drm: edid revision 0 is valid

edid->revision == 0 should be valid (at least, so the error message
indicates. :) and wikipedia seems to indicate that EDID 1.0 existed.

We can dump the entire check, since edid->revision is a u8, so
it can't ever be less than 0.

Marko reports in RH bz#476735 that his monitor claims to be
EDID 1.0, and therefore hits the check and is stuck at 800x600 because
of it.

Reported-by: Marko Ristola <marko.ristola@kolumbus.fi>
Signed-off-by: Kyle McMartin <kyle@redhat.com>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Dave Airlie <airlied@linux.ie>

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index e902b1cefc061d018ee1f0eee622a91bfab8e7d1..a839a28d8ee606763ad213d9dc785bc4dde0dd6c 100644 (file)
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -125,7 +125,7 @@ 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 <= 0 || edid->revision > 3) {
+       if (edid->revision > 3) {
                DRM_ERROR("EDID has minor version %d, which is not between 0-3\n", edid->revision);
                goto bad;
        }