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\n\tFri, 24 Jul 2026 10:47:09 -0700 (PDT)", "From": "Magdum <magdum.foss@gmail.com>", "To": "libcamera-devel@lists.libcamera.org", "Cc": "Magdum <magdum.foss@gmail.com>", "Subject": "[RFC PATCH 0/1] Add NVIDIA Tegra VI pipeline handler", "Date": "Fri, 24 Jul 2026 19:47:00 +0200", "Message-ID": "<20260724174705.9411-1-magdum.foss@gmail.com>", "X-Mailer": "git-send-email 2.43.0", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=UTF-8", "Content-Transfer-Encoding": "8bit", "X-BeenThere": "libcamera-devel@lists.libcamera.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "<libcamera-devel.lists.libcamera.org>", "List-Unsubscribe": "<https://lists.libcamera.org/options/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=unsubscribe>", "List-Archive": "<https://lists.libcamera.org/pipermail/libcamera-devel/>", "List-Post": "<mailto:libcamera-devel@lists.libcamera.org>", "List-Help": "<mailto:libcamera-devel-request@lists.libcamera.org?subject=help>", "List-Subscribe": "<https://lists.libcamera.org/listinfo/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=subscribe>", "Errors-To": "libcamera-devel-bounces@lists.libcamera.org", "Sender": "\"libcamera-devel\" <libcamera-devel-bounces@lists.libcamera.org>" }, "content": "***\nI have written a new libcamera pipeline handler for NVIDIA Tegra-based\nJetson boards (Nano, TX2, Xavier NX, AGX Xavier, AGX Orin). Before\nsubmitting it upstream I need real-hardware test reports.\n\nIf you have a Jetson board with a CSI camera attached and a mainline\nkernel, **your help would be greatly appreciated**.\n\n---\n\n## What this patch does\n\nAdds support for the Tegra VI (Video Input) camera pipeline to libcamera,\ncovering:\n\n- Jetson Nano / TX2 / Xavier (tegra-vi driver)\n- Jetson AGX Orin / Orin NX / Orin Nano (tegra234-vi driver)\n\nThe pipeline routes raw Bayer frames from the sensor through the CSI\nbridge into VI capture buffers, then uses libcamera's SoftwareISP to\ndebayer and apply AGC/AWB/CCM so the application receives a usable RGB\nor YUV frame.\n\n---\n\n## Prerequisites\n\n### Hardware\n- Any Jetson board (Nano / TX2 / Xavier NX / AGX Xavier / AGX Orin)\n- A CSI camera module with an upstream kernel sensor driver\n\n### Kernel\n- **Mainline kernel 6.x** (not NVIDIA's downstream BSP kernel).\n The tegra-video driver must be present and the sensor driver loaded.\n\n Verify with:\n ```bash\n # Should list a tegra-vi or tegra234-vi media device\n media-ctl -p\n\n # Should show your sensor as a V4L2 subdevice\n v4l2-ctl --list-devices\n ```\n\n### Software dependencies\n```bash\n# Ubuntu / Debian\nsudo apt install \\\n meson ninja-build pkg-config \\\n libglib2.0-dev libudev-dev libyaml-dev \\\n python3-yaml python3-ply python3-jinja2 \\\n libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev \\\n qtbase5-dev # optional, needed only for qcam GUI\n```\n\n---\n\n## Build instructions\n\n```bash\ngit clone https://git.libcamera.org/libcamera/libcamera.git\ncd libcamera\n\n# Apply the provided tegra patch\ngit am 0001-pipeline-Add-NVIDIA-Tegra-VI-pipeline-handler.patch\n\nmeson setup build \\\n -Dpipelines=tegra \\\n -Dipas=simple \\\n -Ddocumentation=disabled\n\nninja -C build\n```\n\n---\n\n## Test procedure\n\n### 1. Verify the camera is detected\n\n```bash\n./build/src/apps/cam/cam --list\n```\n\nExpected output (sensor name will vary):\n```\nAvailable cameras:\n1: /base/soc/cam0_regulator/... (imx219)\n```\n\nIf no cameras are listed, check `dmesg` for errors from `tegra-csi`,\n`tegra-vi`, or the sensor driver.