/*
* Sanity check the EDID block (base or extension). Return 0 if the block
* doesn't check out, or 1 if it's valid.
*/
bool drm_edid_block_valid(u8 *raw_edid)
{
int i;
u8 csum = 0;
struct edid *edid = (struct edid *)raw_edid;
if (raw_edid[0] == 0x00) {
int score = drm_edid_header_is_valid(raw_edid);
if (score == 8) ;
else if (score >= 6) {
fprintf(stderr, "[000000.0] [drm:%s], ", __func__);
fprintf(stderr, "Fixing EDID header, your hardware may be failing\n");
memcpy(raw_edid, edid_header, sizeof(edid_header));
} else {
goto bad;
}
}
for (i = 0; i < EDID_LENGTH; i++)
csum += raw_edid[i];
if (csum) {
fprintf(stderr, "[000000.0] [drm:%s], ", __func__);
fprintf(stderr, "EDID checksum is invalid, remainder is %d\n", csum);
/* allow CEA to slide through, switches mangle this */
if (raw_edid[0] != 0x02)
goto bad;
}
/* per-block-type checks */
switch (raw_edid[0]) {
case 0: /* base */
if (edid->version != 1) {
fprintf(stderr, "[000000.0] [drm:%s], ", __func__);
fprintf(stderr, "EDID has major version %d, instead of 1\n", edid->version);
goto bad;
}
if (edid->revision > 4) {
fprintf(stderr, "[000000.0] [drm:%s], ", __func__);
fprintf(stderr, "EDID minor > 4, assuming backward compatibility\n");
}
break;
default:
break;
}
return 1;
bad:
if (raw_edid) {
fprintf(stderr, "[000000.0] [drm:%s], ", __func__);
fprintf(stderr, KERN_ERR "Raw EDID:\n");
print_hex_dump(KERN_ERR, " \t", DUMP_PREFIX_NONE, 16, 1,
raw_edid, EDID_LENGTH, false);
}
return 0;
}
/*
* Sanity check the EDID block (base or extension). Return 0 if the block
* doesn't check out, or 1 if it's valid.
*/
bool drm_edid_block_valid(u8 *raw_edid, int block, bool print_bad_edid)
{
int i;
u8 csum = 0;
struct edid *edid = (struct edid *)raw_edid;
if (edid_fixup > 8 || edid_fixup < 0)
edid_fixup = 6;
if (block == 0) {
int score = drm_edid_header_is_valid(raw_edid);
if (score == 8) ;
else if (score >= edid_fixup) {
DRM_DEBUG("Fixing EDID header, your hardware may be failing\n");
memcpy(raw_edid, edid_header, sizeof(edid_header));
} else {
goto bad;
}
}
for (i = 0; i < EDID_LENGTH; i++)
csum += raw_edid[i];
if (csum) {
if (print_bad_edid) {
DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum);
}
/* allow CEA to slide through, switches mangle this */
if (raw_edid[0] != 0x02)
goto bad;
}
/* per-block-type checks */
switch (raw_edid[0]) {
case 0: /* base */
if (edid->version != 1) {
DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version);
goto bad;
}
if (edid->revision > 4)
DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n");
break;
default:
break;
}
return 1;
bad:
if (raw_edid && print_bad_edid) {
DRM_DEBUG_KMS("Raw EDID:\n");
if ((drm_debug & DRM_DEBUGBITS_KMS) != 0) {
for (i = 0; i < EDID_LENGTH; ) {
kprintf("%02x", raw_edid[i]);
i++;
if (i % 16 == 0 || i == EDID_LENGTH)
kprintf("\n");
else if (i % 8 == 0)
kprintf(" ");
else
kprintf(" ");
}
}
}
return 0;
}
