drm: Only print a debug message when the polled connector has changed

Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index 9085db634092ac72483dde72b8a00bf4eced8f28..ed1334e27c33283442fceb604892e55666bdfe2c 100644 (file)
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -1007,13 +1007,20 @@ static void output_poll_execute(struct work_struct *work)
                        continue;
 
                connector->status = connector->funcs->detect(connector, false);
-               DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
-                             connector->base.id,
-                             drm_get_connector_name(connector),
-                             drm_get_connector_status_name(old_status),
-                             drm_get_connector_status_name(connector->status));
-               if (old_status != connector->status)
+               if (old_status != connector->status) {
+                       const char *old, *new;
+
+                       old = drm_get_connector_status_name(old_status);
+                       new = drm_get_connector_status_name(connector->status);
+
+                       DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
+                                     "status updated from %s to %s\n",
+                                     connector->base.id,
+                                     drm_get_connector_name(connector),
+                                     old, new);
+
                        changed = true;
+               }
        }
 
        mutex_unlock(&dev->mode_config.mutex);