linux-kernel - Re: [PATCH v3 00/11] CSI2RX support on J721E

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Date:   Thu, 8 Jul 2021 11:43:23 +0300
From:   Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To:     Jacopo Mondi <jacopo@...ndi.org>, Pratyush Yadav <p.yadav@...com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Nikhil Devshatwar <nikhil.nd@...com>,
        Alexandre Courbot <acourbot@...omium.org>,
        Arnd Bergmann <arnd@...db.de>, Benoit Parrot <bparrot@...com>,
        Bert Vermeulen <bert@...t.com>,
        Dikshita Agarwal <dikshita@...eaurora.org>,
        Dongchun Zhu <dongchun.zhu@...iatek.com>,
        Eugen Hristev <eugen.hristev@...rochip.com>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Fabio Estevam <festevam@...il.com>,
        Georgi Djakov <georgi.djakov@...aro.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Helen Koike <helen.koike@...labora.com>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        Kieran Bingham <kieran.bingham@...asonboard.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Martina Krasteva <martinax.krasteva@...el.com>,
        Maxime Ripard <mripard@...nel.org>,
        Michael Tretter <m.tretter@...gutronix.de>,
        Mirela Rabulea <mirela.rabulea@....com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Qiushi Wu <wu000273@....edu>, Raag Jadav <raagjadav@...il.com>,
        Ricardo Ribalda <ribalda@...omium.org>,
        Rob Herring <robh+dt@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        Steve Longerbeam <slongerbeam@...il.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Tianshu Qiu <tian.shu.qiu@...el.com>,
        Yang Yingliang <yangyingliang@...wei.com>,
        Zou Wei <zou_wei@...wei.com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org
Subject: Re: [PATCH v3 00/11] CSI2RX support on J721E

On 08/07/2021 11:19, Jacopo Mondi wrote:
> Hi Tomi, Pratyush,
> 
> On Thu, Jul 08, 2021 at 12:26:38AM +0530, Pratyush Yadav wrote:
>> Hi Tomi,
>>
>> Thanks for looking into the patches.
>>
>> On 01/07/21 10:56AM, Tomi Valkeinen wrote:
>>> Hi Pratyush,
>>>
>>> On 24/06/2021 22:21, Pratyush Yadav wrote:
>>>> Hi,
>>>>
>>>> This series adds support for CSI2 capture on J721E. It includes some
>>>> fixes to the Cadence CSI2RX driver, adds runtime PM support to OV5640
>>>> driver, and finally adds the TI CSI2RX wrapper driver.
>>>>
>>>> This series used to include the DPHY and DMA engine patches as well, but
>>>> they have been split off to facilitate easier merging. Patch 3 is
>>>> build-dependent on the DPHY series [0].
>>>>
>>>> The DMA engine patch [1] can go in any order since that is only a run
>>>> time dependency. Things probably won't work without it but it will still
>>>> build fine.
>>>>
>>>> Tested on TI's J721E with OV5640 sensor.
>>>
>>> I applied these (csi-2 rx, phy, dma-engine) to linux-media/master, and added dts changes to add the csi2-rx. When sending the series, can you also push the branch you use for testing, as the posted patches do not include everything needed?
>>
>> Please use https://github.com/prati0100/linux-next/ branch "capture"
>>
>> I will include the link in the cover letter from next version onwards.
>>
>>>
>>> Here are some notes from quick tests:
>>>
>>> Capture works, but the fps is ~28.98. I would expect it to be closer to 30. Are the clocks configured correctly?
>>
>> I see this as well. I figured this had something to do with the sensor.
> 
> Tomi you might remember your patch to change the h/vtot values which I
> collected in a series which I never managed to bring to v1, as Hugues
> reported it was broken for JPEG capture.
> 
> I'll leave it here just for reference, I admit I dropped the ball
> rather quickly there:
> https://patchwork.linuxtv.org/project/linux-media/cover/20201028225706.110078-1-jacopo+renesas@jmondi.org/
> 
> I wish I could re-test but seems I've lost the powering cable of the
> device I used to test ov5640 :(

Yes, I'm still using my hack patch when working with OV5640. With that 
hack, on TI platforms with CAL IP, I get ~30fps. With this series on J7, 
I get the above mentioned 28.98.

It's possible my hack patch is wrong, and CAL driver is buggy, but 
together they make things right. I guess I should also try J7 without my 
hack patch.

If I recall right, I tested your changes but I couldn't get them to work 
on my HW.

I haven't worked on that since then, as I decided that debugging blind 
is pointless. We need someone to analyze the signals to see what OV5640 
is sending. Or some new understanding about the OV5640 HW.

  Tomi