| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| drm_edid_load.c: use a built-in EDID data set or load it via the firmware |
| interface |
| |
| Copyright (C) 2012 Carsten Emde <C.Emde@osadl.org> |
| |
| */ |
| |
| #include <linux/firmware.h> |
| #include <linux/module.h> |
| #include <linux/platform_device.h> |
| |
| #include <drm/drm_connector.h> |
| #include <drm/drm_drv.h> |
| #include <drm/drm_edid.h> |
| #include <drm/drm_print.h> |
| |
| #include "drm_crtc_internal.h" |
| |
| static char edid_firmware[PATH_MAX]; |
| module_param_string(edid_firmware, edid_firmware, sizeof(edid_firmware), 0644); |
| MODULE_PARM_DESC(edid_firmware, "Do not probe monitor, use specified EDID blob " |
| "from built-in data or /lib/firmware instead. "); |
| |
| /* Use only for backward compatibility with drm_kms_helper.edid_firmware */ |
| int __drm_set_edid_firmware_path(const char *path) |
| { |
| scnprintf(edid_firmware, sizeof(edid_firmware), "%s", path); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(__drm_set_edid_firmware_path); |
| |
| /* Use only for backward compatibility with drm_kms_helper.edid_firmware */ |
| int __drm_get_edid_firmware_path(char *buf, size_t bufsize) |
| { |
| return scnprintf(buf, bufsize, "%s", edid_firmware); |
| } |
| EXPORT_SYMBOL(__drm_get_edid_firmware_path); |
| |
| #define GENERIC_EDIDS 6 |
| static const char * const generic_edid_name[GENERIC_EDIDS] = { |
| "edid/800x600.bin", |
| "edid/1024x768.bin", |
| "edid/1280x1024.bin", |
| "edid/1600x1200.bin", |
| "edid/1680x1050.bin", |
| "edid/1920x1080.bin", |
| }; |
| |
| static const u8 generic_edid[GENERIC_EDIDS][128] = { |
| { |
| 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, |
| 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x05, 0x16, 0x01, 0x03, 0x6d, 0x1b, 0x14, 0x78, |
| 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25, |
| 0x20, 0x50, 0x54, 0x01, 0x00, 0x00, 0x45, 0x40, |
| 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, |
| 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0xa0, 0x0f, |
| 0x20, 0x00, 0x31, 0x58, 0x1c, 0x20, 0x28, 0x80, |
| 0x14, 0x00, 0x15, 0xd0, 0x10, 0x00, 0x00, 0x1e, |
| 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e, |
| 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20, |
| 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b, |
| 0x3d, 0x24, 0x26, 0x05, 0x00, 0x0a, 0x20, 0x20, |
| 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, |
| 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x53, |
| 0x56, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0xc2, |
| }, |
| { |
| 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, |
| 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x05, 0x16, 0x01, 0x03, 0x6d, 0x23, 0x1a, 0x78, |
| 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25, |
| 0x20, 0x50, 0x54, 0x00, 0x08, 0x00, 0x61, 0x40, |
| 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, |
| 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x64, 0x19, |
| 0x00, 0x40, 0x41, 0x00, 0x26, 0x30, 0x08, 0x90, |
| 0x36, 0x00, 0x63, 0x0a, 0x11, 0x00, 0x00, 0x18, |
| 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e, |
| 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20, |
| 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b, |
| 0x3d, 0x2f, 0x31, 0x07, 0x00, 0x0a, 0x20, 0x20, |
| 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, |
| 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x58, |
| 0x47, 0x41, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x55, |
| }, |
| { |
| 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, |
| 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x05, 0x16, 0x01, 0x03, 0x6d, 0x2c, 0x23, 0x78, |
| 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25, |
| 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0x81, 0x80, |
| 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, |
| 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x30, 0x2a, |
| 0x00, 0x98, 0x51, 0x00, 0x2a, 0x40, 0x30, 0x70, |
| 0x13, 0x00, 0xbc, 0x63, 0x11, 0x00, 0x00, 0x1e, |
| 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e, |
| 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20, |
| 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b, |
| 0x3d, 0x3e, 0x40, 0x0b, 0x00, 0x0a, 0x20, 0x20, |
| 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, |
| 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x53, |
| 0x58, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0xa0, |
| }, |
| { |
| 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, |
| 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x05, 0x16, 0x01, 0x03, 0x6d, 0x37, 0x29, 0x78, |
| 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25, |
| 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xa9, 0x40, |
| 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, |
| 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x48, 0x3f, |
| 0x40, 0x30, 0x62, 0xb0, 0x32, 0x40, 0x40, 0xc0, |
