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From: =?utf-8?q?N=C3=ADcolas_F=2E_R=2E_A=2E_Prado?= <nfraprado@collabora.com>
Date: Mon, 15 Apr 2024 17:49:31 -0400
Subject: [PATCH v3 3/9] drm/bridge: lt8912b: 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-v3-3-619a28148e5c@collabora.com>
References: <20240415-anx7625-defer-log-no-dsi-host-v3-0-619a28148e5c@collabora.com>
In-Reply-To: <20240415-anx7625-defer-log-no-dsi-host-v3-0-619a28148e5c@collabora.com>
To: Andrzej Hajda <andrzej.hajda@intel.com>, 
 Neil Armstrong <neil.armstrong@linaro.org>, Robert Foss <rfoss@kernel.org>, 
 Laurent Pinchart <Laurent.pinchart@ideasonboard.com>, 
 Jonas Karlman <jonas@kwiboo.se>, Jernej Skrabec <jernej.skrabec@gmail.com>, 
 Maarten Lankhorst <maarten.lankhorst@linux.intel.com>, 
 Maxime Ripard <mripard@kernel.org>, Thomas Zimmermann <tzimmermann@suse.de>, 
 David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>, 
 owen <qwt9588@gmail.com>, Jagan Teki <jagan@amarulasolutions.com>, 
 Marek Vasut <marex@denx.de>, Adrien Grassein <adrien.grassein@gmail.com>, 
 Srinivas Kandagatla <srinivas.kandagatla@linaro.org>, 
 Sam Ravnborg <sam@ravnborg.org>, Bjorn Andersson <andersson@kernel.org>, 
 Vinod Koul <vkoul@kernel.org>, 
 Dmitry Baryshkov <dmitry.baryshkov@linaro.org>, 
 Vinay Simha BN <simhavcs@gmail.com>, 
 Christopher Vollo <chris@renewoutreach.org>, 
 Jessica Zhang <quic_jesszhan@quicinc.com>, 
 Marijn Suijten <marijn.suijten@somainline.org>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
Cc: kernel@collabora.com, dri-devel@lists.freedesktop.org, 
 linux-kernel@vger.kernel.org, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>, 
 Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>, 
 =?utf-8?q?N=C3=ADcolas_F=2E_R=2E_A=2E_Prado?= <nfraprado@collabora.com>

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: 30e2ae943c26 ("drm/bridge: Introduce LT8912B DSI to HDMI bridge")
Suggested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
---
 drivers/gpu/drm/bridge/lontium-lt8912b.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/bridge/lontium-lt8912b.c b/drivers/gpu/drm/bridge/lontium-lt8912b.c
index 4b2ae27f0a57..1a9defa15663 100644
--- a/drivers/gpu/drm/bridge/lontium-lt8912b.c
+++ b/drivers/gpu/drm/bridge/lontium-lt8912b.c
@@ -494,10 +494,8 @@ static int lt8912_attach_dsi(struct lt8912 *lt)
 						 };
 
 	host = of_find_mipi_dsi_host_by_node(lt->host_node);
-	if (!host) {
-		dev_err(dev, "failed to find dsi host\n");
-		return -EPROBE_DEFER;
-	}
+	if (!host)
+		return dev_err_probe(dev, -EPROBE_DEFER, "failed to find dsi host\n");
 
 	dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
 	if (IS_ERR(dsi)) {

-- 
2.44.0