linux-kernel - Re: [PATCH v2 9/9] drm/panel: truly-nt35597: Don't log an error when DSI host can't be found

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Message-ID: <20240301063020.GL30889@pendragon.ideasonboard.com>
Date: Fri, 1 Mar 2024 08:30:20 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Nícolas F. R. A. Prado <nfraprado@...labora.com>
Cc: 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>,
	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>,
	owen <qwt9588@...il.com>, Jagan Teki <jagan@...rulasolutions.com>,
	Marek Vasut <marex@...x.de>,
	Adrien Grassein <adrien.grassein@...il.com>,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	Sam Ravnborg <sam@...nborg.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Vinod Koul <vkoul@...nel.org>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Vinay Simha BN <simhavcs@...il.com>,
	Christopher Vollo <chris@...ewoutreach.org>,
	Jessica Zhang <quic_jesszhan@...cinc.com>,
	Marijn Suijten <marijn.suijten@...ainline.org>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>,
	kernel@...labora.com, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH v2 9/9] drm/panel: truly-nt35597: Don't log an error when
 DSI host can't be found

Hi Nícolas,

Thank you for the patch.

On Thu, Feb 29, 2024 at 07:12:15PM -0500, Nícolas F. R. A. Prado wrote:
> Given that failing to find a DSI host causes the driver to defer probe,
> make use of dev_err_probe() to log the reason. This makes the defer
> probe reason available and avoids alerting userspace about something
> that is not necessarily an error.
> 
> Suggested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
> ---
>  drivers/gpu/drm/panel/panel-truly-nt35597.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panel/panel-truly-nt35597.c b/drivers/gpu/drm/panel/panel-truly-nt35597.c
> index b73448cf349d..d447db912a61 100644
> --- a/drivers/gpu/drm/panel/panel-truly-nt35597.c
> +++ b/drivers/gpu/drm/panel/panel-truly-nt35597.c
> @@ -550,10 +550,8 @@ static int truly_nt35597_probe(struct mipi_dsi_device *dsi)
>  
>  	dsi1_host = of_find_mipi_dsi_host_by_node(dsi1);
>  	of_node_put(dsi1);
> -	if (!dsi1_host) {
> -		dev_err(dev, "failed to find dsi host\n");
> -		return -EPROBE_DEFER;
> -	}
> +	if (!dsi1_host)
> +		return dev_err_probe(dev, -EPROBE_DEFER, "failed to find dsi host\n");

		return dev_err_probe(dev, -EPROBE_DEFER,
				     "failed to find dsi host\n");

With this addressed,

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

>  
>  	/* register the second DSI device */
>  	dsi1_device = mipi_dsi_device_register_full(dsi1_host, &info);
> 

-- 
Regards,

Laurent Pinchart