[{"id":39857,"web_url":"https://patchwork.libcamera.org/comment/39857/","msgid":"<20260725154631.GE1059400@killaraus.ideasonboard.com>","date":"2026-07-25T15:46:31","subject":"Re: [PATCH v2] [RFC v2 1/1] pipeline: tegra: Add NVIDIA Tegra VI\n\tpipeline handler","submitter":{"id":2,"url":"https://patchwork.libcamera.org/api/people/2/","name":"Laurent Pinchart","email":"laurent.pinchart@ideasonboard.com"},"content":"On Sat, Jul 25, 2026 at 03:49:54PM +0200, Magdum wrote:\n> Introduce a new pipeline handler for the upstream tegra-video\n> V4L2/Media Controller driver on Jetson platforms.\n> \n> The handler builds a raw Bayer capture path from sensor -> CSI -> VI and\n> feeds frames into SoftwareISP for debayer and IPA-driven processing before\n> completing user requests.\n> \n> Key points:\n> Route raw Bayer frames from the VI engine through SoftwareISP\n> Enable SoftISP automatically in Meson when the tegra pipeline is selected\n> Handle per-frame synchronization using DelayedControls\n> Match the upstream media driver name tegra-vi\n> This keeps the implementation aligned with libcamera upstream policy by\n> targeting upstream kernel driver naming only.\n> \n> Signed-off-by: Magdum \n> \n> Changes in v2:\n> \n> Drop tegra234-vi matching\n> Match only tegra-vi\n> ---\n> Hello Laurent,\n> \n> Thanks for the review feedback on v1.\n> \n> This v2 updates the Tegra pipeline proposal to align with libcamera upstream policy: support is restricted to upstream kernel drivers only.\n> In particular, v2 removes matching for tegra234-vi and keeps discovery limited to the upstream tegra-vi media driver.\n> No downstream-only driver names are used.\n\nAs commented in a different series, please address review comments in a\nreply to the reviewer, not as note in the next version.\n\nYou haven't replied to my comment in\n20260724214259.GB1059400@killaraus.ideasonboard.com\n(\"Re: [RFC PATCH 0/1] Add NVIDIA Tegra VI pipeline handler\").\n\n> The intent of this series remains unchanged: add a Tegra VI + SoftwareISP pipeline for upstream tegra-video based platforms.\n> If a distinct Tegra234 driver is introduced upstream later, support for it will be proposed separately in a follow-up series\n> once the kernel side is in place.\n> \n> Changes in v2:\n> Drop tegra234-vi from driver matching.\n> Match only upstream tegra-vi.\n> Clarify commit message wording around upstream-only support.\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 | 1100 ++++++++++++++++++++++\n> src/libcamera/software_isp/meson.build | 2 +-\n> 5 files changed, 1108 insertions(+), 1 deletion(-)\n> create mode 100644 src/libcamera/pipeline/tegra/meson.build\n> create mode 100644 src/libcamera/pipeline/tegra/tegra.cpp\n\n[snip]","headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id AAE04C3264\n\tfor ;\n\tSat, 25 Jul 2026 15:46:35 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id B852C67F46;\n\tSat, 25 Jul 2026 17:46:34 +0200 (CEST)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 4132767E5C\n\tfor ;\n\tSat, 25 Jul 2026 17:46:33 +0200 (CEST)","from killaraus.ideasonboard.com\n\t(2001-14ba-70f3-e800--a06.rev.dnainternet.fi\n\t[IPv6:2001:14ba:70f3:e800::a06])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id 94C7C3A4;\n\tSat, 25 Jul 2026 17:45:30 +0200 (CEST)"],"Authentication-Results":"lancelot.ideasonboard.com; dkim=pass (1024-bit key;\n\tunprotected) header.d=ideasonboard.com header.i=@ideasonboard.com\n\theader.b=\"Kx+DswwV\"; dkim-atps=neutral","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1784994330;\n\tbh=Rt4Km4yKaCDk0BAZS3HxuNaQ0zQe7Y85XVffQ1/XCVo=;\n\th=Date:From:To:Cc:Subject:References:In-Reply-To:From;\n\tb=Kx+DswwVONPUgmvmjN1LWYUpqRoDSJcJ6mGwcoEeZEafFVNOvFnSD9HYWfbNDkEN2\n\tTRrYHUx7Yukiweq7WG+XaGeODkrFl//tI8kWBYxaLCQKcFKc0gMZelfuHSG5djkRHn\n\tNNRyGq0IpmuZp27UjOb+EkooLCerGzt8P32BUhOw=","Date":"Sat, 25 Jul 2026 18:46:31 +0300","From":"Laurent Pinchart ","To":"Magdum ","Cc":"libcamera-devel@lists.libcamera.org","Subject":"Re: [PATCH v2] [RFC v2 1/1] pipeline: tegra: Add NVIDIA Tegra