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R. Silva" , Bjorn Andersson , Konrad Dybcio , Bryan O'Donoghue , Abel Vesa Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-hardening@vger.kernel.org, Hans de Goede X-Mailer: b4 0.14.2 X-Proofpoint-Spam-Info: AW1haW4tMjYxMTAzMDA4MCBTYWx0ZWRfXyQugowrYlQLg wLCdXId/NNe9+f5msCzikDVCAFXG06kI9g1EISzW9uRCjaWLf/cVUSELfB4yTd46DLNKaSMHoSs 22Vi/3lTTn9++l6nLQPnYz2ZNobTWS0= X-Authority-Analysis: v=2.4 cv=JeUpPkKV c=1 sm=1 tr=0 ts=6aea3ea9 cx=c_pps a=5HAIKLe1ejAbszaTRHs9Ug==:117 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=zJRp6_cAMcgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=rJkE3RaqiGZ5pbrm-msn:22 a=EUspDBNiAAAA:8 a=VwQbUJbxAAAA:8 a=Nff7jVtaK1xTle8F27sA:9 a=QEXdDO2ut3YA:10 a=gYDTvv6II1OnSo0itH1n:22 X-Proofpoint-GUID: OZg6KOz148pjmlCBawc8gh915DOKogB_ X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTAzMDA4MCBTYWx0ZWRfX8PNhHgk/Iijo fN8ikSuilGVWiEg+jdHJ8BrlIGNr8t2O3JvEfw7qZBla/+3qnho0g1g/F4mzx4dH7AxoS2rrBkI lcFHNKRkzxo0eh+2n30YYN7GfcCX6k8hDcs9MQsn1Kn5Vbpd9dMRFHCqLq1W4s0OuxjUQBRYyUH 4duSwiGYW9ex6fGoMuQey7dzAOYCwl3XymNUVt+Xw/cpuyaEUXIsTueuFNesrikiEyy/wcDqIa7 naaOv4rapZ31oNDprZr2MgxrgsI1uQjEpyLzFAAbOU4F134HR2GKGLBD++1FszgI6T7tanBbRm0 tqH8+QPFbeuod7VsH3pYmB08QRrhkH0LQd/AY6oqp+YOICSVZqRypWF/AaHaHXr7nhbWSqoP3Kn /SXFIiRnXr5L7epLFfd8p3rRMVD2O8h+QdZgS9J8YkkQ7gp12MM4e2GPGUVQid9mHSiBgulsD9p LAR8VH+ctEAGkkHOSNA== X-Proofpoint-ORIG-GUID: OZg6KOz148pjmlCBawc8gh915DOKogB_ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-11-03_04,2026-11-03_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 clxscore=1015 suspectscore=0 priorityscore=1501 bulkscore=0 spamscore=0 adultscore=0 lowpriorityscore=0 phishscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610300000 definitions=main-2611030080 Add documentation for the Qualcomm CAMSS ISP parameters metadata format (V4L2_META_FMT_QCOM_ISP_PARAMS). The format is built on the V4L2 extensible ISP parameters system, with per-block structs defined in the qcom-camss-config.h uAPI header, and is designed to be shared by any CAMSS ISP engine exposing a parameters metadata output video node. The Offline Processing Engine (OPE) ope_params node is the first consumer, with additional engines expected to add their own parameter blocks in the future. Reviewed-by: Hans de Goede Signed-off-by: Loic Poulain --- .../userspace-api/media/v4l/meta-formats.rst | 1 + .../userspace-api/media/v4l/metafmt-qcom-isp.rst | 147 +++++++++++++++++++++ MAINTAINERS | 1 + 3 files changed, 149 insertions(+) diff --git a/Documentation/userspace-api/media/v4l/meta-formats.rst b/Documentation/userspace-api/media/v4l/meta-formats.rst index b5455229837e707c24e134438d5e2fd12cb3bf37..25b46af4d9f7faab37000076c530e9aad5b4a076 100644 --- a/Documentation/userspace-api/media/v4l/meta-formats.rst +++ b/Documentation/userspace-api/media/v4l/meta-formats.rst @@ -20,6 +20,7 @@ These formats are used for the :ref:`metadata` interface only. metafmt-intel-ipu3 metafmt-pisp-be metafmt-pisp-fe + metafmt-qcom-isp metafmt-rkisp1 metafmt-rppx1 metafmt-uvc diff --git a/Documentation/userspace-api/media/v4l/metafmt-qcom-isp.rst