linux-kernel - [PATCH 1/2] drm/panel: ltk050h3146w: only print message when GPIO getting is not EPROBE

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Message-ID: <20240104-ltk-dev_err_probe-v1-1-8ef3c0b585d8@theobroma-systems.com>
Date: Thu,  4 Jan 2024 13:41:57 +0100
From: Quentin Schulz <foss+kernel@...il.net>
To: Neil Armstrong <neil.armstrong@...aro.org>,
	Jessica Zhang <quic_jesszhan@...cinc.com>,
	Sam Ravnborg <sam@...nborg.org>,
	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>
Cc: Quentin Schulz <foss+kernel@...il.net>,
	Heiko Stuebner <heiko@...ech.de>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Quentin Schulz <quentin.schulz@...obroma-systems.com>
Subject: [PATCH 1/2] drm/panel: ltk050h3146w: only print message when GPIO getting is not EPROBE_DEFER

From: Quentin Schulz <quentin.schulz@...obroma-systems.com>

devm_gpiod_get_optional may return EPROBE_DEFER in case the GPIO
controller isn't yet probed when the panel driver is being probed.

In that case, a spurious and confusing error message about not being
able to get the reset GPIO is printed even though later on the device
actually manages to get probed.

Use dev_err_probe instead so that the message is only printed when it
truly matters.

Cc: Quentin Schulz <foss+kernel@...il.net>
Signed-off-by: Quentin Schulz <quentin.schulz@...obroma-systems.com>
---
 drivers/gpu/drm/panel/panel-leadtek-ltk050h3146w.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-leadtek-ltk050h3146w.c b/drivers/gpu/drm/panel/panel-leadtek-ltk050h3146w.c
index 30919c872ac8d..ecfa4181c4fd9 100644
--- a/drivers/gpu/drm/panel/panel-leadtek-ltk050h3146w.c
+++ b/drivers/gpu/drm/panel/panel-leadtek-ltk050h3146w.c
@@ -646,10 +646,8 @@ static int ltk050h3146w_probe(struct mipi_dsi_device *dsi)
 		return -EINVAL;
 
 	ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
-	if (IS_ERR(ctx->reset_gpio)) {
-		dev_err(dev, "cannot get reset gpio\n");
-		return PTR_ERR(ctx->reset_gpio);
-	}
+	if (IS_ERR(ctx->reset_gpio))
+		return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio), "cannot get reset gpio\n");
 
 	ctx->vci = devm_regulator_get(dev, "vci");
 	if (IS_ERR(ctx->vci)) {

-- 
2.43.0