linux-kernel - [PATCH] drm: bridge: adv7511: use dev_err

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Message-Id: <20221017182810.1981638-1-a.fatoum@pengutronix.de>
Date:   Mon, 17 Oct 2022 20:28:09 +0200
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Archit Taneja <architt@...eaurora.org>
Cc:     kernel@...gutronix.de, Ahmad Fatoum <a.fatoum@...gutronix.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drm: bridge: adv7511: use dev_err_probe in probe function

adv7511 probe may need to be attempted multiple times before no
-EPROBE_DEFER is returned. Currently, every such probe results in
an error message:

[    4.534229] adv7511 1-003d: failed to find dsi host
[    4.580288] adv7511 1-003d: failed to find dsi host

This is misleading, as there is no error and probe deferral is normal
behavior. Fix this by using dev_err_probe that will suppress
-EPROBE_DEFER errors. While at it, we touch all dev_err in the probe
path. This makes the code more concise and included the error code
everywhere to aid user in debugging.

Fixes: 1e4d58cd7f88 ("drm/bridge: adv7533: Create a MIPI DSI device")
Signed-off-by: Ahmad Fatoum <a.fatoum@...gutronix.de>
---
 drivers/gpu/drm/bridge/adv7511/adv7511_drv.c |  6 ++----
 drivers/gpu/drm/bridge/adv7511/adv7533.c     | 18 ++++++------------
 2 files changed, 8 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
index 1c37779b434a..4148b6d6f151 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
+++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
@@ -1229,10 +1229,8 @@ static int adv7511_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
 		return ret;
 
 	ret = adv7511_init_regulators(adv7511);
-	if (ret) {
-		dev_err(dev, "failed to init regulators\n");
-		return ret;
-	}
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to init regulators\n");
 
 	/*
 	 * The power down GPIO is optional. If present, toggle it from active to
diff --git a/drivers/gpu/drm/bridge/adv7511/adv7533.c b/drivers/gpu/drm/bridge/adv7511/adv7533.c
index ef6270806d1d..b32b796c25fb 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7533.c
+++ b/drivers/gpu/drm/bridge/adv7511/adv7533.c
@@ -148,16 +148,12 @@ int adv7533_attach_dsi(struct adv7511 *adv)
 						 };
 
 	host = of_find_mipi_dsi_host_by_node(adv->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)) {
-		dev_err(dev, "failed to create dsi device\n");
-		return PTR_ERR(dsi);
-	}
+	if (IS_ERR(dsi))
+		return dev_err_probe(dev, PTR_ERR(dsi), "failed to create dsi device\n");
 
 	adv->dsi = dsi;
 
@@ -167,10 +163,8 @@ int adv7533_attach_dsi(struct adv7511 *adv)
 			  MIPI_DSI_MODE_NO_EOT_PACKET | MIPI_DSI_MODE_VIDEO_HSE;
 
 	ret = devm_mipi_dsi_attach(dev, dsi);
-	if (ret < 0) {
-		dev_err(dev, "failed to attach dsi to host\n");
-		return ret;
-	}
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "failed to attach dsi to host\n");
 
 	return 0;
 }
-- 
2.30.2