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drm/edid: Make the header fixup threshold tunable 

6 bytes seems to be a reasonable default so far, but for the desperate
it's worth exposing this.

[airlied: change include to module.h for this]

Bugzilla: https://bugzilla.redhat.com/582559
Signed-off-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Adam Jackson 2012-05-30 16:42:39 -04:00 committed by Dave Airlie
parent 9b00147d9f
commit 47819ba234
1 changed files with 9 additions and 2 deletions
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11
drivers/gpu/drm/drm_edid.c
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@ -30,7 +30,7 @@
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/export.h>
#include <linux/module.h>
#include "drmP.h"
#include "drm_edid.h"
#include "drm_edid_modes.h"
@ -149,6 +149,10 @@ int drm_edid_header_is_valid(const u8 *raw_edid)
}
EXPORT_SYMBOL(drm_edid_header_is_valid);
static int edid_fixup __read_mostly = 6;
module_param_named(edid_fixup, edid_fixup, int, 0400);
MODULE_PARM_DESC(edid_fixup,
"Minimum number of valid EDID header bytes (0-8, default 6)");
/*
* Sanity check the EDID block (base or extension). Return 0 if the block
@ -160,10 +164,13 @@ bool drm_edid_block_valid(u8 *raw_edid, int block)
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 >= 6) {
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 {