[PATCH v8 00/16] CSI2RX support on J721E and AM62

[Jai Luthra]

Hi,

This series adds support for CSI2 capture on J721E. It includes some
fixes to the Cadence CSI2RX driver, and adds the TI CSI2RX wrapper driver.

This is a V8 of the below V7 series,
https://lore.kernel.org/all/20230314115516.667-1-vaishnav.a@ti.com/

Since Pratyush moved out of TI, Vaishnav & I have been working on
this driver, and I will be maintaining it upstream.

J721E CSI2RX driver can also be extended to support multi-stream
capture, filtering different CSI Virtual Channels (VC) or Data Types
(DT) to different DMA channels. A WIP series based on v7 is available
for reference at https://github.com/jailuthra/linux/commits/csi_multi_wip

I will rebase the multi-stream patches on the current series (v8) and
post them as RFC in the coming weeks.

Testing logs: https://gist.github.com/jailuthra/eaeb3af3c65b67e1bc0d5db28180131d

Signed-off-by: Jai Luthra <j-luthra at ti.com>
---

Range-diff from v7 -> v8: http://0x0.st/H21u.diff

New Patches:
[01/16]	   Export v4l2_subdev_link_validate_get_format() helper
[03-04/16] Add new compatible for TI-specific SoC intergration of the
           Cadence CSI2RX bridge IP
[14/16]    Add support for RAW8 and RAW10 formats in Cadence CSI2RX

For [07/16] media: cadence: csi2rx: Add get_fmt and set_fmt pad ops:
- Use active subdev state to use v4l2_subdev_get_fmt
- Propagate formats from sink to source pads
- Drop Laurent's R-by because of the above changes

For [08/16] media: cadence: csi2rx: Configure DPHY using link freq:
- Drop original patch in-lieu of already merged
  https://lore.kernel.org/linux-media/20230523085626.3295-5-jack.zhu@starfivetech.com/
- Add a new patch to configure DPHY using link_freq control from the
  source

For [10/16] media: cadence: csi2rx: Set the STOP bit when stopping a stream:
- Fix bug where intention was to wait till stream status is idle, i.e.
  STREAM_STATUS[31] -> 0 - but we were instead checking the opposite

For [15/16] media: dt-bindings: Add DT bindings for TI J721E CSI2RX driver:
- Drop "Device Tree Bindings" from title
- Rename "Wrapper" to "Shim" in title as that is the name referred in
  the TRM and other places
- Update maintainer to myself
- Drop items from compatible as only a single element is present
- Rename compatible to "ti,j721e-csi2rx-shim" to distinguish from the
  SoC-specific CSI2RX bridge compatible

For [16/16] media: ti: Add CSI2RX support for J721E:
- Move after dt-bindings to keep the series bisectable
- Rename compatible to "ti,j721e-csi2rx-shim" to distinguish from the
  SoC-specific CSI2RX bridge compatible
- Make myself the Maintainer
- Support RAW8 and RAW10 formats, and setting the pixel-unwrap size on
  SHIM (RAW10 is stored in 16-bit containers, while RAW8 in 8-bit containers)
- Fix enum_fmt_vid_cap() to respect CAP_IO_MC and only list pixelformats
  matching the mbus formats set on the subdev.
- Fix enum_framesizes() to stop enumerating more than a single framesize
  (reject non-zero fsize->index)
- Simplify notifier bound fucntion to use v4l2_create_fwnode_links_to_pad()
  and inline the video_register() method
- Add support for draining the DMA with an extra buffer, to get rid of
  stale data in the pipeline on stream stop (or when frames start
  getting dropped due to load)
- Queue all available buffers to DMAEngine in the callback, also use a
  separate "submitted" queue to track all buffers submitted to DMA
- Use video_device_pipeline_start() instead of media_pipeline_start()
- Drop support for VB_READ
- Print issues in link validation as DEBUG instead of ERROR
- s/async_subdev/async_connection

For [v7 13/13] media: dt-bindings: Convert Cadence CSI2RX binding to YAML:
 - Drop patch in-lieu of
   https://lore.kernel.org/linux-media/20230523085626.3295-2-jack.zhu@starfivetech.com/

---
Jai Luthra (4):
      media: subdev: Export get_format helper for link validation
      media: dt-bindings: cadence-csi2rx: Add TI compatible string
      media: cadence: Add support for TI SoCs
      media: cadence: csi2rx: Support RAW8 and RAW10 formats

Pratyush Yadav (12):
      media: dt-bindings: Make sure items in data-lanes are unique
      media: cadence: csi2rx: Unregister v4l2 async notifier
      media: cadence: csi2rx: Cleanup media entity properly
      media: cadence: csi2rx: Add get_fmt and set_fmt pad ops
      media: cadence: csi2rx: Configure DPHY using link freq
      media: cadence: csi2rx: Soft reset the streams before starting capture
      media: cadence: csi2rx: Set the STOP bit when stopping a stream
      media: cadence: csi2rx: Fix stream data configuration
      media: cadence: csi2rx: Populate subdev devnode
      media: cadence: csi2rx: Add link validation
      media: dt-bindings: Add TI J721E CSI2RX
      media: ti: Add CSI2RX support for J721E

 .../devicetree/bindings/media/cdns,csi2rx.yaml     |    1 +
 .../bindings/media/ti,j721e-csi2rx-shim.yaml       |  100 ++
 .../bindings/media/video-interfaces.yaml           |    1 +
 MAINTAINERS                                        |    7 +
 drivers/media/platform/cadence/cdns-csi2rx.c       |  217 +++-
 drivers/media/platform/ti/Kconfig                  |   12 +
 drivers/media/platform/ti/Makefile                 |    1 +
 drivers/media/platform/ti/j721e-csi2rx/Makefile    |    2 +
 .../media/platform/ti/j721e-csi2rx/j721e-csi2rx.c  | 1127 ++++++++++++++++++++
 drivers/media/v4l2-core/v4l2-subdev.c              |    8 +-
 include/media/v4l2-subdev.h                        |   12 +
 11 files changed, 1478 insertions(+), 10 deletions(-)
---
base-commit: ec89391563792edd11d138a853901bce76d11f44
change-id: 20230727-upstream_csi-acbeabe038d8

Best regards,
-- 
Jai Luthra <j-luthra at ti.com>