, keep 220 * the last one found one as a fallback. 221 */ 222 fwstr = kstrdup(edid_firmware, GFP_KERNEL); 223 if (!fwstr) 224 return ERR_PTR(-ENOMEM); 225 edidstr = fwstr; 226 227 while ((edidname = strsep(&edidstr, ","))) { 228 colon = strchr(edidname, ':'); 229 if (colon != NULL) { 230 if (strncmp(connector->name, edidname, colon - edidname)) 231 continue; 232 edidname = colon + 1; 233 break; 234 } 235 236 if (*edidname != '\0') /* corner case: multiple ',' */ 237 fallback = edidname; 238 } 239 240 if (!edidname) { 241 if (!fallback) { 242 kfree(fwstr); 243 return ERR_PTR(-ENOENT); 244 } 245 edidname = fallback; 246 } 247 248 last = edidname + strlen(edidname) - 1; 249 if (*last == '\n') 250 *last = '\0'; 251 252 drm_edid = edid_load(connector, edidname); 253 254 kfree(fwstr); 255 256 return drm_edid; 257 } 258