diff options
| author | Adam Jackson <ajax@redhat.com> | 2012-05-30 22:42:39 +0200 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2012-06-01 18:00:23 +0200 |
| commit | 47819ba234d41465b76f179ba674ff549255a5d2 (patch) | |
| tree | 749fcaa583791a0f2ebcde8d56e05cb9d57ba99c /drivers/gpu | |
| parent | drm/radeon: fix regression in UMS CS ioctl (diff) | |
| download | linux-47819ba234d41465b76f179ba674ff549255a5d2.tar.xz linux-47819ba234d41465b76f179ba674ff549255a5d2.zip | |
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>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/drm_edid.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index c3b5139eba7f..eb92fe257a39 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" @@ -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 { |