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drm: Separate EDID Header Check from EDID Block Check

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Provides function drm_edid_header_is_valid() for EDID header check
    and replaces EDID header check part of function drm_edid_block_valid()
    by a call of drm_edid_header_is_valid().
    This is a prerequisite to extend DDC probing, e. g. in function
    radeon_ddc_probe() for Radeon devices, by a central EDID header check.

    Tested for kernel 2.6.35, 2.6.38 and 3.0

Cc: <[email protected]>
Signed-off-by: Thomas Reim <[email protected]>
Reviewed-by: Alex Deucher <[email protected]>
Acked-by: Stephen Michaels <[email protected]>
Signed-off-by: Dave Airlie <[email protected]>
This commit is contained in:
Thomas Reim 2011-07-29 14:28:57 +00:00 • committed by Dave Airlie
commit 051963d483
2 changed files with 19 additions and 6 deletions
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24
drivers/gpu/drm/drm_edid.c
View file

@ -127,6 +127,23 @@ static const u8 edid_header[] = {
0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00
};
/*
* Sanity check the header of the base EDID block. Return 8 if the header
* is perfect, down to 0 if it's totally wrong.
*/
int drm_edid_header_is_valid(const u8 *raw_edid)
{
int i, score = 0;
for (i = 0; i < sizeof(edid_header); i++)
if (raw_edid[i] == edid_header[i])
score++;
return score;
}
EXPORT_SYMBOL(drm_edid_header_is_valid);
/*
* Sanity check the EDID block (base or extension). Return 0 if the block
* doesn't check out, or 1 if it's valid.
@ -139,12 +156,7 @@ drm_edid_block_valid(u8 *raw_edid)
struct edid *edid = (struct edid *)raw_edid;
if (raw_edid[0] == 0x00) {
int score = 0;
for (i = 0; i < sizeof(edid_header); i++)
if (raw_edid[i] == edid_header[i])
score++;
int score = drm_edid_header_is_valid(raw_edid);
if (score == 8) ;
else if (score >= 6) {
DRM_DEBUG("Fixing EDID header, your hardware may be failing\n");