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Date:   Tue, 22 Nov 2022 00:16:25 +0200
From:   Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To:     Umang Jain <umang.jain@ideasonboard.com>
Cc:     linux-media@vger.kernel.org, kernel-list@raspberrypi.com,
        linux-kernel@vger.kernel.org, linux-rpi-kernel@lists.infradead.org,
        linux-arm-kernel@lists.infradead.org,
        linux-staging@lists.linux.dev,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@broadcom.com>,
        Dave Stevenson <dave.stevenson@raspberrypi.com>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Naushir Patuck <naush@raspberrypi.com>,
        David Plowman <david.plowman@raspberrypi.com>,
        Kieran Bingham <kieran.bingham@ideasonboard.com>
Subject: Re: [PATCH 00/14] staging: vc04_services: bcm2835-isp support
Message-ID: <Y3v4uZuhZTve2UI5@pendragon.ideasonboard.com>
References: <20221121214722.22563-1-umang.jain@ideasonboard.com>
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In-Reply-To: <20221121214722.22563-1-umang.jain@ideasonboard.com>
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Hi Umang,

Nice to see this series on the list !

On Tue, Nov 22, 2022 at 03:17:08AM +0530, Umang Jain wrote:
> This series aims to upport bcm2835-isp from the RPi kernel [1] and is a
> independent subset of earlier series [2] posted to upport CSI-2/CCP2
> receiver IP core("Unicam) + the ISP driver found in BCM283x and compatible
> SoCs (namely BCM2711). Unicam is still under active development to work
> with multistream support to get into mainline. Hence only the ISP driver
> will remain the primary area of this series.
> 
> Patch (01-02)/14  adds a new driver named vc-sm-cma to handle memory sharing
> with the VC4 VPU. 
> 
> Patch 03/14 adds a small extension to videobuf2 to allow exporting as a
> dma_buf instead of a file-descriptor.
> 
> Patch (04-05)/14 adds a couple of improvements/support for
> bcm2835-isp(event callback and zero-copy) to vchiq-mmal.
> 
> Patch (06-09)/14 adds the core bcm2835-isp driver along with headers
> and format defintions.
> 
> Patch (10-11)/14 deals with the colorspace support.
> Note: This is still WIP since the implementation of colorspace is still
> getting ironed out (especially around setting of colorspace flags handling).
> 
> Patch 12/14 allows multiple instances of the ISP.
> 
> Patch 13/14 adds a admin-guide document on bcm2835-isp.
> 
> Patch 14/14 wires all this up with the vchiq-mmal driver.
> 
> Testing:
> Tested with RPi Model 4B running linux mainline v6.1-rc6. To test
> end-to-end, I choose to cherry-pick the Unicam patches and OV5647 DT
> bindings from [1]). Once done, functional testing was conducted with
> libcamera[3] and its utility tools.
> 
> Also note: Reviews given on [2] for the relevant ISP driver patches have
> been incorporated in this version.
> 
> Known issues:
> - Colorspace handling 

This will require further discussions, I'll try to comment on this topic
in the review of the ISP driver patch.

> - vc-sm-cma spamming kernel log with
> 	- pr_err("%s: Expecting an uncached alias for dma_addr %pad\n"

Do you have any plan to address this ? Is the root cause known ?

