drm/edid: Ignore bad standard timings.

Signed-off-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 3326987a988b..dd35dc11ffd4 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -502,6 +502,19 @@ static struct drm_display_mode *drm_find_dmt(struct drm_device *dev,
         }
         return mode;
 }
+
+/*
+ * 0 is reserved.  The spec says 0x01 fill for unused timings.  Some old
+ * monitors fill with ascii space (0x20) instead.
+ */
+static int
+bad_std_timing(u8 a, u8 b)
+{
+        return (a == 0x00 && b == 0x00) ||
+               (a == 0x01 && b == 0x01) ||
+               (a == 0x20 && b == 0x20);
+}
+
 /**
  * drm_mode_std - convert standard mode info (width, height, refresh) into mode
  * @t: standard timing params
@@ -525,6 +538,9 @@ struct drm_display_mode *drm_mode_std(struct drm_device *dev,
         unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK)
                 >> EDID_TIMING_VFREQ_SHIFT;
 
+        if (bad_std_timing(t->hsize, t->vfreq_aspect))
+                return NULL;
+
         /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */
         hsize = t->hsize * 8 + 248;
         /* vrefresh_rate = vfreq + 60 */