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lib/edid.c: Differentiate between absent and non-conformant EDID

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Change-Id: Id90aa210ff72092c4ab638a7bafb82bd11889bdc
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/19502
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
This commit is contained in:
Arthur Heymans
2017-04-30 08:28:05 +02:00
committed by Nico Huber
parent a459a8a145
commit 8c5884e8d7
7 changed files with 28 additions and 21 deletions
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33
src/lib/edid.c
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@@ -66,7 +66,7 @@ struct edid_context {
int seen_non_detailed_descriptor;
int warning_excessive_dotclock_correction;
int warning_zero_preferred_refresh;
int conformant;
enum edid_status conformant;
};
/* Stuff that isn't used anywhere but is nice to pretty-print while
@@ -1134,7 +1134,7 @@ int decode_edid(unsigned char *edid, int size, struct edid *out)
.has_valid_range_descriptor = 1,
.has_valid_max_dotclock = 1,
.has_valid_string_termination = 1,
.conformant = 1,
.conformant = EDID_CONFORMANT,
};
dump_breakdown(edid);
@@ -1143,7 +1143,7 @@ int decode_edid(unsigned char *edid, int size, struct edid *out)
if (!edid || memcmp(edid, "\x00\xFF\xFF\xFF\xFF\xFF\xFF\x00", 8)) {
printk(BIOS_SPEW, "No header found\n");
return 1;
return EDID_ABSENT;
}
if (manufacturer_name(edid + 0x08))
@@ -1485,11 +1485,12 @@ int decode_edid(unsigned char *edid, int size, struct edid *out)
if (c.nonconformant_digital_display ||
!c.has_valid_string_termination ||
!c.has_valid_descriptor_pad ||
!c.has_preferred_timing)
c.conformant = 0;
if (!c.conformant)
!c.has_preferred_timing) {
c.conformant = EDID_NOT_CONFORMANT;
printk(BIOS_ERR,
"EDID block does NOT conform to EDID 1.4!\n");
}
if (c.nonconformant_digital_display)
printk(BIOS_ERR,
"\tDigital display field contains garbage: %x\n",
@@ -1507,7 +1508,7 @@ int decode_edid(unsigned char *edid, int size, struct edid *out)
!c.has_valid_string_termination ||
!c.has_valid_descriptor_pad ||
!c.has_preferred_timing) {
c.conformant = 0;
c.conformant = EDID_NOT_CONFORMANT;
}
/**
* According to E-EDID (EDIDv1.3), has_name_descriptor and
@@ -1516,7 +1517,7 @@ int decode_edid(unsigned char *edid, int size, struct edid *out)
* don't have them. As a workaround, we only print warning
* messages.
*/
if (!c.conformant)
if (c.conformant == EDID_NOT_CONFORMANT)
printk(BIOS_ERR,
"EDID block does NOT conform to EDID 1.3!\n");
else if (!c.has_name_descriptor || !c.has_range_descriptor)
@@ -1542,11 +1543,11 @@ int decode_edid(unsigned char *edid, int size, struct edid *out)
"\tDetailed block string not properly terminated\n");
} else if (c.claims_one_point_two) {
if (c.nonconformant_digital_display ||
!c.has_valid_string_termination)
c.conformant = 0;
if (!c.conformant)
!c.has_valid_string_termination) {
c.conformant = EDID_NOT_CONFORMANT;
printk(BIOS_ERR,
"EDID block does NOT conform to EDID 1.2!\n");
}
if (c.nonconformant_digital_display)
printk(BIOS_ERR,
"\tDigital display field contains garbage: %x\n",
@@ -1555,11 +1556,11 @@ int decode_edid(unsigned char *edid, int size, struct edid *out)
printk(BIOS_ERR,
"\tDetailed block string not properly terminated\n");
} else if (c.claims_one_point_oh) {
if (c.seen_non_detailed_descriptor)
c.conformant = 0;
if (!c.conformant)
if (c.seen_non_detailed_descriptor) {
c.conformant = EDID_NOT_CONFORMANT;
printk(BIOS_ERR,
"EDID block does NOT conform to EDID 1.0!\n");
}
if (c.seen_non_detailed_descriptor)
printk(BIOS_ERR,
"\tHas descriptor blocks other than detailed timings\n");
@@ -1576,7 +1577,7 @@ int decode_edid(unsigned char *edid, int size, struct edid *out)
!c.has_valid_descriptor_ordering ||
!c.has_valid_range_descriptor ||
!c.manufacturer_name_well_formed) {
c.conformant = 0;
c.conformant = EDID_NOT_CONFORMANT;
printk(BIOS_ERR, "EDID block does not conform at all!\n");
if (c.nonconformant_extension)
printk(BIOS_ERR,
@@ -1618,7 +1619,7 @@ int decode_edid(unsigned char *edid, int size, struct edid *out)
if (c.warning_zero_preferred_refresh)
printk(BIOS_ERR,
"Warning: CVT block does not set preferred refresh rate\n");
return !c.conformant;
return c.conformant;
}
/*