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Date:   Fri, 17 Apr 2020 14:44:22 +0200
From:   Maxime Ripard <maxime@cerno.tech>
To:     "H. Nikolaus Schaller" <hns@goldelico.com>
Cc:     Discussions about the Letux Kernel <letux-kernel@openphoenux.org>,
        linux-omap <linux-omap@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        "open list:DRM PANEL DRIVERS" <dri-devel@lists.freedesktop.org>,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Subject: Re: [drm:simple_bridge_attach [simple_bridge]] *ERROR* Fix bridge
 driver to make connector optional!
Message-ID: <20200417124422.fl35igitvd7thpr5@gilmour.lan>
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Hi,

Cc'ing Laurent

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.
>=20
> What I see in the log is:
>=20
> [   28.567840] [drm:simple_bridge_attach [simple_bridge]] *ERROR* Fix bri=
dge driver to make connector optional!
> [   28.567871] omapdrm omapdrm.0: unable to attach bridge /ocp@68000000/d=
ss@48050000/encoder@48050c00
> [   28.786529] omapdrm omapdrm.0: omap_modeset_init failed: ret=3D-22
> [   28.841552] omapdrm: probe of omapdrm.0 failed with error -22
>=20
> 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.
>=20
> The opa362 is sitting in the video out path from
>=20
> 	omapdrm -> venc -> opa362 -> video-out-connector.
>=20
> 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 be=
t on
 something I guess it would be

https://lore.kernel.org/dri-devel/20200226112514.12455-1-laurent.pinchart@i=
deasonboard.com/

Maxime

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