Re: [PATCH 00/14] staging: vc04_services: bcm2835-isp support

Laurent Pinchart
2022-11-21T22:16:43Z

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