drm: do not debug log about missing CEA extensions on NULL edid

Make the drm_edid_to_eld() function useful for resetting, not just
setting, the ELD and HDMI VSDB data, without debug warnings about
missing CEA extensions.

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1487344854-18777-3-git-send-email-jani.nikula@intel.com

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 24e7b282f16c..4bb50e0e7110 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -3437,6 +3437,9 @@ void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid)
         connector->video_latency[1] = 0;
         connector->audio_latency[1] = 0;
 
+        if (!edid)
+                return;
+
         cea = drm_find_cea_extension(edid);
         if (!cea) {
                 DRM_DEBUG_KMS("ELD: no CEA Extension found\n");