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 "drmP.h" 25 #include "drm_crtc.h" 26 #include "drm_crtc_helper.h" 27 #include "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 4 35 static char *generic_edid_name[GENERIC_EDIDS] = { 36 "edid/1024x768.bin", 37 "edid/1280x1024.bin", 38 "edid/1680x1050.bin", 39 "edid/1920x1080.bin", 40 }; 41 42 static u8 generic_edid[GENERIC_EDIDS][128] = { 43 { 44 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 45 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 46 0x05, 0x16, 0x01, 0x03, 0x6d, 0x23, 0x1a, 0x78, 47 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25, 48 0x20, 0x50, 0x54, 0x00, 0x08, 0x00, 0x61, 0x40, 49 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 50 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x64, 0x19, 51 0x00, 0x40, 0x41, 0x00, 0x26, 0x30, 0x08, 0x90, 52 0x36, 0x00, 0x63, 0x0a, 0x11, 0x00, 0x00, 0x18, 53 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e, 54 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20, 55 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b, 56 0x3d, 0x2f, 0x31, 0x07, 0x00, 0x0a, 0x20, 0x20, 57 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, 58 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x58, 59 0x47, 0x41, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x55, 60 }, 61 { 62 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 63 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 64 0x05, 0x16, 0x01, 0x03, 0x6d, 0x2c, 0x23, 0x78, 65 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25, 66 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0x81, 0x80, 67 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 68 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x30, 0x2a, 69 0x00, 0x98, 0x51, 0x00, 0x2a, 0x40, 0x30, 0x70, 70 0x13, 0x00, 0xbc, 0x63, 0x11, 0x00, 0x00, 0x1e, 71 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e, 72 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20, 73 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b, 74 0x3d, 0x3e, 0x40, 0x0b, 0x00, 0x0a, 0x20, 0x20, 75 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, 76 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x53, 77 0x58, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0xa0, 78 }, 79 { 80 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 81 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 82 0x05, 0x16, 0x01, 0x03, 0x6d, 0x2b, 0x1b, 0x78, 83 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25, 84 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xb3, 0x00, 85 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 86 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x21, 0x39, 87 0x90, 0x30, 0x62, 0x1a, 0x27, 0x40, 0x68, 0xb0, 88 0x36, 0x00, 0xb5, 0x11, 0x11, 0x00, 0x00, 0x1e, 89 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e, 90 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20, 91 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b, 92 0x3d, 0x40, 0x42, 0x0f, 0x00, 0x0a, 0x20, 0x20, 93 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, 94 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x57, 95 0x53, 0x58, 0x47, 0x41, 0x0a, 0x20, 0x00, 0x26, 96 }, 97 { 98 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 99 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 100 0x05, 0x16, 0x01, 0x03, 0x6d, 0x32, 0x1c, 0x78, 101 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25, 102 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xd1, 0xc0, 103 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 104 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x3a, 105 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c, 106 0x45, 0x00, 0xf4, 0x19, 0x11, 0x00, 0x00, 0x1e, 107 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e, 108 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20, 109 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b, 