[{"id":36380,"web_url":"https://patchwork.libcamera.org/comment/36380/","msgid":"<176106016299.2256500.4139101288853991934@ping.linuxembedded.co.uk>","date":"2025-10-21T15:22:42","subject":"Re: [PATCH v1 1/1] pipeline: imx8-isi: Delay ISI routes config to\n\tacquire() time","submitter":{"id":4,"url":"https://patchwork.libcamera.org/api/people/4/","name":"Kieran Bingham","email":"kieran.bingham@ideasonboard.com"},"content":"Hi Antoine, Andrei,\n\nQuoting Antoine Bouyer (2025-10-20 13:24:00)\n> From: Andrei Gansari \n> \n> Fixes behavior when calling 'cam -l' during a live stream from a camera\n> in another process.\n> \n> Issue is that multiple process should be able to list (match procedure)\n> the camera supported. But only the unique process that lock the media\n> devices in order to be able to configure then start the pipeline should\n> setup the routes, graphs etc.\n> \n> Thus, the setRouting() is to be moved to a PipelineHandlerISI::acquireDevice()\n> implementation to override the default Pipeline::acquireDevice() function.\n\nOverall I think this is a good thing to aim for... We should definitely\nnot interfere with a running camera just from trying to list them.\n\n> Fixes: 92df79112fb2 (\"pipeline: imx8-isi: Add multicamera support\")\n\nBut I think this 'fixes' patch might be introducing bugs.\n\nPlease review below.\n\n> \n> Signed-off-by: Andrei Gansari \n> Tested-by: Antoine Bouyer \n> ---\n> src/libcamera/pipeline/imx8-isi/imx8-isi.cpp | 46 +++++++++++++++++---\n> 1 file changed, 40 insertions(+), 6 deletions(-)\n> \n> diff --git a/src/libcamera/pipeline/imx8-isi/imx8-isi.cpp b/src/libcamera/pipeline/imx8-isi/imx8-isi.cpp\n> index de09431cb9b9..26f556bbb819 100644\n> --- a/src/libcamera/pipeline/imx8-isi/imx8-isi.cpp\n> +++ b/src/libcamera/pipeline/imx8-isi/imx8-isi.cpp\n> @@ -71,6 +71,8 @@ public:\n> \n> unsigned int xbarSink_ = 0;\n> unsigned int xbarSourceOffset_ = 0;\n> +\n> + const std::string &cameraName() const { return sensor_->entity()->name(); }\n> };\n> \n> class ISICameraConfiguration : public CameraConfiguration\n> @@ -117,6 +119,9 @@ protected:\n> \n> int queueRequestDevice(Camera *camera, Request *request) override;\n> \n> + bool acquireDevice(Camera *camera) override;\n> + void releaseDevice(Camera *camera) override;\n> +\n> private:\n> static constexpr Size kPreviewSize = { 1920, 1080 };\n> static constexpr Size kMinISISize = { 1, 1 };\n> @@ -143,6 +148,10 @@ private:\n> \n> std::unique_ptr crossbar_;\n> std::vector pipes_;\n> +\n> + unsigned int acquireCount_ = 0;\n> +\n> + V4L2Subdevice::Routing routing_ = {};\n> };\n> \n> /* -----------------------------------------------------------------------------\n> @@ -950,6 +959,36 @@ int PipelineHandlerISI::queueRequestDevice(Camera *camera, Request *request)\n> return 0;\n> }\n> \n> +bool PipelineHandlerISI::acquireDevice(Camera *camera)\n> +{\n> + ISICameraData *data = cameraData(camera);\n> + int ret;\n> +\n> + acquireCount_++;\n> + LOG(ISI, Debug) << \"acquireDevice \" << data->cameraName()\n> + << \" count \" << acquireCount_;\n> +\n> + if (acquireCount_ > 1)\n> + return true;\n> +\n> + /* Enable routing for all available sensors once */\n> + ret = crossbar_->setRouting(&routing_, V4L2Subdevice::ActiveFormat);\n> + if (ret)\n> + return ret;\n\nThis function returns a bool, while setRouting returns an error number,\nso I don't think this is doing quite what you intend.