linux-kernel - Re: [PATCH v2 1/1] drm/bridge: imx93-mipi-dsi: Use dev_err

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Message-ID: <091f1d5c-0bff-4dcb-b823-b82989eac628@nxp.com>
Date: Wed, 29 May 2024 15:50:24 +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>, Daniel Vetter <daniel@...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 1/1] drm/bridge: imx93-mipi-dsi: Use dev_err_probe

On 05/29/2024, Alexander Stein wrote:
> Although very unlike to occur (media_blk_ctrl needs 'syscon' compatible
> removed), it lines up with the other error paths in probe function.

Why media_blk_ctrl needs 'syscon' compatible removed?

device_node_get_regmap may return error pointer other than
ERR_PTR(-EPROBE_DEFER), like ERR_PTR(-ENOMEM).

struct regmap *syscon_node_to_regmap(struct device_node *np)                     
{                                                                                
        if (!of_device_is_compatible(np, "syscon"))                              
                return ERR_PTR(-EINVAL);                                         
                                                                                 
        return device_node_get_regmap(np, true);                                 
}                                                                                
EXPORT_SYMBOL_GPL(syscon_node_to_regmap);

Regard,
Liu Ying

> 
> Signed-off-by: Alexander Stein <alexander.stein@...tq-group.com>
> ---
> Changes in v2:
> * Removed unused variable
> * Added missing \n at end of string
> 
>  drivers/gpu/drm/bridge/imx/imx93-mipi-dsi.c | 9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/imx/imx93-mipi-dsi.c b/drivers/gpu/drm/bridge/imx/imx93-mipi-dsi.c
> index 2347f8dd632f9..13025f47f3902 100644
> --- a/drivers/gpu/drm/bridge/imx/imx93-mipi-dsi.c
> +++ b/drivers/gpu/drm/bridge/imx/imx93-mipi-dsi.c
> @@ -834,18 +834,15 @@ static int imx93_dsi_probe(struct platform_device *pdev)
>  	struct device *dev = &pdev->dev;
>  	struct device_node *np = dev->of_node;
>  	struct imx93_dsi *dsi;
> -	int ret;
>  
>  	dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
>  	if (!dsi)
>  		return -ENOMEM;
>  
>  	dsi->regmap = syscon_regmap_lookup_by_phandle(np, "fsl,media-blk-ctrl");
> -	if (IS_ERR(dsi->regmap)) {
> -		ret = PTR_ERR(dsi->regmap);
> -		dev_err(dev, "failed to get block ctrl regmap: %d\n", ret);
> -		return ret;
> -	}
> +	if (IS_ERR(dsi->regmap))
> +		return dev_err_probe(dev, PTR_ERR(dsi->regmap),
> +				     "failed to get block ctrl regmap\n");
>  
>  	dsi->clk_pixel = devm_clk_get(dev, "pix");
>  	if (IS_ERR(dsi->clk_pixel))