linux-kernel - [RFC PATCH 0/3] Implement Region of Interest(ROI) support.

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Message-Id: <20260113-iris_enc_roi-v1-0-6c86eba38587@oss.qualcomm.com>
Date: Tue, 13 Jan 2026 12:33:31 -0800
From: Deepa Guthyappa Madivalara <deepa.madivalara@....qualcomm.com>
To: Mauro Carvalho Chehab <mchehab@...nel.org>,
        Vikash Garodia <vikash.garodia@....qualcomm.com>,
        Dikshita Agarwal <dikshita.agarwal@....qualcomm.com>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Bryan O'Donoghue <bod@...nel.org>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        Deepa Guthyappa Madivalara <deepa.madivalara@....qualcomm.com>
Subject: [RFC PATCH 0/3] Implement Region of Interest(ROI) support.

Hi all,

This patch set implements region of interest(ROI) support
for video encoder to be configured as a rectangular
region, and corresponding delta QP parameter. A new compound
control V4L2_CID_MPEG_VIDEO_ENC_ROI which maps to struct
v4l2_ctrl_enc_roi_params is implemented to achieve this.  

I'm sharing this series as an RFC because adding support
in the firmware and framework for testing, gstreamer testing
is still in progress. I would appreciate early feedback on
the design, implementation, and fixes before moving to a
formal submission.

v4l2-ctl -d /dev/video1 --list-ctrls
..
hevc_b_frame_maximum_qp_value 0x00990b8c (int): min=1 max=51 step=1
default=51 value=51 flags=has-min-max
video_encoder_roi_params 0x00990b92 (unknown): type=284
value=unsupported payload type flags=has-payload

Thanks,
Deepa

Signed-off-by: Deepa Guthyappa Madivalara <deepa.madivalara@....qualcomm.com>
---
Deepa Guthyappa Madivalara (3):
      media: uapi: Introduce new control for video encoder ROI
      media: v4l2-core: Add support for video encoder ROI control
      media: iris: Add ROI support framework for video encoder

 .../userspace-api/media/v4l/ext-ctrls-codec.rst    |  7 +++
 drivers/media/platform/qcom/iris/iris_ctrls.c      | 54 +++++++++++++++++++++-
 drivers/media/platform/qcom/iris/iris_ctrls.h      |  1 +
 .../platform/qcom/iris/iris_platform_common.h      |  4 ++
 .../media/platform/qcom/iris/iris_platform_gen2.c  |  8 ++++
 drivers/media/v4l2-core/v4l2-ctrls-core.c          | 14 +++++-
 drivers/media/v4l2-core/v4l2-ctrls-defs.c          |  5 ++
 include/media/v4l2-ctrls.h                         |  1 +
 include/uapi/linux/v4l2-controls.h                 |  1 +
 include/uapi/linux/videodev2.h                     | 17 +++++++
 10 files changed, 110 insertions(+), 2 deletions(-)
---
base-commit: f417b7ffcbef7d76b0d8860518f50dae0e7e5eda
change-id: 20260112-iris_enc_roi-8898f9a2455f

Best regards,
-- 
Deepa Guthyappa Madivalara <deepa.madivalara@....qualcomm.com>