linux-kernel - Re: [PATCHv2 00/10] Nokia N950 basic display support

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Date:   Tue, 21 Mar 2017 11:38:53 +0200
From:   Tomi Valkeinen <tomi.valkeinen@...com>
To:     Sebastian Reichel <sre@...nel.org>,
        Tony Lindgren <tony@...mide.com>,
        Aaro Koskinen <aaro.koskinen@....fi>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
CC:     David Airlie <airlied@...ux.ie>, <linux-omap@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv2 00/10] Nokia N950 basic display support

On 20/03/17 13:29, Tomi Valkeinen wrote:
> Hi,
> 
> On 05/03/17 01:50, Sebastian Reichel wrote:
>> Hi,
>>
>> Some of you may remember, that I sent a series for the N950 display
>> some time ago. N950 has command mode DSI panel, so the main part of
>> the patchset takes care of adding manual display update support in
>> omapdrm.
>>
>> The N950 also requires display rotation (the panel is mounted vertically
>> and bottom-up) and offset. The required bits will be sent separately.
>>
>> The patchset is based on 2d62e0768d3c, which is the current commit
>> torvald's master branch points to. I tested the patches on N950
>> with kernel console (fbcon), Tomi's kmstest and Xorg from Debian sid.
>>
>> Rough changelog, most of that work was done by Tony (thanks!)
>>
>>  * lots of patches dropped for now
>>  * rebased to current omapdrm interface
>>  * added OMAP4 support
>>  * misc. cleanup
> 
> I haven't been able to go through this series with time, but looking at
> the patches, there were multiple places where I felt quite uneasy with
> the changes. It didn't help that many of the patches did not have
> descriptions.
> 
> So as an RFC series, it's quite nice and shows that the manual update
> can be gotten to work. But I'm not ready to apply this until the patches
> touching the omapdrm enable, disable and commit sequences are split up
> into smaller patches with proper descriptions.

I made a quick test on my OMAP4 SDP (it has similar panel to N950), and
I did get a picture on the LCD, and kmstest --flip works. It's tearing,
though, and the fps is ~80, so apparently TE signal is not used for
synchronization here. I think nobody is calling the enable_te().

 Tomi



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