linux-kernel - Re: [REGRESSION] omapdrm/N900 display broken

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Date:   Fri, 27 Nov 2020 17:37:35 +0200
From:   Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>
To:     Tomi Valkeinen <tomi.valkeinen@...com>
Cc:     Aaro Koskinen <aaro.koskinen@....fi>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        ML dri-devel <dri-devel@...ts.freedesktop.org>,
        Tony Lindgren <tony@...mide.com>, linux-omap@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [REGRESSION] omapdrm/N900 display broken

Hi,

On 27.11.20 г. 15:10 ч., Ivaylo Dimitrov wrote:
> 
> 
> On 27.11.20 г. 13:45 ч., Tomi Valkeinen wrote:
>> On 27/11/2020 01:17, Ivaylo Dimitrov wrote:
>>> Hi Tomi,
>>>
>>> On 26.11.20 г. 16:11 ч., Tomi Valkeinen wrote:
>>>> Hi Aaro, Ivaylo,
>>>>
>>>> On 24/11/2020 23:03, Ivaylo Dimitrov wrote:
>>>>
>>>>> Is there any progress on the issue? I tried 5.9.1 and still nothing 
>>>>> displayed.
>>>>
>>>> Can you test the attached patch?
>>>>
>>>
>>> With this patch I don't see oops that Aaro reported, so:
>>>
>>> Tested-by: Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>
>>>
>>> Seems to fix the particular issue, however, now we get another oops. 
>>> As this is not upstream kernel
>>> but one with PVR related patches, I will try again with vanilla 5.9.
>>>
>>> Just in case oops rings any bells (the line in question is
>>> https://github.com/maemo-leste/droid4-linux/blob/maemo-5.9/drivers/gpu/drm/omapdrm/omap_gem.c#L801) 
>>>
>>
>> Do the PVR patches touch omapdrm? The call stack looks like normal 
>> boot time probing stuff, not
>> something happening later (possibly from PVR).
>>
> 
> pvr driver is not even enabled in that particular config, however, I see 
> "HACK: drm/omap: Add omapdrm plugin API" patch in the tree that touches 
> omap-gem.c, I don't really want to just create some noise for problems 
> that are created by out-of-tree patches. And yeah, it looks like a 
> normal boot time probing stuff. As soon as I have some spare time 
> (hopefully later today) I will try vanilla 5.9.x with 
> omap2plus_defconfig and will report.
> 

With 5.9.11 and the patch on top, n900 boots fine, albeit display 
remains blank, could be related to brightness, we're still investigating.

Thanks and regards,
Ivo