linux-kernel - Re: [PATCH] drm/bridge: Ignore -EPROBE

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Date:   Tue, 12 Oct 2021 22:38:40 +0200
From:   Guido Günther <agx@...xcpu.org>
To:     Sam Ravnborg <sam@...nborg.org>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Jyri Sarha <jyri.sarha@....fi>,
        Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/bridge: Ignore -EPROBE_DEFER when bridge attach fails

Hi,
On Tue, Oct 12, 2021 at 10:08:28PM +0200, Sam Ravnborg wrote:
> Hi Guido,
> 
> On Tue, Oct 12, 2021 at 09:58:58PM +0200, Guido Günther wrote:
> > Otherwise logs are filled with
> > 
> >   [drm:drm_bridge_attach] *ERROR* failed to attach bridge /soc@...us@...00000/mipi-dsi@...0 0000 to encoder None-34: -517
> > 
> > when the bridge isn't ready yet.
> > 
> > Fixes: fb8d617f8fd6 ("drm/bridge: Centralize error message when bridge attach fails")
> > Signed-off-by: Guido Günther <agx@...xcpu.org>
> > ---
> >  drivers/gpu/drm/drm_bridge.c | 11 ++++++-----
> >  1 file changed, 6 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
> > index a8ed66751c2d..f0508e85ae98 100644
> > --- a/drivers/gpu/drm/drm_bridge.c
> > +++ b/drivers/gpu/drm/drm_bridge.c
> > @@ -227,14 +227,15 @@ int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge,
> >  	bridge->encoder = NULL;
> >  	list_del(&bridge->chain_node);
> >  
> > +	if (ret != -EPROBE_DEFER) {
> >  #ifdef CONFIG_OF
> > -	DRM_ERROR("failed to attach bridge %pOF to encoder %s: %d\n",
> > -		  bridge->of_node, encoder->name, ret);
> > +		DRM_ERROR("failed to attach bridge %pOF to encoder %s: %d\n",
> > +			  bridge->of_node, encoder->name, ret);
> 
> It would be better to use drm_probe_err().

That's what i thought initially but since the rest here uses DRM_*
logging i stuck with it. Happy to change that though.
Cheers,
 -- Guido

> 
> 	Sam
> 
> >  #else
> > -	DRM_ERROR("failed to attach bridge to encoder %s: %d\n",
> > -		  encoder->name, ret);
> > +		DRM_ERROR("failed to attach bridge to encoder %s: %d\n",
> > +			  encoder->name, ret);
> >  #endif
> > -
> > +	}
> >  	return ret;
> >  }
> >  EXPORT_SYMBOL(drm_bridge_attach);
> > -- 
> > 2.33.0
>