[PATCH v3 0/4] Add Qualcomm JPEG V4L2 encoder for SM8250

[Atanas Filipov]

This series adds support for the Qualcomm JPEG V4L2 mem2mem encoder on SM8250.

The goal is to upstream a standards-based JPEG encode path using the V4L2 M2M
framework, with DT-described hardware resources and SoC DTS integration.

The JPEG encoder is part of the Camera SubSystem (CAMSS) and is described as a
child node of the CAMSS block, allowing of_platform_populate() in camss_probe()
to register and probe it automatically.

Dependencies:
- Patch 1/4 is related to bod's work queued in patchwork:
  https://patchwork.linuxtv.org/project/linux-media/patch/20260326-b4-linux-next-25-03-13-dtsi-x1e80100-camss-v11-4-5b93415be6dd@xxxxxxxxxx/

Supported compatibles:
- qcom,sm8250-jenc

Driver scope and design choices:
- uses the standard V4L2 mem2mem + vb2 workflow
- maps runtime resources from DT (clocks/interconnects/iommu/etc.)

Functional validation (hardware):
- platform: Kona / SM8250 / qcom,sm8250-jenc / RB5
- tested with v4l2-ctl and GStreamer (v4l2jpegenc):
  - single-frame encode: 8192x8192 NV12
  - single-frame encode: 1920x1080 NV12
  - single-frame encode: 1920x1080 GREY
  - GStreamer NV12 pipeline to JPEG files
  - GStreamer GRAY8 pipeline to MJPEG output
- V4L2 compliance test (v4l2-compliance) passed

Changes since v2:

  Binding (dt-bindings: media: qcom,jpeg-encoder):
  - IOMMU stream IDs documented in binding description. (bod)
  - Dropped "Properties documented:" section from commit message. (krzk)
  - Dropped clocks minItems constraint. (krzk)
  - Renamed clock-names to match hardware signal names. (krzk)
  - Renamed interconnect-names to reflect path topology. (krzk, Dmitry)

  DTS (arm64: dts: qcom: sm8250):
  - Removed cell-index; use lowercase hex, no 0x0 padding. (Dmitry)
  - Moved jpeg-encoder node into the camss block as a child node. (bod)
  - MMCX power domain not added to jpeg-encoder; on SM8250 MMCX is
    voted by camcc, not by individual IP blocks. (bod, kept as-is)

  CAMSS (media: qcom: camss):
  - Added of_platform_populate() in camss_probe() to register child
    platform devices; no conflicts with existing CAMSS resource
    management observed. (bod)

  Driver (media: qcom: jpeg):
  - Sort obj-y entries alphabetically in qcom/Makefile. (krzk)
  - Use devm_mutex_init() instead of mutex_init(). (Frank Li)
  - Check return value of devm_mutex_init(). (Frank Li)
  - Kept return value check on dma_set_mask_and_coherent(); consistent
    with upstream media driver practice. (Frank Li, kept as-is)

Known limitations:
- scaling is not supported
- width and height must be aligned to 16 pixels

Atanas Filipov (4):
  media: qcom: camss: populate child platform devices
  dt-bindings: media: qcom: Add JPEG encoder binding
  arm64: dts: qcom: sm8250: Add JPEG encoder node
  media: qcom: jpeg: Add Qualcomm JPEG V4L2 encoder

 .../bindings/media/qcom,jpeg-encoder.yaml     |  160 ++
 arch/arm64/boot/dts/qcom/sm8250.dtsi          |   78 +-
 drivers/media/platform/qcom/Kconfig           |    1 +
 drivers/media/platform/qcom/Makefile          |    1 +
 drivers/media/platform/qcom/camss/camss.c     |    4 +
 drivers/media/platform/qcom/jpeg/Kconfig      |   17 +
 drivers/media/platform/qcom/jpeg/Makefile     |    9 +
 .../media/platform/qcom/jpeg/qcom_jenc_defs.h |  310 ++++
 .../media/platform/qcom/jpeg/qcom_jenc_dev.c  |  337 ++++
 .../media/platform/qcom/jpeg/qcom_jenc_dev.h  |  111 ++
 .../media/platform/qcom/jpeg/qcom_jenc_hdr.c  |  354 ++++
 .../media/platform/qcom/jpeg/qcom_jenc_hdr.h  |  119 ++
 .../media/platform/qcom/jpeg/qcom_jenc_ops.c  | 1524 +++++++++++++++++
 .../media/platform/qcom/jpeg/qcom_jenc_ops.h  |   52 +
 .../media/platform/qcom/jpeg/qcom_jenc_res.c  |   39 +
 .../media/platform/qcom/jpeg/qcom_jenc_res.h  |   30 +
 .../qcom/jpeg/qcom_jenc_v420_hw_info.h        |  527 ++++++
 .../media/platform/qcom/jpeg/qcom_jenc_v4l2.c | 1150 +++++++++++++
 .../media/platform/qcom/jpeg/qcom_jenc_v4l2.h |   25 +
 19 files changed, 4844 insertions(+), 4 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/media/qcom,jpeg-encoder.yaml
 create mode 100644 drivers/media/platform/qcom/jpeg/Kconfig
 create mode 100644 drivers/media/platform/qcom/jpeg/Makefile
 create mode 100644 drivers/media/platform/qcom/jpeg/qcom_jenc_defs.h
 create mode 100644 drivers/media/platform/qcom/jpeg/qcom_jenc_dev.c
 create mode 100644 drivers/media/platform/qcom/jpeg/qcom_jenc_dev.h
 create mode 100644 drivers/media/platform/qcom/jpeg/qcom_jenc_hdr.c
 create mode 100644 drivers/media/platform/qcom/jpeg/qcom_jenc_hdr.h
 create mode 100644 drivers/media/platform/qcom/jpeg/qcom_jenc_ops.c
 create mode 100644 drivers/media/platform/qcom/jpeg/qcom_jenc_ops.h
 create mode 100644 drivers/media/platform/qcom/jpeg/qcom_jenc_res.c
 create mode 100644 drivers/media/platform/qcom/jpeg/qcom_jenc_res.h
 create mode 100644 drivers/media/platform/qcom/jpeg/qcom_jenc_v420_hw_info.h
 create mode 100644 drivers/media/platform/qcom/jpeg/qcom_jenc_v4l2.c
 create mode 100644 drivers/media/platform/qcom/jpeg/qcom_jenc_v4l2.h


base-commit: 8d6dbbbe3ba62de0a63e962ee004afb848c8e3ac
-- 
2.34.1