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

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Date:   Fri, 19 Aug 2022 15:42:29 +0800
From:   Bo-Chen Chen <rex-bc.chen@...iatek.com>
To:     Hans Verkuil <hverkuil-cisco@...all.nl>,
        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

On Thu, 2022-08-18 at 13:02 +0200, Hans Verkuil wrote:
> 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
> 

Hello Hans,

Because there are some issues for Moudy's mail account, I help him
reply the mail:

Thanks for your review and comment, those two errors you mentioned have
been corrected accordingly.

I will test it with the latest version of v4l2-compliance, and it will
be released in v26 together with the testing report.

BRs,
Bo-Chen

> > 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
> 
>