linux-kernel - Re: [PATCH v6 1/3] drm/lsdc: add drm driver for loongson display controller

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Date:   Fri, 3 Feb 2023 11:25:44 +0800
From:   suijingfeng <suijingfeng@...ngson.cn>
To:     Maxime Ripard <maxime@...no.tech>,
        Jiaxun Yang <jiaxun.yang@...goat.com>
Cc:     Sui Jingfeng <15330273260@....cn>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Roland Scheidegger <sroland@...are.com>,
        Zack Rusin <zackr@...are.com>,
        Christian Gmeiner <christian.gmeiner@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Andrey Zhizhikin <andrey.zhizhikin@...ca-geosystems.com>,
        Sam Ravnborg <sam@...nborg.org>, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Randy Dunlap <rdunlap@...radead.org>
Subject: Re: [PATCH v6 1/3] drm/lsdc: add drm driver for loongson display
 controller


On 2022/2/9 22:04, Maxime Ripard wrote:
> On Wed, Feb 09, 2022 at 11:56:48AM +0000, Jiaxun Yang wrote:
>>
>> 在 2022/2/9 8:52, Maxime Ripard 写道:
>>> On Thu, Feb 03, 2022 at 11:47:16PM +0800, Sui Jingfeng wrote:
>> [...]
>>> DT isn't really a solution either. Let's take the distribution
>>> perspective there. Suppose you're a Fedora or Debian developer, and want
>>> to make a single kernel image, and ship a DT to the user for their board
>>> without any modification. How is either the Kconfig solution or DT flags
>>> solution any good there? It doesn't help them at all.
>> We are working in another way. As we can tell model of the board by strings
>> passed from the firmware, we just built-in all poosible DTs into the kernel
>> and then tell which DT to load at boot time. So we can ensure users has
>> smmoth experience.
> It's not really for you to say though. Once your driver is in a release,
> distros are going to use it. That's the whole point of you asking us to
> merge it.
>
> Maxime

Hi, Dear Maxime

There are still some LS3a5000+ls7a2000 and LS3a5000+ls7a1000 boards at 
china market.

ls7a2000 has loongson display controller + loongson self-made GPU 
integrated. Without

a display driver, integrated graphics of the board can not be used with 
upstream kernel.

A few ordinary player and user space developer blaming  me, they need a 
basic usable

graphic environment  badly. Do you have spare time to review my patch 
again,

The DC is lack of document  even though in Chinese because the hardware 
engineer don't supply one.

But I will provide more information required during code review as far 
as i can tell.


https://patchwork.kernel.org/project/dri-devel/patch/20230201170403.167665-1-15330273260@189.cn/ 



Thanks for your kindness and your valuable  time .