| 0x13, 0x00, 0x2b, 0xa0, 0x21, 0x00, 0x00, 0x1e, |
| 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e, |
| 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20, |
| 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b, |
| 0x3d, 0x4a, 0x4c, 0x11, 0x00, 0x0a, 0x20, 0x20, |
| 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, |
| 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x55, |
| 0x58, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0x9d, |
| }, |
| { |
| 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, |
| 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x05, 0x16, 0x01, 0x03, 0x6d, 0x2b, 0x1b, 0x78, |
| 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25, |
| 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xb3, 0x00, |
| 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, |
| 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x21, 0x39, |
| 0x90, 0x30, 0x62, 0x1a, 0x27, 0x40, 0x68, 0xb0, |
| 0x36, 0x00, 0xb5, 0x11, 0x11, 0x00, 0x00, 0x1e, |
| 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e, |
| 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20, |
| 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b, |
| 0x3d, 0x40, 0x42, 0x0f, 0x00, 0x0a, 0x20, 0x20, |
| 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, |
| 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x57, |
| 0x53, 0x58, 0x47, 0x41, 0x0a, 0x20, 0x00, 0x26, |
| }, |
| { |
| 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, |
| 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x05, 0x16, 0x01, 0x03, 0x6d, 0x32, 0x1c, 0x78, |
| 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25, |
| 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xd1, 0xc0, |
| 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, |
| 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x3a, |
| 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c, |
| 0x45, 0x00, 0xf4, 0x19, 0x11, 0x00, 0x00, 0x1e, |
| 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e, |
| 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20, |
| 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b, |
| 0x3d, 0x42, 0x44, 0x0f, 0x00, 0x0a, 0x20, 0x20, |
| 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc, |
| 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x46, |
| 0x48, 0x44, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x05, |
| }, |
| }; |
| |
| static const struct drm_edid *edid_load(struct drm_connector *connector, const char *name) |
| { |
| const struct firmware *fw = NULL; |
| const u8 *fwdata; |
| const struct drm_edid *drm_edid; |
| int fwsize, builtin; |
| |
| builtin = match_string(generic_edid_name, GENERIC_EDIDS, name); |
| if (builtin >= 0) { |
| fwdata = generic_edid[builtin]; |
| fwsize = sizeof(generic_edid[builtin]); |
| } else { |
| int err; |
| |
| err = request_firmware(&fw, name, connector->dev->dev); |
| if (err) { |
| drm_err(connector->dev, |
| "[CONNECTOR:%d:%s] Requesting EDID firmware \"%s\" failed (err=%d)\n", |
| connector->base.id, connector->name, |
| name, err); |
| return ERR_PTR(err); |
| } |
| |
| fwdata = fw->data; |
| fwsize = fw->size; |
| } |
| |
| drm_dbg_kms(connector->dev, "[CONNECTOR:%d:%s] Loaded %s firmware EDID \"%s\"\n", |
| connector->base.id, connector->name, |
| builtin >= 0 ? "built-in" : "external", name); |
| |
| drm_edid = drm_edid_alloc(fwdata, fwsize); |
| if (!drm_edid_valid(drm_edid)) { |
| drm_err(connector->dev, "Invalid firmware EDID \"%s\"\n", name); |
| drm_edid_free(drm_edid); |
| drm_edid = ERR_PTR(-EINVAL); |
| } |
| |
| release_firmware(fw); |
| |
| return drm_edid; |
| } |
| |
| const struct drm_edid *drm_edid_load_firmware(struct drm_connector *connector) |
| { |
| char *edidname, *last, *colon, *fwstr, *edidstr, *fallback = NULL; |
| const struct drm_edid *drm_edid; |
| |
| if (edid_firmware[0] == '\0') |
| return ERR_PTR(-ENOENT); |
| |
| /* |
| * If there are multiple edid files specified and separated |
| * by commas, search through the list looking for one that |
| * matches the connector. |
| * |
| * If there's one or more that doesn't specify a connector, keep |
| * the last one found one as a fallback. |
| */ |
| fwstr = kstrdup(edid_firmware, GFP_KERNEL); |
| if (!fwstr) |
| return ERR_PTR(-ENOMEM); |
| edidstr = fwstr; |
| |
| while ((edidname = strsep(&edidstr, ","))) { |
| colon = strchr(edidname, ':'); |
| if (colon != NULL) { |
| if (strncmp(connector->name, edidname, colon - edidname)) |
| continue; |
| edidname = colon + 1; |
| break; |
| } |
| |
| if (*edidname != '\0') /* corner case: multiple ',' */ |
| fallback = edidname; |
| } |
| |
| if (!edidname) { |
| if (!fallback) { |
| kfree(fwstr); |
| return ERR_PTR(-ENOENT); |
| } |
| edidname = fallback; |
| } |
| |
| last = edidname + strlen(edidname) - 1; |
| if (*last == '\n') |
| *last = '\0'; |
| |
| drm_edid = edid_load(connector, edidname); |
| |
| kfree(fwstr); |
| |
| return drm_edid; |
| } |
