[PATCH v2 00/13] media: cadence,ti: CSI2RX Multistream Support

[Jai Luthra <j-luthra@ti.com>]

This series adds multi-stream support for Cadence CSI2RX and TI CSI2RX
Shim drivers.

PATCH 1:	Runtime Power Management for Cadence CSI2RX
PATCH 2-7:	Support multiple DMA contexts/video nodes in TI CSI2RX
PATCH 8-9:	Use get_frame_desc to propagate virtual channel information
		across Cadence and TI CSI-RX subdevs
PATCH 10-12:	Use new multi-stream APIs across the drivers to support
		multiplexed cameras from sources like UB960 (FPDLink)
PATCH 13:	Optimize stream on by submitting all queued buffers to DMA

This applies on top of today's linux-next (next-20240626)
(also tested rebase with media_stage.git master)

Signed-off-by: Jai Luthra <j-luthra@ti.com>
---
Changes in v2:

- Change the multi-camera capture architecture to be similar to that of
  Tomi's RPi5 FE series, where the driver will wait for userspace to
  start streaming on all "actively routed" video nodes before starting
  streaming on the source. This simplifies things a lot from the HW
  perspective, which might run into deadlocks due to a shared FIFO
  between multiple DMA channels.

- Drop a few fixes that were posted separately and are already merged
- Fix dtschema warnings reported by Rob on [02/13]
- Fix warnings for uninitialized `used_vc` variable in cdns-csi2rx.c
- Return -EBUSY if someone updates routes for j721e-csi2rx subdev while
  streaming
- Only allow single-streams to be routed to the source pads (linked to
  video nodes) of the j721e-csi2rx device
- Squash the patches marked "SQUASH" in the v1 RFC series

- Link to RFC (v1):
  https://lore.kernel.org/r/20240222-multistream-v1-0-1837ed916eeb@ti.com

---
Jai Luthra (8):
      dt-bindings: media: ti,j721e-csi2rx-shim: Support 32 dma chans
      media: ti: j721e-csi2rx: separate out device and context
      media: ti: j721e-csi2rx: add a subdev for the core device
      media: ti: j721e-csi2rx: add support for processing virtual channels
      media: cadence: csi2rx: Use new enable stream APIs
      media: cadence: csi2rx: Enable multi-stream support
      media: ti: j721e-csi2rx: add multistream support
      media: ti: j721e-csi2rx: Submit all available buffers

Jayshri Pawar (1):
      media: cadence: csi2rx: Support runtime PM

Pratyush Yadav (4):
      media: ti: j721e-csi2rx: prepare SHIM code for multiple contexts
      media: ti: j721e-csi2rx: allocate DMA channel based on context index
      media: ti: j721e-csi2rx: get number of contexts from device tree
      media: cadence: csi2rx: add get_frame_desc wrapper

 .../bindings/media/ti,j721e-csi2rx-shim.yaml       |  39 +-
 drivers/media/platform/cadence/cdns-csi2rx.c       | 440 +++++++++--
 .../media/platform/ti/j721e-csi2rx/j721e-csi2rx.c  | 879 ++++++++++++++++-----
 3 files changed, 1071 insertions(+), 287 deletions(-)
---
base-commit: df9574a57d02b265322e77fb8628d4d33641dda9
change-id: 20240221-multistream-fbba6ffe47a3

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