linux-kernel - [PATCH] drm/bridge: Ignore -EPROBE

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Date:   Tue, 12 Oct 2021 21:58:58 +0200
From:   Guido Günther <agx@...xcpu.org>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Jyri Sarha <jyri.sarha@....fi>,
        Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drm/bridge: Ignore -EPROBE_DEFER when bridge attach fails

Otherwise logs are filled with

  [drm:drm_bridge_attach] *ERROR* failed to attach bridge /soc@...us@...00000/mipi-dsi@...0 0000 to encoder None-34: -517

when the bridge isn't ready yet.

Fixes: fb8d617f8fd6 ("drm/bridge: Centralize error message when bridge attach fails")
Signed-off-by: Guido Günther <agx@...xcpu.org>
---
 drivers/gpu/drm/drm_bridge.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index a8ed66751c2d..f0508e85ae98 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -227,14 +227,15 @@ int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge,
 	bridge->encoder = NULL;
 	list_del(&bridge->chain_node);
 
+	if (ret != -EPROBE_DEFER) {
 #ifdef CONFIG_OF
-	DRM_ERROR("failed to attach bridge %pOF to encoder %s: %d\n",
-		  bridge->of_node, encoder->name, ret);
+		DRM_ERROR("failed to attach bridge %pOF to encoder %s: %d\n",
+			  bridge->of_node, encoder->name, ret);
 #else
-	DRM_ERROR("failed to attach bridge to encoder %s: %d\n",
-		  encoder->name, ret);
+		DRM_ERROR("failed to attach bridge to encoder %s: %d\n",
+			  encoder->name, ret);
 #endif
-
+	}
 	return ret;
 }
 EXPORT_SYMBOL(drm_bridge_attach);
-- 
2.33.0