diff options
| -rw-r--r-- | lib/igt_eld.c | 29 | ||||
| -rw-r--r-- | lib/igt_eld.h | 1 |
2 files changed, 30 insertions, 0 deletions
diff --git a/lib/igt_eld.c b/lib/igt_eld.c index 23ebf630..ef6625df 100644 --- a/lib/igt_eld.c +++ b/lib/igt_eld.c @@ -283,3 +283,32 @@ bool eld_is_supported(void) return has_elds; } + +#define ELD_MAX_SIZE 256 +#define MONITOR_NAME_OFFSET 20 +#define MONITOR_NAME_MAX_SIZE 16 + +/** eld_is_igt: check whether the ELD blob comes from an IGT EDID */ +bool eld_is_igt(const char *eld, size_t eld_size) +{ + char name[MONITOR_NAME_MAX_SIZE + 1]; + int name_size; + + igt_assert_f(eld_size >= MONITOR_NAME_OFFSET && + eld_size <= ELD_MAX_SIZE, + "Invalid ELD size: %zu\n", eld_size); + + name_size = eld[4] & 0x1F; + igt_assert_f(name_size <= MONITOR_NAME_MAX_SIZE && + MONITOR_NAME_OFFSET + name_size <= eld_size, + "Invalid monitor name size in ELD: %d\n", name_size); + if (name_size == 0) { + igt_debug("ELD doesn't contain a monitor name\n"); + return false; + } + + memcpy(name, &eld[MONITOR_NAME_OFFSET], name_size); + name[name_size] = '\0'; + igt_debug("Checking ELD with monitor name: %s\n", name); + return strcmp(name, "IGT") == 0; +} diff --git a/lib/igt_eld.h b/lib/igt_eld.h index 4b917a62..30d7012d 100644 --- a/lib/igt_eld.h +++ b/lib/igt_eld.h @@ -52,5 +52,6 @@ struct eld_entry { bool eld_is_supported(void); bool eld_get_igt(struct eld_entry *eld); bool eld_has_igt(void); +bool eld_is_igt(const char *eld, size_t eld_size); #endif |