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path: root/drivers/gpu/drm/drm_edid.c
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Diffstat (limited to 'drivers/gpu/drm/drm_edid.c')
-rw-r--r--drivers/gpu/drm/drm_edid.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 5a18b0d..0a407dbc 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -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"
@@ -145,6 +145,11 @@ 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
* doesn't check out, or 1 if it's valid.
@@ -155,10 +160,13 @@ bool drm_edid_block_valid(u8 *raw_edid)
u8 csum = 0;
struct edid *edid = (struct edid *)raw_edid;
+ if (edid_fixup > 8 || edid_fixup < 0)
+ edid_fixup = 6;
+
if (raw_edid[0] == 0x00) {
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 {