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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>
This commit is contained in:
Jernej Skrabec 2021-04-22 01:14:29 +01:00 committed by Anatolij Gustschin
parent 3daea8632c
commit a327feeef4
1 changed files with 18 additions and 0 deletions
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18
common/edid.c
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@ -220,6 +220,24 @@ int edid_get_timing_validate(u8 *buf, int buf_size,
/* 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;