linux-kernel - Re: [PATCH 2/2] video: fbdev: Enable Xilinx FB for ZynqMP

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Message-ID: <994f5b9f-9ba7-ad80-84c4-de1edd9e56d0@xilinx.com>
Date:   Mon, 14 Aug 2017 15:50:56 +0200
From:   Michal Simek <michal.simek@...inx.com>
To:     Daniel Vetter <daniel.vetter@...ll.ch>,
        Michal Simek <michal.simek@...inx.com>
CC:     Linus Walleij <linus.walleij@...aro.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "monstr@...str.eu" <monstr@...str.eu>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Arnd Bergmann <arnd@...db.de>,
        "linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Paul Burton <paul.burton@...tec.com>
Subject: Re: [PATCH 2/2] video: fbdev: Enable Xilinx FB for ZynqMP

On 14.8.2017 15:49, Daniel Vetter wrote:
> On Mon, Aug 14, 2017 at 3:46 PM, Michal Simek <michal.simek@...inx.com> wrote:
>> On 14.8.2017 15:42, Linus Walleij wrote:
>>> On Tue, Aug 8, 2017 at 10:10 AM, Michal Simek <michal.simek@...inx.com> wrote:
>>>
>>>> Enable this driver for Xilinx ZynqMP.
>>>>
>>>> Signed-off-by: Michal Simek <michal.simek@...inx.com>
>>>
>>> Not a comment on the patch per se, but I would advice you to look into
>>> migrating the Xilinx frame buffer to DRI/DRM/KMS.
>>>
>>> The recent CMA helpers has made it very simple and focused to write
>>> DRM drivers. See for example drivers/gpu/drm/pl111
>>
>> There is a lot of work done by xilinx in this area gpu/drm/kms. I am
>> trying to upstream what xilinx has in soc tree and this change is there.
>> Maybe in this case it is useless and none is using it but it is there
>> and I don't want to break user. There shouldn't be any technical problem
>> to run this old fb driver in pl on arm64.
> 
> A proper drm kms driver gives you backwards compat for fbdev for free.
> And we're taking in patches to fill feature gaps in our fbdev
> emulation as people hit them. There no reason nowadays at all to merge
> new fbdev native drivers, your users will be taken care of by a drm
> kms driver fully.

You can look at xilinx work in this area.
https://github.com/Xilinx/linux-xlnx
Unfortunately they haven't started to upstream it.

In this particular case I am not aware about anybody who is going to
write new driver for this soft IP.

Thanks,
Michal