Hi Yunfei,

Thanks for the patch.

On Sun, 21 Jun 2020 at 22:55, Yunfei Dong [off-list ref] wrote:

User driver need to get HDR10+ information for each capture buffer;
For some encoder cases, user driver need to get encoded message for
each frame. So add support read-only(Ro) request for capture queue.

Ro request mean that user driver just can get ext ctrls, set ext ctrls
is not not allowed. Ro Request also can be used in output queue.

There is not upstream driver to use this feature at now, but we are
developing internal driver to use it. If it is ready, we will try to
upstream vdec/venc driver based on this feature.

An upstream driver using the feature would be important, but it would
be nice to also have: an open-source userspace application,
and a proper explanation in the stateless decoder interface specification.

Thanks,
Ezequiel

Change compared to v1:
-change commit message of patch 01/02
-change commit message of patch 02/02

Yunfei Dong (2):
  media: v4l UAPI: add V4L2_BUF_CAP_SUPPORTS_RO_REQUESTS
  media: v4l: Add Ro request api for capture queue

 .../media/v4l/vidioc-reqbufs.rst              |   4 +
 .../media/common/videobuf2/videobuf2-v4l2.c   |   7 ++
 drivers/media/mc/mc-request.c                 |  10 +-
 drivers/media/v4l2-core/v4l2-ctrls.c          | 107 +++++++++++++++---
 drivers/media/v4l2-core/v4l2-ioctl.c          |  22 ++++
 drivers/media/v4l2-core/v4l2-mem2mem.c        |  19 ++--
 include/media/v4l2-ctrls.h                    |  22 +++-
 include/media/v4l2-fh.h                       |   2 +
 include/media/videobuf2-core.h                |   2 +
 include/uapi/linux/videodev2.h                |   1 +
 10 files changed, 158 insertions(+), 38 deletions(-)

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel