diff options
Diffstat (limited to 'drivers/gpu/drm/drm_edid_load.c')
| -rw-r--r-- | drivers/gpu/drm/drm_edid_load.c | 317 |
1 files changed, 317 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_edid_load.c b/drivers/gpu/drm/drm_edid_load.c new file mode 100644 index 000000000..37d8ba3dd --- /dev/null +++ b/drivers/gpu/drm/drm_edid_load.c @@ -0,0 +1,317 @@ +// 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_crtc.h> +#include <drm/drm_crtc_helper.h> +#include <drm/drm_drv.h> +#include <drm/drm_edid.h> +#include <drm/drm_print.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 int edid_size(const u8 *edid, int data_size) +{ + if (data_size < EDID_LENGTH) + return 0; + + return (edid[0x7e] + 1) * EDID_LENGTH; +} + +static void *edid_load(struct drm_connector *connector, const char *name, + const char *connector_name) +{ + const struct firmware *fw = NULL; + const u8 *fwdata; + u8 *edid; + int fwsize, builtin; + int i, valid_extensions = 0; + bool print_bad_edid = !connector->bad_edid_counter || drm_debug_enabled(DRM_UT_KMS); + + builtin = match_string(generic_edid_name, GENERIC_EDIDS, name); + if (builtin >= 0) { + fwdata = generic_edid[builtin]; + fwsize = sizeof(generic_edid[builtin]); + } else { + struct platform_device *pdev; + int err; + + pdev = platform_device_register_simple(connector_name, -1, NULL, 0); + if (IS_ERR(pdev)) { + DRM_ERROR("Failed to register EDID firmware platform device " + "for connector \"%s\"\n", connector_name); + return ERR_CAST(pdev); + } + + err = request_firmware(&fw, name, &pdev->dev); + platform_device_unregister(pdev); + if (err) { + DRM_ERROR("Requesting EDID firmware \"%s\" failed (err=%d)\n", + name, err); + return ERR_PTR(err); + } + + fwdata = fw->data; + fwsize = fw->size; + } + + if (edid_size(fwdata, fwsize) != fwsize) { + DRM_ERROR("Size of EDID firmware \"%s\" is invalid " + "(expected %d, got %d\n", name, + edid_size(fwdata, fwsize), (int)fwsize); + edid = ERR_PTR(-EINVAL); + goto out; + } + + edid = kmemdup(fwdata, fwsize, GFP_KERNEL); + if (edid == NULL) { + edid = ERR_PTR(-ENOMEM); + goto out; + } + + if (!drm_edid_block_valid(edid, 0, print_bad_edid, + &connector->edid_corrupt)) { + connector->bad_edid_counter++; + DRM_ERROR("Base block of EDID firmware \"%s\" is invalid ", + name); + kfree(edid); + edid = ERR_PTR(-EINVAL); + goto out; + } + + for (i = 1; i <= edid[0x7e]; i++) { + if (i != valid_extensions + 1) + memcpy(edid + (valid_extensions + 1) * EDID_LENGTH, + edid + i * EDID_LENGTH, EDID_LENGTH); + if (drm_edid_block_valid(edid + i * EDID_LENGTH, i, + print_bad_edid, + NULL)) + valid_extensions++; + } + + if (valid_extensions != edid[0x7e]) { + u8 *new_edid; + + edid[EDID_LENGTH-1] += edid[0x7e] - valid_extensions; + DRM_INFO("Found %d valid extensions instead of %d in EDID data " + "\"%s\" for connector \"%s\"\n", valid_extensions, + edid[0x7e], name, connector_name); + edid[0x7e] = valid_extensions; + + new_edid = krealloc(edid, (valid_extensions + 1) * EDID_LENGTH, + GFP_KERNEL); + if (new_edid) + edid = new_edid; + } + + DRM_INFO("Got %s EDID base block and %d extension%s from " + "\"%s\" for connector \"%s\"\n", (builtin >= 0) ? "built-in" : + "external", valid_extensions, valid_extensions == 1 ? "" : "s", + name, connector_name); + +out: + release_firmware(fw); + return edid; +} + +struct edid *drm_load_edid_firmware(struct drm_connector *connector) +{ + const char *connector_name = connector->name; + char *edidname, *last, *colon, *fwstr, *edidstr, *fallback = NULL; + struct edid *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'; + + edid = edid_load(connector, edidname, connector_name); + kfree(fwstr); + + return edid; +} |