linux-kernel - Re: [PATCH 0/4] Add V4L2_PIX_FMT_MT21C format for MT8173 codec driver

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Message-ID: <64676168-8c5f-3720-820a-17e7bdbcc735@xs4all.nl>
Date:   Thu, 8 Sep 2016 11:27:17 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Tiffany Lin <tiffany.lin@...iatek.com>,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>
Cc:     Hans Verkuil <hans.verkuil@...co.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@....samsung.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Daniel Kurtz <djkurtz@...omium.org>,
        Pawel Osciak <posciak@...omium.org>,
        Eddie Huang <eddie.huang@...iatek.com>,
        Yingjoe Chen <yingjoe.chen@...iatek.com>,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 0/4] Add V4L2_PIX_FMT_MT21C format for MT8173 codec driver

On 09/08/16 11:11, Tiffany Lin wrote:
> Hi Hans,
>
> On Thu, 2016-09-08 at 09:21 +0200, Hans Verkuil wrote:
>> Hi Tiffany,
>>
>> On 09/07/2016 08:56 AM, Tiffany Lin wrote:
>>> This patch series add Mediatek compressed block format V4L2_PIX_FMT_MT21C, the
>>> decoder driver will decoded bitstream to V4L2_PIX_FMT_MT21C format.
>>>
>>> User space applications could use MT8173 MDP driver to convert V4L2_PIX_FMT_MT21C to
>>> V4L2_PIX_FMT_NV12M, V4L2_PIX_FMT_YUV420M and V4L2_PIX_FMT_YVU420.
>>>
>>> MDP driver[1] is stand alone driver.
>>>
>>> Usage:
>>> MT21C -> MT8173 MDP -> NV12M/YUV420M/YVU420
>>> NV12M/NV21M/YUV420M/YVU420M -> mt8173 Encoder -> H264/VP8
>>> H264/VP8/VP9 -> mtk8173 Decoder -> MT21C
>>>
>>> When encode with MT21 source, the pipeline will be:
>>> MT21C -> MDP driver-> NV12M/NV21M/YUV420M/YVU420M -> Encoder -> H264/VP8
>>>
>>> When playback, the pipeline will be:
>>> H264/VP8/VP9 -> Decoder driver -> MT21C -> MDP Driver -> DRM
>>>
>>> [1]https://patchwork.kernel.org/patch/9305329/
>>>
>>> Tiffany Lin (4):
>>>   v4l: add Mediatek compressed video block format
>>>   docs-rst: Add compressed video formats used on MT8173 codec driver
>>>   vcodec: mediatek: Add V4L2_PIX_FMT_MT21C support for v4l2 decoder
>>>   arm64: dts: mediatek: Add Video Decoder for MT8173
>>>
>>>  Documentation/media/uapi/v4l/pixfmt-reserved.rst   |    6 +++
>>>  arch/arm64/boot/dts/mediatek/mt8173.dtsi           |   44 ++++++++++++++++++++
>>>  drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c |    7 +++-
>>>  drivers/media/v4l2-core/v4l2-ioctl.c               |    1 +
>>>  include/uapi/linux/videodev2.h                     |    1 +
>>>  5 files changed, 58 insertions(+), 1 deletion(-)
>>>
>>
>> So basically the video decoder is useless without support for this format and
>> without the MDP driver, right?
>>
> Yes. It also require new vpu firmware.
> Andrew will help release new vpu firmware include encode/decode/mdp
> capability.

OK, then I'll park this until:

- the MT21C patch series is OK
- the MDP patch series is OK
- the new firmware is released

For the record: the decoder patch series is OK as far as I am concerned.
It's in my mtkdec branch.

Regards,

	Hans