VI\n\tpipeline handler","Message-ID":"<20260725154631.GE1059400@killaraus.ideasonboard.com>","References":"<20260724174705.9411-2-magdum.foss@gmail.com>\n\t<20260725135445.14555-1-magdum.foss@gmail.com>","MIME-Version":"1.0","Content-Type":"text/plain; charset=utf-8","Content-Disposition":"inline","In-Reply-To":"<20260725135445.14555-1-magdum.foss@gmail.com>","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "}},{"id":39858,"web_url":"https://patchwork.libcamera.org/comment/39858/","msgid":"<178499891157.2290182.15147034180518670148@ping.linuxembedded.co.uk>","date":"2026-07-25T17:01:51","subject":"Re: [PATCH v2] [RFC v2 1/1] pipeline: tegra: Add NVIDIA Tegra VI\n\tpipeline handler","submitter":{"id":4,"url":"https://patchwork.libcamera.org/api/people/4/","name":"Kieran Bingham","email":"kieran.bingham@ideasonboard.com"},"content":"Quoting Magdum (2026-07-25 14:49:54)\n> Introduce a new pipeline handler for the upstream tegra-video\n> V4L2/Media Controller driver on Jetson platforms.\n> \n> The handler builds a raw Bayer capture path from sensor -> CSI -> VI and\n> feeds frames into SoftwareISP for debayer and IPA-driven processing before\n> completing user requests.\n> \n> Key points:\n> Route raw Bayer frames from the VI engine through SoftwareISP\n> Enable SoftISP automatically in Meson when the tegra pipeline is selected\n> Handle per-frame synchronization using DelayedControls\n> Match the upstream media driver name tegra-vi\n> This keeps the implementation aligned with libcamera upstream policy by\n> targeting upstream kernel driver naming only.\n> \n> Signed-off-by: Magdum \n> \n> Changes in v2:\n> \n> Drop tegra234-vi matching\n> Match only tegra-vi\n> ---\n> Hello Laurent,\n> \n> Thanks for the review feedback on v1.\n> \n> This v2 updates the Tegra pipeline proposal to align with libcamera upstream policy: support is restricted to upstream kernel drivers only.\n> In particular, v2 removes matching for tegra234-vi and keeps discovery limited to the upstream tegra-vi media driver.\n> No downstream-only driver names are used.\n> \n> The intent of this series remains unchanged: add a Tegra VI + SoftwareISP pipeline for upstream tegra-video based platforms.\n> If a distinct Tegra234 driver is introduced upstream later, support for it will be proposed separately in a follow-up series\n> once the kernel side is in place.\n\nCould this be a one line addition to the simple pipeline handler match\ntable instead? What's the requirement for an independent pipeline\nhandler here?\n\n--\nRegards\n\nKieran","headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 14A43BE080\n\tfor ;\n\tSat, 25 Jul 2026 17:01:58 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 0C42D67F48;\n\tSat, 25 Jul 2026 19:01:57 +0200 (CEST)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 1136467E5C\n\tfor ;\n\tSat, 25 Jul 2026 19:01:55 +0200 (CEST)","from monstersaurus.ideasonboard.com\n\t(cpc89244-aztw30-2-0-cust6594.18-1.cable.virginm.net [86.31.185.195])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id 403A619C;\n\tSat, 25 Jul 2026 19:00:52 +0200 (CEST)"],"Authentication-Results":"lancelot.ideasonboard.com; dkim=pass (1024-bit key;\n\tunprotected) header.d=ideasonboard.com header.i=@ideasonboard.com\n\theader.b=\"iccz3XAb\"; dkim-atps=neutral","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1784998852;\n\tbh=7eqvhr7S2hQR7ueQFi98WC0sd5Jc/KdWPa5AQs0tcEw=;\n\th=In-Reply-To:References:Subject:From:Cc:To:Date:From;\n\tb=iccz3XAbYNAo5wLnTsfNp2DKvIQNfC2dtQFkubjzzUn5BfYfoGeE8tEOnuKDfwZFL\n\t5nzJE325SkZTMH65xvLg/pmXqWK7SKmbQHCJnktnYr1vvRiN6ZdcPp6rmRq2oCAksh\n\taG/z6SKi8Mig8RwOP9h2eWrwuYRe+uQrsRTpOz1s=","Content-Type":"text/plain; charset=\"utf-8\"","MIME-Version":"1.0","Content-Transfer-Encoding":"quoted-printable","In-Reply-To":"<20260725135445.14555-1-magdum.foss@gmail.com>","References":"<20260724174705.9411-2-magdum.foss@gmail.com>\n\t<20260725135445.14555-1-magdum.foss@gmail.com>","Subject":"Re: [PATCH v2] [RFC v2 1/1] pipeline: tegra: Add NVIDIA Tegra VI\n\tpipeline