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SubjectRe: [PATCH v2 0/3] media: vimc: Allow multiple capture devices to use the same sensor
On Mon, Jul 27, 2020 at 02:54:30PM -0300, Helen Koike wrote:
> Hi,
>
> On 7/27/20 11:31 AM, Kieran Bingham wrote:
> > Hi all,
> >
> > +Dafna for the thread discussion, as she's missed from the to/cc list.
> >
> >
> > On 24/07/2020 13:21, Kaaira Gupta wrote:
> >> On Fri, Jul 24, 2020 at 02:15:21PM +0200, Niklas Söderlund wrote:
> >> Hi,
> >>
> >>> Hi Kaaira,
> >>>
> >>> Thanks for your work.
> >>
> >> Thanks for yours :D
> >>
> >>>
> >>> On 2020-07-24 17:32:10 +0530, Kaaira Gupta wrote:
> >>>> This is version 2 of the patch series posted by Niklas for allowing
> >>>> multiple streams in VIMC.
> >>>> The original series can be found here:
> >>>> https://patchwork.kernel.org/cover/10948831/
> >>>>
> >>>> This series adds support for two (or more) capture devices to be
> >>>> connected to the same sensors and run simultaneously. Each capture device
> >>>> can be started and stopped independent of each other.
> >>>>
> >>>> Patch 1/3 and 2/3 deals with solving the issues that arises once two
> >>>> capture devices can be part of the same pipeline. While 3/3 allows for
> >>>> two capture devices to be part of the same pipeline and thus allows for
> >>>> simultaneously use.
> >>>
> >>> I'm just curious if you are aware of this series? It would replace the
> >>> need for 1/3 and 2/3 of this series right?
> >>
> >> v3 of this series replaces the need for 1/3, but not the current version
> >> (ie v4). v4 of patch 2/5 removes the stream_counter that is needed to
> >> keep count of the calls to s_stream. Hence 1/3 becomes relevant again.
> >
> > So the question really is, how do we best make use of the two current
> > series, to achieve our goal of supporting multiple streams.
> >
> > Having not parsed Dafna's series yet, do we need to combine elements of
> > both ? Or should we work towards starting with this series and get
> > dafna's patches built on top ?
> >
> > Or should patch 1/3 and 3/3 of this series be on top of Dafna's v4 ?
> >
> > (It might be noteworthy to say that Kaaira has reported successful
> > multiple stream operation from /this/ series and her development branch
> > on libcamera).
>
> Dafna's patch seems still under discussion, but I don't want to block progress in Vimc either.
>
> So I was wondering if we can move forward with Vimc support for multistreaming,
> without considering Dafna's patchset, and we can do the clean up later once we solve that.
>
> What do you think?

I agree with supporting multiple streams with VIMC with this patchset,
and then we can refactor the counters for s_stream in VIMC later (over
this series) if dafna includes them in subsequent version of her patchset.

>
> Regards,
> Helen
>
> >
> >
> >>> 1. https://lore.kernel.org/linux-media/20200522075522.6190-1-dafna.hirschfeld@collabora.com/
> >>>
> >>>>
> >>>> Changes since v1:
> >>>> - All three patches rebased on latest media-tree.
> >>>> Patch 3:
> >>>> - Search for an entity with a non-NULL pipe instead of searching
> >>>> for sensor. This terminates the search at output itself.
> >>>>
> >>>> Kaaira Gupta (3):
> >>>> media: vimc: Add usage count to subdevices
> >>>> media: vimc: Serialize vimc_streamer_s_stream()
> >>>> media: vimc: Join pipeline if one already exists
> >>>>
> >>>> .../media/test-drivers/vimc/vimc-capture.c | 35 ++++++++++++++++++-
> >>>> .../media/test-drivers/vimc/vimc-debayer.c | 8 +++++
> >>>> drivers/media/test-drivers/vimc/vimc-scaler.c | 8 +++++
> >>>> drivers/media/test-drivers/vimc/vimc-sensor.c | 9 ++++-
> >>>> .../media/test-drivers/vimc/vimc-streamer.c | 23 +++++++-----
> >>>> 5 files changed, 73 insertions(+), 10 deletions(-)
> >>>>
> >>>> --
> >>>> 2.17.1
> >>>>
> >>>
> >>> --
> >>> Regards,
> >>> Niklas Söderlund
> >

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