diff mbox series

[v2,7/8] edid: allow arbitrary-length checksums

Message ID 20210427150824.638359-8-kraxel@redhat.com (mailing list archive)
State New, archived
Headers show
Series edid: windows fixes | expand

Commit Message

Gerd Hoffmann April 27, 2021, 3:08 p.m. UTC 
From: Konstantin Nazarov <mail@knazarov.com>

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>
---
 hw/display/edid-generate.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/hw/display/edid-generate.c b/hw/display/edid-generate.c
index b70ab1557e50..bdd01571fc9b 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);
     }
 }