linux-kernel - Re: [PATCH v5 0/9] Add MT8173 Video Decoder Driver

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Message-ID: <9ebe9d2e-58ad-62f3-48e8-0fcb8a3beddf@xs4all.nl>
Date:   Mon, 5 Sep 2016 13:32:33 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Tiffany Lin <tiffany.lin@...iatek.com>
Cc:     daniel.thompson@...aro.org, Rob Herring <robh+dt@...nel.org>,
        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>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, PoChun.Lin@...iatek.com
Subject: Re: [PATCH v5 0/9] Add MT8173 Video Decoder Driver

On 09/05/2016 01:30 PM, Tiffany Lin wrote:
> Hi Hans,
> 
> On Mon, 2016-09-05 at 13:26 +0200, Hans Verkuil wrote:
>> On 09/05/2016 12:52 PM, Tiffany Lin wrote:
>>> Hi Hans,
>>>
>>> On Mon, 2016-09-05 at 12:09 +0200, Hans Verkuil wrote:
>>>> On 09/05/2016 11:53 AM, Hans Verkuil wrote:
>>>>> On 09/05/2016 11:50 AM, Tiffany Lin wrote:
>>>>>> Hi Hans,
>>>>>>
>>>>>> On Mon, 2016-09-05 at 11:33 +0200, Hans Verkuil wrote:
>>>>>>> On 09/02/2016 02:19 PM, Tiffany Lin wrote:
>>>>>>>> ==============
>>>>>>>>  Introduction
>>>>>>>> ==============
>>>>>>>>
>>>>>>>> The purpose of this series is to add the driver for video codec hw embedded in the Mediatek's MT8173 SoCs.
>>>>>>>> Mediatek Video Codec is able to handle video decoding and encoding of in a range of formats.
>>>>>>>>
>>>>>>>> This patch series rely on MTK VPU driver that have been merged in v4.8-rc1.
>>>>>>>> Mediatek Video Decoder driver rely on VPU driver to load, communicate with VPU.
>>>>>>>>
>>>>>>>> Internally the driver uses videobuf2 framework, and MTK IOMMU and MTK SMI both have been merged in v4.6-rc1.
>>>>>>>>
>>>>>>>> [1]https://chromium-review.googlesource.com/#/c/245241/
>>>>>>>
>>>>>>> This patch series fails to apply to the media_tree master (patch 3/9). Can you rebase and repost?
>>>>>>>
>>>>>>> I'm ready to make a pull request for this, so I hope you can fix this soon.
>>>>>>>
>>>>>> I saw Encoder fix patches in fixes branch.
>>>>>> This patch series is base on Encoder fix patches. 
>>>>>>
>>>>>> [media] vcodec:mediatek: Refine VP8 encoder driver
>>>>>> [media] vcodec:mediatek: Refine H264 encoder driver
>>>>>> [media] vcodec:mediatek: change H264 profile default to profile high
>>>>>> [media] vcodec:mediatek: Add timestamp and timecode copy for V4L2
>>>>>> Encoder
>>>>>> [media] vcodec:mediatek: Fix visible_height larger than coded_height
>>>>>> issue in s_fmt_out
>>>>>> [media] vcodec:mediatek: Fix fops_vcodec_release flow for V4L2 Encoder
>>>>>> [media] vcodec:mediatek:code refine for v4l2 Encoder driver
>>>>>> [media] dvb_frontend: Use memdup_user() rather than duplicating its
>>>>>> implementation
>>>>>>
>>>>>>
>>>>>> If I do not rebase decoder patch series base on Encoder fix pathces.
>>>>>> Then it will fail after Encoder fix patches merged.
>>>>>>
>>>>>> May I know what parent patch I need to rebase to to fix this issue?
>>>>>
>>>>> Ah, OK. I will retest placing this on top of those fixes. I forgot about the
>>>>> pending fixes. I'll handle this.
>>>>
>>>> OK, that works much better when it is on top of the fixes.
>>>>
>>>> Only one thing is missing: an entry in the MAINTAINERS file. Strange that that
>>>> wasn't done for the encoder driver, we must have missed that. So can you make a
>>>> patch adding the en/decoder driver to this file? I'm ready to make the pull
>>>> request once I have that.
>>>>
>>> Got it. I will check and update it.
>>>
>>> I have a question about decoder device node.
>>> In v5 decoder patch series, I do not add device node patch at end of
>>> patch series.
>>> I plain to put it in MT21C format patch series, is it ok?
>>
>> What is the reason for not adding it in the decoder patch series?
>>
> 
> It is because our decoder HW only support MT21C format.

Good reason :-)

OK, that's fine.

Regards,

	Hans