linux-kernel - Re: [PATCH v3 0/9] media: vimc: Multiple stream support in vimc

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Message-ID: <3e374418-0ea1-783a-3943-0a0921d40725@ideasonboard.com>
Date:   Wed, 2 Sep 2020 11:51:59 +0100
From:   Kieran Bingham <kieran.bingham@...asonboard.com>
To:     Kaaira Gupta <kgupta@...iitr.ac.in>,
        Helen Koike <helen.koike@...labora.com>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/9] media: vimc: Multiple stream support in vimc

Hi Kaaira,

Thank you for this series.

I have tested it, and indeed it works well, which is great work.
I know this has been hard to debug some of the code paths!

There are a few bits that are hard for me to understand, with the graph
walking/initialisation - so I think either some better comments or
refactoring might help there - and Dafna has suggested that there might
be a useful helper which will assist too. That needs to be checked
though, as I think your 'streamer' needs to have full visibility of the
whole pipeline, rather than just a single stream.

I wonder if it would help to rename it to make that clearer, as
'vimc_stream' sounds like it deals with only a single stream - but now
it deals with multiple - so the naming is a bit confusing.

--
Kieran

On 19/08/2020 19:04, Kaaira Gupta wrote:
> This series adds supoort for two (or more) capture devices to be 
> connected to the same sensors and run simultaneously.
> 
> Changes since v2:
> 	- This series introduces new patches, namely patch 1, 2, 4, 5,
> 	  7, and 9 to shift multiple captures to operate at a single
> 	  thread.
> 
> Kaaira Gupta (7):
>   media: vimc: Move get_source_entity to vimc-common
>   media: vimc: Add get_frame callback
>   media: vimc: Separate starting stream from pipeline initialisation
>   media: vimc: Separate closing of stream and thread
>   media: vimc: Dynamically allocate stream struct
>   media: vimc: Join pipeline if one already exists
>   media: vimc: Run multiple captures on same thread
> 
> Niklas Söderlund (2):
>   media: vimc: Add usage count to subdevices
>   media: vimc: Serialize vimc_streamer_s_stream()
> 
>  .../media/test-drivers/vimc/vimc-capture.c    |  42 +++-
>  drivers/media/test-drivers/vimc/vimc-common.c |  14 ++
>  drivers/media/test-drivers/vimc/vimc-common.h |  21 +-
>  .../media/test-drivers/vimc/vimc-debayer.c    |  26 ++-
>  drivers/media/test-drivers/vimc/vimc-scaler.c |  25 +-
>  drivers/media/test-drivers/vimc/vimc-sensor.c |  17 +-
>  .../media/test-drivers/vimc/vimc-streamer.c   | 213 ++++++++++++------
>  .../media/test-drivers/vimc/vimc-streamer.h   |   2 +
>  8 files changed, 271 insertions(+), 89 deletions(-)
> 

-- 
Regards
--
Kieran