common: edid: Search for valid timing in extension block
One of my monitors have only 4k@60 timing in base EDID block which is
out of range for devices with HDMI 1.4. It turns out that it has
additional detailed timings in CTA-861 Extension Block and two of them
are appropriate for HDMI 1.4.
Add additional search for valid detailed timing in extension block.
Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Acked-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/common/edid.c b/common/edid.c
index a6c875d..fa85bcd 100644
--- a/common/edid.c
+++ b/common/edid.c
@@ -220,6 +220,24 @@
/* Look for detailed timing in base EDID */
found = edid_find_valid_timing(edid->monitor_details.descriptor, 4,
timing, mode_valid, mode_valid_priv);
+
+ /* Look for detailed timing in CTA-861 Extension Block */
+ if (!found && edid->extension_flag && buf_size >= EDID_EXT_SIZE) {
+ struct edid_cea861_info *info =
+ (struct edid_cea861_info *)(buf + sizeof(*edid));
+
+ if (info->extension_tag == EDID_CEA861_EXTENSION_TAG) {
+ int count = EDID_CEA861_DTD_COUNT(*info);
+ int offset = info->dtd_offset;
+ int size = count * sizeof(struct edid_detailed_timing);
+
+ if (offset >= 4 && offset + size < EDID_SIZE)
+ found = edid_find_valid_timing(
+ (u8 *)info + offset, count, timing,
+ mode_valid, mode_valid_priv);
+ }
+ }
+
if (!found)
return -EINVAL;