linux-kernel - Re: [PATCH v1] drm/bridge: lt8912b: return EPROBE

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Date:   Wed, 22 Mar 2023 16:12:55 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Francesco Dolcini <francesco@...cini.it>
Cc:     Adrien Grassein <adrien.grassein@...il.com>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org,
        Matheus Castello <matheus.castello@...adex.com>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Francesco Dolcini <francesco.dolcini@...adex.com>
Subject: Re: [PATCH v1] drm/bridge: lt8912b: return EPROBE_DEFER if bridge is
 not found

Hi Francesco,

Thank you for the patch.

On Wed, Mar 22, 2023 at 03:03:09PM +0100, Francesco Dolcini wrote:
> From: Matheus Castello <matheus.castello@...adex.com>
> 
> Returns EPROBE_DEFER when of_drm_find_bridge() fails, this is consistent
> with what all the other DRM bridge drivers are doing and this is
> required since the bridge might not be there when the driver is probed
> and this should not be a fatal failure.
> 
> Cc: <stable@...r.kernel.org>
> Fixes: 30e2ae943c26 ("drm/bridge: Introduce LT8912B DSI to HDMI bridge")
> Signed-off-by: Matheus Castello <matheus.castello@...adex.com>
> Signed-off-by: Francesco Dolcini <francesco.dolcini@...adex.com>
> ---
>  drivers/gpu/drm/bridge/lontium-lt8912b.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/lontium-lt8912b.c b/drivers/gpu/drm/bridge/lontium-lt8912b.c
> index 2019a8167d69..fec02e47cfdb 100644
> --- a/drivers/gpu/drm/bridge/lontium-lt8912b.c
> +++ b/drivers/gpu/drm/bridge/lontium-lt8912b.c
> @@ -676,8 +676,8 @@ static int lt8912_parse_dt(struct lt8912 *lt)
>  
>  	lt->hdmi_port = of_drm_find_bridge(port_node);
>  	if (!lt->hdmi_port) {
> -		dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__);
> -		ret = -ENODEV;
> +		dev_dbg(lt->dev, "%s: Failed to get hdmi port\n", __func__);

Please use dev_err_probe(). Apart from that, the patch looks fine to me.

> +		ret = -EPROBE_DEFER;
>  		goto err_free_host_node;
>  	}
>  

-- 
Regards,

Laurent Pinchart