110 0x3d, 0x42, 0x44, 0x0f, 0x00, 0x0a, 0x20, 0x20, 111 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, 112 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x46, 113 0x48, 0x44, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x05, 114 }, 115 }; 116 117 static int edid_load(struct drm_connector *connector, char *name, 118 char *connector_name) 119 { 120 const struct firmware *fw; 121 struct platform_device *pdev; 122 u8 *fwdata = NULL, *edid, *new_edid; 123 int fwsize, expected; 124 int builtin = 0, err = 0; 125 int i, valid_extensions = 0; 126 127 pdev = platform_device_register_simple(connector_name, -1, NULL, 0); 128 if (IS_ERR(pdev)) { 129 DRM_ERROR("Failed to register EDID firmware platform device " 130 "for connector \"%s\"\n", connector_name); 131 err = -EINVAL; 132 goto out; 133 } 134 135 err = request_firmware(&fw, name, &pdev->dev); 136 platform_device_unregister(pdev); 137 138 if (err) { 139 i = 0; 140 while (i < GENERIC_EDIDS && strcmp(name, generic_edid_name[i])) 141 i++; 142 if (i < GENERIC_EDIDS) { 143 err = 0; 144 builtin = 1; 145 fwdata = generic_edid[i]; 146 fwsize = sizeof(generic_edid[i]); 147 } 148 } 149 150 if (err) { 151 DRM_ERROR("Requesting EDID firmware \"%s\" failed (err=%d)\n", 152 name, err); 153 goto out; 154 } 155 156 if (fwdata == NULL) { 157 fwdata = (u8 *) fw->data; 158 fwsize = fw->size; 159 } 160 161 expected = (fwdata[0x7e] + 1) * EDID_LENGTH; 162 if (expected != fwsize) { 163 DRM_ERROR("Size of EDID firmware \"%s\" is invalid " 164 "(expected %d, got %d)\n", name, expected, (int) fwsize); 165 err = -EINVAL; 166 goto relfw_out; 167 } 168 169 edid = kmalloc(fwsize, GFP_KERNEL); 170 if (edid == NULL) { 171 err = -ENOMEM; 172 goto relfw_out; 173 } 174 memcpy(edid, fwdata, fwsize); 175 176 if (!drm_edid_block_valid(edid, 0)) { 177 DRM_ERROR("Base block of EDID firmware \"%s\" is invalid ", 178 name); 179 kfree(edid); 180 err = -EINVAL; 181 goto relfw_out; 182 } 183 184 for (i = 1; i <= edid[0x7e]; i++) { 185 if (i != valid_extensions + 1) 186 memcpy(edid + (valid_extensions + 1) * EDID_LENGTH, 187 edid + i * EDID_LENGTH, EDID_LENGTH); 188 if (drm_edid_block_valid(edid + i * EDID_LENGTH, i)) 189 valid_extensions++; 190 } 191 192 if (valid_extensions != edid[0x7e]) { 193 edid[EDID_LENGTH-1] += edid[0x7e] - valid_extensions; 194 DRM_INFO("Found %d valid extensions instead of %d in EDID data " 195 "\"%s\" for connector \"%s\"\n", valid_extensions, 196 edid[0x7e], name, connector_name); 197 edid[0x7e] = valid_extensions; 198 new_edid = krealloc(edid, (valid_extensions + 1) * EDID_LENGTH, 199 GFP_KERNEL); 200 if (new_edid == NULL) { 201 err = -ENOMEM; 202 kfree(edid); 203 goto relfw_out; 204 } 205 edid = new_edid; 206 } 207 208 connector->display_info.raw_edid = edid; 209 DRM_INFO("Got %s EDID base block and %d extension%s from " 210 "\"%s\" for connector \"%s\"\n", builtin ? "built-in" : 211 "external", valid_extensions, valid_extensions == 1 ? "" : "s", 212 name, connector_name); 213 214 relfw_out: 215 release_firmware(fw); 216 217 out: 218 return err; 219 } 220 221 int drm_load_edid_firmware(struct drm_connector *connector) 222 { 223 char *connector_name = drm_get_connector_name(connector); 224 char *edidname = edid_firmware, *last, *colon; 225 int ret; 226 227 if (*edidname == '\0') 228 return 0; 229 230 colon = strchr(edidname, ':'); 231 if (colon != NULL) { 232 if (strncmp(connector_name, edidname, colon - edidname)) 233 return 0; 234 edidname = colon + 1; 235 if (*edidname == '\0') 236 return 0; 237 } 238 239 last = edidname + strlen(edidname) - 1; 240 if (*last == '\n') 241 *last = '\0'; 242 243 ret = edid_load(connector, edidname, connector_name); 244 if (ret) 245 return 0; 246 247 drm_mode_connector_update_edid_property(connector, 248 (struct edid *) connector->display_info.raw_edid); 249 250 return drm_add_edid_modes(connector, (struct edid *) 251 connector->display_info.raw_edid); 252 } 253