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 struct platform_device *pdev; 176 int err; 177 178 pdev = platform_device_register_simple(connector->name, -1, NULL, 0); 179 if (IS_ERR(pdev)) { 180 drm_err(connector->dev, 181 "[CONNECTOR:%d:%s] Failed to register EDID firmware platform device for connector \"%s\"\n", 182 connector->base.id, connector->name, 183 connector->name); 184 return ERR_CAST(pdev); 185 } 186 187 err = request_firmware(&fw, name, &pdev->dev); 188 platform_device_unregister(pdev); 189 if (err) { 190 drm_err(connector->dev, 191 "[CONNECTOR:%d:%s] Requesting EDID firmware \"%s\" failed (err=%d)\n", 192 connector->base.id, connector->name, 193 name, err); 194 return ERR_PTR(err); 195 } 196 197 fwdata = fw->data; 198 fwsize = fw->size; 199 } 200 201 drm_dbg_kms(connector->dev, "[CONNECTOR:%d:%s] Loaded %s firmware EDID \"%s\"\n", 202 connector->base.id, connector->name, 203 builtin >= 0 ? "built-in" : "external", name); 204 205 drm_edid = drm_edid_alloc(fwdata, fwsize); 206 if (!drm_edid_valid(drm_edid)) { 207 drm_err(connector->dev, "Invalid firmware EDID \"%s\"\n", name); 208 drm_edid_free(drm_edid); 209 drm_edid = ERR_PTR(-EINVAL); 210 } 211 212 release_firmware(fw); 213 214 return drm_edid; 215 } 216 217 const struct drm_edid *drm_edid_load_firmware(struct drm_connector *connector) 218 { 219 char *edidname, *last, *colon, *fwstr, *edidstr, *fallback = NULL; 220 const struct drm_edid *drm_edid; 221 222 if (edid_firmware[0] == '\0') 223 return ERR_PTR(-ENOENT); 224 225 /* 226 * If there are multiple edid files specified and separated 227 * by commas, search through the list looking for one that 228 * matches the connector. 229 * 230 * If there's one or more that doesn't specify a connector, keep 231 * the last one found one as a fallback. 232 */ 233 fwstr = kstrdup(edid_firmware, GFP_KERNEL); 234 if (!fwstr) 235 return ERR_PTR(-ENOMEM); 236 edidstr = fwstr; 237 238 while ((edidname = strsep(&edidstr, ","))) { 239 colon = strchr(edidname, ':'); 240 if (colon != NULL) { 241 if (strncmp(connector->name, edidname, colon - edidname)) 242 continue; 243 edidname = colon + 1; 244 break; 245 } 246 247 if (*edidname != '\0') /* corner case: multiple ',' */ 248 fallback = edidname; 249 } 250 251 if (!edidname) { 252 if (!fallback) { 253 kfree(fwstr); 254 return ERR_PTR(-ENOENT); 255 } 256 edidname = fallback; 257 } 258 259 last = edidname + strlen(edidname) - 1; 260 if (*last == '\n') 261 *last = '\0'; 262 263 drm_edid = edid_load(connector, edidname); 264 265 kfree(fwstr); 266 267 return drm_edid; 268 } 269