handler","From":"Kieran Bingham ","Cc":"magdum.foss@gmail.com","To":"Magdum , libcamera-devel@lists.libcamera.org","Date":"Sat, 25 Jul 2026 18:01:51 +0100","Message-ID":"<178499891157.2290182.15147034180518670148@ping.linuxembedded.co.uk>","User-Agent":"alot/0.9.1","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "}},{"id":39859,"web_url":"https://patchwork.libcamera.org/comment/39859/","msgid":"","date":"2026-07-25T22:10:10","subject":"Re: [PATCH v2] [RFC v2 1/1] pipeline: tegra: Add NVIDIA Tegra VI\n\tpipeline handler","submitter":{"id":453,"url":"https://patchwork.libcamera.org/api/people/453/","name":"Magdum","email":"magdum.foss@gmail.com"},"content":"Hello Kieran,\n\nThanks for the feedback.\n\nTo be completely transparent, when I started on Tegra support, I assumed\nevery ARM SoC needed its own dedicated src/libcamera/pipeline//\ndirector.\n\nI used SimplePipelineHandler as a template, thinking a standalone handler\nwould serve as a baseline for future platform drivers like tegra234-vi. I\nbuil it around SoftwareISP to get raw Bayer streaming working on Jetson,\nwithout realizing SimplePipelineHandler already provides that exact\nplumbing out of the box.\n\nNow that I see how cleanly SimplePipelineHandler handles soft.mojom and\nlinear media graphs for upstream drivers, adding tegra-vi to the simple\nmatch table is clearly the right, low-maintenance path forward. If\ntegra234-vi or other variants land upstream later, most probably they can\neasily be added to the match table.\n\nBest,\nMagdum\n\nOn Saturday, 25 July 2026, Kieran Bingham \nwrote:\n\n> Quoting Magdum (2026-07-25 14:49:54)\n> > Introduce a new pipeline handler for the upstream tegra-video\n> > V4L2/Media Controller driver on Jetson platforms.\n> >\n> > The handler builds a raw Bayer capture path from sensor -> CSI -> VI and\n> > feeds frames into SoftwareISP for debayer and IPA-driven processing\n> before\n> > completing user requests.\n> >\n> > Key points:\n> > Route raw Bayer frames from the VI engine through SoftwareISP\n> > Enable SoftISP automatically in Meson when the tegra pipeline is\n> selected\n> > Handle per-frame synchronization using DelayedControls\n> > Match the upstream media driver name tegra-vi\n> > This keeps the implementation aligned with libcamera upstream policy by\n> > targeting upstream kernel driver naming only.\n> >\n> > Signed-off-by: Magdum \n> >\n> > Changes in v2:\n> >\n> > Drop tegra234-vi matching\n> > Match only tegra-vi\n> > ---\n> > Hello Laurent,\n> >\n> > Thanks for the review feedback on v1.\n> >\n> > This v2 updates the Tegra pipeline proposal to align with libcamera\n> upstream policy: support is restricted to upstream kernel drivers only.\n> > In particular, v2 removes matching for tegra234-vi and keeps discovery\n> limited to the upstream tegra-vi media driver.\n> > No downstream-only driver names are used.\n> >\n> > The intent of this series remains unchanged: add a Tegra VI +\n> SoftwareISP pipeline for upstream tegra-video based platforms.\n> > If a distinct Tegra234 driver is introduced upstream later, support for\n> it will be proposed separately in a follow-up series\n> > once the kernel side is in place.\n>\n> Could this be a one line addition to the simple pipeline handler match\n> table instead? What's the requirement for an independent pipeline\n> handler here?\n>\n> --\n> Regards\n>\n> Kieran\n>","headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 65262BE080\n\tfor ;\n\tSat, 25 Jul 2026 22:10:15 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id DD30467F57;\n\tSun, 26 Jul 2026 00:10:13 +0200 (CEST)","from mail-ed1-x530.google.com (mail-ed1-x530.google.com\n\t[IPv6:2a00:1450:4864:20::530])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id D638F67F22\n\tfor ;\n\tSun, 26 Jul 2026 00:10:11 +0200 (CEST)","by mail-ed1-x530.google.com with SMTP id\n\t4fb4d7f45d1cf-69fc2261f2bso912873a12.3\n\tfor ;\n\tSat, 25 Jul 2026 15:10:11 -0700 (PDT)","by 2002:a05:7208:548a:b0:105:e888:871e with HTTP; 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