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

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Message-ID: <20200912104922.GG5022@kaaira-HP-Pavilion-Notebook>
Date:   Sat, 12 Sep 2020 16:19:22 +0530
From:   Kaaira Gupta <kgupta@...iitr.ac.in>
To:     Kieran Bingham <kieran.bingham@...asonboard.com>
Cc:     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

On Wed, Sep 02, 2020 at 11:51:59AM +0100, Kieran Bingham wrote:
> 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!

Thanks for testing and helping! :D

> 
> 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.

Hm, I too think that the name is confusing and doesn't show the correct
context..is vimc_streamer_referance a better name? What name do you
suggest?

Thanks, 
Kaaira

> 
> --
> 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