From: Kyle McMartin <kyle@redhat.com>
Date: Wed, 25 Feb 2009 01:31:53 +0000 (-0500)
Subject: drm: edid revision 0 is valid
X-Git-Tag: firefly_0821_release~15441^2~2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=d61e7380b402a481ab1fa8027068a24918f701c8;p=firefly-linux-kernel-4.4.55.git

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 e902b1cefc06..a839a28d8ee6 100644
--- 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;
 	}