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Subject: edid-decode: support HF-EEODB when reading EDID over DDC Author: Hans Verkuil <hverk...@xs4all.nl> Date: Thu Jan 16 09:49:41 2025 +0100 The code to read an EDID directly over the DDC bus did not support the HDMI Forum EDID Extension Override Data Block, so EDIDs that support that would ignore the extra extension data blocks. Check for the presence of this data block and obtain the correct number of extension blocks. Signed-off-by: Hans Verkuil <hverk...@xs4all.nl> utils/edid-decode/ddc.cpp | 10 ++++++++++ 1 file changed, 10 insertions(+) --- http://git.linuxtv.org/cgit.cgi/v4l-utils.git/commit/?id=bbb6a0f149469484339238afa0aafa5c0b3d7782 diff --git a/utils/edid-decode/ddc.cpp b/utils/edid-decode/ddc.cpp index d391a5287437..3bdcbb4e9363 100644 --- a/utils/edid-decode/ddc.cpp +++ b/utils/edid-decode/ddc.cpp @@ -109,6 +109,16 @@ int read_edid(int adapter_fd, unsigned char *edid, bool silent) n_extension_blocks = edid[126]; if (!n_extension_blocks) return 1; + + // Check for HDMI Forum EDID Extension Override Data Block + if (n_extension_blocks >= 1 && + edid[128] == 2 && + edid[133] == 0x78 && + (edid[132] & 0xe0) == 0xe0 && + (edid[132] & 0x1f) >= 2 && + edid[134] > 1) + n_extension_blocks = edid[134]; + for (unsigned i = 2; i <= n_extension_blocks; i += 2) { err = read_edid_block(adapter_fd, edid + i * 128, i / 2, 0, (i + 1 > n_extension_blocks ? 1 : 2),
