So much broken hardware, so few bullets.
Signed-off-by: Adam Jackson <[email protected]>
---
Documentation/kernel-parameters.txt | 3 +++
drivers/gpu/drm/drm_edid.c | 12 ++++++++++--
2 files changed, 13 insertions(+), 2 deletions(-)
diff --git a/Documentation/kernel-parameters.txt
b/Documentation/kernel-parameters.txt
index 17d50d2..5814331 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -713,6 +713,9 @@ and is between 256 and 4096 characters. It is defined in
the file
edd= [EDD]
Format: {"off" | "on" | "skip[mbr]"}
+ edid_force_checksum=<bool> [DRM]
+ Forcibly correct EDID checksum errors. Default is off.
+
edid_threshold=<int> [DRM]
Set the minimum number of bytes of an EDID header
that must be valid, out of 8. The default is 6.
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 6a1b5a3..55b498e 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -66,6 +66,10 @@ static unsigned int edid_threshold = 6;
MODULE_PARM_DESC(edid_threshold, "EDID header fixup threshold (default: 6)");
module_param_named(edid_threshold, edid_threshold, int, 0600);
+static bool edid_force_checksum = 0;
+MODULE_PARM_DESC(edid_force_checksum, "Forcibly correct EDID checksum");
+module_param_named(edid_force_checksum, edid_force_checksum, int, 0600);
+
#define LEVEL_DMT 0
#define LEVEL_GTF 1
#define LEVEL_GTF2 2
@@ -149,8 +153,12 @@ drm_edid_block_valid(u8 *raw_edid)
for (i = 0; i < EDID_LENGTH; i++)
csum += raw_edid[i];
if (csum) {
- DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum);
- goto bad;
+ if (edid_force_checksum) {
+ raw_edid[0x7f] -= csum;
+ } else {
+ DRM_ERROR("EDID checksum is invalid (%d)\n", csum);
+ goto bad;
+ }
}
/* per-block-type checks */
--
1.7.0.1
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