\n\nAlso - if we have an error on setting the routing, should we fail to\nacquire the device, and if so - should we keep acquireCount at 0? Or do\nwe have to call releaseDevice() even if acquireDevice fails ?\n\n\n> +\n> + return true;\n> +}\n> +\n> +void PipelineHandlerISI::releaseDevice(Camera *camera)\n> +{\n> + ISICameraData *data = cameraData(camera);\n> +\n> + ASSERT(acquireCount_);\n> + acquireCount_--;\n> + LOG(ISI, Debug) << \"releaseDevice \" << data->cameraName()\n> + << \" count \" << acquireCount_;\n> +}\n> +\n> bool PipelineHandlerISI::match(DeviceEnumerator *enumerator)\n> {\n> DeviceMatch dm(\"mxc-isi\");\n> @@ -1034,7 +1073,6 @@ bool PipelineHandlerISI::match(DeviceEnumerator *enumerator)\n> unsigned int numSinks = 0;\n> const unsigned int xbarFirstSource = crossbar_->entity()->pads().size() - pipes_.size();\n> const unsigned int maxStreams = pipes_.size() / cameraCount;\n> - V4L2Subdevice::Routing routing = {};\n> \n> for (MediaPad *pad : crossbar_->entity()->pads()) {\n> unsigned int sink = numSinks;\n> @@ -1104,7 +1142,7 @@ bool PipelineHandlerISI::match(DeviceEnumerator *enumerator)\n> /* Add routes to the crossbar switch routing table. */\n> for (unsigned i = 0; i < data->streams_.size(); i++) {\n> unsigned int sourcePad = xbarFirstSource + data->xbarSourceOffset_ + i;\n> - routing.emplace_back(V4L2Subdevice::Stream{ data->xbarSink_, 0 },\n> + routing_.emplace_back(V4L2Subdevice::Stream{ data->xbarSink_, 0 },\n> V4L2Subdevice::Stream{ sourcePad, 0 },\n> V4L2_SUBDEV_ROUTE_FL_ACTIVE);\n> }\n> @@ -1116,10 +1154,6 @@ bool PipelineHandlerISI::match(DeviceEnumerator *enumerator)\n> numCameras++;\n> }\n> \n> - ret = crossbar_->setRouting(&routing, V4L2Subdevice::ActiveFormat);\n> - if (ret)\n> - return false;\n> -\n> return numCameras > 0;\n> }\n> \n> -- \n> 2.34.1\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 6B2DDC32CE\n\tfor ;\n\tTue, 21 Oct 2025 15:22:48 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 4A39D60781;\n\tTue, 21 Oct 2025 17:22:47 +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 013CF60774\n\tfor ;\n\tTue, 21 Oct 2025 17:22:45 +0200 (CEST)","from pendragon.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 6A806EB4;\n\tTue, 21 Oct 2025 17:21:02 +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=\"cvHz7qtn\"; dkim-atps=neutral","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1761060062;\n\tbh=H/hJMghwCUAXwp84Wa4y9YdNvKKseRDjsGy5xspfqc8=;\n\th=In-Reply-To:References:Subject:From:Cc:To:Date:From;\n\tb=cvHz7qtn4h+Z88GCrYFevbc6uege6+WL1iaCafetETX4eMEHD41sVM8dFSCXTg1E8\n\tEtMcjkBmCOfGdB9TB1eyanAMnUT9u3ICxeRIwYWzmoX2C3xCQ/2muJ2K4qY7V8xlnq\n\tf7017EK0PRtonTS804wxE8UK86Au4bQI+k0krb0A=","Content-Type":"text/plain; charset=\"utf-8\"","MIME-Version":"1.0","Content-Transfer-Encoding":"quoted-printable","In-Reply-To":"<20251020122400.1759110-2-antoine.bouyer@nxp.com>","References":"<20251020122400.1759110-1-antoine.bouyer@nxp.com>\n\t<20251020122400.1759110-2-antoine.bouyer@nxp.com>","Subject":"Re: [PATCH v1 1/1] pipeline: imx8-isi: Delay ISI routes config to\n\tacquire() time","From":"Kieran Bingham ","Cc":"julien.vuillaumier@nxp.com, Andrei Gansari ,\n\tAntoine Bouyer ","To":"Antoine Bouyer ,\n\tlibcamera-devel@lists.libcamera.org","Date":"Tue, 21 Oct 2025 16:22:42 +0100","Message-ID":"<176106016299.2256500.4139101288853991934@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":36384,"web_url":"https://patchwork.libcamera.org/comment/36384/","msgid":"<2ed7cb07-72ad-422d-9802-f286580c147f@nxp.com>","date":"2025-10-22T08:24:50","subject":"Re: [PATCH v1 1/1] pipeline: imx8-isi: Delay ISI routes config to\n\tacquire() time","submitter":{"id":218,"url":"https://patchwork.libcamera.org/api/people/218/","name":"Antoine Bouyer","email":"antoine.bouyer@nxp.com"},"content":"Hi Kieran\n\nThanks for feedback\n\nOn 21/10/2025 17:22, Kieran Bingham wrote:\n> Caution: This is an external email. Please take care when clicking links or opening attachments. When in doubt, report the message using the 'Report this email' button\n> \n> \n> Hi Antoine, Andrei,\n> \n> Quoting Antoine Bouyer (2025-10-20 13:24:00)\n>> From: Andrei Gansari \n>>\n>> Fixes behavior when calling 'cam -l' during a live stream from a camera\n>> in another process.\n>>\n>> Issue is that multiple process should be able to list (match procedure)\n>> the camera supported. But only the unique process that lock the media\n>> devices in order to be able to configure then start the pipeline should\n>> setup the routes, graphs etc.\n>>\n>> Thus, the setRouting() is to be moved to a PipelineHandlerISI::acquireDevice()\n>> implementation to override the default Pipeline::acquireDevice() function.\n> \n> Overall I think this is a good thing to aim for... We should definitely\n> not interfere with a running camera just from trying to list them.\n> \n>> Fixes: 92df79112fb2 (\"pipeline: imx8-isi: Add multicamera support\")\n> \n> But I think this 'fixes' patch might be introducing bugs.\n> \n> Please review below.\n> \n>>\n>> Signed-off-by: Andrei Gansari \n>> Tested-by: Antoine Bouyer \n>> ---\n>> src/libcamera/pipeline/imx8-isi/imx8-isi.cpp | 46 +++++++++++++++++---\n>> 1 file changed, 40 insertions(+), 6 deletions(-)\n>>\n>> diff --git a/src/libcamera/pipeline/imx8-isi/imx8-isi.cpp b/src/libcamera/pipeline/imx8-isi/imx8-isi.cpp\n>> index de09431cb9b9..26f556bbb819 100644\n>> --- a/src/libcamera/pipeline/imx8-isi/imx8-isi.cpp\n>> +++ b/src/libcamera/pipeline/imx8-isi/imx8-isi.cpp\n>> @@ -71,6 +71,8 @@ public:\n>>\n>> unsigned int xbarSink_ = 0;\n>> unsigned int xbarSourceOffset_ = 0;\n>> +\n>> + const std::string &cameraName() const { return sensor_->entity()->name(); }\n>> };\n>>\n>> class ISICameraConfiguration : public CameraConfiguration\n>> @@ -117,6 +119,9 @@ protected:\n>>\n>> int queueRequestDevice(Camera *camera, Request *request) override;\n>>\n>> + bool acquireDevice(Camera *camera) override;\n>> + void releaseDevice(Camera *camera) override;\n>> +\n>> private:\n>> static constexpr Size kPreviewSize = { 1920, 1080 };\n>> static constexpr Size kMinISISize = { 1, 1 };\n>> @@ -143,6 +148,10 @@ private:\n>>\n>> std::unique_ptr crossbar_;\n>> std::vector pipes_;\n>> +\n>> + unsigned int acquireCount_ = 0;\n>> +\n>> + V4L2Subdevice::Routing routing_ = {};\n>> };\n>>\n>> /* -----------------------------------------------------------------------------\n>> @@ -950,6 +959,36 @@ int PipelineHandlerISI::queueRequestDevice(Camera *camera, Request *request)\n>> return 0;\n>> }\n>>\n>> +bool PipelineHandlerISI::acquireDevice(Camera *camera)\n>> +{\n>> + ISICameraData *data = cameraData(camera);\n>> + int ret;\n>> +\n>> + acquireCount_++;\n>> + LOG(ISI, Debug) << \"acquireDevice \" << data->cameraName()\n>> + << \" count \" << acquireCount_;\n>> +\n>> + if (acquireCount_ > 1)\n>> + return true;\n>> +\n>> + /* Enable routing for all available sensors once */\n>> + ret = crossbar_->setRouting(&routing_, V4L2Subdevice::ActiveFormat);\n>> + if (ret)\n>> + return ret;\n> \n> This function returns a bool, while setRouting returns an error number,\n> so I don't think this is doing quite what you intend.