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| author | Konstantin Nazarov <mail@knazarov.com> | 2021-04-27 17:08:23 +0200 |
|---|---|---|
| committer | Gerd Hoffmann <kraxel@redhat.com> | 2021-05-10 11:41:02 +0200 |
| commit | 5a4e88cf3b64c4a5c92e43a90260c34a6a52d011 (patch) | |
| tree | bd91e8450f1d3e71994146707dcc3a2193b53546 /hw/display | |
| parent | 850dc61f5fd320a8d566b7da9365fd723511b7c3 (diff) | |
| download | qemu-5a4e88cf3b64c4a5c92e43a90260c34a6a52d011.zip qemu-5a4e88cf3b64c4a5c92e43a90260c34a6a52d011.tar.gz qemu-5a4e88cf3b64c4a5c92e43a90260c34a6a52d011.tar.bz2 | |
edid: allow arbitrary-length checksums
Some of the EDID extensions like DisplayID do checksums of their
subsections. Currently checksums can be only applied to the whole
extension blocks which are 128 bytes.
This patch allows to checksum arbitrary parts of EDID, and not only
whole extension blocks.
Based-on: <20210303152948.59943-2-akihiko.odaki@gmail.com>
Signed-off-by: Konstantin Nazarov <mail@knazarov.com>
Message-Id: <20210315114639.91953-2-mail@knazarov.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 20210427150824.638359-1-kraxel@redhat.com
Message-Id: <20210427150824.638359-8-kraxel@redhat.com>
Diffstat (limited to 'hw/display')
| -rw-r--r-- | hw/display/edid-generate.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/hw/display/edid-generate.c b/hw/display/edid-generate.c index b70ab15..bdd0157 100644 --- a/hw/display/edid-generate.c +++ b/hw/display/edid-generate.c @@ -159,17 +159,17 @@ static void edid_fill_modes(uint8_t *edid, uint8_t *xtra3, uint8_t *dta, } } -static void edid_checksum(uint8_t *edid) +static void edid_checksum(uint8_t *edid, size_t len) { uint32_t sum = 0; int i; - for (i = 0; i < 127; i++) { + for (i = 0; i < len; i++) { sum += edid[i]; } sum &= 0xff; if (sum) { - edid[127] = 0x100 - sum; + edid[len] = 0x100 - sum; } } @@ -474,9 +474,9 @@ void qemu_edid_generate(uint8_t *edid, size_t size, /* =============== finish up =============== */ - edid_checksum(edid); + edid_checksum(edid, 127); if (dta) { - edid_checksum(dta); + edid_checksum(dta, 127); } } |