linux-kernel - Re: [PATCH v25 4/4] media: platform: mtk-mdp3: add MediaTek MDP3 driver

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Date:   Thu, 18 Aug 2022 13:02:23 +0200
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     Moudy Ho <moudy.ho@...iatek.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Rob Landley <rob@...dley.net>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Alexandre Courbot <acourbot@...omium.org>, tfiga@...omium.org,
        drinkcat@...omium.org, pihsun@...omium.org, hsinyi@...gle.com,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        cellopoint.kai@...il.com, Ping-Hsun Wu <ping-hsun.wu@...iatek.com>,
        daoyuan huang <daoyuan.huang@...iatek.com>
Subject: Re: [PATCH v25 4/4] media: platform: mtk-mdp3: add MediaTek MDP3
 driver

Hi Moudy,

I noticed one more thing (and it is probably better to post a v26 after all):

On 17/08/2022 11:56, Moudy Ho wrote:
> This patch adds driver for MediaTek's Media Data Path ver.3 (MDP3).
> It provides the following functions:
>   color transform, format conversion, resize, crop, rotate, flip
>   and additional image quality enhancement.
> 
> The MDP3 driver is mainly used for Google Chromebook products to
> import the new architecture to set the HW settings as shown below:
>   User -> V4L2 framework
>     -> MDP3 driver -> SCP (setting calculations)
>       -> MDP3 driver -> CMDQ (GCE driver) -> HW
> 
> Each modules' related operation control is sited in mtk-mdp3-comp.c
> Each modules' register table is defined in file with "mdp_reg_" prefix
> GCE related API, operation control  sited in mtk-mdp3-cmdq.c
> V4L2 m2m device functions are implemented in mtk-mdp3-m2m.c
> Probe, power, suspend/resume, system level functions are defined in
> mtk-mdp3-core.c
> 
> v4l2-compliance 1.22.1, 32 bits, 32-bit time_t

First of all, the v4l2-compliance output belongs to the cover letter, not
to a commit log for a patch.

More importantly, I can tell that v4l2-compliance was a prepackaged version,
but you need to compile it from the git repo yourself:

git clone git://linuxtv.org/v4l-utils.git
cd v4l-utils
./bootstrap.sh
./configure
make
sudo make install

Running v4l2-compliance should start with this (or something close):

v4l2-compliance 1.23.0-4941, 64 bits, 64-bit time_t
v4l2-compliance SHA: 71112d214762 2022-07-28 15:31:13

I need to see the SHA to confirm that you tested with a sufficiently new
v4l2-compliance version. Prepackaged v4l2-compliance binaries tend to
be too old, at least for the purpose of compliance checking a new driver.

Regards,

	Hans

> Compliance test for mtk-mdp3 device /dev/video0:
> Driver Info:
> 	Driver name      : mtk-mdp3
> 	Card type        : MediaTek MDP3
> 	Bus info         : platform:14001000.mdp3-rdma0
> 	Driver version   : 6.0.0
> 	Capabilities     : 0x84204000
> 		Video Memory-to-Memory Multiplanar
> 		Streaming
> 		Extended Pix Format
> 		Device Capabilities
> 	Device Caps      : 0x04204000
> 		Video Memory-to-Memory Multiplanar
> 		Streaming
> 		Extended Pix Format