linux-kernel - Re: [PATCH v2 1/4] drm/bridge: imx8qxp-pxl2dpi: Use dev_err

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Message-ID: <add11437-4fa8-489a-9cde-9c08cfd71db3@nxp.com>
Date: Wed, 8 Jan 2025 11:22:19 +0800
From: Liu Ying <victor.liu@....com>
To: Alexander Stein <alexander.stein@...tq-group.com>,
 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>, Simona Vetter <simona@...ll.ch>,
 Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>,
 Pengutronix Kernel Team <kernel@...gutronix.de>,
 Fabio Estevam <festevam@...il.com>
Cc: dri-devel@...ts.freedesktop.org, imx@...ts.linux.dev,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/4] drm/bridge: imx8qxp-pxl2dpi: Use dev_err_probe

On 01/07/2025, Alexander Stein wrote:
> This simplifies the code and gives additional information upon deferral.
> 
> Signed-off-by: Alexander Stein <alexander.stein@...tq-group.com>
> ---
>  drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c | 26 ++++++--------------
>  1 file changed, 7 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c b/drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c
> index 65cf3a6c8ec69..038eaff889bb7 100644
> --- a/drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c
> +++ b/drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c
> @@ -398,20 +398,12 @@ static int imx8qxp_pxl2dpi_bridge_probe(struct platform_device *pdev)
>  		return -ENOMEM;
>  
>  	p2d->regmap = syscon_node_to_regmap(np->parent);
> -	if (IS_ERR(p2d->regmap)) {
> -		ret = PTR_ERR(p2d->regmap);
> -		if (ret != -EPROBE_DEFER)
> -			DRM_DEV_ERROR(dev, "failed to get regmap: %d\n", ret);
> -		return ret;
> -	}
> +	if (IS_ERR(p2d->regmap))
> +		return dev_err_probe(dev, ret, "failed to get regmap\n");

s/ret/PTR_ERR(p2d->regmap)/

>  
>  	ret = imx_scu_get_handle(&p2d->ipc_handle);
> -	if (ret) {
> -		if (ret != -EPROBE_DEFER)
> -			DRM_DEV_ERROR(dev, "failed to get SCU ipc handle: %d\n",
> -				      ret);
> -		return ret;
> -	}
> +	if (ret)
> +		return dev_err_probe(dev, ret, "failed to get SCU ipc handle\n");
>  
>  	p2d->dev = dev;
>  
> @@ -422,13 +414,9 @@ static int imx8qxp_pxl2dpi_bridge_probe(struct platform_device *pdev)
>  	}
>  
>  	p2d->next_bridge = imx8qxp_pxl2dpi_find_next_bridge(p2d);
> -	if (IS_ERR(p2d->next_bridge)) {
> -		ret = PTR_ERR(p2d->next_bridge);
> -		if (ret != -EPROBE_DEFER)
> -			DRM_DEV_ERROR(dev, "failed to find next bridge: %d\n",
> -				      ret);
> -		return ret;
> -	}
> +	if (IS_ERR(p2d->next_bridge))
> +		return dev_err_probe(dev, PTR_ERR(p2d->next_bridge),
> +				     "failed to find next bridge\n");
>  
>  	ret = imx8qxp_pxl2dpi_set_pixel_link_sel(p2d);
>  	if (ret)

imx8qxp_pxl2dpi_parse_dt_companion() may return -EPROBE_DEFER too, so it needs
to be changed.

-- 
Regards,
Liu Ying