b/Documentation/userspace-api/media/v4l/metafmt-qcom-isp.rst new file mode 100644 index 0000000000000000000000000000000000000000..da0dd9b0884ea8b3c5fba7b5aa2eb1af80418cae --- /dev/null +++ b/Documentation/userspace-api/media/v4l/metafmt-qcom-isp.rst @@ -0,0 +1,147 @@ +.. SPDX-License-Identifier: GPL-2.0 +.. c:namespace:: V4L + +.. _v4l2-meta-fmt-qcom-isp-params: + +************************************** +V4L2_META_FMT_QCOM_ISP_PARAMS ('QCIP') +************************************** + +Configuration Parameters +======================== + +The ``V4L2_META_FMT_QCOM_ISP_PARAMS`` format carries image processing +configuration for the ISP engines found in the Qualcomm Camera Subsystem +(CAMSS). It is passed to a metadata output video node using the +:c:type:`v4l2_meta_format` interface. + +Rather than a single struct containing sub-structs for each configurable area +of the ISP, parameters use the :ref:`v4l2-isp` parameters system, through which +groups of parameters are defined as distinct structs or "blocks" which may be +added to the data member of :c:type:`v4l2_isp_buffer`. Userspace is +responsible for populating the data member with the blocks that need to be +configured by the driver. Each block-specific struct embeds +:c:type:`v4l2_isp_block_header` as its first member and userspace must +populate the type member with a value from :c:type:`camss_params_block_type`. +Populated blocks must be placed consecutively in the data member, and the +combined size of all populated blocks must be set in the data_size member of +:c:type:`v4l2_isp_buffer`. + +The set of supported blocks depends on the CAMSS engine consuming the buffer. +The block definitions themselves are shared across CAMSS ISPs; currently the +Offline Processing Engine (OPE) is the only engine consuming them, through its +``ope_params`` metadata output video node. Additional engines and blocks may be +added to this format in the future. + +A block carrying ``V4L2_ISP_PARAMS_FL_BLOCK_DISABLE`` bypasses the +corresponding hardware module. Any other block updates the module's +configuration and leaves it enabled. Blocks omitted from a buffer keep their +previously programmed configuration and enable state; until userspace submits +a block for a given module, the driver's default configuration applies. + +OPE processing pipeline +======================= + +The OPE is a memory-to-memory engine that reads a Bayer RAW frame from its +``ope_input`` node and writes a YUV frame to its ``ope_disp_output`` node. The +parameter blocks configure fixed-function hardware modules that the frame data +passes through, in the following order: + +.. code-block:: none + + Bayer RAW in RGB domain YUV domain YUV out + (8/10-bit) +------+ +------+ +------+ +------+ +------+ +------+ (NV12/NV16/ + ----------> | WB |-->| DEMO |-->| CC |-->| GLUT |-->|CHROMA|-->| DSC |-----------> + +------+ +------+ +------+ +------+ |ENHAN | +------+ NV24/GREY) + +------+ + +The stages, and the parameter block that configures each one, are: + +.. flat-table:: OPE pipeline stages + :header-rows: 1 + :stub-columns: 0 + + * - Stage + - Module + - Parameter block + - Function + * - WB + - CLC_WB + - :c:type:`camss_params_wb_gain` + - Per-channel white balance gains and black-level / pedestal offsets, + applied to the raw Bayer data. + * - DEMO + - CLC_DEMO + - *(none)* + - Demosaic: reconstructs a full-resolution RGB image from the Bayer + mosaic. Always enabled; not configurable through this format. + * - CC + - CLC_CC + - :c:type:`camss_params_color_correct` + - Color correction matrix applied in the RGB domain. + * - GLUT + - CLC_GLUT + - :c:type:`camss_params_gamma` + - Per-channel gamma correction curves (256-entry LUTs). + * - CHROMA_ENHAN + - CLC_CHROMA_ENHAN + - :c:type:`camss_params_chroma_enhan` + - RGB to YUV color transfer matrix. + * - DSC + - Downscaler + - *(none)* + - Chroma (and, when required, luma) downscaling to produce the requested + YUV subsampling, e.g. YUV 4:4:4 to 4:2:2 (NV16) or 4:2:0 (NV12). + +The input node accepts 8-bit and 10-bit packed Bayer RAW formats (for example +``V4L2_PIX_FMT_SRGGB8`` and ``V4L2_PIX_FMT_SRGGB10P``). The output node +produces semi-planar YUV (``V4L2_PIX_FMT_NV12`` / ``NV21`` / ``NV16`` / +``NV61`` / ``NV24`` / ``NV42``) or luma-only ``V4L2_PIX_FMT_GREY``. A +configurable stage is bypassed while its block carries +``V4L2_ISP_PARAMS_FL_BLOCK_DISABLE``. + +The following example populates an OPE parameters buffer with a white balance +and a gamma correction block: + +.. code-block:: c + + struct v4l2_isp_buffer *params = + (struct v4l2_isp_buffer *)buffer; + + params->version = V4L2_ISP_VERSION_V1; + params->data_size = sizeof(struct camss_params_wb_gain) + + sizeof(struct camss_params_gamma); + + __u8 *data = params->data; + + struct camss_params_wb_gain *wb = + (struct camss_params_wb_gain *)data; + + memset(wb, 0, sizeof(*wb)); + wb->header.type = CAMSS_PARAMS_WB_GAIN; + wb->header.flags = V4L2_ISP_PARAMS_FL_BLOCK_ENABLE; + wb->header.size = sizeof(struct camss_params_wb_gain); + + /* Unity gain on all three channels (15uQ10, 1024 = 1.0) */ + wb->g_gain = 1024; + wb->b_gain = 1024; + wb->r_gain = 1024; + + data += sizeof(struct camss_params_wb_gain); + + struct camss_params_gamma *gamma = + (struct camss_params_gamma *)data; + + memset(gamma, 0, sizeof(*gamma)); + gamma->header.type = CAMSS_PARAMS_GAMMA; + gamma->header.flags = V4L2_ISP_PARAMS_FL_BLOCK_ENABLE; + gamma->header.size = sizeof(struct camss_params_gamma); + + /* Identity curve (pass-through, gamma 1.0) */ + for (unsigned int i = 0; i < CAMSS_GAMMA_LUT_SIZE; i++) + gamma->glut[i] = gamma->blut[i] = gamma->rlut[i] = i; + +Qualcomm CAMSS ISP uAPI data types +================================== + +.. kernel-doc:: include/uapi/linux/qcom-camss-config.h diff --git a/MAINTAINERS b/MAINTAINERS index e4ca41cdd8729625fe2f731cd443bdd4da527dca..234c4c69dec7e7264763f1970438c22d0cec11a1 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -22908,6 +22908,7 @@ L: linux-media@vger.kernel.org S: Maintained F: Documentation/admin-guide/media/qcom_camss.rst F: Documentation/devicetree/bindings/media/qcom,*camss* +F: Documentation/userspace-api/media/v4l/metafmt-qcom-isp.rst F: drivers/media/platform/qcom/camss/ QUALCOMM CLOCK DRIVERS -- 2.34.1