linux-kernel - Re: [PATCH v14 1/2] drm: add kms driver for loongson display controller

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Date:   Mon, 22 May 2023 15:27:31 +0800
From:   Sui Jingfeng <15330273260@....cn>
To:     WANG Xuerui <kernel@...0n.name>, Sui Jingfeng <15330273260@....cn>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Li Yi <liyi@...ngson.cn>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian Koenig <christian.koenig@....com>,
        Emil Velikov <emil.l.velikov@...il.com>
Cc:     linaro-mm-sig@...ts.linaro.org, loongson-kernel@...ts.loongnix.cn,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Javier Martinez Canillas <javierm@...hat.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Liu Peibao <liupeibao@...ngson.cn>, linux-media@...r.kernel.org
Subject: Re: [PATCH v14 1/2] drm: add kms driver for loongson display
 controller

Hi,


I love your reviews,


On 2023/5/21 20:21, WANG Xuerui wrote:
> Hi,
>
> Someone else in a discussion group brought my attention to this 
> series, that I've neglected for a long time because 
> loongarch@...ts.linux.dev isn't on the Cc list and I'm not subscribed 
> to dri-devel.
>
> While I'm reasonably familiar with LoongArch internals and Linux in 
> general, I don't regularly tinker with the graphics things, so I'm 
> mainly focusing on the natural language usage and general code smells 
> for my reviews below. Pardon me if some of the questions seem silly.
>
> (After going through the entirety of this: *please* spell-check your 
> comment blocks, and correct obvious grammatical nits as best as you 
> can. From my first impression, although a reader not familiar with 
> LoongArch nor Chinese could go a long way in understanding this, some 
> of the rest would be misunderstood, or don't make sense at all. And 
> like 90% of the sentences are grammatically incorrect, i.e. are 
> obvious "Chinglish". Maybe something like those ChatGPT-based services 
> or someone in your company would help.)
>
OK, I didn't realize that grammar problem could up to 90%.

I'm focus on feature development previously,  I will do the grammar 
check before send the next version.

>
>
[...]
>
> On 2023/5/20 18:57, Sui Jingfeng wrote:
>> From: Sui Jingfeng <suijingfeng@...ngson.cn>
>>
>> Loongson display controller IP has been integrated in both Loongson 
>> north
>> bridge chipset(ls7a1000/ls7a2000) and Loongson 
>> SoCs(ls2k1000/ls2k2000), it
>> has been even included in Loongson self-made BMC products.
>>
>> This display controller is a PCI device. It has two display pipes and 
>> each
>> display pipe support a primary plane and a cursor plane. For the DC 
>> in the
>
> "supports"
Ok, you are correct here.
>
>> ls7a1000 and ls2k1000, each display pipe has a DVO output interface 
>> which
>> provide RGB888 signals, vertical & horizontal synchronisations and pixel
>
> "synchronisation"
>
Ok, you are correct here.
>> clock. Each CRTC is able to support 1920x1080@...z, the maximum 
>> resolution
>
> "is capable of" sounds more natural?
>
I think they are equivalent, I can't perceive the difference.
>> of each display pipe is 2048x2048 according to the hardware spec.
>>
>> For the DC in LS7A2000, each display pipe is equipped with a built-in 
>> HDMI
>> encoder which is compliant with the HDMI 1.4 specification, thus it 
>> support
>
> "supporting up to 3840x2160@...z"
>
acceptable
>> 3840x2160@...z. The first display pipe is also equipped with a 
>> transparent
>> vga encoder which is parallel with the HDMI encoder. The DC in 
>> LS7A2000 is
>
> "The first display pipe additionally has a transparent VGA encoder"?
>
The first display pipe(pipe 0) also has a transparent VGA encoder.

>> more complete compare with the one in old chips, besides above 
>> feature, it
>> has two hardware cursors, two hardware vblank counter and two scanout
>> position recorders unit. It also support tiled framebuffer format which
>> can be scanout the tiled framebuffer rendered by the LoongGPU directly.
>
> "The DC in LS7A2000 is more feature-complete compared with the older 
> revision: in addition to the above, it also has two hardware cursors, 
> two hardware vblank counters and two scanout position recorders. It 
> also supports tiled framebuffer format so the tiled output from the 
> LoongGPU can be scanned out directly."

OK, acceptable.