\n\n---\n\n### 2. Basic capture smoke test\n\n```bash\n# Capture 30 frames, no output file — just check for errors\n./build/src/apps/cam/cam \\\n -c 1 \\\n -s width=1280,height=720,pixelformat=RGB888 \\\n --capture=30\n```\n\nExpected: no error messages, final line reports 30 frames completed.\n\n---\n\n### 3. Save frames to disk and inspect\n\n```bash\n./build/src/apps/cam/cam \\\n -c 1 \\\n -s width=1920,height=1080,pixelformat=RGB888 \\\n --capture=10 \\\n --file=/tmp/frame-#.ppm\n\n# Open a frame (any image viewer works)\neog /tmp/frame-0.ppm\n```\n\nExpected: a recognisable, correctly-coloured image of the scene. It may\nbe slightly dark or slightly over-exposed in the first few frames while\nAGC converges — that is normal.\n\n---\n\n### 4. Live preview (optional, requires Qt)\n\n```bash\n./build/src/apps/qcam/qcam\n```\n\nExpected: a live preview window showing the camera feed.\n\n---\n\n### 5. Stress / reliability test\n\n```bash\n# 20 start/stop cycles — tests cleanup and resource release\nfor i in $(seq 1 20); do\n ./build/src/apps/cam/cam \\\n -c 1 \\\n -s width=1280,height=720,pixelformat=RGB888 \\\n --capture=5\ndone\n\n# Check dmesg for warnings or errors after the run\ndmesg | grep -i \"tegra\\|csi\\|isp\\|cam\" | tail -20\n```\n\n---\n\n## What to report back\n\nPlease reply with the following information:\n\n```\nBoard: e.g. Jetson Nano 4GB / AGX Orin 32GB\nKernel: e.g. 6.8.0 mainline\nCamera: e.g. IMX219 (Raspberry Pi Camera v2)\nDriver: tegra-vi / tegra234-vi\n\nTest 1 – cam --list: PASS / FAIL\nTest 2 – 30-frame capture: PASS / FAIL\nTest 3 – PPM image quality: PASS / FAIL / (describe issues)\nTest 4 – Live preview: PASS / FAIL / SKIP\nTest 5 – Stress test: PASS / FAIL\n\ndmesg errors (if any):\n<paste relevant lines>\n\nAdditional notes:\n<anything unusual you observed>\n```\n\n---\n\n## Known limitations\n\n- Only a single output stream is supported per camera.\n- Hardware rotation/flip is not supported (Rotate0 only).\n- Hardware ISP (ISP7 on Tegra234/Orin) is not yet supported — frames are\n processed by the CPU-based SoftwareISP. This means image quality and\n CPU load will be lower and higher respectively than a hardware ISP path.\n ISP7 support will be added in a follow-up once the upstream kernel driver\n is available.\n\n---\n\n## Contact\n\nPlease send test results to the libcamera mailing list:\n**libcamera-devel@lists.libcamera.org**\n\nOr open a discussion on the libcamera GitLab:\n**https://gitlab.freedesktop.org/camera/libcamera**\n\nThank you for your time!\n***\n\nMagdum (1):\n pipeline: Add NVIDIA Tegra VI pipeline handler\n\n include/libcamera/ipa/meson.build | 1 +\n meson_options.txt | 1 +\n src/libcamera/pipeline/tegra/meson.build | 5 +\n src/libcamera/pipeline/tegra/tegra.cpp | 1102 ++++++++++++++++++++++\n src/libcamera/software_isp/meson.build | 2 +-\n 5 files changed, 1110 insertions(+), 1 deletion(-)\n create mode 100644 src/libcamera/pipeline/tegra/meson.build\n create mode 100644 src/libcamera/pipeline/tegra/tegra.cpp" }