[PATCH v5 1/1] drm/bridge: Silence error messages upon probe deferral

[Alexander Stein]

When -EPROBE_DEFER is returned do not raise an error, but silently return
this error instead. Fixes error like this:
[drm:drm_bridge_attach] *ERROR* failed to attach bridge
  /soc at 0/bus at 30800000/mipi-dsi at 30a00000 to encoder None-34: -517
[drm:drm_bridge_attach] *ERROR* failed to attach bridge
  /soc at 0/bus at 30800000/mipi-dsi at 30a00000 to encoder None-34: -517

Signed-off-by: Alexander Stein <alexander.stein at ew.tq-group.com>
Reviewed-by: Robert Foss <rfoss at kernel.org>
---
Changes in v5:
* Added dev_err_probe() call if probe deferral occurs

 drivers/gpu/drm/drm_bridge.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index d44f055dbe3e7..c6af46dd02bfa 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -353,8 +353,13 @@ int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge,
 	bridge->encoder = NULL;
 	list_del(&bridge->chain_node);
 
-	DRM_ERROR("failed to attach bridge %pOF to encoder %s: %d\n",
-		  bridge->of_node, encoder->name, ret);
+	if (ret != -EPROBE_DEFER)
+		DRM_ERROR("failed to attach bridge %pOF to encoder %s: %d\n",
+			  bridge->of_node, encoder->name, ret);
+	else
+		dev_err_probe(encoder->dev->dev, -EPROBE_DEFER,
+			      "failed to attach bridge %pOF to encoder %s\n",
+			      bridge->of_node, encoder->name);
 
 	return ret;
 }
-- 
2.34.1