linux-kernel - Re: [drm:simple_bridge_attach [simple_bridge]] *ERROR* Fix bridge driver to make connector optional!

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Message-ID: <20200417125840.GB4748@pendragon.ideasonboard.com>
Date:   Fri, 17 Apr 2020 15:58:40 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     "H. Nikolaus Schaller" <hns@...delico.com>,
        Discussions about the Letux Kernel 
        <letux-kernel@...nphoenux.org>,
        linux-omap <linux-omap@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:DRM PANEL DRIVERS" <dri-devel@...ts.freedesktop.org>
Subject: Re: [drm:simple_bridge_attach [simple_bridge]] *ERROR* Fix bridge
 driver to make connector optional!

Hello,

On Fri, Apr 17, 2020 at 02:44:22PM +0200, Maxime Ripard wrote:
> On Fri, Apr 17, 2020 at 02:18:11PM +0200, H. Nikolaus Schaller wrote:
> > Hi Maxime,
> > I have started to test v5.7-rc1 and can't fully boot the GTA04
> > device any more.
> > 
> > What I see in the log is:
> > 
> > [   28.567840] [drm:simple_bridge_attach [simple_bridge]] *ERROR* Fix bridge driver to make connector optional!
> > [   28.567871] omapdrm omapdrm.0: unable to attach bridge /ocp@...00000/dss@...50000/encoder@...50c00
> > [   28.786529] omapdrm omapdrm.0: omap_modeset_init failed: ret=-22
> > [   28.841552] omapdrm: probe of omapdrm.0 failed with error -22
> > 
> > This device uses the ti,opa362 chip which did have a dedicated
> > omapdss driver before (which is removed now) and which seems to
> > be supported by the simple_bridge now.
> > 
> > The opa362 is sitting in the video out path from
> > 
> > 	omapdrm -> venc -> opa362 -> video-out-connector.
> > 
> > What does this error mean? How can it be fixed?
> 
> -22 is usually EINVAL, which can be pretty much anything. A good thing to do
>  would be to bisect to see which actual commit broke it, but if I was to bet on
>  something I guess it would be
> 
> https://lore.kernel.org/dri-devel/20200226112514.12455-1-laurent.pinchart@ideasonboard.com/

Would "[PATCH 0/2] drm: bridge: simple-bridge: Enable usage with DRM
bridge connector helper" solve it ?

-- 
Regards,

Laurent Pinchart