drivers/gpu/drm/drm_edid_load.c

   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 }