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

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Date: Thu, 4 Jan 2024 15:09:21 +0100
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Quentin Schulz <foss+kernel@...il.net>,
 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: Heiko Stuebner <heiko@...ech.de>, dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org,
 Quentin Schulz <quentin.schulz@...obroma-systems.com>
Subject: Re: [PATCH 1/2] drm/panel: ltk050h3146w: only print message when GPIO
 getting is not EPROBE_DEFER

Le 04/01/2024 à 13:41, Quentin Schulz a écrit :
> 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>

Reviewed-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>

> ---
>   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)) {
>