[00/23] Add Tegra20 parallel video input capture

From: Luca Ceresoli <luca.ceresoli@bootlin.com>

Tegra20 and other Tegra SoCs have a video input (VI) peripheral that can
receive from either MIPI CSI-2 or parallel video (called respectively "CSI"
and "VIP" in the documentation). The kernel currently has a staging driver
for Tegra210 CSI capture. This patch set adds support for Tegra20 VIP
capture.

Unfortunately I had no real documentation available to base this work on,
and I started from a working downstream 3.1 kernel, that I have heavily
reworked to fit into the existing tegra-video driver. The existing code
appears written with the intent of being modular and allow adding new input
mechanisms and new SoCs while keeping a unique VI core module. However its
modularity and extensibility was not enough to add Tegra20 VIP support, so
I added some hooks to turn hard-coded behaviour into per-SoC or per-bus
customizable code. There are also some fixes, some generic cleanups and DT
bindings.

Quick tour of the patches:

 * Device tree bindings and minor DTS improvements

   01. dt-bindings: display: tegra: add bindings for Tegra20 VIP
   02. dt-bindings: display: tegra: vi: add 'vip' property and example
   03. ARM: dts: tegra20: add label to nvidia,tegra20-vi node
   04. ARM: dts: tegra20-tamonten: add label to avdd_vdac regulator

 * A fix

   05. staging: media: tegra-video: fix .vidioc_enum_fmt_vid_cap to return all formats

 * Minor improvements to logging, comments, cleanups

   06. staging: media: tegra-video: improve documentation of tegra_video_format fields
   07. staging: media: tegra-video: document tegra_channel_get_remote_source_subdev
   08. staging: media: tegra-video: fix typos in comment
   09. staging: media: tegra-video: improve error messages
   10. staging: media: tegra-video: slightly simplify cleanup on errors
   11. staging: media: tegra-video: move private struct declaration to C file
   12. staging: media: tegra-video: remove unneeded include

 * Preparation to make the VI module generic enough to host Tegra20 and VIP

   13. staging: media: tegra-video: Kconfig: allow TPG only on Tegra210
   14. staging: media: tegra-video: move tegra_channel_fmt_align to a per-soc op
   15. staging: media: tegra-video: move default format to soc-specific data
   16. staging: media: tegra-video: move MIPI calibration calls from VI to CSI
   17. staging: media: tegra-video: add a per-soc enable/disable op
   18. staging: media: tegra-video: move syncpt init/free to a per-soc op
   19. staging: media: tegra-video: add syncpts for Tegra20 to struct tegra_vi
   20. staging: media: tegra-video: add hooks for planar YUV and H/V flip
   21. staging: media: tegra-video: add H/V flip controls

 * Implementation of VIP and Tegra20

   22. staging: media: tegra-video: add support for VIP (parallel video input)
   23. staging: media: tegra-video: add tegra20 variant

Enjoy!

Luca

Luca Ceresoli (23):
  dt-bindings: display: tegra: add bindings for Tegra20 VIP
  dt-bindings: display: tegra: vi: add 'vip' property and example
  ARM: dts: tegra20: add label to nvidia,tegra20-vi node
  ARM: dts: tegra20-tamonten: add label to avdd_vdac regulator
  staging: media: tegra-video: fix .vidioc_enum_fmt_vid_cap to return
    all formats
  staging: media: tegra-video: improve documentation of
    tegra_video_format fields
  staging: media: tegra-video: document
    tegra_channel_get_remote_source_subdev
  staging: media: tegra-video: fix typos in comment
  staging: media: tegra-video: improve error messages
  staging: media: tegra-video: slightly simplify cleanup on errors
  staging: media: tegra-video: move private struct declaration to C file
  staging: media: tegra-video: remove unneeded include
  staging: media: tegra-video: Kconfig: allow TPG only on Tegra210
  staging: media: tegra-video: move tegra_channel_fmt_align to a per-soc
    op
  staging: media: tegra-video: move default format to soc-specific data
  staging: media: tegra-video: move MIPI calibration calls from VI to
    CSI
  staging: media: tegra-video: add a per-soc enable/disable op
  staging: media: tegra-video: move syncpt init/free to a per-soc op
  staging: media: tegra-video: add syncpts for Tegra20 to struct
    tegra_vi
  staging: media: tegra-video: add hooks for planar YUV and H/V flip
  staging: media: tegra-video: add H/V flip controls
  staging: media: tegra-video: add support for VIP (parallel video
    input)
  staging: media: tegra-video: add tegra20 variant

 .../display/tegra/nvidia,tegra20-vi.yaml      |  68 ++
 .../display/tegra/nvidia,tegra20-vip.yaml     |  64 ++
 MAINTAINERS                                   |  10 +
 arch/arm/boot/dts/tegra20-tamonten.dtsi       |   2 +-
 arch/arm/boot/dts/tegra20.dtsi                |   2 +-
 drivers/staging/media/tegra-video/Kconfig     |   1 +
 drivers/staging/media/tegra-video/Makefile    |   2 +
 drivers/staging/media/tegra-video/csi.c       |  44 ++
 drivers/staging/media/tegra-video/tegra20.c   | 649 ++++++++++++++++++
 drivers/staging/media/tegra-video/tegra210.c  |  97 ++-
 drivers/staging/media/tegra-video/vi.c        | 321 ++-------
 drivers/staging/media/tegra-video/vi.h        |  76 +-
 drivers/staging/media/tegra-video/video.c     |   5 +
 drivers/staging/media/tegra-video/video.h     |   2 +-
 drivers/staging/media/tegra-video/vip.c       | 298 ++++++++
 drivers/staging/media/tegra-video/vip.h       |  72 ++
 16 files changed, 1425 insertions(+), 288 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-vip.yaml
 create mode 100644 drivers/staging/media/tegra-video/tegra20.c
 create mode 100644 drivers/staging/media/tegra-video/vip.c
 create mode 100644 drivers/staging/media/tegra-video/vip.h

HI Hans,

On Thu, 24 Nov 2022 09:36:14 +0100
Hans Verkuil <hverkuil-cisco@xs4all.nl> wrote:

> Hi Luca,
> 
> On 09/11/2022 15:18, luca.ceresoli@bootlin.com wrote:
> > From: Luca Ceresoli <luca.ceresoli@bootlin.com>
> > 
> > Tegra20 and other Tegra SoCs have a video input (VI) peripheral that can
> > receive from either MIPI CSI-2 or parallel video (called respectively "CSI"
> > and "VIP" in the documentation). The kernel currently has a staging driver
> > for Tegra210 CSI capture. This patch set adds support for Tegra20 VIP
> > capture.
> > 
> > Unfortunately I had no real documentation available to base this work on,
> > and I started from a working downstream 3.1 kernel, that I have heavily
> > reworked to fit into the existing tegra-video driver. The existing code
> > appears written with the intent of being modular and allow adding new input
> > mechanisms and new SoCs while keeping a unique VI core module. However its
> > modularity and extensibility was not enough to add Tegra20 VIP support, so
> > I added some hooks to turn hard-coded behaviour into per-SoC or per-bus
> > customizable code. There are also some fixes, some generic cleanups and DT
> > bindings.  
> 
> I plan on testing this series (esp. making sure it keeps working on non-tegra210
> hardware), but I have to find time for that. This is on my TODO list, so I will
> get to it, but it might time.

Thanks for letting me know!

Indeed, with respect to what you wrote, even testing on tegra210
hardware would be useful in case you have any, as all the hardware I
can access is tegra20.

Kind regards.