\n\nohh right! Most probably cast-ed to true, which is the opposite of what \nis intended !\n\n> \n> Also - if we have an error on setting the routing, should we fail to\n> acquire the device, and if so - should we keep acquireCount at 0? Or do\n> we have to call releaseDevice() even if acquireDevice fails ?\n\nNeed to rework the logic:\n - test acquireCount_ is non null instead of > 1\n - increase counter before returning, only in case of success: i.e. \nafter setRouting without error, or if already non null.\n\nThanks\nAntoine\n\n> \n> \n>> +\n>> + return true;\n>> +}\n>> +\n>> +void PipelineHandlerISI::releaseDevice(Camera *camera)\n>> +{\n>> + ISICameraData *data = cameraData(camera);\n>> +\n>> + ASSERT(acquireCount_);\n>> + acquireCount_--;\n>> + LOG(ISI, Debug) << \"releaseDevice \" << data->cameraName()\n>> + << \" count \" << acquireCount_;\n>> +}\n>> +\n>> bool PipelineHandlerISI::match(DeviceEnumerator *enumerator)\n>> {\n>> DeviceMatch dm(\"mxc-isi\");\n>> @@ -1034,7 +1073,6 @@ bool PipelineHandlerISI::match(DeviceEnumerator *enumerator)\n>> unsigned int numSinks = 0;\n>> const unsigned int xbarFirstSource = crossbar_->entity()->pads().size() - pipes_.size();\n>> const unsigned int maxStreams = pipes_.size() / cameraCount;\n>> - V4L2Subdevice::Routing routing = {};\n>>\n>> for (MediaPad *pad : crossbar_->entity()->pads()) {\n>> unsigned int sink = numSinks;\n>> @@ -1104,7 +1142,7 @@ bool PipelineHandlerISI::match(DeviceEnumerator *enumerator)\n>> /* Add routes to the crossbar switch routing table. */\n>> for (unsigned i = 0; i < data->streams_.size(); i++) {\n>> unsigned int sourcePad = xbarFirstSource + data->xbarSourceOffset_ + i;\n>> - routing.emplace_back(V4L2Subdevice::Stream{ data->xbarSink_, 0 },\n>> + routing_.emplace_back(V4L2Subdevice::Stream{ data->xbarSink_, 0 },\n>> V4L2Subdevice::Stream{ sourcePad, 0 },\n>> V4L2_SUBDEV_ROUTE_FL_ACTIVE);\n>> }\n>> @@ -1116,10 +1154,6 @@ bool PipelineHandlerISI::match(DeviceEnumerator *enumerator)\n>> numCameras++;\n>> }\n>>\n>> - ret = crossbar_->setRouting(&routing, V4L2Subdevice::ActiveFormat);\n>> - if (ret)\n>> - return false;\n>> -\n>> return numCameras > 0;\n>> }\n>>\n>> --\n>> 2.34.1\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 EF1BBBE080\n\tfor ;\n\tWed, 22 Oct 2025 08:22:57 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 018B460793;\n\tWed, 22 Oct 2025 10:22:57 +0200 (CEST)","from GVXPR05CU001.outbound.protection.outlook.com\n\t(mail-swedencentralazlp170130007.outbound.protection.outlook.com\n\t[IPv6:2a01:111:f403:c202::7])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 61D8260793\n\tfor ;\n\tWed, 22 Oct 2025 10:22:55 +0200 (CEST)","from GVXPR04MB9831.eurprd04.prod.outlook.com (2603:10a6:150:11c::8)\n\tby VI1PR04MB7006.eurprd04.prod.outlook.com (2603:10a6:803:137::23)\n\twith Microsoft SMTP Server (version=TLS1_2,\n\tcipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9228.11;\n\tWed, 22 Oct 2025 08:22:52 +0000","from GVXPR04MB9831.eurprd04.prod.outlook.com\n\t([fe80::4634:3d9c:c4a:641a]) by\n\tGVXPR04MB9831.eurprd04.prod.outlook.com\n\t([fe80::4634:3d9c:c4a:641a%6]) with mapi id 15.20.9228.016;\n\tWed, 22 Oct 2025 08:22:52 +0000"],"Authentication-Results":["lancelot.ideasonboard.com; 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