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

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Date:   Fri, 17 Apr 2020 15:53:46 +0200
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Maxime Ripard <maxime@...no.tech>,
        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!

Hi Laurent,

> Am 17.04.2020 um 14:58 schrieb Laurent Pinchart <laurent.pinchart@...asonboard.com>:
> 
> 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 ?

Yes, seems to magically solve the boot issue!

I'll confirm later if the opa362 is still (or again) working.

BR and thanks,
Nikolaus Schaller