drm/edid: Allow non-fatal checksum errors in CEA blocks
Switches will try to update the topology address and not correctly fix
up the checksum, so just let it slide.
https://bugs.freedesktop.org/28229
Signed-off-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index f569ae8..c198186 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -147,7 +147,10 @@
csum += raw_edid[i];
if (csum) {
DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum);
- goto bad;
+
+ /* allow CEA to slide through, switches mangle this */
+ if (raw_edid[0] != 0x02)
+ goto bad;
}
/* per-block-type checks */