[PATCH v4 0/2] media: nxp: imx8-isi: Add virtual channel and frame descriptor support

[Guoniu Zhou]

This patch series enhances the i.MX ISI driver's with virtual channel
support and adds frame descriptor capabilities to the crossbar subdevice.

Signed-off-by: Guoniu Zhou <guoniu.zhou at nxp.com>
---
Changes in v4:
- Rebase to latest media/next(previous dependency now in mainline)
- Fix VC boundary check: use num_vc (virtual channels count) instead of
  num_channels (ISI pipelines count)
- Set VC to 0 when frame descriptor has no entries
- Move platform-specific comments to block style to fix line length warnings
- Use %d instead of %u for ret variable in error messages
- Fix potential -ENOIOCTLCMD leak by resetting ret to 0 on continue
- See each patch's changelog for details
- Link to v3: https://lore.kernel.org/r/20260328-isi_vc-v3-0-a03b9a6fe117@oss.nxp.com

Changes in v3:
- Rebased on latest media/next
- Add num_vc field to platform data to indicate VC support
- Clear VC_ID_1 bit after reading CHNL_CTRL for proper VC switching
- Set VC_ID_1 only on platforms with num_vc > 4
- Improve mxc_isi_get_vc() error handling
- Add back CHNL_CTRL_BLANK_PXL and document platform-specific register fields
- Add xbar get_frame_desc() implementation (feedback from Laurent Pinchart)
- Link to v2: https://lore.kernel.org/r/20260310-isi_vc-v2-1-acbf77db8e6f@nxp.com

Changes in v2:
- Add Rb tag from Frank Li
- Fix typo in comment(s/support/supports/)
- Update commit log to include more details about ISI virtual channel support
  on different platform
- Include bitfield.h file to fix following build error
  drivers/media/platform/nxp/imx8-isi/imx8-isi-regs.h:23:65: error: implicit declaration of function ‘FIELD_PREP’ [-Wimplicit-function-declaration]
- Link to v1: https://lore.kernel.org/r/20260309-isi_vc-v1-1-fd0b8035d1cd@nxp.com

Changes in v1:
- Depends on https://lore.kernel.org/linux-media/20251105-isi_imx95-v3-2-3987533cca1c@nxp.com/

---
Guoniu Zhou (1):
      media: nxp: imx8-isi: Add virtual channel support

Guoniu.zhou (1):
      media: nxp: imx8-isi: Implement get_frame_desc for crossbar subdev

 .../media/platform/nxp/imx8-isi/imx8-isi-core.c    |  3 +
 .../media/platform/nxp/imx8-isi/imx8-isi-core.h    |  4 +
 .../platform/nxp/imx8-isi/imx8-isi-crossbar.c      | 98 ++++++++++++++++++++++
 drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c  | 14 +++-
 .../media/platform/nxp/imx8-isi/imx8-isi-pipe.c    | 59 +++++++++++++
 .../media/platform/nxp/imx8-isi/imx8-isi-regs.h    | 12 ++-
 6 files changed, 186 insertions(+), 4 deletions(-)
---
base-commit: 2c8fe1f14240d75f2002e16b2b69c5c2d27ed41c
change-id: 20260309-isi_vc-285fd815140e

Best regards,
-- 
Guoniu Zhou <guoniu.zhou at oss.nxp.com>