> [1]: https://github.com/raspberrypi/linux
> [2]: https://lore.kernel.org/linux-media/20200504092611.9798-1-laurent.pinchart@ideasonboard.com/
> [3]: https://libcamera.org/getting-started.html
> 
> Dave Stevenson (7):
>   staging: vc04_services: Add new vc-sm-cma driver
>   staging: vchiq_arm: Register vcsm-cma as a platform driver
>   media: videobuf2: Allow exporting of a struct dmabuf
>   staging: mmal-vchiq: Add support for event callbacks
>   staging: mmal-vchiq: Use vc-sm-cma to support zero copy
>   staging: mmal_vchiq: Add image formats to be used by bcm2835-isp
>   uapi: bcm2835-isp: Add bcm2835-isp uapi header file
> 
> David Plowman (2):
>   vc04_services: bcm2835-isp: Allow formats with different colour spaces
>   vc04_services: bcm2835-isp: Permit all sRGB colour spaces on ISP
>     outputs
> 
> Naushir Patuck (5):
>   media: uapi: v4l2-core: Add ISP statistics output V4L2 fourcc type
>   staging: vc04_services: bcm2835-isp: Add a more complex ISP processing
>     component
>   staging: vc04_services: bcm2835_isp: Allow multiple users
>   docs: admin-guide: media: bcm2835-isp: Add documentation for
>     bcm2835-isp
>   staging: vc04_services: vchiq: Load bcm2835_isp driver from vchiq
> 
>  .../admin-guide/media/bcm2835-isp.rst         |  127 ++
>  .../userspace-api/media/drivers/index.rst     |    1 +
>  .../userspace-api/media/v4l/meta-formats.rst  |    1 +
>  .../v4l/pixfmt-meta-bcm2835-isp-stats.rst     |   41 +
>  MAINTAINERS                                   |    9 +
>  .../media/common/videobuf2/videobuf2-core.c   |   36 +-
>  drivers/media/v4l2-core/v4l2-ioctl.c          |    1 +
>  drivers/staging/vc04_services/Kconfig         |    4 +
>  drivers/staging/vc04_services/Makefile        |    2 +
>  .../staging/vc04_services/bcm2835-isp/Kconfig |   14 +
>  .../vc04_services/bcm2835-isp/Makefile        |    8 +
>  .../bcm2835-isp/bcm2835-isp-ctrls.h           |   72 +
>  .../bcm2835-isp/bcm2835-isp-fmts.h            |  558 +++++
>  .../bcm2835-isp/bcm2835-v4l2-isp.c            | 1817 +++++++++++++++++
>  .../interface/vchiq_arm/vchiq_arm.c           |    6 +
>  .../staging/vc04_services/vc-sm-cma/Kconfig   |   10 +
>  .../staging/vc04_services/vc-sm-cma/Makefile  |   12 +
>  .../staging/vc04_services/vc-sm-cma/vc_sm.c   |  801 ++++++++
>  .../staging/vc04_services/vc-sm-cma/vc_sm.h   |   54 +
>  .../vc04_services/vc-sm-cma/vc_sm_cma_vchi.c  |  507 +++++
>  .../vc04_services/vc-sm-cma/vc_sm_cma_vchi.h  |   63 +
>  .../vc04_services/vc-sm-cma/vc_sm_defs.h      |  187 ++
>  .../vc04_services/vc-sm-cma/vc_sm_knl.h       |   28 +
>  .../staging/vc04_services/vchiq-mmal/Kconfig  |    1 +
>  .../vc04_services/vchiq-mmal/mmal-common.h    |    5 +
>  .../vc04_services/vchiq-mmal/mmal-encodings.h |   66 +
>  .../vc04_services/vchiq-mmal/mmal-msg.h       |   35 +
>  .../vchiq-mmal/mmal-parameters.h              |  165 +-
>  .../vc04_services/vchiq-mmal/mmal-vchiq.c     |  253 ++-
>  .../vc04_services/vchiq-mmal/mmal-vchiq.h     |    5 +
>  include/media/videobuf2-core.h                |   15 +
>  include/uapi/linux/bcm2835-isp.h              |  347 ++++
>  include/uapi/linux/v4l2-controls.h            |    6 +
>  include/uapi/linux/videodev2.h                |    1 +
>  34 files changed, 5225 insertions(+), 33 deletions(-)
>  create mode 100644 Documentation/admin-guide/media/bcm2835-isp.rst
>  create mode 100644 Documentation/userspace-api/media/v4l/pixfmt-meta-bcm2835-isp-stats.rst
>  create mode 100644 drivers/staging/vc04_services/bcm2835-isp/Kconfig
>  create mode 100644 drivers/staging/vc04_services/bcm2835-isp/Makefile
>  create mode 100644 drivers/staging/vc04_services/bcm2835-isp/bcm2835-isp-ctrls.h
>  create mode 100644 drivers/staging/vc04_services/bcm2835-isp/bcm2835-isp-fmts.h
>  create mode 100644 drivers/staging/vc04_services/bcm2835-isp/bcm2835-v4l2-isp.c
>  create mode 100644 drivers/staging/vc04_services/vc-sm-cma/Kconfig
>  create mode 100644 drivers/staging/vc04_services/vc-sm-cma/Makefile
>  create mode 100644 drivers/staging/vc04_services/vc-sm-cma/vc_sm.c
>  create mode 100644 drivers/staging/vc04_services/vc-sm-cma/vc_sm.h
>  create mode 100644 drivers/staging/vc04_services/vc-sm-cma/vc_sm_cma_vchi.c
>  create mode 100644 drivers/staging/vc04_services/vc-sm-cma/vc_sm_cma_vchi.h
>  create mode 100644 drivers/staging/vc04_services/vc-sm-cma/vc_sm_defs.h
>  create mode 100644 drivers/staging/vc04_services/vc-sm-cma/vc_sm_knl.h
>  create mode 100644 include/uapi/linux/bcm2835-isp.h

-- 
Regards,

Laurent Pinchart