drm: fix EDID backward compat check

EDIDs should be backward compatible, so don't bail if we see a version
of 3 (which is out there now) and print a message if we see something
newer, but allow it to be parsed.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 2 insertions, 4 deletions

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 2c4a340e682f..ca9c61656714 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -125,10 +125,8 @@ static bool edid_is_valid(struct edid *edid)
                 DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version);
                 goto bad;
         }
-        if (edid->revision > 3) {
-                DRM_ERROR("EDID has minor version %d, which is not between 0-3\n", edid->revision);
-                goto bad;
-        }
+        if (edid->revision > 4)
+                DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n");
 
         for (i = 0; i < EDID_LENGTH; i++)
                 csum += raw_edid[i];