linux-kernel - Re: [PATCH v4 1/1] drm/bridge: Silence error messages upon probe deferral

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Date: Tue, 2 Jul 2024 14:41:15 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Alexander Stein <alexander.stein@...tq-group.com>
Cc: 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>, dri-devel@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/1] drm/bridge: Silence error messages upon probe
 deferral

On Fri, Jun 28, 2024 at 01:51:30PM GMT, Alexander Stein wrote:
> When -EPROBE_DEFER is returned do not raise an error, but silently return
> this error instead. Fixes error like this:
> [drm:drm_bridge_attach] *ERROR* failed to attach bridge
>   /soc@...us@...00000/mipi-dsi@...00000 to encoder None-34: -517
> [drm:drm_bridge_attach] *ERROR* failed to attach bridge
>   /soc@...us@...00000/mipi-dsi@...00000 to encoder None-34: -517
> 
> Signed-off-by: Alexander Stein <alexander.stein@...tq-group.com>
> Reviewed-by: Robert Foss <rfoss@...nel.org>
> ---
> Changes in v4:
> * Rebased to next-20240628
> 
>  drivers/gpu/drm/drm_bridge.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
> index d44f055dbe3e7..3e72dfd941577 100644
> --- a/drivers/gpu/drm/drm_bridge.c
> +++ b/drivers/gpu/drm/drm_bridge.c
> @@ -353,8 +353,9 @@ int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge,
>  	bridge->encoder = NULL;
>  	list_del(&bridge->chain_node);
>  
> -	DRM_ERROR("failed to attach bridge %pOF to encoder %s: %d\n",
> -		  bridge->of_node, encoder->name, ret);
> +	if (ret != -EPROBE_DEFER)
> +		DRM_ERROR("failed to attach bridge %pOF to encoder %s: %d\n",
> +			  bridge->of_node, encoder->name, ret);

Maybe?

else
   dev_err_probe(encoder->dev->dev, -EPROBE_DEFER, "failed to attach...\n");

>  
>  	return ret;
>  }
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry