linux-kernel - [PATCH v3 1/9] drm/bridge: anx7625: Don't log an error when DSI host can't be found

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Message-Id: <20240415-anx7625-defer-log-no-dsi-host-v3-1-619a28148e5c@collabora.com>
Date: Mon, 15 Apr 2024 17:49:29 -0400
From: Nícolas F. R. A. Prado <nfraprado@...labora.com>
To: Andrzej Hajda <andrzej.hajda@...el.com>, 
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>, 
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>, 
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
 owen <qwt9588@...il.com>, Jagan Teki <jagan@...rulasolutions.com>, 
 Marek Vasut <marex@...x.de>, Adrien Grassein <adrien.grassein@...il.com>, 
 Srinivas Kandagatla <srinivas.kandagatla@...aro.org>, 
 Sam Ravnborg <sam@...nborg.org>, Bjorn Andersson <andersson@...nel.org>, 
 Vinod Koul <vkoul@...nel.org>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
 Vinay Simha BN <simhavcs@...il.com>, 
 Christopher Vollo <chris@...ewoutreach.org>, 
 Jessica Zhang <quic_jesszhan@...cinc.com>, 
 Marijn Suijten <marijn.suijten@...ainline.org>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>
Cc: kernel@...labora.com, dri-devel@...ts.freedesktop.org, 
 linux-kernel@...r.kernel.org, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>, 
 Nícolas F. R. A. Prado <nfraprado@...labora.com>
Subject: [PATCH v3 1/9] drm/bridge: anx7625: Don't log an error when DSI
 host can't be found

Given that failing to find a DSI host causes the driver to defer probe,
make use of dev_err_probe() to log the reason. This makes the defer
probe reason available and avoids alerting userspace about something
that is not necessarily an error.

Fixes: 269332997a16 ("drm/bridge: anx7625: Return -EPROBE_DEFER if the dsi host was not found")
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
---
 drivers/gpu/drm/bridge/analogix/anx7625.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index 9d96d28d6fe8..02bf45005307 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -2066,10 +2066,8 @@ static int anx7625_setup_dsi_device(struct anx7625_data *ctx)
 	};

 	host = of_find_mipi_dsi_host_by_node(ctx->pdata.mipi_host_node);
-	if (!host) {
-		DRM_DEV_ERROR(dev, "fail to find dsi host.\n");
-		return -EPROBE_DEFER;
-	}
+	if (!host)
+		return dev_err_probe(dev, -EPROBE_DEFER, "fail to find dsi host.\n");

 	dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
 	if (IS_ERR(dsi)) {

-- 
2.44.0