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edid: use dta extension block descriptors

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When the 4 descriptors in the base edid block are filled, jump to the
dta extension block.  This allows for more than four descriptors.
Happens for example when generating an edid blob with a serial number
(qemu-edid -s $serial).

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-id: 20210427150824.638359-1-kraxel@redhat.com
Message-Id: <20210427150824.638359-5-kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2021-04-27 17:08:20 +02:00
parent ec70aec8dc
commit 4f9e268637
1 changed files with 8 additions and 0 deletions
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8
hw/display/edid-generate.c
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@ -152,6 +152,14 @@ static uint8_t *edid_desc_next(uint8_t *edid, uint8_t *dta, uint8_t *desc)
if (desc + 18 + 18 < edid + 127) {
return desc + 18;
}
if (dta) {
if (desc < edid + 127) {
return dta + dta[2];
}
if (desc + 18 + 18 < dta + 127) {
return desc + 18;
}
}
return NULL;
}